Show debug logs in authentication (#325 )

go mod tidy
Build(deps): bump github.com/int128/oauth2cli from 1.11.0 to 1.12.1 (#324 )
2026-02-27 23:43:49 +00:00 · 2020-07-14 09:50:02 +09:00 · 2020-07-14 09:14:51 +09:00 · 2020-07-14 07:06:48 +09:00 · 2020-07-05 19:50:26 +09:00 · 2020-07-03 09:08:57 +09:00
101 changed files with 2726 additions and 2166 deletions
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -1,27 +1,60 @@
-version: 2
+version: 2.1
+
 jobs:
-  build:
+  test:
    docker:
-      - image: circleci/golang:1.13.4
+      - image: cimg/go:1.14.4
    steps:
-      - run: mkdir -p ~/bin
-      - run: echo 'export PATH="$HOME/bin:$PATH"' >> $BASH_ENV
+      - run: curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b $(go env GOPATH)/bin v1.24.0
      - checkout
-      - run: make ci-setup-linux-amd64
-      - run: make VERSION=$CIRCLE_TAG ci
-      - run: |
-          if [ "$CIRCLE_TAG" ]; then
-            make VERSION=$CIRCLE_TAG GITHUB_USERNAME=$CIRCLE_PROJECT_USERNAME GITHUB_REPONAME=$CIRCLE_PROJECT_REPONAME release
-          fi
+      - restore_cache:
+          keys:
+            - go-sum-{{ checksum "go.sum" }}
+      - run: make check
+      - run: bash <(curl -s https://codecov.io/bash)
+      - save_cache:
+          key: go-sum-{{ checksum "go.sum" }}
+          paths:
+            - ~/go/pkg
      - store_artifacts:
          path: gotest.log

+  crossbuild:
+    macos:
+      xcode: 11.5.0
+    steps:
+      - run: |
+          curl -sSfL https://dl.google.com/go/go1.14.4.darwin-amd64.tar.gz | tar -C /tmp -xz
+          echo 'export PATH="$PATH:/tmp/go/bin:$HOME/go/bin"' >> $BASH_ENV
+      - checkout
+      - restore_cache:
+          keys:
+            - go-macos-{{ checksum "go.sum" }}
+      - run:
+          command: go get -v github.com/int128/goxzst github.com/int128/ghcp
+          working_directory: .circleci
+      - run: make dist
+      - run: |
+          if [ "$CIRCLE_TAG" ]; then
+            make release
+          fi
+      - save_cache:
+          key: go-macos-{{ checksum "go.sum" }}
+          paths:
+            - ~/go/pkg
+
 workflows:
  version: 2
-  all:
+  build:
    jobs:
-      - build:
-          context: open-source
+      - test:
+          filters:
+            tags:
+              only: /.*/
+      - crossbuild:
+          context: open-source
+          requires:
+            - test
          filters:
            tags:
              only: /.*/
--- a/.circleci/go.mod
+++ b/.circleci/go.mod
@@ -0,0 +1,3 @@
+module github.com/int128/kubelogin/.circleci
+
+go 1.13
--- a/.github/ISSUE_TEMPLATE/bug_report.md
+++ b/.github/ISSUE_TEMPLATE/bug_report.md
@@ -0,0 +1,23 @@
+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior.
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Environment**
+ - OS: [e.g. macOS, Linux]
+ - kubelogin version: [e.g. 1.19.3]
+ - kubectl version: [e.g. 1.19]
+ - OpenID Connect provider: [e.g. Google, Okta]
--- a/.github/ISSUE_TEMPLATE/feature_request.md
+++ b/.github/ISSUE_TEMPLATE/feature_request.md
@@ -0,0 +1,17 @@
+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
--- a/.github/workflows/acceptance-test.yaml
+++ b/.github/workflows/acceptance-test.yaml
@@ -1,14 +1,12 @@
-name: acceptance-test
 on: [push]
 jobs:
-  build:
-    name: test
+  system-test:
    # https://help.github.com/en/actions/automating-your-workflow-with-github-actions/software-installed-on-github-hosted-runners#ubuntu-1804-lts
    runs-on: ubuntu-18.04
    steps:
      - uses: actions/setup-go@v1
        with:
-          go-version: 1.13
+          go-version: 1.14.1
        id: go
      - uses: actions/checkout@v1
      - uses: actions/cache@v1
@@ -19,12 +17,13 @@ jobs:
            go-
      # https://kind.sigs.k8s.io/docs/user/quick-start/
      - run: |
-          wget -q -O ./kind "https://github.com/kubernetes-sigs/kind/releases/download/v0.7.0/kind-linux-amd64"
+          wget -q -O ./kind "https://github.com/kubernetes-sigs/kind/releases/download/v0.8.1/kind-linux-amd64"
          chmod +x ./kind
          sudo mv ./kind /usr/local/bin/kind
          kind version
      # https://packages.ubuntu.com/xenial/libnss3-tools
+      - run: sudo apt update
      - run: sudo apt install -y libnss3-tools
      - run: echo '127.0.0.1 dex-server' | sudo tee -a /etc/hosts
-      - run: make -C acceptance_test -j3 setup
-      - run: make -C acceptance_test test
+      - run: make -C system_test -j3 setup
+      - run: make -C system_test test
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,6 @@
 /.idea

+/system_test/output/
 /acceptance_test/output/

 /dist/output
--- a/31
+++ b/31
@@ -1,10 +1,11 @@
-# CI must provide the following variables (on tag push)
-# VERSION
-# GITHUB_USERNAME
-# GITHUB_REPONAME
+# CircleCI specific variables
+CIRCLE_TAG ?= latest
+GITHUB_USERNAME := $(CIRCLE_PROJECT_USERNAME)
+GITHUB_REPONAME := $(CIRCLE_PROJECT_REPONAME)

 TARGET := kubelogin
-VERSION ?= latest
+TARGET_OSARCH := linux_amd64 darwin_amd64 windows_amd64 linux_arm linux_arm64
+VERSION ?= $(CIRCLE_TAG)
 LDFLAGS := -X main.version=$(VERSION)

 all: $(TARGET)
@@ -12,12 +13,6 @@ all: $(TARGET)
 $(TARGET): $(wildcard **/*.go)
 	go build -o $@ -ldflags "$(LDFLAGS)"

-.PHONY: ci
-ci:
-	$(MAKE) check
-	bash -c "bash <(curl -s https://codecov.io/bash)"
-	$(MAKE) dist
-
 .PHONY: check
 check:
 	golangci-lint run
@@ -27,7 +22,7 @@ check:
 dist: dist/output
 dist/output:
 	# make the zip files for GitHub Releases
-	VERSION=$(VERSION) CGO_ENABLED=0 goxzst -d dist/output -i "LICENSE" -o "$(TARGET)" -t "dist/kubelogin.rb dist/oidc-login.yaml dist/Dockerfile" -- -ldflags "$(LDFLAGS)"
+	VERSION=$(VERSION) goxzst -d dist/output -i "LICENSE" -o "$(TARGET)" -osarch "$(TARGET_OSARCH)" -t "dist/kubelogin.rb dist/oidc-login.yaml dist/Dockerfile" -- -ldflags "$(LDFLAGS)"
 	# test the zip file
 	zipinfo dist/output/kubelogin_linux_amd64.zip
 	# make the krew yaml structure
@@ -52,15 +47,3 @@ clean:
 	-rm $(TARGET)
 	-rm -r dist/output/
 	-rm coverage.out gotest.log
-
-.PHONY: ci-setup-linux-amd64
-ci-setup-linux-amd64:
-	mkdir -p ~/bin
-	# https://github.com/golangci/golangci-lint
-	curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | sh -s -- -b ~/bin v1.21.0
-	# https://github.com/int128/goxzst
-	curl -sfL -o /tmp/goxzst.zip https://github.com/int128/goxzst/releases/download/v0.3.0/goxzst_linux_amd64.zip
-	unzip /tmp/goxzst.zip -d ~/bin
-	# https://github.com/int128/ghcp
-	curl -sfL -o /tmp/ghcp.zip https://github.com/int128/ghcp/releases/download/v1.8.0/ghcp_linux_amd64.zip
-	unzip /tmp/ghcp.zip -d ~/bin
--- a/README.md
+++ b/README.md
@@ -1,10 +1,10 @@
-# kubelogin [![CircleCI](https://circleci.com/gh/int128/kubelogin.svg?style=shield)](https://circleci.com/gh/int128/kubelogin) ![acceptance-test](https://github.com/int128/kubelogin/workflows/acceptance-test/badge.svg) [![Go Report Card](https://goreportcard.com/badge/github.com/int128/kubelogin)](https://goreportcard.com/report/github.com/int128/kubelogin)
+# kubelogin [![CircleCI](https://circleci.com/gh/int128/kubelogin.svg?style=shield)](https://circleci.com/gh/int128/kubelogin) [![Go Report Card](https://goreportcard.com/badge/github.com/int128/kubelogin)](https://goreportcard.com/report/github.com/int128/kubelogin)

 This is a kubectl plugin for [Kubernetes OpenID Connect (OIDC) authentication](https://kubernetes.io/docs/reference/access-authn-authz/authentication/#openid-connect-tokens), also known as `kubectl oidc-login`.

 Here is an example of Kubernetes authentication with the Google Identity Platform:

-<img alt="screencast" src="https://user-images.githubusercontent.com/321266/70971501-7bcebc80-20e4-11ea-8afc-539dcaea0aa8.gif" width="652" height="455">
+<img alt="screencast" src="https://user-images.githubusercontent.com/321266/85427290-86e43700-b5b6-11ea-9e97-ffefd736c9b7.gif" width="572" height="391">

 Kubelogin is designed to run as a [client-go credential plugin](https://kubernetes.io/docs/reference/access-authn-authz/authentication/#client-go-credential-plugins).
 When you run kubectl, kubelogin opens the browser and you can log in to the provider.
@@ -18,22 +18,14 @@ Take a look at the diagram:

 ### Setup

-Install the latest release from [Homebrew](https://brew.sh/), [Krew](https://github.com/kubernetes-sigs/krew) or [GitHub Releases](https://github.com/int128/kubelogin/releases) as follows:
+Install the latest release from [Homebrew](https://brew.sh/), [Krew](https://github.com/kubernetes-sigs/krew) or [GitHub Releases](https://github.com/int128/kubelogin/releases).

 ```sh
-# Homebrew
+# Homebrew (macOS and Linux)
 brew install int128/kubelogin/kubelogin

-# Krew
+# Krew (macOS, Linux, Windows and ARM)
 kubectl krew install oidc-login
-
-# GitHub Releases
-curl -LO https://github.com/int128/kubelogin/releases/download/v1.16.0/kubelogin_linux_amd64.zip
-unzip kubelogin_linux_amd64.zip
-ln -s kubelogin kubectl-oidc_login
-
-# Docker
-docker run --rm quay.io/int128/kubelogin:v1.16.0
 ```

 You need to set up the OIDC provider, cluster role binding, Kubernetes API server and kubeconfig.
@@ -54,7 +46,7 @@ users:
      - --oidc-client-secret=YOUR_CLIENT_SECRET
 ```

-See [the setup guide](docs/setup.md) for more.
+See [setup guide](docs/setup.md) for more.


 ### Run
@@ -91,18 +83,25 @@ If the refresh token has expired, kubelogin will perform reauthentication.
 You can log out by removing the token cache directory (default `~/.kube/cache/oidc-login`).
 Kubelogin will perform authentication if the token cache file does not exist.

-You can dump the claims of token by passing `-v1` option.
+You can dump claims of an ID token by `setup` command.

+```console
+% kubectl oidc-login setup --oidc-issuer-url https://accounts.google.com --oidc-client-id REDACTED --oidc-client-secret REDACTED
+authentication in progress...
+
+## 2. Verify authentication
+
+You got a token with the following claims:
+
+{
+  "sub": "********",
+  "iss": "https://accounts.google.com",
+  "aud": "********",
+  ...
+}
 ```
-I1212 10:14:17.754394    2517 get_token.go:91] the ID token has the claim: sub=********
-I1212 10:14:17.754434    2517 get_token.go:91] the ID token has the claim: at_hash=********
-I1212 10:14:17.754449    2517 get_token.go:91] the ID token has the claim: nonce=********
-I1212 10:14:17.754459    2517 get_token.go:91] the ID token has the claim: iat=1576113256
-I1212 10:14:17.754467    2517 get_token.go:91] the ID token has the claim: exp=1576116856
-I1212 10:14:17.754484    2517 get_token.go:91] the ID token has the claim: iss=https://accounts.google.com
-I1212 10:14:17.754497    2517 get_token.go:91] the ID token has the claim: azp=********.apps.googleusercontent.com
-I1212 10:14:17.754506    2517 get_token.go:91] the ID token has the claim: aud=********.apps.googleusercontent.com
-```
+
+You can verify kubelogin works with your provider using [acceptance test](acceptance_test).


 ## Usage
@@ -117,21 +116,23 @@ Usage:
  kubelogin get-token [flags]

 Flags:
-      --oidc-issuer-url string              Issuer URL of the provider (mandatory)
-      --oidc-client-id string               Client ID of the provider (mandatory)
-      --oidc-client-secret string           Client secret of the provider
-      --oidc-extra-scope strings            Scopes to request to the provider
-      --certificate-authority string        Path to a cert file for the certificate authority
-      --certificate-authority-data string   Base64 encoded data for the certificate authority
-      --insecure-skip-tls-verify            If true, the server's certificate will not be checked for validity. This will make your HTTPS connections insecure
-      --token-cache-dir string              Path to a directory for caching tokens (default "~/.kube/cache/oidc-login")
-      --grant-type string                   The authorization grant type to use. One of (auto|authcode|authcode-keyboard|password) (default "auto")
-      --listen-address strings              Address to bind to the local server. If multiple addresses are given, it will try binding in order (default [127.0.0.1:8000,127.0.0.1:18000])
-      --listen-port ints                    (Deprecated: use --listen-address)
-      --skip-open-browser                   If true, it does not open the browser on authentication
-      --username string                     If set, perform the resource owner password credentials grant
-      --password string                     If set, use the password instead of asking it
-  -h, --help                                help for get-token
+      --oidc-issuer-url string                          Issuer URL of the provider (mandatory)
+      --oidc-client-id string                           Client ID of the provider (mandatory)
+      --oidc-client-secret string                       Client secret of the provider
+      --oidc-extra-scope strings                        Scopes to request to the provider
+      --certificate-authority string                    Path to a cert file for the certificate authority
+      --certificate-authority-data string               Base64 encoded data for the certificate authority
+      --insecure-skip-tls-verify                        If true, the server's certificate will not be checked for validity. This will make your HTTPS connections insecure
+      --token-cache-dir string                          Path to a directory for caching tokens (default "~/.kube/cache/oidc-login")
+      --grant-type string                               The authorization grant type to use. One of (auto|authcode|authcode-keyboard|password) (default "auto")
+      --listen-address strings                          Address to bind to the local server. If multiple addresses are given, it will try binding in order (default [127.0.0.1:8000,127.0.0.1:18000])
+      --listen-port ints                                (Deprecated: use --listen-address)
+      --skip-open-browser                               If true, it does not open the browser on authentication
+      --oidc-redirect-url-hostname string               Hostname of the redirect URL (default "localhost")
+      --oidc-auth-request-extra-params stringToString   Extra query parameters to send with an authentication request (default [])
+      --username string                                 If set, perform the resource owner password credentials grant
+      --password string                                 If set, use the password instead of asking it
+  -h, --help                                            help for get-token

 Global Flags:
      --add_dir_header                   If true, adds the file directory to the header
@@ -173,39 +174,6 @@ You can use your self-signed certificate for the provider.
 You can set the following environment variables if you are behind a proxy: `HTTP_PROXY`, `HTTPS_PROXY` and `NO_PROXY`.
 See also [net/http#ProxyFromEnvironment](https://golang.org/pkg/net/http/#ProxyFromEnvironment).

-### Docker
-
-You can run [the Docker image](https://quay.io/repository/int128/kubelogin) instead of the binary.
-The kubeconfig looks like:
-
-```yaml
-users:
- name: oidc
-  user:
-    exec:
-      apiVersion: client.authentication.k8s.io/v1beta1
-      command: docker
-      args:
-      - run
-      - --rm
-      - -v
-      - /tmp/.token-cache:/.token-cache
-      - -p
-      - 8000:8000
-      - quay.io/int128/kubelogin:v1.16.0
-      - get-token
-      - --token-cache-dir=/.token-cache
-      - --listen-address=0.0.0.0:8000
-      - --oidc-issuer-url=ISSUER_URL
-      - --oidc-client-id=YOUR_CLIENT_ID
-      - --oidc-client-secret=YOUR_CLIENT_SECRET
-```
-
-Known limitations:
-
- It cannot open the browser automatically.
- The container port and listen port must be equal for consistency of the redirect URI.
-
 ### Authentication flows

 #### Authorization code flow
@@ -225,6 +193,18 @@ You can change the listening address.
      - --listen-address=127.0.0.1:23456
 ```

+You can change the hostname of redirect URI from the default value `localhost`.
+
+```yaml
+      - --oidc-redirect-url-hostname=127.0.0.1
+```
+
+You can add extra parameters to the authentication request.
+
+```yaml
+      - --oidc-auth-request-extra-params=ttl=86400
+```
+
 #### Authorization code flow with keyboard interactive

 If you cannot access the browser, instead use the authorization code flow with keyboard interactive.
@@ -245,6 +225,12 @@ Enter code: YOUR_CODE
 Note that this flow uses the redirect URI `urn:ietf:wg:oauth:2.0:oob` and
 some OIDC providers do not support it.

+You can add extra parameters to the authentication request.
+
+```yaml
+      - --oidc-auth-request-extra-params=ttl=86400
+```
+
 #### Resource owner password credentials grant flow

 Kubelogin performs the resource owner password credentials grant flow
@@ -283,6 +269,39 @@ Username: foo
 Password:
 ```

+### Docker
+
+You can run [the Docker image](https://quay.io/repository/int128/kubelogin) instead of the binary.
+The kubeconfig looks like:
+
+```yaml
+users:
+- name: oidc
+  user:
+    exec:
+      apiVersion: client.authentication.k8s.io/v1beta1
+      command: docker
+      args:
+      - run
+      - --rm
+      - -v
+      - /tmp/.token-cache:/.token-cache
+      - -p
+      - 8000:8000
+      - quay.io/int128/kubelogin
+      - get-token
+      - --token-cache-dir=/.token-cache
+      - --listen-address=0.0.0.0:8000
+      - --oidc-issuer-url=ISSUER_URL
+      - --oidc-client-id=YOUR_CLIENT_ID
+      - --oidc-client-secret=YOUR_CLIENT_SECRET
+```
+
+Known limitations:
+
+- It cannot open the browser automatically.
+- The container port and listen port must be equal for consistency of the redirect URI.
+

 ## Related works

@@ -309,4 +328,4 @@ make
 ./kubelogin
 ```

-See also [the acceptance test](acceptance_test).
+See also [the system test](system_test).
--- a/acceptance_test/Makefile
+++ b/acceptance_test/Makefile
@@ -1,99 +1,31 @@
 CLUSTER_NAME := kubelogin-acceptance-test
 OUTPUT_DIR := $(CURDIR)/output

-PATH := $(PATH):$(OUTPUT_DIR)/bin
-export PATH
 KUBECONFIG := $(OUTPUT_DIR)/kubeconfig.yaml
 export KUBECONFIG

-# run the login script instead of opening chrome
-BROWSER := $(OUTPUT_DIR)/bin/chromelogin
-export BROWSER
-
-.PHONY: test
-test: build
-	# see the setup instruction
-	kubectl oidc-login setup \
-		--oidc-issuer-url=https://dex-server:10443/dex \
-		--oidc-client-id=YOUR_CLIENT_ID \
-		--oidc-client-secret=YOUR_CLIENT_SECRET \
-		--oidc-extra-scope=email \
-		--certificate-authority=$(OUTPUT_DIR)/ca.crt
-	# set up the kubeconfig
-	kubectl config set-credentials oidc \
-		--exec-api-version=client.authentication.k8s.io/v1beta1 \
-		--exec-command=kubectl \
-		--exec-arg=oidc-login \
-		--exec-arg=get-token \
-		--exec-arg=--oidc-issuer-url=https://dex-server:10443/dex \
-		--exec-arg=--oidc-client-id=YOUR_CLIENT_ID \
-		--exec-arg=--oidc-client-secret=YOUR_CLIENT_SECRET \
-		--exec-arg=--oidc-extra-scope=email \
-		--exec-arg=--certificate-authority=$(OUTPUT_DIR)/ca.crt
-	# make sure we can access the cluster
-	kubectl --user=oidc cluster-info
-	# switch the current context
-	kubectl config set-context --current --user=oidc
-	# make sure we can access the cluster
-	kubectl cluster-info
-
-.PHONY: setup
-setup: build dex cluster setup-chrome
-
-.PHONY: setup-chrome
-setup-chrome: $(OUTPUT_DIR)/ca.crt
-	# add the dex server certificate to the trust store
-	mkdir -p ~/.pki/nssdb
-	cd ~/.pki/nssdb && certutil -A -d sql:. -n dex -i $(OUTPUT_DIR)/ca.crt -t "TC,,"
-
-# build binaries
-.PHONY: build
-build: $(OUTPUT_DIR)/bin/kubectl-oidc_login $(OUTPUT_DIR)/bin/chromelogin
-$(OUTPUT_DIR)/bin/kubectl-oidc_login:
-	go build -o $@ ..
-$(OUTPUT_DIR)/bin/chromelogin: chromelogin/main.go
-	go build -o $@ ./chromelogin
-
-# create a Dex server
-.PHONY: dex
-dex: $(OUTPUT_DIR)/server.crt $(OUTPUT_DIR)/server.key
-	docker create --name dex-server -p 10443:10443 quay.io/dexidp/dex:v2.21.0 serve /dex.yaml
-	docker cp $(OUTPUT_DIR)/server.crt dex-server:/
-	docker cp $(OUTPUT_DIR)/server.key dex-server:/
-	docker cp dex.yaml dex-server:/
-	docker start dex-server
-	docker logs dex-server
-
-$(OUTPUT_DIR)/ca.key:
-	mkdir -p $(OUTPUT_DIR)
-	openssl genrsa -out $@ 2048
-$(OUTPUT_DIR)/ca.csr: $(OUTPUT_DIR)/ca.key
-	openssl req -new -key $(OUTPUT_DIR)/ca.key -out $@ -subj "/CN=dex-ca" -config openssl.cnf
-$(OUTPUT_DIR)/ca.crt: $(OUTPUT_DIR)/ca.key $(OUTPUT_DIR)/ca.csr
-	openssl x509 -req -in $(OUTPUT_DIR)/ca.csr -signkey $(OUTPUT_DIR)/ca.key -out $@ -days 10
-$(OUTPUT_DIR)/server.key:
-	mkdir -p $(OUTPUT_DIR)
-	openssl genrsa -out $@ 2048
-$(OUTPUT_DIR)/server.csr: openssl.cnf $(OUTPUT_DIR)/server.key
-	openssl req -new -key $(OUTPUT_DIR)/server.key -out $@ -subj "/CN=dex-server" -config openssl.cnf
-$(OUTPUT_DIR)/server.crt: openssl.cnf $(OUTPUT_DIR)/server.csr $(OUTPUT_DIR)/ca.crt $(OUTPUT_DIR)/ca.key
-	openssl x509 -req -in $(OUTPUT_DIR)/server.csr -CA $(OUTPUT_DIR)/ca.crt -CAkey $(OUTPUT_DIR)/ca.key -CAcreateserial -out $@ -sha256 -days 10 -extensions v3_req -extfile openssl.cnf
-
 # create a Kubernetes cluster
 .PHONY: cluster
-cluster: dex create-cluster
-	# add the Dex container IP to /etc/hosts of kube-apiserver
-	docker inspect -f '{{.NetworkSettings.IPAddress}}' dex-server | sed -e 's,$$, dex-server,' | \
-		kubectl -n kube-system exec -i kube-apiserver-$(CLUSTER_NAME)-control-plane -- tee -a /etc/hosts
-	# wait for kube-apiserver oidc initialization
-	# (oidc authenticator will retry oidc discovery every 10s)
-	sleep 10
-
-.PHONY: create-cluster
-create-cluster: $(OUTPUT_DIR)/ca.crt
-	cp $(OUTPUT_DIR)/ca.crt /tmp/kubelogin-acceptance-test-dex-ca.crt
-	kind create cluster --name $(CLUSTER_NAME) --config cluster.yaml
-	kubectl apply -f role.yaml
+cluster:
+	# create a cluster
+	mkdir -p $(OUTPUT_DIR)
+	sed -e "s|OIDC_ISSUER_URL|$(OIDC_ISSUER_URL)|" -e "s|OIDC_CLIENT_ID|$(OIDC_CLIENT_ID)|" cluster.yaml > $(OUTPUT_DIR)/cluster.yaml
+	kind create cluster --name $(CLUSTER_NAME) --config $(OUTPUT_DIR)/cluster.yaml
+	# set up access control
+	kubectl create clusterrole cluster-readonly --verb=get,watch,list --resource='*.*'
+	kubectl create clusterrolebinding cluster-readonly --clusterrole=cluster-readonly --user=$(YOUR_EMAIL)
+	# set up kubectl
+	kubectl config set-credentials oidc \
+		--exec-api-version=client.authentication.k8s.io/v1beta1 \
+		--exec-command=$(CURDIR)/../kubelogin \
+		--exec-arg=get-token \
+		--exec-arg=--token-cache-dir=$(OUTPUT_DIR)/token-cache \
+		--exec-arg=--oidc-issuer-url=$(OIDC_ISSUER_URL) \
+		--exec-arg=--oidc-client-id=$(OIDC_CLIENT_ID) \
+		--exec-arg=--oidc-client-secret=$(OIDC_CLIENT_SECRET) \
+		--exec-arg=--oidc-extra-scope=email
+	# switch the default user
+	kubectl config set-context --current --user=oidc

 # clean up the resources
 .PHONY: clean
@@ -102,7 +34,9 @@ clean:
 .PHONY: delete-cluster
 delete-cluster:
 	kind delete cluster --name $(CLUSTER_NAME)
-.PHONY: delete-dex
-delete-dex:
-	docker stop dex-server
-	docker rm dex-server
+
+.PHONY: check
+check:
+	docker version
+	kind version
+	kubectl version --client
--- a/acceptance_test/README.md
+++ b/acceptance_test/README.md
@@ -1,91 +1,75 @@
 # kubelogin/acceptance_test

-This is an acceptance test to verify behavior of kubelogin using a real Kubernetes cluster and OpenID Connect provider.
-It runs on [GitHub Actions](https://github.com/int128/kubelogin/actions?query=workflow%3Aacceptance-test).
-
-Let's take a look at the diagram.
-
-![diagram](../docs/acceptance-test-diagram.svg)
-
-It prepares the following resources:
-
-1. Generate a pair of CA certificate and TLS server certificate for Dex.
-1. Run Dex on a container.
-1. Create a Kubernetes cluster using Kind.
-1. Mutate `/etc/hosts` of the CI machine to access Dex.
-1. Mutate `/etc/hosts` of the kube-apiserver pod to access Dex.
-
-It performs the test by the following steps:
-
-1. Run kubectl.
-1. kubectl automatically runs kubelogin.
-1. kubelogin automatically runs [chromelogin](chromelogin).
-1. chromelogin opens the browser, navigates to `http://localhost:8000` and enter the username and password.
-1. kubelogin gets an authorization code from the browser.
-1. kubelogin gets a token.
-1. kubectl accesses an API with the token.
-1. kube-apiserver verifies the token by Dex.
-1. Check if kubectl exited with code 0.
+This is a manual test for verifying Kubernetes OIDC authentication with your OIDC provider.


-## Technical consideration
+## Purpose

-### Network and DNS
+This test checks the following points:

-Consider the following issues:
-
- kube-apiserver runs on the host network of the kind container.
- kube-apiserver cannot resolve a service name by kube-dns.
- kube-apiserver cannot access a cluster IP.
- kube-apiserver can access another container via the Docker network.
- Chrome requires exactly match of domain name between Dex URL and a server certificate.
-
-Consequently,
-
- kube-apiserver accesses Dex by resolving `/etc/hosts` and via the Docker network.
- kubelogin and Chrome accesses Dex by resolving `/etc/hosts` and via the Docker network.
-
-### TLS server certificate
-
-Consider the following issues:
-
- kube-apiserver requires `--oidc-issuer` is HTTPS URL.
- kube-apiserver requires a CA certificate at startup, if `--oidc-ca-file` is given.
- kube-apiserver mounts `/usr/local/share/ca-certificates` from the kind container.
- It is possible to mount a file from the CI machine.
- It is not possible to issue a certificate using Let's Encrypt in runtime.
- Chrome requires a valid certificate in `~/.pki/nssdb`.
-
-As a result,
-
- kube-apiserver uses the CA certificate of `/usr/local/share/ca-certificates/dex-ca.crt`. See the `extraMounts` section of [`cluster.yaml`](cluster.yaml).
- kubelogin uses the CA certificate in `output/ca.crt`.
- Chrome uses the CA certificate in `~/.pki/nssdb`.
-
-### Test environment
-
- Set the issuer URL to kubectl. See [`kubeconfig_oidc.yaml`](kubeconfig_oidc.yaml).
- Set the issuer URL to kube-apiserver. See [`cluster.yaml`](cluster.yaml).
- Set `BROWSER` environment variable to run [`chromelogin`](chromelogin) by `xdg-open`.
+1. You can set up your OIDC provider using [setup guide](../docs/setup.md).
+1. The plugin works with your OIDC provider.


-## Run locally
+## Getting Started

-You need to set up Docker and Kind.
+### Prerequisite

-You need to add the following line to `/etc/hosts`:
+You need to build the plugin into the parent directory.

-```
-127.0.0.1 dex-server
+```sh
+make -C ..
 ```

-Run:
+You need to set up your provider.
+See [setup guide](../docs/setup.md) for more.

-```shell script
-# run the test
-make
+You need to install the following tools:

-# clean up
+- Docker
+- Kind
+- kubectl
+
+You can check if the tools are available.
+
+```sh
+make check
+```
+
+### 1. Create a cluster
+
+Create a cluster.
+For example, you can create a cluster with Google account authentication.
+
+```sh
+make OIDC_ISSUER_URL=https://accounts.google.com \
+  OIDC_CLIENT_ID=REDACTED.apps.googleusercontent.com \
+  OIDC_CLIENT_SECRET=REDACTED \
+  YOUR_EMAIL=REDACTED@gmail.com
+```
+
+It will do the following steps:
+
+1. Create a cluster.
+1. Set up access control. It allows read-only access from your email address.
+1. Set up kubectl to enable the plugin.
+
+You can change kubectl configuration in generated `output/kubeconfig.yaml`.
+
+### 2. Run kubectl
+
+Make sure you can log in to the provider and access the cluster.
+
+```console
+% export KUBECONFIG=$PWD/output/kubeconfig.yaml
+% kubectl get pods -A
+```
+
+### Clean up
+
+To delete the cluster and generated files:
+
+```sh
 make delete-cluster
-make delete-dex
+make clean
 ```
--- a/acceptance_test/cluster.yaml
+++ b/acceptance_test/cluster.yaml
@@ -1,6 +1,5 @@
 kind: Cluster
 apiVersion: kind.x-k8s.io/v1alpha4
-# https://github.com/dexidp/dex/blob/master/Documentation/kubernetes.md
 kubeadmConfigPatches:
  - |
    apiVersion: kubeadm.k8s.io/v1beta2
@@ -9,12 +8,6 @@ kubeadmConfigPatches:
      name: config
    apiServer:
      extraArgs:
-        oidc-issuer-url: https://dex-server:10443/dex
-        oidc-client-id: YOUR_CLIENT_ID
+        oidc-issuer-url: OIDC_ISSUER_URL
+        oidc-client-id: OIDC_CLIENT_ID
        oidc-username-claim: email
-        oidc-ca-file: /usr/local/share/ca-certificates/dex-ca.crt
-nodes:
-  - role: control-plane
-    extraMounts:
-      - hostPath: /tmp/kubelogin-acceptance-test-dex-ca.crt
-        containerPath: /usr/local/share/ca-certificates/dex-ca.crt
--- a/acceptance_test/role.yaml
+++ b/acceptance_test/role.yaml
@@ -1,21 +0,0 @@
-apiVersion: rbac.authorization.k8s.io/v1
-kind: ClusterRole
-metadata:
-  name: readonly-all-resources
-rules:
-  - apiGroups: ["*"]
-    resources: ["*"]
-    verbs: ["get", "watch", "list"]
---
-apiVersion: rbac.authorization.k8s.io/v1
-kind: ClusterRoleBinding
-metadata:
-  name: readonly-all-resources
-subjects:
-  - kind: User
-    name: admin@example.com
-    apiGroup: rbac.authorization.k8s.io
-roleRef:
-  kind: ClusterRole
-  name: readonly-all-resources
-  apiGroup: rbac.authorization.k8s.io
--- a/dist/kubelogin.rb
+++ b/dist/kubelogin.rb
@@ -1,15 +1,27 @@
 class Kubelogin < Formula
  desc "A kubectl plugin for Kubernetes OpenID Connect authentication"
  homepage "https://github.com/int128/kubelogin"
-  url "https://github.com/int128/kubelogin/releases/download/{{ env "VERSION" }}/kubelogin_darwin_amd64.zip"
+  baseurl = "https://github.com/int128/kubelogin/releases/download"
  version "{{ env "VERSION" }}"
-  sha256 "{{ sha256 .darwin_amd64_archive }}"
+  
+  if OS.mac?
+    kernel = "darwin"
+    sha256 "{{ sha256 .darwin_amd64_archive }}"
+  elsif OS.linux?
+    kernel = "linux"
+    sha256 "{{ sha256 .linux_amd64_archive }}"
+  end 
+   
+  url baseurl + "/#{version}/kubelogin_#{kernel}_amd64.zip"
+    
  def install
    bin.install "kubelogin" => "kubelogin"
    ln_s bin/"kubelogin", bin/"kubectl-oidc_login"
  end
+  
  test do
    system "#{bin}/kubelogin -h"
    system "#{bin}/kubectl-oidc_login -h"
  end
+    
 end
--- a/dist/oidc-login.yaml
+++ b/dist/oidc-login.yaml
@@ -22,8 +22,6 @@ spec:

  caveats: |
    You need to setup the OIDC provider, Kubernetes API server, role binding and kubeconfig.
-    See https://github.com/int128/kubelogin for more.
-
  version: {{ env "VERSION" }}
  platforms:
    - uri: https://github.com/int128/kubelogin/releases/download/{{ env "VERSION" }}/kubelogin_linux_amd64.zip
@@ -62,3 +60,27 @@ spec:
        matchLabels:
          os: windows
          arch: amd64
+    - uri: https://github.com/int128/kubelogin/releases/download/{{ env "VERSION" }}/kubelogin_linux_arm.zip
+      sha256: "{{ sha256 .linux_arm_archive }}"
+      bin: kubelogin
+      files:
+        - from: kubelogin
+          to: .
+        - from: LICENSE
+          to: .
+      selector:
+        matchLabels:
+          os: linux
+          arch: arm
+    - uri: https://github.com/int128/kubelogin/releases/download/{{ env "VERSION" }}/kubelogin_linux_arm64.zip
+      sha256: "{{ sha256 .linux_arm64_archive }}"
+      bin: kubelogin
+      files:
+        - from: kubelogin
+          to: .
+        - from: LICENSE
+          to: .
+      selector:
+        matchLabels:
+          os: linux
+          arch: arm64
--- a/docs/setup.md
+++ b/docs/setup.md
@@ -126,6 +126,9 @@ Variable                | Value

 You do not need to set `YOUR_CLIENT_SECRET`.

+If you need `groups` claim for access control,
+see [jetstack/okta-kubectl-auth](https://github.com/jetstack/okta-kubectl-auth/blob/master/docs/okta-setup.md) and [#250](https://github.com/int128/kubelogin/issues/250).
+

 ## 2. Verify authentication

@@ -152,24 +155,9 @@ kubectl oidc-login setup --help
 ## 3. Bind a cluster role

 Here bind `cluster-admin` role to you.
-Apply the following manifest:
-
-```yaml
-kind: ClusterRoleBinding
-apiVersion: rbac.authorization.k8s.io/v1
-metadata:
-  name: oidc-cluster-admin
-roleRef:
-  apiGroup: rbac.authorization.k8s.io
-  kind: ClusterRole
-  name: cluster-admin
-subjects:
- kind: User
-  name: ISSUER_URL#YOUR_SUBJECT
-```

 ```sh
-kubectl apply -f oidc-cluster-admin.yaml
+kubectl create clusterrolebinding oidc-cluster-admin --clusterrole=cluster-admin --user='ISSUER_URL#YOUR_SUBJECT'
 ```

 As well as you can create a custom cluster role and bind it.
--- a/docs/standalone-mode.md
+++ b/docs/standalone-mode.md
@@ -99,31 +99,33 @@ Available Commands:
  version     Print the version information

 Flags:
-      --kubeconfig string                Path to the kubeconfig file
-      --context string                   The name of the kubeconfig context to use
-      --user string                      The name of the kubeconfig user to use. Prior to --context
-      --certificate-authority string     Path to a cert file for the certificate authority
-      --insecure-skip-tls-verify         If true, the server's certificate will not be checked for validity. This will make your HTTPS connections insecure
-      --grant-type string                The authorization grant type to use. One of (auto|authcode|authcode-keyboard|password) (default "auto")
-      --listen-address strings           Address to bind to the local server. If multiple addresses are given, it will try binding in order (default [127.0.0.1:8000,127.0.0.1:18000])
-      --listen-port ints                 (Deprecated: use --listen-address)
-      --skip-open-browser                If true, it does not open the browser on authentication
-      --username string                  If set, perform the resource owner password credentials grant
-      --password string                  If set, use the password instead of asking it
-      --add_dir_header                   If true, adds the file directory to the header
-      --alsologtostderr                  log to standard error as well as files
-      --log_backtrace_at traceLocation   when logging hits line file:N, emit a stack trace (default :0)
-      --log_dir string                   If non-empty, write log files in this directory
-      --log_file string                  If non-empty, use this log file
-      --log_file_max_size uint           Defines the maximum size a log file can grow to. Unit is megabytes. If the value is 0, the maximum file size is unlimited. (default 1800)
-      --logtostderr                      log to standard error instead of files (default true)
-      --skip_headers                     If true, avoid header prefixes in the log messages
-      --skip_log_headers                 If true, avoid headers when opening log files
-      --stderrthreshold severity         logs at or above this threshold go to stderr (default 2)
-  -v, --v Level                          number for the log level verbosity
-      --vmodule moduleSpec               comma-separated list of pattern=N settings for file-filtered logging
-  -h, --help                             help for main
-      --version                          version for main
+      --kubeconfig string                               Path to the kubeconfig file
+      --context string                                  The name of the kubeconfig context to use
+      --user string                                     The name of the kubeconfig user to use. Prior to --context
+      --certificate-authority string                    Path to a cert file for the certificate authority
+      --insecure-skip-tls-verify                        If true, the server's certificate will not be checked for validity. This will make your HTTPS connections insecure
+      --grant-type string                               The authorization grant type to use. One of (auto|authcode|authcode-keyboard|password) (default "auto")
+      --listen-address strings                          Address to bind to the local server. If multiple addresses are given, it will try binding in order (default [127.0.0.1:8000,127.0.0.1:18000])
+      --listen-port ints                                (Deprecated: use --listen-address)
+      --skip-open-browser                               If true, it does not open the browser on authentication
+      --oidc-redirect-url-hostname string               Hostname of the redirect URL (default "localhost")
+      --oidc-auth-request-extra-params stringToString   Extra query parameters to send with an authentication request (default [])
+      --username string                                 If set, perform the resource owner password credentials grant
+      --password string                                 If set, use the password instead of asking it
+      --add_dir_header                                  If true, adds the file directory to the header
+      --alsologtostderr                                 log to standard error as well as files
+      --log_backtrace_at traceLocation                  when logging hits line file:N, emit a stack trace (default :0)
+      --log_dir string                                  If non-empty, write log files in this directory
+      --log_file string                                 If non-empty, use this log file
+      --log_file_max_size uint                          Defines the maximum size a log file can grow to. Unit is megabytes. If the value is 0, the maximum file size is unlimited. (default 1800)
+      --logtostderr                                     log to standard error instead of files (default true)
+      --skip_headers                                    If true, avoid header prefixes in the log messages
+      --skip_log_headers                                If true, avoid headers when opening log files
+      --stderrthreshold severity                        logs at or above this threshold go to stderr (default 2)
+  -v, --v Level                                         number for the log level verbosity
+      --vmodule moduleSpec                              comma-separated list of pattern=N settings for file-filtered logging
+  -h, --help                                            help for kubelogin
+      --version                                         version for kubelogin
 ```

 ### Kubeconfig
--- a/docs/acceptance-test-diagram.svg
+++ b/docs/acceptance-test-diagram.svg
--- a/go.mod
+++ b/go.mod
@@ -6,21 +6,21 @@ require (
 	github.com/chromedp/chromedp v0.5.3
 	github.com/coreos/go-oidc v2.2.1+incompatible
 	github.com/dgrijalva/jwt-go v3.2.0+incompatible
-	github.com/golang/mock v1.4.0
-	github.com/google/go-cmp v0.4.0
+	github.com/golang/mock v1.4.3
+	github.com/google/go-cmp v0.5.0
 	github.com/google/wire v0.4.0
-	github.com/int128/oauth2cli v1.8.1
+	github.com/int128/oauth2cli v1.12.1
 	github.com/pkg/browser v0.0.0-20180916011732-0a3d74bf9ce4
 	github.com/pquerna/cachecontrol v0.0.0-20180517163645-1555304b9b35 // indirect
-	github.com/spf13/cobra v0.0.5
+	github.com/spf13/cobra v1.0.0
 	github.com/spf13/pflag v1.0.5
-	golang.org/x/crypto v0.0.0-20190820162420-60c769a6c586
-	golang.org/x/oauth2 v0.0.0-20190604053449-0f29369cfe45
-	golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e
+	golang.org/x/crypto v0.0.0-20200220183623-bac4c82f6975
+	golang.org/x/oauth2 v0.0.0-20200107190931-bf48bf16ab8d
+	golang.org/x/sync v0.0.0-20200317015054-43a5402ce75a
 	golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543
 	gopkg.in/square/go-jose.v2 v2.3.1 // indirect
-	gopkg.in/yaml.v2 v2.2.8
-	k8s.io/apimachinery v0.17.2
-	k8s.io/client-go v0.17.2
+	gopkg.in/yaml.v2 v2.3.0
+	k8s.io/apimachinery v0.18.5
+	k8s.io/client-go v0.18.5
 	k8s.io/klog v1.0.0
 )
--- a/go.sum
+++ b/go.sum
@@ -10,56 +10,71 @@ github.com/Azure/go-autorest/logger v0.1.0/go.mod h1:oExouG+K6PryycPJfVSxi/koC6L
 github.com/Azure/go-autorest/tracing v0.5.0/go.mod h1:r/s2XiOKccPW3HrqB+W0TQzfbtp2fGCgRFtBroKn4Dk=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
 github.com/NYTimes/gziphandler v0.0.0-20170623195520-56545f4a5d46/go.mod h1:3wb06e3pkSAbeQ52E9H9iFoQsEEwGN64994WTCIhntQ=
+github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=
 github.com/PuerkitoBio/purell v1.0.0/go.mod h1:c11w/QuzBsJSee3cPx9rAFu61PvFxuPbtSwDGJws/X0=
 github.com/PuerkitoBio/urlesc v0.0.0-20160726150825-5bd2802263f2/go.mod h1:uGdkoq3SwY9Y+13GIhn11/XLaGBb4BfwItxLd5jeuXE=
+github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
+github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
 github.com/armon/consul-api v0.0.0-20180202201655-eb2c6b5be1b6/go.mod h1:grANhF5doyWs3UAsr3K4I6qtAmlQcZDesFNEHPZAzj8=
+github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
+github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
+github.com/cespare/xxhash v1.1.0/go.mod h1:XrSqR1VqqWfGrhpAt58auRo0WTKS1nRRg3ghfAqPWnc=
 github.com/chromedp/cdproto v0.0.0-20200116234248-4da64dd111ac h1:T7V5BXqnYd55Hj/g5uhDYumg9Fp3rMTS6bykYtTIFX4=
 github.com/chromedp/cdproto v0.0.0-20200116234248-4da64dd111ac/go.mod h1:PfAWWKJqjlGFYJEidUM6aVIWPr0EpobeyVWEEmplX7g=
 github.com/chromedp/chromedp v0.5.3 h1:F9LafxmYpsQhWQBdCs+6Sret1zzeeFyHS5LkRF//Ffg=
 github.com/chromedp/chromedp v0.5.3/go.mod h1:YLdPtndaHQ4rCpSpBG+IPpy9JvX0VD+7aaLxYgYj28w=
 github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
+github.com/coreos/bbolt v1.3.2/go.mod h1:iRUV2dpdMOn7Bo10OQBFzIJO9kkE559Wcmn+qkEiiKk=
 github.com/coreos/etcd v3.3.10+incompatible/go.mod h1:uF7uidLiAD3TWHmW31ZFd/JWoc32PjwdhPthX9715RE=
-github.com/coreos/go-etcd v2.0.0+incompatible/go.mod h1:Jez6KQU2B/sWsbdaef3ED8NzMklzPG4d5KIOhIy30Tk=
-github.com/coreos/go-oidc v2.1.0+incompatible h1:sdJrfw8akMnCuUlaZU3tE/uYXFgfqom8DBE9so9EBsM=
-github.com/coreos/go-oidc v2.1.0+incompatible/go.mod h1:CgnwVTmzoESiwO9qyAFEMiHoZ1nMCKZlZ9V6mm3/LKc=
 github.com/coreos/go-oidc v2.2.1+incompatible h1:mh48q/BqXqgjVHpy2ZY7WnWAbenxRjsz9N1i1YxjHAk=
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@@ -67,13 +82,12 @@ github.com/google/btree v1.0.0/go.mod h1:lNA+9X1NB3Zf8V7Ke586lFgjr2dZNuvo3lPJSGZ
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@@ -82,8 +96,13 @@ github.com/google/wire v0.4.0 h1:kXcsA/rIGzJImVqPdhfnr6q0xsS9gU0515q1EPpJ9fE=
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@@ -92,18 +111,23 @@ github.com/imdario/mergo v0.3.5 h1:JboBksRwiiAJWvIYJVo46AfV+IAIKZpfrSzVKj42R4Q=
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@@ -113,79 +137,107 @@ github.com/magiconair/properties v1.8.0/go.mod h1:PppfXfuXeibc/6YijjN8zIbojt8czP
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+golang.org/x/sys v0.0.0-20181116152217-5ac8a444bdc5/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190209173611-3b5209105503/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20190826190057-c7b8b68b1456 h1:ng0gs1AKnRRuEMZoTLLlbOd+C17zUDepwGQBb/n+JVg=
-golang.org/x/sys v0.0.0-20190826190057-c7b8b68b1456/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20191022100944-742c48ecaeb7/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200116001909-b77594299b42 h1:vEOn+mP2zCOVzKckCZy6YsCtDblrpj/w7B9nxGNELpg=
 golang.org/x/sys v0.0.0-20200116001909-b77594299b42/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.0.0-20160726164857-2910a502d2bf/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
@@ -215,16 +268,16 @@ golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
 golang.org/x/time v0.0.0-20181108054448-85acf8d2951c/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
 golang.org/x/time v0.0.0-20190308202827-9d24e82272b4 h1:SvFZT6jyqRaOeXpc5h/JSfZenJ2O330aBsf7JfSUXmQ=
 golang.org/x/time v0.0.0-20190308202827-9d24e82272b4/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
+golang.org/x/tools v0.0.0-20180221164845-07fd8470d635/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20181011042414-1f849cf54d09/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20181030221726-6c7e314b6563/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20190114222345-bf090417da8b/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20190226205152-f727befe758c/go.mod h1:9Yl7xja0Znq3iFh3HoIrodX9oNMXvdceNzlUR8zjMvY=
+golang.org/x/tools v0.0.0-20190311212946-11955173bddd/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
 golang.org/x/tools v0.0.0-20190312170243-e65039ee4138/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
 golang.org/x/tools v0.0.0-20190422233926-fe54fb35175b/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
 golang.org/x/tools v0.0.0-20190425150028-36563e24a262/go.mod h1:RgjU9mgBXZiqYHBnxXauZ1Gv1EHHAz9KjViQ78xBX0Q=
-golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7 h1:9zdDQZ7Thm29KFXgAX/+yaf3eVbP7djjWp/dXAppNCc=
-golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 google.golang.org/api v0.4.0/go.mod h1:8k5glujaEP+g9n7WNsDg8QP6cUVNI86fCNMcbazEtwE=
@@ -236,6 +289,8 @@ google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8/go.mod h1:JiN7NxoA
 google.golang.org/genproto v0.0.0-20190307195333-5fe7a883aa19/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
 google.golang.org/genproto v0.0.0-20190418145605-e7d98fc518a7/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
 google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
+google.golang.org/grpc v1.21.0/go.mod h1:oYelfM1adQP15Ek0mdvEgi9Df8B9CZIaU1084ijfRaM=
+gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
@@ -243,36 +298,43 @@ gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8
 gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
 gopkg.in/inf.v0 v0.9.1 h1:73M5CoZyi3ZLMOyDlQh031Cx6N9NDJ2Vvfl76EDAgDc=
 gopkg.in/inf.v0 v0.9.1/go.mod h1:cWUDdTG/fYaXco+Dcufb5Vnc6Gp2YChqWtbxRZE0mXw=
+gopkg.in/resty.v1 v1.12.0/go.mod h1:mDo4pnntr5jdWRML875a/NmxYqAlA73dVijT2AXvQQo=
 gopkg.in/square/go-jose.v2 v2.3.1 h1:SK5KegNXmKmqE342YYN2qPHEnUYeoMiXXl1poUlI+o4=
 gopkg.in/square/go-jose.v2 v2.3.1/go.mod h1:M9dMgbHiYLoDGQrXy7OpJDJWiKiU//h+vD76mk0e1AI=
 gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
+gopkg.in/yaml.v2 v2.0.0-20170812160011-eb3733d160e7/go.mod h1:JAlM8MvJe8wmxCU4Bli9HhUf9+ttbYbLASfIpnQbh74=
 gopkg.in/yaml.v2 v2.2.1 h1:mUhvW9EsL+naU5Q3cakzfE91YhliOondGd6ZrsDBHQE=
 gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.8 h1:obN1ZagJSUGI0Ek/LBmuj4SNLPfIny3KsKFopxRdj10=
 gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.3.0 h1:clyUAQHOM3G0M3f5vQj7LuJrETvjVot3Z5el9nffUtU=
+gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
-k8s.io/api v0.17.2 h1:NF1UFXcKN7/OOv1uxdRz3qfra8AHsPav5M93hlV9+Dc=
-k8s.io/api v0.17.2/go.mod h1:BS9fjjLc4CMuqfSO8vgbHPKMt5+SF0ET6u/RVDihTo4=
-k8s.io/apimachinery v0.17.2 h1:hwDQQFbdRlpnnsR64Asdi55GyCaIP/3WQpMmbNBeWr4=
-k8s.io/apimachinery v0.17.2/go.mod h1:b9qmWdKlLuU9EBh+06BtLcSf/Mu89rWL33naRxs1uZg=
-k8s.io/client-go v0.17.2 h1:ndIfkfXEGrNhLIgkr0+qhRguSD3u6DCmonepn1O6NYc=
-k8s.io/client-go v0.17.2/go.mod h1:QAzRgsa0C2xl4/eVpeVAZMvikCn8Nm81yqVx3Kk9XYI=
+k8s.io/api v0.18.5 h1:fKbCxr+U3fu7k6jB+QeYPD/c6xKYeSJ2KVWmyUypuWM=
+k8s.io/api v0.18.5/go.mod h1:tN+e/2nbdGKOAH55NMV8oGrMG+3uRlA9GaRfvnCCSNk=
+k8s.io/apimachinery v0.18.5 h1:Lh6tgsM9FMkC12K5T5QjRm7rDs6aQN5JHkA0JomULDM=
+k8s.io/apimachinery v0.18.5/go.mod h1:OaXp26zu/5J7p0f92ASynJa1pZo06YlV9fG7BoWbCko=
+k8s.io/client-go v0.18.5 h1:cLhGZdOmyPhwtt20Lrb7uAqxxB1uvY+NTmNJvno1oKA=
+k8s.io/client-go v0.18.5/go.mod h1:EsiD+7Fx+bRckKWZXnAXRKKetm1WuzPagH4iOSC8x58=
 k8s.io/gengo v0.0.0-20190128074634-0689ccc1d7d6/go.mod h1:ezvh/TsK7cY6rbqRK0oQQ8IAqLxYwwyPxAX1Pzy0ii0=
 k8s.io/klog v0.0.0-20181102134211-b9b56d5dfc92/go.mod h1:Gq+BEi5rUBO/HRz0bTSXDUcqjScdoY3a9IHpCEIOOfk=
 k8s.io/klog v0.3.0/go.mod h1:Gq+BEi5rUBO/HRz0bTSXDUcqjScdoY3a9IHpCEIOOfk=
 k8s.io/klog v1.0.0 h1:Pt+yjF5aB1xDSVbau4VsWe+dQNzA0qv1LlXdC2dF6Q8=
 k8s.io/klog v1.0.0/go.mod h1:4Bi6QPql/J/LkTDqv7R/cd3hPo4k2DG6Ptcz060Ez5I=
-k8s.io/kube-openapi v0.0.0-20191107075043-30be4d16710a/go.mod h1:1TqjTSzOxsLGIKfj0lK8EeCP7K1iUG65v09OM0/WG5E=
-k8s.io/utils v0.0.0-20191114184206-e782cd3c129f h1:GiPwtSzdP43eI1hpPCbROQCCIgCuiMMNF8YUVLF3vJo=
-k8s.io/utils v0.0.0-20191114184206-e782cd3c129f/go.mod h1:sZAwmy6armz5eXlNoLmJcl4F1QuKu7sr+mFQ0byX7Ew=
+k8s.io/kube-openapi v0.0.0-20200410145947-61e04a5be9a6/go.mod h1:GRQhZsXIAJ1xR0C9bd8UpWHZ5plfAS9fzPjJuQ6JL3E=
+k8s.io/utils v0.0.0-20200324210504-a9aa75ae1b89 h1:d4vVOjXm687F1iLSP2q3lyPPuyvTUt3aVoBpi2DqRsU=
+k8s.io/utils v0.0.0-20200324210504-a9aa75ae1b89/go.mod h1:sZAwmy6armz5eXlNoLmJcl4F1QuKu7sr+mFQ0byX7Ew=
 rsc.io/quote/v3 v3.1.0 h1:9JKUTTIUgS6kzR9mK1YuGKv6Nl+DijDNIc0ghT58FaY=
 rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
 rsc.io/sampler v1.3.0 h1:7uVkIFmeBqHfdjD+gZwtXXI+RODJ2Wc4O7MPEh/QiW4=
 rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=
-sigs.k8s.io/structured-merge-diff v0.0.0-20190525122527-15d366b2352e/go.mod h1:wWxsB5ozmmv/SG7nM11ayaAW51xMvak/t1r0CSlcokI=
+sigs.k8s.io/structured-merge-diff/v3 v3.0.0-20200116222232-67a7b8c61874/go.mod h1:PlARxl6Hbt/+BC80dRLi1qAmnMqwqDg62YvvVkZjemw=
+sigs.k8s.io/structured-merge-diff/v3 v3.0.0 h1:dOmIZBMfhcHS09XZkMyUgkq5trg3/jRyJYFZUiaOp8E=
+sigs.k8s.io/structured-merge-diff/v3 v3.0.0/go.mod h1:PlARxl6Hbt/+BC80dRLi1qAmnMqwqDg62YvvVkZjemw=
 sigs.k8s.io/yaml v1.1.0 h1:4A07+ZFc2wgJwo8YNlQpr1rVlgUDlxXHhPJciaPY5gs=
 sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o=
+sigs.k8s.io/yaml v1.2.0 h1:kr/MCeFWJWTwyaHoR9c8EjH9OumOmoF9YGiZd7lFm/Q=
+sigs.k8s.io/yaml v1.2.0/go.mod h1:yfXDCHCao9+ENCvLSE62v9VSji2MKu5jeNfTrofGhJc=
--- a/integration_test/credetial_plugin_test.go
+++ b/integration_test/credetial_plugin_test.go
@@ -1,25 +1,25 @@
 package integration_test

 import (
+	"bytes"
 	"context"
+	"encoding/json"
+	"io"
 	"io/ioutil"
 	"os"
 	"testing"
 	"time"

-	"github.com/golang/mock/gomock"
 	"github.com/google/go-cmp/cmp"
-	"github.com/int128/kubelogin/integration_test/idp"
-	"github.com/int128/kubelogin/integration_test/idp/mock_idp"
-	"github.com/int128/kubelogin/integration_test/keys"
-	"github.com/int128/kubelogin/integration_test/localserver"
+	"github.com/int128/kubelogin/integration_test/httpdriver"
+	"github.com/int128/kubelogin/integration_test/keypair"
+	"github.com/int128/kubelogin/integration_test/oidcserver"
 	"github.com/int128/kubelogin/pkg/adaptors/browser"
-	"github.com/int128/kubelogin/pkg/adaptors/browser/mock_browser"
-	"github.com/int128/kubelogin/pkg/adaptors/credentialpluginwriter"
-	"github.com/int128/kubelogin/pkg/adaptors/credentialpluginwriter/mock_credentialpluginwriter"
-	"github.com/int128/kubelogin/pkg/adaptors/logger/mock_logger"
-	"github.com/int128/kubelogin/pkg/adaptors/tokencache"
 	"github.com/int128/kubelogin/pkg/di"
+	"github.com/int128/kubelogin/pkg/testing/clock"
+	"github.com/int128/kubelogin/pkg/testing/logger"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	clientauthenticationv1beta1 "k8s.io/client-go/pkg/apis/clientauthentication/v1beta1"
 )

 // Run the integration tests of the credential plugin use-case.
@@ -30,6 +30,8 @@ import (
 // 4. Verify the output.
 //
 func TestCredentialPlugin(t *testing.T) {
+	timeout := 3 * time.Second
+	now := time.Date(2020, 1, 1, 0, 0, 0, 0, time.UTC)
 	tokenCacheDir, err := ioutil.TempDir("", "kube")
 	if err != nil {
 		t.Fatalf("could not create a cache dir: %s", err)
@@ -40,279 +42,348 @@ func TestCredentialPlugin(t *testing.T) {
 		}
 	}()

-	t.Run("NoTLS", func(t *testing.T) {
-		testCredentialPlugin(t, credentialPluginTestCase{
-			TokenCacheDir: tokenCacheDir,
-			Keys:          keys.None,
-			ExtraArgs: []string{
-				"--token-cache-dir", tokenCacheDir,
+	for name, tc := range map[string]struct {
+		keyPair keypair.KeyPair
+		args    []string
+	}{
+		"NoTLS": {},
+		"TLS": {
+			keyPair: keypair.Server,
+			args:    []string{"--certificate-authority", keypair.Server.CACertPath},
+		},
+	} {
+		t.Run(name, func(t *testing.T) {
+			t.Run("AuthCode", func(t *testing.T) {
+				t.Parallel()
+				ctx, cancel := context.WithTimeout(context.TODO(), timeout)
+				defer cancel()
+				sv := oidcserver.New(t, tc.keyPair, oidcserver.Config{
+					Want: oidcserver.Want{
+						Scope:             "openid",
+						RedirectURIPrefix: "http://localhost:",
+					},
+					Response: oidcserver.Response{
+						IDTokenExpiry: now.Add(time.Hour),
+					},
+				})
+				defer sv.Shutdown(t, ctx)
+				var stdout bytes.Buffer
+				runGetToken(t, ctx, getTokenConfig{
+					tokenCacheDir: tokenCacheDir,
+					issuerURL:     sv.IssuerURL(),
+					httpDriver:    httpdriver.New(ctx, t, tc.keyPair.TLSConfig),
+					now:           now,
+					stdout:        &stdout,
+					args:          tc.args,
+				})
+				assertCredentialPluginStdout(t, &stdout, sv.LastTokenResponse().IDToken, now.Add(time.Hour))
+			})
+
+			t.Run("ROPC", func(t *testing.T) {
+				t.Parallel()
+				ctx, cancel := context.WithTimeout(context.TODO(), timeout)
+				defer cancel()
+				sv := oidcserver.New(t, tc.keyPair, oidcserver.Config{
+					Want: oidcserver.Want{
+						Scope:             "openid",
+						RedirectURIPrefix: "http://localhost:",
+						Username:          "USER1",
+						Password:          "PASS1",
+					},
+					Response: oidcserver.Response{
+						IDTokenExpiry: now.Add(time.Hour),
+					},
+				})
+				defer sv.Shutdown(t, ctx)
+				var stdout bytes.Buffer
+				runGetToken(t, ctx, getTokenConfig{
+					tokenCacheDir: tokenCacheDir,
+					issuerURL:     sv.IssuerURL(),
+					httpDriver:    httpdriver.Zero(t),
+					now:           now,
+					stdout:        &stdout,
+					args: append([]string{
+						"--username", "USER1",
+						"--password", "PASS1",
+					}, tc.args...),
+				})
+				assertCredentialPluginStdout(t, &stdout, sv.LastTokenResponse().IDToken, now.Add(time.Hour))
+			})
+
+			t.Run("TokenCacheLifecycle", func(t *testing.T) {
+				t.Parallel()
+				ctx, cancel := context.WithTimeout(context.TODO(), timeout)
+				defer cancel()
+				sv := oidcserver.New(t, tc.keyPair, oidcserver.Config{})
+				defer sv.Shutdown(t, ctx)
+
+				t.Run("NoCache", func(t *testing.T) {
+					sv.SetConfig(oidcserver.Config{
+						Want: oidcserver.Want{
+							Scope:             "openid",
+							RedirectURIPrefix: "http://localhost:",
+						},
+						Response: oidcserver.Response{
+							IDTokenExpiry: now.Add(time.Hour),
+							RefreshToken:  "REFRESH_TOKEN_1",
+						},
+					})
+					var stdout bytes.Buffer
+					runGetToken(t, ctx, getTokenConfig{
+						tokenCacheDir: tokenCacheDir,
+						issuerURL:     sv.IssuerURL(),
+						httpDriver:    httpdriver.New(ctx, t, tc.keyPair.TLSConfig),
+						now:           now,
+						stdout:        &stdout,
+						args:          tc.args,
+					})
+					assertCredentialPluginStdout(t, &stdout, sv.LastTokenResponse().IDToken, now.Add(time.Hour))
+				})
+				t.Run("Valid", func(t *testing.T) {
+					sv.SetConfig(oidcserver.Config{})
+					var stdout bytes.Buffer
+					runGetToken(t, ctx, getTokenConfig{
+						tokenCacheDir: tokenCacheDir,
+						issuerURL:     sv.IssuerURL(),
+						httpDriver:    httpdriver.Zero(t),
+						now:           now,
+						stdout:        &stdout,
+						args:          tc.args,
+					})
+					assertCredentialPluginStdout(t, &stdout, sv.LastTokenResponse().IDToken, now.Add(time.Hour))
+				})
+				t.Run("Refresh", func(t *testing.T) {
+					sv.SetConfig(oidcserver.Config{
+						Want: oidcserver.Want{
+							Scope:             "openid",
+							RedirectURIPrefix: "http://localhost:",
+							RefreshToken:      "REFRESH_TOKEN_1",
+						},
+						Response: oidcserver.Response{
+							IDTokenExpiry: now.Add(3 * time.Hour),
+							RefreshToken:  "REFRESH_TOKEN_2",
+						},
+					})
+					var stdout bytes.Buffer
+					runGetToken(t, ctx, getTokenConfig{
+						tokenCacheDir: tokenCacheDir,
+						issuerURL:     sv.IssuerURL(),
+						httpDriver:    httpdriver.New(ctx, t, tc.keyPair.TLSConfig),
+						now:           now.Add(2 * time.Hour),
+						stdout:        &stdout,
+						args:          tc.args,
+					})
+					assertCredentialPluginStdout(t, &stdout, sv.LastTokenResponse().IDToken, now.Add(3*time.Hour))
+				})
+				t.Run("RefreshAgain", func(t *testing.T) {
+					sv.SetConfig(oidcserver.Config{
+						Want: oidcserver.Want{
+							Scope:             "openid",
+							RedirectURIPrefix: "http://localhost:",
+							RefreshToken:      "REFRESH_TOKEN_2",
+						},
+						Response: oidcserver.Response{
+							IDTokenExpiry: now.Add(5 * time.Hour),
+						},
+					})
+					var stdout bytes.Buffer
+					runGetToken(t, ctx, getTokenConfig{
+						tokenCacheDir: tokenCacheDir,
+						issuerURL:     sv.IssuerURL(),
+						httpDriver:    httpdriver.New(ctx, t, tc.keyPair.TLSConfig),
+						now:           now.Add(4 * time.Hour),
+						stdout:        &stdout,
+						args:          tc.args,
+					})
+					assertCredentialPluginStdout(t, &stdout, sv.LastTokenResponse().IDToken, now.Add(5*time.Hour))
+				})
+			})
+		})
+	}
+
+	t.Run("PKCE", func(t *testing.T) {
+		t.Parallel()
+		ctx, cancel := context.WithTimeout(context.TODO(), timeout)
+		defer cancel()
+		sv := oidcserver.New(t, keypair.None, oidcserver.Config{
+			Want: oidcserver.Want{
+				Scope:               "openid",
+				RedirectURIPrefix:   "http://localhost:",
+				CodeChallengeMethod: "S256",
+			},
+			Response: oidcserver.Response{
+				IDTokenExpiry:                 now.Add(time.Hour),
+				CodeChallengeMethodsSupported: []string{"plain", "S256"},
 			},
 		})
-	})
-	t.Run("TLS", func(t *testing.T) {
-		t.Run("CertFile", func(t *testing.T) {
-			testCredentialPlugin(t, credentialPluginTestCase{
-				TokenCacheDir: tokenCacheDir,
-				TokenCacheKey: tokencache.Key{CACertFilename: keys.Server.CACertPath},
-				Keys:          keys.Server,
-				ExtraArgs: []string{
-					"--token-cache-dir", tokenCacheDir,
-					"--certificate-authority", keys.Server.CACertPath,
-				},
-			})
-		})
-		t.Run("CertData", func(t *testing.T) {
-			testCredentialPlugin(t, credentialPluginTestCase{
-				TokenCacheDir: tokenCacheDir,
-				TokenCacheKey: tokencache.Key{CACertData: keys.Server.CACertBase64},
-				Keys:          keys.Server,
-				ExtraArgs: []string{
-					"--token-cache-dir", tokenCacheDir,
-					"--certificate-authority-data", keys.Server.CACertBase64,
-				},
-			})
+		defer sv.Shutdown(t, ctx)
+		var stdout bytes.Buffer
+		runGetToken(t, ctx, getTokenConfig{
+			tokenCacheDir: tokenCacheDir,
+			issuerURL:     sv.IssuerURL(),
+			httpDriver:    httpdriver.New(ctx, t, nil),
+			now:           now,
+			stdout:        &stdout,
 		})
+		assertCredentialPluginStdout(t, &stdout, sv.LastTokenResponse().IDToken, now.Add(time.Hour))
 	})
-}

-type credentialPluginTestCase struct {
-	TokenCacheDir string
-	TokenCacheKey tokencache.Key
-	Keys          keys.Keys
-	ExtraArgs     []string
-}
-
-func testCredentialPlugin(t *testing.T, tc credentialPluginTestCase) {
-	timeout := 1 * time.Second
-
-	t.Run("Defaults", func(t *testing.T) {
+	t.Run("TLSData", func(t *testing.T) {
 		t.Parallel()
 		ctx, cancel := context.WithTimeout(context.TODO(), timeout)
 		defer cancel()
-		ctrl := gomock.NewController(t)
-		defer ctrl.Finish()
-
-		provider := mock_idp.NewMockProvider(ctrl)
-		serverURL, server := localserver.Start(t, idp.NewHandler(t, provider), tc.Keys)
-		defer server.Shutdown(t, ctx)
-		var idToken string
-		setupAuthCodeFlow(t, provider, serverURL, "openid", &idToken)
-		writerMock := newCredentialPluginWriterMock(t, ctrl, &idToken)
-		browserMock := newBrowserMock(ctx, t, ctrl, tc.Keys)
-
-		args := []string{
-			"--oidc-issuer-url", serverURL,
-			"--oidc-client-id", "kubernetes",
-		}
-		args = append(args, tc.ExtraArgs...)
-		runGetTokenCmd(t, ctx, browserMock, writerMock, args)
-	})
-
-	t.Run("ResourceOwnerPasswordCredentials", func(t *testing.T) {
-		t.Parallel()
-		ctx, cancel := context.WithTimeout(context.TODO(), timeout)
-		defer cancel()
-		ctrl := gomock.NewController(t)
-		defer ctrl.Finish()
-
-		provider := mock_idp.NewMockProvider(ctrl)
-		serverURL, server := localserver.Start(t, idp.NewHandler(t, provider), tc.Keys)
-		defer server.Shutdown(t, ctx)
-		idToken := newIDToken(t, serverURL, "", tokenExpiryFuture)
-		setupROPCFlow(provider, serverURL, "openid", "USER", "PASS", idToken)
-		writerMock := newCredentialPluginWriterMock(t, ctrl, &idToken)
-		browserMock := mock_browser.NewMockInterface(ctrl)
-
-		args := []string{
-			"--oidc-issuer-url", serverURL,
-			"--oidc-client-id", "kubernetes",
-			"--username", "USER",
-			"--password", "PASS",
-		}
-		args = append(args, tc.ExtraArgs...)
-		runGetTokenCmd(t, ctx, browserMock, writerMock, args)
-	})
-
-	t.Run("HasValidToken", func(t *testing.T) {
-		t.Parallel()
-		ctx, cancel := context.WithTimeout(context.TODO(), timeout)
-		defer cancel()
-		ctrl := gomock.NewController(t)
-		defer ctrl.Finish()
-
-		provider := mock_idp.NewMockProvider(ctrl)
-		serverURL, server := localserver.Start(t, idp.NewHandler(t, provider), tc.Keys)
-		defer server.Shutdown(t, ctx)
-		idToken := newIDToken(t, serverURL, "YOUR_NONCE", tokenExpiryFuture)
-		writerMock := newCredentialPluginWriterMock(t, ctrl, &idToken)
-		browserMock := mock_browser.NewMockInterface(ctrl)
-		setupTokenCache(t, tc, serverURL, tokencache.Value{
-			IDToken:      idToken,
-			RefreshToken: "YOUR_REFRESH_TOKEN",
+		sv := oidcserver.New(t, keypair.Server, oidcserver.Config{
+			Want: oidcserver.Want{
+				Scope:             "openid",
+				RedirectURIPrefix: "http://localhost:",
+			},
+			Response: oidcserver.Response{
+				IDTokenExpiry: now.Add(time.Hour),
+			},
 		})
-
-		args := []string{
-			"--oidc-issuer-url", serverURL,
-			"--oidc-client-id", "kubernetes",
-		}
-		args = append(args, tc.ExtraArgs...)
-		runGetTokenCmd(t, ctx, browserMock, writerMock, args)
-		assertTokenCache(t, tc, serverURL, tokencache.Value{
-			IDToken:      idToken,
-			RefreshToken: "YOUR_REFRESH_TOKEN",
-		})
-	})
-
-	t.Run("HasValidRefreshToken", func(t *testing.T) {
-		t.Parallel()
-		ctx, cancel := context.WithTimeout(context.TODO(), timeout)
-		defer cancel()
-		ctrl := gomock.NewController(t)
-		defer ctrl.Finish()
-
-		provider := mock_idp.NewMockProvider(ctrl)
-		serverURL, server := localserver.Start(t, idp.NewHandler(t, provider), tc.Keys)
-		defer server.Shutdown(t, ctx)
-		validIDToken := newIDToken(t, serverURL, "YOUR_NONCE", tokenExpiryFuture)
-		expiredIDToken := newIDToken(t, serverURL, "YOUR_NONCE", tokenExpiryPast)
-
-		provider.EXPECT().Discovery().Return(idp.NewDiscoveryResponse(serverURL))
-		provider.EXPECT().GetCertificates().Return(idp.NewCertificatesResponse(keys.JWSKeyPair))
-		provider.EXPECT().Refresh("VALID_REFRESH_TOKEN").
-			Return(idp.NewTokenResponse(validIDToken, "NEW_REFRESH_TOKEN"), nil)
-
-		setupTokenCache(t, tc, serverURL, tokencache.Value{
-			IDToken:      expiredIDToken,
-			RefreshToken: "VALID_REFRESH_TOKEN",
-		})
-		writerMock := newCredentialPluginWriterMock(t, ctrl, &validIDToken)
-		browserMock := mock_browser.NewMockInterface(ctrl)
-
-		args := []string{
-			"--oidc-issuer-url", serverURL,
-			"--oidc-client-id", "kubernetes",
-		}
-		args = append(args, tc.ExtraArgs...)
-		runGetTokenCmd(t, ctx, browserMock, writerMock, args)
-		assertTokenCache(t, tc, serverURL, tokencache.Value{
-			IDToken:      validIDToken,
-			RefreshToken: "NEW_REFRESH_TOKEN",
-		})
-	})
-
-	t.Run("HasExpiredRefreshToken", func(t *testing.T) {
-		t.Parallel()
-		ctx, cancel := context.WithTimeout(context.TODO(), timeout)
-		defer cancel()
-		ctrl := gomock.NewController(t)
-		defer ctrl.Finish()
-
-		provider := mock_idp.NewMockProvider(ctrl)
-		serverURL, server := localserver.Start(t, idp.NewHandler(t, provider), tc.Keys)
-		defer server.Shutdown(t, ctx)
-		validIDToken := newIDToken(t, serverURL, "YOUR_NONCE", tokenExpiryFuture)
-		expiredIDToken := newIDToken(t, serverURL, "YOUR_NONCE", tokenExpiryPast)
-
-		setupAuthCodeFlow(t, provider, serverURL, "openid", &validIDToken)
-		provider.EXPECT().Refresh("EXPIRED_REFRESH_TOKEN").
-			Return(nil, &idp.ErrorResponse{Code: "invalid_request", Description: "token has expired"}).
-			MaxTimes(2) // package oauth2 will retry refreshing the token
-
-		setupTokenCache(t, tc, serverURL, tokencache.Value{
-			IDToken:      expiredIDToken,
-			RefreshToken: "EXPIRED_REFRESH_TOKEN",
-		})
-		writerMock := newCredentialPluginWriterMock(t, ctrl, &validIDToken)
-		browserMock := newBrowserMock(ctx, t, ctrl, tc.Keys)
-
-		args := []string{
-			"--oidc-issuer-url", serverURL,
-			"--oidc-client-id", "kubernetes",
-		}
-		args = append(args, tc.ExtraArgs...)
-		runGetTokenCmd(t, ctx, browserMock, writerMock, args)
-		assertTokenCache(t, tc, serverURL, tokencache.Value{
-			IDToken:      validIDToken,
-			RefreshToken: "YOUR_REFRESH_TOKEN",
+		defer sv.Shutdown(t, ctx)
+		var stdout bytes.Buffer
+		runGetToken(t, ctx, getTokenConfig{
+			tokenCacheDir: tokenCacheDir,
+			issuerURL:     sv.IssuerURL(),
+			httpDriver:    httpdriver.New(ctx, t, keypair.Server.TLSConfig),
+			now:           now,
+			stdout:        &stdout,
+			args:          []string{"--certificate-authority-data", keypair.Server.CACertBase64},
 		})
+		assertCredentialPluginStdout(t, &stdout, sv.LastTokenResponse().IDToken, now.Add(time.Hour))
 	})

 	t.Run("ExtraScopes", func(t *testing.T) {
 		t.Parallel()
 		ctx, cancel := context.WithTimeout(context.TODO(), timeout)
 		defer cancel()
-		ctrl := gomock.NewController(t)
-		defer ctrl.Finish()
+		sv := oidcserver.New(t, keypair.None, oidcserver.Config{
+			Want: oidcserver.Want{
+				Scope:             "email profile openid",
+				RedirectURIPrefix: "http://localhost:",
+			},
+			Response: oidcserver.Response{
+				IDTokenExpiry: now.Add(time.Hour),
+			},
+		})
+		defer sv.Shutdown(t, ctx)
+		var stdout bytes.Buffer
+		runGetToken(t, ctx, getTokenConfig{
+			tokenCacheDir: tokenCacheDir,
+			issuerURL:     sv.IssuerURL(),
+			httpDriver:    httpdriver.New(ctx, t, nil),
+			now:           now,
+			stdout:        &stdout,
+			args: []string{
+				"--oidc-extra-scope", "email",
+				"--oidc-extra-scope", "profile",
+			},
+		})
+		assertCredentialPluginStdout(t, &stdout, sv.LastTokenResponse().IDToken, now.Add(time.Hour))
+	})

-		provider := mock_idp.NewMockProvider(ctrl)
-		serverURL, server := localserver.Start(t, idp.NewHandler(t, provider), tc.Keys)
-		defer server.Shutdown(t, ctx)
-		var idToken string
-		setupAuthCodeFlow(t, provider, serverURL, "email profile openid", &idToken)
-		writerMock := newCredentialPluginWriterMock(t, ctrl, &idToken)
-		browserMock := newBrowserMock(ctx, t, ctrl, tc.Keys)
+	t.Run("RedirectURLHostname", func(t *testing.T) {
+		t.Parallel()
+		ctx, cancel := context.WithTimeout(context.TODO(), timeout)
+		defer cancel()
+		sv := oidcserver.New(t, keypair.None, oidcserver.Config{
+			Want: oidcserver.Want{
+				Scope:             "openid",
+				RedirectURIPrefix: "http://127.0.0.1:",
+			},
+			Response: oidcserver.Response{
+				IDTokenExpiry: now.Add(time.Hour),
+			},
+		})
+		defer sv.Shutdown(t, ctx)
+		var stdout bytes.Buffer
+		runGetToken(t, ctx, getTokenConfig{
+			tokenCacheDir: tokenCacheDir,
+			issuerURL:     sv.IssuerURL(),
+			httpDriver:    httpdriver.New(ctx, t, nil),
+			now:           now,
+			stdout:        &stdout,
+			args:          []string{"--oidc-redirect-url-hostname", "127.0.0.1"},
+		})
+		assertCredentialPluginStdout(t, &stdout, sv.LastTokenResponse().IDToken, now.Add(time.Hour))
+	})

-		args := []string{
-			"--oidc-issuer-url", serverURL,
-			"--oidc-client-id", "kubernetes",
-			"--oidc-extra-scope", "email",
-			"--oidc-extra-scope", "profile",
-		}
-		args = append(args, tc.ExtraArgs...)
-		runGetTokenCmd(t, ctx, browserMock, writerMock, args)
+	t.Run("ExtraParams", func(t *testing.T) {
+		t.Parallel()
+		ctx, cancel := context.WithTimeout(context.TODO(), timeout)
+		defer cancel()
+		sv := oidcserver.New(t, keypair.None, oidcserver.Config{
+			Want: oidcserver.Want{
+				Scope:             "openid",
+				RedirectURIPrefix: "http://localhost:",
+				ExtraParams: map[string]string{
+					"ttl":    "86400",
+					"reauth": "false",
+				},
+			},
+			Response: oidcserver.Response{
+				IDTokenExpiry: now.Add(time.Hour),
+			},
+		})
+		defer sv.Shutdown(t, ctx)
+		var stdout bytes.Buffer
+		runGetToken(t, ctx, getTokenConfig{
+			tokenCacheDir: tokenCacheDir,
+			issuerURL:     sv.IssuerURL(),
+			httpDriver:    httpdriver.New(ctx, t, nil),
+			now:           now,
+			stdout:        &stdout,
+			args: []string{
+				"--oidc-auth-request-extra-params", "ttl=86400",
+				"--oidc-auth-request-extra-params", "reauth=false",
+			},
+		})
+		assertCredentialPluginStdout(t, &stdout, sv.LastTokenResponse().IDToken, now.Add(time.Hour))
 	})
 }

-func newCredentialPluginWriterMock(t *testing.T, ctrl *gomock.Controller, idToken *string) *mock_credentialpluginwriter.MockInterface {
-	writer := mock_credentialpluginwriter.NewMockInterface(ctrl)
-	writer.EXPECT().
-		Write(gomock.Any()).
-		Do(func(got credentialpluginwriter.Output) {
-			want := credentialpluginwriter.Output{
-				Token:  *idToken,
-				Expiry: tokenExpiryFuture,
-			}
-			if diff := cmp.Diff(want, got); diff != "" {
-				t.Errorf("mismatch (-want +got):\n%s", diff)
-			}
-		})
-	return writer
+type getTokenConfig struct {
+	tokenCacheDir string
+	issuerURL     string
+	httpDriver    browser.Interface
+	stdout        io.Writer
+	now           time.Time
+	args          []string
 }

-func runGetTokenCmd(t *testing.T, ctx context.Context, b browser.Interface, w credentialpluginwriter.Interface, args []string) {
-	t.Helper()
-	cmd := di.NewCmdForHeadless(mock_logger.New(t), b, w)
+func runGetToken(t *testing.T, ctx context.Context, cfg getTokenConfig) {
+	cmd := di.NewCmdForHeadless(clock.Fake(cfg.now), os.Stdin, cfg.stdout, logger.New(t), cfg.httpDriver)
 	exitCode := cmd.Run(ctx, append([]string{
-		"kubelogin", "get-token",
-		"--v=1",
+		"kubelogin",
+		"get-token",
+		"--token-cache-dir", cfg.tokenCacheDir,
+		"--oidc-issuer-url", cfg.issuerURL,
+		"--oidc-client-id", "kubernetes",
 		"--listen-address", "127.0.0.1:0",
-	}, args...), "HEAD")
+	}, cfg.args...), "latest")
 	if exitCode != 0 {
 		t.Errorf("exit status wants 0 but %d", exitCode)
 	}
 }

-func setupTokenCache(t *testing.T, tc credentialPluginTestCase, serverURL string, v tokencache.Value) {
-	k := tc.TokenCacheKey
-	k.IssuerURL = serverURL
-	k.ClientID = "kubernetes"
-	var r tokencache.Repository
-	err := r.Save(tc.TokenCacheDir, k, v)
-	if err != nil {
-		t.Errorf("could not set up the token cache: %s", err)
-	}
-}
-
-func assertTokenCache(t *testing.T, tc credentialPluginTestCase, serverURL string, want tokencache.Value) {
-	k := tc.TokenCacheKey
-	k.IssuerURL = serverURL
-	k.ClientID = "kubernetes"
-	var r tokencache.Repository
-	got, err := r.FindByKey(tc.TokenCacheDir, k)
-	if err != nil {
-		t.Errorf("could not set up the token cache: %s", err)
-	}
-	if diff := cmp.Diff(&want, got); diff != "" {
-		t.Errorf("mismatch (-want +got):\n%s", diff)
+func assertCredentialPluginStdout(t *testing.T, stdout io.Reader, token string, expiry time.Time) {
+	var got clientauthenticationv1beta1.ExecCredential
+	if err := json.NewDecoder(stdout).Decode(&got); err != nil {
+		t.Errorf("could not decode json of the credential plugin: %s", err)
+		return
+	}
+	want := clientauthenticationv1beta1.ExecCredential{
+		TypeMeta: metav1.TypeMeta{
+			APIVersion: "client.authentication.k8s.io/v1beta1",
+			Kind:       "ExecCredential",
+		},
+		Status: &clientauthenticationv1beta1.ExecCredentialStatus{
+			Token:               token,
+			ExpirationTimestamp: &metav1.Time{Time: expiry},
+		},
+	}
+	if diff := cmp.Diff(want, got); diff != "" {
+		t.Errorf("kubeconfig mismatch (-want +got):\n%s", diff)
 	}
 }
--- a/integration_test/helpers_test.go
+++ b/integration_test/helpers_test.go
@@ -1,93 +0,0 @@
-package integration_test
-
-import (
-	"context"
-	"net/http"
-	"testing"
-	"time"
-
-	"github.com/dgrijalva/jwt-go"
-	"github.com/golang/mock/gomock"
-	"github.com/int128/kubelogin/integration_test/idp"
-	"github.com/int128/kubelogin/integration_test/idp/mock_idp"
-	"github.com/int128/kubelogin/integration_test/keys"
-	"github.com/int128/kubelogin/pkg/adaptors/browser"
-	"github.com/int128/kubelogin/pkg/adaptors/browser/mock_browser"
-)
-
-var (
-	tokenExpiryFuture = time.Now().Add(time.Hour).Round(time.Second)
-	tokenExpiryPast   = time.Now().Add(-time.Hour).Round(time.Second)
-)
-
-func newIDToken(t *testing.T, issuer, nonce string, expiry time.Time) string {
-	t.Helper()
-	var claims struct {
-		jwt.StandardClaims
-		Nonce  string   `json:"nonce"`
-		Groups []string `json:"groups"`
-	}
-	claims.StandardClaims = jwt.StandardClaims{
-		Issuer:    issuer,
-		Audience:  "kubernetes",
-		Subject:   "SUBJECT",
-		IssuedAt:  time.Now().Unix(),
-		ExpiresAt: expiry.Unix(),
-	}
-	claims.Nonce = nonce
-	claims.Groups = []string{"admin", "users"}
-	token := jwt.NewWithClaims(jwt.SigningMethodRS256, claims)
-	s, err := token.SignedString(keys.JWSKeyPair)
-	if err != nil {
-		t.Fatalf("Could not sign the claims: %s", err)
-	}
-	return s
-}
-
-func setupAuthCodeFlow(t *testing.T, provider *mock_idp.MockProvider, serverURL, scope string, idToken *string) {
-	var nonce string
-	provider.EXPECT().Discovery().Return(idp.NewDiscoveryResponse(serverURL))
-	provider.EXPECT().GetCertificates().Return(idp.NewCertificatesResponse(keys.JWSKeyPair))
-	provider.EXPECT().AuthenticateCode(scope, gomock.Any()).
-		DoAndReturn(func(_, gotNonce string) (string, error) {
-			nonce = gotNonce
-			return "YOUR_AUTH_CODE", nil
-		})
-	provider.EXPECT().Exchange("YOUR_AUTH_CODE").
-		DoAndReturn(func(string) (*idp.TokenResponse, error) {
-			*idToken = newIDToken(t, serverURL, nonce, tokenExpiryFuture)
-			return idp.NewTokenResponse(*idToken, "YOUR_REFRESH_TOKEN"), nil
-		})
-}
-
-func setupROPCFlow(provider *mock_idp.MockProvider, serverURL, scope, username, password, idToken string) {
-	provider.EXPECT().Discovery().Return(idp.NewDiscoveryResponse(serverURL))
-	provider.EXPECT().GetCertificates().Return(idp.NewCertificatesResponse(keys.JWSKeyPair))
-	provider.EXPECT().AuthenticatePassword(username, password, scope).
-		Return(idp.NewTokenResponse(idToken, "YOUR_REFRESH_TOKEN"), nil)
-}
-
-func newBrowserMock(ctx context.Context, t *testing.T, ctrl *gomock.Controller, k keys.Keys) browser.Interface {
-	b := mock_browser.NewMockInterface(ctrl)
-	b.EXPECT().
-		Open(gomock.Any()).
-		Do(func(url string) {
-			client := http.Client{Transport: &http.Transport{TLSClientConfig: k.TLSConfig}}
-			req, err := http.NewRequest("GET", url, nil)
-			if err != nil {
-				t.Errorf("could not create a request: %s", err)
-				return
-			}
-			req = req.WithContext(ctx)
-			resp, err := client.Do(req)
-			if err != nil {
-				t.Errorf("could not send a request: %s", err)
-				return
-			}
-			defer resp.Body.Close()
-			if resp.StatusCode != 200 {
-				t.Errorf("StatusCode wants 200 but %d", resp.StatusCode)
-			}
-		})
-	return b
-}
--- a/integration_test/httpdriver/http_driver.go
+++ b/integration_test/httpdriver/http_driver.go
@@ -0,0 +1,54 @@
+// Package httpdriver provides a test double of the browser.
+package httpdriver
+
+import (
+	"context"
+	"crypto/tls"
+	"net/http"
+	"testing"
+)
+
+// New returns a client to simulate browser access.
+func New(ctx context.Context, t *testing.T, tlsConfig *tls.Config) *client {
+	return &client{ctx, t, tlsConfig}
+}
+
+// Zero returns a client which call is not expected.
+func Zero(t *testing.T) *zeroClient {
+	return &zeroClient{t}
+}
+
+type client struct {
+	ctx       context.Context
+	t         *testing.T
+	tlsConfig *tls.Config
+}
+
+func (c *client) Open(url string) error {
+	client := http.Client{Transport: &http.Transport{TLSClientConfig: c.tlsConfig}}
+	req, err := http.NewRequest("GET", url, nil)
+	if err != nil {
+		c.t.Errorf("could not create a request: %s", err)
+		return nil
+	}
+	req = req.WithContext(c.ctx)
+	resp, err := client.Do(req)
+	if err != nil {
+		c.t.Errorf("could not send a request: %s", err)
+		return nil
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode != 200 {
+		c.t.Errorf("StatusCode wants 200 but %d", resp.StatusCode)
+	}
+	return nil
+}
+
+type zeroClient struct {
+	t *testing.T
+}
+
+func (c *zeroClient) Open(url string) error {
+	c.t.Errorf("unexpected function call Open(%s)", url)
+	return nil
+}
--- a/integration_test/idp/mock_idp/mock_idp.go
+++ b/integration_test/idp/mock_idp/mock_idp.go
@@ -1,122 +0,0 @@
-// Code generated by MockGen. DO NOT EDIT.
-// Source: github.com/int128/kubelogin/e2e_test/idp (interfaces: Provider)
-
-// Package mock_idp is a generated GoMock package.
-package mock_idp
-
-import (
-	gomock "github.com/golang/mock/gomock"
-	idp "github.com/int128/kubelogin/integration_test/idp"
-	reflect "reflect"
-)
-
-// MockProvider is a mock of Provider interface
-type MockProvider struct {
-	ctrl     *gomock.Controller
-	recorder *MockProviderMockRecorder
-}
-
-// MockProviderMockRecorder is the mock recorder for MockProvider
-type MockProviderMockRecorder struct {
-	mock *MockProvider
-}
-
-// NewMockProvider creates a new mock instance
-func NewMockProvider(ctrl *gomock.Controller) *MockProvider {
-	mock := &MockProvider{ctrl: ctrl}
-	mock.recorder = &MockProviderMockRecorder{mock}
-	return mock
-}
-
-// EXPECT returns an object that allows the caller to indicate expected use
-func (m *MockProvider) EXPECT() *MockProviderMockRecorder {
-	return m.recorder
-}
-
-// AuthenticateCode mocks base method
-func (m *MockProvider) AuthenticateCode(arg0, arg1 string) (string, error) {
-	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "AuthenticateCode", arg0, arg1)
-	ret0, _ := ret[0].(string)
-	ret1, _ := ret[1].(error)
-	return ret0, ret1
-}
-
-// AuthenticateCode indicates an expected call of AuthenticateCode
-func (mr *MockProviderMockRecorder) AuthenticateCode(arg0, arg1 interface{}) *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "AuthenticateCode", reflect.TypeOf((*MockProvider)(nil).AuthenticateCode), arg0, arg1)
-}
-
-// AuthenticatePassword mocks base method
-func (m *MockProvider) AuthenticatePassword(arg0, arg1, arg2 string) (*idp.TokenResponse, error) {
-	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "AuthenticatePassword", arg0, arg1, arg2)
-	ret0, _ := ret[0].(*idp.TokenResponse)
-	ret1, _ := ret[1].(error)
-	return ret0, ret1
-}
-
-// AuthenticatePassword indicates an expected call of AuthenticatePassword
-func (mr *MockProviderMockRecorder) AuthenticatePassword(arg0, arg1, arg2 interface{}) *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "AuthenticatePassword", reflect.TypeOf((*MockProvider)(nil).AuthenticatePassword), arg0, arg1, arg2)
-}
-
-// Discovery mocks base method
-func (m *MockProvider) Discovery() *idp.DiscoveryResponse {
-	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "Discovery")
-	ret0, _ := ret[0].(*idp.DiscoveryResponse)
-	return ret0
-}
-
-// Discovery indicates an expected call of Discovery
-func (mr *MockProviderMockRecorder) Discovery() *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Discovery", reflect.TypeOf((*MockProvider)(nil).Discovery))
-}
-
-// Exchange mocks base method
-func (m *MockProvider) Exchange(arg0 string) (*idp.TokenResponse, error) {
-	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "Exchange", arg0)
-	ret0, _ := ret[0].(*idp.TokenResponse)
-	ret1, _ := ret[1].(error)
-	return ret0, ret1
-}
-
-// Exchange indicates an expected call of Exchange
-func (mr *MockProviderMockRecorder) Exchange(arg0 interface{}) *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Exchange", reflect.TypeOf((*MockProvider)(nil).Exchange), arg0)
-}
-
-// GetCertificates mocks base method
-func (m *MockProvider) GetCertificates() *idp.CertificatesResponse {
-	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "GetCertificates")
-	ret0, _ := ret[0].(*idp.CertificatesResponse)
-	return ret0
-}
-
-// GetCertificates indicates an expected call of GetCertificates
-func (mr *MockProviderMockRecorder) GetCertificates() *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "GetCertificates", reflect.TypeOf((*MockProvider)(nil).GetCertificates))
-}
-
-// Refresh mocks base method
-func (m *MockProvider) Refresh(arg0 string) (*idp.TokenResponse, error) {
-	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "Refresh", arg0)
-	ret0, _ := ret[0].(*idp.TokenResponse)
-	ret1, _ := ret[1].(error)
-	return ret0, ret1
-}
-
-// Refresh indicates an expected call of Refresh
-func (mr *MockProviderMockRecorder) Refresh(arg0 interface{}) *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Refresh", reflect.TypeOf((*MockProvider)(nil).Refresh), arg0)
-}
--- a/integration_test/keypair/keypair.go
+++ b/integration_test/keypair/keypair.go
@@ -0,0 +1,62 @@
+package keypair
+
+import (
+	"crypto/tls"
+	"crypto/x509"
+	"encoding/base64"
+	"io"
+	"io/ioutil"
+	"os"
+	"strings"
+)
+
+// KeyPair represents a pair of certificate and key.
+type KeyPair struct {
+	CertPath     string
+	KeyPath      string
+	CACertPath   string
+	CACertBase64 string
+	TLSConfig    *tls.Config
+}
+
+// None represents non-TLS.
+var None KeyPair
+
+// Server is a KeyPair for TLS server.
+// These files should be generated by Makefile before test.
+var Server = KeyPair{
+	CertPath:     "keypair/testdata/server.crt",
+	KeyPath:      "keypair/testdata/server.key",
+	CACertPath:   "keypair/testdata/ca.crt",
+	CACertBase64: readAsBase64("keypair/testdata/ca.crt"),
+	TLSConfig:    newTLSConfig("keypair/testdata/ca.crt"),
+}
+
+func readAsBase64(name string) string {
+	f, err := os.Open(name)
+	if err != nil {
+		panic(err)
+	}
+	defer f.Close()
+	var s strings.Builder
+	e := base64.NewEncoder(base64.StdEncoding, &s)
+	if _, err := io.Copy(e, f); err != nil {
+		panic(err)
+	}
+	if err := e.Close(); err != nil {
+		panic(err)
+	}
+	return s.String()
+}
+
+func newTLSConfig(name string) *tls.Config {
+	b, err := ioutil.ReadFile(name)
+	if err != nil {
+		panic(err)
+	}
+	p := x509.NewCertPool()
+	if !p.AppendCertsFromPEM(b) {
+		panic("could not append the CA cert")
+	}
+	return &tls.Config{RootCAs: p}
+}
--- a/integration_test/keypair/testdata/Makefile
+++ b/integration_test/keypair/testdata/Makefile
@@ -4,7 +4,6 @@ TARGETS := ca.key
 TARGETS += ca.crt
 TARGETS += server.key
 TARGETS += server.crt
-TARGETS += jws.key

 .PHONY: all
 all: $(TARGETS)
@@ -22,9 +21,6 @@ server.csr: openssl.cnf server.key
 server.crt: openssl.cnf server.csr ca.crt ca.key
 	openssl x509 -req -in server.csr -CA ca.crt -CAkey ca.key -CAcreateserial -out $@ -sha256 -days $(EXPIRY) -extensions v3_req -extfile openssl.cnf

-jws.key:
-	openssl genrsa -out $@ 2048
-
 .PHONY: clean
 clean:
 	-rm -v $(TARGETS)
--- a/integration_test/keypair/testdata/ca.crt
+++ b/integration_test/keypair/testdata/ca.crt
--- a/integration_test/keypair/testdata/ca.csr
+++ b/integration_test/keypair/testdata/ca.csr
--- a/integration_test/keypair/testdata/ca.key
+++ b/integration_test/keypair/testdata/ca.key
--- a/integration_test/keypair/testdata/ca.srl
+++ b/integration_test/keypair/testdata/ca.srl
--- a/integration_test/keypair/testdata/openssl.cnf
+++ b/integration_test/keypair/testdata/openssl.cnf
--- a/integration_test/keypair/testdata/server.crt
+++ b/integration_test/keypair/testdata/server.crt
--- a/integration_test/keypair/testdata/server.csr
+++ b/integration_test/keypair/testdata/server.csr
--- a/integration_test/keypair/testdata/server.key
+++ b/integration_test/keypair/testdata/server.key
--- a/integration_test/keys/keys.go
+++ b/integration_test/keys/keys.go
@@ -1,90 +0,0 @@
-package keys
-
-import (
-	"crypto/rsa"
-	"crypto/tls"
-	"crypto/x509"
-	"encoding/base64"
-	"encoding/pem"
-	"io"
-	"io/ioutil"
-	"os"
-	"strings"
-)
-
-// Keys represents a pair of certificate and key.
-type Keys struct {
-	CertPath     string
-	KeyPath      string
-	CACertPath   string
-	CACertBase64 string
-	TLSConfig    *tls.Config
-}
-
-// None represents non-TLS.
-var None Keys
-
-// Server is a Keys for TLS server.
-// These files should be generated by Makefile before test.
-var Server = Keys{
-	CertPath:     "keys/testdata/server.crt",
-	KeyPath:      "keys/testdata/server.key",
-	CACertPath:   "keys/testdata/ca.crt",
-	CACertBase64: readAsBase64("keys/testdata/ca.crt"),
-	TLSConfig:    newTLSConfig("keys/testdata/ca.crt"),
-}
-
-// JWSKey is path to the key for signing ID tokens.
-// This file should be generated by Makefile before test.
-const JWSKey = "keys/testdata/jws.key"
-
-// JWSKeyPair is the key pair loaded from JWSKey.
-var JWSKeyPair = readPrivateKey(JWSKey)
-
-func readAsBase64(name string) string {
-	f, err := os.Open(name)
-	if err != nil {
-		panic(err)
-	}
-	defer f.Close()
-	var s strings.Builder
-	e := base64.NewEncoder(base64.StdEncoding, &s)
-	if _, err := io.Copy(e, f); err != nil {
-		panic(err)
-	}
-	if err := e.Close(); err != nil {
-		panic(err)
-	}
-	return s.String()
-}
-
-func newTLSConfig(name string) *tls.Config {
-	b, err := ioutil.ReadFile(name)
-	if err != nil {
-		panic(err)
-	}
-	p := x509.NewCertPool()
-	if !p.AppendCertsFromPEM(b) {
-		panic("could not append the CA cert")
-	}
-	return &tls.Config{RootCAs: p}
-}
-
-func readPrivateKey(name string) *rsa.PrivateKey {
-	b, err := ioutil.ReadFile(name)
-	if err != nil {
-		panic(err)
-	}
-	block, rest := pem.Decode(b)
-	if block == nil {
-		panic("could not decode PEM")
-	}
-	if len(rest) > 0 {
-		panic("PEM should contain single key but multiple keys")
-	}
-	k, err := x509.ParsePKCS1PrivateKey(block.Bytes)
-	if err != nil {
-		panic(err)
-	}
-	return k
-}
--- a/integration_test/keys/testdata/jws.key
+++ b/integration_test/keys/testdata/jws.key
@@ -1,27 +0,0 @@
-----BEGIN RSA PRIVATE KEY-----
-MIIEowIBAAKCAQEAvKJxjhaEnV/64i+GBDn4+PUno693bQBumE6a/pUf5RC8faZu
-dpj7vFJsTPHqHNqR5EIKCGZMlYvnxXbOJDElqbDkRtFG4l3k/WXAea5rE4v+AKDm
-/49dY6SLgH7iP2Z2gmgbqICjDFyn89Mye3H4ZEY0dHiY/7Fbhg637+aaE/CkPNue
-LFn3UjqmytkxiBhLX8H6zQU6RP6IVFpSjuJ6TfRVvJ4lg1ThxX+rKqUDzIdF2FNe
-1KBYfEKV1J9ZY671qrV07H8jw42Kw8/hmGECb1hr93JOu0odWM6EhXhig3oL299c
-2jlQAh4y04uUybS6xYhZxrk6FcpzzaJO/eRPHQIDAQABAoIBABhtlPUIl33l2xCF
-hP5xH3vmC48X/wg/oRLaQxoq56l7ZF2FOxLitt7pcZr5TQ8VgwUjRDdYQByxtH8O
-5p0rPCxgev9sxJg1/pyOG8HmQ3mRjIA6Vg/MWhS4T1SBmf0J4Nj8cHB+0B6etSVP
-OV9hIACkUtCueWnLZwXSTCGmJFfmfeKQSM3yyF3BxQDpyAQFdzCbIwQsTmSnZOZx
-5wJ8Fv/BMrqKBje158ISePBZWz54eBnFc2VKKDRxj16e5Ni0BhCwpgDI7MRUzKVS
-qKAkCwsUcmXpRZPUU5mDB6yPJU8DZwTcS5L1PWUIUnY3mlosukVUxTaoJigwulr9
-RXp9tmUCgYEA6x40cnT2sibSPuytycs4Tpg5UjeCkPMNCscX+x9hdSWjJkC7eolH
-qTHemjC896ExTMMFzpFKjymJbdeMn6BslOt6RvHnXugJ8IRi10JgZYHFQ/hr6A3+
-SsPA7cT712Ya63i19WWCySYDccy33qGt2rtdhJlrGKEfnTiNjEMw1hMCgYEAzWNc
-ae/tWbmYhjEoFt/pJp1Lb/zIDRpjV4zfeyr/wPY9Q0d/llKUISPdi1slQxpNTHqT
-idiRnc8Qweisqt+84UiTU9JEG7D3T71SA+MO57NIm2wTt/7U7yb3abMZZijIPw5U
-6td5jh78dGT3WRPgAsGnACXA2WJchD5m0nthrA8CgYEAiCMeJSPab/8Qf8TVP+G+
-gaucjSF9JWbGJ3ZuSUa7THR1ikGzDFmOt8YbaVZNJGkePZ8yro/sBwb6/zHux8LA
-/F14mLmayZY7oxtUi+VwIXZJfXjLKjtoAWxlOodzdx40+iET4rpbRxMOrYbm9C7T
-lrIkjRG0NDefMY68TvncvicCgYBNtkO4PbTj1yqT07OkfBI+rxNlCxMyigJ+lOnW
-M53TiBgEBeCLozEzHNvtp44AxsnqnxKF/LCUMk3X4M68VK2l3A0KkSt+AsaAoFSQ
-7e+s0ZQuYoVPgBdXaboBf2ej1Nh3q1eMB/2RPb4t2CoSxUdkI5upnZ9LYUE6NFY5
-W7/IFwKBgAdQxrwfQmXqtuHwiorfCm3AS/w5xmGjbBTPHnZWme2zrmFTOKSWsxAs
-XAVU9B+RXJsPehC84SEreHtmZi79RRxHZOZhrl4oxrYth83QuzsR546kJwadBOj0
-91yAjrekXHI3YHFQJRFUBvlswgZKDiqP74DSBbmXwfO/h2wNUYyZ
-----END RSA PRIVATE KEY-----
--- a/integration_test/oidcserver/handler/handler.go
+++ b/integration_test/oidcserver/handler/handler.go
@@ -1,4 +1,5 @@
-package idp
+// Package handler provides a HTTP handler for the OpenID Connect Provider.
+package handler

 import (
 	"encoding/json"
@@ -9,7 +10,7 @@ import (
 	"golang.org/x/xerrors"
 )

-func NewHandler(t *testing.T, provider Provider) *Handler {
+func New(t *testing.T, provider Provider) *Handler {
 	return &Handler{t, provider}
 }

@@ -71,11 +72,17 @@ func (h *Handler) serveHTTP(w http.ResponseWriter, r *http.Request) error {
 			return xerrors.Errorf("could not render json: %w", err)
 		}
 	case m == "GET" && p == "/auth":
-		// 3.1.2.1. Authentication Request
-		// https://openid.net/specs/openid-connect-core-1_0.html#AuthRequest
 		q := r.URL.Query()
-		redirectURI, scope, state, nonce := q.Get("redirect_uri"), q.Get("scope"), q.Get("state"), q.Get("nonce")
-		code, err := h.provider.AuthenticateCode(scope, nonce)
+		redirectURI, state := q.Get("redirect_uri"), q.Get("state")
+		code, err := h.provider.AuthenticateCode(AuthenticationRequest{
+			RedirectURI:         redirectURI,
+			State:               state,
+			Scope:               q.Get("scope"),
+			Nonce:               q.Get("nonce"),
+			CodeChallenge:       q.Get("code_challenge"),
+			CodeChallengeMethod: q.Get("code_challenge_method"),
+			RawQuery:            q,
+		})
 		if err != nil {
 			return xerrors.Errorf("authentication error: %w", err)
 		}
@@ -88,10 +95,10 @@ func (h *Handler) serveHTTP(w http.ResponseWriter, r *http.Request) error {
 		grantType := r.Form.Get("grant_type")
 		switch grantType {
 		case "authorization_code":
-			// 3.1.3.1. Token Request
-			// https://openid.net/specs/openid-connect-core-1_0.html#TokenRequest
-			code := r.Form.Get("code")
-			tokenResponse, err := h.provider.Exchange(code)
+			tokenResponse, err := h.provider.Exchange(TokenRequest{
+				Code:         r.Form.Get("code"),
+				CodeVerifier: r.Form.Get("code_verifier"),
+			})
 			if err != nil {
 				return xerrors.Errorf("token request error: %w", err)
 			}
--- a/integration_test/oidcserver/handler/types.go
+++ b/integration_test/oidcserver/handler/types.go
@@ -1,13 +1,8 @@
-// Package idp provides a test double of an OpenID Connect Provider.
-package idp
-
-//go:generate mockgen -destination mock_idp/mock_idp.go github.com/int128/kubelogin/e2e_test/idp Provider
+package handler

 import (
-	"crypto/rsa"
-	"encoding/base64"
 	"fmt"
-	"math/big"
+	"net/url"
 )

 // Provider provides discovery and authentication methods.
@@ -17,8 +12,8 @@ import (
 type Provider interface {
 	Discovery() *DiscoveryResponse
 	GetCertificates() *CertificatesResponse
-	AuthenticateCode(scope, nonce string) (code string, err error)
-	Exchange(code string) (*TokenResponse, error)
+	AuthenticateCode(req AuthenticationRequest) (code string, err error)
+	Exchange(req TokenRequest) (*TokenResponse, error)
 	AuthenticatePassword(username, password, scope string) (*TokenResponse, error)
 	Refresh(refreshToken string) (*TokenResponse, error)
 }
@@ -39,26 +34,6 @@ type DiscoveryResponse struct {
 	CodeChallengeMethodsSupported     []string `json:"code_challenge_methods_supported"`
 }

-// NewDiscoveryResponse returns a DiscoveryResponse for the local server.
-// This is based on https://accounts.google.com/.well-known/openid-configuration.
-func NewDiscoveryResponse(issuer string) *DiscoveryResponse {
-	return &DiscoveryResponse{
-		Issuer:                            issuer,
-		AuthorizationEndpoint:             issuer + "/auth",
-		TokenEndpoint:                     issuer + "/token",
-		JwksURI:                           issuer + "/certs",
-		UserinfoEndpoint:                  issuer + "/userinfo",
-		RevocationEndpoint:                issuer + "/revoke",
-		ResponseTypesSupported:            []string{"code id_token"},
-		SubjectTypesSupported:             []string{"public"},
-		IDTokenSigningAlgValuesSupported:  []string{"RS256"},
-		ScopesSupported:                   []string{"openid", "email", "profile"},
-		TokenEndpointAuthMethodsSupported: []string{"client_secret_post", "client_secret_basic"},
-		CodeChallengeMethodsSupported:     []string{"plain", "S256"},
-		ClaimsSupported:                   []string{"aud", "email", "exp", "iat", "iss", "name", "sub"},
-	}
-}
-
 type CertificatesResponse struct {
 	Keys []*CertificatesResponseKey `json:"keys"`
 }
@@ -72,21 +47,23 @@ type CertificatesResponseKey struct {
 	E   string `json:"e"`
 }

-// NewCertificatesResponse returns a CertificatesResponse using the key pair.
-// This is used for verifying a signature of ID token.
-func NewCertificatesResponse(idTokenKeyPair *rsa.PrivateKey) *CertificatesResponse {
-	return &CertificatesResponse{
-		Keys: []*CertificatesResponseKey{
-			{
-				Kty: "RSA",
-				Alg: "RS256",
-				Use: "sig",
-				Kid: "dummy",
-				E:   base64.RawURLEncoding.EncodeToString(big.NewInt(int64(idTokenKeyPair.E)).Bytes()),
-				N:   base64.RawURLEncoding.EncodeToString(idTokenKeyPair.N.Bytes()),
-			},
-		},
-	}
+// AuthenticationRequest represents a type of:
+// https://openid.net/specs/openid-connect-core-1_0.html#AuthRequest
+type AuthenticationRequest struct {
+	RedirectURI         string
+	State               string
+	Scope               string // space separated string
+	Nonce               string
+	CodeChallenge       string
+	CodeChallengeMethod string
+	RawQuery            url.Values
+}
+
+// TokenRequest represents a type of:
+// https://openid.net/specs/openid-connect-core-1_0.html#TokenRequest
+type TokenRequest struct {
+	Code         string
+	CodeVerifier string
 }

 type TokenResponse struct {
@@ -97,17 +74,6 @@ type TokenResponse struct {
 	IDToken      string `json:"id_token"`
 }

-// NewTokenResponse returns a TokenResponse.
-func NewTokenResponse(idToken, refreshToken string) *TokenResponse {
-	return &TokenResponse{
-		TokenType:    "Bearer",
-		ExpiresIn:    3600,
-		AccessToken:  "YOUR_ACCESS_TOKEN",
-		IDToken:      idToken,
-		RefreshToken: refreshToken,
-	}
-}
-
 // ErrorResponse represents an error response described in the following section:
 // 5.2 Error Response
 // https://tools.ietf.org/html/rfc6749#section-5.2
--- a/integration_test/localserver/authserver.go
+++ b/integration_test/localserver/authserver.go
@@ -1,7 +1,5 @@
-// Package localserver provides a http server running on localhost.
-// This is only for testing.
-//
-package localserver
+// Package http provides a http server running on localhost for testing.
+package http

 import (
 	"context"
@@ -9,7 +7,7 @@ import (
 	"net/http"
 	"testing"

-	"github.com/int128/kubelogin/integration_test/keys"
+	"github.com/int128/kubelogin/integration_test/keypair"
 )

 type Shutdowner interface {
@@ -17,28 +15,23 @@ type Shutdowner interface {
 }

 type shutdowner struct {
-	l net.Listener
 	s *http.Server
 }

 func (s *shutdowner) Shutdown(t *testing.T, ctx context.Context) {
-	// s.Shutdown() closes the lister as well,
-	// so we do not need to call l.Close() explicitly
 	if err := s.s.Shutdown(ctx); err != nil {
-		t.Errorf("Could not shutdown the server: %s", err)
+		t.Errorf("could not shutdown the server: %s", err)
 	}
 }

-// Start starts an authentication server.
-// If k is non-nil, it starts a TLS server.
-func Start(t *testing.T, h http.Handler, k keys.Keys) (string, Shutdowner) {
-	if k == keys.None {
+func Start(t *testing.T, h http.Handler, k keypair.KeyPair) (string, Shutdowner) {
+	if k == keypair.None {
 		return startNoTLS(t, h)
 	}
 	return startTLS(t, h, k)
 }

-func startNoTLS(t *testing.T, h http.Handler) (string, Shutdowner) {
+func startNoTLS(t *testing.T, h http.Handler) (string, *shutdowner) {
 	t.Helper()
 	l, port := newLocalhostListener(t)
 	url := "http://localhost:" + port
@@ -51,10 +44,10 @@ func startNoTLS(t *testing.T, h http.Handler) (string, Shutdowner) {
 			t.Error(err)
 		}
 	}()
-	return url, &shutdowner{l, s}
+	return url, &shutdowner{s}
 }

-func startTLS(t *testing.T, h http.Handler, k keys.Keys) (string, Shutdowner) {
+func startTLS(t *testing.T, h http.Handler, k keypair.KeyPair) (string, *shutdowner) {
 	t.Helper()
 	l, port := newLocalhostListener(t)
 	url := "https://localhost:" + port
@@ -67,7 +60,7 @@ func startTLS(t *testing.T, h http.Handler, k keys.Keys) (string, Shutdowner) {
 			t.Error(err)
 		}
 	}()
-	return url, &shutdowner{l, s}
+	return url, &shutdowner{s}
 }

 func newLocalhostListener(t *testing.T) (net.Listener, string) {
--- a/integration_test/oidcserver/server.go
+++ b/integration_test/oidcserver/server.go
@@ -0,0 +1,217 @@
+// Package oidcserver provides a stub of OpenID Connect provider.
+package oidcserver
+
+import (
+	"crypto/sha256"
+	"encoding/base64"
+	"math/big"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/int128/kubelogin/integration_test/keypair"
+	"github.com/int128/kubelogin/integration_test/oidcserver/handler"
+	"github.com/int128/kubelogin/integration_test/oidcserver/http"
+	"github.com/int128/kubelogin/pkg/testing/jwt"
+	"golang.org/x/xerrors"
+)
+
+type Server interface {
+	http.Shutdowner
+	IssuerURL() string
+	SetConfig(Config)
+	LastTokenResponse() *handler.TokenResponse
+}
+
+// Want represents a set of expected values.
+type Want struct {
+	Scope               string
+	RedirectURIPrefix   string
+	CodeChallengeMethod string            // optional
+	ExtraParams         map[string]string // optional
+	Username            string            // optional
+	Password            string            // optional
+	RefreshToken        string            // optional
+}
+
+// Response represents a set of response values.
+type Response struct {
+	IDTokenExpiry                 time.Time
+	RefreshToken                  string
+	RefreshError                  string   // if set, Refresh() will return the error
+	CodeChallengeMethodsSupported []string // optional
+}
+
+// Config represents a configuration of the OpenID Connect provider.
+type Config struct {
+	Want     Want
+	Response Response
+}
+
+// New starts a HTTP server for the OpenID Connect provider.
+func New(t *testing.T, k keypair.KeyPair, c Config) Server {
+	sv := server{Config: c, t: t}
+	sv.issuerURL, sv.Shutdowner = http.Start(t, handler.New(t, &sv), k)
+	return &sv
+}
+
+type server struct {
+	Config
+	http.Shutdowner
+	t                         *testing.T
+	issuerURL                 string
+	lastAuthenticationRequest *handler.AuthenticationRequest
+	lastTokenResponse         *handler.TokenResponse
+}
+
+func (sv *server) IssuerURL() string {
+	return sv.issuerURL
+}
+
+func (sv *server) SetConfig(cfg Config) {
+	sv.Config = cfg
+}
+
+func (sv *server) LastTokenResponse() *handler.TokenResponse {
+	return sv.lastTokenResponse
+}
+
+func (sv *server) Discovery() *handler.DiscoveryResponse {
+	// based on https://accounts.google.com/.well-known/openid-configuration
+	return &handler.DiscoveryResponse{
+		Issuer:                            sv.issuerURL,
+		AuthorizationEndpoint:             sv.issuerURL + "/auth",
+		TokenEndpoint:                     sv.issuerURL + "/token",
+		JwksURI:                           sv.issuerURL + "/certs",
+		UserinfoEndpoint:                  sv.issuerURL + "/userinfo",
+		RevocationEndpoint:                sv.issuerURL + "/revoke",
+		ResponseTypesSupported:            []string{"code id_token"},
+		SubjectTypesSupported:             []string{"public"},
+		IDTokenSigningAlgValuesSupported:  []string{"RS256"},
+		ScopesSupported:                   []string{"openid", "email", "profile"},
+		TokenEndpointAuthMethodsSupported: []string{"client_secret_post", "client_secret_basic"},
+		CodeChallengeMethodsSupported:     sv.Config.Response.CodeChallengeMethodsSupported,
+		ClaimsSupported:                   []string{"aud", "email", "exp", "iat", "iss", "name", "sub"},
+	}
+}
+
+func (sv *server) GetCertificates() *handler.CertificatesResponse {
+	idTokenKeyPair := jwt.PrivateKey
+	return &handler.CertificatesResponse{
+		Keys: []*handler.CertificatesResponseKey{
+			{
+				Kty: "RSA",
+				Alg: "RS256",
+				Use: "sig",
+				Kid: "dummy",
+				E:   base64.RawURLEncoding.EncodeToString(big.NewInt(int64(idTokenKeyPair.E)).Bytes()),
+				N:   base64.RawURLEncoding.EncodeToString(idTokenKeyPair.N.Bytes()),
+			},
+		},
+	}
+}
+
+func (sv *server) AuthenticateCode(req handler.AuthenticationRequest) (code string, err error) {
+	if req.Scope != sv.Want.Scope {
+		sv.t.Errorf("scope wants `%s` but was `%s`", sv.Want.Scope, req.Scope)
+	}
+	if !strings.HasPrefix(req.RedirectURI, sv.Want.RedirectURIPrefix) {
+		sv.t.Errorf("redirectURI wants prefix `%s` but was `%s`", sv.Want.RedirectURIPrefix, req.RedirectURI)
+	}
+	if req.CodeChallengeMethod != sv.Want.CodeChallengeMethod {
+		sv.t.Errorf("code_challenge_method wants `%s` but was `%s`", sv.Want.CodeChallengeMethod, req.CodeChallengeMethod)
+	}
+	for k, v := range sv.Want.ExtraParams {
+		got := req.RawQuery.Get(k)
+		if got != v {
+			sv.t.Errorf("parameter %s wants `%s` but was `%s`", k, v, got)
+		}
+	}
+	sv.lastAuthenticationRequest = &req
+	return "YOUR_AUTH_CODE", nil
+}
+
+func (sv *server) Exchange(req handler.TokenRequest) (*handler.TokenResponse, error) {
+	if req.Code != "YOUR_AUTH_CODE" {
+		return nil, xerrors.Errorf("code wants %s but was %s", "YOUR_AUTH_CODE", req.Code)
+	}
+	if sv.lastAuthenticationRequest.CodeChallengeMethod == "S256" {
+		// https://tools.ietf.org/html/rfc7636#section-4.6
+		challenge := computeS256Challenge(req.CodeVerifier)
+		if challenge != sv.lastAuthenticationRequest.CodeChallenge {
+			sv.t.Errorf("pkce S256 challenge did not match (want %s but was %s)", sv.lastAuthenticationRequest.CodeChallenge, challenge)
+		}
+	}
+	resp := &handler.TokenResponse{
+		TokenType:    "Bearer",
+		ExpiresIn:    3600,
+		AccessToken:  "YOUR_ACCESS_TOKEN",
+		RefreshToken: sv.Response.RefreshToken,
+		IDToken: jwt.EncodeF(sv.t, func(claims *jwt.Claims) {
+			claims.Issuer = sv.issuerURL
+			claims.Subject = "SUBJECT"
+			claims.IssuedAt = sv.Response.IDTokenExpiry.Add(-time.Hour).Unix()
+			claims.ExpiresAt = sv.Response.IDTokenExpiry.Unix()
+			claims.Audience = []string{"kubernetes"}
+			claims.Nonce = sv.lastAuthenticationRequest.Nonce
+		}),
+	}
+	sv.lastTokenResponse = resp
+	return resp, nil
+}
+
+func computeS256Challenge(verifier string) string {
+	c := sha256.Sum256([]byte(verifier))
+	return base64.URLEncoding.WithPadding(base64.NoPadding).EncodeToString(c[:])
+}
+
+func (sv *server) AuthenticatePassword(username, password, scope string) (*handler.TokenResponse, error) {
+	if scope != sv.Want.Scope {
+		sv.t.Errorf("scope wants `%s` but was `%s`", sv.Want.Scope, scope)
+	}
+	if username != sv.Want.Username {
+		sv.t.Errorf("username wants `%s` but was `%s`", sv.Want.Username, username)
+	}
+	if password != sv.Want.Password {
+		sv.t.Errorf("password wants `%s` but was `%s`", sv.Want.Password, password)
+	}
+	resp := &handler.TokenResponse{
+		TokenType:    "Bearer",
+		ExpiresIn:    3600,
+		AccessToken:  "YOUR_ACCESS_TOKEN",
+		RefreshToken: sv.Response.RefreshToken,
+		IDToken: jwt.EncodeF(sv.t, func(claims *jwt.Claims) {
+			claims.Issuer = sv.issuerURL
+			claims.Subject = "SUBJECT"
+			claims.IssuedAt = sv.Response.IDTokenExpiry.Add(-time.Hour).Unix()
+			claims.ExpiresAt = sv.Response.IDTokenExpiry.Unix()
+			claims.Audience = []string{"kubernetes"}
+		}),
+	}
+	sv.lastTokenResponse = resp
+	return resp, nil
+}
+
+func (sv *server) Refresh(refreshToken string) (*handler.TokenResponse, error) {
+	if refreshToken != sv.Want.RefreshToken {
+		sv.t.Errorf("refreshToken wants %s but was %s", sv.Want.RefreshToken, refreshToken)
+	}
+	if sv.Response.RefreshError != "" {
+		return nil, &handler.ErrorResponse{Code: "invalid_request", Description: sv.Response.RefreshError}
+	}
+	resp := &handler.TokenResponse{
+		TokenType:    "Bearer",
+		ExpiresIn:    3600,
+		AccessToken:  "YOUR_ACCESS_TOKEN",
+		RefreshToken: sv.Response.RefreshToken,
+		IDToken: jwt.EncodeF(sv.t, func(claims *jwt.Claims) {
+			claims.Issuer = sv.issuerURL
+			claims.Subject = "SUBJECT"
+			claims.IssuedAt = sv.Response.IDTokenExpiry.Add(-time.Hour).Unix()
+			claims.ExpiresAt = sv.Response.IDTokenExpiry.Unix()
+			claims.Audience = []string{"kubernetes"}
+		}),
+	}
+	sv.lastTokenResponse = resp
+	return resp, nil
+}
--- a/integration_test/standalone_test.go
+++ b/integration_test/standalone_test.go
@@ -6,16 +6,14 @@ import (
 	"testing"
 	"time"

-	"github.com/golang/mock/gomock"
-	"github.com/int128/kubelogin/integration_test/idp"
-	"github.com/int128/kubelogin/integration_test/idp/mock_idp"
-	"github.com/int128/kubelogin/integration_test/keys"
+	"github.com/int128/kubelogin/integration_test/httpdriver"
+	"github.com/int128/kubelogin/integration_test/keypair"
 	"github.com/int128/kubelogin/integration_test/kubeconfig"
-	"github.com/int128/kubelogin/integration_test/localserver"
+	"github.com/int128/kubelogin/integration_test/oidcserver"
 	"github.com/int128/kubelogin/pkg/adaptors/browser"
-	"github.com/int128/kubelogin/pkg/adaptors/browser/mock_browser"
-	"github.com/int128/kubelogin/pkg/adaptors/logger/mock_logger"
 	"github.com/int128/kubelogin/pkg/di"
+	"github.com/int128/kubelogin/pkg/testing/clock"
+	"github.com/int128/kubelogin/pkg/testing/logger"
 )

 // Run the integration tests of the Login use-case.
@@ -26,207 +24,241 @@ import (
 // 4. Verify the kubeconfig.
 //
 func TestStandalone(t *testing.T) {
-	t.Run("NoTLS", func(t *testing.T) {
-		testStandalone(t, keys.None)
-	})
-	t.Run("TLS", func(t *testing.T) {
-		testStandalone(t, keys.Server)
-	})
-}
+	timeout := 3 * time.Second
+	now := time.Date(2020, 1, 1, 0, 0, 0, 0, time.UTC)

-func testStandalone(t *testing.T, idpTLS keys.Keys) {
-	timeout := 5 * time.Second
+	for name, tc := range map[string]struct {
+		keyPair keypair.KeyPair
+		args    []string
+	}{
+		"NoTLS": {},
+		"TLS": {
+			keyPair: keypair.Server,
+		},
+	} {
+		t.Run(name, func(t *testing.T) {
+			t.Run("AuthCode", func(t *testing.T) {
+				t.Parallel()
+				ctx, cancel := context.WithTimeout(context.TODO(), timeout)
+				defer cancel()
+				sv := oidcserver.New(t, tc.keyPair, oidcserver.Config{
+					Want: oidcserver.Want{
+						Scope:             "openid",
+						RedirectURIPrefix: "http://localhost:",
+					},
+					Response: oidcserver.Response{
+						IDTokenExpiry: now.Add(time.Hour),
+					},
+				})
+				defer sv.Shutdown(t, ctx)
+				kubeConfigFilename := kubeconfig.Create(t, &kubeconfig.Values{
+					Issuer:                  sv.IssuerURL(),
+					IDPCertificateAuthority: tc.keyPair.CACertPath,
+				})
+				defer os.Remove(kubeConfigFilename)
+				runStandalone(t, ctx, standaloneConfig{
+					issuerURL:          sv.IssuerURL(),
+					kubeConfigFilename: kubeConfigFilename,
+					httpDriver:         httpdriver.New(ctx, t, tc.keyPair.TLSConfig),
+					now:                now,
+				})
+				kubeconfig.Verify(t, kubeConfigFilename, kubeconfig.AuthProviderConfig{
+					IDToken:      sv.LastTokenResponse().IDToken,
+					RefreshToken: sv.LastTokenResponse().RefreshToken,
+				})
+			})

-	t.Run("Defaults", func(t *testing.T) {
+			t.Run("ROPC", func(t *testing.T) {
+				t.Parallel()
+				ctx, cancel := context.WithTimeout(context.TODO(), timeout)
+				defer cancel()
+				sv := oidcserver.New(t, tc.keyPair, oidcserver.Config{
+					Want: oidcserver.Want{
+						Scope:             "openid",
+						RedirectURIPrefix: "http://localhost:",
+						Username:          "USER1",
+						Password:          "PASS1",
+					},
+					Response: oidcserver.Response{
+						IDTokenExpiry: now.Add(time.Hour),
+					},
+				})
+				defer sv.Shutdown(t, ctx)
+				kubeConfigFilename := kubeconfig.Create(t, &kubeconfig.Values{
+					Issuer:                  sv.IssuerURL(),
+					IDPCertificateAuthority: tc.keyPair.CACertPath,
+				})
+				defer os.Remove(kubeConfigFilename)
+				runStandalone(t, ctx, standaloneConfig{
+					issuerURL:          sv.IssuerURL(),
+					kubeConfigFilename: kubeConfigFilename,
+					httpDriver:         httpdriver.Zero(t),
+					now:                now,
+					args: []string{
+						"--username", "USER1",
+						"--password", "PASS1",
+					},
+				})
+				kubeconfig.Verify(t, kubeConfigFilename, kubeconfig.AuthProviderConfig{
+					IDToken:      sv.LastTokenResponse().IDToken,
+					RefreshToken: sv.LastTokenResponse().RefreshToken,
+				})
+			})
+
+			t.Run("TokenLifecycle", func(t *testing.T) {
+				t.Parallel()
+				ctx, cancel := context.WithTimeout(context.TODO(), timeout)
+				defer cancel()
+				sv := oidcserver.New(t, tc.keyPair, oidcserver.Config{})
+				defer sv.Shutdown(t, ctx)
+				kubeConfigFilename := kubeconfig.Create(t, &kubeconfig.Values{
+					Issuer:                  sv.IssuerURL(),
+					IDPCertificateAuthority: tc.keyPair.CACertPath,
+				})
+				defer os.Remove(kubeConfigFilename)
+
+				t.Run("NoToken", func(t *testing.T) {
+					sv.SetConfig(oidcserver.Config{
+						Want: oidcserver.Want{
+							Scope:             "openid",
+							RedirectURIPrefix: "http://localhost:",
+						},
+						Response: oidcserver.Response{
+							IDTokenExpiry: now.Add(time.Hour),
+							RefreshToken:  "REFRESH_TOKEN_1",
+						},
+					})
+					runStandalone(t, ctx, standaloneConfig{
+						issuerURL:          sv.IssuerURL(),
+						kubeConfigFilename: kubeConfigFilename,
+						httpDriver:         httpdriver.New(ctx, t, tc.keyPair.TLSConfig),
+						now:                now,
+					})
+					kubeconfig.Verify(t, kubeConfigFilename, kubeconfig.AuthProviderConfig{
+						IDToken:      sv.LastTokenResponse().IDToken,
+						RefreshToken: "REFRESH_TOKEN_1",
+					})
+				})
+				t.Run("Valid", func(t *testing.T) {
+					sv.SetConfig(oidcserver.Config{})
+					runStandalone(t, ctx, standaloneConfig{
+						issuerURL:          sv.IssuerURL(),
+						kubeConfigFilename: kubeConfigFilename,
+						httpDriver:         httpdriver.Zero(t),
+						now:                now,
+					})
+					kubeconfig.Verify(t, kubeConfigFilename, kubeconfig.AuthProviderConfig{
+						IDToken:      sv.LastTokenResponse().IDToken,
+						RefreshToken: "REFRESH_TOKEN_1",
+					})
+				})
+				t.Run("Refresh", func(t *testing.T) {
+					sv.SetConfig(oidcserver.Config{
+						Want: oidcserver.Want{
+							Scope:             "openid",
+							RedirectURIPrefix: "http://localhost:",
+							RefreshToken:      "REFRESH_TOKEN_1",
+						},
+						Response: oidcserver.Response{
+							IDTokenExpiry: now.Add(3 * time.Hour),
+							RefreshToken:  "REFRESH_TOKEN_2",
+						},
+					})
+					runStandalone(t, ctx, standaloneConfig{
+						issuerURL:          sv.IssuerURL(),
+						kubeConfigFilename: kubeConfigFilename,
+						httpDriver:         httpdriver.New(ctx, t, tc.keyPair.TLSConfig),
+						now:                now.Add(2 * time.Hour),
+					})
+					kubeconfig.Verify(t, kubeConfigFilename, kubeconfig.AuthProviderConfig{
+						IDToken:      sv.LastTokenResponse().IDToken,
+						RefreshToken: "REFRESH_TOKEN_2",
+					})
+				})
+				t.Run("RefreshAgain", func(t *testing.T) {
+					sv.SetConfig(oidcserver.Config{
+						Want: oidcserver.Want{
+							Scope:             "openid",
+							RedirectURIPrefix: "http://localhost:",
+							RefreshToken:      "REFRESH_TOKEN_2",
+						},
+						Response: oidcserver.Response{
+							IDTokenExpiry: now.Add(5 * time.Hour),
+						},
+					})
+					runStandalone(t, ctx, standaloneConfig{
+						issuerURL:          sv.IssuerURL(),
+						kubeConfigFilename: kubeConfigFilename,
+						httpDriver:         httpdriver.New(ctx, t, tc.keyPair.TLSConfig),
+						now:                now.Add(4 * time.Hour),
+					})
+					kubeconfig.Verify(t, kubeConfigFilename, kubeconfig.AuthProviderConfig{
+						IDToken:      sv.LastTokenResponse().IDToken,
+						RefreshToken: "REFRESH_TOKEN_2",
+					})
+				})
+			})
+		})
+	}
+
+	t.Run("TLSData", func(t *testing.T) {
 		t.Parallel()
 		ctx, cancel := context.WithTimeout(context.TODO(), timeout)
 		defer cancel()
-		ctrl := gomock.NewController(t)
-		defer ctrl.Finish()
-
-		provider := mock_idp.NewMockProvider(ctrl)
-		serverURL, server := localserver.Start(t, idp.NewHandler(t, provider), idpTLS)
-		defer server.Shutdown(t, ctx)
-		browserMock := newBrowserMock(ctx, t, ctrl, idpTLS)
-		var idToken string
-		setupAuthCodeFlow(t, provider, serverURL, "openid", &idToken)
+		sv := oidcserver.New(t, keypair.Server, oidcserver.Config{
+			Want: oidcserver.Want{
+				Scope:             "openid",
+				RedirectURIPrefix: "http://localhost:",
+			},
+			Response: oidcserver.Response{
+				IDTokenExpiry: now.Add(time.Hour),
+			},
+		})
+		defer sv.Shutdown(t, ctx)
 		kubeConfigFilename := kubeconfig.Create(t, &kubeconfig.Values{
-			Issuer:                  serverURL,
-			IDPCertificateAuthority: idpTLS.CACertPath,
+			Issuer:                      sv.IssuerURL(),
+			IDPCertificateAuthorityData: keypair.Server.CACertBase64,
 		})
 		defer os.Remove(kubeConfigFilename)
-
-		args := []string{
-			"--kubeconfig", kubeConfigFilename,
-		}
-		runRootCmd(t, ctx, browserMock, args)
+		runStandalone(t, ctx, standaloneConfig{
+			issuerURL:          sv.IssuerURL(),
+			kubeConfigFilename: kubeConfigFilename,
+			httpDriver:         httpdriver.New(ctx, t, keypair.Server.TLSConfig),
+			now:                now,
+		})
 		kubeconfig.Verify(t, kubeConfigFilename, kubeconfig.AuthProviderConfig{
-			IDToken:      idToken,
-			RefreshToken: "YOUR_REFRESH_TOKEN",
-		})
-	})
-
-	t.Run("ResourceOwnerPasswordCredentials", func(t *testing.T) {
-		t.Parallel()
-		ctx, cancel := context.WithTimeout(context.TODO(), timeout)
-		defer cancel()
-		ctrl := gomock.NewController(t)
-		defer ctrl.Finish()
-
-		provider := mock_idp.NewMockProvider(ctrl)
-		serverURL, server := localserver.Start(t, idp.NewHandler(t, provider), idpTLS)
-		defer server.Shutdown(t, ctx)
-		browserMock := mock_browser.NewMockInterface(ctrl)
-		idToken := newIDToken(t, serverURL, "", tokenExpiryFuture)
-		setupROPCFlow(provider, serverURL, "openid", "USER", "PASS", idToken)
-		kubeConfigFilename := kubeconfig.Create(t, &kubeconfig.Values{
-			Issuer:                  serverURL,
-			IDPCertificateAuthority: idpTLS.CACertPath,
-		})
-		defer os.Remove(kubeConfigFilename)
-
-		args := []string{
-			"--kubeconfig", kubeConfigFilename,
-			"--username", "USER",
-			"--password", "PASS",
-		}
-		runRootCmd(t, ctx, browserMock, args)
-		kubeconfig.Verify(t, kubeConfigFilename, kubeconfig.AuthProviderConfig{
-			IDToken:      idToken,
-			RefreshToken: "YOUR_REFRESH_TOKEN",
-		})
-	})
-
-	t.Run("HasValidToken", func(t *testing.T) {
-		t.Parallel()
-		ctx, cancel := context.WithTimeout(context.TODO(), timeout)
-		defer cancel()
-		ctrl := gomock.NewController(t)
-		defer ctrl.Finish()
-
-		provider := mock_idp.NewMockProvider(ctrl)
-		serverURL, server := localserver.Start(t, idp.NewHandler(t, provider), idpTLS)
-		defer server.Shutdown(t, ctx)
-		idToken := newIDToken(t, serverURL, "YOUR_NONCE", tokenExpiryFuture)
-		browserMock := mock_browser.NewMockInterface(ctrl)
-
-		kubeConfigFilename := kubeconfig.Create(t, &kubeconfig.Values{
-			Issuer:                  serverURL,
-			IDToken:                 idToken,
-			RefreshToken:            "YOUR_REFRESH_TOKEN",
-			IDPCertificateAuthority: idpTLS.CACertPath,
-		})
-		defer os.Remove(kubeConfigFilename)
-
-		args := []string{
-			"--kubeconfig", kubeConfigFilename,
-		}
-		runRootCmd(t, ctx, browserMock, args)
-		kubeconfig.Verify(t, kubeConfigFilename, kubeconfig.AuthProviderConfig{
-			IDToken:      idToken,
-			RefreshToken: "YOUR_REFRESH_TOKEN",
-		})
-	})
-
-	t.Run("HasValidRefreshToken", func(t *testing.T) {
-		t.Parallel()
-		ctx, cancel := context.WithTimeout(context.TODO(), timeout)
-		defer cancel()
-		ctrl := gomock.NewController(t)
-		defer ctrl.Finish()
-
-		provider := mock_idp.NewMockProvider(ctrl)
-		serverURL, server := localserver.Start(t, idp.NewHandler(t, provider), idpTLS)
-		defer server.Shutdown(t, ctx)
-		idToken := newIDToken(t, serverURL, "YOUR_NONCE", tokenExpiryFuture)
-		provider.EXPECT().Discovery().Return(idp.NewDiscoveryResponse(serverURL))
-		provider.EXPECT().GetCertificates().Return(idp.NewCertificatesResponse(keys.JWSKeyPair))
-		provider.EXPECT().Refresh("VALID_REFRESH_TOKEN").
-			Return(idp.NewTokenResponse(idToken, "NEW_REFRESH_TOKEN"), nil)
-		browserMock := mock_browser.NewMockInterface(ctrl)
-
-		kubeConfigFilename := kubeconfig.Create(t, &kubeconfig.Values{
-			Issuer:                  serverURL,
-			IDToken:                 newIDToken(t, serverURL, "YOUR_NONCE", tokenExpiryPast), // expired
-			RefreshToken:            "VALID_REFRESH_TOKEN",
-			IDPCertificateAuthority: idpTLS.CACertPath,
-		})
-		defer os.Remove(kubeConfigFilename)
-
-		args := []string{
-			"--kubeconfig", kubeConfigFilename,
-		}
-		runRootCmd(t, ctx, browserMock, args)
-		kubeconfig.Verify(t, kubeConfigFilename, kubeconfig.AuthProviderConfig{
-			IDToken:      idToken,
-			RefreshToken: "NEW_REFRESH_TOKEN",
-		})
-	})
-
-	t.Run("HasExpiredRefreshToken", func(t *testing.T) {
-		t.Parallel()
-		ctx, cancel := context.WithTimeout(context.TODO(), timeout)
-		defer cancel()
-		ctrl := gomock.NewController(t)
-		defer ctrl.Finish()
-
-		provider := mock_idp.NewMockProvider(ctrl)
-		serverURL, server := localserver.Start(t, idp.NewHandler(t, provider), idpTLS)
-		defer server.Shutdown(t, ctx)
-		var idToken string
-		setupAuthCodeFlow(t, provider, serverURL, "openid", &idToken)
-		provider.EXPECT().Refresh("EXPIRED_REFRESH_TOKEN").
-			Return(nil, &idp.ErrorResponse{Code: "invalid_request", Description: "token has expired"}).
-			MaxTimes(2) // package oauth2 will retry refreshing the token
-		browserMock := newBrowserMock(ctx, t, ctrl, idpTLS)
-
-		kubeConfigFilename := kubeconfig.Create(t, &kubeconfig.Values{
-			Issuer:                  serverURL,
-			IDToken:                 newIDToken(t, serverURL, "YOUR_NONCE", tokenExpiryPast), // expired
-			RefreshToken:            "EXPIRED_REFRESH_TOKEN",
-			IDPCertificateAuthority: idpTLS.CACertPath,
-		})
-		defer os.Remove(kubeConfigFilename)
-
-		args := []string{
-			"--kubeconfig", kubeConfigFilename,
-		}
-		runRootCmd(t, ctx, browserMock, args)
-		kubeconfig.Verify(t, kubeConfigFilename, kubeconfig.AuthProviderConfig{
-			IDToken:      idToken,
-			RefreshToken: "YOUR_REFRESH_TOKEN",
+			IDToken:      sv.LastTokenResponse().IDToken,
+			RefreshToken: sv.LastTokenResponse().RefreshToken,
 		})
 	})

 	t.Run("env_KUBECONFIG", func(t *testing.T) {
-		// do not run this in parallel due to change of the env var
 		ctx, cancel := context.WithTimeout(context.TODO(), timeout)
 		defer cancel()
-		ctrl := gomock.NewController(t)
-		defer ctrl.Finish()
-
-		provider := mock_idp.NewMockProvider(ctrl)
-		serverURL, server := localserver.Start(t, idp.NewHandler(t, provider), idpTLS)
-		defer server.Shutdown(t, ctx)
-		var idToken string
-		setupAuthCodeFlow(t, provider, serverURL, "openid", &idToken)
-		browserMock := newBrowserMock(ctx, t, ctrl, idpTLS)
-
+		sv := oidcserver.New(t, keypair.None, oidcserver.Config{
+			Want: oidcserver.Want{
+				Scope:             "openid",
+				RedirectURIPrefix: "http://localhost:",
+			},
+			Response: oidcserver.Response{
+				IDTokenExpiry: now.Add(time.Hour),
+			},
+		})
+		defer sv.Shutdown(t, ctx)
 		kubeConfigFilename := kubeconfig.Create(t, &kubeconfig.Values{
-			Issuer:                  serverURL,
-			IDPCertificateAuthority: idpTLS.CACertPath,
+			Issuer: sv.IssuerURL(),
 		})
 		defer os.Remove(kubeConfigFilename)
 		setenv(t, "KUBECONFIG", kubeConfigFilename+string(os.PathListSeparator)+"kubeconfig/testdata/dummy.yaml")
 		defer unsetenv(t, "KUBECONFIG")
-
-		args := []string{
-			"--kubeconfig", kubeConfigFilename,
-		}
-		runRootCmd(t, ctx, browserMock, args)
+		runStandalone(t, ctx, standaloneConfig{
+			issuerURL:  sv.IssuerURL(),
+			httpDriver: httpdriver.New(ctx, t, nil),
+			now:        now,
+		})
 		kubeconfig.Verify(t, kubeConfigFilename, kubeconfig.AuthProviderConfig{
-			IDToken:      idToken,
-			RefreshToken: "YOUR_REFRESH_TOKEN",
+			IDToken:      sv.LastTokenResponse().IDToken,
+			RefreshToken: sv.LastTokenResponse().RefreshToken,
 		})
 	})

@@ -234,42 +266,49 @@ func testStandalone(t *testing.T, idpTLS keys.Keys) {
 		t.Parallel()
 		ctx, cancel := context.WithTimeout(context.TODO(), timeout)
 		defer cancel()
-		ctrl := gomock.NewController(t)
-		defer ctrl.Finish()
-
-		provider := mock_idp.NewMockProvider(ctrl)
-		serverURL, server := localserver.Start(t, idp.NewHandler(t, provider), idpTLS)
-		defer server.Shutdown(t, ctx)
-		var idToken string
-		setupAuthCodeFlow(t, provider, serverURL, "profile groups openid", &idToken)
-		browserMock := newBrowserMock(ctx, t, ctrl, idpTLS)
-
+		sv := oidcserver.New(t, keypair.None, oidcserver.Config{
+			Want: oidcserver.Want{
+				Scope:             "profile groups openid",
+				RedirectURIPrefix: "http://localhost:",
+			},
+			Response: oidcserver.Response{
+				IDTokenExpiry: now.Add(time.Hour),
+			},
+		})
+		defer sv.Shutdown(t, ctx)
 		kubeConfigFilename := kubeconfig.Create(t, &kubeconfig.Values{
-			Issuer:                  serverURL,
-			ExtraScopes:             "profile,groups",
-			IDPCertificateAuthority: idpTLS.CACertPath,
+			Issuer:      sv.IssuerURL(),
+			ExtraScopes: "profile,groups",
 		})
 		defer os.Remove(kubeConfigFilename)
-
-		args := []string{
-			"--kubeconfig", kubeConfigFilename,
-		}
-		runRootCmd(t, ctx, browserMock, args)
+		runStandalone(t, ctx, standaloneConfig{
+			issuerURL:          sv.IssuerURL(),
+			kubeConfigFilename: kubeConfigFilename,
+			httpDriver:         httpdriver.New(ctx, t, nil),
+			now:                now,
+		})
 		kubeconfig.Verify(t, kubeConfigFilename, kubeconfig.AuthProviderConfig{
-			IDToken:      idToken,
-			RefreshToken: "YOUR_REFRESH_TOKEN",
+			IDToken:      sv.LastTokenResponse().IDToken,
+			RefreshToken: sv.LastTokenResponse().RefreshToken,
 		})
 	})
 }

-func runRootCmd(t *testing.T, ctx context.Context, b browser.Interface, args []string) {
-	t.Helper()
-	cmd := di.NewCmdForHeadless(mock_logger.New(t), b, nil)
+type standaloneConfig struct {
+	issuerURL          string
+	kubeConfigFilename string
+	httpDriver         browser.Interface
+	now                time.Time
+	args               []string
+}
+
+func runStandalone(t *testing.T, ctx context.Context, cfg standaloneConfig) {
+	cmd := di.NewCmdForHeadless(clock.Fake(cfg.now), os.Stdin, os.Stdout, logger.New(t), cfg.httpDriver)
 	exitCode := cmd.Run(ctx, append([]string{
 		"kubelogin",
-		"--v=1",
+		"--kubeconfig", cfg.kubeConfigFilename,
 		"--listen-address", "127.0.0.1:0",
-	}, args...), "HEAD")
+	}, cfg.args...), "HEAD")
 	if exitCode != 0 {
 		t.Errorf("exit status wants 0 but %d", exitCode)
 	}
--- a/pkg/adaptors/browser/browser.go
+++ b/pkg/adaptors/browser/browser.go
@@ -16,7 +16,6 @@ func init() {
 	browser.Stdout = os.Stderr
 }

-// Set provides an implementation and interface for Env.
 var Set = wire.NewSet(
 	wire.Struct(new(Browser)),
 	wire.Bind(new(Interface), new(*Browser)),
--- a/pkg/adaptors/clock/clock.go
+++ b/pkg/adaptors/clock/clock.go
@@ -0,0 +1,24 @@
+// Package clock provides the system clock.
+package clock
+
+import (
+	"time"
+
+	"github.com/google/wire"
+)
+
+var Set = wire.NewSet(
+	wire.Struct(new(Real), "*"),
+	wire.Bind(new(Interface), new(*Real)),
+)
+
+type Interface interface {
+	Now() time.Time
+}
+
+type Real struct{}
+
+// Now returns the current time.
+func (c *Real) Now() time.Time {
+	return time.Now()
+}
--- a/pkg/adaptors/cmd/cmd.go
+++ b/pkg/adaptors/cmd/cmd.go
@@ -2,7 +2,7 @@ package cmd

 import (
 	"context"
-	"path/filepath"
+	"runtime"

 	"github.com/google/wire"
 	"github.com/int128/kubelogin/pkg/adaptors/logger"
@@ -37,17 +37,15 @@ type Cmd struct {
 // Run parses the command line arguments and executes the specified use-case.
 // It returns an exit code, that is 0 on success or 1 on error.
 func (cmd *Cmd) Run(ctx context.Context, args []string, version string) int {
-	executable := filepath.Base(args[0])
-
-	rootCmd := cmd.Root.New(ctx, executable)
+	rootCmd := cmd.Root.New()
 	rootCmd.Version = version
 	rootCmd.SilenceUsage = true
 	rootCmd.SilenceErrors = true

-	getTokenCmd := cmd.GetToken.New(ctx)
+	getTokenCmd := cmd.GetToken.New()
 	rootCmd.AddCommand(getTokenCmd)

-	setupCmd := cmd.Setup.New(ctx)
+	setupCmd := cmd.Setup.New()
 	rootCmd.AddCommand(setupCmd)

 	versionCmd := &cobra.Command{
@@ -55,13 +53,13 @@ func (cmd *Cmd) Run(ctx context.Context, args []string, version string) int {
 		Short: "Print the version information",
 		Args:  cobra.NoArgs,
 		Run: func(*cobra.Command, []string) {
-			cmd.Logger.Printf("%s version %s", executable, version)
+			cmd.Logger.Printf("kubelogin version %s (%s %s_%s)", version, runtime.Version(), runtime.GOOS, runtime.GOARCH)
 		},
 	}
 	rootCmd.AddCommand(versionCmd)

 	rootCmd.SetArgs(args[1:])
-	if err := rootCmd.Execute(); err != nil {
+	if err := rootCmd.ExecuteContext(ctx); err != nil {
 		cmd.Logger.Printf("error: %s", err)
 		cmd.Logger.V(1).Infof("stacktrace: %+v", err)
 		return 1
--- a/pkg/adaptors/cmd/cmd_test.go
+++ b/pkg/adaptors/cmd/cmd_test.go
@@ -5,7 +5,7 @@ import (
 	"testing"

 	"github.com/golang/mock/gomock"
-	"github.com/int128/kubelogin/pkg/adaptors/logger/mock_logger"
+	"github.com/int128/kubelogin/pkg/testing/logger"
 	"github.com/int128/kubelogin/pkg/usecases/authentication"
 	"github.com/int128/kubelogin/pkg/usecases/credentialplugin"
 	"github.com/int128/kubelogin/pkg/usecases/credentialplugin/mock_credentialplugin"
@@ -27,7 +27,8 @@ func TestCmd_Run(t *testing.T) {
 				in: standalone.Input{
 					GrantOptionSet: authentication.GrantOptionSet{
 						AuthCodeOption: &authentication.AuthCodeOption{
-							BindAddress: defaultListenAddress,
+							BindAddress:         defaultListenAddress,
+							RedirectURLHostname: "localhost",
 						},
 					},
 				},
@@ -41,7 +42,8 @@ func TestCmd_Run(t *testing.T) {
 				in: standalone.Input{
 					GrantOptionSet: authentication.GrantOptionSet{
 						AuthCodeOption: &authentication.AuthCodeOption{
-							BindAddress: []string{"127.0.0.1:10080", "127.0.0.1:20080"},
+							BindAddress:         []string{"127.0.0.1:10080", "127.0.0.1:20080"},
+							RedirectURLHostname: "localhost",
 						},
 					},
 				},
@@ -57,7 +59,8 @@ func TestCmd_Run(t *testing.T) {
 				in: standalone.Input{
 					GrantOptionSet: authentication.GrantOptionSet{
 						AuthCodeOption: &authentication.AuthCodeOption{
-							BindAddress: []string{"127.0.0.1:10080", "127.0.0.1:20080"},
+							BindAddress:         []string{"127.0.0.1:10080", "127.0.0.1:20080"},
+							RedirectURLHostname: "localhost",
 						},
 					},
 				},
@@ -85,8 +88,9 @@ func TestCmd_Run(t *testing.T) {
 					SkipTLSVerify:      true,
 					GrantOptionSet: authentication.GrantOptionSet{
 						AuthCodeOption: &authentication.AuthCodeOption{
-							BindAddress:     []string{"127.0.0.1:10080", "127.0.0.1:20080"},
-							SkipOpenBrowser: true,
+							BindAddress:         []string{"127.0.0.1:10080", "127.0.0.1:20080"},
+							SkipOpenBrowser:     true,
+							RedirectURLHostname: "localhost",
 						},
 					},
 				},
@@ -146,9 +150,9 @@ func TestCmd_Run(t *testing.T) {
 				cmd := Cmd{
 					Root: &Root{
 						Standalone: mockStandalone,
-						Logger:     mock_logger.New(t),
+						Logger:     logger.New(t),
 					},
-					Logger: mock_logger.New(t),
+					Logger: logger.New(t),
 				}
 				exitCode := cmd.Run(ctx, c.args, version)
 				if exitCode != 0 {
@@ -163,9 +167,9 @@ func TestCmd_Run(t *testing.T) {
 			cmd := Cmd{
 				Root: &Root{
 					Standalone: mock_standalone.NewMockInterface(ctrl),
-					Logger:     mock_logger.New(t),
+					Logger:     logger.New(t),
 				},
-				Logger: mock_logger.New(t),
+				Logger: logger.New(t),
 			}
 			exitCode := cmd.Run(context.TODO(), []string{executable, "some"}, version)
 			if exitCode != 1 {
@@ -191,7 +195,8 @@ func TestCmd_Run(t *testing.T) {
 					ClientID:      "YOUR_CLIENT_ID",
 					GrantOptionSet: authentication.GrantOptionSet{
 						AuthCodeOption: &authentication.AuthCodeOption{
-							BindAddress: []string{"127.0.0.1:8000", "127.0.0.1:18000"},
+							BindAddress:         []string{"127.0.0.1:8000", "127.0.0.1:18000"},
+							RedirectURLHostname: "localhost",
 						},
 					},
 				},
@@ -212,6 +217,8 @@ func TestCmd_Run(t *testing.T) {
 					"--listen-address", "127.0.0.1:10080",
 					"--listen-address", "127.0.0.1:20080",
 					"--skip-open-browser",
+					"--oidc-auth-request-extra-params", "ttl=86400",
+					"--oidc-auth-request-extra-params", "reauth=true",
 					"--username", "USER",
 					"--password", "PASS",
 				},
@@ -226,8 +233,10 @@ func TestCmd_Run(t *testing.T) {
 					SkipTLSVerify:  true,
 					GrantOptionSet: authentication.GrantOptionSet{
 						AuthCodeOption: &authentication.AuthCodeOption{
-							BindAddress:     []string{"127.0.0.1:10080", "127.0.0.1:20080"},
-							SkipOpenBrowser: true,
+							BindAddress:            []string{"127.0.0.1:10080", "127.0.0.1:20080"},
+							SkipOpenBrowser:        true,
+							RedirectURLHostname:    "localhost",
+							AuthRequestExtraParams: map[string]string{"ttl": "86400", "reauth": "true"},
 						},
 					},
 				},
@@ -238,13 +247,16 @@ func TestCmd_Run(t *testing.T) {
 					"--oidc-issuer-url", "https://issuer.example.com",
 					"--oidc-client-id", "YOUR_CLIENT_ID",
 					"--grant-type", "authcode-keyboard",
+					"--oidc-auth-request-extra-params", "ttl=86400",
 				},
 				in: credentialplugin.Input{
 					TokenCacheDir: defaultTokenCacheDir,
 					IssuerURL:     "https://issuer.example.com",
 					ClientID:      "YOUR_CLIENT_ID",
 					GrantOptionSet: authentication.GrantOptionSet{
-						AuthCodeKeyboardOption: &authentication.AuthCodeKeyboardOption{},
+						AuthCodeKeyboardOption: &authentication.AuthCodeKeyboardOption{
+							AuthRequestExtraParams: map[string]string{"ttl": "86400"},
+						},
 					},
 				},
 			},
@@ -304,13 +316,13 @@ func TestCmd_Run(t *testing.T) {
 					Do(ctx, c.in)
 				cmd := Cmd{
 					Root: &Root{
-						Logger: mock_logger.New(t),
+						Logger: logger.New(t),
 					},
 					GetToken: &GetToken{
 						GetToken: getToken,
-						Logger:   mock_logger.New(t),
+						Logger:   logger.New(t),
 					},
-					Logger: mock_logger.New(t),
+					Logger: logger.New(t),
 				}
 				exitCode := cmd.Run(ctx, c.args, version)
 				if exitCode != 0 {
@@ -325,13 +337,13 @@ func TestCmd_Run(t *testing.T) {
 			ctx := context.TODO()
 			cmd := Cmd{
 				Root: &Root{
-					Logger: mock_logger.New(t),
+					Logger: logger.New(t),
 				},
 				GetToken: &GetToken{
 					GetToken: mock_credentialplugin.NewMockInterface(ctrl),
-					Logger:   mock_logger.New(t),
+					Logger:   logger.New(t),
 				},
-				Logger: mock_logger.New(t),
+				Logger: logger.New(t),
 			}
 			exitCode := cmd.Run(ctx, []string{executable, "get-token"}, version)
 			if exitCode != 1 {
@@ -345,13 +357,13 @@ func TestCmd_Run(t *testing.T) {
 			ctx := context.TODO()
 			cmd := Cmd{
 				Root: &Root{
-					Logger: mock_logger.New(t),
+					Logger: logger.New(t),
 				},
 				GetToken: &GetToken{
 					GetToken: mock_credentialplugin.NewMockInterface(ctrl),
-					Logger:   mock_logger.New(t),
+					Logger:   logger.New(t),
 				},
-				Logger: mock_logger.New(t),
+				Logger: logger.New(t),
 			}
 			exitCode := cmd.Run(ctx, []string{executable, "get-token", "foo"}, version)
 			if exitCode != 1 {
--- a/pkg/adaptors/cmd/get_token.go
+++ b/pkg/adaptors/cmd/get_token.go
@@ -1,8 +1,6 @@
 package cmd

 import (
-	"context"
-
 	"github.com/int128/kubelogin/pkg/adaptors/logger"
 	"github.com/int128/kubelogin/pkg/usecases/credentialplugin"
 	"github.com/spf13/cobra"
@@ -41,7 +39,7 @@ type GetToken struct {
 	Logger   logger.Interface
 }

-func (cmd *GetToken) New(ctx context.Context) *cobra.Command {
+func (cmd *GetToken) New() *cobra.Command {
 	var o getTokenOptions
 	c := &cobra.Command{
 		Use:   "get-token [flags]",
@@ -58,10 +56,10 @@ func (cmd *GetToken) New(ctx context.Context) *cobra.Command {
 			}
 			return nil
 		},
-		RunE: func(*cobra.Command, []string) error {
+		RunE: func(c *cobra.Command, _ []string) error {
 			grantOptionSet, err := o.authenticationOptions.grantOptionSet()
 			if err != nil {
-				return xerrors.Errorf("error: %w", err)
+				return xerrors.Errorf("get-token: %w", err)
 			}
 			in := credentialplugin.Input{
 				IssuerURL:      o.IssuerURL,
@@ -74,8 +72,8 @@ func (cmd *GetToken) New(ctx context.Context) *cobra.Command {
 				TokenCacheDir:  o.TokenCacheDir,
 				GrantOptionSet: grantOptionSet,
 			}
-			if err := cmd.GetToken.Do(ctx, in); err != nil {
-				return xerrors.Errorf("error: %w", err)
+			if err := cmd.GetToken.Do(c.Context(), in); err != nil {
+				return xerrors.Errorf("get-token: %w", err)
 			}
 			return nil
 		},
--- a/pkg/adaptors/cmd/root.go
+++ b/pkg/adaptors/cmd/root.go
@@ -1,7 +1,6 @@
 package cmd

 import (
-	"context"
 	"fmt"
 	"strings"

@@ -45,12 +44,14 @@ func (o *rootOptions) register(f *pflag.FlagSet) {
 }

 type authenticationOptions struct {
-	GrantType       string
-	ListenAddress   []string
-	ListenPort      []int // deprecated
-	SkipOpenBrowser bool
-	Username        string
-	Password        string
+	GrantType              string
+	ListenAddress          []string
+	ListenPort             []int // deprecated
+	SkipOpenBrowser        bool
+	RedirectURLHostname    string
+	AuthRequestExtraParams map[string]string
+	Username               string
+	Password               string
 }

 // determineListenAddress returns the addresses from the flags.
@@ -81,6 +82,8 @@ func (o *authenticationOptions) register(f *pflag.FlagSet) {
 	//TODO: remove the deprecated flag
 	f.IntSliceVar(&o.ListenPort, "listen-port", nil, "(Deprecated: use --listen-address)")
 	f.BoolVar(&o.SkipOpenBrowser, "skip-open-browser", false, "If true, it does not open the browser on authentication")
+	f.StringVar(&o.RedirectURLHostname, "oidc-redirect-url-hostname", "localhost", "Hostname of the redirect URL")
+	f.StringToStringVar(&o.AuthRequestExtraParams, "oidc-auth-request-extra-params", nil, "Extra query parameters to send with an authentication request")
 	f.StringVar(&o.Username, "username", "", "If set, perform the resource owner password credentials grant")
 	f.StringVar(&o.Password, "password", "", "If set, use the password instead of asking it")
 }
@@ -89,11 +92,15 @@ func (o *authenticationOptions) grantOptionSet() (s authentication.GrantOptionSe
 	switch {
 	case o.GrantType == "authcode" || (o.GrantType == "auto" && o.Username == ""):
 		s.AuthCodeOption = &authentication.AuthCodeOption{
-			BindAddress:     o.determineListenAddress(),
-			SkipOpenBrowser: o.SkipOpenBrowser,
+			BindAddress:            o.determineListenAddress(),
+			SkipOpenBrowser:        o.SkipOpenBrowser,
+			RedirectURLHostname:    o.RedirectURLHostname,
+			AuthRequestExtraParams: o.AuthRequestExtraParams,
 		}
 	case o.GrantType == "authcode-keyboard":
-		s.AuthCodeKeyboardOption = &authentication.AuthCodeKeyboardOption{}
+		s.AuthCodeKeyboardOption = &authentication.AuthCodeKeyboardOption{
+			AuthRequestExtraParams: o.AuthRequestExtraParams,
+		}
 	case o.GrantType == "password" || (o.GrantType == "auto" && o.Username != ""):
 		s.ROPCOption = &authentication.ROPCOption{
 			Username: o.Username,
@@ -110,14 +117,14 @@ type Root struct {
 	Logger     logger.Interface
 }

-func (cmd *Root) New(ctx context.Context, executable string) *cobra.Command {
+func (cmd *Root) New() *cobra.Command {
 	var o rootOptions
 	rootCmd := &cobra.Command{
-		Use:   executable,
+		Use:   "kubelogin",
 		Short: "Login to the OpenID Connect provider",
 		Long:  longDescription,
 		Args:  cobra.NoArgs,
-		RunE: func(*cobra.Command, []string) error {
+		RunE: func(c *cobra.Command, _ []string) error {
 			grantOptionSet, err := o.authenticationOptions.grantOptionSet()
 			if err != nil {
 				return xerrors.Errorf("invalid option: %w", err)
@@ -130,8 +137,8 @@ func (cmd *Root) New(ctx context.Context, executable string) *cobra.Command {
 				SkipTLSVerify:      o.SkipTLSVerify,
 				GrantOptionSet:     grantOptionSet,
 			}
-			if err := cmd.Standalone.Do(ctx, in); err != nil {
-				return xerrors.Errorf("error: %w", err)
+			if err := cmd.Standalone.Do(c.Context(), in); err != nil {
+				return xerrors.Errorf("login: %w", err)
 			}
 			return nil
 		},
--- a/pkg/adaptors/cmd/setup.go
+++ b/pkg/adaptors/cmd/setup.go
@@ -1,8 +1,6 @@
 package cmd

 import (
-	"context"
-
 	"github.com/int128/kubelogin/pkg/usecases/setup"
 	"github.com/spf13/cobra"
 	"github.com/spf13/pflag"
@@ -37,7 +35,7 @@ type Setup struct {
 	Setup setup.Interface
 }

-func (cmd *Setup) New(ctx context.Context) *cobra.Command {
+func (cmd *Setup) New() *cobra.Command {
 	var o setupOptions
 	c := &cobra.Command{
 		Use:   "setup",
@@ -46,7 +44,7 @@ func (cmd *Setup) New(ctx context.Context) *cobra.Command {
 		RunE: func(c *cobra.Command, _ []string) error {
 			grantOptionSet, err := o.authenticationOptions.grantOptionSet()
 			if err != nil {
-				return xerrors.Errorf("error: %w", err)
+				return xerrors.Errorf("setup: %w", err)
 			}
 			in := setup.Stage2Input{
 				IssuerURL:      o.IssuerURL,
@@ -65,8 +63,8 @@ func (cmd *Setup) New(ctx context.Context) *cobra.Command {
 				cmd.Setup.DoStage1()
 				return nil
 			}
-			if err := cmd.Setup.DoStage2(ctx, in); err != nil {
-				return xerrors.Errorf("error: %w", err)
+			if err := cmd.Setup.DoStage2(c.Context(), in); err != nil {
+				return xerrors.Errorf("setup: %w", err)
 			}
 			return nil
 		},
--- a/pkg/adaptors/credentialpluginwriter/credential_plugin.go
+++ b/pkg/adaptors/credentialpluginwriter/credential_plugin.go
@@ -3,13 +3,13 @@ package credentialpluginwriter

 import (
 	"encoding/json"
-	"os"
 	"time"

 	"github.com/google/wire"
+	"github.com/int128/kubelogin/pkg/adaptors/stdio"
 	"golang.org/x/xerrors"
-	"k8s.io/apimachinery/pkg/apis/meta/v1"
-	"k8s.io/client-go/pkg/apis/clientauthentication/v1beta1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	clientauthenticationv1beta1 "k8s.io/client-go/pkg/apis/clientauthentication/v1beta1"
 )

 //go:generate mockgen -destination mock_credentialpluginwriter/mock_credentialpluginwriter.go github.com/int128/kubelogin/pkg/adaptors/credentialpluginwriter Interface
@@ -29,21 +29,23 @@ type Output struct {
 	Expiry time.Time
 }

-type Writer struct{}
+type Writer struct {
+	Stdout stdio.Stdout
+}

 // Write writes the ExecCredential to standard output for kubectl.
-func (*Writer) Write(out Output) error {
-	ec := &v1beta1.ExecCredential{
-		TypeMeta: v1.TypeMeta{
+func (w *Writer) Write(out Output) error {
+	ec := &clientauthenticationv1beta1.ExecCredential{
+		TypeMeta: metav1.TypeMeta{
 			APIVersion: "client.authentication.k8s.io/v1beta1",
 			Kind:       "ExecCredential",
 		},
-		Status: &v1beta1.ExecCredentialStatus{
+		Status: &clientauthenticationv1beta1.ExecCredentialStatus{
 			Token:               out.Token,
-			ExpirationTimestamp: &v1.Time{Time: out.Expiry},
+			ExpirationTimestamp: &metav1.Time{Time: out.Expiry},
 		},
 	}
-	e := json.NewEncoder(os.Stdout)
+	e := json.NewEncoder(w.Stdout)
 	if err := e.Encode(ec); err != nil {
 		return xerrors.Errorf("could not write the ExecCredential: %w", err)
 	}
--- a/pkg/adaptors/env/env.go
+++ b/pkg/adaptors/env/env.go
@@ -1,66 +0,0 @@
-// Package env provides environment dependent facilities.
-package env
-
-import (
-	"bufio"
-	"fmt"
-	"os"
-	"strings"
-	"syscall"
-	"time"
-
-	"github.com/google/wire"
-	"golang.org/x/crypto/ssh/terminal"
-	"golang.org/x/xerrors"
-)
-
-//go:generate mockgen -destination mock_env/mock_env.go github.com/int128/kubelogin/pkg/adaptors/env Interface
-
-// Set provides an implementation and interface for Env.
-var Set = wire.NewSet(
-	wire.Struct(new(Env), "*"),
-	wire.Bind(new(Interface), new(*Env)),
-)
-
-type Interface interface {
-	ReadString(prompt string) (string, error)
-	ReadPassword(prompt string) (string, error)
-	Now() time.Time
-}
-
-// Env provides environment specific facilities.
-type Env struct{}
-
-// ReadString reads a string from the stdin.
-func (*Env) ReadString(prompt string) (string, error) {
-	if _, err := fmt.Fprint(os.Stderr, prompt); err != nil {
-		return "", xerrors.Errorf("could not write the prompt: %w", err)
-	}
-	r := bufio.NewReader(os.Stdin)
-	s, err := r.ReadString('\n')
-	if err != nil {
-		return "", xerrors.Errorf("could not read from stdin: %w", err)
-	}
-	s = strings.TrimRight(s, "\r\n")
-	return s, nil
-}
-
-// ReadPassword reads a password from the stdin without echo back.
-func (*Env) ReadPassword(prompt string) (string, error) {
-	if _, err := fmt.Fprint(os.Stderr, prompt); err != nil {
-		return "", xerrors.Errorf("could not write the prompt: %w", err)
-	}
-	b, err := terminal.ReadPassword(int(syscall.Stdin))
-	if err != nil {
-		return "", xerrors.Errorf("could not read from stdin: %w", err)
-	}
-	if _, err := fmt.Fprintln(os.Stderr); err != nil {
-		return "", xerrors.Errorf("could not write a new line: %w", err)
-	}
-	return string(b), nil
-}
-
-// Now returns the current time.
-func (*Env) Now() time.Time {
-	return time.Now()
-}
--- a/pkg/adaptors/jwtdecoder/decoder.go
+++ b/pkg/adaptors/jwtdecoder/decoder.go
@@ -1,68 +0,0 @@
-// Package jwtdecoder provides decoding a JWT.
-package jwtdecoder
-
-import (
-	"bytes"
-	"encoding/json"
-	"fmt"
-	"strings"
-	"time"
-
-	"github.com/dgrijalva/jwt-go"
-	"github.com/google/wire"
-	"github.com/int128/kubelogin/pkg/domain/oidc"
-	"golang.org/x/xerrors"
-)
-
-//go:generate mockgen -destination mock_jwtdecoder/mock_jwtdecoder.go github.com/int128/kubelogin/pkg/adaptors/jwtdecoder Interface
-
-// Set provides an implementation and interface.
-var Set = wire.NewSet(
-	wire.Struct(new(Decoder), "*"),
-	wire.Bind(new(Interface), new(*Decoder)),
-)
-
-type Interface interface {
-	Decode(s string) (*oidc.Claims, error)
-}
-
-type Decoder struct{}
-
-// Decode returns the claims of the JWT.
-// Note that this method does not verify the signature and always trust it.
-func (d *Decoder) Decode(s string) (*oidc.Claims, error) {
-	parts := strings.Split(s, ".")
-	if len(parts) != 3 {
-		return nil, xerrors.Errorf("token contains an invalid number of segments")
-	}
-	b, err := jwt.DecodeSegment(parts[1])
-	if err != nil {
-		return nil, xerrors.Errorf("could not decode the token: %w", err)
-	}
-	var claims jwt.StandardClaims
-	if err := json.NewDecoder(bytes.NewBuffer(b)).Decode(&claims); err != nil {
-		return nil, xerrors.Errorf("could not decode the json of token: %w", err)
-	}
-	var rawClaims map[string]interface{}
-	if err := json.NewDecoder(bytes.NewBuffer(b)).Decode(&rawClaims); err != nil {
-		return nil, xerrors.Errorf("could not decode the json of token: %w", err)
-	}
-	return &oidc.Claims{
-		Subject: claims.Subject,
-		Expiry:  time.Unix(claims.ExpiresAt, 0),
-		Pretty:  dumpRawClaims(rawClaims),
-	}, nil
-}
-
-func dumpRawClaims(rawClaims map[string]interface{}) map[string]string {
-	claims := make(map[string]string)
-	for k, v := range rawClaims {
-		switch v := v.(type) {
-		case float64:
-			claims[k] = fmt.Sprintf("%.f", v)
-		default:
-			claims[k] = fmt.Sprintf("%v", v)
-		}
-	}
-	return claims
-}
--- a/pkg/adaptors/jwtdecoder/decoder_test.go
+++ b/pkg/adaptors/jwtdecoder/decoder_test.go
@@ -1,87 +0,0 @@
-package jwtdecoder
-
-import (
-	"crypto/rsa"
-	"crypto/x509"
-	"encoding/pem"
-	"io/ioutil"
-	"testing"
-	"time"
-
-	"github.com/dgrijalva/jwt-go"
-)
-
-func TestDecoder_Decode(t *testing.T) {
-	var decoder Decoder
-
-	t.Run("ValidToken", func(t *testing.T) {
-		expiry := time.Now().Round(time.Second)
-		idToken := newIDToken(t, "https://issuer.example.com", expiry)
-		decodedToken, err := decoder.Decode(idToken)
-		if err != nil {
-			t.Fatalf("Decode error: %s", err)
-		}
-		if decodedToken.Expiry != expiry {
-			t.Errorf("Expiry wants %s but %s", expiry, decodedToken.Expiry)
-		}
-		t.Logf("Pretty=%+v", decodedToken.Pretty)
-	})
-	t.Run("InvalidToken", func(t *testing.T) {
-		decodedToken, err := decoder.Decode("HEADER.INVALID_TOKEN.SIGNATURE")
-		if err == nil {
-			t.Errorf("error wants non-nil but nil")
-		} else {
-			t.Logf("expected error: %+v", err)
-		}
-		if decodedToken != nil {
-			t.Errorf("decodedToken wants nil but %+v", decodedToken)
-		}
-	})
-}
-
-func newIDToken(t *testing.T, issuer string, expiry time.Time) string {
-	t.Helper()
-	claims := struct {
-		jwt.StandardClaims
-		Nonce         string   `json:"nonce"`
-		Groups        []string `json:"groups"`
-		EmailVerified bool     `json:"email_verified"`
-	}{
-		StandardClaims: jwt.StandardClaims{
-			Issuer:    issuer,
-			Audience:  "kubernetes",
-			Subject:   "SUBJECT",
-			IssuedAt:  time.Now().Unix(),
-			ExpiresAt: expiry.Unix(),
-		},
-		Nonce:         "NONCE",
-		Groups:        []string{"admin", "users"},
-		EmailVerified: false,
-	}
-	token := jwt.NewWithClaims(jwt.SigningMethodRS256, claims)
-	s, err := token.SignedString(readPrivateKey(t, "testdata/jws.key"))
-	if err != nil {
-		t.Fatalf("Could not sign the claims: %s", err)
-	}
-	return s
-}
-
-func readPrivateKey(t *testing.T, name string) *rsa.PrivateKey {
-	t.Helper()
-	b, err := ioutil.ReadFile(name)
-	if err != nil {
-		t.Fatalf("could not read the file: %s", err)
-	}
-	block, rest := pem.Decode(b)
-	if block == nil {
-		t.Fatalf("could not decode PEM")
-	}
-	if len(rest) > 0 {
-		t.Fatalf("PEM should contain single key but multiple keys")
-	}
-	k, err := x509.ParsePKCS1PrivateKey(block.Bytes)
-	if err != nil {
-		t.Fatalf("could not parse the key: %s", err)
-	}
-	return k
-}
--- a/pkg/adaptors/jwtdecoder/mock_jwtdecoder/mock_jwtdecoder.go
+++ b/pkg/adaptors/jwtdecoder/mock_jwtdecoder/mock_jwtdecoder.go
@@ -1,49 +0,0 @@
-// Code generated by MockGen. DO NOT EDIT.
-// Source: github.com/int128/kubelogin/pkg/adaptors/jwtdecoder (interfaces: Interface)
-
-// Package mock_jwtdecoder is a generated GoMock package.
-package mock_jwtdecoder
-
-import (
-	gomock "github.com/golang/mock/gomock"
-	oidc "github.com/int128/kubelogin/pkg/domain/oidc"
-	reflect "reflect"
-)
-
-// MockInterface is a mock of Interface interface
-type MockInterface struct {
-	ctrl     *gomock.Controller
-	recorder *MockInterfaceMockRecorder
-}
-
-// MockInterfaceMockRecorder is the mock recorder for MockInterface
-type MockInterfaceMockRecorder struct {
-	mock *MockInterface
-}
-
-// NewMockInterface creates a new mock instance
-func NewMockInterface(ctrl *gomock.Controller) *MockInterface {
-	mock := &MockInterface{ctrl: ctrl}
-	mock.recorder = &MockInterfaceMockRecorder{mock}
-	return mock
-}
-
-// EXPECT returns an object that allows the caller to indicate expected use
-func (m *MockInterface) EXPECT() *MockInterfaceMockRecorder {
-	return m.recorder
-}
-
-// Decode mocks base method
-func (m *MockInterface) Decode(arg0 string) (*oidc.Claims, error) {
-	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "Decode", arg0)
-	ret0, _ := ret[0].(*oidc.Claims)
-	ret1, _ := ret[1].(error)
-	return ret0, ret1
-}
-
-// Decode indicates an expected call of Decode
-func (mr *MockInterfaceMockRecorder) Decode(arg0 interface{}) *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Decode", reflect.TypeOf((*MockInterface)(nil).Decode), arg0)
-}
--- a/pkg/adaptors/jwtdecoder/testdata/Makefile
+++ b/pkg/adaptors/jwtdecoder/testdata/Makefile
@@ -1,8 +0,0 @@
-all: jws.key
-
-jws.key:
-	openssl genrsa -out $@ 1024
-
-.PHONY: clean
-clean:
-	-rm -v jws.key
--- a/pkg/adaptors/jwtdecoder/testdata/jws.key
+++ b/pkg/adaptors/jwtdecoder/testdata/jws.key
@@ -1,15 +0,0 @@
-----BEGIN RSA PRIVATE KEY-----
-MIICXAIBAAKBgQCrH34yA/f/sBOUlkYnRtd2jgDZ3WivhidqvoQaa73xqTazbkn6
-GZ9r7jx0CGLRV2bmErj2WoyT54yrhezrKh0YXAHlrwLdsmV4dwiV0lOfUJd9P/vF
-e2hiAWv4CcO9ZuNkTsrxM5W8Wdj2tjqOvsIn4We+HWPkpknT7VtT5RrumwIDAQAB
-AoGAFqy5oA7+kZbXQV0YNqQgcMkoO7Ym5Ps1xeMwxf94z8jIQsZebxFuGnMa95UU
-4wBd1ias85fUANUxwpigaBjQee5Hk+dnfUe1snUWYNm9H6tKrXEF8ajer3a2knEv
-GfK0CSEumFougfW2xG88ChGTS60wc+MIRfXERCvWpGm/5EECQQDdv5IBSi89g/R1
-5AGZKFCoqr6Zw5bWEKPzCCYJZzncR1ER9vP2AnMExM8Io/87WYvmpZIUrXJvQYm8
-hkfVOcBZAkEAxY4VcqmRWru3zmnbj21MwcwtgESaONkWsHeYs1C/Y/3zt7TuelYz
-ZJ9aUuUsaiJLEs9Y26nMt0L0snWGr2noEwJBANaDp1PWFyMUTt3pB17JcFXqb15C
-pt1I1cGapWk9Uez1lMijNNhNAEWhuoKqW5Nnif5DN7EHJYfZR8x3vm/YYWkCQHAA
-0iAkCwjKDLe2RIjYiwAE5ncmbdl1GuwJokVnrlrei+LHbb1mSdTuk6MT006JCs8r
-R1GivzHXgCv9fdLN1IkCQHxRvv9RPND80eEkdMv4qu0s22OLRhLQ/pb+YeT5Cjjv
-pJYWKrvXdRZcuNde9JiiTgK2UW1wM8KeD/EGvK2yF6M=
-----END RSA PRIVATE KEY-----
--- a/pkg/adaptors/kubeconfig/load.go
+++ b/pkg/adaptors/kubeconfig/load.go
@@ -11,7 +11,7 @@ import (
 func (*Kubeconfig) GetCurrentAuthProvider(explicitFilename string, contextName ContextName, userName UserName) (*AuthProvider, error) {
 	config, err := loadByDefaultRules(explicitFilename)
 	if err != nil {
-		return nil, xerrors.Errorf("could not load kubeconfig: %w", err)
+		return nil, xerrors.Errorf("could not load the kubeconfig: %w", err)
 	}
 	auth, err := findCurrentAuthProvider(config, contextName, userName)
 	if err != nil {
@@ -25,7 +25,7 @@ func loadByDefaultRules(explicitFilename string) (*api.Config, error) {
 	rules.ExplicitPath = explicitFilename
 	config, err := rules.Load()
 	if err != nil {
-		return nil, xerrors.Errorf("error while loading config: %w", err)
+		return nil, xerrors.Errorf("load error: %w", err)
 	}
 	return config, err
 }
--- a/pkg/adaptors/oidcclient/factory.go
+++ b/pkg/adaptors/oidcclient/factory.go
@@ -4,17 +4,27 @@ package oidcclient
 import (
 	"context"
 	"crypto/tls"
+	"fmt"
 	"net/http"

 	"github.com/coreos/go-oidc"
+	"github.com/google/wire"
 	"github.com/int128/kubelogin/pkg/adaptors/certpool"
+	"github.com/int128/kubelogin/pkg/adaptors/clock"
 	"github.com/int128/kubelogin/pkg/adaptors/logger"
 	"github.com/int128/kubelogin/pkg/adaptors/oidcclient/logging"
 	"golang.org/x/oauth2"
 	"golang.org/x/xerrors"
 )

-type NewFunc func(ctx context.Context, config Config) (Interface, error)
+var Set = wire.NewSet(
+	wire.Struct(new(Factory), "*"),
+	wire.Bind(new(FactoryInterface), new(*Factory)),
+)
+
+type FactoryInterface interface {
+	New(ctx context.Context, config Config) (Interface, error)
+}

 // Config represents a configuration of OpenID Connect client.
 type Config struct {
@@ -24,11 +34,15 @@ type Config struct {
 	ExtraScopes   []string // optional
 	CertPool      certpool.Interface
 	SkipTLSVerify bool
-	Logger        logger.Interface
+}
+
+type Factory struct {
+	Clock  clock.Interface
+	Logger logger.Interface
 }

 // New returns an instance of adaptors.Interface with the given configuration.
-func New(ctx context.Context, config Config) (Interface, error) {
+func (f *Factory) New(ctx context.Context, config Config) (Interface, error) {
 	var tlsConfig tls.Config
 	tlsConfig.InsecureSkipVerify = config.SkipTLSVerify
 	config.CertPool.SetRootCAs(&tlsConfig)
@@ -38,7 +52,7 @@ func New(ctx context.Context, config Config) (Interface, error) {
 	}
 	loggingTransport := &logging.Transport{
 		Base:   baseTransport,
-		Logger: config.Logger,
+		Logger: f.Logger,
 	}
 	httpClient := &http.Client{
 		Transport: loggingTransport,
@@ -47,7 +61,11 @@ func New(ctx context.Context, config Config) (Interface, error) {
 	ctx = context.WithValue(ctx, oauth2.HTTPClient, httpClient)
 	provider, err := oidc.NewProvider(ctx, config.IssuerURL)
 	if err != nil {
-		return nil, xerrors.Errorf("could not discovery the issuer: %w", err)
+		return nil, xerrors.Errorf("oidc discovery error: %w", err)
+	}
+	supportedPKCEMethods, err := extractSupportedPKCEMethods(provider)
+	if err != nil {
+		return nil, xerrors.Errorf("could not determine supported PKCE methods: %w", err)
 	}
 	return &client{
 		httpClient: httpClient,
@@ -58,6 +76,18 @@ func New(ctx context.Context, config Config) (Interface, error) {
 			ClientSecret: config.ClientSecret,
 			Scopes:       append(config.ExtraScopes, oidc.ScopeOpenID),
 		},
-		logger: config.Logger,
+		clock:                f.Clock,
+		logger:               f.Logger,
+		supportedPKCEMethods: supportedPKCEMethods,
 	}, nil
 }
+
+func extractSupportedPKCEMethods(provider *oidc.Provider) ([]string, error) {
+	var d struct {
+		CodeChallengeMethodsSupported []string `json:"code_challenge_methods_supported"`
+	}
+	if err := provider.Claims(&d); err != nil {
+		return nil, fmt.Errorf("invalid discovery document: %w", err)
+	}
+	return d.CodeChallengeMethodsSupported, nil
+}
--- a/pkg/adaptors/oidcclient/logging/transport_test.go
+++ b/pkg/adaptors/oidcclient/logging/transport_test.go
@@ -8,7 +8,7 @@ import (
 	"testing"

 	"github.com/golang/mock/gomock"
-	"github.com/int128/kubelogin/pkg/adaptors/logger/mock_logger"
+	"github.com/int128/kubelogin/pkg/testing/logger"
 )

 type mockTransport struct {
@@ -37,7 +37,7 @@ dummy`)), req)

 	transport := &Transport{
 		Base:   &mockTransport{resp: resp},
-		Logger: mock_logger.New(t),
+		Logger: logger.New(t),
 	}
 	gotResp, err := transport.RoundTrip(req)
 	if err != nil {
--- a/pkg/adaptors/oidcclient/mock_oidcclient/mock_oidcclient.go
+++ b/pkg/adaptors/oidcclient/mock_oidcclient/mock_oidcclient.go
@@ -11,30 +11,30 @@ import (
 	reflect "reflect"
 )

-// MockInterface is a mock of Interface interface
+// MockInterface is a mock of Interface interface.
 type MockInterface struct {
 	ctrl     *gomock.Controller
 	recorder *MockInterfaceMockRecorder
 }

-// MockInterfaceMockRecorder is the mock recorder for MockInterface
+// MockInterfaceMockRecorder is the mock recorder for MockInterface.
 type MockInterfaceMockRecorder struct {
 	mock *MockInterface
 }

-// NewMockInterface creates a new mock instance
+// NewMockInterface creates a new mock instance.
 func NewMockInterface(ctrl *gomock.Controller) *MockInterface {
 	mock := &MockInterface{ctrl: ctrl}
 	mock.recorder = &MockInterfaceMockRecorder{mock}
 	return mock
 }

-// EXPECT returns an object that allows the caller to indicate expected use
+// EXPECT returns an object that allows the caller to indicate expected use.
 func (m *MockInterface) EXPECT() *MockInterfaceMockRecorder {
 	return m.recorder
 }

-// ExchangeAuthCode mocks base method
+// ExchangeAuthCode mocks base method.
 func (m *MockInterface) ExchangeAuthCode(arg0 context.Context, arg1 oidcclient.ExchangeAuthCodeInput) (*oidcclient.TokenSet, error) {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "ExchangeAuthCode", arg0, arg1)
@@ -43,13 +43,13 @@ func (m *MockInterface) ExchangeAuthCode(arg0 context.Context, arg1 oidcclient.E
 	return ret0, ret1
 }

-// ExchangeAuthCode indicates an expected call of ExchangeAuthCode
+// ExchangeAuthCode indicates an expected call of ExchangeAuthCode.
 func (mr *MockInterfaceMockRecorder) ExchangeAuthCode(arg0, arg1 interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "ExchangeAuthCode", reflect.TypeOf((*MockInterface)(nil).ExchangeAuthCode), arg0, arg1)
 }

-// GetAuthCodeURL mocks base method
+// GetAuthCodeURL mocks base method.
 func (m *MockInterface) GetAuthCodeURL(arg0 oidcclient.AuthCodeURLInput) string {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "GetAuthCodeURL", arg0)
@@ -57,13 +57,13 @@ func (m *MockInterface) GetAuthCodeURL(arg0 oidcclient.AuthCodeURLInput) string
 	return ret0
 }

-// GetAuthCodeURL indicates an expected call of GetAuthCodeURL
+// GetAuthCodeURL indicates an expected call of GetAuthCodeURL.
 func (mr *MockInterfaceMockRecorder) GetAuthCodeURL(arg0 interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "GetAuthCodeURL", reflect.TypeOf((*MockInterface)(nil).GetAuthCodeURL), arg0)
 }

-// GetTokenByAuthCode mocks base method
+// GetTokenByAuthCode mocks base method.
 func (m *MockInterface) GetTokenByAuthCode(arg0 context.Context, arg1 oidcclient.GetTokenByAuthCodeInput, arg2 chan<- string) (*oidcclient.TokenSet, error) {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "GetTokenByAuthCode", arg0, arg1, arg2)
@@ -72,13 +72,13 @@ func (m *MockInterface) GetTokenByAuthCode(arg0 context.Context, arg1 oidcclient
 	return ret0, ret1
 }

-// GetTokenByAuthCode indicates an expected call of GetTokenByAuthCode
+// GetTokenByAuthCode indicates an expected call of GetTokenByAuthCode.
 func (mr *MockInterfaceMockRecorder) GetTokenByAuthCode(arg0, arg1, arg2 interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "GetTokenByAuthCode", reflect.TypeOf((*MockInterface)(nil).GetTokenByAuthCode), arg0, arg1, arg2)
 }

-// GetTokenByROPC mocks base method
+// GetTokenByROPC mocks base method.
 func (m *MockInterface) GetTokenByROPC(arg0 context.Context, arg1, arg2 string) (*oidcclient.TokenSet, error) {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "GetTokenByROPC", arg0, arg1, arg2)
@@ -87,13 +87,13 @@ func (m *MockInterface) GetTokenByROPC(arg0 context.Context, arg1, arg2 string)
 	return ret0, ret1
 }

-// GetTokenByROPC indicates an expected call of GetTokenByROPC
+// GetTokenByROPC indicates an expected call of GetTokenByROPC.
 func (mr *MockInterfaceMockRecorder) GetTokenByROPC(arg0, arg1, arg2 interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "GetTokenByROPC", reflect.TypeOf((*MockInterface)(nil).GetTokenByROPC), arg0, arg1, arg2)
 }

-// Refresh mocks base method
+// Refresh mocks base method.
 func (m *MockInterface) Refresh(arg0 context.Context, arg1 string) (*oidcclient.TokenSet, error) {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "Refresh", arg0, arg1)
@@ -102,8 +102,22 @@ func (m *MockInterface) Refresh(arg0 context.Context, arg1 string) (*oidcclient.
 	return ret0, ret1
 }

-// Refresh indicates an expected call of Refresh
+// Refresh indicates an expected call of Refresh.
 func (mr *MockInterfaceMockRecorder) Refresh(arg0, arg1 interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Refresh", reflect.TypeOf((*MockInterface)(nil).Refresh), arg0, arg1)
 }
+
+// SupportedPKCEMethods mocks base method.
+func (m *MockInterface) SupportedPKCEMethods() []string {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "SupportedPKCEMethods")
+	ret0, _ := ret[0].([]string)
+	return ret0
+}
+
+// SupportedPKCEMethods indicates an expected call of SupportedPKCEMethods.
+func (mr *MockInterfaceMockRecorder) SupportedPKCEMethods() *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "SupportedPKCEMethods", reflect.TypeOf((*MockInterface)(nil).SupportedPKCEMethods))
+}
--- a/pkg/adaptors/oidcclient/oidcclient.go
+++ b/pkg/adaptors/oidcclient/oidcclient.go
@@ -2,14 +2,14 @@ package oidcclient

 import (
 	"context"
-	"fmt"
 	"net/http"
 	"time"

 	"github.com/coreos/go-oidc"
-	"github.com/google/wire"
+	"github.com/int128/kubelogin/pkg/adaptors/clock"
 	"github.com/int128/kubelogin/pkg/adaptors/logger"
-	oidcModel "github.com/int128/kubelogin/pkg/domain/oidc"
+	"github.com/int128/kubelogin/pkg/domain/jwt"
+	"github.com/int128/kubelogin/pkg/domain/pkce"
 	"github.com/int128/oauth2cli"
 	"golang.org/x/oauth2"
 	"golang.org/x/xerrors"
@@ -17,39 +17,38 @@ import (

 //go:generate mockgen -destination mock_oidcclient/mock_oidcclient.go github.com/int128/kubelogin/pkg/adaptors/oidcclient Interface

-var Set = wire.NewSet(
-	wire.Value(NewFunc(New)),
-)
-
 type Interface interface {
 	GetAuthCodeURL(in AuthCodeURLInput) string
 	ExchangeAuthCode(ctx context.Context, in ExchangeAuthCodeInput) (*TokenSet, error)
 	GetTokenByAuthCode(ctx context.Context, in GetTokenByAuthCodeInput, localServerReadyChan chan<- string) (*TokenSet, error)
 	GetTokenByROPC(ctx context.Context, username, password string) (*TokenSet, error)
 	Refresh(ctx context.Context, refreshToken string) (*TokenSet, error)
+	SupportedPKCEMethods() []string
 }

 type AuthCodeURLInput struct {
-	State               string
-	Nonce               string
-	CodeChallenge       string
-	CodeChallengeMethod string
-	RedirectURI         string
+	State                  string
+	Nonce                  string
+	PKCEParams             pkce.Params
+	RedirectURI            string
+	AuthRequestExtraParams map[string]string
 }

 type ExchangeAuthCodeInput struct {
-	Code         string
-	CodeVerifier string
-	Nonce        string
-	RedirectURI  string
+	Code        string
+	PKCEParams  pkce.Params
+	Nonce       string
+	RedirectURI string
 }

 type GetTokenByAuthCodeInput struct {
-	BindAddress         []string
-	Nonce               string
-	CodeChallenge       string
-	CodeChallengeMethod string
-	CodeVerifier        string
+	BindAddress            []string
+	State                  string
+	Nonce                  string
+	PKCEParams             pkce.Params
+	RedirectURLHostname    string
+	AuthRequestExtraParams map[string]string
+	LocalServerSuccessHTML string
 }

 // TokenSet represents an output DTO of
@@ -57,14 +56,16 @@ type GetTokenByAuthCodeInput struct {
 type TokenSet struct {
 	IDToken       string
 	RefreshToken  string
-	IDTokenClaims oidcModel.Claims
+	IDTokenClaims jwt.Claims
 }

 type client struct {
-	httpClient   *http.Client
-	provider     *oidc.Provider
-	oauth2Config oauth2.Config
-	logger       logger.Interface
+	httpClient           *http.Client
+	provider             *oidc.Provider
+	oauth2Config         oauth2.Config
+	clock                clock.Interface
+	logger               logger.Interface
+	supportedPKCEMethods []string
 }

 func (c *client) wrapContext(ctx context.Context) context.Context {
@@ -78,22 +79,19 @@ func (c *client) wrapContext(ctx context.Context) context.Context {
 func (c *client) GetTokenByAuthCode(ctx context.Context, in GetTokenByAuthCodeInput, localServerReadyChan chan<- string) (*TokenSet, error) {
 	ctx = c.wrapContext(ctx)
 	config := oauth2cli.Config{
-		OAuth2Config: c.oauth2Config,
-		AuthCodeOptions: []oauth2.AuthCodeOption{
-			oauth2.AccessTypeOffline,
-			oidc.Nonce(in.Nonce),
-			oauth2.SetAuthURLParam("code_challenge", in.CodeChallenge),
-			oauth2.SetAuthURLParam("code_challenge_method", in.CodeChallengeMethod),
-		},
-		TokenRequestOptions: []oauth2.AuthCodeOption{
-			oauth2.SetAuthURLParam("code_verifier", in.CodeVerifier),
-		},
+		OAuth2Config:           c.oauth2Config,
+		State:                  in.State,
+		AuthCodeOptions:        authorizationRequestOptions(in.Nonce, in.PKCEParams, in.AuthRequestExtraParams),
+		TokenRequestOptions:    tokenRequestOptions(in.PKCEParams),
 		LocalServerBindAddress: in.BindAddress,
 		LocalServerReadyChan:   localServerReadyChan,
+		RedirectURLHostname:    in.RedirectURLHostname,
+		LocalServerSuccessHTML: in.LocalServerSuccessHTML,
+		Logf:                   c.logger.V(1).Infof,
 	}
 	token, err := oauth2cli.GetToken(ctx, config)
 	if err != nil {
-		return nil, xerrors.Errorf("could not get a token: %w", err)
+		return nil, xerrors.Errorf("oauth2 error: %w", err)
 	}
 	return c.verifyToken(ctx, token, in.Nonce)
 }
@@ -102,12 +100,8 @@ func (c *client) GetTokenByAuthCode(ctx context.Context, in GetTokenByAuthCodeIn
 func (c *client) GetAuthCodeURL(in AuthCodeURLInput) string {
 	cfg := c.oauth2Config
 	cfg.RedirectURL = in.RedirectURI
-	return cfg.AuthCodeURL(in.State,
-		oauth2.AccessTypeOffline,
-		oidc.Nonce(in.Nonce),
-		oauth2.SetAuthURLParam("code_challenge", in.CodeChallenge),
-		oauth2.SetAuthURLParam("code_challenge_method", in.CodeChallengeMethod),
-	)
+	opts := authorizationRequestOptions(in.Nonce, in.PKCEParams, in.AuthRequestExtraParams)
+	return cfg.AuthCodeURL(in.State, opts...)
 }

 // ExchangeAuthCode exchanges the authorization code and token.
@@ -115,19 +109,50 @@ func (c *client) ExchangeAuthCode(ctx context.Context, in ExchangeAuthCodeInput)
 	ctx = c.wrapContext(ctx)
 	cfg := c.oauth2Config
 	cfg.RedirectURL = in.RedirectURI
-	token, err := cfg.Exchange(ctx, in.Code, oauth2.SetAuthURLParam("code_verifier", in.CodeVerifier))
+	opts := tokenRequestOptions(in.PKCEParams)
+	token, err := cfg.Exchange(ctx, in.Code, opts...)
 	if err != nil {
-		return nil, xerrors.Errorf("could not exchange the authorization code: %w", err)
+		return nil, xerrors.Errorf("exchange error: %w", err)
 	}
 	return c.verifyToken(ctx, token, in.Nonce)
 }

+func authorizationRequestOptions(n string, p pkce.Params, e map[string]string) []oauth2.AuthCodeOption {
+	o := []oauth2.AuthCodeOption{
+		oauth2.AccessTypeOffline,
+		oidc.Nonce(n),
+	}
+	if !p.IsZero() {
+		o = append(o,
+			oauth2.SetAuthURLParam("code_challenge", p.CodeChallenge),
+			oauth2.SetAuthURLParam("code_challenge_method", p.CodeChallengeMethod),
+		)
+	}
+	for key, value := range e {
+		o = append(o, oauth2.SetAuthURLParam(key, value))
+	}
+	return o
+}
+
+func tokenRequestOptions(p pkce.Params) (o []oauth2.AuthCodeOption) {
+	if !p.IsZero() {
+		o = append(o, oauth2.SetAuthURLParam("code_verifier", p.CodeVerifier))
+	}
+	return
+}
+
+// SupportedPKCEMethods returns the PKCE methods supported by the provider.
+// This may return nil if PKCE is not supported.
+func (c *client) SupportedPKCEMethods() []string {
+	return c.supportedPKCEMethods
+}
+
 // GetTokenByROPC performs the resource owner password credentials flow.
 func (c *client) GetTokenByROPC(ctx context.Context, username, password string) (*TokenSet, error) {
 	ctx = c.wrapContext(ctx)
 	token, err := c.oauth2Config.PasswordCredentialsToken(ctx, username, password)
 	if err != nil {
-		return nil, xerrors.Errorf("could not get a token: %w", err)
+		return nil, xerrors.Errorf("resource owner password credentials flow error: %w", err)
 	}
 	return c.verifyToken(ctx, token, "")
 }
@@ -150,49 +175,29 @@ func (c *client) Refresh(ctx context.Context, refreshToken string) (*TokenSet, e
 // verifyToken verifies the token with the certificates of the provider and the nonce.
 // If the nonce is an empty string, it does not verify the nonce.
 func (c *client) verifyToken(ctx context.Context, token *oauth2.Token, nonce string) (*TokenSet, error) {
-	idTokenString, ok := token.Extra("id_token").(string)
+	idToken, ok := token.Extra("id_token").(string)
 	if !ok {
 		return nil, xerrors.Errorf("id_token is missing in the token response: %s", token)
 	}
-	verifier := c.provider.Verifier(&oidc.Config{ClientID: c.oauth2Config.ClientID})
-	idToken, err := verifier.Verify(ctx, idTokenString)
+	verifier := c.provider.Verifier(&oidc.Config{ClientID: c.oauth2Config.ClientID, Now: c.clock.Now})
+	verifiedIDToken, err := verifier.Verify(ctx, idToken)
 	if err != nil {
 		return nil, xerrors.Errorf("could not verify the ID token: %w", err)
 	}
-	if nonce != "" && nonce != idToken.Nonce {
-		return nil, xerrors.Errorf("nonce did not match (wants %s but was %s)", nonce, idToken.Nonce)
+	if nonce != "" && nonce != verifiedIDToken.Nonce {
+		return nil, xerrors.Errorf("nonce did not match (wants %s but got %s)", nonce, verifiedIDToken.Nonce)
 	}
-	claims, err := dumpClaims(idToken)
+	pretty, err := jwt.DecodePayloadAsPrettyJSON(idToken)
 	if err != nil {
-		c.logger.V(1).Infof("incomplete claims of the ID token: %w", err)
+		return nil, xerrors.Errorf("could not decode the token: %w", err)
 	}
 	return &TokenSet{
-		IDToken:       idTokenString,
-		IDTokenClaims: claims,
-		RefreshToken:  token.RefreshToken,
+		IDToken: idToken,
+		IDTokenClaims: jwt.Claims{
+			Subject: verifiedIDToken.Subject,
+			Expiry:  verifiedIDToken.Expiry,
+			Pretty:  pretty,
+		},
+		RefreshToken: token.RefreshToken,
 	}, nil
 }
-
-func dumpClaims(token *oidc.IDToken) (oidcModel.Claims, error) {
-	var rawClaims map[string]interface{}
-	err := token.Claims(&rawClaims)
-	pretty := dumpRawClaims(rawClaims)
-	return oidcModel.Claims{
-		Subject: token.Subject,
-		Expiry:  token.Expiry,
-		Pretty:  pretty,
-	}, err
-}
-
-func dumpRawClaims(rawClaims map[string]interface{}) map[string]string {
-	claims := make(map[string]string)
-	for k, v := range rawClaims {
-		switch v := v.(type) {
-		case float64:
-			claims[k] = fmt.Sprintf("%.f", v)
-		default:
-			claims[k] = fmt.Sprintf("%v", v)
-		}
-	}
-	return claims
-}
--- a/pkg/adaptors/reader/mock_reader/mock_reader.go
+++ b/pkg/adaptors/reader/mock_reader/mock_reader.go
@@ -1,13 +1,12 @@
 // Code generated by MockGen. DO NOT EDIT.
-// Source: github.com/int128/kubelogin/pkg/adaptors/env (interfaces: Interface)
+// Source: github.com/int128/kubelogin/pkg/adaptors/reader (interfaces: Interface)

-// Package mock_env is a generated GoMock package.
-package mock_env
+// Package mock_reader is a generated GoMock package.
+package mock_reader

 import (
 	gomock "github.com/golang/mock/gomock"
 	reflect "reflect"
-	time "time"
 )

 // MockInterface is a mock of Interface interface
@@ -33,20 +32,6 @@ func (m *MockInterface) EXPECT() *MockInterfaceMockRecorder {
 	return m.recorder
 }

-// Now mocks base method
-func (m *MockInterface) Now() time.Time {
-	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "Now")
-	ret0, _ := ret[0].(time.Time)
-	return ret0
-}
-
-// Now indicates an expected call of Now
-func (mr *MockInterfaceMockRecorder) Now() *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Now", reflect.TypeOf((*MockInterface)(nil).Now))
-}
-
 // ReadPassword mocks base method
 func (m *MockInterface) ReadPassword(arg0 string) (string, error) {
 	m.ctrl.T.Helper()
--- a/pkg/adaptors/reader/reader.go
+++ b/pkg/adaptors/reader/reader.go
@@ -0,0 +1,61 @@
+// Package reader provides the reader of standard input.
+package reader
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strings"
+	"syscall"
+
+	"github.com/google/wire"
+	"github.com/int128/kubelogin/pkg/adaptors/stdio"
+	"golang.org/x/crypto/ssh/terminal"
+	"golang.org/x/xerrors"
+)
+
+//go:generate mockgen -destination mock_reader/mock_reader.go github.com/int128/kubelogin/pkg/adaptors/reader Interface
+
+// Set provides an implementation and interface for Reader.
+var Set = wire.NewSet(
+	wire.Struct(new(Reader), "*"),
+	wire.Bind(new(Interface), new(*Reader)),
+)
+
+type Interface interface {
+	ReadString(prompt string) (string, error)
+	ReadPassword(prompt string) (string, error)
+}
+
+type Reader struct {
+	Stdin stdio.Stdin
+}
+
+// ReadString reads a string from the stdin.
+func (x *Reader) ReadString(prompt string) (string, error) {
+	if _, err := fmt.Fprint(os.Stderr, prompt); err != nil {
+		return "", xerrors.Errorf("write error: %w", err)
+	}
+	r := bufio.NewReader(x.Stdin)
+	s, err := r.ReadString('\n')
+	if err != nil {
+		return "", xerrors.Errorf("read error: %w", err)
+	}
+	s = strings.TrimRight(s, "\r\n")
+	return s, nil
+}
+
+// ReadPassword reads a password from the stdin without echo back.
+func (*Reader) ReadPassword(prompt string) (string, error) {
+	if _, err := fmt.Fprint(os.Stderr, prompt); err != nil {
+		return "", xerrors.Errorf("write error: %w", err)
+	}
+	b, err := terminal.ReadPassword(int(syscall.Stdin))
+	if err != nil {
+		return "", xerrors.Errorf("read error: %w", err)
+	}
+	if _, err := fmt.Fprintln(os.Stderr); err != nil {
+		return "", xerrors.Errorf("write error: %w", err)
+	}
+	return string(b), nil
+}
--- a/pkg/adaptors/stdio/stdio.go
+++ b/pkg/adaptors/stdio/stdio.go
@@ -0,0 +1,17 @@
+// Package stdio wraps os.Stdin and os.Stdout for testing.
+package stdio
+
+import (
+	"io"
+	"os"
+
+	"github.com/google/wire"
+)
+
+var Set = wire.NewSet(
+	wire.InterfaceValue(new(Stdin), os.Stdin),
+	wire.InterfaceValue(new(Stdout), os.Stdout),
+)
+
+type Stdout io.Writer
+type Stdin io.Reader
--- a/pkg/adaptors/tokencache/tokencache.go
+++ b/pkg/adaptors/tokencache/tokencache.go
@@ -60,7 +60,7 @@ func (r *Repository) FindByKey(dir string, key Key) (*Value, error) {
 	d := json.NewDecoder(f)
 	var c Value
 	if err := d.Decode(&c); err != nil {
-		return nil, xerrors.Errorf("could not decode json file %s: %w", p, err)
+		return nil, xerrors.Errorf("invalid json file %s: %w", p, err)
 	}
 	return &c, nil
 }
@@ -81,7 +81,7 @@ func (r *Repository) Save(dir string, key Key, value Value) error {
 	defer f.Close()
 	e := json.NewEncoder(f)
 	if err := e.Encode(&value); err != nil {
-		return xerrors.Errorf("could not encode json to file %s: %w", p, err)
+		return xerrors.Errorf("json encode error: %w", err)
 	}
 	return nil
 }
--- a/pkg/di/di.go
+++ b/pkg/di/di.go
@@ -7,13 +7,14 @@ import (
 	"github.com/google/wire"
 	"github.com/int128/kubelogin/pkg/adaptors/browser"
 	"github.com/int128/kubelogin/pkg/adaptors/certpool"
+	"github.com/int128/kubelogin/pkg/adaptors/clock"
 	"github.com/int128/kubelogin/pkg/adaptors/cmd"
 	"github.com/int128/kubelogin/pkg/adaptors/credentialpluginwriter"
-	"github.com/int128/kubelogin/pkg/adaptors/env"
-	"github.com/int128/kubelogin/pkg/adaptors/jwtdecoder"
 	"github.com/int128/kubelogin/pkg/adaptors/kubeconfig"
 	"github.com/int128/kubelogin/pkg/adaptors/logger"
 	"github.com/int128/kubelogin/pkg/adaptors/oidcclient"
+	"github.com/int128/kubelogin/pkg/adaptors/reader"
+	"github.com/int128/kubelogin/pkg/adaptors/stdio"
 	"github.com/int128/kubelogin/pkg/adaptors/tokencache"
 	"github.com/int128/kubelogin/pkg/usecases/authentication"
 	"github.com/int128/kubelogin/pkg/usecases/credentialplugin"
@@ -27,15 +28,16 @@ func NewCmd() cmd.Interface {
 		NewCmdForHeadless,

 		// dependencies for production
+		clock.Set,
+		stdio.Set,
 		logger.Set,
 		browser.Set,
-		credentialpluginwriter.Set,
 	)
 	return nil
 }

 // NewCmdForHeadless returns an instance of adaptors.Cmd for headless testing.
-func NewCmdForHeadless(logger.Interface, browser.Interface, credentialpluginwriter.Interface) cmd.Interface {
+func NewCmdForHeadless(clock.Interface, stdio.Stdin, stdio.Stdout, logger.Interface, browser.Interface) cmd.Interface {
 	wire.Build(
 		// use-cases
 		authentication.Set,
@@ -45,12 +47,12 @@ func NewCmdForHeadless(logger.Interface, browser.Interface, credentialpluginwrit

 		// adaptors
 		cmd.Set,
-		env.Set,
+		reader.Set,
 		kubeconfig.Set,
 		tokencache.Set,
 		oidcclient.Set,
-		jwtdecoder.Set,
 		certpool.Set,
+		credentialpluginwriter.Set,
 	)
 	return nil
 }
--- a/pkg/di/wire_gen.go
+++ b/pkg/di/wire_gen.go
@@ -8,52 +8,63 @@ package di
 import (
 	"github.com/int128/kubelogin/pkg/adaptors/browser"
 	"github.com/int128/kubelogin/pkg/adaptors/certpool"
+	"github.com/int128/kubelogin/pkg/adaptors/clock"
 	"github.com/int128/kubelogin/pkg/adaptors/cmd"
 	"github.com/int128/kubelogin/pkg/adaptors/credentialpluginwriter"
-	"github.com/int128/kubelogin/pkg/adaptors/env"
-	"github.com/int128/kubelogin/pkg/adaptors/jwtdecoder"
 	"github.com/int128/kubelogin/pkg/adaptors/kubeconfig"
 	"github.com/int128/kubelogin/pkg/adaptors/logger"
 	"github.com/int128/kubelogin/pkg/adaptors/oidcclient"
+	"github.com/int128/kubelogin/pkg/adaptors/reader"
+	"github.com/int128/kubelogin/pkg/adaptors/stdio"
 	"github.com/int128/kubelogin/pkg/adaptors/tokencache"
 	"github.com/int128/kubelogin/pkg/usecases/authentication"
 	"github.com/int128/kubelogin/pkg/usecases/credentialplugin"
 	"github.com/int128/kubelogin/pkg/usecases/setup"
 	"github.com/int128/kubelogin/pkg/usecases/standalone"
+	"os"
 )

 // Injectors from di.go:

 func NewCmd() cmd.Interface {
+	clockReal := &clock.Real{}
+	stdin := _wireFileValue
+	stdout := _wireOsFileValue
 	loggerInterface := logger.New()
 	browserBrowser := &browser.Browser{}
-	writer := &credentialpluginwriter.Writer{}
-	cmdInterface := NewCmdForHeadless(loggerInterface, browserBrowser, writer)
+	cmdInterface := NewCmdForHeadless(clockReal, stdin, stdout, loggerInterface, browserBrowser)
 	return cmdInterface
 }

-func NewCmdForHeadless(loggerInterface logger.Interface, browserInterface browser.Interface, credentialpluginwriterInterface credentialpluginwriter.Interface) cmd.Interface {
-	newFunc := _wireNewFuncValue
-	decoder := &jwtdecoder.Decoder{}
-	envEnv := &env.Env{}
+var (
+	_wireFileValue   = os.Stdin
+	_wireOsFileValue = os.Stdout
+)
+
+func NewCmdForHeadless(clockInterface clock.Interface, stdin stdio.Stdin, stdout stdio.Stdout, loggerInterface logger.Interface, browserInterface browser.Interface) cmd.Interface {
+	factory := &oidcclient.Factory{
+		Clock:  clockInterface,
+		Logger: loggerInterface,
+	}
 	authCode := &authentication.AuthCode{
-		Env:     envEnv,
 		Browser: browserInterface,
 		Logger:  loggerInterface,
 	}
+	readerReader := &reader.Reader{
+		Stdin: stdin,
+	}
 	authCodeKeyboard := &authentication.AuthCodeKeyboard{
-		Env:    envEnv,
+		Reader: readerReader,
 		Logger: loggerInterface,
 	}
 	ropc := &authentication.ROPC{
-		Env:    envEnv,
+		Reader: readerReader,
 		Logger: loggerInterface,
 	}
 	authenticationAuthentication := &authentication.Authentication{
-		NewOIDCClient:    newFunc,
-		JWTDecoder:       decoder,
+		OIDCClient:       factory,
 		Logger:           loggerInterface,
-		Env:              envEnv,
+		Clock:            clockInterface,
 		AuthCode:         authCode,
 		AuthCodeKeyboard: authCodeKeyboard,
 		ROPC:             ropc,
@@ -61,11 +72,11 @@ func NewCmdForHeadless(loggerInterface logger.Interface, browserInterface browse
 	kubeconfigKubeconfig := &kubeconfig.Kubeconfig{
 		Logger: loggerInterface,
 	}
-	certpoolNewFunc := _wireCertpoolNewFuncValue
+	newFunc := _wireNewFuncValue
 	standaloneStandalone := &standalone.Standalone{
 		Authentication: authenticationAuthentication,
 		Kubeconfig:     kubeconfigKubeconfig,
-		NewCertPool:    certpoolNewFunc,
+		NewCertPool:    newFunc,
 		Logger:         loggerInterface,
 	}
 	root := &cmd.Root{
@@ -73,11 +84,14 @@ func NewCmdForHeadless(loggerInterface logger.Interface, browserInterface browse
 		Logger:     loggerInterface,
 	}
 	repository := &tokencache.Repository{}
+	writer := &credentialpluginwriter.Writer{
+		Stdout: stdout,
+	}
 	getToken := &credentialplugin.GetToken{
 		Authentication:       authenticationAuthentication,
 		TokenCacheRepository: repository,
-		NewCertPool:          certpoolNewFunc,
-		Writer:               credentialpluginwriterInterface,
+		NewCertPool:          newFunc,
+		Writer:               writer,
 		Logger:               loggerInterface,
 	}
 	cmdGetToken := &cmd.GetToken{
@@ -86,7 +100,7 @@ func NewCmdForHeadless(loggerInterface logger.Interface, browserInterface browse
 	}
 	setupSetup := &setup.Setup{
 		Authentication: authenticationAuthentication,
-		NewCertPool:    certpoolNewFunc,
+		NewCertPool:    newFunc,
 		Logger:         loggerInterface,
 	}
 	cmdSetup := &cmd.Setup{
@@ -102,6 +116,5 @@ func NewCmdForHeadless(loggerInterface logger.Interface, browserInterface browse
 }

 var (
-	_wireNewFuncValue         = oidcclient.NewFunc(oidcclient.New)
-	_wireCertpoolNewFuncValue = certpool.NewFunc(certpool.New)
+	_wireNewFuncValue = certpool.NewFunc(certpool.New)
 )
--- a/pkg/domain/jwt/decode.go
+++ b/pkg/domain/jwt/decode.go
@@ -0,0 +1,72 @@
+// Package jwt provides JWT manipulations.
+// See https://tools.ietf.org/html/rfc7519#section-4.1.3
+package jwt
+
+import (
+	"bytes"
+	"encoding/base64"
+	"encoding/json"
+	"strings"
+	"time"
+
+	"golang.org/x/xerrors"
+)
+
+// DecodeWithoutVerify decodes the JWT string and returns the claims.
+// Note that this method does not verify the signature and always trust it.
+func DecodeWithoutVerify(s string) (*Claims, error) {
+	payload, err := DecodePayloadAsRawJSON(s)
+	if err != nil {
+		return nil, xerrors.Errorf("could not decode the payload: %w", err)
+	}
+	var claims struct {
+		Subject   string `json:"sub,omitempty"`
+		ExpiresAt int64  `json:"exp,omitempty"`
+	}
+	if err := json.NewDecoder(bytes.NewReader(payload)).Decode(&claims); err != nil {
+		return nil, xerrors.Errorf("could not decode the json of token: %w", err)
+	}
+	var prettyJson bytes.Buffer
+	if err := json.Indent(&prettyJson, payload, "", "  "); err != nil {
+		return nil, xerrors.Errorf("could not indent the json of token: %w", err)
+	}
+	return &Claims{
+		Subject: claims.Subject,
+		Expiry:  time.Unix(claims.ExpiresAt, 0),
+		Pretty:  prettyJson.String(),
+	}, nil
+}
+
+// DecodePayloadAsPrettyJSON decodes the JWT string and returns the pretty JSON string.
+func DecodePayloadAsPrettyJSON(s string) (string, error) {
+	payload, err := DecodePayloadAsRawJSON(s)
+	if err != nil {
+		return "", xerrors.Errorf("could not decode the payload: %w", err)
+	}
+	var prettyJson bytes.Buffer
+	if err := json.Indent(&prettyJson, payload, "", "  "); err != nil {
+		return "", xerrors.Errorf("could not indent the json of token: %w", err)
+	}
+	return prettyJson.String(), nil
+}
+
+// DecodePayloadAsRawJSON extracts the payload and returns the raw JSON.
+func DecodePayloadAsRawJSON(s string) ([]byte, error) {
+	parts := strings.SplitN(s, ".", 3)
+	if len(parts) != 3 {
+		return nil, xerrors.Errorf("wants %d segments but got %d segments", 3, len(parts))
+	}
+	payloadJSON, err := decodePayload(parts[1])
+	if err != nil {
+		return nil, xerrors.Errorf("could not decode the payload: %w", err)
+	}
+	return payloadJSON, nil
+}
+
+func decodePayload(payload string) ([]byte, error) {
+	b, err := base64.URLEncoding.WithPadding(base64.NoPadding).DecodeString(payload)
+	if err != nil {
+		return nil, xerrors.Errorf("invalid base64: %w", err)
+	}
+	return b, nil
+}
--- a/pkg/domain/jwt/decode_test.go
+++ b/pkg/domain/jwt/decode_test.go
@@ -0,0 +1,48 @@
+package jwt
+
+import (
+	"testing"
+	"time"
+
+	"github.com/google/go-cmp/cmp"
+)
+
+func TestDecode(t *testing.T) {
+	t.Run("ValidToken", func(t *testing.T) {
+		const (
+			// https://tools.ietf.org/html/rfc7519#section-3.1
+			header    = "eyJ0eXAiOiJKV1QiLA0KICJhbGciOiJIUzI1NiJ9"
+			payload   = "eyJpc3MiOiJqb2UiLA0KICJleHAiOjEzMDA4MTkzODAsDQogImh0dHA6Ly9leGFtcGxlLmNvbS9pc19yb290Ijp0cnVlfQ"
+			signature = "dBjftJeZ4CVP-mB92K27uhbUJU1p1r_wW1gFWFOEjXk"
+			token     = header + "." + payload + "." + signature
+		)
+		got, err := DecodeWithoutVerify(token)
+		if err != nil {
+			t.Fatalf("Decode error: %s", err)
+		}
+		want := &Claims{
+			Subject: "",
+			Expiry:  time.Unix(1300819380, 0),
+			Pretty: `{
+  "iss": "joe",
+  "exp": 1300819380,
+  "http://example.com/is_root": true
+}`,
+		}
+		if diff := cmp.Diff(want, got); diff != "" {
+			t.Errorf("mismatch (-want +got):\n%s", diff)
+		}
+	})
+
+	t.Run("InvalidToken", func(t *testing.T) {
+		decodedToken, err := DecodeWithoutVerify("HEADER.INVALID_TOKEN.SIGNATURE")
+		if err == nil {
+			t.Errorf("error wants non-nil but nil")
+		} else {
+			t.Logf("expected error: %+v", err)
+		}
+		if decodedToken != nil {
+			t.Errorf("decodedToken wants nil but %+v", decodedToken)
+		}
+	})
+}
--- a/pkg/domain/jwt/token.go
+++ b/pkg/domain/jwt/token.go
@@ -0,0 +1,20 @@
+package jwt
+
+import "time"
+
+// Claims represents claims of an ID token.
+type Claims struct {
+	Subject string
+	Expiry  time.Time
+	Pretty  string // string representation for debug and logging
+}
+
+// Clock provides the current time.
+type Clock interface {
+	Now() time.Time
+}
+
+// IsExpired returns true if the token is expired.
+func (c *Claims) IsExpired(clock Clock) bool {
+	return c.Expiry.Before(clock.Now())
+}
--- a/pkg/domain/oidc/token_test.go
+++ b/pkg/domain/oidc/token_test.go
@@ -1,10 +1,10 @@
-package oidc_test
+package jwt_test

 import (
 	"testing"
 	"time"

-	"github.com/int128/kubelogin/pkg/domain/oidc"
+	"github.com/int128/kubelogin/pkg/domain/jwt"
 )

 type timeProvider time.Time
@@ -14,7 +14,7 @@ func (tp timeProvider) Now() time.Time {
 }

 func TestClaims_IsExpired(t *testing.T) {
-	claims := oidc.Claims{
+	claims := jwt.Claims{
 		Expiry: time.Date(2019, 1, 2, 3, 4, 5, 0, time.UTC),
 	}

--- a/pkg/domain/oidc/oidc.go
+++ b/pkg/domain/oidc/oidc.go
@@ -2,10 +2,8 @@ package oidc

 import (
 	"crypto/rand"
-	"crypto/sha256"
 	"encoding/base64"
 	"encoding/binary"
-	"strings"

 	"golang.org/x/xerrors"
 )
@@ -26,40 +24,14 @@ func NewNonce() (string, error) {
 	return base64URLEncode(b), nil
 }

-type PKCEParams struct {
-	CodeChallenge       string
-	CodeChallengeMethod string
-	CodeVerifier        string
-}
-
-func NewPKCEParams() (*PKCEParams, error) {
-	b, err := random32()
-	if err != nil {
-		return nil, xerrors.Errorf("could not generate a random: %w", err)
-	}
-	s := computeS256(b)
-	return &s, nil
-}
-
 func random32() ([]byte, error) {
 	b := make([]byte, 32)
 	if err := binary.Read(rand.Reader, binary.LittleEndian, b); err != nil {
-		return nil, xerrors.Errorf("could not read: %w", err)
+		return nil, xerrors.Errorf("read error: %w", err)
 	}
 	return b, nil
 }

-func computeS256(b []byte) PKCEParams {
-	v := base64URLEncode(b)
-	s := sha256.New()
-	_, _ = s.Write([]byte(v))
-	return PKCEParams{
-		CodeChallenge:       base64URLEncode(s.Sum(nil)),
-		CodeChallengeMethod: "S256",
-		CodeVerifier:        v,
-	}
-}
-
 func base64URLEncode(b []byte) string {
-	return strings.TrimRight(base64.URLEncoding.EncodeToString(b), "=")
+	return base64.URLEncoding.WithPadding(base64.NoPadding).EncodeToString(b)
 }
--- a/pkg/domain/oidc/oidc_test.go
+++ b/pkg/domain/oidc/oidc_test.go
@@ -1,25 +0,0 @@
-package oidc
-
-import (
-	"testing"
-)
-
-func Test_computeS256(t *testing.T) {
-	// Testdata described at:
-	// https://tools.ietf.org/html/rfc7636#appendix-B
-	b := []byte{
-		116, 24, 223, 180, 151, 153, 224, 37, 79, 250, 96, 125, 216, 173,
-		187, 186, 22, 212, 37, 77, 105, 214, 191, 240, 91, 88, 5, 88, 83,
-		132, 141, 121,
-	}
-	p := computeS256(b)
-	if want := "dBjftJeZ4CVP-mB92K27uhbUJU1p1r_wW1gFWFOEjXk"; want != p.CodeVerifier {
-		t.Errorf("CodeVerifier wants %s but was %s", want, p.CodeVerifier)
-	}
-	if want := "E9Melhoa2OwvFrEMTJguCHaoeK1t8URWbuGJSstw-cM"; want != p.CodeChallenge {
-		t.Errorf("CodeChallenge wants %s but was %s", want, p.CodeChallenge)
-	}
-	if p.CodeChallengeMethod != "S256" {
-		t.Errorf("CodeChallengeMethod wants S256 but was %s", p.CodeChallengeMethod)
-	}
-}
--- a/pkg/domain/oidc/token.go
+++ b/pkg/domain/oidc/token.go
@@ -1,20 +0,0 @@
-package oidc
-
-import "time"
-
-// Claims represents claims of an ID token.
-type Claims struct {
-	Subject string
-	Expiry  time.Time
-	Pretty  map[string]string // string representation for debug and logging
-}
-
-// TimeProvider provides the current time.
-type TimeProvider interface {
-	Now() time.Time
-}
-
-// IsExpired returns true if the token is expired.
-func (c *Claims) IsExpired(timeProvider TimeProvider) bool {
-	return c.Expiry.Before(timeProvider.Now())
-}
--- a/pkg/domain/pkce/pkce.go
+++ b/pkg/domain/pkce/pkce.go
@@ -0,0 +1,74 @@
+// Package pkce provides generation of the PKCE parameters.
+// See also https://tools.ietf.org/html/rfc7636.
+package pkce
+
+import (
+	"crypto/rand"
+	"crypto/sha256"
+	"encoding/base64"
+	"encoding/binary"
+
+	"golang.org/x/xerrors"
+)
+
+var Plain Params
+
+const (
+	// code challenge methods defined as https://tools.ietf.org/html/rfc7636#section-4.3
+	methodS256 = "S256"
+)
+
+// Params represents a set of the PKCE parameters.
+type Params struct {
+	CodeChallenge       string
+	CodeChallengeMethod string
+	CodeVerifier        string
+}
+
+func (p Params) IsZero() bool {
+	return p == Params{}
+}
+
+// New returns a parameters supported by the provider.
+// You need to pass the code challenge methods defined in RFC7636.
+// It returns Plain if no method is available.
+func New(methods []string) (Params, error) {
+	for _, method := range methods {
+		if method == methodS256 {
+			return NewS256()
+		}
+	}
+	return Plain, nil
+}
+
+// NewS256 generates a parameters for S256.
+func NewS256() (Params, error) {
+	b, err := random32()
+	if err != nil {
+		return Plain, xerrors.Errorf("could not generate a random: %w", err)
+	}
+	return computeS256(b), nil
+}
+
+func random32() ([]byte, error) {
+	b := make([]byte, 32)
+	if err := binary.Read(rand.Reader, binary.LittleEndian, b); err != nil {
+		return nil, xerrors.Errorf("read error: %w", err)
+	}
+	return b, nil
+}
+
+func computeS256(b []byte) Params {
+	v := base64URLEncode(b)
+	s := sha256.New()
+	_, _ = s.Write([]byte(v))
+	return Params{
+		CodeChallenge:       base64URLEncode(s.Sum(nil)),
+		CodeChallengeMethod: methodS256,
+		CodeVerifier:        v,
+	}
+}
+
+func base64URLEncode(b []byte) string {
+	return base64.URLEncoding.WithPadding(base64.NoPadding).EncodeToString(b)
+}
--- a/pkg/domain/pkce/pkce_test.go
+++ b/pkg/domain/pkce/pkce_test.go
@@ -0,0 +1,61 @@
+package pkce
+
+import (
+	"testing"
+)
+
+func TestNew(t *testing.T) {
+	t.Run("S256", func(t *testing.T) {
+		p, err := New([]string{"plain", "S256"})
+		if err != nil {
+			t.Fatalf("New error: %s", err)
+		}
+		if p.CodeChallengeMethod != "S256" {
+			t.Errorf("CodeChallengeMethod wants S256 but was %s", p.CodeChallengeMethod)
+		}
+		if p.CodeChallenge == "" {
+			t.Errorf("CodeChallenge wants non-empty but was empty")
+		}
+		if p.CodeVerifier == "" {
+			t.Errorf("CodeVerifier wants non-empty but was empty")
+		}
+	})
+	t.Run("plain", func(t *testing.T) {
+		p, err := New([]string{"plain"})
+		if err != nil {
+			t.Fatalf("New error: %s", err)
+		}
+		if !p.IsZero() {
+			t.Errorf("IsZero wants true but was false")
+		}
+	})
+	t.Run("nil", func(t *testing.T) {
+		p, err := New(nil)
+		if err != nil {
+			t.Fatalf("New error: %s", err)
+		}
+		if !p.IsZero() {
+			t.Errorf("IsZero wants true but was false")
+		}
+	})
+}
+
+func Test_computeS256(t *testing.T) {
+	// Testdata described at:
+	// https://tools.ietf.org/html/rfc7636#appendix-B
+	b := []byte{
+		116, 24, 223, 180, 151, 153, 224, 37, 79, 250, 96, 125, 216, 173,
+		187, 186, 22, 212, 37, 77, 105, 214, 191, 240, 91, 88, 5, 88, 83,
+		132, 141, 121,
+	}
+	p := computeS256(b)
+	if want := "dBjftJeZ4CVP-mB92K27uhbUJU1p1r_wW1gFWFOEjXk"; want != p.CodeVerifier {
+		t.Errorf("CodeVerifier wants %s but was %s", want, p.CodeVerifier)
+	}
+	if want := "E9Melhoa2OwvFrEMTJguCHaoeK1t8URWbuGJSstw-cM"; want != p.CodeChallenge {
+		t.Errorf("CodeChallenge wants %s but was %s", want, p.CodeChallenge)
+	}
+	if p.CodeChallengeMethod != "S256" {
+		t.Errorf("CodeChallengeMethod wants S256 but was %s", p.CodeChallengeMethod)
+	}
+}
--- a/pkg/templates/authcode_browser.go
+++ b/pkg/templates/authcode_browser.go
@@ -0,0 +1,35 @@
+package templates
+
+// AuthCodeBrowserSuccessHTML is the success page on browser based authentication.
+const AuthCodeBrowserSuccessHTML = `
+<!DOCTYPE html>
+<html lang="en">
+<head>
+	<meta charset="UTF-8">
+	<title>Authenticated</title>
+	<script>
+		window.close()
+	</script>
+	<style>
+		body {
+			background-color: #eee;
+			margin: 0;
+			padding: 0;
+			font-family: sans-serif;
+		}
+		.placeholder {
+			margin: 2em;
+			padding: 2em;
+			background-color: #fff;
+			border-radius: 1em;
+		}
+	</style>
+</head>
+<body>
+	<div class="placeholder">
+		<h1>Authenticated</h1>
+		<p>You have logged in to the cluster. You can close this window.</p>
+	</div>
+</body>
+</html>
+`
--- a/pkg/templates/httpserver/httpserver.go
+++ b/pkg/templates/httpserver/httpserver.go
@@ -0,0 +1,29 @@
+package main
+
+import (
+	"log"
+	"net/http"
+
+	"github.com/int128/kubelogin/pkg/templates"
+)
+
+func main() {
+	http.HandleFunc("/AuthCodeBrowserSuccessHTML", func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Add("content-type", "text/html")
+		_, _ = w.Write([]byte(templates.AuthCodeBrowserSuccessHTML))
+	})
+	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Add("content-type", "text/html")
+		_, _ = w.Write([]byte(`
+<html>
+<body>
+<ul>
+<li><a href="AuthCodeBrowserSuccessHTML">AuthCodeBrowserSuccessHTML</a></li>
+</ul>
+</body>
+</html>
+`))
+	})
+	log.Printf("http://localhost:8000")
+	log.Fatal(http.ListenAndServe("127.0.0.1:8000", nil))
+}
--- a/pkg/templates/package.go
+++ b/pkg/templates/package.go
@@ -0,0 +1,6 @@
+// Package templates provides templates such as HTML and messages.
+//
+// You can preview HTML pages by running httpserver package.
+//	go run ./httpserver
+//
+package templates
--- a/pkg/testing/clock/clock.go
+++ b/pkg/testing/clock/clock.go
@@ -0,0 +1,9 @@
+package clock
+
+import "time"
+
+type Fake time.Time
+
+func (f Fake) Now() time.Time {
+	return time.Time(f)
+}
--- a/pkg/testing/jwt/encode.go
+++ b/pkg/testing/jwt/encode.go
@@ -0,0 +1,43 @@
+package jwt
+
+import (
+	"crypto/rand"
+	"crypto/rsa"
+	"testing"
+
+	"github.com/dgrijalva/jwt-go"
+)
+
+var PrivateKey = generateKey(1024)
+
+func generateKey(b int) *rsa.PrivateKey {
+	k, err := rsa.GenerateKey(rand.Reader, b)
+	if err != nil {
+		panic(err)
+	}
+	return k
+}
+
+type Claims struct {
+	jwt.StandardClaims
+	// aud claim is either a string or an array of strings.
+	// https://tools.ietf.org/html/rfc7519#section-4.1.3
+	Audience      []string `json:"aud,omitempty"`
+	Nonce         string   `json:"nonce,omitempty"`
+	Groups        []string `json:"groups,omitempty"`
+	EmailVerified bool     `json:"email_verified,omitempty"`
+}
+
+func Encode(t *testing.T, claims Claims) string {
+	s, err := jwt.NewWithClaims(jwt.SigningMethodRS256, claims).SignedString(PrivateKey)
+	if err != nil {
+		t.Fatalf("could not encode JWT: %s", err)
+	}
+	return s
+}
+
+func EncodeF(t *testing.T, mutation func(*Claims)) string {
+	var claims Claims
+	mutation(&claims)
+	return Encode(t, claims)
+}
--- a/pkg/adaptors/logger/mock_logger/logger.go
+++ b/pkg/adaptors/logger/mock_logger/logger.go
@@ -1,4 +1,4 @@
-package mock_logger
+package logger

 import (
 	"fmt"
@@ -8,7 +8,7 @@ import (
 )

 func New(t testingLogger) *Logger {
-	return &Logger{t}
+	return &Logger{t: t}
 }

 type testingLogger interface {
@@ -17,30 +17,38 @@ type testingLogger interface {

 // Logger provides logging facility using testing.T.
 type Logger struct {
-	t testingLogger
+	t        testingLogger
+	maxLevel int
 }

-func (*Logger) AddFlags(f *pflag.FlagSet) {
-	f.IntP("v", "v", 0, "dummy flag used in the tests")
+func (l *Logger) AddFlags(f *pflag.FlagSet) {
+	f.IntVarP(&l.maxLevel, "v", "v", 0, "dummy flag used in the tests")
 }

 func (l *Logger) Printf(format string, args ...interface{}) {
 	l.t.Logf(format, args...)
 }

-type Verbose struct {
+func (l *Logger) V(level int) logger.Verbose {
+	if l.IsEnabled(level) {
+		return &verbose{l.t, level}
+	}
+	return &noopVerbose{}
+}
+
+func (l *Logger) IsEnabled(level int) bool {
+	return level <= l.maxLevel
+}
+
+type verbose struct {
 	t     testingLogger
 	level int
 }

-func (v *Verbose) Infof(format string, args ...interface{}) {
+func (v *verbose) Infof(format string, args ...interface{}) {
 	v.t.Logf(fmt.Sprintf("I%d] ", v.level)+format, args...)
 }

-func (l *Logger) V(level int) logger.Verbose {
-	return &Verbose{l.t, level}
-}
+type noopVerbose struct{}

-func (*Logger) IsEnabled(level int) bool {
-	return true
-}
+func (*noopVerbose) Infof(string, ...interface{}) {}
--- a/pkg/usecases/authentication/authcode_browser.go
+++ b/pkg/usecases/authentication/authcode_browser.go
@@ -4,37 +4,43 @@ import (
 	"context"

 	"github.com/int128/kubelogin/pkg/adaptors/browser"
-	"github.com/int128/kubelogin/pkg/adaptors/env"
 	"github.com/int128/kubelogin/pkg/adaptors/logger"
 	"github.com/int128/kubelogin/pkg/adaptors/oidcclient"
 	"github.com/int128/kubelogin/pkg/domain/oidc"
+	"github.com/int128/kubelogin/pkg/domain/pkce"
+	"github.com/int128/kubelogin/pkg/templates"
 	"golang.org/x/sync/errgroup"
 	"golang.org/x/xerrors"
 )

 // AuthCode provides the authentication code flow.
 type AuthCode struct {
-	Env     env.Interface
 	Browser browser.Interface
 	Logger  logger.Interface
 }

 func (u *AuthCode) Do(ctx context.Context, o *AuthCodeOption, client oidcclient.Interface) (*Output, error) {
-	u.Logger.V(1).Infof("performing the authentication code flow")
+	u.Logger.V(1).Infof("starting the authentication code flow via the browser")
+	state, err := oidc.NewState()
+	if err != nil {
+		return nil, xerrors.Errorf("could not generate a state: %w", err)
+	}
 	nonce, err := oidc.NewNonce()
 	if err != nil {
 		return nil, xerrors.Errorf("could not generate a nonce: %w", err)
 	}
-	p, err := oidc.NewPKCEParams()
+	p, err := pkce.New(client.SupportedPKCEMethods())
 	if err != nil {
 		return nil, xerrors.Errorf("could not generate PKCE parameters: %w", err)
 	}
 	in := oidcclient.GetTokenByAuthCodeInput{
-		BindAddress:         o.BindAddress,
-		Nonce:               nonce,
-		CodeChallenge:       p.CodeChallenge,
-		CodeChallengeMethod: p.CodeChallengeMethod,
-		CodeVerifier:        p.CodeVerifier,
+		BindAddress:            o.BindAddress,
+		State:                  state,
+		Nonce:                  nonce,
+		PKCEParams:             p,
+		RedirectURLHostname:    o.RedirectURLHostname,
+		AuthRequestExtraParams: o.AuthRequestExtraParams,
+		LocalServerSuccessHTML: templates.AuthCodeBrowserSuccessHTML,
 	}
 	readyChan := make(chan string, 1)
 	defer close(readyChan)
@@ -50,6 +56,7 @@ func (u *AuthCode) Do(ctx context.Context, o *AuthCodeOption, client oidcclient.
 				u.Logger.Printf("Please visit the following URL in your browser: %s", url)
 				return nil
 			}
+			u.Logger.V(1).Infof("opening %s in the browser", url)
 			if err := u.Browser.Open(url); err != nil {
 				u.Logger.Printf(`error: could not open the browser: %s

@@ -64,17 +71,19 @@ Please visit the following URL in your browser manually: %s`, err, url)
 	eg.Go(func() error {
 		tokenSet, err := client.GetTokenByAuthCode(ctx, in, readyChan)
 		if err != nil {
-			return xerrors.Errorf("error while the authorization code flow: %w", err)
+			return xerrors.Errorf("authorization code flow error: %w", err)
 		}
 		out = Output{
 			IDToken:       tokenSet.IDToken,
 			IDTokenClaims: tokenSet.IDTokenClaims,
 			RefreshToken:  tokenSet.RefreshToken,
 		}
+		u.Logger.V(1).Infof("got a token set by the authorization code flow")
 		return nil
 	})
 	if err := eg.Wait(); err != nil {
-		return nil, xerrors.Errorf("error while the authorization code flow: %w", err)
+		return nil, xerrors.Errorf("authentication error: %w", err)
 	}
+	u.Logger.V(1).Infof("finished the authorization code flow via the browser")
 	return &out, nil
 }
--- a/pkg/usecases/authentication/authcode_browser_test.go
+++ b/pkg/usecases/authentication/authcode_browser_test.go
@@ -8,17 +8,17 @@ import (
 	"github.com/golang/mock/gomock"
 	"github.com/google/go-cmp/cmp"
 	"github.com/int128/kubelogin/pkg/adaptors/browser/mock_browser"
-	"github.com/int128/kubelogin/pkg/adaptors/logger/mock_logger"
 	"github.com/int128/kubelogin/pkg/adaptors/oidcclient"
 	"github.com/int128/kubelogin/pkg/adaptors/oidcclient/mock_oidcclient"
-	"github.com/int128/kubelogin/pkg/domain/oidc"
+	"github.com/int128/kubelogin/pkg/domain/jwt"
+	"github.com/int128/kubelogin/pkg/testing/logger"
 )

 func TestAuthCode_Do(t *testing.T) {
-	dummyTokenClaims := oidc.Claims{
+	dummyTokenClaims := jwt.Claims{
 		Subject: "YOUR_SUBJECT",
 		Expiry:  time.Date(2019, 1, 2, 3, 4, 5, 0, time.UTC),
-		Pretty:  map[string]string{"sub": "YOUR_SUBJECT"},
+		Pretty:  "PRETTY_JSON",
 	}
 	timeout := 5 * time.Second

@@ -28,13 +28,25 @@ func TestAuthCode_Do(t *testing.T) {
 		ctx, cancel := context.WithTimeout(context.TODO(), timeout)
 		defer cancel()
 		o := &AuthCodeOption{
-			BindAddress:     []string{"127.0.0.1:8000"},
-			SkipOpenBrowser: true,
+			BindAddress:            []string{"127.0.0.1:8000"},
+			SkipOpenBrowser:        true,
+			RedirectURLHostname:    "localhost",
+			AuthRequestExtraParams: map[string]string{"ttl": "86400", "reauth": "true"},
 		}
 		mockOIDCClient := mock_oidcclient.NewMockInterface(ctrl)
+		mockOIDCClient.EXPECT().SupportedPKCEMethods()
 		mockOIDCClient.EXPECT().
 			GetTokenByAuthCode(gomock.Any(), gomock.Any(), gomock.Any()).
-			Do(func(_ context.Context, _ oidcclient.GetTokenByAuthCodeInput, readyChan chan<- string) {
+			Do(func(_ context.Context, in oidcclient.GetTokenByAuthCodeInput, readyChan chan<- string) {
+				if diff := cmp.Diff(o.BindAddress, in.BindAddress); diff != "" {
+					t.Errorf("BindAddress mismatch (-want +got):\n%s", diff)
+				}
+				if diff := cmp.Diff(o.RedirectURLHostname, in.RedirectURLHostname); diff != "" {
+					t.Errorf("RedirectURLHostname mismatch (-want +got):\n%s", diff)
+				}
+				if diff := cmp.Diff(o.AuthRequestExtraParams, in.AuthRequestExtraParams); diff != "" {
+					t.Errorf("AuthRequestExtraParams mismatch (-want +got):\n%s", diff)
+				}
 				readyChan <- "LOCAL_SERVER_URL"
 			}).
 			Return(&oidcclient.TokenSet{
@@ -43,7 +55,7 @@ func TestAuthCode_Do(t *testing.T) {
 				IDTokenClaims: dummyTokenClaims,
 			}, nil)
 		u := AuthCode{
-			Logger: mock_logger.New(t),
+			Logger: logger.New(t),
 		}
 		got, err := u.Do(ctx, o, mockOIDCClient)
 		if err != nil {
@@ -68,6 +80,7 @@ func TestAuthCode_Do(t *testing.T) {
 			BindAddress: []string{"127.0.0.1:8000"},
 		}
 		mockOIDCClient := mock_oidcclient.NewMockInterface(ctrl)
+		mockOIDCClient.EXPECT().SupportedPKCEMethods()
 		mockOIDCClient.EXPECT().
 			GetTokenByAuthCode(gomock.Any(), gomock.Any(), gomock.Any()).
 			Do(func(_ context.Context, _ oidcclient.GetTokenByAuthCodeInput, readyChan chan<- string) {
@@ -82,7 +95,7 @@ func TestAuthCode_Do(t *testing.T) {
 		mockBrowser.EXPECT().
 			Open("LOCAL_SERVER_URL")
 		u := AuthCode{
-			Logger:  mock_logger.New(t),
+			Logger:  logger.New(t),
 			Browser: mockBrowser,
 		}
 		got, err := u.Do(ctx, o, mockOIDCClient)
--- a/pkg/usecases/authentication/authcode_keyboard.go
+++ b/pkg/usecases/authentication/authcode_keyboard.go
@@ -3,10 +3,11 @@ package authentication
 import (
 	"context"

-	"github.com/int128/kubelogin/pkg/adaptors/env"
 	"github.com/int128/kubelogin/pkg/adaptors/logger"
 	"github.com/int128/kubelogin/pkg/adaptors/oidcclient"
+	"github.com/int128/kubelogin/pkg/adaptors/reader"
 	"github.com/int128/kubelogin/pkg/domain/oidc"
+	"github.com/int128/kubelogin/pkg/domain/pkce"
 	"golang.org/x/xerrors"
 )

@@ -15,12 +16,12 @@ const oobRedirectURI = "urn:ietf:wg:oauth:2.0:oob"

 // AuthCodeKeyboard provides the authorization code flow with keyboard interactive.
 type AuthCodeKeyboard struct {
-	Env    env.Interface
+	Reader reader.Interface
 	Logger logger.Interface
 }

 func (u *AuthCodeKeyboard) Do(ctx context.Context, o *AuthCodeKeyboardOption, client oidcclient.Interface) (*Output, error) {
-	u.Logger.V(1).Infof("performing the authorization code flow with keyboard interactive")
+	u.Logger.V(1).Infof("starting the authorization code flow with keyboard interactive")
 	state, err := oidc.NewState()
 	if err != nil {
 		return nil, xerrors.Errorf("could not generate a state: %w", err)
@@ -29,32 +30,34 @@ func (u *AuthCodeKeyboard) Do(ctx context.Context, o *AuthCodeKeyboardOption, cl
 	if err != nil {
 		return nil, xerrors.Errorf("could not generate a nonce: %w", err)
 	}
-	p, err := oidc.NewPKCEParams()
+	p, err := pkce.New(client.SupportedPKCEMethods())
 	if err != nil {
 		return nil, xerrors.Errorf("could not generate PKCE parameters: %w", err)
 	}
 	authCodeURL := client.GetAuthCodeURL(oidcclient.AuthCodeURLInput{
-		State:               state,
-		Nonce:               nonce,
-		CodeChallenge:       p.CodeChallenge,
-		CodeChallengeMethod: p.CodeChallengeMethod,
-		RedirectURI:         oobRedirectURI,
+		State:                  state,
+		Nonce:                  nonce,
+		PKCEParams:             p,
+		RedirectURI:            oobRedirectURI,
+		AuthRequestExtraParams: o.AuthRequestExtraParams,
 	})
-	u.Logger.Printf("Open %s", authCodeURL)
-	code, err := u.Env.ReadString(authCodeKeyboardPrompt)
+	u.Logger.Printf("Please visit the following URL in your browser: %s", authCodeURL)
+	code, err := u.Reader.ReadString(authCodeKeyboardPrompt)
 	if err != nil {
-		return nil, xerrors.Errorf("could not read the authorization code: %w", err)
+		return nil, xerrors.Errorf("could not read an authorization code: %w", err)
 	}

+	u.Logger.V(1).Infof("exchanging the code and token")
 	tokenSet, err := client.ExchangeAuthCode(ctx, oidcclient.ExchangeAuthCodeInput{
-		Code:         code,
-		CodeVerifier: p.CodeVerifier,
-		Nonce:        nonce,
-		RedirectURI:  oobRedirectURI,
+		Code:        code,
+		PKCEParams:  p,
+		Nonce:       nonce,
+		RedirectURI: oobRedirectURI,
 	})
 	if err != nil {
-		return nil, xerrors.Errorf("could not get the token: %w", err)
+		return nil, xerrors.Errorf("could not exchange the authorization code: %w", err)
 	}
+	u.Logger.V(1).Infof("finished the authorization code flow with keyboard interactive")
 	return &Output{
 		IDToken:       tokenSet.IDToken,
 		IDTokenClaims: tokenSet.IDTokenClaims,
--- a/pkg/usecases/authentication/authcode_keyboard_test.go
+++ b/pkg/usecases/authentication/authcode_keyboard_test.go
@@ -7,20 +7,20 @@ import (

 	"github.com/golang/mock/gomock"
 	"github.com/google/go-cmp/cmp"
-	"github.com/int128/kubelogin/pkg/adaptors/env/mock_env"
-	"github.com/int128/kubelogin/pkg/adaptors/logger/mock_logger"
 	"github.com/int128/kubelogin/pkg/adaptors/oidcclient"
 	"github.com/int128/kubelogin/pkg/adaptors/oidcclient/mock_oidcclient"
-	"github.com/int128/kubelogin/pkg/domain/oidc"
+	"github.com/int128/kubelogin/pkg/adaptors/reader/mock_reader"
+	"github.com/int128/kubelogin/pkg/domain/jwt"
+	"github.com/int128/kubelogin/pkg/testing/logger"
 )

 var nonNil = gomock.Not(gomock.Nil())

 func TestAuthCodeKeyboard_Do(t *testing.T) {
-	dummyTokenClaims := oidc.Claims{
+	dummyTokenClaims := jwt.Claims{
 		Subject: "YOUR_SUBJECT",
 		Expiry:  time.Date(2019, 1, 2, 3, 4, 5, 0, time.UTC),
-		Pretty:  map[string]string{"sub": "YOUR_SUBJECT"},
+		Pretty:  "PRETTY_JSON",
 	}
 	timeout := 5 * time.Second

@@ -29,9 +29,18 @@ func TestAuthCodeKeyboard_Do(t *testing.T) {
 		defer ctrl.Finish()
 		ctx, cancel := context.WithTimeout(context.TODO(), timeout)
 		defer cancel()
+		o := &AuthCodeKeyboardOption{
+			AuthRequestExtraParams: map[string]string{"ttl": "86400", "reauth": "true"},
+		}
 		mockOIDCClient := mock_oidcclient.NewMockInterface(ctrl)
+		mockOIDCClient.EXPECT().SupportedPKCEMethods()
 		mockOIDCClient.EXPECT().
 			GetAuthCodeURL(nonNil).
+			Do(func(in oidcclient.AuthCodeURLInput) {
+				if diff := cmp.Diff(o.AuthRequestExtraParams, in.AuthRequestExtraParams); diff != "" {
+					t.Errorf("AuthRequestExtraParams mismatch (-want +got):\n%s", diff)
+				}
+			}).
 			Return("https://issuer.example.com/auth")
 		mockOIDCClient.EXPECT().
 			ExchangeAuthCode(nonNil, nonNil).
@@ -45,15 +54,15 @@ func TestAuthCodeKeyboard_Do(t *testing.T) {
 				IDTokenClaims: dummyTokenClaims,
 				RefreshToken:  "YOUR_REFRESH_TOKEN",
 			}, nil)
-		mockEnv := mock_env.NewMockInterface(ctrl)
-		mockEnv.EXPECT().
+		mockReader := mock_reader.NewMockInterface(ctrl)
+		mockReader.EXPECT().
 			ReadString(authCodeKeyboardPrompt).
 			Return("YOUR_AUTH_CODE", nil)
 		u := AuthCodeKeyboard{
-			Env:    mockEnv,
-			Logger: mock_logger.New(t),
+			Reader: mockReader,
+			Logger: logger.New(t),
 		}
-		got, err := u.Do(ctx, nil, mockOIDCClient)
+		got, err := u.Do(ctx, o, mockOIDCClient)
 		if err != nil {
 			t.Errorf("Do returned error: %+v", err)
 		}
--- a/pkg/usecases/authentication/authentication.go
+++ b/pkg/usecases/authentication/authentication.go
@@ -5,11 +5,10 @@ import (

 	"github.com/google/wire"
 	"github.com/int128/kubelogin/pkg/adaptors/certpool"
-	"github.com/int128/kubelogin/pkg/adaptors/env"
-	"github.com/int128/kubelogin/pkg/adaptors/jwtdecoder"
+	"github.com/int128/kubelogin/pkg/adaptors/clock"
 	"github.com/int128/kubelogin/pkg/adaptors/logger"
 	"github.com/int128/kubelogin/pkg/adaptors/oidcclient"
-	"github.com/int128/kubelogin/pkg/domain/oidc"
+	"github.com/int128/kubelogin/pkg/domain/jwt"
 	"golang.org/x/xerrors"
 )

@@ -36,8 +35,8 @@ type Input struct {
 	ExtraScopes    []string // optional
 	CertPool       certpool.Interface
 	SkipTLSVerify  bool
-	IDToken        string // optional
-	RefreshToken   string // optional
+	IDToken        string // optional, from the token cache
+	RefreshToken   string // optional, from the token cache
 	GrantOptionSet GrantOptionSet
 }

@@ -48,22 +47,26 @@ type GrantOptionSet struct {
 }

 type AuthCodeOption struct {
-	SkipOpenBrowser bool
-	BindAddress     []string
+	SkipOpenBrowser        bool
+	BindAddress            []string
+	RedirectURLHostname    string
+	AuthRequestExtraParams map[string]string
 }

-type AuthCodeKeyboardOption struct{}
+type AuthCodeKeyboardOption struct {
+	AuthRequestExtraParams map[string]string
+}

 type ROPCOption struct {
 	Username string
-	Password string // If empty, read a password using Env.ReadPassword()
+	Password string // If empty, read a password using Reader.ReadPassword()
 }

 // Output represents an output DTO of the Authentication use-case.
 type Output struct {
 	AlreadyHasValidIDToken bool
 	IDToken                string
-	IDTokenClaims          oidc.Claims
+	IDTokenClaims          jwt.Claims
 	RefreshToken           string
 }

@@ -84,10 +87,9 @@ const passwordPrompt = "Password: "
 // If the Password is not set, it asks a password by the prompt.
 //
 type Authentication struct {
-	NewOIDCClient    oidcclient.NewFunc
-	JWTDecoder       jwtdecoder.Interface
+	OIDCClient       oidcclient.FactoryInterface
 	Logger           logger.Interface
-	Env              env.Interface
+	Clock            clock.Interface
 	AuthCode         *AuthCode
 	AuthCodeKeyboard *AuthCodeKeyboard
 	ROPC             *ROPC
@@ -99,11 +101,11 @@ func (u *Authentication) Do(ctx context.Context, in Input) (*Output, error) {
 		// Skip verification of the token to reduce time of a discovery request.
 		// Here it trusts the signature and claims and checks only expiration,
 		// because the token has been verified before caching.
-		claims, err := u.JWTDecoder.Decode(in.IDToken)
+		claims, err := jwt.DecodeWithoutVerify(in.IDToken)
 		if err != nil {
-			return nil, xerrors.Errorf("invalid token and you need to remove the cache: %w", err)
+			return nil, xerrors.Errorf("invalid token cache (you may need to remove): %w", err)
 		}
-		if !claims.IsExpired(u.Env) {
+		if !claims.IsExpired(u.Clock) {
 			u.Logger.V(1).Infof("you already have a valid token until %s", claims.Expiry)
 			return &Output{
 				AlreadyHasValidIDToken: true,
@@ -116,17 +118,16 @@ func (u *Authentication) Do(ctx context.Context, in Input) (*Output, error) {
 	}

 	u.Logger.V(1).Infof("initializing an OpenID Connect client")
-	client, err := u.NewOIDCClient(ctx, oidcclient.Config{
+	client, err := u.OIDCClient.New(ctx, oidcclient.Config{
 		IssuerURL:     in.IssuerURL,
 		ClientID:      in.ClientID,
 		ClientSecret:  in.ClientSecret,
 		ExtraScopes:   in.ExtraScopes,
 		CertPool:      in.CertPool,
 		SkipTLSVerify: in.SkipTLSVerify,
-		Logger:        u.Logger,
 	})
 	if err != nil {
-		return nil, xerrors.Errorf("could not initialize the OpenID Connect client: %w", err)
+		return nil, xerrors.Errorf("oidc error: %w", err)
 	}

 	if in.RefreshToken != "" {
--- a/pkg/usecases/authentication/authentication_test.go
+++ b/pkg/usecases/authentication/authentication_test.go
@@ -7,29 +7,28 @@ import (

 	"github.com/golang/mock/gomock"
 	"github.com/google/go-cmp/cmp"
-	"github.com/google/go-cmp/cmp/cmpopts"
-	"github.com/int128/kubelogin/pkg/adaptors/env/mock_env"
-	"github.com/int128/kubelogin/pkg/adaptors/jwtdecoder/mock_jwtdecoder"
-	"github.com/int128/kubelogin/pkg/adaptors/logger"
-	"github.com/int128/kubelogin/pkg/adaptors/logger/mock_logger"
 	"github.com/int128/kubelogin/pkg/adaptors/oidcclient"
 	"github.com/int128/kubelogin/pkg/adaptors/oidcclient/mock_oidcclient"
-	"github.com/int128/kubelogin/pkg/domain/oidc"
+	"github.com/int128/kubelogin/pkg/domain/jwt"
+	"github.com/int128/kubelogin/pkg/testing/clock"
+	testingJWT "github.com/int128/kubelogin/pkg/testing/jwt"
+	testingLogger "github.com/int128/kubelogin/pkg/testing/logger"
 	"golang.org/x/xerrors"
 )

-var cmpIgnoreLogger = cmpopts.IgnoreInterfaces(struct{ logger.Interface }{})
-
 func TestAuthentication_Do(t *testing.T) {
-	dummyTokenClaims := oidc.Claims{
-		Subject: "YOUR_SUBJECT",
-		Expiry:  time.Date(2019, 1, 2, 3, 4, 5, 0, time.UTC),
-		Pretty:  map[string]string{"sub": "YOUR_SUBJECT"},
-	}
-	timeBeforeExpiry := time.Date(2019, 1, 2, 1, 0, 0, 0, time.UTC)
-	timeAfterExpiry := time.Date(2019, 1, 2, 4, 0, 0, 0, time.UTC)
 	timeout := 5 * time.Second
-	testingLogger := mock_logger.New(t)
+	expiryTime := time.Date(2020, 1, 2, 3, 4, 5, 0, time.UTC)
+	cachedIDToken := testingJWT.EncodeF(t, func(claims *testingJWT.Claims) {
+		claims.Issuer = "https://issuer.example.com"
+		claims.Subject = "SUBJECT"
+		claims.ExpiresAt = expiryTime.Unix()
+	})
+	dummyClaims := jwt.Claims{
+		Subject: "SUBJECT",
+		Expiry:  time.Date(2020, 1, 1, 0, 0, 0, 0, time.UTC),
+		Pretty:  "PRETTY_JSON",
+	}

 	t.Run("HasValidIDToken", func(t *testing.T) {
 		ctrl := gomock.NewController(t)
@@ -40,20 +39,11 @@ func TestAuthentication_Do(t *testing.T) {
 			IssuerURL:    "https://issuer.example.com",
 			ClientID:     "YOUR_CLIENT_ID",
 			ClientSecret: "YOUR_CLIENT_SECRET",
-			IDToken:      "VALID_ID_TOKEN",
+			IDToken:      cachedIDToken,
 		}
-		mockEnv := mock_env.NewMockInterface(ctrl)
-		mockEnv.EXPECT().
-			Now().
-			Return(timeBeforeExpiry)
-		mockDecoder := mock_jwtdecoder.NewMockInterface(ctrl)
-		mockDecoder.EXPECT().
-			Decode("VALID_ID_TOKEN").
-			Return(&dummyTokenClaims, nil)
 		u := Authentication{
-			JWTDecoder: mockDecoder,
-			Logger:     testingLogger,
-			Env:        mockEnv,
+			Logger: testingLogger.New(t),
+			Clock:  clock.Fake(expiryTime.Add(-time.Hour)),
 		}
 		got, err := u.Do(ctx, in)
 		if err != nil {
@@ -61,8 +51,16 @@ func TestAuthentication_Do(t *testing.T) {
 		}
 		want := &Output{
 			AlreadyHasValidIDToken: true,
-			IDToken:                "VALID_ID_TOKEN",
-			IDTokenClaims:          dummyTokenClaims,
+			IDToken:                cachedIDToken,
+			IDTokenClaims: jwt.Claims{
+				Subject: "SUBJECT",
+				Expiry:  expiryTime,
+				Pretty: `{
+  "exp": 1577934245,
+  "iss": "https://issuer.example.com",
+  "sub": "SUBJECT"
+}`,
+			},
 		}
 		if diff := cmp.Diff(want, got); diff != "" {
 			t.Errorf("mismatch (-want +got):\n%s", diff)
@@ -78,40 +76,29 @@ func TestAuthentication_Do(t *testing.T) {
 			IssuerURL:    "https://issuer.example.com",
 			ClientID:     "YOUR_CLIENT_ID",
 			ClientSecret: "YOUR_CLIENT_SECRET",
-			IDToken:      "EXPIRED_ID_TOKEN",
+			IDToken:      cachedIDToken,
 			RefreshToken: "VALID_REFRESH_TOKEN",
 		}
-		mockEnv := mock_env.NewMockInterface(ctrl)
-		mockEnv.EXPECT().
-			Now().
-			Return(timeAfterExpiry)
-		mockDecoder := mock_jwtdecoder.NewMockInterface(ctrl)
-		mockDecoder.EXPECT().
-			Decode("EXPIRED_ID_TOKEN").
-			Return(&dummyTokenClaims, nil)
 		mockOIDCClient := mock_oidcclient.NewMockInterface(ctrl)
 		mockOIDCClient.EXPECT().
 			Refresh(ctx, "VALID_REFRESH_TOKEN").
 			Return(&oidcclient.TokenSet{
 				IDToken:       "NEW_ID_TOKEN",
 				RefreshToken:  "NEW_REFRESH_TOKEN",
-				IDTokenClaims: dummyTokenClaims,
+				IDTokenClaims: dummyClaims,
 			}, nil)
 		u := Authentication{
-			NewOIDCClient: func(_ context.Context, got oidcclient.Config) (oidcclient.Interface, error) {
-				want := oidcclient.Config{
+			OIDCClient: &oidcclientFactory{
+				t:      t,
+				client: mockOIDCClient,
+				want: oidcclient.Config{
 					IssuerURL:    "https://issuer.example.com",
 					ClientID:     "YOUR_CLIENT_ID",
 					ClientSecret: "YOUR_CLIENT_SECRET",
-				}
-				if diff := cmp.Diff(want, got, cmpIgnoreLogger); diff != "" {
-					t.Errorf("mismatch (-want +got):\n%s", diff)
-				}
-				return mockOIDCClient, nil
+				},
 			},
-			JWTDecoder: mockDecoder,
-			Logger:     testingLogger,
-			Env:        mockEnv,
+			Logger: testingLogger.New(t),
+			Clock:  clock.Fake(expiryTime.Add(+time.Hour)),
 		}
 		got, err := u.Do(ctx, in)
 		if err != nil {
@@ -120,7 +107,7 @@ func TestAuthentication_Do(t *testing.T) {
 		want := &Output{
 			IDToken:       "NEW_ID_TOKEN",
 			RefreshToken:  "NEW_REFRESH_TOKEN",
-			IDTokenClaims: dummyTokenClaims,
+			IDTokenClaims: dummyClaims,
 		}
 		if diff := cmp.Diff(want, got); diff != "" {
 			t.Errorf("mismatch (-want +got):\n%s", diff)
@@ -142,18 +129,11 @@ func TestAuthentication_Do(t *testing.T) {
 			IssuerURL:    "https://issuer.example.com",
 			ClientID:     "YOUR_CLIENT_ID",
 			ClientSecret: "YOUR_CLIENT_SECRET",
-			IDToken:      "EXPIRED_ID_TOKEN",
+			IDToken:      cachedIDToken,
 			RefreshToken: "EXPIRED_REFRESH_TOKEN",
 		}
-		mockEnv := mock_env.NewMockInterface(ctrl)
-		mockEnv.EXPECT().
-			Now().
-			Return(timeAfterExpiry)
-		mockDecoder := mock_jwtdecoder.NewMockInterface(ctrl)
-		mockDecoder.EXPECT().
-			Decode("EXPIRED_ID_TOKEN").
-			Return(&dummyTokenClaims, nil)
 		mockOIDCClient := mock_oidcclient.NewMockInterface(ctrl)
+		mockOIDCClient.EXPECT().SupportedPKCEMethods()
 		mockOIDCClient.EXPECT().
 			Refresh(ctx, "EXPIRED_REFRESH_TOKEN").
 			Return(nil, xerrors.New("token has expired"))
@@ -165,25 +145,22 @@ func TestAuthentication_Do(t *testing.T) {
 			Return(&oidcclient.TokenSet{
 				IDToken:       "NEW_ID_TOKEN",
 				RefreshToken:  "NEW_REFRESH_TOKEN",
-				IDTokenClaims: dummyTokenClaims,
+				IDTokenClaims: dummyClaims,
 			}, nil)
 		u := Authentication{
-			NewOIDCClient: func(_ context.Context, got oidcclient.Config) (oidcclient.Interface, error) {
-				want := oidcclient.Config{
+			OIDCClient: &oidcclientFactory{
+				t:      t,
+				client: mockOIDCClient,
+				want: oidcclient.Config{
 					IssuerURL:    "https://issuer.example.com",
 					ClientID:     "YOUR_CLIENT_ID",
 					ClientSecret: "YOUR_CLIENT_SECRET",
-				}
-				if diff := cmp.Diff(want, got, cmpIgnoreLogger); diff != "" {
-					t.Errorf("mismatch (-want +got):\n%s", diff)
-				}
-				return mockOIDCClient, nil
+				},
 			},
-			JWTDecoder: mockDecoder,
-			Logger:     testingLogger,
-			Env:        mockEnv,
+			Logger: testingLogger.New(t),
+			Clock:  clock.Fake(expiryTime.Add(+time.Hour)),
 			AuthCode: &AuthCode{
-				Logger: testingLogger,
+				Logger: testingLogger.New(t),
 			},
 		}
 		got, err := u.Do(ctx, in)
@@ -193,7 +170,7 @@ func TestAuthentication_Do(t *testing.T) {
 		want := &Output{
 			IDToken:       "NEW_ID_TOKEN",
 			RefreshToken:  "NEW_REFRESH_TOKEN",
-			IDTokenClaims: dummyTokenClaims,
+			IDTokenClaims: dummyClaims,
 		}
 		if diff := cmp.Diff(want, got); diff != "" {
 			t.Errorf("mismatch (-want +got):\n%s", diff)
@@ -222,23 +199,21 @@ func TestAuthentication_Do(t *testing.T) {
 			Return(&oidcclient.TokenSet{
 				IDToken:       "YOUR_ID_TOKEN",
 				RefreshToken:  "YOUR_REFRESH_TOKEN",
-				IDTokenClaims: dummyTokenClaims,
+				IDTokenClaims: dummyClaims,
 			}, nil)
 		u := Authentication{
-			NewOIDCClient: func(_ context.Context, got oidcclient.Config) (oidcclient.Interface, error) {
-				want := oidcclient.Config{
+			OIDCClient: &oidcclientFactory{
+				t:      t,
+				client: mockOIDCClient,
+				want: oidcclient.Config{
 					IssuerURL:    "https://issuer.example.com",
 					ClientID:     "YOUR_CLIENT_ID",
 					ClientSecret: "YOUR_CLIENT_SECRET",
-				}
-				if diff := cmp.Diff(want, got, cmpIgnoreLogger); diff != "" {
-					t.Errorf("mismatch (-want +got):\n%s", diff)
-				}
-				return mockOIDCClient, nil
+				},
 			},
-			Logger: testingLogger,
+			Logger: testingLogger.New(t),
 			ROPC: &ROPC{
-				Logger: testingLogger,
+				Logger: testingLogger.New(t),
 			},
 		}
 		got, err := u.Do(ctx, in)
@@ -248,10 +223,23 @@ func TestAuthentication_Do(t *testing.T) {
 		want := &Output{
 			IDToken:       "YOUR_ID_TOKEN",
 			RefreshToken:  "YOUR_REFRESH_TOKEN",
-			IDTokenClaims: dummyTokenClaims,
+			IDTokenClaims: dummyClaims,
 		}
 		if diff := cmp.Diff(want, got); diff != "" {
 			t.Errorf("mismatch (-want +got):\n%s", diff)
 		}
 	})
 }
+
+type oidcclientFactory struct {
+	t      *testing.T
+	client oidcclient.Interface
+	want   oidcclient.Config
+}
+
+func (f *oidcclientFactory) New(_ context.Context, got oidcclient.Config) (oidcclient.Interface, error) {
+	if diff := cmp.Diff(f.want, got); diff != "" {
+		f.t.Errorf("mismatch (-want +got):\n%s", diff)
+	}
+	return f.client, nil
+}
--- a/pkg/usecases/authentication/password.go
+++ b/pkg/usecases/authentication/password.go
@@ -3,38 +3,39 @@ package authentication
 import (
 	"context"

-	"github.com/int128/kubelogin/pkg/adaptors/env"
 	"github.com/int128/kubelogin/pkg/adaptors/logger"
 	"github.com/int128/kubelogin/pkg/adaptors/oidcclient"
+	"github.com/int128/kubelogin/pkg/adaptors/reader"
 	"golang.org/x/xerrors"
 )

 // ROPC provides the resource owner password credentials flow.
 type ROPC struct {
-	Env    env.Interface
+	Reader reader.Interface
 	Logger logger.Interface
 }

 func (u *ROPC) Do(ctx context.Context, in *ROPCOption, client oidcclient.Interface) (*Output, error) {
-	u.Logger.V(1).Infof("performing the resource owner password credentials flow")
+	u.Logger.V(1).Infof("starting the resource owner password credentials flow")
 	if in.Username == "" {
 		var err error
-		in.Username, err = u.Env.ReadString(usernamePrompt)
+		in.Username, err = u.Reader.ReadString(usernamePrompt)
 		if err != nil {
-			return nil, xerrors.Errorf("could not get the username: %w", err)
+			return nil, xerrors.Errorf("could not read a username: %w", err)
 		}
 	}
 	if in.Password == "" {
 		var err error
-		in.Password, err = u.Env.ReadPassword(passwordPrompt)
+		in.Password, err = u.Reader.ReadPassword(passwordPrompt)
 		if err != nil {
 			return nil, xerrors.Errorf("could not read a password: %w", err)
 		}
 	}
 	tokenSet, err := client.GetTokenByROPC(ctx, in.Username, in.Password)
 	if err != nil {
-		return nil, xerrors.Errorf("error while the resource owner password credentials flow: %w", err)
+		return nil, xerrors.Errorf("resource owner password credentials flow error: %w", err)
 	}
+	u.Logger.V(1).Infof("finished the resource owner password credentials flow")
 	return &Output{
 		IDToken:       tokenSet.IDToken,
 		IDTokenClaims: tokenSet.IDTokenClaims,
--- a/pkg/usecases/authentication/password_test.go
+++ b/pkg/usecases/authentication/password_test.go
@@ -7,19 +7,19 @@ import (

 	"github.com/golang/mock/gomock"
 	"github.com/google/go-cmp/cmp"
-	"github.com/int128/kubelogin/pkg/adaptors/env/mock_env"
-	"github.com/int128/kubelogin/pkg/adaptors/logger/mock_logger"
 	"github.com/int128/kubelogin/pkg/adaptors/oidcclient"
 	"github.com/int128/kubelogin/pkg/adaptors/oidcclient/mock_oidcclient"
-	"github.com/int128/kubelogin/pkg/domain/oidc"
+	"github.com/int128/kubelogin/pkg/adaptors/reader/mock_reader"
+	"github.com/int128/kubelogin/pkg/domain/jwt"
+	"github.com/int128/kubelogin/pkg/testing/logger"
 	"golang.org/x/xerrors"
 )

 func TestROPC_Do(t *testing.T) {
-	dummyTokenClaims := oidc.Claims{
+	dummyTokenClaims := jwt.Claims{
 		Subject: "YOUR_SUBJECT",
 		Expiry:  time.Date(2019, 1, 2, 3, 4, 5, 0, time.UTC),
-		Pretty:  map[string]string{"sub": "YOUR_SUBJECT"},
+		Pretty:  "PRETTY_JSON",
 	}
 	timeout := 5 * time.Second

@@ -37,12 +37,12 @@ func TestROPC_Do(t *testing.T) {
 				IDTokenClaims: dummyTokenClaims,
 				RefreshToken:  "YOUR_REFRESH_TOKEN",
 			}, nil)
-		mockEnv := mock_env.NewMockInterface(ctrl)
-		mockEnv.EXPECT().ReadString(usernamePrompt).Return("USER", nil)
-		mockEnv.EXPECT().ReadPassword(passwordPrompt).Return("PASS", nil)
+		mockReader := mock_reader.NewMockInterface(ctrl)
+		mockReader.EXPECT().ReadString(usernamePrompt).Return("USER", nil)
+		mockReader.EXPECT().ReadPassword(passwordPrompt).Return("PASS", nil)
 		u := ROPC{
-			Env:    mockEnv,
-			Logger: mock_logger.New(t),
+			Reader: mockReader,
+			Logger: logger.New(t),
 		}
 		got, err := u.Do(ctx, o, mockOIDCClient)
 		if err != nil {
@@ -76,7 +76,7 @@ func TestROPC_Do(t *testing.T) {
 				IDTokenClaims: dummyTokenClaims,
 			}, nil)
 		u := ROPC{
-			Logger: mock_logger.New(t),
+			Logger: logger.New(t),
 		}
 		got, err := u.Do(ctx, o, mockOIDCClient)
 		if err != nil {
@@ -108,11 +108,11 @@ func TestROPC_Do(t *testing.T) {
 				RefreshToken:  "YOUR_REFRESH_TOKEN",
 				IDTokenClaims: dummyTokenClaims,
 			}, nil)
-		mockEnv := mock_env.NewMockInterface(ctrl)
+		mockEnv := mock_reader.NewMockInterface(ctrl)
 		mockEnv.EXPECT().ReadPassword(passwordPrompt).Return("PASS", nil)
 		u := ROPC{
-			Env:    mockEnv,
-			Logger: mock_logger.New(t),
+			Reader: mockEnv,
+			Logger: logger.New(t),
 		}
 		got, err := u.Do(ctx, o, mockOIDCClient)
 		if err != nil {
@@ -136,11 +136,11 @@ func TestROPC_Do(t *testing.T) {
 		o := &ROPCOption{
 			Username: "USER",
 		}
-		mockEnv := mock_env.NewMockInterface(ctrl)
+		mockEnv := mock_reader.NewMockInterface(ctrl)
 		mockEnv.EXPECT().ReadPassword(passwordPrompt).Return("", xerrors.New("error"))
 		u := ROPC{
-			Env:    mockEnv,
-			Logger: mock_logger.New(t),
+			Reader: mockEnv,
+			Logger: logger.New(t),
 		}
 		out, err := u.Do(ctx, o, mock_oidcclient.NewMockInterface(ctrl))
 		if err == nil {
--- a/pkg/usecases/credentialplugin/get_token.go
+++ b/pkg/usecases/credentialplugin/get_token.go
@@ -51,7 +51,7 @@ func (u *GetToken) Do(ctx context.Context, in Input) error {
 	u.Logger.V(1).Infof("WARNING: log may contain your secrets such as token or password")
 	out, err := u.getTokenFromCacheOrProvider(ctx, in)
 	if err != nil {
-		return xerrors.Errorf("could not get a token from the cache or provider: %w", err)
+		return xerrors.Errorf("could not get a token: %w", err)
 	}
 	u.Logger.V(1).Infof("writing the token to client-go")
 	if err := u.Writer.Write(credentialpluginwriter.Output{Token: out.IDToken, Expiry: out.IDTokenClaims.Expiry}); err != nil {
@@ -99,11 +99,9 @@ func (u *GetToken) getTokenFromCacheOrProvider(ctx context.Context, in Input) (*
 		GrantOptionSet: in.GrantOptionSet,
 	})
 	if err != nil {
-		return nil, xerrors.Errorf("error while authentication: %w", err)
-	}
-	for k, v := range out.IDTokenClaims.Pretty {
-		u.Logger.V(1).Infof("the ID token has the claim: %s=%v", k, v)
+		return nil, xerrors.Errorf("authentication error: %w", err)
 	}
+	u.Logger.V(1).Infof("you got a token: %s", out.IDTokenClaims.Pretty)
 	if out.AlreadyHasValidIDToken {
 		u.Logger.V(1).Infof("you already have a valid token until %s", out.IDTokenClaims.Expiry)
 		return out, nil
--- a/pkg/usecases/credentialplugin/get_token_test.go
+++ b/pkg/usecases/credentialplugin/get_token_test.go
@@ -10,20 +10,20 @@ import (
 	"github.com/int128/kubelogin/pkg/adaptors/certpool/mock_certpool"
 	"github.com/int128/kubelogin/pkg/adaptors/credentialpluginwriter"
 	"github.com/int128/kubelogin/pkg/adaptors/credentialpluginwriter/mock_credentialpluginwriter"
-	"github.com/int128/kubelogin/pkg/adaptors/logger/mock_logger"
 	"github.com/int128/kubelogin/pkg/adaptors/tokencache"
 	"github.com/int128/kubelogin/pkg/adaptors/tokencache/mock_tokencache"
-	"github.com/int128/kubelogin/pkg/domain/oidc"
+	"github.com/int128/kubelogin/pkg/domain/jwt"
+	"github.com/int128/kubelogin/pkg/testing/logger"
 	"github.com/int128/kubelogin/pkg/usecases/authentication"
 	"github.com/int128/kubelogin/pkg/usecases/authentication/mock_authentication"
 	"golang.org/x/xerrors"
 )

 func TestGetToken_Do(t *testing.T) {
-	dummyTokenClaims := oidc.Claims{
+	dummyTokenClaims := jwt.Claims{
 		Subject: "YOUR_SUBJECT",
 		Expiry:  time.Date(2019, 1, 2, 3, 4, 5, 0, time.UTC),
-		Pretty:  map[string]string{"sub": "YOUR_SUBJECT"},
+		Pretty:  "PRETTY_JSON",
 	}

 	t.Run("FullOptions", func(t *testing.T) {
@@ -98,7 +98,7 @@ func TestGetToken_Do(t *testing.T) {
 			TokenCacheRepository: tokenCacheRepository,
 			NewCertPool:          func() certpool.Interface { return mockCertPool },
 			Writer:               credentialPluginWriter,
-			Logger:               mock_logger.New(t),
+			Logger:               logger.New(t),
 		}
 		if err := u.Do(ctx, in); err != nil {
 			t.Errorf("Do returned error: %+v", err)
@@ -151,7 +151,7 @@ func TestGetToken_Do(t *testing.T) {
 			TokenCacheRepository: tokenCacheRepository,
 			NewCertPool:          func() certpool.Interface { return mockCertPool },
 			Writer:               credentialPluginWriter,
-			Logger:               mock_logger.New(t),
+			Logger:               logger.New(t),
 		}
 		if err := u.Do(ctx, in); err != nil {
 			t.Errorf("Do returned error: %+v", err)
@@ -191,7 +191,7 @@ func TestGetToken_Do(t *testing.T) {
 			TokenCacheRepository: tokenCacheRepository,
 			NewCertPool:          func() certpool.Interface { return mockCertPool },
 			Writer:               mock_credentialpluginwriter.NewMockInterface(ctrl),
-			Logger:               mock_logger.New(t),
+			Logger:               logger.New(t),
 		}
 		if err := u.Do(ctx, in); err == nil {
 			t.Errorf("err wants non-nil but nil")
--- a/pkg/usecases/setup/stage2.go
+++ b/pkg/usecases/setup/stage2.go
@@ -14,25 +14,13 @@ var stage2Tpl = template.Must(template.New("").Parse(`

 You got a token with the following claims:

-{{- range $k, $v := .Claims }}
-	{{ $k }}={{ $v }}
-{{- end }}
+{{ .IDTokenPrettyJSON }}

 ## 3. Bind a cluster role

-Apply the following manifest:
+Run the following command:

-	kind: ClusterRoleBinding
-	apiVersion: rbac.authorization.k8s.io/v1
-	metadata:
-	  name: oidc-cluster-admin
-	roleRef:
-	  apiGroup: rbac.authorization.k8s.io
-	  kind: ClusterRole
-	  name: cluster-admin
-	subjects:
-	- kind: User
-	  name: {{ .IssuerURL }}#{{ .Subject }}
+	kubectl create clusterrolebinding oidc-cluster-admin --clusterrole=cluster-admin --user='{{ .IssuerURL }}#{{ .Subject }}'

 ## 4. Set up the Kubernetes API server

@@ -51,7 +39,7 @@ Run the following command:
 	  --exec-arg=oidc-login \
 	  --exec-arg=get-token \
 {{- range .Args }}
-	  --exec-arg={{ . }}
+	  --exec-arg={{ . }} \
 {{- end }}

 ## 6. Verify cluster access
@@ -68,11 +56,11 @@ You can share the kubeconfig to your team members for on-boarding.
 `))

 type stage2Vars struct {
-	Claims    map[string]string
-	IssuerURL string
-	ClientID  string
-	Args      []string
-	Subject   string
+	IDTokenPrettyJSON string
+	IssuerURL         string
+	ClientID          string
+	Args              []string
+	Subject           string
 }

 // Stage2Input represents an input DTO of the stage2.
@@ -111,15 +99,15 @@ func (u *Setup) DoStage2(ctx context.Context, in Stage2Input) error {
 		GrantOptionSet: in.GrantOptionSet,
 	})
 	if err != nil {
-		return xerrors.Errorf("error while authentication: %w", err)
+		return xerrors.Errorf("authentication error: %w", err)
 	}

 	v := stage2Vars{
-		Claims:    out.IDTokenClaims.Pretty,
-		IssuerURL: in.IssuerURL,
-		ClientID:  in.ClientID,
-		Args:      makeCredentialPluginArgs(in),
-		Subject:   out.IDTokenClaims.Subject,
+		IDTokenPrettyJSON: out.IDTokenClaims.Pretty,
+		IssuerURL:         in.IssuerURL,
+		ClientID:          in.ClientID,
+		Args:              makeCredentialPluginArgs(in),
+		Subject:           out.IDTokenClaims.Subject,
 	}
 	var b strings.Builder
 	if err := stage2Tpl.Execute(&b, &v); err != nil {
--- a/pkg/usecases/setup/stage2_test.go
+++ b/pkg/usecases/setup/stage2_test.go
@@ -8,18 +8,13 @@ import (
 	"github.com/golang/mock/gomock"
 	"github.com/int128/kubelogin/pkg/adaptors/certpool"
 	"github.com/int128/kubelogin/pkg/adaptors/certpool/mock_certpool"
-	"github.com/int128/kubelogin/pkg/adaptors/logger/mock_logger"
-	"github.com/int128/kubelogin/pkg/domain/oidc"
+	"github.com/int128/kubelogin/pkg/domain/jwt"
+	"github.com/int128/kubelogin/pkg/testing/logger"
 	"github.com/int128/kubelogin/pkg/usecases/authentication"
 	"github.com/int128/kubelogin/pkg/usecases/authentication/mock_authentication"
 )

 func TestSetup_DoStage2(t *testing.T) {
-	dummyTokenClaims := oidc.Claims{
-		Subject: "YOUR_SUBJECT",
-		Expiry:  time.Date(2019, 1, 2, 3, 4, 5, 0, time.UTC),
-		Pretty:  map[string]string{"sub": "YOUR_SUBJECT"},
-	}
 	var grantOptionSet authentication.GrantOptionSet
 	ctrl := gomock.NewController(t)
 	defer ctrl.Finish()
@@ -50,14 +45,18 @@ func TestSetup_DoStage2(t *testing.T) {
 			GrantOptionSet: grantOptionSet,
 		}).
 		Return(&authentication.Output{
-			IDToken:       "YOUR_ID_TOKEN",
-			RefreshToken:  "YOUR_REFRESH_TOKEN",
-			IDTokenClaims: dummyTokenClaims,
+			IDToken:      "YOUR_ID_TOKEN",
+			RefreshToken: "YOUR_REFRESH_TOKEN",
+			IDTokenClaims: jwt.Claims{
+				Subject: "YOUR_SUBJECT",
+				Expiry:  time.Date(2019, 1, 2, 3, 4, 5, 0, time.UTC),
+				Pretty:  "PRETTY_JSON",
+			},
 		}, nil)
 	u := Setup{
 		Authentication: mockAuthentication,
 		NewCertPool:    func() certpool.Interface { return mockCertPool },
-		Logger:         mock_logger.New(t),
+		Logger:         logger.New(t),
 	}
 	if err := u.DoStage2(ctx, in); err != nil {
 		t.Errorf("DoStage2 returned error: %+v", err)
--- a/pkg/usecases/standalone/standalone.go
+++ b/pkg/usecases/standalone/standalone.go
@@ -93,11 +93,9 @@ func (u *Standalone) Do(ctx context.Context, in Input) error {
 		GrantOptionSet: in.GrantOptionSet,
 	})
 	if err != nil {
-		return xerrors.Errorf("error while authentication: %w", err)
-	}
-	for k, v := range out.IDTokenClaims.Pretty {
-		u.Logger.V(1).Infof("the ID token has the claim: %s=%v", k, v)
+		return xerrors.Errorf("authentication error: %w", err)
 	}
+	u.Logger.V(1).Infof("you got a token: %s", out.IDTokenClaims.Pretty)
 	if out.AlreadyHasValidIDToken {
 		u.Logger.Printf("You already have a valid token until %s", out.IDTokenClaims.Expiry)
 		return nil
@@ -108,7 +106,7 @@ func (u *Standalone) Do(ctx context.Context, in Input) error {
 	authProvider.RefreshToken = out.RefreshToken
 	u.Logger.V(1).Infof("writing the ID token and refresh token to %s", authProvider.LocationOfOrigin)
 	if err := u.Kubeconfig.UpdateAuthProvider(authProvider); err != nil {
-		return xerrors.Errorf("could not write the token to the kubeconfig: %w", err)
+		return xerrors.Errorf("could not update the kubeconfig: %w", err)
 	}
 	return nil
 }
@@ -168,7 +166,7 @@ func (u *Standalone) showDeprecation(in Input, p *kubeconfig.AuthProvider) error
 	}
 	var b strings.Builder
 	if err := deprecationTpl.Execute(&b, &v); err != nil {
-		return xerrors.Errorf("could not render the template: %w", err)
+		return xerrors.Errorf("template error: %w", err)
 	}
 	u.Logger.Printf("%s", b.String())
 	return nil
--- a/pkg/usecases/standalone/standalone_test.go
+++ b/pkg/usecases/standalone/standalone_test.go
@@ -10,18 +10,18 @@ import (
 	"github.com/int128/kubelogin/pkg/adaptors/certpool/mock_certpool"
 	"github.com/int128/kubelogin/pkg/adaptors/kubeconfig"
 	"github.com/int128/kubelogin/pkg/adaptors/kubeconfig/mock_kubeconfig"
-	"github.com/int128/kubelogin/pkg/adaptors/logger/mock_logger"
-	"github.com/int128/kubelogin/pkg/domain/oidc"
+	"github.com/int128/kubelogin/pkg/domain/jwt"
+	"github.com/int128/kubelogin/pkg/testing/logger"
 	"github.com/int128/kubelogin/pkg/usecases/authentication"
 	"github.com/int128/kubelogin/pkg/usecases/authentication/mock_authentication"
 	"golang.org/x/xerrors"
 )

 func TestStandalone_Do(t *testing.T) {
-	dummyTokenClaims := oidc.Claims{
+	dummyTokenClaims := jwt.Claims{
 		Subject: "YOUR_SUBJECT",
 		Expiry:  time.Date(2019, 1, 2, 3, 4, 5, 0, time.UTC),
-		Pretty:  map[string]string{"sub": "YOUR_SUBJECT"},
+		Pretty:  "PRETTY_JSON",
 	}

 	t.Run("FullOptions", func(t *testing.T) {
@@ -88,7 +88,7 @@ func TestStandalone_Do(t *testing.T) {
 			Authentication: mockAuthentication,
 			Kubeconfig:     mockKubeconfig,
 			NewCertPool:    func() certpool.Interface { return mockCertPool },
-			Logger:         mock_logger.New(t),
+			Logger:         logger.New(t),
 		}
 		if err := u.Do(ctx, in); err != nil {
 			t.Errorf("Do returned error: %+v", err)
@@ -131,7 +131,7 @@ func TestStandalone_Do(t *testing.T) {
 			Authentication: mockAuthentication,
 			Kubeconfig:     mockKubeconfig,
 			NewCertPool:    func() certpool.Interface { return mockCertPool },
-			Logger:         mock_logger.New(t),
+			Logger:         logger.New(t),
 		}
 		if err := u.Do(ctx, in); err != nil {
 			t.Errorf("Do returned error: %+v", err)
@@ -151,7 +151,7 @@ func TestStandalone_Do(t *testing.T) {
 		u := Standalone{
 			Authentication: mockAuthentication,
 			Kubeconfig:     mockKubeconfig,
-			Logger:         mock_logger.New(t),
+			Logger:         logger.New(t),
 		}
 		if err := u.Do(ctx, in); err == nil {
 			t.Errorf("err wants non-nil but nil")
@@ -188,7 +188,7 @@ func TestStandalone_Do(t *testing.T) {
 			Authentication: mockAuthentication,
 			Kubeconfig:     mockKubeconfig,
 			NewCertPool:    func() certpool.Interface { return mockCertPool },
-			Logger:         mock_logger.New(t),
+			Logger:         logger.New(t),
 		}
 		if err := u.Do(ctx, in); err == nil {
 			t.Errorf("err wants non-nil but nil")
@@ -240,7 +240,7 @@ func TestStandalone_Do(t *testing.T) {
 			Authentication: mockAuthentication,
 			Kubeconfig:     mockKubeconfig,
 			NewCertPool:    func() certpool.Interface { return mockCertPool },
-			Logger:         mock_logger.New(t),
+			Logger:         logger.New(t),
 		}
 		if err := u.Do(ctx, in); err == nil {
 			t.Errorf("err wants non-nil but nil")
--- a/snapcraft.yaml
+++ b/snapcraft.yaml
@@ -1,19 +0,0 @@
-name: kubelogin
-version: git
-summary: Log in to the OpenID Connect provider
-description: |
-  This is a kubectl plugin for Kubernetes OpenID Connect (OIDC) authentication.
-confinement: strict
-base: core18
-parts:
-  kubelogin:
-    plugin: nil
-    source: .
-    source-type: git
-    build-snaps: [go]
-    override-build: |
-      make CIRCLE_TAG=$SNAPCRAFT_PROJECT_VERSION
-      cp -av kubelogin $SNAPCRAFT_PART_INSTALL/bin
-apps:
-  kubelogin:
-    command: bin/kubelogin
--- a/system_test/Makefile
+++ b/system_test/Makefile
@@ -0,0 +1,109 @@
+CLUSTER_NAME := kubelogin-system-test
+OUTPUT_DIR := $(CURDIR)/output
+
+PATH := $(PATH):$(OUTPUT_DIR)/bin
+export PATH
+KUBECONFIG := $(OUTPUT_DIR)/kubeconfig.yaml
+export KUBECONFIG
+
+# run the login script instead of opening chrome
+BROWSER := $(OUTPUT_DIR)/bin/chromelogin
+export BROWSER
+
+.PHONY: test
+test: build
+	# see the setup instruction
+	kubectl oidc-login setup \
+		--oidc-issuer-url=https://dex-server:10443/dex \
+		--oidc-client-id=YOUR_CLIENT_ID \
+		--oidc-client-secret=YOUR_CLIENT_SECRET \
+		--oidc-extra-scope=email \
+		--certificate-authority=$(OUTPUT_DIR)/ca.crt
+	# set up the kubeconfig
+	kubectl config set-credentials oidc \
+		--exec-api-version=client.authentication.k8s.io/v1beta1 \
+		--exec-command=kubectl \
+		--exec-arg=oidc-login \
+		--exec-arg=get-token \
+		--exec-arg=--oidc-issuer-url=https://dex-server:10443/dex \
+		--exec-arg=--oidc-client-id=YOUR_CLIENT_ID \
+		--exec-arg=--oidc-client-secret=YOUR_CLIENT_SECRET \
+		--exec-arg=--oidc-extra-scope=email \
+		--exec-arg=--certificate-authority=$(OUTPUT_DIR)/ca.crt
+	# make sure we can access the cluster
+	kubectl --user=oidc cluster-info
+	# switch the current context
+	kubectl config set-context --current --user=oidc
+	# make sure we can access the cluster
+	kubectl cluster-info
+
+.PHONY: setup
+setup: build dex cluster setup-chrome
+
+.PHONY: setup-chrome
+setup-chrome: $(OUTPUT_DIR)/ca.crt
+	# add the dex server certificate to the trust store
+	mkdir -p ~/.pki/nssdb
+	cd ~/.pki/nssdb && certutil -A -d sql:. -n dex -i $(OUTPUT_DIR)/ca.crt -t "TC,,"
+
+# build binaries
+.PHONY: build
+build: $(OUTPUT_DIR)/bin/kubectl-oidc_login $(OUTPUT_DIR)/bin/chromelogin
+$(OUTPUT_DIR)/bin/kubectl-oidc_login:
+	go build -o $@ ..
+$(OUTPUT_DIR)/bin/chromelogin: chromelogin/main.go
+	go build -o $@ ./chromelogin
+
+# create a Dex server
+.PHONY: dex
+dex: $(OUTPUT_DIR)/server.crt $(OUTPUT_DIR)/server.key
+	docker create --name dex-server -p 10443:10443 --network kind quay.io/dexidp/dex:v2.21.0 serve /dex.yaml
+	docker cp $(OUTPUT_DIR)/server.crt dex-server:/
+	docker cp $(OUTPUT_DIR)/server.key dex-server:/
+	docker cp dex.yaml dex-server:/
+	docker start dex-server
+	docker logs dex-server
+
+$(OUTPUT_DIR)/ca.key:
+	mkdir -p $(OUTPUT_DIR)
+	openssl genrsa -out $@ 2048
+$(OUTPUT_DIR)/ca.csr: $(OUTPUT_DIR)/ca.key
+	openssl req -new -key $(OUTPUT_DIR)/ca.key -out $@ -subj "/CN=dex-ca" -config openssl.cnf
+$(OUTPUT_DIR)/ca.crt: $(OUTPUT_DIR)/ca.key $(OUTPUT_DIR)/ca.csr
+	openssl x509 -req -in $(OUTPUT_DIR)/ca.csr -signkey $(OUTPUT_DIR)/ca.key -out $@ -days 10
+$(OUTPUT_DIR)/server.key:
+	mkdir -p $(OUTPUT_DIR)
+	openssl genrsa -out $@ 2048
+$(OUTPUT_DIR)/server.csr: openssl.cnf $(OUTPUT_DIR)/server.key
+	openssl req -new -key $(OUTPUT_DIR)/server.key -out $@ -subj "/CN=dex-server" -config openssl.cnf
+$(OUTPUT_DIR)/server.crt: openssl.cnf $(OUTPUT_DIR)/server.csr $(OUTPUT_DIR)/ca.crt $(OUTPUT_DIR)/ca.key
+	openssl x509 -req -in $(OUTPUT_DIR)/server.csr -CA $(OUTPUT_DIR)/ca.crt -CAkey $(OUTPUT_DIR)/ca.key -CAcreateserial -out $@ -sha256 -days 10 -extensions v3_req -extfile openssl.cnf
+
+# create a Kubernetes cluster
+.PHONY: cluster
+cluster: dex create-cluster
+	# add the Dex container IP to /etc/hosts of kube-apiserver
+	docker inspect -f '{{.NetworkSettings.IPAddress}}' dex-server | sed -e 's,$$, dex-server,' | \
+		kubectl -n kube-system exec -i kube-apiserver-$(CLUSTER_NAME)-control-plane -- tee -a /etc/hosts
+	# wait for kube-apiserver oidc initialization
+	# (oidc authenticator will retry oidc discovery every 10s)
+	sleep 10
+
+.PHONY: create-cluster
+create-cluster: $(OUTPUT_DIR)/ca.crt
+	cp $(OUTPUT_DIR)/ca.crt /tmp/kubelogin-system-test-dex-ca.crt
+	kind create cluster --name $(CLUSTER_NAME) --config cluster.yaml
+	kubectl create clusterrole cluster-readonly --verb=get,watch,list --resource='*.*'
+	kubectl create clusterrolebinding cluster-readonly --clusterrole=cluster-readonly --user=admin@example.com
+
+# clean up the resources
+.PHONY: clean
+clean:
+	-rm -r $(OUTPUT_DIR)
+.PHONY: delete-cluster
+delete-cluster:
+	kind delete cluster --name $(CLUSTER_NAME)
+.PHONY: delete-dex
+delete-dex:
+	docker stop dex-server
+	docker rm dex-server
--- a/system_test/README.md
+++ b/system_test/README.md
@@ -0,0 +1,112 @@
+# kubelogin/system_test
+
+This is an automated test for verifying behavior of the plugin with a real Kubernetes cluster and OIDC provider.
+
+
+## Purpose
+
+This test checks the following points:
+
+1. User can set up Kubernetes OIDC authentication using [setup guide](../docs/setup.md).
+1. User can log in to an OIDC provider on a browser.
+1. User can access the cluster using a token returned from the plugin.
+
+It depends on the following components:
+
+- Kubernetes cluster (Kind)
+- OIDC provider (Dex)
+- Browser (Chrome)
+- kubectl command
+
+
+## How it works
+
+Let's take a look at the diagram.
+
+![diagram](../docs/system-test-diagram.svg)
+
+It prepares the following resources:
+
+1. Generate a pair of CA certificate and TLS server certificate for Dex.
+1. Run Dex on a container.
+1. Create a Kubernetes cluster using Kind.
+1. Mutate `/etc/hosts` of the CI machine to access Dex.
+1. Mutate `/etc/hosts` of the kube-apiserver pod to access Dex.
+
+It performs the test by the following steps:
+
+1. Run kubectl.
+1. kubectl automatically runs kubelogin.
+1. kubelogin automatically runs [chromelogin](chromelogin).
+1. chromelogin opens the browser, navigates to `http://localhost:8000` and enter the username and password.
+1. kubelogin gets an authorization code from the browser.
+1. kubelogin gets a token.
+1. kubectl accesses an API with the token.
+1. kube-apiserver verifies the token by Dex.
+1. Check if kubectl exited with code 0.
+
+
+## Run locally
+
+You need to set up the following components:
+
+- Docker
+- Kind
+- Chrome or Chromium
+
+You need to add the following line to `/etc/hosts` so that the browser can access the Dex.
+
+```
+127.0.0.1 dex-server
+```
+
+Run the test.
+
+```shell script
+# run the test
+make
+
+# clean up
+make delete-cluster
+make delete-dex
+```
+
+
+## Technical consideration
+
+### Network and DNS
+
+Consider the following issues:
+
+- kube-apiserver runs on the host network of the kind container.
+- kube-apiserver cannot resolve a service name by kube-dns.
+- kube-apiserver cannot access a cluster IP.
+- kube-apiserver can access another container via the Docker network.
+- Chrome requires exactly match of domain name between Dex URL and a server certificate.
+
+Consequently,
+
+- kube-apiserver accesses Dex by resolving `/etc/hosts` and via the Docker network.
+- kubelogin and Chrome accesses Dex by resolving `/etc/hosts` and via the Docker network.
+
+### TLS server certificate
+
+Consider the following issues:
+
+- kube-apiserver requires `--oidc-issuer` is HTTPS URL.
+- kube-apiserver requires a CA certificate at startup, if `--oidc-ca-file` is given.
+- kube-apiserver mounts `/usr/local/share/ca-certificates` from the kind container.
+- It is possible to mount a file from the CI machine.
+- It is not possible to issue a certificate using Let's Encrypt in runtime.
+- Chrome requires a valid certificate in `~/.pki/nssdb`.
+
+As a result,
+
+- kube-apiserver uses the CA certificate of `/usr/local/share/ca-certificates/dex-ca.crt`. See the `extraMounts` section of [`cluster.yaml`](cluster.yaml).
+- kubelogin uses the CA certificate in `output/ca.crt`.
+- Chrome uses the CA certificate in `~/.pki/nssdb`.
+
+### Test environment
+
+- Set the issuer URL to kube-apiserver. See [`cluster.yaml`](cluster.yaml).
+- Set `BROWSER` environment variable to run [`chromelogin`](chromelogin) by `xdg-open`.
--- a/acceptance_test/chromelogin/main.go
+++ b/acceptance_test/chromelogin/main.go
--- a/system_test/cluster.yaml
+++ b/system_test/cluster.yaml
@@ -0,0 +1,20 @@
+kind: Cluster
+apiVersion: kind.x-k8s.io/v1alpha4
+# https://github.com/dexidp/dex/blob/master/Documentation/kubernetes.md
+kubeadmConfigPatches:
+  - |
+    apiVersion: kubeadm.k8s.io/v1beta2
+    kind: ClusterConfiguration
+    metadata:
+      name: config
+    apiServer:
+      extraArgs:
+        oidc-issuer-url: https://dex-server:10443/dex
+        oidc-client-id: YOUR_CLIENT_ID
+        oidc-username-claim: email
+        oidc-ca-file: /usr/local/share/ca-certificates/dex-ca.crt
+nodes:
+  - role: control-plane
+    extraMounts:
+      - hostPath: /tmp/kubelogin-system-test-dex-ca.crt
+        containerPath: /usr/local/share/ca-certificates/dex-ca.crt
--- a/acceptance_test/dex.yaml
+++ b/acceptance_test/dex.yaml
--- a/Show More
+++ b/Show More
Author	SHA1	Message	Date
Hidetake Iwata	4f96435e97	Show debug logs in authentication (#325 )	2020-07-14 09:50:02 +09:00
Hidetake Iwata	22005fb715	go mod tidy	2020-07-14 09:14:51 +09:00
dependabot-preview[bot]	8af36b13e4	Build(deps): bump github.com/int128/oauth2cli from 1.11.0 to 1.12.1 (#324 ) Bumps [github.com/int128/oauth2cli](https://github.com/int128/oauth2cli) from 1.11.0 to 1.12.1. - [Release notes](https://github.com/int128/oauth2cli/releases) - [Commits](https://github.com/int128/oauth2cli/compare/v1.11.0...v1.12.1) Signed-off-by: dependabot-preview[bot] <support@dependabot.com> Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>	2020-07-14 07:06:48 +09:00
Hidetake Iwata	f0c399b8fc	go mod tidy	2020-07-05 19:50:26 +09:00
dependabot-preview[bot]	17499aac24	Build(deps): bump k8s.io/client-go from 0.18.4 to 0.18.5 (#320 ) Bumps [k8s.io/client-go](https://github.com/kubernetes/client-go) from 0.18.4 to 0.18.5. - [Release notes](https://github.com/kubernetes/client-go/releases) - [Changelog](https://github.com/kubernetes/client-go/blob/master/CHANGELOG.md) - [Commits](https://github.com/kubernetes/client-go/compare/v0.18.4...v0.18.5) Signed-off-by: dependabot-preview[bot] <support@dependabot.com> Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>	2020-07-03 09:08:57 +09:00
Hidetake Iwata	d81457995d	Add links to use Okta groups claim (#318 ) This will close #250.	2020-06-24 10:18:54 +09:00
Hidetake Iwata	2e7b93a31e	Add issue templates (#317 )	2020-06-24 09:28:52 +09:00
Hidetake Iwata	9aeffbc71e	Update README.md	2020-06-24 01:10:25 +09:00
Hidetake Iwata	c2b0c101af	Change margin of success page (#316 )	2020-06-24 00:53:51 +09:00
Hidetake Iwata	e8161d5a47	go mod tidy	2020-06-23 16:27:05 +09:00
dependabot-preview[bot]	a3946c7f5f	Build(deps): bump k8s.io/client-go from 0.18.3 to 0.18.4 (#309 ) Bumps [k8s.io/client-go](https://github.com/kubernetes/client-go) from 0.18.3 to 0.18.4. - [Release notes](https://github.com/kubernetes/client-go/releases) - [Changelog](https://github.com/kubernetes/client-go/blob/master/CHANGELOG.md) - [Commits](https://github.com/kubernetes/client-go/compare/v0.18.3...v0.18.4) Signed-off-by: dependabot-preview[bot] <support@dependabot.com> Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>	2020-06-23 16:24:41 +09:00
dependabot-preview[bot]	6b880febdb	Build(deps): bump k8s.io/apimachinery from 0.18.3 to 0.18.4 (#310 ) Bumps [k8s.io/apimachinery](https://github.com/kubernetes/apimachinery) from 0.18.3 to 0.18.4. - [Release notes](https://github.com/kubernetes/apimachinery/releases) - [Commits](https://github.com/kubernetes/apimachinery/compare/v0.18.3...v0.18.4) Signed-off-by: dependabot-preview[bot] <support@dependabot.com> Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>	2020-06-23 15:03:51 +09:00
dependabot-preview[bot]	a51c15aec2	Build(deps): bump github.com/google/go-cmp from 0.4.1 to 0.5.0 (#311 ) Bumps [github.com/google/go-cmp](https://github.com/google/go-cmp) from 0.4.1 to 0.5.0. - [Release notes](https://github.com/google/go-cmp/releases) - [Commits](https://github.com/google/go-cmp/compare/v0.4.1...v0.5.0) Signed-off-by: dependabot-preview[bot] <support@dependabot.com> Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>	2020-06-23 15:01:28 +09:00
Hidetake Iwata	77a6b91be8	Change authentication success page more descriptive (#312 ) * Refactor: rename to authcode_browser.go * Change authentication success page more descriptive	2020-06-23 15:00:58 +09:00
Hidetake Iwata	9e27385c0b	Add acceptance test (#315 )	2020-06-23 14:47:29 +09:00
Hidetake Iwata	3c50431a09	Refactor: rename to system test (#314 )	2020-06-22 16:22:03 +09:00
Hidetake Iwata	e41fdf3dcd	Fix error of acceptance test (#313 )	2020-06-22 14:33:54 +09:00
Hidetake Iwata	dd93a6537d	Update README.md	2020-06-14 16:19:52 +09:00
Hidetake Iwata	822f6c86de	Remove redundant information from caveats (#306 ) This reflects the change of https://github.com/kubernetes-sigs/krew-index/pull/635	2020-06-12 18:20:01 +09:00
Hidetake Iwata	dd22ccb9c3	Bump version of github.com/spf13/cobra to v1.0.0 (#305 )	2020-06-12 14:46:59 +09:00
Hidetake Iwata	f6c4a1257d	Update acceptance-test.yaml	2020-06-12 14:35:59 +09:00
Hidetake Iwata	a0c62a9ff1	Move to CircleCI macOS build (#304 )	2020-06-12 14:28:32 +09:00
Andreas Lindhé	0aa3e43e62	Remove install instructions for Github releases (#303 ) * Remove install instructions for Github releases Fixes #301 * Update README.md Co-authored-by: Hidetake Iwata <int128@gmail.com>	2020-06-10 10:37:26 +09:00
Hidetake Iwata	9028199abb	Bump kind version to v0.8.1 (#300 )	2020-06-09 16:22:42 +09:00
ThomasAlxDmy	c308ccb511	CGO_ENABLE as a make option (#299 ) * CGO_ENABLE as a make option * Update Makefile * Update Makefile Co-authored-by: Thomas Dmytryk <tdmytryk@tesla.com> Co-authored-by: Hidetake Iwata <int128@gmail.com>	2020-05-28 00:50:29 +09:00
Hidetake Iwata	ff1aa97d87	go mod tidy	2020-05-23 00:48:37 +09:00
dependabot-preview[bot]	ca21c6568b	Build(deps): bump k8s.io/client-go from 0.18.2 to 0.18.3 (#296 ) Bumps [k8s.io/client-go](https://github.com/kubernetes/client-go) from 0.18.2 to 0.18.3. - [Release notes](https://github.com/kubernetes/client-go/releases) - [Changelog](https://github.com/kubernetes/client-go/blob/master/CHANGELOG.md) - [Commits](https://github.com/kubernetes/client-go/compare/v0.18.2...v0.18.3) Signed-off-by: dependabot-preview[bot] <support@dependabot.com> Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>	2020-05-23 00:48:06 +09:00
dependabot-preview[bot]	117a8d35d4	Build(deps): bump github.com/google/go-cmp from 0.4.0 to 0.4.1 (#294 ) Bumps [github.com/google/go-cmp](https://github.com/google/go-cmp) from 0.4.0 to 0.4.1. - [Release notes](https://github.com/google/go-cmp/releases) - [Commits](https://github.com/google/go-cmp/compare/v0.4.0...v0.4.1) Signed-off-by: dependabot-preview[bot] <support@dependabot.com> Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>	2020-05-22 21:51:49 +09:00
Hidetake Iwata	5557290105	Bump the version to v1.19.1	2020-05-16 18:25:10 +09:00
Hidetake Iwata	fe85419312	go mod tidy	2020-05-16 18:07:23 +09:00
dependabot-preview[bot]	d8d810bc0d	Build(deps): bump k8s.io/client-go from 0.18.1 to 0.18.2 (#277 ) Bumps [k8s.io/client-go](https://github.com/kubernetes/client-go) from 0.18.1 to 0.18.2. - [Release notes](https://github.com/kubernetes/client-go/releases) - [Changelog](https://github.com/kubernetes/client-go/blob/master/CHANGELOG.md) - [Commits](https://github.com/kubernetes/client-go/compare/v0.18.1...v0.18.2) Signed-off-by: dependabot-preview[bot] <support@dependabot.com> Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>	2020-05-16 17:49:11 +09:00
dependabot-preview[bot]	170eeb4ed5	Build(deps): bump gopkg.in/yaml.v2 from 2.2.8 to 2.3.0 (#288 ) Bumps [gopkg.in/yaml.v2](https://github.com/go-yaml/yaml) from 2.2.8 to 2.3.0. - [Release notes](https://github.com/go-yaml/yaml/releases) - [Commits](https://github.com/go-yaml/yaml/compare/v2.2.8...v2.3.0) Signed-off-by: dependabot-preview[bot] <support@dependabot.com> Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>	2020-05-16 16:50:25 +09:00
Michael Goodwin	01637fbe12	Update brew template to include support for LinuxBrew (#291 ) This commit introduces an OS check, and extra variables `baseurl` and `kernel` to determine the right archive to download based on the platform. `baseurl` is used to compose the full URI with `#{version}` and `#{kernel}` ruby variables	2020-05-16 16:28:33 +09:00
Hidetake Iwata	e152e95a9f	Refactor: add integration test of PKCE (#293 ) * Refactor: add integration test of PKCE * Refactor: fix name to pkce/Params.IsZero()	2020-05-16 14:29:42 +09:00
Hidetake Iwata	bf8eefd045	Refactor: reduce test cases of integration test (#292 )	2020-05-14 16:49:39 +09:00
Hidetake Iwata	e88138c640	Refactor: fix token verifier does not respect clock (#290 )	2020-05-13 15:45:14 +09:00
Hidetake Iwata	9ad520ba22	Refactor: inject stdout mock in integration test (#289 )	2020-05-13 11:25:59 +09:00
Hidetake Iwata	35e8ecab8d	Refactor: replace newCredentialPluginWriterMock (#287 ) * Refactor: replace newCredentialPluginWriterMock * Refactor: remove unused mock and files	2020-05-12 14:36:13 +09:00
Hidetake Iwata	c5621239e8	Refactor: remove unused mock and files	2020-05-12 14:17:19 +09:00
Hidetake Iwata	582ca48092	Refactor: replace newCredentialPluginWriterMock	2020-05-12 14:17:18 +09:00
Hidetake Iwata	da32d2184d	Refactor: remove Server.NewTokenResponse() (#286 )	2020-05-11 20:41:46 +09:00
Hidetake Iwata	3a9768d6de	Refactor: extract httpdriver package (#285 )	2020-05-11 12:06:11 +09:00
Hidetake Iwata	16d6fa2fbb	Refactor: replace idp mock with oidcserver package (#284 )	2020-05-11 11:51:21 +09:00
Hidetake Iwata	175275bf3d	Fix to send challenge only if provider supports PKCE (#283 )	2020-05-08 22:19:32 +09:00
Hidetake Iwata	4ffc914d0e	Bump the version	2020-04-11 17:14:59 +09:00
Hidetake Iwata	fa008bef55	Add linux_arm and linux_arm64 binary to distribution (#275 )	2020-04-11 17:14:00 +09:00
Hidetake Iwata	50047417ab	Delete snapcraft.yaml	2020-04-11 16:10:48 +09:00
Hidetake Iwata	4c0ebb0284	go mod tidy	2020-04-11 15:57:57 +09:00
dependabot-preview[bot]	c1173accd3	Build(deps): bump k8s.io/client-go from 0.18.0 to 0.18.1 (#273 ) Bumps [k8s.io/client-go](https://github.com/kubernetes/client-go) from 0.18.0 to 0.18.1. - [Release notes](https://github.com/kubernetes/client-go/releases) - [Changelog](https://github.com/kubernetes/client-go/blob/master/CHANGELOG.md) - [Commits](https://github.com/kubernetes/client-go/compare/v0.18.0...v0.18.1) Signed-off-by: dependabot-preview[bot] <support@dependabot.com> Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>	2020-04-11 15:57:17 +09:00
Hidetake Iwata	d4addcfc6e	Show Go version, GOOS and GOARCH in version command (#272 )	2020-04-11 11:39:49 +09:00
Hidetake Iwata	695347e419	Merge pull request #271 from int128/refactor Refactor integration test	2020-04-10 20:39:18 +09:00
Hidetake Iwata	d5c738697f	Refactor: tidy up	2020-04-10 20:32:22 +09:00
Hidetake Iwata	777a60c96c	Refactor: rename package	2020-04-10 17:15:02 +09:00
Hidetake Iwata	6f6e0723f1	Refactor: extract integration_test.authCodeFlowConfig	2020-04-10 16:32:02 +09:00
Hidetake Iwata	3fb074a4a8	Refactor: replace ClusterRoleBinding manifest with kubectl command (#270 )	2020-04-08 20:38:35 +09:00
Hidetake Iwata	59b5f1bd89	Add --oidc-redirect-url-hostname flag (#269 )	2020-04-08 15:25:19 +09:00
Hidetake Iwata	70819843f0	go mod tidy	2020-04-07 10:30:13 +09:00
dependabot-preview[bot]	87c46a24ae	Build(deps): bump github.com/int128/oauth2cli from 1.10.0 to 1.11.0 (#268 ) Bumps [github.com/int128/oauth2cli](https://github.com/int128/oauth2cli) from 1.10.0 to 1.11.0. - [Release notes](https://github.com/int128/oauth2cli/releases) - [Commits](https://github.com/int128/oauth2cli/compare/v1.10.0...v1.11.0) Signed-off-by: dependabot-preview[bot] <support@dependabot.com> Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>	2020-04-07 10:27:30 +09:00
Hidetake Iwata	ac504150b2	Bump k8s.io/apimachinery, k8s.io/client-go to 0.18.0 (#267 )	2020-04-06 21:58:53 +09:00
Hidetake Iwata	caeb55f21d	Refactor: enable Go module cache (#264 )	2020-04-02 20:08:52 +09:00
dependabot-preview[bot]	2ccda6099f	Build(deps): bump github.com/spf13/cobra from 0.0.6 to 0.0.7 (#263 ) Bumps [github.com/spf13/cobra](https://github.com/spf13/cobra) from 0.0.6 to 0.0.7. - [Release notes](https://github.com/spf13/cobra/releases) - [Commits](https://github.com/spf13/cobra/compare/v0.0.6...0.0.7) Signed-off-by: dependabot-preview[bot] <support@dependabot.com> Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>	2020-03-31 11:34:19 +09:00
MOZGIII	7f4f72c9e0	Correct the command args at stage 2 instructions (#261 )	2020-03-29 18:26:29 +09:00
Hidetake Iwata	bfc1568057	Bump the version	2020-03-26 10:36:06 +09:00
Hidetake Iwata	8758d55bb3	go mod tidy	2020-03-26 10:29:32 +09:00
dependabot-preview[bot]	d9be392f5a	Build(deps): bump k8s.io/client-go from 0.17.3 to 0.17.4 (#252 ) Bumps [k8s.io/client-go](https://github.com/kubernetes/client-go) from 0.17.3 to 0.17.4. - [Release notes](https://github.com/kubernetes/client-go/releases) - [Changelog](https://github.com/kubernetes/client-go/blob/master/CHANGELOG.md) - [Commits](https://github.com/kubernetes/client-go/compare/v0.17.3...v0.17.4) Signed-off-by: dependabot-preview[bot] <support@dependabot.com> Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>	2020-03-26 10:24:49 +09:00
dependabot-preview[bot]	af840a519c	Build(deps): bump github.com/golang/mock from 1.4.0 to 1.4.3 (#253 ) Bumps [github.com/golang/mock](https://github.com/golang/mock) from 1.4.0 to 1.4.3. - [Release notes](https://github.com/golang/mock/releases) - [Changelog](https://github.com/golang/mock/blob/master/.goreleaser.yml) - [Commits](https://github.com/golang/mock/compare/v1.4.0...v1.4.3) Signed-off-by: dependabot-preview[bot] <support@dependabot.com> Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>	2020-03-26 10:24:31 +09:00
Hidetake Iwata	285b3b15a8	Bump to Go 1.14.1 (#258 )	2020-03-26 10:13:54 +09:00
Matthew M. Boedicker	123d7c8124	Add --oidc-extra-url-params argument (#255 ) * Add --oidc-extra-url-params argument This accepts a comma-separated list of key-value pairs that will be added to get token requests as query string parameters. Closes #254. * Refactor - move code setting the extra params to the authorization code flow specific functions (it is not needed in ROPC flow) - add unit tests - rename flag to --oidc-auth-request-extra-params - add description to README.md * Add integration test for --oidc-auth-request-extra-params Co-authored-by: Hidetake Iwata <int128@gmail.com>	2020-03-25 11:52:53 +09:00
Hidetake Iwata	e2a6b5d4e2	Update README.md	2020-03-06 10:26:06 +09:00
dependabot-preview[bot]	ce93c739f8	Build(deps): bump github.com/int128/oauth2cli from 1.9.0 to 1.10.0 (#246 ) Bumps [github.com/int128/oauth2cli](https://github.com/int128/oauth2cli) from 1.9.0 to 1.10.0. - [Release notes](https://github.com/int128/oauth2cli/releases) - [Commits](https://github.com/int128/oauth2cli/compare/v1.9.0...v1.10.0) Signed-off-by: dependabot-preview[bot] <support@dependabot.com>	2020-02-28 22:08:48 +09:00
Hidetake Iwata	dc646c88f9	Bump version to v1.17.1	2020-02-22 16:04:29 +09:00
Hidetake Iwata	07e34d2222	Refactor (#245 ) * Refactor: use Command.Context * Refactor: do not infer command name for help/version	2020-02-22 15:40:43 +09:00
Hidetake Iwata	0e2d402c40	Bump github.com/int128/oauth2cli to v1.9.0 (#244 ) * Bump github.com/int128/oauth2cli to v1.9.0 * Generate state parameter and pass to oauth2cli * Refactor: use base64.NoPadding	2020-02-22 15:26:54 +09:00
Hidetake Iwata	db7c260f9d	go mod tidy	2020-02-22 12:41:11 +09:00
dependabot-preview[bot]	a95dc5c794	Build(deps): bump github.com/spf13/cobra from 0.0.5 to 0.0.6 (#239 ) Bumps [github.com/spf13/cobra](https://github.com/spf13/cobra) from 0.0.5 to 0.0.6. - [Release notes](https://github.com/spf13/cobra/releases) - [Commits](https://github.com/spf13/cobra/compare/0.0.5...v0.0.6) Signed-off-by: dependabot-preview[bot] <support@dependabot.com>	2020-02-22 12:39:26 +09:00
dependabot-preview[bot]	846804f611	Build(deps): bump k8s.io/client-go from 0.17.2 to 0.17.3 (#236 ) Bumps [k8s.io/client-go](https://github.com/kubernetes/client-go) from 0.17.2 to 0.17.3. - [Release notes](https://github.com/kubernetes/client-go/releases) - [Changelog](https://github.com/kubernetes/client-go/blob/master/CHANGELOG.md) - [Commits](https://github.com/kubernetes/client-go/compare/v0.17.2...v0.17.3) Signed-off-by: dependabot-preview[bot] <support@dependabot.com>	2020-02-22 12:32:56 +09:00
Hidetake Iwata	8b9e31b4c5	Refactor: error messages and testing/logger (#243 ) * Refactor: respect -v option in testing/logger * Refactor: revise error messages	2020-02-22 12:31:00 +09:00
Hidetake Iwata	bc99af6eab	Merge pull request #242 from int128/refactor Refactor	2020-02-21 23:37:32 +09:00
Hidetake Iwata	e3bec130f4	Refactor: fix mock package path	2020-02-21 22:59:59 +09:00
Hidetake Iwata	d59e3355fe	Refactor: rename to adaptor/reader	2020-02-21 22:56:43 +09:00
Hidetake Iwata	9d2d0109d5	Refactor: extract adaptor/clock and testing/clock	2020-02-21 22:49:48 +09:00
Hidetake Iwata	aac8780caf	Refactor: move to testing/logger	2020-02-21 22:39:27 +09:00
Hidetake Iwata	f89525b184	Refactor: extract domain/jwt and testing/jwt (#241 ) * Refactor: extract domain/jwt and testing/jwt * Refactor: remove jwt-go dep from product code	2020-02-21 22:33:08 +09:00
Hidetake Iwata	a46dab3dfd	Fix error if multiple aud claim is given (#240 )	2020-02-21 09:58:01 +09:00