Dump all claims of ID token to debug log (#68 )

* Dump all claims of ID token to debug log * Add dump when a user already has a token
Fix error of go get and remove golint (#69 )
2026-03-01 00:10:20 +00:00 · 2019-04-19 10:47:32 +09:00 · 2019-04-19 10:46:07 +09:00
161 changed files with 3071 additions and 9056 deletions
--- a/.circleci/Makefile
+++ b/.circleci/Makefile
@@ -1,17 +0,0 @@
-.PHONY: all
-all:
-
-.PHONY: install-test-deps
-install-test-deps:
-	curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b $(HOME)/go/bin v1.24.0
-	go get -v github.com/int128/goxzst
-
-.PHONY: install-release-deps
-install-release-deps: go
-	go get -v github.com/int128/goxzst github.com/int128/ghcp
-
-go:
-	curl -sSfL -o go.tgz "https://golang.org/dl/go`ruby go_version_from_config.rb < config.yml`.darwin-amd64.tar.gz"
-	tar -xf go.tgz
-	rm go.tgz
-	./go/bin/go version
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -1,60 +1,38 @@
-version: 2.1
-
+version: 2
 jobs:
-  test:
+  build:
    docker:
-      - image: cimg/go:1.14.6
+      - image: circleci/golang:1.12.3
    steps:
+      - run: |
+          mkdir -p ~/bin
+          echo 'export PATH="$HOME/bin:$PATH"' >> $BASH_ENV
+      - run: |
+          curl -L -o ~/bin/kubectl https://storage.googleapis.com/kubernetes-release/release/v1.14.0/bin/linux/amd64/kubectl
+          chmod +x ~/bin/kubectl
+      - run: |
+          curl -L -o ~/bin/ghcp https://github.com/int128/ghcp/releases/download/v1.3.0/ghcp_linux_amd64
+          chmod +x ~/bin/ghcp
+      - run: |
+          go get -v \
+            github.com/int128/goxzst \
+            github.com/tcnksm/ghr
      - checkout
-      - restore_cache:
-          keys:
-            - go-sum-{{ checksum "go.sum" }}
-      - run: make -C .circleci install-test-deps
+      # workaround for https://github.com/golang/go/issues/27925
+      - run: sed -e '/^k8s.io\/client-go /d' -i go.sum
      - run: make check
-      - run: bash <(curl -s https://codecov.io/bash)
-      - run: make dist
-      - save_cache:
-          key: go-sum-{{ checksum "go.sum" }}
-          paths:
-            - ~/go/pkg
-      - store_artifacts:
-          path: gotest.log
-
-  release:
-    macos:
-      # https://circleci.com/docs/2.0/testing-ios/
-      xcode: 11.5.0
-    steps:
-      - run: echo 'export PATH="$HOME/go/bin:$PWD/.circleci/go/bin:$PATH"' >> $BASH_ENV
-      - checkout
-      - restore_cache:
-          keys:
-            - go-macos-{{ checksum "go.sum" }}
-      - run: make -C .circleci install-release-deps
-      - run: make dist
+      - run: make run
      - run: |
          if [ "$CIRCLE_TAG" ]; then
            make release
          fi
-      - save_cache:
-          key: go-macos-{{ checksum "go.sum" }}
-          paths:
-            - ~/go/pkg

 workflows:
  version: 2
-  build:
+  all:
    jobs:
-      - test:
-          filters:
-            tags:
-              only: /^v.*/
-      - release:
+      - build:
          context: open-source
-          requires:
-            - test
          filters:
-            branches:
-              only: /^release-feature.*/
            tags:
-              only: /^v.*/
+              only: /.*/
--- a/.circleci/go.mod
+++ b/.circleci/go.mod
@@ -1,3 +0,0 @@
-module github.com/int128/kubelogin/.circleci
-
-go 1.13
--- a/.circleci/go_version_from_config.rb
+++ b/.circleci/go_version_from_config.rb
@@ -1,11 +0,0 @@
-require 'yaml'
-
-config = YAML.load(STDIN)
-
-image = config["jobs"]["test"]["docker"][0]["image"]
-if !image.start_with?("cimg/go:")
-  raise "unknown image #{image} in #{configPath}"
-end
-
-goVersion = image.delete_prefix("cimg/go:")
-print(goVersion)
--- a/.github/FUNDING.yml
+++ b/.github/FUNDING.yml
@@ -1,12 +0,0 @@
-# These are supported funding model platforms
-
-github: [int128] # Replace with up to 4 GitHub Sponsors-enabled usernames e.g., [user1, user2]
-patreon: # Replace with a single Patreon username
-open_collective: # Replace with a single Open Collective username
-ko_fi: # Replace with a single Ko-fi username
-tidelift: # Replace with a single Tidelift platform-name/package-name e.g., npm/babel
-community_bridge: # Replace with a single Community Bridge project-name e.g., cloud-foundry
-liberapay: # Replace with a single Liberapay username
-issuehunt: # Replace with a single IssueHunt username
-otechie: # Replace with a single Otechie username
-custom: # Replace with up to 4 custom sponsorship URLs e.g., ['link1', 'link2']
--- a/.github/ISSUE_TEMPLATE/bug_report.md
+++ b/.github/ISSUE_TEMPLATE/bug_report.md
@@ -1,23 +0,0 @@
---
-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
@@ -1,17 +0,0 @@
---
-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/renovate.json
+++ b/.github/renovate.json
@@ -1,8 +0,0 @@
-{
-  "extends": [
-    "config:base"
-  ],
-  "postUpdateOptions": [
-    "gomodTidy"
-  ]
-}
--- a/.github/workflows/system-test.yaml
+++ b/.github/workflows/system-test.yaml
@@ -1,29 +0,0 @@
-on: [push]
-jobs:
-  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: 1.14.1
-        id: go
-      - uses: actions/checkout@v1
-      - uses: actions/cache@v1
-        with:
-          path: ~/go/pkg/mod
-          key: go-${{ hashFiles('**/go.sum') }}
-          restore-keys: |
-            go-
-      # https://kind.sigs.k8s.io/docs/user/quick-start/
-      - run: |
-          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 system_test -j3 setup
-      - run: make -C system_test test
--- a/.gitignore
+++ b/.gitignore
@@ -1,13 +1,5 @@
 /.idea
-
-/system_test/output/
-/acceptance_test/output/
-
-/dist/output
-/coverage.out
-/gotest.log
-
+/dist
 /kubelogin
 /kubectl-oidc_login
-
-/.circleci/go/
+/.kubeconfig
--- a/60
+++ b/60
@@ -1,49 +1,35 @@
-# CircleCI specific variables
-CIRCLE_TAG ?= latest
-GITHUB_USERNAME := $(CIRCLE_PROJECT_USERNAME)
-GITHUB_REPONAME := $(CIRCLE_PROJECT_REPONAME)
-
 TARGET := kubelogin
-TARGET_OSARCH := linux_amd64 darwin_amd64 windows_amd64 linux_arm linux_arm64
-VERSION ?= $(CIRCLE_TAG)
-LDFLAGS := -X main.version=$(VERSION)
+TARGET_PLUGIN := kubectl-oidc_login
+CIRCLE_TAG ?= HEAD
+LDFLAGS := -X main.version=$(CIRCLE_TAG)
+
+.PHONY: check run release clean

 all: $(TARGET)

-$(TARGET): $(wildcard **/*.go)
+check:
+	go vet
+	$(MAKE) -C adaptors_test/keys/testdata
+	go test -v -race ./...
+
+$(TARGET): $(wildcard *.go)
 	go build -o $@ -ldflags "$(LDFLAGS)"

-.PHONY: check
-check:
-	golangci-lint run
-	go test -v -race -cover -coverprofile=coverage.out ./... > gotest.log
+$(TARGET_PLUGIN): $(TARGET)
+	ln -sf $(TARGET) $@

-.PHONY: dist
-dist: dist/output
-dist/output:
-	# make the zip files for GitHub Releases
-	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
-	mkdir -p dist/output/plugins
-	mv dist/output/oidc-login.yaml dist/output/plugins/oidc-login.yaml
+run: $(TARGET_PLUGIN)
+	-PATH=.:$(PATH) kubectl oidc-login --help
+
+dist:
+	VERSION=$(CIRCLE_TAG) goxzst -d dist/gh/ -o "$(TARGET)" -t "kubelogin.rb oidc-login.yaml" -- -ldflags "$(LDFLAGS)"
+	mv dist/gh/kubelogin.rb dist/

-.PHONY: release
 release: dist
-	# publish the binaries
-	ghcp release -u "$(GITHUB_USERNAME)" -r "$(GITHUB_REPONAME)" -t "$(VERSION)" dist/output/
-	# publish the Homebrew formula
-	ghcp commit -u "$(GITHUB_USERNAME)" -r "homebrew-$(GITHUB_REPONAME)" -b "bump-$(VERSION)" -m "Bump the version to $(VERSION)" -C dist/output/ kubelogin.rb
-	ghcp pull-request -u "$(GITHUB_USERNAME)" -r "homebrew-$(GITHUB_REPONAME)" -b "bump-$(VERSION)" --title "Bump the version to $(VERSION)"
-	# publish the Dockerfile
-	ghcp commit -u "$(GITHUB_USERNAME)" -r "$(GITHUB_REPONAME)-docker" -b "bump-$(VERSION)" -m "Bump the version to $(VERSION)" -C dist/output/ Dockerfile
-	ghcp pull-request -u "$(GITHUB_USERNAME)" -r "$(GITHUB_REPONAME)-docker" -b "bump-$(VERSION)" --title "Bump the version to $(VERSION)"
-	# publish the Krew manifest
-	ghcp fork-commit -u kubernetes-sigs -r krew-index -b "oidc-login-$(VERSION)" -m "Bump oidc-login to $(VERSION)" -C dist/output/ plugins/oidc-login.yaml
+	ghr -u "$(CIRCLE_PROJECT_USERNAME)" -r "$(CIRCLE_PROJECT_REPONAME)" "$(CIRCLE_TAG)" dist/gh/
+	ghcp -u "$(CIRCLE_PROJECT_USERNAME)" -r "homebrew-$(CIRCLE_PROJECT_REPONAME)" -m "$(CIRCLE_TAG)" -C dist/ kubelogin.rb

-.PHONY: clean
 clean:
 	-rm $(TARGET)
-	-rm -r dist/output/
-	-rm coverage.out gotest.log
+	-rm $(TARGET_PLUGIN)
+	-rm -r dist/
--- a/README.md
+++ b/README.md
@@ -1,338 +1,140 @@
-# 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)
+# kubelogin [![CircleCI](https://circleci.com/gh/int128/kubelogin.svg?style=shield)](https://circleci.com/gh/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/321266/85427290-86e43700-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.
-Then kubelogin gets a token from the provider and kubectl access Kubernetes APIs with the token.
-Take a look at the diagram:
-
-![Diagram of the credential plugin](docs/credential-plugin-diagram.svg)
+This is a kubectl plugin for [Kubernetes OpenID Connect (OIDC) authentication](https://kubernetes.io/docs/reference/access-authn-authz/authentication/#openid-connect-tokens).
+It gets a token from the OIDC provider and writes it to the kubeconfig.


 ## Getting Started

-### Setup
+You need to setup the following components:

-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).
+- OIDC provider
+- Kubernetes API server
+- Role for your group or user
+- kubectl authentication
+
+You can 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:

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

-# Krew (macOS, Linux, Windows and ARM)
+# Krew
 kubectl krew install oidc-login
+
+# GitHub Releases
+curl -LO https://github.com/int128/kubelogin/releases/download/v1.9.1/kubelogin_linux_amd64.zip
+unzip kubelogin_linux_amd64.zip
+ln -s kubelogin kubectl-oidc_login
 ```

-You need to set up the OIDC provider, cluster role binding, Kubernetes API server and kubeconfig.
-The kubeconfig looks like:
+After initial setup or when the token has been expired, just run:

-```yaml
-users:
- name: oidc
-  user:
-    exec:
-      apiVersion: client.authentication.k8s.io/v1beta1
-      command: kubectl
-      args:
-      - oidc-login
-      - get-token
-      - --oidc-issuer-url=ISSUER_URL
-      - --oidc-client-id=YOUR_CLIENT_ID
-      - --oidc-client-secret=YOUR_CLIENT_SECRET
+```
+% kubelogin
+Using current-context: hello.k8s.local
+Open http://localhost:8000 for authorization
+Got a token for subject 0123456789 (valid until 2019-04-12 11:00:49 +0900 JST)
+Updated ~/.kube/config
 ```

-See [setup guide](docs/setup.md) for more.
+or run as a kubectl plugin:
+
+```
+% kubectl oidc-login
+```
+
+It opens the browser and you can log in to the provider.
+After authentication, it gets an ID token and refresh token and writes them to the kubeconfig.
+
+For more, see the following documents:
+
+- [Getting Started with Keycloak](docs/keycloak.md)
+- [Getting Started with Google Identity Platform](docs/google.md)
+- [Team Operation](docs/team_ops.md)


-### Run
+## Configuration

-Run kubectl.
+This supports the following options.
+
+```
+  kubelogin [OPTIONS]
+
+Application Options:
+      --kubeconfig=               Path to the kubeconfig file (default: ~/.kube/config) [$KUBECONFIG]
+      --listen-port=              Port used by kubelogin to bind its webserver (default: 8000) [$KUBELOGIN_LISTEN_PORT]
+      --insecure-skip-tls-verify  If set, the server's certificate will not be checked for validity. This will make your HTTPS connections insecure
+                                  [$KUBELOGIN_INSECURE_SKIP_TLS_VERIFY]
+      --skip-open-browser         If set, it does not open the browser on authentication. [$KUBELOGIN_SKIP_OPEN_BROWSER]
+  -v, --v=                        If set to 1 or greater, show debug log (default: 0)
+
+Help Options:
+  -h, --help        Show this help message
+```
+
+This also supports the following keys of `auth-provider` in kubeconfig.
+See [kubectl authentication](https://kubernetes.io/docs/reference/access-authn-authz/authentication/#using-kubectl).
+
+Key | Direction | Value
+----|-----------|------
+`idp-issuer-url`                  | Read (Mandatory) | Issuer URL of the provider.
+`client-id`                       | Read (Mandatory) | Client ID of the provider.
+`client-secret`                   | Read (Mandatory) | Client Secret of the provider.
+`idp-certificate-authority`       | Read | CA certificate path of the provider.
+`idp-certificate-authority-data`  | Read | Base64 encoded CA certificate of the provider.
+`extra-scopes`                    | Read | Scopes to request to the provider (comma separated).
+`id-token`                        | Write | ID token got from the provider.
+`refresh-token`                   | Write | Refresh token got from the provider.
+
+
+### Kubeconfig path
+
+You can set the environment variable `KUBECONFIG` to point the config file.
+Default to `~/.kube/config`.

 ```sh
-kubectl get pods
+export KUBECONFIG="$PWD/.kubeconfig"
 ```

-Kubectl executes kubelogin before calling the Kubernetes APIs.
-Kubelogin automatically opens the browser and you can log in to the provider.
-
-<img src="docs/keycloak-login.png" alt="keycloak-login" width="455" height="329">
-
-After authentication, kubelogin returns the credentials to kubectl and finally kubectl calls the Kubernetes APIs with the credential.
-
-```
-% kubectl get pods
-Open http://localhost:8000 for authentication
-NAME                          READY   STATUS    RESTARTS   AGE
-echoserver-86c78fdccd-nzmd5   1/1     Running   0          26d
-```
-
-Kubelogin writes the ID token and refresh token to the token cache file.
-
-If the cached ID token is valid, kubelogin just returns it.
-If the cached ID token has expired, kubelogin will refresh the token using the refresh token.
-If the refresh token has expired, kubelogin will perform reauthentication.
-
-
-### Troubleshoot
-
-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 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": "********",
-  ...
-}
-```
-
-You can verify kubelogin works with your provider using [acceptance test](acceptance_test).
-
-
-## Usage
-
-This document is for the development version.
-If you are looking for a specific version, see [the release tags](https://github.com/int128/kubelogin/tags).
-
-Kubelogin supports the following options:
-
-```
-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
-      --token-cache-dir string                          Path to a directory for token cache (default "~/.kube/cache/oidc-login")
-      --certificate-authority string                    Path to a cert file for the certificate authority
-      --certificate-authority-data string               Base64 encoded cert for the certificate authority
-      --insecure-skip-tls-verify                        If set, the server's certificate will not be checked for validity. This will make your HTTPS connections insecure
-      --grant-type string                               Authorization grant type to use. One of (auto|authcode|authcode-keyboard|password) (default "auto")
-      --listen-address strings                          [authcode] Address to bind to the local server. If multiple addresses are set, it will try binding in order (default [127.0.0.1:8000,127.0.0.1:18000])
-      --skip-open-browser                               [authcode] Do not open the browser automatically
-      --open-url-after-authentication string            [authcode] If set, open the URL in the browser after authentication
-      --oidc-redirect-url-hostname string               [authcode] Hostname of the redirect URL (default "localhost")
-      --oidc-auth-request-extra-params stringToString   [authcode, authcode-keyboard] Extra query parameters to send with an authentication request (default [])
-      --username string                                 [password] Username for resource owner password credentials grant
-      --password string                                 [password] Password for resource owner password credentials grant
-  -h, --help                                            help for get-token
-
-Global Flags:
-      --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
-```
-
-See also the options of [standalone mode](docs/standalone-mode.md).

 ### Extra scopes

-You can set the extra scopes to request to the provider by `--oidc-extra-scope`.
+You can set extra scopes to request to the provider by `extra-scopes` in the kubeconfig.

-```yaml
-      - --oidc-extra-scope=email
-      - --oidc-extra-scope=profile
+```sh
+kubectl config set-credentials keycloak --auth-provider-arg extra-scopes=email
 ```

-### CA Certificate
+Note that kubectl does not accept multiple scopes and you need to edit the kubeconfig as like:

-You can use your self-signed certificate for the provider.
-
-```yaml
-      - --certificate-authority=/home/user/.kube/keycloak-ca.pem
-      - --certificate-authority-data=LS0t...
+```sh
+kubectl config set-credentials keycloak --auth-provider-arg extra-scopes=SCOPES
+sed -i '' -e s/SCOPES/email,profile/ $KUBECONFIG
 ```

+
+### CA Certificates
+
+You can set your self-signed certificates for the OIDC provider (not Kubernetes API server) by `idp-certificate-authority` and `idp-certificate-authority-data` in the kubeconfig.
+
+```sh
+kubectl config set-credentials keycloak \
+  --auth-provider-arg idp-certificate-authority=$HOME/.kube/keycloak-ca.pem
+```
+
+If kubelogin could not parse the certificate, it shows a warning and skips it.
+
+
 ### HTTP Proxy

 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).

-### Authentication flows
-
-#### Authorization code flow
-
-Kubelogin performs the authorization code flow by default.
-
-It starts the local server at port 8000 or 18000 by default.
-You need to register the following redirect URIs to the provider:
-
- `http://localhost:8000`
- `http://localhost:18000` (used if port 8000 is already in use)
-
-You can change the listening address.
-
-```yaml
-      - --listen-address=127.0.0.1:12345
-      - --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
-```
-
-When authentication completed, kubelogin shows a message to close the browser.
-You can change the URL to show after authentication.
-
-```yaml
-      - --open-url-after-authentication=https://example.com/success.html
-```
-
-#### Authorization code flow with keyboard interactive
-
-If you cannot access the browser, instead use the authorization code flow with keyboard interactive.
-
-```yaml
-      - --grant-type=authcode-keyboard
-```
-
-Kubelogin will show the URL and prompt.
-Open the URL in the browser and then copy the code shown.
-
-```
-% kubectl get pods
-Open https://accounts.google.com/o/oauth2/v2/auth?access_type=offline&client_id=...
-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
-when `--grant-type=password` or `--username` is set.
-
-Note that most OIDC providers do not support this flow.
-Keycloak supports this flow but you need to explicitly enable the "Direct Access Grants" feature in the client settings.
-
-You can set the username and password.
-
-```yaml
-      - --username=USERNAME
-      - --password=PASSWORD
-```
-
-If the password is not set, kubelogin will show the prompt for the password.
-
-```yaml
-      - --username=USERNAME
-```
-
-```
-% kubectl get pods
-Password:
-```
-
-If the username is not set, kubelogin will show the prompt for the username and password.
-
-```yaml
-      - --grant-type=password
-```
-
-```
-% kubectl get pods
-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
-
-### Kubernetes Dashboard
-
-You can access the Kubernetes Dashboard using kubelogin and [kauthproxy](https://github.com/int128/kauthproxy).
-

 ## Contributions

 This is an open source software licensed under Apache License 2.0.
+
 Feel free to open issues and pull requests for improving code and documents.
-
-### Development
-
-Go 1.13 or later is required.
-
-```sh
-# Run lint and tests
-make check
-
-# Compile and run the command
-make
-./kubelogin
-```
-
-See also [the system test](system_test).
--- a/acceptance_test/Makefile
+++ b/acceptance_test/Makefile
@@ -1,42 +0,0 @@
-CLUSTER_NAME := kubelogin-acceptance-test
-OUTPUT_DIR := $(CURDIR)/output
-
-KUBECONFIG := $(OUTPUT_DIR)/kubeconfig.yaml
-export KUBECONFIG
-
-# create a Kubernetes cluster
-.PHONY: cluster
-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
-clean:
-	-rm -r $(OUTPUT_DIR)
-.PHONY: delete-cluster
-delete-cluster:
-	kind delete cluster --name $(CLUSTER_NAME)
-
-.PHONY: check
-check:
-	docker version
-	kind version
-	kubectl version --client
--- a/acceptance_test/README.md
+++ b/acceptance_test/README.md
@@ -1,75 +0,0 @@
-# kubelogin/acceptance_test
-
-This is a manual test for verifying Kubernetes OIDC authentication with your OIDC provider.
-
-
-## Purpose
-
-This test checks the following points:
-
-1. You can set up your OIDC provider using [setup guide](../docs/setup.md).
-1. The plugin works with your OIDC provider.
-
-
-## Getting Started
-
-### Prerequisite
-
-You need to build the plugin into the parent directory.
-
-```sh
-make -C ..
-```
-
-You need to set up your provider.
-See [setup guide](../docs/setup.md) for more.
-
-You need to install the following tools:
-
- Docker
- Kind
- kubectl
-
-You can check if the tools are available.
-
-```sh
-make check
-```
-
-### 1. Create a cluster
-
-Create a cluster.
-For example, you can create a cluster with Google account authentication.
-
-```sh
-make OIDC_ISSUER_URL=https://accounts.google.com \
-  OIDC_CLIENT_ID=REDACTED.apps.googleusercontent.com \
-  OIDC_CLIENT_SECRET=REDACTED \
-  YOUR_EMAIL=REDACTED@gmail.com
-```
-
-It will do the following steps:
-
-1. Create a cluster.
-1. Set up access control. It allows read-only access from your email address.
-1. Set up kubectl to enable the plugin.
-
-You can change kubectl configuration in generated `output/kubeconfig.yaml`.
-
-### 2. Run kubectl
-
-Make sure you can log in to the provider and access the cluster.
-
-```console
-% export KUBECONFIG=$PWD/output/kubeconfig.yaml
-% kubectl get pods -A
-```
-
-### Clean up
-
-To delete the cluster and generated files:
-
-```sh
-make delete-cluster
-make clean
-```
--- a/acceptance_test/cluster.yaml
+++ b/acceptance_test/cluster.yaml
@@ -1,13 +0,0 @@
-kind: Cluster
-apiVersion: kind.x-k8s.io/v1alpha4
-kubeadmConfigPatches:
-  - |
-    apiVersion: kubeadm.k8s.io/v1beta2
-    kind: ClusterConfiguration
-    metadata:
-      name: config
-    apiServer:
-      extraArgs:
-        oidc-issuer-url: OIDC_ISSUER_URL
-        oidc-client-id: OIDC_CLIENT_ID
-        oidc-username-claim: email
--- a/adaptors/cmd.go
+++ b/adaptors/cmd.go
@@ -0,0 +1,75 @@
+package adaptors
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/int128/kubelogin/adaptors/interfaces"
+	"github.com/int128/kubelogin/usecases/interfaces"
+	"github.com/jessevdk/go-flags"
+	"github.com/mitchellh/go-homedir"
+	"github.com/pkg/errors"
+	"go.uber.org/dig"
+)
+
+func NewCmd(i Cmd) adaptors.Cmd {
+	return &i
+}
+
+type Cmd struct {
+	dig.In
+	Login  usecases.Login
+	Logger adaptors.Logger
+}
+
+func (cmd *Cmd) Run(ctx context.Context, args []string, version string) int {
+	var o cmdOptions
+	parser := flags.NewParser(&o, flags.HelpFlag)
+	parser.LongDescription = fmt.Sprintf(`Version %s
+		This updates the kubeconfig for Kubernetes OpenID Connect (OIDC) authentication.`,
+		version)
+	args, err := parser.ParseArgs(args[1:])
+	if err != nil {
+		cmd.Logger.Printf("Error: %s", err)
+		return 1
+	}
+	if len(args) > 0 {
+		cmd.Logger.Printf("Error: too many arguments")
+		return 1
+	}
+	cmd.Logger.SetLevel(adaptors.LogLevel(o.Verbose))
+	kubeConfig, err := o.ExpandKubeConfig()
+	if err != nil {
+		cmd.Logger.Printf("Error: invalid option: %s", err)
+		return 1
+	}
+
+	in := usecases.LoginIn{
+		KubeConfig:      kubeConfig,
+		ListenPort:      o.ListenPort,
+		SkipTLSVerify:   o.SkipTLSVerify,
+		SkipOpenBrowser: o.SkipOpenBrowser,
+	}
+	if err := cmd.Login.Do(ctx, in); err != nil {
+		cmd.Logger.Printf("Error: %s", err)
+		return 1
+	}
+	return 0
+}
+
+type cmdOptions struct {
+	KubeConfig      string `long:"kubeconfig" default:"~/.kube/config" env:"KUBECONFIG" description:"Path to the kubeconfig file"`
+	ListenPort      int    `long:"listen-port" default:"8000" env:"KUBELOGIN_LISTEN_PORT" description:"Port used by kubelogin to bind its webserver"`
+	SkipTLSVerify   bool   `long:"insecure-skip-tls-verify" env:"KUBELOGIN_INSECURE_SKIP_TLS_VERIFY" description:"If set, the server's certificate will not be checked for validity. This will make your HTTPS connections insecure"`
+	SkipOpenBrowser bool   `long:"skip-open-browser" env:"KUBELOGIN_SKIP_OPEN_BROWSER" description:"If set, it does not open the browser on authentication."`
+	Verbose         int    `long:"v" short:"v" default:"0" description:"If set to 1 or greater, show debug log"`
+}
+
+// ExpandKubeConfig returns an expanded KubeConfig path.
+func (c *cmdOptions) ExpandKubeConfig() (string, error) {
+	d, err := homedir.Expand(c.KubeConfig)
+	if err != nil {
+		return "", errors.Wrapf(err, "could not expand %s", c.KubeConfig)
+	}
+	return d, nil
+}
--- a/adaptors/cmd_test.go
+++ b/adaptors/cmd_test.go
@@ -0,0 +1,98 @@
+package adaptors
+
+import (
+	"context"
+	"testing"
+
+	"github.com/golang/mock/gomock"
+	"github.com/int128/kubelogin/adaptors/interfaces"
+	"github.com/int128/kubelogin/adaptors/mock_adaptors"
+	"github.com/int128/kubelogin/usecases/interfaces"
+	"github.com/int128/kubelogin/usecases/mock_usecases"
+	"github.com/mitchellh/go-homedir"
+)
+
+func TestCmd_Run(t *testing.T) {
+	const executable = "kubelogin"
+	const version = "HEAD"
+
+	t.Run("Defaults", func(t *testing.T) {
+		ctrl := gomock.NewController(t)
+		defer ctrl.Finish()
+		ctx := context.TODO()
+
+		login := mock_usecases.NewMockLogin(ctrl)
+		login.EXPECT().
+			Do(ctx, usecases.LoginIn{
+				KubeConfig: expand(t, "~/.kube/config"),
+				ListenPort: 8000,
+			})
+
+		logger := mock_adaptors.NewLogger(t, ctrl)
+		logger.EXPECT().
+			SetLevel(adaptors.LogLevel(0))
+
+		cmd := Cmd{
+			Login:  login,
+			Logger: logger,
+		}
+		exitCode := cmd.Run(ctx, []string{executable}, version)
+		if exitCode != 0 {
+			t.Errorf("exitCode wants 0 but %d", exitCode)
+		}
+	})
+
+	t.Run("FullOptions", func(t *testing.T) {
+		ctrl := gomock.NewController(t)
+		defer ctrl.Finish()
+		ctx := context.TODO()
+
+		login := mock_usecases.NewMockLogin(ctrl)
+		login.EXPECT().
+			Do(ctx, usecases.LoginIn{
+				KubeConfig:      expand(t, "~/.kube/config"),
+				ListenPort:      10080,
+				SkipTLSVerify:   true,
+				SkipOpenBrowser: true,
+			})
+
+		logger := mock_adaptors.NewLogger(t, ctrl)
+		logger.EXPECT().
+			SetLevel(adaptors.LogLevel(1))
+
+		cmd := Cmd{
+			Login:  login,
+			Logger: logger,
+		}
+		exitCode := cmd.Run(ctx, []string{executable,
+			"--listen-port", "10080",
+			"--insecure-skip-tls-verify",
+			"--skip-open-browser",
+			"-v1",
+		}, version)
+		if exitCode != 0 {
+			t.Errorf("exitCode wants 0 but %d", exitCode)
+		}
+	})
+
+	t.Run("TooManyArgs", func(t *testing.T) {
+		ctrl := gomock.NewController(t)
+		defer ctrl.Finish()
+		cmd := Cmd{
+			Login:  mock_usecases.NewMockLogin(ctrl),
+			Logger: mock_adaptors.NewLogger(t, ctrl),
+		}
+		exitCode := cmd.Run(context.TODO(), []string{executable, "some"}, version)
+		if exitCode != 1 {
+			t.Errorf("exitCode wants 1 but %d", exitCode)
+		}
+	})
+}
+
+func expand(t *testing.T, path string) string {
+	d, err := homedir.Expand(path)
+	if err != nil {
+		t.Fatalf("could not expand: %s", err)
+	}
+	return d
+}
--- a/adaptors/http.go
+++ b/adaptors/http.go
@@ -0,0 +1,82 @@
+package adaptors
+
+import (
+	"crypto/tls"
+	"crypto/x509"
+	"encoding/base64"
+	"io/ioutil"
+	"net/http"
+
+	"github.com/int128/kubelogin/adaptors/interfaces"
+	"github.com/int128/kubelogin/infrastructure"
+	"github.com/pkg/errors"
+	"go.uber.org/dig"
+)
+
+func NewHTTP(i HTTP) adaptors.HTTP {
+	return &i
+}
+
+type HTTP struct {
+	dig.In
+	Logger adaptors.Logger
+}
+
+func (*HTTP) NewClientConfig() adaptors.HTTPClientConfig {
+	return &httpClientConfig{
+		certPool: x509.NewCertPool(),
+	}
+}
+
+func (h *HTTP) NewClient(config adaptors.HTTPClientConfig) (*http.Client, error) {
+	return &http.Client{
+		Transport: &infrastructure.LoggingTransport{
+			Base: &http.Transport{
+				TLSClientConfig: config.TLSConfig(),
+				Proxy:           http.ProxyFromEnvironment,
+			},
+			Logger: h.Logger,
+		},
+	}, nil
+}
+
+type httpClientConfig struct {
+	certPool      *x509.CertPool
+	skipTLSVerify bool
+}
+
+func (c *httpClientConfig) AddCertificateFromFile(filename string) error {
+	b, err := ioutil.ReadFile(filename)
+	if err != nil {
+		return errors.Wrapf(err, "could not read %s", filename)
+	}
+	if c.certPool.AppendCertsFromPEM(b) != true {
+		return errors.Errorf("could not append certificate from %s", filename)
+	}
+	return nil
+}
+
+func (c *httpClientConfig) AddEncodedCertificate(base64String string) error {
+	b, err := base64.StdEncoding.DecodeString(base64String)
+	if err != nil {
+		return errors.Wrapf(err, "could not decode base64")
+	}
+	if c.certPool.AppendCertsFromPEM(b) != true {
+		return errors.Errorf("could not append certificate")
+	}
+	return nil
+}
+
+func (c *httpClientConfig) TLSConfig() *tls.Config {
+	tlsConfig := &tls.Config{
+		InsecureSkipVerify: c.skipTLSVerify,
+	}
+	if len(c.certPool.Subjects()) > 0 {
+		tlsConfig.RootCAs = c.certPool
+	}
+	return tlsConfig
+}
+
+func (c *httpClientConfig) SetSkipTLSVerify(b bool) {
+	c.skipTLSVerify = b
+}
--- a/adaptors/interfaces/adaptors.go
+++ b/adaptors/interfaces/adaptors.go
@@ -0,0 +1,82 @@
+package adaptors
+
+import (
+	"context"
+	"crypto/tls"
+	"net/http"
+
+	"github.com/coreos/go-oidc"
+	"k8s.io/client-go/tools/clientcmd/api"
+)
+
+//go:generate mockgen -package mock_adaptors -destination ../mock_adaptors/mock_adaptors.go github.com/int128/kubelogin/adaptors/interfaces KubeConfig,HTTP,HTTPClientConfig,OIDC,Logger
+
+type Cmd interface {
+	Run(ctx context.Context, args []string, version string) int
+}
+
+type KubeConfig interface {
+	LoadFromFile(filename string) (*api.Config, error)
+	WriteToFile(config *api.Config, filename string) error
+}
+
+type HTTP interface {
+	NewClientConfig() HTTPClientConfig
+	NewClient(config HTTPClientConfig) (*http.Client, error)
+}
+
+type HTTPClientConfig interface {
+	AddCertificateFromFile(filename string) error
+	AddEncodedCertificate(base64String string) error
+	SetSkipTLSVerify(b bool)
+
+	TLSConfig() *tls.Config
+}
+
+type OIDC interface {
+	Authenticate(ctx context.Context, in OIDCAuthenticateIn, cb OIDCAuthenticateCallback) (*OIDCAuthenticateOut, error)
+	VerifyIDToken(ctx context.Context, in OIDCVerifyTokenIn) (*oidc.IDToken, error)
+}
+
+type OIDCAuthenticateIn struct {
+	Issuer          string
+	ClientID        string
+	ClientSecret    string
+	ExtraScopes     []string     // Additional scopes
+	Client          *http.Client // HTTP client for oidc and oauth2
+	LocalServerPort int          // HTTP server port
+	SkipOpenBrowser bool         // skip opening browser if true
+}
+
+type OIDCAuthenticateCallback struct {
+	ShowLocalServerURL func(url string)
+}
+
+type OIDCAuthenticateOut struct {
+	VerifiedIDToken *oidc.IDToken
+	IDToken         string
+	RefreshToken    string
+}
+
+type OIDCVerifyTokenIn struct {
+	IDToken  string
+	Issuer   string
+	ClientID string
+	Client   *http.Client
+}
+
+type Logger interface {
+	Printf(format string, v ...interface{})
+	Debugf(level LogLevel, format string, v ...interface{})
+	SetLevel(level LogLevel)
+	IsEnabled(level LogLevel) bool
+}
+
+// LogLevel represents a log level for debug.
+//
+// 0 = None
+// 1 = Including in/out
+// 2 = Including transport headers
+// 3 = Including transport body
+//
+type LogLevel int
--- a/adaptors/kubeconfig.go
+++ b/adaptors/kubeconfig.go
@@ -0,0 +1,30 @@
+package adaptors
+
+import (
+	"github.com/int128/kubelogin/adaptors/interfaces"
+	"github.com/pkg/errors"
+	"k8s.io/client-go/tools/clientcmd"
+	"k8s.io/client-go/tools/clientcmd/api"
+)
+
+func NewKubeConfig() adaptors.KubeConfig {
+	return &KubeConfig{}
+}
+
+type KubeConfig struct{}
+
+func (*KubeConfig) LoadFromFile(filename string) (*api.Config, error) {
+	config, err := clientcmd.LoadFromFile(filename)
+	if err != nil {
+		return nil, errors.Wrapf(err, "could not read the kubeconfig from %s", filename)
+	}
+	return config, err
+}
+
+func (*KubeConfig) WriteToFile(config *api.Config, filename string) error {
+	err := clientcmd.WriteToFile(*config, filename)
+	if err != nil {
+		return errors.Wrapf(err, "could not write the kubeconfig to %s", filename)
+	}
+	return err
+}
--- a/adaptors/logger.go
+++ b/adaptors/logger.go
@@ -0,0 +1,49 @@
+package adaptors
+
+import (
+	"log"
+	"os"
+
+	"github.com/int128/kubelogin/adaptors/interfaces"
+)
+
+// NewLogger returns a Logger with the standard log.Logger for messages and debug.
+func NewLogger() adaptors.Logger {
+	return &Logger{
+		stdLogger:   log.New(os.Stderr, "", 0),
+		debugLogger: log.New(os.Stderr, "", log.Ltime|log.Lmicroseconds),
+	}
+}
+
+// NewLoggerWith returns a Logger with the given standard log.Logger.
+func NewLoggerWith(l stdLogger) *Logger {
+	return &Logger{
+		stdLogger:   l,
+		debugLogger: l,
+	}
+}
+
+type stdLogger interface {
+	Printf(format string, v ...interface{})
+}
+
+// Logger wraps the standard log.Logger and just provides debug level.
+type Logger struct {
+	stdLogger
+	debugLogger stdLogger
+	level       adaptors.LogLevel
+}
+
+func (l *Logger) Debugf(level adaptors.LogLevel, format string, v ...interface{}) {
+	if l.IsEnabled(level) {
+		l.debugLogger.Printf(format, v...)
+	}
+}
+
+func (l *Logger) SetLevel(level adaptors.LogLevel) {
+	l.level = level
+}
+
+func (l *Logger) IsEnabled(level adaptors.LogLevel) bool {
+	return level <= l.level
+}
--- a/adaptors/logger_test.go
+++ b/adaptors/logger_test.go
@@ -0,0 +1,53 @@
+package adaptors
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/int128/kubelogin/adaptors/interfaces"
+)
+
+type mockStdLogger struct {
+	count int
+}
+
+func (l *mockStdLogger) Printf(format string, v ...interface{}) {
+	l.count++
+}
+
+func TestLogger_Debugf(t *testing.T) {
+	for _, c := range []struct {
+		loggerLevel adaptors.LogLevel
+		debugfLevel adaptors.LogLevel
+		count       int
+	}{
+		{0, 0, 1},
+		{0, 1, 0},
+
+		{1, 0, 1},
+		{1, 1, 1},
+		{1, 2, 0},
+
+		{2, 1, 1},
+		{2, 2, 1},
+		{2, 3, 0},
+	} {
+		t.Run(fmt.Sprintf("%+v", c), func(t *testing.T) {
+			m := &mockStdLogger{}
+			l := &Logger{debugLogger: m, level: c.loggerLevel}
+			l.Debugf(c.debugfLevel, "hello")
+			if m.count != c.count {
+				t.Errorf("count wants %d but %d", c.count, m.count)
+			}
+		})
+	}
+}
+
+func TestLogger_Printf(t *testing.T) {
+	m := &mockStdLogger{}
+	l := &Logger{stdLogger: m}
+	l.Printf("hello")
+	if m.count != 1 {
+		t.Errorf("count wants %d but %d", 1, m.count)
+	}
+}
--- a/adaptors/mock_adaptors/logger.go
+++ b/adaptors/mock_adaptors/logger.go
@@ -0,0 +1,31 @@
+package mock_adaptors
+
+import (
+	"github.com/golang/mock/gomock"
+	"github.com/int128/kubelogin/adaptors/interfaces"
+)
+
+func NewLogger(t testingLogger, ctrl *gomock.Controller) *Logger {
+	return &Logger{
+		MockLogger:    NewMockLogger(ctrl),
+		testingLogger: t,
+	}
+}
+
+type testingLogger interface {
+	Logf(format string, v ...interface{})
+}
+
+// Logger provides mock feature but overrides output methods with actual logging.
+type Logger struct {
+	*MockLogger
+	testingLogger testingLogger
+}
+
+func (l *Logger) Printf(format string, v ...interface{}) {
+	l.testingLogger.Logf(format, v...)
+}
+
+func (l *Logger) Debugf(level adaptors.LogLevel, format string, v ...interface{}) {
+	l.testingLogger.Logf(format, v...)
+}
--- a/adaptors/mock_adaptors/mock_adaptors.go
+++ b/adaptors/mock_adaptors/mock_adaptors.go
@@ -0,0 +1,305 @@
+// Code generated by MockGen. DO NOT EDIT.
+// Source: github.com/int128/kubelogin/adaptors/interfaces (interfaces: KubeConfig,HTTP,HTTPClientConfig,OIDC,Logger)
+
+// Package mock_adaptors is a generated GoMock package.
+package mock_adaptors
+
+import (
+	context "context"
+	tls "crypto/tls"
+	go_oidc "github.com/coreos/go-oidc"
+	gomock "github.com/golang/mock/gomock"
+	interfaces "github.com/int128/kubelogin/adaptors/interfaces"
+	api "k8s.io/client-go/tools/clientcmd/api"
+	http "net/http"
+	reflect "reflect"
+)
+
+// MockKubeConfig is a mock of KubeConfig interface
+type MockKubeConfig struct {
+	ctrl     *gomock.Controller
+	recorder *MockKubeConfigMockRecorder
+}
+
+// MockKubeConfigMockRecorder is the mock recorder for MockKubeConfig
+type MockKubeConfigMockRecorder struct {
+	mock *MockKubeConfig
+}
+
+// NewMockKubeConfig creates a new mock instance
+func NewMockKubeConfig(ctrl *gomock.Controller) *MockKubeConfig {
+	mock := &MockKubeConfig{ctrl: ctrl}
+	mock.recorder = &MockKubeConfigMockRecorder{mock}
+	return mock
+}
+
+// EXPECT returns an object that allows the caller to indicate expected use
+func (m *MockKubeConfig) EXPECT() *MockKubeConfigMockRecorder {
+	return m.recorder
+}
+
+// LoadFromFile mocks base method
+func (m *MockKubeConfig) LoadFromFile(arg0 string) (*api.Config, error) {
+	ret := m.ctrl.Call(m, "LoadFromFile", arg0)
+	ret0, _ := ret[0].(*api.Config)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// LoadFromFile indicates an expected call of LoadFromFile
+func (mr *MockKubeConfigMockRecorder) LoadFromFile(arg0 interface{}) *gomock.Call {
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "LoadFromFile", reflect.TypeOf((*MockKubeConfig)(nil).LoadFromFile), arg0)
+}
+
+// WriteToFile mocks base method
+func (m *MockKubeConfig) WriteToFile(arg0 *api.Config, arg1 string) error {
+	ret := m.ctrl.Call(m, "WriteToFile", arg0, arg1)
+	ret0, _ := ret[0].(error)
+	return ret0
+}
+
+// WriteToFile indicates an expected call of WriteToFile
+func (mr *MockKubeConfigMockRecorder) WriteToFile(arg0, arg1 interface{}) *gomock.Call {
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "WriteToFile", reflect.TypeOf((*MockKubeConfig)(nil).WriteToFile), arg0, arg1)
+}
+
+// MockHTTP is a mock of HTTP interface
+type MockHTTP struct {
+	ctrl     *gomock.Controller
+	recorder *MockHTTPMockRecorder
+}
+
+// MockHTTPMockRecorder is the mock recorder for MockHTTP
+type MockHTTPMockRecorder struct {
+	mock *MockHTTP
+}
+
+// NewMockHTTP creates a new mock instance
+func NewMockHTTP(ctrl *gomock.Controller) *MockHTTP {
+	mock := &MockHTTP{ctrl: ctrl}
+	mock.recorder = &MockHTTPMockRecorder{mock}
+	return mock
+}
+
+// EXPECT returns an object that allows the caller to indicate expected use
+func (m *MockHTTP) EXPECT() *MockHTTPMockRecorder {
+	return m.recorder
+}
+
+// NewClient mocks base method
+func (m *MockHTTP) NewClient(arg0 interfaces.HTTPClientConfig) (*http.Client, error) {
+	ret := m.ctrl.Call(m, "NewClient", arg0)
+	ret0, _ := ret[0].(*http.Client)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// NewClient indicates an expected call of NewClient
+func (mr *MockHTTPMockRecorder) NewClient(arg0 interface{}) *gomock.Call {
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "NewClient", reflect.TypeOf((*MockHTTP)(nil).NewClient), arg0)
+}
+
+// NewClientConfig mocks base method
+func (m *MockHTTP) NewClientConfig() interfaces.HTTPClientConfig {
+	ret := m.ctrl.Call(m, "NewClientConfig")
+	ret0, _ := ret[0].(interfaces.HTTPClientConfig)
+	return ret0
+}
+
+// NewClientConfig indicates an expected call of NewClientConfig
+func (mr *MockHTTPMockRecorder) NewClientConfig() *gomock.Call {
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "NewClientConfig", reflect.TypeOf((*MockHTTP)(nil).NewClientConfig))
+}
+
+// MockHTTPClientConfig is a mock of HTTPClientConfig interface
+type MockHTTPClientConfig struct {
+	ctrl     *gomock.Controller
+	recorder *MockHTTPClientConfigMockRecorder
+}
+
+// MockHTTPClientConfigMockRecorder is the mock recorder for MockHTTPClientConfig
+type MockHTTPClientConfigMockRecorder struct {
+	mock *MockHTTPClientConfig
+}
+
+// NewMockHTTPClientConfig creates a new mock instance
+func NewMockHTTPClientConfig(ctrl *gomock.Controller) *MockHTTPClientConfig {
+	mock := &MockHTTPClientConfig{ctrl: ctrl}
+	mock.recorder = &MockHTTPClientConfigMockRecorder{mock}
+	return mock
+}
+
+// EXPECT returns an object that allows the caller to indicate expected use
+func (m *MockHTTPClientConfig) EXPECT() *MockHTTPClientConfigMockRecorder {
+	return m.recorder
+}
+
+// AddCertificateFromFile mocks base method
+func (m *MockHTTPClientConfig) AddCertificateFromFile(arg0 string) error {
+	ret := m.ctrl.Call(m, "AddCertificateFromFile", arg0)
+	ret0, _ := ret[0].(error)
+	return ret0
+}
+
+// AddCertificateFromFile indicates an expected call of AddCertificateFromFile
+func (mr *MockHTTPClientConfigMockRecorder) AddCertificateFromFile(arg0 interface{}) *gomock.Call {
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "AddCertificateFromFile", reflect.TypeOf((*MockHTTPClientConfig)(nil).AddCertificateFromFile), arg0)
+}
+
+// AddEncodedCertificate mocks base method
+func (m *MockHTTPClientConfig) AddEncodedCertificate(arg0 string) error {
+	ret := m.ctrl.Call(m, "AddEncodedCertificate", arg0)
+	ret0, _ := ret[0].(error)
+	return ret0
+}
+
+// AddEncodedCertificate indicates an expected call of AddEncodedCertificate
+func (mr *MockHTTPClientConfigMockRecorder) AddEncodedCertificate(arg0 interface{}) *gomock.Call {
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "AddEncodedCertificate", reflect.TypeOf((*MockHTTPClientConfig)(nil).AddEncodedCertificate), arg0)
+}
+
+// SetSkipTLSVerify mocks base method
+func (m *MockHTTPClientConfig) SetSkipTLSVerify(arg0 bool) {
+	m.ctrl.Call(m, "SetSkipTLSVerify", arg0)
+}
+
+// SetSkipTLSVerify indicates an expected call of SetSkipTLSVerify
+func (mr *MockHTTPClientConfigMockRecorder) SetSkipTLSVerify(arg0 interface{}) *gomock.Call {
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "SetSkipTLSVerify", reflect.TypeOf((*MockHTTPClientConfig)(nil).SetSkipTLSVerify), arg0)
+}
+
+// TLSConfig mocks base method
+func (m *MockHTTPClientConfig) TLSConfig() *tls.Config {
+	ret := m.ctrl.Call(m, "TLSConfig")
+	ret0, _ := ret[0].(*tls.Config)
+	return ret0
+}
+
+// TLSConfig indicates an expected call of TLSConfig
+func (mr *MockHTTPClientConfigMockRecorder) TLSConfig() *gomock.Call {
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "TLSConfig", reflect.TypeOf((*MockHTTPClientConfig)(nil).TLSConfig))
+}
+
+// MockOIDC is a mock of OIDC interface
+type MockOIDC struct {
+	ctrl     *gomock.Controller
+	recorder *MockOIDCMockRecorder
+}
+
+// MockOIDCMockRecorder is the mock recorder for MockOIDC
+type MockOIDCMockRecorder struct {
+	mock *MockOIDC
+}
+
+// NewMockOIDC creates a new mock instance
+func NewMockOIDC(ctrl *gomock.Controller) *MockOIDC {
+	mock := &MockOIDC{ctrl: ctrl}
+	mock.recorder = &MockOIDCMockRecorder{mock}
+	return mock
+}
+
+// EXPECT returns an object that allows the caller to indicate expected use
+func (m *MockOIDC) EXPECT() *MockOIDCMockRecorder {
+	return m.recorder
+}
+
+// Authenticate mocks base method
+func (m *MockOIDC) Authenticate(arg0 context.Context, arg1 interfaces.OIDCAuthenticateIn, arg2 interfaces.OIDCAuthenticateCallback) (*interfaces.OIDCAuthenticateOut, error) {
+	ret := m.ctrl.Call(m, "Authenticate", arg0, arg1, arg2)
+	ret0, _ := ret[0].(*interfaces.OIDCAuthenticateOut)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// Authenticate indicates an expected call of Authenticate
+func (mr *MockOIDCMockRecorder) Authenticate(arg0, arg1, arg2 interface{}) *gomock.Call {
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Authenticate", reflect.TypeOf((*MockOIDC)(nil).Authenticate), arg0, arg1, arg2)
+}
+
+// VerifyIDToken mocks base method
+func (m *MockOIDC) VerifyIDToken(arg0 context.Context, arg1 interfaces.OIDCVerifyTokenIn) (*go_oidc.IDToken, error) {
+	ret := m.ctrl.Call(m, "VerifyIDToken", arg0, arg1)
+	ret0, _ := ret[0].(*go_oidc.IDToken)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// VerifyIDToken indicates an expected call of VerifyIDToken
+func (mr *MockOIDCMockRecorder) VerifyIDToken(arg0, arg1 interface{}) *gomock.Call {
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "VerifyIDToken", reflect.TypeOf((*MockOIDC)(nil).VerifyIDToken), arg0, arg1)
+}
+
+// MockLogger is a mock of Logger interface
+type MockLogger struct {
+	ctrl     *gomock.Controller
+	recorder *MockLoggerMockRecorder
+}
+
+// MockLoggerMockRecorder is the mock recorder for MockLogger
+type MockLoggerMockRecorder struct {
+	mock *MockLogger
+}
+
+// NewMockLogger creates a new mock instance
+func NewMockLogger(ctrl *gomock.Controller) *MockLogger {
+	mock := &MockLogger{ctrl: ctrl}
+	mock.recorder = &MockLoggerMockRecorder{mock}
+	return mock
+}
+
+// EXPECT returns an object that allows the caller to indicate expected use
+func (m *MockLogger) EXPECT() *MockLoggerMockRecorder {
+	return m.recorder
+}
+
+// Debugf mocks base method
+func (m *MockLogger) Debugf(arg0 interfaces.LogLevel, arg1 string, arg2 ...interface{}) {
+	varargs := []interface{}{arg0, arg1}
+	for _, a := range arg2 {
+		varargs = append(varargs, a)
+	}
+	m.ctrl.Call(m, "Debugf", varargs...)
+}
+
+// Debugf indicates an expected call of Debugf
+func (mr *MockLoggerMockRecorder) Debugf(arg0, arg1 interface{}, arg2 ...interface{}) *gomock.Call {
+	varargs := append([]interface{}{arg0, arg1}, arg2...)
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Debugf", reflect.TypeOf((*MockLogger)(nil).Debugf), varargs...)
+}
+
+// IsEnabled mocks base method
+func (m *MockLogger) IsEnabled(arg0 interfaces.LogLevel) bool {
+	ret := m.ctrl.Call(m, "IsEnabled", arg0)
+	ret0, _ := ret[0].(bool)
+	return ret0
+}
+
+// IsEnabled indicates an expected call of IsEnabled
+func (mr *MockLoggerMockRecorder) IsEnabled(arg0 interface{}) *gomock.Call {
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "IsEnabled", reflect.TypeOf((*MockLogger)(nil).IsEnabled), arg0)
+}
+
+// Printf mocks base method
+func (m *MockLogger) Printf(arg0 string, arg1 ...interface{}) {
+	varargs := []interface{}{arg0}
+	for _, a := range arg1 {
+		varargs = append(varargs, a)
+	}
+	m.ctrl.Call(m, "Printf", varargs...)
+}
+
+// Printf indicates an expected call of Printf
+func (mr *MockLoggerMockRecorder) Printf(arg0 interface{}, arg1 ...interface{}) *gomock.Call {
+	varargs := append([]interface{}{arg0}, arg1...)
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Printf", reflect.TypeOf((*MockLogger)(nil).Printf), varargs...)
+}
+
+// SetLevel mocks base method
+func (m *MockLogger) SetLevel(arg0 interfaces.LogLevel) {
+	m.ctrl.Call(m, "SetLevel", arg0)
+}
+
+// SetLevel indicates an expected call of SetLevel
+func (mr *MockLoggerMockRecorder) SetLevel(arg0 interface{}) *gomock.Call {
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "SetLevel", reflect.TypeOf((*MockLogger)(nil).SetLevel), arg0)
+}
--- a/adaptors/oidc.go
+++ b/adaptors/oidc.go
@@ -0,0 +1,73 @@
+package adaptors
+
+import (
+	"context"
+
+	"github.com/coreos/go-oidc"
+	"github.com/int128/kubelogin/adaptors/interfaces"
+	"github.com/int128/oauth2cli"
+	"github.com/pkg/errors"
+	"golang.org/x/oauth2"
+)
+
+func NewOIDC() adaptors.OIDC {
+	return &OIDC{}
+}
+
+type OIDC struct{}
+
+func (*OIDC) Authenticate(ctx context.Context, in adaptors.OIDCAuthenticateIn, cb adaptors.OIDCAuthenticateCallback) (*adaptors.OIDCAuthenticateOut, error) {
+	if in.Client != nil {
+		ctx = context.WithValue(ctx, oauth2.HTTPClient, in.Client)
+	}
+	provider, err := oidc.NewProvider(ctx, in.Issuer)
+	if err != nil {
+		return nil, errors.Wrapf(err, "could not discovery the OIDC issuer")
+	}
+	flow := oauth2cli.AuthCodeFlow{
+		Config: oauth2.Config{
+			Endpoint:     provider.Endpoint(),
+			ClientID:     in.ClientID,
+			ClientSecret: in.ClientSecret,
+			Scopes:       append(in.ExtraScopes, oidc.ScopeOpenID),
+		},
+		LocalServerPort:    in.LocalServerPort,
+		SkipOpenBrowser:    in.SkipOpenBrowser,
+		AuthCodeOptions:    []oauth2.AuthCodeOption{oauth2.AccessTypeOffline},
+		ShowLocalServerURL: cb.ShowLocalServerURL,
+	}
+	token, err := flow.GetToken(ctx)
+	if err != nil {
+		return nil, errors.Wrapf(err, "could not get a token")
+	}
+	idToken, ok := token.Extra("id_token").(string)
+	if !ok {
+		return nil, errors.Errorf("id_token is missing in the token response: %s", token)
+	}
+	verifier := provider.Verifier(&oidc.Config{ClientID: in.ClientID})
+	verifiedIDToken, err := verifier.Verify(ctx, idToken)
+	if err != nil {
+		return nil, errors.Wrapf(err, "could not verify the id_token")
+	}
+	return &adaptors.OIDCAuthenticateOut{
+		VerifiedIDToken: verifiedIDToken,
+		IDToken:         idToken,
+		RefreshToken:    token.RefreshToken,
+	}, nil
+}
+
+func (*OIDC) VerifyIDToken(ctx context.Context, in adaptors.OIDCVerifyTokenIn) (*oidc.IDToken, error) {
+	if in.Client != nil {
+		ctx = context.WithValue(ctx, oauth2.HTTPClient, in.Client)
+	}
+	provider, err := oidc.NewProvider(ctx, in.Issuer)
+	if err != nil {
+		return nil, errors.Wrapf(err, "could not discovery the OIDC issuer")
+	}
+	verifier := provider.Verifier(&oidc.Config{ClientID: in.ClientID})
+	verifiedIDToken, err := verifier.Verify(ctx, in.IDToken)
+	if err != nil {
+		return nil, errors.Wrapf(err, "could not verify the id_token")
+	}
+	return verifiedIDToken, nil
+}
--- a/adaptors_test/authserver/authserver.go
+++ b/adaptors_test/authserver/authserver.go
@@ -0,0 +1,38 @@
+package authserver
+
+import (
+	"crypto/rsa"
+	"net/http"
+	"testing"
+)
+
+// Config represents server configuration.
+type Config struct {
+	Issuer         string
+	Scope          string
+	TLSServerCert  string
+	TLSServerKey   string
+	IDToken        string
+	RefreshToken   string
+	IDTokenKeyPair *rsa.PrivateKey
+}
+
+// Start starts a HTTP server.
+func Start(t *testing.T, c Config) *http.Server {
+	s := &http.Server{
+		Addr:    "localhost:9000",
+		Handler: newHandler(t, c),
+	}
+	go func() {
+		var err error
+		if c.TLSServerCert != "" && c.TLSServerKey != "" {
+			err = s.ListenAndServeTLS(c.TLSServerCert, c.TLSServerKey)
+		} else {
+			err = s.ListenAndServe()
+		}
+		if err != nil && err != http.ErrServerClosed {
+			t.Error(err)
+		}
+	}()
+	return s
+}
--- a/adaptors_test/authserver/handler.go
+++ b/adaptors_test/authserver/handler.go
@@ -0,0 +1,108 @@
+package authserver
+
+import (
+	"encoding/base64"
+	"fmt"
+	"math/big"
+	"net/http"
+	"testing"
+	"text/template"
+
+	"github.com/pkg/errors"
+)
+
+type handler struct {
+	t *testing.T
+
+	discovery *template.Template
+	token     *template.Template
+	jwks      *template.Template
+	authCode  string
+
+	// Template values
+	Issuer       string
+	Scope        string // Default to openid
+	IDToken      string
+	RefreshToken string
+	PrivateKey   struct{ N, E string }
+}
+
+func newHandler(t *testing.T, c Config) *handler {
+	tpl, err := template.ParseFiles(
+		"authserver/testdata/oidc-discovery.json",
+		"authserver/testdata/oidc-token.json",
+		"authserver/testdata/oidc-jwks.json",
+	)
+	if err != nil {
+		t.Fatalf("could not read the templates: %s", err)
+	}
+	h := handler{
+		t:            t,
+		discovery:    tpl.Lookup("oidc-discovery.json"),
+		token:        tpl.Lookup("oidc-token.json"),
+		jwks:         tpl.Lookup("oidc-jwks.json"),
+		authCode:     "3d24a8bd-35e6-457d-999e-e04bb1dfcec7",
+		Issuer:       c.Issuer,
+		Scope:        c.Scope,
+		IDToken:      c.IDToken,
+		RefreshToken: c.RefreshToken,
+	}
+	if h.Scope == "" {
+		h.Scope = "openid"
+	}
+	if c.IDTokenKeyPair != nil {
+		h.PrivateKey.E = base64.RawURLEncoding.EncodeToString(big.NewInt(int64(c.IDTokenKeyPair.E)).Bytes())
+		h.PrivateKey.N = base64.RawURLEncoding.EncodeToString(c.IDTokenKeyPair.N.Bytes())
+	}
+	return &h
+}
+
+func (h *handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	if err := h.serveHTTP(w, r); err != nil {
+		h.t.Logf("[auth-server] Error: %s", err)
+		w.WriteHeader(500)
+	}
+}
+
+func (h *handler) serveHTTP(w http.ResponseWriter, r *http.Request) error {
+	m := r.Method
+	p := r.URL.Path
+	h.t.Logf("[auth-server] %s %s", m, r.RequestURI)
+	switch {
+	case m == "GET" && p == "/.well-known/openid-configuration":
+		w.Header().Add("Content-Type", "application/json")
+		if err := h.discovery.Execute(w, h); err != nil {
+			return errors.Wrapf(err, "could not execute the template")
+		}
+	case m == "GET" && p == "/protocol/openid-connect/auth":
+		// Authentication Response
+		// http://openid.net/specs/openid-connect-core-1_0.html#AuthResponse
+		q := r.URL.Query()
+		if h.Scope != q.Get("scope") {
+			return errors.Errorf("scope wants %s but %s", h.Scope, q.Get("scope"))
+		}
+		to := fmt.Sprintf("%s?state=%s&code=%s", q.Get("redirect_uri"), q.Get("state"), h.authCode)
+		http.Redirect(w, r, to, 302)
+	case m == "POST" && p == "/protocol/openid-connect/token":
+		// Token Response
+		// http://openid.net/specs/openid-connect-core-1_0.html#TokenResponse
+		if err := r.ParseForm(); err != nil {
+			return errors.Wrapf(err, "could not parse the form")
+		}
+		if h.authCode != r.Form.Get("code") {
+			return errors.Errorf("code wants %s but %s", h.authCode, r.Form.Get("code"))
+		}
+		w.Header().Add("Content-Type", "application/json")
+		if err := h.token.Execute(w, h); err != nil {
+			return errors.Wrapf(err, "could not execute the template")
+		}
+	case m == "GET" && p == "/protocol/openid-connect/certs":
+		w.Header().Add("Content-Type", "application/json")
+		if err := h.jwks.Execute(w, h); err != nil {
+			return errors.Wrapf(err, "could not execute the template")
+		}
+	default:
+		http.Error(w, "Not Found", 404)
+	}
+	return nil
+}
--- a/adaptors_test/authserver/testdata/oidc-discovery.json
+++ b/adaptors_test/authserver/testdata/oidc-discovery.json
@@ -0,0 +1,85 @@
+{
+  "issuer": "{{ .Issuer }}",
+  "authorization_endpoint": "{{ .Issuer }}/protocol/openid-connect/auth",
+  "token_endpoint": "{{ .Issuer }}/protocol/openid-connect/token",
+  "token_introspection_endpoint": "{{ .Issuer }}/protocol/openid-connect/token/introspect",
+  "userinfo_endpoint": "{{ .Issuer }}/protocol/openid-connect/userinfo",
+  "end_session_endpoint": "{{ .Issuer }}/protocol/openid-connect/logout",
+  "jwks_uri": "{{ .Issuer }}/protocol/openid-connect/certs",
+  "check_session_iframe": "{{ .Issuer }}/protocol/openid-connect/login-status-iframe.html",
+  "grant_types_supported": [
+    "authorization_code",
+    "implicit",
+    "refresh_token",
+    "password",
+    "client_credentials"
+  ],
+  "response_types_supported": [
+    "code",
+    "none",
+    "id_token",
+    "token",
+    "id_token token",
+    "code id_token",
+    "code token",
+    "code id_token token"
+  ],
+  "subject_types_supported": [
+    "public",
+    "pairwise"
+  ],
+  "id_token_signing_alg_values_supported": [
+    "RS256"
+  ],
+  "userinfo_signing_alg_values_supported": [
+    "RS256"
+  ],
+  "request_object_signing_alg_values_supported": [
+    "none",
+    "RS256"
+  ],
+  "response_modes_supported": [
+    "query",
+    "fragment",
+    "form_post"
+  ],
+  "registration_endpoint": "{{ .Issuer }}/clients-registrations/openid-connect",
+  "token_endpoint_auth_methods_supported": [
+    "private_key_jwt",
+    "client_secret_basic",
+    "client_secret_post",
+    "client_secret_jwt"
+  ],
+  "token_endpoint_auth_signing_alg_values_supported": [
+    "RS256"
+  ],
+  "claims_supported": [
+    "sub",
+    "iss",
+    "auth_time",
+    "name",
+    "given_name",
+    "family_name",
+    "preferred_username",
+    "email"
+  ],
+  "claim_types_supported": [
+    "normal"
+  ],
+  "claims_parameter_supported": false,
+  "scopes_supported": [
+    "openid",
+    "offline_access",
+    "phone",
+    "address",
+    "email",
+    "profile"
+  ],
+  "request_parameter_supported": true,
+  "request_uri_parameter_supported": true,
+  "code_challenge_methods_supported": [
+    "plain",
+    "S256"
+  ],
+  "tls_client_certificate_bound_access_tokens": true
+}
--- a/adaptors_test/authserver/testdata/oidc-jwks.json
+++ b/adaptors_test/authserver/testdata/oidc-jwks.json
@@ -0,0 +1,12 @@
+{
+  "keys": [
+    {
+      "kty": "RSA",
+      "alg": "RS256",
+      "use": "sig",
+      "kid": "xxx",
+      "n": "{{ .PrivateKey.N }}",
+      "e": "{{ .PrivateKey.E }}"
+    }
+  ]
+}
--- a/adaptors_test/authserver/testdata/oidc-token.json
+++ b/adaptors_test/authserver/testdata/oidc-token.json
@@ -0,0 +1,7 @@
+{
+  "access_token": "7eaae8ab-8f69-45d9-ab7c-73560cd9444d",
+  "token_type": "Bearer",
+  "refresh_token": "{{ .RefreshToken }}",
+  "expires_in": 3600,
+  "id_token": "{{ .IDToken }}"
+}
--- a/adaptors_test/cmd_test.go
+++ b/adaptors_test/cmd_test.go
@@ -0,0 +1,230 @@
+package adaptors_test
+
+import (
+	"context"
+	"crypto/tls"
+	"net/http"
+	"os"
+	"testing"
+	"time"
+
+	"github.com/dgrijalva/jwt-go"
+	"github.com/int128/kubelogin/adaptors/interfaces"
+	"github.com/int128/kubelogin/adaptors_test/authserver"
+	"github.com/int128/kubelogin/adaptors_test/keys"
+	"github.com/int128/kubelogin/adaptors_test/kubeconfig"
+	"github.com/int128/kubelogin/adaptors_test/logger"
+	"github.com/int128/kubelogin/di"
+)
+
+// Run the integration tests.
+//
+// 1. Start the auth server at port 9000.
+// 2. Run the Cmd.
+// 3. Open a request for port 8000.
+// 4. Wait for the Cmd.
+// 5. Shutdown the auth server.
+//
+func TestCmd_Run(t *testing.T) {
+	timeout := 1 * time.Second
+
+	t.Run("NoTLS", func(t *testing.T) {
+		ctx, cancel := context.WithTimeout(context.Background(), timeout)
+		defer cancel()
+
+		idToken := newIDToken(t, "http://localhost:9000")
+		serverConfig := authserver.Config{
+			Issuer:         "http://localhost:9000",
+			IDToken:        idToken,
+			IDTokenKeyPair: keys.JWSKeyPair,
+			RefreshToken:   "REFRESH_TOKEN",
+		}
+		server := authserver.Start(t, serverConfig)
+		defer server.Shutdown(ctx)
+
+		kubeConfigFilename := kubeconfig.Create(t, &kubeconfig.Values{
+			Issuer: "http://localhost:9000",
+		})
+		defer os.Remove(kubeConfigFilename)
+
+		startBrowserRequest(t, ctx, nil)
+		runCmd(t, ctx, "--kubeconfig", kubeConfigFilename, "--skip-open-browser")
+		kubeconfig.Verify(t, kubeConfigFilename, kubeconfig.AuthProviderConfig{
+			IDToken:      idToken,
+			RefreshToken: "REFRESH_TOKEN",
+		})
+	})
+
+	t.Run("ExtraScopes", func(t *testing.T) {
+		ctx, cancel := context.WithTimeout(context.Background(), timeout)
+		defer cancel()
+
+		idToken := newIDToken(t, "http://localhost:9000")
+		serverConfig := authserver.Config{
+			Issuer:         "http://localhost:9000",
+			IDToken:        idToken,
+			IDTokenKeyPair: keys.JWSKeyPair,
+			RefreshToken:   "REFRESH_TOKEN",
+			Scope:          "profile groups openid",
+		}
+		server := authserver.Start(t, serverConfig)
+		defer server.Shutdown(ctx)
+
+		kubeConfigFilename := kubeconfig.Create(t, &kubeconfig.Values{
+			Issuer:      "http://localhost:9000",
+			ExtraScopes: "profile,groups",
+		})
+		defer os.Remove(kubeConfigFilename)
+
+		startBrowserRequest(t, ctx, nil)
+		runCmd(t, ctx, "--kubeconfig", kubeConfigFilename, "--skip-open-browser")
+		kubeconfig.Verify(t, kubeConfigFilename, kubeconfig.AuthProviderConfig{
+			IDToken:      idToken,
+			RefreshToken: "REFRESH_TOKEN",
+		})
+	})
+
+	t.Run("CACert", func(t *testing.T) {
+		ctx, cancel := context.WithTimeout(context.Background(), timeout)
+		defer cancel()
+
+		idToken := newIDToken(t, "https://localhost:9000")
+		serverConfig := authserver.Config{
+			Issuer:         "https://localhost:9000",
+			IDToken:        idToken,
+			IDTokenKeyPair: keys.JWSKeyPair,
+			RefreshToken:   "REFRESH_TOKEN",
+			TLSServerCert:  keys.TLSServerCert,
+			TLSServerKey:   keys.TLSServerKey,
+		}
+		server := authserver.Start(t, serverConfig)
+		defer server.Shutdown(ctx)
+
+		kubeConfigFilename := kubeconfig.Create(t, &kubeconfig.Values{
+			Issuer:                  "https://localhost:9000",
+			IDPCertificateAuthority: keys.TLSCACert,
+		})
+		defer os.Remove(kubeConfigFilename)
+
+		startBrowserRequest(t, ctx, keys.TLSCACertAsConfig)
+		runCmd(t, ctx, "--kubeconfig", kubeConfigFilename, "--skip-open-browser")
+		kubeconfig.Verify(t, kubeConfigFilename, kubeconfig.AuthProviderConfig{
+			IDToken:      idToken,
+			RefreshToken: "REFRESH_TOKEN",
+		})
+	})
+
+	t.Run("CACertData", func(t *testing.T) {
+		ctx, cancel := context.WithTimeout(context.Background(), timeout)
+		defer cancel()
+
+		idToken := newIDToken(t, "https://localhost:9000")
+		serverConfig := authserver.Config{
+			Issuer:         "https://localhost:9000",
+			IDToken:        idToken,
+			IDTokenKeyPair: keys.JWSKeyPair,
+			RefreshToken:   "REFRESH_TOKEN",
+			TLSServerCert:  keys.TLSServerCert,
+			TLSServerKey:   keys.TLSServerKey,
+		}
+		server := authserver.Start(t, serverConfig)
+		defer server.Shutdown(ctx)
+
+		kubeConfigFilename := kubeconfig.Create(t, &kubeconfig.Values{
+			Issuer:                      "https://localhost:9000",
+			IDPCertificateAuthorityData: keys.TLSCACertAsBase64,
+		})
+		defer os.Remove(kubeConfigFilename)
+
+		startBrowserRequest(t, ctx, keys.TLSCACertAsConfig)
+		runCmd(t, ctx, "--kubeconfig", kubeConfigFilename, "--skip-open-browser")
+		kubeconfig.Verify(t, kubeConfigFilename, kubeconfig.AuthProviderConfig{
+			IDToken:      idToken,
+			RefreshToken: "REFRESH_TOKEN",
+		})
+	})
+
+	t.Run("AlreadyHaveValidToken", func(t *testing.T) {
+		ctx, cancel := context.WithTimeout(context.Background(), timeout)
+		defer cancel()
+
+		serverConfig := authserver.Config{
+			Issuer:         "http://localhost:9000",
+			IDTokenKeyPair: keys.JWSKeyPair,
+		}
+		server := authserver.Start(t, serverConfig)
+		defer server.Shutdown(ctx)
+
+		idToken := newIDToken(t, "http://localhost:9000")
+		kubeConfigFilename := kubeconfig.Create(t, &kubeconfig.Values{
+			Issuer:  "http://localhost:9000",
+			IDToken: idToken,
+		})
+		defer os.Remove(kubeConfigFilename)
+
+		runCmd(t, ctx, "--kubeconfig", kubeConfigFilename, "--skip-open-browser")
+		kubeconfig.Verify(t, kubeConfigFilename, kubeconfig.AuthProviderConfig{
+			IDToken: idToken,
+		})
+	})
+}
+
+func newIDToken(t *testing.T, issuer string) string {
+	t.Helper()
+	var claims struct {
+		jwt.StandardClaims
+		Groups []string `json:"groups"`
+	}
+	claims.StandardClaims = jwt.StandardClaims{
+		Issuer:    issuer,
+		Audience:  "kubernetes",
+		ExpiresAt: time.Now().Add(time.Hour).Unix(),
+		Subject:   "SUBJECT",
+		IssuedAt:  time.Now().Unix(),
+	}
+	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 runCmd(t *testing.T, ctx context.Context, args ...string) {
+	t.Helper()
+	newLogger := func() adaptors.Logger {
+		return logger.New(t)
+	}
+	if err := di.InvokeWithExtra(func(cmd adaptors.Cmd) {
+		exitCode := cmd.Run(ctx, append([]string{"kubelogin", "--v=1"}, args...), "HEAD")
+		if exitCode != 0 {
+			t.Errorf("exit status wants 0 but %d", exitCode)
+		}
+	}, newLogger); err != nil {
+		t.Errorf("Invoke returned error: %+v", err)
+	}
+}
+
+func startBrowserRequest(t *testing.T, ctx context.Context, tlsConfig *tls.Config) {
+	t.Helper()
+	client := http.Client{Transport: &http.Transport{TLSClientConfig: tlsConfig}}
+	req, err := http.NewRequest("GET", "http://localhost:8000/", nil)
+	if err != nil {
+		t.Errorf("could not create a request: %s", err)
+		return
+	}
+	req = req.WithContext(ctx)
+	go func() {
+		time.Sleep(50 * time.Millisecond)
+		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)
+		}
+	}()
+}
--- a/adaptors_test/keys/keys.go
+++ b/adaptors_test/keys/keys.go
@@ -0,0 +1,71 @@
+package keys
+
+import (
+	"crypto/rsa"
+	"crypto/tls"
+	"crypto/x509"
+	"encoding/base64"
+	"encoding/pem"
+	"io/ioutil"
+
+	"github.com/pkg/errors"
+)
+
+// TLSCACert is path to the CA certificate.
+// This should be generated by Makefile before test.
+const TLSCACert = "keys/testdata/ca.crt"
+
+// TLSCACertAsBase64 is a base64 encoded string of TLSCACert.
+var TLSCACertAsBase64 string
+
+// TLSCACertAsConfig is a TLS config including TLSCACert.
+var TLSCACertAsConfig = &tls.Config{RootCAs: x509.NewCertPool()}
+
+// TLSServerCert is path to the server certificate.
+// This should be generated by Makefile before test.
+const TLSServerCert = "keys/testdata/server.crt"
+
+// TLSServerKey is path to the server key.
+// This should be generated by Makefile before test.
+const TLSServerKey = "keys/testdata/server.key"
+
+// JWSKey is path to the key for signing ID tokens.
+const JWSKey = "keys/testdata/jws.key"
+
+// JWSKeyPair is the key pair loaded from JWSKey.
+var JWSKeyPair *rsa.PrivateKey
+
+func init() {
+	var err error
+	JWSKeyPair, err = readPrivateKey(JWSKey)
+	if err != nil {
+		panic(err)
+	}
+	b, err := ioutil.ReadFile(TLSCACert)
+	if err != nil {
+		panic(err)
+	}
+	TLSCACertAsBase64 = base64.StdEncoding.EncodeToString(b)
+	if !TLSCACertAsConfig.RootCAs.AppendCertsFromPEM(b) {
+		panic("could not append the CA cert")
+	}
+}
+
+func readPrivateKey(name string) (*rsa.PrivateKey, error) {
+	b, err := ioutil.ReadFile(name)
+	if err != nil {
+		return nil, errors.Wrapf(err, "could not read JWSKey")
+	}
+	block, rest := pem.Decode(b)
+	if block == nil {
+		return nil, errors.New("could not decode PEM")
+	}
+	if len(rest) > 0 {
+		return nil, errors.New("PEM should contain single key but multiple keys")
+	}
+	k, err := x509.ParsePKCS1PrivateKey(block.Bytes)
+	if err != nil {
+		return nil, errors.Wrapf(err, "could not parse the key")
+	}
+	return k, nil
+}
--- a/adaptors_test/keys/testdata/.gitignore
+++ b/adaptors_test/keys/testdata/.gitignore
@@ -0,0 +1,4 @@
+/CA
+*.key
+*.csr
+*.crt
--- a/adaptors_test/keys/testdata/Makefile
+++ b/adaptors_test/keys/testdata/Makefile
@@ -0,0 +1,53 @@
+.PHONY: clean
+
+all: server.crt ca.crt jws.key
+
+clean:
+	rm -v ca.* server.*
+
+ca.key:
+	openssl genrsa -out $@ 1024
+
+ca.csr: openssl.cnf ca.key
+	openssl req -config openssl.cnf \
+		-new \
+		-key ca.key \
+		-subj "/CN=Hello CA" \
+		-out $@
+	openssl req -noout -text -in $@
+
+ca.crt: ca.csr ca.key
+	openssl x509 -req \
+		-signkey ca.key \
+		-in ca.csr \
+		-out $@
+	openssl x509 -text -in $@
+
+server.key:
+	openssl genrsa -out $@ 1024
+
+server.csr: openssl.cnf server.key
+	openssl req -config openssl.cnf \
+		-new \
+		-key server.key \
+		-subj "/CN=localhost" \
+		-out $@
+	openssl req -noout -text -in $@
+
+server.crt: openssl.cnf server.csr ca.key ca.crt
+	rm -fr ./CA
+	mkdir -p ./CA
+	touch CA/index.txt
+	touch CA/index.txt.attr
+	echo 00 > CA/serial
+	openssl ca -config openssl.cnf \
+		-extensions v3_req \
+		-batch \
+		-cert ca.crt \
+		-keyfile ca.key \
+		-in server.csr \
+		-out $@
+	openssl x509 -text -in $@
+
+jws.key:
+	openssl genrsa -out $@ 1024
--- a/adaptors_test/keys/testdata/openssl.cnf
+++ b/adaptors_test/keys/testdata/openssl.cnf
@@ -0,0 +1,37 @@
+[ ca ]
+default_ca      = CA_default
+
+[ CA_default ]
+dir             = ./CA
+certs           = $dir
+crl_dir         = $dir
+database        = $dir/index.txt
+new_certs_dir   = $dir
+default_md      = sha256
+policy          = policy_match
+serial          = $dir/serial
+default_days    = 365
+
+[ policy_match ]
+countryName             = optional
+stateOrProvinceName     = optional
+organizationName        = optional
+organizationalUnitName  = optional
+commonName              = supplied
+emailAddress            = optional
+
+[ req ]
+distinguished_name	= req_distinguished_name
+req_extensions = v3_req
+x509_extensions = v3_ca
+
+[ req_distinguished_name ]
+commonName			= Common Name (e.g. server FQDN or YOUR name)
+
+[ v3_req ]
+basicConstraints = CA:FALSE
+keyUsage = nonRepudiation, digitalSignature, keyEncipherment
+subjectAltName = DNS:localhost
+
+[ v3_ca ]
+basicConstraints = CA:true
--- a/integration_test/kubeconfig/kubeconfig.go
+++ b/integration_test/kubeconfig/kubeconfig.go
@@ -16,7 +16,6 @@ type Values struct {
 	IDPCertificateAuthority     string
 	IDPCertificateAuthorityData string
 	IDToken                     string
-	RefreshToken                string
 }

 // Create creates a kubeconfig file and returns path to it.
--- a/integration_test/kubeconfig/testdata/kubeconfig.yaml
+++ b/integration_test/kubeconfig/testdata/kubeconfig.yaml
@@ -30,8 +30,5 @@ users:
 #{{ end }}
 #{{ if .IDToken }}
        id-token: {{ .IDToken }}
-#{{ end }}
-#{{ if .RefreshToken }}
-        refresh-token: {{ .RefreshToken }}
 #{{ end }}
      name: oidc
--- a/adaptors_test/logger/logger.go
+++ b/adaptors_test/logger/logger.go
@@ -0,0 +1,21 @@
+package logger
+
+import (
+	"github.com/int128/kubelogin/adaptors"
+)
+
+func New(t testingLogger) *adaptors.Logger {
+	return adaptors.NewLoggerWith(&bridge{t})
+}
+
+type testingLogger interface {
+	Logf(format string, v ...interface{})
+}
+
+type bridge struct {
+	t testingLogger
+}
+
+func (b *bridge) Printf(format string, v ...interface{}) {
+	b.t.Logf(format, v...)
+}
--- a/di/di.go
+++ b/di/di.go
@@ -0,0 +1,42 @@
+// Package di provides dependency injection.
+package di
+
+import (
+	"github.com/int128/kubelogin/adaptors"
+	adaptorsInterfaces "github.com/int128/kubelogin/adaptors/interfaces"
+	"github.com/int128/kubelogin/usecases"
+	"github.com/pkg/errors"
+	"go.uber.org/dig"
+)
+
+var constructors = []interface{}{
+	usecases.NewLogin,
+
+	adaptors.NewCmd,
+	adaptors.NewKubeConfig,
+	adaptors.NewOIDC,
+	adaptors.NewHTTP,
+}
+
+var extraConstructors = []interface{}{
+	adaptors.NewLogger,
+}
+
+// Invoke runs the function with the default constructors.
+func Invoke(f func(cmd adaptorsInterfaces.Cmd)) error {
+	return InvokeWithExtra(f, extraConstructors...)
+}
+
+// InvokeWithExtra runs the function with the given constructors.
+func InvokeWithExtra(f func(cmd adaptorsInterfaces.Cmd), extra ...interface{}) error {
+	c := dig.New()
+	for _, constructor := range append(constructors, extra...) {
+		if err := c.Provide(constructor); err != nil {
+			return errors.Wrapf(err, "could not provide the constructor")
+		}
+	}
+	if err := c.Invoke(f); err != nil {
+		return errors.Wrapf(err, "could not invoke")
+	}
+	return nil
+}
--- a/di/di_test.go
+++ b/di/di_test.go
@@ -0,0 +1,18 @@
+package di_test
+
+import (
+	"testing"
+
+	adaptors "github.com/int128/kubelogin/adaptors/interfaces"
+	"github.com/int128/kubelogin/di"
+)
+
+func TestInvoke(t *testing.T) {
+	if err := di.Invoke(func(cmd adaptors.Cmd) {
+		if cmd == nil {
+			t.Errorf("cmd wants non-nil but nil")
+		}
+	}); err != nil {
+		t.Fatalf("Invoke returned error: %+v", err)
+	}
+}
--- a/dist/Dockerfile
+++ b/dist/Dockerfile
@@ -1,13 +0,0 @@
-FROM alpine:3.12
-
-ARG KUBELOGIN_VERSION="{{ env "VERSION" }}"
-ARG KUBELOGIN_SHA256="{{ sha256 .linux_amd64_archive }}"
-
-# Download the release and test the checksum
-RUN wget -O /kubelogin.zip "https://github.com/int128/kubelogin/releases/download/$KUBELOGIN_VERSION/kubelogin_linux_amd64.zip" && \
-    echo "$KUBELOGIN_SHA256  /kubelogin.zip" | sha256sum -c - && \
-    unzip /kubelogin.zip && \
-    rm /kubelogin.zip
-
-USER daemon
-ENTRYPOINT ["/kubelogin"]
--- a/dist/oidc-login.yaml
+++ b/dist/oidc-login.yaml
@@ -1,86 +0,0 @@
-apiVersion: krew.googlecontainertools.github.com/v1alpha2
-kind: Plugin
-metadata:
-  name: oidc-login
-spec:
-  homepage: https://github.com/int128/kubelogin
-  shortDescription: Log in to the OpenID Connect provider
-  description: |
-    This is a kubectl plugin for Kubernetes OpenID Connect (OIDC) authentication.
-
-    ## Credential plugin mode
-    kubectl executes oidc-login before calling the Kubernetes APIs.
-    oidc-login automatically opens the browser and you can log in to the provider.
-    After authentication, kubectl gets the token from oidc-login and you can access the cluster.
-    See https://github.com/int128/kubelogin#credential-plugin-mode for more.
-
-    ## Standalone mode
-    Run `kubectl oidc-login`.
-    It automatically opens the browser and you can log in to the provider.
-    After authentication, it writes the token to the kubeconfig and you can access the cluster.
-    See https://github.com/int128/kubelogin#standalone-mode for more.
-
-  caveats: |
-    You need to setup the OIDC provider, Kubernetes API server, role binding and kubeconfig.
-  version: {{ env "VERSION" }}
-  platforms:
-    - uri: https://github.com/int128/kubelogin/releases/download/{{ env "VERSION" }}/kubelogin_linux_amd64.zip
-      sha256: "{{ sha256 .linux_amd64_archive }}"
-      bin: kubelogin
-      files:
-        - from: kubelogin
-          to: .
-        - from: LICENSE
-          to: .
-      selector:
-        matchLabels:
-          os: linux
-          arch: amd64
-    - uri: https://github.com/int128/kubelogin/releases/download/{{ env "VERSION" }}/kubelogin_darwin_amd64.zip
-      sha256: "{{ sha256 .darwin_amd64_archive }}"
-      bin: kubelogin
-      files:
-        - from: kubelogin
-          to: .
-        - from: LICENSE
-          to: .
-      selector:
-        matchLabels:
-          os: darwin
-          arch: amd64
-    - uri: https://github.com/int128/kubelogin/releases/download/{{ env "VERSION" }}/kubelogin_windows_amd64.zip
-      sha256: "{{ sha256 .windows_amd64_archive }}"
-      bin: kubelogin.exe
-      files:
-        - from: kubelogin.exe
-          to: .
-        - from: LICENSE
-          to: .
-      selector:
-        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/credential-plugin-diagram.svg
+++ b/docs/credential-plugin-diagram.svg
--- a/docs/google.md
+++ b/docs/google.md
@@ -0,0 +1,100 @@
+# Getting Started with Google Identity Platform
+
+## Prerequisite
+
+- You have a Google account.
+- You have the Cluster Admin role of the Kubernetes cluster.
+- You can configure the Kubernetes API server.
+- `kubectl` and `kubelogin` are installed to your computer.
+
+## 1. Setup Google API
+
+Open [Google APIs Console](https://console.developers.google.com/apis/credentials) and create an OAuth client with the following setting:
+
+- Application Type: Other
+
+## 2. Setup Kubernetes API server
+
+Configure your Kubernetes API Server accepts [OpenID Connect Tokens](https://kubernetes.io/docs/reference/access-authn-authz/authentication/#openid-connect-tokens).
+
+### kops
+
+If you are using [kops](https://github.com/kubernetes/kops), run `kops edit cluster` and append the following settings:
+
+```yaml
+spec:
+  kubeAPIServer:
+    oidcIssuerURL: https://accounts.google.com
+    oidcClientID: YOUR_CLIENT_ID.apps.googleusercontent.com
+```
+
+## 3. Setup Kubernetes cluster
+
+Here assign the `cluster-admin` role to you.
+
+```yaml
+kind: ClusterRoleBinding
+apiVersion: rbac.authorization.k8s.io/v1
+metadata:
+  name: oidc-admin-group
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: ClusterRole
+  name: cluster-admin
+subjects:
+- kind: User
+  name: https://accounts.google.com#1234567890
+```
+
+You can create a custom role and assign it as well.
+
+## 4. Setup kubectl
+
+Configure `kubectl` for the OIDC authentication.
+
+```sh
+kubectl config set-credentials NAME \
+  --auth-provider oidc \
+  --auth-provider-arg idp-issuer-url=https://accounts.google.com \
+  --auth-provider-arg client-id=YOUR_CLIENT_ID.apps.googleusercontent.com \
+  --auth-provider-arg client-secret=YOUR_CLIENT_SECRET
+```
+
+## 5. Run kubelogin
+
+Run `kubelogin`.
+
+```
+% kubelogin
+2018/08/10 10:36:38 Reading .kubeconfig
+2018/08/10 10:36:38 Using current context: hello.k8s.local
+2018/08/10 10:36:41 Open http://localhost:8000 for authorization
+2018/08/10 10:36:45 GET /
+2018/08/10 10:37:07 GET /?state=...&session_state=...&code=ey...
+2018/08/10 10:37:08 Updated .kubeconfig
+```
+
+Now your `~/.kube/config` should be like:
+
+```yaml
+users:
+- name: hello.k8s.local
+  user:
+    auth-provider:
+      config:
+        idp-issuer-url: https://accounts.google.com
+        client-id: YOUR_CLIENT_ID.apps.googleusercontent.com
+        client-secret: YOUR_SECRET
+        id-token: ey...       # kubelogin will update ID token here
+        refresh-token: ey...  # kubelogin will update refresh token here
+      name: oidc
+```
+
+Make sure you can access to the Kubernetes cluster.
+
+```
+% kubectl get nodes
+NAME                                    STATUS    ROLES     AGE       VERSION
+ip-1-2-3-4.us-west-2.compute.internal   Ready     node      21d       v1.9.6
+ip-1-2-3-5.us-west-2.compute.internal   Ready     node      20d       v1.9.6
+```
--- a/docs/keycloak-login.png
+++ b/docs/keycloak-login.png
--- a/docs/keycloak.md
+++ b/docs/keycloak.md
@@ -0,0 +1,107 @@
+# Getting Started with Keycloak
+
+## Prerequisite
+
+- You have administrator access to the Keycloak.
+- You have the Cluster Admin role of the Kubernetes cluster.
+- You can configure the Kubernetes API server.
+- `kubectl` and `kubelogin` are installed to your computer.
+
+## 1. Setup Keycloak
+
+Open the Keycloak and create an OIDC client as follows:
+
+- Redirect URL: `http://localhost:8000/`
+- Issuer URL: `https://keycloak.example.com/auth/realms/YOUR_REALM`
+- Client ID: `kubernetes`
+- Groups claim: `groups`
+
+Create a group `kubernetes:admin` and join to it.
+This is used for group based access control.
+
+## 2. Setup Kubernetes API server
+
+Configure your Kubernetes API server accepts [OpenID Connect Tokens](https://kubernetes.io/docs/reference/access-authn-authz/authentication/#openid-connect-tokens).
+
+### kops
+
+If you are using [kops](https://github.com/kubernetes/kops), run `kops edit cluster` and append the following settings:
+
+```yaml
+spec:
+  kubeAPIServer:
+    oidcIssuerURL: https://keycloak.example.com/auth/realms/YOUR_REALM
+    oidcClientID: kubernetes
+    oidcGroupsClaim: groups
+```
+
+## 3. Setup Kubernetes cluster
+
+Here assign the `cluster-admin` role to the `kubernetes:admin` group.
+
+```yaml
+kind: ClusterRoleBinding
+apiVersion: rbac.authorization.k8s.io/v1
+metadata:
+  name: keycloak-admin-group
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: ClusterRole
+  name: cluster-admin
+subjects:
+- kind: Group
+  name: /kubernetes:admin
+```
+
+You can create a custom role and assign it as well.
+
+## 4. Setup kubectl
+
+Configure `kubectl` for the OIDC authentication.
+
+```sh
+kubectl config set-credentials NAME \
+  --auth-provider oidc \
+  --auth-provider-arg idp-issuer-url=https://keycloak.example.com/auth/realms/YOUR_REALM \
+  --auth-provider-arg client-id=kubernetes \
+  --auth-provider-arg client-secret=YOUR_CLIENT_SECRET
+```
+
+## 5. Run kubelogin
+
+Run `kubelogin`.
+
+```
+% kubelogin
+2018/08/10 10:36:38 Reading .kubeconfig
+2018/08/10 10:36:38 Using current context: hello.k8s.local
+2018/08/10 10:36:41 Open http://localhost:8000 for authorization
+2018/08/10 10:36:45 GET /
+2018/08/10 10:37:07 GET /?state=...&session_state=...&code=ey...
+2018/08/10 10:37:08 Updated .kubeconfig
+```
+
+Now your `~/.kube/config` should be like:
+
+```yaml
+users:
+- name: hello.k8s.local
+  user:
+    auth-provider:
+      config:
+        idp-issuer-url: https://keycloak.example.com/auth/realms/YOUR_REALM
+        client-id: kubernetes
+        client-secret: YOUR_SECRET
+        id-token: ey...       # kubelogin will update ID token here
+        refresh-token: ey...  # kubelogin will update refresh token here
+      name: oidc
+```
+
+Make sure you can access to the Kubernetes cluster.
+
+```
+% kubectl get nodes
+NAME                                    STATUS    ROLES     AGE       VERSION
+ip-1-2-3-4.us-west-2.compute.internal   Ready     node      21d       v1.9.6
+ip-1-2-3-5.us-west-2.compute.internal   Ready     node      20d       v1.9.6
+```
--- a/docs/setup.md
+++ b/docs/setup.md
@@ -1,226 +0,0 @@
-# Kubernetes OpenID Connection authentication
-
-This document guides how to set up Kubernetes OpenID Connect (OIDC) authentication.
-Let's see the following steps:
-
-1. Set up the OIDC provider
-1. Verify authentication
-1. Bind a cluster role
-1. Set up the Kubernetes API server
-1. Set up the kubeconfig
-1. Verify cluster access
-
-
-## 1. Set up the OIDC provider
-
-### Google Identity Platform
-
-You can log in with a Google account.
-
-Open [Google APIs Console](https://console.developers.google.com/apis/credentials) and create an OAuth client with the following setting:
-
- Application Type: Other
-
-Check the client ID and secret.
-Replace the following variables in the later sections.
-
-Variable                | Value
------------------------|------
-`ISSUER_URL`            | `https://accounts.google.com`
-`YOUR_CLIENT_ID`        | `xxx.apps.googleusercontent.com`
-`YOUR_CLIENT_SECRET`    | random string
-
-### Keycloak
-
-You can log in with a user of Keycloak.
-Make sure you have an administrator role of the Keycloak realm.
-
-Open Keycloak and create an OIDC client as follows:
-
- Client ID: `YOUR_CLIENT_ID`
- Valid Redirect URLs:
-    - `http://localhost:8000`
-    - `http://localhost:18000` (used if the port 8000 is already in use)
- Issuer URL: `https://keycloak.example.com/auth/realms/YOUR_REALM`
-
-You can associate client roles by adding the following mapper:
-
- Name: `groups`
- Mapper Type: `User Client Role`
- Client ID: `YOUR_CLIENT_ID`
- Client Role prefix: `kubernetes:`
- Token Claim Name: `groups`
- Add to ID token: on
-
-For example, if you have `admin` role of the client, you will get a JWT with the claim `{"groups": ["kubernetes:admin"]}`.
-
-Replace the following variables in the later sections.
-
-Variable                | Value
------------------------|------
-`ISSUER_URL`            | `https://keycloak.example.com/auth/realms/YOUR_REALM`
-`YOUR_CLIENT_ID`        | `YOUR_CLIENT_ID`
-`YOUR_CLIENT_SECRET`    | random string
-
-### Dex with GitHub
-
-You can log in with a GitHub account.
-
-Open [GitHub OAuth Apps](https://github.com/settings/developers) and create an application with the following setting:
-
- Application name: (any)
- Homepage URL: `https://dex.example.com`
- Authorization callback URL: `https://dex.example.com/callback`
-
-Deploy [Dex](https://github.com/dexidp/dex) with the following config:
-
-```yaml
-issuer: https://dex.example.com
-connectors:
- type: github
-  id: github
-  name: GitHub
-  config:
-    clientID: YOUR_GITHUB_CLIENT_ID
-    clientSecret: YOUR_GITHUB_CLIENT_SECRET
-    redirectURI: https://dex.example.com/callback
-staticClients:
- id: YOUR_CLIENT_ID
-  name: Kubernetes
-  redirectURIs:
-  - http://localhost:8000
-  - http://localhost:18000
-  secret: YOUR_DEX_CLIENT_SECRET
-```
-
-Replace the following variables in the later sections.
-
-Variable                | Value
------------------------|------
-`ISSUER_URL`            | `https://dex.example.com`
-`YOUR_CLIENT_ID`        | `YOUR_CLIENT_ID`
-`YOUR_CLIENT_SECRET`    | `YOUR_DEX_CLIENT_SECRET`
-
-### Okta
-
-You can log in with an Okta user.
-Okta supports [the authorization code flow with PKCE](https://developer.okta.com/docs/guides/implement-auth-code-pkce/overview/)
-and this section explains how to set up it.
-
-Open your Okta organization and create an application with the following options:
-
- Application type: Native
- Initiate login URI: `http://localhost:8000`
- Login redirect URIs:
-    - `http://localhost:8000`
-    - `http://localhost:18000` (used if the port 8000 is already in use)
- Allowed grant types: Authorization Code
- Client authentication: Use PKCE (for public clients)
-
-Replace the following variables in the later sections.
-
-Variable                | Value
------------------------|------
-`ISSUER_URL`            | `https://YOUR_ORGANIZATION.okta.com`
-`YOUR_CLIENT_ID`        | random string
-
-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
-
-Run the following command:
-
-```sh
-kubectl oidc-login setup \
-  --oidc-issuer-url=ISSUER_URL \
-  --oidc-client-id=YOUR_CLIENT_ID \
-  --oidc-client-secret=YOUR_CLIENT_SECRET
-```
-
-It launches the browser and navigates to `http://localhost:8000`.
-Please log in to the provider.
-
-You can set extra options, for example, extra scope or CA certificate.
-See also the full options.
-
-```sh
-kubectl oidc-login setup --help
-```
-
-
-## 3. Bind a cluster role
-
-Here bind `cluster-admin` role to you.
-
-```sh
-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.
-
-
-## 4. Set up the Kubernetes API server
-
-Add the following flags to kube-apiserver:
-
-```
--oidc-issuer-url=ISSUER_URL
--oidc-client-id=YOUR_CLIENT_ID
-```
-
-See [Kubernetes Authenticating: OpenID Connect Tokens](https://kubernetes.io/docs/reference/access-authn-authz/authentication/#openid-connect-tokens) for the all flags.
-
-If you are using [kops](https://github.com/kubernetes/kops), run `kops edit cluster` and append the following settings:
-
-```yaml
-spec:
-  kubeAPIServer:
-    oidcIssuerURL: ISSUER_URL
-    oidcClientID: YOUR_CLIENT_ID
-```
-
-If you are using [kube-aws](https://github.com/kubernetes-incubator/kube-aws), append the following settings to the `cluster.yaml`:
-
-```yaml
-       oidc:
-         enabled: true
-         issuerUrl: ISSUER_URL
-         clientId: YOUR_CLIENT_ID
-```
-
-
-## 5. Set up the kubeconfig
-
-Add `oidc` user to the kubeconfig.
-
-```sh
-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=ISSUER_URL \
-  --exec-arg=--oidc-client-id=YOUR_CLIENT_ID \
-  --exec-arg=--oidc-client-secret=YOUR_CLIENT_SECRET
-```
-
-
-## 6. Verify cluster access
-
-Make sure you can access the Kubernetes cluster.
-
-```sh
-kubectl --user=oidc cluster-info
-```
-
-You can switch the current context to oidc.
-
-```sh
-kubectl config set-context --current --user=oidc
-```
-
-You can share the kubeconfig to your team members for on-boarding.
--- a/docs/standalone-mode.md
+++ b/docs/standalone-mode.md
@@ -1,129 +0,0 @@
-# Standalone mode
-
-You can run kubelogin as a standalone command.
-In this mode, you need to manually run the command before running kubectl.
-
-Configure the kubeconfig like:
-
-```yaml
- name: keycloak
-  user:
-    auth-provider:
-      config:
-        client-id: YOUR_CLIENT_ID
-        client-secret: YOUR_CLIENT_SECRET
-        idp-issuer-url: https://issuer.example.com
-      name: oidc
-```
-
-Run kubelogin:
-
-```sh
-kubelogin
-
-# or run as a kubectl plugin
-kubectl oidc-login
-```
-
-It automatically opens the browser and you can log in to the provider.
-
-<img src="keycloak-login.png" alt="keycloak-login" width="455" height="329">
-
-After authentication, kubelogin writes the ID token and refresh token to the kubeconfig.
-
-```
-% kubelogin
-Open http://localhost:8000 for authentication
-You got a valid token until 2019-05-18 10:28:51 +0900 JST
-Updated ~/.kubeconfig
-```
-
-Now you can access the cluster.
-
-```
-% kubectl get pods
-NAME                          READY   STATUS    RESTARTS   AGE
-echoserver-86c78fdccd-nzmd5   1/1     Running   0          26d
-```
-
-Your kubeconfig looks like:
-
-```yaml
-users:
- name: keycloak
-  user:
-    auth-provider:
-      config:
-        client-id: YOUR_CLIENT_ID
-        client-secret: YOUR_CLIENT_SECRET
-        idp-issuer-url: https://issuer.example.com
-        id-token: ey...       # kubelogin will add or update the ID token here
-        refresh-token: ey...  # kubelogin will add or update the refresh token here
-      name: oidc
-```
-
-If the ID token is valid, kubelogin does nothing.
-
-```
-% kubelogin
-You already have a valid token until 2019-05-18 10:28:51 +0900 JST
-```
-
-If the ID token has expired, kubelogin will refresh the token using the refresh token in the kubeconfig.
-If the refresh token has expired, kubelogin will proceed the authentication.
-
-
-## Usage
-
-### Kubeconfig
-
-You can set path to the kubeconfig file by the option or the environment variable just like kubectl.
-It defaults to `~/.kube/config`.
-
-```sh
-# by the option
-kubelogin --kubeconfig /path/to/kubeconfig
-
-# by the environment variable
-KUBECONFIG="/path/to/kubeconfig1:/path/to/kubeconfig2" kubelogin
-```
-
-If you set multiple files, kubelogin will find the file which has the current authentication (i.e. `user` and `auth-provider`) and write a token to it.
-
-Kubelogin supports the following keys of `auth-provider` in a kubeconfig.
-See [kubectl authentication](https://kubernetes.io/docs/reference/access-authn-authz/authentication/#using-kubectl) for more.
-
-Key | Direction | Value
----|-----------|------
-`idp-issuer-url`                  | Read (Mandatory) | Issuer URL of the provider.
-`client-id`                       | Read (Mandatory) | Client ID of the provider.
-`client-secret`                   | Read (Mandatory) | Client Secret of the provider.
-`idp-certificate-authority`       | Read | CA certificate path of the provider.
-`idp-certificate-authority-data`  | Read | Base64 encoded CA certificate of the provider.
-`extra-scopes`                    | Read | Scopes to request to the provider (comma separated).
-`id-token`                        | Write | ID token got from the provider.
-`refresh-token`                   | Write | Refresh token got from the provider.
-
-### Extra scopes
-
-You can set the extra scopes to request to the provider by `extra-scopes` in the kubeconfig.
-
-```sh
-kubectl config set-credentials keycloak --auth-provider-arg extra-scopes=email
-```
-
-Currently kubectl does not accept multiple scopes, so you need to edit the kubeconfig as like:
-
-```sh
-kubectl config set-credentials keycloak --auth-provider-arg extra-scopes=SCOPES
-sed -i '' -e s/SCOPES/email,profile/ $KUBECONFIG
-```
-
-### CA Certificates
-
-You can use your self-signed certificates for the provider.
-
-```sh
-kubectl config set-credentials keycloak \
-  --auth-provider-arg idp-certificate-authority=$HOME/.kube/keycloak-ca.pem
-```
--- a/docs/system-test-diagram.svg
+++ b/docs/system-test-diagram.svg
--- a/docs/team_ops.md
+++ b/docs/team_ops.md
@@ -0,0 +1,40 @@
+# Team Operation
+
+## kops
+
+Export the kubeconfig.
+
+```sh
+KUBECONFIG=.kubeconfig kops export kubecfg hello.k8s.local
+```
+
+Remove the `admin` access from the kubeconfig.
+It should look as like:
+
+```yaml
+apiVersion: v1
+kind: Config
+clusters:
+  - cluster:
+      certificate-authority-data: LS...
+      server: https://api.hello.k8s.example.com
+      name: hello.k8s.local
+contexts:
+- context:
+    cluster: hello.k8s.local
+    user: hello.k8s.local
+  name: hello.k8s.local
+current-context: hello.k8s.local
+preferences: {}
+users:
+- name: hello.k8s.local
+  user:
+    auth-provider:
+      name: oidc
+      config:
+        client-id: YOUR_CLIEND_ID
+        client-secret: YOUR_CLIENT_SECRET
+        idp-issuer-url: YOUR_ISSUER
+```
+
+You can share the kubeconfig to your team members for easy onboarding.
--- a/go.mod
+++ b/go.mod
@@ -1,26 +1,35 @@
 module github.com/int128/kubelogin

-go 1.12
-
 require (
-	github.com/chromedp/chromedp v0.5.3
-	github.com/coreos/go-oidc v2.2.1+incompatible
+	github.com/coreos/go-oidc v2.0.0+incompatible
+	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/dgrijalva/jwt-go v3.2.0+incompatible
-	github.com/golang/mock v1.4.4
-	github.com/google/go-cmp v0.5.1
-	github.com/google/wire v0.4.0
-	github.com/int128/oauth2cli v1.12.1
-	github.com/pkg/browser v0.0.0-20180916011732-0a3d74bf9ce4
+	github.com/gogo/protobuf v1.2.1 // indirect
+	github.com/golang/mock v1.2.0
+	github.com/google/gofuzz v0.0.0-20170612174753-24818f796faf // indirect
+	github.com/imdario/mergo v0.3.7 // indirect
+	github.com/int128/oauth2cli v1.2.1
+	github.com/jessevdk/go-flags v1.4.0
+	github.com/json-iterator/go v1.1.6 // indirect
+	github.com/mitchellh/go-homedir v1.1.0
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/reflect2 v1.0.1 // indirect
+	github.com/pkg/errors v0.8.1
 	github.com/pquerna/cachecontrol v0.0.0-20180517163645-1555304b9b35 // indirect
-	github.com/spf13/cobra v1.0.0
-	github.com/spf13/pflag v1.0.5
-	golang.org/x/crypto v0.0.0-20200220183623-bac4c82f6975
-	golang.org/x/oauth2 v0.0.0-20200107190931-bf48bf16ab8d
-	golang.org/x/sync v0.0.0-20200625203802-6e8e738ad208
-	golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543
-	gopkg.in/square/go-jose.v2 v2.3.1 // indirect
-	gopkg.in/yaml.v2 v2.3.0
-	k8s.io/apimachinery v0.18.6
-	k8s.io/client-go v0.18.6
-	k8s.io/klog v1.0.0
+	github.com/spf13/pflag v1.0.3 // indirect
+	github.com/stretchr/testify v1.3.0 // indirect
+	go.uber.org/dig v1.7.0
+	golang.org/x/crypto v0.0.0-20190325154230-a5d413f7728c // indirect
+	golang.org/x/net v0.0.0-20190328230028-74de082e2cca // indirect
+	golang.org/x/oauth2 v0.0.0-20190319182350-c85d3e98c914
+	golang.org/x/sync v0.0.0-20190227155943-e225da77a7e6
+	golang.org/x/time v0.0.0-20190308202827-9d24e82272b4 // indirect
+	gopkg.in/inf.v0 v0.9.1 // indirect
+	gopkg.in/square/go-jose.v2 v2.3.0 // indirect
+	gopkg.in/yaml.v2 v2.2.2
+	k8s.io/api v0.0.0-20190222213804-5cb15d344471 // indirect
+	k8s.io/apimachinery v0.0.0-20190221213512-86fb29eff628 // indirect
+	k8s.io/client-go v10.0.0+incompatible
+	k8s.io/klog v0.2.0 // indirect
+	sigs.k8s.io/yaml v1.1.0 // indirect
 )
--- a/go.sum
+++ b/go.sum
@@ -1,339 +1,88 @@
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+k8s.io/client-go v10.0.0+incompatible/go.mod h1:7vJpHMYJwNQCWgzmNV+VYUl1zCObLyodBc8nIyt8L5s=
+k8s.io/klog v0.2.0 h1:0ElL0OHzF3N+OhoJTL0uca20SxtYt4X4+bzHeqrB83c=
+k8s.io/klog v0.2.0/go.mod h1:Gq+BEi5rUBO/HRz0bTSXDUcqjScdoY3a9IHpCEIOOfk=
 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/infrastructure/http.go
+++ b/infrastructure/http.go
@@ -0,0 +1,50 @@
+package infrastructure
+
+import (
+	"net/http"
+	"net/http/httputil"
+
+	"github.com/int128/kubelogin/adaptors/interfaces"
+)
+
+const (
+	logLevelDumpHeaders = 2
+	logLevelDumpBody    = 3
+)
+
+type LoggingTransport struct {
+	Base   http.RoundTripper
+	Logger adaptors.Logger
+}
+
+func (t *LoggingTransport) RoundTrip(req *http.Request) (*http.Response, error) {
+	if !t.IsDumpEnabled() {
+		return t.Base.RoundTrip(req)
+	}
+
+	reqDump, err := httputil.DumpRequestOut(req, t.IsDumpBodyEnabled())
+	if err != nil {
+		t.Logger.Debugf(logLevelDumpHeaders, "Error: could not dump the request: %s", err)
+		return t.Base.RoundTrip(req)
+	}
+	t.Logger.Debugf(logLevelDumpHeaders, "%s", string(reqDump))
+	resp, err := t.Base.RoundTrip(req)
+	if err != nil {
+		return resp, err
+	}
+	respDump, err := httputil.DumpResponse(resp, t.IsDumpBodyEnabled())
+	if err != nil {
+		t.Logger.Debugf(logLevelDumpHeaders, "Error: could not dump the response: %s", err)
+		return resp, err
+	}
+	t.Logger.Debugf(logLevelDumpHeaders, "%s", string(respDump))
+	return resp, err
+}
+
+func (t *LoggingTransport) IsDumpEnabled() bool {
+	return t.Logger.IsEnabled(logLevelDumpHeaders)
+}
+
+func (t *LoggingTransport) IsDumpBodyEnabled() bool {
+	return t.Logger.IsEnabled(logLevelDumpBody)
+}
--- a/infrastructure/http_test.go
+++ b/infrastructure/http_test.go
@@ -0,0 +1,90 @@
+package infrastructure
+
+import (
+	"bufio"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+
+	"github.com/golang/mock/gomock"
+	"github.com/int128/kubelogin/adaptors/interfaces"
+	"github.com/int128/kubelogin/adaptors/mock_adaptors"
+)
+
+type mockTransport struct {
+	req  *http.Request
+	resp *http.Response
+}
+
+func (t *mockTransport) RoundTrip(req *http.Request) (*http.Response, error) {
+	t.req = req
+	return t.resp, nil
+}
+
+func TestLoggingTransport_RoundTrip(t *testing.T) {
+	ctrl := gomock.NewController(t)
+	defer ctrl.Finish()
+
+	logger := mock_adaptors.NewLogger(t, ctrl)
+	logger.EXPECT().
+		IsEnabled(gomock.Any()).
+		Return(true).
+		AnyTimes()
+
+	req := httptest.NewRequest("GET", "http://example.com/hello", nil)
+	resp, err := http.ReadResponse(bufio.NewReader(strings.NewReader(`HTTP/1.1 200 OK
+Host: example.com
+
+dummy`)), req)
+	if err != nil {
+		t.Errorf("could not create a response: %s", err)
+	}
+	defer resp.Body.Close()
+
+	transport := &LoggingTransport{
+		Base:   &mockTransport{resp: resp},
+		Logger: logger,
+	}
+	gotResp, err := transport.RoundTrip(req)
+	if err != nil {
+		t.Errorf("RoundTrip error: %s", err)
+	}
+	if gotResp != resp {
+		t.Errorf("resp wants %v but %v", resp, gotResp)
+	}
+}
+
+func TestLoggingTransport_IsDumpEnabled(t *testing.T) {
+	ctrl := gomock.NewController(t)
+	defer ctrl.Finish()
+
+	logger := mock_adaptors.NewLogger(t, ctrl)
+	logger.EXPECT().
+		IsEnabled(adaptors.LogLevel(logLevelDumpHeaders)).
+		Return(true)
+
+	transport := &LoggingTransport{
+		Logger: logger,
+	}
+	if transport.IsDumpEnabled() != true {
+		t.Errorf("IsDumpEnabled wants true")
+	}
+}
+
+func TestLoggingTransport_IsDumpBodyEnabled(t *testing.T) {
+	ctrl := gomock.NewController(t)
+	defer ctrl.Finish()
+
+	logger := mock_adaptors.NewLogger(t, ctrl)
+	logger.EXPECT().
+		IsEnabled(adaptors.LogLevel(logLevelDumpBody)).
+		Return(true)
+
+	transport := &LoggingTransport{
+		Logger: logger,
+	}
+	if transport.IsDumpBodyEnabled() != true {
+		t.Errorf("IsDumpBodyEnabled wants true")
+	}
+}
--- a/integration_test/credetial_plugin_test.go
+++ b/integration_test/credetial_plugin_test.go
@@ -1,420 +0,0 @@
-package integration_test
-
-import (
-	"bytes"
-	"context"
-	"encoding/json"
-	"io"
-	"io/ioutil"
-	"os"
-	"testing"
-	"time"
-
-	"github.com/google/go-cmp/cmp"
-	"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/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.
-//
-// 1. Start the auth server.
-// 2. Run the Cmd.
-// 3. Open a request for the local server.
-// 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)
-	}
-	defer func() {
-		if err := os.RemoveAll(tokenCacheDir); err != nil {
-			t.Errorf("could not clean up the cache dir: %s", err)
-		}
-	}()
-
-	for name, tc := range map[string]struct {
-		keyPair keypair.KeyPair
-		args    []string
-	}{
-		"NoTLS": {},
-		"TLS": {
-			keyPair: keypair.Server,
-			args:    []string{"--certificate-authority", keypair.Server.CACertPath},
-		},
-	} {
-		httpDriverOption := httpdriver.Option{
-			TLSConfig:    tc.keyPair.TLSConfig,
-			BodyContains: "Authenticated",
-		}
-
-		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, httpDriverOption),
-					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, httpDriverOption),
-						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, httpDriverOption),
-						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, httpDriverOption),
-						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"},
-			},
-		})
-		defer sv.Shutdown(t, ctx)
-		var stdout bytes.Buffer
-		runGetToken(t, ctx, getTokenConfig{
-			tokenCacheDir: tokenCacheDir,
-			issuerURL:     sv.IssuerURL(),
-			httpDriver:    httpdriver.New(ctx, t, httpdriver.Option{BodyContains: "Authenticated"}),
-			now:           now,
-			stdout:        &stdout,
-		})
-		assertCredentialPluginStdout(t, &stdout, sv.LastTokenResponse().IDToken, now.Add(time.Hour))
-	})
-
-	t.Run("TLSData", func(t *testing.T) {
-		t.Parallel()
-		ctx, cancel := context.WithTimeout(context.TODO(), timeout)
-		defer cancel()
-		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)
-		var stdout bytes.Buffer
-		runGetToken(t, ctx, getTokenConfig{
-			tokenCacheDir: tokenCacheDir,
-			issuerURL:     sv.IssuerURL(),
-			httpDriver:    httpdriver.New(ctx, t, httpdriver.Option{TLSConfig: keypair.Server.TLSConfig, BodyContains: "Authenticated"}),
-			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()
-		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, httpdriver.Option{BodyContains: "Authenticated"}),
-			now:           now,
-			stdout:        &stdout,
-			args: []string{
-				"--oidc-extra-scope", "email",
-				"--oidc-extra-scope", "profile",
-			},
-		})
-		assertCredentialPluginStdout(t, &stdout, sv.LastTokenResponse().IDToken, now.Add(time.Hour))
-	})
-
-	t.Run("OpenURLAfterAuthentication", 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:",
-			},
-			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, httpdriver.Option{BodyContains: "URL=https://example.com/success"}),
-			now:           now,
-			stdout:        &stdout,
-			args:          []string{"--open-url-after-authentication", "https://example.com/success"},
-		})
-		assertCredentialPluginStdout(t, &stdout, sv.LastTokenResponse().IDToken, now.Add(time.Hour))
-	})
-
-	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, httpdriver.Option{BodyContains: "Authenticated"}),
-			now:           now,
-			stdout:        &stdout,
-			args:          []string{"--oidc-redirect-url-hostname", "127.0.0.1"},
-		})
-		assertCredentialPluginStdout(t, &stdout, sv.LastTokenResponse().IDToken, now.Add(time.Hour))
-	})
-
-	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, httpdriver.Option{BodyContains: "Authenticated"}),
-			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))
-	})
-}
-
-type getTokenConfig struct {
-	tokenCacheDir string
-	issuerURL     string
-	httpDriver    browser.Interface
-	stdout        io.Writer
-	now           time.Time
-	args          []string
-}
-
-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",
-		"--token-cache-dir", cfg.tokenCacheDir,
-		"--oidc-issuer-url", cfg.issuerURL,
-		"--oidc-client-id", "kubernetes",
-		"--listen-address", "127.0.0.1:0",
-	}, cfg.args...), "latest")
-	if exitCode != 0 {
-		t.Errorf("exit status wants 0 but %d", exitCode)
-	}
-}
-
-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/httpdriver/http_driver.go
+++ b/integration_test/httpdriver/http_driver.go
@@ -1,70 +0,0 @@
-// Package httpdriver provides a test double of the browser.
-package httpdriver
-
-import (
-	"context"
-	"crypto/tls"
-	"io/ioutil"
-	"net/http"
-	"strings"
-	"testing"
-)
-
-type Option struct {
-	TLSConfig    *tls.Config
-	BodyContains string
-}
-
-// New returns a client to simulate browser access.
-func New(ctx context.Context, t *testing.T, o Option) *client {
-	return &client{ctx, t, o}
-}
-
-// 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
-	o   Option
-}
-
-func (c *client) Open(url string) error {
-	client := http.Client{Transport: &http.Transport{TLSClientConfig: c.o.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)
-	}
-	b, err := ioutil.ReadAll(resp.Body)
-	if err != nil {
-		c.t.Errorf("could not read body: %s", err)
-		return nil
-	}
-	body := string(b)
-	if !strings.Contains(body, c.o.BodyContains) {
-		c.t.Errorf("body should contain %s but was %s", c.o.BodyContains, body)
-	}
-	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/keypair/keypair.go
+++ b/integration_test/keypair/keypair.go
@@ -1,62 +0,0 @@
-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
@@ -1,26 +0,0 @@
-EXPIRY := 3650
-OUTPUT_DIR := testdata
-TARGETS := ca.key
-TARGETS += ca.crt
-TARGETS += server.key
-TARGETS += server.crt
-
-.PHONY: all
-all: $(TARGETS)
-
-ca.key:
-	openssl genrsa -out $@ 2048
-ca.csr: ca.key
-	openssl req -new -key ca.key -out $@ -subj "/CN=hello-ca" -config openssl.cnf
-ca.crt: ca.key ca.csr
-	openssl x509 -req -in ca.csr -signkey ca.key -out $@ -days $(EXPIRY)
-server.key:
-	openssl genrsa -out $@ 2048
-server.csr: openssl.cnf server.key
-	openssl req -new -key server.key -out $@ -subj "/CN=localhost" -config openssl.cnf
-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
-
-.PHONY: clean
-clean:
-	-rm -v $(TARGETS)
--- a/integration_test/keypair/testdata/ca.crt
+++ b/integration_test/keypair/testdata/ca.crt
@@ -1,17 +0,0 @@
-----BEGIN CERTIFICATE-----
-MIICojCCAYoCCQCNsdXicWqF2DANBgkqhkiG9w0BAQUFADATMREwDwYDVQQDDAho
-ZWxsby1jYTAeFw0yMDAyMDYwMTMzMzNaFw0zMDAyMDMwMTMzMzNaMBMxETAPBgNV
-BAMMCGhlbGxvLWNhMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAxcPN
-dS88B6ewqVn/m9yO74OLIwNrqMci8l7olP9XlcJhxUZs+3WZQpsSj5nC4yEx8uPQ
-bTtBKnXXVDe+8k7OsLTruu9+isTaYk4o/TZbuw/N31ZAiT0pJw8hdypTQyMLbeDr
-Vl4bbrfbYywx30DyrHxUkgzOWs459Uwc1wWu0W7M21GY4KENHFE3OAcD58FMvvrh
-vgkslATwwW4M2UtXUFJ8XHh26g/J450DU2gwNxpcSdIsvFE6zSyAxU55RElph7mE
-ru9cNWAYhCRZvlZQ2VlH7C6JQ3SHyA9RZmBbPpXhtl9zavFkGx2MEwDp/3FmUukR
-yJnS2KnAo0QdBeS1LQIDAQABMA0GCSqGSIb3DQEBBQUAA4IBAQAXGfoDwuKY4TyF
-fhKg553Y5I6VDCDc97jyW9yyfc0kvPjQc4EGQV+1eQqMSeh2THpgEEKk9hH/g35a
-grPRcBTsEWpbQd16yWyulQeyOtPeWZB2FvAigMaAdMmeXlTs6++gJ6PjPuACa2Jl
-nJ/AjCqKFxkn0yEVkPTY0c/I9A12xhCmATqIrQiK1pPowiFxQb4M8Cm0z0AkaJZr
-iW0NCOJlLzBqRpFquL4umNaIsxTmOshfM70NpQGRjKREBuK6S0qWsRR0wz4b9Rvi
-62qW4zU94q2EDIoCItjHP4twGENXJDC0vLCsKfA5AvbPzszd5/4ifYe2C00Rn7/O
-lIxrspMm
-----END CERTIFICATE-----
--- a/integration_test/keypair/testdata/ca.csr
+++ b/integration_test/keypair/testdata/ca.csr
@@ -1,17 +0,0 @@
-----BEGIN CERTIFICATE REQUEST-----
-MIICrDCCAZQCAQAwEzERMA8GA1UEAwwIaGVsbG8tY2EwggEiMA0GCSqGSIb3DQEB
-AQUAA4IBDwAwggEKAoIBAQDFw811LzwHp7CpWf+b3I7vg4sjA2uoxyLyXuiU/1eV
-wmHFRmz7dZlCmxKPmcLjITHy49BtO0EqdddUN77yTs6wtOu6736KxNpiTij9Nlu7
-D83fVkCJPSknDyF3KlNDIwtt4OtWXhtut9tjLDHfQPKsfFSSDM5azjn1TBzXBa7R
-bszbUZjgoQ0cUTc4BwPnwUy++uG+CSyUBPDBbgzZS1dQUnxceHbqD8njnQNTaDA3
-GlxJ0iy8UTrNLIDFTnlESWmHuYSu71w1YBiEJFm+VlDZWUfsLolDdIfID1FmYFs+
-leG2X3Nq8WQbHYwTAOn/cWZS6RHImdLYqcCjRB0F5LUtAgMBAAGgVDBSBgkqhkiG
-9w0BCQ4xRTBDMAkGA1UdEwQCMAAwCwYDVR0PBAQDAgXgMBQGA1UdEQQNMAuCCWxv
-Y2FsaG9zdDATBgNVHSUEDDAKBggrBgEFBQcDATANBgkqhkiG9w0BAQsFAAOCAQEA
-o/Uthp3NWx0ydTn/GBZI+vA3gI7Qd9UwLvwkeinldRlPM9DOXpG6LR0C40f6u+fj
-mXvUDerveYJI8rpo+Ds0UVqy63AH/zZLG7M96L5Nv2KnK40bkfVNez858Yqp1u17
-/ci1ZsQIElU5v2qKozaHdQThDVtD5ZZdZoQwLvBLE/Dwpe/4VZZFh8smPMR+Mhcq
-+b7gpSy1RiUffk0ZMjuF9Nc9OODdQMTCf+86i0qWXGVzkhfHKAGv+xarHEztcmxF
-GUgUYW8DMvYBjEzaGRM1n0aIFkQO6y8SUXvGMIGBSMC4jfBH3ghIXg1+nD6Uah4D
-16r+CLjFsDUdn/DK/fIQVw==
-----END CERTIFICATE REQUEST-----
--- a/integration_test/keypair/testdata/ca.key
+++ b/integration_test/keypair/testdata/ca.key
@@ -1,27 +0,0 @@
-----BEGIN RSA PRIVATE KEY-----
-MIIEowIBAAKCAQEAxcPNdS88B6ewqVn/m9yO74OLIwNrqMci8l7olP9XlcJhxUZs
-+3WZQpsSj5nC4yEx8uPQbTtBKnXXVDe+8k7OsLTruu9+isTaYk4o/TZbuw/N31ZA
-iT0pJw8hdypTQyMLbeDrVl4bbrfbYywx30DyrHxUkgzOWs459Uwc1wWu0W7M21GY
-4KENHFE3OAcD58FMvvrhvgkslATwwW4M2UtXUFJ8XHh26g/J450DU2gwNxpcSdIs
-vFE6zSyAxU55RElph7mEru9cNWAYhCRZvlZQ2VlH7C6JQ3SHyA9RZmBbPpXhtl9z
-avFkGx2MEwDp/3FmUukRyJnS2KnAo0QdBeS1LQIDAQABAoIBAHSoWtMsaMnPNlu/
-thM32K0auIGP6/rkdQ3pxGLX+M9jmY7oSzNOHHj4xssklZyroS45CmLU2Ez2tG1+
-cMm4iR4dqwxbaBbtpjDlEDLF1PiUiwmadHlANb1PpJsJwZHR41UOn2QUITR/ig+H
-K2gZhM0QjkaU/Uj9a5zyJ/UC6iupmgCtj8ij65B49qKMODxV4gqZstRSZiJ3gb6R
-TBeR3PUWQS62MZueEQz2eF0eXkXKsFWcbLfHArjfIJ533zW68A0vabgqOhCwJTks
-+rkyaKUjEwJJQcgpCfUI4t9HAwICqYtw0fQdDDaMak2XTDFnGHn1/VfSi818U5Sa
-jZ+/uIECgYEA4uCd5ISsLWebSv2r5f97N8+WcW0MSJ0XP5MniiMvlaNOtJmoN3H0
-PlgR3uwpH9TNWHITZEEb/I93r2E3f24v2018g0uJuwiRDusxHs7yuxw/93Y5rwtG
-3twL1k0GyeLCxfM2y2QQU/awXISx7nNk2f0umvTWmjrEw632oQSWCSECgYEA3yaF
-zDk7k1u1GdZAh+pQAyUtjzHSvQjiE2JzLaH8BTorACrczRascX5yyMi0QfLYnoYt
-UL9dCb4Z8HUclj55kBSx8anvVtf3XAT3hZ3sm8LV3JLGDeURGS8rGdV+tyFk7zw9
-XgvaLj3xjB5CoJvtOhbXvqF9M9yp4TMBb5El7o0CgYBTx5Bm15thNPZCrgQxbbOJ
-u42ZmyRDGEeCgYvDVhT3VBP3WxqkRt9juk/3GwxgpcuikpWYmvaDwFL5H5RH6V+g
-wy9sqJNWzuYKNU2xS8iU0ezJLA5HFon4OBfi7hTIroUwZgzg9LWW2+zqbVHrdQ9T
-9Eumiy1ITNVmUTJW6YOiIQKBgBE4BsEAdZFkVTAeMTKLqQrlFoPjI1DE27UFNsAB
-rNG2cFT9+bW1ly7WxAKsQgSIuaBZ2CtP6Nz0l0nPr5oEThsJDcYJB9faqFKoa3Ua
-/4PxX9E6Xh/6WfxogFno+HMnF4PCUTXtkjNZQkc+moOMJJ0D4DfsfB3BXDZtWiIC
-wDuNAoGBAN5ZFTXwE1VpWxIWq5dV9+0aVOP/eB+h7Pt+u2xyRip31FGcpGEzGniu
-VmOzWApW7NmvD0QWtstJWlCpsw+rOptAL0oVunlB70KuYuA+2Q5g/Cw3kUrvXqbe
-mkCoV21eFAmpU+I6z/n7pUDXPuUsmTkzmwedv0HUuNSQJmHZOMPD
-----END RSA PRIVATE KEY-----
--- a/integration_test/keypair/testdata/ca.srl
+++ b/integration_test/keypair/testdata/ca.srl
@@ -1 +0,0 @@
-9E12C7A1AF348811
--- a/integration_test/keypair/testdata/openssl.cnf
+++ b/integration_test/keypair/testdata/openssl.cnf
@@ -1,14 +0,0 @@
-[ req ]
-distinguished_name = req_distinguished_name
-req_extensions = v3_req
-
-[ req_distinguished_name ]
-
-[ v3_req ]
-basicConstraints = CA:FALSE
-keyUsage = nonRepudiation, digitalSignature, keyEncipherment
-subjectAltName = @alt_names
-extendedKeyUsage = serverAuth
-
-[alt_names]
-DNS.1 = localhost
--- a/integration_test/keypair/testdata/server.crt
+++ b/integration_test/keypair/testdata/server.crt
@@ -1,18 +0,0 @@
-----BEGIN CERTIFICATE-----
-MIIC7zCCAdegAwIBAgIJAJ4Sx6GvNIgRMA0GCSqGSIb3DQEBCwUAMBMxETAPBgNV
-BAMMCGhlbGxvLWNhMB4XDTIwMDIwNjAxMzMzM1oXDTMwMDIwMzAxMzMzM1owFDES
-MBAGA1UEAwwJbG9jYWxob3N0MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKC
-AQEA3CJvDbbiiY/o9lgzeABLCtZe56h2w9Dzejy02M6F7yVyphLtJr+/AxI8k5Er
-MFRitkzgIUkLn/90CZjPI3k5OnLtUAJ4XLj4gUGjziy4TKyVaU0XK41ZSbDAchbW
-349lsEgW5ZnL4qNaZeCvvbYec+RroVc6ZXCcDp4BATTkC3gSVF92+TzrrlbkZ5+W
-YVeoMpAPWDPq2zwQx4RcYlpkpI/fzLezRqjRcZJx3FDgkGuwwhzXfVUpxJ/DYLXZ
-yHCKyaT7e8YIs8e7TRekOwrLCfssfhJSdWopf6aYRZFV+2ovP0Nggn6XJNh/g1QK
-o4wzJAf6v5WMc0jEvb7EuSG+nwIDAQABo0UwQzAJBgNVHRMEAjAAMAsGA1UdDwQE
-AwIF4DAUBgNVHREEDTALgglsb2NhbGhvc3QwEwYDVR0lBAwwCgYIKwYBBQUHAwEw
-DQYJKoZIhvcNAQELBQADggEBACqlq8b7trNRtKUm1PbY7dnrAFCOnV4OT2R98s17
-Q6tmCXM1DvQ101W0ih/lh6iPyU4JM2A0kvO+gizuL/Dmvb6oh+3ox0mMLposptso
-gCE1K3SXlvlcLdM6hXRJ5+XwlSCHM6o2Y4yABnKjT6Zr+CMh86a5abDx33hkJ4QR
-6I+/iBHVLiCVv0wUF3jD/T+HxinEQrB4cQsSgKmfPClrc8n7rkWWE+MdwEL4VZCH
-ufabw178aYibVvJ8k3rushjLlftkDyCNno2rz8YWrnaxabVR0EqSPInyYQenmv2r
-/CedVKpmdH2RV8ubkwqa0s6cmpRkyu6FS2g3LviJhmm0nwQ=
-----END CERTIFICATE-----
--- a/integration_test/keypair/testdata/server.csr
+++ b/integration_test/keypair/testdata/server.csr
@@ -1,17 +0,0 @@
-----BEGIN CERTIFICATE REQUEST-----
-MIICrTCCAZUCAQAwFDESMBAGA1UEAwwJbG9jYWxob3N0MIIBIjANBgkqhkiG9w0B
-AQEFAAOCAQ8AMIIBCgKCAQEA3CJvDbbiiY/o9lgzeABLCtZe56h2w9Dzejy02M6F
-7yVyphLtJr+/AxI8k5ErMFRitkzgIUkLn/90CZjPI3k5OnLtUAJ4XLj4gUGjziy4
-TKyVaU0XK41ZSbDAchbW349lsEgW5ZnL4qNaZeCvvbYec+RroVc6ZXCcDp4BATTk
-C3gSVF92+TzrrlbkZ5+WYVeoMpAPWDPq2zwQx4RcYlpkpI/fzLezRqjRcZJx3FDg
-kGuwwhzXfVUpxJ/DYLXZyHCKyaT7e8YIs8e7TRekOwrLCfssfhJSdWopf6aYRZFV
-+2ovP0Nggn6XJNh/g1QKo4wzJAf6v5WMc0jEvb7EuSG+nwIDAQABoFQwUgYJKoZI
-hvcNAQkOMUUwQzAJBgNVHRMEAjAAMAsGA1UdDwQEAwIF4DAUBgNVHREEDTALggls
-b2NhbGhvc3QwEwYDVR0lBAwwCgYIKwYBBQUHAwEwDQYJKoZIhvcNAQELBQADggEB
-ACUQ0j3XuUZY3fso5tEgOGVjVsTU+C4pIsEw3e1KyIB93i56ANKaq1uBLtnlWtYi
-R4RxZ3Sf08GzoEHAHpWoQ4BQ3WGDQjxSdezbudWMuNnNyvyhkh36tmmp/PLA4iZD
-Q/d1odzGWg1HMqY0/Q3hfz40MQ9IEBBm+5zKw3tLsKNIKdSdlY7Ul3Z9PUsqsOVW
-uF0LKsTMEh1CpbYnOBS2EQjComVM5kYfdQwDNh+BMok8rH7mHFYRmrwYUrU9njsM
-eoKqhLkoSu6hw1Cgd9Yru5lC541KfxsSN4Cj6rkm+Qv/5zjvIPxYZ+akSQQR9hR3
-2O9THHKqaQS0xmD+y8NjfYk=
-----END CERTIFICATE REQUEST-----
--- a/integration_test/keypair/testdata/server.key
+++ b/integration_test/keypair/testdata/server.key
@@ -1,27 +0,0 @@
-----BEGIN RSA PRIVATE KEY-----
-MIIEpAIBAAKCAQEA3CJvDbbiiY/o9lgzeABLCtZe56h2w9Dzejy02M6F7yVyphLt
-Jr+/AxI8k5ErMFRitkzgIUkLn/90CZjPI3k5OnLtUAJ4XLj4gUGjziy4TKyVaU0X
-K41ZSbDAchbW349lsEgW5ZnL4qNaZeCvvbYec+RroVc6ZXCcDp4BATTkC3gSVF92
-+TzrrlbkZ5+WYVeoMpAPWDPq2zwQx4RcYlpkpI/fzLezRqjRcZJx3FDgkGuwwhzX
-fVUpxJ/DYLXZyHCKyaT7e8YIs8e7TRekOwrLCfssfhJSdWopf6aYRZFV+2ovP0Ng
-gn6XJNh/g1QKo4wzJAf6v5WMc0jEvb7EuSG+nwIDAQABAoIBAEYvWFb4C0wurOj2
-ABrvhP2Ekaesh4kxMp+zgTlqxzsTJnWarS/gjKcPBm9KJon3La3P3tnd7y3pBXcV
-2F0IBl4DTHRpBTUS6HBVnENc8LnJgK2dHZkOLPyYtRLrA0Et+A73PQ2hNmchC+5V
-b9K9oQH0Pvim1gCHocnrSIi480hQPazO9/gnHvFtu9Tdsx9kM9jgChhh5VaR+nzM
-uw6MpUSzCri3/W6K5Hz8F1lLQcZ6o3vyyFtLPjFrWT4J1UiHqAoxuCGeWTvMbGQl
-9Cg0SMX4FLBpbIoMonhM3hb9Cw3FVRGU/1i4oF+gEIGlX/v9CPT5HAZmD59rawc8
-11x7yTECgYEA8EYVGKauLHeI1nJdCoVrWI73W1wtwt6prJbzltpoAR4tb3Qu6gBX
-JQNd+Ifhl28lK6lPnCGk/SsmfiKSp/XE4IyS1GBd2LpxWj5R50GePCg4hAzk9Xyx
-M9SJAFQw73pODgu4RWFXTCOMo9crahJ6X/O+MckHqbFqqohJ8nChGDkCgYEA6oro
-Ql/ymO7UdYCay7OlzKeg8ud6XgkZ+wkpSG/5TQ0QZWVN3aSOLztEdVfh3PAqWob0
-KgVhLmq6CYwq+HSzU92bvFqCgYUMU8tYzeRboGLxyEdAGL+EW0j8wQyZKYR5cNz4
-yM0hpM6kbJ0zZqkYVM/XfRT2RTGwTMakF/FOHZcCgYEAmf4guTriuIcoAWEstniK
-Myj16ezrO1Df6Eia+B0kuUqxDhSlmL39HDDLQmU8NYU7in8qEcQSbVwBgKgB3HoM
-42nVFR5qJ2RfD9qPPar1klKo3iExgRCYtcJKyBYtgt6dNi1WvcjEXX0PP1bBcWtE
-WUjrphbUvXKDDabp1eNPrCkCgYBOw/F2APTeyS4Oe+8AQ8eFcDIMARLGK7ZO6Oe1
-TO1jI+UCuD+rFI0vbW7zHV1brkf6+OFcj0vwo6TweeMgZ0il/IFFgvva9UyLg3nC
-Q1NGDJR4Fv1+kiqn4V4IkuuI1tVVws/F16XZzA/J7g0KB/WE3fvXJMgDuskjL36C
-D+aU5wKBgQCvEg+mJYny1QiR/mQuowX34xf4CkMl7Xq9YDH7W/3AlwuPrPNHaZjh
-SvSCz9I8vV0E4ur6atazgCblnvA/G3d4r8YYx+e1l30WJHMgoZRxxHMH74tmUPAj
-Klic16BJikSQclMeFdlJqf2UHd37eEuYnxorpep8YGP7/eN1ghHWAw==
-----END RSA PRIVATE KEY-----
--- a/integration_test/kubeconfig/testdata/dummy.yaml
+++ b/integration_test/kubeconfig/testdata/dummy.yaml
@@ -1,4 +0,0 @@
-apiVersion: v1
-current-context: dummy
-kind: Config
-preferences: {}
--- a/integration_test/oidcserver/handler/handler.go
+++ b/integration_test/oidcserver/handler/handler.go
@@ -1,148 +0,0 @@
-// Package handler provides a HTTP handler for the OpenID Connect Provider.
-package handler
-
-import (
-	"encoding/json"
-	"fmt"
-	"net/http"
-	"testing"
-
-	"golang.org/x/xerrors"
-)
-
-func New(t *testing.T, provider Provider) *Handler {
-	return &Handler{t, provider}
-}
-
-// Handler provides a HTTP handler for the OpenID Connect Provider.
-// You need to implement the Provider interface.
-// Note that this skips some security checks and is only for testing.
-type Handler struct {
-	t        *testing.T
-	provider Provider
-}
-
-func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
-	wr := &responseWriterRecorder{w, 200}
-	err := h.serveHTTP(wr, r)
-	if err == nil {
-		h.t.Logf("%d %s %s", wr.statusCode, r.Method, r.RequestURI)
-		return
-	}
-	if errResp := new(ErrorResponse); xerrors.As(err, &errResp) {
-		h.t.Logf("400 %s %s: %s", r.Method, r.RequestURI, err)
-		w.Header().Add("Content-Type", "application/json")
-		w.WriteHeader(400)
-		e := json.NewEncoder(w)
-		if err := e.Encode(errResp); err != nil {
-			h.t.Errorf("idp/handler: could not write the response: %s", err)
-		}
-		return
-	}
-	h.t.Logf("500 %s %s: %s", r.Method, r.RequestURI, err)
-	http.Error(w, err.Error(), 500)
-}
-
-type responseWriterRecorder struct {
-	http.ResponseWriter
-	statusCode int
-}
-
-func (w *responseWriterRecorder) WriteHeader(statusCode int) {
-	w.ResponseWriter.WriteHeader(statusCode)
-	w.statusCode = statusCode
-}
-
-func (h *Handler) serveHTTP(w http.ResponseWriter, r *http.Request) error {
-	m := r.Method
-	p := r.URL.Path
-	switch {
-	case m == "GET" && p == "/.well-known/openid-configuration":
-		discoveryResponse := h.provider.Discovery()
-		w.Header().Add("Content-Type", "application/json")
-		e := json.NewEncoder(w)
-		if err := e.Encode(discoveryResponse); err != nil {
-			return xerrors.Errorf("could not render json: %w", err)
-		}
-	case m == "GET" && p == "/certs":
-		certificatesResponse := h.provider.GetCertificates()
-		w.Header().Add("Content-Type", "application/json")
-		e := json.NewEncoder(w)
-		if err := e.Encode(certificatesResponse); err != nil {
-			return xerrors.Errorf("could not render json: %w", err)
-		}
-	case m == "GET" && p == "/auth":
-		q := r.URL.Query()
-		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)
-		}
-		to := fmt.Sprintf("%s?state=%s&code=%s", redirectURI, state, code)
-		http.Redirect(w, r, to, 302)
-	case m == "POST" && p == "/token":
-		if err := r.ParseForm(); err != nil {
-			return xerrors.Errorf("could not parse the form: %w", err)
-		}
-		grantType := r.Form.Get("grant_type")
-		switch grantType {
-		case "authorization_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)
-			}
-			w.Header().Add("Content-Type", "application/json")
-			e := json.NewEncoder(w)
-			if err := e.Encode(tokenResponse); err != nil {
-				return xerrors.Errorf("could not render json: %w", err)
-			}
-		case "password":
-			// 4.3. Resource Owner Password Credentials Grant
-			// https://tools.ietf.org/html/rfc6749#section-4.3
-			username, password, scope := r.Form.Get("username"), r.Form.Get("password"), r.Form.Get("scope")
-			tokenResponse, err := h.provider.AuthenticatePassword(username, password, scope)
-			if err != nil {
-				return xerrors.Errorf("authentication error: %w", err)
-			}
-			w.Header().Add("Content-Type", "application/json")
-			e := json.NewEncoder(w)
-			if err := e.Encode(tokenResponse); err != nil {
-				return xerrors.Errorf("could not render json: %w", err)
-			}
-		case "refresh_token":
-			// 12.1. Refresh Request
-			// https://openid.net/specs/openid-connect-core-1_0.html#RefreshingAccessToken
-			refreshToken := r.Form.Get("refresh_token")
-			tokenResponse, err := h.provider.Refresh(refreshToken)
-			if err != nil {
-				return xerrors.Errorf("token refresh error: %w", err)
-			}
-			w.Header().Add("Content-Type", "application/json")
-			e := json.NewEncoder(w)
-			if err := e.Encode(tokenResponse); err != nil {
-				return xerrors.Errorf("could not render json: %w", err)
-			}
-		default:
-			// 5.2. Error Response
-			// https://tools.ietf.org/html/rfc6749#section-5.2
-			return &ErrorResponse{
-				Code:        "invalid_grant",
-				Description: fmt.Sprintf("unknown grant_type %s", grantType),
-			}
-		}
-	default:
-		http.NotFound(w, r)
-	}
-	return nil
-}
--- a/integration_test/oidcserver/handler/types.go
+++ b/integration_test/oidcserver/handler/types.go
@@ -1,87 +0,0 @@
-package handler
-
-import (
-	"fmt"
-	"net/url"
-)
-
-// Provider provides discovery and authentication methods.
-// If an implemented method returns an ErrorResponse,
-// the handler will respond 400 and corresponding json of the ErrorResponse.
-// Otherwise, the handler will respond 500 and fail the current test.
-type Provider interface {
-	Discovery() *DiscoveryResponse
-	GetCertificates() *CertificatesResponse
-	AuthenticateCode(req AuthenticationRequest) (code string, err error)
-	Exchange(req TokenRequest) (*TokenResponse, error)
-	AuthenticatePassword(username, password, scope string) (*TokenResponse, error)
-	Refresh(refreshToken string) (*TokenResponse, error)
-}
-
-type DiscoveryResponse struct {
-	Issuer                            string   `json:"issuer"`
-	AuthorizationEndpoint             string   `json:"authorization_endpoint"`
-	TokenEndpoint                     string   `json:"token_endpoint"`
-	UserinfoEndpoint                  string   `json:"userinfo_endpoint"`
-	RevocationEndpoint                string   `json:"revocation_endpoint"`
-	JwksURI                           string   `json:"jwks_uri"`
-	ResponseTypesSupported            []string `json:"response_types_supported"`
-	SubjectTypesSupported             []string `json:"subject_types_supported"`
-	IDTokenSigningAlgValuesSupported  []string `json:"id_token_signing_alg_values_supported"`
-	ScopesSupported                   []string `json:"scopes_supported"`
-	TokenEndpointAuthMethodsSupported []string `json:"token_endpoint_auth_methods_supported"`
-	ClaimsSupported                   []string `json:"claims_supported"`
-	CodeChallengeMethodsSupported     []string `json:"code_challenge_methods_supported"`
-}
-
-type CertificatesResponse struct {
-	Keys []*CertificatesResponseKey `json:"keys"`
-}
-
-type CertificatesResponseKey struct {
-	Kty string `json:"kty"`
-	Alg string `json:"alg"`
-	Use string `json:"use"`
-	Kid string `json:"kid"`
-	N   string `json:"n"`
-	E   string `json:"e"`
-}
-
-// 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 {
-	AccessToken  string `json:"access_token"`
-	TokenType    string `json:"token_type"`
-	RefreshToken string `json:"refresh_token"`
-	ExpiresIn    int    `json:"expires_in"`
-	IDToken      string `json:"id_token"`
-}
-
-// ErrorResponse represents an error response described in the following section:
-// 5.2 Error Response
-// https://tools.ietf.org/html/rfc6749#section-5.2
-type ErrorResponse struct {
-	Code        string `json:"error"`
-	Description string `json:"error_description"`
-}
-
-func (err *ErrorResponse) Error() string {
-	return fmt.Sprintf("%s(%s)", err.Code, err.Description)
-}
--- a/integration_test/oidcserver/http/http.go
+++ b/integration_test/oidcserver/http/http.go
@@ -1,78 +0,0 @@
-// Package http provides a http server running on localhost for testing.
-package http
-
-import (
-	"context"
-	"net"
-	"net/http"
-	"testing"
-
-	"github.com/int128/kubelogin/integration_test/keypair"
-)
-
-type Shutdowner interface {
-	Shutdown(t *testing.T, ctx context.Context)
-}
-
-type shutdowner struct {
-	s *http.Server
-}
-
-func (s *shutdowner) Shutdown(t *testing.T, ctx context.Context) {
-	if err := s.s.Shutdown(ctx); err != nil {
-		t.Errorf("could not shutdown the server: %s", err)
-	}
-}
-
-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) {
-	t.Helper()
-	l, port := newLocalhostListener(t)
-	url := "http://localhost:" + port
-	s := &http.Server{
-		Handler: h,
-	}
-	go func() {
-		err := s.Serve(l)
-		if err != nil && err != http.ErrServerClosed {
-			t.Error(err)
-		}
-	}()
-	return url, &shutdowner{s}
-}
-
-func startTLS(t *testing.T, h http.Handler, k keypair.KeyPair) (string, *shutdowner) {
-	t.Helper()
-	l, port := newLocalhostListener(t)
-	url := "https://localhost:" + port
-	s := &http.Server{
-		Handler: h,
-	}
-	go func() {
-		err := s.ServeTLS(l, k.CertPath, k.KeyPath)
-		if err != nil && err != http.ErrServerClosed {
-			t.Error(err)
-		}
-	}()
-	return url, &shutdowner{s}
-}
-
-func newLocalhostListener(t *testing.T) (net.Listener, string) {
-	t.Helper()
-	l, err := net.Listen("tcp", "localhost:0")
-	if err != nil {
-		t.Fatalf("Could not create a listener: %s", err)
-	}
-	addr := l.Addr().String()
-	_, port, err := net.SplitHostPort(addr)
-	if err != nil {
-		t.Fatalf("Could not parse the address %s: %s", addr, err)
-	}
-	return l, port
-}
--- a/integration_test/oidcserver/server.go
+++ b/integration_test/oidcserver/server.go
@@ -1,217 +0,0 @@
-// 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
@@ -1,334 +0,0 @@
-package integration_test
-
-import (
-	"context"
-	"os"
-	"testing"
-	"time"
-
-	"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/oidcserver"
-	"github.com/int128/kubelogin/pkg/adaptors/browser"
-	"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.
-//
-// 1. Start the auth server.
-// 2. Run the Cmd.
-// 3. Open a request for the local server.
-// 4. Verify the kubeconfig.
-//
-func TestStandalone(t *testing.T) {
-	timeout := 3 * time.Second
-	now := time.Date(2020, 1, 1, 0, 0, 0, 0, time.UTC)
-
-	for name, tc := range map[string]struct {
-		keyPair keypair.KeyPair
-		args    []string
-	}{
-		"NoTLS": {},
-		"TLS": {
-			keyPair: keypair.Server,
-		},
-	} {
-		httpDriverOption := httpdriver.Option{
-			TLSConfig:    tc.keyPair.TLSConfig,
-			BodyContains: "Authenticated",
-		}
-
-		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, httpDriverOption),
-					now:                now,
-				})
-				kubeconfig.Verify(t, kubeConfigFilename, kubeconfig.AuthProviderConfig{
-					IDToken:      sv.LastTokenResponse().IDToken,
-					RefreshToken: sv.LastTokenResponse().RefreshToken,
-				})
-			})
-
-			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, httpDriverOption),
-						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, httpDriverOption),
-						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, httpDriverOption),
-						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()
-		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:                      sv.IssuerURL(),
-			IDPCertificateAuthorityData: keypair.Server.CACertBase64,
-		})
-		defer os.Remove(kubeConfigFilename)
-		runStandalone(t, ctx, standaloneConfig{
-			issuerURL:          sv.IssuerURL(),
-			kubeConfigFilename: kubeConfigFilename,
-			httpDriver:         httpdriver.New(ctx, t, httpdriver.Option{TLSConfig: keypair.Server.TLSConfig}),
-			now:                now,
-		})
-		kubeconfig.Verify(t, kubeConfigFilename, kubeconfig.AuthProviderConfig{
-			IDToken:      sv.LastTokenResponse().IDToken,
-			RefreshToken: sv.LastTokenResponse().RefreshToken,
-		})
-	})
-
-	t.Run("env_KUBECONFIG", func(t *testing.T) {
-		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:",
-			},
-			Response: oidcserver.Response{
-				IDTokenExpiry: now.Add(time.Hour),
-			},
-		})
-		defer sv.Shutdown(t, ctx)
-		kubeConfigFilename := kubeconfig.Create(t, &kubeconfig.Values{
-			Issuer: sv.IssuerURL(),
-		})
-		defer os.Remove(kubeConfigFilename)
-		setenv(t, "KUBECONFIG", kubeConfigFilename+string(os.PathListSeparator)+"kubeconfig/testdata/dummy.yaml")
-		defer unsetenv(t, "KUBECONFIG")
-		runStandalone(t, ctx, standaloneConfig{
-			issuerURL:  sv.IssuerURL(),
-			httpDriver: httpdriver.New(ctx, t, httpdriver.Option{}),
-			now:        now,
-		})
-		kubeconfig.Verify(t, kubeConfigFilename, kubeconfig.AuthProviderConfig{
-			IDToken:      sv.LastTokenResponse().IDToken,
-			RefreshToken: sv.LastTokenResponse().RefreshToken,
-		})
-	})
-
-	t.Run("ExtraScopes", 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:             "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:      sv.IssuerURL(),
-			ExtraScopes: "profile,groups",
-		})
-		defer os.Remove(kubeConfigFilename)
-		runStandalone(t, ctx, standaloneConfig{
-			issuerURL:          sv.IssuerURL(),
-			kubeConfigFilename: kubeConfigFilename,
-			httpDriver:         httpdriver.New(ctx, t, httpdriver.Option{}),
-			now:                now,
-		})
-		kubeconfig.Verify(t, kubeConfigFilename, kubeconfig.AuthProviderConfig{
-			IDToken:      sv.LastTokenResponse().IDToken,
-			RefreshToken: sv.LastTokenResponse().RefreshToken,
-		})
-	})
-}
-
-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",
-		"--kubeconfig", cfg.kubeConfigFilename,
-		"--listen-address", "127.0.0.1:0",
-	}, cfg.args...), "HEAD")
-	if exitCode != 0 {
-		t.Errorf("exit status wants 0 but %d", exitCode)
-	}
-}
-
-func setenv(t *testing.T, key, value string) {
-	t.Helper()
-	if err := os.Setenv(key, value); err != nil {
-		t.Fatalf("Could not set the env var %s=%s: %s", key, value, err)
-	}
-}
-
-func unsetenv(t *testing.T, key string) {
-	t.Helper()
-	if err := os.Unsetenv(key); err != nil {
-		t.Fatalf("Could not unset the env var %s: %s", key, err)
-	}
-}
--- a/kubeconfig/auth.go
+++ b/kubeconfig/auth.go
@@ -0,0 +1,80 @@
+package kubeconfig
+
+import (
+	"strings"
+
+	"github.com/pkg/errors"
+	"k8s.io/client-go/tools/clientcmd/api"
+)
+
+// FindOIDCAuthProvider returns the current OIDC authProvider.
+// If the context, auth-info or auth-provider does not exist, this returns an error.
+// If auth-provider is not "oidc", this returns an error.
+func FindOIDCAuthProvider(config *api.Config) (*OIDCAuthProvider, error) {
+	context := config.Contexts[config.CurrentContext]
+	if context == nil {
+		return nil, errors.Errorf("context %s does not exist", config.CurrentContext)
+	}
+	authInfo := config.AuthInfos[context.AuthInfo]
+	if authInfo == nil {
+		return nil, errors.Errorf("auth-info %s does not exist", context.AuthInfo)
+	}
+	if authInfo.AuthProvider == nil {
+		return nil, errors.Errorf("auth-provider is not set")
+	}
+	if authInfo.AuthProvider.Name != "oidc" {
+		return nil, errors.Errorf("auth-provider name is %s but must be oidc", authInfo.AuthProvider.Name)
+	}
+	return (*OIDCAuthProvider)(authInfo.AuthProvider), nil
+}
+
+// OIDCAuthProvider represents OIDC configuration in the kubeconfig.
+type OIDCAuthProvider api.AuthProviderConfig
+
+// IDPIssuerURL returns the idp-issuer-url.
+func (c *OIDCAuthProvider) IDPIssuerURL() string {
+	return c.Config["idp-issuer-url"]
+}
+
+// ClientID returns the client-id.
+func (c *OIDCAuthProvider) ClientID() string {
+	return c.Config["client-id"]
+}
+
+// ClientSecret returns the client-secret.
+func (c *OIDCAuthProvider) ClientSecret() string {
+	return c.Config["client-secret"]
+}
+
+// IDPCertificateAuthority returns the idp-certificate-authority.
+func (c *OIDCAuthProvider) IDPCertificateAuthority() string {
+	return c.Config["idp-certificate-authority"]
+}
+
+// IDPCertificateAuthorityData returns the idp-certificate-authority-data.
+func (c *OIDCAuthProvider) IDPCertificateAuthorityData() string {
+	return c.Config["idp-certificate-authority-data"]
+}
+
+// ExtraScopes returns the extra-scopes.
+func (c *OIDCAuthProvider) ExtraScopes() []string {
+	if c.Config["extra-scopes"] == "" {
+		return []string{}
+	}
+	return strings.Split(c.Config["extra-scopes"], ",")
+}
+
+// IDToken returns the id-token.
+func (c *OIDCAuthProvider) IDToken() string {
+	return c.Config["id-token"]
+}
+
+// SetIDToken replaces the id-token.
+func (c *OIDCAuthProvider) SetIDToken(idToken string) {
+	c.Config["id-token"] = idToken
+}
+
+// SetRefreshToken replaces the refresh-token.
+func (c *OIDCAuthProvider) SetRefreshToken(refreshToken string) {
+	c.Config["refresh-token"] = refreshToken
+}
--- a/dist/kubelogin.rb
+++ b/dist/kubelogin.rb
@@ -1,27 +1,15 @@
 class Kubelogin < Formula
  desc "A kubectl plugin for Kubernetes OpenID Connect authentication"
  homepage "https://github.com/int128/kubelogin"
-  baseurl = "https://github.com/int128/kubelogin/releases/download"
+  url "https://github.com/int128/kubelogin/releases/download/{{ env "VERSION" }}/kubelogin_darwin_amd64.zip"
  version "{{ env "VERSION" }}"
-  
-  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"
-    
+  sha256 "{{ .darwin_amd64_zip_sha256 }}"
  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/main.go
+++ b/main.go
@@ -2,13 +2,19 @@ package main

 import (
 	"context"
+	"log"
 	"os"

-	"github.com/int128/kubelogin/pkg/di"
+	"github.com/int128/kubelogin/adaptors/interfaces"
+	"github.com/int128/kubelogin/di"
 )

 var version = "HEAD"

 func main() {
-	os.Exit(di.NewCmd().Run(context.Background(), os.Args, version))
+	if err := di.Invoke(func(cmd adaptors.Cmd) {
+		os.Exit(cmd.Run(context.Background(), os.Args, version))
+	}); err != nil {
+		log.Fatalf("Error: %s", err)
+	}
 }
--- a/oidc-login.yaml
+++ b/oidc-login.yaml
@@ -0,0 +1,57 @@
+apiVersion: krew.googlecontainertools.github.com/v1alpha2
+kind: Plugin
+metadata:
+  name: oidc-login
+spec:
+  shortDescription: Login for OpenID Connect authentication
+  description: |
+    This plugin gets a token from the OIDC provider and writes it to the kubeconfig.
+
+    Just run:
+      % kubectl oidc-login
+
+    It opens the browser and you can log in to the provider.
+    After authentication, it gets an ID token and refresh token and writes them to the kubeconfig.
+
+  caveats: |
+    You need to setup the following components:
+      * OIDC provider
+      * Kubernetes API server
+      * Role for your group or user
+      * kubectl authentication
+
+    See https://github.com/int128/kubelogin for more.
+
+  homepage: https://github.com/int128/kubelogin
+  version: {{ env "VERSION" }}
+  platforms:
+    - uri: https://github.com/int128/kubelogin/releases/download/{{ env "VERSION" }}/kubelogin_linux_amd64.zip
+      sha256: "{{ .linux_amd64_zip_sha256 }}"
+      bin: kubelogin
+      files:
+        - from: "kubelogin"
+          to: "."
+      selector:
+        matchLabels:
+          os: linux
+          arch: amd64
+    - uri: https://github.com/int128/kubelogin/releases/download/{{ env "VERSION" }}/kubelogin_darwin_amd64.zip
+      sha256: "{{ .darwin_amd64_zip_sha256 }}"
+      bin: kubelogin
+      files:
+        - from: "kubelogin"
+          to: "."
+      selector:
+        matchLabels:
+          os: darwin
+          arch: amd64
+    - uri: https://github.com/int128/kubelogin/releases/download/{{ env "VERSION" }}/kubelogin_windows_amd64.zip
+      sha256: "{{ .windows_amd64_zip_sha256 }}"
+      bin: kubelogin.exe
+      files:
+        - from: "kubelogin.exe"
+          to: "."
+      selector:
+        matchLabels:
+          os: windows
+          arch: amd64
--- a/pkg/adaptors/browser/browser.go
+++ b/pkg/adaptors/browser/browser.go
@@ -1,33 +0,0 @@
-package browser
-
-import (
-	"os"
-
-	"github.com/google/wire"
-	"github.com/pkg/browser"
-)
-
-//go:generate mockgen -destination mock_browser/mock_browser.go github.com/int128/kubelogin/pkg/adaptors/browser Interface
-
-func init() {
-	// In credential plugin mode, some browser launcher writes a message to stdout
-	// and it may break the credential json for client-go.
-	// This prevents the browser launcher from breaking the credential json.
-	browser.Stdout = os.Stderr
-}
-
-var Set = wire.NewSet(
-	wire.Struct(new(Browser)),
-	wire.Bind(new(Interface), new(*Browser)),
-)
-
-type Interface interface {
-	Open(url string) error
-}
-
-type Browser struct{}
-
-// Open opens the default browser.
-func (*Browser) Open(url string) error {
-	return browser.OpenURL(url)
-}
--- a/pkg/adaptors/browser/mock_browser/mock_browser.go
+++ b/pkg/adaptors/browser/mock_browser/mock_browser.go
@@ -1,47 +0,0 @@
-// Code generated by MockGen. DO NOT EDIT.
-// Source: github.com/int128/kubelogin/pkg/adaptors/browser (interfaces: Interface)
-
-// Package mock_browser is a generated GoMock package.
-package mock_browser
-
-import (
-	gomock "github.com/golang/mock/gomock"
-	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
-}
-
-// Open mocks base method.
-func (m *MockInterface) Open(arg0 string) error {
-	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "Open", arg0)
-	ret0, _ := ret[0].(error)
-	return ret0
-}
-
-// Open indicates an expected call of Open.
-func (mr *MockInterfaceMockRecorder) Open(arg0 interface{}) *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Open", reflect.TypeOf((*MockInterface)(nil).Open), arg0)
-}
--- a/pkg/adaptors/certpool/cert.go
+++ b/pkg/adaptors/certpool/cert.go
@@ -1,71 +0,0 @@
-// Package certpool provides loading certificates from files or base64 encoded string.
-package certpool
-
-import (
-	"crypto/tls"
-	"crypto/x509"
-	"encoding/base64"
-	"io/ioutil"
-
-	"github.com/google/wire"
-	"golang.org/x/xerrors"
-)
-
-//go:generate mockgen -destination mock_certpool/mock_certpool.go github.com/int128/kubelogin/pkg/adaptors/certpool Interface
-
-// Set provides an implementation and interface.
-var Set = wire.NewSet(
-	wire.Value(NewFunc(New)),
-	wire.Struct(new(CertPool), "*"),
-	wire.Bind(new(Interface), new(*CertPool)),
-)
-
-type NewFunc func() Interface
-
-// New returns an instance which implements the Interface.
-func New() Interface {
-	return &CertPool{pool: x509.NewCertPool()}
-}
-
-type Interface interface {
-	AddFile(filename string) error
-	AddBase64Encoded(s string) error
-	SetRootCAs(cfg *tls.Config)
-}
-
-// CertPool represents a pool of certificates.
-type CertPool struct {
-	pool *x509.CertPool
-}
-
-// SetRootCAs sets cfg.RootCAs if it has any certificate.
-// Otherwise do nothing.
-func (p *CertPool) SetRootCAs(cfg *tls.Config) {
-	if len(p.pool.Subjects()) > 0 {
-		cfg.RootCAs = p.pool
-	}
-}
-
-// AddFile loads the certificate from the file.
-func (p *CertPool) AddFile(filename string) error {
-	b, err := ioutil.ReadFile(filename)
-	if err != nil {
-		return xerrors.Errorf("could not read %s: %w", filename, err)
-	}
-	if !p.pool.AppendCertsFromPEM(b) {
-		return xerrors.Errorf("could not append certificate from %s", filename)
-	}
-	return nil
-}
-
-// AddBase64Encoded loads the certificate from the base64 encoded string.
-func (p *CertPool) AddBase64Encoded(s string) error {
-	b, err := base64.StdEncoding.DecodeString(s)
-	if err != nil {
-		return xerrors.Errorf("could not decode base64: %w", err)
-	}
-	if !p.pool.AppendCertsFromPEM(b) {
-		return xerrors.Errorf("could not append certificate")
-	}
-	return nil
-}
--- a/pkg/adaptors/certpool/cert_test.go
+++ b/pkg/adaptors/certpool/cert_test.go
@@ -1,58 +0,0 @@
-package certpool
-
-import (
-	"crypto/tls"
-	"io/ioutil"
-	"testing"
-)
-
-func TestCertPool_AddFile(t *testing.T) {
-	t.Run("Valid", func(t *testing.T) {
-		p := New()
-		if err := p.AddFile("testdata/ca1.crt"); err != nil {
-			t.Errorf("AddFile error: %s", err)
-		}
-		var cfg tls.Config
-		p.SetRootCAs(&cfg)
-		if n := len(cfg.RootCAs.Subjects()); n != 1 {
-			t.Errorf("n wants 1 but was %d", n)
-		}
-	})
-	t.Run("Invalid", func(t *testing.T) {
-		p := New()
-		err := p.AddFile("testdata/Makefile")
-		if err == nil {
-			t.Errorf("AddFile wants an error but was nil")
-		}
-	})
-}
-
-func TestCertPool_AddBase64Encoded(t *testing.T) {
-	p := New()
-	if err := p.AddBase64Encoded(readFile(t, "testdata/ca2.crt.base64")); err != nil {
-		t.Errorf("AddBase64Encoded error: %s", err)
-	}
-	var cfg tls.Config
-	p.SetRootCAs(&cfg)
-	if n := len(cfg.RootCAs.Subjects()); n != 1 {
-		t.Errorf("n wants 1 but was %d", n)
-	}
-}
-
-func TestCertPool_SetRootCAs(t *testing.T) {
-	p := New()
-	var cfg tls.Config
-	p.SetRootCAs(&cfg)
-	if cfg.RootCAs != nil {
-		t.Errorf("cfg.RootCAs wants nil but was %+v", cfg.RootCAs)
-	}
-}
-
-func readFile(t *testing.T, filename string) string {
-	t.Helper()
-	b, err := ioutil.ReadFile(filename)
-	if err != nil {
-		t.Fatalf("ReadFile error: %s", err)
-	}
-	return string(b)
-}
--- a/pkg/adaptors/certpool/mock_certpool/mock_certpool.go
+++ b/pkg/adaptors/certpool/mock_certpool/mock_certpool.go
@@ -1,74 +0,0 @@
-// Code generated by MockGen. DO NOT EDIT.
-// Source: github.com/int128/kubelogin/pkg/adaptors/certpool (interfaces: Interface)
-
-// Package mock_certpool is a generated GoMock package.
-package mock_certpool
-
-import (
-	tls "crypto/tls"
-	gomock "github.com/golang/mock/gomock"
-	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
-}
-
-// AddBase64Encoded mocks base method.
-func (m *MockInterface) AddBase64Encoded(arg0 string) error {
-	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "AddBase64Encoded", arg0)
-	ret0, _ := ret[0].(error)
-	return ret0
-}
-
-// AddBase64Encoded indicates an expected call of AddBase64Encoded.
-func (mr *MockInterfaceMockRecorder) AddBase64Encoded(arg0 interface{}) *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "AddBase64Encoded", reflect.TypeOf((*MockInterface)(nil).AddBase64Encoded), arg0)
-}
-
-// AddFile mocks base method.
-func (m *MockInterface) AddFile(arg0 string) error {
-	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "AddFile", arg0)
-	ret0, _ := ret[0].(error)
-	return ret0
-}
-
-// AddFile indicates an expected call of AddFile.
-func (mr *MockInterfaceMockRecorder) AddFile(arg0 interface{}) *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "AddFile", reflect.TypeOf((*MockInterface)(nil).AddFile), arg0)
-}
-
-// SetRootCAs mocks base method.
-func (m *MockInterface) SetRootCAs(arg0 *tls.Config) {
-	m.ctrl.T.Helper()
-	m.ctrl.Call(m, "SetRootCAs", arg0)
-}
-
-// SetRootCAs indicates an expected call of SetRootCAs.
-func (mr *MockInterfaceMockRecorder) SetRootCAs(arg0 interface{}) *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "SetRootCAs", reflect.TypeOf((*MockInterface)(nil).SetRootCAs), arg0)
-}
--- a/pkg/adaptors/certpool/testdata/Makefile
+++ b/pkg/adaptors/certpool/testdata/Makefile
@@ -1,28 +0,0 @@
-all: ca1.crt ca1.crt.base64 ca2.crt ca2.crt.base64 ca3.crt ca3.crt.base64
-
-.PHONY: clean
-clean:
-	-rm -v *.key *.csr *.crt *.base64
-
-%.key:
-	openssl genrsa -out $@ 1024
-
-%.csr: %.key
-	openssl req \
-		-new \
-		-key $< \
-		-subj "/CN=Hello" \
-		-days 3650 \
-		-out $@
-	openssl req -noout -text -in $@
-
-%.crt: %.csr %.key
-	openssl x509 -req \
-		-signkey $*.key \
-		-in $*.csr \
-		-days 3650 \
-		-out $@
-	openssl x509 -text -in $@
-
-%.crt.base64: %.crt
-	base64 -i $< -o $@
--- a/pkg/adaptors/certpool/testdata/ca1.crt
+++ b/pkg/adaptors/certpool/testdata/ca1.crt
@@ -1,11 +0,0 @@
-----BEGIN CERTIFICATE-----
-MIIBlzCCAQACCQCDf7Inwu3vkzANBgkqhkiG9w0BAQUFADAQMQ4wDAYDVQQDDAVI
-ZWxsbzAeFw0xOTA2MjQxMDQ0NDhaFw0yOTA2MjExMDQ0NDhaMBAxDjAMBgNVBAMM
-BUhlbGxvMIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCitZv5Go16nuHDRa2u
-nT5m1Q9tkr668pnhcP0TkyjD+oEB0lUz2SJEZEvOd1XVRRrPMSXrtybo9p0TqSGp
-Ig1gORWis/j/IR1sYdFutLKhtp6k1HvUiNosdO/K8K/AbO4QPWTGBAcqg//QkMKd
-ccgLY2PYczK/t8+6C7JYEHe5AwIDAQABMA0GCSqGSIb3DQEBBQUAA4GBACkPsyme
-JFlj75fO54NH5WXZxBtoY7kV3yd5oO88BngE8ittaHuauQkkw/sC5x733SsJlPlF
-trah4CDMjq5d/okIbIJFKe7NGLi82f9zJ+o1fjDp97UvZHC0zhUx+RiEu3iZRfYM
-31Ht7QG63V5ScV3Zmi1nzfQc4jn8d40kXXcn
-----END CERTIFICATE-----
--- a/pkg/adaptors/certpool/testdata/ca1.crt.base64
+++ b/pkg/adaptors/certpool/testdata/ca1.crt.base64
@@ -1 +0,0 @@
-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
--- a/pkg/adaptors/certpool/testdata/ca2.crt
+++ b/pkg/adaptors/certpool/testdata/ca2.crt
@@ -1,11 +0,0 @@
-----BEGIN CERTIFICATE-----
-MIIBlzCCAQACCQCuudlGZuJvODANBgkqhkiG9w0BAQUFADAQMQ4wDAYDVQQDDAVI
-ZWxsbzAeFw0xOTA2MjQxMDQ0NDhaFw0yOTA2MjExMDQ0NDhaMBAxDjAMBgNVBAMM
-BUhlbGxvMIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDHnrC3q5aCXhULGTTg
-w7psUbrH3gpHEExxlw6Zj+UBZHFhxOccGYfHPvqKwfRAKfqkP6VzLdYsfF0fuMOX
-ZzFk2hB1eAdl2dsFIn4hMll+jDdo9x+7NKvAXgsFF174ZMVTW26aAME8s4OrNuZT
-Fdrp7byuUkwUbSzDC/B/ct9MFQIDAQABMA0GCSqGSIb3DQEBBQUAA4GBAGXsF0IA
-yP3g1UTLpld2P38dvMXLGN6gwn0S0oh7AQMckJ35yh8CN/2rAkBVujyvGILLhh2/
-teoIjM2BcZsrsKZ+Jkr177fRIunsd7a+v18M/3/pVvxPZdnztXspycxIacd7yVbG
-5wjN+X7rkoBLhd+BT9+W9O/i+Cu7K89JOO64
-----END CERTIFICATE-----
--- a/pkg/adaptors/certpool/testdata/ca2.crt.base64
+++ b/pkg/adaptors/certpool/testdata/ca2.crt.base64
@@ -1 +0,0 @@
-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
--- a/pkg/adaptors/certpool/testdata/ca3.crt
+++ b/pkg/adaptors/certpool/testdata/ca3.crt
@@ -1,11 +0,0 @@
-----BEGIN CERTIFICATE-----
-MIIBlzCCAQACCQDyFQsG5rDcJTANBgkqhkiG9w0BAQUFADAQMQ4wDAYDVQQDDAVI
-ZWxsbzAeFw0xOTA2MjQxMDQ0NDhaFw0yOTA2MjExMDQ0NDhaMBAxDjAMBgNVBAMM
-BUhlbGxvMIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDUBsXHnAjPL3ejyNRs
-INI0cp4Sv4HzgXmL6nypzTdEOT3UcqfvZYj3dr4FWZytxb6XgvyvIzoV++GS22cf
-arXwwv0Z6CWiJXI+WQFdsQRQoAt4ucIa046b18p6mCiHfaH98aCOq9K3sxTfNOm3
-kWAi6oFzB5C+6HalQ+rWFSVWHQIDAQABMA0GCSqGSIb3DQEBBQUAA4GBALQfsBMR
-pxD9vzTmhw+rc0HKei9QMViIC3KYPdzvCCe0lMjrWzvcmTtUyCNJm2J2GwBVfyok
-zeUskYjinppBy/ZmzpWTeqTLOoeozgAh/Jgya5cPh01BP+pPFYmcQ5wOZHK5PPSP
-jvfqMeYs8TjXJRjdBKcMuZAN/8g2Ubtn+QbM
-----END CERTIFICATE-----
--- a/pkg/adaptors/certpool/testdata/ca3.crt.base64
+++ b/pkg/adaptors/certpool/testdata/ca3.crt.base64
@@ -1 +0,0 @@
-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
--- a/pkg/adaptors/clock/clock.go
+++ b/pkg/adaptors/clock/clock.go
@@ -1,24 +0,0 @@
-// 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/authentication.go
+++ b/pkg/adaptors/cmd/authentication.go
@@ -1,87 +0,0 @@
-package cmd
-
-import (
-	"fmt"
-	"strings"
-
-	"github.com/int128/kubelogin/pkg/usecases/authentication"
-	"github.com/int128/kubelogin/pkg/usecases/authentication/authcode"
-	"github.com/int128/kubelogin/pkg/usecases/authentication/ropc"
-	"github.com/spf13/pflag"
-	"golang.org/x/xerrors"
-)
-
-type authenticationOptions struct {
-	GrantType                  string
-	ListenAddress              []string
-	ListenPort                 []int // deprecated
-	SkipOpenBrowser            bool
-	OpenURLAfterAuthentication string
-	RedirectURLHostname        string
-	AuthRequestExtraParams     map[string]string
-	Username                   string
-	Password                   string
-}
-
-// determineListenAddress returns the addresses from the flags.
-// Note that --listen-address is always given due to the default value.
-// If --listen-port is not set, it returns --listen-address.
-// If --listen-port is set, it returns the strings of --listen-port.
-func (o *authenticationOptions) determineListenAddress() []string {
-	if len(o.ListenPort) == 0 {
-		return o.ListenAddress
-	}
-	var a []string
-	for _, p := range o.ListenPort {
-		a = append(a, fmt.Sprintf("127.0.0.1:%d", p))
-	}
-	return a
-}
-
-var allGrantType = strings.Join([]string{
-	"auto",
-	"authcode",
-	"authcode-keyboard",
-	"password",
-}, "|")
-
-func (o *authenticationOptions) addFlags(f *pflag.FlagSet) {
-	f.StringVar(&o.GrantType, "grant-type", "auto", fmt.Sprintf("Authorization grant type to use. One of (%s)", allGrantType))
-	f.StringSliceVar(&o.ListenAddress, "listen-address", defaultListenAddress, "[authcode] Address to bind to the local server. If multiple addresses are set, it will try binding in order")
-	//TODO: remove the deprecated flag
-	f.IntSliceVar(&o.ListenPort, "listen-port", nil, "[authcode] deprecated: port to bind to the local server")
-	if err := f.MarkDeprecated("listen-port", "use --listen-address instead"); err != nil {
-		panic(err)
-	}
-	f.BoolVar(&o.SkipOpenBrowser, "skip-open-browser", false, "[authcode] Do not open the browser automatically")
-	f.StringVar(&o.OpenURLAfterAuthentication, "open-url-after-authentication", "", "[authcode] If set, open the URL in the browser after authentication")
-	f.StringVar(&o.RedirectURLHostname, "oidc-redirect-url-hostname", "localhost", "[authcode] Hostname of the redirect URL")
-	f.StringToStringVar(&o.AuthRequestExtraParams, "oidc-auth-request-extra-params", nil, "[authcode, authcode-keyboard] Extra query parameters to send with an authentication request")
-	f.StringVar(&o.Username, "username", "", "[password] Username for resource owner password credentials grant")
-	f.StringVar(&o.Password, "password", "", "[password] Password for resource owner password credentials grant")
-}
-
-func (o *authenticationOptions) grantOptionSet() (s authentication.GrantOptionSet, err error) {
-	switch {
-	case o.GrantType == "authcode" || (o.GrantType == "auto" && o.Username == ""):
-		s.AuthCodeBrowserOption = &authcode.BrowserOption{
-			BindAddress:                o.determineListenAddress(),
-			SkipOpenBrowser:            o.SkipOpenBrowser,
-			OpenURLAfterAuthentication: o.OpenURLAfterAuthentication,
-			RedirectURLHostname:        o.RedirectURLHostname,
-			AuthRequestExtraParams:     o.AuthRequestExtraParams,
-		}
-	case o.GrantType == "authcode-keyboard":
-		s.AuthCodeKeyboardOption = &authcode.KeyboardOption{
-			AuthRequestExtraParams: o.AuthRequestExtraParams,
-		}
-	case o.GrantType == "password" || (o.GrantType == "auto" && o.Username != ""):
-		s.ROPCOption = &ropc.Option{
-			Username: o.Username,
-			Password: o.Password,
-		}
-	default:
-		err = xerrors.Errorf("grant-type must be one of (%s)", allGrantType)
-	}
-	return
-}
--- a/pkg/adaptors/cmd/cmd.go
+++ b/pkg/adaptors/cmd/cmd.go
@@ -1,68 +0,0 @@
-package cmd
-
-import (
-	"context"
-	"runtime"
-
-	"github.com/google/wire"
-	"github.com/int128/kubelogin/pkg/adaptors/logger"
-	"github.com/spf13/cobra"
-	"k8s.io/client-go/util/homedir"
-)
-
-// Set provides an implementation and interface for Cmd.
-var Set = wire.NewSet(
-	wire.Struct(new(Cmd), "*"),
-	wire.Bind(new(Interface), new(*Cmd)),
-	wire.Struct(new(Root), "*"),
-	wire.Struct(new(GetToken), "*"),
-	wire.Struct(new(Setup), "*"),
-)
-
-type Interface interface {
-	Run(ctx context.Context, args []string, version string) int
-}
-
-var defaultListenAddress = []string{"127.0.0.1:8000", "127.0.0.1:18000"}
-var defaultTokenCacheDir = homedir.HomeDir() + "/.kube/cache/oidc-login"
-
-// Cmd provides interaction with command line interface (CLI).
-type Cmd struct {
-	Root     *Root
-	GetToken *GetToken
-	Setup    *Setup
-	Logger   logger.Interface
-}
-
-// 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 {
-	rootCmd := cmd.Root.New()
-	rootCmd.Version = version
-	rootCmd.SilenceUsage = true
-	rootCmd.SilenceErrors = true
-
-	getTokenCmd := cmd.GetToken.New()
-	rootCmd.AddCommand(getTokenCmd)
-
-	setupCmd := cmd.Setup.New()
-	rootCmd.AddCommand(setupCmd)
-
-	versionCmd := &cobra.Command{
-		Use:   "version",
-		Short: "Print the version information",
-		Args:  cobra.NoArgs,
-		Run: func(*cobra.Command, []string) {
-			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.ExecuteContext(ctx); err != nil {
-		cmd.Logger.Printf("error: %s", err)
-		cmd.Logger.V(1).Infof("stacktrace: %+v", err)
-		return 1
-	}
-	return 0
-}
--- a/pkg/adaptors/cmd/cmd_test.go
+++ b/pkg/adaptors/cmd/cmd_test.go
@@ -1,382 +0,0 @@
-package cmd
-
-import (
-	"context"
-	"testing"
-
-	"github.com/golang/mock/gomock"
-	"github.com/int128/kubelogin/pkg/testing/logger"
-	"github.com/int128/kubelogin/pkg/usecases/authentication"
-	"github.com/int128/kubelogin/pkg/usecases/authentication/authcode"
-	"github.com/int128/kubelogin/pkg/usecases/authentication/ropc"
-	"github.com/int128/kubelogin/pkg/usecases/credentialplugin"
-	"github.com/int128/kubelogin/pkg/usecases/credentialplugin/mock_credentialplugin"
-	"github.com/int128/kubelogin/pkg/usecases/standalone"
-	"github.com/int128/kubelogin/pkg/usecases/standalone/mock_standalone"
-)
-
-func TestCmd_Run(t *testing.T) {
-	const executable = "kubelogin"
-	const version = "HEAD"
-
-	t.Run("root", func(t *testing.T) {
-		tests := map[string]struct {
-			args []string
-			in   standalone.Input
-		}{
-			"Defaults": {
-				args: []string{executable},
-				in: standalone.Input{
-					GrantOptionSet: authentication.GrantOptionSet{
-						AuthCodeBrowserOption: &authcode.BrowserOption{
-							BindAddress:         defaultListenAddress,
-							RedirectURLHostname: "localhost",
-						},
-					},
-				},
-			},
-			"when --listen-port is set, it should convert the port to address": {
-				args: []string{
-					executable,
-					"--listen-port", "10080",
-					"--listen-port", "20080",
-				},
-				in: standalone.Input{
-					GrantOptionSet: authentication.GrantOptionSet{
-						AuthCodeBrowserOption: &authcode.BrowserOption{
-							BindAddress:         []string{"127.0.0.1:10080", "127.0.0.1:20080"},
-							RedirectURLHostname: "localhost",
-						},
-					},
-				},
-			},
-			"when --listen-port is set, it should ignore --listen-address flags": {
-				args: []string{
-					executable,
-					"--listen-port", "10080",
-					"--listen-port", "20080",
-					"--listen-address", "127.0.0.1:30080",
-					"--listen-address", "127.0.0.1:40080",
-				},
-				in: standalone.Input{
-					GrantOptionSet: authentication.GrantOptionSet{
-						AuthCodeBrowserOption: &authcode.BrowserOption{
-							BindAddress:         []string{"127.0.0.1:10080", "127.0.0.1:20080"},
-							RedirectURLHostname: "localhost",
-						},
-					},
-				},
-			},
-			"FullOptions": {
-				args: []string{executable,
-					"--kubeconfig", "/path/to/kubeconfig",
-					"--context", "hello.k8s.local",
-					"--user", "google",
-					"--certificate-authority", "/path/to/cacert",
-					"--certificate-authority-data", "BASE64ENCODED",
-					"--insecure-skip-tls-verify",
-					"-v1",
-					"--grant-type", "authcode",
-					"--listen-address", "127.0.0.1:10080",
-					"--listen-address", "127.0.0.1:20080",
-					"--skip-open-browser",
-					"--open-url-after-authentication", "https://example.com/success.html",
-					"--username", "USER",
-					"--password", "PASS",
-				},
-				in: standalone.Input{
-					KubeconfigFilename: "/path/to/kubeconfig",
-					KubeconfigContext:  "hello.k8s.local",
-					KubeconfigUser:     "google",
-					CACertFilename:     "/path/to/cacert",
-					CACertData:         "BASE64ENCODED",
-					SkipTLSVerify:      true,
-					GrantOptionSet: authentication.GrantOptionSet{
-						AuthCodeBrowserOption: &authcode.BrowserOption{
-							BindAddress:                []string{"127.0.0.1:10080", "127.0.0.1:20080"},
-							SkipOpenBrowser:            true,
-							OpenURLAfterAuthentication: "https://example.com/success.html",
-							RedirectURLHostname:        "localhost",
-						},
-					},
-				},
-			},
-			"GrantType=authcode-keyboard": {
-				args: []string{executable,
-					"--grant-type", "authcode-keyboard",
-				},
-				in: standalone.Input{
-					GrantOptionSet: authentication.GrantOptionSet{
-						AuthCodeKeyboardOption: &authcode.KeyboardOption{},
-					},
-				},
-			},
-			"GrantType=password": {
-				args: []string{executable,
-					"--grant-type", "password",
-					"--listen-address", "127.0.0.1:10080",
-					"--listen-address", "127.0.0.1:20080",
-					"--username", "USER",
-					"--password", "PASS",
-				},
-				in: standalone.Input{
-					GrantOptionSet: authentication.GrantOptionSet{
-						ROPCOption: &ropc.Option{
-							Username: "USER",
-							Password: "PASS",
-						},
-					},
-				},
-			},
-			"GrantType=auto": {
-				args: []string{executable,
-					"--listen-address", "127.0.0.1:10080",
-					"--listen-address", "127.0.0.1:20080",
-					"--username", "USER",
-					"--password", "PASS",
-				},
-				in: standalone.Input{
-					GrantOptionSet: authentication.GrantOptionSet{
-						ROPCOption: &ropc.Option{
-							Username: "USER",
-							Password: "PASS",
-						},
-					},
-				},
-			},
-		}
-		for name, c := range tests {
-			t.Run(name, func(t *testing.T) {
-				ctrl := gomock.NewController(t)
-				defer ctrl.Finish()
-				ctx := context.TODO()
-				mockStandalone := mock_standalone.NewMockInterface(ctrl)
-				mockStandalone.EXPECT().
-					Do(ctx, c.in)
-				cmd := Cmd{
-					Root: &Root{
-						Standalone: mockStandalone,
-						Logger:     logger.New(t),
-					},
-					Logger: logger.New(t),
-				}
-				exitCode := cmd.Run(ctx, c.args, version)
-				if exitCode != 0 {
-					t.Errorf("exitCode wants 0 but %d", exitCode)
-				}
-			})
-		}
-
-		t.Run("TooManyArgs", func(t *testing.T) {
-			ctrl := gomock.NewController(t)
-			defer ctrl.Finish()
-			cmd := Cmd{
-				Root: &Root{
-					Standalone: mock_standalone.NewMockInterface(ctrl),
-					Logger:     logger.New(t),
-				},
-				Logger: logger.New(t),
-			}
-			exitCode := cmd.Run(context.TODO(), []string{executable, "some"}, version)
-			if exitCode != 1 {
-				t.Errorf("exitCode wants 1 but %d", exitCode)
-			}
-		})
-	})
-
-	t.Run("get-token", func(t *testing.T) {
-		tests := map[string]struct {
-			args []string
-			in   credentialplugin.Input
-		}{
-			"Defaults": {
-				args: []string{executable,
-					"get-token",
-					"--oidc-issuer-url", "https://issuer.example.com",
-					"--oidc-client-id", "YOUR_CLIENT_ID",
-				},
-				in: credentialplugin.Input{
-					TokenCacheDir: defaultTokenCacheDir,
-					IssuerURL:     "https://issuer.example.com",
-					ClientID:      "YOUR_CLIENT_ID",
-					GrantOptionSet: authentication.GrantOptionSet{
-						AuthCodeBrowserOption: &authcode.BrowserOption{
-							BindAddress:         []string{"127.0.0.1:8000", "127.0.0.1:18000"},
-							RedirectURLHostname: "localhost",
-						},
-					},
-				},
-			},
-			"FullOptions": {
-				args: []string{executable,
-					"get-token",
-					"--oidc-issuer-url", "https://issuer.example.com",
-					"--oidc-client-id", "YOUR_CLIENT_ID",
-					"--oidc-client-secret", "YOUR_CLIENT_SECRET",
-					"--oidc-extra-scope", "email",
-					"--oidc-extra-scope", "profile",
-					"--certificate-authority", "/path/to/cacert",
-					"--certificate-authority-data", "BASE64ENCODED",
-					"--insecure-skip-tls-verify",
-					"-v1",
-					"--grant-type", "authcode",
-					"--listen-address", "127.0.0.1:10080",
-					"--listen-address", "127.0.0.1:20080",
-					"--skip-open-browser",
-					"--open-url-after-authentication", "https://example.com/success.html",
-					"--oidc-auth-request-extra-params", "ttl=86400",
-					"--oidc-auth-request-extra-params", "reauth=true",
-					"--username", "USER",
-					"--password", "PASS",
-				},
-				in: credentialplugin.Input{
-					TokenCacheDir:  defaultTokenCacheDir,
-					IssuerURL:      "https://issuer.example.com",
-					ClientID:       "YOUR_CLIENT_ID",
-					ClientSecret:   "YOUR_CLIENT_SECRET",
-					ExtraScopes:    []string{"email", "profile"},
-					CACertFilename: "/path/to/cacert",
-					CACertData:     "BASE64ENCODED",
-					SkipTLSVerify:  true,
-					GrantOptionSet: authentication.GrantOptionSet{
-						AuthCodeBrowserOption: &authcode.BrowserOption{
-							BindAddress:                []string{"127.0.0.1:10080", "127.0.0.1:20080"},
-							SkipOpenBrowser:            true,
-							OpenURLAfterAuthentication: "https://example.com/success.html",
-							RedirectURLHostname:        "localhost",
-							AuthRequestExtraParams:     map[string]string{"ttl": "86400", "reauth": "true"},
-						},
-					},
-				},
-			},
-			"GrantType=authcode-keyboard": {
-				args: []string{executable,
-					"get-token",
-					"--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: &authcode.KeyboardOption{
-							AuthRequestExtraParams: map[string]string{"ttl": "86400"},
-						},
-					},
-				},
-			},
-			"GrantType=password": {
-				args: []string{executable,
-					"get-token",
-					"--oidc-issuer-url", "https://issuer.example.com",
-					"--oidc-client-id", "YOUR_CLIENT_ID",
-					"--grant-type", "password",
-					"--listen-address", "127.0.0.1:10080",
-					"--listen-address", "127.0.0.1:20080",
-					"--username", "USER",
-					"--password", "PASS",
-				},
-				in: credentialplugin.Input{
-					TokenCacheDir: defaultTokenCacheDir,
-					IssuerURL:     "https://issuer.example.com",
-					ClientID:      "YOUR_CLIENT_ID",
-					GrantOptionSet: authentication.GrantOptionSet{
-						ROPCOption: &ropc.Option{
-							Username: "USER",
-							Password: "PASS",
-						},
-					},
-				},
-			},
-			"GrantType=auto": {
-				args: []string{executable,
-					"get-token",
-					"--oidc-issuer-url", "https://issuer.example.com",
-					"--oidc-client-id", "YOUR_CLIENT_ID",
-					"--listen-address", "127.0.0.1:10080",
-					"--listen-address", "127.0.0.1:20080",
-					"--username", "USER",
-					"--password", "PASS",
-				},
-				in: credentialplugin.Input{
-					TokenCacheDir: defaultTokenCacheDir,
-					IssuerURL:     "https://issuer.example.com",
-					ClientID:      "YOUR_CLIENT_ID",
-					GrantOptionSet: authentication.GrantOptionSet{
-						ROPCOption: &ropc.Option{
-							Username: "USER",
-							Password: "PASS",
-						},
-					},
-				},
-			},
-		}
-		for name, c := range tests {
-			t.Run(name, func(t *testing.T) {
-				ctrl := gomock.NewController(t)
-				defer ctrl.Finish()
-				ctx := context.TODO()
-				getToken := mock_credentialplugin.NewMockInterface(ctrl)
-				getToken.EXPECT().
-					Do(ctx, c.in)
-				cmd := Cmd{
-					Root: &Root{
-						Logger: logger.New(t),
-					},
-					GetToken: &GetToken{
-						GetToken: getToken,
-						Logger:   logger.New(t),
-					},
-					Logger: logger.New(t),
-				}
-				exitCode := cmd.Run(ctx, c.args, version)
-				if exitCode != 0 {
-					t.Errorf("exitCode wants 0 but %d", exitCode)
-				}
-			})
-		}
-
-		t.Run("MissingMandatoryOptions", func(t *testing.T) {
-			ctrl := gomock.NewController(t)
-			defer ctrl.Finish()
-			ctx := context.TODO()
-			cmd := Cmd{
-				Root: &Root{
-					Logger: logger.New(t),
-				},
-				GetToken: &GetToken{
-					GetToken: mock_credentialplugin.NewMockInterface(ctrl),
-					Logger:   logger.New(t),
-				},
-				Logger: logger.New(t),
-			}
-			exitCode := cmd.Run(ctx, []string{executable, "get-token"}, version)
-			if exitCode != 1 {
-				t.Errorf("exitCode wants 1 but %d", exitCode)
-			}
-		})
-
-		t.Run("TooManyArgs", func(t *testing.T) {
-			ctrl := gomock.NewController(t)
-			defer ctrl.Finish()
-			ctx := context.TODO()
-			cmd := Cmd{
-				Root: &Root{
-					Logger: logger.New(t),
-				},
-				GetToken: &GetToken{
-					GetToken: mock_credentialplugin.NewMockInterface(ctrl),
-					Logger:   logger.New(t),
-				},
-				Logger: logger.New(t),
-			}
-			exitCode := cmd.Run(ctx, []string{executable, "get-token", "foo"}, version)
-			if exitCode != 1 {
-				t.Errorf("exitCode wants 1 but %d", exitCode)
-			}
-		})
-	})
-}
--- a/pkg/adaptors/cmd/get_token.go
+++ b/pkg/adaptors/cmd/get_token.go
@@ -1,79 +0,0 @@
-package cmd
-
-import (
-	"github.com/int128/kubelogin/pkg/adaptors/logger"
-	"github.com/int128/kubelogin/pkg/usecases/credentialplugin"
-	"github.com/spf13/cobra"
-	"github.com/spf13/pflag"
-	"golang.org/x/xerrors"
-)
-
-// getTokenOptions represents the options for get-token command.
-type getTokenOptions struct {
-	IssuerURL             string
-	ClientID              string
-	ClientSecret          string
-	ExtraScopes           []string
-	TokenCacheDir         string
-	tlsOptions            tlsOptions
-	authenticationOptions authenticationOptions
-}
-
-func (o *getTokenOptions) addFlags(f *pflag.FlagSet) {
-	f.StringVar(&o.IssuerURL, "oidc-issuer-url", "", "Issuer URL of the provider (mandatory)")
-	f.StringVar(&o.ClientID, "oidc-client-id", "", "Client ID of the provider (mandatory)")
-	f.StringVar(&o.ClientSecret, "oidc-client-secret", "", "Client secret of the provider")
-	f.StringSliceVar(&o.ExtraScopes, "oidc-extra-scope", nil, "Scopes to request to the provider")
-	f.StringVar(&o.TokenCacheDir, "token-cache-dir", defaultTokenCacheDir, "Path to a directory for token cache")
-	o.tlsOptions.addFlags(f)
-	o.authenticationOptions.addFlags(f)
-}
-
-type GetToken struct {
-	GetToken credentialplugin.Interface
-	Logger   logger.Interface
-}
-
-func (cmd *GetToken) New() *cobra.Command {
-	var o getTokenOptions
-	c := &cobra.Command{
-		Use:   "get-token [flags]",
-		Short: "Run as a kubectl credential plugin",
-		Args: func(c *cobra.Command, args []string) error {
-			if err := cobra.NoArgs(c, args); err != nil {
-				return err
-			}
-			if o.IssuerURL == "" {
-				return xerrors.New("--oidc-issuer-url is missing")
-			}
-			if o.ClientID == "" {
-				return xerrors.New("--oidc-client-id is missing")
-			}
-			return nil
-		},
-		RunE: func(c *cobra.Command, _ []string) error {
-			grantOptionSet, err := o.authenticationOptions.grantOptionSet()
-			if err != nil {
-				return xerrors.Errorf("get-token: %w", err)
-			}
-			in := credentialplugin.Input{
-				IssuerURL:      o.IssuerURL,
-				ClientID:       o.ClientID,
-				ClientSecret:   o.ClientSecret,
-				ExtraScopes:    o.ExtraScopes,
-				CACertFilename: o.tlsOptions.CACertFilename,
-				CACertData:     o.tlsOptions.CACertData,
-				SkipTLSVerify:  o.tlsOptions.SkipTLSVerify,
-				TokenCacheDir:  o.TokenCacheDir,
-				GrantOptionSet: grantOptionSet,
-			}
-			if err := cmd.GetToken.Do(c.Context(), in); err != nil {
-				return xerrors.Errorf("get-token: %w", err)
-			}
-			return nil
-		},
-	}
-	c.Flags().SortFlags = false
-	o.addFlags(c.Flags())
-	return c
-}
--- a/pkg/adaptors/cmd/root.go
+++ b/pkg/adaptors/cmd/root.go
@@ -1,75 +0,0 @@
-package cmd
-
-import (
-	"github.com/int128/kubelogin/pkg/adaptors/kubeconfig"
-	"github.com/int128/kubelogin/pkg/adaptors/logger"
-	"github.com/int128/kubelogin/pkg/usecases/standalone"
-	"github.com/spf13/cobra"
-	"github.com/spf13/pflag"
-	"golang.org/x/xerrors"
-)
-
-const rootDescription = `Log in to the OpenID Connect provider.
-
-You need to set up the OIDC provider, role binding, Kubernetes API server and kubeconfig.
-To show the setup instruction:
-
-	kubectl oidc-login setup
-
-See https://github.com/int128/kubelogin for more.
-`
-
-// rootOptions represents the options for the root command.
-type rootOptions struct {
-	Kubeconfig            string
-	Context               string
-	User                  string
-	tlsOptions            tlsOptions
-	authenticationOptions authenticationOptions
-}
-
-func (o *rootOptions) addFlags(f *pflag.FlagSet) {
-	f.StringVar(&o.Kubeconfig, "kubeconfig", "", "Path to the kubeconfig file")
-	f.StringVar(&o.Context, "context", "", "Name of the kubeconfig context to use")
-	f.StringVar(&o.User, "user", "", "Name of the kubeconfig user to use. Prior to --context")
-	o.tlsOptions.addFlags(f)
-	o.authenticationOptions.addFlags(f)
-}
-
-type Root struct {
-	Standalone standalone.Interface
-	Logger     logger.Interface
-}
-
-func (cmd *Root) New() *cobra.Command {
-	var o rootOptions
-	c := &cobra.Command{
-		Use:   "kubelogin",
-		Short: "Log in to the OpenID Connect provider",
-		Long:  rootDescription,
-		Args:  cobra.NoArgs,
-		RunE: func(c *cobra.Command, _ []string) error {
-			grantOptionSet, err := o.authenticationOptions.grantOptionSet()
-			if err != nil {
-				return xerrors.Errorf("invalid option: %w", err)
-			}
-			in := standalone.Input{
-				KubeconfigFilename: o.Kubeconfig,
-				KubeconfigContext:  kubeconfig.ContextName(o.Context),
-				KubeconfigUser:     kubeconfig.UserName(o.User),
-				CACertFilename:     o.tlsOptions.CACertFilename,
-				CACertData:         o.tlsOptions.CACertData,
-				SkipTLSVerify:      o.tlsOptions.SkipTLSVerify,
-				GrantOptionSet:     grantOptionSet,
-			}
-			if err := cmd.Standalone.Do(c.Context(), in); err != nil {
-				return xerrors.Errorf("login: %w", err)
-			}
-			return nil
-		},
-	}
-	c.Flags().SortFlags = false
-	o.addFlags(c.Flags())
-	cmd.Logger.AddFlags(c.PersistentFlags())
-	return c
-}
--- a/pkg/adaptors/cmd/setup.go
+++ b/pkg/adaptors/cmd/setup.go
@@ -1,70 +0,0 @@
-package cmd
-
-import (
-	"github.com/int128/kubelogin/pkg/usecases/setup"
-	"github.com/spf13/cobra"
-	"github.com/spf13/pflag"
-	"golang.org/x/xerrors"
-)
-
-// setupOptions represents the options for setup command.
-type setupOptions struct {
-	IssuerURL             string
-	ClientID              string
-	ClientSecret          string
-	ExtraScopes           []string
-	tlsOptions            tlsOptions
-	authenticationOptions authenticationOptions
-}
-
-func (o *setupOptions) addFlags(f *pflag.FlagSet) {
-	f.StringVar(&o.IssuerURL, "oidc-issuer-url", "", "Issuer URL of the provider")
-	f.StringVar(&o.ClientID, "oidc-client-id", "", "Client ID of the provider")
-	f.StringVar(&o.ClientSecret, "oidc-client-secret", "", "Client secret of the provider")
-	f.StringSliceVar(&o.ExtraScopes, "oidc-extra-scope", nil, "Scopes to request to the provider")
-	o.tlsOptions.addFlags(f)
-	o.authenticationOptions.addFlags(f)
-}
-
-type Setup struct {
-	Setup setup.Interface
-}
-
-func (cmd *Setup) New() *cobra.Command {
-	var o setupOptions
-	c := &cobra.Command{
-		Use:   "setup",
-		Short: "Show the setup instruction",
-		Args:  cobra.NoArgs,
-		RunE: func(c *cobra.Command, _ []string) error {
-			grantOptionSet, err := o.authenticationOptions.grantOptionSet()
-			if err != nil {
-				return xerrors.Errorf("setup: %w", err)
-			}
-			in := setup.Stage2Input{
-				IssuerURL:      o.IssuerURL,
-				ClientID:       o.ClientID,
-				ClientSecret:   o.ClientSecret,
-				ExtraScopes:    o.ExtraScopes,
-				CACertFilename: o.tlsOptions.CACertFilename,
-				CACertData:     o.tlsOptions.CACertData,
-				SkipTLSVerify:  o.tlsOptions.SkipTLSVerify,
-				GrantOptionSet: grantOptionSet,
-			}
-			if c.Flags().Lookup("listen-address").Changed {
-				in.ListenAddressArgs = o.authenticationOptions.ListenAddress
-			}
-			if in.IssuerURL == "" || in.ClientID == "" {
-				cmd.Setup.DoStage1()
-				return nil
-			}
-			if err := cmd.Setup.DoStage2(c.Context(), in); err != nil {
-				return xerrors.Errorf("setup: %w", err)
-			}
-			return nil
-		},
-	}
-	c.Flags().SortFlags = false
-	o.addFlags(c.Flags())
-	return c
-}
--- a/pkg/adaptors/cmd/tls.go
+++ b/pkg/adaptors/cmd/tls.go
@@ -1,15 +0,0 @@
-package cmd
-
-import "github.com/spf13/pflag"
-
-type tlsOptions struct {
-	CACertFilename string
-	CACertData     string
-	SkipTLSVerify  bool
-}
-
-func (o *tlsOptions) addFlags(f *pflag.FlagSet) {
-	f.StringVar(&o.CACertFilename, "certificate-authority", "", "Path to a cert file for the certificate authority")
-	f.StringVar(&o.CACertData, "certificate-authority-data", "", "Base64 encoded cert for the certificate authority")
-	f.BoolVar(&o.SkipTLSVerify, "insecure-skip-tls-verify", false, "If set, the server's certificate will not be checked for validity. This will make your HTTPS connections insecure")
-}
--- a/pkg/adaptors/credentialpluginwriter/credential_plugin.go
+++ b/pkg/adaptors/credentialpluginwriter/credential_plugin.go
@@ -1,53 +0,0 @@
-// Package credentialpluginwriter provides a writer for a credential plugin.
-package credentialpluginwriter
-
-import (
-	"encoding/json"
-	"time"
-
-	"github.com/google/wire"
-	"github.com/int128/kubelogin/pkg/adaptors/stdio"
-	"golang.org/x/xerrors"
-	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
-
-var Set = wire.NewSet(
-	wire.Struct(new(Writer), "*"),
-	wire.Bind(new(Interface), new(*Writer)),
-)
-
-type Interface interface {
-	Write(out Output) error
-}
-
-// Output represents an output object of the credential plugin.
-type Output struct {
-	Token  string
-	Expiry time.Time
-}
-
-type Writer struct {
-	Stdout stdio.Stdout
-}
-
-// Write writes the ExecCredential to standard output for kubectl.
-func (w *Writer) Write(out Output) error {
-	ec := &clientauthenticationv1beta1.ExecCredential{
-		TypeMeta: metav1.TypeMeta{
-			APIVersion: "client.authentication.k8s.io/v1beta1",
-			Kind:       "ExecCredential",
-		},
-		Status: &clientauthenticationv1beta1.ExecCredentialStatus{
-			Token:               out.Token,
-			ExpirationTimestamp: &metav1.Time{Time: out.Expiry},
-		},
-	}
-	e := json.NewEncoder(w.Stdout)
-	if err := e.Encode(ec); err != nil {
-		return xerrors.Errorf("could not write the ExecCredential: %w", err)
-	}
-	return nil
-}
--- a/pkg/adaptors/credentialpluginwriter/mock_credentialpluginwriter/mock_credentialpluginwriter.go
+++ b/pkg/adaptors/credentialpluginwriter/mock_credentialpluginwriter/mock_credentialpluginwriter.go
@@ -1,48 +0,0 @@
-// Code generated by MockGen. DO NOT EDIT.
-// Source: github.com/int128/kubelogin/pkg/adaptors/credentialpluginwriter (interfaces: Interface)
-
-// Package mock_credentialpluginwriter is a generated GoMock package.
-package mock_credentialpluginwriter
-
-import (
-	gomock "github.com/golang/mock/gomock"
-	credentialpluginwriter "github.com/int128/kubelogin/pkg/adaptors/credentialpluginwriter"
-	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
-}
-
-// Write mocks base method.
-func (m *MockInterface) Write(arg0 credentialpluginwriter.Output) error {
-	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "Write", arg0)
-	ret0, _ := ret[0].(error)
-	return ret0
-}
-
-// Write indicates an expected call of Write.
-func (mr *MockInterfaceMockRecorder) Write(arg0 interface{}) *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Write", reflect.TypeOf((*MockInterface)(nil).Write), arg0)
-}
--- a/pkg/adaptors/kubeconfig/kubeconfig.go
+++ b/pkg/adaptors/kubeconfig/kubeconfig.go
@@ -1,45 +0,0 @@
-package kubeconfig
-
-import (
-	"github.com/google/wire"
-	"github.com/int128/kubelogin/pkg/adaptors/logger"
-)
-
-//go:generate mockgen -destination mock_kubeconfig/mock_kubeconfig.go github.com/int128/kubelogin/pkg/adaptors/kubeconfig Interface
-
-// Set provides an implementation and interface for Kubeconfig.
-var Set = wire.NewSet(
-	wire.Struct(new(Kubeconfig), "*"),
-	wire.Bind(new(Interface), new(*Kubeconfig)),
-)
-
-type Interface interface {
-	GetCurrentAuthProvider(explicitFilename string, contextName ContextName, userName UserName) (*AuthProvider, error)
-	UpdateAuthProvider(auth *AuthProvider) error
-}
-
-// ContextName represents name of a context.
-type ContextName string
-
-// UserName represents name of a user.
-type UserName string
-
-// AuthProvider represents the authentication provider,
-// i.e. context, user and auth-provider in a kubeconfig.
-type AuthProvider struct {
-	LocationOfOrigin            string      // Path to the kubeconfig file which contains the user
-	UserName                    UserName    // User name
-	ContextName                 ContextName // (optional) Context name
-	IDPIssuerURL                string      // idp-issuer-url
-	ClientID                    string      // client-id
-	ClientSecret                string      // (optional) client-secret
-	IDPCertificateAuthority     string      // (optional) idp-certificate-authority
-	IDPCertificateAuthorityData string      // (optional) idp-certificate-authority-data
-	ExtraScopes                 []string    // (optional) extra-scopes
-	IDToken                     string      // (optional) id-token
-	RefreshToken                string      // (optional) refresh-token
-}
-
-type Kubeconfig struct {
-	Logger logger.Interface
-}
--- a/pkg/adaptors/kubeconfig/load.go
+++ b/pkg/adaptors/kubeconfig/load.go
@@ -1,80 +0,0 @@
-package kubeconfig
-
-import (
-	"strings"
-
-	"golang.org/x/xerrors"
-	"k8s.io/client-go/tools/clientcmd"
-	"k8s.io/client-go/tools/clientcmd/api"
-)
-
-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 the kubeconfig: %w", err)
-	}
-	auth, err := findCurrentAuthProvider(config, contextName, userName)
-	if err != nil {
-		return nil, xerrors.Errorf("could not find the current auth provider: %w", err)
-	}
-	return auth, nil
-}
-
-func loadByDefaultRules(explicitFilename string) (*api.Config, error) {
-	rules := clientcmd.NewDefaultClientConfigLoadingRules()
-	rules.ExplicitPath = explicitFilename
-	config, err := rules.Load()
-	if err != nil {
-		return nil, xerrors.Errorf("load error: %w", err)
-	}
-	return config, err
-}
-
-// findCurrentAuthProvider resolves the current auth provider.
-// If contextName is given, this returns the user of the context.
-// If userName is given, this ignores the context and returns the user.
-// If any context or user is not found, this returns an error.
-func findCurrentAuthProvider(config *api.Config, contextName ContextName, userName UserName) (*AuthProvider, error) {
-	if userName == "" {
-		if contextName == "" {
-			contextName = ContextName(config.CurrentContext)
-		}
-		contextNode, ok := config.Contexts[string(contextName)]
-		if !ok {
-			return nil, xerrors.Errorf("context %s does not exist", contextName)
-		}
-		userName = UserName(contextNode.AuthInfo)
-	}
-	userNode, ok := config.AuthInfos[string(userName)]
-	if !ok {
-		return nil, xerrors.Errorf("user %s does not exist", userName)
-	}
-	if userNode.AuthProvider == nil {
-		return nil, xerrors.New("auth-provider is missing")
-	}
-	if userNode.AuthProvider.Name != "oidc" {
-		return nil, xerrors.Errorf("auth-provider.name must be oidc but is %s", userNode.AuthProvider.Name)
-	}
-	if userNode.AuthProvider.Config == nil {
-		return nil, xerrors.New("auth-provider.config is missing")
-	}
-
-	m := userNode.AuthProvider.Config
-	var extraScopes []string
-	if m["extra-scopes"] != "" {
-		extraScopes = strings.Split(m["extra-scopes"], ",")
-	}
-	return &AuthProvider{
-		LocationOfOrigin:            userNode.LocationOfOrigin,
-		UserName:                    userName,
-		ContextName:                 contextName,
-		IDPIssuerURL:                m["idp-issuer-url"],
-		ClientID:                    m["client-id"],
-		ClientSecret:                m["client-secret"],
-		IDPCertificateAuthority:     m["idp-certificate-authority"],
-		IDPCertificateAuthorityData: m["idp-certificate-authority-data"],
-		ExtraScopes:                 extraScopes,
-		IDToken:                     m["id-token"],
-		RefreshToken:                m["refresh-token"],
-	}, nil
-}
--- a/Show More
+++ b/Show More
Author	SHA1	Message	Date
Hidetake Iwata	fc31d467e4	Dump all claims of ID token to debug log (#68 ) * Dump all claims of ID token to debug log * Add dump when a user already has a token	2019-04-19 10:47:32 +09:00
Hidetake Iwata	6ae8e36683	Fix error of go get and remove golint (#69 ) * Remove golint * Fix error of go get github.com/int128/ghcp	2019-04-19 10:46:07 +09:00
				`@@ -1 +0,0 @@`
				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