Update feature_request.md

Co-authored-by: Renovate Bot <bot@renovateapp.com>

.circleci/Makefile

@@ -0,0 +1,16 @@
+.PHONY: all
+all:
+
+.PHONY: install-test-deps
+install-test-deps:
+	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

.circleci/config.yml

@@ -1,27 +1,60 @@
-version: 2
+version: 2.1
+
 jobs:
-  build:
+  test:
     docker:
-      - image: circleci/golang:1.13.4
+      - image: cimg/go:1.15.2
     steps:
-      - run: mkdir -p ~/bin
-      - run: echo 'export PATH="$HOME/bin:$PATH"' >> $BASH_ENV
       - checkout
-      - run: make ci-setup-linux-amd64
-      - run: make VERSION=$CIRCLE_TAG ci
-      - run: |
-          if [ "$CIRCLE_TAG" ]; then
-            make VERSION=$CIRCLE_TAG GITHUB_USERNAME=$CIRCLE_PROJECT_USERNAME GITHUB_REPONAME=$CIRCLE_PROJECT_REPONAME release
-          fi
+      - restore_cache:
+          keys:
+            - go-sum-{{ checksum "go.sum" }}
+      - run: make -C .circleci install-test-deps
+      - 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"' >> $BASH_ENV
+      - checkout
+      - restore_cache:
+          keys:
+            - go-macos-{{ checksum "go.sum" }}
+      - run: make -C .circleci install-release-deps
+      - run: make dist
+      - run: |
+          if [ "$CIRCLE_TAG" ]; then
+            make release
+          fi
+      - save_cache:
+          key: go-macos-{{ checksum "go.sum" }}
+          paths:
+            - ~/go/pkg
+
 workflows:
   version: 2
-  all:
+  build:
     jobs:
-      - build:
-          context: open-source
+      - test:
           filters:
             tags:
-              only: /.*/
+              only: /^v.*/
+      - release:
+          context: open-source
+          requires:
+            - test
+          filters:
+            branches:
+              only: /^release-feature.*/
+            tags:
+              only: /^v.*/

.circleci/go.mod

@@ -0,0 +1,3 @@
+module github.com/int128/kubelogin/.circleci
+
+go 1.13

.circleci/go_version_from_config.rb

@@ -0,0 +1,11 @@
+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)

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,20 @@
+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+## Describe the issue
+A clear and concise description of what the issue is.
+
+## To reproduce
+A console log or steps to reproduce the issue.
+
+## Your environment
+- OS: e.g. macOS
+- kubelogin version: e.g. v1.19
+- kubectl version: e.g. v1.19
+- OpenID Connect provider: e.g. Google

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,15 @@
+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+## Purpose of the feature (why)
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+A clear and concise description of what you want to happen.
+
+## Your idea (how)
+A clear and concise description of any alternative solutions or features you've considered.

.github/renovate.json

@@ -0,0 +1,8 @@
+{
+  "extends": [
+    "config:base"
+  ],
+  "postUpdateOptions": [
+    "gomodTidy"
+  ]
+}

.github/workflows/acceptance-test.yaml

@@ -1,30 +0,0 @@
-name: acceptance-test
-on: [push]
-jobs:
-  build:
-    name: test
-    # https://help.github.com/en/actions/automating-your-workflow-with-github-actions/software-installed-on-github-hosted-runners#ubuntu-1804-lts
-    runs-on: ubuntu-18.04
-    steps:
-      - uses: actions/setup-go@v1
-        with:
-          go-version: 1.13
-        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/v0.7.0/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 install -y libnss3-tools
-      - run: echo '127.0.0.1 dex-server' | sudo tee -a /etc/hosts
-      - run: make -C acceptance_test -j3 setup
-      - run: make -C acceptance_test test

.github/workflows/golangci-lint.yaml

@@ -0,0 +1,14 @@
+on:
+  push:
+    paths:
+      - .github/workflows/golangci-lint.yaml
+      - '**.go'
+jobs:
+  golangci:
+    name: lint
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: golangci/golangci-lint-action@v2
+        with:
+          version: v1.30

.github/workflows/system-test.yaml

@@ -0,0 +1,29 @@
+on:
+  push:
+    paths: 
+      - .github/workflows/system-test.yaml
+      - system_test/**
+      - pkg/**
+      - go.*
+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@v2
+        with:
+          go-version: 1.15
+        id: go
+      - uses: actions/checkout@v2
+      - uses: actions/cache@v2
+        with:
+          path: ~/go/pkg/mod
+          key: go-${{ hashFiles('**/go.sum') }}
+          restore-keys: |
+            go-
+      # https://packages.ubuntu.com/xenial/libnss3-tools
+      - run: sudo apt update
+      - run: sudo apt install -y libnss3-tools
+      - run: mkdir -p ~/.pki/nssdb
+      - run: echo '127.0.0.1 dex-server' | sudo tee -a /etc/hosts
+      - run: make -C system_test -j3

.gitignore

@@ -8,3 +8,5 @@
 
 /kubelogin
 /kubectl-oidc_login
+
+/.circleci/go/

Makefile

@@ -1,10 +1,11 @@
-# CI must provide the following variables (on tag push)
-# VERSION
-# GITHUB_USERNAME
-# GITHUB_REPONAME
+# CircleCI specific variables
+CIRCLE_TAG ?= latest
+GITHUB_USERNAME := $(CIRCLE_PROJECT_USERNAME)
+GITHUB_REPONAME := $(CIRCLE_PROJECT_REPONAME)
 
 TARGET := kubelogin
-VERSION ?= latest
+TARGET_OSARCH := linux_amd64 darwin_amd64 windows_amd64 linux_arm linux_arm64
+VERSION ?= $(CIRCLE_TAG)
 LDFLAGS := -X main.version=$(VERSION)
 
 all: $(TARGET)
@@ -12,22 +13,15 @@ all: $(TARGET)
 $(TARGET): $(wildcard **/*.go)
 	go build -o $@ -ldflags "$(LDFLAGS)"
 
-.PHONY: ci
-ci:
-	$(MAKE) check
-	bash -c "bash <(curl -s https://codecov.io/bash)"
-	$(MAKE) dist
-
 .PHONY: check
 check:
-	golangci-lint run
 	go test -v -race -cover -coverprofile=coverage.out ./... > gotest.log
 
 .PHONY: dist
 dist: dist/output
 dist/output:
 	# make the zip files for GitHub Releases
-	VERSION=$(VERSION) CGO_ENABLED=0 goxzst -d dist/output -i "LICENSE" -o "$(TARGET)" -t "dist/kubelogin.rb dist/oidc-login.yaml dist/Dockerfile" -- -ldflags "$(LDFLAGS)"
+	VERSION=$(VERSION) goxzst -d dist/output -i "LICENSE" -o "$(TARGET)" -osarch "$(TARGET_OSARCH)" -t "dist/kubelogin.rb dist/oidc-login.yaml dist/Dockerfile" -- -ldflags "$(LDFLAGS)"
 	# test the zip file
 	zipinfo dist/output/kubelogin_linux_amd64.zip
 	# make the krew yaml structure
@@ -52,15 +46,3 @@ clean:
 	-rm $(TARGET)
 	-rm -r dist/output/
 	-rm coverage.out gotest.log
-
-.PHONY: ci-setup-linux-amd64
-ci-setup-linux-amd64:
-	mkdir -p ~/bin
-	# https://github.com/golangci/golangci-lint
-	curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | sh -s -- -b ~/bin v1.21.0
-	# https://github.com/int128/goxzst
-	curl -sfL -o /tmp/goxzst.zip https://github.com/int128/goxzst/releases/download/v0.3.0/goxzst_linux_amd64.zip
-	unzip /tmp/goxzst.zip -d ~/bin
-	# https://github.com/int128/ghcp
-	curl -sfL -o /tmp/ghcp.zip https://github.com/int128/ghcp/releases/download/v1.8.0/ghcp_linux_amd64.zip
-	unzip /tmp/ghcp.zip -d ~/bin

README.md

@@ -1,10 +1,10 @@
-# kubelogin [![CircleCI](https://circleci.com/gh/int128/kubelogin.svg?style=shield)](https://circleci.com/gh/int128/kubelogin) ![acceptance-test](https://github.com/int128/kubelogin/workflows/acceptance-test/badge.svg) [![Go Report Card](https://goreportcard.com/badge/github.com/int128/kubelogin)](https://goreportcard.com/report/github.com/int128/kubelogin)
+# kubelogin [![CircleCI](https://circleci.com/gh/int128/kubelogin.svg?style=shield)](https://circleci.com/gh/int128/kubelogin) [![Go Report Card](https://goreportcard.com/badge/github.com/int128/kubelogin)](https://goreportcard.com/report/github.com/int128/kubelogin)
 
 This is a kubectl plugin for [Kubernetes OpenID Connect (OIDC) authentication](https://kubernetes.io/docs/reference/access-authn-authz/authentication/#openid-connect-tokens), also known as `kubectl oidc-login`.
 
 Here is an example of Kubernetes authentication with the Google Identity Platform:
 
-<img alt="screencast" src="https://user-images.githubusercontent.com/321266/70971501-7bcebc80-20e4-11ea-8afc-539dcaea0aa8.gif" width="652" height="455">
+<img alt="screencast" src="https://user-images.githubusercontent.com/321266/85427290-86e43700-b5b6-11ea-9e97-ffefd736c9b7.gif" width="572" height="391">
 
 Kubelogin is designed to run as a [client-go credential plugin](https://kubernetes.io/docs/reference/access-authn-authz/authentication/#client-go-credential-plugins).
 When you run kubectl, kubelogin opens the browser and you can log in to the provider.
@@ -18,22 +18,17 @@ Take a look at the diagram:
 
 ### Setup
 
-Install the latest release from [Homebrew](https://brew.sh/), [Krew](https://github.com/kubernetes-sigs/krew) or [GitHub Releases](https://github.com/int128/kubelogin/releases) as follows:
+Install the latest release from [Homebrew](https://brew.sh/), [Krew](https://github.com/kubernetes-sigs/krew), [Chocolatey](https://chocolatey.org/packages/kubelogin) or [GitHub Releases](https://github.com/int128/kubelogin/releases).
 
 ```sh
-# Homebrew
+# Homebrew (macOS and Linux)
 brew install int128/kubelogin/kubelogin
 
-# Krew
+# Krew (macOS, Linux, Windows and ARM)
 kubectl krew install oidc-login
 
-# GitHub Releases
-curl -LO https://github.com/int128/kubelogin/releases/download/v1.16.0/kubelogin_linux_amd64.zip
-unzip kubelogin_linux_amd64.zip
-ln -s kubelogin kubectl-oidc_login
-
-# Docker
-docker run --rm quay.io/int128/kubelogin:v1.16.0
+# Chocolatey (Windows)
+choco install kubelogin
 ```
 
 You need to set up the OIDC provider, cluster role binding, Kubernetes API server and kubeconfig.
@@ -54,7 +49,7 @@ users:
       - --oidc-client-secret=YOUR_CLIENT_SECRET
 ```
 
-See [the setup guide](docs/setup.md) for more.
+See [setup guide](docs/setup.md) for more.
 
 
 ### Run
@@ -66,7 +61,7 @@ kubectl get pods
 ```
 
 Kubectl executes kubelogin before calling the Kubernetes APIs.
-Kubelogin automatically opens the browser and you can log in to the provider.
+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">
 
@@ -91,199 +86,29 @@ If the refresh token has expired, kubelogin will perform reauthentication.
 You can log out by removing the token cache directory (default `~/.kube/cache/oidc-login`).
 Kubelogin will perform authentication if the token cache file does not exist.
 
-You can dump the claims of token by passing `-v1` option.
+You can dump claims of an ID token by `setup` command.
 
-```
-I0221 21:54:08.151850   28231 get_token.go:104] you got a token: {
+```console
+% kubectl oidc-login setup --oidc-issuer-url https://accounts.google.com --oidc-client-id REDACTED --oidc-client-secret REDACTED
+...
+You got a token with the following claims:
+
+{
   "sub": "********",
   "iss": "https://accounts.google.com",
   "aud": "********",
-  "iat": 1582289639,
-  "exp": 1582293239,
-  "jti": "********",
-  "nonce": "********",
-  "at_hash": "********"
+  ...
 }
 ```
 
+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).
+## Docs
 
-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
-      --certificate-authority string        Path to a cert file for the certificate authority
-      --certificate-authority-data string   Base64 encoded data for the certificate authority
-      --insecure-skip-tls-verify            If true, the server's certificate will not be checked for validity. This will make your HTTPS connections insecure
-      --token-cache-dir string              Path to a directory for caching tokens (default "~/.kube/cache/oidc-login")
-      --grant-type string                   The authorization grant type to use. One of (auto|authcode|authcode-keyboard|password) (default "auto")
-      --listen-address strings              Address to bind to the local server. If multiple addresses are given, it will try binding in order (default [127.0.0.1:8000,127.0.0.1:18000])
-      --listen-port ints                    (Deprecated: use --listen-address)
-      --skip-open-browser                   If true, it does not open the browser on authentication
-      --username string                     If set, perform the resource owner password credentials grant
-      --password string                     If set, use the password instead of asking it
-  -h, --help                                help for get-token
-
-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`.
-
-```yaml
-      - --oidc-extra-scope=email
-      - --oidc-extra-scope=profile
-```
-
-### CA Certificate
-
-You can use your self-signed certificate for the provider.
-
-```yaml
-      - --certificate-authority=/home/user/.kube/keycloak-ca.pem
-      - --certificate-authority-data=LS0t...
-```
-
-### 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).
-
-### Docker
-
-You can run [the Docker image](https://quay.io/repository/int128/kubelogin) instead of the binary.
-The kubeconfig looks like:
-
-```yaml
-users:
-- name: oidc
-  user:
-    exec:
-      apiVersion: client.authentication.k8s.io/v1beta1
-      command: docker
-      args:
-      - run
-      - --rm
-      - -v
-      - /tmp/.token-cache:/.token-cache
-      - -p
-      - 8000:8000
-      - quay.io/int128/kubelogin:v1.16.0
-      - get-token
-      - --token-cache-dir=/.token-cache
-      - --listen-address=0.0.0.0:8000
-      - --oidc-issuer-url=ISSUER_URL
-      - --oidc-client-id=YOUR_CLIENT_ID
-      - --oidc-client-secret=YOUR_CLIENT_SECRET
-```
-
-Known limitations:
-
-- It cannot open the browser automatically.
-- The container port and listen port must be equal for consistency of the redirect URI.
-
-### Authentication flows
-
-#### Authorization code flow
-
-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
-```
-
-#### 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.
-
-#### 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:
-```
+- [Setup guide](docs/setup.md)
+- [Usage and options](docs/usage.md)
+- [Standalone mode](docs/standalone-mode.md) (deprecated)
 
 
 ## Related works
@@ -311,4 +136,6 @@ make
 ./kubelogin
 ```
 
-See also [the acceptance test](acceptance_test).
+### System test
+
+See [system test](system_test) for more.

acceptance_test/Makefile

@@ -1,99 +1,31 @@
 CLUSTER_NAME := kubelogin-acceptance-test
 OUTPUT_DIR := $(CURDIR)/output
 
-PATH := $(PATH):$(OUTPUT_DIR)/bin
-export PATH
 KUBECONFIG := $(OUTPUT_DIR)/kubeconfig.yaml
 export KUBECONFIG
 
-# run the login script instead of opening chrome
-BROWSER := $(OUTPUT_DIR)/bin/chromelogin
-export BROWSER
-
-.PHONY: test
-test: build
-	# see the setup instruction
-	kubectl oidc-login setup \
-		--oidc-issuer-url=https://dex-server:10443/dex \
-		--oidc-client-id=YOUR_CLIENT_ID \
-		--oidc-client-secret=YOUR_CLIENT_SECRET \
-		--oidc-extra-scope=email \
-		--certificate-authority=$(OUTPUT_DIR)/ca.crt
-	# set up the kubeconfig
-	kubectl config set-credentials oidc \
-		--exec-api-version=client.authentication.k8s.io/v1beta1 \
-		--exec-command=kubectl \
-		--exec-arg=oidc-login \
-		--exec-arg=get-token \
-		--exec-arg=--oidc-issuer-url=https://dex-server:10443/dex \
-		--exec-arg=--oidc-client-id=YOUR_CLIENT_ID \
-		--exec-arg=--oidc-client-secret=YOUR_CLIENT_SECRET \
-		--exec-arg=--oidc-extra-scope=email \
-		--exec-arg=--certificate-authority=$(OUTPUT_DIR)/ca.crt
-	# make sure we can access the cluster
-	kubectl --user=oidc cluster-info
-	# switch the current context
-	kubectl config set-context --current --user=oidc
-	# make sure we can access the cluster
-	kubectl cluster-info
-
-.PHONY: setup
-setup: build dex cluster setup-chrome
-
-.PHONY: setup-chrome
-setup-chrome: $(OUTPUT_DIR)/ca.crt
-	# add the dex server certificate to the trust store
-	mkdir -p ~/.pki/nssdb
-	cd ~/.pki/nssdb && certutil -A -d sql:. -n dex -i $(OUTPUT_DIR)/ca.crt -t "TC,,"
-
-# build binaries
-.PHONY: build
-build: $(OUTPUT_DIR)/bin/kubectl-oidc_login $(OUTPUT_DIR)/bin/chromelogin
-$(OUTPUT_DIR)/bin/kubectl-oidc_login:
-	go build -o $@ ..
-$(OUTPUT_DIR)/bin/chromelogin: chromelogin/main.go
-	go build -o $@ ./chromelogin
-
-# create a Dex server
-.PHONY: dex
-dex: $(OUTPUT_DIR)/server.crt $(OUTPUT_DIR)/server.key
-	docker create --name dex-server -p 10443:10443 quay.io/dexidp/dex:v2.21.0 serve /dex.yaml
-	docker cp $(OUTPUT_DIR)/server.crt dex-server:/
-	docker cp $(OUTPUT_DIR)/server.key dex-server:/
-	docker cp dex.yaml dex-server:/
-	docker start dex-server
-	docker logs dex-server
-
-$(OUTPUT_DIR)/ca.key:
-	mkdir -p $(OUTPUT_DIR)
-	openssl genrsa -out $@ 2048
-$(OUTPUT_DIR)/ca.csr: $(OUTPUT_DIR)/ca.key
-	openssl req -new -key $(OUTPUT_DIR)/ca.key -out $@ -subj "/CN=dex-ca" -config openssl.cnf
-$(OUTPUT_DIR)/ca.crt: $(OUTPUT_DIR)/ca.key $(OUTPUT_DIR)/ca.csr
-	openssl x509 -req -in $(OUTPUT_DIR)/ca.csr -signkey $(OUTPUT_DIR)/ca.key -out $@ -days 10
-$(OUTPUT_DIR)/server.key:
-	mkdir -p $(OUTPUT_DIR)
-	openssl genrsa -out $@ 2048
-$(OUTPUT_DIR)/server.csr: openssl.cnf $(OUTPUT_DIR)/server.key
-	openssl req -new -key $(OUTPUT_DIR)/server.key -out $@ -subj "/CN=dex-server" -config openssl.cnf
-$(OUTPUT_DIR)/server.crt: openssl.cnf $(OUTPUT_DIR)/server.csr $(OUTPUT_DIR)/ca.crt $(OUTPUT_DIR)/ca.key
-	openssl x509 -req -in $(OUTPUT_DIR)/server.csr -CA $(OUTPUT_DIR)/ca.crt -CAkey $(OUTPUT_DIR)/ca.key -CAcreateserial -out $@ -sha256 -days 10 -extensions v3_req -extfile openssl.cnf
-
 # create a Kubernetes cluster
 .PHONY: cluster
-cluster: dex create-cluster
-	# add the Dex container IP to /etc/hosts of kube-apiserver
-	docker inspect -f '{{.NetworkSettings.IPAddress}}' dex-server | sed -e 's,$$, dex-server,' | \
-		kubectl -n kube-system exec -i kube-apiserver-$(CLUSTER_NAME)-control-plane -- tee -a /etc/hosts
-	# wait for kube-apiserver oidc initialization
-	# (oidc authenticator will retry oidc discovery every 10s)
-	sleep 10
-
-.PHONY: create-cluster
-create-cluster: $(OUTPUT_DIR)/ca.crt
-	cp $(OUTPUT_DIR)/ca.crt /tmp/kubelogin-acceptance-test-dex-ca.crt
-	kind create cluster --name $(CLUSTER_NAME) --config cluster.yaml
-	kubectl apply -f role.yaml
+cluster:
+	# create a cluster
+	mkdir -p $(OUTPUT_DIR)
+	sed -e "s|OIDC_ISSUER_URL|$(OIDC_ISSUER_URL)|" -e "s|OIDC_CLIENT_ID|$(OIDC_CLIENT_ID)|" cluster.yaml > $(OUTPUT_DIR)/cluster.yaml
+	kind create cluster --name $(CLUSTER_NAME) --config $(OUTPUT_DIR)/cluster.yaml
+	# set up access control
+	kubectl create clusterrole cluster-readonly --verb=get,watch,list --resource='*.*'
+	kubectl create clusterrolebinding cluster-readonly --clusterrole=cluster-readonly --user=$(YOUR_EMAIL)
+	# set up kubectl
+	kubectl config set-credentials oidc \
+		--exec-api-version=client.authentication.k8s.io/v1beta1 \
+		--exec-command=$(CURDIR)/../kubelogin \
+		--exec-arg=get-token \
+		--exec-arg=--token-cache-dir=$(OUTPUT_DIR)/token-cache \
+		--exec-arg=--oidc-issuer-url=$(OIDC_ISSUER_URL) \
+		--exec-arg=--oidc-client-id=$(OIDC_CLIENT_ID) \
+		--exec-arg=--oidc-client-secret=$(OIDC_CLIENT_SECRET) \
+		--exec-arg=--oidc-extra-scope=email
+	# switch the default user
+	kubectl config set-context --current --user=oidc
 
 # clean up the resources
 .PHONY: clean
@@ -102,7 +34,9 @@ clean:
 .PHONY: delete-cluster
 delete-cluster:
 	kind delete cluster --name $(CLUSTER_NAME)
-.PHONY: delete-dex
-delete-dex:
-	docker stop dex-server
-	docker rm dex-server
+
+.PHONY: check
+check:
+	docker version
+	kind version
+	kubectl version --client

acceptance_test/README.md

@@ -1,91 +1,75 @@
 # kubelogin/acceptance_test
 
-This is an acceptance test to verify behavior of kubelogin using a real Kubernetes cluster and OpenID Connect provider.
-It runs on [GitHub Actions](https://github.com/int128/kubelogin/actions?query=workflow%3Aacceptance-test).
-
-Let's take a look at the diagram.
-
-![diagram](../docs/acceptance-test-diagram.svg)
-
-It prepares the following resources:
-
-1. Generate a pair of CA certificate and TLS server certificate for Dex.
-1. Run Dex on a container.
-1. Create a Kubernetes cluster using Kind.
-1. Mutate `/etc/hosts` of the CI machine to access Dex.
-1. Mutate `/etc/hosts` of the kube-apiserver pod to access Dex.
-
-It performs the test by the following steps:
-
-1. Run kubectl.
-1. kubectl automatically runs kubelogin.
-1. kubelogin automatically runs [chromelogin](chromelogin).
-1. chromelogin opens the browser, navigates to `http://localhost:8000` and enter the username and password.
-1. kubelogin gets an authorization code from the browser.
-1. kubelogin gets a token.
-1. kubectl accesses an API with the token.
-1. kube-apiserver verifies the token by Dex.
-1. Check if kubectl exited with code 0.
+This is a manual test for verifying Kubernetes OIDC authentication with your OIDC provider.
 
 
-## Technical consideration
+## Purpose
 
-### Network and DNS
+This test checks the following points:
 
-Consider the following issues:
-
-- kube-apiserver runs on the host network of the kind container.
-- kube-apiserver cannot resolve a service name by kube-dns.
-- kube-apiserver cannot access a cluster IP.
-- kube-apiserver can access another container via the Docker network.
-- Chrome requires exactly match of domain name between Dex URL and a server certificate.
-
-Consequently,
-
-- kube-apiserver accesses Dex by resolving `/etc/hosts` and via the Docker network.
-- kubelogin and Chrome accesses Dex by resolving `/etc/hosts` and via the Docker network.
-
-### TLS server certificate
-
-Consider the following issues:
-
-- kube-apiserver requires `--oidc-issuer` is HTTPS URL.
-- kube-apiserver requires a CA certificate at startup, if `--oidc-ca-file` is given.
-- kube-apiserver mounts `/usr/local/share/ca-certificates` from the kind container.
-- It is possible to mount a file from the CI machine.
-- It is not possible to issue a certificate using Let's Encrypt in runtime.
-- Chrome requires a valid certificate in `~/.pki/nssdb`.
-
-As a result,
-
-- kube-apiserver uses the CA certificate of `/usr/local/share/ca-certificates/dex-ca.crt`. See the `extraMounts` section of [`cluster.yaml`](cluster.yaml).
-- kubelogin uses the CA certificate in `output/ca.crt`.
-- Chrome uses the CA certificate in `~/.pki/nssdb`.
-
-### Test environment
-
-- Set the issuer URL to kubectl. See [`kubeconfig_oidc.yaml`](kubeconfig_oidc.yaml).
-- Set the issuer URL to kube-apiserver. See [`cluster.yaml`](cluster.yaml).
-- Set `BROWSER` environment variable to run [`chromelogin`](chromelogin) by `xdg-open`.
+1. You can set up your OIDC provider using [setup guide](../docs/setup.md).
+1. The plugin works with your OIDC provider.
 
 
-## Run locally
+## Getting Started
 
-You need to set up Docker and Kind.
+### Prerequisite
 
-You need to add the following line to `/etc/hosts`:
+You need to build the plugin into the parent directory.
 
-```
-127.0.0.1 dex-server
+```sh
+make -C ..
 ```
 
-Run:
+You need to set up your provider.
+See [setup guide](../docs/setup.md) for more.
 
-```shell script
-# run the test
-make
+You need to install the following tools:
 
-# clean up
+- Docker
+- Kind
+- kubectl
+
+You can check if the tools are available.
+
+```sh
+make check
+```
+
+### 1. Create a cluster
+
+Create a cluster.
+For example, you can create a cluster with Google account authentication.
+
+```sh
+make OIDC_ISSUER_URL=https://accounts.google.com \
+  OIDC_CLIENT_ID=REDACTED.apps.googleusercontent.com \
+  OIDC_CLIENT_SECRET=REDACTED \
+  YOUR_EMAIL=REDACTED@gmail.com
+```
+
+It will do the following steps:
+
+1. Create a cluster.
+1. Set up access control. It allows read-only access from your email address.
+1. Set up kubectl to enable the plugin.
+
+You can change kubectl configuration in generated `output/kubeconfig.yaml`.
+
+### 2. Run kubectl
+
+Make sure you can log in to the provider and access the cluster.
+
+```console
+% export KUBECONFIG=$PWD/output/kubeconfig.yaml
+% kubectl get pods -A
+```
+
+### Clean up
+
+To delete the cluster and generated files:
+
+```sh
 make delete-cluster
-make delete-dex
+make clean
 ```

acceptance_test/cluster.yaml

@@ -1,6 +1,5 @@
 kind: Cluster
 apiVersion: kind.x-k8s.io/v1alpha4
-# https://github.com/dexidp/dex/blob/master/Documentation/kubernetes.md
 kubeadmConfigPatches:
   - |
     apiVersion: kubeadm.k8s.io/v1beta2
@@ -9,12 +8,6 @@ kubeadmConfigPatches:
       name: config
     apiServer:
       extraArgs:
-        oidc-issuer-url: https://dex-server:10443/dex
-        oidc-client-id: YOUR_CLIENT_ID
+        oidc-issuer-url: OIDC_ISSUER_URL
+        oidc-client-id: OIDC_CLIENT_ID
         oidc-username-claim: email
-        oidc-ca-file: /usr/local/share/ca-certificates/dex-ca.crt
-nodes:
-  - role: control-plane
-    extraMounts:
-      - hostPath: /tmp/kubelogin-acceptance-test-dex-ca.crt
-        containerPath: /usr/local/share/ca-certificates/dex-ca.crt

acceptance_test/role.yaml

@@ -1,21 +0,0 @@
-apiVersion: rbac.authorization.k8s.io/v1
-kind: ClusterRole
-metadata:
-  name: readonly-all-resources
-rules:
-  - apiGroups: ["*"]
-    resources: ["*"]
-    verbs: ["get", "watch", "list"]
----
-apiVersion: rbac.authorization.k8s.io/v1
-kind: ClusterRoleBinding
-metadata:
-  name: readonly-all-resources
-subjects:
-  - kind: User
-    name: admin@example.com
-    apiGroup: rbac.authorization.k8s.io
-roleRef:
-  kind: ClusterRole
-  name: readonly-all-resources
-  apiGroup: rbac.authorization.k8s.io

dist/Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.11
+FROM alpine:3.12
 
 ARG KUBELOGIN_VERSION="{{ env "VERSION" }}"
 ARG KUBELOGIN_SHA256="{{ sha256 .linux_amd64_archive }}"

dist/kubelogin.rb

@@ -1,15 +1,27 @@
 class Kubelogin < Formula
   desc "A kubectl plugin for Kubernetes OpenID Connect authentication"
   homepage "https://github.com/int128/kubelogin"
-  url "https://github.com/int128/kubelogin/releases/download/{{ env "VERSION" }}/kubelogin_darwin_amd64.zip"
+  baseurl = "https://github.com/int128/kubelogin/releases/download"
   version "{{ env "VERSION" }}"
-  sha256 "{{ sha256 .darwin_amd64_archive }}"
+  
+  if OS.mac?
+    kernel = "darwin"
+    sha256 "{{ sha256 .darwin_amd64_archive }}"
+  elsif OS.linux?
+    kernel = "linux"
+    sha256 "{{ sha256 .linux_amd64_archive }}"
+  end 
+   
+  url baseurl + "/#{version}/kubelogin_#{kernel}_amd64.zip"
+    
   def install
     bin.install "kubelogin" => "kubelogin"
     ln_s bin/"kubelogin", bin/"kubectl-oidc_login"
   end
+  
   test do
     system "#{bin}/kubelogin -h"
     system "#{bin}/kubectl-oidc_login -h"
   end
+    
 end

dist/oidc-login.yaml

@@ -22,8 +22,6 @@ spec:
 
   caveats: |
     You need to setup the OIDC provider, Kubernetes API server, role binding and kubeconfig.
-    See https://github.com/int128/kubelogin for more.
-
   version: {{ env "VERSION" }}
   platforms:
     - uri: https://github.com/int128/kubelogin/releases/download/{{ env "VERSION" }}/kubelogin_linux_amd64.zip
@@ -62,3 +60,27 @@ spec:
         matchLabels:
           os: windows
           arch: amd64
+    - uri: https://github.com/int128/kubelogin/releases/download/{{ env "VERSION" }}/kubelogin_linux_arm.zip
+      sha256: "{{ sha256 .linux_arm_archive }}"
+      bin: kubelogin
+      files:
+        - from: kubelogin
+          to: .
+        - from: LICENSE
+          to: .
+      selector:
+        matchLabels:
+          os: linux
+          arch: arm
+    - uri: https://github.com/int128/kubelogin/releases/download/{{ env "VERSION" }}/kubelogin_linux_arm64.zip
+      sha256: "{{ sha256 .linux_arm64_archive }}"
+      bin: kubelogin
+      files:
+        - from: kubelogin
+          to: .
+        - from: LICENSE
+          to: .
+      selector:
+        matchLabels:
+          os: linux
+          arch: arm64

docs/setup.md

@@ -126,6 +126,9 @@ Variable                | Value
 
 You do not need to set `YOUR_CLIENT_SECRET`.
 
+If you need `groups` claim for access control,
+see [jetstack/okta-kubectl-auth](https://github.com/jetstack/okta-kubectl-auth/blob/master/docs/okta-setup.md) and [#250](https://github.com/int128/kubelogin/issues/250).
+
 
 ## 2. Verify authentication
 
@@ -152,24 +155,9 @@ kubectl oidc-login setup --help
 ## 3. Bind a cluster role
 
 Here bind `cluster-admin` role to you.
-Apply the following manifest:
-
-```yaml
-kind: ClusterRoleBinding
-apiVersion: rbac.authorization.k8s.io/v1
-metadata:
-  name: oidc-cluster-admin
-roleRef:
-  apiGroup: rbac.authorization.k8s.io
-  kind: ClusterRole
-  name: cluster-admin
-subjects:
-- kind: User
-  name: ISSUER_URL#YOUR_SUBJECT
-```
 
 ```sh
-kubectl apply -f oidc-cluster-admin.yaml
+kubectl create clusterrolebinding oidc-cluster-admin --clusterrole=cluster-admin --user='ISSUER_URL#YOUR_SUBJECT'
 ```
 
 As well as you can create a custom cluster role and bind it.

docs/standalone-mode.md

@@ -75,57 +75,6 @@ If the refresh token has expired, kubelogin will proceed the authentication.
 
 ## Usage
 
-Kubelogin supports the following options:
-
-```
-% kubectl oidc-login -h
-Login to the OpenID Connect provider.
-
-You need to set up the OIDC provider, role binding, Kubernetes API server and kubeconfig.
-Run the following command to show the setup instruction:
-
-	kubectl oidc-login setup
-
-See https://github.com/int128/kubelogin for more.
-
-Usage:
-  main [flags]
-  main [command]
-
-Available Commands:
-  get-token   Run as a kubectl credential plugin
-  help        Help about any command
-  setup       Show the setup instruction
-  version     Print the version information
-
-Flags:
-      --kubeconfig string                Path to the kubeconfig file
-      --context string                   The name of the kubeconfig context to use
-      --user string                      The name of the kubeconfig user to use. Prior to --context
-      --certificate-authority string     Path to a cert file for the certificate authority
-      --insecure-skip-tls-verify         If true, the server's certificate will not be checked for validity. This will make your HTTPS connections insecure
-      --grant-type string                The authorization grant type to use. One of (auto|authcode|authcode-keyboard|password) (default "auto")
-      --listen-address strings           Address to bind to the local server. If multiple addresses are given, it will try binding in order (default [127.0.0.1:8000,127.0.0.1:18000])
-      --listen-port ints                 (Deprecated: use --listen-address)
-      --skip-open-browser                If true, it does not open the browser on authentication
-      --username string                  If set, perform the resource owner password credentials grant
-      --password string                  If set, use the password instead of asking it
-      --add_dir_header                   If true, adds the file directory to the header
-      --alsologtostderr                  log to standard error as well as files
-      --log_backtrace_at traceLocation   when logging hits line file:N, emit a stack trace (default :0)
-      --log_dir string                   If non-empty, write log files in this directory
-      --log_file string                  If non-empty, use this log file
-      --log_file_max_size uint           Defines the maximum size a log file can grow to. Unit is megabytes. If the value is 0, the maximum file size is unlimited. (default 1800)
-      --logtostderr                      log to standard error instead of files (default true)
-      --skip_headers                     If true, avoid header prefixes in the log messages
-      --skip_log_headers                 If true, avoid headers when opening log files
-      --stderrthreshold severity         logs at or above this threshold go to stderr (default 2)
-  -v, --v Level                          number for the log level verbosity
-      --vmodule moduleSpec               comma-separated list of pattern=N settings for file-filtered logging
-  -h, --help                             help for main
-      --version                          version for main
-```
-
 ### Kubeconfig
 
 You can set path to the kubeconfig file by the option or the environment variable just like kubectl.

docs/usage.md

@@ -0,0 +1,237 @@
+# Usage
+
+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
+      --authentication-timeout-sec int                  [authcode] Timeout of authentication in seconds (default 180)
+      --local-server-cert string                        [authcode] Certificate path for the local server
+      --local-server-key string                         [authcode] Certificate key path for the local server
+      --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
+```
+
+
+## Options
+
+### Authentication timeout
+
+By default, you need to log in to your provider in the browser within 3 minutes.
+This prevents a process from remaining forever.
+You can change the timeout by the following flag:
+
+```yaml
+      - --authentication-timeout-sec=60
+```
+
+For now this timeout works only for the authorization code flow.
+
+### Extra scopes
+
+You can set the extra scopes to request to the provider by `--oidc-extra-scope`.
+
+```yaml
+      - --oidc-extra-scope=email
+      - --oidc-extra-scope=profile
+```
+
+### CA certificate
+
+You can use your self-signed certificate for the provider.
+
+```yaml
+      - --certificate-authority=/home/user/.kube/keycloak-ca.pem
+      - --certificate-authority-data=LS0t...
+```
+
+### 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
+
+Kubelogin support the following flows:
+
+- Authorization code flow
+- Authorization code flow with a keyboard
+- Resource owner password credentials grant flow
+
+### 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 specify a certificate for the local webserver if HTTPS is required by your identity provider.
+
+```yaml
+      - --local-server-cert=localhost.crt
+      - --local-server-key=localhost.key
+```
+
+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
+```
+
+You can skip opening the browser if you encounter some environment problem.
+
+```yaml
+      - --skip-open-browser
+```
+
+For Linux users, you change the default browser by `BROWSER` environment variable.
+
+### Authorization code flow with a keyboard
+
+If you cannot access the browser, instead use the authorization code flow with a keyboard.
+
+```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:
+```
+
+## Run in 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.

go.mod

@@ -6,21 +6,22 @@ require (
 	github.com/chromedp/chromedp v0.5.3
 	github.com/coreos/go-oidc v2.2.1+incompatible
 	github.com/dgrijalva/jwt-go v3.2.0+incompatible
-	github.com/golang/mock v1.4.0
-	github.com/google/go-cmp v0.4.0
+	github.com/golang/mock v1.4.4
+	github.com/google/go-cmp v0.5.2
 	github.com/google/wire v0.4.0
-	github.com/int128/oauth2cli v1.9.0
+	github.com/int128/oauth2cli v1.13.0
 	github.com/pkg/browser v0.0.0-20180916011732-0a3d74bf9ce4
 	github.com/pquerna/cachecontrol v0.0.0-20180517163645-1555304b9b35 // indirect
-	github.com/spf13/cobra v0.0.6
+	github.com/spf13/cobra v1.0.0
 	github.com/spf13/pflag v1.0.5
-	golang.org/x/crypto v0.0.0-20190820162420-60c769a6c586
-	golang.org/x/oauth2 v0.0.0-20200107190931-bf48bf16ab8d
-	golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e
-	golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543
+	golang.org/x/crypto v0.0.0-20200820211705-5c72a883971a
+	golang.org/x/oauth2 v0.0.0-20200902213428-5d25da1a8d43
+	golang.org/x/sync v0.0.0-20200625203802-6e8e738ad208
+	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1
+	google.golang.org/protobuf v1.25.0 // indirect
 	gopkg.in/square/go-jose.v2 v2.3.1 // indirect
-	gopkg.in/yaml.v2 v2.2.8
-	k8s.io/apimachinery v0.17.3
-	k8s.io/client-go v0.17.3
+	gopkg.in/yaml.v2 v2.3.0
+	k8s.io/apimachinery v0.19.2
+	k8s.io/client-go v0.19.2
 	k8s.io/klog v1.0.0
 )

go.sum

@@ -1,14 +1,50 @@
 cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
 cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
 cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
+cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
+cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
+cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
+cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
+cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To=
+cloud.google.com/go v0.51.0/go.mod h1:hWtGJ6gnXH+KgDv+V0zFGDvpi07n3z8ZNj3T1RW0Gcw=
+cloud.google.com/go v0.52.0/go.mod h1:pXajvRH/6o3+F9jDHZWQ5PbGhn+o8w9qiu/CffaVdO4=
+cloud.google.com/go v0.53.0/go.mod h1:fp/UouUEsRkN6ryDKNW/Upv/JBKnv6WDthjR6+vze6M=
+cloud.google.com/go v0.54.0/go.mod h1:1rq2OEkV3YMf6n/9ZvGWI3GWw0VoqH/1x2nd8Is/bPc=
+cloud.google.com/go v0.56.0/go.mod h1:jr7tqZxxKOVYizybht9+26Z/gUq7tiRzu+ACVAMbKVk=
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+cloud.google.com/go v0.62.0/go.mod h1:jmCYTdRCQuc1PHIIJ/maLInMho30T/Y0M4hTdTShOYc=
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+cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o=
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 github.com/Azure/go-autorest/tracing v0.5.0/go.mod h1:r/s2XiOKccPW3HrqB+W0TQzfbtp2fGCgRFtBroKn4Dk=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
 github.com/NYTimes/gziphandler v0.0.0-20170623195520-56545f4a5d46/go.mod h1:3wb06e3pkSAbeQ52E9H9iFoQsEEwGN64994WTCIhntQ=
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@@ -18,12 +54,17 @@ github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRF
 github.com/armon/consul-api v0.0.0-20180202201655-eb2c6b5be1b6/go.mod h1:grANhF5doyWs3UAsr3K4I6qtAmlQcZDesFNEHPZAzj8=
 github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
 github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
+github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
 github.com/cespare/xxhash v1.1.0/go.mod h1:XrSqR1VqqWfGrhpAt58auRo0WTKS1nRRg3ghfAqPWnc=
 github.com/chromedp/cdproto v0.0.0-20200116234248-4da64dd111ac h1:T7V5BXqnYd55Hj/g5uhDYumg9Fp3rMTS6bykYtTIFX4=
 github.com/chromedp/cdproto v0.0.0-20200116234248-4da64dd111ac/go.mod h1:PfAWWKJqjlGFYJEidUM6aVIWPr0EpobeyVWEEmplX7g=
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+github.com/chzyer/logex v1.1.10/go.mod h1:+Ywpsq7O8HXn0nuIou7OrIPyXbp3wmkHB+jjWRnGsAI=
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+github.com/cncf/udpa/go v0.0.0-20191209042840-269d4d468f6f/go.mod h1:M8M6+tZqaGXZJjfX53e64911xZQV5JYwmTeXPW+k8Sc=
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@@ -32,7 +73,6 @@ github.com/coreos/go-semver v0.2.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3Ee
 github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
 github.com/coreos/pkg v0.0.0-20180928190104-399ea9e2e55f/go.mod h1:E3G3o1h8I7cfcXa63jLwjI0eiQQMgzzUDFVpN/nH/eA=
 github.com/cpuguy83/go-md2man/v2 v2.0.0/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
-github.com/davecgh/go-spew v0.0.0-20151105211317-5215b55f46b2/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
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@@ -40,16 +80,27 @@ github.com/dgrijalva/jwt-go v3.2.0+incompatible h1:7qlOGliEKZXTDg6OTjfoBKDXWrumC
 github.com/dgrijalva/jwt-go v3.2.0+incompatible/go.mod h1:E3ru+11k8xSBh+hMPgOLZmtrrCbhqsmaPHjLKYnJCaQ=
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+github.com/go-logr/logr v0.2.0 h1:QvGt2nLcHH0WK9orKa+ppBPAxREcH364nPUedEpK0TY=
+github.com/go-logr/logr v0.2.0/go.mod h1:z6/tIYblkpsD+a4lm/fGIIU9mZ+XfAiaFtq7xTgseGU=
 github.com/go-openapi/jsonpointer v0.0.0-20160704185906-46af16f9f7b1/go.mod h1:+35s3my2LFTysnkMfxsJBAMHj/DoqoB9knIWoYG/Vk0=
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@@ -63,40 +114,70 @@ github.com/gobwas/ws v1.0.2 h1:CoAavW/wd/kulfZmSIBt6p24n4j7tHgNVCjsfHVNUbo=
 github.com/gobwas/ws v1.0.2/go.mod h1:szmBTxLgaFppYjEmNtny/v3w89xOydFnnZMcgRRu/EM=
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@@ -106,19 +187,21 @@ github.com/hashicorp/golang-lru v0.5.0/go.mod h1:/m3WP610KZHVQ1SGc6re/UDhFvYD7pJ
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@@ -129,6 +212,8 @@ github.com/konsorten/go-windows-terminal-sequences v1.0.1/go.mod h1:T0+1ngSBFLxv
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@@ -142,7 +227,6 @@ github.com/mitchellh/mapstructure v1.1.2/go.mod h1:FVVH3fgwuzCH5S8UJGiWEs2h04kUh
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@@ -152,7 +236,7 @@ github.com/mxk/go-flowrate v0.0.0-20140419014527-cca7078d478f/go.mod h1:ZdcZmHo+
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@@ -160,7 +244,7 @@ github.com/peterbourgon/diskv v2.0.1+incompatible/go.mod h1:uqqh8zWWbv1HBMNONnaR
 github.com/pkg/browser v0.0.0-20180916011732-0a3d74bf9ce4 h1:49lOXmGaUpV9Fz3gd7TFZY106KVlPVa5jcYD1gaQf98=
 github.com/pkg/browser v0.0.0-20180916011732-0a3d74bf9ce4/go.mod h1:4OwLy04Bl9Ef3GJJCoec+30X3LQs/0/m4HFRt/2LUSA=
 github.com/pkg/errors v0.8.0/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
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@@ -169,12 +253,14 @@ github.com/prometheus/client_golang v0.9.1/go.mod h1:7SWBe2y4D6OKWSNQJUaRYU/AaXP
 github.com/prometheus/client_golang v0.9.3/go.mod h1:/TN21ttK/J9q6uSwhBd54HahCDft0ttaMvbicHlPoso=
 github.com/prometheus/client_model v0.0.0-20180712105110-5c3871d89910/go.mod h1:MbSGuTsp3dbXC40dX6PRTWyKYBIrTGTE9sqQNg2J8bo=
 github.com/prometheus/client_model v0.0.0-20190129233127-fd36f4220a90/go.mod h1:xMI15A0UPsDsEKsMN9yxemIoYk6Tm2C1GtYGdfGttqA=
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@@ -183,8 +269,8 @@ github.com/spaolacci/murmur3 v0.0.0-20180118202830-f09979ecbc72/go.mod h1:JwIasO
 github.com/spf13/afero v1.1.2/go.mod h1:j4pytiNVoe2o6bmDsKpLACNPDBIoEAkihy7loJ1B0CQ=
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-github.com/spf13/cobra v0.0.6 h1:breEStsVwemnKh2/s6gMvSdMEkwW0sK8vGStnlVBMCs=
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 github.com/spf13/pflag v1.0.3 h1:zPAT6CGy6wXeQ7NtTnaTerfKOsV6V6F8agHXFiazDkg=
@@ -194,7 +280,6 @@ github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An
 github.com/spf13/viper v1.4.0/go.mod h1:PTJ7Z/lr49W6bUbkmS1V3by4uWynFiR9p7+dSq/yZzE=
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 github.com/stretchr/objx v0.1.1/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
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@@ -204,23 +289,59 @@ github.com/tmc/grpc-websocket-proxy v0.0.0-20190109142713-0ad062ec5ee5/go.mod h1
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 go.etcd.io/bbolt v1.3.2/go.mod h1:IbVyRI1SCnLcuJnV2u8VeU0CEYM7e686BmAb1XKL+uU=
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@@ -231,15 +352,38 @@ golang.org/x/net v0.0.0-20190213061140-3a22650c66bd/go.mod h1:mL1N/T3taQHkDXs73r
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-k8s.io/klog v0.3.0/go.mod h1:Gq+BEi5rUBO/HRz0bTSXDUcqjScdoY3a9IHpCEIOOfk=
+honnef.co/go/tools v0.0.0-20190418001031-e561f6794a2a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
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+honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
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 k8s.io/klog v1.0.0 h1:Pt+yjF5aB1xDSVbau4VsWe+dQNzA0qv1LlXdC2dF6Q8=
 k8s.io/klog v1.0.0/go.mod h1:4Bi6QPql/J/LkTDqv7R/cd3hPo4k2DG6Ptcz060Ez5I=
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-k8s.io/utils v0.0.0-20191114184206-e782cd3c129f/go.mod h1:sZAwmy6armz5eXlNoLmJcl4F1QuKu7sr+mFQ0byX7Ew=
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+rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
 rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
-rsc.io/sampler v1.3.0 h1:7uVkIFmeBqHfdjD+gZwtXXI+RODJ2Wc4O7MPEh/QiW4=
 rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=
-sigs.k8s.io/structured-merge-diff v0.0.0-20190525122527-15d366b2352e/go.mod h1:wWxsB5ozmmv/SG7nM11ayaAW51xMvak/t1r0CSlcokI=
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+sigs.k8s.io/structured-merge-diff/v4 v4.0.1/go.mod h1:bJZC9H9iH24zzfZ/41RGcq60oK1F7G282QMXDPYydCw=
 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=

integration_test/credetial_plugin_test.go

@@ -1,26 +1,24 @@
 package integration_test
 
 import (
+	"bytes"
 	"context"
-	"io/ioutil"
+	"encoding/json"
+	"io"
 	"os"
 	"testing"
 	"time"
 
-	"github.com/golang/mock/gomock"
 	"github.com/google/go-cmp/cmp"
-	"github.com/int128/kubelogin/integration_test/idp"
-	"github.com/int128/kubelogin/integration_test/idp/mock_idp"
-	"github.com/int128/kubelogin/integration_test/keys"
-	"github.com/int128/kubelogin/integration_test/localserver"
+	"github.com/int128/kubelogin/integration_test/httpdriver"
+	"github.com/int128/kubelogin/integration_test/keypair"
+	"github.com/int128/kubelogin/integration_test/oidcserver"
 	"github.com/int128/kubelogin/pkg/adaptors/browser"
-	"github.com/int128/kubelogin/pkg/adaptors/browser/mock_browser"
-	"github.com/int128/kubelogin/pkg/adaptors/credentialpluginwriter"
-	"github.com/int128/kubelogin/pkg/adaptors/credentialpluginwriter/mock_credentialpluginwriter"
-	"github.com/int128/kubelogin/pkg/adaptors/tokencache"
 	"github.com/int128/kubelogin/pkg/di"
-	"github.com/int128/kubelogin/pkg/testing/jwt"
+	"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.
@@ -31,289 +29,415 @@ import (
 // 4. Verify the output.
 //
 func TestCredentialPlugin(t *testing.T) {
-	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)
-		}
-	}()
+	timeout := 3 * time.Second
+	now := time.Date(2020, 1, 1, 0, 0, 0, 0, time.UTC)
+	tokenCacheDir := t.TempDir()
 
-	t.Run("NoTLS", func(t *testing.T) {
-		testCredentialPlugin(t, credentialPluginTestCase{
-			TokenCacheDir: tokenCacheDir,
-			Keys:          keys.None,
-			ExtraArgs: []string{
-				"--token-cache-dir", tokenCacheDir,
+	for name, tc := range map[string]struct {
+		keyPair keypair.KeyPair
+		args    []string
+	}{
+		"NoTLS": {},
+		"TLS": {
+			keyPair: keypair.Server,
+			args:    []string{"--certificate-authority", keypair.Server.CACertPath},
+		},
+	} {
+		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"},
 			},
 		})
-	})
-	t.Run("TLS", func(t *testing.T) {
-		t.Run("CertFile", func(t *testing.T) {
-			testCredentialPlugin(t, credentialPluginTestCase{
-				TokenCacheDir: tokenCacheDir,
-				TokenCacheKey: tokencache.Key{CACertFilename: keys.Server.CACertPath},
-				Keys:          keys.Server,
-				ExtraArgs: []string{
-					"--token-cache-dir", tokenCacheDir,
-					"--certificate-authority", keys.Server.CACertPath,
-				},
-			})
-		})
-		t.Run("CertData", func(t *testing.T) {
-			testCredentialPlugin(t, credentialPluginTestCase{
-				TokenCacheDir: tokenCacheDir,
-				TokenCacheKey: tokencache.Key{CACertData: keys.Server.CACertBase64},
-				Keys:          keys.Server,
-				ExtraArgs: []string{
-					"--token-cache-dir", tokenCacheDir,
-					"--certificate-authority-data", keys.Server.CACertBase64,
-				},
-			})
+		defer sv.Shutdown(t, ctx)
+		var stdout bytes.Buffer
+		runGetToken(t, ctx, getTokenConfig{
+			tokenCacheDir: tokenCacheDir,
+			issuerURL:     sv.IssuerURL(),
+			httpDriver:    httpdriver.New(ctx, t, httpdriver.Option{BodyContains: "Authenticated"}),
+			now:           now,
+			stdout:        &stdout,
 		})
+		assertCredentialPluginStdout(t, &stdout, sv.LastTokenResponse().IDToken, now.Add(time.Hour))
 	})
-}
 
-type credentialPluginTestCase struct {
-	TokenCacheDir string
-	TokenCacheKey tokencache.Key
-	Keys          keys.Keys
-	ExtraArgs     []string
-}
-
-func testCredentialPlugin(t *testing.T, tc credentialPluginTestCase) {
-	timeout := 1 * time.Second
-
-	t.Run("Defaults", func(t *testing.T) {
+	t.Run("TLSData", func(t *testing.T) {
 		t.Parallel()
 		ctx, cancel := context.WithTimeout(context.TODO(), timeout)
 		defer cancel()
-		ctrl := gomock.NewController(t)
-		defer ctrl.Finish()
-
-		provider := mock_idp.NewMockProvider(ctrl)
-		serverURL, server := localserver.Start(t, idp.NewHandler(t, provider), tc.Keys)
-		defer server.Shutdown(t, ctx)
-		var idToken string
-		setupAuthCodeFlow(t, provider, serverURL, "openid", &idToken)
-		writerMock := newCredentialPluginWriterMock(t, ctrl, &idToken)
-		browserMock := newBrowserMock(ctx, t, ctrl, tc.Keys)
-
-		args := []string{
-			"--oidc-issuer-url", serverURL,
-			"--oidc-client-id", "kubernetes",
-		}
-		args = append(args, tc.ExtraArgs...)
-		runGetTokenCmd(t, ctx, browserMock, writerMock, args)
-	})
-
-	t.Run("ResourceOwnerPasswordCredentials", func(t *testing.T) {
-		t.Parallel()
-		ctx, cancel := context.WithTimeout(context.TODO(), timeout)
-		defer cancel()
-		ctrl := gomock.NewController(t)
-		defer ctrl.Finish()
-
-		provider := mock_idp.NewMockProvider(ctrl)
-		serverURL, server := localserver.Start(t, idp.NewHandler(t, provider), tc.Keys)
-		defer server.Shutdown(t, ctx)
-		idToken := newIDToken(t, serverURL, "", tokenExpiryFuture)
-		setupROPCFlow(provider, serverURL, "openid", "USER", "PASS", idToken)
-		writerMock := newCredentialPluginWriterMock(t, ctrl, &idToken)
-		browserMock := mock_browser.NewMockInterface(ctrl)
-
-		args := []string{
-			"--oidc-issuer-url", serverURL,
-			"--oidc-client-id", "kubernetes",
-			"--username", "USER",
-			"--password", "PASS",
-		}
-		args = append(args, tc.ExtraArgs...)
-		runGetTokenCmd(t, ctx, browserMock, writerMock, args)
-	})
-
-	t.Run("HasValidToken", func(t *testing.T) {
-		t.Parallel()
-		ctx, cancel := context.WithTimeout(context.TODO(), timeout)
-		defer cancel()
-		ctrl := gomock.NewController(t)
-		defer ctrl.Finish()
-
-		provider := mock_idp.NewMockProvider(ctrl)
-		serverURL, server := localserver.Start(t, idp.NewHandler(t, provider), tc.Keys)
-		defer server.Shutdown(t, ctx)
-		idToken := newIDToken(t, serverURL, "YOUR_NONCE", tokenExpiryFuture)
-		writerMock := newCredentialPluginWriterMock(t, ctrl, &idToken)
-		browserMock := mock_browser.NewMockInterface(ctrl)
-		setupTokenCache(t, tc, serverURL, tokencache.Value{
-			IDToken:      idToken,
-			RefreshToken: "YOUR_REFRESH_TOKEN",
+		sv := oidcserver.New(t, keypair.Server, oidcserver.Config{
+			Want: oidcserver.Want{
+				Scope:             "openid",
+				RedirectURIPrefix: "http://localhost:",
+			},
+			Response: oidcserver.Response{
+				IDTokenExpiry: now.Add(time.Hour),
+			},
 		})
-
-		args := []string{
-			"--oidc-issuer-url", serverURL,
-			"--oidc-client-id", "kubernetes",
-		}
-		args = append(args, tc.ExtraArgs...)
-		runGetTokenCmd(t, ctx, browserMock, writerMock, args)
-		assertTokenCache(t, tc, serverURL, tokencache.Value{
-			IDToken:      idToken,
-			RefreshToken: "YOUR_REFRESH_TOKEN",
-		})
-	})
-
-	t.Run("HasValidRefreshToken", func(t *testing.T) {
-		t.Parallel()
-		ctx, cancel := context.WithTimeout(context.TODO(), timeout)
-		defer cancel()
-		ctrl := gomock.NewController(t)
-		defer ctrl.Finish()
-
-		provider := mock_idp.NewMockProvider(ctrl)
-		serverURL, server := localserver.Start(t, idp.NewHandler(t, provider), tc.Keys)
-		defer server.Shutdown(t, ctx)
-		validIDToken := newIDToken(t, serverURL, "YOUR_NONCE", tokenExpiryFuture)
-		expiredIDToken := newIDToken(t, serverURL, "YOUR_NONCE", tokenExpiryPast)
-
-		provider.EXPECT().Discovery().Return(idp.NewDiscoveryResponse(serverURL))
-		provider.EXPECT().GetCertificates().Return(idp.NewCertificatesResponse(jwt.PrivateKey))
-		provider.EXPECT().Refresh("VALID_REFRESH_TOKEN").
-			Return(idp.NewTokenResponse(validIDToken, "NEW_REFRESH_TOKEN"), nil)
-
-		setupTokenCache(t, tc, serverURL, tokencache.Value{
-			IDToken:      expiredIDToken,
-			RefreshToken: "VALID_REFRESH_TOKEN",
-		})
-		writerMock := newCredentialPluginWriterMock(t, ctrl, &validIDToken)
-		browserMock := mock_browser.NewMockInterface(ctrl)
-
-		args := []string{
-			"--oidc-issuer-url", serverURL,
-			"--oidc-client-id", "kubernetes",
-		}
-		args = append(args, tc.ExtraArgs...)
-		runGetTokenCmd(t, ctx, browserMock, writerMock, args)
-		assertTokenCache(t, tc, serverURL, tokencache.Value{
-			IDToken:      validIDToken,
-			RefreshToken: "NEW_REFRESH_TOKEN",
-		})
-	})
-
-	t.Run("HasExpiredRefreshToken", func(t *testing.T) {
-		t.Parallel()
-		ctx, cancel := context.WithTimeout(context.TODO(), timeout)
-		defer cancel()
-		ctrl := gomock.NewController(t)
-		defer ctrl.Finish()
-
-		provider := mock_idp.NewMockProvider(ctrl)
-		serverURL, server := localserver.Start(t, idp.NewHandler(t, provider), tc.Keys)
-		defer server.Shutdown(t, ctx)
-		validIDToken := newIDToken(t, serverURL, "YOUR_NONCE", tokenExpiryFuture)
-		expiredIDToken := newIDToken(t, serverURL, "YOUR_NONCE", tokenExpiryPast)
-
-		setupAuthCodeFlow(t, provider, serverURL, "openid", &validIDToken)
-		provider.EXPECT().Refresh("EXPIRED_REFRESH_TOKEN").
-			Return(nil, &idp.ErrorResponse{Code: "invalid_request", Description: "token has expired"}).
-			MaxTimes(2) // package oauth2 will retry refreshing the token
-
-		setupTokenCache(t, tc, serverURL, tokencache.Value{
-			IDToken:      expiredIDToken,
-			RefreshToken: "EXPIRED_REFRESH_TOKEN",
-		})
-		writerMock := newCredentialPluginWriterMock(t, ctrl, &validIDToken)
-		browserMock := newBrowserMock(ctx, t, ctrl, tc.Keys)
-
-		args := []string{
-			"--oidc-issuer-url", serverURL,
-			"--oidc-client-id", "kubernetes",
-		}
-		args = append(args, tc.ExtraArgs...)
-		runGetTokenCmd(t, ctx, browserMock, writerMock, args)
-		assertTokenCache(t, tc, serverURL, tokencache.Value{
-			IDToken:      validIDToken,
-			RefreshToken: "YOUR_REFRESH_TOKEN",
+		defer sv.Shutdown(t, ctx)
+		var stdout bytes.Buffer
+		runGetToken(t, ctx, getTokenConfig{
+			tokenCacheDir: tokenCacheDir,
+			issuerURL:     sv.IssuerURL(),
+			httpDriver:    httpdriver.New(ctx, t, 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()
-		ctrl := gomock.NewController(t)
-		defer ctrl.Finish()
+		sv := oidcserver.New(t, keypair.None, oidcserver.Config{
+			Want: oidcserver.Want{
+				Scope:             "email profile openid",
+				RedirectURIPrefix: "http://localhost:",
+			},
+			Response: oidcserver.Response{
+				IDTokenExpiry: now.Add(time.Hour),
+			},
+		})
+		defer sv.Shutdown(t, ctx)
+		var stdout bytes.Buffer
+		runGetToken(t, ctx, getTokenConfig{
+			tokenCacheDir: tokenCacheDir,
+			issuerURL:     sv.IssuerURL(),
+			httpDriver:    httpdriver.New(ctx, t, 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))
+	})
 
-		provider := mock_idp.NewMockProvider(ctrl)
-		serverURL, server := localserver.Start(t, idp.NewHandler(t, provider), tc.Keys)
-		defer server.Shutdown(t, ctx)
-		var idToken string
-		setupAuthCodeFlow(t, provider, serverURL, "email profile openid", &idToken)
-		writerMock := newCredentialPluginWriterMock(t, ctrl, &idToken)
-		browserMock := newBrowserMock(ctx, t, ctrl, tc.Keys)
+	t.Run("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))
+	})
 
-		args := []string{
-			"--oidc-issuer-url", serverURL,
-			"--oidc-client-id", "kubernetes",
-			"--oidc-extra-scope", "email",
-			"--oidc-extra-scope", "profile",
-		}
-		args = append(args, tc.ExtraArgs...)
-		runGetTokenCmd(t, ctx, browserMock, writerMock, args)
+	t.Run("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("RedirectURLHTTPS", 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: "https://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{
+				"--local-server-cert", keypair.Server.CertPath,
+				"--local-server-key", keypair.Server.KeyPath,
+			},
+		})
+		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))
 	})
 }
 
-func newCredentialPluginWriterMock(t *testing.T, ctrl *gomock.Controller, idToken *string) *mock_credentialpluginwriter.MockInterface {
-	writer := mock_credentialpluginwriter.NewMockInterface(ctrl)
-	writer.EXPECT().
-		Write(gomock.Any()).
-		Do(func(got credentialpluginwriter.Output) {
-			want := credentialpluginwriter.Output{
-				Token:  *idToken,
-				Expiry: tokenExpiryFuture,
-			}
-			if diff := cmp.Diff(want, got); diff != "" {
-				t.Errorf("mismatch (-want +got):\n%s", diff)
-			}
-		})
-	return writer
+type getTokenConfig struct {
+	tokenCacheDir string
+	issuerURL     string
+	httpDriver    browser.Interface
+	stdout        io.Writer
+	now           time.Time
+	args          []string
 }
 
-func runGetTokenCmd(t *testing.T, ctx context.Context, b browser.Interface, w credentialpluginwriter.Interface, args []string) {
-	t.Helper()
-	cmd := di.NewCmdForHeadless(logger.New(t), b, w)
+func runGetToken(t *testing.T, ctx context.Context, cfg getTokenConfig) {
+	cmd := di.NewCmdForHeadless(clock.Fake(cfg.now), os.Stdin, cfg.stdout, logger.New(t), cfg.httpDriver)
 	exitCode := cmd.Run(ctx, append([]string{
-		"kubelogin", "get-token",
-		"--v=1",
+		"kubelogin",
+		"get-token",
+		"--token-cache-dir", cfg.tokenCacheDir,
+		"--oidc-issuer-url", cfg.issuerURL,
+		"--oidc-client-id", "kubernetes",
 		"--listen-address", "127.0.0.1:0",
-	}, args...), "HEAD")
+	}, cfg.args...), "latest")
 	if exitCode != 0 {
 		t.Errorf("exit status wants 0 but %d", exitCode)
 	}
 }
 
-func setupTokenCache(t *testing.T, tc credentialPluginTestCase, serverURL string, v tokencache.Value) {
-	k := tc.TokenCacheKey
-	k.IssuerURL = serverURL
-	k.ClientID = "kubernetes"
-	var r tokencache.Repository
-	err := r.Save(tc.TokenCacheDir, k, v)
-	if err != nil {
-		t.Errorf("could not set up the token cache: %s", err)
-	}
-}
-
-func assertTokenCache(t *testing.T, tc credentialPluginTestCase, serverURL string, want tokencache.Value) {
-	k := tc.TokenCacheKey
-	k.IssuerURL = serverURL
-	k.ClientID = "kubernetes"
-	var r tokencache.Repository
-	got, err := r.FindByKey(tc.TokenCacheDir, k)
-	if err != nil {
-		t.Errorf("could not set up the token cache: %s", err)
-	}
-	if diff := cmp.Diff(&want, got); diff != "" {
-		t.Errorf("mismatch (-want +got):\n%s", diff)
+func assertCredentialPluginStdout(t *testing.T, stdout io.Reader, token string, expiry time.Time) {
+	var got clientauthenticationv1beta1.ExecCredential
+	if err := json.NewDecoder(stdout).Decode(&got); err != nil {
+		t.Errorf("could not decode json of the credential plugin: %s", err)
+		return
+	}
+	want := clientauthenticationv1beta1.ExecCredential{
+		TypeMeta: metav1.TypeMeta{
+			APIVersion: "client.authentication.k8s.io/v1beta1",
+			Kind:       "ExecCredential",
+		},
+		Status: &clientauthenticationv1beta1.ExecCredentialStatus{
+			Token:               token,
+			ExpirationTimestamp: &metav1.Time{Time: expiry},
+		},
+	}
+	if diff := cmp.Diff(want, got); diff != "" {
+		t.Errorf("kubeconfig mismatch (-want +got):\n%s", diff)
 	}
 }

integration_test/helpers_test.go

@@ -1,82 +0,0 @@
-package integration_test
-
-import (
-	"context"
-	"net/http"
-	"testing"
-	"time"
-
-	"github.com/golang/mock/gomock"
-	"github.com/int128/kubelogin/integration_test/idp"
-	"github.com/int128/kubelogin/integration_test/idp/mock_idp"
-	"github.com/int128/kubelogin/integration_test/keys"
-	"github.com/int128/kubelogin/pkg/adaptors/browser"
-	"github.com/int128/kubelogin/pkg/adaptors/browser/mock_browser"
-	"github.com/int128/kubelogin/pkg/testing/jwt"
-)
-
-var (
-	tokenExpiryFuture = time.Now().Add(time.Hour).Round(time.Second)
-	tokenExpiryPast   = time.Now().Add(-time.Hour).Round(time.Second)
-)
-
-func newIDToken(t *testing.T, issuer, nonce string, expiry time.Time) string {
-	t.Helper()
-	return jwt.EncodeF(t, func(claims *jwt.Claims) {
-		claims.Issuer = issuer
-		claims.Subject = "SUBJECT"
-		claims.IssuedAt = time.Now().Unix()
-		claims.ExpiresAt = expiry.Unix()
-		claims.Audience = []string{"kubernetes", "system"}
-		claims.Nonce = nonce
-		claims.Groups = []string{"admin", "users"}
-	})
-}
-
-func setupAuthCodeFlow(t *testing.T, provider *mock_idp.MockProvider, serverURL, scope string, idToken *string) {
-	var nonce string
-	provider.EXPECT().Discovery().Return(idp.NewDiscoveryResponse(serverURL))
-	provider.EXPECT().GetCertificates().Return(idp.NewCertificatesResponse(jwt.PrivateKey))
-	provider.EXPECT().AuthenticateCode(scope, gomock.Any()).
-		DoAndReturn(func(_, gotNonce string) (string, error) {
-			nonce = gotNonce
-			return "YOUR_AUTH_CODE", nil
-		})
-	provider.EXPECT().Exchange("YOUR_AUTH_CODE").
-		DoAndReturn(func(string) (*idp.TokenResponse, error) {
-			*idToken = newIDToken(t, serverURL, nonce, tokenExpiryFuture)
-			return idp.NewTokenResponse(*idToken, "YOUR_REFRESH_TOKEN"), nil
-		})
-}
-
-func setupROPCFlow(provider *mock_idp.MockProvider, serverURL, scope, username, password, idToken string) {
-	provider.EXPECT().Discovery().Return(idp.NewDiscoveryResponse(serverURL))
-	provider.EXPECT().GetCertificates().Return(idp.NewCertificatesResponse(jwt.PrivateKey))
-	provider.EXPECT().AuthenticatePassword(username, password, scope).
-		Return(idp.NewTokenResponse(idToken, "YOUR_REFRESH_TOKEN"), nil)
-}
-
-func newBrowserMock(ctx context.Context, t *testing.T, ctrl *gomock.Controller, k keys.Keys) browser.Interface {
-	b := mock_browser.NewMockInterface(ctrl)
-	b.EXPECT().
-		Open(gomock.Any()).
-		Do(func(url string) {
-			client := http.Client{Transport: &http.Transport{TLSClientConfig: k.TLSConfig}}
-			req, err := http.NewRequest("GET", url, nil)
-			if err != nil {
-				t.Errorf("could not create a request: %s", err)
-				return
-			}
-			req = req.WithContext(ctx)
-			resp, err := client.Do(req)
-			if err != nil {
-				t.Errorf("could not send a request: %s", err)
-				return
-			}
-			defer resp.Body.Close()
-			if resp.StatusCode != 200 {
-				t.Errorf("StatusCode wants 200 but %d", resp.StatusCode)
-			}
-		})
-	return b
-}

integration_test/httpdriver/http_driver.go

@@ -0,0 +1,70 @@
+// 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
+}

integration_test/idp/mock_idp/mock_idp.go

@@ -1,122 +0,0 @@
-// Code generated by MockGen. DO NOT EDIT.
-// Source: github.com/int128/kubelogin/integration_test/idp (interfaces: Provider)
-
-// Package mock_idp is a generated GoMock package.
-package mock_idp
-
-import (
-	gomock "github.com/golang/mock/gomock"
-	idp "github.com/int128/kubelogin/integration_test/idp"
-	reflect "reflect"
-)
-
-// MockProvider is a mock of Provider interface
-type MockProvider struct {
-	ctrl     *gomock.Controller
-	recorder *MockProviderMockRecorder
-}
-
-// MockProviderMockRecorder is the mock recorder for MockProvider
-type MockProviderMockRecorder struct {
-	mock *MockProvider
-}
-
-// NewMockProvider creates a new mock instance
-func NewMockProvider(ctrl *gomock.Controller) *MockProvider {
-	mock := &MockProvider{ctrl: ctrl}
-	mock.recorder = &MockProviderMockRecorder{mock}
-	return mock
-}
-
-// EXPECT returns an object that allows the caller to indicate expected use
-func (m *MockProvider) EXPECT() *MockProviderMockRecorder {
-	return m.recorder
-}
-
-// AuthenticateCode mocks base method
-func (m *MockProvider) AuthenticateCode(arg0, arg1 string) (string, error) {
-	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "AuthenticateCode", arg0, arg1)
-	ret0, _ := ret[0].(string)
-	ret1, _ := ret[1].(error)
-	return ret0, ret1
-}
-
-// AuthenticateCode indicates an expected call of AuthenticateCode
-func (mr *MockProviderMockRecorder) AuthenticateCode(arg0, arg1 interface{}) *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "AuthenticateCode", reflect.TypeOf((*MockProvider)(nil).AuthenticateCode), arg0, arg1)
-}
-
-// AuthenticatePassword mocks base method
-func (m *MockProvider) AuthenticatePassword(arg0, arg1, arg2 string) (*idp.TokenResponse, error) {
-	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "AuthenticatePassword", arg0, arg1, arg2)
-	ret0, _ := ret[0].(*idp.TokenResponse)
-	ret1, _ := ret[1].(error)
-	return ret0, ret1
-}
-
-// AuthenticatePassword indicates an expected call of AuthenticatePassword
-func (mr *MockProviderMockRecorder) AuthenticatePassword(arg0, arg1, arg2 interface{}) *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "AuthenticatePassword", reflect.TypeOf((*MockProvider)(nil).AuthenticatePassword), arg0, arg1, arg2)
-}
-
-// Discovery mocks base method
-func (m *MockProvider) Discovery() *idp.DiscoveryResponse {
-	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "Discovery")
-	ret0, _ := ret[0].(*idp.DiscoveryResponse)
-	return ret0
-}
-
-// Discovery indicates an expected call of Discovery
-func (mr *MockProviderMockRecorder) Discovery() *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Discovery", reflect.TypeOf((*MockProvider)(nil).Discovery))
-}
-
-// Exchange mocks base method
-func (m *MockProvider) Exchange(arg0 string) (*idp.TokenResponse, error) {
-	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "Exchange", arg0)
-	ret0, _ := ret[0].(*idp.TokenResponse)
-	ret1, _ := ret[1].(error)
-	return ret0, ret1
-}
-
-// Exchange indicates an expected call of Exchange
-func (mr *MockProviderMockRecorder) Exchange(arg0 interface{}) *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Exchange", reflect.TypeOf((*MockProvider)(nil).Exchange), arg0)
-}
-
-// GetCertificates mocks base method
-func (m *MockProvider) GetCertificates() *idp.CertificatesResponse {
-	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "GetCertificates")
-	ret0, _ := ret[0].(*idp.CertificatesResponse)
-	return ret0
-}
-
-// GetCertificates indicates an expected call of GetCertificates
-func (mr *MockProviderMockRecorder) GetCertificates() *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "GetCertificates", reflect.TypeOf((*MockProvider)(nil).GetCertificates))
-}
-
-// Refresh mocks base method
-func (m *MockProvider) Refresh(arg0 string) (*idp.TokenResponse, error) {
-	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "Refresh", arg0)
-	ret0, _ := ret[0].(*idp.TokenResponse)
-	ret1, _ := ret[1].(error)
-	return ret0, ret1
-}
-
-// Refresh indicates an expected call of Refresh
-func (mr *MockProviderMockRecorder) Refresh(arg0 interface{}) *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Refresh", reflect.TypeOf((*MockProvider)(nil).Refresh), arg0)
-}

integration_test/keypair/keypair.go

@@ -1,4 +1,4 @@
-package keys
+package keypair
 
 import (
 	"crypto/tls"
@@ -10,8 +10,8 @@ import (
 	"strings"
 )
 
-// Keys represents a pair of certificate and key.
-type Keys struct {
+// KeyPair represents a pair of certificate and key.
+type KeyPair struct {
 	CertPath     string
 	KeyPath      string
 	CACertPath   string
@@ -20,16 +20,16 @@ type Keys struct {
 }
 
 // None represents non-TLS.
-var None Keys
+var None KeyPair
 
-// Server is a Keys for TLS server.
+// Server is a KeyPair for TLS server.
 // These files should be generated by Makefile before test.
-var Server = Keys{
-	CertPath:     "keys/testdata/server.crt",
-	KeyPath:      "keys/testdata/server.key",
-	CACertPath:   "keys/testdata/ca.crt",
-	CACertBase64: readAsBase64("keys/testdata/ca.crt"),
-	TLSConfig:    newTLSConfig("keys/testdata/ca.crt"),
+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 {

integration_test/kubeconfig/kubeconfig.go

@@ -2,8 +2,8 @@ package kubeconfig
 
 import (
 	"html/template"
-	"io/ioutil"
 	"os"
+	"path/filepath"
 	"testing"
 
 	"gopkg.in/yaml.v2"
@@ -22,7 +22,7 @@ type Values struct {
 // Create creates a kubeconfig file and returns path to it.
 func Create(t *testing.T, v *Values) string {
 	t.Helper()
-	f, err := ioutil.TempFile("", "kubeconfig")
+	f, err := os.Create(filepath.Join(t.TempDir(), "kubeconfig"))
 	if err != nil {
 		t.Fatal(err)
 	}

integration_test/oidcserver/handler/handler.go

@@ -1,4 +1,5 @@
-package idp
+// Package handler provides a HTTP handler for the OpenID Connect Provider.
+package handler
 
 import (
 	"encoding/json"
@@ -9,7 +10,7 @@ import (
 	"golang.org/x/xerrors"
 )
 
-func NewHandler(t *testing.T, provider Provider) *Handler {
+func New(t *testing.T, provider Provider) *Handler {
 	return &Handler{t, provider}
 }
 
@@ -71,11 +72,17 @@ func (h *Handler) serveHTTP(w http.ResponseWriter, r *http.Request) error {
 			return xerrors.Errorf("could not render json: %w", err)
 		}
 	case m == "GET" && p == "/auth":
-		// 3.1.2.1. Authentication Request
-		// https://openid.net/specs/openid-connect-core-1_0.html#AuthRequest
 		q := r.URL.Query()
-		redirectURI, scope, state, nonce := q.Get("redirect_uri"), q.Get("scope"), q.Get("state"), q.Get("nonce")
-		code, err := h.provider.AuthenticateCode(scope, nonce)
+		redirectURI, state := q.Get("redirect_uri"), q.Get("state")
+		code, err := h.provider.AuthenticateCode(AuthenticationRequest{
+			RedirectURI:         redirectURI,
+			State:               state,
+			Scope:               q.Get("scope"),
+			Nonce:               q.Get("nonce"),
+			CodeChallenge:       q.Get("code_challenge"),
+			CodeChallengeMethod: q.Get("code_challenge_method"),
+			RawQuery:            q,
+		})
 		if err != nil {
 			return xerrors.Errorf("authentication error: %w", err)
 		}
@@ -88,10 +95,10 @@ func (h *Handler) serveHTTP(w http.ResponseWriter, r *http.Request) error {
 		grantType := r.Form.Get("grant_type")
 		switch grantType {
 		case "authorization_code":
-			// 3.1.3.1. Token Request
-			// https://openid.net/specs/openid-connect-core-1_0.html#TokenRequest
-			code := r.Form.Get("code")
-			tokenResponse, err := h.provider.Exchange(code)
+			tokenResponse, err := h.provider.Exchange(TokenRequest{
+				Code:         r.Form.Get("code"),
+				CodeVerifier: r.Form.Get("code_verifier"),
+			})
 			if err != nil {
 				return xerrors.Errorf("token request error: %w", err)
 			}

integration_test/oidcserver/handler/types.go

@@ -1,13 +1,8 @@
-// Package idp provides a test double of an OpenID Connect Provider.
-package idp
-
-//go:generate mockgen -destination mock_idp/mock_idp.go github.com/int128/kubelogin/integration_test/idp Provider
+package handler
 
 import (
-	"crypto/rsa"
-	"encoding/base64"
 	"fmt"
-	"math/big"
+	"net/url"
 )
 
 // Provider provides discovery and authentication methods.
@@ -17,8 +12,8 @@ import (
 type Provider interface {
 	Discovery() *DiscoveryResponse
 	GetCertificates() *CertificatesResponse
-	AuthenticateCode(scope, nonce string) (code string, err error)
-	Exchange(code string) (*TokenResponse, error)
+	AuthenticateCode(req AuthenticationRequest) (code string, err error)
+	Exchange(req TokenRequest) (*TokenResponse, error)
 	AuthenticatePassword(username, password, scope string) (*TokenResponse, error)
 	Refresh(refreshToken string) (*TokenResponse, error)
 }
@@ -39,26 +34,6 @@ type DiscoveryResponse struct {
 	CodeChallengeMethodsSupported     []string `json:"code_challenge_methods_supported"`
 }
 
-// NewDiscoveryResponse returns a DiscoveryResponse for the local server.
-// This is based on https://accounts.google.com/.well-known/openid-configuration.
-func NewDiscoveryResponse(issuer string) *DiscoveryResponse {
-	return &DiscoveryResponse{
-		Issuer:                            issuer,
-		AuthorizationEndpoint:             issuer + "/auth",
-		TokenEndpoint:                     issuer + "/token",
-		JwksURI:                           issuer + "/certs",
-		UserinfoEndpoint:                  issuer + "/userinfo",
-		RevocationEndpoint:                issuer + "/revoke",
-		ResponseTypesSupported:            []string{"code id_token"},
-		SubjectTypesSupported:             []string{"public"},
-		IDTokenSigningAlgValuesSupported:  []string{"RS256"},
-		ScopesSupported:                   []string{"openid", "email", "profile"},
-		TokenEndpointAuthMethodsSupported: []string{"client_secret_post", "client_secret_basic"},
-		CodeChallengeMethodsSupported:     []string{"plain", "S256"},
-		ClaimsSupported:                   []string{"aud", "email", "exp", "iat", "iss", "name", "sub"},
-	}
-}
-
 type CertificatesResponse struct {
 	Keys []*CertificatesResponseKey `json:"keys"`
 }
@@ -72,21 +47,23 @@ type CertificatesResponseKey struct {
 	E   string `json:"e"`
 }
 
-// NewCertificatesResponse returns a CertificatesResponse using the key pair.
-// This is used for verifying a signature of ID token.
-func NewCertificatesResponse(idTokenKeyPair *rsa.PrivateKey) *CertificatesResponse {
-	return &CertificatesResponse{
-		Keys: []*CertificatesResponseKey{
-			{
-				Kty: "RSA",
-				Alg: "RS256",
-				Use: "sig",
-				Kid: "dummy",
-				E:   base64.RawURLEncoding.EncodeToString(big.NewInt(int64(idTokenKeyPair.E)).Bytes()),
-				N:   base64.RawURLEncoding.EncodeToString(idTokenKeyPair.N.Bytes()),
-			},
-		},
-	}
+// AuthenticationRequest represents a type of:
+// https://openid.net/specs/openid-connect-core-1_0.html#AuthRequest
+type AuthenticationRequest struct {
+	RedirectURI         string
+	State               string
+	Scope               string // space separated string
+	Nonce               string
+	CodeChallenge       string
+	CodeChallengeMethod string
+	RawQuery            url.Values
+}
+
+// TokenRequest represents a type of:
+// https://openid.net/specs/openid-connect-core-1_0.html#TokenRequest
+type TokenRequest struct {
+	Code         string
+	CodeVerifier string
 }
 
 type TokenResponse struct {
@@ -97,17 +74,6 @@ type TokenResponse struct {
 	IDToken      string `json:"id_token"`
 }
 
-// NewTokenResponse returns a TokenResponse.
-func NewTokenResponse(idToken, refreshToken string) *TokenResponse {
-	return &TokenResponse{
-		TokenType:    "Bearer",
-		ExpiresIn:    3600,
-		AccessToken:  "YOUR_ACCESS_TOKEN",
-		IDToken:      idToken,
-		RefreshToken: refreshToken,
-	}
-}
-
 // ErrorResponse represents an error response described in the following section:
 // 5.2 Error Response
 // https://tools.ietf.org/html/rfc6749#section-5.2

integration_test/oidcserver/http/http.go

@@ -1,7 +1,5 @@
-// Package localserver provides a http server running on localhost.
-// This is only for testing.
-//
-package localserver
+// Package http provides a http server running on localhost for testing.
+package http
 
 import (
 	"context"
@@ -9,7 +7,7 @@ import (
 	"net/http"
 	"testing"
 
-	"github.com/int128/kubelogin/integration_test/keys"
+	"github.com/int128/kubelogin/integration_test/keypair"
 )
 
 type Shutdowner interface {
@@ -17,28 +15,23 @@ type Shutdowner interface {
 }
 
 type shutdowner struct {
-	l net.Listener
 	s *http.Server
 }
 
 func (s *shutdowner) Shutdown(t *testing.T, ctx context.Context) {
-	// s.Shutdown() closes the lister as well,
-	// so we do not need to call l.Close() explicitly
 	if err := s.s.Shutdown(ctx); err != nil {
-		t.Errorf("Could not shutdown the server: %s", err)
+		t.Errorf("could not shutdown the server: %s", err)
 	}
 }
 
-// Start starts an authentication server.
-// If k is non-nil, it starts a TLS server.
-func Start(t *testing.T, h http.Handler, k keys.Keys) (string, Shutdowner) {
-	if k == keys.None {
+func Start(t *testing.T, h http.Handler, k keypair.KeyPair) (string, Shutdowner) {
+	if k == keypair.None {
 		return startNoTLS(t, h)
 	}
 	return startTLS(t, h, k)
 }
 
-func startNoTLS(t *testing.T, h http.Handler) (string, Shutdowner) {
+func startNoTLS(t *testing.T, h http.Handler) (string, *shutdowner) {
 	t.Helper()
 	l, port := newLocalhostListener(t)
 	url := "http://localhost:" + port
@@ -51,10 +44,10 @@ func startNoTLS(t *testing.T, h http.Handler) (string, Shutdowner) {
 			t.Error(err)
 		}
 	}()
-	return url, &shutdowner{l, s}
+	return url, &shutdowner{s}
 }
 
-func startTLS(t *testing.T, h http.Handler, k keys.Keys) (string, Shutdowner) {
+func startTLS(t *testing.T, h http.Handler, k keypair.KeyPair) (string, *shutdowner) {
 	t.Helper()
 	l, port := newLocalhostListener(t)
 	url := "https://localhost:" + port
@@ -67,7 +60,7 @@ func startTLS(t *testing.T, h http.Handler, k keys.Keys) (string, Shutdowner) {
 			t.Error(err)
 		}
 	}()
-	return url, &shutdowner{l, s}
+	return url, &shutdowner{s}
 }
 
 func newLocalhostListener(t *testing.T) (net.Listener, string) {

integration_test/oidcserver/server.go

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

integration_test/standalone_test.go

@@ -6,16 +6,13 @@ import (
 	"testing"
 	"time"
 
-	"github.com/golang/mock/gomock"
-	"github.com/int128/kubelogin/integration_test/idp"
-	"github.com/int128/kubelogin/integration_test/idp/mock_idp"
-	"github.com/int128/kubelogin/integration_test/keys"
+	"github.com/int128/kubelogin/integration_test/httpdriver"
+	"github.com/int128/kubelogin/integration_test/keypair"
 	"github.com/int128/kubelogin/integration_test/kubeconfig"
-	"github.com/int128/kubelogin/integration_test/localserver"
+	"github.com/int128/kubelogin/integration_test/oidcserver"
 	"github.com/int128/kubelogin/pkg/adaptors/browser"
-	"github.com/int128/kubelogin/pkg/adaptors/browser/mock_browser"
 	"github.com/int128/kubelogin/pkg/di"
-	"github.com/int128/kubelogin/pkg/testing/jwt"
+	"github.com/int128/kubelogin/pkg/testing/clock"
 	"github.com/int128/kubelogin/pkg/testing/logger"
 )
 
@@ -27,207 +24,246 @@ import (
 // 4. Verify the kubeconfig.
 //
 func TestStandalone(t *testing.T) {
-	t.Run("NoTLS", func(t *testing.T) {
-		testStandalone(t, keys.None)
-	})
-	t.Run("TLS", func(t *testing.T) {
-		testStandalone(t, keys.Server)
-	})
-}
+	timeout := 3 * time.Second
+	now := time.Date(2020, 1, 1, 0, 0, 0, 0, time.UTC)
 
-func testStandalone(t *testing.T, idpTLS keys.Keys) {
-	timeout := 5 * time.Second
+	for name, tc := range map[string]struct {
+		keyPair keypair.KeyPair
+		args    []string
+	}{
+		"NoTLS": {},
+		"TLS": {
+			keyPair: keypair.Server,
+		},
+	} {
+		httpDriverOption := httpdriver.Option{
+			TLSConfig:    tc.keyPair.TLSConfig,
+			BodyContains: "Authenticated",
+		}
 
-	t.Run("Defaults", func(t *testing.T) {
+		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()
-		ctrl := gomock.NewController(t)
-		defer ctrl.Finish()
-
-		provider := mock_idp.NewMockProvider(ctrl)
-		serverURL, server := localserver.Start(t, idp.NewHandler(t, provider), idpTLS)
-		defer server.Shutdown(t, ctx)
-		browserMock := newBrowserMock(ctx, t, ctrl, idpTLS)
-		var idToken string
-		setupAuthCodeFlow(t, provider, serverURL, "openid", &idToken)
+		sv := oidcserver.New(t, keypair.Server, oidcserver.Config{
+			Want: oidcserver.Want{
+				Scope:             "openid",
+				RedirectURIPrefix: "http://localhost:",
+			},
+			Response: oidcserver.Response{
+				IDTokenExpiry: now.Add(time.Hour),
+			},
+		})
+		defer sv.Shutdown(t, ctx)
 		kubeConfigFilename := kubeconfig.Create(t, &kubeconfig.Values{
-			Issuer:                  serverURL,
-			IDPCertificateAuthority: idpTLS.CACertPath,
+			Issuer:                      sv.IssuerURL(),
+			IDPCertificateAuthorityData: keypair.Server.CACertBase64,
 		})
 		defer os.Remove(kubeConfigFilename)
-
-		args := []string{
-			"--kubeconfig", kubeConfigFilename,
-		}
-		runRootCmd(t, ctx, browserMock, args)
+		runStandalone(t, ctx, standaloneConfig{
+			issuerURL:          sv.IssuerURL(),
+			kubeConfigFilename: kubeConfigFilename,
+			httpDriver:         httpdriver.New(ctx, t, httpdriver.Option{TLSConfig: keypair.Server.TLSConfig}),
+			now:                now,
+		})
 		kubeconfig.Verify(t, kubeConfigFilename, kubeconfig.AuthProviderConfig{
-			IDToken:      idToken,
-			RefreshToken: "YOUR_REFRESH_TOKEN",
-		})
-	})
-
-	t.Run("ResourceOwnerPasswordCredentials", func(t *testing.T) {
-		t.Parallel()
-		ctx, cancel := context.WithTimeout(context.TODO(), timeout)
-		defer cancel()
-		ctrl := gomock.NewController(t)
-		defer ctrl.Finish()
-
-		provider := mock_idp.NewMockProvider(ctrl)
-		serverURL, server := localserver.Start(t, idp.NewHandler(t, provider), idpTLS)
-		defer server.Shutdown(t, ctx)
-		browserMock := mock_browser.NewMockInterface(ctrl)
-		idToken := newIDToken(t, serverURL, "", tokenExpiryFuture)
-		setupROPCFlow(provider, serverURL, "openid", "USER", "PASS", idToken)
-		kubeConfigFilename := kubeconfig.Create(t, &kubeconfig.Values{
-			Issuer:                  serverURL,
-			IDPCertificateAuthority: idpTLS.CACertPath,
-		})
-		defer os.Remove(kubeConfigFilename)
-
-		args := []string{
-			"--kubeconfig", kubeConfigFilename,
-			"--username", "USER",
-			"--password", "PASS",
-		}
-		runRootCmd(t, ctx, browserMock, args)
-		kubeconfig.Verify(t, kubeConfigFilename, kubeconfig.AuthProviderConfig{
-			IDToken:      idToken,
-			RefreshToken: "YOUR_REFRESH_TOKEN",
-		})
-	})
-
-	t.Run("HasValidToken", func(t *testing.T) {
-		t.Parallel()
-		ctx, cancel := context.WithTimeout(context.TODO(), timeout)
-		defer cancel()
-		ctrl := gomock.NewController(t)
-		defer ctrl.Finish()
-
-		provider := mock_idp.NewMockProvider(ctrl)
-		serverURL, server := localserver.Start(t, idp.NewHandler(t, provider), idpTLS)
-		defer server.Shutdown(t, ctx)
-		idToken := newIDToken(t, serverURL, "YOUR_NONCE", tokenExpiryFuture)
-		browserMock := mock_browser.NewMockInterface(ctrl)
-
-		kubeConfigFilename := kubeconfig.Create(t, &kubeconfig.Values{
-			Issuer:                  serverURL,
-			IDToken:                 idToken,
-			RefreshToken:            "YOUR_REFRESH_TOKEN",
-			IDPCertificateAuthority: idpTLS.CACertPath,
-		})
-		defer os.Remove(kubeConfigFilename)
-
-		args := []string{
-			"--kubeconfig", kubeConfigFilename,
-		}
-		runRootCmd(t, ctx, browserMock, args)
-		kubeconfig.Verify(t, kubeConfigFilename, kubeconfig.AuthProviderConfig{
-			IDToken:      idToken,
-			RefreshToken: "YOUR_REFRESH_TOKEN",
-		})
-	})
-
-	t.Run("HasValidRefreshToken", func(t *testing.T) {
-		t.Parallel()
-		ctx, cancel := context.WithTimeout(context.TODO(), timeout)
-		defer cancel()
-		ctrl := gomock.NewController(t)
-		defer ctrl.Finish()
-
-		provider := mock_idp.NewMockProvider(ctrl)
-		serverURL, server := localserver.Start(t, idp.NewHandler(t, provider), idpTLS)
-		defer server.Shutdown(t, ctx)
-		idToken := newIDToken(t, serverURL, "YOUR_NONCE", tokenExpiryFuture)
-		provider.EXPECT().Discovery().Return(idp.NewDiscoveryResponse(serverURL))
-		provider.EXPECT().GetCertificates().Return(idp.NewCertificatesResponse(jwt.PrivateKey))
-		provider.EXPECT().Refresh("VALID_REFRESH_TOKEN").
-			Return(idp.NewTokenResponse(idToken, "NEW_REFRESH_TOKEN"), nil)
-		browserMock := mock_browser.NewMockInterface(ctrl)
-
-		kubeConfigFilename := kubeconfig.Create(t, &kubeconfig.Values{
-			Issuer:                  serverURL,
-			IDToken:                 newIDToken(t, serverURL, "YOUR_NONCE", tokenExpiryPast), // expired
-			RefreshToken:            "VALID_REFRESH_TOKEN",
-			IDPCertificateAuthority: idpTLS.CACertPath,
-		})
-		defer os.Remove(kubeConfigFilename)
-
-		args := []string{
-			"--kubeconfig", kubeConfigFilename,
-		}
-		runRootCmd(t, ctx, browserMock, args)
-		kubeconfig.Verify(t, kubeConfigFilename, kubeconfig.AuthProviderConfig{
-			IDToken:      idToken,
-			RefreshToken: "NEW_REFRESH_TOKEN",
-		})
-	})
-
-	t.Run("HasExpiredRefreshToken", func(t *testing.T) {
-		t.Parallel()
-		ctx, cancel := context.WithTimeout(context.TODO(), timeout)
-		defer cancel()
-		ctrl := gomock.NewController(t)
-		defer ctrl.Finish()
-
-		provider := mock_idp.NewMockProvider(ctrl)
-		serverURL, server := localserver.Start(t, idp.NewHandler(t, provider), idpTLS)
-		defer server.Shutdown(t, ctx)
-		var idToken string
-		setupAuthCodeFlow(t, provider, serverURL, "openid", &idToken)
-		provider.EXPECT().Refresh("EXPIRED_REFRESH_TOKEN").
-			Return(nil, &idp.ErrorResponse{Code: "invalid_request", Description: "token has expired"}).
-			MaxTimes(2) // package oauth2 will retry refreshing the token
-		browserMock := newBrowserMock(ctx, t, ctrl, idpTLS)
-
-		kubeConfigFilename := kubeconfig.Create(t, &kubeconfig.Values{
-			Issuer:                  serverURL,
-			IDToken:                 newIDToken(t, serverURL, "YOUR_NONCE", tokenExpiryPast), // expired
-			RefreshToken:            "EXPIRED_REFRESH_TOKEN",
-			IDPCertificateAuthority: idpTLS.CACertPath,
-		})
-		defer os.Remove(kubeConfigFilename)
-
-		args := []string{
-			"--kubeconfig", kubeConfigFilename,
-		}
-		runRootCmd(t, ctx, browserMock, args)
-		kubeconfig.Verify(t, kubeConfigFilename, kubeconfig.AuthProviderConfig{
-			IDToken:      idToken,
-			RefreshToken: "YOUR_REFRESH_TOKEN",
+			IDToken:      sv.LastTokenResponse().IDToken,
+			RefreshToken: sv.LastTokenResponse().RefreshToken,
 		})
 	})
 
 	t.Run("env_KUBECONFIG", func(t *testing.T) {
-		// do not run this in parallel due to change of the env var
 		ctx, cancel := context.WithTimeout(context.TODO(), timeout)
 		defer cancel()
-		ctrl := gomock.NewController(t)
-		defer ctrl.Finish()
-
-		provider := mock_idp.NewMockProvider(ctrl)
-		serverURL, server := localserver.Start(t, idp.NewHandler(t, provider), idpTLS)
-		defer server.Shutdown(t, ctx)
-		var idToken string
-		setupAuthCodeFlow(t, provider, serverURL, "openid", &idToken)
-		browserMock := newBrowserMock(ctx, t, ctrl, idpTLS)
-
+		sv := oidcserver.New(t, keypair.None, oidcserver.Config{
+			Want: oidcserver.Want{
+				Scope:             "openid",
+				RedirectURIPrefix: "http://localhost:",
+			},
+			Response: oidcserver.Response{
+				IDTokenExpiry: now.Add(time.Hour),
+			},
+		})
+		defer sv.Shutdown(t, ctx)
 		kubeConfigFilename := kubeconfig.Create(t, &kubeconfig.Values{
-			Issuer:                  serverURL,
-			IDPCertificateAuthority: idpTLS.CACertPath,
+			Issuer: sv.IssuerURL(),
 		})
 		defer os.Remove(kubeConfigFilename)
 		setenv(t, "KUBECONFIG", kubeConfigFilename+string(os.PathListSeparator)+"kubeconfig/testdata/dummy.yaml")
 		defer unsetenv(t, "KUBECONFIG")
-
-		args := []string{
-			"--kubeconfig", kubeConfigFilename,
-		}
-		runRootCmd(t, ctx, browserMock, args)
+		runStandalone(t, ctx, standaloneConfig{
+			issuerURL:  sv.IssuerURL(),
+			httpDriver: httpdriver.New(ctx, t, httpdriver.Option{}),
+			now:        now,
+		})
 		kubeconfig.Verify(t, kubeConfigFilename, kubeconfig.AuthProviderConfig{
-			IDToken:      idToken,
-			RefreshToken: "YOUR_REFRESH_TOKEN",
+			IDToken:      sv.LastTokenResponse().IDToken,
+			RefreshToken: sv.LastTokenResponse().RefreshToken,
 		})
 	})
 
@@ -235,42 +271,49 @@ func testStandalone(t *testing.T, idpTLS keys.Keys) {
 		t.Parallel()
 		ctx, cancel := context.WithTimeout(context.TODO(), timeout)
 		defer cancel()
-		ctrl := gomock.NewController(t)
-		defer ctrl.Finish()
-
-		provider := mock_idp.NewMockProvider(ctrl)
-		serverURL, server := localserver.Start(t, idp.NewHandler(t, provider), idpTLS)
-		defer server.Shutdown(t, ctx)
-		var idToken string
-		setupAuthCodeFlow(t, provider, serverURL, "profile groups openid", &idToken)
-		browserMock := newBrowserMock(ctx, t, ctrl, idpTLS)
-
+		sv := oidcserver.New(t, keypair.None, oidcserver.Config{
+			Want: oidcserver.Want{
+				Scope:             "profile groups openid",
+				RedirectURIPrefix: "http://localhost:",
+			},
+			Response: oidcserver.Response{
+				IDTokenExpiry: now.Add(time.Hour),
+			},
+		})
+		defer sv.Shutdown(t, ctx)
 		kubeConfigFilename := kubeconfig.Create(t, &kubeconfig.Values{
-			Issuer:                  serverURL,
-			ExtraScopes:             "profile,groups",
-			IDPCertificateAuthority: idpTLS.CACertPath,
+			Issuer:      sv.IssuerURL(),
+			ExtraScopes: "profile,groups",
 		})
 		defer os.Remove(kubeConfigFilename)
-
-		args := []string{
-			"--kubeconfig", kubeConfigFilename,
-		}
-		runRootCmd(t, ctx, browserMock, args)
+		runStandalone(t, ctx, standaloneConfig{
+			issuerURL:          sv.IssuerURL(),
+			kubeConfigFilename: kubeConfigFilename,
+			httpDriver:         httpdriver.New(ctx, t, httpdriver.Option{}),
+			now:                now,
+		})
 		kubeconfig.Verify(t, kubeConfigFilename, kubeconfig.AuthProviderConfig{
-			IDToken:      idToken,
-			RefreshToken: "YOUR_REFRESH_TOKEN",
+			IDToken:      sv.LastTokenResponse().IDToken,
+			RefreshToken: sv.LastTokenResponse().RefreshToken,
 		})
 	})
 }
 
-func runRootCmd(t *testing.T, ctx context.Context, b browser.Interface, args []string) {
-	t.Helper()
-	cmd := di.NewCmdForHeadless(logger.New(t), b, nil)
+type standaloneConfig struct {
+	issuerURL          string
+	kubeConfigFilename string
+	httpDriver         browser.Interface
+	now                time.Time
+	args               []string
+}
+
+func runStandalone(t *testing.T, ctx context.Context, cfg standaloneConfig) {
+	cmd := di.NewCmdForHeadless(clock.Fake(cfg.now), os.Stdin, os.Stdout, logger.New(t), cfg.httpDriver)
 	exitCode := cmd.Run(ctx, append([]string{
 		"kubelogin",
-		"--v=1",
+		"--kubeconfig", cfg.kubeConfigFilename,
 		"--listen-address", "127.0.0.1:0",
-	}, args...), "HEAD")
+	}, cfg.args...), "HEAD")
 	if exitCode != 0 {
 		t.Errorf("exit status wants 0 but %d", exitCode)
 	}

pkg/adaptors/browser/mock_browser/mock_browser.go

@@ -9,30 +9,30 @@ import (
 	reflect "reflect"
 )
 
-// MockInterface is a mock of Interface interface
+// MockInterface is a mock of Interface interface.
 type MockInterface struct {
 	ctrl     *gomock.Controller
 	recorder *MockInterfaceMockRecorder
 }
 
-// MockInterfaceMockRecorder is the mock recorder for MockInterface
+// MockInterfaceMockRecorder is the mock recorder for MockInterface.
 type MockInterfaceMockRecorder struct {
 	mock *MockInterface
 }
 
-// NewMockInterface creates a new mock instance
+// NewMockInterface creates a new mock instance.
 func NewMockInterface(ctrl *gomock.Controller) *MockInterface {
 	mock := &MockInterface{ctrl: ctrl}
 	mock.recorder = &MockInterfaceMockRecorder{mock}
 	return mock
 }
 
-// EXPECT returns an object that allows the caller to indicate expected use
+// EXPECT returns an object that allows the caller to indicate expected use.
 func (m *MockInterface) EXPECT() *MockInterfaceMockRecorder {
 	return m.recorder
 }
 
-// Open mocks base method
+// Open mocks base method.
 func (m *MockInterface) Open(arg0 string) error {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "Open", arg0)
@@ -40,7 +40,7 @@ func (m *MockInterface) Open(arg0 string) error {
 	return ret0
 }
 
-// Open indicates an expected call of Open
+// 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)

pkg/adaptors/certpool/mock_certpool/mock_certpool.go

@@ -10,30 +10,30 @@ import (
 	reflect "reflect"
 )
 
-// MockInterface is a mock of Interface interface
+// MockInterface is a mock of Interface interface.
 type MockInterface struct {
 	ctrl     *gomock.Controller
 	recorder *MockInterfaceMockRecorder
 }
 
-// MockInterfaceMockRecorder is the mock recorder for MockInterface
+// MockInterfaceMockRecorder is the mock recorder for MockInterface.
 type MockInterfaceMockRecorder struct {
 	mock *MockInterface
 }
 
-// NewMockInterface creates a new mock instance
+// NewMockInterface creates a new mock instance.
 func NewMockInterface(ctrl *gomock.Controller) *MockInterface {
 	mock := &MockInterface{ctrl: ctrl}
 	mock.recorder = &MockInterfaceMockRecorder{mock}
 	return mock
 }
 
-// EXPECT returns an object that allows the caller to indicate expected use
+// EXPECT returns an object that allows the caller to indicate expected use.
 func (m *MockInterface) EXPECT() *MockInterfaceMockRecorder {
 	return m.recorder
 }
 
-// AddBase64Encoded mocks base method
+// AddBase64Encoded mocks base method.
 func (m *MockInterface) AddBase64Encoded(arg0 string) error {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "AddBase64Encoded", arg0)
@@ -41,13 +41,13 @@ func (m *MockInterface) AddBase64Encoded(arg0 string) error {
 	return ret0
 }
 
-// AddBase64Encoded indicates an expected call of AddBase64Encoded
+// 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
+// AddFile mocks base method.
 func (m *MockInterface) AddFile(arg0 string) error {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "AddFile", arg0)
@@ -55,19 +55,19 @@ func (m *MockInterface) AddFile(arg0 string) error {
 	return ret0
 }
 
-// AddFile indicates an expected call of AddFile
+// 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
+// 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
+// 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)

pkg/adaptors/clock/clock.go

@@ -8,17 +8,17 @@ import (
 )
 
 var Set = wire.NewSet(
-	wire.Struct(new(Clock), "*"),
-	wire.Bind(new(Interface), new(*Clock)),
+	wire.Struct(new(Real), "*"),
+	wire.Bind(new(Interface), new(*Real)),
 )
 
 type Interface interface {
 	Now() time.Time
 }
 
-type Clock struct{}
+type Real struct{}
 
 // Now returns the current time.
-func (c *Clock) Now() time.Time {
+func (c *Real) Now() time.Time {
 	return time.Now()
 }

pkg/adaptors/cmd/authentication.go

@@ -0,0 +1,97 @@
+package cmd
+
+import (
+	"fmt"
+	"strings"
+	"time"
+
+	"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
+	AuthenticationTimeoutSec   int
+	SkipOpenBrowser            bool
+	LocalServerCertFile        string
+	LocalServerKeyFile         string
+	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.IntVar(&o.AuthenticationTimeoutSec, "authentication-timeout-sec", defaultAuthenticationTimeoutSec, "[authcode] Timeout of authentication in seconds")
+	f.StringVar(&o.LocalServerCertFile, "local-server-cert", "", "[authcode] Certificate path for the local server")
+	f.StringVar(&o.LocalServerKeyFile, "local-server-key", "", "[authcode] Certificate key path for the local server")
+	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,
+			AuthenticationTimeout:      time.Duration(o.AuthenticationTimeoutSec) * time.Second,
+			LocalServerCertFile:        o.LocalServerCertFile,
+			LocalServerKeyFile:         o.LocalServerKeyFile,
+			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
+}

pkg/adaptors/cmd/cmd.go

@@ -2,6 +2,7 @@ package cmd
 
 import (
 	"context"
+	"runtime"
 
 	"github.com/google/wire"
 	"github.com/int128/kubelogin/pkg/adaptors/logger"
@@ -25,6 +26,8 @@ type Interface interface {
 var defaultListenAddress = []string{"127.0.0.1:8000", "127.0.0.1:18000"}
 var defaultTokenCacheDir = homedir.HomeDir() + "/.kube/cache/oidc-login"
 
+const defaultAuthenticationTimeoutSec = 180
+
 // Cmd provides interaction with command line interface (CLI).
 type Cmd struct {
 	Root     *Root
@@ -52,7 +55,7 @@ func (cmd *Cmd) Run(ctx context.Context, args []string, version string) int {
 		Short: "Print the version information",
 		Args:  cobra.NoArgs,
 		Run: func(*cobra.Command, []string) {
-			cmd.Logger.Printf("kubelogin version %s", version)
+			cmd.Logger.Printf("kubelogin version %s (%s %s_%s)", version, runtime.Version(), runtime.GOOS, runtime.GOARCH)
 		},
 	}
 	rootCmd.AddCommand(versionCmd)

pkg/adaptors/cmd/cmd_test.go

@@ -3,10 +3,13 @@ package cmd
 import (
 	"context"
 	"testing"
+	"time"
 
 	"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"
@@ -26,8 +29,10 @@ func TestCmd_Run(t *testing.T) {
 				args: []string{executable},
 				in: standalone.Input{
 					GrantOptionSet: authentication.GrantOptionSet{
-						AuthCodeOption: &authentication.AuthCodeOption{
-							BindAddress: defaultListenAddress,
+						AuthCodeBrowserOption: &authcode.BrowserOption{
+							BindAddress:           defaultListenAddress,
+							AuthenticationTimeout: defaultAuthenticationTimeoutSec * time.Second,
+							RedirectURLHostname:   "localhost",
 						},
 					},
 				},
@@ -40,8 +45,10 @@ func TestCmd_Run(t *testing.T) {
 				},
 				in: standalone.Input{
 					GrantOptionSet: authentication.GrantOptionSet{
-						AuthCodeOption: &authentication.AuthCodeOption{
-							BindAddress: []string{"127.0.0.1:10080", "127.0.0.1:20080"},
+						AuthCodeBrowserOption: &authcode.BrowserOption{
+							BindAddress:           []string{"127.0.0.1:10080", "127.0.0.1:20080"},
+							AuthenticationTimeout: defaultAuthenticationTimeoutSec * time.Second,
+							RedirectURLHostname:   "localhost",
 						},
 					},
 				},
@@ -56,8 +63,10 @@ func TestCmd_Run(t *testing.T) {
 				},
 				in: standalone.Input{
 					GrantOptionSet: authentication.GrantOptionSet{
-						AuthCodeOption: &authentication.AuthCodeOption{
-							BindAddress: []string{"127.0.0.1:10080", "127.0.0.1:20080"},
+						AuthCodeBrowserOption: &authcode.BrowserOption{
+							BindAddress:           []string{"127.0.0.1:10080", "127.0.0.1:20080"},
+							AuthenticationTimeout: defaultAuthenticationTimeoutSec * time.Second,
+							RedirectURLHostname:   "localhost",
 						},
 					},
 				},
@@ -68,12 +77,17 @@ func TestCmd_Run(t *testing.T) {
 					"--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",
+					"--authentication-timeout-sec", "10",
+					"--local-server-cert", "/path/to/local-server-cert",
+					"--local-server-key", "/path/to/local-server-key",
+					"--open-url-after-authentication", "https://example.com/success.html",
 					"--username", "USER",
 					"--password", "PASS",
 				},
@@ -82,11 +96,17 @@ func TestCmd_Run(t *testing.T) {
 					KubeconfigContext:  "hello.k8s.local",
 					KubeconfigUser:     "google",
 					CACertFilename:     "/path/to/cacert",
+					CACertData:         "BASE64ENCODED",
 					SkipTLSVerify:      true,
 					GrantOptionSet: authentication.GrantOptionSet{
-						AuthCodeOption: &authentication.AuthCodeOption{
-							BindAddress:     []string{"127.0.0.1:10080", "127.0.0.1:20080"},
-							SkipOpenBrowser: true,
+						AuthCodeBrowserOption: &authcode.BrowserOption{
+							BindAddress:                []string{"127.0.0.1:10080", "127.0.0.1:20080"},
+							SkipOpenBrowser:            true,
+							AuthenticationTimeout:      10 * time.Second,
+							LocalServerCertFile:        "/path/to/local-server-cert",
+							LocalServerKeyFile:         "/path/to/local-server-key",
+							OpenURLAfterAuthentication: "https://example.com/success.html",
+							RedirectURLHostname:        "localhost",
 						},
 					},
 				},
@@ -97,7 +117,7 @@ func TestCmd_Run(t *testing.T) {
 				},
 				in: standalone.Input{
 					GrantOptionSet: authentication.GrantOptionSet{
-						AuthCodeKeyboardOption: &authentication.AuthCodeKeyboardOption{},
+						AuthCodeKeyboardOption: &authcode.KeyboardOption{},
 					},
 				},
 			},
@@ -111,7 +131,7 @@ func TestCmd_Run(t *testing.T) {
 				},
 				in: standalone.Input{
 					GrantOptionSet: authentication.GrantOptionSet{
-						ROPCOption: &authentication.ROPCOption{
+						ROPCOption: &ropc.Option{
 							Username: "USER",
 							Password: "PASS",
 						},
@@ -127,7 +147,7 @@ func TestCmd_Run(t *testing.T) {
 				},
 				in: standalone.Input{
 					GrantOptionSet: authentication.GrantOptionSet{
-						ROPCOption: &authentication.ROPCOption{
+						ROPCOption: &ropc.Option{
 							Username: "USER",
 							Password: "PASS",
 						},
@@ -190,8 +210,10 @@ func TestCmd_Run(t *testing.T) {
 					IssuerURL:     "https://issuer.example.com",
 					ClientID:      "YOUR_CLIENT_ID",
 					GrantOptionSet: authentication.GrantOptionSet{
-						AuthCodeOption: &authentication.AuthCodeOption{
-							BindAddress: []string{"127.0.0.1:8000", "127.0.0.1:18000"},
+						AuthCodeBrowserOption: &authcode.BrowserOption{
+							BindAddress:           []string{"127.0.0.1:8000", "127.0.0.1:18000"},
+							AuthenticationTimeout: defaultAuthenticationTimeoutSec * time.Second,
+							RedirectURLHostname:   "localhost",
 						},
 					},
 				},
@@ -212,6 +234,12 @@ func TestCmd_Run(t *testing.T) {
 					"--listen-address", "127.0.0.1:10080",
 					"--listen-address", "127.0.0.1:20080",
 					"--skip-open-browser",
+					"--authentication-timeout-sec", "10",
+					"--local-server-cert", "/path/to/local-server-cert",
+					"--local-server-key", "/path/to/local-server-key",
+					"--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",
 				},
@@ -225,9 +253,15 @@ func TestCmd_Run(t *testing.T) {
 					CACertData:     "BASE64ENCODED",
 					SkipTLSVerify:  true,
 					GrantOptionSet: authentication.GrantOptionSet{
-						AuthCodeOption: &authentication.AuthCodeOption{
-							BindAddress:     []string{"127.0.0.1:10080", "127.0.0.1:20080"},
-							SkipOpenBrowser: true,
+						AuthCodeBrowserOption: &authcode.BrowserOption{
+							BindAddress:                []string{"127.0.0.1:10080", "127.0.0.1:20080"},
+							SkipOpenBrowser:            true,
+							AuthenticationTimeout:      10 * time.Second,
+							LocalServerCertFile:        "/path/to/local-server-cert",
+							LocalServerKeyFile:         "/path/to/local-server-key",
+							OpenURLAfterAuthentication: "https://example.com/success.html",
+							RedirectURLHostname:        "localhost",
+							AuthRequestExtraParams:     map[string]string{"ttl": "86400", "reauth": "true"},
 						},
 					},
 				},
@@ -238,13 +272,16 @@ func TestCmd_Run(t *testing.T) {
 					"--oidc-issuer-url", "https://issuer.example.com",
 					"--oidc-client-id", "YOUR_CLIENT_ID",
 					"--grant-type", "authcode-keyboard",
+					"--oidc-auth-request-extra-params", "ttl=86400",
 				},
 				in: credentialplugin.Input{
 					TokenCacheDir: defaultTokenCacheDir,
 					IssuerURL:     "https://issuer.example.com",
 					ClientID:      "YOUR_CLIENT_ID",
 					GrantOptionSet: authentication.GrantOptionSet{
-						AuthCodeKeyboardOption: &authentication.AuthCodeKeyboardOption{},
+						AuthCodeKeyboardOption: &authcode.KeyboardOption{
+							AuthRequestExtraParams: map[string]string{"ttl": "86400"},
+						},
 					},
 				},
 			},
@@ -264,7 +301,7 @@ func TestCmd_Run(t *testing.T) {
 					IssuerURL:     "https://issuer.example.com",
 					ClientID:      "YOUR_CLIENT_ID",
 					GrantOptionSet: authentication.GrantOptionSet{
-						ROPCOption: &authentication.ROPCOption{
+						ROPCOption: &ropc.Option{
 							Username: "USER",
 							Password: "PASS",
 						},
@@ -286,7 +323,7 @@ func TestCmd_Run(t *testing.T) {
 					IssuerURL:     "https://issuer.example.com",
 					ClientID:      "YOUR_CLIENT_ID",
 					GrantOptionSet: authentication.GrantOptionSet{
-						ROPCOption: &authentication.ROPCOption{
+						ROPCOption: &ropc.Option{
 							Username: "USER",
 							Password: "PASS",
 						},

pkg/adaptors/cmd/get_token.go

@@ -14,24 +14,19 @@ type getTokenOptions struct {
 	ClientID              string
 	ClientSecret          string
 	ExtraScopes           []string
-	CACertFilename        string
-	CACertData            string
-	SkipTLSVerify         bool
 	TokenCacheDir         string
+	tlsOptions            tlsOptions
 	authenticationOptions authenticationOptions
 }
 
-func (o *getTokenOptions) register(f *pflag.FlagSet) {
-	f.SortFlags = false
+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.CACertFilename, "certificate-authority", "", "Path to a cert file for the certificate authority")
-	f.StringVar(&o.CACertData, "certificate-authority-data", "", "Base64 encoded data for the certificate authority")
-	f.BoolVar(&o.SkipTLSVerify, "insecure-skip-tls-verify", false, "If true, the server's certificate will not be checked for validity. This will make your HTTPS connections insecure")
-	f.StringVar(&o.TokenCacheDir, "token-cache-dir", defaultTokenCacheDir, "Path to a directory for caching tokens")
-	o.authenticationOptions.register(f)
+	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 {
@@ -66,9 +61,9 @@ func (cmd *GetToken) New() *cobra.Command {
 				ClientID:       o.ClientID,
 				ClientSecret:   o.ClientSecret,
 				ExtraScopes:    o.ExtraScopes,
-				CACertFilename: o.CACertFilename,
-				CACertData:     o.CACertData,
-				SkipTLSVerify:  o.SkipTLSVerify,
+				CACertFilename: o.tlsOptions.CACertFilename,
+				CACertData:     o.tlsOptions.CACertData,
+				SkipTLSVerify:  o.tlsOptions.SkipTLSVerify,
 				TokenCacheDir:  o.TokenCacheDir,
 				GrantOptionSet: grantOptionSet,
 			}
@@ -78,6 +73,7 @@ func (cmd *GetToken) New() *cobra.Command {
 			return nil
 		},
 	}
-	o.register(c.Flags())
+	c.Flags().SortFlags = false
+	o.addFlags(c.Flags())
 	return c
 }

pkg/adaptors/cmd/root.go

@@ -1,22 +1,18 @@
 package cmd
 
 import (
-	"fmt"
-	"strings"
-
 	"github.com/int128/kubelogin/pkg/adaptors/kubeconfig"
 	"github.com/int128/kubelogin/pkg/adaptors/logger"
-	"github.com/int128/kubelogin/pkg/usecases/authentication"
 	"github.com/int128/kubelogin/pkg/usecases/standalone"
 	"github.com/spf13/cobra"
 	"github.com/spf13/pflag"
 	"golang.org/x/xerrors"
 )
 
-const longDescription = `Login to the OpenID Connect provider.
+const rootDescription = `Log in to the OpenID Connect provider.
 
 You need to set up the OIDC provider, role binding, Kubernetes API server and kubeconfig.
-Run the following command to show the setup instruction:
+To show the setup instruction:
 
 	kubectl oidc-login setup
 
@@ -28,80 +24,16 @@ type rootOptions struct {
 	Kubeconfig            string
 	Context               string
 	User                  string
-	CertificateAuthority  string
-	SkipTLSVerify         bool
+	tlsOptions            tlsOptions
 	authenticationOptions authenticationOptions
 }
 
-func (o *rootOptions) register(f *pflag.FlagSet) {
-	f.SortFlags = false
+func (o *rootOptions) addFlags(f *pflag.FlagSet) {
 	f.StringVar(&o.Kubeconfig, "kubeconfig", "", "Path to the kubeconfig file")
-	f.StringVar(&o.Context, "context", "", "The name of the kubeconfig context to use")
-	f.StringVar(&o.User, "user", "", "The name of the kubeconfig user to use. Prior to --context")
-	f.StringVar(&o.CertificateAuthority, "certificate-authority", "", "Path to a cert file for the certificate authority")
-	f.BoolVar(&o.SkipTLSVerify, "insecure-skip-tls-verify", false, "If true, the server's certificate will not be checked for validity. This will make your HTTPS connections insecure")
-	o.authenticationOptions.register(f)
-}
-
-type authenticationOptions struct {
-	GrantType       string
-	ListenAddress   []string
-	ListenPort      []int // deprecated
-	SkipOpenBrowser bool
-	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) register(f *pflag.FlagSet) {
-	f.StringVar(&o.GrantType, "grant-type", "auto", fmt.Sprintf("The authorization grant type to use. One of (%s)", allGrantType))
-	f.StringSliceVar(&o.ListenAddress, "listen-address", defaultListenAddress, "Address to bind to the local server. If multiple addresses are given, it will try binding in order")
-	//TODO: remove the deprecated flag
-	f.IntSliceVar(&o.ListenPort, "listen-port", nil, "(Deprecated: use --listen-address)")
-	f.BoolVar(&o.SkipOpenBrowser, "skip-open-browser", false, "If true, it does not open the browser on authentication")
-	f.StringVar(&o.Username, "username", "", "If set, perform the resource owner password credentials grant")
-	f.StringVar(&o.Password, "password", "", "If set, use the password instead of asking it")
-}
-
-func (o *authenticationOptions) grantOptionSet() (s authentication.GrantOptionSet, err error) {
-	switch {
-	case o.GrantType == "authcode" || (o.GrantType == "auto" && o.Username == ""):
-		s.AuthCodeOption = &authentication.AuthCodeOption{
-			BindAddress:     o.determineListenAddress(),
-			SkipOpenBrowser: o.SkipOpenBrowser,
-		}
-	case o.GrantType == "authcode-keyboard":
-		s.AuthCodeKeyboardOption = &authentication.AuthCodeKeyboardOption{}
-	case o.GrantType == "password" || (o.GrantType == "auto" && o.Username != ""):
-		s.ROPCOption = &authentication.ROPCOption{
-			Username: o.Username,
-			Password: o.Password,
-		}
-	default:
-		err = xerrors.Errorf("grant-type must be one of (%s)", allGrantType)
-	}
-	return
+	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 {
@@ -111,10 +43,10 @@ type Root struct {
 
 func (cmd *Root) New() *cobra.Command {
 	var o rootOptions
-	rootCmd := &cobra.Command{
+	c := &cobra.Command{
 		Use:   "kubelogin",
-		Short: "Login to the OpenID Connect provider",
-		Long:  longDescription,
+		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()
@@ -125,8 +57,9 @@ func (cmd *Root) New() *cobra.Command {
 				KubeconfigFilename: o.Kubeconfig,
 				KubeconfigContext:  kubeconfig.ContextName(o.Context),
 				KubeconfigUser:     kubeconfig.UserName(o.User),
-				CACertFilename:     o.CertificateAuthority,
-				SkipTLSVerify:      o.SkipTLSVerify,
+				CACertFilename:     o.tlsOptions.CACertFilename,
+				CACertData:         o.tlsOptions.CACertData,
+				SkipTLSVerify:      o.tlsOptions.SkipTLSVerify,
 				GrantOptionSet:     grantOptionSet,
 			}
 			if err := cmd.Standalone.Do(c.Context(), in); err != nil {
@@ -135,7 +68,8 @@ func (cmd *Root) New() *cobra.Command {
 			return nil
 		},
 	}
-	o.register(rootCmd.Flags())
-	cmd.Logger.AddFlags(rootCmd.PersistentFlags())
-	return rootCmd
+	c.Flags().SortFlags = false
+	o.addFlags(c.Flags())
+	cmd.Logger.AddFlags(c.PersistentFlags())
+	return c
 }

pkg/adaptors/cmd/setup.go

@@ -13,22 +13,17 @@ type setupOptions struct {
 	ClientID              string
 	ClientSecret          string
 	ExtraScopes           []string
-	CACertFilename        string
-	CACertData            string
-	SkipTLSVerify         bool
+	tlsOptions            tlsOptions
 	authenticationOptions authenticationOptions
 }
 
-func (o *setupOptions) register(f *pflag.FlagSet) {
-	f.SortFlags = false
+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")
-	f.StringVar(&o.CACertFilename, "certificate-authority", "", "Path to a cert file for the certificate authority")
-	f.StringVar(&o.CACertData, "certificate-authority-data", "", "Base64 encoded data for the certificate authority")
-	f.BoolVar(&o.SkipTLSVerify, "insecure-skip-tls-verify", false, "If true, the server's certificate will not be checked for validity. This will make your HTTPS connections insecure")
-	o.authenticationOptions.register(f)
+	o.tlsOptions.addFlags(f)
+	o.authenticationOptions.addFlags(f)
 }
 
 type Setup struct {
@@ -51,9 +46,9 @@ func (cmd *Setup) New() *cobra.Command {
 				ClientID:       o.ClientID,
 				ClientSecret:   o.ClientSecret,
 				ExtraScopes:    o.ExtraScopes,
-				CACertFilename: o.CACertFilename,
-				CACertData:     o.CACertData,
-				SkipTLSVerify:  o.SkipTLSVerify,
+				CACertFilename: o.tlsOptions.CACertFilename,
+				CACertData:     o.tlsOptions.CACertData,
+				SkipTLSVerify:  o.tlsOptions.SkipTLSVerify,
 				GrantOptionSet: grantOptionSet,
 			}
 			if c.Flags().Lookup("listen-address").Changed {
@@ -69,6 +64,7 @@ func (cmd *Setup) New() *cobra.Command {
 			return nil
 		},
 	}
-	o.register(c.Flags())
+	c.Flags().SortFlags = false
+	o.addFlags(c.Flags())
 	return c
 }

pkg/adaptors/cmd/tls.go

@@ -0,0 +1,15 @@
+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")
+}

pkg/adaptors/credentialpluginwriter/credential_plugin.go

@@ -3,13 +3,13 @@ package credentialpluginwriter
 
 import (
 	"encoding/json"
-	"os"
 	"time"
 
 	"github.com/google/wire"
+	"github.com/int128/kubelogin/pkg/adaptors/stdio"
 	"golang.org/x/xerrors"
-	"k8s.io/apimachinery/pkg/apis/meta/v1"
-	"k8s.io/client-go/pkg/apis/clientauthentication/v1beta1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	clientauthenticationv1beta1 "k8s.io/client-go/pkg/apis/clientauthentication/v1beta1"
 )
 
 //go:generate mockgen -destination mock_credentialpluginwriter/mock_credentialpluginwriter.go github.com/int128/kubelogin/pkg/adaptors/credentialpluginwriter Interface
@@ -29,21 +29,23 @@ type Output struct {
 	Expiry time.Time
 }
 
-type Writer struct{}
+type Writer struct {
+	Stdout stdio.Stdout
+}
 
 // Write writes the ExecCredential to standard output for kubectl.
-func (*Writer) Write(out Output) error {
-	ec := &v1beta1.ExecCredential{
-		TypeMeta: v1.TypeMeta{
+func (w *Writer) Write(out Output) error {
+	ec := &clientauthenticationv1beta1.ExecCredential{
+		TypeMeta: metav1.TypeMeta{
 			APIVersion: "client.authentication.k8s.io/v1beta1",
 			Kind:       "ExecCredential",
 		},
-		Status: &v1beta1.ExecCredentialStatus{
+		Status: &clientauthenticationv1beta1.ExecCredentialStatus{
 			Token:               out.Token,
-			ExpirationTimestamp: &v1.Time{Time: out.Expiry},
+			ExpirationTimestamp: &metav1.Time{Time: out.Expiry},
 		},
 	}
-	e := json.NewEncoder(os.Stdout)
+	e := json.NewEncoder(w.Stdout)
 	if err := e.Encode(ec); err != nil {
 		return xerrors.Errorf("could not write the ExecCredential: %w", err)
 	}

pkg/adaptors/credentialpluginwriter/mock_credentialpluginwriter/mock_credentialpluginwriter.go

@@ -10,30 +10,30 @@ import (
 	reflect "reflect"
 )
 
-// MockInterface is a mock of Interface interface
+// MockInterface is a mock of Interface interface.
 type MockInterface struct {
 	ctrl     *gomock.Controller
 	recorder *MockInterfaceMockRecorder
 }
 
-// MockInterfaceMockRecorder is the mock recorder for MockInterface
+// MockInterfaceMockRecorder is the mock recorder for MockInterface.
 type MockInterfaceMockRecorder struct {
 	mock *MockInterface
 }
 
-// NewMockInterface creates a new mock instance
+// NewMockInterface creates a new mock instance.
 func NewMockInterface(ctrl *gomock.Controller) *MockInterface {
 	mock := &MockInterface{ctrl: ctrl}
 	mock.recorder = &MockInterfaceMockRecorder{mock}
 	return mock
 }
 
-// EXPECT returns an object that allows the caller to indicate expected use
+// EXPECT returns an object that allows the caller to indicate expected use.
 func (m *MockInterface) EXPECT() *MockInterfaceMockRecorder {
 	return m.recorder
 }
 
-// Write mocks base method
+// Write mocks base method.
 func (m *MockInterface) Write(arg0 credentialpluginwriter.Output) error {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "Write", arg0)
@@ -41,7 +41,7 @@ func (m *MockInterface) Write(arg0 credentialpluginwriter.Output) error {
 	return ret0
 }
 
-// Write indicates an expected call of Write
+// 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)

pkg/adaptors/kubeconfig/mock_kubeconfig/mock_kubeconfig.go

@@ -10,30 +10,30 @@ import (
 	reflect "reflect"
 )
 
-// MockInterface is a mock of Interface interface
+// MockInterface is a mock of Interface interface.
 type MockInterface struct {
 	ctrl     *gomock.Controller
 	recorder *MockInterfaceMockRecorder
 }
 
-// MockInterfaceMockRecorder is the mock recorder for MockInterface
+// MockInterfaceMockRecorder is the mock recorder for MockInterface.
 type MockInterfaceMockRecorder struct {
 	mock *MockInterface
 }
 
-// NewMockInterface creates a new mock instance
+// NewMockInterface creates a new mock instance.
 func NewMockInterface(ctrl *gomock.Controller) *MockInterface {
 	mock := &MockInterface{ctrl: ctrl}
 	mock.recorder = &MockInterfaceMockRecorder{mock}
 	return mock
 }
 
-// EXPECT returns an object that allows the caller to indicate expected use
+// EXPECT returns an object that allows the caller to indicate expected use.
 func (m *MockInterface) EXPECT() *MockInterfaceMockRecorder {
 	return m.recorder
 }
 
-// GetCurrentAuthProvider mocks base method
+// GetCurrentAuthProvider mocks base method.
 func (m *MockInterface) GetCurrentAuthProvider(arg0 string, arg1 kubeconfig.ContextName, arg2 kubeconfig.UserName) (*kubeconfig.AuthProvider, error) {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "GetCurrentAuthProvider", arg0, arg1, arg2)
@@ -42,13 +42,13 @@ func (m *MockInterface) GetCurrentAuthProvider(arg0 string, arg1 kubeconfig.Cont
 	return ret0, ret1
 }
 
-// GetCurrentAuthProvider indicates an expected call of GetCurrentAuthProvider
+// GetCurrentAuthProvider indicates an expected call of GetCurrentAuthProvider.
 func (mr *MockInterfaceMockRecorder) GetCurrentAuthProvider(arg0, arg1, arg2 interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "GetCurrentAuthProvider", reflect.TypeOf((*MockInterface)(nil).GetCurrentAuthProvider), arg0, arg1, arg2)
 }
 
-// UpdateAuthProvider mocks base method
+// UpdateAuthProvider mocks base method.
 func (m *MockInterface) UpdateAuthProvider(arg0 *kubeconfig.AuthProvider) error {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "UpdateAuthProvider", arg0)
@@ -56,7 +56,7 @@ func (m *MockInterface) UpdateAuthProvider(arg0 *kubeconfig.AuthProvider) error
 	return ret0
 }
 
-// UpdateAuthProvider indicates an expected call of UpdateAuthProvider
+// UpdateAuthProvider indicates an expected call of UpdateAuthProvider.
 func (mr *MockInterfaceMockRecorder) UpdateAuthProvider(arg0 interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "UpdateAuthProvider", reflect.TypeOf((*MockInterface)(nil).UpdateAuthProvider), arg0)

pkg/adaptors/oidcclient/factory.go

@@ -4,17 +4,27 @@ package oidcclient
 import (
 	"context"
 	"crypto/tls"
+	"fmt"
 	"net/http"
 
 	"github.com/coreos/go-oidc"
+	"github.com/google/wire"
 	"github.com/int128/kubelogin/pkg/adaptors/certpool"
+	"github.com/int128/kubelogin/pkg/adaptors/clock"
 	"github.com/int128/kubelogin/pkg/adaptors/logger"
 	"github.com/int128/kubelogin/pkg/adaptors/oidcclient/logging"
 	"golang.org/x/oauth2"
 	"golang.org/x/xerrors"
 )
 
-type NewFunc func(ctx context.Context, config Config) (Interface, error)
+var Set = wire.NewSet(
+	wire.Struct(new(Factory), "*"),
+	wire.Bind(new(FactoryInterface), new(*Factory)),
+)
+
+type FactoryInterface interface {
+	New(ctx context.Context, config Config) (Interface, error)
+}
 
 // Config represents a configuration of OpenID Connect client.
 type Config struct {
@@ -24,11 +34,15 @@ type Config struct {
 	ExtraScopes   []string // optional
 	CertPool      certpool.Interface
 	SkipTLSVerify bool
-	Logger        logger.Interface
+}
+
+type Factory struct {
+	Clock  clock.Interface
+	Logger logger.Interface
 }
 
 // New returns an instance of adaptors.Interface with the given configuration.
-func New(ctx context.Context, config Config) (Interface, error) {
+func (f *Factory) New(ctx context.Context, config Config) (Interface, error) {
 	var tlsConfig tls.Config
 	tlsConfig.InsecureSkipVerify = config.SkipTLSVerify
 	config.CertPool.SetRootCAs(&tlsConfig)
@@ -38,7 +52,7 @@ func New(ctx context.Context, config Config) (Interface, error) {
 	}
 	loggingTransport := &logging.Transport{
 		Base:   baseTransport,
-		Logger: config.Logger,
+		Logger: f.Logger,
 	}
 	httpClient := &http.Client{
 		Transport: loggingTransport,
@@ -49,6 +63,10 @@ func New(ctx context.Context, config Config) (Interface, error) {
 	if err != nil {
 		return nil, xerrors.Errorf("oidc discovery error: %w", err)
 	}
+	supportedPKCEMethods, err := extractSupportedPKCEMethods(provider)
+	if err != nil {
+		return nil, xerrors.Errorf("could not determine supported PKCE methods: %w", err)
+	}
 	return &client{
 		httpClient: httpClient,
 		provider:   provider,
@@ -58,6 +76,18 @@ func New(ctx context.Context, config Config) (Interface, error) {
 			ClientSecret: config.ClientSecret,
 			Scopes:       append(config.ExtraScopes, oidc.ScopeOpenID),
 		},
-		logger: config.Logger,
+		clock:                f.Clock,
+		logger:               f.Logger,
+		supportedPKCEMethods: supportedPKCEMethods,
 	}, nil
 }
+
+func extractSupportedPKCEMethods(provider *oidc.Provider) ([]string, error) {
+	var d struct {
+		CodeChallengeMethodsSupported []string `json:"code_challenge_methods_supported"`
+	}
+	if err := provider.Claims(&d); err != nil {
+		return nil, fmt.Errorf("invalid discovery document: %w", err)
+	}
+	return d.CodeChallengeMethodsSupported, nil
+}

pkg/adaptors/oidcclient/mock_oidcclient/mock_oidcclient.go

@@ -8,48 +8,49 @@ import (
 	context "context"
 	gomock "github.com/golang/mock/gomock"
 	oidcclient "github.com/int128/kubelogin/pkg/adaptors/oidcclient"
+	oidc "github.com/int128/kubelogin/pkg/oidc"
 	reflect "reflect"
 )
 
-// MockInterface is a mock of Interface interface
+// MockInterface is a mock of Interface interface.
 type MockInterface struct {
 	ctrl     *gomock.Controller
 	recorder *MockInterfaceMockRecorder
 }
 
-// MockInterfaceMockRecorder is the mock recorder for MockInterface
+// MockInterfaceMockRecorder is the mock recorder for MockInterface.
 type MockInterfaceMockRecorder struct {
 	mock *MockInterface
 }
 
-// NewMockInterface creates a new mock instance
+// NewMockInterface creates a new mock instance.
 func NewMockInterface(ctrl *gomock.Controller) *MockInterface {
 	mock := &MockInterface{ctrl: ctrl}
 	mock.recorder = &MockInterfaceMockRecorder{mock}
 	return mock
 }
 
-// EXPECT returns an object that allows the caller to indicate expected use
+// EXPECT returns an object that allows the caller to indicate expected use.
 func (m *MockInterface) EXPECT() *MockInterfaceMockRecorder {
 	return m.recorder
 }
 
-// ExchangeAuthCode mocks base method
-func (m *MockInterface) ExchangeAuthCode(arg0 context.Context, arg1 oidcclient.ExchangeAuthCodeInput) (*oidcclient.TokenSet, error) {
+// ExchangeAuthCode mocks base method.
+func (m *MockInterface) ExchangeAuthCode(arg0 context.Context, arg1 oidcclient.ExchangeAuthCodeInput) (*oidc.TokenSet, error) {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "ExchangeAuthCode", arg0, arg1)
-	ret0, _ := ret[0].(*oidcclient.TokenSet)
+	ret0, _ := ret[0].(*oidc.TokenSet)
 	ret1, _ := ret[1].(error)
 	return ret0, ret1
 }
 
-// ExchangeAuthCode indicates an expected call of ExchangeAuthCode
+// ExchangeAuthCode indicates an expected call of ExchangeAuthCode.
 func (mr *MockInterfaceMockRecorder) ExchangeAuthCode(arg0, arg1 interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "ExchangeAuthCode", reflect.TypeOf((*MockInterface)(nil).ExchangeAuthCode), arg0, arg1)
 }
 
-// GetAuthCodeURL mocks base method
+// GetAuthCodeURL mocks base method.
 func (m *MockInterface) GetAuthCodeURL(arg0 oidcclient.AuthCodeURLInput) string {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "GetAuthCodeURL", arg0)
@@ -57,53 +58,67 @@ func (m *MockInterface) GetAuthCodeURL(arg0 oidcclient.AuthCodeURLInput) string
 	return ret0
 }
 
-// GetAuthCodeURL indicates an expected call of GetAuthCodeURL
+// GetAuthCodeURL indicates an expected call of GetAuthCodeURL.
 func (mr *MockInterfaceMockRecorder) GetAuthCodeURL(arg0 interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "GetAuthCodeURL", reflect.TypeOf((*MockInterface)(nil).GetAuthCodeURL), arg0)
 }
 
-// GetTokenByAuthCode mocks base method
-func (m *MockInterface) GetTokenByAuthCode(arg0 context.Context, arg1 oidcclient.GetTokenByAuthCodeInput, arg2 chan<- string) (*oidcclient.TokenSet, error) {
+// GetTokenByAuthCode mocks base method.
+func (m *MockInterface) GetTokenByAuthCode(arg0 context.Context, arg1 oidcclient.GetTokenByAuthCodeInput, arg2 chan<- string) (*oidc.TokenSet, error) {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "GetTokenByAuthCode", arg0, arg1, arg2)
-	ret0, _ := ret[0].(*oidcclient.TokenSet)
+	ret0, _ := ret[0].(*oidc.TokenSet)
 	ret1, _ := ret[1].(error)
 	return ret0, ret1
 }
 
-// GetTokenByAuthCode indicates an expected call of GetTokenByAuthCode
+// GetTokenByAuthCode indicates an expected call of GetTokenByAuthCode.
 func (mr *MockInterfaceMockRecorder) GetTokenByAuthCode(arg0, arg1, arg2 interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "GetTokenByAuthCode", reflect.TypeOf((*MockInterface)(nil).GetTokenByAuthCode), arg0, arg1, arg2)
 }
 
-// GetTokenByROPC mocks base method
-func (m *MockInterface) GetTokenByROPC(arg0 context.Context, arg1, arg2 string) (*oidcclient.TokenSet, error) {
+// GetTokenByROPC mocks base method.
+func (m *MockInterface) GetTokenByROPC(arg0 context.Context, arg1, arg2 string) (*oidc.TokenSet, error) {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "GetTokenByROPC", arg0, arg1, arg2)
-	ret0, _ := ret[0].(*oidcclient.TokenSet)
+	ret0, _ := ret[0].(*oidc.TokenSet)
 	ret1, _ := ret[1].(error)
 	return ret0, ret1
 }
 
-// GetTokenByROPC indicates an expected call of GetTokenByROPC
+// GetTokenByROPC indicates an expected call of GetTokenByROPC.
 func (mr *MockInterfaceMockRecorder) GetTokenByROPC(arg0, arg1, arg2 interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "GetTokenByROPC", reflect.TypeOf((*MockInterface)(nil).GetTokenByROPC), arg0, arg1, arg2)
 }
 
-// Refresh mocks base method
-func (m *MockInterface) Refresh(arg0 context.Context, arg1 string) (*oidcclient.TokenSet, error) {
+// Refresh mocks base method.
+func (m *MockInterface) Refresh(arg0 context.Context, arg1 string) (*oidc.TokenSet, error) {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "Refresh", arg0, arg1)
-	ret0, _ := ret[0].(*oidcclient.TokenSet)
+	ret0, _ := ret[0].(*oidc.TokenSet)
 	ret1, _ := ret[1].(error)
 	return ret0, ret1
 }
 
-// Refresh indicates an expected call of Refresh
+// Refresh indicates an expected call of Refresh.
 func (mr *MockInterfaceMockRecorder) Refresh(arg0, arg1 interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Refresh", reflect.TypeOf((*MockInterface)(nil).Refresh), arg0, arg1)
 }
+
+// SupportedPKCEMethods mocks base method.
+func (m *MockInterface) SupportedPKCEMethods() []string {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "SupportedPKCEMethods")
+	ret0, _ := ret[0].([]string)
+	return ret0
+}
+
+// SupportedPKCEMethods indicates an expected call of SupportedPKCEMethods.
+func (mr *MockInterfaceMockRecorder) SupportedPKCEMethods() *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "SupportedPKCEMethods", reflect.TypeOf((*MockInterface)(nil).SupportedPKCEMethods))
+}

pkg/adaptors/oidcclient/oidcclient.go

@@ -5,10 +5,12 @@ import (
 	"net/http"
 	"time"
 
-	"github.com/coreos/go-oidc"
-	"github.com/google/wire"
+	gooidc "github.com/coreos/go-oidc"
+	"github.com/int128/kubelogin/pkg/adaptors/clock"
 	"github.com/int128/kubelogin/pkg/adaptors/logger"
-	"github.com/int128/kubelogin/pkg/domain/jwt"
+	"github.com/int128/kubelogin/pkg/jwt"
+	"github.com/int128/kubelogin/pkg/oidc"
+	"github.com/int128/kubelogin/pkg/pkce"
 	"github.com/int128/oauth2cli"
 	"golang.org/x/oauth2"
 	"golang.org/x/xerrors"
@@ -16,55 +18,49 @@ import (
 
 //go:generate mockgen -destination mock_oidcclient/mock_oidcclient.go github.com/int128/kubelogin/pkg/adaptors/oidcclient Interface
 
-var Set = wire.NewSet(
-	wire.Value(NewFunc(New)),
-)
-
 type Interface interface {
 	GetAuthCodeURL(in AuthCodeURLInput) string
-	ExchangeAuthCode(ctx context.Context, in ExchangeAuthCodeInput) (*TokenSet, error)
-	GetTokenByAuthCode(ctx context.Context, in GetTokenByAuthCodeInput, localServerReadyChan chan<- string) (*TokenSet, error)
-	GetTokenByROPC(ctx context.Context, username, password string) (*TokenSet, error)
-	Refresh(ctx context.Context, refreshToken string) (*TokenSet, error)
+	ExchangeAuthCode(ctx context.Context, in ExchangeAuthCodeInput) (*oidc.TokenSet, error)
+	GetTokenByAuthCode(ctx context.Context, in GetTokenByAuthCodeInput, localServerReadyChan chan<- string) (*oidc.TokenSet, error)
+	GetTokenByROPC(ctx context.Context, username, password string) (*oidc.TokenSet, error)
+	Refresh(ctx context.Context, refreshToken string) (*oidc.TokenSet, error)
+	SupportedPKCEMethods() []string
 }
 
 type AuthCodeURLInput struct {
-	State               string
-	Nonce               string
-	CodeChallenge       string
-	CodeChallengeMethod string
-	RedirectURI         string
+	State                  string
+	Nonce                  string
+	PKCEParams             pkce.Params
+	RedirectURI            string
+	AuthRequestExtraParams map[string]string
 }
 
 type ExchangeAuthCodeInput struct {
-	Code         string
-	CodeVerifier string
-	Nonce        string
-	RedirectURI  string
+	Code        string
+	PKCEParams  pkce.Params
+	Nonce       string
+	RedirectURI string
 }
 
 type GetTokenByAuthCodeInput struct {
-	BindAddress         []string
-	State               string
-	Nonce               string
-	CodeChallenge       string
-	CodeChallengeMethod string
-	CodeVerifier        string
-}
-
-// TokenSet represents an output DTO of
-// Interface.GetTokenByAuthCode, Interface.GetTokenByROPC and Interface.Refresh.
-type TokenSet struct {
-	IDToken       string
-	RefreshToken  string
-	IDTokenClaims jwt.Claims
+	BindAddress            []string
+	State                  string
+	Nonce                  string
+	PKCEParams             pkce.Params
+	RedirectURLHostname    string
+	AuthRequestExtraParams map[string]string
+	LocalServerSuccessHTML string
+	LocalServerCertFile    string
+	LocalServerKeyFile     string
 }
 
 type client struct {
-	httpClient   *http.Client
-	provider     *oidc.Provider
-	oauth2Config oauth2.Config
-	logger       logger.Interface
+	httpClient           *http.Client
+	provider             *gooidc.Provider
+	oauth2Config         oauth2.Config
+	clock                clock.Interface
+	logger               logger.Interface
+	supportedPKCEMethods []string
 }
 
 func (c *client) wrapContext(ctx context.Context) context.Context {
@@ -75,22 +71,20 @@ func (c *client) wrapContext(ctx context.Context) context.Context {
 }
 
 // GetTokenByAuthCode performs the authorization code flow.
-func (c *client) GetTokenByAuthCode(ctx context.Context, in GetTokenByAuthCodeInput, localServerReadyChan chan<- string) (*TokenSet, error) {
+func (c *client) GetTokenByAuthCode(ctx context.Context, in GetTokenByAuthCodeInput, localServerReadyChan chan<- string) (*oidc.TokenSet, error) {
 	ctx = c.wrapContext(ctx)
 	config := oauth2cli.Config{
-		OAuth2Config: c.oauth2Config,
-		State:        in.State,
-		AuthCodeOptions: []oauth2.AuthCodeOption{
-			oauth2.AccessTypeOffline,
-			oidc.Nonce(in.Nonce),
-			oauth2.SetAuthURLParam("code_challenge", in.CodeChallenge),
-			oauth2.SetAuthURLParam("code_challenge_method", in.CodeChallengeMethod),
-		},
-		TokenRequestOptions: []oauth2.AuthCodeOption{
-			oauth2.SetAuthURLParam("code_verifier", in.CodeVerifier),
-		},
+		OAuth2Config:           c.oauth2Config,
+		State:                  in.State,
+		AuthCodeOptions:        authorizationRequestOptions(in.Nonce, in.PKCEParams, in.AuthRequestExtraParams),
+		TokenRequestOptions:    tokenRequestOptions(in.PKCEParams),
 		LocalServerBindAddress: in.BindAddress,
 		LocalServerReadyChan:   localServerReadyChan,
+		RedirectURLHostname:    in.RedirectURLHostname,
+		LocalServerSuccessHTML: in.LocalServerSuccessHTML,
+		LocalServerCertFile:    in.LocalServerCertFile,
+		LocalServerKeyFile:     in.LocalServerKeyFile,
+		Logf:                   c.logger.V(1).Infof,
 	}
 	token, err := oauth2cli.GetToken(ctx, config)
 	if err != nil {
@@ -103,28 +97,55 @@ func (c *client) GetTokenByAuthCode(ctx context.Context, in GetTokenByAuthCodeIn
 func (c *client) GetAuthCodeURL(in AuthCodeURLInput) string {
 	cfg := c.oauth2Config
 	cfg.RedirectURL = in.RedirectURI
-	return cfg.AuthCodeURL(in.State,
-		oauth2.AccessTypeOffline,
-		oidc.Nonce(in.Nonce),
-		oauth2.SetAuthURLParam("code_challenge", in.CodeChallenge),
-		oauth2.SetAuthURLParam("code_challenge_method", in.CodeChallengeMethod),
-	)
+	opts := authorizationRequestOptions(in.Nonce, in.PKCEParams, in.AuthRequestExtraParams)
+	return cfg.AuthCodeURL(in.State, opts...)
 }
 
 // ExchangeAuthCode exchanges the authorization code and token.
-func (c *client) ExchangeAuthCode(ctx context.Context, in ExchangeAuthCodeInput) (*TokenSet, error) {
+func (c *client) ExchangeAuthCode(ctx context.Context, in ExchangeAuthCodeInput) (*oidc.TokenSet, error) {
 	ctx = c.wrapContext(ctx)
 	cfg := c.oauth2Config
 	cfg.RedirectURL = in.RedirectURI
-	token, err := cfg.Exchange(ctx, in.Code, oauth2.SetAuthURLParam("code_verifier", in.CodeVerifier))
+	opts := tokenRequestOptions(in.PKCEParams)
+	token, err := cfg.Exchange(ctx, in.Code, opts...)
 	if err != nil {
 		return nil, xerrors.Errorf("exchange error: %w", err)
 	}
 	return c.verifyToken(ctx, token, in.Nonce)
 }
 
+func authorizationRequestOptions(n string, p pkce.Params, e map[string]string) []oauth2.AuthCodeOption {
+	o := []oauth2.AuthCodeOption{
+		oauth2.AccessTypeOffline,
+		gooidc.Nonce(n),
+	}
+	if !p.IsZero() {
+		o = append(o,
+			oauth2.SetAuthURLParam("code_challenge", p.CodeChallenge),
+			oauth2.SetAuthURLParam("code_challenge_method", p.CodeChallengeMethod),
+		)
+	}
+	for key, value := range e {
+		o = append(o, oauth2.SetAuthURLParam(key, value))
+	}
+	return o
+}
+
+func tokenRequestOptions(p pkce.Params) (o []oauth2.AuthCodeOption) {
+	if !p.IsZero() {
+		o = append(o, oauth2.SetAuthURLParam("code_verifier", p.CodeVerifier))
+	}
+	return
+}
+
+// SupportedPKCEMethods returns the PKCE methods supported by the provider.
+// This may return nil if PKCE is not supported.
+func (c *client) SupportedPKCEMethods() []string {
+	return c.supportedPKCEMethods
+}
+
 // GetTokenByROPC performs the resource owner password credentials flow.
-func (c *client) GetTokenByROPC(ctx context.Context, username, password string) (*TokenSet, error) {
+func (c *client) GetTokenByROPC(ctx context.Context, username, password string) (*oidc.TokenSet, error) {
 	ctx = c.wrapContext(ctx)
 	token, err := c.oauth2Config.PasswordCredentialsToken(ctx, username, password)
 	if err != nil {
@@ -134,7 +155,7 @@ func (c *client) GetTokenByROPC(ctx context.Context, username, password string)
 }
 
 // Refresh sends a refresh token request and returns a token set.
-func (c *client) Refresh(ctx context.Context, refreshToken string) (*TokenSet, error) {
+func (c *client) Refresh(ctx context.Context, refreshToken string) (*oidc.TokenSet, error) {
 	ctx = c.wrapContext(ctx)
 	currentToken := &oauth2.Token{
 		Expiry:       time.Now(),
@@ -150,12 +171,12 @@ func (c *client) Refresh(ctx context.Context, refreshToken string) (*TokenSet, e
 
 // verifyToken verifies the token with the certificates of the provider and the nonce.
 // If the nonce is an empty string, it does not verify the nonce.
-func (c *client) verifyToken(ctx context.Context, token *oauth2.Token, nonce string) (*TokenSet, error) {
+func (c *client) verifyToken(ctx context.Context, token *oauth2.Token, nonce string) (*oidc.TokenSet, error) {
 	idToken, ok := token.Extra("id_token").(string)
 	if !ok {
 		return nil, xerrors.Errorf("id_token is missing in the token response: %s", token)
 	}
-	verifier := c.provider.Verifier(&oidc.Config{ClientID: c.oauth2Config.ClientID})
+	verifier := c.provider.Verifier(&gooidc.Config{ClientID: c.oauth2Config.ClientID, Now: c.clock.Now})
 	verifiedIDToken, err := verifier.Verify(ctx, idToken)
 	if err != nil {
 		return nil, xerrors.Errorf("could not verify the ID token: %w", err)
@@ -167,7 +188,7 @@ func (c *client) verifyToken(ctx context.Context, token *oauth2.Token, nonce str
 	if err != nil {
 		return nil, xerrors.Errorf("could not decode the token: %w", err)
 	}
-	return &TokenSet{
+	return &oidc.TokenSet{
 		IDToken: idToken,
 		IDTokenClaims: jwt.Claims{
 			Subject: verifiedIDToken.Subject,

pkg/adaptors/reader/mock_reader/mock_reader.go

@@ -9,30 +9,30 @@ import (
 	reflect "reflect"
 )
 
-// MockInterface is a mock of Interface interface
+// MockInterface is a mock of Interface interface.
 type MockInterface struct {
 	ctrl     *gomock.Controller
 	recorder *MockInterfaceMockRecorder
 }
 
-// MockInterfaceMockRecorder is the mock recorder for MockInterface
+// MockInterfaceMockRecorder is the mock recorder for MockInterface.
 type MockInterfaceMockRecorder struct {
 	mock *MockInterface
 }
 
-// NewMockInterface creates a new mock instance
+// NewMockInterface creates a new mock instance.
 func NewMockInterface(ctrl *gomock.Controller) *MockInterface {
 	mock := &MockInterface{ctrl: ctrl}
 	mock.recorder = &MockInterfaceMockRecorder{mock}
 	return mock
 }
 
-// EXPECT returns an object that allows the caller to indicate expected use
+// EXPECT returns an object that allows the caller to indicate expected use.
 func (m *MockInterface) EXPECT() *MockInterfaceMockRecorder {
 	return m.recorder
 }
 
-// ReadPassword mocks base method
+// ReadPassword mocks base method.
 func (m *MockInterface) ReadPassword(arg0 string) (string, error) {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "ReadPassword", arg0)
@@ -41,13 +41,13 @@ func (m *MockInterface) ReadPassword(arg0 string) (string, error) {
 	return ret0, ret1
 }
 
-// ReadPassword indicates an expected call of ReadPassword
+// ReadPassword indicates an expected call of ReadPassword.
 func (mr *MockInterfaceMockRecorder) ReadPassword(arg0 interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "ReadPassword", reflect.TypeOf((*MockInterface)(nil).ReadPassword), arg0)
 }
 
-// ReadString mocks base method
+// ReadString mocks base method.
 func (m *MockInterface) ReadString(arg0 string) (string, error) {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "ReadString", arg0)
@@ -56,7 +56,7 @@ func (m *MockInterface) ReadString(arg0 string) (string, error) {
 	return ret0, ret1
 }
 
-// ReadString indicates an expected call of ReadString
+// ReadString indicates an expected call of ReadString.
 func (mr *MockInterfaceMockRecorder) ReadString(arg0 interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "ReadString", reflect.TypeOf((*MockInterface)(nil).ReadString), arg0)

pkg/adaptors/reader/reader.go

@@ -9,6 +9,7 @@ import (
 	"syscall"
 
 	"github.com/google/wire"
+	"github.com/int128/kubelogin/pkg/adaptors/stdio"
 	"golang.org/x/crypto/ssh/terminal"
 	"golang.org/x/xerrors"
 )
@@ -26,14 +27,16 @@ type Interface interface {
 	ReadPassword(prompt string) (string, error)
 }
 
-type Reader struct{}
+type Reader struct {
+	Stdin stdio.Stdin
+}
 
 // ReadString reads a string from the stdin.
-func (*Reader) ReadString(prompt string) (string, error) {
+func (x *Reader) ReadString(prompt string) (string, error) {
 	if _, err := fmt.Fprint(os.Stderr, prompt); err != nil {
 		return "", xerrors.Errorf("write error: %w", err)
 	}
-	r := bufio.NewReader(os.Stdin)
+	r := bufio.NewReader(x.Stdin)
 	s, err := r.ReadString('\n')
 	if err != nil {
 		return "", xerrors.Errorf("read error: %w", err)

pkg/adaptors/stdio/stdio.go

@@ -0,0 +1,17 @@
+// Package stdio wraps os.Stdin and os.Stdout for testing.
+package stdio
+
+import (
+	"io"
+	"os"
+
+	"github.com/google/wire"
+)
+
+var Set = wire.NewSet(
+	wire.InterfaceValue(new(Stdin), os.Stdin),
+	wire.InterfaceValue(new(Stdout), os.Stdout),
+)
+
+type Stdout io.Writer
+type Stdin io.Reader

pkg/adaptors/tokencache/mock_tokencache/mock_tokencache.go

@@ -10,30 +10,30 @@ import (
 	reflect "reflect"
 )
 
-// MockInterface is a mock of Interface interface
+// MockInterface is a mock of Interface interface.
 type MockInterface struct {
 	ctrl     *gomock.Controller
 	recorder *MockInterfaceMockRecorder
 }
 
-// MockInterfaceMockRecorder is the mock recorder for MockInterface
+// MockInterfaceMockRecorder is the mock recorder for MockInterface.
 type MockInterfaceMockRecorder struct {
 	mock *MockInterface
 }
 
-// NewMockInterface creates a new mock instance
+// NewMockInterface creates a new mock instance.
 func NewMockInterface(ctrl *gomock.Controller) *MockInterface {
 	mock := &MockInterface{ctrl: ctrl}
 	mock.recorder = &MockInterfaceMockRecorder{mock}
 	return mock
 }
 
-// EXPECT returns an object that allows the caller to indicate expected use
+// EXPECT returns an object that allows the caller to indicate expected use.
 func (m *MockInterface) EXPECT() *MockInterfaceMockRecorder {
 	return m.recorder
 }
 
-// FindByKey mocks base method
+// FindByKey mocks base method.
 func (m *MockInterface) FindByKey(arg0 string, arg1 tokencache.Key) (*tokencache.Value, error) {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "FindByKey", arg0, arg1)
@@ -42,13 +42,13 @@ func (m *MockInterface) FindByKey(arg0 string, arg1 tokencache.Key) (*tokencache
 	return ret0, ret1
 }
 
-// FindByKey indicates an expected call of FindByKey
+// FindByKey indicates an expected call of FindByKey.
 func (mr *MockInterfaceMockRecorder) FindByKey(arg0, arg1 interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "FindByKey", reflect.TypeOf((*MockInterface)(nil).FindByKey), arg0, arg1)
 }
 
-// Save mocks base method
+// Save mocks base method.
 func (m *MockInterface) Save(arg0 string, arg1 tokencache.Key, arg2 tokencache.Value) error {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "Save", arg0, arg1, arg2)
@@ -56,7 +56,7 @@ func (m *MockInterface) Save(arg0 string, arg1 tokencache.Key, arg2 tokencache.V
 	return ret0
 }
 
-// Save indicates an expected call of Save
+// Save indicates an expected call of Save.
 func (mr *MockInterfaceMockRecorder) Save(arg0, arg1, arg2 interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Save", reflect.TypeOf((*MockInterface)(nil).Save), arg0, arg1, arg2)

pkg/adaptors/tokencache/tokencache_test.go

@@ -2,7 +2,6 @@ package tokencache
 
 import (
 	"io/ioutil"
-	"os"
 	"path/filepath"
 	"testing"
 
@@ -13,15 +12,7 @@ func TestRepository_FindByKey(t *testing.T) {
 	var r Repository
 
 	t.Run("Success", func(t *testing.T) {
-		dir, err := ioutil.TempDir("", "kube")
-		if err != nil {
-			t.Fatalf("could not create a temp dir: %s", err)
-		}
-		defer func() {
-			if err := os.RemoveAll(dir); err != nil {
-				t.Errorf("could not clean up the temp dir: %s", err)
-			}
-		}()
+		dir := t.TempDir()
 		key := Key{
 			IssuerURL:      "YOUR_ISSUER",
 			ClientID:       "YOUR_CLIENT_ID",
@@ -55,16 +46,7 @@ func TestRepository_Save(t *testing.T) {
 	var r Repository
 
 	t.Run("Success", func(t *testing.T) {
-		dir, err := ioutil.TempDir("", "kube")
-		if err != nil {
-			t.Fatalf("could not create a temp dir: %s", err)
-		}
-		defer func() {
-			if err := os.RemoveAll(dir); err != nil {
-				t.Errorf("could not clean up the temp dir: %s", err)
-			}
-		}()
-
+		dir := t.TempDir()
 		key := Key{
 			IssuerURL:      "YOUR_ISSUER",
 			ClientID:       "YOUR_CLIENT_ID",

pkg/di/di.go

@@ -14,6 +14,7 @@ import (
 	"github.com/int128/kubelogin/pkg/adaptors/logger"
 	"github.com/int128/kubelogin/pkg/adaptors/oidcclient"
 	"github.com/int128/kubelogin/pkg/adaptors/reader"
+	"github.com/int128/kubelogin/pkg/adaptors/stdio"
 	"github.com/int128/kubelogin/pkg/adaptors/tokencache"
 	"github.com/int128/kubelogin/pkg/usecases/authentication"
 	"github.com/int128/kubelogin/pkg/usecases/credentialplugin"
@@ -27,15 +28,16 @@ func NewCmd() cmd.Interface {
 		NewCmdForHeadless,
 
 		// dependencies for production
+		clock.Set,
+		stdio.Set,
 		logger.Set,
 		browser.Set,
-		credentialpluginwriter.Set,
 	)
 	return nil
 }
 
 // NewCmdForHeadless returns an instance of adaptors.Cmd for headless testing.
-func NewCmdForHeadless(logger.Interface, browser.Interface, credentialpluginwriter.Interface) cmd.Interface {
+func NewCmdForHeadless(clock.Interface, stdio.Stdin, stdio.Stdout, logger.Interface, browser.Interface) cmd.Interface {
 	wire.Build(
 		// use-cases
 		authentication.Set,
@@ -46,11 +48,11 @@ func NewCmdForHeadless(logger.Interface, browser.Interface, credentialpluginwrit
 		// adaptors
 		cmd.Set,
 		reader.Set,
-		clock.Set,
 		kubeconfig.Set,
 		tokencache.Set,
 		oidcclient.Set,
 		certpool.Set,
+		credentialpluginwriter.Set,
 	)
 	return nil
 }

pkg/di/wire_gen.go

@@ -15,55 +15,72 @@ import (
 	"github.com/int128/kubelogin/pkg/adaptors/logger"
 	"github.com/int128/kubelogin/pkg/adaptors/oidcclient"
 	"github.com/int128/kubelogin/pkg/adaptors/reader"
+	"github.com/int128/kubelogin/pkg/adaptors/stdio"
 	"github.com/int128/kubelogin/pkg/adaptors/tokencache"
 	"github.com/int128/kubelogin/pkg/usecases/authentication"
+	"github.com/int128/kubelogin/pkg/usecases/authentication/authcode"
+	"github.com/int128/kubelogin/pkg/usecases/authentication/ropc"
 	"github.com/int128/kubelogin/pkg/usecases/credentialplugin"
 	"github.com/int128/kubelogin/pkg/usecases/setup"
 	"github.com/int128/kubelogin/pkg/usecases/standalone"
+	"os"
 )
 
 // Injectors from di.go:
 
+// NewCmd returns an instance of adaptors.Cmd.
 func NewCmd() cmd.Interface {
+	clockReal := &clock.Real{}
+	stdin := _wireFileValue
+	stdout := _wireOsFileValue
 	loggerInterface := logger.New()
 	browserBrowser := &browser.Browser{}
-	writer := &credentialpluginwriter.Writer{}
-	cmdInterface := NewCmdForHeadless(loggerInterface, browserBrowser, writer)
+	cmdInterface := NewCmdForHeadless(clockReal, stdin, stdout, loggerInterface, browserBrowser)
 	return cmdInterface
 }
 
-func NewCmdForHeadless(loggerInterface logger.Interface, browserInterface browser.Interface, credentialpluginwriterInterface credentialpluginwriter.Interface) cmd.Interface {
-	newFunc := _wireNewFuncValue
-	clockClock := &clock.Clock{}
-	authCode := &authentication.AuthCode{
+var (
+	_wireFileValue   = os.Stdin
+	_wireOsFileValue = os.Stdout
+)
+
+// NewCmdForHeadless returns an instance of adaptors.Cmd for headless testing.
+func NewCmdForHeadless(clockInterface clock.Interface, stdin stdio.Stdin, stdout stdio.Stdout, loggerInterface logger.Interface, browserInterface browser.Interface) cmd.Interface {
+	factory := &oidcclient.Factory{
+		Clock:  clockInterface,
+		Logger: loggerInterface,
+	}
+	authcodeBrowser := &authcode.Browser{
 		Browser: browserInterface,
 		Logger:  loggerInterface,
 	}
-	readerReader := &reader.Reader{}
-	authCodeKeyboard := &authentication.AuthCodeKeyboard{
+	readerReader := &reader.Reader{
+		Stdin: stdin,
+	}
+	keyboard := &authcode.Keyboard{
 		Reader: readerReader,
 		Logger: loggerInterface,
 	}
-	ropc := &authentication.ROPC{
+	ropcROPC := &ropc.ROPC{
 		Reader: readerReader,
 		Logger: loggerInterface,
 	}
 	authenticationAuthentication := &authentication.Authentication{
-		NewOIDCClient:    newFunc,
+		OIDCClient:       factory,
 		Logger:           loggerInterface,
-		Clock:            clockClock,
-		AuthCode:         authCode,
-		AuthCodeKeyboard: authCodeKeyboard,
-		ROPC:             ropc,
+		Clock:            clockInterface,
+		AuthCodeBrowser:  authcodeBrowser,
+		AuthCodeKeyboard: keyboard,
+		ROPC:             ropcROPC,
 	}
 	kubeconfigKubeconfig := &kubeconfig.Kubeconfig{
 		Logger: loggerInterface,
 	}
-	certpoolNewFunc := _wireCertpoolNewFuncValue
+	newFunc := _wireNewFuncValue
 	standaloneStandalone := &standalone.Standalone{
 		Authentication: authenticationAuthentication,
 		Kubeconfig:     kubeconfigKubeconfig,
-		NewCertPool:    certpoolNewFunc,
+		NewCertPool:    newFunc,
 		Logger:         loggerInterface,
 	}
 	root := &cmd.Root{
@@ -71,11 +88,14 @@ func NewCmdForHeadless(loggerInterface logger.Interface, browserInterface browse
 		Logger:     loggerInterface,
 	}
 	repository := &tokencache.Repository{}
+	writer := &credentialpluginwriter.Writer{
+		Stdout: stdout,
+	}
 	getToken := &credentialplugin.GetToken{
 		Authentication:       authenticationAuthentication,
 		TokenCacheRepository: repository,
-		NewCertPool:          certpoolNewFunc,
-		Writer:               credentialpluginwriterInterface,
+		NewCertPool:          newFunc,
+		Writer:               writer,
 		Logger:               loggerInterface,
 	}
 	cmdGetToken := &cmd.GetToken{
@@ -84,7 +104,7 @@ func NewCmdForHeadless(loggerInterface logger.Interface, browserInterface browse
 	}
 	setupSetup := &setup.Setup{
 		Authentication: authenticationAuthentication,
-		NewCertPool:    certpoolNewFunc,
+		NewCertPool:    newFunc,
 		Logger:         loggerInterface,
 	}
 	cmdSetup := &cmd.Setup{
@@ -100,6 +120,5 @@ func NewCmdForHeadless(loggerInterface logger.Interface, browserInterface browse
 }
 
 var (
-	_wireNewFuncValue         = oidcclient.NewFunc(oidcclient.New)
-	_wireCertpoolNewFuncValue = certpool.NewFunc(certpool.New)
+	_wireNewFuncValue = certpool.NewFunc(certpool.New)
 )

pkg/domain/oidc/oidc_test.go

@@ -1,25 +0,0 @@
-package oidc
-
-import (
-	"testing"
-)
-
-func Test_computeS256(t *testing.T) {
-	// Testdata described at:
-	// https://tools.ietf.org/html/rfc7636#appendix-B
-	b := []byte{
-		116, 24, 223, 180, 151, 153, 224, 37, 79, 250, 96, 125, 216, 173,
-		187, 186, 22, 212, 37, 77, 105, 214, 191, 240, 91, 88, 5, 88, 83,
-		132, 141, 121,
-	}
-	p := computeS256(b)
-	if want := "dBjftJeZ4CVP-mB92K27uhbUJU1p1r_wW1gFWFOEjXk"; want != p.CodeVerifier {
-		t.Errorf("CodeVerifier wants %s but was %s", want, p.CodeVerifier)
-	}
-	if want := "E9Melhoa2OwvFrEMTJguCHaoeK1t8URWbuGJSstw-cM"; want != p.CodeChallenge {
-		t.Errorf("CodeChallenge wants %s but was %s", want, p.CodeChallenge)
-	}
-	if p.CodeChallengeMethod != "S256" {
-		t.Errorf("CodeChallengeMethod wants S256 but was %s", p.CodeChallengeMethod)
-	}
-}

pkg/jwt/token_test.go

@@ -4,7 +4,7 @@ import (
 	"testing"
 	"time"
 
-	"github.com/int128/kubelogin/pkg/domain/jwt"
+	"github.com/int128/kubelogin/pkg/jwt"
 )
 
 type timeProvider time.Time

pkg/oidc/oidc.go

@@ -2,13 +2,21 @@ package oidc
 
 import (
 	"crypto/rand"
-	"crypto/sha256"
 	"encoding/base64"
 	"encoding/binary"
 
+	"github.com/int128/kubelogin/pkg/jwt"
 	"golang.org/x/xerrors"
 )
 
+// TokenSet represents an output DTO of
+// Interface.GetTokenByAuthCode, Interface.GetTokenByROPC and Interface.Refresh.
+type TokenSet struct {
+	IDToken       string
+	RefreshToken  string
+	IDTokenClaims jwt.Claims
+}
+
 func NewState() (string, error) {
 	b, err := random32()
 	if err != nil {
@@ -25,21 +33,6 @@ func NewNonce() (string, error) {
 	return base64URLEncode(b), nil
 }
 
-type PKCEParams struct {
-	CodeChallenge       string
-	CodeChallengeMethod string
-	CodeVerifier        string
-}
-
-func NewPKCEParams() (*PKCEParams, error) {
-	b, err := random32()
-	if err != nil {
-		return nil, xerrors.Errorf("could not generate a random: %w", err)
-	}
-	s := computeS256(b)
-	return &s, nil
-}
-
 func random32() ([]byte, error) {
 	b := make([]byte, 32)
 	if err := binary.Read(rand.Reader, binary.LittleEndian, b); err != nil {
@@ -48,17 +41,6 @@ func random32() ([]byte, error) {
 	return b, nil
 }
 
-func computeS256(b []byte) PKCEParams {
-	v := base64URLEncode(b)
-	s := sha256.New()
-	_, _ = s.Write([]byte(v))
-	return PKCEParams{
-		CodeChallenge:       base64URLEncode(s.Sum(nil)),
-		CodeChallengeMethod: "S256",
-		CodeVerifier:        v,
-	}
-}
-
 func base64URLEncode(b []byte) string {
 	return base64.URLEncoding.WithPadding(base64.NoPadding).EncodeToString(b)
 }

pkg/pkce/pkce.go

@@ -0,0 +1,74 @@
+// Package pkce provides generation of the PKCE parameters.
+// See also https://tools.ietf.org/html/rfc7636.
+package pkce
+
+import (
+	"crypto/rand"
+	"crypto/sha256"
+	"encoding/base64"
+	"encoding/binary"
+
+	"golang.org/x/xerrors"
+)
+
+var Plain Params
+
+const (
+	// code challenge methods defined as https://tools.ietf.org/html/rfc7636#section-4.3
+	methodS256 = "S256"
+)
+
+// Params represents a set of the PKCE parameters.
+type Params struct {
+	CodeChallenge       string
+	CodeChallengeMethod string
+	CodeVerifier        string
+}
+
+func (p Params) IsZero() bool {
+	return p == Params{}
+}
+
+// New returns a parameters supported by the provider.
+// You need to pass the code challenge methods defined in RFC7636.
+// It returns Plain if no method is available.
+func New(methods []string) (Params, error) {
+	for _, method := range methods {
+		if method == methodS256 {
+			return NewS256()
+		}
+	}
+	return Plain, nil
+}
+
+// NewS256 generates a parameters for S256.
+func NewS256() (Params, error) {
+	b, err := random32()
+	if err != nil {
+		return Plain, xerrors.Errorf("could not generate a random: %w", err)
+	}
+	return computeS256(b), nil
+}
+
+func random32() ([]byte, error) {
+	b := make([]byte, 32)
+	if err := binary.Read(rand.Reader, binary.LittleEndian, b); err != nil {
+		return nil, xerrors.Errorf("read error: %w", err)
+	}
+	return b, nil
+}
+
+func computeS256(b []byte) Params {
+	v := base64URLEncode(b)
+	s := sha256.New()
+	_, _ = s.Write([]byte(v))
+	return Params{
+		CodeChallenge:       base64URLEncode(s.Sum(nil)),
+		CodeChallengeMethod: methodS256,
+		CodeVerifier:        v,
+	}
+}
+
+func base64URLEncode(b []byte) string {
+	return base64.URLEncoding.WithPadding(base64.NoPadding).EncodeToString(b)
+}

pkg/pkce/pkce_test.go

@@ -0,0 +1,61 @@
+package pkce
+
+import (
+	"testing"
+)
+
+func TestNew(t *testing.T) {
+	t.Run("S256", func(t *testing.T) {
+		p, err := New([]string{"plain", "S256"})
+		if err != nil {
+			t.Fatalf("New error: %s", err)
+		}
+		if p.CodeChallengeMethod != "S256" {
+			t.Errorf("CodeChallengeMethod wants S256 but was %s", p.CodeChallengeMethod)
+		}
+		if p.CodeChallenge == "" {
+			t.Errorf("CodeChallenge wants non-empty but was empty")
+		}
+		if p.CodeVerifier == "" {
+			t.Errorf("CodeVerifier wants non-empty but was empty")
+		}
+	})
+	t.Run("plain", func(t *testing.T) {
+		p, err := New([]string{"plain"})
+		if err != nil {
+			t.Fatalf("New error: %s", err)
+		}
+		if !p.IsZero() {
+			t.Errorf("IsZero wants true but was false")
+		}
+	})
+	t.Run("nil", func(t *testing.T) {
+		p, err := New(nil)
+		if err != nil {
+			t.Fatalf("New error: %s", err)
+		}
+		if !p.IsZero() {
+			t.Errorf("IsZero wants true but was false")
+		}
+	})
+}
+
+func Test_computeS256(t *testing.T) {
+	// Testdata described at:
+	// https://tools.ietf.org/html/rfc7636#appendix-B
+	b := []byte{
+		116, 24, 223, 180, 151, 153, 224, 37, 79, 250, 96, 125, 216, 173,
+		187, 186, 22, 212, 37, 77, 105, 214, 191, 240, 91, 88, 5, 88, 83,
+		132, 141, 121,
+	}
+	p := computeS256(b)
+	if want := "dBjftJeZ4CVP-mB92K27uhbUJU1p1r_wW1gFWFOEjXk"; want != p.CodeVerifier {
+		t.Errorf("CodeVerifier wants %s but was %s", want, p.CodeVerifier)
+	}
+	if want := "E9Melhoa2OwvFrEMTJguCHaoeK1t8URWbuGJSstw-cM"; want != p.CodeChallenge {
+		t.Errorf("CodeChallenge wants %s but was %s", want, p.CodeChallenge)
+	}
+	if p.CodeChallengeMethod != "S256" {
+		t.Errorf("CodeChallengeMethod wants S256 but was %s", p.CodeChallengeMethod)
+	}
+}

pkg/testing/httpserver/httpserver.go

@@ -0,0 +1,29 @@
+package main
+
+import (
+	"log"
+	"net/http"
+
+	"github.com/int128/kubelogin/pkg/usecases/authentication/authcode"
+)
+
+func main() {
+	http.HandleFunc("/BrowserSuccessHTML", func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Add("content-type", "text/html")
+		_, _ = w.Write([]byte(authcode.BrowserSuccessHTML))
+	})
+	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Add("content-type", "text/html")
+		_, _ = w.Write([]byte(`
+<html>
+<body>
+<ul>
+<li><a href="BrowserSuccessHTML">BrowserSuccessHTML</a></li>
+</ul>
+</body>
+</html>
+`))
+	})
+	log.Printf("http://localhost:8000")
+	log.Fatal(http.ListenAndServe("127.0.0.1:8000", nil))
+}

pkg/usecases/authentication/authcode.go

@@ -1,83 +0,0 @@
-package authentication
-
-import (
-	"context"
-
-	"github.com/int128/kubelogin/pkg/adaptors/browser"
-	"github.com/int128/kubelogin/pkg/adaptors/logger"
-	"github.com/int128/kubelogin/pkg/adaptors/oidcclient"
-	"github.com/int128/kubelogin/pkg/domain/oidc"
-	"golang.org/x/sync/errgroup"
-	"golang.org/x/xerrors"
-)
-
-// AuthCode provides the authentication code flow.
-type AuthCode struct {
-	Browser browser.Interface
-	Logger  logger.Interface
-}
-
-func (u *AuthCode) Do(ctx context.Context, o *AuthCodeOption, client oidcclient.Interface) (*Output, error) {
-	u.Logger.V(1).Infof("performing the authentication code flow")
-	state, err := oidc.NewState()
-	if err != nil {
-		return nil, xerrors.Errorf("could not generate a state: %w", err)
-	}
-	nonce, err := oidc.NewNonce()
-	if err != nil {
-		return nil, xerrors.Errorf("could not generate a nonce: %w", err)
-	}
-	p, err := oidc.NewPKCEParams()
-	if err != nil {
-		return nil, xerrors.Errorf("could not generate PKCE parameters: %w", err)
-	}
-	in := oidcclient.GetTokenByAuthCodeInput{
-		BindAddress:         o.BindAddress,
-		State:               state,
-		Nonce:               nonce,
-		CodeChallenge:       p.CodeChallenge,
-		CodeChallengeMethod: p.CodeChallengeMethod,
-		CodeVerifier:        p.CodeVerifier,
-	}
-	readyChan := make(chan string, 1)
-	defer close(readyChan)
-	var out Output
-	eg, ctx := errgroup.WithContext(ctx)
-	eg.Go(func() error {
-		select {
-		case url, ok := <-readyChan:
-			if !ok {
-				return nil
-			}
-			if o.SkipOpenBrowser {
-				u.Logger.Printf("Please visit the following URL in your browser: %s", url)
-				return nil
-			}
-			if err := u.Browser.Open(url); err != nil {
-				u.Logger.Printf(`error: could not open the browser: %s
-
-Please visit the following URL in your browser manually: %s`, err, url)
-				return nil
-			}
-			return nil
-		case <-ctx.Done():
-			return xerrors.Errorf("context cancelled while waiting for the local server: %w", ctx.Err())
-		}
-	})
-	eg.Go(func() error {
-		tokenSet, err := client.GetTokenByAuthCode(ctx, in, readyChan)
-		if err != nil {
-			return xerrors.Errorf("authorization code flow error: %w", err)
-		}
-		out = Output{
-			IDToken:       tokenSet.IDToken,
-			IDTokenClaims: tokenSet.IDTokenClaims,
-			RefreshToken:  tokenSet.RefreshToken,
-		}
-		return nil
-	})
-	if err := eg.Wait(); err != nil {
-		return nil, xerrors.Errorf("authentication error: %w", err)
-	}
-	return &out, nil
-}

pkg/usecases/authentication/authcode/browser.go

@@ -0,0 +1,104 @@
+package authcode
+
+import (
+	"context"
+	"time"
+
+	"github.com/int128/kubelogin/pkg/adaptors/browser"
+	"github.com/int128/kubelogin/pkg/adaptors/logger"
+	"github.com/int128/kubelogin/pkg/adaptors/oidcclient"
+	"github.com/int128/kubelogin/pkg/oidc"
+	"github.com/int128/kubelogin/pkg/pkce"
+	"golang.org/x/sync/errgroup"
+	"golang.org/x/xerrors"
+)
+
+type BrowserOption struct {
+	SkipOpenBrowser            bool
+	BindAddress                []string
+	AuthenticationTimeout      time.Duration
+	OpenURLAfterAuthentication string
+	RedirectURLHostname        string
+	AuthRequestExtraParams     map[string]string
+	LocalServerCertFile        string
+	LocalServerKeyFile         string
+}
+
+// Browser provides the authentication code flow using the browser.
+type Browser struct {
+	Browser browser.Interface
+	Logger  logger.Interface
+}
+
+func (u *Browser) Do(ctx context.Context, o *BrowserOption, client oidcclient.Interface) (*oidc.TokenSet, error) {
+	u.Logger.V(1).Infof("starting the authentication code flow using the browser")
+	state, err := oidc.NewState()
+	if err != nil {
+		return nil, xerrors.Errorf("could not generate a state: %w", err)
+	}
+	nonce, err := oidc.NewNonce()
+	if err != nil {
+		return nil, xerrors.Errorf("could not generate a nonce: %w", err)
+	}
+	p, err := pkce.New(client.SupportedPKCEMethods())
+	if err != nil {
+		return nil, xerrors.Errorf("could not generate PKCE parameters: %w", err)
+	}
+	successHTML := BrowserSuccessHTML
+	if o.OpenURLAfterAuthentication != "" {
+		successHTML = BrowserRedirectHTML(o.OpenURLAfterAuthentication)
+	}
+	in := oidcclient.GetTokenByAuthCodeInput{
+		BindAddress:            o.BindAddress,
+		State:                  state,
+		Nonce:                  nonce,
+		PKCEParams:             p,
+		RedirectURLHostname:    o.RedirectURLHostname,
+		AuthRequestExtraParams: o.AuthRequestExtraParams,
+		LocalServerSuccessHTML: successHTML,
+		LocalServerCertFile:    o.LocalServerCertFile,
+		LocalServerKeyFile:     o.LocalServerKeyFile,
+	}
+	ctx, cancel := context.WithTimeout(ctx, o.AuthenticationTimeout)
+	defer cancel()
+	readyChan := make(chan string, 1)
+	var out *oidc.TokenSet
+	var eg errgroup.Group
+	eg.Go(func() error {
+		select {
+		case url, ok := <-readyChan:
+			if !ok {
+				return nil
+			}
+			if o.SkipOpenBrowser {
+				u.Logger.Printf("Please visit the following URL in your browser: %s", url)
+				return nil
+			}
+			u.Logger.V(1).Infof("opening %s in the browser", url)
+			if err := u.Browser.Open(url); err != nil {
+				u.Logger.Printf(`error: could not open the browser: %s
+
+Please visit the following URL in your browser manually: %s`, err, url)
+				return nil
+			}
+			return nil
+		case <-ctx.Done():
+			return xerrors.Errorf("context cancelled while waiting for the local server: %w", ctx.Err())
+		}
+	})
+	eg.Go(func() error {
+		defer close(readyChan)
+		tokenSet, err := client.GetTokenByAuthCode(ctx, in, readyChan)
+		if err != nil {
+			return xerrors.Errorf("authorization code flow error: %w", err)
+		}
+		out = tokenSet
+		u.Logger.V(1).Infof("got a token set by the authorization code flow")
+		return nil
+	})
+	if err := eg.Wait(); err != nil {
+		return nil, xerrors.Errorf("authentication error: %w", err)
+	}
+	u.Logger.V(1).Infof("finished the authorization code flow via the browser")
+	return out, nil
+}

pkg/usecases/authentication/authcode/browser_html.go

@@ -0,0 +1,60 @@
+package authcode
+
+import (
+	"fmt"
+	"net/url"
+)
+
+// BrowserSuccessHTML is the success page on browser based authentication.
+const BrowserSuccessHTML = `
+<!DOCTYPE html>
+<html lang="en">
+<head>
+	<meta charset="UTF-8">
+	<title>Authenticated</title>
+	<script>
+		window.close()
+	</script>
+	<style>
+		body {
+			background-color: #eee;
+			margin: 0;
+			padding: 0;
+			font-family: sans-serif;
+		}
+		.placeholder {
+			margin: 2em;
+			padding: 2em;
+			background-color: #fff;
+			border-radius: 1em;
+		}
+	</style>
+</head>
+<body>
+	<div class="placeholder">
+		<h1>Authenticated</h1>
+		<p>You have logged in to the cluster. You can close this window.</p>
+	</div>
+</body>
+</html>
+`
+
+func BrowserRedirectHTML(target string) string {
+	targetURL, err := url.Parse(target)
+	if err != nil {
+		return fmt.Sprintf(`invalid URL is set: %s`, err)
+	}
+	return fmt.Sprintf(`
+<!DOCTYPE html>
+<html lang="en">
+<head>
+	<meta http-equiv="refresh" content="0;URL=%s">
+	<meta charset="UTF-8">
+	<title>Authenticated</title>
+</head>
+<body>
+	<a href="%s">redirecting...</a>
+</body>
+</html>
+`, targetURL, targetURL)
+}

pkg/usecases/authentication/authcode/browser_test.go

@@ -1,4 +1,4 @@
-package authentication
+package authcode
 
 import (
 	"context"
@@ -10,11 +10,12 @@ import (
 	"github.com/int128/kubelogin/pkg/adaptors/browser/mock_browser"
 	"github.com/int128/kubelogin/pkg/adaptors/oidcclient"
 	"github.com/int128/kubelogin/pkg/adaptors/oidcclient/mock_oidcclient"
-	"github.com/int128/kubelogin/pkg/domain/jwt"
+	"github.com/int128/kubelogin/pkg/jwt"
+	"github.com/int128/kubelogin/pkg/oidc"
 	"github.com/int128/kubelogin/pkg/testing/logger"
 )
 
-func TestAuthCode_Do(t *testing.T) {
+func TestBrowser_Do(t *testing.T) {
 	dummyTokenClaims := jwt.Claims{
 		Subject: "YOUR_SUBJECT",
 		Expiry:  time.Date(2019, 1, 2, 3, 4, 5, 0, time.UTC),
@@ -27,29 +28,54 @@ func TestAuthCode_Do(t *testing.T) {
 		defer ctrl.Finish()
 		ctx, cancel := context.WithTimeout(context.TODO(), timeout)
 		defer cancel()
-		o := &AuthCodeOption{
-			BindAddress:     []string{"127.0.0.1:8000"},
-			SkipOpenBrowser: true,
+		o := &BrowserOption{
+			BindAddress:                []string{"127.0.0.1:8000"},
+			SkipOpenBrowser:            true,
+			AuthenticationTimeout:      10 * time.Second,
+			LocalServerCertFile:        "/path/to/local-server-cert",
+			LocalServerKeyFile:         "/path/to/local-server-key",
+			OpenURLAfterAuthentication: "https://example.com/success.html",
+			RedirectURLHostname:        "localhost",
+			AuthRequestExtraParams:     map[string]string{"ttl": "86400", "reauth": "true"},
 		}
 		mockOIDCClient := mock_oidcclient.NewMockInterface(ctrl)
+		mockOIDCClient.EXPECT().SupportedPKCEMethods()
 		mockOIDCClient.EXPECT().
 			GetTokenByAuthCode(gomock.Any(), gomock.Any(), gomock.Any()).
-			Do(func(_ context.Context, _ oidcclient.GetTokenByAuthCodeInput, readyChan chan<- string) {
+			Do(func(_ context.Context, in oidcclient.GetTokenByAuthCodeInput, readyChan chan<- string) {
+				if diff := cmp.Diff(o.BindAddress, in.BindAddress); diff != "" {
+					t.Errorf("BindAddress mismatch (-want +got):\n%s", diff)
+				}
+				if diff := cmp.Diff(BrowserRedirectHTML("https://example.com/success.html"), in.LocalServerSuccessHTML); diff != "" {
+					t.Errorf("LocalServerSuccessHTML mismatch (-want +got):\n%s", diff)
+				}
+				if diff := cmp.Diff(o.RedirectURLHostname, in.RedirectURLHostname); diff != "" {
+					t.Errorf("RedirectURLHostname mismatch (-want +got):\n%s", diff)
+				}
+				if diff := cmp.Diff(o.AuthRequestExtraParams, in.AuthRequestExtraParams); diff != "" {
+					t.Errorf("AuthRequestExtraParams mismatch (-want +got):\n%s", diff)
+				}
+				if diff := cmp.Diff(o.LocalServerKeyFile, in.LocalServerKeyFile); diff != "" {
+					t.Errorf("LocalServerKeyFile mismatch (-want +got):\n%s", diff)
+				}
+				if diff := cmp.Diff(o.LocalServerCertFile, in.LocalServerCertFile); diff != "" {
+					t.Errorf("LocalServerCertFile mismatch (-want +got):\n%s", diff)
+				}
 				readyChan <- "LOCAL_SERVER_URL"
 			}).
-			Return(&oidcclient.TokenSet{
+			Return(&oidc.TokenSet{
 				IDToken:       "YOUR_ID_TOKEN",
 				RefreshToken:  "YOUR_REFRESH_TOKEN",
 				IDTokenClaims: dummyTokenClaims,
 			}, nil)
-		u := AuthCode{
+		u := Browser{
 			Logger: logger.New(t),
 		}
 		got, err := u.Do(ctx, o, mockOIDCClient)
 		if err != nil {
 			t.Errorf("Do returned error: %+v", err)
 		}
-		want := &Output{
+		want := &oidc.TokenSet{
 			IDToken:       "YOUR_ID_TOKEN",
 			RefreshToken:  "YOUR_REFRESH_TOKEN",
 			IDTokenClaims: dummyTokenClaims,
@@ -64,16 +90,18 @@ func TestAuthCode_Do(t *testing.T) {
 		defer ctrl.Finish()
 		ctx, cancel := context.WithTimeout(context.TODO(), timeout)
 		defer cancel()
-		o := &AuthCodeOption{
-			BindAddress: []string{"127.0.0.1:8000"},
+		o := &BrowserOption{
+			BindAddress:           []string{"127.0.0.1:8000"},
+			AuthenticationTimeout: 10 * time.Second,
 		}
 		mockOIDCClient := mock_oidcclient.NewMockInterface(ctrl)
+		mockOIDCClient.EXPECT().SupportedPKCEMethods()
 		mockOIDCClient.EXPECT().
 			GetTokenByAuthCode(gomock.Any(), gomock.Any(), gomock.Any()).
 			Do(func(_ context.Context, _ oidcclient.GetTokenByAuthCodeInput, readyChan chan<- string) {
 				readyChan <- "LOCAL_SERVER_URL"
 			}).
-			Return(&oidcclient.TokenSet{
+			Return(&oidc.TokenSet{
 				IDToken:       "YOUR_ID_TOKEN",
 				RefreshToken:  "YOUR_REFRESH_TOKEN",
 				IDTokenClaims: dummyTokenClaims,
@@ -81,7 +109,7 @@ func TestAuthCode_Do(t *testing.T) {
 		mockBrowser := mock_browser.NewMockInterface(ctrl)
 		mockBrowser.EXPECT().
 			Open("LOCAL_SERVER_URL")
-		u := AuthCode{
+		u := Browser{
 			Logger:  logger.New(t),
 			Browser: mockBrowser,
 		}
@@ -89,7 +117,7 @@ func TestAuthCode_Do(t *testing.T) {
 		if err != nil {
 			t.Errorf("Do returned error: %+v", err)
 		}
-		want := &Output{
+		want := &oidc.TokenSet{
 			IDToken:       "YOUR_ID_TOKEN",
 			RefreshToken:  "YOUR_REFRESH_TOKEN",
 			IDTokenClaims: dummyTokenClaims,

pkg/usecases/authentication/authcode/keyboard.go

@@ -0,0 +1,66 @@
+package authcode
+
+import (
+	"context"
+
+	"github.com/int128/kubelogin/pkg/adaptors/logger"
+	"github.com/int128/kubelogin/pkg/adaptors/oidcclient"
+	"github.com/int128/kubelogin/pkg/adaptors/reader"
+	"github.com/int128/kubelogin/pkg/oidc"
+	"github.com/int128/kubelogin/pkg/pkce"
+	"golang.org/x/xerrors"
+)
+
+const keyboardPrompt = "Enter code: "
+const oobRedirectURI = "urn:ietf:wg:oauth:2.0:oob"
+
+type KeyboardOption struct {
+	AuthRequestExtraParams map[string]string
+}
+
+// Keyboard provides the authorization code flow with keyboard interactive.
+type Keyboard struct {
+	Reader reader.Interface
+	Logger logger.Interface
+}
+
+func (u *Keyboard) Do(ctx context.Context, o *KeyboardOption, client oidcclient.Interface) (*oidc.TokenSet, error) {
+	u.Logger.V(1).Infof("starting the authorization code flow with keyboard interactive")
+	state, err := oidc.NewState()
+	if err != nil {
+		return nil, xerrors.Errorf("could not generate a state: %w", err)
+	}
+	nonce, err := oidc.NewNonce()
+	if err != nil {
+		return nil, xerrors.Errorf("could not generate a nonce: %w", err)
+	}
+	p, err := pkce.New(client.SupportedPKCEMethods())
+	if err != nil {
+		return nil, xerrors.Errorf("could not generate PKCE parameters: %w", err)
+	}
+	authCodeURL := client.GetAuthCodeURL(oidcclient.AuthCodeURLInput{
+		State:                  state,
+		Nonce:                  nonce,
+		PKCEParams:             p,
+		RedirectURI:            oobRedirectURI,
+		AuthRequestExtraParams: o.AuthRequestExtraParams,
+	})
+	u.Logger.Printf("Please visit the following URL in your browser: %s", authCodeURL)
+	code, err := u.Reader.ReadString(keyboardPrompt)
+	if err != nil {
+		return nil, xerrors.Errorf("could not read an authorization code: %w", err)
+	}
+
+	u.Logger.V(1).Infof("exchanging the code and token")
+	tokenSet, err := client.ExchangeAuthCode(ctx, oidcclient.ExchangeAuthCodeInput{
+		Code:        code,
+		PKCEParams:  p,
+		Nonce:       nonce,
+		RedirectURI: oobRedirectURI,
+	})
+	if err != nil {
+		return nil, xerrors.Errorf("could not exchange the authorization code: %w", err)
+	}
+	u.Logger.V(1).Infof("finished the authorization code flow with keyboard interactive")
+	return tokenSet, nil
+}

pkg/usecases/authentication/authcode/keyboard_test.go

@@ -1,4 +1,4 @@
-package authentication
+package authcode
 
 import (
 	"context"
@@ -10,13 +10,14 @@ import (
 	"github.com/int128/kubelogin/pkg/adaptors/oidcclient"
 	"github.com/int128/kubelogin/pkg/adaptors/oidcclient/mock_oidcclient"
 	"github.com/int128/kubelogin/pkg/adaptors/reader/mock_reader"
-	"github.com/int128/kubelogin/pkg/domain/jwt"
+	"github.com/int128/kubelogin/pkg/jwt"
+	"github.com/int128/kubelogin/pkg/oidc"
 	"github.com/int128/kubelogin/pkg/testing/logger"
 )
 
 var nonNil = gomock.Not(gomock.Nil())
 
-func TestAuthCodeKeyboard_Do(t *testing.T) {
+func TestKeyboard_Do(t *testing.T) {
 	dummyTokenClaims := jwt.Claims{
 		Subject: "YOUR_SUBJECT",
 		Expiry:  time.Date(2019, 1, 2, 3, 4, 5, 0, time.UTC),
@@ -29,9 +30,18 @@ func TestAuthCodeKeyboard_Do(t *testing.T) {
 		defer ctrl.Finish()
 		ctx, cancel := context.WithTimeout(context.TODO(), timeout)
 		defer cancel()
+		o := &KeyboardOption{
+			AuthRequestExtraParams: map[string]string{"ttl": "86400", "reauth": "true"},
+		}
 		mockOIDCClient := mock_oidcclient.NewMockInterface(ctrl)
+		mockOIDCClient.EXPECT().SupportedPKCEMethods()
 		mockOIDCClient.EXPECT().
 			GetAuthCodeURL(nonNil).
+			Do(func(in oidcclient.AuthCodeURLInput) {
+				if diff := cmp.Diff(o.AuthRequestExtraParams, in.AuthRequestExtraParams); diff != "" {
+					t.Errorf("AuthRequestExtraParams mismatch (-want +got):\n%s", diff)
+				}
+			}).
 			Return("https://issuer.example.com/auth")
 		mockOIDCClient.EXPECT().
 			ExchangeAuthCode(nonNil, nonNil).
@@ -40,24 +50,24 @@ func TestAuthCodeKeyboard_Do(t *testing.T) {
 					t.Errorf("Code wants YOUR_AUTH_CODE but was %s", in.Code)
 				}
 			}).
-			Return(&oidcclient.TokenSet{
+			Return(&oidc.TokenSet{
 				IDToken:       "YOUR_ID_TOKEN",
 				IDTokenClaims: dummyTokenClaims,
 				RefreshToken:  "YOUR_REFRESH_TOKEN",
 			}, nil)
 		mockReader := mock_reader.NewMockInterface(ctrl)
 		mockReader.EXPECT().
-			ReadString(authCodeKeyboardPrompt).
+			ReadString(keyboardPrompt).
 			Return("YOUR_AUTH_CODE", nil)
-		u := AuthCodeKeyboard{
+		u := Keyboard{
 			Reader: mockReader,
 			Logger: logger.New(t),
 		}
-		got, err := u.Do(ctx, nil, mockOIDCClient)
+		got, err := u.Do(ctx, o, mockOIDCClient)
 		if err != nil {
 			t.Errorf("Do returned error: %+v", err)
 		}
-		want := &Output{
+		want := &oidc.TokenSet{
 			IDToken:       "YOUR_ID_TOKEN",
 			IDTokenClaims: dummyTokenClaims,
 			RefreshToken:  "YOUR_REFRESH_TOKEN",

pkg/usecases/authentication/authcode_keyboard.go

@@ -1,63 +0,0 @@
-package authentication
-
-import (
-	"context"
-
-	"github.com/int128/kubelogin/pkg/adaptors/logger"
-	"github.com/int128/kubelogin/pkg/adaptors/oidcclient"
-	"github.com/int128/kubelogin/pkg/adaptors/reader"
-	"github.com/int128/kubelogin/pkg/domain/oidc"
-	"golang.org/x/xerrors"
-)
-
-const authCodeKeyboardPrompt = "Enter code: "
-const oobRedirectURI = "urn:ietf:wg:oauth:2.0:oob"
-
-// AuthCodeKeyboard provides the authorization code flow with keyboard interactive.
-type AuthCodeKeyboard struct {
-	Reader reader.Interface
-	Logger logger.Interface
-}
-
-func (u *AuthCodeKeyboard) Do(ctx context.Context, _ *AuthCodeKeyboardOption, client oidcclient.Interface) (*Output, error) {
-	u.Logger.V(1).Infof("performing the authorization code flow with keyboard interactive")
-	state, err := oidc.NewState()
-	if err != nil {
-		return nil, xerrors.Errorf("could not generate a state: %w", err)
-	}
-	nonce, err := oidc.NewNonce()
-	if err != nil {
-		return nil, xerrors.Errorf("could not generate a nonce: %w", err)
-	}
-	p, err := oidc.NewPKCEParams()
-	if err != nil {
-		return nil, xerrors.Errorf("could not generate PKCE parameters: %w", err)
-	}
-	authCodeURL := client.GetAuthCodeURL(oidcclient.AuthCodeURLInput{
-		State:               state,
-		Nonce:               nonce,
-		CodeChallenge:       p.CodeChallenge,
-		CodeChallengeMethod: p.CodeChallengeMethod,
-		RedirectURI:         oobRedirectURI,
-	})
-	u.Logger.Printf("Open %s", authCodeURL)
-	code, err := u.Reader.ReadString(authCodeKeyboardPrompt)
-	if err != nil {
-		return nil, xerrors.Errorf("could not read an authorization code: %w", err)
-	}
-
-	tokenSet, err := client.ExchangeAuthCode(ctx, oidcclient.ExchangeAuthCodeInput{
-		Code:         code,
-		CodeVerifier: p.CodeVerifier,
-		Nonce:        nonce,
-		RedirectURI:  oobRedirectURI,
-	})
-	if err != nil {
-		return nil, xerrors.Errorf("could not exchange the authorization code: %w", err)
-	}
-	return &Output{
-		IDToken:       tokenSet.IDToken,
-		IDTokenClaims: tokenSet.IDTokenClaims,
-		RefreshToken:  tokenSet.RefreshToken,
-	}, nil
-}

pkg/usecases/authentication/authentication.go

@@ -8,7 +8,10 @@ import (
 	"github.com/int128/kubelogin/pkg/adaptors/clock"
 	"github.com/int128/kubelogin/pkg/adaptors/logger"
 	"github.com/int128/kubelogin/pkg/adaptors/oidcclient"
-	"github.com/int128/kubelogin/pkg/domain/jwt"
+	"github.com/int128/kubelogin/pkg/jwt"
+	"github.com/int128/kubelogin/pkg/oidc"
+	"github.com/int128/kubelogin/pkg/usecases/authentication/authcode"
+	"github.com/int128/kubelogin/pkg/usecases/authentication/ropc"
 	"golang.org/x/xerrors"
 )
 
@@ -18,9 +21,9 @@ import (
 var Set = wire.NewSet(
 	wire.Struct(new(Authentication), "*"),
 	wire.Bind(new(Interface), new(*Authentication)),
-	wire.Struct(new(AuthCode), "*"),
-	wire.Struct(new(AuthCodeKeyboard), "*"),
-	wire.Struct(new(ROPC), "*"),
+	wire.Struct(new(authcode.Browser), "*"),
+	wire.Struct(new(authcode.Keyboard), "*"),
+	wire.Struct(new(ropc.ROPC), "*"),
 )
 
 type Interface interface {
@@ -41,34 +44,17 @@ type Input struct {
 }
 
 type GrantOptionSet struct {
-	AuthCodeOption         *AuthCodeOption
-	AuthCodeKeyboardOption *AuthCodeKeyboardOption
-	ROPCOption             *ROPCOption
-}
-
-type AuthCodeOption struct {
-	SkipOpenBrowser bool
-	BindAddress     []string
-}
-
-type AuthCodeKeyboardOption struct{}
-
-type ROPCOption struct {
-	Username string
-	Password string // If empty, read a password using Reader.ReadPassword()
+	AuthCodeBrowserOption  *authcode.BrowserOption
+	AuthCodeKeyboardOption *authcode.KeyboardOption
+	ROPCOption             *ropc.Option
 }
 
 // Output represents an output DTO of the Authentication use-case.
 type Output struct {
 	AlreadyHasValidIDToken bool
-	IDToken                string
-	IDTokenClaims          jwt.Claims
-	RefreshToken           string
+	TokenSet               oidc.TokenSet
 }
 
-const usernamePrompt = "Username: "
-const passwordPrompt = "Password: "
-
 // Authentication provides the internal use-case of authentication.
 //
 // If the IDToken is not set, it performs the authentication flow.
@@ -83,12 +69,12 @@ const passwordPrompt = "Password: "
 // If the Password is not set, it asks a password by the prompt.
 //
 type Authentication struct {
-	NewOIDCClient    oidcclient.NewFunc
+	OIDCClient       oidcclient.FactoryInterface
 	Logger           logger.Interface
 	Clock            clock.Interface
-	AuthCode         *AuthCode
-	AuthCodeKeyboard *AuthCodeKeyboard
-	ROPC             *ROPC
+	AuthCodeBrowser  *authcode.Browser
+	AuthCodeKeyboard *authcode.Keyboard
+	ROPC             *ropc.ROPC
 }
 
 func (u *Authentication) Do(ctx context.Context, in Input) (*Output, error) {
@@ -105,23 +91,24 @@ func (u *Authentication) Do(ctx context.Context, in Input) (*Output, error) {
 			u.Logger.V(1).Infof("you already have a valid token until %s", claims.Expiry)
 			return &Output{
 				AlreadyHasValidIDToken: true,
-				IDToken:                in.IDToken,
-				RefreshToken:           in.RefreshToken,
-				IDTokenClaims:          *claims,
+				TokenSet: oidc.TokenSet{
+					IDToken:       in.IDToken,
+					RefreshToken:  in.RefreshToken,
+					IDTokenClaims: *claims,
+				},
 			}, nil
 		}
 		u.Logger.V(1).Infof("you have an expired token at %s", claims.Expiry)
 	}
 
 	u.Logger.V(1).Infof("initializing an OpenID Connect client")
-	client, err := u.NewOIDCClient(ctx, oidcclient.Config{
+	client, err := u.OIDCClient.New(ctx, oidcclient.Config{
 		IssuerURL:     in.IssuerURL,
 		ClientID:      in.ClientID,
 		ClientSecret:  in.ClientSecret,
 		ExtraScopes:   in.ExtraScopes,
 		CertPool:      in.CertPool,
 		SkipTLSVerify: in.SkipTLSVerify,
-		Logger:        u.Logger,
 	})
 	if err != nil {
 		return nil, xerrors.Errorf("oidc error: %w", err)
@@ -132,22 +119,36 @@ func (u *Authentication) Do(ctx context.Context, in Input) (*Output, error) {
 		out, err := client.Refresh(ctx, in.RefreshToken)
 		if err == nil {
 			return &Output{
-				IDToken:       out.IDToken,
-				IDTokenClaims: out.IDTokenClaims,
-				RefreshToken:  out.RefreshToken,
+				TokenSet: oidc.TokenSet{
+					IDToken:       out.IDToken,
+					IDTokenClaims: out.IDTokenClaims,
+					RefreshToken:  out.RefreshToken,
+				},
 			}, nil
 		}
 		u.Logger.V(1).Infof("could not refresh the token: %s", err)
 	}
 
-	if in.GrantOptionSet.AuthCodeOption != nil {
-		return u.AuthCode.Do(ctx, in.GrantOptionSet.AuthCodeOption, client)
+	if in.GrantOptionSet.AuthCodeBrowserOption != nil {
+		tokenSet, err := u.AuthCodeBrowser.Do(ctx, in.GrantOptionSet.AuthCodeBrowserOption, client)
+		if err != nil {
+			return nil, xerrors.Errorf("authcode-browser error: %w", err)
+		}
+		return &Output{TokenSet: *tokenSet}, nil
 	}
 	if in.GrantOptionSet.AuthCodeKeyboardOption != nil {
-		return u.AuthCodeKeyboard.Do(ctx, in.GrantOptionSet.AuthCodeKeyboardOption, client)
+		tokenSet, err := u.AuthCodeKeyboard.Do(ctx, in.GrantOptionSet.AuthCodeKeyboardOption, client)
+		if err != nil {
+			return nil, xerrors.Errorf("authcode-keyboard error: %w", err)
+		}
+		return &Output{TokenSet: *tokenSet}, nil
 	}
 	if in.GrantOptionSet.ROPCOption != nil {
-		return u.ROPC.Do(ctx, in.GrantOptionSet.ROPCOption, client)
+		tokenSet, err := u.ROPC.Do(ctx, in.GrantOptionSet.ROPCOption, client)
+		if err != nil {
+			return nil, xerrors.Errorf("ropc error: %w", err)
+		}
+		return &Output{TokenSet: *tokenSet}, nil
 	}
 	return nil, xerrors.Errorf("any authorization grant must be set")
 }

pkg/usecases/authentication/authentication_test.go

@@ -7,19 +7,18 @@ import (
 
 	"github.com/golang/mock/gomock"
 	"github.com/google/go-cmp/cmp"
-	"github.com/google/go-cmp/cmp/cmpopts"
-	"github.com/int128/kubelogin/pkg/adaptors/logger"
 	"github.com/int128/kubelogin/pkg/adaptors/oidcclient"
 	"github.com/int128/kubelogin/pkg/adaptors/oidcclient/mock_oidcclient"
-	"github.com/int128/kubelogin/pkg/domain/jwt"
+	"github.com/int128/kubelogin/pkg/jwt"
+	"github.com/int128/kubelogin/pkg/oidc"
 	"github.com/int128/kubelogin/pkg/testing/clock"
 	testingJWT "github.com/int128/kubelogin/pkg/testing/jwt"
 	testingLogger "github.com/int128/kubelogin/pkg/testing/logger"
+	"github.com/int128/kubelogin/pkg/usecases/authentication/authcode"
+	"github.com/int128/kubelogin/pkg/usecases/authentication/ropc"
 	"golang.org/x/xerrors"
 )
 
-var cmpIgnoreLogger = cmpopts.IgnoreInterfaces(struct{ logger.Interface }{})
-
 func TestAuthentication_Do(t *testing.T) {
 	timeout := 5 * time.Second
 	expiryTime := time.Date(2020, 1, 2, 3, 4, 5, 0, time.UTC)
@@ -55,15 +54,17 @@ func TestAuthentication_Do(t *testing.T) {
 		}
 		want := &Output{
 			AlreadyHasValidIDToken: true,
-			IDToken:                cachedIDToken,
-			IDTokenClaims: jwt.Claims{
-				Subject: "SUBJECT",
-				Expiry:  expiryTime,
-				Pretty: `{
+			TokenSet: oidc.TokenSet{
+				IDToken: cachedIDToken,
+				IDTokenClaims: jwt.Claims{
+					Subject: "SUBJECT",
+					Expiry:  expiryTime,
+					Pretty: `{
   "exp": 1577934245,
   "iss": "https://issuer.example.com",
   "sub": "SUBJECT"
 }`,
+				},
 			},
 		}
 		if diff := cmp.Diff(want, got); diff != "" {
@@ -86,22 +87,20 @@ func TestAuthentication_Do(t *testing.T) {
 		mockOIDCClient := mock_oidcclient.NewMockInterface(ctrl)
 		mockOIDCClient.EXPECT().
 			Refresh(ctx, "VALID_REFRESH_TOKEN").
-			Return(&oidcclient.TokenSet{
+			Return(&oidc.TokenSet{
 				IDToken:       "NEW_ID_TOKEN",
 				RefreshToken:  "NEW_REFRESH_TOKEN",
 				IDTokenClaims: dummyClaims,
 			}, nil)
 		u := Authentication{
-			NewOIDCClient: func(_ context.Context, got oidcclient.Config) (oidcclient.Interface, error) {
-				want := oidcclient.Config{
+			OIDCClient: &oidcclientFactory{
+				t:      t,
+				client: mockOIDCClient,
+				want: oidcclient.Config{
 					IssuerURL:    "https://issuer.example.com",
 					ClientID:     "YOUR_CLIENT_ID",
 					ClientSecret: "YOUR_CLIENT_SECRET",
-				}
-				if diff := cmp.Diff(want, got, cmpIgnoreLogger); diff != "" {
-					t.Errorf("mismatch (-want +got):\n%s", diff)
-				}
-				return mockOIDCClient, nil
+				},
 			},
 			Logger: testingLogger.New(t),
 			Clock:  clock.Fake(expiryTime.Add(+time.Hour)),
@@ -111,25 +110,28 @@ func TestAuthentication_Do(t *testing.T) {
 			t.Errorf("Do returned error: %+v", err)
 		}
 		want := &Output{
-			IDToken:       "NEW_ID_TOKEN",
-			RefreshToken:  "NEW_REFRESH_TOKEN",
-			IDTokenClaims: dummyClaims,
+			TokenSet: oidc.TokenSet{
+				IDToken:       "NEW_ID_TOKEN",
+				RefreshToken:  "NEW_REFRESH_TOKEN",
+				IDTokenClaims: dummyClaims,
+			},
 		}
 		if diff := cmp.Diff(want, got); diff != "" {
 			t.Errorf("mismatch (-want +got):\n%s", diff)
 		}
 	})
 
-	t.Run("HasExpiredRefreshToken/AuthCode", func(t *testing.T) {
+	t.Run("HasExpiredRefreshToken/Browser", func(t *testing.T) {
 		ctrl := gomock.NewController(t)
 		defer ctrl.Finish()
 		ctx, cancel := context.WithTimeout(context.TODO(), timeout)
 		defer cancel()
 		in := Input{
 			GrantOptionSet: GrantOptionSet{
-				AuthCodeOption: &AuthCodeOption{
-					BindAddress:     []string{"127.0.0.1:8000"},
-					SkipOpenBrowser: true,
+				AuthCodeBrowserOption: &authcode.BrowserOption{
+					BindAddress:           []string{"127.0.0.1:8000"},
+					SkipOpenBrowser:       true,
+					AuthenticationTimeout: 10 * time.Second,
 				},
 			},
 			IssuerURL:    "https://issuer.example.com",
@@ -139,6 +141,7 @@ func TestAuthentication_Do(t *testing.T) {
 			RefreshToken: "EXPIRED_REFRESH_TOKEN",
 		}
 		mockOIDCClient := mock_oidcclient.NewMockInterface(ctrl)
+		mockOIDCClient.EXPECT().SupportedPKCEMethods()
 		mockOIDCClient.EXPECT().
 			Refresh(ctx, "EXPIRED_REFRESH_TOKEN").
 			Return(nil, xerrors.New("token has expired"))
@@ -147,26 +150,24 @@ func TestAuthentication_Do(t *testing.T) {
 			Do(func(_ context.Context, _ oidcclient.GetTokenByAuthCodeInput, readyChan chan<- string) {
 				readyChan <- "LOCAL_SERVER_URL"
 			}).
-			Return(&oidcclient.TokenSet{
+			Return(&oidc.TokenSet{
 				IDToken:       "NEW_ID_TOKEN",
 				RefreshToken:  "NEW_REFRESH_TOKEN",
 				IDTokenClaims: dummyClaims,
 			}, nil)
 		u := Authentication{
-			NewOIDCClient: func(_ context.Context, got oidcclient.Config) (oidcclient.Interface, error) {
-				want := oidcclient.Config{
+			OIDCClient: &oidcclientFactory{
+				t:      t,
+				client: mockOIDCClient,
+				want: oidcclient.Config{
 					IssuerURL:    "https://issuer.example.com",
 					ClientID:     "YOUR_CLIENT_ID",
 					ClientSecret: "YOUR_CLIENT_SECRET",
-				}
-				if diff := cmp.Diff(want, got, cmpIgnoreLogger); diff != "" {
-					t.Errorf("mismatch (-want +got):\n%s", diff)
-				}
-				return mockOIDCClient, nil
+				},
 			},
 			Logger: testingLogger.New(t),
 			Clock:  clock.Fake(expiryTime.Add(+time.Hour)),
-			AuthCode: &AuthCode{
+			AuthCodeBrowser: &authcode.Browser{
 				Logger: testingLogger.New(t),
 			},
 		}
@@ -175,9 +176,11 @@ func TestAuthentication_Do(t *testing.T) {
 			t.Errorf("Do returned error: %+v", err)
 		}
 		want := &Output{
-			IDToken:       "NEW_ID_TOKEN",
-			RefreshToken:  "NEW_REFRESH_TOKEN",
-			IDTokenClaims: dummyClaims,
+			TokenSet: oidc.TokenSet{
+				IDToken:       "NEW_ID_TOKEN",
+				RefreshToken:  "NEW_REFRESH_TOKEN",
+				IDTokenClaims: dummyClaims,
+			},
 		}
 		if diff := cmp.Diff(want, got); diff != "" {
 			t.Errorf("mismatch (-want +got):\n%s", diff)
@@ -191,7 +194,7 @@ func TestAuthentication_Do(t *testing.T) {
 		defer cancel()
 		in := Input{
 			GrantOptionSet: GrantOptionSet{
-				ROPCOption: &ROPCOption{
+				ROPCOption: &ropc.Option{
 					Username: "USER",
 					Password: "PASS",
 				},
@@ -203,25 +206,23 @@ func TestAuthentication_Do(t *testing.T) {
 		mockOIDCClient := mock_oidcclient.NewMockInterface(ctrl)
 		mockOIDCClient.EXPECT().
 			GetTokenByROPC(gomock.Any(), "USER", "PASS").
-			Return(&oidcclient.TokenSet{
+			Return(&oidc.TokenSet{
 				IDToken:       "YOUR_ID_TOKEN",
 				RefreshToken:  "YOUR_REFRESH_TOKEN",
 				IDTokenClaims: dummyClaims,
 			}, nil)
 		u := Authentication{
-			NewOIDCClient: func(_ context.Context, got oidcclient.Config) (oidcclient.Interface, error) {
-				want := oidcclient.Config{
+			OIDCClient: &oidcclientFactory{
+				t:      t,
+				client: mockOIDCClient,
+				want: oidcclient.Config{
 					IssuerURL:    "https://issuer.example.com",
 					ClientID:     "YOUR_CLIENT_ID",
 					ClientSecret: "YOUR_CLIENT_SECRET",
-				}
-				if diff := cmp.Diff(want, got, cmpIgnoreLogger); diff != "" {
-					t.Errorf("mismatch (-want +got):\n%s", diff)
-				}
-				return mockOIDCClient, nil
+				},
 			},
 			Logger: testingLogger.New(t),
-			ROPC: &ROPC{
+			ROPC: &ropc.ROPC{
 				Logger: testingLogger.New(t),
 			},
 		}
@@ -230,12 +231,27 @@ func TestAuthentication_Do(t *testing.T) {
 			t.Errorf("Do returned error: %+v", err)
 		}
 		want := &Output{
-			IDToken:       "YOUR_ID_TOKEN",
-			RefreshToken:  "YOUR_REFRESH_TOKEN",
-			IDTokenClaims: dummyClaims,
+			TokenSet: oidc.TokenSet{
+				IDToken:       "YOUR_ID_TOKEN",
+				RefreshToken:  "YOUR_REFRESH_TOKEN",
+				IDTokenClaims: dummyClaims,
+			},
 		}
 		if diff := cmp.Diff(want, got); diff != "" {
 			t.Errorf("mismatch (-want +got):\n%s", diff)
 		}
 	})
 }
+
+type oidcclientFactory struct {
+	t      *testing.T
+	client oidcclient.Interface
+	want   oidcclient.Config
+}
+
+func (f *oidcclientFactory) New(_ context.Context, got oidcclient.Config) (oidcclient.Interface, error) {
+	if diff := cmp.Diff(f.want, got); diff != "" {
+		f.t.Errorf("mismatch (-want +got):\n%s", diff)
+	}
+	return f.client, nil
+}

pkg/usecases/authentication/mock_authentication/mock_authentication.go

@@ -11,30 +11,30 @@ import (
 	reflect "reflect"
 )
 
-// MockInterface is a mock of Interface interface
+// MockInterface is a mock of Interface interface.
 type MockInterface struct {
 	ctrl     *gomock.Controller
 	recorder *MockInterfaceMockRecorder
 }
 
-// MockInterfaceMockRecorder is the mock recorder for MockInterface
+// MockInterfaceMockRecorder is the mock recorder for MockInterface.
 type MockInterfaceMockRecorder struct {
 	mock *MockInterface
 }
 
-// NewMockInterface creates a new mock instance
+// NewMockInterface creates a new mock instance.
 func NewMockInterface(ctrl *gomock.Controller) *MockInterface {
 	mock := &MockInterface{ctrl: ctrl}
 	mock.recorder = &MockInterfaceMockRecorder{mock}
 	return mock
 }
 
-// EXPECT returns an object that allows the caller to indicate expected use
+// EXPECT returns an object that allows the caller to indicate expected use.
 func (m *MockInterface) EXPECT() *MockInterfaceMockRecorder {
 	return m.recorder
 }
 
-// Do mocks base method
+// Do mocks base method.
 func (m *MockInterface) Do(arg0 context.Context, arg1 authentication.Input) (*authentication.Output, error) {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "Do", arg0, arg1)
@@ -43,7 +43,7 @@ func (m *MockInterface) Do(arg0 context.Context, arg1 authentication.Input) (*au
 	return ret0, ret1
 }
 
-// Do indicates an expected call of Do
+// Do indicates an expected call of Do.
 func (mr *MockInterfaceMockRecorder) Do(arg0, arg1 interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Do", reflect.TypeOf((*MockInterface)(nil).Do), arg0, arg1)

pkg/usecases/authentication/ropc/ropc.go

@@ -1,4 +1,4 @@
-package authentication
+package ropc
 
 import (
 	"context"
@@ -6,17 +6,26 @@ import (
 	"github.com/int128/kubelogin/pkg/adaptors/logger"
 	"github.com/int128/kubelogin/pkg/adaptors/oidcclient"
 	"github.com/int128/kubelogin/pkg/adaptors/reader"
+	"github.com/int128/kubelogin/pkg/oidc"
 	"golang.org/x/xerrors"
 )
 
+const usernamePrompt = "Username: "
+const passwordPrompt = "Password: "
+
+type Option struct {
+	Username string
+	Password string // If empty, read a password using Reader.ReadPassword()
+}
+
 // ROPC provides the resource owner password credentials flow.
 type ROPC struct {
 	Reader reader.Interface
 	Logger logger.Interface
 }
 
-func (u *ROPC) Do(ctx context.Context, in *ROPCOption, client oidcclient.Interface) (*Output, error) {
-	u.Logger.V(1).Infof("performing the resource owner password credentials flow")
+func (u *ROPC) Do(ctx context.Context, in *Option, client oidcclient.Interface) (*oidc.TokenSet, error) {
+	u.Logger.V(1).Infof("starting the resource owner password credentials flow")
 	if in.Username == "" {
 		var err error
 		in.Username, err = u.Reader.ReadString(usernamePrompt)
@@ -35,9 +44,6 @@ func (u *ROPC) Do(ctx context.Context, in *ROPCOption, client oidcclient.Interfa
 	if err != nil {
 		return nil, xerrors.Errorf("resource owner password credentials flow error: %w", err)
 	}
-	return &Output{
-		IDToken:       tokenSet.IDToken,
-		IDTokenClaims: tokenSet.IDTokenClaims,
-		RefreshToken:  tokenSet.RefreshToken,
-	}, nil
+	u.Logger.V(1).Infof("finished the resource owner password credentials flow")
+	return tokenSet, nil
 }

pkg/usecases/authentication/ropc/ropc_test.go

@@ -1,4 +1,4 @@
-package authentication
+package ropc
 
 import (
 	"context"
@@ -7,10 +7,10 @@ import (
 
 	"github.com/golang/mock/gomock"
 	"github.com/google/go-cmp/cmp"
-	"github.com/int128/kubelogin/pkg/adaptors/oidcclient"
 	"github.com/int128/kubelogin/pkg/adaptors/oidcclient/mock_oidcclient"
 	"github.com/int128/kubelogin/pkg/adaptors/reader/mock_reader"
-	"github.com/int128/kubelogin/pkg/domain/jwt"
+	"github.com/int128/kubelogin/pkg/jwt"
+	"github.com/int128/kubelogin/pkg/oidc"
 	"github.com/int128/kubelogin/pkg/testing/logger"
 	"golang.org/x/xerrors"
 )
@@ -28,11 +28,11 @@ func TestROPC_Do(t *testing.T) {
 		defer ctrl.Finish()
 		ctx, cancel := context.WithTimeout(context.TODO(), timeout)
 		defer cancel()
-		o := &ROPCOption{}
+		o := &Option{}
 		mockOIDCClient := mock_oidcclient.NewMockInterface(ctrl)
 		mockOIDCClient.EXPECT().
 			GetTokenByROPC(gomock.Any(), "USER", "PASS").
-			Return(&oidcclient.TokenSet{
+			Return(&oidc.TokenSet{
 				IDToken:       "YOUR_ID_TOKEN",
 				IDTokenClaims: dummyTokenClaims,
 				RefreshToken:  "YOUR_REFRESH_TOKEN",
@@ -48,7 +48,7 @@ func TestROPC_Do(t *testing.T) {
 		if err != nil {
 			t.Errorf("Do returned error: %+v", err)
 		}
-		want := &Output{
+		want := &oidc.TokenSet{
 			IDToken:       "YOUR_ID_TOKEN",
 			RefreshToken:  "YOUR_REFRESH_TOKEN",
 			IDTokenClaims: dummyTokenClaims,
@@ -63,14 +63,14 @@ func TestROPC_Do(t *testing.T) {
 		defer ctrl.Finish()
 		ctx, cancel := context.WithTimeout(context.TODO(), timeout)
 		defer cancel()
-		o := &ROPCOption{
+		o := &Option{
 			Username: "USER",
 			Password: "PASS",
 		}
 		mockOIDCClient := mock_oidcclient.NewMockInterface(ctrl)
 		mockOIDCClient.EXPECT().
 			GetTokenByROPC(gomock.Any(), "USER", "PASS").
-			Return(&oidcclient.TokenSet{
+			Return(&oidc.TokenSet{
 				IDToken:       "YOUR_ID_TOKEN",
 				RefreshToken:  "YOUR_REFRESH_TOKEN",
 				IDTokenClaims: dummyTokenClaims,
@@ -82,7 +82,7 @@ func TestROPC_Do(t *testing.T) {
 		if err != nil {
 			t.Errorf("Do returned error: %+v", err)
 		}
-		want := &Output{
+		want := &oidc.TokenSet{
 			IDToken:       "YOUR_ID_TOKEN",
 			RefreshToken:  "YOUR_REFRESH_TOKEN",
 			IDTokenClaims: dummyTokenClaims,
@@ -97,13 +97,13 @@ func TestROPC_Do(t *testing.T) {
 		defer ctrl.Finish()
 		ctx, cancel := context.WithTimeout(context.TODO(), timeout)
 		defer cancel()
-		o := &ROPCOption{
+		o := &Option{
 			Username: "USER",
 		}
 		mockOIDCClient := mock_oidcclient.NewMockInterface(ctrl)
 		mockOIDCClient.EXPECT().
 			GetTokenByROPC(gomock.Any(), "USER", "PASS").
-			Return(&oidcclient.TokenSet{
+			Return(&oidc.TokenSet{
 				IDToken:       "YOUR_ID_TOKEN",
 				RefreshToken:  "YOUR_REFRESH_TOKEN",
 				IDTokenClaims: dummyTokenClaims,
@@ -118,7 +118,7 @@ func TestROPC_Do(t *testing.T) {
 		if err != nil {
 			t.Errorf("Do returned error: %+v", err)
 		}
-		want := &Output{
+		want := &oidc.TokenSet{
 			IDToken:       "YOUR_ID_TOKEN",
 			RefreshToken:  "YOUR_REFRESH_TOKEN",
 			IDTokenClaims: dummyTokenClaims,
@@ -133,7 +133,7 @@ func TestROPC_Do(t *testing.T) {
 		defer ctrl.Finish()
 		ctx, cancel := context.WithTimeout(context.TODO(), timeout)
 		defer cancel()
-		o := &ROPCOption{
+		o := &Option{
 			Username: "USER",
 		}
 		mockEnv := mock_reader.NewMockInterface(ctrl)

pkg/usecases/credentialplugin/get_token.go

@@ -54,7 +54,7 @@ func (u *GetToken) Do(ctx context.Context, in Input) error {
 		return xerrors.Errorf("could not get a token: %w", err)
 	}
 	u.Logger.V(1).Infof("writing the token to client-go")
-	if err := u.Writer.Write(credentialpluginwriter.Output{Token: out.IDToken, Expiry: out.IDTokenClaims.Expiry}); err != nil {
+	if err := u.Writer.Write(credentialpluginwriter.Output{Token: out.TokenSet.IDToken, Expiry: out.TokenSet.IDTokenClaims.Expiry}); err != nil {
 		return xerrors.Errorf("could not write the token to client-go: %w", err)
 	}
 	return nil
@@ -101,16 +101,16 @@ func (u *GetToken) getTokenFromCacheOrProvider(ctx context.Context, in Input) (*
 	if err != nil {
 		return nil, xerrors.Errorf("authentication error: %w", err)
 	}
-	u.Logger.V(1).Infof("you got a token: %s", out.IDTokenClaims.Pretty)
+	u.Logger.V(1).Infof("you got a token: %s", out.TokenSet.IDTokenClaims.Pretty)
 	if out.AlreadyHasValidIDToken {
-		u.Logger.V(1).Infof("you already have a valid token until %s", out.IDTokenClaims.Expiry)
+		u.Logger.V(1).Infof("you already have a valid token until %s", out.TokenSet.IDTokenClaims.Expiry)
 		return out, nil
 	}
 
-	u.Logger.V(1).Infof("you got a valid token until %s", out.IDTokenClaims.Expiry)
+	u.Logger.V(1).Infof("you got a valid token until %s", out.TokenSet.IDTokenClaims.Expiry)
 	newTokenCacheValue := tokencache.Value{
-		IDToken:      out.IDToken,
-		RefreshToken: out.RefreshToken,
+		IDToken:      out.TokenSet.IDToken,
+		RefreshToken: out.TokenSet.RefreshToken,
 	}
 	if err := u.TokenCacheRepository.Save(in.TokenCacheDir, tokenCacheKey, newTokenCacheValue); err != nil {
 		return nil, xerrors.Errorf("could not write the token cache: %w", err)

pkg/usecases/credentialplugin/get_token_test.go

@@ -12,7 +12,8 @@ import (
 	"github.com/int128/kubelogin/pkg/adaptors/credentialpluginwriter/mock_credentialpluginwriter"
 	"github.com/int128/kubelogin/pkg/adaptors/tokencache"
 	"github.com/int128/kubelogin/pkg/adaptors/tokencache/mock_tokencache"
-	"github.com/int128/kubelogin/pkg/domain/jwt"
+	"github.com/int128/kubelogin/pkg/jwt"
+	"github.com/int128/kubelogin/pkg/oidc"
 	"github.com/int128/kubelogin/pkg/testing/logger"
 	"github.com/int128/kubelogin/pkg/usecases/authentication"
 	"github.com/int128/kubelogin/pkg/usecases/authentication/mock_authentication"
@@ -57,9 +58,11 @@ func TestGetToken_Do(t *testing.T) {
 				GrantOptionSet: grantOptionSet,
 			}).
 			Return(&authentication.Output{
-				IDToken:       "YOUR_ID_TOKEN",
-				RefreshToken:  "YOUR_REFRESH_TOKEN",
-				IDTokenClaims: dummyTokenClaims,
+				TokenSet: oidc.TokenSet{
+					IDToken:       "YOUR_ID_TOKEN",
+					RefreshToken:  "YOUR_REFRESH_TOKEN",
+					IDTokenClaims: dummyTokenClaims,
+				},
 			}, nil)
 		tokenCacheRepository := mock_tokencache.NewMockInterface(ctrl)
 		tokenCacheRepository.EXPECT().
@@ -127,8 +130,10 @@ func TestGetToken_Do(t *testing.T) {
 			}).
 			Return(&authentication.Output{
 				AlreadyHasValidIDToken: true,
-				IDToken:                "VALID_ID_TOKEN",
-				IDTokenClaims:          dummyTokenClaims,
+				TokenSet: oidc.TokenSet{
+					IDToken:       "VALID_ID_TOKEN",
+					IDTokenClaims: dummyTokenClaims,
+				},
 			}, nil)
 		tokenCacheRepository := mock_tokencache.NewMockInterface(ctrl)
 		tokenCacheRepository.EXPECT().

pkg/usecases/credentialplugin/mock_credentialplugin/mock_credentialplugin.go

@@ -11,30 +11,30 @@ import (
 	reflect "reflect"
 )
 
-// MockInterface is a mock of Interface interface
+// MockInterface is a mock of Interface interface.
 type MockInterface struct {
 	ctrl     *gomock.Controller
 	recorder *MockInterfaceMockRecorder
 }
 
-// MockInterfaceMockRecorder is the mock recorder for MockInterface
+// MockInterfaceMockRecorder is the mock recorder for MockInterface.
 type MockInterfaceMockRecorder struct {
 	mock *MockInterface
 }
 
-// NewMockInterface creates a new mock instance
+// NewMockInterface creates a new mock instance.
 func NewMockInterface(ctrl *gomock.Controller) *MockInterface {
 	mock := &MockInterface{ctrl: ctrl}
 	mock.recorder = &MockInterfaceMockRecorder{mock}
 	return mock
 }
 
-// EXPECT returns an object that allows the caller to indicate expected use
+// EXPECT returns an object that allows the caller to indicate expected use.
 func (m *MockInterface) EXPECT() *MockInterfaceMockRecorder {
 	return m.recorder
 }
 
-// Do mocks base method
+// Do mocks base method.
 func (m *MockInterface) Do(arg0 context.Context, arg1 credentialplugin.Input) error {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "Do", arg0, arg1)
@@ -42,7 +42,7 @@ func (m *MockInterface) Do(arg0 context.Context, arg1 credentialplugin.Input) er
 	return ret0
 }
 
-// Do indicates an expected call of Do
+// Do indicates an expected call of Do.
 func (mr *MockInterfaceMockRecorder) Do(arg0, arg1 interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Do", reflect.TypeOf((*MockInterface)(nil).Do), arg0, arg1)

pkg/usecases/setup/stage2.go

@@ -2,6 +2,7 @@ package setup
 
 import (
 	"context"
+	"path/filepath"
 	"strings"
 	"text/template"
 
@@ -18,19 +19,9 @@ You got a token with the following claims:
 
 ## 3. Bind a cluster role
 
-Apply the following manifest:
+Run the following command:
 
-	kind: ClusterRoleBinding
-	apiVersion: rbac.authorization.k8s.io/v1
-	metadata:
-	  name: oidc-cluster-admin
-	roleRef:
-	  apiGroup: rbac.authorization.k8s.io
-	  kind: ClusterRole
-	  name: cluster-admin
-	subjects:
-	- kind: User
-	  name: {{ .IssuerURL }}#{{ .Subject }}
+	kubectl create clusterrolebinding oidc-cluster-admin --clusterrole=cluster-admin --user='{{ .IssuerURL }}#{{ .Subject }}'
 
 ## 4. Set up the Kubernetes API server
 
@@ -48,8 +39,9 @@ Run the following command:
 	  --exec-command=kubectl \
 	  --exec-arg=oidc-login \
 	  --exec-arg=get-token \
-{{- range .Args }}
-	  --exec-arg={{ . }}
+{{- range $index, $arg := .Args }}
+	  {{- if $index}} \{{end}}
+	  --exec-arg={{ $arg }}
 {{- end }}
 
 ## 6. Verify cluster access
@@ -113,11 +105,11 @@ func (u *Setup) DoStage2(ctx context.Context, in Stage2Input) error {
 	}
 
 	v := stage2Vars{
-		IDTokenPrettyJSON: out.IDTokenClaims.Pretty,
+		IDTokenPrettyJSON: out.TokenSet.IDTokenClaims.Pretty,
 		IssuerURL:         in.IssuerURL,
 		ClientID:          in.ClientID,
 		Args:              makeCredentialPluginArgs(in),
-		Subject:           out.IDTokenClaims.Subject,
+		Subject:           out.TokenSet.IDTokenClaims.Subject,
 	}
 	var b strings.Builder
 	if err := stage2Tpl.Execute(&b, &v); err != nil {
@@ -147,10 +139,24 @@ func makeCredentialPluginArgs(in Stage2Input) []string {
 		args = append(args, "--insecure-skip-tls-verify")
 	}
 
-	if in.GrantOptionSet.AuthCodeOption != nil {
-		if in.GrantOptionSet.AuthCodeOption.SkipOpenBrowser {
+	if in.GrantOptionSet.AuthCodeBrowserOption != nil {
+		if in.GrantOptionSet.AuthCodeBrowserOption.SkipOpenBrowser {
 			args = append(args, "--skip-open-browser")
 		}
+		if in.GrantOptionSet.AuthCodeBrowserOption.LocalServerCertFile != "" {
+			// Resolve the absolute path for the cert files so the user doesn't have to know
+			// to use one when running setup.
+			certpath, err := filepath.Abs(in.GrantOptionSet.AuthCodeBrowserOption.LocalServerCertFile)
+			if err != nil {
+				panic(err)
+			}
+			keypath, err := filepath.Abs(in.GrantOptionSet.AuthCodeBrowserOption.LocalServerKeyFile)
+			if err != nil {
+				panic(err)
+			}
+			args = append(args, "--local-server-cert="+certpath)
+			args = append(args, "--local-server-key="+keypath)
+		}
 	}
 	args = append(args, in.ListenAddressArgs...)
 	if in.GrantOptionSet.ROPCOption != nil {

pkg/usecases/setup/stage2_test.go

@@ -8,7 +8,8 @@ import (
 	"github.com/golang/mock/gomock"
 	"github.com/int128/kubelogin/pkg/adaptors/certpool"
 	"github.com/int128/kubelogin/pkg/adaptors/certpool/mock_certpool"
-	"github.com/int128/kubelogin/pkg/domain/jwt"
+	"github.com/int128/kubelogin/pkg/jwt"
+	"github.com/int128/kubelogin/pkg/oidc"
 	"github.com/int128/kubelogin/pkg/testing/logger"
 	"github.com/int128/kubelogin/pkg/usecases/authentication"
 	"github.com/int128/kubelogin/pkg/usecases/authentication/mock_authentication"
@@ -45,12 +46,14 @@ func TestSetup_DoStage2(t *testing.T) {
 			GrantOptionSet: grantOptionSet,
 		}).
 		Return(&authentication.Output{
-			IDToken:      "YOUR_ID_TOKEN",
-			RefreshToken: "YOUR_REFRESH_TOKEN",
-			IDTokenClaims: jwt.Claims{
-				Subject: "YOUR_SUBJECT",
-				Expiry:  time.Date(2019, 1, 2, 3, 4, 5, 0, time.UTC),
-				Pretty:  "PRETTY_JSON",
+			TokenSet: oidc.TokenSet{
+				IDToken:      "YOUR_ID_TOKEN",
+				RefreshToken: "YOUR_REFRESH_TOKEN",
+				IDTokenClaims: jwt.Claims{
+					Subject: "YOUR_SUBJECT",
+					Expiry:  time.Date(2019, 1, 2, 3, 4, 5, 0, time.UTC),
+					Pretty:  "PRETTY_JSON",
+				},
 			},
 		}, nil)
 	u := Setup{

pkg/usecases/standalone/mock_standalone/mock_standalone.go

@@ -11,30 +11,30 @@ import (
 	reflect "reflect"
 )
 
-// MockInterface is a mock of Interface interface
+// MockInterface is a mock of Interface interface.
 type MockInterface struct {
 	ctrl     *gomock.Controller
 	recorder *MockInterfaceMockRecorder
 }
 
-// MockInterfaceMockRecorder is the mock recorder for MockInterface
+// MockInterfaceMockRecorder is the mock recorder for MockInterface.
 type MockInterfaceMockRecorder struct {
 	mock *MockInterface
 }
 
-// NewMockInterface creates a new mock instance
+// NewMockInterface creates a new mock instance.
 func NewMockInterface(ctrl *gomock.Controller) *MockInterface {
 	mock := &MockInterface{ctrl: ctrl}
 	mock.recorder = &MockInterfaceMockRecorder{mock}
 	return mock
 }
 
-// EXPECT returns an object that allows the caller to indicate expected use
+// EXPECT returns an object that allows the caller to indicate expected use.
 func (m *MockInterface) EXPECT() *MockInterfaceMockRecorder {
 	return m.recorder
 }
 
-// Do mocks base method
+// Do mocks base method.
 func (m *MockInterface) Do(arg0 context.Context, arg1 standalone.Input) error {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "Do", arg0, arg1)
@@ -42,7 +42,7 @@ func (m *MockInterface) Do(arg0 context.Context, arg1 standalone.Input) error {
 	return ret0
 }
 
-// Do indicates an expected call of Do
+// Do indicates an expected call of Do.
 func (mr *MockInterfaceMockRecorder) Do(arg0, arg1 interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Do", reflect.TypeOf((*MockInterface)(nil).Do), arg0, arg1)

pkg/usecases/standalone/standalone.go

@@ -2,8 +2,6 @@ package standalone
 
 import (
 	"context"
-	"strings"
-	"text/template"
 
 	"github.com/google/wire"
 	"github.com/int128/kubelogin/pkg/adaptors/certpool"
@@ -30,12 +28,23 @@ type Input struct {
 	KubeconfigFilename string                 // Default to the environment variable or global config as kubectl
 	KubeconfigContext  kubeconfig.ContextName // Default to the current context but ignored if KubeconfigUser is set
 	KubeconfigUser     kubeconfig.UserName    // Default to the user of the context
-	CACertFilename     string                 // If set, use the CA cert
+	CACertFilename     string                 // optional
+	CACertData         string                 // optional
 	SkipTLSVerify      bool
 	GrantOptionSet     authentication.GrantOptionSet
 }
 
-const oidcConfigErrorMessage = `You need to set up the kubeconfig for OpenID Connect authentication.
+const oidcConfigErrorMessage = `No configuration found.
+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.
+`
+
+const deprecationMessage = `NOTE: You can use the credential plugin mode for better user experience.
+Kubectl automatically runs kubelogin and you do not need to run kubelogin explicitly.
 See https://github.com/int128/kubelogin for more.
 `
 
@@ -60,9 +69,7 @@ func (u *Standalone) Do(ctx context.Context, in Input) error {
 		u.Logger.Printf(oidcConfigErrorMessage)
 		return xerrors.Errorf("could not find the current authentication provider: %w", err)
 	}
-	if err := u.showDeprecation(in, authProvider); err != nil {
-		return xerrors.Errorf("could not show deprecation message: %w", err)
-	}
+	u.Logger.Printf(deprecationMessage)
 	u.Logger.V(1).Infof("using the authentication provider of the user %s", authProvider.UserName)
 	u.Logger.V(1).Infof("a token will be written to %s", authProvider.LocationOfOrigin)
 	certPool := u.NewCertPool()
@@ -78,7 +85,12 @@ func (u *Standalone) Do(ctx context.Context, in Input) error {
 	}
 	if in.CACertFilename != "" {
 		if err := certPool.AddFile(in.CACertFilename); err != nil {
-			return xerrors.Errorf("could not load the certificate: %w", err)
+			return xerrors.Errorf("could not load the certificate file: %w", err)
+		}
+	}
+	if in.CACertData != "" {
+		if err := certPool.AddBase64Encoded(in.CACertData); err != nil {
+			return xerrors.Errorf("could not load the certificate data: %w", err)
 		}
 	}
 	out, err := u.Authentication.Do(ctx, authentication.Input{
@@ -95,79 +107,18 @@ func (u *Standalone) Do(ctx context.Context, in Input) error {
 	if err != nil {
 		return xerrors.Errorf("authentication error: %w", err)
 	}
-	u.Logger.V(1).Infof("you got a token: %s", out.IDTokenClaims.Pretty)
+	u.Logger.V(1).Infof("you got a token: %s", out.TokenSet.IDTokenClaims.Pretty)
 	if out.AlreadyHasValidIDToken {
-		u.Logger.Printf("You already have a valid token until %s", out.IDTokenClaims.Expiry)
+		u.Logger.Printf("You already have a valid token until %s", out.TokenSet.IDTokenClaims.Expiry)
 		return nil
 	}
 
-	u.Logger.Printf("You got a valid token until %s", out.IDTokenClaims.Expiry)
-	authProvider.IDToken = out.IDToken
-	authProvider.RefreshToken = out.RefreshToken
+	u.Logger.Printf("You got a valid token until %s", out.TokenSet.IDTokenClaims.Expiry)
+	authProvider.IDToken = out.TokenSet.IDToken
+	authProvider.RefreshToken = out.TokenSet.RefreshToken
 	u.Logger.V(1).Infof("writing the ID token and refresh token to %s", authProvider.LocationOfOrigin)
 	if err := u.Kubeconfig.UpdateAuthProvider(authProvider); err != nil {
 		return xerrors.Errorf("could not update the kubeconfig: %w", err)
 	}
 	return nil
 }
-
-var deprecationTpl = template.Must(template.New("").Parse(
-	`IMPORTANT NOTICE:
-The credential plugin mode is available since v1.14.0.
-Kubectl will automatically run kubelogin and you do not need to run kubelogin explicitly.
-
-You can switch to the credential plugin mode by the following command:
-
-	kubectl config set-credentials oidc \
-	  --exec-api-version=client.authentication.k8s.io/v1beta1 \
-	  --exec-command=kubectl \
-	  --exec-arg=oidc-login \
-	  --exec-arg=get-token \
-{{- range .Args }}
-	  --exec-arg={{ . }}
-{{- end }}
-	kubectl config set-context --current --user=oidc
-
-See https://github.com/int128/kubelogin for more.
-
-`))
-
-type deprecationVars struct {
-	Args []string
-}
-
-func (u *Standalone) showDeprecation(in Input, p *kubeconfig.AuthProvider) error {
-	var args []string
-	args = append(args, "--oidc-issuer-url="+p.IDPIssuerURL)
-	args = append(args, "--oidc-client-id="+p.ClientID)
-	if p.ClientSecret != "" {
-		args = append(args, "--oidc-client-secret="+p.ClientSecret)
-	}
-	for _, extraScope := range p.ExtraScopes {
-		args = append(args, "--oidc-extra-scope="+extraScope)
-	}
-	if p.IDPCertificateAuthority != "" {
-		args = append(args, "--certificate-authority="+p.IDPCertificateAuthority)
-	}
-	if p.IDPCertificateAuthorityData != "" {
-		args = append(args, "--certificate-authority-data="+p.IDPCertificateAuthorityData)
-	}
-	if in.CACertFilename != "" {
-		args = append(args, "--certificate-authority="+in.CACertFilename)
-	}
-	if in.GrantOptionSet.ROPCOption != nil {
-		if in.GrantOptionSet.ROPCOption.Username != "" {
-			args = append(args, "--username="+in.GrantOptionSet.ROPCOption.Username)
-		}
-	}
-
-	v := deprecationVars{
-		Args: args,
-	}
-	var b strings.Builder
-	if err := deprecationTpl.Execute(&b, &v); err != nil {
-		return xerrors.Errorf("template error: %w", err)
-	}
-	u.Logger.Printf("%s", b.String())
-	return nil
-}

pkg/usecases/standalone/standalone_test.go

@@ -10,7 +10,8 @@ import (
 	"github.com/int128/kubelogin/pkg/adaptors/certpool/mock_certpool"
 	"github.com/int128/kubelogin/pkg/adaptors/kubeconfig"
 	"github.com/int128/kubelogin/pkg/adaptors/kubeconfig/mock_kubeconfig"
-	"github.com/int128/kubelogin/pkg/domain/jwt"
+	"github.com/int128/kubelogin/pkg/jwt"
+	"github.com/int128/kubelogin/pkg/oidc"
 	"github.com/int128/kubelogin/pkg/testing/logger"
 	"github.com/int128/kubelogin/pkg/usecases/authentication"
 	"github.com/int128/kubelogin/pkg/usecases/authentication/mock_authentication"
@@ -34,6 +35,7 @@ func TestStandalone_Do(t *testing.T) {
 			KubeconfigContext:  "theContext",
 			KubeconfigUser:     "theUser",
 			CACertFilename:     "/path/to/cert1",
+			CACertData:         "BASE64ENCODED1",
 			SkipTLSVerify:      true,
 			GrantOptionSet:     grantOptionSet,
 		}
@@ -44,7 +46,7 @@ func TestStandalone_Do(t *testing.T) {
 			ClientID:                    "YOUR_CLIENT_ID",
 			ClientSecret:                "YOUR_CLIENT_SECRET",
 			IDPCertificateAuthority:     "/path/to/cert2",
-			IDPCertificateAuthorityData: "BASE64ENCODED",
+			IDPCertificateAuthorityData: "BASE64ENCODED2",
 		}
 		mockCertPool := mock_certpool.NewMockInterface(ctrl)
 		mockCertPool.EXPECT().
@@ -52,7 +54,9 @@ func TestStandalone_Do(t *testing.T) {
 		mockCertPool.EXPECT().
 			AddFile("/path/to/cert2")
 		mockCertPool.EXPECT().
-			AddBase64Encoded("BASE64ENCODED")
+			AddBase64Encoded("BASE64ENCODED1")
+		mockCertPool.EXPECT().
+			AddBase64Encoded("BASE64ENCODED2")
 		mockKubeconfig := mock_kubeconfig.NewMockInterface(ctrl)
 		mockKubeconfig.EXPECT().
 			GetCurrentAuthProvider("/path/to/kubeconfig", kubeconfig.ContextName("theContext"), kubeconfig.UserName("theUser")).
@@ -65,7 +69,7 @@ func TestStandalone_Do(t *testing.T) {
 				ClientID:                    "YOUR_CLIENT_ID",
 				ClientSecret:                "YOUR_CLIENT_SECRET",
 				IDPCertificateAuthority:     "/path/to/cert2",
-				IDPCertificateAuthorityData: "BASE64ENCODED",
+				IDPCertificateAuthorityData: "BASE64ENCODED2",
 				IDToken:                     "YOUR_ID_TOKEN",
 				RefreshToken:                "YOUR_REFRESH_TOKEN",
 			})
@@ -80,9 +84,11 @@ func TestStandalone_Do(t *testing.T) {
 				GrantOptionSet: grantOptionSet,
 			}).
 			Return(&authentication.Output{
-				IDToken:       "YOUR_ID_TOKEN",
-				RefreshToken:  "YOUR_REFRESH_TOKEN",
-				IDTokenClaims: dummyTokenClaims,
+				TokenSet: oidc.TokenSet{
+					IDToken:       "YOUR_ID_TOKEN",
+					RefreshToken:  "YOUR_REFRESH_TOKEN",
+					IDTokenClaims: dummyTokenClaims,
+				},
 			}, nil)
 		u := Standalone{
 			Authentication: mockAuthentication,
@@ -124,8 +130,10 @@ func TestStandalone_Do(t *testing.T) {
 			}).
 			Return(&authentication.Output{
 				AlreadyHasValidIDToken: true,
-				IDToken:                "VALID_ID_TOKEN",
-				IDTokenClaims:          dummyTokenClaims,
+				TokenSet: oidc.TokenSet{
+					IDToken:       "VALID_ID_TOKEN",
+					IDTokenClaims: dummyTokenClaims,
+				},
 			}, nil)
 		u := Standalone{
 			Authentication: mockAuthentication,
@@ -232,9 +240,11 @@ func TestStandalone_Do(t *testing.T) {
 				CertPool:     mockCertPool,
 			}).
 			Return(&authentication.Output{
-				IDToken:       "YOUR_ID_TOKEN",
-				RefreshToken:  "YOUR_REFRESH_TOKEN",
-				IDTokenClaims: dummyTokenClaims,
+				TokenSet: oidc.TokenSet{
+					IDToken:       "YOUR_ID_TOKEN",
+					RefreshToken:  "YOUR_REFRESH_TOKEN",
+					IDTokenClaims: dummyTokenClaims,
+				},
 			}, nil)
 		u := Standalone{
 			Authentication: mockAuthentication,

snapcraft.yaml

@@ -1,19 +0,0 @@
-name: kubelogin
-version: git
-summary: Log in to the OpenID Connect provider
-description: |
-  This is a kubectl plugin for Kubernetes OpenID Connect (OIDC) authentication.
-confinement: strict
-base: core18
-parts:
-  kubelogin:
-    plugin: nil
-    source: .
-    source-type: git
-    build-snaps: [go]
-    override-build: |
-      make CIRCLE_TAG=$SNAPCRAFT_PROJECT_VERSION
-      cp -av kubelogin $SNAPCRAFT_PART_INSTALL/bin
-apps:
-  kubelogin:
-    command: bin/kubelogin

system_test/.gitignore

@@ -0,0 +1,6 @@
+/bin/
+
+/cert/ca.*
+/cert/server.*
+
+/cluster/kubeconfig.yaml