Revise setup instruction (#235)

Bumps [github.com/coreos/go-oidc](https://github.com/coreos/go-oidc) from 2.1.0+incompatible to 2.2.1+incompatible.
- [Release notes](https://github.com/coreos/go-oidc/releases)
- [Commits](https://github.com/coreos/go-oidc/compare/v2.1.0...v2.2.1)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

.circleci/config.yml

@@ -2,30 +2,19 @@ version: 2
 jobs:
   build:
     docker:
-      - image: circleci/golang:1.12.3
+      - image: circleci/golang:1.13.4
     steps:
-      - run: |
-          mkdir -p ~/bin
-          echo 'export PATH="$HOME/bin:$PATH"' >> $BASH_ENV
-      - run: |
-          curl -L -o ~/bin/kubectl https://storage.googleapis.com/kubernetes-release/release/v1.14.0/bin/linux/amd64/kubectl
-          chmod +x ~/bin/kubectl
-      - run: |
-          curl -L -o ~/bin/ghcp https://github.com/int128/ghcp/releases/download/v1.3.0/ghcp_linux_amd64
-          chmod +x ~/bin/ghcp
-      - run: |
-          curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | sh -s -- -b ~/bin v1.16.0
-      - run: go get github.com/int128/goxzst
-      - run: go get github.com/tcnksm/ghr
+      - run: mkdir -p ~/bin
+      - run: echo 'export PATH="$HOME/bin:$PATH"' >> $BASH_ENV
       - checkout
-      # workaround for https://github.com/golang/go/issues/27925
-      - run: sed -e '/^k8s.io\/client-go /d' -i go.sum
-      - run: make check
-      - run: make run
+      - run: make ci-setup-linux-amd64
+      - run: make VERSION=$CIRCLE_TAG ci
       - run: |
           if [ "$CIRCLE_TAG" ]; then
-            make release
+            make VERSION=$CIRCLE_TAG GITHUB_USERNAME=$CIRCLE_PROJECT_USERNAME GITHUB_REPONAME=$CIRCLE_PROJECT_REPONAME release
           fi
+      - store_artifacts:
+          path: gotest.log
 
 workflows:
   version: 2

.github/FUNDING.yml

@@ -0,0 +1,12 @@
+# These are supported funding model platforms
+
+github: [int128] # Replace with up to 4 GitHub Sponsors-enabled usernames e.g., [user1, user2]
+patreon: # Replace with a single Patreon username
+open_collective: # Replace with a single Open Collective username
+ko_fi: # Replace with a single Ko-fi username
+tidelift: # Replace with a single Tidelift platform-name/package-name e.g., npm/babel
+community_bridge: # Replace with a single Community Bridge project-name e.g., cloud-foundry
+liberapay: # Replace with a single Liberapay username
+issuehunt: # Replace with a single IssueHunt username
+otechie: # Replace with a single Otechie username
+custom: # Replace with up to 4 custom sponsorship URLs e.g., ['link1', 'link2']

.github/workflows/acceptance-test.yaml

@@ -0,0 +1,30 @@
+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

.gitignore

@@ -1,5 +1,10 @@
 /.idea
-/dist
+
+/acceptance_test/output/
+
+/dist/output
+/coverage.out
+/gotest.log
+
 /kubelogin
 /kubectl-oidc_login
-/.kubeconfig*

Makefile

@@ -1,35 +1,66 @@
-TARGET := kubelogin
-TARGET_PLUGIN := kubectl-oidc_login
-CIRCLE_TAG ?= HEAD
-LDFLAGS := -X main.version=$(CIRCLE_TAG)
+# CI must provide the following variables (on tag push)
+# VERSION
+# GITHUB_USERNAME
+# GITHUB_REPONAME
 
-.PHONY: check run release clean
+TARGET := kubelogin
+VERSION ?= latest
+LDFLAGS := -X main.version=$(VERSION)
 
 all: $(TARGET)
 
-check:
-	golangci-lint run
-	$(MAKE) -C adaptors_test/keys/testdata
-	go test -v -race ./...
-
-$(TARGET): $(wildcard *.go)
+$(TARGET): $(wildcard **/*.go)
 	go build -o $@ -ldflags "$(LDFLAGS)"
 
-$(TARGET_PLUGIN): $(TARGET)
-	ln -sf $(TARGET) $@
+.PHONY: ci
+ci:
+	$(MAKE) check
+	bash -c "bash <(curl -s https://codecov.io/bash)"
+	$(MAKE) dist
 
-run: $(TARGET_PLUGIN)
-	-PATH=.:$(PATH) kubectl oidc-login --help
+.PHONY: check
+check:
+	golangci-lint run
+	go test -v -race -cover -coverprofile=coverage.out ./... > gotest.log
 
-dist:
-	VERSION=$(CIRCLE_TAG) goxzst -d dist/gh/ -o "$(TARGET)" -t "kubelogin.rb oidc-login.yaml" -- -ldflags "$(LDFLAGS)"
-	mv dist/gh/kubelogin.rb dist/
+.PHONY: dist
+dist: dist/output
+dist/output:
+	# make the zip files for GitHub Releases
+	VERSION=$(VERSION) CGO_ENABLED=0 goxzst -d dist/output -i "LICENSE" -o "$(TARGET)" -t "dist/kubelogin.rb dist/oidc-login.yaml dist/Dockerfile" -- -ldflags "$(LDFLAGS)"
+	# test the zip file
+	zipinfo dist/output/kubelogin_linux_amd64.zip
+	# make the krew yaml structure
+	mkdir -p dist/output/plugins
+	mv dist/output/oidc-login.yaml dist/output/plugins/oidc-login.yaml
 
+.PHONY: release
 release: dist
-	ghr -u "$(CIRCLE_PROJECT_USERNAME)" -r "$(CIRCLE_PROJECT_REPONAME)" "$(CIRCLE_TAG)" dist/gh/
-	ghcp -u "$(CIRCLE_PROJECT_USERNAME)" -r "homebrew-$(CIRCLE_PROJECT_REPONAME)" -m "$(CIRCLE_TAG)" -C dist/ kubelogin.rb
+	# publish the binaries
+	ghcp release -u "$(GITHUB_USERNAME)" -r "$(GITHUB_REPONAME)" -t "$(VERSION)" dist/output/
+	# publish the Homebrew formula
+	ghcp commit -u "$(GITHUB_USERNAME)" -r "homebrew-$(GITHUB_REPONAME)" -b "bump-$(VERSION)" -m "Bump the version to $(VERSION)" -C dist/output/ kubelogin.rb
+	ghcp pull-request -u "$(GITHUB_USERNAME)" -r "homebrew-$(GITHUB_REPONAME)" -b "bump-$(VERSION)" --title "Bump the version to $(VERSION)"
+	# publish the Dockerfile
+	ghcp commit -u "$(GITHUB_USERNAME)" -r "$(GITHUB_REPONAME)-docker" -b "bump-$(VERSION)" -m "Bump the version to $(VERSION)" -C dist/output/ Dockerfile
+	ghcp pull-request -u "$(GITHUB_USERNAME)" -r "$(GITHUB_REPONAME)-docker" -b "bump-$(VERSION)" --title "Bump the version to $(VERSION)"
+	# publish the Krew manifest
+	ghcp fork-commit -u kubernetes-sigs -r krew-index -b "oidc-login-$(VERSION)" -m "Bump oidc-login to $(VERSION)" -C dist/output/ plugins/oidc-login.yaml
 
+.PHONY: clean
 clean:
 	-rm $(TARGET)
-	-rm $(TARGET_PLUGIN)
-	-rm -r dist/
+	-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

@@ -1,160 +1,312 @@
-# kubelogin [![CircleCI](https://circleci.com/gh/int128/kubelogin.svg?style=shield)](https://circleci.com/gh/int128/kubelogin)
+# 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)
 
-This is a kubectl plugin for [Kubernetes OpenID Connect (OIDC) authentication](https://kubernetes.io/docs/reference/access-authn-authz/authentication/#openid-connect-tokens).
-It updates the kubeconfig file with an ID token and refresh token got from the OIDC provider.
+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">
+
+Kubelogin is designed to run as a [client-go credential plugin](https://kubernetes.io/docs/reference/access-authn-authz/authentication/#client-go-credential-plugins).
+When you run kubectl, kubelogin opens the browser and you can log in to the provider.
+Then kubelogin gets a token from the provider and kubectl access Kubernetes APIs with the token.
+Take a look at the diagram:
+
+![Diagram of the credential plugin](docs/credential-plugin-diagram.svg)
 
 
 ## Getting Started
 
-You need to setup the following components:
+### Setup
 
-- OIDC provider
-- Kubernetes API server
-- Role for your group or user
-- kubectl authentication
-
-You can install the latest release from [Homebrew](https://brew.sh/), [Krew](https://github.com/kubernetes-sigs/krew) or [GitHub Releases](https://github.com/int128/kubelogin/releases) as follows:
+Install the latest release from [Homebrew](https://brew.sh/), [Krew](https://github.com/kubernetes-sigs/krew) or [GitHub Releases](https://github.com/int128/kubelogin/releases) as follows:
 
 ```sh
 # Homebrew
-brew tap int128/kubelogin
-brew install kubelogin
+brew install int128/kubelogin/kubelogin
 
 # Krew
 kubectl krew install oidc-login
 
 # GitHub Releases
-curl -LO https://github.com/int128/kubelogin/releases/download/v1.11.0/kubelogin_linux_amd64.zip
+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
 ```
 
-After initial setup or when the token has been expired, just run:
+You need to set up the OIDC provider, cluster role binding, Kubernetes API server and kubeconfig.
+The kubeconfig looks like:
+
+```yaml
+users:
+- name: oidc
+  user:
+    exec:
+      apiVersion: client.authentication.k8s.io/v1beta1
+      command: kubectl
+      args:
+      - oidc-login
+      - get-token
+      - --oidc-issuer-url=ISSUER_URL
+      - --oidc-client-id=YOUR_CLIENT_ID
+      - --oidc-client-secret=YOUR_CLIENT_SECRET
+```
+
+See [the setup guide](docs/setup.md) for more.
+
+
+### Run
+
+Run kubectl.
+
+```sh
+kubectl get pods
+```
+
+Kubectl executes kubelogin before calling the Kubernetes APIs.
+Kubelogin automatically opens the browser and you can log in to the provider.
+
+<img src="docs/keycloak-login.png" alt="keycloak-login" width="455" height="329">
+
+After authentication, kubelogin returns the credentials to kubectl and finally kubectl calls the Kubernetes APIs with the credential.
 
 ```
-% kubelogin
+% kubectl get pods
 Open http://localhost:8000 for authentication
-You got a valid token until 2019-05-16 22:03:13 +0900 JST
-Updated ~/.kubeconfig
+NAME                          READY   STATUS    RESTARTS   AGE
+echoserver-86c78fdccd-nzmd5   1/1     Running   0          26d
 ```
 
-or run as a kubectl plugin:
+Kubelogin writes the ID token and refresh token to the token cache file.
+
+If the cached ID token is valid, kubelogin just returns it.
+If the cached ID token has expired, kubelogin will refresh the token using the refresh token.
+If the refresh token has expired, kubelogin will perform reauthentication.
+
+
+### Troubleshoot
+
+You can log out by removing the token cache directory (default `~/.kube/cache/oidc-login`).
+Kubelogin will perform authentication if the token cache file does not exist.
+
+You can dump the claims of token by passing `-v1` option.
 
 ```
-% kubectl oidc-login
+I1212 10:14:17.754394    2517 get_token.go:91] the ID token has the claim: sub=********
+I1212 10:14:17.754434    2517 get_token.go:91] the ID token has the claim: at_hash=********
+I1212 10:14:17.754449    2517 get_token.go:91] the ID token has the claim: nonce=********
+I1212 10:14:17.754459    2517 get_token.go:91] the ID token has the claim: iat=1576113256
+I1212 10:14:17.754467    2517 get_token.go:91] the ID token has the claim: exp=1576116856
+I1212 10:14:17.754484    2517 get_token.go:91] the ID token has the claim: iss=https://accounts.google.com
+I1212 10:14:17.754497    2517 get_token.go:91] the ID token has the claim: azp=********.apps.googleusercontent.com
+I1212 10:14:17.754506    2517 get_token.go:91] the ID token has the claim: aud=********.apps.googleusercontent.com
 ```
 
-It opens the browser and you can log in to the provider.
-After authentication, it gets an ID token and refresh token and writes them to the kubeconfig.
 
-For more, see the following documents:
-
-- [Getting Started with Keycloak](docs/keycloak.md)
-- [Getting Started with Google Identity Platform](docs/google.md)
-- [Team Operation](docs/team_ops.md)
-
-If you are using other platforms, please contribute documents via pull requests.
-
-
-## Configuration
+## Usage
 
 This document is for the development version.
 If you are looking for a specific version, see [the release tags](https://github.com/int128/kubelogin/tags).
 
-Kubelogin supports the following options.
+Kubelogin supports the following options:
 
 ```
-Options:
-      --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
-      --listen-port ints               Port to bind to the local server. If multiple ports are given, it will try the ports in order (default [8000,18000])
-      --skip-open-browser              If true, it does not open the browser on authentication
-      --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
-  -v, --v int                          If set to 1 or greater, it shows debug log
+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
 ```
 
-It supports the following keys of `auth-provider` in a kubeconfig.
-See [kubectl authentication](https://kubernetes.io/docs/reference/access-authn-authz/authentication/#using-kubectl) for more.
-
-Key | Direction | Value
-----|-----------|------
-`idp-issuer-url`                  | Read (Mandatory) | Issuer URL of the provider.
-`client-id`                       | Read (Mandatory) | Client ID of the provider.
-`client-secret`                   | Read (Mandatory) | Client Secret of the provider.
-`idp-certificate-authority`       | Read | CA certificate path of the provider.
-`idp-certificate-authority-data`  | Read | Base64 encoded CA certificate of the provider.
-`extra-scopes`                    | Read | Scopes to request to the provider (comma separated).
-`id-token`                        | Write | ID token got from the provider.
-`refresh-token`                   | Write | Refresh token got from the provider.
-
-
-### Kubeconfig
-
-You can set path to the kubeconfig file by the option or the environment variable just like kubectl.
-It defaults to `~/.kube/config`.
-
-```sh
-# by the option
-kubelogin --kubeconfig /path/to/kubeconfig
-
-# by the environment variable
-KUBECONFIG="/path/to/kubeconfig1:/path/to/kubeconfig2" kubelogin
-```
-
-If you set multiple files, kubelogin will find the file which has the current authentication (i.e. `user` and `auth-provider`) and write a token to it.
-
+See also the options of [standalone mode](docs/standalone-mode.md).
 
 ### Extra scopes
 
-You can set extra scopes to request to the provider by `extra-scopes` in the kubeconfig.
+You can set the extra scopes to request to the provider by `--oidc-extra-scope`.
 
-```sh
-kubectl config set-credentials keycloak --auth-provider-arg extra-scopes=email
+```yaml
+      - --oidc-extra-scope=email
+      - --oidc-extra-scope=profile
 ```
 
-Note that kubectl does not accept multiple scopes and you need to edit the kubeconfig as like:
+### CA Certificate
 
-```sh
-kubectl config set-credentials keycloak --auth-provider-arg extra-scopes=SCOPES
-sed -i '' -e s/SCOPES/email,profile/ $KUBECONFIG
+You can use your self-signed certificate for the provider.
+
+```yaml
+      - --certificate-authority=/home/user/.kube/keycloak-ca.pem
+      - --certificate-authority-data=LS0t...
 ```
 
-
-### Redirect URIs
-
-By default kubelogin starts the local server at port 8000 or 18000.
-You need to register the following redirect URIs to the OIDC provider:
-
-- `http://localhost:8000`
-- `http://localhost:18000` (used if port 8000 is already in use)
-
-You can change the ports by the option:
-
-```sh
-kubelogin --listen-port 12345 --listen-port 23456
-```
-
-
-### CA Certificates
-
-You can set your self-signed certificates for the OIDC provider (not Kubernetes API server) by kubeconfig or option.
-
-```sh
-kubectl config set-credentials keycloak \
-  --auth-provider-arg idp-certificate-authority=$HOME/.kube/keycloak-ca.pem
-```
-
-
 ### 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:
+```
+
+
+## Related works
+
+### Kubernetes Dashboard
+
+You can access the Kubernetes Dashboard using kubelogin and [kauthproxy](https://github.com/int128/kauthproxy).
+
 
 ## Contributions
 
 This is an open source software licensed under Apache License 2.0.
-
 Feel free to open issues and pull requests for improving code and documents.
+
+### Development
+
+Go 1.13 or later is required.
+
+```sh
+# Run lint and tests
+make check
+
+# Compile and run the command
+make
+./kubelogin
+```
+
+See also [the acceptance test](acceptance_test).

acceptance_test/Makefile

@@ -0,0 +1,108 @@
+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
+
+# clean up the resources
+.PHONY: clean
+clean:
+	-rm -r $(OUTPUT_DIR)
+.PHONY: delete-cluster
+delete-cluster:
+	kind delete cluster --name $(CLUSTER_NAME)
+.PHONY: delete-dex
+delete-dex:
+	docker stop dex-server
+	docker rm dex-server

acceptance_test/README.md

@@ -0,0 +1,91 @@
+# 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.
+
+
+## Technical consideration
+
+### Network and DNS
+
+Consider the following issues:
+
+- kube-apiserver runs on the host network of the kind container.
+- kube-apiserver cannot resolve a service name by kube-dns.
+- kube-apiserver cannot access a cluster IP.
+- kube-apiserver can access another container via the Docker network.
+- Chrome requires exactly match of domain name between Dex URL and a server certificate.
+
+Consequently,
+
+- kube-apiserver accesses Dex by resolving `/etc/hosts` and via the Docker network.
+- kubelogin and Chrome accesses Dex by resolving `/etc/hosts` and via the Docker network.
+
+### TLS server certificate
+
+Consider the following issues:
+
+- kube-apiserver requires `--oidc-issuer` is HTTPS URL.
+- kube-apiserver requires a CA certificate at startup, if `--oidc-ca-file` is given.
+- kube-apiserver mounts `/usr/local/share/ca-certificates` from the kind container.
+- It is possible to mount a file from the CI machine.
+- It is not possible to issue a certificate using Let's Encrypt in runtime.
+- Chrome requires a valid certificate in `~/.pki/nssdb`.
+
+As a result,
+
+- kube-apiserver uses the CA certificate of `/usr/local/share/ca-certificates/dex-ca.crt`. See the `extraMounts` section of [`cluster.yaml`](cluster.yaml).
+- kubelogin uses the CA certificate in `output/ca.crt`.
+- Chrome uses the CA certificate in `~/.pki/nssdb`.
+
+### Test environment
+
+- Set the issuer URL to 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`.
+
+
+## Run locally
+
+You need to set up Docker and Kind.
+
+You need to add the following line to `/etc/hosts`:
+
+```
+127.0.0.1 dex-server
+```
+
+Run:
+
+```shell script
+# run the test
+make
+
+# clean up
+make delete-cluster
+make delete-dex
+```

acceptance_test/chromelogin/main.go

@@ -0,0 +1,93 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"os"
+	"strings"
+	"time"
+
+	"github.com/chromedp/chromedp"
+)
+
+func init() {
+	log.SetFlags(log.Lmicroseconds | log.Lshortfile)
+}
+
+func main() {
+	if len(os.Args) != 2 {
+		log.Fatalf("usage: %s URL", os.Args[0])
+		return
+	}
+	url := os.Args[1]
+	if err := runBrowser(context.Background(), url); err != nil {
+		log.Fatalf("error: %s", err)
+	}
+}
+
+func runBrowser(ctx context.Context, url string) error {
+	execOpts := chromedp.DefaultExecAllocatorOptions[:]
+	execOpts = append(execOpts, chromedp.NoSandbox)
+	ctx, cancel := chromedp.NewExecAllocator(ctx, execOpts...)
+	defer cancel()
+	ctx, cancel = chromedp.NewContext(ctx, chromedp.WithLogf(log.Printf))
+	defer cancel()
+	ctx, cancel = context.WithTimeout(ctx, 30*time.Second)
+	defer cancel()
+	if err := logInToDex(ctx, url); err != nil {
+		return fmt.Errorf("could not run the browser: %w", err)
+	}
+	return nil
+}
+
+func logInToDex(ctx context.Context, url string) error {
+	for {
+		var location string
+		err := chromedp.Run(ctx,
+			chromedp.Navigate(url),
+			chromedp.Location(&location),
+		)
+		if err != nil {
+			return err
+		}
+		log.Printf("location: %s", location)
+		if strings.HasPrefix(location, `http://`) || strings.HasPrefix(location, `https://`) {
+			break
+		}
+		time.Sleep(1 * time.Second)
+	}
+
+	err := chromedp.Run(ctx,
+		// https://dex-server:10443/dex/auth/local
+		chromedp.WaitVisible(`#login`),
+		logPageMetadata(),
+		chromedp.SendKeys(`#login`, `admin@example.com`),
+		chromedp.SendKeys(`#password`, `password`),
+		chromedp.Submit(`#submit-login`),
+		// https://dex-server:10443/dex/approval
+		chromedp.WaitVisible(`.dex-btn.theme-btn--success`),
+		logPageMetadata(),
+		chromedp.Submit(`.dex-btn.theme-btn--success`),
+		// http://localhost:8000
+		chromedp.WaitReady(`body`),
+		logPageMetadata(),
+	)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func logPageMetadata() chromedp.Action {
+	var location string
+	var title string
+	return chromedp.Tasks{
+		chromedp.Location(&location),
+		chromedp.Title(&title),
+		chromedp.ActionFunc(func(ctx context.Context) error {
+			log.Printf("location: %s [%s]", location, title)
+			return nil
+		}),
+	}
+}

acceptance_test/cluster.yaml

@@ -0,0 +1,20 @@
+kind: Cluster
+apiVersion: kind.x-k8s.io/v1alpha4
+# https://github.com/dexidp/dex/blob/master/Documentation/kubernetes.md
+kubeadmConfigPatches:
+  - |
+    apiVersion: kubeadm.k8s.io/v1beta2
+    kind: ClusterConfiguration
+    metadata:
+      name: config
+    apiServer:
+      extraArgs:
+        oidc-issuer-url: https://dex-server:10443/dex
+        oidc-client-id: YOUR_CLIENT_ID
+        oidc-username-claim: email
+        oidc-ca-file: /usr/local/share/ca-certificates/dex-ca.crt
+nodes:
+  - role: control-plane
+    extraMounts:
+      - hostPath: /tmp/kubelogin-acceptance-test-dex-ca.crt
+        containerPath: /usr/local/share/ca-certificates/dex-ca.crt

acceptance_test/dex.yaml

@@ -0,0 +1,23 @@
+issuer: https://dex-server:10443/dex
+web:
+  https: 0.0.0.0:10443
+  tlsCert: /server.crt
+  tlsKey: /server.key
+storage:
+  type: sqlite3
+  config:
+    file: /tmp/dex.db
+staticClients:
+  - id: YOUR_CLIENT_ID
+    redirectURIs:
+      - http://localhost:8000
+    name: kubelogin
+    secret: YOUR_CLIENT_SECRET
+staticPasswords:
+  - email: "admin@example.com"
+    # bcrypt hash of the string "password"
+    hash: "$2a$10$2b2cU8CPhOTaGrs1HRQuAueS7JTT5ZHsHSzYiFPm1leZck7Mc8T4W"
+    username: "admin"
+    userID: "08a8684b-db88-4b73-90a9-3cd1661f5466"
+# required for staticPasswords
+enablePasswordDB: true

acceptance_test/openssl.cnf

@@ -0,0 +1,15 @@
+[ req ]
+distinguished_name = req_distinguished_name
+req_extensions = v3_req
+
+[ req_distinguished_name ]
+
+[ v3_req ]
+basicConstraints = CA:FALSE
+keyUsage = nonRepudiation, digitalSignature, keyEncipherment
+subjectAltName = @alt_names
+extendedKeyUsage = serverAuth
+
+[alt_names]
+DNS.1 = dex-server
+DNS.2 = dex-server:30443

acceptance_test/role.yaml

@@ -0,0 +1,21 @@
+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

adaptors/cmd.go

@@ -1,100 +0,0 @@
-package adaptors
-
-import (
-	"context"
-	"strings"
-
-	"github.com/int128/kubelogin/adaptors/interfaces"
-	"github.com/int128/kubelogin/kubeconfig"
-	"github.com/int128/kubelogin/usecases/interfaces"
-	"github.com/spf13/pflag"
-	"go.uber.org/dig"
-)
-
-const usage = `Login to the OpenID Connect provider and update the kubeconfig.
-kubelogin %[2]s
-
-Examples:
-  # Login to the current provider and update ~/.kube/config
-  %[1]s
-
-Options:
-%[3]s
-Usage:
-  %[1]s [options]`
-
-var defaultListenPort = []int{8000, 18000}
-
-func NewCmd(i Cmd) adaptors.Cmd {
-	return &i
-}
-
-type Cmd struct {
-	dig.In
-	Login  usecases.Login
-	Logger adaptors.Logger
-}
-
-func (cmd *Cmd) Run(ctx context.Context, args []string, version string) int {
-	executable := executableName(args[0])
-	f := pflag.NewFlagSet(executable, pflag.ContinueOnError)
-	f.SortFlags = false
-	f.Usage = func() {
-		cmd.Logger.Printf(usage, executable, version, f.FlagUsages())
-	}
-	var o cmdOptions
-	f.StringVar(&o.KubeConfig, "kubeconfig", "", "Path to the kubeconfig file")
-	f.StringVar(&o.KubeContext, "context", "", "The name of the kubeconfig context to use")
-	f.StringVar(&o.KubeUser, "user", "", "The name of the kubeconfig user to use. Prior to --context")
-	f.IntSliceVar(&o.ListenPort, "listen-port", defaultListenPort, "Port to bind to the local server. If multiple ports are given, it will try the ports in order")
-	f.BoolVar(&o.SkipOpenBrowser, "skip-open-browser", false, "If true, it does not open the browser on authentication")
-	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")
-	f.IntVarP(&o.Verbose, "v", "v", 0, "If set to 1 or greater, it shows debug log")
-
-	if err := f.Parse(args[1:]); err != nil {
-		if err == pflag.ErrHelp {
-			return 1
-		}
-		cmd.Logger.Printf("Error: invalid arguments: %s", err)
-		return 1
-	}
-	if len(f.Args()) > 0 {
-		cmd.Logger.Printf("Error: too many arguments")
-		return 1
-	}
-
-	cmd.Logger.SetLevel(adaptors.LogLevel(o.Verbose))
-	in := usecases.LoginIn{
-		KubeConfigFilename:           o.KubeConfig,
-		KubeContextName:              kubeconfig.ContextName(o.KubeContext),
-		KubeUserName:                 kubeconfig.UserName(o.KubeUser),
-		CertificateAuthorityFilename: o.CertificateAuthority,
-		SkipTLSVerify:                o.SkipTLSVerify,
-		ListenPort:                   o.ListenPort,
-		SkipOpenBrowser:              o.SkipOpenBrowser,
-	}
-	if err := cmd.Login.Do(ctx, in); err != nil {
-		cmd.Logger.Printf("Error: %s", err)
-		return 1
-	}
-	return 0
-}
-
-type cmdOptions struct {
-	KubeConfig           string
-	KubeContext          string
-	KubeUser             string
-	CertificateAuthority string
-	SkipTLSVerify        bool
-	ListenPort           []int
-	SkipOpenBrowser      bool
-	Verbose              int
-}
-
-func executableName(arg0 string) string {
-	if strings.HasPrefix(arg0, "kubectl-") {
-		return strings.ReplaceAll(strings.ReplaceAll(arg0, "-", " "), "_", "-")
-	}
-	return arg0
-}

adaptors/cmd_test.go

@@ -1,111 +0,0 @@
-package adaptors
-
-import (
-	"context"
-	"testing"
-
-	"github.com/golang/mock/gomock"
-	"github.com/int128/kubelogin/adaptors/interfaces"
-	"github.com/int128/kubelogin/adaptors/mock_adaptors"
-	"github.com/int128/kubelogin/usecases/interfaces"
-	"github.com/int128/kubelogin/usecases/mock_usecases"
-)
-
-func TestCmd_Run(t *testing.T) {
-	const executable = "kubelogin"
-	const version = "HEAD"
-
-	t.Run("Defaults", func(t *testing.T) {
-		ctrl := gomock.NewController(t)
-		defer ctrl.Finish()
-		ctx := context.TODO()
-
-		login := mock_usecases.NewMockLogin(ctrl)
-		login.EXPECT().
-			Do(ctx, usecases.LoginIn{
-				ListenPort: defaultListenPort,
-			})
-
-		logger := mock_adaptors.NewLogger(t, ctrl)
-		logger.EXPECT().
-			SetLevel(adaptors.LogLevel(0))
-
-		cmd := Cmd{
-			Login:  login,
-			Logger: logger,
-		}
-		exitCode := cmd.Run(ctx, []string{executable}, version)
-		if exitCode != 0 {
-			t.Errorf("exitCode wants 0 but %d", exitCode)
-		}
-	})
-
-	t.Run("FullOptions", func(t *testing.T) {
-		ctrl := gomock.NewController(t)
-		defer ctrl.Finish()
-		ctx := context.TODO()
-
-		login := mock_usecases.NewMockLogin(ctrl)
-		login.EXPECT().
-			Do(ctx, usecases.LoginIn{
-				KubeConfigFilename:           "/path/to/kubeconfig",
-				KubeContextName:              "hello.k8s.local",
-				KubeUserName:                 "google",
-				CertificateAuthorityFilename: "/path/to/cacert",
-				SkipTLSVerify:                true,
-				ListenPort:                   []int{10080, 20080},
-				SkipOpenBrowser:              true,
-			})
-
-		logger := mock_adaptors.NewLogger(t, ctrl)
-		logger.EXPECT().
-			SetLevel(adaptors.LogLevel(1))
-
-		cmd := Cmd{
-			Login:  login,
-			Logger: logger,
-		}
-		exitCode := cmd.Run(ctx, []string{executable,
-			"--kubeconfig", "/path/to/kubeconfig",
-			"--context", "hello.k8s.local",
-			"--user", "google",
-			"--listen-port", "10080",
-			"--listen-port", "20080",
-			"--skip-open-browser",
-			"--certificate-authority", "/path/to/cacert",
-			"--insecure-skip-tls-verify",
-			"-v1",
-		}, version)
-		if exitCode != 0 {
-			t.Errorf("exitCode wants 0 but %d", exitCode)
-		}
-	})
-
-	t.Run("TooManyArgs", func(t *testing.T) {
-		ctrl := gomock.NewController(t)
-		defer ctrl.Finish()
-		cmd := Cmd{
-			Login:  mock_usecases.NewMockLogin(ctrl),
-			Logger: mock_adaptors.NewLogger(t, ctrl),
-		}
-		exitCode := cmd.Run(context.TODO(), []string{executable, "some"}, version)
-		if exitCode != 1 {
-			t.Errorf("exitCode wants 1 but %d", exitCode)
-		}
-	})
-}
-
-func TestCmd_executableName(t *testing.T) {
-	t.Run("kubelogin", func(t *testing.T) {
-		e := executableName("kubelogin")
-		if e != "kubelogin" {
-			t.Errorf("executableName wants kubelogin but %s", e)
-		}
-	})
-	t.Run("kubectl-oidc_login", func(t *testing.T) {
-		e := executableName("kubectl-oidc_login")
-		if e != "kubectl oidc-login" {
-			t.Errorf("executableName wants kubectl oidc-login but %s", e)
-		}
-	})
-}

adaptors/http.go

@@ -1,85 +0,0 @@
-package adaptors
-
-import (
-	"crypto/tls"
-	"crypto/x509"
-	"encoding/base64"
-	"io/ioutil"
-	"net/http"
-
-	"github.com/int128/kubelogin/adaptors/interfaces"
-	"github.com/int128/kubelogin/infrastructure"
-	"github.com/pkg/errors"
-	"go.uber.org/dig"
-)
-
-func NewHTTP(i HTTP) adaptors.HTTP {
-	return &i
-}
-
-type HTTP struct {
-	dig.In
-	Logger adaptors.Logger
-}
-
-func (h *HTTP) NewClient(config adaptors.HTTPClientConfig) (*http.Client, error) {
-	pool := x509.NewCertPool()
-	if filename := config.OIDCConfig.IDPCertificateAuthority(); filename != "" {
-		h.Logger.Debugf(1, "Loading the certificate %s", filename)
-		err := appendCertificateFromFile(pool, filename)
-		if err != nil {
-			return nil, errors.Wrapf(err, "could not load the certificate of idp-certificate-authority")
-		}
-	}
-	if data := config.OIDCConfig.IDPCertificateAuthorityData(); data != "" {
-		h.Logger.Debugf(1, "Loading the certificate of idp-certificate-authority-data")
-		err := appendEncodedCertificate(pool, data)
-		if err != nil {
-			return nil, errors.Wrapf(err, "could not load the certificate of idp-certificate-authority-data")
-		}
-	}
-	if config.CertificateAuthorityFilename != "" {
-		h.Logger.Debugf(1, "Loading the certificate %s", config.CertificateAuthorityFilename)
-		err := appendCertificateFromFile(pool, config.CertificateAuthorityFilename)
-		if err != nil {
-			return nil, errors.Wrapf(err, "could not load the certificate")
-		}
-	}
-
-	var tlsConfig tls.Config
-	if len(pool.Subjects()) > 0 {
-		tlsConfig.RootCAs = pool
-	}
-	tlsConfig.InsecureSkipVerify = config.SkipTLSVerify
-	return &http.Client{
-		Transport: &infrastructure.LoggingTransport{
-			Base: &http.Transport{
-				TLSClientConfig: &tlsConfig,
-				Proxy:           http.ProxyFromEnvironment,
-			},
-			Logger: h.Logger,
-		},
-	}, nil
-}
-
-func appendCertificateFromFile(pool *x509.CertPool, filename string) error {
-	b, err := ioutil.ReadFile(filename)
-	if err != nil {
-		return errors.Wrapf(err, "could not read %s", filename)
-	}
-	if !pool.AppendCertsFromPEM(b) {
-		return errors.Errorf("could not append certificate from %s", filename)
-	}
-	return nil
-}
-
-func appendEncodedCertificate(pool *x509.CertPool, base64String string) error {
-	b, err := base64.StdEncoding.DecodeString(base64String)
-	if err != nil {
-		return errors.Wrapf(err, "could not decode base64")
-	}
-	if !pool.AppendCertsFromPEM(b) {
-		return errors.Errorf("could not append certificate")
-	}
-	return nil
-}

adaptors/interfaces/adaptors.go

@@ -1,74 +0,0 @@
-package adaptors
-
-import (
-	"context"
-	"net/http"
-
-	"github.com/coreos/go-oidc"
-	"github.com/int128/kubelogin/kubeconfig"
-)
-
-//go:generate mockgen -package mock_adaptors -destination ../mock_adaptors/mock_adaptors.go github.com/int128/kubelogin/adaptors/interfaces KubeConfig,HTTP,OIDC,Logger
-
-type Cmd interface {
-	Run(ctx context.Context, args []string, version string) int
-}
-
-type KubeConfig interface {
-	LoadByDefaultRules(filename string) (*kubeconfig.Config, error)
-	LoadFromFile(filename string) (*kubeconfig.Config, error)
-	WriteToFile(config *kubeconfig.Config, filename string) error
-}
-
-type HTTP interface {
-	NewClient(config HTTPClientConfig) (*http.Client, error)
-}
-
-type HTTPClientConfig struct {
-	OIDCConfig                   kubeconfig.OIDCConfig
-	CertificateAuthorityFilename string
-	SkipTLSVerify                bool
-}
-
-type OIDC interface {
-	Authenticate(ctx context.Context, in OIDCAuthenticateIn, cb OIDCAuthenticateCallback) (*OIDCAuthenticateOut, error)
-	Verify(ctx context.Context, in OIDCVerifyIn) (*oidc.IDToken, error)
-}
-
-type OIDCAuthenticateIn struct {
-	Config          kubeconfig.OIDCConfig
-	Client          *http.Client // HTTP client for oidc and oauth2
-	LocalServerPort []int        // HTTP server port candidates
-	SkipOpenBrowser bool         // skip opening browser if true
-}
-
-type OIDCAuthenticateCallback struct {
-	ShowLocalServerURL func(url string)
-}
-
-type OIDCAuthenticateOut struct {
-	VerifiedIDToken *oidc.IDToken
-	IDToken         string
-	RefreshToken    string
-}
-
-type OIDCVerifyIn struct {
-	Config kubeconfig.OIDCConfig
-	Client *http.Client
-}
-
-type Logger interface {
-	Printf(format string, v ...interface{})
-	Debugf(level LogLevel, format string, v ...interface{})
-	SetLevel(level LogLevel)
-	IsEnabled(level LogLevel) bool
-}
-
-// LogLevel represents a log level for debug.
-//
-// 0 = None
-// 1 = Including in/out
-// 2 = Including transport headers
-// 3 = Including transport body
-//
-type LogLevel int

adaptors/kubeconfig.go

@@ -1,44 +0,0 @@
-package adaptors
-
-import (
-	"github.com/int128/kubelogin/adaptors/interfaces"
-	"github.com/int128/kubelogin/kubeconfig"
-	"github.com/pkg/errors"
-	"k8s.io/client-go/tools/clientcmd"
-	"k8s.io/client-go/tools/clientcmd/api"
-)
-
-func NewKubeConfig() adaptors.KubeConfig {
-	return &KubeConfig{}
-}
-
-type KubeConfig struct{}
-
-// LoadByDefaultRules loads the config by the default rules, that is same as kubectl.
-func (*KubeConfig) LoadByDefaultRules(filename string) (*kubeconfig.Config, error) {
-	rules := clientcmd.NewDefaultClientConfigLoadingRules()
-	rules.ExplicitPath = filename
-	config, err := rules.Load()
-	if err != nil {
-		return nil, errors.Wrapf(err, "could not read the kubeconfig")
-	}
-	return (*kubeconfig.Config)(config), err
-}
-
-// LoadFromFile loads the config from the single file.
-func (*KubeConfig) LoadFromFile(filename string) (*kubeconfig.Config, error) {
-	config, err := clientcmd.LoadFromFile(filename)
-	if err != nil {
-		return nil, errors.Wrapf(err, "could not read the kubeconfig from %s", filename)
-	}
-	return (*kubeconfig.Config)(config), err
-}
-
-// WriteToFile writes the config to the single file.
-func (*KubeConfig) WriteToFile(config *kubeconfig.Config, filename string) error {
-	err := clientcmd.WriteToFile(*(*api.Config)(config), filename)
-	if err != nil {
-		return errors.Wrapf(err, "could not write the kubeconfig to %s", filename)
-	}
-	return err
-}

adaptors/kubeconfig_test.go

@@ -1,74 +0,0 @@
-package adaptors
-
-import (
-	"os"
-	"testing"
-)
-
-func TestKubeConfig_LoadByDefaultRules(t *testing.T) {
-	var adaptor KubeConfig
-
-	t.Run("google.yaml>keycloak.yaml", func(t *testing.T) {
-		setenv(t, "KUBECONFIG", "testdata/kubeconfig.google.yaml"+string(os.PathListSeparator)+"testdata/kubeconfig.keycloak.yaml")
-		defer unsetenv(t, "KUBECONFIG")
-
-		config, err := adaptor.LoadByDefaultRules("")
-		if err != nil {
-			t.Fatalf("Could not load the configs: %s", err)
-		}
-		if w := "google@hello.k8s.local"; w != config.CurrentContext {
-			t.Errorf("CurrentContext wants %s but %s", w, config.CurrentContext)
-		}
-		if _, ok := config.Contexts["google@hello.k8s.local"]; !ok {
-			t.Errorf("Contexts[google@hello.k8s.local] is missing")
-		}
-		if _, ok := config.Contexts["keycloak@hello.k8s.local"]; !ok {
-			t.Errorf("Contexts[keycloak@hello.k8s.local] is missing")
-		}
-		if _, ok := config.AuthInfos["google"]; !ok {
-			t.Errorf("AuthInfos[google] is missing")
-		}
-		if _, ok := config.AuthInfos["keycloak"]; !ok {
-			t.Errorf("AuthInfos[keycloak] is missing")
-		}
-	})
-
-	t.Run("keycloak.yaml>google.yaml", func(t *testing.T) {
-		setenv(t, "KUBECONFIG", "testdata/kubeconfig.keycloak.yaml"+string(os.PathListSeparator)+"testdata/kubeconfig.google.yaml")
-		defer unsetenv(t, "KUBECONFIG")
-
-		config, err := adaptor.LoadByDefaultRules("")
-		if err != nil {
-			t.Fatalf("Could not load the configs: %s", err)
-		}
-		if w := "keycloak@hello.k8s.local"; w != config.CurrentContext {
-			t.Errorf("CurrentContext wants %s but %s", w, config.CurrentContext)
-		}
-		if _, ok := config.Contexts["google@hello.k8s.local"]; !ok {
-			t.Errorf("Contexts[google@hello.k8s.local] is missing")
-		}
-		if _, ok := config.Contexts["keycloak@hello.k8s.local"]; !ok {
-			t.Errorf("Contexts[keycloak@hello.k8s.local] is missing")
-		}
-		if _, ok := config.AuthInfos["google"]; !ok {
-			t.Errorf("AuthInfos[google] is missing")
-		}
-		if _, ok := config.AuthInfos["keycloak"]; !ok {
-			t.Errorf("AuthInfos[keycloak] is missing")
-		}
-	})
-}
-
-func setenv(t *testing.T, key, value string) {
-	t.Helper()
-	if err := os.Setenv(key, value); err != nil {
-		t.Fatalf("Could not set the env var %s=%s: %s", key, value, err)
-	}
-}
-
-func unsetenv(t *testing.T, key string) {
-	t.Helper()
-	if err := os.Unsetenv(key); err != nil {
-		t.Fatalf("Could not unset the env var %s: %s", key, err)
-	}
-}

adaptors/logger.go

@@ -1,49 +0,0 @@
-package adaptors
-
-import (
-	"log"
-	"os"
-
-	"github.com/int128/kubelogin/adaptors/interfaces"
-)
-
-// NewLogger returns a Logger with the standard log.Logger for messages and debug.
-func NewLogger() adaptors.Logger {
-	return &Logger{
-		stdLogger:   log.New(os.Stderr, "", 0),
-		debugLogger: log.New(os.Stderr, "", log.Ltime|log.Lmicroseconds),
-	}
-}
-
-// NewLoggerWith returns a Logger with the given standard log.Logger.
-func NewLoggerWith(l stdLogger) *Logger {
-	return &Logger{
-		stdLogger:   l,
-		debugLogger: l,
-	}
-}
-
-type stdLogger interface {
-	Printf(format string, v ...interface{})
-}
-
-// Logger wraps the standard log.Logger and just provides debug level.
-type Logger struct {
-	stdLogger
-	debugLogger stdLogger
-	level       adaptors.LogLevel
-}
-
-func (l *Logger) Debugf(level adaptors.LogLevel, format string, v ...interface{}) {
-	if l.IsEnabled(level) {
-		l.debugLogger.Printf(format, v...)
-	}
-}
-
-func (l *Logger) SetLevel(level adaptors.LogLevel) {
-	l.level = level
-}
-
-func (l *Logger) IsEnabled(level adaptors.LogLevel) bool {
-	return level <= l.level
-}

adaptors/logger_test.go

@@ -1,53 +0,0 @@
-package adaptors
-
-import (
-	"fmt"
-	"testing"
-
-	"github.com/int128/kubelogin/adaptors/interfaces"
-)
-
-type mockStdLogger struct {
-	count int
-}
-
-func (l *mockStdLogger) Printf(format string, v ...interface{}) {
-	l.count++
-}
-
-func TestLogger_Debugf(t *testing.T) {
-	for _, c := range []struct {
-		loggerLevel adaptors.LogLevel
-		debugfLevel adaptors.LogLevel
-		count       int
-	}{
-		{0, 0, 1},
-		{0, 1, 0},
-
-		{1, 0, 1},
-		{1, 1, 1},
-		{1, 2, 0},
-
-		{2, 1, 1},
-		{2, 2, 1},
-		{2, 3, 0},
-	} {
-		t.Run(fmt.Sprintf("%+v", c), func(t *testing.T) {
-			m := &mockStdLogger{}
-			l := &Logger{debugLogger: m, level: c.loggerLevel}
-			l.Debugf(c.debugfLevel, "hello")
-			if m.count != c.count {
-				t.Errorf("count wants %d but %d", c.count, m.count)
-			}
-		})
-	}
-}
-
-func TestLogger_Printf(t *testing.T) {
-	m := &mockStdLogger{}
-	l := &Logger{stdLogger: m}
-	l.Printf("hello")
-	if m.count != 1 {
-		t.Errorf("count wants %d but %d", 1, m.count)
-	}
-}

adaptors/mock_adaptors/logger.go

@@ -1,31 +0,0 @@
-package mock_adaptors
-
-import (
-	"github.com/golang/mock/gomock"
-	"github.com/int128/kubelogin/adaptors/interfaces"
-)
-
-func NewLogger(t testingLogger, ctrl *gomock.Controller) *Logger {
-	return &Logger{
-		MockLogger:    NewMockLogger(ctrl),
-		testingLogger: t,
-	}
-}
-
-type testingLogger interface {
-	Logf(format string, v ...interface{})
-}
-
-// Logger provides mock feature but overrides output methods with actual logging.
-type Logger struct {
-	*MockLogger
-	testingLogger testingLogger
-}
-
-func (l *Logger) Printf(format string, v ...interface{}) {
-	l.testingLogger.Logf(format, v...)
-}
-
-func (l *Logger) Debugf(level adaptors.LogLevel, format string, v ...interface{}) {
-	l.testingLogger.Logf(format, v...)
-}

adaptors/mock_adaptors/mock_adaptors.go

@@ -1,236 +0,0 @@
-// Code generated by MockGen. DO NOT EDIT.
-// Source: github.com/int128/kubelogin/adaptors/interfaces (interfaces: KubeConfig,HTTP,OIDC,Logger)
-
-// Package mock_adaptors is a generated GoMock package.
-package mock_adaptors
-
-import (
-	context "context"
-	go_oidc "github.com/coreos/go-oidc"
-	gomock "github.com/golang/mock/gomock"
-	interfaces "github.com/int128/kubelogin/adaptors/interfaces"
-	kubeconfig "github.com/int128/kubelogin/kubeconfig"
-	http "net/http"
-	reflect "reflect"
-)
-
-// MockKubeConfig is a mock of KubeConfig interface
-type MockKubeConfig struct {
-	ctrl     *gomock.Controller
-	recorder *MockKubeConfigMockRecorder
-}
-
-// MockKubeConfigMockRecorder is the mock recorder for MockKubeConfig
-type MockKubeConfigMockRecorder struct {
-	mock *MockKubeConfig
-}
-
-// NewMockKubeConfig creates a new mock instance
-func NewMockKubeConfig(ctrl *gomock.Controller) *MockKubeConfig {
-	mock := &MockKubeConfig{ctrl: ctrl}
-	mock.recorder = &MockKubeConfigMockRecorder{mock}
-	return mock
-}
-
-// EXPECT returns an object that allows the caller to indicate expected use
-func (m *MockKubeConfig) EXPECT() *MockKubeConfigMockRecorder {
-	return m.recorder
-}
-
-// LoadByDefaultRules mocks base method
-func (m *MockKubeConfig) LoadByDefaultRules(arg0 string) (*kubeconfig.Config, error) {
-	ret := m.ctrl.Call(m, "LoadByDefaultRules", arg0)
-	ret0, _ := ret[0].(*kubeconfig.Config)
-	ret1, _ := ret[1].(error)
-	return ret0, ret1
-}
-
-// LoadByDefaultRules indicates an expected call of LoadByDefaultRules
-func (mr *MockKubeConfigMockRecorder) LoadByDefaultRules(arg0 interface{}) *gomock.Call {
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "LoadByDefaultRules", reflect.TypeOf((*MockKubeConfig)(nil).LoadByDefaultRules), arg0)
-}
-
-// LoadFromFile mocks base method
-func (m *MockKubeConfig) LoadFromFile(arg0 string) (*kubeconfig.Config, error) {
-	ret := m.ctrl.Call(m, "LoadFromFile", arg0)
-	ret0, _ := ret[0].(*kubeconfig.Config)
-	ret1, _ := ret[1].(error)
-	return ret0, ret1
-}
-
-// LoadFromFile indicates an expected call of LoadFromFile
-func (mr *MockKubeConfigMockRecorder) LoadFromFile(arg0 interface{}) *gomock.Call {
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "LoadFromFile", reflect.TypeOf((*MockKubeConfig)(nil).LoadFromFile), arg0)
-}
-
-// WriteToFile mocks base method
-func (m *MockKubeConfig) WriteToFile(arg0 *kubeconfig.Config, arg1 string) error {
-	ret := m.ctrl.Call(m, "WriteToFile", arg0, arg1)
-	ret0, _ := ret[0].(error)
-	return ret0
-}
-
-// WriteToFile indicates an expected call of WriteToFile
-func (mr *MockKubeConfigMockRecorder) WriteToFile(arg0, arg1 interface{}) *gomock.Call {
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "WriteToFile", reflect.TypeOf((*MockKubeConfig)(nil).WriteToFile), arg0, arg1)
-}
-
-// MockHTTP is a mock of HTTP interface
-type MockHTTP struct {
-	ctrl     *gomock.Controller
-	recorder *MockHTTPMockRecorder
-}
-
-// MockHTTPMockRecorder is the mock recorder for MockHTTP
-type MockHTTPMockRecorder struct {
-	mock *MockHTTP
-}
-
-// NewMockHTTP creates a new mock instance
-func NewMockHTTP(ctrl *gomock.Controller) *MockHTTP {
-	mock := &MockHTTP{ctrl: ctrl}
-	mock.recorder = &MockHTTPMockRecorder{mock}
-	return mock
-}
-
-// EXPECT returns an object that allows the caller to indicate expected use
-func (m *MockHTTP) EXPECT() *MockHTTPMockRecorder {
-	return m.recorder
-}
-
-// NewClient mocks base method
-func (m *MockHTTP) NewClient(arg0 interfaces.HTTPClientConfig) (*http.Client, error) {
-	ret := m.ctrl.Call(m, "NewClient", arg0)
-	ret0, _ := ret[0].(*http.Client)
-	ret1, _ := ret[1].(error)
-	return ret0, ret1
-}
-
-// NewClient indicates an expected call of NewClient
-func (mr *MockHTTPMockRecorder) NewClient(arg0 interface{}) *gomock.Call {
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "NewClient", reflect.TypeOf((*MockHTTP)(nil).NewClient), arg0)
-}
-
-// MockOIDC is a mock of OIDC interface
-type MockOIDC struct {
-	ctrl     *gomock.Controller
-	recorder *MockOIDCMockRecorder
-}
-
-// MockOIDCMockRecorder is the mock recorder for MockOIDC
-type MockOIDCMockRecorder struct {
-	mock *MockOIDC
-}
-
-// NewMockOIDC creates a new mock instance
-func NewMockOIDC(ctrl *gomock.Controller) *MockOIDC {
-	mock := &MockOIDC{ctrl: ctrl}
-	mock.recorder = &MockOIDCMockRecorder{mock}
-	return mock
-}
-
-// EXPECT returns an object that allows the caller to indicate expected use
-func (m *MockOIDC) EXPECT() *MockOIDCMockRecorder {
-	return m.recorder
-}
-
-// Authenticate mocks base method
-func (m *MockOIDC) Authenticate(arg0 context.Context, arg1 interfaces.OIDCAuthenticateIn, arg2 interfaces.OIDCAuthenticateCallback) (*interfaces.OIDCAuthenticateOut, error) {
-	ret := m.ctrl.Call(m, "Authenticate", arg0, arg1, arg2)
-	ret0, _ := ret[0].(*interfaces.OIDCAuthenticateOut)
-	ret1, _ := ret[1].(error)
-	return ret0, ret1
-}
-
-// Authenticate indicates an expected call of Authenticate
-func (mr *MockOIDCMockRecorder) Authenticate(arg0, arg1, arg2 interface{}) *gomock.Call {
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Authenticate", reflect.TypeOf((*MockOIDC)(nil).Authenticate), arg0, arg1, arg2)
-}
-
-// Verify mocks base method
-func (m *MockOIDC) Verify(arg0 context.Context, arg1 interfaces.OIDCVerifyIn) (*go_oidc.IDToken, error) {
-	ret := m.ctrl.Call(m, "Verify", arg0, arg1)
-	ret0, _ := ret[0].(*go_oidc.IDToken)
-	ret1, _ := ret[1].(error)
-	return ret0, ret1
-}
-
-// Verify indicates an expected call of Verify
-func (mr *MockOIDCMockRecorder) Verify(arg0, arg1 interface{}) *gomock.Call {
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Verify", reflect.TypeOf((*MockOIDC)(nil).Verify), arg0, arg1)
-}
-
-// MockLogger is a mock of Logger interface
-type MockLogger struct {
-	ctrl     *gomock.Controller
-	recorder *MockLoggerMockRecorder
-}
-
-// MockLoggerMockRecorder is the mock recorder for MockLogger
-type MockLoggerMockRecorder struct {
-	mock *MockLogger
-}
-
-// NewMockLogger creates a new mock instance
-func NewMockLogger(ctrl *gomock.Controller) *MockLogger {
-	mock := &MockLogger{ctrl: ctrl}
-	mock.recorder = &MockLoggerMockRecorder{mock}
-	return mock
-}
-
-// EXPECT returns an object that allows the caller to indicate expected use
-func (m *MockLogger) EXPECT() *MockLoggerMockRecorder {
-	return m.recorder
-}
-
-// Debugf mocks base method
-func (m *MockLogger) Debugf(arg0 interfaces.LogLevel, arg1 string, arg2 ...interface{}) {
-	varargs := []interface{}{arg0, arg1}
-	for _, a := range arg2 {
-		varargs = append(varargs, a)
-	}
-	m.ctrl.Call(m, "Debugf", varargs...)
-}
-
-// Debugf indicates an expected call of Debugf
-func (mr *MockLoggerMockRecorder) Debugf(arg0, arg1 interface{}, arg2 ...interface{}) *gomock.Call {
-	varargs := append([]interface{}{arg0, arg1}, arg2...)
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Debugf", reflect.TypeOf((*MockLogger)(nil).Debugf), varargs...)
-}
-
-// IsEnabled mocks base method
-func (m *MockLogger) IsEnabled(arg0 interfaces.LogLevel) bool {
-	ret := m.ctrl.Call(m, "IsEnabled", arg0)
-	ret0, _ := ret[0].(bool)
-	return ret0
-}
-
-// IsEnabled indicates an expected call of IsEnabled
-func (mr *MockLoggerMockRecorder) IsEnabled(arg0 interface{}) *gomock.Call {
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "IsEnabled", reflect.TypeOf((*MockLogger)(nil).IsEnabled), arg0)
-}
-
-// Printf mocks base method
-func (m *MockLogger) Printf(arg0 string, arg1 ...interface{}) {
-	varargs := []interface{}{arg0}
-	for _, a := range arg1 {
-		varargs = append(varargs, a)
-	}
-	m.ctrl.Call(m, "Printf", varargs...)
-}
-
-// Printf indicates an expected call of Printf
-func (mr *MockLoggerMockRecorder) Printf(arg0 interface{}, arg1 ...interface{}) *gomock.Call {
-	varargs := append([]interface{}{arg0}, arg1...)
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Printf", reflect.TypeOf((*MockLogger)(nil).Printf), varargs...)
-}
-
-// SetLevel mocks base method
-func (m *MockLogger) SetLevel(arg0 interfaces.LogLevel) {
-	m.ctrl.Call(m, "SetLevel", arg0)
-}
-
-// SetLevel indicates an expected call of SetLevel
-func (mr *MockLoggerMockRecorder) SetLevel(arg0 interface{}) *gomock.Call {
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "SetLevel", reflect.TypeOf((*MockLogger)(nil).SetLevel), arg0)
-}

adaptors/oidc.go

@@ -1,73 +0,0 @@
-package adaptors
-
-import (
-	"context"
-
-	"github.com/coreos/go-oidc"
-	"github.com/int128/kubelogin/adaptors/interfaces"
-	"github.com/int128/oauth2cli"
-	"github.com/pkg/errors"
-	"golang.org/x/oauth2"
-)
-
-func NewOIDC() adaptors.OIDC {
-	return &OIDC{}
-}
-
-type OIDC struct{}
-
-func (*OIDC) Authenticate(ctx context.Context, in adaptors.OIDCAuthenticateIn, cb adaptors.OIDCAuthenticateCallback) (*adaptors.OIDCAuthenticateOut, error) {
-	if in.Client != nil {
-		ctx = context.WithValue(ctx, oauth2.HTTPClient, in.Client)
-	}
-	provider, err := oidc.NewProvider(ctx, in.Config.IDPIssuerURL())
-	if err != nil {
-		return nil, errors.Wrapf(err, "could not discovery the OIDC issuer")
-	}
-	config := oauth2cli.Config{
-		OAuth2Config: oauth2.Config{
-			Endpoint:     provider.Endpoint(),
-			ClientID:     in.Config.ClientID(),
-			ClientSecret: in.Config.ClientSecret(),
-			Scopes:       append(in.Config.ExtraScopes(), oidc.ScopeOpenID),
-		},
-		LocalServerPort:    in.LocalServerPort,
-		SkipOpenBrowser:    in.SkipOpenBrowser,
-		AuthCodeOptions:    []oauth2.AuthCodeOption{oauth2.AccessTypeOffline},
-		ShowLocalServerURL: cb.ShowLocalServerURL,
-	}
-	token, err := oauth2cli.GetToken(ctx, config)
-	if err != nil {
-		return nil, errors.Wrapf(err, "could not get a token")
-	}
-	idToken, ok := token.Extra("id_token").(string)
-	if !ok {
-		return nil, errors.Errorf("id_token is missing in the token response: %s", token)
-	}
-	verifier := provider.Verifier(&oidc.Config{ClientID: in.Config.ClientID()})
-	verifiedIDToken, err := verifier.Verify(ctx, idToken)
-	if err != nil {
-		return nil, errors.Wrapf(err, "could not verify the id_token")
-	}
-	return &adaptors.OIDCAuthenticateOut{
-		VerifiedIDToken: verifiedIDToken,
-		IDToken:         idToken,
-		RefreshToken:    token.RefreshToken,
-	}, nil
-}
-
-func (*OIDC) Verify(ctx context.Context, in adaptors.OIDCVerifyIn) (*oidc.IDToken, error) {
-	if in.Client != nil {
-		ctx = context.WithValue(ctx, oauth2.HTTPClient, in.Client)
-	}
-	provider, err := oidc.NewProvider(ctx, in.Config.IDPIssuerURL())
-	if err != nil {
-		return nil, errors.Wrapf(err, "could not discovery the OIDC issuer")
-	}
-	verifier := provider.Verifier(&oidc.Config{ClientID: in.Config.ClientID()})
-	verifiedIDToken, err := verifier.Verify(ctx, in.Config.IDToken())
-	if err != nil {
-		return nil, errors.Wrapf(err, "could not verify the id_token")
-	}
-	return verifiedIDToken, nil
-}

adaptors_test/authserver/authserver.go

@@ -1,39 +0,0 @@
-package authserver
-
-import (
-	"crypto/rsa"
-	"net/http"
-	"testing"
-)
-
-// Config represents server configuration.
-type Config struct {
-	Addr           string
-	Issuer         string
-	Scope          string
-	TLSServerCert  string
-	TLSServerKey   string
-	IDToken        string
-	RefreshToken   string
-	IDTokenKeyPair *rsa.PrivateKey
-}
-
-// Start starts a HTTP server.
-func Start(t *testing.T, c Config) *http.Server {
-	s := &http.Server{
-		Addr:    c.Addr,
-		Handler: newHandler(t, c),
-	}
-	go func() {
-		var err error
-		if c.TLSServerCert != "" && c.TLSServerKey != "" {
-			err = s.ListenAndServeTLS(c.TLSServerCert, c.TLSServerKey)
-		} else {
-			err = s.ListenAndServe()
-		}
-		if err != nil && err != http.ErrServerClosed {
-			t.Error(err)
-		}
-	}()
-	return s
-}

adaptors_test/authserver/handler.go

@@ -1,108 +0,0 @@
-package authserver
-
-import (
-	"encoding/base64"
-	"fmt"
-	"math/big"
-	"net/http"
-	"testing"
-	"text/template"
-
-	"github.com/pkg/errors"
-)
-
-type handler struct {
-	t *testing.T
-
-	discovery *template.Template
-	token     *template.Template
-	jwks      *template.Template
-	authCode  string
-
-	// Template values
-	Issuer       string
-	Scope        string // Default to openid
-	IDToken      string
-	RefreshToken string
-	PrivateKey   struct{ N, E string }
-}
-
-func newHandler(t *testing.T, c Config) *handler {
-	tpl, err := template.ParseFiles(
-		"authserver/testdata/oidc-discovery.json",
-		"authserver/testdata/oidc-token.json",
-		"authserver/testdata/oidc-jwks.json",
-	)
-	if err != nil {
-		t.Fatalf("could not read the templates: %s", err)
-	}
-	h := handler{
-		t:            t,
-		discovery:    tpl.Lookup("oidc-discovery.json"),
-		token:        tpl.Lookup("oidc-token.json"),
-		jwks:         tpl.Lookup("oidc-jwks.json"),
-		authCode:     "3d24a8bd-35e6-457d-999e-e04bb1dfcec7",
-		Issuer:       c.Issuer,
-		Scope:        c.Scope,
-		IDToken:      c.IDToken,
-		RefreshToken: c.RefreshToken,
-	}
-	if h.Scope == "" {
-		h.Scope = "openid"
-	}
-	if c.IDTokenKeyPair != nil {
-		h.PrivateKey.E = base64.RawURLEncoding.EncodeToString(big.NewInt(int64(c.IDTokenKeyPair.E)).Bytes())
-		h.PrivateKey.N = base64.RawURLEncoding.EncodeToString(c.IDTokenKeyPair.N.Bytes())
-	}
-	return &h
-}
-
-func (h *handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
-	if err := h.serveHTTP(w, r); err != nil {
-		h.t.Logf("[auth-server] Error: %s", err)
-		w.WriteHeader(500)
-	}
-}
-
-func (h *handler) serveHTTP(w http.ResponseWriter, r *http.Request) error {
-	m := r.Method
-	p := r.URL.Path
-	h.t.Logf("[auth-server] %s %s", m, r.RequestURI)
-	switch {
-	case m == "GET" && p == "/.well-known/openid-configuration":
-		w.Header().Add("Content-Type", "application/json")
-		if err := h.discovery.Execute(w, h); err != nil {
-			return errors.Wrapf(err, "could not execute the template")
-		}
-	case m == "GET" && p == "/protocol/openid-connect/auth":
-		// Authentication Response
-		// http://openid.net/specs/openid-connect-core-1_0.html#AuthResponse
-		q := r.URL.Query()
-		if h.Scope != q.Get("scope") {
-			return errors.Errorf("scope wants %s but %s", h.Scope, q.Get("scope"))
-		}
-		to := fmt.Sprintf("%s?state=%s&code=%s", q.Get("redirect_uri"), q.Get("state"), h.authCode)
-		http.Redirect(w, r, to, 302)
-	case m == "POST" && p == "/protocol/openid-connect/token":
-		// Token Response
-		// http://openid.net/specs/openid-connect-core-1_0.html#TokenResponse
-		if err := r.ParseForm(); err != nil {
-			return errors.Wrapf(err, "could not parse the form")
-		}
-		if h.authCode != r.Form.Get("code") {
-			return errors.Errorf("code wants %s but %s", h.authCode, r.Form.Get("code"))
-		}
-		w.Header().Add("Content-Type", "application/json")
-		if err := h.token.Execute(w, h); err != nil {
-			return errors.Wrapf(err, "could not execute the template")
-		}
-	case m == "GET" && p == "/protocol/openid-connect/certs":
-		w.Header().Add("Content-Type", "application/json")
-		if err := h.jwks.Execute(w, h); err != nil {
-			return errors.Wrapf(err, "could not execute the template")
-		}
-	default:
-		http.Error(w, "Not Found", 404)
-	}
-	return nil
-}

adaptors_test/authserver/testdata/oidc-discovery.json

@@ -1,85 +0,0 @@
-{
-  "issuer": "{{ .Issuer }}",
-  "authorization_endpoint": "{{ .Issuer }}/protocol/openid-connect/auth",
-  "token_endpoint": "{{ .Issuer }}/protocol/openid-connect/token",
-  "token_introspection_endpoint": "{{ .Issuer }}/protocol/openid-connect/token/introspect",
-  "userinfo_endpoint": "{{ .Issuer }}/protocol/openid-connect/userinfo",
-  "end_session_endpoint": "{{ .Issuer }}/protocol/openid-connect/logout",
-  "jwks_uri": "{{ .Issuer }}/protocol/openid-connect/certs",
-  "check_session_iframe": "{{ .Issuer }}/protocol/openid-connect/login-status-iframe.html",
-  "grant_types_supported": [
-    "authorization_code",
-    "implicit",
-    "refresh_token",
-    "password",
-    "client_credentials"
-  ],
-  "response_types_supported": [
-    "code",
-    "none",
-    "id_token",
-    "token",
-    "id_token token",
-    "code id_token",
-    "code token",
-    "code id_token token"
-  ],
-  "subject_types_supported": [
-    "public",
-    "pairwise"
-  ],
-  "id_token_signing_alg_values_supported": [
-    "RS256"
-  ],
-  "userinfo_signing_alg_values_supported": [
-    "RS256"
-  ],
-  "request_object_signing_alg_values_supported": [
-    "none",
-    "RS256"
-  ],
-  "response_modes_supported": [
-    "query",
-    "fragment",
-    "form_post"
-  ],
-  "registration_endpoint": "{{ .Issuer }}/clients-registrations/openid-connect",
-  "token_endpoint_auth_methods_supported": [
-    "private_key_jwt",
-    "client_secret_basic",
-    "client_secret_post",
-    "client_secret_jwt"
-  ],
-  "token_endpoint_auth_signing_alg_values_supported": [
-    "RS256"
-  ],
-  "claims_supported": [
-    "sub",
-    "iss",
-    "auth_time",
-    "name",
-    "given_name",
-    "family_name",
-    "preferred_username",
-    "email"
-  ],
-  "claim_types_supported": [
-    "normal"
-  ],
-  "claims_parameter_supported": false,
-  "scopes_supported": [
-    "openid",
-    "offline_access",
-    "phone",
-    "address",
-    "email",
-    "profile"
-  ],
-  "request_parameter_supported": true,
-  "request_uri_parameter_supported": true,
-  "code_challenge_methods_supported": [
-    "plain",
-    "S256"
-  ],
-  "tls_client_certificate_bound_access_tokens": true
-}

adaptors_test/authserver/testdata/oidc-jwks.json

@@ -1,12 +0,0 @@
-{
-  "keys": [
-    {
-      "kty": "RSA",
-      "alg": "RS256",
-      "use": "sig",
-      "kid": "xxx",
-      "n": "{{ .PrivateKey.N }}",
-      "e": "{{ .PrivateKey.E }}"
-    }
-  ]
-}

adaptors_test/authserver/testdata/oidc-token.json

@@ -1,7 +0,0 @@
-{
-  "access_token": "7eaae8ab-8f69-45d9-ab7c-73560cd9444d",
-  "token_type": "Bearer",
-  "refresh_token": "{{ .RefreshToken }}",
-  "expires_in": 3600,
-  "id_token": "{{ .IDToken }}"
-}

adaptors_test/cmd_test.go

@@ -1,306 +0,0 @@
-package adaptors_test
-
-import (
-	"context"
-	"crypto/tls"
-	"net/http"
-	"os"
-	"sync"
-	"testing"
-	"time"
-
-	"github.com/dgrijalva/jwt-go"
-	"github.com/int128/kubelogin/adaptors/interfaces"
-	"github.com/int128/kubelogin/adaptors_test/authserver"
-	"github.com/int128/kubelogin/adaptors_test/keys"
-	"github.com/int128/kubelogin/adaptors_test/kubeconfig"
-	"github.com/int128/kubelogin/adaptors_test/logger"
-	"github.com/int128/kubelogin/di"
-)
-
-// Run the integration tests.
-// This assumes that port 800x and 900x are available.
-//
-// 1. Start the auth server at port 900x.
-// 2. Run the Cmd.
-// 3. Open a request for port 800x.
-// 4. Wait for the Cmd.
-// 5. Shutdown the auth server.
-//
-func TestCmd_Run(t *testing.T) {
-	timeout := 1 * time.Second
-
-	t.Run("NoTLS", func(t *testing.T) {
-		t.Parallel()
-		ctx, cancel := context.WithTimeout(context.Background(), timeout)
-		defer cancel()
-
-		idToken := newIDToken(t, "http://localhost:9001")
-		serverConfig := authserver.Config{
-			Addr:           "localhost:9001",
-			Issuer:         "http://localhost:9001",
-			IDToken:        idToken,
-			IDTokenKeyPair: keys.JWSKeyPair,
-			RefreshToken:   "REFRESH_TOKEN",
-		}
-		server := authserver.Start(t, serverConfig)
-		defer shutdown(t, ctx, server)
-
-		kubeConfigFilename := kubeconfig.Create(t, &kubeconfig.Values{
-			Issuer: serverConfig.Issuer,
-		})
-		defer os.Remove(kubeConfigFilename)
-
-		var wg sync.WaitGroup
-		startBrowserRequest(t, ctx, &wg, "http://localhost:8001", nil)
-		runCmd(t, ctx, "--kubeconfig", kubeConfigFilename, "--skip-open-browser", "--listen-port", "8001")
-		wg.Wait()
-		kubeconfig.Verify(t, kubeConfigFilename, kubeconfig.AuthProviderConfig{
-			IDToken:      idToken,
-			RefreshToken: "REFRESH_TOKEN",
-		})
-	})
-
-	t.Run("env:KUBECONFIG", func(t *testing.T) {
-		t.Parallel()
-		ctx, cancel := context.WithTimeout(context.Background(), timeout)
-		defer cancel()
-
-		idToken := newIDToken(t, "http://localhost:9002")
-		serverConfig := authserver.Config{
-			Addr:           "localhost:9002",
-			Issuer:         "http://localhost:9002",
-			IDToken:        idToken,
-			IDTokenKeyPair: keys.JWSKeyPair,
-			RefreshToken:   "REFRESH_TOKEN",
-		}
-		server := authserver.Start(t, serverConfig)
-		defer shutdown(t, ctx, server)
-
-		kubeConfigFilename := kubeconfig.Create(t, &kubeconfig.Values{
-			Issuer: serverConfig.Issuer,
-		})
-		defer os.Remove(kubeConfigFilename)
-
-		setenv(t, "KUBECONFIG", kubeConfigFilename+string(os.PathListSeparator)+"kubeconfig/testdata/dummy.yaml")
-		defer unsetenv(t, "KUBECONFIG")
-
-		var wg sync.WaitGroup
-		startBrowserRequest(t, ctx, &wg, "http://localhost:8002", nil)
-		runCmd(t, ctx, "--skip-open-browser", "--listen-port", "8002")
-		wg.Wait()
-		kubeconfig.Verify(t, kubeConfigFilename, kubeconfig.AuthProviderConfig{
-			IDToken:      idToken,
-			RefreshToken: "REFRESH_TOKEN",
-		})
-	})
-
-	t.Run("ExtraScopes", func(t *testing.T) {
-		t.Parallel()
-		ctx, cancel := context.WithTimeout(context.Background(), timeout)
-		defer cancel()
-
-		idToken := newIDToken(t, "http://localhost:9003")
-		serverConfig := authserver.Config{
-			Addr:           "localhost:9003",
-			Issuer:         "http://localhost:9003",
-			IDToken:        idToken,
-			IDTokenKeyPair: keys.JWSKeyPair,
-			RefreshToken:   "REFRESH_TOKEN",
-			Scope:          "profile groups openid",
-		}
-		server := authserver.Start(t, serverConfig)
-		defer shutdown(t, ctx, server)
-
-		kubeConfigFilename := kubeconfig.Create(t, &kubeconfig.Values{
-			Issuer:      serverConfig.Issuer,
-			ExtraScopes: "profile,groups",
-		})
-		defer os.Remove(kubeConfigFilename)
-
-		var wg sync.WaitGroup
-		startBrowserRequest(t, ctx, &wg, "http://localhost:8003", nil)
-		runCmd(t, ctx, "--kubeconfig", kubeConfigFilename, "--skip-open-browser", "--listen-port", "8003")
-		wg.Wait()
-		kubeconfig.Verify(t, kubeConfigFilename, kubeconfig.AuthProviderConfig{
-			IDToken:      idToken,
-			RefreshToken: "REFRESH_TOKEN",
-		})
-	})
-
-	t.Run("CACert", func(t *testing.T) {
-		t.Parallel()
-		ctx, cancel := context.WithTimeout(context.Background(), timeout)
-		defer cancel()
-
-		idToken := newIDToken(t, "https://localhost:9004")
-		serverConfig := authserver.Config{
-			Addr:           "localhost:9004",
-			Issuer:         "https://localhost:9004",
-			IDToken:        idToken,
-			IDTokenKeyPair: keys.JWSKeyPair,
-			RefreshToken:   "REFRESH_TOKEN",
-			TLSServerCert:  keys.TLSServerCert,
-			TLSServerKey:   keys.TLSServerKey,
-		}
-		server := authserver.Start(t, serverConfig)
-		defer shutdown(t, ctx, server)
-
-		kubeConfigFilename := kubeconfig.Create(t, &kubeconfig.Values{
-			Issuer:                  serverConfig.Issuer,
-			IDPCertificateAuthority: keys.TLSCACert,
-		})
-		defer os.Remove(kubeConfigFilename)
-
-		var wg sync.WaitGroup
-		startBrowserRequest(t, ctx, &wg, "http://localhost:8004", keys.TLSCACertAsConfig)
-		runCmd(t, ctx, "--kubeconfig", kubeConfigFilename, "--skip-open-browser", "--listen-port", "8004")
-		wg.Wait()
-		kubeconfig.Verify(t, kubeConfigFilename, kubeconfig.AuthProviderConfig{
-			IDToken:      idToken,
-			RefreshToken: "REFRESH_TOKEN",
-		})
-	})
-
-	t.Run("CACertData", func(t *testing.T) {
-		t.Parallel()
-		ctx, cancel := context.WithTimeout(context.Background(), timeout)
-		defer cancel()
-
-		idToken := newIDToken(t, "https://localhost:9005")
-		serverConfig := authserver.Config{
-			Addr:           "localhost:9005",
-			Issuer:         "https://localhost:9005",
-			IDToken:        idToken,
-			IDTokenKeyPair: keys.JWSKeyPair,
-			RefreshToken:   "REFRESH_TOKEN",
-			TLSServerCert:  keys.TLSServerCert,
-			TLSServerKey:   keys.TLSServerKey,
-		}
-		server := authserver.Start(t, serverConfig)
-		defer shutdown(t, ctx, server)
-
-		kubeConfigFilename := kubeconfig.Create(t, &kubeconfig.Values{
-			Issuer:                      serverConfig.Issuer,
-			IDPCertificateAuthorityData: keys.TLSCACertAsBase64,
-		})
-		defer os.Remove(kubeConfigFilename)
-
-		var wg sync.WaitGroup
-		startBrowserRequest(t, ctx, &wg, "http://localhost:8005", keys.TLSCACertAsConfig)
-		runCmd(t, ctx, "--kubeconfig", kubeConfigFilename, "--skip-open-browser", "--listen-port", "8005")
-		wg.Wait()
-		kubeconfig.Verify(t, kubeConfigFilename, kubeconfig.AuthProviderConfig{
-			IDToken:      idToken,
-			RefreshToken: "REFRESH_TOKEN",
-		})
-	})
-
-	t.Run("AlreadyHaveValidToken", func(t *testing.T) {
-		t.Parallel()
-		ctx, cancel := context.WithTimeout(context.Background(), timeout)
-		defer cancel()
-
-		serverConfig := authserver.Config{
-			Addr:           "localhost:9006",
-			Issuer:         "http://localhost:9006",
-			IDTokenKeyPair: keys.JWSKeyPair,
-		}
-		server := authserver.Start(t, serverConfig)
-		defer shutdown(t, ctx, server)
-
-		idToken := newIDToken(t, serverConfig.Issuer)
-		kubeConfigFilename := kubeconfig.Create(t, &kubeconfig.Values{
-			Issuer:  serverConfig.Issuer,
-			IDToken: idToken,
-		})
-		defer os.Remove(kubeConfigFilename)
-
-		runCmd(t, ctx, "--kubeconfig", kubeConfigFilename, "--skip-open-browser")
-		kubeconfig.Verify(t, kubeConfigFilename, kubeconfig.AuthProviderConfig{
-			IDToken: idToken,
-		})
-	})
-}
-
-func newIDToken(t *testing.T, issuer string) string {
-	t.Helper()
-	var claims struct {
-		jwt.StandardClaims
-		Groups []string `json:"groups"`
-	}
-	claims.StandardClaims = jwt.StandardClaims{
-		Issuer:    issuer,
-		Audience:  "kubernetes",
-		ExpiresAt: time.Now().Add(time.Hour).Unix(),
-		Subject:   "SUBJECT",
-		IssuedAt:  time.Now().Unix(),
-	}
-	claims.Groups = []string{"admin", "users"}
-	token := jwt.NewWithClaims(jwt.SigningMethodRS256, claims)
-	s, err := token.SignedString(keys.JWSKeyPair)
-	if err != nil {
-		t.Fatalf("Could not sign the claims: %s", err)
-	}
-	return s
-}
-
-func runCmd(t *testing.T, ctx context.Context, args ...string) {
-	t.Helper()
-	newLogger := func() adaptors.Logger {
-		return logger.New(t)
-	}
-	if err := di.InvokeWithExtra(func(cmd adaptors.Cmd) {
-		exitCode := cmd.Run(ctx, append([]string{"kubelogin", "--v=1"}, args...), "HEAD")
-		if exitCode != 0 {
-			t.Errorf("exit status wants 0 but %d", exitCode)
-		}
-	}, newLogger); err != nil {
-		t.Errorf("Invoke returned error: %+v", err)
-	}
-}
-
-func startBrowserRequest(t *testing.T, ctx context.Context, wg *sync.WaitGroup, url string, tlsConfig *tls.Config) {
-	t.Helper()
-	client := http.Client{Transport: &http.Transport{TLSClientConfig: 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)
-	go func() {
-		defer wg.Done()
-		time.Sleep(50 * time.Millisecond)
-		resp, err := client.Do(req)
-		if err != nil {
-			t.Errorf("could not send a request: %s", err)
-			return
-		}
-		defer resp.Body.Close()
-		if resp.StatusCode != 200 {
-			t.Errorf("StatusCode wants 200 but %d", resp.StatusCode)
-		}
-	}()
-	wg.Add(1)
-}
-
-func shutdown(t *testing.T, ctx context.Context, s *http.Server) {
-	if err := s.Shutdown(ctx); err != nil {
-		t.Errorf("Could not shutdown the auth server: %s", err)
-	}
-}
-
-func setenv(t *testing.T, key, value string) {
-	t.Helper()
-	if err := os.Setenv(key, value); err != nil {
-		t.Fatalf("Could not set the env var %s=%s: %s", key, value, err)
-	}
-}
-
-func unsetenv(t *testing.T, key string) {
-	t.Helper()
-	if err := os.Unsetenv(key); err != nil {
-		t.Fatalf("Could not unset the env var %s: %s", key, err)
-	}
-}

adaptors_test/keys/keys.go

@@ -1,71 +0,0 @@
-package keys
-
-import (
-	"crypto/rsa"
-	"crypto/tls"
-	"crypto/x509"
-	"encoding/base64"
-	"encoding/pem"
-	"io/ioutil"
-
-	"github.com/pkg/errors"
-)
-
-// TLSCACert is path to the CA certificate.
-// This should be generated by Makefile before test.
-const TLSCACert = "keys/testdata/ca.crt"
-
-// TLSCACertAsBase64 is a base64 encoded string of TLSCACert.
-var TLSCACertAsBase64 string
-
-// TLSCACertAsConfig is a TLS config including TLSCACert.
-var TLSCACertAsConfig = &tls.Config{RootCAs: x509.NewCertPool()}
-
-// TLSServerCert is path to the server certificate.
-// This should be generated by Makefile before test.
-const TLSServerCert = "keys/testdata/server.crt"
-
-// TLSServerKey is path to the server key.
-// This should be generated by Makefile before test.
-const TLSServerKey = "keys/testdata/server.key"
-
-// JWSKey is path to the key for signing ID tokens.
-const JWSKey = "keys/testdata/jws.key"
-
-// JWSKeyPair is the key pair loaded from JWSKey.
-var JWSKeyPair *rsa.PrivateKey
-
-func init() {
-	var err error
-	JWSKeyPair, err = readPrivateKey(JWSKey)
-	if err != nil {
-		panic(err)
-	}
-	b, err := ioutil.ReadFile(TLSCACert)
-	if err != nil {
-		panic(err)
-	}
-	TLSCACertAsBase64 = base64.StdEncoding.EncodeToString(b)
-	if !TLSCACertAsConfig.RootCAs.AppendCertsFromPEM(b) {
-		panic("could not append the CA cert")
-	}
-}
-
-func readPrivateKey(name string) (*rsa.PrivateKey, error) {
-	b, err := ioutil.ReadFile(name)
-	if err != nil {
-		return nil, errors.Wrapf(err, "could not read JWSKey")
-	}
-	block, rest := pem.Decode(b)
-	if block == nil {
-		return nil, errors.New("could not decode PEM")
-	}
-	if len(rest) > 0 {
-		return nil, errors.New("PEM should contain single key but multiple keys")
-	}
-	k, err := x509.ParsePKCS1PrivateKey(block.Bytes)
-	if err != nil {
-		return nil, errors.Wrapf(err, "could not parse the key")
-	}
-	return k, nil
-}

adaptors_test/keys/testdata/.gitignore

@@ -1,4 +0,0 @@
-/CA
-*.key
-*.csr
-*.crt

adaptors_test/keys/testdata/Makefile

@@ -1,53 +0,0 @@
-.PHONY: clean
-
-all: server.crt ca.crt jws.key
-
-clean:
-	rm -v ca.* server.*
-
-ca.key:
-	openssl genrsa -out $@ 1024
-
-ca.csr: openssl.cnf ca.key
-	openssl req -config openssl.cnf \
-		-new \
-		-key ca.key \
-		-subj "/CN=Hello CA" \
-		-out $@
-	openssl req -noout -text -in $@
-
-ca.crt: ca.csr ca.key
-	openssl x509 -req \
-		-signkey ca.key \
-		-in ca.csr \
-		-out $@
-	openssl x509 -text -in $@
-
-server.key:
-	openssl genrsa -out $@ 1024
-
-server.csr: openssl.cnf server.key
-	openssl req -config openssl.cnf \
-		-new \
-		-key server.key \
-		-subj "/CN=localhost" \
-		-out $@
-	openssl req -noout -text -in $@
-
-server.crt: openssl.cnf server.csr ca.key ca.crt
-	rm -fr ./CA
-	mkdir -p ./CA
-	touch CA/index.txt
-	touch CA/index.txt.attr
-	echo 00 > CA/serial
-	openssl ca -config openssl.cnf \
-		-extensions v3_req \
-		-batch \
-		-cert ca.crt \
-		-keyfile ca.key \
-		-in server.csr \
-		-out $@
-	openssl x509 -text -in $@
-
-jws.key:
-	openssl genrsa -out $@ 1024

adaptors_test/keys/testdata/openssl.cnf

@@ -1,37 +0,0 @@
-[ ca ]
-default_ca      = CA_default
-
-[ CA_default ]
-dir             = ./CA
-certs           = $dir
-crl_dir         = $dir
-database        = $dir/index.txt
-new_certs_dir   = $dir
-default_md      = sha256
-policy          = policy_match
-serial          = $dir/serial
-default_days    = 365
-
-[ policy_match ]
-countryName             = optional
-stateOrProvinceName     = optional
-organizationName        = optional
-organizationalUnitName  = optional
-commonName              = supplied
-emailAddress            = optional
-
-[ req ]
-distinguished_name	= req_distinguished_name
-req_extensions = v3_req
-x509_extensions = v3_ca
-
-[ req_distinguished_name ]
-commonName			= Common Name (e.g. server FQDN or YOUR name)
-
-[ v3_req ]
-basicConstraints = CA:FALSE
-keyUsage = nonRepudiation, digitalSignature, keyEncipherment
-subjectAltName = DNS:localhost
-
-[ v3_ca ]
-basicConstraints = CA:true

adaptors_test/logger/logger.go

@@ -1,21 +0,0 @@
-package logger
-
-import (
-	"github.com/int128/kubelogin/adaptors"
-)
-
-func New(t testingLogger) *adaptors.Logger {
-	return adaptors.NewLoggerWith(&bridge{t})
-}
-
-type testingLogger interface {
-	Logf(format string, v ...interface{})
-}
-
-type bridge struct {
-	t testingLogger
-}
-
-func (b *bridge) Printf(format string, v ...interface{}) {
-	b.t.Logf(format, v...)
-}

di/di.go

@@ -1,42 +0,0 @@
-// Package di provides dependency injection.
-package di
-
-import (
-	"github.com/int128/kubelogin/adaptors"
-	adaptorsInterfaces "github.com/int128/kubelogin/adaptors/interfaces"
-	"github.com/int128/kubelogin/usecases"
-	"github.com/pkg/errors"
-	"go.uber.org/dig"
-)
-
-var constructors = []interface{}{
-	usecases.NewLogin,
-
-	adaptors.NewCmd,
-	adaptors.NewKubeConfig,
-	adaptors.NewOIDC,
-	adaptors.NewHTTP,
-}
-
-var extraConstructors = []interface{}{
-	adaptors.NewLogger,
-}
-
-// Invoke runs the function with the default constructors.
-func Invoke(f func(cmd adaptorsInterfaces.Cmd)) error {
-	return InvokeWithExtra(f, extraConstructors...)
-}
-
-// InvokeWithExtra runs the function with the given constructors.
-func InvokeWithExtra(f func(cmd adaptorsInterfaces.Cmd), extra ...interface{}) error {
-	c := dig.New()
-	for _, constructor := range append(constructors, extra...) {
-		if err := c.Provide(constructor); err != nil {
-			return errors.Wrapf(err, "could not provide the constructor")
-		}
-	}
-	if err := c.Invoke(f); err != nil {
-		return errors.Wrapf(err, "could not invoke")
-	}
-	return nil
-}

di/di_test.go

@@ -1,18 +0,0 @@
-package di_test
-
-import (
-	"testing"
-
-	adaptors "github.com/int128/kubelogin/adaptors/interfaces"
-	"github.com/int128/kubelogin/di"
-)
-
-func TestInvoke(t *testing.T) {
-	if err := di.Invoke(func(cmd adaptors.Cmd) {
-		if cmd == nil {
-			t.Errorf("cmd wants non-nil but nil")
-		}
-	}); err != nil {
-		t.Fatalf("Invoke returned error: %+v", err)
-	}
-}

dist/Dockerfile

@@ -0,0 +1,13 @@
+FROM alpine:3.11
+
+ARG KUBELOGIN_VERSION="{{ env "VERSION" }}"
+ARG KUBELOGIN_SHA256="{{ sha256 .linux_amd64_archive }}"
+
+# Download the release and test the checksum
+RUN wget -O /kubelogin.zip "https://github.com/int128/kubelogin/releases/download/$KUBELOGIN_VERSION/kubelogin_linux_amd64.zip" && \
+    echo "$KUBELOGIN_SHA256  /kubelogin.zip" | sha256sum -c - && \
+    unzip /kubelogin.zip && \
+    rm /kubelogin.zip
+
+USER daemon
+ENTRYPOINT ["/kubelogin"]

dist/oidc-login.yaml

@@ -0,0 +1,64 @@
+apiVersion: krew.googlecontainertools.github.com/v1alpha2
+kind: Plugin
+metadata:
+  name: oidc-login
+spec:
+  homepage: https://github.com/int128/kubelogin
+  shortDescription: Log in to the OpenID Connect provider
+  description: |
+    This is a kubectl plugin for Kubernetes OpenID Connect (OIDC) authentication.
+
+    ## Credential plugin mode
+    kubectl executes oidc-login before calling the Kubernetes APIs.
+    oidc-login automatically opens the browser and you can log in to the provider.
+    After authentication, kubectl gets the token from oidc-login and you can access the cluster.
+    See https://github.com/int128/kubelogin#credential-plugin-mode for more.
+
+    ## Standalone mode
+    Run `kubectl oidc-login`.
+    It automatically opens the browser and you can log in to the provider.
+    After authentication, it writes the token to the kubeconfig and you can access the cluster.
+    See https://github.com/int128/kubelogin#standalone-mode for more.
+
+  caveats: |
+    You need to setup the OIDC provider, Kubernetes API server, role binding and kubeconfig.
+    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
+      sha256: "{{ sha256 .linux_amd64_archive }}"
+      bin: kubelogin
+      files:
+        - from: kubelogin
+          to: .
+        - from: LICENSE
+          to: .
+      selector:
+        matchLabels:
+          os: linux
+          arch: amd64
+    - uri: https://github.com/int128/kubelogin/releases/download/{{ env "VERSION" }}/kubelogin_darwin_amd64.zip
+      sha256: "{{ sha256 .darwin_amd64_archive }}"
+      bin: kubelogin
+      files:
+        - from: kubelogin
+          to: .
+        - from: LICENSE
+          to: .
+      selector:
+        matchLabels:
+          os: darwin
+          arch: amd64
+    - uri: https://github.com/int128/kubelogin/releases/download/{{ env "VERSION" }}/kubelogin_windows_amd64.zip
+      sha256: "{{ sha256 .windows_amd64_archive }}"
+      bin: kubelogin.exe
+      files:
+        - from: kubelogin.exe
+          to: .
+        - from: LICENSE
+          to: .
+      selector:
+        matchLabels:
+          os: windows
+          arch: amd64

docs/google.md

@@ -1,100 +0,0 @@
-# Getting Started with Google Identity Platform
-
-## Prerequisite
-
-- You have a Google account.
-- You have the Cluster Admin role of the Kubernetes cluster.
-- You can configure the Kubernetes API server.
-- `kubectl` and `kubelogin` are installed to your computer.
-
-## 1. Setup Google API
-
-Open [Google APIs Console](https://console.developers.google.com/apis/credentials) and create an OAuth client with the following setting:
-
-- Application Type: Other
-
-## 2. Setup Kubernetes API server
-
-Configure your Kubernetes API Server accepts [OpenID Connect Tokens](https://kubernetes.io/docs/reference/access-authn-authz/authentication/#openid-connect-tokens).
-
-### kops
-
-If you are using [kops](https://github.com/kubernetes/kops), run `kops edit cluster` and append the following settings:
-
-```yaml
-spec:
-  kubeAPIServer:
-    oidcIssuerURL: https://accounts.google.com
-    oidcClientID: YOUR_CLIENT_ID.apps.googleusercontent.com
-```
-
-## 3. Setup Kubernetes cluster
-
-Here assign the `cluster-admin` role to you.
-
-```yaml
-kind: ClusterRoleBinding
-apiVersion: rbac.authorization.k8s.io/v1
-metadata:
-  name: oidc-admin-group
-roleRef:
-  apiGroup: rbac.authorization.k8s.io
-  kind: ClusterRole
-  name: cluster-admin
-subjects:
-- kind: User
-  name: https://accounts.google.com#1234567890
-```
-
-You can create a custom role and assign it as well.
-
-## 4. Setup kubectl
-
-Configure `kubectl` for the OIDC authentication.
-
-```sh
-kubectl config set-credentials NAME \
-  --auth-provider oidc \
-  --auth-provider-arg idp-issuer-url=https://accounts.google.com \
-  --auth-provider-arg client-id=YOUR_CLIENT_ID.apps.googleusercontent.com \
-  --auth-provider-arg client-secret=YOUR_CLIENT_SECRET
-```
-
-## 5. Run kubelogin
-
-Run `kubelogin`.
-
-```
-% kubelogin
-2018/08/10 10:36:38 Reading .kubeconfig
-2018/08/10 10:36:38 Using current context: hello.k8s.local
-2018/08/10 10:36:41 Open http://localhost:8000 for authorization
-2018/08/10 10:36:45 GET /
-2018/08/10 10:37:07 GET /?state=...&session_state=...&code=ey...
-2018/08/10 10:37:08 Updated .kubeconfig
-```
-
-Now your `~/.kube/config` should be like:
-
-```yaml
-users:
-- name: hello.k8s.local
-  user:
-    auth-provider:
-      config:
-        idp-issuer-url: https://accounts.google.com
-        client-id: YOUR_CLIENT_ID.apps.googleusercontent.com
-        client-secret: YOUR_SECRET
-        id-token: ey...       # kubelogin will update ID token here
-        refresh-token: ey...  # kubelogin will update refresh token here
-      name: oidc
-```
-
-Make sure you can access to the Kubernetes cluster.
-
-```
-% kubectl get nodes
-NAME                                    STATUS    ROLES     AGE       VERSION
-ip-1-2-3-4.us-west-2.compute.internal   Ready     node      21d       v1.9.6
-ip-1-2-3-5.us-west-2.compute.internal   Ready     node      20d       v1.9.6
-```

docs/keycloak.md

@@ -1,114 +0,0 @@
-# Getting Started with Keycloak
-
-## Prerequisite
-
-- You have an administrator role of the Keycloak realm.
-- You have an administrator role of the Kubernetes cluster.
-- You can configure the Kubernetes API server.
-- `kubectl` and `kubelogin` are installed.
-
-## 1. Setup Keycloak
-
-Open the Keycloak and create an OIDC client as follows:
-
-- Client ID: `kubernetes`
-- Valid Redirect URLs:
-    - `http://localhost:8000`
-    - `http://localhost:18000` (used if the port 8000 is already in use)
-- Issuer URL: `https://keycloak.example.com/auth/realms/YOUR_REALM`
-
-You can associate client roles by adding the following mapper:
-
-- Name: `groups`
-- Mapper Type: `User Client Role`
-- Client ID: `kubernetes`
-- Client Role prefix: `kubernetes:`
-- Token Claim Name: `groups`
-- Add to ID token: on
-
-For example, if you have the `admin` role of the client, you will get a JWT with the claim `{"groups": ["kubernetes:admin"]}`.
-
-## 2. Setup Kubernetes API server
-
-Configure your Kubernetes API server accepts [OpenID Connect Tokens](https://kubernetes.io/docs/reference/access-authn-authz/authentication/#openid-connect-tokens).
-
-If you are using [kops](https://github.com/kubernetes/kops), run `kops edit cluster` and add the following spec:
-
-```yaml
-spec:
-  kubeAPIServer:
-    oidcIssuerURL: https://keycloak.example.com/auth/realms/YOUR_REALM
-    oidcClientID: kubernetes
-    oidcGroupsClaim: groups
-```
-
-## 3. Setup Kubernetes cluster
-
-Here assign the `cluster-admin` role to the `kubernetes:admin` group.
-
-```yaml
-kind: ClusterRoleBinding
-apiVersion: rbac.authorization.k8s.io/v1
-metadata:
-  name: keycloak-admin-group
-roleRef:
-  apiGroup: rbac.authorization.k8s.io
-  kind: ClusterRole
-  name: cluster-admin
-subjects:
-- kind: Group
-  name: kubernetes:admin
-```
-
-You can create a custom role and assign it as well.
-
-## 4. Setup kubectl
-
-Configure `kubectl` for the OIDC authentication.
-
-```sh
-kubectl config set-credentials NAME \
-  --auth-provider oidc \
-  --auth-provider-arg idp-issuer-url=https://keycloak.example.com/auth/realms/YOUR_REALM \
-  --auth-provider-arg client-id=kubernetes \
-  --auth-provider-arg client-secret=YOUR_CLIENT_SECRET
-```
-
-## 5. Run kubelogin
-
-Run `kubelogin`.
-
-```
-% kubelogin
-2018/08/10 10:36:38 Reading .kubeconfig
-2018/08/10 10:36:38 Using current context: hello.k8s.local
-2018/08/10 10:36:41 Open http://localhost:8000 for authorization
-2018/08/10 10:36:45 GET /
-2018/08/10 10:37:07 GET /?state=...&session_state=...&code=ey...
-2018/08/10 10:37:08 Updated .kubeconfig
-```
-
-Now your `~/.kube/config` should be like:
-
-```yaml
-users:
-- name: hello.k8s.local
-  user:
-    auth-provider:
-      config:
-        idp-issuer-url: https://keycloak.example.com/auth/realms/YOUR_REALM
-        client-id: kubernetes
-        client-secret: YOUR_SECRET
-        id-token: ey...       # kubelogin will update ID token here
-        refresh-token: ey...  # kubelogin will update refresh token here
-      name: oidc
-```
-
-Make sure you can access to the Kubernetes cluster.
-
-```
-% kubectl get nodes
-NAME                                    STATUS    ROLES     AGE       VERSION
-ip-1-2-3-4.us-west-2.compute.internal   Ready     node      21d       v1.9.6
-ip-1-2-3-5.us-west-2.compute.internal   Ready     node      20d       v1.9.6
-```

docs/setup.md

@@ -0,0 +1,238 @@
+# Kubernetes OpenID Connection authentication
+
+This document guides how to set up Kubernetes OpenID Connect (OIDC) authentication.
+Let's see the following steps:
+
+1. Set up the OIDC provider
+1. Verify authentication
+1. Bind a cluster role
+1. Set up the Kubernetes API server
+1. Set up the kubeconfig
+1. Verify cluster access
+
+
+## 1. Set up the OIDC provider
+
+### Google Identity Platform
+
+You can log in with a Google account.
+
+Open [Google APIs Console](https://console.developers.google.com/apis/credentials) and create an OAuth client with the following setting:
+
+- Application Type: Other
+
+Check the client ID and secret.
+Replace the following variables in the later sections.
+
+Variable                | Value
+------------------------|------
+`ISSUER_URL`            | `https://accounts.google.com`
+`YOUR_CLIENT_ID`        | `xxx.apps.googleusercontent.com`
+`YOUR_CLIENT_SECRET`    | random string
+
+### Keycloak
+
+You can log in with a user of Keycloak.
+Make sure you have an administrator role of the Keycloak realm.
+
+Open Keycloak and create an OIDC client as follows:
+
+- Client ID: `YOUR_CLIENT_ID`
+- Valid Redirect URLs:
+    - `http://localhost:8000`
+    - `http://localhost:18000` (used if the port 8000 is already in use)
+- Issuer URL: `https://keycloak.example.com/auth/realms/YOUR_REALM`
+
+You can associate client roles by adding the following mapper:
+
+- Name: `groups`
+- Mapper Type: `User Client Role`
+- Client ID: `YOUR_CLIENT_ID`
+- Client Role prefix: `kubernetes:`
+- Token Claim Name: `groups`
+- Add to ID token: on
+
+For example, if you have `admin` role of the client, you will get a JWT with the claim `{"groups": ["kubernetes:admin"]}`.
+
+Replace the following variables in the later sections.
+
+Variable                | Value
+------------------------|------
+`ISSUER_URL`            | `https://keycloak.example.com/auth/realms/YOUR_REALM`
+`YOUR_CLIENT_ID`        | `YOUR_CLIENT_ID`
+`YOUR_CLIENT_SECRET`    | random string
+
+### Dex with GitHub
+
+You can log in with a GitHub account.
+
+Open [GitHub OAuth Apps](https://github.com/settings/developers) and create an application with the following setting:
+
+- Application name: (any)
+- Homepage URL: `https://dex.example.com`
+- Authorization callback URL: `https://dex.example.com/callback`
+
+Deploy [Dex](https://github.com/dexidp/dex) with the following config:
+
+```yaml
+issuer: https://dex.example.com
+connectors:
+- type: github
+  id: github
+  name: GitHub
+  config:
+    clientID: YOUR_GITHUB_CLIENT_ID
+    clientSecret: YOUR_GITHUB_CLIENT_SECRET
+    redirectURI: https://dex.example.com/callback
+staticClients:
+- id: YOUR_CLIENT_ID
+  name: Kubernetes
+  redirectURIs:
+  - http://localhost:8000
+  - http://localhost:18000
+  secret: YOUR_DEX_CLIENT_SECRET
+```
+
+Replace the following variables in the later sections.
+
+Variable                | Value
+------------------------|------
+`ISSUER_URL`            | `https://dex.example.com`
+`YOUR_CLIENT_ID`        | `YOUR_CLIENT_ID`
+`YOUR_CLIENT_SECRET`    | `YOUR_DEX_CLIENT_SECRET`
+
+### Okta
+
+You can log in with an Okta user.
+Okta supports [the authorization code flow with PKCE](https://developer.okta.com/docs/guides/implement-auth-code-pkce/overview/)
+and this section explains how to set up it.
+
+Open your Okta organization and create an application with the following options:
+
+- Application type: Native
+- Initiate login URI: `http://localhost:8000`
+- Login redirect URIs:
+    - `http://localhost:8000`
+    - `http://localhost:18000` (used if the port 8000 is already in use)
+- Allowed grant types: Authorization Code
+- Client authentication: Use PKCE (for public clients)
+
+Replace the following variables in the later sections.
+
+Variable                | Value
+------------------------|------
+`ISSUER_URL`            | `https://YOUR_ORGANIZATION.okta.com`
+`YOUR_CLIENT_ID`        | random string
+
+You do not need to set `YOUR_CLIENT_SECRET`.
+
+
+## 2. Verify authentication
+
+Run the following command:
+
+```sh
+kubectl oidc-login setup \
+  --oidc-issuer-url=ISSUER_URL \
+  --oidc-client-id=YOUR_CLIENT_ID \
+  --oidc-client-secret=YOUR_CLIENT_SECRET
+```
+
+It launches the browser and navigates to `http://localhost:8000`.
+Please log in to the provider.
+
+You can set extra options, for example, extra scope or CA certificate.
+See also the full options.
+
+```sh
+kubectl oidc-login setup --help
+```
+
+
+## 3. Bind a cluster role
+
+Here bind `cluster-admin` role to you.
+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
+```
+
+As well as you can create a custom cluster role and bind it.
+
+
+## 4. Set up the Kubernetes API server
+
+Add the following flags to kube-apiserver:
+
+```
+--oidc-issuer-url=ISSUER_URL
+--oidc-client-id=YOUR_CLIENT_ID
+```
+
+See [Kubernetes Authenticating: OpenID Connect Tokens](https://kubernetes.io/docs/reference/access-authn-authz/authentication/#openid-connect-tokens) for the all flags.
+
+If you are using [kops](https://github.com/kubernetes/kops), run `kops edit cluster` and append the following settings:
+
+```yaml
+spec:
+  kubeAPIServer:
+    oidcIssuerURL: ISSUER_URL
+    oidcClientID: YOUR_CLIENT_ID
+```
+
+If you are using [kube-aws](https://github.com/kubernetes-incubator/kube-aws), append the following settings to the `cluster.yaml`:
+
+```yaml
+       oidc:
+         enabled: true
+         issuerUrl: ISSUER_URL
+         clientId: YOUR_CLIENT_ID
+```
+
+
+## 5. Set up the kubeconfig
+
+Add `oidc` user to the kubeconfig.
+
+```sh
+kubectl config set-credentials oidc \
+  --exec-api-version=client.authentication.k8s.io/v1beta1 \
+  --exec-command=kubectl \
+  --exec-arg=oidc-login \
+  --exec-arg=get-token \
+  --exec-arg=--oidc-issuer-url=ISSUER_URL \
+  --exec-arg=--oidc-client-id=YOUR_CLIENT_ID \
+  --exec-arg=--oidc-client-secret=YOUR_CLIENT_SECRET
+```
+
+
+## 6. Verify cluster access
+
+Make sure you can access the Kubernetes cluster.
+
+```sh
+kubectl --user=oidc cluster-info
+```
+
+You can switch the current context to oidc.
+
+```sh
+kubectl config set-context --current --user=oidc
+```
+
+You can share the kubeconfig to your team members for on-boarding.

docs/standalone-mode.md

@@ -0,0 +1,180 @@
+# Standalone mode
+
+You can run kubelogin as a standalone command.
+In this mode, you need to manually run the command before running kubectl.
+
+Configure the kubeconfig like:
+
+```yaml
+- name: keycloak
+  user:
+    auth-provider:
+      config:
+        client-id: YOUR_CLIENT_ID
+        client-secret: YOUR_CLIENT_SECRET
+        idp-issuer-url: https://issuer.example.com
+      name: oidc
+```
+
+Run kubelogin:
+
+```sh
+kubelogin
+
+# or run as a kubectl plugin
+kubectl oidc-login
+```
+
+It automatically opens the browser and you can log in to the provider.
+
+<img src="keycloak-login.png" alt="keycloak-login" width="455" height="329">
+
+After authentication, kubelogin writes the ID token and refresh token to the kubeconfig.
+
+```
+% kubelogin
+Open http://localhost:8000 for authentication
+You got a valid token until 2019-05-18 10:28:51 +0900 JST
+Updated ~/.kubeconfig
+```
+
+Now you can access the cluster.
+
+```
+% kubectl get pods
+NAME                          READY   STATUS    RESTARTS   AGE
+echoserver-86c78fdccd-nzmd5   1/1     Running   0          26d
+```
+
+Your kubeconfig looks like:
+
+```yaml
+users:
+- name: keycloak
+  user:
+    auth-provider:
+      config:
+        client-id: YOUR_CLIENT_ID
+        client-secret: YOUR_CLIENT_SECRET
+        idp-issuer-url: https://issuer.example.com
+        id-token: ey...       # kubelogin will add or update the ID token here
+        refresh-token: ey...  # kubelogin will add or update the refresh token here
+      name: oidc
+```
+
+If the ID token is valid, kubelogin does nothing.
+
+```
+% kubelogin
+You already have a valid token until 2019-05-18 10:28:51 +0900 JST
+```
+
+If the ID token has expired, kubelogin will refresh the token using the refresh token in the kubeconfig.
+If the refresh token has expired, kubelogin will proceed the authentication.
+
+
+## Usage
+
+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.
+It defaults to `~/.kube/config`.
+
+```sh
+# by the option
+kubelogin --kubeconfig /path/to/kubeconfig
+
+# by the environment variable
+KUBECONFIG="/path/to/kubeconfig1:/path/to/kubeconfig2" kubelogin
+```
+
+If you set multiple files, kubelogin will find the file which has the current authentication (i.e. `user` and `auth-provider`) and write a token to it.
+
+Kubelogin supports the following keys of `auth-provider` in a kubeconfig.
+See [kubectl authentication](https://kubernetes.io/docs/reference/access-authn-authz/authentication/#using-kubectl) for more.
+
+Key | Direction | Value
+----|-----------|------
+`idp-issuer-url`                  | Read (Mandatory) | Issuer URL of the provider.
+`client-id`                       | Read (Mandatory) | Client ID of the provider.
+`client-secret`                   | Read (Mandatory) | Client Secret of the provider.
+`idp-certificate-authority`       | Read | CA certificate path of the provider.
+`idp-certificate-authority-data`  | Read | Base64 encoded CA certificate of the provider.
+`extra-scopes`                    | Read | Scopes to request to the provider (comma separated).
+`id-token`                        | Write | ID token got from the provider.
+`refresh-token`                   | Write | Refresh token got from the provider.
+
+### Extra scopes
+
+You can set the extra scopes to request to the provider by `extra-scopes` in the kubeconfig.
+
+```sh
+kubectl config set-credentials keycloak --auth-provider-arg extra-scopes=email
+```
+
+Currently kubectl does not accept multiple scopes, so you need to edit the kubeconfig as like:
+
+```sh
+kubectl config set-credentials keycloak --auth-provider-arg extra-scopes=SCOPES
+sed -i '' -e s/SCOPES/email,profile/ $KUBECONFIG
+```
+
+### CA Certificates
+
+You can use your self-signed certificates for the provider.
+
+```sh
+kubectl config set-credentials keycloak \
+  --auth-provider-arg idp-certificate-authority=$HOME/.kube/keycloak-ca.pem
+```

docs/team_ops.md

@@ -1,40 +0,0 @@
-# Team Operation
-
-## kops
-
-Export the kubeconfig.
-
-```sh
-KUBECONFIG=.kubeconfig kops export kubecfg hello.k8s.local
-```
-
-Remove the `admin` access from the kubeconfig.
-It should look as like:
-
-```yaml
-apiVersion: v1
-kind: Config
-clusters:
-  - cluster:
-      certificate-authority-data: LS...
-      server: https://api.hello.k8s.example.com
-      name: hello.k8s.local
-contexts:
-- context:
-    cluster: hello.k8s.local
-    user: hello.k8s.local
-  name: hello.k8s.local
-current-context: hello.k8s.local
-preferences: {}
-users:
-- name: hello.k8s.local
-  user:
-    auth-provider:
-      name: oidc
-      config:
-        client-id: YOUR_CLIEND_ID
-        client-secret: YOUR_CLIENT_SECRET
-        idp-issuer-url: YOUR_ISSUER
-```
-
-You can share the kubeconfig to your team members for easy onboarding.

go.mod

@@ -1,30 +1,26 @@
 module github.com/int128/kubelogin
 
+go 1.12
+
 require (
-	github.com/coreos/go-oidc v2.0.0+incompatible
-	github.com/davecgh/go-spew v1.1.1 // indirect
+	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/gogo/protobuf v1.2.1 // indirect
-	github.com/golang/mock v1.3.1
-	github.com/google/gofuzz v0.0.0-20170612174753-24818f796faf // indirect
-	github.com/imdario/mergo v0.3.7 // indirect
-	github.com/int128/oauth2cli v1.4.0
-	github.com/json-iterator/go v1.1.6 // indirect
-	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
-	github.com/modern-go/reflect2 v1.0.1 // indirect
-	github.com/pkg/errors v0.8.1
+	github.com/golang/mock v1.4.0
+	github.com/google/go-cmp v0.4.0
+	github.com/google/wire v0.4.0
+	github.com/int128/oauth2cli v1.8.1
+	github.com/pkg/browser v0.0.0-20180916011732-0a3d74bf9ce4
 	github.com/pquerna/cachecontrol v0.0.0-20180517163645-1555304b9b35 // indirect
-	github.com/spf13/pflag v1.0.3
-	github.com/stretchr/testify v1.3.0 // indirect
-	go.uber.org/dig v1.7.0
-	golang.org/x/oauth2 v0.0.0-20190319182350-c85d3e98c914
-	golang.org/x/time v0.0.0-20190308202827-9d24e82272b4 // indirect
-	gopkg.in/inf.v0 v0.9.1 // indirect
-	gopkg.in/square/go-jose.v2 v2.3.0 // indirect
-	gopkg.in/yaml.v2 v2.2.2
-	k8s.io/api v0.0.0-20190222213804-5cb15d344471 // indirect
-	k8s.io/apimachinery v0.0.0-20190221213512-86fb29eff628 // indirect
-	k8s.io/client-go v10.0.0+incompatible
-	k8s.io/klog v0.2.0 // indirect
-	sigs.k8s.io/yaml v1.1.0 // indirect
+	github.com/spf13/cobra v0.0.5
+	github.com/spf13/pflag v1.0.5
+	golang.org/x/crypto v0.0.0-20190820162420-60c769a6c586
+	golang.org/x/oauth2 v0.0.0-20190604053449-0f29369cfe45
+	golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e
+	golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543
+	gopkg.in/square/go-jose.v2 v2.3.1 // indirect
+	gopkg.in/yaml.v2 v2.2.8
+	k8s.io/apimachinery v0.17.2
+	k8s.io/client-go v0.17.2
+	k8s.io/klog v1.0.0
 )

go.sum

@@ -1,82 +1,278 @@
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+github.com/Azure/go-autorest/autorest v0.9.0/go.mod h1:xyHB1BMZT0cuDHU7I0+g046+BFDTQ8rEZB0s4Yfa6bI=
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+rsc.io/quote/v3 v3.1.0 h1:9JKUTTIUgS6kzR9mK1YuGKv6Nl+DijDNIc0ghT58FaY=
+rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
+rsc.io/sampler v1.3.0 h1:7uVkIFmeBqHfdjD+gZwtXXI+RODJ2Wc4O7MPEh/QiW4=
+rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=
+sigs.k8s.io/structured-merge-diff v0.0.0-20190525122527-15d366b2352e/go.mod h1:wWxsB5ozmmv/SG7nM11ayaAW51xMvak/t1r0CSlcokI=
 sigs.k8s.io/yaml v1.1.0 h1:4A07+ZFc2wgJwo8YNlQpr1rVlgUDlxXHhPJciaPY5gs=
 sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o=

infrastructure/http.go

@@ -1,50 +0,0 @@
-package infrastructure
-
-import (
-	"net/http"
-	"net/http/httputil"
-
-	"github.com/int128/kubelogin/adaptors/interfaces"
-)
-
-const (
-	logLevelDumpHeaders = 2
-	logLevelDumpBody    = 3
-)
-
-type LoggingTransport struct {
-	Base   http.RoundTripper
-	Logger adaptors.Logger
-}
-
-func (t *LoggingTransport) RoundTrip(req *http.Request) (*http.Response, error) {
-	if !t.IsDumpEnabled() {
-		return t.Base.RoundTrip(req)
-	}
-
-	reqDump, err := httputil.DumpRequestOut(req, t.IsDumpBodyEnabled())
-	if err != nil {
-		t.Logger.Debugf(logLevelDumpHeaders, "Error: could not dump the request: %s", err)
-		return t.Base.RoundTrip(req)
-	}
-	t.Logger.Debugf(logLevelDumpHeaders, "%s", string(reqDump))
-	resp, err := t.Base.RoundTrip(req)
-	if err != nil {
-		return resp, err
-	}
-	respDump, err := httputil.DumpResponse(resp, t.IsDumpBodyEnabled())
-	if err != nil {
-		t.Logger.Debugf(logLevelDumpHeaders, "Error: could not dump the response: %s", err)
-		return resp, err
-	}
-	t.Logger.Debugf(logLevelDumpHeaders, "%s", string(respDump))
-	return resp, err
-}
-
-func (t *LoggingTransport) IsDumpEnabled() bool {
-	return t.Logger.IsEnabled(logLevelDumpHeaders)
-}
-
-func (t *LoggingTransport) IsDumpBodyEnabled() bool {
-	return t.Logger.IsEnabled(logLevelDumpBody)
-}

infrastructure/http_test.go

@@ -1,90 +0,0 @@
-package infrastructure
-
-import (
-	"bufio"
-	"net/http"
-	"net/http/httptest"
-	"strings"
-	"testing"
-
-	"github.com/golang/mock/gomock"
-	"github.com/int128/kubelogin/adaptors/interfaces"
-	"github.com/int128/kubelogin/adaptors/mock_adaptors"
-)
-
-type mockTransport struct {
-	req  *http.Request
-	resp *http.Response
-}
-
-func (t *mockTransport) RoundTrip(req *http.Request) (*http.Response, error) {
-	t.req = req
-	return t.resp, nil
-}
-
-func TestLoggingTransport_RoundTrip(t *testing.T) {
-	ctrl := gomock.NewController(t)
-	defer ctrl.Finish()
-
-	logger := mock_adaptors.NewLogger(t, ctrl)
-	logger.EXPECT().
-		IsEnabled(gomock.Any()).
-		Return(true).
-		AnyTimes()
-
-	req := httptest.NewRequest("GET", "http://example.com/hello", nil)
-	resp, err := http.ReadResponse(bufio.NewReader(strings.NewReader(`HTTP/1.1 200 OK
-Host: example.com
-
-dummy`)), req)
-	if err != nil {
-		t.Errorf("could not create a response: %s", err)
-	}
-	defer resp.Body.Close()
-
-	transport := &LoggingTransport{
-		Base:   &mockTransport{resp: resp},
-		Logger: logger,
-	}
-	gotResp, err := transport.RoundTrip(req)
-	if err != nil {
-		t.Errorf("RoundTrip error: %s", err)
-	}
-	if gotResp != resp {
-		t.Errorf("resp wants %v but %v", resp, gotResp)
-	}
-}
-
-func TestLoggingTransport_IsDumpEnabled(t *testing.T) {
-	ctrl := gomock.NewController(t)
-	defer ctrl.Finish()
-
-	logger := mock_adaptors.NewLogger(t, ctrl)
-	logger.EXPECT().
-		IsEnabled(adaptors.LogLevel(logLevelDumpHeaders)).
-		Return(true)
-
-	transport := &LoggingTransport{
-		Logger: logger,
-	}
-	if transport.IsDumpEnabled() != true {
-		t.Errorf("IsDumpEnabled wants true")
-	}
-}
-
-func TestLoggingTransport_IsDumpBodyEnabled(t *testing.T) {
-	ctrl := gomock.NewController(t)
-	defer ctrl.Finish()
-
-	logger := mock_adaptors.NewLogger(t, ctrl)
-	logger.EXPECT().
-		IsEnabled(adaptors.LogLevel(logLevelDumpBody)).
-		Return(true)
-
-	transport := &LoggingTransport{
-		Logger: logger,
-	}
-	if transport.IsDumpBodyEnabled() != true {
-		t.Errorf("IsDumpBodyEnabled wants true")
-	}
-}

integration_test/credetial_plugin_test.go

@@ -0,0 +1,318 @@
+package integration_test
+
+import (
+	"context"
+	"io/ioutil"
+	"os"
+	"testing"
+	"time"
+
+	"github.com/golang/mock/gomock"
+	"github.com/google/go-cmp/cmp"
+	"github.com/int128/kubelogin/integration_test/idp"
+	"github.com/int128/kubelogin/integration_test/idp/mock_idp"
+	"github.com/int128/kubelogin/integration_test/keys"
+	"github.com/int128/kubelogin/integration_test/localserver"
+	"github.com/int128/kubelogin/pkg/adaptors/browser"
+	"github.com/int128/kubelogin/pkg/adaptors/browser/mock_browser"
+	"github.com/int128/kubelogin/pkg/adaptors/credentialpluginwriter"
+	"github.com/int128/kubelogin/pkg/adaptors/credentialpluginwriter/mock_credentialpluginwriter"
+	"github.com/int128/kubelogin/pkg/adaptors/logger/mock_logger"
+	"github.com/int128/kubelogin/pkg/adaptors/tokencache"
+	"github.com/int128/kubelogin/pkg/di"
+)
+
+// Run the integration tests of the credential plugin use-case.
+//
+// 1. Start the auth server.
+// 2. Run the Cmd.
+// 3. Open a request for the local server.
+// 4. Verify the output.
+//
+func TestCredentialPlugin(t *testing.T) {
+	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)
+		}
+	}()
+
+	t.Run("NoTLS", func(t *testing.T) {
+		testCredentialPlugin(t, credentialPluginTestCase{
+			TokenCacheDir: tokenCacheDir,
+			Keys:          keys.None,
+			ExtraArgs: []string{
+				"--token-cache-dir", tokenCacheDir,
+			},
+		})
+	})
+	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,
+				},
+			})
+		})
+	})
+}
+
+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.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",
+		})
+
+		args := []string{
+			"--oidc-issuer-url", serverURL,
+			"--oidc-client-id", "kubernetes",
+		}
+		args = append(args, tc.ExtraArgs...)
+		runGetTokenCmd(t, ctx, browserMock, writerMock, args)
+		assertTokenCache(t, tc, serverURL, tokencache.Value{
+			IDToken:      idToken,
+			RefreshToken: "YOUR_REFRESH_TOKEN",
+		})
+	})
+
+	t.Run("HasValidRefreshToken", func(t *testing.T) {
+		t.Parallel()
+		ctx, cancel := context.WithTimeout(context.TODO(), timeout)
+		defer cancel()
+		ctrl := gomock.NewController(t)
+		defer ctrl.Finish()
+
+		provider := mock_idp.NewMockProvider(ctrl)
+		serverURL, server := localserver.Start(t, idp.NewHandler(t, provider), tc.Keys)
+		defer server.Shutdown(t, ctx)
+		validIDToken := newIDToken(t, serverURL, "YOUR_NONCE", tokenExpiryFuture)
+		expiredIDToken := newIDToken(t, serverURL, "YOUR_NONCE", tokenExpiryPast)
+
+		provider.EXPECT().Discovery().Return(idp.NewDiscoveryResponse(serverURL))
+		provider.EXPECT().GetCertificates().Return(idp.NewCertificatesResponse(keys.JWSKeyPair))
+		provider.EXPECT().Refresh("VALID_REFRESH_TOKEN").
+			Return(idp.NewTokenResponse(validIDToken, "NEW_REFRESH_TOKEN"), nil)
+
+		setupTokenCache(t, tc, serverURL, tokencache.Value{
+			IDToken:      expiredIDToken,
+			RefreshToken: "VALID_REFRESH_TOKEN",
+		})
+		writerMock := newCredentialPluginWriterMock(t, ctrl, &validIDToken)
+		browserMock := mock_browser.NewMockInterface(ctrl)
+
+		args := []string{
+			"--oidc-issuer-url", serverURL,
+			"--oidc-client-id", "kubernetes",
+		}
+		args = append(args, tc.ExtraArgs...)
+		runGetTokenCmd(t, ctx, browserMock, writerMock, args)
+		assertTokenCache(t, tc, serverURL, tokencache.Value{
+			IDToken:      validIDToken,
+			RefreshToken: "NEW_REFRESH_TOKEN",
+		})
+	})
+
+	t.Run("HasExpiredRefreshToken", func(t *testing.T) {
+		t.Parallel()
+		ctx, cancel := context.WithTimeout(context.TODO(), timeout)
+		defer cancel()
+		ctrl := gomock.NewController(t)
+		defer ctrl.Finish()
+
+		provider := mock_idp.NewMockProvider(ctrl)
+		serverURL, server := localserver.Start(t, idp.NewHandler(t, provider), tc.Keys)
+		defer server.Shutdown(t, ctx)
+		validIDToken := newIDToken(t, serverURL, "YOUR_NONCE", tokenExpiryFuture)
+		expiredIDToken := newIDToken(t, serverURL, "YOUR_NONCE", tokenExpiryPast)
+
+		setupAuthCodeFlow(t, provider, serverURL, "openid", &validIDToken)
+		provider.EXPECT().Refresh("EXPIRED_REFRESH_TOKEN").
+			Return(nil, &idp.ErrorResponse{Code: "invalid_request", Description: "token has expired"}).
+			MaxTimes(2) // package oauth2 will retry refreshing the token
+
+		setupTokenCache(t, tc, serverURL, tokencache.Value{
+			IDToken:      expiredIDToken,
+			RefreshToken: "EXPIRED_REFRESH_TOKEN",
+		})
+		writerMock := newCredentialPluginWriterMock(t, ctrl, &validIDToken)
+		browserMock := newBrowserMock(ctx, t, ctrl, tc.Keys)
+
+		args := []string{
+			"--oidc-issuer-url", serverURL,
+			"--oidc-client-id", "kubernetes",
+		}
+		args = append(args, tc.ExtraArgs...)
+		runGetTokenCmd(t, ctx, browserMock, writerMock, args)
+		assertTokenCache(t, tc, serverURL, tokencache.Value{
+			IDToken:      validIDToken,
+			RefreshToken: "YOUR_REFRESH_TOKEN",
+		})
+	})
+
+	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()
+
+		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)
+
+		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)
+	})
+}
+
+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
+}
+
+func runGetTokenCmd(t *testing.T, ctx context.Context, b browser.Interface, w credentialpluginwriter.Interface, args []string) {
+	t.Helper()
+	cmd := di.NewCmdForHeadless(mock_logger.New(t), b, w)
+	exitCode := cmd.Run(ctx, append([]string{
+		"kubelogin", "get-token",
+		"--v=1",
+		"--listen-address", "127.0.0.1:0",
+	}, args...), "HEAD")
+	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)
+	}
+}

integration_test/helpers_test.go

@@ -0,0 +1,93 @@
+package integration_test
+
+import (
+	"context"
+	"net/http"
+	"testing"
+	"time"
+
+	"github.com/dgrijalva/jwt-go"
+	"github.com/golang/mock/gomock"
+	"github.com/int128/kubelogin/integration_test/idp"
+	"github.com/int128/kubelogin/integration_test/idp/mock_idp"
+	"github.com/int128/kubelogin/integration_test/keys"
+	"github.com/int128/kubelogin/pkg/adaptors/browser"
+	"github.com/int128/kubelogin/pkg/adaptors/browser/mock_browser"
+)
+
+var (
+	tokenExpiryFuture = time.Now().Add(time.Hour).Round(time.Second)
+	tokenExpiryPast   = time.Now().Add(-time.Hour).Round(time.Second)
+)
+
+func newIDToken(t *testing.T, issuer, nonce string, expiry time.Time) string {
+	t.Helper()
+	var claims struct {
+		jwt.StandardClaims
+		Nonce  string   `json:"nonce"`
+		Groups []string `json:"groups"`
+	}
+	claims.StandardClaims = jwt.StandardClaims{
+		Issuer:    issuer,
+		Audience:  "kubernetes",
+		Subject:   "SUBJECT",
+		IssuedAt:  time.Now().Unix(),
+		ExpiresAt: expiry.Unix(),
+	}
+	claims.Nonce = nonce
+	claims.Groups = []string{"admin", "users"}
+	token := jwt.NewWithClaims(jwt.SigningMethodRS256, claims)
+	s, err := token.SignedString(keys.JWSKeyPair)
+	if err != nil {
+		t.Fatalf("Could not sign the claims: %s", err)
+	}
+	return s
+}
+
+func setupAuthCodeFlow(t *testing.T, provider *mock_idp.MockProvider, serverURL, scope string, idToken *string) {
+	var nonce string
+	provider.EXPECT().Discovery().Return(idp.NewDiscoveryResponse(serverURL))
+	provider.EXPECT().GetCertificates().Return(idp.NewCertificatesResponse(keys.JWSKeyPair))
+	provider.EXPECT().AuthenticateCode(scope, gomock.Any()).
+		DoAndReturn(func(_, gotNonce string) (string, error) {
+			nonce = gotNonce
+			return "YOUR_AUTH_CODE", nil
+		})
+	provider.EXPECT().Exchange("YOUR_AUTH_CODE").
+		DoAndReturn(func(string) (*idp.TokenResponse, error) {
+			*idToken = newIDToken(t, serverURL, nonce, tokenExpiryFuture)
+			return idp.NewTokenResponse(*idToken, "YOUR_REFRESH_TOKEN"), nil
+		})
+}
+
+func setupROPCFlow(provider *mock_idp.MockProvider, serverURL, scope, username, password, idToken string) {
+	provider.EXPECT().Discovery().Return(idp.NewDiscoveryResponse(serverURL))
+	provider.EXPECT().GetCertificates().Return(idp.NewCertificatesResponse(keys.JWSKeyPair))
+	provider.EXPECT().AuthenticatePassword(username, password, scope).
+		Return(idp.NewTokenResponse(idToken, "YOUR_REFRESH_TOKEN"), nil)
+}
+
+func newBrowserMock(ctx context.Context, t *testing.T, ctrl *gomock.Controller, k keys.Keys) browser.Interface {
+	b := mock_browser.NewMockInterface(ctrl)
+	b.EXPECT().
+		Open(gomock.Any()).
+		Do(func(url string) {
+			client := http.Client{Transport: &http.Transport{TLSClientConfig: k.TLSConfig}}
+			req, err := http.NewRequest("GET", url, nil)
+			if err != nil {
+				t.Errorf("could not create a request: %s", err)
+				return
+			}
+			req = req.WithContext(ctx)
+			resp, err := client.Do(req)
+			if err != nil {
+				t.Errorf("could not send a request: %s", err)
+				return
+			}
+			defer resp.Body.Close()
+			if resp.StatusCode != 200 {
+				t.Errorf("StatusCode wants 200 but %d", resp.StatusCode)
+			}
+		})
+	return b
+}

integration_test/idp/handler.go

@@ -0,0 +1,141 @@
+package idp
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"testing"
+
+	"golang.org/x/xerrors"
+)
+
+func NewHandler(t *testing.T, provider Provider) *Handler {
+	return &Handler{t, provider}
+}
+
+// Handler provides a HTTP handler for the OpenID Connect Provider.
+// You need to implement the Provider interface.
+// Note that this skips some security checks and is only for testing.
+type Handler struct {
+	t        *testing.T
+	provider Provider
+}
+
+func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	wr := &responseWriterRecorder{w, 200}
+	err := h.serveHTTP(wr, r)
+	if err == nil {
+		h.t.Logf("%d %s %s", wr.statusCode, r.Method, r.RequestURI)
+		return
+	}
+	if errResp := new(ErrorResponse); xerrors.As(err, &errResp) {
+		h.t.Logf("400 %s %s: %s", r.Method, r.RequestURI, err)
+		w.Header().Add("Content-Type", "application/json")
+		w.WriteHeader(400)
+		e := json.NewEncoder(w)
+		if err := e.Encode(errResp); err != nil {
+			h.t.Errorf("idp/handler: could not write the response: %s", err)
+		}
+		return
+	}
+	h.t.Logf("500 %s %s: %s", r.Method, r.RequestURI, err)
+	http.Error(w, err.Error(), 500)
+}
+
+type responseWriterRecorder struct {
+	http.ResponseWriter
+	statusCode int
+}
+
+func (w *responseWriterRecorder) WriteHeader(statusCode int) {
+	w.ResponseWriter.WriteHeader(statusCode)
+	w.statusCode = statusCode
+}
+
+func (h *Handler) serveHTTP(w http.ResponseWriter, r *http.Request) error {
+	m := r.Method
+	p := r.URL.Path
+	switch {
+	case m == "GET" && p == "/.well-known/openid-configuration":
+		discoveryResponse := h.provider.Discovery()
+		w.Header().Add("Content-Type", "application/json")
+		e := json.NewEncoder(w)
+		if err := e.Encode(discoveryResponse); err != nil {
+			return xerrors.Errorf("could not render json: %w", err)
+		}
+	case m == "GET" && p == "/certs":
+		certificatesResponse := h.provider.GetCertificates()
+		w.Header().Add("Content-Type", "application/json")
+		e := json.NewEncoder(w)
+		if err := e.Encode(certificatesResponse); err != nil {
+			return xerrors.Errorf("could not render json: %w", err)
+		}
+	case m == "GET" && p == "/auth":
+		// 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)
+		if err != nil {
+			return xerrors.Errorf("authentication error: %w", err)
+		}
+		to := fmt.Sprintf("%s?state=%s&code=%s", redirectURI, state, code)
+		http.Redirect(w, r, to, 302)
+	case m == "POST" && p == "/token":
+		if err := r.ParseForm(); err != nil {
+			return xerrors.Errorf("could not parse the form: %w", err)
+		}
+		grantType := r.Form.Get("grant_type")
+		switch grantType {
+		case "authorization_code":
+			// 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)
+			if err != nil {
+				return xerrors.Errorf("token request error: %w", err)
+			}
+			w.Header().Add("Content-Type", "application/json")
+			e := json.NewEncoder(w)
+			if err := e.Encode(tokenResponse); err != nil {
+				return xerrors.Errorf("could not render json: %w", err)
+			}
+		case "password":
+			// 4.3. Resource Owner Password Credentials Grant
+			// https://tools.ietf.org/html/rfc6749#section-4.3
+			username, password, scope := r.Form.Get("username"), r.Form.Get("password"), r.Form.Get("scope")
+			tokenResponse, err := h.provider.AuthenticatePassword(username, password, scope)
+			if err != nil {
+				return xerrors.Errorf("authentication error: %w", err)
+			}
+			w.Header().Add("Content-Type", "application/json")
+			e := json.NewEncoder(w)
+			if err := e.Encode(tokenResponse); err != nil {
+				return xerrors.Errorf("could not render json: %w", err)
+			}
+		case "refresh_token":
+			// 12.1. Refresh Request
+			// https://openid.net/specs/openid-connect-core-1_0.html#RefreshingAccessToken
+			refreshToken := r.Form.Get("refresh_token")
+			tokenResponse, err := h.provider.Refresh(refreshToken)
+			if err != nil {
+				return xerrors.Errorf("token refresh error: %w", err)
+			}
+			w.Header().Add("Content-Type", "application/json")
+			e := json.NewEncoder(w)
+			if err := e.Encode(tokenResponse); err != nil {
+				return xerrors.Errorf("could not render json: %w", err)
+			}
+		default:
+			// 5.2. Error Response
+			// https://tools.ietf.org/html/rfc6749#section-5.2
+			return &ErrorResponse{
+				Code:        "invalid_grant",
+				Description: fmt.Sprintf("unknown grant_type %s", grantType),
+			}
+		}
+	default:
+		http.NotFound(w, r)
+	}
+	return nil
+}

integration_test/idp/idp.go

@@ -0,0 +1,121 @@
+// Package idp provides a test double of an OpenID Connect Provider.
+package idp
+
+//go:generate mockgen -destination mock_idp/mock_idp.go github.com/int128/kubelogin/e2e_test/idp Provider
+
+import (
+	"crypto/rsa"
+	"encoding/base64"
+	"fmt"
+	"math/big"
+)
+
+// Provider provides discovery and authentication methods.
+// If an implemented method returns an ErrorResponse,
+// the handler will respond 400 and corresponding json of the ErrorResponse.
+// Otherwise, the handler will respond 500 and fail the current test.
+type Provider interface {
+	Discovery() *DiscoveryResponse
+	GetCertificates() *CertificatesResponse
+	AuthenticateCode(scope, nonce string) (code string, err error)
+	Exchange(code string) (*TokenResponse, error)
+	AuthenticatePassword(username, password, scope string) (*TokenResponse, error)
+	Refresh(refreshToken string) (*TokenResponse, error)
+}
+
+type DiscoveryResponse struct {
+	Issuer                            string   `json:"issuer"`
+	AuthorizationEndpoint             string   `json:"authorization_endpoint"`
+	TokenEndpoint                     string   `json:"token_endpoint"`
+	UserinfoEndpoint                  string   `json:"userinfo_endpoint"`
+	RevocationEndpoint                string   `json:"revocation_endpoint"`
+	JwksURI                           string   `json:"jwks_uri"`
+	ResponseTypesSupported            []string `json:"response_types_supported"`
+	SubjectTypesSupported             []string `json:"subject_types_supported"`
+	IDTokenSigningAlgValuesSupported  []string `json:"id_token_signing_alg_values_supported"`
+	ScopesSupported                   []string `json:"scopes_supported"`
+	TokenEndpointAuthMethodsSupported []string `json:"token_endpoint_auth_methods_supported"`
+	ClaimsSupported                   []string `json:"claims_supported"`
+	CodeChallengeMethodsSupported     []string `json:"code_challenge_methods_supported"`
+}
+
+// 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"`
+}
+
+type CertificatesResponseKey struct {
+	Kty string `json:"kty"`
+	Alg string `json:"alg"`
+	Use string `json:"use"`
+	Kid string `json:"kid"`
+	N   string `json:"n"`
+	E   string `json:"e"`
+}
+
+// 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()),
+			},
+		},
+	}
+}
+
+type TokenResponse struct {
+	AccessToken  string `json:"access_token"`
+	TokenType    string `json:"token_type"`
+	RefreshToken string `json:"refresh_token"`
+	ExpiresIn    int    `json:"expires_in"`
+	IDToken      string `json:"id_token"`
+}
+
+// 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
+type ErrorResponse struct {
+	Code        string `json:"error"`
+	Description string `json:"error_description"`
+}
+
+func (err *ErrorResponse) Error() string {
+	return fmt.Sprintf("%s(%s)", err.Code, err.Description)
+}

integration_test/idp/mock_idp/mock_idp.go

@@ -0,0 +1,122 @@
+// Code generated by MockGen. DO NOT EDIT.
+// Source: github.com/int128/kubelogin/e2e_test/idp (interfaces: Provider)
+
+// Package mock_idp is a generated GoMock package.
+package mock_idp
+
+import (
+	gomock "github.com/golang/mock/gomock"
+	idp "github.com/int128/kubelogin/integration_test/idp"
+	reflect "reflect"
+)
+
+// MockProvider is a mock of Provider interface
+type MockProvider struct {
+	ctrl     *gomock.Controller
+	recorder *MockProviderMockRecorder
+}
+
+// MockProviderMockRecorder is the mock recorder for MockProvider
+type MockProviderMockRecorder struct {
+	mock *MockProvider
+}
+
+// NewMockProvider creates a new mock instance
+func NewMockProvider(ctrl *gomock.Controller) *MockProvider {
+	mock := &MockProvider{ctrl: ctrl}
+	mock.recorder = &MockProviderMockRecorder{mock}
+	return mock
+}
+
+// EXPECT returns an object that allows the caller to indicate expected use
+func (m *MockProvider) EXPECT() *MockProviderMockRecorder {
+	return m.recorder
+}
+
+// AuthenticateCode mocks base method
+func (m *MockProvider) AuthenticateCode(arg0, arg1 string) (string, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "AuthenticateCode", arg0, arg1)
+	ret0, _ := ret[0].(string)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// AuthenticateCode indicates an expected call of AuthenticateCode
+func (mr *MockProviderMockRecorder) AuthenticateCode(arg0, arg1 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "AuthenticateCode", reflect.TypeOf((*MockProvider)(nil).AuthenticateCode), arg0, arg1)
+}
+
+// AuthenticatePassword mocks base method
+func (m *MockProvider) AuthenticatePassword(arg0, arg1, arg2 string) (*idp.TokenResponse, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "AuthenticatePassword", arg0, arg1, arg2)
+	ret0, _ := ret[0].(*idp.TokenResponse)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// AuthenticatePassword indicates an expected call of AuthenticatePassword
+func (mr *MockProviderMockRecorder) AuthenticatePassword(arg0, arg1, arg2 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "AuthenticatePassword", reflect.TypeOf((*MockProvider)(nil).AuthenticatePassword), arg0, arg1, arg2)
+}
+
+// Discovery mocks base method
+func (m *MockProvider) Discovery() *idp.DiscoveryResponse {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Discovery")
+	ret0, _ := ret[0].(*idp.DiscoveryResponse)
+	return ret0
+}
+
+// Discovery indicates an expected call of Discovery
+func (mr *MockProviderMockRecorder) Discovery() *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Discovery", reflect.TypeOf((*MockProvider)(nil).Discovery))
+}
+
+// Exchange mocks base method
+func (m *MockProvider) Exchange(arg0 string) (*idp.TokenResponse, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Exchange", arg0)
+	ret0, _ := ret[0].(*idp.TokenResponse)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// Exchange indicates an expected call of Exchange
+func (mr *MockProviderMockRecorder) Exchange(arg0 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Exchange", reflect.TypeOf((*MockProvider)(nil).Exchange), arg0)
+}
+
+// GetCertificates mocks base method
+func (m *MockProvider) GetCertificates() *idp.CertificatesResponse {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "GetCertificates")
+	ret0, _ := ret[0].(*idp.CertificatesResponse)
+	return ret0
+}
+
+// GetCertificates indicates an expected call of GetCertificates
+func (mr *MockProviderMockRecorder) GetCertificates() *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "GetCertificates", reflect.TypeOf((*MockProvider)(nil).GetCertificates))
+}
+
+// Refresh mocks base method
+func (m *MockProvider) Refresh(arg0 string) (*idp.TokenResponse, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Refresh", arg0)
+	ret0, _ := ret[0].(*idp.TokenResponse)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// Refresh indicates an expected call of Refresh
+func (mr *MockProviderMockRecorder) Refresh(arg0 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Refresh", reflect.TypeOf((*MockProvider)(nil).Refresh), arg0)
+}

integration_test/keys/keys.go

@@ -0,0 +1,90 @@
+package keys
+
+import (
+	"crypto/rsa"
+	"crypto/tls"
+	"crypto/x509"
+	"encoding/base64"
+	"encoding/pem"
+	"io"
+	"io/ioutil"
+	"os"
+	"strings"
+)
+
+// Keys represents a pair of certificate and key.
+type Keys struct {
+	CertPath     string
+	KeyPath      string
+	CACertPath   string
+	CACertBase64 string
+	TLSConfig    *tls.Config
+}
+
+// None represents non-TLS.
+var None Keys
+
+// Server is a Keys for TLS server.
+// These files should be generated by Makefile before test.
+var Server = Keys{
+	CertPath:     "keys/testdata/server.crt",
+	KeyPath:      "keys/testdata/server.key",
+	CACertPath:   "keys/testdata/ca.crt",
+	CACertBase64: readAsBase64("keys/testdata/ca.crt"),
+	TLSConfig:    newTLSConfig("keys/testdata/ca.crt"),
+}
+
+// JWSKey is path to the key for signing ID tokens.
+// This file should be generated by Makefile before test.
+const JWSKey = "keys/testdata/jws.key"
+
+// JWSKeyPair is the key pair loaded from JWSKey.
+var JWSKeyPair = readPrivateKey(JWSKey)
+
+func readAsBase64(name string) string {
+	f, err := os.Open(name)
+	if err != nil {
+		panic(err)
+	}
+	defer f.Close()
+	var s strings.Builder
+	e := base64.NewEncoder(base64.StdEncoding, &s)
+	if _, err := io.Copy(e, f); err != nil {
+		panic(err)
+	}
+	if err := e.Close(); err != nil {
+		panic(err)
+	}
+	return s.String()
+}
+
+func newTLSConfig(name string) *tls.Config {
+	b, err := ioutil.ReadFile(name)
+	if err != nil {
+		panic(err)
+	}
+	p := x509.NewCertPool()
+	if !p.AppendCertsFromPEM(b) {
+		panic("could not append the CA cert")
+	}
+	return &tls.Config{RootCAs: p}
+}
+
+func readPrivateKey(name string) *rsa.PrivateKey {
+	b, err := ioutil.ReadFile(name)
+	if err != nil {
+		panic(err)
+	}
+	block, rest := pem.Decode(b)
+	if block == nil {
+		panic("could not decode PEM")
+	}
+	if len(rest) > 0 {
+		panic("PEM should contain single key but multiple keys")
+	}
+	k, err := x509.ParsePKCS1PrivateKey(block.Bytes)
+	if err != nil {
+		panic(err)
+	}
+	return k
+}

integration_test/keys/testdata/Makefile

@@ -0,0 +1,30 @@
+EXPIRY := 3650
+OUTPUT_DIR := testdata
+TARGETS := ca.key
+TARGETS += ca.crt
+TARGETS += server.key
+TARGETS += server.crt
+TARGETS += jws.key
+
+.PHONY: all
+all: $(TARGETS)
+
+ca.key:
+	openssl genrsa -out $@ 2048
+ca.csr: ca.key
+	openssl req -new -key ca.key -out $@ -subj "/CN=hello-ca" -config openssl.cnf
+ca.crt: ca.key ca.csr
+	openssl x509 -req -in ca.csr -signkey ca.key -out $@ -days $(EXPIRY)
+server.key:
+	openssl genrsa -out $@ 2048
+server.csr: openssl.cnf server.key
+	openssl req -new -key server.key -out $@ -subj "/CN=localhost" -config openssl.cnf
+server.crt: openssl.cnf server.csr ca.crt ca.key
+	openssl x509 -req -in server.csr -CA ca.crt -CAkey ca.key -CAcreateserial -out $@ -sha256 -days $(EXPIRY) -extensions v3_req -extfile openssl.cnf
+
+jws.key:
+	openssl genrsa -out $@ 2048
+
+.PHONY: clean
+clean:
+	-rm -v $(TARGETS)

integration_test/keys/testdata/ca.crt

@@ -0,0 +1,17 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----

integration_test/keys/testdata/ca.csr

@@ -0,0 +1,17 @@
+-----BEGIN CERTIFICATE REQUEST-----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+-----END CERTIFICATE REQUEST-----

integration_test/keys/testdata/ca.key

@@ -0,0 +1,27 @@
+-----BEGIN RSA PRIVATE KEY-----
+MIIEowIBAAKCAQEAxcPNdS88B6ewqVn/m9yO74OLIwNrqMci8l7olP9XlcJhxUZs
++3WZQpsSj5nC4yEx8uPQbTtBKnXXVDe+8k7OsLTruu9+isTaYk4o/TZbuw/N31ZA
+iT0pJw8hdypTQyMLbeDrVl4bbrfbYywx30DyrHxUkgzOWs459Uwc1wWu0W7M21GY
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+vFE6zSyAxU55RElph7mEru9cNWAYhCRZvlZQ2VlH7C6JQ3SHyA9RZmBbPpXhtl9z
+avFkGx2MEwDp/3FmUukRyJnS2KnAo0QdBeS1LQIDAQABAoIBAHSoWtMsaMnPNlu/
+thM32K0auIGP6/rkdQ3pxGLX+M9jmY7oSzNOHHj4xssklZyroS45CmLU2Ez2tG1+
+cMm4iR4dqwxbaBbtpjDlEDLF1PiUiwmadHlANb1PpJsJwZHR41UOn2QUITR/ig+H
+K2gZhM0QjkaU/Uj9a5zyJ/UC6iupmgCtj8ij65B49qKMODxV4gqZstRSZiJ3gb6R
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++rkyaKUjEwJJQcgpCfUI4t9HAwICqYtw0fQdDDaMak2XTDFnGHn1/VfSi818U5Sa
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+PlgR3uwpH9TNWHITZEEb/I93r2E3f24v2018g0uJuwiRDusxHs7yuxw/93Y5rwtG
+3twL1k0GyeLCxfM2y2QQU/awXISx7nNk2f0umvTWmjrEw632oQSWCSECgYEA3yaF
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+UL9dCb4Z8HUclj55kBSx8anvVtf3XAT3hZ3sm8LV3JLGDeURGS8rGdV+tyFk7zw9
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+rNG2cFT9+bW1ly7WxAKsQgSIuaBZ2CtP6Nz0l0nPr5oEThsJDcYJB9faqFKoa3Ua
+/4PxX9E6Xh/6WfxogFno+HMnF4PCUTXtkjNZQkc+moOMJJ0D4DfsfB3BXDZtWiIC
+wDuNAoGBAN5ZFTXwE1VpWxIWq5dV9+0aVOP/eB+h7Pt+u2xyRip31FGcpGEzGniu
+VmOzWApW7NmvD0QWtstJWlCpsw+rOptAL0oVunlB70KuYuA+2Q5g/Cw3kUrvXqbe
+mkCoV21eFAmpU+I6z/n7pUDXPuUsmTkzmwedv0HUuNSQJmHZOMPD
+-----END RSA PRIVATE KEY-----

integration_test/keys/testdata/ca.srl

@@ -0,0 +1 @@
+9E12C7A1AF348811

integration_test/keys/testdata/jws.key

@@ -0,0 +1,27 @@
+-----BEGIN RSA PRIVATE KEY-----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+-----END RSA PRIVATE KEY-----

integration_test/keys/testdata/openssl.cnf

@@ -0,0 +1,14 @@
+[ req ]
+distinguished_name = req_distinguished_name
+req_extensions = v3_req
+
+[ req_distinguished_name ]
+
+[ v3_req ]
+basicConstraints = CA:FALSE
+keyUsage = nonRepudiation, digitalSignature, keyEncipherment
+subjectAltName = @alt_names
+extendedKeyUsage = serverAuth
+
+[alt_names]
+DNS.1 = localhost

integration_test/keys/testdata/server.crt

@@ -0,0 +1,18 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----

integration_test/keys/testdata/server.csr

@@ -0,0 +1,17 @@
+-----BEGIN CERTIFICATE REQUEST-----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+-----END CERTIFICATE REQUEST-----

integration_test/keys/testdata/server.key

@@ -0,0 +1,27 @@
+-----BEGIN RSA PRIVATE KEY-----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+-----END RSA PRIVATE KEY-----

integration_test/kubeconfig/kubeconfig.go

@@ -16,6 +16,7 @@ type Values struct {
 	IDPCertificateAuthority     string
 	IDPCertificateAuthorityData string
 	IDToken                     string
+	RefreshToken                string
 }
 
 // Create creates a kubeconfig file and returns path to it.

integration_test/kubeconfig/testdata/kubeconfig.yaml

@@ -30,5 +30,8 @@ users:
 #{{ end }}
 #{{ if .IDToken }}
         id-token: {{ .IDToken }}
+#{{ end }}
+#{{ if .RefreshToken }}
+        refresh-token: {{ .RefreshToken }}
 #{{ end }}
       name: oidc

integration_test/localserver/authserver.go

@@ -0,0 +1,85 @@
+// Package localserver provides a http server running on localhost.
+// This is only for testing.
+//
+package localserver
+
+import (
+	"context"
+	"net"
+	"net/http"
+	"testing"
+
+	"github.com/int128/kubelogin/integration_test/keys"
+)
+
+type Shutdowner interface {
+	Shutdown(t *testing.T, ctx context.Context)
+}
+
+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)
+	}
+}
+
+// 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 {
+		return startNoTLS(t, h)
+	}
+	return startTLS(t, h, k)
+}
+
+func startNoTLS(t *testing.T, h http.Handler) (string, Shutdowner) {
+	t.Helper()
+	l, port := newLocalhostListener(t)
+	url := "http://localhost:" + port
+	s := &http.Server{
+		Handler: h,
+	}
+	go func() {
+		err := s.Serve(l)
+		if err != nil && err != http.ErrServerClosed {
+			t.Error(err)
+		}
+	}()
+	return url, &shutdowner{l, s}
+}
+
+func startTLS(t *testing.T, h http.Handler, k keys.Keys) (string, Shutdowner) {
+	t.Helper()
+	l, port := newLocalhostListener(t)
+	url := "https://localhost:" + port
+	s := &http.Server{
+		Handler: h,
+	}
+	go func() {
+		err := s.ServeTLS(l, k.CertPath, k.KeyPath)
+		if err != nil && err != http.ErrServerClosed {
+			t.Error(err)
+		}
+	}()
+	return url, &shutdowner{l, s}
+}
+
+func newLocalhostListener(t *testing.T) (net.Listener, string) {
+	t.Helper()
+	l, err := net.Listen("tcp", "localhost:0")
+	if err != nil {
+		t.Fatalf("Could not create a listener: %s", err)
+	}
+	addr := l.Addr().String()
+	_, port, err := net.SplitHostPort(addr)
+	if err != nil {
+		t.Fatalf("Could not parse the address %s: %s", addr, err)
+	}
+	return l, port
+}

integration_test/standalone_test.go

@@ -0,0 +1,290 @@
+package integration_test
+
+import (
+	"context"
+	"os"
+	"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/kubeconfig"
+	"github.com/int128/kubelogin/integration_test/localserver"
+	"github.com/int128/kubelogin/pkg/adaptors/browser"
+	"github.com/int128/kubelogin/pkg/adaptors/browser/mock_browser"
+	"github.com/int128/kubelogin/pkg/adaptors/logger/mock_logger"
+	"github.com/int128/kubelogin/pkg/di"
+)
+
+// Run the integration tests of the Login use-case.
+//
+// 1. Start the auth server.
+// 2. Run the Cmd.
+// 3. Open a request for the local server.
+// 4. Verify the kubeconfig.
+//
+func TestStandalone(t *testing.T) {
+	t.Run("NoTLS", func(t *testing.T) {
+		testStandalone(t, keys.None)
+	})
+	t.Run("TLS", func(t *testing.T) {
+		testStandalone(t, keys.Server)
+	})
+}
+
+func testStandalone(t *testing.T, idpTLS keys.Keys) {
+	timeout := 5 * time.Second
+
+	t.Run("Defaults", 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)
+		kubeConfigFilename := kubeconfig.Create(t, &kubeconfig.Values{
+			Issuer:                  serverURL,
+			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("ResourceOwnerPasswordCredentials", func(t *testing.T) {
+		t.Parallel()
+		ctx, cancel := context.WithTimeout(context.TODO(), timeout)
+		defer cancel()
+		ctrl := gomock.NewController(t)
+		defer ctrl.Finish()
+
+		provider := mock_idp.NewMockProvider(ctrl)
+		serverURL, server := localserver.Start(t, idp.NewHandler(t, provider), idpTLS)
+		defer server.Shutdown(t, ctx)
+		browserMock := mock_browser.NewMockInterface(ctrl)
+		idToken := newIDToken(t, serverURL, "", tokenExpiryFuture)
+		setupROPCFlow(provider, serverURL, "openid", "USER", "PASS", idToken)
+		kubeConfigFilename := kubeconfig.Create(t, &kubeconfig.Values{
+			Issuer:                  serverURL,
+			IDPCertificateAuthority: idpTLS.CACertPath,
+		})
+		defer os.Remove(kubeConfigFilename)
+
+		args := []string{
+			"--kubeconfig", kubeConfigFilename,
+			"--username", "USER",
+			"--password", "PASS",
+		}
+		runRootCmd(t, ctx, browserMock, args)
+		kubeconfig.Verify(t, kubeConfigFilename, kubeconfig.AuthProviderConfig{
+			IDToken:      idToken,
+			RefreshToken: "YOUR_REFRESH_TOKEN",
+		})
+	})
+
+	t.Run("HasValidToken", func(t *testing.T) {
+		t.Parallel()
+		ctx, cancel := context.WithTimeout(context.TODO(), timeout)
+		defer cancel()
+		ctrl := gomock.NewController(t)
+		defer ctrl.Finish()
+
+		provider := mock_idp.NewMockProvider(ctrl)
+		serverURL, server := localserver.Start(t, idp.NewHandler(t, provider), idpTLS)
+		defer server.Shutdown(t, ctx)
+		idToken := newIDToken(t, serverURL, "YOUR_NONCE", tokenExpiryFuture)
+		browserMock := mock_browser.NewMockInterface(ctrl)
+
+		kubeConfigFilename := kubeconfig.Create(t, &kubeconfig.Values{
+			Issuer:                  serverURL,
+			IDToken:                 idToken,
+			RefreshToken:            "YOUR_REFRESH_TOKEN",
+			IDPCertificateAuthority: idpTLS.CACertPath,
+		})
+		defer os.Remove(kubeConfigFilename)
+
+		args := []string{
+			"--kubeconfig", kubeConfigFilename,
+		}
+		runRootCmd(t, ctx, browserMock, args)
+		kubeconfig.Verify(t, kubeConfigFilename, kubeconfig.AuthProviderConfig{
+			IDToken:      idToken,
+			RefreshToken: "YOUR_REFRESH_TOKEN",
+		})
+	})
+
+	t.Run("HasValidRefreshToken", func(t *testing.T) {
+		t.Parallel()
+		ctx, cancel := context.WithTimeout(context.TODO(), timeout)
+		defer cancel()
+		ctrl := gomock.NewController(t)
+		defer ctrl.Finish()
+
+		provider := mock_idp.NewMockProvider(ctrl)
+		serverURL, server := localserver.Start(t, idp.NewHandler(t, provider), idpTLS)
+		defer server.Shutdown(t, ctx)
+		idToken := newIDToken(t, serverURL, "YOUR_NONCE", tokenExpiryFuture)
+		provider.EXPECT().Discovery().Return(idp.NewDiscoveryResponse(serverURL))
+		provider.EXPECT().GetCertificates().Return(idp.NewCertificatesResponse(keys.JWSKeyPair))
+		provider.EXPECT().Refresh("VALID_REFRESH_TOKEN").
+			Return(idp.NewTokenResponse(idToken, "NEW_REFRESH_TOKEN"), nil)
+		browserMock := mock_browser.NewMockInterface(ctrl)
+
+		kubeConfigFilename := kubeconfig.Create(t, &kubeconfig.Values{
+			Issuer:                  serverURL,
+			IDToken:                 newIDToken(t, serverURL, "YOUR_NONCE", tokenExpiryPast), // expired
+			RefreshToken:            "VALID_REFRESH_TOKEN",
+			IDPCertificateAuthority: idpTLS.CACertPath,
+		})
+		defer os.Remove(kubeConfigFilename)
+
+		args := []string{
+			"--kubeconfig", kubeConfigFilename,
+		}
+		runRootCmd(t, ctx, browserMock, args)
+		kubeconfig.Verify(t, kubeConfigFilename, kubeconfig.AuthProviderConfig{
+			IDToken:      idToken,
+			RefreshToken: "NEW_REFRESH_TOKEN",
+		})
+	})
+
+	t.Run("HasExpiredRefreshToken", func(t *testing.T) {
+		t.Parallel()
+		ctx, cancel := context.WithTimeout(context.TODO(), timeout)
+		defer cancel()
+		ctrl := gomock.NewController(t)
+		defer ctrl.Finish()
+
+		provider := mock_idp.NewMockProvider(ctrl)
+		serverURL, server := localserver.Start(t, idp.NewHandler(t, provider), idpTLS)
+		defer server.Shutdown(t, ctx)
+		var idToken string
+		setupAuthCodeFlow(t, provider, serverURL, "openid", &idToken)
+		provider.EXPECT().Refresh("EXPIRED_REFRESH_TOKEN").
+			Return(nil, &idp.ErrorResponse{Code: "invalid_request", Description: "token has expired"}).
+			MaxTimes(2) // package oauth2 will retry refreshing the token
+		browserMock := newBrowserMock(ctx, t, ctrl, idpTLS)
+
+		kubeConfigFilename := kubeconfig.Create(t, &kubeconfig.Values{
+			Issuer:                  serverURL,
+			IDToken:                 newIDToken(t, serverURL, "YOUR_NONCE", tokenExpiryPast), // expired
+			RefreshToken:            "EXPIRED_REFRESH_TOKEN",
+			IDPCertificateAuthority: idpTLS.CACertPath,
+		})
+		defer os.Remove(kubeConfigFilename)
+
+		args := []string{
+			"--kubeconfig", kubeConfigFilename,
+		}
+		runRootCmd(t, ctx, browserMock, args)
+		kubeconfig.Verify(t, kubeConfigFilename, kubeconfig.AuthProviderConfig{
+			IDToken:      idToken,
+			RefreshToken: "YOUR_REFRESH_TOKEN",
+		})
+	})
+
+	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)
+
+		kubeConfigFilename := kubeconfig.Create(t, &kubeconfig.Values{
+			Issuer:                  serverURL,
+			IDPCertificateAuthority: idpTLS.CACertPath,
+		})
+		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)
+		kubeconfig.Verify(t, kubeConfigFilename, kubeconfig.AuthProviderConfig{
+			IDToken:      idToken,
+			RefreshToken: "YOUR_REFRESH_TOKEN",
+		})
+	})
+
+	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()
+
+		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)
+
+		kubeConfigFilename := kubeconfig.Create(t, &kubeconfig.Values{
+			Issuer:                  serverURL,
+			ExtraScopes:             "profile,groups",
+			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",
+		})
+	})
+}
+
+func runRootCmd(t *testing.T, ctx context.Context, b browser.Interface, args []string) {
+	t.Helper()
+	cmd := di.NewCmdForHeadless(mock_logger.New(t), b, nil)
+	exitCode := cmd.Run(ctx, append([]string{
+		"kubelogin",
+		"--v=1",
+		"--listen-address", "127.0.0.1:0",
+	}, args...), "HEAD")
+	if exitCode != 0 {
+		t.Errorf("exit status wants 0 but %d", exitCode)
+	}
+}
+
+func setenv(t *testing.T, key, value string) {
+	t.Helper()
+	if err := os.Setenv(key, value); err != nil {
+		t.Fatalf("Could not set the env var %s=%s: %s", key, value, err)
+	}
+}
+
+func unsetenv(t *testing.T, key string) {
+	t.Helper()
+	if err := os.Unsetenv(key); err != nil {
+		t.Fatalf("Could not unset the env var %s: %s", key, err)
+	}
+}

kubeconfig/auth.go

@@ -1,56 +0,0 @@
-package kubeconfig
-
-import (
-	"strings"
-)
-
-// OIDCConfig represents config of an oidc auth-provider.
-type OIDCConfig map[string]string
-
-// IDPIssuerURL returns the idp-issuer-url.
-func (c OIDCConfig) IDPIssuerURL() string {
-	return c["idp-issuer-url"]
-}
-
-// ClientID returns the client-id.
-func (c OIDCConfig) ClientID() string {
-	return c["client-id"]
-}
-
-// ClientSecret returns the client-secret.
-func (c OIDCConfig) ClientSecret() string {
-	return c["client-secret"]
-}
-
-// IDPCertificateAuthority returns the idp-certificate-authority.
-func (c OIDCConfig) IDPCertificateAuthority() string {
-	return c["idp-certificate-authority"]
-}
-
-// IDPCertificateAuthorityData returns the idp-certificate-authority-data.
-func (c OIDCConfig) IDPCertificateAuthorityData() string {
-	return c["idp-certificate-authority-data"]
-}
-
-// ExtraScopes returns the extra-scopes.
-func (c OIDCConfig) ExtraScopes() []string {
-	if c["extra-scopes"] == "" {
-		return []string{}
-	}
-	return strings.Split(c["extra-scopes"], ",")
-}
-
-// IDToken returns the id-token.
-func (c OIDCConfig) IDToken() string {
-	return c["id-token"]
-}
-
-// SetIDToken replaces the id-token.
-func (c OIDCConfig) SetIDToken(idToken string) {
-	c["id-token"] = idToken
-}
-
-// SetRefreshToken replaces the refresh-token.
-func (c OIDCConfig) SetRefreshToken(refreshToken string) {
-	c["refresh-token"] = refreshToken
-}

kubeconfig/kubeconfig.go

@@ -1,66 +0,0 @@
-// Package kubeconfig provides the models of kubeconfig file.
-package kubeconfig
-
-import (
-	"github.com/pkg/errors"
-	"k8s.io/client-go/tools/clientcmd/api"
-)
-
-type ContextName string
-type UserName string
-
-// Config represents a config.
-type Config api.Config
-
-// Context represents a context.
-type Context api.Context
-
-// User represents a user.
-type User api.AuthInfo
-
-// CurrentAuth represents the current authentication, that is,
-// context, user and auth-provider.
-type CurrentAuth struct {
-	ContextName ContextName // empty if UserName is given
-	Context     *Context    // nil if UserName is given
-	UserName    UserName
-	User        *User
-	OIDCConfig  OIDCConfig
-}
-
-// FindCurrentAuth resolves the current context and user.
-// If contextName is given, this returns the user of the context.
-// If userName is given, this ignores the context and returns the user.
-// If any context or user is not found, this returns an error.
-func FindCurrentAuth(config *Config, contextName ContextName, userName UserName) (*CurrentAuth, error) {
-	var kubeContext *Context
-	if userName == "" {
-		if contextName == "" {
-			contextName = ContextName(config.CurrentContext)
-		}
-		contextNode := config.Contexts[string(contextName)]
-		if contextNode == nil {
-			return nil, errors.Errorf("context %s does not exist", contextName)
-		}
-		kubeContext = (*Context)(contextNode)
-		userName = UserName(kubeContext.AuthInfo)
-	}
-	userNode := config.AuthInfos[string(userName)]
-	if userNode == nil {
-		return nil, errors.Errorf("user %s does not exist", userName)
-	}
-	user := (*User)(userNode)
-	if user.AuthProvider == nil {
-		return nil, errors.Errorf("auth-provider is missing")
-	}
-	if user.AuthProvider.Name != "oidc" {
-		return nil, errors.Errorf("auth-provider must be oidc but is %s", user.AuthProvider.Name)
-	}
-	return &CurrentAuth{
-		ContextName: contextName,
-		Context:     kubeContext,
-		UserName:    userName,
-		User:        user,
-		OIDCConfig:  user.AuthProvider.Config,
-	}, nil
-}

main.go

@@ -2,19 +2,13 @@ package main
 
 import (
 	"context"
-	"log"
 	"os"
 
-	"github.com/int128/kubelogin/adaptors/interfaces"
-	"github.com/int128/kubelogin/di"
+	"github.com/int128/kubelogin/pkg/di"
 )
 
 var version = "HEAD"
 
 func main() {
-	if err := di.Invoke(func(cmd adaptors.Cmd) {
-		os.Exit(cmd.Run(context.Background(), os.Args, version))
-	}); err != nil {
-		log.Fatalf("Error: %s", err)
-	}
+	os.Exit(di.NewCmd().Run(context.Background(), os.Args, version))
 }

oidc-login.yaml

@@ -1,57 +0,0 @@
-apiVersion: krew.googlecontainertools.github.com/v1alpha2
-kind: Plugin
-metadata:
-  name: oidc-login
-spec:
-  shortDescription: Login for OpenID Connect authentication
-  description: |
-    This plugin gets a token from the OIDC provider and writes it to the kubeconfig.
-
-    Just run:
-      % kubectl oidc-login
-
-    It opens the browser and you can log in to the provider.
-    After authentication, it gets an ID token and refresh token and writes them to the kubeconfig.
-
-  caveats: |
-    You need to setup the following components:
-      * OIDC provider
-      * Kubernetes API server
-      * Role for your group or user
-      * kubectl authentication
-
-    See https://github.com/int128/kubelogin for more.
-
-  homepage: https://github.com/int128/kubelogin
-  version: {{ env "VERSION" }}
-  platforms:
-    - uri: https://github.com/int128/kubelogin/releases/download/{{ env "VERSION" }}/kubelogin_linux_amd64.zip
-      sha256: "{{ sha256 .linux_amd64_archive }}"
-      bin: kubelogin
-      files:
-        - from: "kubelogin"
-          to: "."
-      selector:
-        matchLabels:
-          os: linux
-          arch: amd64
-    - uri: https://github.com/int128/kubelogin/releases/download/{{ env "VERSION" }}/kubelogin_darwin_amd64.zip
-      sha256: "{{ sha256 .darwin_amd64_archive }}"
-      bin: kubelogin
-      files:
-        - from: "kubelogin"
-          to: "."
-      selector:
-        matchLabels:
-          os: darwin
-          arch: amd64
-    - uri: https://github.com/int128/kubelogin/releases/download/{{ env "VERSION" }}/kubelogin_windows_amd64.zip
-      sha256: "{{ sha256 .windows_amd64_archive }}"
-      bin: kubelogin.exe
-      files:
-        - from: "kubelogin.exe"
-          to: "."
-      selector:
-        matchLabels:
-          os: windows
-          arch: amd64

pkg/adaptors/browser/browser.go

@@ -0,0 +1,34 @@
+package browser
+
+import (
+	"os"
+
+	"github.com/google/wire"
+	"github.com/pkg/browser"
+)
+
+//go:generate mockgen -destination mock_browser/mock_browser.go github.com/int128/kubelogin/pkg/adaptors/browser Interface
+
+func init() {
+	// In credential plugin mode, some browser launcher writes a message to stdout
+	// and it may break the credential json for client-go.
+	// This prevents the browser launcher from breaking the credential json.
+	browser.Stdout = os.Stderr
+}
+
+// Set provides an implementation and interface for Env.
+var Set = wire.NewSet(
+	wire.Struct(new(Browser)),
+	wire.Bind(new(Interface), new(*Browser)),
+)
+
+type Interface interface {
+	Open(url string) error
+}
+
+type Browser struct{}
+
+// Open opens the default browser.
+func (*Browser) Open(url string) error {
+	return browser.OpenURL(url)
+}

pkg/adaptors/browser/mock_browser/mock_browser.go

@@ -0,0 +1,47 @@
+// Code generated by MockGen. DO NOT EDIT.
+// Source: github.com/int128/kubelogin/pkg/adaptors/browser (interfaces: Interface)
+
+// Package mock_browser is a generated GoMock package.
+package mock_browser
+
+import (
+	gomock "github.com/golang/mock/gomock"
+	reflect "reflect"
+)
+
+// MockInterface is a mock of Interface interface
+type MockInterface struct {
+	ctrl     *gomock.Controller
+	recorder *MockInterfaceMockRecorder
+}
+
+// MockInterfaceMockRecorder is the mock recorder for MockInterface
+type MockInterfaceMockRecorder struct {
+	mock *MockInterface
+}
+
+// NewMockInterface creates a new mock instance
+func NewMockInterface(ctrl *gomock.Controller) *MockInterface {
+	mock := &MockInterface{ctrl: ctrl}
+	mock.recorder = &MockInterfaceMockRecorder{mock}
+	return mock
+}
+
+// EXPECT returns an object that allows the caller to indicate expected use
+func (m *MockInterface) EXPECT() *MockInterfaceMockRecorder {
+	return m.recorder
+}
+
+// Open mocks base method
+func (m *MockInterface) Open(arg0 string) error {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Open", arg0)
+	ret0, _ := ret[0].(error)
+	return ret0
+}
+
+// Open indicates an expected call of Open
+func (mr *MockInterfaceMockRecorder) Open(arg0 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Open", reflect.TypeOf((*MockInterface)(nil).Open), arg0)
+}

pkg/adaptors/certpool/cert.go

@@ -0,0 +1,71 @@
+// Package certpool provides loading certificates from files or base64 encoded string.
+package certpool
+
+import (
+	"crypto/tls"
+	"crypto/x509"
+	"encoding/base64"
+	"io/ioutil"
+
+	"github.com/google/wire"
+	"golang.org/x/xerrors"
+)
+
+//go:generate mockgen -destination mock_certpool/mock_certpool.go github.com/int128/kubelogin/pkg/adaptors/certpool Interface
+
+// Set provides an implementation and interface.
+var Set = wire.NewSet(
+	wire.Value(NewFunc(New)),
+	wire.Struct(new(CertPool), "*"),
+	wire.Bind(new(Interface), new(*CertPool)),
+)
+
+type NewFunc func() Interface
+
+// New returns an instance which implements the Interface.
+func New() Interface {
+	return &CertPool{pool: x509.NewCertPool()}
+}
+
+type Interface interface {
+	AddFile(filename string) error
+	AddBase64Encoded(s string) error
+	SetRootCAs(cfg *tls.Config)
+}
+
+// CertPool represents a pool of certificates.
+type CertPool struct {
+	pool *x509.CertPool
+}
+
+// SetRootCAs sets cfg.RootCAs if it has any certificate.
+// Otherwise do nothing.
+func (p *CertPool) SetRootCAs(cfg *tls.Config) {
+	if len(p.pool.Subjects()) > 0 {
+		cfg.RootCAs = p.pool
+	}
+}
+
+// AddFile loads the certificate from the file.
+func (p *CertPool) AddFile(filename string) error {
+	b, err := ioutil.ReadFile(filename)
+	if err != nil {
+		return xerrors.Errorf("could not read %s: %w", filename, err)
+	}
+	if !p.pool.AppendCertsFromPEM(b) {
+		return xerrors.Errorf("could not append certificate from %s", filename)
+	}
+	return nil
+}
+
+// AddBase64Encoded loads the certificate from the base64 encoded string.
+func (p *CertPool) AddBase64Encoded(s string) error {
+	b, err := base64.StdEncoding.DecodeString(s)
+	if err != nil {
+		return xerrors.Errorf("could not decode base64: %w", err)
+	}
+	if !p.pool.AppendCertsFromPEM(b) {
+		return xerrors.Errorf("could not append certificate")
+	}
+	return nil
+}

pkg/adaptors/certpool/cert_test.go

@@ -0,0 +1,58 @@
+package certpool
+
+import (
+	"crypto/tls"
+	"io/ioutil"
+	"testing"
+)
+
+func TestCertPool_AddFile(t *testing.T) {
+	t.Run("Valid", func(t *testing.T) {
+		p := New()
+		if err := p.AddFile("testdata/ca1.crt"); err != nil {
+			t.Errorf("AddFile error: %s", err)
+		}
+		var cfg tls.Config
+		p.SetRootCAs(&cfg)
+		if n := len(cfg.RootCAs.Subjects()); n != 1 {
+			t.Errorf("n wants 1 but was %d", n)
+		}
+	})
+	t.Run("Invalid", func(t *testing.T) {
+		p := New()
+		err := p.AddFile("testdata/Makefile")
+		if err == nil {
+			t.Errorf("AddFile wants an error but was nil")
+		}
+	})
+}
+
+func TestCertPool_AddBase64Encoded(t *testing.T) {
+	p := New()
+	if err := p.AddBase64Encoded(readFile(t, "testdata/ca2.crt.base64")); err != nil {
+		t.Errorf("AddBase64Encoded error: %s", err)
+	}
+	var cfg tls.Config
+	p.SetRootCAs(&cfg)
+	if n := len(cfg.RootCAs.Subjects()); n != 1 {
+		t.Errorf("n wants 1 but was %d", n)
+	}
+}
+
+func TestCertPool_SetRootCAs(t *testing.T) {
+	p := New()
+	var cfg tls.Config
+	p.SetRootCAs(&cfg)
+	if cfg.RootCAs != nil {
+		t.Errorf("cfg.RootCAs wants nil but was %+v", cfg.RootCAs)
+	}
+}
+
+func readFile(t *testing.T, filename string) string {
+	t.Helper()
+	b, err := ioutil.ReadFile(filename)
+	if err != nil {
+		t.Fatalf("ReadFile error: %s", err)
+	}
+	return string(b)
+}

pkg/adaptors/certpool/mock_certpool/mock_certpool.go

@@ -0,0 +1,74 @@
+// Code generated by MockGen. DO NOT EDIT.
+// Source: github.com/int128/kubelogin/pkg/adaptors/certpool (interfaces: Interface)
+
+// Package mock_certpool is a generated GoMock package.
+package mock_certpool
+
+import (
+	tls "crypto/tls"
+	gomock "github.com/golang/mock/gomock"
+	reflect "reflect"
+)
+
+// MockInterface is a mock of Interface interface
+type MockInterface struct {
+	ctrl     *gomock.Controller
+	recorder *MockInterfaceMockRecorder
+}
+
+// MockInterfaceMockRecorder is the mock recorder for MockInterface
+type MockInterfaceMockRecorder struct {
+	mock *MockInterface
+}
+
+// NewMockInterface creates a new mock instance
+func NewMockInterface(ctrl *gomock.Controller) *MockInterface {
+	mock := &MockInterface{ctrl: ctrl}
+	mock.recorder = &MockInterfaceMockRecorder{mock}
+	return mock
+}
+
+// EXPECT returns an object that allows the caller to indicate expected use
+func (m *MockInterface) EXPECT() *MockInterfaceMockRecorder {
+	return m.recorder
+}
+
+// AddBase64Encoded mocks base method
+func (m *MockInterface) AddBase64Encoded(arg0 string) error {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "AddBase64Encoded", arg0)
+	ret0, _ := ret[0].(error)
+	return ret0
+}
+
+// AddBase64Encoded indicates an expected call of AddBase64Encoded
+func (mr *MockInterfaceMockRecorder) AddBase64Encoded(arg0 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "AddBase64Encoded", reflect.TypeOf((*MockInterface)(nil).AddBase64Encoded), arg0)
+}
+
+// AddFile mocks base method
+func (m *MockInterface) AddFile(arg0 string) error {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "AddFile", arg0)
+	ret0, _ := ret[0].(error)
+	return ret0
+}
+
+// AddFile indicates an expected call of AddFile
+func (mr *MockInterfaceMockRecorder) AddFile(arg0 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "AddFile", reflect.TypeOf((*MockInterface)(nil).AddFile), arg0)
+}
+
+// SetRootCAs mocks base method
+func (m *MockInterface) SetRootCAs(arg0 *tls.Config) {
+	m.ctrl.T.Helper()
+	m.ctrl.Call(m, "SetRootCAs", arg0)
+}
+
+// SetRootCAs indicates an expected call of SetRootCAs
+func (mr *MockInterfaceMockRecorder) SetRootCAs(arg0 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "SetRootCAs", reflect.TypeOf((*MockInterface)(nil).SetRootCAs), arg0)
+}

pkg/adaptors/certpool/testdata/Makefile

@@ -0,0 +1,28 @@
+all: ca1.crt ca1.crt.base64 ca2.crt ca2.crt.base64 ca3.crt ca3.crt.base64
+
+.PHONY: clean
+clean:
+	-rm -v *.key *.csr *.crt *.base64
+
+%.key:
+	openssl genrsa -out $@ 1024
+
+%.csr: %.key
+	openssl req \
+		-new \
+		-key $< \
+		-subj "/CN=Hello" \
+		-days 3650 \
+		-out $@
+	openssl req -noout -text -in $@
+
+%.crt: %.csr %.key
+	openssl x509 -req \
+		-signkey $*.key \
+		-in $*.csr \
+		-days 3650 \
+		-out $@
+	openssl x509 -text -in $@
+
+%.crt.base64: %.crt
+	base64 -i $< -o $@

pkg/adaptors/certpool/testdata/ca1.crt

@@ -0,0 +1,11 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----

pkg/adaptors/certpool/testdata/ca1.crt.base64

@@ -0,0 +1 @@
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

pkg/adaptors/certpool/testdata/ca2.crt

@@ -0,0 +1,11 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----

pkg/adaptors/certpool/testdata/ca2.crt.base64

@@ -0,0 +1 @@
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

pkg/adaptors/certpool/testdata/ca3.crt

@@ -0,0 +1,11 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----

pkg/adaptors/certpool/testdata/ca3.crt.base64

@@ -0,0 +1 @@
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

pkg/adaptors/cmd/cmd.go

@@ -0,0 +1,70 @@
+package cmd
+
+import (
+	"context"
+	"path/filepath"
+
+	"github.com/google/wire"
+	"github.com/int128/kubelogin/pkg/adaptors/logger"
+	"github.com/spf13/cobra"
+	"k8s.io/client-go/util/homedir"
+)
+
+// Set provides an implementation and interface for Cmd.
+var Set = wire.NewSet(
+	wire.Struct(new(Cmd), "*"),
+	wire.Bind(new(Interface), new(*Cmd)),
+	wire.Struct(new(Root), "*"),
+	wire.Struct(new(GetToken), "*"),
+	wire.Struct(new(Setup), "*"),
+)
+
+type Interface interface {
+	Run(ctx context.Context, args []string, version string) int
+}
+
+var defaultListenAddress = []string{"127.0.0.1:8000", "127.0.0.1:18000"}
+var defaultTokenCacheDir = homedir.HomeDir() + "/.kube/cache/oidc-login"
+
+// Cmd provides interaction with command line interface (CLI).
+type Cmd struct {
+	Root     *Root
+	GetToken *GetToken
+	Setup    *Setup
+	Logger   logger.Interface
+}
+
+// Run parses the command line arguments and executes the specified use-case.
+// It returns an exit code, that is 0 on success or 1 on error.
+func (cmd *Cmd) Run(ctx context.Context, args []string, version string) int {
+	executable := filepath.Base(args[0])
+
+	rootCmd := cmd.Root.New(ctx, executable)
+	rootCmd.Version = version
+	rootCmd.SilenceUsage = true
+	rootCmd.SilenceErrors = true
+
+	getTokenCmd := cmd.GetToken.New(ctx)
+	rootCmd.AddCommand(getTokenCmd)
+
+	setupCmd := cmd.Setup.New(ctx)
+	rootCmd.AddCommand(setupCmd)
+
+	versionCmd := &cobra.Command{
+		Use:   "version",
+		Short: "Print the version information",
+		Args:  cobra.NoArgs,
+		Run: func(*cobra.Command, []string) {
+			cmd.Logger.Printf("%s version %s", executable, version)
+		},
+	}
+	rootCmd.AddCommand(versionCmd)
+
+	rootCmd.SetArgs(args[1:])
+	if err := rootCmd.Execute(); err != nil {
+		cmd.Logger.Printf("error: %s", err)
+		cmd.Logger.V(1).Infof("stacktrace: %+v", err)
+		return 1
+	}
+	return 0
+}

pkg/adaptors/cmd/cmd_test.go

@@ -0,0 +1,362 @@
+package cmd
+
+import (
+	"context"
+	"testing"
+
+	"github.com/golang/mock/gomock"
+	"github.com/int128/kubelogin/pkg/adaptors/logger/mock_logger"
+	"github.com/int128/kubelogin/pkg/usecases/authentication"
+	"github.com/int128/kubelogin/pkg/usecases/credentialplugin"
+	"github.com/int128/kubelogin/pkg/usecases/credentialplugin/mock_credentialplugin"
+	"github.com/int128/kubelogin/pkg/usecases/standalone"
+	"github.com/int128/kubelogin/pkg/usecases/standalone/mock_standalone"
+)
+
+func TestCmd_Run(t *testing.T) {
+	const executable = "kubelogin"
+	const version = "HEAD"
+
+	t.Run("root", func(t *testing.T) {
+		tests := map[string]struct {
+			args []string
+			in   standalone.Input
+		}{
+			"Defaults": {
+				args: []string{executable},
+				in: standalone.Input{
+					GrantOptionSet: authentication.GrantOptionSet{
+						AuthCodeOption: &authentication.AuthCodeOption{
+							BindAddress: defaultListenAddress,
+						},
+					},
+				},
+			},
+			"when --listen-port is set, it should convert the port to address": {
+				args: []string{
+					executable,
+					"--listen-port", "10080",
+					"--listen-port", "20080",
+				},
+				in: standalone.Input{
+					GrantOptionSet: authentication.GrantOptionSet{
+						AuthCodeOption: &authentication.AuthCodeOption{
+							BindAddress: []string{"127.0.0.1:10080", "127.0.0.1:20080"},
+						},
+					},
+				},
+			},
+			"when --listen-port is set, it should ignore --listen-address flags": {
+				args: []string{
+					executable,
+					"--listen-port", "10080",
+					"--listen-port", "20080",
+					"--listen-address", "127.0.0.1:30080",
+					"--listen-address", "127.0.0.1:40080",
+				},
+				in: standalone.Input{
+					GrantOptionSet: authentication.GrantOptionSet{
+						AuthCodeOption: &authentication.AuthCodeOption{
+							BindAddress: []string{"127.0.0.1:10080", "127.0.0.1:20080"},
+						},
+					},
+				},
+			},
+			"FullOptions": {
+				args: []string{executable,
+					"--kubeconfig", "/path/to/kubeconfig",
+					"--context", "hello.k8s.local",
+					"--user", "google",
+					"--certificate-authority", "/path/to/cacert",
+					"--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",
+					"--username", "USER",
+					"--password", "PASS",
+				},
+				in: standalone.Input{
+					KubeconfigFilename: "/path/to/kubeconfig",
+					KubeconfigContext:  "hello.k8s.local",
+					KubeconfigUser:     "google",
+					CACertFilename:     "/path/to/cacert",
+					SkipTLSVerify:      true,
+					GrantOptionSet: authentication.GrantOptionSet{
+						AuthCodeOption: &authentication.AuthCodeOption{
+							BindAddress:     []string{"127.0.0.1:10080", "127.0.0.1:20080"},
+							SkipOpenBrowser: true,
+						},
+					},
+				},
+			},
+			"GrantType=authcode-keyboard": {
+				args: []string{executable,
+					"--grant-type", "authcode-keyboard",
+				},
+				in: standalone.Input{
+					GrantOptionSet: authentication.GrantOptionSet{
+						AuthCodeKeyboardOption: &authentication.AuthCodeKeyboardOption{},
+					},
+				},
+			},
+			"GrantType=password": {
+				args: []string{executable,
+					"--grant-type", "password",
+					"--listen-address", "127.0.0.1:10080",
+					"--listen-address", "127.0.0.1:20080",
+					"--username", "USER",
+					"--password", "PASS",
+				},
+				in: standalone.Input{
+					GrantOptionSet: authentication.GrantOptionSet{
+						ROPCOption: &authentication.ROPCOption{
+							Username: "USER",
+							Password: "PASS",
+						},
+					},
+				},
+			},
+			"GrantType=auto": {
+				args: []string{executable,
+					"--listen-address", "127.0.0.1:10080",
+					"--listen-address", "127.0.0.1:20080",
+					"--username", "USER",
+					"--password", "PASS",
+				},
+				in: standalone.Input{
+					GrantOptionSet: authentication.GrantOptionSet{
+						ROPCOption: &authentication.ROPCOption{
+							Username: "USER",
+							Password: "PASS",
+						},
+					},
+				},
+			},
+		}
+		for name, c := range tests {
+			t.Run(name, func(t *testing.T) {
+				ctrl := gomock.NewController(t)
+				defer ctrl.Finish()
+				ctx := context.TODO()
+				mockStandalone := mock_standalone.NewMockInterface(ctrl)
+				mockStandalone.EXPECT().
+					Do(ctx, c.in)
+				cmd := Cmd{
+					Root: &Root{
+						Standalone: mockStandalone,
+						Logger:     mock_logger.New(t),
+					},
+					Logger: mock_logger.New(t),
+				}
+				exitCode := cmd.Run(ctx, c.args, version)
+				if exitCode != 0 {
+					t.Errorf("exitCode wants 0 but %d", exitCode)
+				}
+			})
+		}
+
+		t.Run("TooManyArgs", func(t *testing.T) {
+			ctrl := gomock.NewController(t)
+			defer ctrl.Finish()
+			cmd := Cmd{
+				Root: &Root{
+					Standalone: mock_standalone.NewMockInterface(ctrl),
+					Logger:     mock_logger.New(t),
+				},
+				Logger: mock_logger.New(t),
+			}
+			exitCode := cmd.Run(context.TODO(), []string{executable, "some"}, version)
+			if exitCode != 1 {
+				t.Errorf("exitCode wants 1 but %d", exitCode)
+			}
+		})
+	})
+
+	t.Run("get-token", func(t *testing.T) {
+		tests := map[string]struct {
+			args []string
+			in   credentialplugin.Input
+		}{
+			"Defaults": {
+				args: []string{executable,
+					"get-token",
+					"--oidc-issuer-url", "https://issuer.example.com",
+					"--oidc-client-id", "YOUR_CLIENT_ID",
+				},
+				in: credentialplugin.Input{
+					TokenCacheDir: defaultTokenCacheDir,
+					IssuerURL:     "https://issuer.example.com",
+					ClientID:      "YOUR_CLIENT_ID",
+					GrantOptionSet: authentication.GrantOptionSet{
+						AuthCodeOption: &authentication.AuthCodeOption{
+							BindAddress: []string{"127.0.0.1:8000", "127.0.0.1:18000"},
+						},
+					},
+				},
+			},
+			"FullOptions": {
+				args: []string{executable,
+					"get-token",
+					"--oidc-issuer-url", "https://issuer.example.com",
+					"--oidc-client-id", "YOUR_CLIENT_ID",
+					"--oidc-client-secret", "YOUR_CLIENT_SECRET",
+					"--oidc-extra-scope", "email",
+					"--oidc-extra-scope", "profile",
+					"--certificate-authority", "/path/to/cacert",
+					"--certificate-authority-data", "BASE64ENCODED",
+					"--insecure-skip-tls-verify",
+					"-v1",
+					"--grant-type", "authcode",
+					"--listen-address", "127.0.0.1:10080",
+					"--listen-address", "127.0.0.1:20080",
+					"--skip-open-browser",
+					"--username", "USER",
+					"--password", "PASS",
+				},
+				in: credentialplugin.Input{
+					TokenCacheDir:  defaultTokenCacheDir,
+					IssuerURL:      "https://issuer.example.com",
+					ClientID:       "YOUR_CLIENT_ID",
+					ClientSecret:   "YOUR_CLIENT_SECRET",
+					ExtraScopes:    []string{"email", "profile"},
+					CACertFilename: "/path/to/cacert",
+					CACertData:     "BASE64ENCODED",
+					SkipTLSVerify:  true,
+					GrantOptionSet: authentication.GrantOptionSet{
+						AuthCodeOption: &authentication.AuthCodeOption{
+							BindAddress:     []string{"127.0.0.1:10080", "127.0.0.1:20080"},
+							SkipOpenBrowser: true,
+						},
+					},
+				},
+			},
+			"GrantType=authcode-keyboard": {
+				args: []string{executable,
+					"get-token",
+					"--oidc-issuer-url", "https://issuer.example.com",
+					"--oidc-client-id", "YOUR_CLIENT_ID",
+					"--grant-type", "authcode-keyboard",
+				},
+				in: credentialplugin.Input{
+					TokenCacheDir: defaultTokenCacheDir,
+					IssuerURL:     "https://issuer.example.com",
+					ClientID:      "YOUR_CLIENT_ID",
+					GrantOptionSet: authentication.GrantOptionSet{
+						AuthCodeKeyboardOption: &authentication.AuthCodeKeyboardOption{},
+					},
+				},
+			},
+			"GrantType=password": {
+				args: []string{executable,
+					"get-token",
+					"--oidc-issuer-url", "https://issuer.example.com",
+					"--oidc-client-id", "YOUR_CLIENT_ID",
+					"--grant-type", "password",
+					"--listen-address", "127.0.0.1:10080",
+					"--listen-address", "127.0.0.1:20080",
+					"--username", "USER",
+					"--password", "PASS",
+				},
+				in: credentialplugin.Input{
+					TokenCacheDir: defaultTokenCacheDir,
+					IssuerURL:     "https://issuer.example.com",
+					ClientID:      "YOUR_CLIENT_ID",
+					GrantOptionSet: authentication.GrantOptionSet{
+						ROPCOption: &authentication.ROPCOption{
+							Username: "USER",
+							Password: "PASS",
+						},
+					},
+				},
+			},
+			"GrantType=auto": {
+				args: []string{executable,
+					"get-token",
+					"--oidc-issuer-url", "https://issuer.example.com",
+					"--oidc-client-id", "YOUR_CLIENT_ID",
+					"--listen-address", "127.0.0.1:10080",
+					"--listen-address", "127.0.0.1:20080",
+					"--username", "USER",
+					"--password", "PASS",
+				},
+				in: credentialplugin.Input{
+					TokenCacheDir: defaultTokenCacheDir,
+					IssuerURL:     "https://issuer.example.com",
+					ClientID:      "YOUR_CLIENT_ID",
+					GrantOptionSet: authentication.GrantOptionSet{
+						ROPCOption: &authentication.ROPCOption{
+							Username: "USER",
+							Password: "PASS",
+						},
+					},
+				},
+			},
+		}
+		for name, c := range tests {
+			t.Run(name, func(t *testing.T) {
+				ctrl := gomock.NewController(t)
+				defer ctrl.Finish()
+				ctx := context.TODO()
+				getToken := mock_credentialplugin.NewMockInterface(ctrl)
+				getToken.EXPECT().
+					Do(ctx, c.in)
+				cmd := Cmd{
+					Root: &Root{
+						Logger: mock_logger.New(t),
+					},
+					GetToken: &GetToken{
+						GetToken: getToken,
+						Logger:   mock_logger.New(t),
+					},
+					Logger: mock_logger.New(t),
+				}
+				exitCode := cmd.Run(ctx, c.args, version)
+				if exitCode != 0 {
+					t.Errorf("exitCode wants 0 but %d", exitCode)
+				}
+			})
+		}
+
+		t.Run("MissingMandatoryOptions", func(t *testing.T) {
+			ctrl := gomock.NewController(t)
+			defer ctrl.Finish()
+			ctx := context.TODO()
+			cmd := Cmd{
+				Root: &Root{
+					Logger: mock_logger.New(t),
+				},
+				GetToken: &GetToken{
+					GetToken: mock_credentialplugin.NewMockInterface(ctrl),
+					Logger:   mock_logger.New(t),
+				},
+				Logger: mock_logger.New(t),
+			}
+			exitCode := cmd.Run(ctx, []string{executable, "get-token"}, version)
+			if exitCode != 1 {
+				t.Errorf("exitCode wants 1 but %d", exitCode)
+			}
+		})
+
+		t.Run("TooManyArgs", func(t *testing.T) {
+			ctrl := gomock.NewController(t)
+			defer ctrl.Finish()
+			ctx := context.TODO()
+			cmd := Cmd{
+				Root: &Root{
+					Logger: mock_logger.New(t),
+				},
+				GetToken: &GetToken{
+					GetToken: mock_credentialplugin.NewMockInterface(ctrl),
+					Logger:   mock_logger.New(t),
+				},
+				Logger: mock_logger.New(t),
+			}
+			exitCode := cmd.Run(ctx, []string{executable, "get-token", "foo"}, version)
+			if exitCode != 1 {
+				t.Errorf("exitCode wants 1 but %d", exitCode)
+			}
+		})
+	})
+}

pkg/adaptors/cmd/get_token.go

@@ -0,0 +1,85 @@
+package cmd
+
+import (
+	"context"
+
+	"github.com/int128/kubelogin/pkg/adaptors/logger"
+	"github.com/int128/kubelogin/pkg/usecases/credentialplugin"
+	"github.com/spf13/cobra"
+	"github.com/spf13/pflag"
+	"golang.org/x/xerrors"
+)
+
+// getTokenOptions represents the options for get-token command.
+type getTokenOptions struct {
+	IssuerURL             string
+	ClientID              string
+	ClientSecret          string
+	ExtraScopes           []string
+	CACertFilename        string
+	CACertData            string
+	SkipTLSVerify         bool
+	TokenCacheDir         string
+	authenticationOptions authenticationOptions
+}
+
+func (o *getTokenOptions) register(f *pflag.FlagSet) {
+	f.SortFlags = false
+	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)
+}
+
+type GetToken struct {
+	GetToken credentialplugin.Interface
+	Logger   logger.Interface
+}
+
+func (cmd *GetToken) New(ctx context.Context) *cobra.Command {
+	var o getTokenOptions
+	c := &cobra.Command{
+		Use:   "get-token [flags]",
+		Short: "Run as a kubectl credential plugin",
+		Args: func(c *cobra.Command, args []string) error {
+			if err := cobra.NoArgs(c, args); err != nil {
+				return err
+			}
+			if o.IssuerURL == "" {
+				return xerrors.New("--oidc-issuer-url is missing")
+			}
+			if o.ClientID == "" {
+				return xerrors.New("--oidc-client-id is missing")
+			}
+			return nil
+		},
+		RunE: func(*cobra.Command, []string) error {
+			grantOptionSet, err := o.authenticationOptions.grantOptionSet()
+			if err != nil {
+				return xerrors.Errorf("error: %w", err)
+			}
+			in := credentialplugin.Input{
+				IssuerURL:      o.IssuerURL,
+				ClientID:       o.ClientID,
+				ClientSecret:   o.ClientSecret,
+				ExtraScopes:    o.ExtraScopes,
+				CACertFilename: o.CACertFilename,
+				CACertData:     o.CACertData,
+				SkipTLSVerify:  o.SkipTLSVerify,
+				TokenCacheDir:  o.TokenCacheDir,
+				GrantOptionSet: grantOptionSet,
+			}
+			if err := cmd.GetToken.Do(ctx, in); err != nil {
+				return xerrors.Errorf("error: %w", err)
+			}
+			return nil
+		},
+	}
+	o.register(c.Flags())
+	return c
+}

pkg/adaptors/cmd/root.go

@@ -0,0 +1,142 @@
+package cmd
+
+import (
+	"context"
+	"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.
+
+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.
+`
+
+// rootOptions represents the options for the root command.
+type rootOptions struct {
+	Kubeconfig            string
+	Context               string
+	User                  string
+	CertificateAuthority  string
+	SkipTLSVerify         bool
+	authenticationOptions authenticationOptions
+}
+
+func (o *rootOptions) register(f *pflag.FlagSet) {
+	f.SortFlags = false
+	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
+}
+
+type Root struct {
+	Standalone standalone.Interface
+	Logger     logger.Interface
+}
+
+func (cmd *Root) New(ctx context.Context, executable string) *cobra.Command {
+	var o rootOptions
+	rootCmd := &cobra.Command{
+		Use:   executable,
+		Short: "Login to the OpenID Connect provider",
+		Long:  longDescription,
+		Args:  cobra.NoArgs,
+		RunE: func(*cobra.Command, []string) error {
+			grantOptionSet, err := o.authenticationOptions.grantOptionSet()
+			if err != nil {
+				return xerrors.Errorf("invalid option: %w", err)
+			}
+			in := standalone.Input{
+				KubeconfigFilename: o.Kubeconfig,
+				KubeconfigContext:  kubeconfig.ContextName(o.Context),
+				KubeconfigUser:     kubeconfig.UserName(o.User),
+				CACertFilename:     o.CertificateAuthority,
+				SkipTLSVerify:      o.SkipTLSVerify,
+				GrantOptionSet:     grantOptionSet,
+			}
+			if err := cmd.Standalone.Do(ctx, in); err != nil {
+				return xerrors.Errorf("error: %w", err)
+			}
+			return nil
+		},
+	}
+	o.register(rootCmd.Flags())
+	cmd.Logger.AddFlags(rootCmd.PersistentFlags())
+	return rootCmd
+}

pkg/adaptors/cmd/setup.go

@@ -0,0 +1,76 @@
+package cmd
+
+import (
+	"context"
+
+	"github.com/int128/kubelogin/pkg/usecases/setup"
+	"github.com/spf13/cobra"
+	"github.com/spf13/pflag"
+	"golang.org/x/xerrors"
+)
+
+// setupOptions represents the options for setup command.
+type setupOptions struct {
+	IssuerURL             string
+	ClientID              string
+	ClientSecret          string
+	ExtraScopes           []string
+	CACertFilename        string
+	CACertData            string
+	SkipTLSVerify         bool
+	authenticationOptions authenticationOptions
+}
+
+func (o *setupOptions) register(f *pflag.FlagSet) {
+	f.SortFlags = false
+	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)
+}
+
+type Setup struct {
+	Setup setup.Interface
+}
+
+func (cmd *Setup) New(ctx context.Context) *cobra.Command {
+	var o setupOptions
+	c := &cobra.Command{
+		Use:   "setup",
+		Short: "Show the setup instruction",
+		Args:  cobra.NoArgs,
+		RunE: func(c *cobra.Command, _ []string) error {
+			grantOptionSet, err := o.authenticationOptions.grantOptionSet()
+			if err != nil {
+				return xerrors.Errorf("error: %w", err)
+			}
+			in := setup.Stage2Input{
+				IssuerURL:      o.IssuerURL,
+				ClientID:       o.ClientID,
+				ClientSecret:   o.ClientSecret,
+				ExtraScopes:    o.ExtraScopes,
+				CACertFilename: o.CACertFilename,
+				CACertData:     o.CACertData,
+				SkipTLSVerify:  o.SkipTLSVerify,
+				GrantOptionSet: grantOptionSet,
+			}
+			if c.Flags().Lookup("listen-address").Changed {
+				in.ListenAddressArgs = o.authenticationOptions.ListenAddress
+			}
+			if in.IssuerURL == "" || in.ClientID == "" {
+				cmd.Setup.DoStage1()
+				return nil
+			}
+			if err := cmd.Setup.DoStage2(ctx, in); err != nil {
+				return xerrors.Errorf("error: %w", err)
+			}
+			return nil
+		},
+	}
+	o.register(c.Flags())
+	return c
+}

pkg/adaptors/credentialpluginwriter/credential_plugin.go

@@ -0,0 +1,51 @@
+// Package credentialpluginwriter provides a writer for a credential plugin.
+package credentialpluginwriter
+
+import (
+	"encoding/json"
+	"os"
+	"time"
+
+	"github.com/google/wire"
+	"golang.org/x/xerrors"
+	"k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/client-go/pkg/apis/clientauthentication/v1beta1"
+)
+
+//go:generate mockgen -destination mock_credentialpluginwriter/mock_credentialpluginwriter.go github.com/int128/kubelogin/pkg/adaptors/credentialpluginwriter Interface
+
+var Set = wire.NewSet(
+	wire.Struct(new(Writer), "*"),
+	wire.Bind(new(Interface), new(*Writer)),
+)
+
+type Interface interface {
+	Write(out Output) error
+}
+
+// Output represents an output object of the credential plugin.
+type Output struct {
+	Token  string
+	Expiry time.Time
+}
+
+type Writer struct{}
+
+// Write writes the ExecCredential to standard output for kubectl.
+func (*Writer) Write(out Output) error {
+	ec := &v1beta1.ExecCredential{
+		TypeMeta: v1.TypeMeta{
+			APIVersion: "client.authentication.k8s.io/v1beta1",
+			Kind:       "ExecCredential",
+		},
+		Status: &v1beta1.ExecCredentialStatus{
+			Token:               out.Token,
+			ExpirationTimestamp: &v1.Time{Time: out.Expiry},
+		},
+	}
+	e := json.NewEncoder(os.Stdout)
+	if err := e.Encode(ec); err != nil {
+		return xerrors.Errorf("could not write the ExecCredential: %w", err)
+	}
+	return nil
+}

pkg/adaptors/credentialpluginwriter/mock_credentialpluginwriter/mock_credentialpluginwriter.go

@@ -0,0 +1,48 @@
+// Code generated by MockGen. DO NOT EDIT.
+// Source: github.com/int128/kubelogin/pkg/adaptors/credentialpluginwriter (interfaces: Interface)
+
+// Package mock_credentialpluginwriter is a generated GoMock package.
+package mock_credentialpluginwriter
+
+import (
+	gomock "github.com/golang/mock/gomock"
+	credentialpluginwriter "github.com/int128/kubelogin/pkg/adaptors/credentialpluginwriter"
+	reflect "reflect"
+)
+
+// MockInterface is a mock of Interface interface
+type MockInterface struct {
+	ctrl     *gomock.Controller
+	recorder *MockInterfaceMockRecorder
+}
+
+// MockInterfaceMockRecorder is the mock recorder for MockInterface
+type MockInterfaceMockRecorder struct {
+	mock *MockInterface
+}
+
+// NewMockInterface creates a new mock instance
+func NewMockInterface(ctrl *gomock.Controller) *MockInterface {
+	mock := &MockInterface{ctrl: ctrl}
+	mock.recorder = &MockInterfaceMockRecorder{mock}
+	return mock
+}
+
+// EXPECT returns an object that allows the caller to indicate expected use
+func (m *MockInterface) EXPECT() *MockInterfaceMockRecorder {
+	return m.recorder
+}
+
+// Write mocks base method
+func (m *MockInterface) Write(arg0 credentialpluginwriter.Output) error {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Write", arg0)
+	ret0, _ := ret[0].(error)
+	return ret0
+}
+
+// Write indicates an expected call of Write
+func (mr *MockInterfaceMockRecorder) Write(arg0 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Write", reflect.TypeOf((*MockInterface)(nil).Write), arg0)
+}

pkg/adaptors/env/env.go

@@ -0,0 +1,66 @@
+// Package env provides environment dependent facilities.
+package env
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strings"
+	"syscall"
+	"time"
+
+	"github.com/google/wire"
+	"golang.org/x/crypto/ssh/terminal"
+	"golang.org/x/xerrors"
+)
+
+//go:generate mockgen -destination mock_env/mock_env.go github.com/int128/kubelogin/pkg/adaptors/env Interface
+
+// Set provides an implementation and interface for Env.
+var Set = wire.NewSet(
+	wire.Struct(new(Env), "*"),
+	wire.Bind(new(Interface), new(*Env)),
+)
+
+type Interface interface {
+	ReadString(prompt string) (string, error)
+	ReadPassword(prompt string) (string, error)
+	Now() time.Time
+}
+
+// Env provides environment specific facilities.
+type Env struct{}
+
+// ReadString reads a string from the stdin.
+func (*Env) ReadString(prompt string) (string, error) {
+	if _, err := fmt.Fprint(os.Stderr, prompt); err != nil {
+		return "", xerrors.Errorf("could not write the prompt: %w", err)
+	}
+	r := bufio.NewReader(os.Stdin)
+	s, err := r.ReadString('\n')
+	if err != nil {
+		return "", xerrors.Errorf("could not read from stdin: %w", err)
+	}
+	s = strings.TrimRight(s, "\r\n")
+	return s, nil
+}
+
+// ReadPassword reads a password from the stdin without echo back.
+func (*Env) ReadPassword(prompt string) (string, error) {
+	if _, err := fmt.Fprint(os.Stderr, prompt); err != nil {
+		return "", xerrors.Errorf("could not write the prompt: %w", err)
+	}
+	b, err := terminal.ReadPassword(int(syscall.Stdin))
+	if err != nil {
+		return "", xerrors.Errorf("could not read from stdin: %w", err)
+	}
+	if _, err := fmt.Fprintln(os.Stderr); err != nil {
+		return "", xerrors.Errorf("could not write a new line: %w", err)
+	}
+	return string(b), nil
+}
+
+// Now returns the current time.
+func (*Env) Now() time.Time {
+	return time.Now()
+}

pkg/adaptors/env/mock_env/mock_env.go

@@ -0,0 +1,78 @@
+// Code generated by MockGen. DO NOT EDIT.
+// Source: github.com/int128/kubelogin/pkg/adaptors/env (interfaces: Interface)
+
+// Package mock_env is a generated GoMock package.
+package mock_env
+
+import (
+	gomock "github.com/golang/mock/gomock"
+	reflect "reflect"
+	time "time"
+)
+
+// MockInterface is a mock of Interface interface
+type MockInterface struct {
+	ctrl     *gomock.Controller
+	recorder *MockInterfaceMockRecorder
+}
+
+// MockInterfaceMockRecorder is the mock recorder for MockInterface
+type MockInterfaceMockRecorder struct {
+	mock *MockInterface
+}
+
+// NewMockInterface creates a new mock instance
+func NewMockInterface(ctrl *gomock.Controller) *MockInterface {
+	mock := &MockInterface{ctrl: ctrl}
+	mock.recorder = &MockInterfaceMockRecorder{mock}
+	return mock
+}
+
+// EXPECT returns an object that allows the caller to indicate expected use
+func (m *MockInterface) EXPECT() *MockInterfaceMockRecorder {
+	return m.recorder
+}
+
+// Now mocks base method
+func (m *MockInterface) Now() time.Time {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Now")
+	ret0, _ := ret[0].(time.Time)
+	return ret0
+}
+
+// Now indicates an expected call of Now
+func (mr *MockInterfaceMockRecorder) Now() *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Now", reflect.TypeOf((*MockInterface)(nil).Now))
+}
+
+// ReadPassword mocks base method
+func (m *MockInterface) ReadPassword(arg0 string) (string, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "ReadPassword", arg0)
+	ret0, _ := ret[0].(string)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// 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
+func (m *MockInterface) ReadString(arg0 string) (string, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "ReadString", arg0)
+	ret0, _ := ret[0].(string)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// 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/jwtdecoder/decoder.go

@@ -0,0 +1,68 @@
+// Package jwtdecoder provides decoding a JWT.
+package jwtdecoder
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"strings"
+	"time"
+
+	"github.com/dgrijalva/jwt-go"
+	"github.com/google/wire"
+	"github.com/int128/kubelogin/pkg/domain/oidc"
+	"golang.org/x/xerrors"
+)
+
+//go:generate mockgen -destination mock_jwtdecoder/mock_jwtdecoder.go github.com/int128/kubelogin/pkg/adaptors/jwtdecoder Interface
+
+// Set provides an implementation and interface.
+var Set = wire.NewSet(
+	wire.Struct(new(Decoder), "*"),
+	wire.Bind(new(Interface), new(*Decoder)),
+)
+
+type Interface interface {
+	Decode(s string) (*oidc.Claims, error)
+}
+
+type Decoder struct{}
+
+// Decode returns the claims of the JWT.
+// Note that this method does not verify the signature and always trust it.
+func (d *Decoder) Decode(s string) (*oidc.Claims, error) {
+	parts := strings.Split(s, ".")
+	if len(parts) != 3 {
+		return nil, xerrors.Errorf("token contains an invalid number of segments")
+	}
+	b, err := jwt.DecodeSegment(parts[1])
+	if err != nil {
+		return nil, xerrors.Errorf("could not decode the token: %w", err)
+	}
+	var claims jwt.StandardClaims
+	if err := json.NewDecoder(bytes.NewBuffer(b)).Decode(&claims); err != nil {
+		return nil, xerrors.Errorf("could not decode the json of token: %w", err)
+	}
+	var rawClaims map[string]interface{}
+	if err := json.NewDecoder(bytes.NewBuffer(b)).Decode(&rawClaims); err != nil {
+		return nil, xerrors.Errorf("could not decode the json of token: %w", err)
+	}
+	return &oidc.Claims{
+		Subject: claims.Subject,
+		Expiry:  time.Unix(claims.ExpiresAt, 0),
+		Pretty:  dumpRawClaims(rawClaims),
+	}, nil
+}
+
+func dumpRawClaims(rawClaims map[string]interface{}) map[string]string {
+	claims := make(map[string]string)
+	for k, v := range rawClaims {
+		switch v := v.(type) {
+		case float64:
+			claims[k] = fmt.Sprintf("%.f", v)
+		default:
+			claims[k] = fmt.Sprintf("%v", v)
+		}
+	}
+	return claims
+}

pkg/adaptors/jwtdecoder/decoder_test.go

@@ -0,0 +1,87 @@
+package jwtdecoder
+
+import (
+	"crypto/rsa"
+	"crypto/x509"
+	"encoding/pem"
+	"io/ioutil"
+	"testing"
+	"time"
+
+	"github.com/dgrijalva/jwt-go"
+)
+
+func TestDecoder_Decode(t *testing.T) {
+	var decoder Decoder
+
+	t.Run("ValidToken", func(t *testing.T) {
+		expiry := time.Now().Round(time.Second)
+		idToken := newIDToken(t, "https://issuer.example.com", expiry)
+		decodedToken, err := decoder.Decode(idToken)
+		if err != nil {
+			t.Fatalf("Decode error: %s", err)
+		}
+		if decodedToken.Expiry != expiry {
+			t.Errorf("Expiry wants %s but %s", expiry, decodedToken.Expiry)
+		}
+		t.Logf("Pretty=%+v", decodedToken.Pretty)
+	})
+	t.Run("InvalidToken", func(t *testing.T) {
+		decodedToken, err := decoder.Decode("HEADER.INVALID_TOKEN.SIGNATURE")
+		if err == nil {
+			t.Errorf("error wants non-nil but nil")
+		} else {
+			t.Logf("expected error: %+v", err)
+		}
+		if decodedToken != nil {
+			t.Errorf("decodedToken wants nil but %+v", decodedToken)
+		}
+	})
+}
+
+func newIDToken(t *testing.T, issuer string, expiry time.Time) string {
+	t.Helper()
+	claims := struct {
+		jwt.StandardClaims
+		Nonce         string   `json:"nonce"`
+		Groups        []string `json:"groups"`
+		EmailVerified bool     `json:"email_verified"`
+	}{
+		StandardClaims: jwt.StandardClaims{
+			Issuer:    issuer,
+			Audience:  "kubernetes",
+			Subject:   "SUBJECT",
+			IssuedAt:  time.Now().Unix(),
+			ExpiresAt: expiry.Unix(),
+		},
+		Nonce:         "NONCE",
+		Groups:        []string{"admin", "users"},
+		EmailVerified: false,
+	}
+	token := jwt.NewWithClaims(jwt.SigningMethodRS256, claims)
+	s, err := token.SignedString(readPrivateKey(t, "testdata/jws.key"))
+	if err != nil {
+		t.Fatalf("Could not sign the claims: %s", err)
+	}
+	return s
+}
+
+func readPrivateKey(t *testing.T, name string) *rsa.PrivateKey {
+	t.Helper()
+	b, err := ioutil.ReadFile(name)
+	if err != nil {
+		t.Fatalf("could not read the file: %s", err)
+	}
+	block, rest := pem.Decode(b)
+	if block == nil {
+		t.Fatalf("could not decode PEM")
+	}
+	if len(rest) > 0 {
+		t.Fatalf("PEM should contain single key but multiple keys")
+	}
+	k, err := x509.ParsePKCS1PrivateKey(block.Bytes)
+	if err != nil {
+		t.Fatalf("could not parse the key: %s", err)
+	}
+	return k
+}