Add windows 32bit binary

2026-04-26 19:26:33 +00:00 · 2018-03-23 20:04:07 +09:00
147 changed files with 428 additions and 10279 deletions
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -1,19 +1,36 @@
-version: 2.1
-
+version: 2
 jobs:
-  release:
-    macos:
-      # https://circleci.com/docs/2.0/testing-ios/
-      xcode: 11.5.0
+  build:
+    docker:
+      - image: circleci/golang:1.10
+    working_directory: /go/src/github.com/int128/kubelogin
    steps:
      - checkout
+      - run: go get -v -t -d
+      - run: go get github.com/golang/lint/golint
+      - run: golint
+      - run: go build -v
+
+  release:
+    docker:
+      - image: circleci/golang:1.10
+    working_directory: /go/src/github.com/int128/kubelogin
+    steps:
+      - checkout
+      - run: go get -v -t -d
+      - run: go get github.com/mitchellh/gox
+      - run: go get github.com/tcnksm/ghr
+      - run: gox --osarch 'darwin/amd64 linux/amd64 windows/amd64 windows/386' -output 'dist/{{.Dir}}_{{.OS}}_{{.Arch}}'
+      - run: ghr -u "$CIRCLE_PROJECT_USERNAME" -r "$CIRCLE_PROJECT_REPONAME" "$CIRCLE_TAG" dist

 workflows:
  version: 2
  build:
    jobs:
+      - build
      - release:
-          context: open-source
          filters:
            branches:
-              only: /^dummy.*/
+              ignore: /.*/
+            tags:
+              only: /.*/
--- a/.editorconfig
+++ b/.editorconfig
@@ -0,0 +1,10 @@
+root = true
+
+[*]
+end_of_line = lf
+insert_final_newline = true
+indent_style = space
+indent_size = 2
+
+[*.go]
+indent_style = tab
--- a/.github/FUNDING.yml
+++ b/.github/FUNDING.yml
@@ -1,12 +0,0 @@
-# These are supported funding model platforms
-
-github: [int128] # Replace with up to 4 GitHub Sponsors-enabled usernames e.g., [user1, user2]
-patreon: # Replace with a single Patreon username
-open_collective: # Replace with a single Open Collective username
-ko_fi: # Replace with a single Ko-fi username
-tidelift: # Replace with a single Tidelift platform-name/package-name e.g., npm/babel
-community_bridge: # Replace with a single Community Bridge project-name e.g., cloud-foundry
-liberapay: # Replace with a single Liberapay username
-issuehunt: # Replace with a single IssueHunt username
-otechie: # Replace with a single Otechie username
-custom: # Replace with up to 4 custom sponsorship URLs e.g., ['link1', 'link2']
--- a/.github/ISSUE_TEMPLATE/bug_report.md
+++ b/.github/ISSUE_TEMPLATE/bug_report.md
@@ -1,20 +0,0 @@
---
-name: Bug report
-about: Create a report to help us improve
-title: ''
-labels: bug
-assignees: ''
-
---
-
-## Describe the issue
-A clear and concise description of what the issue is.
-
-## To reproduce
-A console log or steps to reproduce the issue.
-
-## Your environment
- OS: e.g. macOS
- kubelogin version: e.g. v1.19
- kubectl version: e.g. v1.19
- OpenID Connect provider: e.g. Google
--- a/.github/ISSUE_TEMPLATE/feature_request.md
+++ b/.github/ISSUE_TEMPLATE/feature_request.md
@@ -1,15 +0,0 @@
---
-name: Feature request
-about: Suggest an idea for this project
-title: ''
-labels: enhancement
-assignees: ''
-
---
-
-## Purpose of the feature (why)
-A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
-A clear and concise description of what you want to happen.
-
-## Your idea (how)
-A clear and concise description of any alternative solutions or features you've considered.
--- a/.github/ISSUE_TEMPLATE/question.md
+++ b/.github/ISSUE_TEMPLATE/question.md
@@ -1,20 +0,0 @@
---
-name: Question
-about: Feel free to ask a question
-title: ''
-labels: question
-assignees: ''
-
---
-
-## Describe the question
-A clear and concise description of what the issue is.
-
-## To reproduce
-A console log or steps to reproduce the issue.
-
-## Your environment
- OS: e.g. macOS
- kubelogin version: e.g. v1.19
- kubectl version: e.g. v1.19
- OpenID Connect provider: e.g. Google
--- a/.github/renovate.json
+++ b/.github/renovate.json
@@ -1,14 +0,0 @@
-{
-  "extends": [
-    "config:base"
-  ],
-  "packageRules": [
-    {
-      "updateTypes": ["minor", "patch", "digest"],
-      "automerge": true
-    }
-  ],
-  "postUpdateOptions": [
-    "gomodTidy"
-  ]
-}
--- a/.github/workflows/docker.yaml
+++ b/.github/workflows/docker.yaml
@@ -1,35 +0,0 @@
-name: docker
-
-on:
-  push:
-    branches:
-      - master
-    paths:
-      - .github/workflows/docker.yaml
-      - pkg/**
-      - go.*
-      - Dockerfile
-    tags:
-      - v*
-  pull_request:
-    branches:
-      - master
-    paths:
-      - .github/workflows/docker.yaml
-      - pkg/**
-      - go.*
-      - Dockerfile
-
-jobs:
-  build-and-push:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v2
-      - uses: docker/setup-qemu-action@v1
-      - uses: docker/setup-buildx-action@v1
-      - uses: docker/login-action@v1
-        with:
-          registry: ghcr.io
-          username: ${{ github.repository_owner }}
-          password: ${{ secrets.CR_PAT }}
-      - run: make docker-build-push
--- a/.github/workflows/go.yaml
+++ b/.github/workflows/go.yaml
@@ -1,99 +0,0 @@
-name: go
-
-on:
-  push:
-    branches:
-      - master
-    paths:
-      - .github/workflows/go.yaml
-      - pkg/**
-      - go.*
-    tags:
-      - v*
-  pull_request:
-    branches:
-      - master
-    paths:
-      - .github/workflows/go.yaml
-      - pkg/**
-      - go.*
-
-jobs:
-  lint:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v2
-      - uses: actions/setup-go@v2
-        with:
-          go-version: 1.16
-      - uses: golangci/golangci-lint-action@v2
-        with:
-          version: v1.38.0
-
-  test:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v2
-      - uses: actions/setup-go@v2
-        with:
-          go-version: 1.16
-      - uses: actions/cache@v2
-        with:
-          path: ~/go/pkg/mod
-          key: go-${{ runner.os }}-${{ hashFiles('**/go.sum') }}
-          restore-keys: |
-            go-${{ runner.os }}-
-      - run: go test -v -race -cover -coverprofile=coverage.out ./...
-      - uses: codecov/codecov-action@v1
-
-  release:
-    strategy:
-      matrix:
-        platform:
-          - os: ubuntu-latest
-            GOOS: linux
-            GOARCH: amd64
-          - os: ubuntu-latest
-            GOOS: linux
-            GOARCH: arm64
-          - os: ubuntu-latest
-            GOOS: linux
-            GOARCH: arm
-          - os: macos-latest
-            GOOS: darwin
-            GOARCH: amd64
-          - os: macos-latest
-            GOOS: darwin
-            GOARCH: arm64
-          - os: windows-latest
-            GOOS: windows
-            GOARCH: amd64
-    runs-on: ${{ matrix.platform.os }}
-    env:
-      GOOS: ${{ matrix.platform.GOOS }}
-      GOARCH: ${{ matrix.platform.GOARCH }}
-    steps:
-      - uses: actions/checkout@v2
-      - uses: actions/setup-go@v2
-        with:
-          go-version: 1.16
-      - uses: actions/cache@v2
-        with:
-          path: ~/go/pkg/mod
-          key: go-${{ matrix.platform.GOOS }}-${{ matrix.platform.GOARCH }}-${{ hashFiles('**/go.sum') }}
-          restore-keys: |
-            go-${{ matrix.platform.GOOS }}-${{ matrix.platform.GOARCH }}-
-      - run: make dist
-      - run: make dist-release
-        if: startswith(github.ref, 'refs/tags/')
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-
-  publish:
-    if: startswith(github.ref, 'refs/tags/')
-    needs:
-      - release
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v2
-      - uses: rajatjindal/krew-release-bot@v0.0.39
--- a/.github/workflows/system-test.yaml
+++ b/.github/workflows/system-test.yaml
@@ -1,42 +0,0 @@
-name: system-test
-
-on:
-  pull_request:
-    branches:
-      - master
-    paths:
-      - .github/workflows/system-test.yaml
-      - system_test/**
-      - pkg/**
-      - go.*
-  push:
-    branches:
-      - master
-    paths:
-      - .github/workflows/system-test.yaml
-      - system_test/**
-      - pkg/**
-      - go.*
-
-jobs:
-  system-test:
-    # https://help.github.com/en/actions/automating-your-workflow-with-github-actions/software-installed-on-github-hosted-runners#ubuntu-1804-lts
-    runs-on: ubuntu-18.04
-    steps:
-      - uses: actions/setup-go@v2
-        with:
-          go-version: 1.16
-        id: go
-      - uses: actions/checkout@v2
-      - uses: actions/cache@v2
-        with:
-          path: ~/go/pkg/mod
-          key: go-${{ hashFiles('**/go.sum') }}
-          restore-keys: |
-            go-
-      # https://packages.ubuntu.com/xenial/libnss3-tools
-      - run: sudo apt update
-      - run: sudo apt install -y libnss3-tools
-      - run: mkdir -p ~/.pki/nssdb
-      - run: echo '127.0.0.1 dex-server' | sudo tee -a /etc/hosts
-      - run: make -C system_test -j3
--- a/.gitignore
+++ b/.gitignore
@@ -1,10 +1 @@
-/.idea
-
-/acceptance_test/output/
-
-/coverage.out
-
 /kubelogin
-/kubectl-oidc_login
-/kubelogin_*.zip
-/kubelogin_*.zip.sha256
--- a/.krew.yaml
+++ b/.krew.yaml
@@ -1,62 +0,0 @@
-apiVersion: krew.googlecontainertools.github.com/v1alpha2
-kind: Plugin
-metadata:
-  name: oidc-login
-spec:
-  homepage: https://github.com/int128/kubelogin
-  shortDescription: Log in to the OpenID Connect provider
-  description: |
-    This is a kubectl plugin for Kubernetes OpenID Connect (OIDC) authentication.
-
-    ## Credential plugin mode
-    kubectl executes oidc-login before calling the Kubernetes APIs.
-    oidc-login automatically opens the browser and you can log in to the provider.
-    After authentication, kubectl gets the token from oidc-login and you can access the cluster.
-    See https://github.com/int128/kubelogin#credential-plugin-mode for more.
-
-    ## Standalone mode
-    Run `kubectl oidc-login`.
-    It automatically opens the browser and you can log in to the provider.
-    After authentication, it writes the token to the kubeconfig and you can access the cluster.
-    See https://github.com/int128/kubelogin#standalone-mode for more.
-
-  caveats: |
-    You need to setup the OIDC provider, Kubernetes API server, role binding and kubeconfig.
-  version: {{ .TagName }}
-  platforms:
-    - bin: kubelogin
-      {{ addURIAndSha "https://github.com/int128/kubelogin/releases/download/{{ TagName }}/kubelogin_linux_amd64.zip" .TagName }}
-      selector:
-        matchLabels:
-          os: linux
-          arch: amd64
-    - bin: kubelogin
-      {{ addURIAndSha "https://github.com/int128/kubelogin/releases/download/{{ TagName }}/kubelogin_linux_arm64.zip" .TagName }}
-      selector:
-        matchLabels:
-          os: linux
-          arch: arm64
-    - bin: kubelogin
-      {{ addURIAndSha "https://github.com/int128/kubelogin/releases/download/{{ TagName }}/kubelogin_linux_arm.zip" .TagName }}
-      selector:
-        matchLabels:
-          os: linux
-          arch: arm
-    - bin: kubelogin
-      {{ addURIAndSha "https://github.com/int128/kubelogin/releases/download/{{ TagName }}/kubelogin_darwin_amd64.zip" .TagName }}
-      selector:
-        matchLabels:
-          os: darwin
-          arch: amd64
-    - bin: kubelogin
-      {{ addURIAndSha "https://github.com/int128/kubelogin/releases/download/{{ TagName }}/kubelogin_darwin_arm64.zip" .TagName }}
-      selector:
-        matchLabels:
-          os: darwin
-          arch: arm64
-    - bin: kubelogin
-      {{ addURIAndSha "https://github.com/int128/kubelogin/releases/download/{{ TagName }}/kubelogin_windows_amd64.zip" .TagName }}
-      selector:
-        matchLabels:
-          os: windows
-          arch: amd64
--- a/14
+++ b/14
@@ -1,14 +0,0 @@
-FROM golang:1.16 as builder
-
-WORKDIR /builder
-COPY go.* .
-RUN go mod download
-COPY Makefile .
-COPY main.go .
-COPY pkg pkg
-ARG VERSION
-RUN make VERSION=$VERSION
-
-FROM gcr.io/distroless/base-debian10
-COPY --from=builder /builder/kubelogin /
-ENTRYPOINT ["/kubelogin"]
--- a/55
+++ b/55
@@ -1,55 +0,0 @@
-TARGET := kubelogin
-TARGET_ARCHIVE := $(TARGET)_$(GOOS)_$(GOARCH).zip
-TARGET_DIGEST := $(TARGET)_$(GOOS)_$(GOARCH).zip.sha256
-
-# determine the version from ref
-ifeq ($(GITHUB_REF), refs/heads/master)
-  VERSION := latest
-else
-  VERSION ?= $(notdir $(GITHUB_REF))
-endif
-
-LDFLAGS := -X main.version=$(VERSION)
-
-all: $(TARGET)
-
-$(TARGET):
-	go build -o $@ -ldflags "$(LDFLAGS)"
-
-.PHONY: dist
-dist: $(TARGET_ARCHIVE) $(TARGET_DIGEST)
-$(TARGET_ARCHIVE): $(TARGET)
-ifeq ($(GOOS), windows)
-	powershell Compress-Archive -Path $(TARGET),LICENSE,README.md -DestinationPath $@
-else
-	zip $@ $(TARGET) LICENSE README.md
-endif
-
-$(TARGET_DIGEST): $(TARGET_ARCHIVE)
-ifeq ($(GOOS), darwin)
-	shasum -a 256 -b $(TARGET_ARCHIVE) > $@
-else
-	sha256sum -b $(TARGET_ARCHIVE) > $@
-endif
-
-.PHONY: dist-release
-dist-release: dist
-	gh release upload $(VERSION) $(TARGET_ARCHIVE) $(TARGET_DIGEST) --clobber
-
-DOCKER_REPOSITORY := ghcr.io/int128/kubelogin
-
-.PHONY: docker-build-push
-docker-build-push: Dockerfile
-	docker buildx build . \
-		--build-arg=VERSION=$(VERSION) \
-		--tag=$(DOCKER_REPOSITORY):$(VERSION) \
-		--cache-from=type=registry,ref=$(DOCKER_REPOSITORY):latest \
-		--cache-to=type=inline \
-		--platform=linux/amd64,linux/arm64 \
-		--push
-
-.PHONY: clean
-clean:
-	-rm $(TARGET)
-	-rm -r dist/output/
-	-rm coverage.out gotest.log
--- a/README.md
+++ b/README.md
@@ -1,155 +1,129 @@
-# kubelogin [![CircleCI](https://circleci.com/gh/int128/kubelogin.svg?style=shield)](https://circleci.com/gh/int128/kubelogin) [![Go Report Card](https://goreportcard.com/badge/github.com/int128/kubelogin)](https://goreportcard.com/report/github.com/int128/kubelogin)
+# kubelogin [![CircleCI](https://circleci.com/gh/int128/kubelogin.svg?style=shield)](https://circleci.com/gh/int128/kubelogin)

-This is a kubectl plugin for [Kubernetes OpenID Connect (OIDC) authentication](https://kubernetes.io/docs/reference/access-authn-authz/authentication/#openid-connect-tokens), also known as `kubectl oidc-login`.
-
-Here is an example of Kubernetes authentication with the Google Identity Platform:
-
-<img alt="screencast" src="https://user-images.githubusercontent.com/321266/85427290-86e43700-b5b6-11ea-9e97-ffefd736c9b7.gif" width="572" height="391">
-
-Kubelogin is designed to run as a [client-go credential plugin](https://kubernetes.io/docs/reference/access-authn-authz/authentication/#client-go-credential-plugins).
-When you run kubectl, kubelogin opens the browser and you can log in to the provider.
-Then kubelogin gets a token from the provider and kubectl access Kubernetes APIs with the token.
-Take a look at the diagram:
-
-![Diagram of the credential plugin](docs/credential-plugin-diagram.svg)
+`kubelogin` is a command to get an OpenID Connect (OIDC) token for `kubectl` authentication.


 ## Getting Started

-### Setup
+Download [the latest release](https://github.com/int128/kubelogin/releases) and save it as `/usr/local/bin/kubelogin`.

-Install the latest release from [Homebrew](https://brew.sh/), [Krew](https://github.com/kubernetes-sigs/krew), [Chocolatey](https://chocolatey.org/packages/kubelogin) or [GitHub Releases](https://github.com/int128/kubelogin/releases).
+Run the command.

-```sh
-# Homebrew (macOS and Linux)
-brew install int128/kubelogin/kubelogin
+```
+% kubelogin
+2018/03/23 18:01:40 Reading config from /home/user/.kube/config
+2018/03/23 18:01:40 Using current context: hello.k8s.local
+2018/03/23 18:01:40 Using issuer: https://keycloak.example.com/auth/realms/hello
+2018/03/23 18:01:40 Using client ID: kubernetes
+2018/03/23 18:01:41 Starting OpenID Connect authentication:

-# Krew (macOS, Linux, Windows and ARM)
-kubectl krew install oidc-login
+## Automatic (recommended)

-# Chocolatey (Windows)
-choco install kubelogin
+Open the following URL in the web browser:
+
+http://localhost:8000/
+
+## Manual
+
+If you cannot access to localhost, instead open the following URL:
+
+https://keycloak.example.com/auth/realms/hello/protocol/openid-connect/auth?client_id=kubernetes&redirect_uri=urn%3Aietf%3Awg%3Aoauth%3A2.0%3Aoob&response_type=code&scope=openid+email&state=********
+
+Enter the code:
 ```

-You need to set up the OIDC provider, cluster role binding, Kubernetes API server and kubeconfig.
-The kubeconfig looks like:
+And then open http://localhost:8000.
+If you cannot access to localhost, you can choose manual interaction instead.
+
+`kubelogin` will update your `~/.kube/config` with the ID token and refresh token, as follows:

 ```yaml
+# ~/.kube/config (snip)
+current-context: hello.k8s.local
+contexts:
+- context:
+    cluster: hello.k8s.local
+    user: hello.k8s.local
+  name: hello.k8s.local
 users:
- name: oidc
+- name: hello.k8s.local
  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
+    auth-provider:
+      config:
+        idp-issuer-url: https://keycloak.example.com/auth/realms/hello
+        client-id: kubernetes
+        client-secret: YOUR_SECRET
+        id-token: ey...       # kubelogin will update ID token
+        refresh-token: ey...  # kubelogin will update refresh token
+      name: oidc
 ```

-See [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.
+Make sure you can access to the cluster:

 ```
-% kubectl get pods
-Open http://localhost:8000 for authentication
-NAME                          READY   STATUS    RESTARTS   AGE
-echoserver-86c78fdccd-nzmd5   1/1     Running   0          26d
+% kubectl version
+Client Version: version.Info{...}
+Server Version: version.Info{...}
 ```

-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.
+## Prerequisite

+You have to setup your OIDC identity provider and Kubernetes cluster.

-### Troubleshoot
+### 1. Setup OIDC Identity Provider

-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.
+This tutorial assumes you have created an OIDC client with the following:

-You can dump claims of an ID token by `setup` command.
+- Issuer URL: `https://keycloak.example.com/auth/realms/hello`
+- Client ID: `kubernetes`
+- Client Secret: `YOUR_CLIENT_SECRET`
+- Allowed redirect URLs:
+  - `http://localhost:8000/`
+  - `urn:ietf:wg:oauth:2.0:oob`
+- Groups claim: `groups` (optional for group based access controll)

-```console
-% kubectl oidc-login setup --oidc-issuer-url https://accounts.google.com --oidc-client-id REDACTED --oidc-client-secret REDACTED
-...
-You got a token with the following claims:
+### 2. Setup Kubernetes API Server

-{
-  "sub": "********",
-  "iss": "https://accounts.google.com",
-  "aud": "********",
-  ...
-}
-```
+Configure the Kubernetes API server allows your identity provider.

-You can increase the log level by `-v1` option.
+If you are using kops, `kops edit cluster` and append the following settings:

 ```yaml
-users:
- name: oidc
-  user:
-    exec:
-      apiVersion: client.authentication.k8s.io/v1beta1
-      command: kubectl
-      args:
-      - oidc-login
-      - get-token
-      - -v1
+spec:
+  kubeAPIServer:
+    oidcClientID: kubernetes
+    oidcGroupsClaim: groups
+    oidcIssuerURL: https://keycloak.example.com/auth/realms/hello
 ```

-You can verify kubelogin works with your provider using [acceptance test](acceptance_test).
+### 3. Setup kubectl

+Run the following script to configure `kubectl` uses your identity provider:

-## Docs
+```sh
+CLUSTER_NAME=hello.k8s.local

- [Setup guide](docs/setup.md)
- [Usage and options](docs/usage.md)
- [Standalone mode](docs/standalone-mode.md) (deprecated)
+kubectl config set-credentials $CLUSTER_NAME \
+  --auth-provider oidc \
+  --auth-provider-arg idp-issuer-url=https://keycloak.example.com/auth/realms/hello \
+  --auth-provider-arg client-id=kubernetes \
+  --auth-provider-arg client-secret=YOUR_CLIENT_SECRET

+# Set the context
+kubectl config set-context $CLUSTER_NAME --cluster $CLUSTER_NAME --user $CLUSTER_NAME
+```

-## Related works
-
-### Kubernetes Dashboard
-
-You can access the Kubernetes Dashboard using kubelogin and [kauthproxy](https://github.com/int128/kauthproxy).
+In actual team operation, you can distribute the script to your team members for easy setup.


 ## 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.
+Feel free to open issues and pull requests.

-Your pull request will be merged into master with squash.
-
-### Development
-
-Go 1.15+ is required.
+### How to build

 ```sh
-make
-./kubelogin
+go get github.com/int128/kubelogin
 ```
-
-See also:
-
- [system test](system_test)
- [acceptance_test](acceptance_test)
--- a/acceptance_test/Makefile
+++ b/acceptance_test/Makefile
@@ -1,42 +0,0 @@
-CLUSTER_NAME := kubelogin-acceptance-test
-OUTPUT_DIR := $(CURDIR)/output
-
-KUBECONFIG := $(OUTPUT_DIR)/kubeconfig.yaml
-export KUBECONFIG
-
-# create a Kubernetes cluster
-.PHONY: cluster
-cluster:
-	# create a cluster
-	mkdir -p $(OUTPUT_DIR)
-	sed -e "s|OIDC_ISSUER_URL|$(OIDC_ISSUER_URL)|" -e "s|OIDC_CLIENT_ID|$(OIDC_CLIENT_ID)|" cluster.yaml > $(OUTPUT_DIR)/cluster.yaml
-	kind create cluster --name $(CLUSTER_NAME) --config $(OUTPUT_DIR)/cluster.yaml
-	# set up access control
-	kubectl create clusterrole cluster-readonly --verb=get,watch,list --resource='*.*'
-	kubectl create clusterrolebinding cluster-readonly --clusterrole=cluster-readonly --user=$(YOUR_EMAIL)
-	# set up kubectl
-	kubectl config set-credentials oidc \
-		--exec-api-version=client.authentication.k8s.io/v1beta1 \
-		--exec-command=$(CURDIR)/../kubelogin \
-		--exec-arg=get-token \
-		--exec-arg=--token-cache-dir=$(OUTPUT_DIR)/token-cache \
-		--exec-arg=--oidc-issuer-url=$(OIDC_ISSUER_URL) \
-		--exec-arg=--oidc-client-id=$(OIDC_CLIENT_ID) \
-		--exec-arg=--oidc-client-secret=$(OIDC_CLIENT_SECRET) \
-		--exec-arg=--oidc-extra-scope=email
-	# switch the default user
-	kubectl config set-context --current --user=oidc
-
-# clean up the resources
-.PHONY: clean
-clean:
-	-rm -r $(OUTPUT_DIR)
-.PHONY: delete-cluster
-delete-cluster:
-	kind delete cluster --name $(CLUSTER_NAME)
-
-.PHONY: check
-check:
-	docker version
-	kind version
-	kubectl version --client
--- a/acceptance_test/README.md
+++ b/acceptance_test/README.md
@@ -1,75 +0,0 @@
-# kubelogin/acceptance_test
-
-This is a manual test for verifying Kubernetes OIDC authentication with your OIDC provider.
-
-
-## Purpose
-
-This test checks the following points:
-
-1. You can set up your OIDC provider using [setup guide](../docs/setup.md).
-1. The plugin works with your OIDC provider.
-
-
-## Getting Started
-
-### Prerequisite
-
-You need to build the plugin into the parent directory.
-
-```sh
-make -C ..
-```
-
-You need to set up your provider.
-See [setup guide](../docs/setup.md) for more.
-
-You need to install the following tools:
-
- Docker
- Kind
- kubectl
-
-You can check if the tools are available.
-
-```sh
-make check
-```
-
-### 1. Create a cluster
-
-Create a cluster.
-For example, you can create a cluster with Google account authentication.
-
-```sh
-make OIDC_ISSUER_URL=https://accounts.google.com \
-  OIDC_CLIENT_ID=REDACTED.apps.googleusercontent.com \
-  OIDC_CLIENT_SECRET=REDACTED \
-  YOUR_EMAIL=REDACTED@gmail.com
-```
-
-It will do the following steps:
-
-1. Create a cluster.
-1. Set up access control. It allows read-only access from your email address.
-1. Set up kubectl to enable the plugin.
-
-You can change kubectl configuration in generated `output/kubeconfig.yaml`.
-
-### 2. Run kubectl
-
-Make sure you can log in to the provider and access the cluster.
-
-```console
-% export KUBECONFIG=$PWD/output/kubeconfig.yaml
-% kubectl get pods -A
-```
-
-### Clean up
-
-To delete the cluster and generated files:
-
-```sh
-make delete-cluster
-make clean
-```
--- a/acceptance_test/cluster.yaml
+++ b/acceptance_test/cluster.yaml
@@ -1,13 +0,0 @@
-kind: Cluster
-apiVersion: kind.x-k8s.io/v1alpha4
-kubeadmConfigPatches:
-  - |
-    apiVersion: kubeadm.k8s.io/v1beta2
-    kind: ClusterConfiguration
-    metadata:
-      name: config
-    apiServer:
-      extraArgs:
-        oidc-issuer-url: OIDC_ISSUER_URL
-        oidc-client-id: OIDC_CLIENT_ID
-        oidc-username-claim: email
--- a/config.go
+++ b/config.go
@@ -0,0 +1,46 @@
+package main
+
+import (
+	"os"
+
+	"github.com/mitchellh/go-homedir"
+	"k8s.io/client-go/tools/clientcmd"
+	"k8s.io/client-go/tools/clientcmd/api"
+)
+
+// GetCurrentAuthInfo returns the current authInfo
+func GetCurrentAuthInfo(config api.Config) *api.AuthInfo {
+	context := config.Contexts[config.CurrentContext]
+	if context == nil {
+		return nil
+	}
+	authInfo := config.AuthInfos[context.AuthInfo]
+	return authInfo
+}
+
+// ReadKubeConfig returns the current config
+func ReadKubeConfig(path string) (*api.Config, error) {
+	config, err := clientcmd.LoadFromFile(path)
+	if err != nil {
+		return nil, err
+	}
+	return config, nil
+}
+
+// WriteKubeConfig writes the config
+func WriteKubeConfig(config api.Config, path string) error {
+	return clientcmd.WriteToFile(config, path)
+}
+
+// FindKubeConfig returns env:KUBECONFIG or ~/.kube/config
+func FindKubeConfig() (string, error) {
+	env := os.Getenv("KUBECONFIG")
+	if env != "" {
+		return env, nil
+	}
+	path, err := homedir.Expand("~/.kube/config")
+	if err != nil {
+		return "", err
+	}
+	return path, nil
+}
--- a/dist/kubelogin.rb
+++ b/dist/kubelogin.rb
@@ -1,24 +0,0 @@
-class Kubelogin < Formula
-  desc "A kubectl plugin for Kubernetes OpenID Connect authentication"
-  homepage "https://github.com/int128/kubelogin"
-  version "{{ env "VERSION" }}"
-
-  on_macos do
-    url "https://github.com/int128/kubelogin/releases/download/{{ env "VERSION" }}/kubelogin_darwin_amd64.zip"
-    sha256 "{{ sha256 .darwin_amd64_archive }}"
-  end
-  on_linux do
-    url "https://github.com/int128/kubelogin/releases/download/{{ env "VERSION" }}/kubelogin_linux_amd64.zip"
-    sha256 "{{ sha256 .linux_amd64_archive }}"
-  end
-
-  def install
-    bin.install "kubelogin" => "kubelogin"
-    ln_s bin/"kubelogin", bin/"kubectl-oidc_login"
-  end
-
-  test do
-    system "#{bin}/kubelogin -h"
-    system "#{bin}/kubectl-oidc_login -h"
-  end
-end
--- a/docs/credential-plugin-diagram.svg
+++ b/docs/credential-plugin-diagram.svg
--- a/docs/keycloak-login.png
+++ b/docs/keycloak-login.png
--- a/docs/setup.md
+++ b/docs/setup.md
@@ -1,226 +0,0 @@
-# Kubernetes OpenID Connection authentication
-
-This document guides how to set up Kubernetes OpenID Connect (OIDC) authentication.
-Let's see the following steps:
-
-1. Set up the OIDC provider
-1. Verify authentication
-1. Bind a cluster role
-1. Set up the Kubernetes API server
-1. Set up the kubeconfig
-1. Verify cluster access
-
-
-## 1. Set up the OIDC provider
-
-### Google Identity Platform
-
-You can log in with a Google account.
-
-Open [Google APIs Console](https://console.developers.google.com/apis/credentials) and create an OAuth client with the following setting:
-
- Application Type: Other
-
-Check the client ID and secret.
-Replace the following variables in the later sections.
-
-Variable                | Value
------------------------|------
-`ISSUER_URL`            | `https://accounts.google.com`
-`YOUR_CLIENT_ID`        | `xxx.apps.googleusercontent.com`
-`YOUR_CLIENT_SECRET`    | random string
-
-### Keycloak
-
-You can log in with a user of Keycloak.
-Make sure you have an administrator role of the Keycloak realm.
-
-Open Keycloak and create an OIDC client as follows:
-
- Client ID: `YOUR_CLIENT_ID`
- Valid Redirect URLs:
-    - `http://localhost:8000`
-    - `http://localhost:18000` (used if the port 8000 is already in use)
- Issuer URL: `https://keycloak.example.com/auth/realms/YOUR_REALM`
-
-You can associate client roles by adding the following mapper:
-
- Name: `groups`
- Mapper Type: `User Client Role`
- Client ID: `YOUR_CLIENT_ID`
- Client Role prefix: `kubernetes:`
- Token Claim Name: `groups`
- Add to ID token: on
-
-For example, if you have `admin` role of the client, you will get a JWT with the claim `{"groups": ["kubernetes:admin"]}`.
-
-Replace the following variables in the later sections.
-
-Variable                | Value
------------------------|------
-`ISSUER_URL`            | `https://keycloak.example.com/auth/realms/YOUR_REALM`
-`YOUR_CLIENT_ID`        | `YOUR_CLIENT_ID`
-`YOUR_CLIENT_SECRET`    | random string
-
-### Dex with GitHub
-
-You can log in with a GitHub account.
-
-Open [GitHub OAuth Apps](https://github.com/settings/developers) and create an application with the following setting:
-
- Application name: (any)
- Homepage URL: `https://dex.example.com`
- Authorization callback URL: `https://dex.example.com/callback`
-
-Deploy [Dex](https://github.com/dexidp/dex) with the following config:
-
-```yaml
-issuer: https://dex.example.com
-connectors:
- type: github
-  id: github
-  name: GitHub
-  config:
-    clientID: YOUR_GITHUB_CLIENT_ID
-    clientSecret: YOUR_GITHUB_CLIENT_SECRET
-    redirectURI: https://dex.example.com/callback
-staticClients:
- id: YOUR_CLIENT_ID
-  name: Kubernetes
-  redirectURIs:
-  - http://localhost:8000
-  - http://localhost:18000
-  secret: YOUR_DEX_CLIENT_SECRET
-```
-
-Replace the following variables in the later sections.
-
-Variable                | Value
------------------------|------
-`ISSUER_URL`            | `https://dex.example.com`
-`YOUR_CLIENT_ID`        | `YOUR_CLIENT_ID`
-`YOUR_CLIENT_SECRET`    | `YOUR_DEX_CLIENT_SECRET`
-
-### Okta
-
-You can log in with an Okta user.
-Okta supports [the authorization code flow with PKCE](https://developer.okta.com/docs/guides/implement-auth-code-pkce/overview/)
-and this section explains how to set up it.
-
-Open your Okta organization and create an application with the following options:
-
- Application type: Native
- Initiate login URI: `http://localhost:8000`
- Login redirect URIs:
-    - `http://localhost:8000`
-    - `http://localhost:18000` (used if the port 8000 is already in use)
- Allowed grant types: Authorization Code
- Client authentication: Use PKCE (for public clients)
-
-Replace the following variables in the later sections.
-
-Variable                | Value
------------------------|------
-`ISSUER_URL`            | `https://YOUR_ORGANIZATION.okta.com`
-`YOUR_CLIENT_ID`        | random string
-
-You do not need to set `YOUR_CLIENT_SECRET`.
-
-If you need `groups` claim for access control,
-see [jetstack/okta-kubectl-auth](https://github.com/jetstack/okta-kubectl-auth/blob/master/docs/okta-setup.md) and [#250](https://github.com/int128/kubelogin/issues/250).
-
-
-## 2. Verify authentication
-
-Run the following command:
-
-```sh
-kubectl oidc-login setup \
-  --oidc-issuer-url=ISSUER_URL \
-  --oidc-client-id=YOUR_CLIENT_ID \
-  --oidc-client-secret=YOUR_CLIENT_SECRET
-```
-
-It launches the browser and navigates to `http://localhost:8000`.
-Please log in to the provider.
-
-You can set extra options, for example, extra scope or CA certificate.
-See also the full options.
-
-```sh
-kubectl oidc-login setup --help
-```
-
-
-## 3. Bind a cluster role
-
-Here bind `cluster-admin` role to you.
-
-```sh
-kubectl create clusterrolebinding oidc-cluster-admin --clusterrole=cluster-admin --user='ISSUER_URL#YOUR_SUBJECT'
-```
-
-As well as you can create a custom cluster role and bind it.
-
-
-## 4. Set up the Kubernetes API server
-
-Add the following flags to kube-apiserver:
-
-```
--oidc-issuer-url=ISSUER_URL
--oidc-client-id=YOUR_CLIENT_ID
-```
-
-See [Kubernetes Authenticating: OpenID Connect Tokens](https://kubernetes.io/docs/reference/access-authn-authz/authentication/#openid-connect-tokens) for the all flags.
-
-If you are using [kops](https://github.com/kubernetes/kops), run `kops edit cluster` and append the following settings:
-
-```yaml
-spec:
-  kubeAPIServer:
-    oidcIssuerURL: ISSUER_URL
-    oidcClientID: YOUR_CLIENT_ID
-```
-
-If you are using [kube-aws](https://github.com/kubernetes-incubator/kube-aws), append the following settings to the `cluster.yaml`:
-
-```yaml
-       oidc:
-         enabled: true
-         issuerUrl: ISSUER_URL
-         clientId: YOUR_CLIENT_ID
-```
-
-
-## 5. Set up the kubeconfig
-
-Add `oidc` user to the kubeconfig.
-
-```sh
-kubectl config set-credentials oidc \
-  --exec-api-version=client.authentication.k8s.io/v1beta1 \
-  --exec-command=kubectl \
-  --exec-arg=oidc-login \
-  --exec-arg=get-token \
-  --exec-arg=--oidc-issuer-url=ISSUER_URL \
-  --exec-arg=--oidc-client-id=YOUR_CLIENT_ID \
-  --exec-arg=--oidc-client-secret=YOUR_CLIENT_SECRET
-```
-
-
-## 6. Verify cluster access
-
-Make sure you can access the Kubernetes cluster.
-
-```sh
-kubectl --user=oidc cluster-info
-```
-
-You can switch the current context to oidc.
-
-```sh
-kubectl config set-context --current --user=oidc
-```
-
-You can share the kubeconfig to your team members for on-boarding.
--- a/docs/standalone-mode.md
+++ b/docs/standalone-mode.md
@@ -1,129 +0,0 @@
-# Standalone mode
-
-You can run kubelogin as a standalone command.
-In this mode, you need to manually run the command before running kubectl.
-
-Configure the kubeconfig like:
-
-```yaml
- name: keycloak
-  user:
-    auth-provider:
-      config:
-        client-id: YOUR_CLIENT_ID
-        client-secret: YOUR_CLIENT_SECRET
-        idp-issuer-url: https://issuer.example.com
-      name: oidc
-```
-
-Run kubelogin:
-
-```sh
-kubelogin
-
-# or run as a kubectl plugin
-kubectl oidc-login
-```
-
-It automatically opens the browser and you can log in to the provider.
-
-<img src="keycloak-login.png" alt="keycloak-login" width="455" height="329">
-
-After authentication, kubelogin writes the ID token and refresh token to the kubeconfig.
-
-```
-% kubelogin
-Open http://localhost:8000 for authentication
-You got a valid token until 2019-05-18 10:28:51 +0900 JST
-Updated ~/.kubeconfig
-```
-
-Now you can access the cluster.
-
-```
-% kubectl get pods
-NAME                          READY   STATUS    RESTARTS   AGE
-echoserver-86c78fdccd-nzmd5   1/1     Running   0          26d
-```
-
-Your kubeconfig looks like:
-
-```yaml
-users:
- name: keycloak
-  user:
-    auth-provider:
-      config:
-        client-id: YOUR_CLIENT_ID
-        client-secret: YOUR_CLIENT_SECRET
-        idp-issuer-url: https://issuer.example.com
-        id-token: ey...       # kubelogin will add or update the ID token here
-        refresh-token: ey...  # kubelogin will add or update the refresh token here
-      name: oidc
-```
-
-If the ID token is valid, kubelogin does nothing.
-
-```
-% kubelogin
-You already have a valid token until 2019-05-18 10:28:51 +0900 JST
-```
-
-If the ID token has expired, kubelogin will refresh the token using the refresh token in the kubeconfig.
-If the refresh token has expired, kubelogin will proceed the authentication.
-
-
-## Usage
-
-### Kubeconfig
-
-You can set path to the kubeconfig file by the option or the environment variable just like kubectl.
-It defaults to `~/.kube/config`.
-
-```sh
-# by the option
-kubelogin --kubeconfig /path/to/kubeconfig
-
-# by the environment variable
-KUBECONFIG="/path/to/kubeconfig1:/path/to/kubeconfig2" kubelogin
-```
-
-If you set multiple files, kubelogin will find the file which has the current authentication (i.e. `user` and `auth-provider`) and write a token to it.
-
-Kubelogin supports the following keys of `auth-provider` in a kubeconfig.
-See [kubectl authentication](https://kubernetes.io/docs/reference/access-authn-authz/authentication/#using-kubectl) for more.
-
-Key | Direction | Value
----|-----------|------
-`idp-issuer-url`                  | Read (Mandatory) | Issuer URL of the provider.
-`client-id`                       | Read (Mandatory) | Client ID of the provider.
-`client-secret`                   | Read (Mandatory) | Client Secret of the provider.
-`idp-certificate-authority`       | Read | CA certificate path of the provider.
-`idp-certificate-authority-data`  | Read | Base64 encoded CA certificate of the provider.
-`extra-scopes`                    | Read | Scopes to request to the provider (comma separated).
-`id-token`                        | Write | ID token got from the provider.
-`refresh-token`                   | Write | Refresh token got from the provider.
-
-### Extra scopes
-
-You can set the extra scopes to request to the provider by `extra-scopes` in the kubeconfig.
-
-```sh
-kubectl config set-credentials keycloak --auth-provider-arg extra-scopes=email
-```
-
-Currently kubectl does not accept multiple scopes, so you need to edit the kubeconfig as like:
-
-```sh
-kubectl config set-credentials keycloak --auth-provider-arg extra-scopes=SCOPES
-sed -i '' -e s/SCOPES/email,profile/ $KUBECONFIG
-```
-
-### CA Certificates
-
-You can use your self-signed certificates for the provider.
-
-```sh
-kubectl config set-credentials keycloak \
-  --auth-provider-arg idp-certificate-authority=$HOME/.kube/keycloak-ca.pem
-```
--- a/docs/system-test-diagram.svg
+++ b/docs/system-test-diagram.svg
--- a/docs/usage.md
+++ b/docs/usage.md
@@ -1,250 +0,0 @@
-# Usage
-
-Kubelogin supports the following options:
-
-```
-Usage:
-  kubelogin get-token [flags]
-
-Flags:
-      --oidc-issuer-url string                          Issuer URL of the provider (mandatory)
-      --oidc-client-id string                           Client ID of the provider (mandatory)
-      --oidc-client-secret string                       Client secret of the provider
-      --oidc-extra-scope strings                        Scopes to request to the provider
-      --token-cache-dir string                          Path to a directory for token cache (default "~/.kube/cache/oidc-login")
-      --certificate-authority stringArray               Path to a cert file for the certificate authority
-      --certificate-authority-data stringArray          Base64 encoded cert for the certificate authority
-      --insecure-skip-tls-verify                        If set, the server's certificate will not be checked for validity. This will make your HTTPS connections insecure
-      --tls-renegotiation-once                          If set, allow a remote server to request renegotiation once per connection
-      --tls-renegotiation-freely                        If set, allow a remote server to repeatedly request renegotiation
-      --grant-type string                               Authorization grant type to use. One of (auto|authcode|authcode-keyboard|password) (default "auto")
-      --listen-address strings                          [authcode] Address to bind to the local server. If multiple addresses are set, it will try binding in order (default [127.0.0.1:8000,127.0.0.1:18000])
-      --skip-open-browser                               [authcode] Do not open the browser automatically
-      --authentication-timeout-sec int                  [authcode] Timeout of authentication in seconds (default 180)
-      --local-server-cert string                        [authcode] Certificate path for the local server
-      --local-server-key string                         [authcode] Certificate key path for the local server
-      --open-url-after-authentication string            [authcode] If set, open the URL in the browser after authentication
-      --oidc-redirect-url-hostname string               [authcode] Hostname of the redirect URL (default "localhost")
-      --oidc-auth-request-extra-params stringToString   [authcode, authcode-keyboard] Extra query parameters to send with an authentication request (default [])
-      --username string                                 [password] Username for resource owner password credentials grant
-      --password string                                 [password] Password for resource owner password credentials grant
-  -h, --help                                            help for get-token
-
-Global Flags:
-      --add_dir_header                   If true, adds the file directory to the header of the log messages
-      --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)
-      --one_output                       If true, only write logs to their native severity level (vs also writing to each lower severity level)
-      --skip_headers                     If true, avoid header prefixes in the log messages
-      --skip_log_headers                 If true, avoid headers when opening log files
-      --stderrthreshold severity         logs at or above this threshold go to stderr (default 2)
-  -v, --v Level                          number for the log level verbosity
-      --vmodule moduleSpec               comma-separated list of pattern=N settings for file-filtered logging
-```
-
-
-## Options
-
-### Authentication timeout
-
-By default, you need to log in to your provider in the browser within 3 minutes.
-This prevents a process from remaining forever.
-You can change the timeout by the following flag:
-
-```yaml
-      - --authentication-timeout-sec=60
-```
-
-For now this timeout works only for the authorization code flow.
-
-### Extra scopes
-
-You can set the extra scopes to request to the provider by `--oidc-extra-scope`.
-
-```yaml
-      - --oidc-extra-scope=email
-      - --oidc-extra-scope=profile
-```
-
-### CA certificate
-
-You can use your self-signed certificate for the provider.
-
-```yaml
-      - --certificate-authority=/home/user/.kube/keycloak-ca.pem
-      - --certificate-authority-data=LS0t...
-```
-
-### HTTP proxy
-
-You can set the following environment variables if you are behind a proxy: `HTTP_PROXY`, `HTTPS_PROXY` and `NO_PROXY`.
-See also [net/http#ProxyFromEnvironment](https://golang.org/pkg/net/http/#ProxyFromEnvironment).
-
-### Home directory expansion
-
-If a value in the following options begins with a tilde character `~`, it is expanded to the home directory.
-
- `--certificate-authority`
- `--local-server-cert`
- `--local-server-key`
- `--token-cache-dir`
-
-
-## Authentication flows
-
-Kubelogin support the following flows:
-
- Authorization code flow
- Authorization code flow with a keyboard
- Resource owner password credentials grant flow
-
-### Authorization code flow
-
-Kubelogin performs the authorization code flow by default.
-
-It starts the local server at port 8000 or 18000 by default.
-You need to register the following redirect URIs to the provider:
-
- `http://localhost:8000`
- `http://localhost:18000` (used if port 8000 is already in use)
-
-You can change the listening address.
-
-```yaml
-      - --listen-address=127.0.0.1:12345
-      - --listen-address=127.0.0.1:23456
-```
-
-You can specify a certificate for the local webserver if HTTPS is required by your identity provider.
-
-```yaml
-      - --local-server-cert=localhost.crt
-      - --local-server-key=localhost.key
-```
-
-You can change the hostname of redirect URI from the default value `localhost`.
-
-```yaml
-      - --oidc-redirect-url-hostname=127.0.0.1
-```
-
-You can add extra parameters to the authentication request.
-
-```yaml
-      - --oidc-auth-request-extra-params=ttl=86400
-```
-
-When authentication completed, kubelogin shows a message to close the browser.
-You can change the URL to show after authentication.
-
-```yaml
-      - --open-url-after-authentication=https://example.com/success.html
-```
-
-You can skip opening the browser if you encounter some environment problem.
-
-```yaml
-      - --skip-open-browser
-```
-
-For Linux users, you change the default browser by `BROWSER` environment variable.
-
-### Authorization code flow with a keyboard
-
-If you cannot access the browser, instead use the authorization code flow with a keyboard.
-
-```yaml
-      - --grant-type=authcode-keyboard
-```
-
-Kubelogin will show the URL and prompt.
-Open the URL in the browser and then copy the code shown.
-
-```
-% kubectl get pods
-Open https://accounts.google.com/o/oauth2/v2/auth?access_type=offline&client_id=...
-Enter code: YOUR_CODE
-```
-
-Note that this flow uses the redirect URI `urn:ietf:wg:oauth:2.0:oob` and some OIDC providers do not support it.
-
-You can add extra parameters to the authentication request.
-
-```yaml
-      - --oidc-auth-request-extra-params=ttl=86400
-```
-
-### Resource owner password credentials grant flow
-
-Kubelogin performs the resource owner password credentials grant flow
-when `--grant-type=password` or `--username` is set.
-
-Note that most OIDC providers do not support this flow.
-Keycloak supports this flow but you need to explicitly enable the "Direct Access Grants" feature in the client settings.
-
-You can set the username and password.
-
-```yaml
-      - --username=USERNAME
-      - --password=PASSWORD
-```
-
-If the password is not set, kubelogin will show the prompt for the password.
-
-```yaml
-      - --username=USERNAME
-```
-
-```
-% kubectl get pods
-Password:
-```
-
-If the username is not set, kubelogin will show the prompt for the username and password.
-
-```yaml
-      - --grant-type=password
-```
-
-```
-% kubectl get pods
-Username: foo
-Password:
-```
-
-## Run in Docker
-
-You can run [the Docker image](https://ghcr.io/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
-      - ghcr.io/int128/kubelogin
-      - get-token
-      - --token-cache-dir=/.token-cache
-      - --listen-address=0.0.0.0:8000
-      - --oidc-issuer-url=ISSUER_URL
-      - --oidc-client-id=YOUR_CLIENT_ID
-      - --oidc-client-secret=YOUR_CLIENT_SECRET
-```
-
-Known limitations:
-
- It cannot open the browser automatically.
- The container port and listen port must be equal for consistency of the redirect URI.
--- a/go.mod
+++ b/go.mod
@@ -1,26 +0,0 @@
-module github.com/int128/kubelogin
-
-go 1.16
-
-require (
-	github.com/alexflint/go-filemutex v1.1.0
-	github.com/chromedp/chromedp v0.6.9
-	github.com/coreos/go-oidc/v3 v3.0.0
-	github.com/dgrijalva/jwt-go v3.2.0+incompatible
-	github.com/golang/mock v1.5.0
-	github.com/google/go-cmp v0.5.5
-	github.com/google/wire v0.5.0
-	github.com/int128/oauth2cli v1.13.0
-	github.com/pkg/browser v0.0.0-20210115035449-ce105d075bb4
-	github.com/spf13/cobra v1.1.3
-	github.com/spf13/pflag v1.0.5
-	golang.org/x/crypto v0.0.0-20201221181555-eec23a3978ad // indirect
-	golang.org/x/net v0.0.0-20210316092652-d523dce5a7f4
-	golang.org/x/oauth2 v0.0.0-20210313182246-cd4f82c27b84
-	golang.org/x/sync v0.0.0-20210220032951-036812b2e83c
-	golang.org/x/term v0.0.0-20210317153231-de623e64d2a6
-	gopkg.in/yaml.v2 v2.4.0
-	k8s.io/apimachinery v0.20.5
-	k8s.io/client-go v0.20.5
-	k8s.io/klog/v2 v2.8.0
-)
--- a/go.sum
+++ b/go.sum
@@ -1,680 +0,0 @@
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--- a/integration_test/credetial_plugin_test.go
+++ b/integration_test/credetial_plugin_test.go
@@ -1,443 +0,0 @@
-package integration_test
-
-import (
-	"bytes"
-	"context"
-	"encoding/json"
-	"io"
-	"os"
-	"testing"
-	"time"
-
-	"github.com/google/go-cmp/cmp"
-	"github.com/int128/kubelogin/integration_test/httpdriver"
-	"github.com/int128/kubelogin/integration_test/keypair"
-	"github.com/int128/kubelogin/integration_test/oidcserver"
-	"github.com/int128/kubelogin/pkg/di"
-	"github.com/int128/kubelogin/pkg/infrastructure/browser"
-	"github.com/int128/kubelogin/pkg/testing/clock"
-	"github.com/int128/kubelogin/pkg/testing/logger"
-	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
-	clientauthenticationv1beta1 "k8s.io/client-go/pkg/apis/clientauthentication/v1beta1"
-)
-
-// Run the integration tests of the credential plugin use-case.
-//
-// 1. Start the auth server.
-// 2. Run the Cmd.
-// 3. Open a request for the local server.
-// 4. Verify the output.
-//
-func TestCredentialPlugin(t *testing.T) {
-	timeout := 10 * time.Second
-	now := time.Date(2020, 1, 1, 0, 0, 0, 0, time.UTC)
-	tokenCacheDir := t.TempDir()
-
-	for name, tc := range map[string]struct {
-		keyPair keypair.KeyPair
-		args    []string
-	}{
-		"NoTLS": {},
-		"TLS": {
-			keyPair: keypair.Server,
-			args:    []string{"--certificate-authority", keypair.Server.CACertPath},
-		},
-	} {
-		httpDriverOption := httpdriver.Option{
-			TLSConfig:    tc.keyPair.TLSConfig,
-			BodyContains: "Authenticated",
-		}
-
-		t.Run(name, func(t *testing.T) {
-			t.Run("AuthCode", func(t *testing.T) {
-				t.Parallel()
-				ctx, cancel := context.WithTimeout(context.TODO(), timeout)
-				defer cancel()
-				sv := oidcserver.New(t, tc.keyPair, oidcserver.Config{
-					Want: oidcserver.Want{
-						Scope:             "openid",
-						RedirectURIPrefix: "http://localhost:",
-					},
-					Response: oidcserver.Response{
-						IDTokenExpiry: now.Add(time.Hour),
-					},
-				})
-				defer sv.Shutdown(t, ctx)
-				var stdout bytes.Buffer
-				runGetToken(t, ctx, getTokenConfig{
-					tokenCacheDir: tokenCacheDir,
-					issuerURL:     sv.IssuerURL(),
-					httpDriver:    httpdriver.New(ctx, t, httpDriverOption),
-					now:           now,
-					stdout:        &stdout,
-					args:          tc.args,
-				})
-				assertCredentialPluginStdout(t, &stdout, sv.LastTokenResponse().IDToken, now.Add(time.Hour))
-			})
-
-			t.Run("ROPC", func(t *testing.T) {
-				t.Parallel()
-				ctx, cancel := context.WithTimeout(context.TODO(), timeout)
-				defer cancel()
-				sv := oidcserver.New(t, tc.keyPair, oidcserver.Config{
-					Want: oidcserver.Want{
-						Scope:             "openid",
-						RedirectURIPrefix: "http://localhost:",
-						Username:          "USER1",
-						Password:          "PASS1",
-					},
-					Response: oidcserver.Response{
-						IDTokenExpiry: now.Add(time.Hour),
-					},
-				})
-				defer sv.Shutdown(t, ctx)
-				var stdout bytes.Buffer
-				runGetToken(t, ctx, getTokenConfig{
-					tokenCacheDir: tokenCacheDir,
-					issuerURL:     sv.IssuerURL(),
-					httpDriver:    httpdriver.Zero(t),
-					now:           now,
-					stdout:        &stdout,
-					args: append([]string{
-						"--username", "USER1",
-						"--password", "PASS1",
-					}, tc.args...),
-				})
-				assertCredentialPluginStdout(t, &stdout, sv.LastTokenResponse().IDToken, now.Add(time.Hour))
-			})
-
-			t.Run("TokenCacheLifecycle", func(t *testing.T) {
-				t.Parallel()
-				ctx, cancel := context.WithTimeout(context.TODO(), timeout)
-				defer cancel()
-				sv := oidcserver.New(t, tc.keyPair, oidcserver.Config{})
-				defer sv.Shutdown(t, ctx)
-
-				t.Run("NoCache", func(t *testing.T) {
-					sv.SetConfig(oidcserver.Config{
-						Want: oidcserver.Want{
-							Scope:             "openid",
-							RedirectURIPrefix: "http://localhost:",
-						},
-						Response: oidcserver.Response{
-							IDTokenExpiry: now.Add(time.Hour),
-							RefreshToken:  "REFRESH_TOKEN_1",
-						},
-					})
-					var stdout bytes.Buffer
-					runGetToken(t, ctx, getTokenConfig{
-						tokenCacheDir: tokenCacheDir,
-						issuerURL:     sv.IssuerURL(),
-						httpDriver:    httpdriver.New(ctx, t, httpDriverOption),
-						now:           now,
-						stdout:        &stdout,
-						args:          tc.args,
-					})
-					assertCredentialPluginStdout(t, &stdout, sv.LastTokenResponse().IDToken, now.Add(time.Hour))
-				})
-				t.Run("Valid", func(t *testing.T) {
-					sv.SetConfig(oidcserver.Config{})
-					var stdout bytes.Buffer
-					runGetToken(t, ctx, getTokenConfig{
-						tokenCacheDir: tokenCacheDir,
-						issuerURL:     sv.IssuerURL(),
-						httpDriver:    httpdriver.Zero(t),
-						now:           now,
-						stdout:        &stdout,
-						args:          tc.args,
-					})
-					assertCredentialPluginStdout(t, &stdout, sv.LastTokenResponse().IDToken, now.Add(time.Hour))
-				})
-				t.Run("Refresh", func(t *testing.T) {
-					sv.SetConfig(oidcserver.Config{
-						Want: oidcserver.Want{
-							Scope:             "openid",
-							RedirectURIPrefix: "http://localhost:",
-							RefreshToken:      "REFRESH_TOKEN_1",
-						},
-						Response: oidcserver.Response{
-							IDTokenExpiry: now.Add(3 * time.Hour),
-							RefreshToken:  "REFRESH_TOKEN_2",
-						},
-					})
-					var stdout bytes.Buffer
-					runGetToken(t, ctx, getTokenConfig{
-						tokenCacheDir: tokenCacheDir,
-						issuerURL:     sv.IssuerURL(),
-						httpDriver:    httpdriver.New(ctx, t, httpDriverOption),
-						now:           now.Add(2 * time.Hour),
-						stdout:        &stdout,
-						args:          tc.args,
-					})
-					assertCredentialPluginStdout(t, &stdout, sv.LastTokenResponse().IDToken, now.Add(3*time.Hour))
-				})
-				t.Run("RefreshAgain", func(t *testing.T) {
-					sv.SetConfig(oidcserver.Config{
-						Want: oidcserver.Want{
-							Scope:             "openid",
-							RedirectURIPrefix: "http://localhost:",
-							RefreshToken:      "REFRESH_TOKEN_2",
-						},
-						Response: oidcserver.Response{
-							IDTokenExpiry: now.Add(5 * time.Hour),
-						},
-					})
-					var stdout bytes.Buffer
-					runGetToken(t, ctx, getTokenConfig{
-						tokenCacheDir: tokenCacheDir,
-						issuerURL:     sv.IssuerURL(),
-						httpDriver:    httpdriver.New(ctx, t, httpDriverOption),
-						now:           now.Add(4 * time.Hour),
-						stdout:        &stdout,
-						args:          tc.args,
-					})
-					assertCredentialPluginStdout(t, &stdout, sv.LastTokenResponse().IDToken, now.Add(5*time.Hour))
-				})
-			})
-		})
-	}
-
-	t.Run("PKCE", func(t *testing.T) {
-		t.Parallel()
-		ctx, cancel := context.WithTimeout(context.TODO(), timeout)
-		defer cancel()
-		sv := oidcserver.New(t, keypair.None, oidcserver.Config{
-			Want: oidcserver.Want{
-				Scope:               "openid",
-				RedirectURIPrefix:   "http://localhost:",
-				CodeChallengeMethod: "S256",
-			},
-			Response: oidcserver.Response{
-				IDTokenExpiry:                 now.Add(time.Hour),
-				CodeChallengeMethodsSupported: []string{"plain", "S256"},
-			},
-		})
-		defer sv.Shutdown(t, ctx)
-		var stdout bytes.Buffer
-		runGetToken(t, ctx, getTokenConfig{
-			tokenCacheDir: tokenCacheDir,
-			issuerURL:     sv.IssuerURL(),
-			httpDriver:    httpdriver.New(ctx, t, httpdriver.Option{BodyContains: "Authenticated"}),
-			now:           now,
-			stdout:        &stdout,
-		})
-		assertCredentialPluginStdout(t, &stdout, sv.LastTokenResponse().IDToken, now.Add(time.Hour))
-	})
-
-	t.Run("TLSData", func(t *testing.T) {
-		t.Parallel()
-		ctx, cancel := context.WithTimeout(context.TODO(), timeout)
-		defer cancel()
-		sv := oidcserver.New(t, keypair.Server, oidcserver.Config{
-			Want: oidcserver.Want{
-				Scope:             "openid",
-				RedirectURIPrefix: "http://localhost:",
-			},
-			Response: oidcserver.Response{
-				IDTokenExpiry: now.Add(time.Hour),
-			},
-		})
-		defer sv.Shutdown(t, ctx)
-		var stdout bytes.Buffer
-		runGetToken(t, ctx, getTokenConfig{
-			tokenCacheDir: tokenCacheDir,
-			issuerURL:     sv.IssuerURL(),
-			httpDriver:    httpdriver.New(ctx, t, httpdriver.Option{TLSConfig: keypair.Server.TLSConfig, BodyContains: "Authenticated"}),
-			now:           now,
-			stdout:        &stdout,
-			args:          []string{"--certificate-authority-data", keypair.Server.CACertBase64},
-		})
-		assertCredentialPluginStdout(t, &stdout, sv.LastTokenResponse().IDToken, now.Add(time.Hour))
-	})
-
-	t.Run("ExtraScopes", func(t *testing.T) {
-		t.Parallel()
-		ctx, cancel := context.WithTimeout(context.TODO(), timeout)
-		defer cancel()
-		sv := oidcserver.New(t, keypair.None, oidcserver.Config{
-			Want: oidcserver.Want{
-				Scope:             "email profile openid",
-				RedirectURIPrefix: "http://localhost:",
-			},
-			Response: oidcserver.Response{
-				IDTokenExpiry: now.Add(time.Hour),
-			},
-		})
-		defer sv.Shutdown(t, ctx)
-		var stdout bytes.Buffer
-		runGetToken(t, ctx, getTokenConfig{
-			tokenCacheDir: tokenCacheDir,
-			issuerURL:     sv.IssuerURL(),
-			httpDriver:    httpdriver.New(ctx, t, httpdriver.Option{BodyContains: "Authenticated"}),
-			now:           now,
-			stdout:        &stdout,
-			args: []string{
-				"--oidc-extra-scope", "email",
-				"--oidc-extra-scope", "profile",
-			},
-		})
-		assertCredentialPluginStdout(t, &stdout, sv.LastTokenResponse().IDToken, now.Add(time.Hour))
-	})
-
-	t.Run("OpenURLAfterAuthentication", func(t *testing.T) {
-		t.Parallel()
-		ctx, cancel := context.WithTimeout(context.TODO(), timeout)
-		defer cancel()
-		sv := oidcserver.New(t, keypair.None, oidcserver.Config{
-			Want: oidcserver.Want{
-				Scope:             "openid",
-				RedirectURIPrefix: "http://localhost:",
-			},
-			Response: oidcserver.Response{
-				IDTokenExpiry: now.Add(time.Hour),
-			},
-		})
-		defer sv.Shutdown(t, ctx)
-		var stdout bytes.Buffer
-		runGetToken(t, ctx, getTokenConfig{
-			tokenCacheDir: tokenCacheDir,
-			issuerURL:     sv.IssuerURL(),
-			httpDriver:    httpdriver.New(ctx, t, httpdriver.Option{BodyContains: "URL=https://example.com/success"}),
-			now:           now,
-			stdout:        &stdout,
-			args:          []string{"--open-url-after-authentication", "https://example.com/success"},
-		})
-		assertCredentialPluginStdout(t, &stdout, sv.LastTokenResponse().IDToken, now.Add(time.Hour))
-	})
-
-	t.Run("RedirectURLHostname", func(t *testing.T) {
-		t.Parallel()
-		ctx, cancel := context.WithTimeout(context.TODO(), timeout)
-		defer cancel()
-		sv := oidcserver.New(t, keypair.None, oidcserver.Config{
-			Want: oidcserver.Want{
-				Scope:             "openid",
-				RedirectURIPrefix: "http://127.0.0.1:",
-			},
-			Response: oidcserver.Response{
-				IDTokenExpiry: now.Add(time.Hour),
-			},
-		})
-		defer sv.Shutdown(t, ctx)
-		var stdout bytes.Buffer
-		runGetToken(t, ctx, getTokenConfig{
-			tokenCacheDir: tokenCacheDir,
-			issuerURL:     sv.IssuerURL(),
-			httpDriver:    httpdriver.New(ctx, t, httpdriver.Option{BodyContains: "Authenticated"}),
-			now:           now,
-			stdout:        &stdout,
-			args:          []string{"--oidc-redirect-url-hostname", "127.0.0.1"},
-		})
-		assertCredentialPluginStdout(t, &stdout, sv.LastTokenResponse().IDToken, now.Add(time.Hour))
-	})
-
-	t.Run("RedirectURLHTTPS", func(t *testing.T) {
-		t.Parallel()
-		ctx, cancel := context.WithTimeout(context.TODO(), timeout)
-		defer cancel()
-		sv := oidcserver.New(t, keypair.None, oidcserver.Config{
-			Want: oidcserver.Want{
-				Scope:             "openid",
-				RedirectURIPrefix: "https://localhost:",
-			},
-			Response: oidcserver.Response{
-				IDTokenExpiry: now.Add(time.Hour),
-			},
-		})
-		defer sv.Shutdown(t, ctx)
-		var stdout bytes.Buffer
-		runGetToken(t, ctx, getTokenConfig{
-			tokenCacheDir: tokenCacheDir,
-			issuerURL:     sv.IssuerURL(),
-			httpDriver: httpdriver.New(ctx, t, httpdriver.Option{
-				TLSConfig:    keypair.Server.TLSConfig,
-				BodyContains: "Authenticated",
-			}),
-			now:    now,
-			stdout: &stdout,
-			args: []string{
-				"--local-server-cert", keypair.Server.CertPath,
-				"--local-server-key", keypair.Server.KeyPath,
-			},
-		})
-		assertCredentialPluginStdout(t, &stdout, sv.LastTokenResponse().IDToken, now.Add(time.Hour))
-	})
-
-	t.Run("ExtraParams", func(t *testing.T) {
-		t.Parallel()
-		ctx, cancel := context.WithTimeout(context.TODO(), timeout)
-		defer cancel()
-		sv := oidcserver.New(t, keypair.None, oidcserver.Config{
-			Want: oidcserver.Want{
-				Scope:             "openid",
-				RedirectURIPrefix: "http://localhost:",
-				ExtraParams: map[string]string{
-					"ttl":    "86400",
-					"reauth": "false",
-				},
-			},
-			Response: oidcserver.Response{
-				IDTokenExpiry: now.Add(time.Hour),
-			},
-		})
-		defer sv.Shutdown(t, ctx)
-		var stdout bytes.Buffer
-		runGetToken(t, ctx, getTokenConfig{
-			tokenCacheDir: tokenCacheDir,
-			issuerURL:     sv.IssuerURL(),
-			httpDriver:    httpdriver.New(ctx, t, httpdriver.Option{BodyContains: "Authenticated"}),
-			now:           now,
-			stdout:        &stdout,
-			args: []string{
-				"--oidc-auth-request-extra-params", "ttl=86400",
-				"--oidc-auth-request-extra-params", "reauth=false",
-			},
-		})
-		assertCredentialPluginStdout(t, &stdout, sv.LastTokenResponse().IDToken, now.Add(time.Hour))
-	})
-}
-
-type getTokenConfig struct {
-	tokenCacheDir string
-	issuerURL     string
-	httpDriver    browser.Interface
-	stdout        io.Writer
-	now           time.Time
-	args          []string
-}
-
-func runGetToken(t *testing.T, ctx context.Context, cfg getTokenConfig) {
-	cmd := di.NewCmdForHeadless(clock.Fake(cfg.now), os.Stdin, cfg.stdout, logger.New(t), cfg.httpDriver)
-	exitCode := cmd.Run(ctx, append([]string{
-		"kubelogin",
-		"get-token",
-		"--token-cache-dir", cfg.tokenCacheDir,
-		"--oidc-issuer-url", cfg.issuerURL,
-		"--oidc-client-id", "kubernetes",
-		"--listen-address", "127.0.0.1:0",
-	}, cfg.args...), "latest")
-	if exitCode != 0 {
-		t.Errorf("exit status wants 0 but %d", exitCode)
-	}
-}
-
-func assertCredentialPluginStdout(t *testing.T, stdout io.Reader, token string, expiry time.Time) {
-	var got clientauthenticationv1beta1.ExecCredential
-	if err := json.NewDecoder(stdout).Decode(&got); err != nil {
-		t.Errorf("could not decode json of the credential plugin: %s", err)
-		return
-	}
-	want := clientauthenticationv1beta1.ExecCredential{
-		TypeMeta: metav1.TypeMeta{
-			APIVersion: "client.authentication.k8s.io/v1beta1",
-			Kind:       "ExecCredential",
-		},
-		Status: &clientauthenticationv1beta1.ExecCredentialStatus{
-			Token:               token,
-			ExpirationTimestamp: &metav1.Time{Time: expiry},
-		},
-	}
-	if diff := cmp.Diff(want, got); diff != "" {
-		t.Errorf("kubeconfig mismatch (-want +got):\n%s", diff)
-	}
-}
--- a/integration_test/httpdriver/http_driver.go
+++ b/integration_test/httpdriver/http_driver.go
@@ -1,70 +0,0 @@
-// Package httpdriver provides a test double of the browser.
-package httpdriver
-
-import (
-	"context"
-	"crypto/tls"
-	"io/ioutil"
-	"net/http"
-	"strings"
-	"testing"
-)
-
-type Option struct {
-	TLSConfig    *tls.Config
-	BodyContains string
-}
-
-// New returns a client to simulate browser access.
-func New(ctx context.Context, t *testing.T, o Option) *client {
-	return &client{ctx, t, o}
-}
-
-// Zero returns a client which call is not expected.
-func Zero(t *testing.T) *zeroClient {
-	return &zeroClient{t}
-}
-
-type client struct {
-	ctx context.Context
-	t   *testing.T
-	o   Option
-}
-
-func (c *client) Open(url string) error {
-	client := http.Client{Transport: &http.Transport{TLSClientConfig: c.o.TLSConfig}}
-	req, err := http.NewRequest("GET", url, nil)
-	if err != nil {
-		c.t.Errorf("could not create a request: %s", err)
-		return nil
-	}
-	req = req.WithContext(c.ctx)
-	resp, err := client.Do(req)
-	if err != nil {
-		c.t.Errorf("could not send a request: %s", err)
-		return nil
-	}
-	defer resp.Body.Close()
-	if resp.StatusCode != 200 {
-		c.t.Errorf("StatusCode wants 200 but %d", resp.StatusCode)
-	}
-	b, err := ioutil.ReadAll(resp.Body)
-	if err != nil {
-		c.t.Errorf("could not read body: %s", err)
-		return nil
-	}
-	body := string(b)
-	if !strings.Contains(body, c.o.BodyContains) {
-		c.t.Errorf("body should contain %s but was %s", c.o.BodyContains, body)
-	}
-	return nil
-}
-
-type zeroClient struct {
-	t *testing.T
-}
-
-func (c *zeroClient) Open(url string) error {
-	c.t.Errorf("unexpected function call Open(%s)", url)
-	return nil
-}
--- a/integration_test/keypair/keypair.go
+++ b/integration_test/keypair/keypair.go
@@ -1,62 +0,0 @@
-package keypair
-
-import (
-	"crypto/tls"
-	"crypto/x509"
-	"encoding/base64"
-	"io"
-	"io/ioutil"
-	"os"
-	"strings"
-)
-
-// KeyPair represents a pair of certificate and key.
-type KeyPair struct {
-	CertPath     string
-	KeyPath      string
-	CACertPath   string
-	CACertBase64 string
-	TLSConfig    *tls.Config
-}
-
-// None represents non-TLS.
-var None KeyPair
-
-// Server is a KeyPair for TLS server.
-// These files should be generated by Makefile before test.
-var Server = KeyPair{
-	CertPath:     "keypair/testdata/server.crt",
-	KeyPath:      "keypair/testdata/server.key",
-	CACertPath:   "keypair/testdata/ca.crt",
-	CACertBase64: readAsBase64("keypair/testdata/ca.crt"),
-	TLSConfig:    newTLSConfig("keypair/testdata/ca.crt"),
-}
-
-func readAsBase64(name string) string {
-	f, err := os.Open(name)
-	if err != nil {
-		panic(err)
-	}
-	defer f.Close()
-	var s strings.Builder
-	e := base64.NewEncoder(base64.StdEncoding, &s)
-	if _, err := io.Copy(e, f); err != nil {
-		panic(err)
-	}
-	if err := e.Close(); err != nil {
-		panic(err)
-	}
-	return s.String()
-}
-
-func newTLSConfig(name string) *tls.Config {
-	b, err := ioutil.ReadFile(name)
-	if err != nil {
-		panic(err)
-	}
-	p := x509.NewCertPool()
-	if !p.AppendCertsFromPEM(b) {
-		panic("could not append the CA cert")
-	}
-	return &tls.Config{RootCAs: p}
-}
--- a/integration_test/keypair/testdata/Makefile
+++ b/integration_test/keypair/testdata/Makefile
@@ -1,26 +0,0 @@
-EXPIRY := 3650
-OUTPUT_DIR := testdata
-TARGETS := ca.key
-TARGETS += ca.crt
-TARGETS += server.key
-TARGETS += server.crt
-
-.PHONY: all
-all: $(TARGETS)
-
-ca.key:
-	openssl genrsa -out $@ 2048
-ca.csr: ca.key
-	openssl req -new -key ca.key -out $@ -subj "/CN=hello-ca" -config openssl.cnf
-ca.crt: ca.key ca.csr
-	openssl x509 -req -in ca.csr -signkey ca.key -out $@ -days $(EXPIRY)
-server.key:
-	openssl genrsa -out $@ 2048
-server.csr: openssl.cnf server.key
-	openssl req -new -key server.key -out $@ -subj "/CN=localhost" -config openssl.cnf
-server.crt: openssl.cnf server.csr ca.crt ca.key
-	openssl x509 -req -in server.csr -CA ca.crt -CAkey ca.key -CAcreateserial -out $@ -sha256 -days $(EXPIRY) -extensions v3_req -extfile openssl.cnf
-
-.PHONY: clean
-clean:
-	-rm -v $(TARGETS)
--- a/integration_test/keypair/testdata/ca.crt
+++ b/integration_test/keypair/testdata/ca.crt
@@ -1,17 +0,0 @@
-----BEGIN CERTIFICATE-----
-MIICojCCAYoCCQCNsdXicWqF2DANBgkqhkiG9w0BAQUFADATMREwDwYDVQQDDAho
-ZWxsby1jYTAeFw0yMDAyMDYwMTMzMzNaFw0zMDAyMDMwMTMzMzNaMBMxETAPBgNV
-BAMMCGhlbGxvLWNhMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAxcPN
-dS88B6ewqVn/m9yO74OLIwNrqMci8l7olP9XlcJhxUZs+3WZQpsSj5nC4yEx8uPQ
-bTtBKnXXVDe+8k7OsLTruu9+isTaYk4o/TZbuw/N31ZAiT0pJw8hdypTQyMLbeDr
-Vl4bbrfbYywx30DyrHxUkgzOWs459Uwc1wWu0W7M21GY4KENHFE3OAcD58FMvvrh
-vgkslATwwW4M2UtXUFJ8XHh26g/J450DU2gwNxpcSdIsvFE6zSyAxU55RElph7mE
-ru9cNWAYhCRZvlZQ2VlH7C6JQ3SHyA9RZmBbPpXhtl9zavFkGx2MEwDp/3FmUukR
-yJnS2KnAo0QdBeS1LQIDAQABMA0GCSqGSIb3DQEBBQUAA4IBAQAXGfoDwuKY4TyF
-fhKg553Y5I6VDCDc97jyW9yyfc0kvPjQc4EGQV+1eQqMSeh2THpgEEKk9hH/g35a
-grPRcBTsEWpbQd16yWyulQeyOtPeWZB2FvAigMaAdMmeXlTs6++gJ6PjPuACa2Jl
-nJ/AjCqKFxkn0yEVkPTY0c/I9A12xhCmATqIrQiK1pPowiFxQb4M8Cm0z0AkaJZr
-iW0NCOJlLzBqRpFquL4umNaIsxTmOshfM70NpQGRjKREBuK6S0qWsRR0wz4b9Rvi
-62qW4zU94q2EDIoCItjHP4twGENXJDC0vLCsKfA5AvbPzszd5/4ifYe2C00Rn7/O
-lIxrspMm
-----END CERTIFICATE-----
--- a/integration_test/keypair/testdata/ca.csr
+++ b/integration_test/keypair/testdata/ca.csr
@@ -1,17 +0,0 @@
-----BEGIN CERTIFICATE REQUEST-----
-MIICrDCCAZQCAQAwEzERMA8GA1UEAwwIaGVsbG8tY2EwggEiMA0GCSqGSIb3DQEB
-AQUAA4IBDwAwggEKAoIBAQDFw811LzwHp7CpWf+b3I7vg4sjA2uoxyLyXuiU/1eV
-wmHFRmz7dZlCmxKPmcLjITHy49BtO0EqdddUN77yTs6wtOu6736KxNpiTij9Nlu7
-D83fVkCJPSknDyF3KlNDIwtt4OtWXhtut9tjLDHfQPKsfFSSDM5azjn1TBzXBa7R
-bszbUZjgoQ0cUTc4BwPnwUy++uG+CSyUBPDBbgzZS1dQUnxceHbqD8njnQNTaDA3
-GlxJ0iy8UTrNLIDFTnlESWmHuYSu71w1YBiEJFm+VlDZWUfsLolDdIfID1FmYFs+
-leG2X3Nq8WQbHYwTAOn/cWZS6RHImdLYqcCjRB0F5LUtAgMBAAGgVDBSBgkqhkiG
-9w0BCQ4xRTBDMAkGA1UdEwQCMAAwCwYDVR0PBAQDAgXgMBQGA1UdEQQNMAuCCWxv
-Y2FsaG9zdDATBgNVHSUEDDAKBggrBgEFBQcDATANBgkqhkiG9w0BAQsFAAOCAQEA
-o/Uthp3NWx0ydTn/GBZI+vA3gI7Qd9UwLvwkeinldRlPM9DOXpG6LR0C40f6u+fj
-mXvUDerveYJI8rpo+Ds0UVqy63AH/zZLG7M96L5Nv2KnK40bkfVNez858Yqp1u17
-/ci1ZsQIElU5v2qKozaHdQThDVtD5ZZdZoQwLvBLE/Dwpe/4VZZFh8smPMR+Mhcq
-+b7gpSy1RiUffk0ZMjuF9Nc9OODdQMTCf+86i0qWXGVzkhfHKAGv+xarHEztcmxF
-GUgUYW8DMvYBjEzaGRM1n0aIFkQO6y8SUXvGMIGBSMC4jfBH3ghIXg1+nD6Uah4D
-16r+CLjFsDUdn/DK/fIQVw==
-----END CERTIFICATE REQUEST-----
--- a/integration_test/keypair/testdata/ca.key
+++ b/integration_test/keypair/testdata/ca.key
@@ -1,27 +0,0 @@
-----BEGIN RSA PRIVATE KEY-----
-MIIEowIBAAKCAQEAxcPNdS88B6ewqVn/m9yO74OLIwNrqMci8l7olP9XlcJhxUZs
-+3WZQpsSj5nC4yEx8uPQbTtBKnXXVDe+8k7OsLTruu9+isTaYk4o/TZbuw/N31ZA
-iT0pJw8hdypTQyMLbeDrVl4bbrfbYywx30DyrHxUkgzOWs459Uwc1wWu0W7M21GY
-4KENHFE3OAcD58FMvvrhvgkslATwwW4M2UtXUFJ8XHh26g/J450DU2gwNxpcSdIs
-vFE6zSyAxU55RElph7mEru9cNWAYhCRZvlZQ2VlH7C6JQ3SHyA9RZmBbPpXhtl9z
-avFkGx2MEwDp/3FmUukRyJnS2KnAo0QdBeS1LQIDAQABAoIBAHSoWtMsaMnPNlu/
-thM32K0auIGP6/rkdQ3pxGLX+M9jmY7oSzNOHHj4xssklZyroS45CmLU2Ez2tG1+
-cMm4iR4dqwxbaBbtpjDlEDLF1PiUiwmadHlANb1PpJsJwZHR41UOn2QUITR/ig+H
-K2gZhM0QjkaU/Uj9a5zyJ/UC6iupmgCtj8ij65B49qKMODxV4gqZstRSZiJ3gb6R
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-+rkyaKUjEwJJQcgpCfUI4t9HAwICqYtw0fQdDDaMak2XTDFnGHn1/VfSi818U5Sa
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-3twL1k0GyeLCxfM2y2QQU/awXISx7nNk2f0umvTWmjrEw632oQSWCSECgYEA3yaF
-zDk7k1u1GdZAh+pQAyUtjzHSvQjiE2JzLaH8BTorACrczRascX5yyMi0QfLYnoYt
-UL9dCb4Z8HUclj55kBSx8anvVtf3XAT3hZ3sm8LV3JLGDeURGS8rGdV+tyFk7zw9
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-u42ZmyRDGEeCgYvDVhT3VBP3WxqkRt9juk/3GwxgpcuikpWYmvaDwFL5H5RH6V+g
-wy9sqJNWzuYKNU2xS8iU0ezJLA5HFon4OBfi7hTIroUwZgzg9LWW2+zqbVHrdQ9T
-9Eumiy1ITNVmUTJW6YOiIQKBgBE4BsEAdZFkVTAeMTKLqQrlFoPjI1DE27UFNsAB
-rNG2cFT9+bW1ly7WxAKsQgSIuaBZ2CtP6Nz0l0nPr5oEThsJDcYJB9faqFKoa3Ua
-/4PxX9E6Xh/6WfxogFno+HMnF4PCUTXtkjNZQkc+moOMJJ0D4DfsfB3BXDZtWiIC
-wDuNAoGBAN5ZFTXwE1VpWxIWq5dV9+0aVOP/eB+h7Pt+u2xyRip31FGcpGEzGniu
-VmOzWApW7NmvD0QWtstJWlCpsw+rOptAL0oVunlB70KuYuA+2Q5g/Cw3kUrvXqbe
-mkCoV21eFAmpU+I6z/n7pUDXPuUsmTkzmwedv0HUuNSQJmHZOMPD
-----END RSA PRIVATE KEY-----
--- a/integration_test/keypair/testdata/ca.srl
+++ b/integration_test/keypair/testdata/ca.srl
@@ -1 +0,0 @@
-9E12C7A1AF348811
--- a/integration_test/keypair/testdata/openssl.cnf
+++ b/integration_test/keypair/testdata/openssl.cnf
@@ -1,14 +0,0 @@
-[ req ]
-distinguished_name = req_distinguished_name
-req_extensions = v3_req
-
-[ req_distinguished_name ]
-
-[ v3_req ]
-basicConstraints = CA:FALSE
-keyUsage = nonRepudiation, digitalSignature, keyEncipherment
-subjectAltName = @alt_names
-extendedKeyUsage = serverAuth
-
-[alt_names]
-DNS.1 = localhost
--- a/integration_test/keypair/testdata/server.crt
+++ b/integration_test/keypair/testdata/server.crt
@@ -1,18 +0,0 @@
-----BEGIN CERTIFICATE-----
-MIIC7zCCAdegAwIBAgIJAJ4Sx6GvNIgRMA0GCSqGSIb3DQEBCwUAMBMxETAPBgNV
-BAMMCGhlbGxvLWNhMB4XDTIwMDIwNjAxMzMzM1oXDTMwMDIwMzAxMzMzM1owFDES
-MBAGA1UEAwwJbG9jYWxob3N0MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKC
-AQEA3CJvDbbiiY/o9lgzeABLCtZe56h2w9Dzejy02M6F7yVyphLtJr+/AxI8k5Er
-MFRitkzgIUkLn/90CZjPI3k5OnLtUAJ4XLj4gUGjziy4TKyVaU0XK41ZSbDAchbW
-349lsEgW5ZnL4qNaZeCvvbYec+RroVc6ZXCcDp4BATTkC3gSVF92+TzrrlbkZ5+W
-YVeoMpAPWDPq2zwQx4RcYlpkpI/fzLezRqjRcZJx3FDgkGuwwhzXfVUpxJ/DYLXZ
-yHCKyaT7e8YIs8e7TRekOwrLCfssfhJSdWopf6aYRZFV+2ovP0Nggn6XJNh/g1QK
-o4wzJAf6v5WMc0jEvb7EuSG+nwIDAQABo0UwQzAJBgNVHRMEAjAAMAsGA1UdDwQE
-AwIF4DAUBgNVHREEDTALgglsb2NhbGhvc3QwEwYDVR0lBAwwCgYIKwYBBQUHAwEw
-DQYJKoZIhvcNAQELBQADggEBACqlq8b7trNRtKUm1PbY7dnrAFCOnV4OT2R98s17
-Q6tmCXM1DvQ101W0ih/lh6iPyU4JM2A0kvO+gizuL/Dmvb6oh+3ox0mMLposptso
-gCE1K3SXlvlcLdM6hXRJ5+XwlSCHM6o2Y4yABnKjT6Zr+CMh86a5abDx33hkJ4QR
-6I+/iBHVLiCVv0wUF3jD/T+HxinEQrB4cQsSgKmfPClrc8n7rkWWE+MdwEL4VZCH
-ufabw178aYibVvJ8k3rushjLlftkDyCNno2rz8YWrnaxabVR0EqSPInyYQenmv2r
-/CedVKpmdH2RV8ubkwqa0s6cmpRkyu6FS2g3LviJhmm0nwQ=
-----END CERTIFICATE-----
--- a/integration_test/keypair/testdata/server.csr
+++ b/integration_test/keypair/testdata/server.csr
@@ -1,17 +0,0 @@
-----BEGIN CERTIFICATE REQUEST-----
-MIICrTCCAZUCAQAwFDESMBAGA1UEAwwJbG9jYWxob3N0MIIBIjANBgkqhkiG9w0B
-AQEFAAOCAQ8AMIIBCgKCAQEA3CJvDbbiiY/o9lgzeABLCtZe56h2w9Dzejy02M6F
-7yVyphLtJr+/AxI8k5ErMFRitkzgIUkLn/90CZjPI3k5OnLtUAJ4XLj4gUGjziy4
-TKyVaU0XK41ZSbDAchbW349lsEgW5ZnL4qNaZeCvvbYec+RroVc6ZXCcDp4BATTk
-C3gSVF92+TzrrlbkZ5+WYVeoMpAPWDPq2zwQx4RcYlpkpI/fzLezRqjRcZJx3FDg
-kGuwwhzXfVUpxJ/DYLXZyHCKyaT7e8YIs8e7TRekOwrLCfssfhJSdWopf6aYRZFV
-+2ovP0Nggn6XJNh/g1QKo4wzJAf6v5WMc0jEvb7EuSG+nwIDAQABoFQwUgYJKoZI
-hvcNAQkOMUUwQzAJBgNVHRMEAjAAMAsGA1UdDwQEAwIF4DAUBgNVHREEDTALggls
-b2NhbGhvc3QwEwYDVR0lBAwwCgYIKwYBBQUHAwEwDQYJKoZIhvcNAQELBQADggEB
-ACUQ0j3XuUZY3fso5tEgOGVjVsTU+C4pIsEw3e1KyIB93i56ANKaq1uBLtnlWtYi
-R4RxZ3Sf08GzoEHAHpWoQ4BQ3WGDQjxSdezbudWMuNnNyvyhkh36tmmp/PLA4iZD
-Q/d1odzGWg1HMqY0/Q3hfz40MQ9IEBBm+5zKw3tLsKNIKdSdlY7Ul3Z9PUsqsOVW
-uF0LKsTMEh1CpbYnOBS2EQjComVM5kYfdQwDNh+BMok8rH7mHFYRmrwYUrU9njsM
-eoKqhLkoSu6hw1Cgd9Yru5lC541KfxsSN4Cj6rkm+Qv/5zjvIPxYZ+akSQQR9hR3
-2O9THHKqaQS0xmD+y8NjfYk=
-----END CERTIFICATE REQUEST-----
--- a/integration_test/keypair/testdata/server.key
+++ b/integration_test/keypair/testdata/server.key
@@ -1,27 +0,0 @@
-----BEGIN RSA PRIVATE KEY-----
-MIIEpAIBAAKCAQEA3CJvDbbiiY/o9lgzeABLCtZe56h2w9Dzejy02M6F7yVyphLt
-Jr+/AxI8k5ErMFRitkzgIUkLn/90CZjPI3k5OnLtUAJ4XLj4gUGjziy4TKyVaU0X
-K41ZSbDAchbW349lsEgW5ZnL4qNaZeCvvbYec+RroVc6ZXCcDp4BATTkC3gSVF92
-+TzrrlbkZ5+WYVeoMpAPWDPq2zwQx4RcYlpkpI/fzLezRqjRcZJx3FDgkGuwwhzX
-fVUpxJ/DYLXZyHCKyaT7e8YIs8e7TRekOwrLCfssfhJSdWopf6aYRZFV+2ovP0Ng
-gn6XJNh/g1QKo4wzJAf6v5WMc0jEvb7EuSG+nwIDAQABAoIBAEYvWFb4C0wurOj2
-ABrvhP2Ekaesh4kxMp+zgTlqxzsTJnWarS/gjKcPBm9KJon3La3P3tnd7y3pBXcV
-2F0IBl4DTHRpBTUS6HBVnENc8LnJgK2dHZkOLPyYtRLrA0Et+A73PQ2hNmchC+5V
-b9K9oQH0Pvim1gCHocnrSIi480hQPazO9/gnHvFtu9Tdsx9kM9jgChhh5VaR+nzM
-uw6MpUSzCri3/W6K5Hz8F1lLQcZ6o3vyyFtLPjFrWT4J1UiHqAoxuCGeWTvMbGQl
-9Cg0SMX4FLBpbIoMonhM3hb9Cw3FVRGU/1i4oF+gEIGlX/v9CPT5HAZmD59rawc8
-11x7yTECgYEA8EYVGKauLHeI1nJdCoVrWI73W1wtwt6prJbzltpoAR4tb3Qu6gBX
-JQNd+Ifhl28lK6lPnCGk/SsmfiKSp/XE4IyS1GBd2LpxWj5R50GePCg4hAzk9Xyx
-M9SJAFQw73pODgu4RWFXTCOMo9crahJ6X/O+MckHqbFqqohJ8nChGDkCgYEA6oro
-Ql/ymO7UdYCay7OlzKeg8ud6XgkZ+wkpSG/5TQ0QZWVN3aSOLztEdVfh3PAqWob0
-KgVhLmq6CYwq+HSzU92bvFqCgYUMU8tYzeRboGLxyEdAGL+EW0j8wQyZKYR5cNz4
-yM0hpM6kbJ0zZqkYVM/XfRT2RTGwTMakF/FOHZcCgYEAmf4guTriuIcoAWEstniK
-Myj16ezrO1Df6Eia+B0kuUqxDhSlmL39HDDLQmU8NYU7in8qEcQSbVwBgKgB3HoM
-42nVFR5qJ2RfD9qPPar1klKo3iExgRCYtcJKyBYtgt6dNi1WvcjEXX0PP1bBcWtE
-WUjrphbUvXKDDabp1eNPrCkCgYBOw/F2APTeyS4Oe+8AQ8eFcDIMARLGK7ZO6Oe1
-TO1jI+UCuD+rFI0vbW7zHV1brkf6+OFcj0vwo6TweeMgZ0il/IFFgvva9UyLg3nC
-Q1NGDJR4Fv1+kiqn4V4IkuuI1tVVws/F16XZzA/J7g0KB/WE3fvXJMgDuskjL36C
-D+aU5wKBgQCvEg+mJYny1QiR/mQuowX34xf4CkMl7Xq9YDH7W/3AlwuPrPNHaZjh
-SvSCz9I8vV0E4ur6atazgCblnvA/G3d4r8YYx+e1l30WJHMgoZRxxHMH74tmUPAj
-Klic16BJikSQclMeFdlJqf2UHd37eEuYnxorpep8YGP7/eN1ghHWAw==
-----END RSA PRIVATE KEY-----
--- a/integration_test/kubeconfig/kubeconfig.go
+++ b/integration_test/kubeconfig/kubeconfig.go
@@ -1,80 +0,0 @@
-package kubeconfig
-
-import (
-	"html/template"
-	"os"
-	"path/filepath"
-	"testing"
-
-	"gopkg.in/yaml.v2"
-)
-
-// Values represents values in .kubeconfig template.
-type Values struct {
-	Issuer                      string
-	ExtraScopes                 string
-	IDPCertificateAuthority     string
-	IDPCertificateAuthorityData string
-	IDToken                     string
-	RefreshToken                string
-}
-
-// Create creates a kubeconfig file and returns path to it.
-func Create(t *testing.T, v *Values) string {
-	t.Helper()
-	f, err := os.Create(filepath.Join(t.TempDir(), "kubeconfig"))
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer f.Close()
-	tpl, err := template.ParseFiles("kubeconfig/testdata/kubeconfig.yaml")
-	if err != nil {
-		t.Fatal(err)
-	}
-	if err := tpl.Execute(f, v); err != nil {
-		t.Fatal(err)
-	}
-	return f.Name()
-}
-
-type AuthProviderConfig struct {
-	IDToken      string `yaml:"id-token"`
-	RefreshToken string `yaml:"refresh-token"`
-}
-
-// Verify returns true if the kubeconfig has valid values.
-func Verify(t *testing.T, kubeconfig string, want AuthProviderConfig) {
-	t.Helper()
-	f, err := os.Open(kubeconfig)
-	if err != nil {
-		t.Errorf("could not open kubeconfig: %s", err)
-		return
-	}
-	defer f.Close()
-
-	var y struct {
-		Users []struct {
-			User struct {
-				AuthProvider struct {
-					Config AuthProviderConfig `yaml:"config"`
-				} `yaml:"auth-provider"`
-			} `yaml:"user"`
-		} `yaml:"users"`
-	}
-	d := yaml.NewDecoder(f)
-	if err := d.Decode(&y); err != nil {
-		t.Errorf("could not decode YAML: %s", err)
-		return
-	}
-	if len(y.Users) != 1 {
-		t.Errorf("len(users) wants 1 but %d", len(y.Users))
-		return
-	}
-	currentConfig := y.Users[0].User.AuthProvider.Config
-	if currentConfig.IDToken != want.IDToken {
-		t.Errorf("id-token wants %s but %s", want.IDToken, currentConfig.IDToken)
-	}
-	if currentConfig.RefreshToken != want.RefreshToken {
-		t.Errorf("refresh-token wants %s but %s", want.RefreshToken, currentConfig.RefreshToken)
-	}
-}
--- a/integration_test/kubeconfig/testdata/dummy.yaml
+++ b/integration_test/kubeconfig/testdata/dummy.yaml
@@ -1,4 +0,0 @@
-apiVersion: v1
-current-context: dummy
-kind: Config
-preferences: {}
--- a/integration_test/kubeconfig/testdata/kubeconfig.yaml
+++ b/integration_test/kubeconfig/testdata/kubeconfig.yaml
@@ -1,37 +0,0 @@
-apiVersion: v1
-kind: Config
-clusters:
-  - cluster:
-      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:
-      config:
-        client-id: kubernetes
-        client-secret: a3c508c3-73c9-42e2-ab14-487a1bf67c33
-        idp-issuer-url: {{ .Issuer }}
-#{{ if .ExtraScopes }}
-        extra-scopes: {{ .ExtraScopes }}
-#{{ end }}
-#{{ if .IDPCertificateAuthority }}
-        idp-certificate-authority: {{ .IDPCertificateAuthority }}
-#{{ end }}
-#{{ if .IDPCertificateAuthorityData }}
-        idp-certificate-authority-data: {{ .IDPCertificateAuthorityData }}
-#{{ end }}
-#{{ if .IDToken }}
-        id-token: {{ .IDToken }}
-#{{ end }}
-#{{ if .RefreshToken }}
-        refresh-token: {{ .RefreshToken }}
-#{{ end }}
-      name: oidc
--- a/integration_test/oidcserver/handler/handler.go
+++ b/integration_test/oidcserver/handler/handler.go
@@ -1,147 +0,0 @@
-// Package handler provides a HTTP handler for the OpenID Connect Provider.
-package handler
-
-import (
-	"encoding/json"
-	"errors"
-	"fmt"
-	"net/http"
-	"testing"
-)
-
-func New(t *testing.T, provider Provider) *Handler {
-	return &Handler{t, provider}
-}
-
-// Handler provides a HTTP handler for the OpenID Connect Provider.
-// You need to implement the Provider interface.
-// Note that this skips some security checks and is only for testing.
-type Handler struct {
-	t        *testing.T
-	provider Provider
-}
-
-func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
-	wr := &responseWriterRecorder{w, 200}
-	err := h.serveHTTP(wr, r)
-	if err == nil {
-		h.t.Logf("%d %s %s", wr.statusCode, r.Method, r.RequestURI)
-		return
-	}
-	if errResp := new(ErrorResponse); errors.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 fmt.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 fmt.Errorf("could not render json: %w", err)
-		}
-	case m == "GET" && p == "/auth":
-		q := r.URL.Query()
-		redirectURI, state := q.Get("redirect_uri"), q.Get("state")
-		code, err := h.provider.AuthenticateCode(AuthenticationRequest{
-			RedirectURI:         redirectURI,
-			State:               state,
-			Scope:               q.Get("scope"),
-			Nonce:               q.Get("nonce"),
-			CodeChallenge:       q.Get("code_challenge"),
-			CodeChallengeMethod: q.Get("code_challenge_method"),
-			RawQuery:            q,
-		})
-		if err != nil {
-			return fmt.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 fmt.Errorf("could not parse the form: %w", err)
-		}
-		grantType := r.Form.Get("grant_type")
-		switch grantType {
-		case "authorization_code":
-			tokenResponse, err := h.provider.Exchange(TokenRequest{
-				Code:         r.Form.Get("code"),
-				CodeVerifier: r.Form.Get("code_verifier"),
-			})
-			if err != nil {
-				return fmt.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 fmt.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 fmt.Errorf("authentication error: %w", err)
-			}
-			w.Header().Add("Content-Type", "application/json")
-			e := json.NewEncoder(w)
-			if err := e.Encode(tokenResponse); err != nil {
-				return fmt.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 fmt.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 fmt.Errorf("could not render json: %w", err)
-			}
-		default:
-			// 5.2. Error Response
-			// https://tools.ietf.org/html/rfc6749#section-5.2
-			return &ErrorResponse{
-				Code:        "invalid_grant",
-				Description: fmt.Sprintf("unknown grant_type %s", grantType),
-			}
-		}
-	default:
-		http.NotFound(w, r)
-	}
-	return nil
-}
--- a/integration_test/oidcserver/handler/types.go
+++ b/integration_test/oidcserver/handler/types.go
@@ -1,87 +0,0 @@
-package handler
-
-import (
-	"fmt"
-	"net/url"
-)
-
-// Provider provides discovery and authentication methods.
-// If an implemented method returns an ErrorResponse,
-// the handler will respond 400 and corresponding json of the ErrorResponse.
-// Otherwise, the handler will respond 500 and fail the current test.
-type Provider interface {
-	Discovery() *DiscoveryResponse
-	GetCertificates() *CertificatesResponse
-	AuthenticateCode(req AuthenticationRequest) (code string, err error)
-	Exchange(req TokenRequest) (*TokenResponse, error)
-	AuthenticatePassword(username, password, scope string) (*TokenResponse, error)
-	Refresh(refreshToken string) (*TokenResponse, error)
-}
-
-type DiscoveryResponse struct {
-	Issuer                            string   `json:"issuer"`
-	AuthorizationEndpoint             string   `json:"authorization_endpoint"`
-	TokenEndpoint                     string   `json:"token_endpoint"`
-	UserinfoEndpoint                  string   `json:"userinfo_endpoint"`
-	RevocationEndpoint                string   `json:"revocation_endpoint"`
-	JwksURI                           string   `json:"jwks_uri"`
-	ResponseTypesSupported            []string `json:"response_types_supported"`
-	SubjectTypesSupported             []string `json:"subject_types_supported"`
-	IDTokenSigningAlgValuesSupported  []string `json:"id_token_signing_alg_values_supported"`
-	ScopesSupported                   []string `json:"scopes_supported"`
-	TokenEndpointAuthMethodsSupported []string `json:"token_endpoint_auth_methods_supported"`
-	ClaimsSupported                   []string `json:"claims_supported"`
-	CodeChallengeMethodsSupported     []string `json:"code_challenge_methods_supported"`
-}
-
-type CertificatesResponse struct {
-	Keys []*CertificatesResponseKey `json:"keys"`
-}
-
-type CertificatesResponseKey struct {
-	Kty string `json:"kty"`
-	Alg string `json:"alg"`
-	Use string `json:"use"`
-	Kid string `json:"kid"`
-	N   string `json:"n"`
-	E   string `json:"e"`
-}
-
-// AuthenticationRequest represents a type of:
-// https://openid.net/specs/openid-connect-core-1_0.html#AuthRequest
-type AuthenticationRequest struct {
-	RedirectURI         string
-	State               string
-	Scope               string // space separated string
-	Nonce               string
-	CodeChallenge       string
-	CodeChallengeMethod string
-	RawQuery            url.Values
-}
-
-// TokenRequest represents a type of:
-// https://openid.net/specs/openid-connect-core-1_0.html#TokenRequest
-type TokenRequest struct {
-	Code         string
-	CodeVerifier string
-}
-
-type TokenResponse struct {
-	AccessToken  string `json:"access_token"`
-	TokenType    string `json:"token_type"`
-	RefreshToken string `json:"refresh_token"`
-	ExpiresIn    int    `json:"expires_in"`
-	IDToken      string `json:"id_token"`
-}
-
-// ErrorResponse represents an error response described in the following section:
-// 5.2 Error Response
-// https://tools.ietf.org/html/rfc6749#section-5.2
-type ErrorResponse struct {
-	Code        string `json:"error"`
-	Description string `json:"error_description"`
-}
-
-func (err *ErrorResponse) Error() string {
-	return fmt.Sprintf("%s(%s)", err.Code, err.Description)
-}
--- a/integration_test/oidcserver/http/http.go
+++ b/integration_test/oidcserver/http/http.go
@@ -1,78 +0,0 @@
-// Package http provides a http server running on localhost for testing.
-package http
-
-import (
-	"context"
-	"net"
-	"net/http"
-	"testing"
-
-	"github.com/int128/kubelogin/integration_test/keypair"
-)
-
-type Shutdowner interface {
-	Shutdown(t *testing.T, ctx context.Context)
-}
-
-type shutdowner struct {
-	s *http.Server
-}
-
-func (s *shutdowner) Shutdown(t *testing.T, ctx context.Context) {
-	if err := s.s.Shutdown(ctx); err != nil {
-		t.Errorf("could not shutdown the server: %s", err)
-	}
-}
-
-func Start(t *testing.T, h http.Handler, k keypair.KeyPair) (string, Shutdowner) {
-	if k == keypair.None {
-		return startNoTLS(t, h)
-	}
-	return startTLS(t, h, k)
-}
-
-func startNoTLS(t *testing.T, h http.Handler) (string, *shutdowner) {
-	t.Helper()
-	l, port := newLocalhostListener(t)
-	url := "http://localhost:" + port
-	s := &http.Server{
-		Handler: h,
-	}
-	go func() {
-		err := s.Serve(l)
-		if err != nil && err != http.ErrServerClosed {
-			t.Error(err)
-		}
-	}()
-	return url, &shutdowner{s}
-}
-
-func startTLS(t *testing.T, h http.Handler, k keypair.KeyPair) (string, *shutdowner) {
-	t.Helper()
-	l, port := newLocalhostListener(t)
-	url := "https://localhost:" + port
-	s := &http.Server{
-		Handler: h,
-	}
-	go func() {
-		err := s.ServeTLS(l, k.CertPath, k.KeyPath)
-		if err != nil && err != http.ErrServerClosed {
-			t.Error(err)
-		}
-	}()
-	return url, &shutdowner{s}
-}
-
-func newLocalhostListener(t *testing.T) (net.Listener, string) {
-	t.Helper()
-	l, err := net.Listen("tcp", "localhost:0")
-	if err != nil {
-		t.Fatalf("Could not create a listener: %s", err)
-	}
-	addr := l.Addr().String()
-	_, port, err := net.SplitHostPort(addr)
-	if err != nil {
-		t.Fatalf("Could not parse the address %s: %s", addr, err)
-	}
-	return l, port
-}
--- a/integration_test/oidcserver/server.go
+++ b/integration_test/oidcserver/server.go
@@ -1,217 +0,0 @@
-// Package oidcserver provides a stub of OpenID Connect provider.
-package oidcserver
-
-import (
-	"crypto/sha256"
-	"encoding/base64"
-	"fmt"
-	"math/big"
-	"strings"
-	"testing"
-	"time"
-
-	"github.com/int128/kubelogin/integration_test/keypair"
-	"github.com/int128/kubelogin/integration_test/oidcserver/handler"
-	"github.com/int128/kubelogin/integration_test/oidcserver/http"
-	"github.com/int128/kubelogin/pkg/testing/jwt"
-)
-
-type Server interface {
-	http.Shutdowner
-	IssuerURL() string
-	SetConfig(Config)
-	LastTokenResponse() *handler.TokenResponse
-}
-
-// Want represents a set of expected values.
-type Want struct {
-	Scope               string
-	RedirectURIPrefix   string
-	CodeChallengeMethod string            // optional
-	ExtraParams         map[string]string // optional
-	Username            string            // optional
-	Password            string            // optional
-	RefreshToken        string            // optional
-}
-
-// Response represents a set of response values.
-type Response struct {
-	IDTokenExpiry                 time.Time
-	RefreshToken                  string
-	RefreshError                  string   // if set, Refresh() will return the error
-	CodeChallengeMethodsSupported []string // optional
-}
-
-// Config represents a configuration of the OpenID Connect provider.
-type Config struct {
-	Want     Want
-	Response Response
-}
-
-// New starts a HTTP server for the OpenID Connect provider.
-func New(t *testing.T, k keypair.KeyPair, c Config) Server {
-	sv := server{Config: c, t: t}
-	sv.issuerURL, sv.Shutdowner = http.Start(t, handler.New(t, &sv), k)
-	return &sv
-}
-
-type server struct {
-	Config
-	http.Shutdowner
-	t                         *testing.T
-	issuerURL                 string
-	lastAuthenticationRequest *handler.AuthenticationRequest
-	lastTokenResponse         *handler.TokenResponse
-}
-
-func (sv *server) IssuerURL() string {
-	return sv.issuerURL
-}
-
-func (sv *server) SetConfig(cfg Config) {
-	sv.Config = cfg
-}
-
-func (sv *server) LastTokenResponse() *handler.TokenResponse {
-	return sv.lastTokenResponse
-}
-
-func (sv *server) Discovery() *handler.DiscoveryResponse {
-	// based on https://accounts.google.com/.well-known/openid-configuration
-	return &handler.DiscoveryResponse{
-		Issuer:                            sv.issuerURL,
-		AuthorizationEndpoint:             sv.issuerURL + "/auth",
-		TokenEndpoint:                     sv.issuerURL + "/token",
-		JwksURI:                           sv.issuerURL + "/certs",
-		UserinfoEndpoint:                  sv.issuerURL + "/userinfo",
-		RevocationEndpoint:                sv.issuerURL + "/revoke",
-		ResponseTypesSupported:            []string{"code id_token"},
-		SubjectTypesSupported:             []string{"public"},
-		IDTokenSigningAlgValuesSupported:  []string{"RS256"},
-		ScopesSupported:                   []string{"openid", "email", "profile"},
-		TokenEndpointAuthMethodsSupported: []string{"client_secret_post", "client_secret_basic"},
-		CodeChallengeMethodsSupported:     sv.Config.Response.CodeChallengeMethodsSupported,
-		ClaimsSupported:                   []string{"aud", "email", "exp", "iat", "iss", "name", "sub"},
-	}
-}
-
-func (sv *server) GetCertificates() *handler.CertificatesResponse {
-	idTokenKeyPair := jwt.PrivateKey
-	return &handler.CertificatesResponse{
-		Keys: []*handler.CertificatesResponseKey{
-			{
-				Kty: "RSA",
-				Alg: "RS256",
-				Use: "sig",
-				Kid: "dummy",
-				E:   base64.RawURLEncoding.EncodeToString(big.NewInt(int64(idTokenKeyPair.E)).Bytes()),
-				N:   base64.RawURLEncoding.EncodeToString(idTokenKeyPair.N.Bytes()),
-			},
-		},
-	}
-}
-
-func (sv *server) AuthenticateCode(req handler.AuthenticationRequest) (code string, err error) {
-	if req.Scope != sv.Want.Scope {
-		sv.t.Errorf("scope wants `%s` but was `%s`", sv.Want.Scope, req.Scope)
-	}
-	if !strings.HasPrefix(req.RedirectURI, sv.Want.RedirectURIPrefix) {
-		sv.t.Errorf("redirectURI wants prefix `%s` but was `%s`", sv.Want.RedirectURIPrefix, req.RedirectURI)
-	}
-	if req.CodeChallengeMethod != sv.Want.CodeChallengeMethod {
-		sv.t.Errorf("code_challenge_method wants `%s` but was `%s`", sv.Want.CodeChallengeMethod, req.CodeChallengeMethod)
-	}
-	for k, v := range sv.Want.ExtraParams {
-		got := req.RawQuery.Get(k)
-		if got != v {
-			sv.t.Errorf("parameter %s wants `%s` but was `%s`", k, v, got)
-		}
-	}
-	sv.lastAuthenticationRequest = &req
-	return "YOUR_AUTH_CODE", nil
-}
-
-func (sv *server) Exchange(req handler.TokenRequest) (*handler.TokenResponse, error) {
-	if req.Code != "YOUR_AUTH_CODE" {
-		return nil, fmt.Errorf("code wants %s but was %s", "YOUR_AUTH_CODE", req.Code)
-	}
-	if sv.lastAuthenticationRequest.CodeChallengeMethod == "S256" {
-		// https://tools.ietf.org/html/rfc7636#section-4.6
-		challenge := computeS256Challenge(req.CodeVerifier)
-		if challenge != sv.lastAuthenticationRequest.CodeChallenge {
-			sv.t.Errorf("pkce S256 challenge did not match (want %s but was %s)", sv.lastAuthenticationRequest.CodeChallenge, challenge)
-		}
-	}
-	resp := &handler.TokenResponse{
-		TokenType:    "Bearer",
-		ExpiresIn:    3600,
-		AccessToken:  "YOUR_ACCESS_TOKEN",
-		RefreshToken: sv.Response.RefreshToken,
-		IDToken: jwt.EncodeF(sv.t, func(claims *jwt.Claims) {
-			claims.Issuer = sv.issuerURL
-			claims.Subject = "SUBJECT"
-			claims.IssuedAt = sv.Response.IDTokenExpiry.Add(-time.Hour).Unix()
-			claims.ExpiresAt = sv.Response.IDTokenExpiry.Unix()
-			claims.Audience = []string{"kubernetes"}
-			claims.Nonce = sv.lastAuthenticationRequest.Nonce
-		}),
-	}
-	sv.lastTokenResponse = resp
-	return resp, nil
-}
-
-func computeS256Challenge(verifier string) string {
-	c := sha256.Sum256([]byte(verifier))
-	return base64.URLEncoding.WithPadding(base64.NoPadding).EncodeToString(c[:])
-}
-
-func (sv *server) AuthenticatePassword(username, password, scope string) (*handler.TokenResponse, error) {
-	if scope != sv.Want.Scope {
-		sv.t.Errorf("scope wants `%s` but was `%s`", sv.Want.Scope, scope)
-	}
-	if username != sv.Want.Username {
-		sv.t.Errorf("username wants `%s` but was `%s`", sv.Want.Username, username)
-	}
-	if password != sv.Want.Password {
-		sv.t.Errorf("password wants `%s` but was `%s`", sv.Want.Password, password)
-	}
-	resp := &handler.TokenResponse{
-		TokenType:    "Bearer",
-		ExpiresIn:    3600,
-		AccessToken:  "YOUR_ACCESS_TOKEN",
-		RefreshToken: sv.Response.RefreshToken,
-		IDToken: jwt.EncodeF(sv.t, func(claims *jwt.Claims) {
-			claims.Issuer = sv.issuerURL
-			claims.Subject = "SUBJECT"
-			claims.IssuedAt = sv.Response.IDTokenExpiry.Add(-time.Hour).Unix()
-			claims.ExpiresAt = sv.Response.IDTokenExpiry.Unix()
-			claims.Audience = []string{"kubernetes"}
-		}),
-	}
-	sv.lastTokenResponse = resp
-	return resp, nil
-}
-
-func (sv *server) Refresh(refreshToken string) (*handler.TokenResponse, error) {
-	if refreshToken != sv.Want.RefreshToken {
-		sv.t.Errorf("refreshToken wants %s but was %s", sv.Want.RefreshToken, refreshToken)
-	}
-	if sv.Response.RefreshError != "" {
-		return nil, &handler.ErrorResponse{Code: "invalid_request", Description: sv.Response.RefreshError}
-	}
-	resp := &handler.TokenResponse{
-		TokenType:    "Bearer",
-		ExpiresIn:    3600,
-		AccessToken:  "YOUR_ACCESS_TOKEN",
-		RefreshToken: sv.Response.RefreshToken,
-		IDToken: jwt.EncodeF(sv.t, func(claims *jwt.Claims) {
-			claims.Issuer = sv.issuerURL
-			claims.Subject = "SUBJECT"
-			claims.IssuedAt = sv.Response.IDTokenExpiry.Add(-time.Hour).Unix()
-			claims.ExpiresAt = sv.Response.IDTokenExpiry.Unix()
-			claims.Audience = []string{"kubernetes"}
-		}),
-	}
-	sv.lastTokenResponse = resp
-	return resp, nil
-}
--- a/integration_test/standalone_test.go
+++ b/integration_test/standalone_test.go
@@ -1,334 +0,0 @@
-package integration_test
-
-import (
-	"context"
-	"os"
-	"testing"
-	"time"
-
-	"github.com/int128/kubelogin/integration_test/httpdriver"
-	"github.com/int128/kubelogin/integration_test/keypair"
-	"github.com/int128/kubelogin/integration_test/kubeconfig"
-	"github.com/int128/kubelogin/integration_test/oidcserver"
-	"github.com/int128/kubelogin/pkg/di"
-	"github.com/int128/kubelogin/pkg/infrastructure/browser"
-	"github.com/int128/kubelogin/pkg/testing/clock"
-	"github.com/int128/kubelogin/pkg/testing/logger"
-)
-
-// Run the integration tests of the Login use-case.
-//
-// 1. Start the auth server.
-// 2. Run the Cmd.
-// 3. Open a request for the local server.
-// 4. Verify the kubeconfig.
-//
-func TestStandalone(t *testing.T) {
-	timeout := 3 * time.Second
-	now := time.Date(2020, 1, 1, 0, 0, 0, 0, time.UTC)
-
-	for name, tc := range map[string]struct {
-		keyPair keypair.KeyPair
-		args    []string
-	}{
-		"NoTLS": {},
-		"TLS": {
-			keyPair: keypair.Server,
-		},
-	} {
-		httpDriverOption := httpdriver.Option{
-			TLSConfig:    tc.keyPair.TLSConfig,
-			BodyContains: "Authenticated",
-		}
-
-		t.Run(name, func(t *testing.T) {
-			t.Run("AuthCode", func(t *testing.T) {
-				t.Parallel()
-				ctx, cancel := context.WithTimeout(context.TODO(), timeout)
-				defer cancel()
-				sv := oidcserver.New(t, tc.keyPair, oidcserver.Config{
-					Want: oidcserver.Want{
-						Scope:             "openid",
-						RedirectURIPrefix: "http://localhost:",
-					},
-					Response: oidcserver.Response{
-						IDTokenExpiry: now.Add(time.Hour),
-					},
-				})
-				defer sv.Shutdown(t, ctx)
-				kubeConfigFilename := kubeconfig.Create(t, &kubeconfig.Values{
-					Issuer:                  sv.IssuerURL(),
-					IDPCertificateAuthority: tc.keyPair.CACertPath,
-				})
-				defer os.Remove(kubeConfigFilename)
-				runStandalone(t, ctx, standaloneConfig{
-					issuerURL:          sv.IssuerURL(),
-					kubeConfigFilename: kubeConfigFilename,
-					httpDriver:         httpdriver.New(ctx, t, httpDriverOption),
-					now:                now,
-				})
-				kubeconfig.Verify(t, kubeConfigFilename, kubeconfig.AuthProviderConfig{
-					IDToken:      sv.LastTokenResponse().IDToken,
-					RefreshToken: sv.LastTokenResponse().RefreshToken,
-				})
-			})
-
-			t.Run("ROPC", func(t *testing.T) {
-				t.Parallel()
-				ctx, cancel := context.WithTimeout(context.TODO(), timeout)
-				defer cancel()
-				sv := oidcserver.New(t, tc.keyPair, oidcserver.Config{
-					Want: oidcserver.Want{
-						Scope:             "openid",
-						RedirectURIPrefix: "http://localhost:",
-						Username:          "USER1",
-						Password:          "PASS1",
-					},
-					Response: oidcserver.Response{
-						IDTokenExpiry: now.Add(time.Hour),
-					},
-				})
-				defer sv.Shutdown(t, ctx)
-				kubeConfigFilename := kubeconfig.Create(t, &kubeconfig.Values{
-					Issuer:                  sv.IssuerURL(),
-					IDPCertificateAuthority: tc.keyPair.CACertPath,
-				})
-				defer os.Remove(kubeConfigFilename)
-				runStandalone(t, ctx, standaloneConfig{
-					issuerURL:          sv.IssuerURL(),
-					kubeConfigFilename: kubeConfigFilename,
-					httpDriver:         httpdriver.Zero(t),
-					now:                now,
-					args: []string{
-						"--username", "USER1",
-						"--password", "PASS1",
-					},
-				})
-				kubeconfig.Verify(t, kubeConfigFilename, kubeconfig.AuthProviderConfig{
-					IDToken:      sv.LastTokenResponse().IDToken,
-					RefreshToken: sv.LastTokenResponse().RefreshToken,
-				})
-			})
-
-			t.Run("TokenLifecycle", func(t *testing.T) {
-				t.Parallel()
-				ctx, cancel := context.WithTimeout(context.TODO(), timeout)
-				defer cancel()
-				sv := oidcserver.New(t, tc.keyPair, oidcserver.Config{})
-				defer sv.Shutdown(t, ctx)
-				kubeConfigFilename := kubeconfig.Create(t, &kubeconfig.Values{
-					Issuer:                  sv.IssuerURL(),
-					IDPCertificateAuthority: tc.keyPair.CACertPath,
-				})
-				defer os.Remove(kubeConfigFilename)
-
-				t.Run("NoToken", func(t *testing.T) {
-					sv.SetConfig(oidcserver.Config{
-						Want: oidcserver.Want{
-							Scope:             "openid",
-							RedirectURIPrefix: "http://localhost:",
-						},
-						Response: oidcserver.Response{
-							IDTokenExpiry: now.Add(time.Hour),
-							RefreshToken:  "REFRESH_TOKEN_1",
-						},
-					})
-					runStandalone(t, ctx, standaloneConfig{
-						issuerURL:          sv.IssuerURL(),
-						kubeConfigFilename: kubeConfigFilename,
-						httpDriver:         httpdriver.New(ctx, t, httpDriverOption),
-						now:                now,
-					})
-					kubeconfig.Verify(t, kubeConfigFilename, kubeconfig.AuthProviderConfig{
-						IDToken:      sv.LastTokenResponse().IDToken,
-						RefreshToken: "REFRESH_TOKEN_1",
-					})
-				})
-				t.Run("Valid", func(t *testing.T) {
-					sv.SetConfig(oidcserver.Config{})
-					runStandalone(t, ctx, standaloneConfig{
-						issuerURL:          sv.IssuerURL(),
-						kubeConfigFilename: kubeConfigFilename,
-						httpDriver:         httpdriver.Zero(t),
-						now:                now,
-					})
-					kubeconfig.Verify(t, kubeConfigFilename, kubeconfig.AuthProviderConfig{
-						IDToken:      sv.LastTokenResponse().IDToken,
-						RefreshToken: "REFRESH_TOKEN_1",
-					})
-				})
-				t.Run("Refresh", func(t *testing.T) {
-					sv.SetConfig(oidcserver.Config{
-						Want: oidcserver.Want{
-							Scope:             "openid",
-							RedirectURIPrefix: "http://localhost:",
-							RefreshToken:      "REFRESH_TOKEN_1",
-						},
-						Response: oidcserver.Response{
-							IDTokenExpiry: now.Add(3 * time.Hour),
-							RefreshToken:  "REFRESH_TOKEN_2",
-						},
-					})
-					runStandalone(t, ctx, standaloneConfig{
-						issuerURL:          sv.IssuerURL(),
-						kubeConfigFilename: kubeConfigFilename,
-						httpDriver:         httpdriver.New(ctx, t, httpDriverOption),
-						now:                now.Add(2 * time.Hour),
-					})
-					kubeconfig.Verify(t, kubeConfigFilename, kubeconfig.AuthProviderConfig{
-						IDToken:      sv.LastTokenResponse().IDToken,
-						RefreshToken: "REFRESH_TOKEN_2",
-					})
-				})
-				t.Run("RefreshAgain", func(t *testing.T) {
-					sv.SetConfig(oidcserver.Config{
-						Want: oidcserver.Want{
-							Scope:             "openid",
-							RedirectURIPrefix: "http://localhost:",
-							RefreshToken:      "REFRESH_TOKEN_2",
-						},
-						Response: oidcserver.Response{
-							IDTokenExpiry: now.Add(5 * time.Hour),
-						},
-					})
-					runStandalone(t, ctx, standaloneConfig{
-						issuerURL:          sv.IssuerURL(),
-						kubeConfigFilename: kubeConfigFilename,
-						httpDriver:         httpdriver.New(ctx, t, httpDriverOption),
-						now:                now.Add(4 * time.Hour),
-					})
-					kubeconfig.Verify(t, kubeConfigFilename, kubeconfig.AuthProviderConfig{
-						IDToken:      sv.LastTokenResponse().IDToken,
-						RefreshToken: "REFRESH_TOKEN_2",
-					})
-				})
-			})
-		})
-	}
-
-	t.Run("TLSData", func(t *testing.T) {
-		t.Parallel()
-		ctx, cancel := context.WithTimeout(context.TODO(), timeout)
-		defer cancel()
-		sv := oidcserver.New(t, keypair.Server, oidcserver.Config{
-			Want: oidcserver.Want{
-				Scope:             "openid",
-				RedirectURIPrefix: "http://localhost:",
-			},
-			Response: oidcserver.Response{
-				IDTokenExpiry: now.Add(time.Hour),
-			},
-		})
-		defer sv.Shutdown(t, ctx)
-		kubeConfigFilename := kubeconfig.Create(t, &kubeconfig.Values{
-			Issuer:                      sv.IssuerURL(),
-			IDPCertificateAuthorityData: keypair.Server.CACertBase64,
-		})
-		defer os.Remove(kubeConfigFilename)
-		runStandalone(t, ctx, standaloneConfig{
-			issuerURL:          sv.IssuerURL(),
-			kubeConfigFilename: kubeConfigFilename,
-			httpDriver:         httpdriver.New(ctx, t, httpdriver.Option{TLSConfig: keypair.Server.TLSConfig}),
-			now:                now,
-		})
-		kubeconfig.Verify(t, kubeConfigFilename, kubeconfig.AuthProviderConfig{
-			IDToken:      sv.LastTokenResponse().IDToken,
-			RefreshToken: sv.LastTokenResponse().RefreshToken,
-		})
-	})
-
-	t.Run("env_KUBECONFIG", func(t *testing.T) {
-		ctx, cancel := context.WithTimeout(context.TODO(), timeout)
-		defer cancel()
-		sv := oidcserver.New(t, keypair.None, oidcserver.Config{
-			Want: oidcserver.Want{
-				Scope:             "openid",
-				RedirectURIPrefix: "http://localhost:",
-			},
-			Response: oidcserver.Response{
-				IDTokenExpiry: now.Add(time.Hour),
-			},
-		})
-		defer sv.Shutdown(t, ctx)
-		kubeConfigFilename := kubeconfig.Create(t, &kubeconfig.Values{
-			Issuer: sv.IssuerURL(),
-		})
-		defer os.Remove(kubeConfigFilename)
-		setenv(t, "KUBECONFIG", kubeConfigFilename+string(os.PathListSeparator)+"kubeconfig/testdata/dummy.yaml")
-		defer unsetenv(t, "KUBECONFIG")
-		runStandalone(t, ctx, standaloneConfig{
-			issuerURL:  sv.IssuerURL(),
-			httpDriver: httpdriver.New(ctx, t, httpdriver.Option{}),
-			now:        now,
-		})
-		kubeconfig.Verify(t, kubeConfigFilename, kubeconfig.AuthProviderConfig{
-			IDToken:      sv.LastTokenResponse().IDToken,
-			RefreshToken: sv.LastTokenResponse().RefreshToken,
-		})
-	})
-
-	t.Run("ExtraScopes", func(t *testing.T) {
-		t.Parallel()
-		ctx, cancel := context.WithTimeout(context.TODO(), timeout)
-		defer cancel()
-		sv := oidcserver.New(t, keypair.None, oidcserver.Config{
-			Want: oidcserver.Want{
-				Scope:             "profile groups openid",
-				RedirectURIPrefix: "http://localhost:",
-			},
-			Response: oidcserver.Response{
-				IDTokenExpiry: now.Add(time.Hour),
-			},
-		})
-		defer sv.Shutdown(t, ctx)
-		kubeConfigFilename := kubeconfig.Create(t, &kubeconfig.Values{
-			Issuer:      sv.IssuerURL(),
-			ExtraScopes: "profile,groups",
-		})
-		defer os.Remove(kubeConfigFilename)
-		runStandalone(t, ctx, standaloneConfig{
-			issuerURL:          sv.IssuerURL(),
-			kubeConfigFilename: kubeConfigFilename,
-			httpDriver:         httpdriver.New(ctx, t, httpdriver.Option{}),
-			now:                now,
-		})
-		kubeconfig.Verify(t, kubeConfigFilename, kubeconfig.AuthProviderConfig{
-			IDToken:      sv.LastTokenResponse().IDToken,
-			RefreshToken: sv.LastTokenResponse().RefreshToken,
-		})
-	})
-}
-
-type standaloneConfig struct {
-	issuerURL          string
-	kubeConfigFilename string
-	httpDriver         browser.Interface
-	now                time.Time
-	args               []string
-}
-
-func runStandalone(t *testing.T, ctx context.Context, cfg standaloneConfig) {
-	cmd := di.NewCmdForHeadless(clock.Fake(cfg.now), os.Stdin, os.Stdout, logger.New(t), cfg.httpDriver)
-	exitCode := cmd.Run(ctx, append([]string{
-		"kubelogin",
-		"--kubeconfig", cfg.kubeConfigFilename,
-		"--listen-address", "127.0.0.1:0",
-	}, cfg.args...), "HEAD")
-	if exitCode != 0 {
-		t.Errorf("exit status wants 0 but %d", exitCode)
-	}
-}
-
-func setenv(t *testing.T, key, value string) {
-	t.Helper()
-	if err := os.Setenv(key, value); err != nil {
-		t.Fatalf("Could not set the env var %s=%s: %s", key, value, err)
-	}
-}
-
-func unsetenv(t *testing.T, key string) {
-	t.Helper()
-	if err := os.Unsetenv(key); err != nil {
-		t.Fatalf("Could not unset the env var %s: %s", key, err)
-	}
-}
--- a/main.go
+++ b/main.go
@@ -1,14 +1,57 @@
 package main

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

-	"github.com/int128/kubelogin/pkg/di"
+	"k8s.io/client-go/tools/clientcmd/api"
 )

-var version = "HEAD"
-
 func main() {
-	os.Exit(di.NewCmd().Run(context.Background(), os.Args, version))
+	kubeConfigPath, err := FindKubeConfig()
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	log.Printf("Reading config from %s", kubeConfigPath)
+	kubeConfig, err := ReadKubeConfig(kubeConfigPath)
+	if err != nil {
+		log.Fatal(err)
+	}
+	log.Printf("Using current context: %s", kubeConfig.CurrentContext)
+
+	authInfo := GetCurrentAuthInfo(*kubeConfig)
+	if authInfo == nil {
+		log.Fatal("Could not find the current user")
+	}
+	authProvider := authInfo.AuthProvider
+	if authProvider == nil {
+		log.Fatal("auth-provider is not set in the config")
+	}
+
+	switch authProvider.Name {
+	case "oidc":
+		if err := mutateConfigWithOIDC(authProvider); err != nil {
+			log.Fatal(err)
+		}
+		WriteKubeConfig(*kubeConfig, kubeConfigPath)
+		log.Printf("Updated %s", kubeConfigPath)
+
+	default:
+		log.Fatalf("Currently auth-provider `%s` is not supported", authProvider.Name)
+	}
+}
+
+func mutateConfigWithOIDC(authProvider *api.AuthProviderConfig) error {
+	issuer := authProvider.Config["idp-issuer-url"]
+	clientID := authProvider.Config["client-id"]
+	clientSecret := authProvider.Config["client-secret"]
+	log.Printf("Using issuer: %s", issuer)
+	log.Printf("Using client ID: %s", clientID)
+	oidcToken, err := GetOIDCToken(issuer, clientID, clientSecret)
+	if err != nil {
+		return err
+	}
+	authProvider.Config["id-token"] = oidcToken.IDToken
+	authProvider.Config["refresh-token"] = oidcToken.RefreshToken
+	return nil
 }
--- a/oidc.go
+++ b/oidc.go
@@ -0,0 +1,130 @@
+package main
+
+import (
+	"context"
+	"crypto/rand"
+	"encoding/binary"
+	"fmt"
+	"log"
+
+	"github.com/coreos/go-oidc"
+	"golang.org/x/oauth2"
+)
+
+// OIDCToken is a token set
+type OIDCToken struct {
+	IDToken      string
+	RefreshToken string
+}
+
+// GetOIDCToken returns a token retrieved by auth code grant
+func GetOIDCToken(issuer string, clientID string, clientSecret string) (*OIDCToken, error) {
+	port := 8000
+	provider, err := oidc.NewProvider(oauth2.NoContext, issuer)
+	if err != nil {
+		return nil, err
+	}
+
+	state, err := generateState()
+	if err != nil {
+		return nil, err
+	}
+
+	webBrowserConfig := oauth2.Config{
+		ClientID:     clientID,
+		ClientSecret: clientSecret,
+		RedirectURL:  fmt.Sprintf("http://localhost:%d/", port),
+		Endpoint:     provider.Endpoint(),
+		Scopes:       []string{oidc.ScopeOpenID, "email"},
+	}
+
+	cliConfig := oauth2.Config{
+		ClientID:     clientID,
+		ClientSecret: clientSecret,
+		RedirectURL:  "urn:ietf:wg:oauth:2.0:oob",
+		Endpoint:     provider.Endpoint(),
+		Scopes:       []string{oidc.ScopeOpenID, "email"},
+	}
+
+	showInstructionToGetToken(webBrowserConfig.RedirectURL, cliConfig.AuthCodeURL(state))
+	token, err := getTokenByWebBrowserOrCLI(webBrowserConfig, cliConfig, state)
+	if err != nil {
+		return nil, err
+	}
+
+	rawIDToken, ok := token.Extra("id_token").(string)
+	if !ok {
+		return nil, fmt.Errorf("id_token is missing in the token response: %s", token)
+	}
+
+	log.Printf("Verifying ID token...")
+	verifier := provider.Verifier(&oidc.Config{ClientID: clientID})
+	idToken, err := verifier.Verify(oauth2.NoContext, rawIDToken)
+	if err != nil {
+		return nil, err
+	}
+
+	idTokenClaim := struct {
+		Email string `json:"email"`
+	}{}
+	if err := idToken.Claims(&idTokenClaim); err != nil {
+		return nil, err
+	}
+
+	log.Printf("You are logged in as %s (%s)", idTokenClaim.Email, idToken.Subject)
+	return &OIDCToken{
+		IDToken:      rawIDToken,
+		RefreshToken: token.RefreshToken,
+	}, nil
+}
+
+func getTokenByWebBrowserOrCLI(webBrowserConfig oauth2.Config, cliConfig oauth2.Config, state string) (*oauth2.Token, error) {
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+
+	webBrowserAuthCodeCh := make(chan string)
+	cliAuthCodeCh := make(chan string)
+	errCh := make(chan error)
+
+	go ReceiveAuthCodeFromWebBrowser(ctx, webBrowserConfig.AuthCodeURL(state), state, webBrowserAuthCodeCh, errCh)
+	go ReceiveAuthCodeFromCLI(ctx, cliAuthCodeCh, errCh)
+
+	select {
+	case err := <-errCh:
+		return nil, err
+
+	case authCode := <-webBrowserAuthCodeCh:
+		log.Printf("Exchanging code and token...")
+		return webBrowserConfig.Exchange(ctx, authCode)
+
+	case authCode := <-cliAuthCodeCh:
+		log.Printf("Exchanging code and token...")
+		return cliConfig.Exchange(ctx, authCode)
+	}
+}
+
+func showInstructionToGetToken(localhostURL string, cliAuthCodeURL string) {
+	log.Printf("Starting OpenID Connect authentication:")
+	fmt.Printf(`
+## Automatic (recommended)
+
+Open the following URL in the web browser:
+
+%s
+
+## Manual
+
+If you cannot access to localhost, instead open the following URL:
+
+%s
+
+Enter the code: `, localhostURL, cliAuthCodeURL)
+}
+
+func generateState() (string, error) {
+	var n uint64
+	if err := binary.Read(rand.Reader, binary.LittleEndian, &n); err != nil {
+		return "", err
+	}
+	return fmt.Sprintf("%x", n), nil
+}
--- a/oidc_cli.go
+++ b/oidc_cli.go
@@ -0,0 +1,16 @@
+package main
+
+import (
+	"context"
+	"fmt"
+)
+
+// ReceiveAuthCodeFromCLI receives an auth code from CLI
+func ReceiveAuthCodeFromCLI(ctx context.Context, authCodeCh chan<- string, errCh chan<- error) {
+	var authCode string
+	if _, err := fmt.Scanln(&authCode); err != nil {
+		errCh <- err
+	} else {
+		authCodeCh <- authCode
+	}
+}
--- a/oidc_http.go
+++ b/oidc_http.go
@@ -0,0 +1,70 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"net/http"
+)
+
+// ReceiveAuthCodeFromWebBrowser starts a server and receives an auth code
+func ReceiveAuthCodeFromWebBrowser(ctx context.Context, authCodeURL string, state string, authCodeCh chan<- string, errCh chan<- error) {
+	server := http.Server{
+		Addr: ":8000",
+		Handler: &AuthCodeGrantHandler{
+			AuthCodeURL: authCodeURL,
+			State:       state,
+			Resolve:     func(authCode string) { authCodeCh <- authCode },
+			Reject:      func(err error) { errCh <- err },
+		},
+	}
+
+	go func() {
+		if err := server.ListenAndServe(); err != nil && err != http.ErrServerClosed {
+			errCh <- err
+		}
+	}()
+
+	select {
+	case <-ctx.Done():
+		server.Shutdown(context.Background())
+	}
+}
+
+// AuthCodeGrantHandler handles requests for OIDC auth code grant
+type AuthCodeGrantHandler struct {
+	AuthCodeURL string
+	State       string
+	Resolve     func(string)
+	Reject      func(error)
+}
+
+func (s *AuthCodeGrantHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	log.Printf("%s %s", r.Method, r.RequestURI)
+	switch r.URL.Path {
+	case "/":
+		code := r.URL.Query().Get("code")
+		state := r.URL.Query().Get("state")
+		errorCode := r.URL.Query().Get("error")
+		errorDescription := r.URL.Query().Get("error_description")
+		switch {
+		case code != "" && state == s.State:
+			s.Resolve(code)
+			fmt.Fprintf(w, "Please back to the command line.")
+
+		case code != "" && state != s.State:
+			s.Reject(fmt.Errorf("OIDC state did not match. expected=%s, actual=%s", s.State, state))
+			fmt.Fprintf(w, "Please back to the command line.")
+
+		case errorCode != "":
+			s.Reject(fmt.Errorf("OIDC error: %s %s", errorCode, errorDescription))
+			fmt.Fprintf(w, "Please back to the command line.")
+
+		default:
+			http.Redirect(w, r, s.AuthCodeURL, 302)
+		}
+
+	default:
+		http.Error(w, "Not Found", 404)
+	}
+}
--- a/pkg/cmd/authentication.go
+++ b/pkg/cmd/authentication.go
@@ -1,109 +0,0 @@
-package cmd
-
-import (
-	"fmt"
-	"strings"
-	"time"
-
-	"github.com/int128/kubelogin/pkg/usecases/authentication"
-	"github.com/int128/kubelogin/pkg/usecases/authentication/authcode"
-	"github.com/int128/kubelogin/pkg/usecases/authentication/ropc"
-	"github.com/spf13/pflag"
-)
-
-type authenticationOptions struct {
-	GrantType                  string
-	ListenAddress              []string
-	ListenPort                 []int // deprecated
-	AuthenticationTimeoutSec   int
-	SkipOpenBrowser            bool
-	LocalServerCertFile        string
-	LocalServerKeyFile         string
-	OpenURLAfterAuthentication string
-	RedirectURLHostname        string
-	AuthRequestExtraParams     map[string]string
-	Username                   string
-	Password                   string
-}
-
-// determineListenAddress returns the addresses from the flags.
-// Note that --listen-address is always given due to the default value.
-// If --listen-port is not set, it returns --listen-address.
-// If --listen-port is set, it returns the strings of --listen-port.
-func (o *authenticationOptions) determineListenAddress() []string {
-	if len(o.ListenPort) == 0 {
-		return o.ListenAddress
-	}
-	var a []string
-	for _, p := range o.ListenPort {
-		a = append(a, fmt.Sprintf("127.0.0.1:%d", p))
-	}
-	return a
-}
-
-var allGrantType = strings.Join([]string{
-	"auto",
-	"authcode",
-	"authcode-keyboard",
-	"password",
-}, "|")
-
-func (o *authenticationOptions) addFlags(f *pflag.FlagSet) {
-	f.StringVar(&o.GrantType, "grant-type", "auto", fmt.Sprintf("Authorization grant type to use. One of (%s)", allGrantType))
-	f.StringSliceVar(&o.ListenAddress, "listen-address", defaultListenAddress, "[authcode] Address to bind to the local server. If multiple addresses are set, it will try binding in order")
-	//TODO: remove the deprecated flag
-	f.IntSliceVar(&o.ListenPort, "listen-port", nil, "[authcode] deprecated: port to bind to the local server")
-	if err := f.MarkDeprecated("listen-port", "use --listen-address instead"); err != nil {
-		panic(err)
-	}
-	f.BoolVar(&o.SkipOpenBrowser, "skip-open-browser", false, "[authcode] Do not open the browser automatically")
-	f.IntVar(&o.AuthenticationTimeoutSec, "authentication-timeout-sec", defaultAuthenticationTimeoutSec, "[authcode] Timeout of authentication in seconds")
-	f.StringVar(&o.LocalServerCertFile, "local-server-cert", "", "[authcode] Certificate path for the local server")
-	f.StringVar(&o.LocalServerKeyFile, "local-server-key", "", "[authcode] Certificate key path for the local server")
-	f.StringVar(&o.OpenURLAfterAuthentication, "open-url-after-authentication", "", "[authcode] If set, open the URL in the browser after authentication")
-	f.StringVar(&o.RedirectURLHostname, "oidc-redirect-url-hostname", "localhost", "[authcode] Hostname of the redirect URL")
-	f.StringToStringVar(&o.AuthRequestExtraParams, "oidc-auth-request-extra-params", nil, "[authcode, authcode-keyboard] Extra query parameters to send with an authentication request")
-	f.StringVar(&o.Username, "username", "", "[password] Username for resource owner password credentials grant")
-	f.StringVar(&o.Password, "password", "", "[password] Password for resource owner password credentials grant")
-}
-
-func (o *authenticationOptions) expandHomedir() error {
-	var err error
-	o.LocalServerCertFile, err = expandHomedir(o.LocalServerCertFile)
-	if err != nil {
-		return fmt.Errorf("invalid --local-server-cert: %w", err)
-	}
-	o.LocalServerKeyFile, err = expandHomedir(o.LocalServerKeyFile)
-	if err != nil {
-		return fmt.Errorf("invalid --local-server-key: %w", err)
-	}
-	return nil
-}
-
-func (o *authenticationOptions) grantOptionSet() (s authentication.GrantOptionSet, err error) {
-	switch {
-	case o.GrantType == "authcode" || (o.GrantType == "auto" && o.Username == ""):
-		s.AuthCodeBrowserOption = &authcode.BrowserOption{
-			BindAddress:                o.determineListenAddress(),
-			SkipOpenBrowser:            o.SkipOpenBrowser,
-			AuthenticationTimeout:      time.Duration(o.AuthenticationTimeoutSec) * time.Second,
-			LocalServerCertFile:        o.LocalServerCertFile,
-			LocalServerKeyFile:         o.LocalServerKeyFile,
-			OpenURLAfterAuthentication: o.OpenURLAfterAuthentication,
-			RedirectURLHostname:        o.RedirectURLHostname,
-			AuthRequestExtraParams:     o.AuthRequestExtraParams,
-		}
-	case o.GrantType == "authcode-keyboard":
-		s.AuthCodeKeyboardOption = &authcode.KeyboardOption{
-			AuthRequestExtraParams: o.AuthRequestExtraParams,
-		}
-	case o.GrantType == "password" || (o.GrantType == "auto" && o.Username != ""):
-		s.ROPCOption = &ropc.Option{
-			Username: o.Username,
-			Password: o.Password,
-		}
-	default:
-		err = fmt.Errorf("grant-type must be one of (%s)", allGrantType)
-	}
-	return
-}
--- a/pkg/cmd/authentication_test.go
+++ b/pkg/cmd/authentication_test.go
@@ -1,141 +0,0 @@
-package cmd
-
-import (
-	"testing"
-	"time"
-
-	"github.com/google/go-cmp/cmp"
-	"github.com/int128/kubelogin/pkg/usecases/authentication"
-	"github.com/int128/kubelogin/pkg/usecases/authentication/authcode"
-	"github.com/int128/kubelogin/pkg/usecases/authentication/ropc"
-	"github.com/spf13/pflag"
-)
-
-func Test_authenticationOptions_grantOptionSet(t *testing.T) {
-	tests := map[string]struct {
-		args []string
-		want authentication.GrantOptionSet
-	}{
-		"NoFlag": {
-			want: authentication.GrantOptionSet{
-				AuthCodeBrowserOption: &authcode.BrowserOption{
-					BindAddress:           defaultListenAddress,
-					AuthenticationTimeout: defaultAuthenticationTimeoutSec * time.Second,
-					RedirectURLHostname:   "localhost",
-				},
-			},
-		},
-		"FullOptions": {
-			args: []string{
-				"--grant-type", "authcode",
-				"--listen-address", "127.0.0.1:10080",
-				"--listen-address", "127.0.0.1:20080",
-				"--skip-open-browser",
-				"--authentication-timeout-sec", "10",
-				"--local-server-cert", "/path/to/local-server-cert",
-				"--local-server-key", "/path/to/local-server-key",
-				"--open-url-after-authentication", "https://example.com/success.html",
-				"--oidc-redirect-url-hostname", "example",
-				"--oidc-auth-request-extra-params", "ttl=86400",
-				"--oidc-auth-request-extra-params", "reauth=true",
-				"--username", "USER",
-				"--password", "PASS",
-			},
-			want: authentication.GrantOptionSet{
-				AuthCodeBrowserOption: &authcode.BrowserOption{
-					BindAddress:                []string{"127.0.0.1:10080", "127.0.0.1:20080"},
-					SkipOpenBrowser:            true,
-					AuthenticationTimeout:      10 * time.Second,
-					LocalServerCertFile:        "/path/to/local-server-cert",
-					LocalServerKeyFile:         "/path/to/local-server-key",
-					OpenURLAfterAuthentication: "https://example.com/success.html",
-					RedirectURLHostname:        "example",
-					AuthRequestExtraParams:     map[string]string{"ttl": "86400", "reauth": "true"},
-				},
-			},
-		},
-		"when --listen-port is set, it should convert the port to address": {
-			args: []string{
-				"--listen-port", "10080",
-				"--listen-port", "20080",
-			},
-			want: authentication.GrantOptionSet{
-				AuthCodeBrowserOption: &authcode.BrowserOption{
-					BindAddress:           []string{"127.0.0.1:10080", "127.0.0.1:20080"},
-					AuthenticationTimeout: defaultAuthenticationTimeoutSec * time.Second,
-					RedirectURLHostname:   "localhost",
-				},
-			},
-		},
-		"when --listen-port is set, it should ignore --listen-address flags": {
-			args: []string{
-				"--listen-port", "10080",
-				"--listen-port", "20080",
-				"--listen-address", "127.0.0.1:30080",
-				"--listen-address", "127.0.0.1:40080",
-			},
-			want: authentication.GrantOptionSet{
-				AuthCodeBrowserOption: &authcode.BrowserOption{
-					BindAddress:           []string{"127.0.0.1:10080", "127.0.0.1:20080"},
-					AuthenticationTimeout: defaultAuthenticationTimeoutSec * time.Second,
-					RedirectURLHostname:   "localhost",
-				},
-			},
-		},
-		"GrantType=authcode-keyboard": {
-			args: []string{
-				"--grant-type", "authcode-keyboard",
-			},
-			want: authentication.GrantOptionSet{
-				AuthCodeKeyboardOption: &authcode.KeyboardOption{},
-			},
-		},
-		"GrantType=password": {
-			args: []string{
-				"--grant-type", "password",
-				"--listen-address", "127.0.0.1:10080",
-				"--listen-address", "127.0.0.1:20080",
-				"--username", "USER",
-				"--password", "PASS",
-			},
-			want: authentication.GrantOptionSet{
-				ROPCOption: &ropc.Option{
-					Username: "USER",
-					Password: "PASS",
-				},
-			},
-		},
-		"GrantType=auto": {
-			args: []string{
-				"--listen-address", "127.0.0.1:10080",
-				"--listen-address", "127.0.0.1:20080",
-				"--username", "USER",
-				"--password", "PASS",
-			},
-			want: authentication.GrantOptionSet{
-				ROPCOption: &ropc.Option{
-					Username: "USER",
-					Password: "PASS",
-				},
-			},
-		},
-	}
-
-	for name, c := range tests {
-		t.Run(name, func(t *testing.T) {
-			var o authenticationOptions
-			f := pflag.NewFlagSet("", pflag.ContinueOnError)
-			o.addFlags(f)
-			if err := f.Parse(c.args); err != nil {
-				t.Fatalf("Parse error: %s", err)
-			}
-			got, err := o.grantOptionSet()
-			if err != nil {
-				t.Fatalf("grantOptionSet error: %s", err)
-			}
-			if diff := cmp.Diff(c.want, got); diff != "" {
-				t.Errorf("mismatch (-want +got):\n%s", diff)
-			}
-		})
-	}
-}
--- a/pkg/cmd/cmd.go
+++ b/pkg/cmd/cmd.go
@@ -1,69 +0,0 @@
-package cmd
-
-import (
-	"context"
-	"runtime"
-
-	"github.com/google/wire"
-	"github.com/int128/kubelogin/pkg/infrastructure/logger"
-	"github.com/spf13/cobra"
-)
-
-// 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 = "~/.kube/cache/oidc-login"
-
-const defaultAuthenticationTimeoutSec = 180
-
-// Cmd provides interaction with command line interface (CLI).
-type Cmd struct {
-	Root     *Root
-	GetToken *GetToken
-	Setup    *Setup
-	Logger   logger.Interface
-}
-
-// Run parses the command line arguments and executes the specified use-case.
-// It returns an exit code, that is 0 on success or 1 on error.
-func (cmd *Cmd) Run(ctx context.Context, args []string, version string) int {
-	rootCmd := cmd.Root.New()
-	rootCmd.Version = version
-	rootCmd.SilenceUsage = true
-	rootCmd.SilenceErrors = true
-
-	getTokenCmd := cmd.GetToken.New()
-	rootCmd.AddCommand(getTokenCmd)
-
-	setupCmd := cmd.Setup.New()
-	rootCmd.AddCommand(setupCmd)
-
-	versionCmd := &cobra.Command{
-		Use:   "version",
-		Short: "Print the version information",
-		Args:  cobra.NoArgs,
-		Run: func(*cobra.Command, []string) {
-			cmd.Logger.Printf("kubelogin version %s (%s %s_%s)", version, runtime.Version(), runtime.GOOS, runtime.GOARCH)
-		},
-	}
-	rootCmd.AddCommand(versionCmd)
-
-	rootCmd.SetArgs(args[1:])
-	if err := rootCmd.ExecuteContext(ctx); err != nil {
-		cmd.Logger.Printf("error: %s", err)
-		cmd.Logger.V(1).Infof("stacktrace: %+v", err)
-		return 1
-	}
-	return 0
-}
--- a/pkg/cmd/cmd_test.go
+++ b/pkg/cmd/cmd_test.go
@@ -1,256 +0,0 @@
-package cmd
-
-import (
-	"context"
-	"os"
-	"testing"
-	"time"
-
-	"github.com/golang/mock/gomock"
-	"github.com/int128/kubelogin/pkg/oidc"
-	"github.com/int128/kubelogin/pkg/testing/logger"
-	"github.com/int128/kubelogin/pkg/tlsclientconfig"
-	"github.com/int128/kubelogin/pkg/usecases/authentication"
-	"github.com/int128/kubelogin/pkg/usecases/authentication/authcode"
-	"github.com/int128/kubelogin/pkg/usecases/credentialplugin"
-	"github.com/int128/kubelogin/pkg/usecases/credentialplugin/mock_credentialplugin"
-	"github.com/int128/kubelogin/pkg/usecases/standalone"
-	"github.com/int128/kubelogin/pkg/usecases/standalone/mock_standalone"
-)
-
-func TestCmd_Run(t *testing.T) {
-	const executable = "kubelogin"
-	const version = "HEAD"
-
-	t.Run("root", func(t *testing.T) {
-		tests := map[string]struct {
-			args []string
-			in   standalone.Input
-		}{
-			"Defaults": {
-				args: []string{executable},
-				in: standalone.Input{
-					GrantOptionSet: authentication.GrantOptionSet{
-						AuthCodeBrowserOption: &authcode.BrowserOption{
-							BindAddress:           defaultListenAddress,
-							AuthenticationTimeout: defaultAuthenticationTimeoutSec * time.Second,
-							RedirectURLHostname:   "localhost",
-						},
-					},
-				},
-			},
-			"FullOptions": {
-				args: []string{executable,
-					"--kubeconfig", "/path/to/kubeconfig",
-					"--context", "hello.k8s.local",
-					"--user", "google",
-					"-v1",
-				},
-				in: standalone.Input{
-					KubeconfigFilename: "/path/to/kubeconfig",
-					KubeconfigContext:  "hello.k8s.local",
-					KubeconfigUser:     "google",
-					GrantOptionSet: authentication.GrantOptionSet{
-						AuthCodeBrowserOption: &authcode.BrowserOption{
-							BindAddress:           defaultListenAddress,
-							AuthenticationTimeout: defaultAuthenticationTimeoutSec * time.Second,
-							RedirectURLHostname:   "localhost",
-						},
-					},
-				},
-			},
-		}
-		for name, c := range tests {
-			t.Run(name, func(t *testing.T) {
-				ctrl := gomock.NewController(t)
-				defer ctrl.Finish()
-				ctx := context.TODO()
-				mockStandalone := mock_standalone.NewMockInterface(ctrl)
-				mockStandalone.EXPECT().
-					Do(ctx, c.in)
-				cmd := Cmd{
-					Root: &Root{
-						Standalone: mockStandalone,
-						Logger:     logger.New(t),
-					},
-					Logger: logger.New(t),
-				}
-				exitCode := cmd.Run(ctx, c.args, version)
-				if exitCode != 0 {
-					t.Errorf("exitCode wants 0 but %d", exitCode)
-				}
-			})
-		}
-
-		t.Run("TooManyArgs", func(t *testing.T) {
-			ctrl := gomock.NewController(t)
-			defer ctrl.Finish()
-			cmd := Cmd{
-				Root: &Root{
-					Standalone: mock_standalone.NewMockInterface(ctrl),
-					Logger:     logger.New(t),
-				},
-				Logger: logger.New(t),
-			}
-			exitCode := cmd.Run(context.TODO(), []string{executable, "some"}, version)
-			if exitCode != 1 {
-				t.Errorf("exitCode wants 1 but %d", exitCode)
-			}
-		})
-	})
-
-	t.Run("get-token", func(t *testing.T) {
-		userHomeDir, err := os.UserHomeDir()
-		if err != nil {
-			t.Fatalf("os.UserHomeDir error: %s", err)
-		}
-
-		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: userHomeDir + "/.kube/cache/oidc-login",
-					Provider: oidc.Provider{
-						IssuerURL: "https://issuer.example.com",
-						ClientID:  "YOUR_CLIENT_ID",
-					},
-					GrantOptionSet: authentication.GrantOptionSet{
-						AuthCodeBrowserOption: &authcode.BrowserOption{
-							BindAddress:           defaultListenAddress,
-							AuthenticationTimeout: defaultAuthenticationTimeoutSec * time.Second,
-							RedirectURLHostname:   "localhost",
-						},
-					},
-				},
-			},
-			"FullOptions": {
-				args: []string{executable,
-					"get-token",
-					"--oidc-issuer-url", "https://issuer.example.com",
-					"--oidc-client-id", "YOUR_CLIENT_ID",
-					"--oidc-client-secret", "YOUR_CLIENT_SECRET",
-					"--oidc-extra-scope", "email",
-					"--oidc-extra-scope", "profile",
-					"-v1",
-				},
-				in: credentialplugin.Input{
-					TokenCacheDir: userHomeDir + "/.kube/cache/oidc-login",
-					Provider: oidc.Provider{
-						IssuerURL:    "https://issuer.example.com",
-						ClientID:     "YOUR_CLIENT_ID",
-						ClientSecret: "YOUR_CLIENT_SECRET",
-						ExtraScopes:  []string{"email", "profile"},
-					},
-					GrantOptionSet: authentication.GrantOptionSet{
-						AuthCodeBrowserOption: &authcode.BrowserOption{
-							BindAddress:           defaultListenAddress,
-							AuthenticationTimeout: defaultAuthenticationTimeoutSec * time.Second,
-							RedirectURLHostname:   "localhost",
-						},
-					},
-				},
-			},
-			"HomedirExpansion": {
-				args: []string{executable,
-					"get-token",
-					"--oidc-issuer-url", "https://issuer.example.com",
-					"--oidc-client-id", "YOUR_CLIENT_ID",
-					"--certificate-authority", "~/.kube/ca.crt",
-					"--local-server-cert", "~/.kube/oidc-server.crt",
-					"--local-server-key", "~/.kube/oidc-server.key",
-					"--token-cache-dir", "~/.kube/oidc-cache",
-				},
-				in: credentialplugin.Input{
-					TokenCacheDir: userHomeDir + "/.kube/oidc-cache",
-					Provider: oidc.Provider{
-						IssuerURL: "https://issuer.example.com",
-						ClientID:  "YOUR_CLIENT_ID",
-					},
-					GrantOptionSet: authentication.GrantOptionSet{
-						AuthCodeBrowserOption: &authcode.BrowserOption{
-							BindAddress:           defaultListenAddress,
-							AuthenticationTimeout: defaultAuthenticationTimeoutSec * time.Second,
-							RedirectURLHostname:   "localhost",
-							LocalServerCertFile:   userHomeDir + "/.kube/oidc-server.crt",
-							LocalServerKeyFile:    userHomeDir + "/.kube/oidc-server.key",
-						},
-					},
-					TLSClientConfig: tlsclientconfig.Config{
-						CACertFilename: []string{userHomeDir + "/.kube/ca.crt"},
-					},
-				},
-			},
-		}
-		for name, c := range tests {
-			t.Run(name, func(t *testing.T) {
-				ctrl := gomock.NewController(t)
-				defer ctrl.Finish()
-				ctx := context.TODO()
-				getToken := mock_credentialplugin.NewMockInterface(ctrl)
-				getToken.EXPECT().
-					Do(ctx, c.in)
-				cmd := Cmd{
-					Root: &Root{
-						Logger: logger.New(t),
-					},
-					GetToken: &GetToken{
-						GetToken: getToken,
-						Logger:   logger.New(t),
-					},
-					Logger: logger.New(t),
-				}
-				exitCode := cmd.Run(ctx, c.args, version)
-				if exitCode != 0 {
-					t.Errorf("exitCode wants 0 but %d", exitCode)
-				}
-			})
-		}
-
-		t.Run("MissingMandatoryOptions", func(t *testing.T) {
-			ctrl := gomock.NewController(t)
-			defer ctrl.Finish()
-			ctx := context.TODO()
-			cmd := Cmd{
-				Root: &Root{
-					Logger: logger.New(t),
-				},
-				GetToken: &GetToken{
-					GetToken: mock_credentialplugin.NewMockInterface(ctrl),
-					Logger:   logger.New(t),
-				},
-				Logger: logger.New(t),
-			}
-			exitCode := cmd.Run(ctx, []string{executable, "get-token"}, version)
-			if exitCode != 1 {
-				t.Errorf("exitCode wants 1 but %d", exitCode)
-			}
-		})
-
-		t.Run("TooManyArgs", func(t *testing.T) {
-			ctrl := gomock.NewController(t)
-			defer ctrl.Finish()
-			ctx := context.TODO()
-			cmd := Cmd{
-				Root: &Root{
-					Logger: logger.New(t),
-				},
-				GetToken: &GetToken{
-					GetToken: mock_credentialplugin.NewMockInterface(ctrl),
-					Logger:   logger.New(t),
-				},
-				Logger: logger.New(t),
-			}
-			exitCode := cmd.Run(ctx, []string{executable, "get-token", "foo"}, version)
-			if exitCode != 1 {
-				t.Errorf("exitCode wants 1 but %d", exitCode)
-			}
-		})
-	})
-}
--- a/pkg/cmd/get_token.go
+++ b/pkg/cmd/get_token.go
@@ -1,113 +0,0 @@
-package cmd
-
-import (
-	"errors"
-	"fmt"
-	"os"
-	"strings"
-
-	"github.com/int128/kubelogin/pkg/infrastructure/logger"
-	"github.com/int128/kubelogin/pkg/oidc"
-	"github.com/int128/kubelogin/pkg/usecases/credentialplugin"
-	"github.com/spf13/cobra"
-	"github.com/spf13/pflag"
-)
-
-// getTokenOptions represents the options for get-token command.
-type getTokenOptions struct {
-	IssuerURL             string
-	ClientID              string
-	ClientSecret          string
-	ExtraScopes           []string
-	TokenCacheDir         string
-	tlsOptions            tlsOptions
-	authenticationOptions authenticationOptions
-}
-
-func (o *getTokenOptions) addFlags(f *pflag.FlagSet) {
-	f.StringVar(&o.IssuerURL, "oidc-issuer-url", "", "Issuer URL of the provider (mandatory)")
-	f.StringVar(&o.ClientID, "oidc-client-id", "", "Client ID of the provider (mandatory)")
-	f.StringVar(&o.ClientSecret, "oidc-client-secret", "", "Client secret of the provider")
-	f.StringSliceVar(&o.ExtraScopes, "oidc-extra-scope", nil, "Scopes to request to the provider")
-	f.StringVar(&o.TokenCacheDir, "token-cache-dir", defaultTokenCacheDir, "Path to a directory for token cache")
-	o.tlsOptions.addFlags(f)
-	o.authenticationOptions.addFlags(f)
-}
-
-func (o *getTokenOptions) expandHomedir() error {
-	var err error
-	o.TokenCacheDir, err = expandHomedir(o.TokenCacheDir)
-	if err != nil {
-		return fmt.Errorf("invalid --token-cache-dir: %w", err)
-	}
-	if err = o.authenticationOptions.expandHomedir(); err != nil {
-		return err
-	}
-	if err = o.tlsOptions.expandHomedir(); err != nil {
-		return err
-	}
-	return nil
-}
-
-type GetToken struct {
-	GetToken credentialplugin.Interface
-	Logger   logger.Interface
-}
-
-func (cmd *GetToken) New() *cobra.Command {
-	var o getTokenOptions
-	c := &cobra.Command{
-		Use:   "get-token [flags]",
-		Short: "Run as a kubectl credential plugin",
-		Args: func(c *cobra.Command, args []string) error {
-			if err := cobra.NoArgs(c, args); err != nil {
-				return err
-			}
-			if o.IssuerURL == "" {
-				return errors.New("--oidc-issuer-url is missing")
-			}
-			if o.ClientID == "" {
-				return errors.New("--oidc-client-id is missing")
-			}
-			return nil
-		},
-		RunE: func(c *cobra.Command, _ []string) error {
-			if err := o.expandHomedir(); err != nil {
-				return err
-			}
-			grantOptionSet, err := o.authenticationOptions.grantOptionSet()
-			if err != nil {
-				return fmt.Errorf("get-token: %w", err)
-			}
-			in := credentialplugin.Input{
-				Provider: oidc.Provider{
-					IssuerURL:    o.IssuerURL,
-					ClientID:     o.ClientID,
-					ClientSecret: o.ClientSecret,
-					ExtraScopes:  o.ExtraScopes,
-				},
-				TokenCacheDir:   o.TokenCacheDir,
-				GrantOptionSet:  grantOptionSet,
-				TLSClientConfig: o.tlsOptions.tlsClientConfig(),
-			}
-			if err := cmd.GetToken.Do(c.Context(), in); err != nil {
-				return fmt.Errorf("get-token: %w", err)
-			}
-			return nil
-		},
-	}
-	c.Flags().SortFlags = false
-	o.addFlags(c.Flags())
-	return c
-}
-
-func expandHomedir(s string) (string, error) {
-	if !strings.HasPrefix(s, "~"+string(os.PathSeparator)) {
-		return s, nil
-	}
-	userHomeDir, err := os.UserHomeDir()
-	if err != nil {
-		return "", fmt.Errorf("could not expand homedir: %w", err)
-	}
-	return userHomeDir + strings.TrimPrefix(s, "~"), nil
-}
--- a/pkg/cmd/root.go
+++ b/pkg/cmd/root.go
@@ -1,73 +0,0 @@
-package cmd
-
-import (
-	"fmt"
-	"github.com/int128/kubelogin/pkg/infrastructure/logger"
-	"github.com/int128/kubelogin/pkg/kubeconfig"
-	"github.com/int128/kubelogin/pkg/usecases/standalone"
-	"github.com/spf13/cobra"
-	"github.com/spf13/pflag"
-)
-
-const rootDescription = `Log in to the OpenID Connect provider.
-
-You need to set up the OIDC provider, role binding, Kubernetes API server and kubeconfig.
-To show the setup instruction:
-
-	kubectl oidc-login setup
-
-See https://github.com/int128/kubelogin for more.
-`
-
-// rootOptions represents the options for the root command.
-type rootOptions struct {
-	Kubeconfig            string
-	Context               string
-	User                  string
-	tlsOptions            tlsOptions
-	authenticationOptions authenticationOptions
-}
-
-func (o *rootOptions) addFlags(f *pflag.FlagSet) {
-	f.StringVar(&o.Kubeconfig, "kubeconfig", "", "Path to the kubeconfig file")
-	f.StringVar(&o.Context, "context", "", "Name of the kubeconfig context to use")
-	f.StringVar(&o.User, "user", "", "Name of the kubeconfig user to use. Prior to --context")
-	o.tlsOptions.addFlags(f)
-	o.authenticationOptions.addFlags(f)
-}
-
-type Root struct {
-	Standalone standalone.Interface
-	Logger     logger.Interface
-}
-
-func (cmd *Root) New() *cobra.Command {
-	var o rootOptions
-	c := &cobra.Command{
-		Use:   "kubelogin",
-		Short: "Log in to the OpenID Connect provider",
-		Long:  rootDescription,
-		Args:  cobra.NoArgs,
-		RunE: func(c *cobra.Command, _ []string) error {
-			grantOptionSet, err := o.authenticationOptions.grantOptionSet()
-			if err != nil {
-				return fmt.Errorf("invalid option: %w", err)
-			}
-			in := standalone.Input{
-				KubeconfigFilename: o.Kubeconfig,
-				KubeconfigContext:  kubeconfig.ContextName(o.Context),
-				KubeconfigUser:     kubeconfig.UserName(o.User),
-				GrantOptionSet:     grantOptionSet,
-				TLSClientConfig:    o.tlsOptions.tlsClientConfig(),
-			}
-			if err := cmd.Standalone.Do(c.Context(), in); err != nil {
-				return fmt.Errorf("login: %w", err)
-			}
-			return nil
-		},
-	}
-	c.Flags().SortFlags = false
-	o.addFlags(c.Flags())
-	cmd.Logger.AddFlags(c.PersistentFlags())
-	return c
-}
--- a/pkg/cmd/setup.go
+++ b/pkg/cmd/setup.go
@@ -1,68 +0,0 @@
-package cmd
-
-import (
-	"fmt"
-	"github.com/int128/kubelogin/pkg/usecases/setup"
-	"github.com/spf13/cobra"
-	"github.com/spf13/pflag"
-)
-
-// setupOptions represents the options for setup command.
-type setupOptions struct {
-	IssuerURL             string
-	ClientID              string
-	ClientSecret          string
-	ExtraScopes           []string
-	tlsOptions            tlsOptions
-	authenticationOptions authenticationOptions
-}
-
-func (o *setupOptions) addFlags(f *pflag.FlagSet) {
-	f.StringVar(&o.IssuerURL, "oidc-issuer-url", "", "Issuer URL of the provider")
-	f.StringVar(&o.ClientID, "oidc-client-id", "", "Client ID of the provider")
-	f.StringVar(&o.ClientSecret, "oidc-client-secret", "", "Client secret of the provider")
-	f.StringSliceVar(&o.ExtraScopes, "oidc-extra-scope", nil, "Scopes to request to the provider")
-	o.tlsOptions.addFlags(f)
-	o.authenticationOptions.addFlags(f)
-}
-
-type Setup struct {
-	Setup setup.Interface
-}
-
-func (cmd *Setup) New() *cobra.Command {
-	var o setupOptions
-	c := &cobra.Command{
-		Use:   "setup",
-		Short: "Show the setup instruction",
-		Args:  cobra.NoArgs,
-		RunE: func(c *cobra.Command, _ []string) error {
-			grantOptionSet, err := o.authenticationOptions.grantOptionSet()
-			if err != nil {
-				return fmt.Errorf("setup: %w", err)
-			}
-			in := setup.Stage2Input{
-				IssuerURL:       o.IssuerURL,
-				ClientID:        o.ClientID,
-				ClientSecret:    o.ClientSecret,
-				ExtraScopes:     o.ExtraScopes,
-				GrantOptionSet:  grantOptionSet,
-				TLSClientConfig: o.tlsOptions.tlsClientConfig(),
-			}
-			if c.Flags().Lookup("listen-address").Changed {
-				in.ListenAddressArgs = o.authenticationOptions.ListenAddress
-			}
-			if in.IssuerURL == "" || in.ClientID == "" {
-				cmd.Setup.DoStage1()
-				return nil
-			}
-			if err := cmd.Setup.DoStage2(c.Context(), in); err != nil {
-				return fmt.Errorf("setup: %w", err)
-			}
-			return nil
-		},
-	}
-	c.Flags().SortFlags = false
-	o.addFlags(c.Flags())
-	return c
-}
--- a/pkg/cmd/tls.go
+++ b/pkg/cmd/tls.go
@@ -1,57 +0,0 @@
-package cmd
-
-import (
-	"crypto/tls"
-	"fmt"
-
-	"github.com/int128/kubelogin/pkg/tlsclientconfig"
-	"github.com/spf13/pflag"
-)
-
-type tlsOptions struct {
-	CACertFilename            []string
-	CACertData                []string
-	SkipTLSVerify             bool
-	RenegotiateOnceAsClient   bool
-	RenegotiateFreelyAsClient bool
-}
-
-func (o *tlsOptions) addFlags(f *pflag.FlagSet) {
-	f.StringArrayVar(&o.CACertFilename, "certificate-authority", nil, "Path to a cert file for the certificate authority")
-	f.StringArrayVar(&o.CACertData, "certificate-authority-data", nil, "Base64 encoded cert for the certificate authority")
-	f.BoolVar(&o.SkipTLSVerify, "insecure-skip-tls-verify", false, "If set, the server's certificate will not be checked for validity. This will make your HTTPS connections insecure")
-	f.BoolVar(&o.RenegotiateOnceAsClient, "tls-renegotiation-once", false, "If set, allow a remote server to request renegotiation once per connection")
-	f.BoolVar(&o.RenegotiateFreelyAsClient, "tls-renegotiation-freely", false, "If set, allow a remote server to repeatedly request renegotiation")
-}
-
-func (o *tlsOptions) expandHomedir() error {
-	var caCertFilenames []string
-	for _, caCertFilename := range o.CACertFilename {
-		expanded, err := expandHomedir(caCertFilename)
-		if err != nil {
-			return fmt.Errorf("invalid --certificate-authority: %w", err)
-		}
-		caCertFilenames = append(caCertFilenames, expanded)
-	}
-	o.CACertFilename = caCertFilenames
-	return nil
-}
-
-func (o tlsOptions) tlsClientConfig() tlsclientconfig.Config {
-	return tlsclientconfig.Config{
-		CACertFilename: o.CACertFilename,
-		CACertData:     o.CACertData,
-		SkipTLSVerify:  o.SkipTLSVerify,
-		Renegotiation:  o.renegotiationSupport(),
-	}
-}
-
-func (o tlsOptions) renegotiationSupport() tls.RenegotiationSupport {
-	if o.RenegotiateOnceAsClient {
-		return tls.RenegotiateOnceAsClient
-	}
-	if o.RenegotiateFreelyAsClient {
-		return tls.RenegotiateFreelyAsClient
-	}
-	return tls.RenegotiateNever
-}
--- a/pkg/cmd/tls_test.go
+++ b/pkg/cmd/tls_test.go
@@ -1,92 +0,0 @@
-package cmd
-
-import (
-	"crypto/tls"
-	"testing"
-
-	"github.com/google/go-cmp/cmp"
-	"github.com/int128/kubelogin/pkg/tlsclientconfig"
-	"github.com/spf13/pflag"
-)
-
-func Test_tlsOptions_tlsClientConfig(t *testing.T) {
-	tests := map[string]struct {
-		args []string
-		want tlsclientconfig.Config
-	}{
-		"NoFlag": {},
-		"SkipTLSVerify": {
-			args: []string{
-				"--insecure-skip-tls-verify",
-			},
-			want: tlsclientconfig.Config{
-				SkipTLSVerify: true,
-			},
-		},
-		"CACertFilename1": {
-			args: []string{
-				"--certificate-authority", "/path/to/cert1",
-			},
-			want: tlsclientconfig.Config{
-				CACertFilename: []string{"/path/to/cert1"},
-			},
-		},
-		"CACertFilename2": {
-			args: []string{
-				"--certificate-authority", "/path/to/cert1",
-				"--certificate-authority", "/path/to/cert2",
-			},
-			want: tlsclientconfig.Config{
-				CACertFilename: []string{"/path/to/cert1", "/path/to/cert2"},
-			},
-		},
-		"CACertData1": {
-			args: []string{
-				"--certificate-authority-data", "base64encoded1",
-			},
-			want: tlsclientconfig.Config{
-				CACertData: []string{"base64encoded1"},
-			},
-		},
-		"CACertData2": {
-			args: []string{
-				"--certificate-authority-data", "base64encoded1",
-				"--certificate-authority-data", "base64encoded2",
-			},
-			want: tlsclientconfig.Config{
-				CACertData: []string{"base64encoded1", "base64encoded2"},
-			},
-		},
-		"RenegotiateOnceAsClient": {
-			args: []string{
-				"--tls-renegotiation-once",
-			},
-			want: tlsclientconfig.Config{
-				Renegotiation: tls.RenegotiateOnceAsClient,
-			},
-		},
-		"RenegotiateFreelyAsClient": {
-			args: []string{
-				"--tls-renegotiation-freely",
-			},
-			want: tlsclientconfig.Config{
-				Renegotiation: tls.RenegotiateFreelyAsClient,
-			},
-		},
-	}
-
-	for name, c := range tests {
-		t.Run(name, func(t *testing.T) {
-			var o tlsOptions
-			f := pflag.NewFlagSet("", pflag.ContinueOnError)
-			o.addFlags(f)
-			if err := f.Parse(c.args); err != nil {
-				t.Fatalf("Parse error: %s", err)
-			}
-			got := o.tlsClientConfig()
-			if diff := cmp.Diff(c.want, got); diff != "" {
-				t.Errorf("mismatch (-want +got):\n%s", diff)
-			}
-		})
-	}
-}
--- a/pkg/credentialplugin/types.go
+++ b/pkg/credentialplugin/types.go
@@ -1,10 +0,0 @@
-// Package credentialplugin provides the types for client-go credential plugins.
-package credentialplugin
-
-import "time"
-
-// Output represents an output object of the credential plugin.
-type Output struct {
-	Token  string
-	Expiry time.Time
-}
--- a/pkg/credentialplugin/writer/credential_plugin.go
+++ b/pkg/credentialplugin/writer/credential_plugin.go
@@ -1,47 +0,0 @@
-// Package writer provides a writer for a credential plugin.
-package writer
-
-import (
-	"encoding/json"
-	"fmt"
-
-	"github.com/google/wire"
-	"github.com/int128/kubelogin/pkg/credentialplugin"
-	"github.com/int128/kubelogin/pkg/infrastructure/stdio"
-	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
-	clientauthenticationv1beta1 "k8s.io/client-go/pkg/apis/clientauthentication/v1beta1"
-)
-
-//go:generate mockgen -destination mock_writer/mock_writer.go github.com/int128/kubelogin/pkg/credentialplugin/writer Interface
-
-var Set = wire.NewSet(
-	wire.Struct(new(Writer), "*"),
-	wire.Bind(new(Interface), new(*Writer)),
-)
-
-type Interface interface {
-	Write(out credentialplugin.Output) error
-}
-
-type Writer struct {
-	Stdout stdio.Stdout
-}
-
-// Write writes the ExecCredential to standard output for kubectl.
-func (w *Writer) Write(out credentialplugin.Output) error {
-	ec := &clientauthenticationv1beta1.ExecCredential{
-		TypeMeta: metav1.TypeMeta{
-			APIVersion: "client.authentication.k8s.io/v1beta1",
-			Kind:       "ExecCredential",
-		},
-		Status: &clientauthenticationv1beta1.ExecCredentialStatus{
-			Token:               out.Token,
-			ExpirationTimestamp: &metav1.Time{Time: out.Expiry},
-		},
-	}
-	e := json.NewEncoder(w.Stdout)
-	if err := e.Encode(ec); err != nil {
-		return fmt.Errorf("could not write the ExecCredential: %w", err)
-	}
-	return nil
-}
--- a/pkg/credentialplugin/writer/mock_writer/mock_writer.go
+++ b/pkg/credentialplugin/writer/mock_writer/mock_writer.go
@@ -1,48 +0,0 @@
-// Code generated by MockGen. DO NOT EDIT.
-// Source: github.com/int128/kubelogin/pkg/credentialplugin/writer (interfaces: Interface)
-
-// Package mock_writer is a generated GoMock package.
-package mock_writer
-
-import (
-	gomock "github.com/golang/mock/gomock"
-	credentialplugin "github.com/int128/kubelogin/pkg/credentialplugin"
-	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 credentialplugin.Output) error {
-	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "Write", arg0)
-	ret0, _ := ret[0].(error)
-	return ret0
-}
-
-// Write indicates an expected call of Write
-func (mr *MockInterfaceMockRecorder) Write(arg0 interface{}) *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Write", reflect.TypeOf((*MockInterface)(nil).Write), arg0)
-}
--- a/pkg/di/di.go
+++ b/pkg/di/di.go
@@ -1,62 +0,0 @@
-//+build wireinject
-
-// Package di provides dependency injection.
-package di
-
-import (
-	"github.com/google/wire"
-	"github.com/int128/kubelogin/pkg/cmd"
-	"github.com/int128/kubelogin/pkg/credentialplugin/writer"
-	"github.com/int128/kubelogin/pkg/infrastructure/browser"
-	"github.com/int128/kubelogin/pkg/infrastructure/clock"
-	"github.com/int128/kubelogin/pkg/infrastructure/logger"
-	"github.com/int128/kubelogin/pkg/infrastructure/mutex"
-	"github.com/int128/kubelogin/pkg/infrastructure/reader"
-	"github.com/int128/kubelogin/pkg/infrastructure/stdio"
-	kubeconfigLoader "github.com/int128/kubelogin/pkg/kubeconfig/loader"
-	kubeconfigWriter "github.com/int128/kubelogin/pkg/kubeconfig/writer"
-	"github.com/int128/kubelogin/pkg/oidc/client"
-	"github.com/int128/kubelogin/pkg/tlsclientconfig/loader"
-	"github.com/int128/kubelogin/pkg/tokencache/repository"
-	"github.com/int128/kubelogin/pkg/usecases/authentication"
-	"github.com/int128/kubelogin/pkg/usecases/credentialplugin"
-	"github.com/int128/kubelogin/pkg/usecases/setup"
-	"github.com/int128/kubelogin/pkg/usecases/standalone"
-)
-
-// NewCmd returns an instance of infrastructure.Cmd.
-func NewCmd() cmd.Interface {
-	wire.Build(
-		NewCmdForHeadless,
-
-		// dependencies for production
-		clock.Set,
-		stdio.Set,
-		logger.Set,
-		browser.Set,
-	)
-	return nil
-}
-
-// NewCmdForHeadless returns an instance of infrastructure.Cmd for headless testing.
-func NewCmdForHeadless(clock.Interface, stdio.Stdin, stdio.Stdout, logger.Interface, browser.Interface) cmd.Interface {
-	wire.Build(
-		// use-cases
-		authentication.Set,
-		standalone.Set,
-		credentialplugin.Set,
-		setup.Set,
-
-		// infrastructure
-		cmd.Set,
-		reader.Set,
-		kubeconfigLoader.Set,
-		kubeconfigWriter.Set,
-		repository.Set,
-		client.Set,
-		loader.Set,
-		writer.Set,
-		mutex.Set,
-	)
-	return nil
-}
--- a/pkg/di/wire_gen.go
+++ b/pkg/di/wire_gen.go
@@ -1,122 +0,0 @@
-// Code generated by Wire. DO NOT EDIT.
-
-//go:generate wire
-//+build !wireinject
-
-package di
-
-import (
-	"github.com/int128/kubelogin/pkg/cmd"
-	writer2 "github.com/int128/kubelogin/pkg/credentialplugin/writer"
-	"github.com/int128/kubelogin/pkg/infrastructure/browser"
-	"github.com/int128/kubelogin/pkg/infrastructure/clock"
-	"github.com/int128/kubelogin/pkg/infrastructure/logger"
-	"github.com/int128/kubelogin/pkg/infrastructure/mutex"
-	"github.com/int128/kubelogin/pkg/infrastructure/reader"
-	"github.com/int128/kubelogin/pkg/infrastructure/stdio"
-	loader2 "github.com/int128/kubelogin/pkg/kubeconfig/loader"
-	"github.com/int128/kubelogin/pkg/kubeconfig/writer"
-	"github.com/int128/kubelogin/pkg/oidc/client"
-	"github.com/int128/kubelogin/pkg/tlsclientconfig/loader"
-	"github.com/int128/kubelogin/pkg/tokencache/repository"
-	"github.com/int128/kubelogin/pkg/usecases/authentication"
-	"github.com/int128/kubelogin/pkg/usecases/authentication/authcode"
-	"github.com/int128/kubelogin/pkg/usecases/authentication/ropc"
-	"github.com/int128/kubelogin/pkg/usecases/credentialplugin"
-	"github.com/int128/kubelogin/pkg/usecases/setup"
-	"github.com/int128/kubelogin/pkg/usecases/standalone"
-	"os"
-)
-
-// Injectors from di.go:
-
-func NewCmd() cmd.Interface {
-	clockReal := &clock.Real{}
-	stdin := _wireFileValue
-	stdout := _wireOsFileValue
-	loggerInterface := logger.New()
-	browserBrowser := &browser.Browser{}
-	cmdInterface := NewCmdForHeadless(clockReal, stdin, stdout, loggerInterface, browserBrowser)
-	return cmdInterface
-}
-
-var (
-	_wireFileValue   = os.Stdin
-	_wireOsFileValue = os.Stdout
-)
-
-func NewCmdForHeadless(clockInterface clock.Interface, stdin stdio.Stdin, stdout stdio.Stdout, loggerInterface logger.Interface, browserInterface browser.Interface) cmd.Interface {
-	loaderLoader := loader.Loader{}
-	factory := &client.Factory{
-		Loader: loaderLoader,
-		Clock:  clockInterface,
-		Logger: loggerInterface,
-	}
-	authcodeBrowser := &authcode.Browser{
-		Browser: browserInterface,
-		Logger:  loggerInterface,
-	}
-	readerReader := &reader.Reader{
-		Stdin: stdin,
-	}
-	keyboard := &authcode.Keyboard{
-		Reader: readerReader,
-		Logger: loggerInterface,
-	}
-	ropcROPC := &ropc.ROPC{
-		Reader: readerReader,
-		Logger: loggerInterface,
-	}
-	authenticationAuthentication := &authentication.Authentication{
-		ClientFactory:    factory,
-		Logger:           loggerInterface,
-		Clock:            clockInterface,
-		AuthCodeBrowser:  authcodeBrowser,
-		AuthCodeKeyboard: keyboard,
-		ROPC:             ropcROPC,
-	}
-	loader3 := &loader2.Loader{}
-	writerWriter := &writer.Writer{}
-	standaloneStandalone := &standalone.Standalone{
-		Authentication:   authenticationAuthentication,
-		KubeconfigLoader: loader3,
-		KubeconfigWriter: writerWriter,
-		Logger:           loggerInterface,
-	}
-	root := &cmd.Root{
-		Standalone: standaloneStandalone,
-		Logger:     loggerInterface,
-	}
-	repositoryRepository := &repository.Repository{}
-	writer3 := &writer2.Writer{
-		Stdout: stdout,
-	}
-	mutexMutex := &mutex.Mutex{
-		Logger: loggerInterface,
-	}
-	getToken := &credentialplugin.GetToken{
-		Authentication:       authenticationAuthentication,
-		TokenCacheRepository: repositoryRepository,
-		Writer:               writer3,
-		Mutex:                mutexMutex,
-		Logger:               loggerInterface,
-	}
-	cmdGetToken := &cmd.GetToken{
-		GetToken: getToken,
-		Logger:   loggerInterface,
-	}
-	setupSetup := &setup.Setup{
-		Authentication: authenticationAuthentication,
-		Logger:         loggerInterface,
-	}
-	cmdSetup := &cmd.Setup{
-		Setup: setupSetup,
-	}
-	cmdCmd := &cmd.Cmd{
-		Root:     root,
-		GetToken: cmdGetToken,
-		Setup:    cmdSetup,
-		Logger:   loggerInterface,
-	}
-	return cmdCmd
-}
--- a/pkg/infrastructure/browser/browser.go
+++ b/pkg/infrastructure/browser/browser.go
@@ -1,33 +0,0 @@
-package browser
-
-import (
-	"os"
-
-	"github.com/google/wire"
-	"github.com/pkg/browser"
-)
-
-//go:generate mockgen -destination mock_browser/mock_browser.go github.com/int128/kubelogin/pkg/infrastructure/browser Interface
-
-func init() {
-	// In credential plugin mode, some browser launcher writes a message to stdout
-	// and it may break the credential json for client-go.
-	// This prevents the browser launcher from breaking the credential json.
-	browser.Stdout = os.Stderr
-}
-
-var Set = wire.NewSet(
-	wire.Struct(new(Browser)),
-	wire.Bind(new(Interface), new(*Browser)),
-)
-
-type Interface interface {
-	Open(url string) error
-}
-
-type Browser struct{}
-
-// Open opens the default browser.
-func (*Browser) Open(url string) error {
-	return browser.OpenURL(url)
-}
--- a/pkg/infrastructure/browser/mock_browser/mock_browser.go
+++ b/pkg/infrastructure/browser/mock_browser/mock_browser.go
@@ -1,47 +0,0 @@
-// Code generated by MockGen. DO NOT EDIT.
-// Source: github.com/int128/kubelogin/pkg/infrastructure/browser (interfaces: Interface)
-
-// Package mock_browser is a generated GoMock package.
-package mock_browser
-
-import (
-	gomock "github.com/golang/mock/gomock"
-	reflect "reflect"
-)
-
-// MockInterface is a mock of Interface interface
-type MockInterface struct {
-	ctrl     *gomock.Controller
-	recorder *MockInterfaceMockRecorder
-}
-
-// MockInterfaceMockRecorder is the mock recorder for MockInterface
-type MockInterfaceMockRecorder struct {
-	mock *MockInterface
-}
-
-// NewMockInterface creates a new mock instance
-func NewMockInterface(ctrl *gomock.Controller) *MockInterface {
-	mock := &MockInterface{ctrl: ctrl}
-	mock.recorder = &MockInterfaceMockRecorder{mock}
-	return mock
-}
-
-// EXPECT returns an object that allows the caller to indicate expected use
-func (m *MockInterface) EXPECT() *MockInterfaceMockRecorder {
-	return m.recorder
-}
-
-// Open mocks base method
-func (m *MockInterface) Open(arg0 string) error {
-	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "Open", arg0)
-	ret0, _ := ret[0].(error)
-	return ret0
-}
-
-// Open indicates an expected call of Open
-func (mr *MockInterfaceMockRecorder) Open(arg0 interface{}) *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Open", reflect.TypeOf((*MockInterface)(nil).Open), arg0)
-}
--- a/pkg/infrastructure/clock/clock.go
+++ b/pkg/infrastructure/clock/clock.go
@@ -1,24 +0,0 @@
-// Package clock provides the system clock.
-package clock
-
-import (
-	"time"
-
-	"github.com/google/wire"
-)
-
-var Set = wire.NewSet(
-	wire.Struct(new(Real), "*"),
-	wire.Bind(new(Interface), new(*Real)),
-)
-
-type Interface interface {
-	Now() time.Time
-}
-
-type Real struct{}
-
-// Now returns the current time.
-func (c *Real) Now() time.Time {
-	return time.Now()
-}
--- a/pkg/infrastructure/logger/logger.go
+++ b/pkg/infrastructure/logger/logger.go
@@ -1,60 +0,0 @@
-package logger
-
-import (
-	"flag"
-	"log"
-	"os"
-
-	"github.com/google/wire"
-	"github.com/spf13/pflag"
-	"k8s.io/klog/v2"
-)
-
-// Set provides an implementation and interface for Logger.
-var Set = wire.NewSet(
-	New,
-)
-
-// New returns a Logger with the standard log.Logger and klog.
-func New() Interface {
-	return &Logger{
-		goLogger: log.New(os.Stderr, "", 0),
-	}
-}
-
-type Interface interface {
-	AddFlags(f *pflag.FlagSet)
-	Printf(format string, args ...interface{})
-	V(level int) Verbose
-	IsEnabled(level int) bool
-}
-
-type Verbose interface {
-	Infof(format string, args ...interface{})
-}
-
-type goLogger interface {
-	Printf(format string, v ...interface{})
-}
-
-// Logger provides logging facility using log.Logger and klog.
-type Logger struct {
-	goLogger
-}
-
-// AddFlags adds the flags such as -v.
-func (*Logger) AddFlags(f *pflag.FlagSet) {
-	gf := flag.NewFlagSet("", flag.ContinueOnError)
-	klog.InitFlags(gf)
-	f.AddGoFlagSet(gf)
-}
-
-// V returns a logger enabled only if the level is enabled.
-func (*Logger) V(level int) Verbose {
-	return klog.V(klog.Level(level))
-}
-
-// IsEnabled returns true if the level is enabled.
-func (*Logger) IsEnabled(level int) bool {
-	return klog.V(klog.Level(level)).Enabled()
-}
--- a/pkg/infrastructure/mutex/mock_mutex/mock_mutex.go
+++ b/pkg/infrastructure/mutex/mock_mutex/mock_mutex.go
@@ -1,64 +0,0 @@
-// Code generated by MockGen. DO NOT EDIT.
-// Source: github.com/int128/kubelogin/pkg/infrastructure/mutex (interfaces: Interface)
-
-// Package mock_mutex is a generated GoMock package.
-package mock_mutex
-
-import (
-	context "context"
-	gomock "github.com/golang/mock/gomock"
-	mutex "github.com/int128/kubelogin/pkg/infrastructure/mutex"
-	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
-}
-
-// Acquire mocks base method
-func (m *MockInterface) Acquire(arg0 context.Context, arg1 string) (*mutex.Lock, error) {
-	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "Acquire", arg0, arg1)
-	ret0, _ := ret[0].(*mutex.Lock)
-	ret1, _ := ret[1].(error)
-	return ret0, ret1
-}
-
-// Acquire indicates an expected call of Acquire
-func (mr *MockInterfaceMockRecorder) Acquire(arg0, arg1 interface{}) *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Acquire", reflect.TypeOf((*MockInterface)(nil).Acquire), arg0, arg1)
-}
-
-// Release mocks base method
-func (m *MockInterface) Release(arg0 *mutex.Lock) error {
-	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "Release", arg0)
-	ret0, _ := ret[0].(error)
-	return ret0
-}
-
-// Release indicates an expected call of Release
-func (mr *MockInterfaceMockRecorder) Release(arg0 interface{}) *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Release", reflect.TypeOf((*MockInterface)(nil).Release), arg0)
-}
--- a/pkg/infrastructure/mutex/mutex.go
+++ b/pkg/infrastructure/mutex/mutex.go
@@ -1,88 +0,0 @@
-package mutex
-
-import (
-	"context"
-	"fmt"
-	"github.com/alexflint/go-filemutex"
-	"github.com/google/wire"
-	"github.com/int128/kubelogin/pkg/infrastructure/logger"
-	"os"
-	"path"
-)
-
-//go:generate mockgen -destination mock_mutex/mock_mutex.go github.com/int128/kubelogin/pkg/infrastructure/mutex Interface
-
-var Set = wire.NewSet(
-	wire.Struct(new(Mutex), "*"),
-	wire.Bind(new(Interface), new(*Mutex)),
-)
-
-type Interface interface {
-	Acquire(ctx context.Context, name string) (*Lock, error)
-	Release(lock *Lock) error
-}
-
-// Lock holds the lock data.
-type Lock struct {
-	Data interface{}
-	Name string
-}
-
-type Mutex struct {
-	Logger logger.Interface
-}
-
-// internalAcquire wait for acquisition of the lock
-func internalAcquire(fm *filemutex.FileMutex) chan error {
-	result := make(chan error)
-	go func() {
-		if err := fm.Lock(); err != nil {
-			result <- err
-		}
-		close(result)
-	}()
-	return result
-}
-
-// internalRelease disposes of resources associated with a lock
-func internalRelease(fm *filemutex.FileMutex, lfn string, log logger.Interface) error {
-	err := fm.Close()
-	if err != nil {
-		log.V(1).Infof("Error closing lock file %s: %s", lfn, err)
-	}
-	return err
-}
-
-// LockFileName get the lock file name from the lock name.
-func LockFileName(name string) string {
-	return path.Join(os.TempDir(), fmt.Sprintf(".kubelogin.%s.lock", name))
-}
-
-// Acquire acquire a lock for the specified name. The context could be used to set a timeout.
-func (m *Mutex) Acquire(ctx context.Context, name string) (*Lock, error) {
-	lfn := LockFileName(name)
-	fm, err := filemutex.New(lfn)
-	if err != nil {
-		return nil, fmt.Errorf("error creating mutex file %s: %w", lfn, err)
-	}
-
-	lockChan := internalAcquire(fm)
-	select {
-	case <-ctx.Done():
-		_ = internalRelease(fm, lfn, m.Logger)
-		return nil, ctx.Err()
-	case err := <-lockChan:
-		if err != nil {
-			_ = internalRelease(fm, lfn, m.Logger)
-			return nil, fmt.Errorf("error acquiring lock on file %s: %w", lfn, err)
-		}
-		return &Lock{Data: fm, Name: name}, nil
-	}
-}
-
-// Release release the specified lock
-func (m *Mutex) Release(lock *Lock) error {
-	fm := lock.Data.(*filemutex.FileMutex)
-	lfn := LockFileName(lock.Name)
-	return internalRelease(fm, lfn, m.Logger)
-}
--- a/pkg/infrastructure/mutex/mutex_test.go
+++ b/pkg/infrastructure/mutex/mutex_test.go
@@ -1,64 +0,0 @@
-package mutex
-
-import (
-	"fmt"
-	"github.com/int128/kubelogin/pkg/infrastructure/logger"
-	"golang.org/x/net/context"
-	"math/rand"
-	"sync"
-	"testing"
-	"time"
-)
-
-func TestMutex(t *testing.T) {
-
-	t.Run("Test successful parallel acquisition with no reentry allowed", func(t *testing.T) {
-
-		ctx, cancel := context.WithCancel(context.Background())
-		defer cancel()
-
-		nbConcurrency := 20
-		wg := sync.WaitGroup{}
-		events := make(chan int, nbConcurrency*2)
-		errors := make(chan error, nbConcurrency)
-		doLockUnlock := func() {
-			defer wg.Done()
-
-			m := Mutex{
-				Logger: logger.New(),
-			}
-			if mutex, err := m.Acquire(ctx, "test"); err == nil {
-				events <- 1
-				var dur = time.Duration(rand.Intn(5000))
-				time.Sleep(dur * time.Microsecond)
-				events <- -1
-				if err := m.Release(mutex); err != nil {
-					errors <- fmt.Errorf("Release error: %w", err)
-				}
-			} else {
-				errors <- fmt.Errorf("Acquire error: %w", err)
-			}
-		}
-
-		for i := 0; i < nbConcurrency; i++ {
-			wg.Add(1)
-			go doLockUnlock()
-		}
-
-		wg.Wait()
-		close(events)
-		close(errors)
-
-		countConcurrent := 0
-		for delta := range events {
-			countConcurrent += delta
-			if countConcurrent > 1 {
-				t.Errorf("The mutex did not prevented reentry: %d", countConcurrent)
-			}
-		}
-
-		for anError := range errors {
-			t.Errorf("The gorouting returned an error: %s", anError)
-		}
-	})
-}
--- a/pkg/infrastructure/reader/mock_reader/mock_reader.go
+++ b/pkg/infrastructure/reader/mock_reader/mock_reader.go
@@ -1,63 +0,0 @@
-// Code generated by MockGen. DO NOT EDIT.
-// Source: github.com/int128/kubelogin/pkg/infrastructure/reader (interfaces: Interface)
-
-// Package mock_reader is a generated GoMock package.
-package mock_reader
-
-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
-}
-
-// 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)
-}
--- a/pkg/infrastructure/reader/reader.go
+++ b/pkg/infrastructure/reader/reader.go
@@ -1,60 +0,0 @@
-// Package reader provides the reader of standard input.
-package reader
-
-import (
-	"bufio"
-	"fmt"
-	"os"
-	"strings"
-	"syscall"
-
-	"github.com/google/wire"
-	"github.com/int128/kubelogin/pkg/infrastructure/stdio"
-	"golang.org/x/term"
-)
-
-//go:generate mockgen -destination mock_reader/mock_reader.go github.com/int128/kubelogin/pkg/infrastructure/reader Interface
-
-// Set provides an implementation and interface for Reader.
-var Set = wire.NewSet(
-	wire.Struct(new(Reader), "*"),
-	wire.Bind(new(Interface), new(*Reader)),
-)
-
-type Interface interface {
-	ReadString(prompt string) (string, error)
-	ReadPassword(prompt string) (string, error)
-}
-
-type Reader struct {
-	Stdin stdio.Stdin
-}
-
-// ReadString reads a string from the stdin.
-func (x *Reader) ReadString(prompt string) (string, error) {
-	if _, err := fmt.Fprint(os.Stderr, prompt); err != nil {
-		return "", fmt.Errorf("write error: %w", err)
-	}
-	r := bufio.NewReader(x.Stdin)
-	s, err := r.ReadString('\n')
-	if err != nil {
-		return "", fmt.Errorf("read error: %w", err)
-	}
-	s = strings.TrimRight(s, "\r\n")
-	return s, nil
-}
-
-// ReadPassword reads a password from the stdin without echo back.
-func (*Reader) ReadPassword(prompt string) (string, error) {
-	if _, err := fmt.Fprint(os.Stderr, prompt); err != nil {
-		return "", fmt.Errorf("write error: %w", err)
-	}
-	b, err := term.ReadPassword(int(syscall.Stdin))
-	if err != nil {
-		return "", fmt.Errorf("read error: %w", err)
-	}
-	if _, err := fmt.Fprintln(os.Stderr); err != nil {
-		return "", fmt.Errorf("write error: %w", err)
-	}
-	return string(b), nil
-}
--- a/pkg/infrastructure/stdio/stdio.go
+++ b/pkg/infrastructure/stdio/stdio.go
@@ -1,17 +0,0 @@
-// Package stdio wraps os.Stdin and os.Stdout for testing.
-package stdio
-
-import (
-	"io"
-	"os"
-
-	"github.com/google/wire"
-)
-
-var Set = wire.NewSet(
-	wire.InterfaceValue(new(Stdin), os.Stdin),
-	wire.InterfaceValue(new(Stdout), os.Stdout),
-)
-
-type Stdout io.Writer
-type Stdin io.Reader
--- a/pkg/jwt/decode.go
+++ b/pkg/jwt/decode.go
@@ -1,71 +0,0 @@
-// Package jwt provides JWT manipulations.
-// See https://tools.ietf.org/html/rfc7519#section-4.1.3
-package jwt
-
-import (
-	"bytes"
-	"encoding/base64"
-	"encoding/json"
-	"fmt"
-	"strings"
-	"time"
-)
-
-// DecodeWithoutVerify decodes the JWT string and returns the claims.
-// Note that this method does not verify the signature and always trust it.
-func DecodeWithoutVerify(s string) (*Claims, error) {
-	payload, err := DecodePayloadAsRawJSON(s)
-	if err != nil {
-		return nil, fmt.Errorf("could not decode the payload: %w", err)
-	}
-	var claims struct {
-		Subject   string `json:"sub,omitempty"`
-		ExpiresAt int64  `json:"exp,omitempty"`
-	}
-	if err := json.NewDecoder(bytes.NewReader(payload)).Decode(&claims); err != nil {
-		return nil, fmt.Errorf("could not decode the json of token: %w", err)
-	}
-	var prettyJson bytes.Buffer
-	if err := json.Indent(&prettyJson, payload, "", "  "); err != nil {
-		return nil, fmt.Errorf("could not indent the json of token: %w", err)
-	}
-	return &Claims{
-		Subject: claims.Subject,
-		Expiry:  time.Unix(claims.ExpiresAt, 0),
-		Pretty:  prettyJson.String(),
-	}, nil
-}
-
-// DecodePayloadAsPrettyJSON decodes the JWT string and returns the pretty JSON string.
-func DecodePayloadAsPrettyJSON(s string) (string, error) {
-	payload, err := DecodePayloadAsRawJSON(s)
-	if err != nil {
-		return "", fmt.Errorf("could not decode the payload: %w", err)
-	}
-	var prettyJson bytes.Buffer
-	if err := json.Indent(&prettyJson, payload, "", "  "); err != nil {
-		return "", fmt.Errorf("could not indent the json of token: %w", err)
-	}
-	return prettyJson.String(), nil
-}
-
-// DecodePayloadAsRawJSON extracts the payload and returns the raw JSON.
-func DecodePayloadAsRawJSON(s string) ([]byte, error) {
-	parts := strings.SplitN(s, ".", 3)
-	if len(parts) != 3 {
-		return nil, fmt.Errorf("wants %d segments but got %d segments", 3, len(parts))
-	}
-	payloadJSON, err := decodePayload(parts[1])
-	if err != nil {
-		return nil, fmt.Errorf("could not decode the payload: %w", err)
-	}
-	return payloadJSON, nil
-}
-
-func decodePayload(payload string) ([]byte, error) {
-	b, err := base64.URLEncoding.WithPadding(base64.NoPadding).DecodeString(payload)
-	if err != nil {
-		return nil, fmt.Errorf("invalid base64: %w", err)
-	}
-	return b, nil
-}
--- a/pkg/jwt/decode_test.go
+++ b/pkg/jwt/decode_test.go
@@ -1,48 +0,0 @@
-package jwt
-
-import (
-	"testing"
-	"time"
-
-	"github.com/google/go-cmp/cmp"
-)
-
-func TestDecode(t *testing.T) {
-	t.Run("ValidToken", func(t *testing.T) {
-		const (
-			// https://tools.ietf.org/html/rfc7519#section-3.1
-			header    = "eyJ0eXAiOiJKV1QiLA0KICJhbGciOiJIUzI1NiJ9"
-			payload   = "eyJpc3MiOiJqb2UiLA0KICJleHAiOjEzMDA4MTkzODAsDQogImh0dHA6Ly9leGFtcGxlLmNvbS9pc19yb290Ijp0cnVlfQ"
-			signature = "dBjftJeZ4CVP-mB92K27uhbUJU1p1r_wW1gFWFOEjXk"
-			token     = header + "." + payload + "." + signature
-		)
-		got, err := DecodeWithoutVerify(token)
-		if err != nil {
-			t.Fatalf("Decode error: %s", err)
-		}
-		want := &Claims{
-			Subject: "",
-			Expiry:  time.Unix(1300819380, 0),
-			Pretty: `{
-  "iss": "joe",
-  "exp": 1300819380,
-  "http://example.com/is_root": true
-}`,
-		}
-		if diff := cmp.Diff(want, got); diff != "" {
-			t.Errorf("mismatch (-want +got):\n%s", diff)
-		}
-	})
-
-	t.Run("InvalidToken", func(t *testing.T) {
-		decodedToken, err := DecodeWithoutVerify("HEADER.INVALID_TOKEN.SIGNATURE")
-		if err == nil {
-			t.Errorf("error wants non-nil but nil")
-		} else {
-			t.Logf("expected error: %+v", err)
-		}
-		if decodedToken != nil {
-			t.Errorf("decodedToken wants nil but %+v", decodedToken)
-		}
-	})
-}
--- a/pkg/jwt/token.go
+++ b/pkg/jwt/token.go
@@ -1,20 +0,0 @@
-package jwt
-
-import "time"
-
-// Claims represents claims of an ID token.
-type Claims struct {
-	Subject string
-	Expiry  time.Time
-	Pretty  string // string representation for debug and logging
-}
-
-// Clock provides the current time.
-type Clock interface {
-	Now() time.Time
-}
-
-// IsExpired returns true if the token is expired.
-func (c *Claims) IsExpired(clock Clock) bool {
-	return c.Expiry.Before(clock.Now())
-}
--- a/pkg/jwt/token_test.go
+++ b/pkg/jwt/token_test.go
@@ -1,36 +0,0 @@
-package jwt_test
-
-import (
-	"testing"
-	"time"
-
-	"github.com/int128/kubelogin/pkg/jwt"
-)
-
-type timeProvider time.Time
-
-func (tp timeProvider) Now() time.Time {
-	return time.Time(tp)
-}
-
-func TestClaims_IsExpired(t *testing.T) {
-	claims := jwt.Claims{
-		Expiry: time.Date(2019, 1, 2, 3, 4, 5, 0, time.UTC),
-	}
-
-	t.Run("Expired", func(t *testing.T) {
-		tp := timeProvider(time.Date(2019, 1, 2, 4, 0, 0, 0, time.UTC))
-		got := claims.IsExpired(tp)
-		if got != true {
-			t.Errorf("IsExpired() wants true but false")
-		}
-	})
-
-	t.Run("NotExpired", func(t *testing.T) {
-		tp := timeProvider(time.Date(2019, 1, 2, 0, 0, 0, 0, time.UTC))
-		got := claims.IsExpired(tp)
-		if got != false {
-			t.Errorf("IsExpired() wants false but true")
-		}
-	})
-}
--- a/pkg/kubeconfig/loader/load.go
+++ b/pkg/kubeconfig/loader/load.go
@@ -1,96 +0,0 @@
-package loader
-
-import (
-	"errors"
-	"fmt"
-	"strings"
-
-	"github.com/google/wire"
-	"github.com/int128/kubelogin/pkg/kubeconfig"
-	"k8s.io/client-go/tools/clientcmd"
-	"k8s.io/client-go/tools/clientcmd/api"
-)
-
-//go:generate mockgen -destination mock_loader/mock_loader.go github.com/int128/kubelogin/pkg/kubeconfig/loader Interface
-
-var Set = wire.NewSet(
-	wire.Struct(new(Loader), "*"),
-	wire.Bind(new(Interface), new(*Loader)),
-)
-
-type Interface interface {
-	GetCurrentAuthProvider(explicitFilename string, contextName kubeconfig.ContextName, userName kubeconfig.UserName) (*kubeconfig.AuthProvider, error)
-}
-
-type Loader struct{}
-
-func (Loader) GetCurrentAuthProvider(explicitFilename string, contextName kubeconfig.ContextName, userName kubeconfig.UserName) (*kubeconfig.AuthProvider, error) {
-	config, err := loadByDefaultRules(explicitFilename)
-	if err != nil {
-		return nil, fmt.Errorf("could not load the kubeconfig: %w", err)
-	}
-	auth, err := findCurrentAuthProvider(config, contextName, userName)
-	if err != nil {
-		return nil, fmt.Errorf("could not find the current auth provider: %w", err)
-	}
-	return auth, nil
-}
-
-func loadByDefaultRules(explicitFilename string) (*api.Config, error) {
-	rules := clientcmd.NewDefaultClientConfigLoadingRules()
-	rules.ExplicitPath = explicitFilename
-	config, err := rules.Load()
-	if err != nil {
-		return nil, fmt.Errorf("load error: %w", err)
-	}
-	return config, err
-}
-
-// findCurrentAuthProvider resolves the current auth provider.
-// If contextName is given, this returns the user of the context.
-// If userName is given, this ignores the context and returns the user.
-// If any context or user is not found, this returns an error.
-func findCurrentAuthProvider(config *api.Config, contextName kubeconfig.ContextName, userName kubeconfig.UserName) (*kubeconfig.AuthProvider, error) {
-	if userName == "" {
-		if contextName == "" {
-			contextName = kubeconfig.ContextName(config.CurrentContext)
-		}
-		contextNode, ok := config.Contexts[string(contextName)]
-		if !ok {
-			return nil, fmt.Errorf("context %s does not exist", contextName)
-		}
-		userName = kubeconfig.UserName(contextNode.AuthInfo)
-	}
-	userNode, ok := config.AuthInfos[string(userName)]
-	if !ok {
-		return nil, fmt.Errorf("user %s does not exist", userName)
-	}
-	if userNode.AuthProvider == nil {
-		return nil, errors.New("auth-provider is missing")
-	}
-	if userNode.AuthProvider.Name != "oidc" {
-		return nil, fmt.Errorf("auth-provider.name must be oidc but is %s", userNode.AuthProvider.Name)
-	}
-	if userNode.AuthProvider.Config == nil {
-		return nil, errors.New("auth-provider.config is missing")
-	}
-
-	m := userNode.AuthProvider.Config
-	var extraScopes []string
-	if m["extra-scopes"] != "" {
-		extraScopes = strings.Split(m["extra-scopes"], ",")
-	}
-	return &kubeconfig.AuthProvider{
-		LocationOfOrigin:            userNode.LocationOfOrigin,
-		UserName:                    userName,
-		ContextName:                 contextName,
-		IDPIssuerURL:                m["idp-issuer-url"],
-		ClientID:                    m["client-id"],
-		ClientSecret:                m["client-secret"],
-		IDPCertificateAuthority:     m["idp-certificate-authority"],
-		IDPCertificateAuthorityData: m["idp-certificate-authority-data"],
-		ExtraScopes:                 extraScopes,
-		IDToken:                     m["id-token"],
-		RefreshToken:                m["refresh-token"],
-	}, nil
-}
--- a/pkg/kubeconfig/loader/load_test.go
+++ b/pkg/kubeconfig/loader/load_test.go
@@ -1,219 +0,0 @@
-package loader
-
-import (
-	"os"
-	"testing"
-
-	"github.com/google/go-cmp/cmp"
-	"github.com/int128/kubelogin/pkg/kubeconfig"
-	"k8s.io/client-go/tools/clientcmd/api"
-)
-
-func Test_loadByDefaultRules(t *testing.T) {
-	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 := 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 := 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)
-	}
-}
-
-func Test_findCurrentAuthProvider(t *testing.T) {
-	t.Run("CurrentContext", func(t *testing.T) {
-		got, err := findCurrentAuthProvider(&api.Config{
-			CurrentContext: "theContext",
-			Contexts: map[string]*api.Context{
-				"theContext": {
-					AuthInfo: "theUser",
-				},
-			},
-			AuthInfos: map[string]*api.AuthInfo{
-				"theUser": {
-					LocationOfOrigin: "/path/to/kubeconfig",
-					AuthProvider: &api.AuthProviderConfig{
-						Name: "oidc",
-						Config: map[string]string{
-							"idp-issuer-url":                 "https://accounts.google.com",
-							"client-id":                      "GOOGLE_CLIENT_ID",
-							"client-secret":                  "GOOGLE_CLIENT_SECRET",
-							"idp-certificate-authority":      "/path/to/cert",
-							"idp-certificate-authority-data": "BASE64",
-							"extra-scopes":                   "email,profile",
-							"id-token":                       "YOUR_ID_TOKEN",
-							"refresh-token":                  "YOUR_REFRESH_TOKEN",
-						},
-					},
-				},
-			},
-		}, "", "")
-		if err != nil {
-			t.Fatalf("Could not find the current auth: %s", err)
-		}
-		want := &kubeconfig.AuthProvider{
-			LocationOfOrigin:            "/path/to/kubeconfig",
-			UserName:                    "theUser",
-			ContextName:                 "theContext",
-			IDPIssuerURL:                "https://accounts.google.com",
-			ClientID:                    "GOOGLE_CLIENT_ID",
-			ClientSecret:                "GOOGLE_CLIENT_SECRET",
-			IDPCertificateAuthority:     "/path/to/cert",
-			IDPCertificateAuthorityData: "BASE64",
-			ExtraScopes:                 []string{"email", "profile"},
-			IDToken:                     "YOUR_ID_TOKEN",
-			RefreshToken:                "YOUR_REFRESH_TOKEN",
-		}
-		if diff := cmp.Diff(want, got); diff != "" {
-			t.Errorf("mismatch (-want +got):\n%s", diff)
-		}
-	})
-
-	t.Run("ByContextName", func(t *testing.T) {
-		got, err := findCurrentAuthProvider(&api.Config{
-			Contexts: map[string]*api.Context{
-				"theContext": {
-					AuthInfo: "theUser",
-				},
-			},
-			AuthInfos: map[string]*api.AuthInfo{
-				"theUser": {
-					LocationOfOrigin: "/path/to/kubeconfig",
-					AuthProvider: &api.AuthProviderConfig{
-						Name: "oidc",
-						Config: map[string]string{
-							"idp-issuer-url": "https://accounts.google.com",
-						},
-					},
-				},
-			},
-		}, "theContext", "")
-		if err != nil {
-			t.Fatalf("Could not find the current auth: %s", err)
-		}
-		want := &kubeconfig.AuthProvider{
-			LocationOfOrigin: "/path/to/kubeconfig",
-			UserName:         "theUser",
-			ContextName:      "theContext",
-			IDPIssuerURL:     "https://accounts.google.com",
-		}
-		if diff := cmp.Diff(want, got); diff != "" {
-			t.Errorf("mismatch (-want +got):\n%s", diff)
-		}
-	})
-
-	t.Run("ByUserName", func(t *testing.T) {
-		got, err := findCurrentAuthProvider(&api.Config{
-			AuthInfos: map[string]*api.AuthInfo{
-				"theUser": {
-					LocationOfOrigin: "/path/to/kubeconfig",
-					AuthProvider: &api.AuthProviderConfig{
-						Name: "oidc",
-						Config: map[string]string{
-							"idp-issuer-url": "https://accounts.google.com",
-						},
-					},
-				},
-			},
-		}, "", "theUser")
-		if err != nil {
-			t.Fatalf("Could not find the current auth: %s", err)
-		}
-		want := &kubeconfig.AuthProvider{
-			LocationOfOrigin: "/path/to/kubeconfig",
-			UserName:         "theUser",
-			IDPIssuerURL:     "https://accounts.google.com",
-		}
-		if diff := cmp.Diff(want, got); diff != "" {
-			t.Errorf("mismatch (-want +got):\n%s", diff)
-		}
-	})
-
-	t.Run("NoConfig", func(t *testing.T) {
-		_, err := findCurrentAuthProvider(&api.Config{
-			AuthInfos: map[string]*api.AuthInfo{
-				"theUser": {
-					LocationOfOrigin: "/path/to/kubeconfig",
-					AuthProvider: &api.AuthProviderConfig{
-						Name: "oidc",
-					},
-				},
-			},
-		}, "", "theUser")
-		if err == nil {
-			t.Fatalf("wants error but nil")
-		}
-	})
-
-	t.Run("NotOIDC", func(t *testing.T) {
-		_, err := findCurrentAuthProvider(&api.Config{
-			AuthInfos: map[string]*api.AuthInfo{
-				"theUser": {
-					LocationOfOrigin: "/path/to/kubeconfig",
-					AuthProvider: &api.AuthProviderConfig{
-						Name:   "some",
-						Config: map[string]string{"foo": "bar"},
-					},
-				},
-			},
-		}, "", "theUser")
-		if err == nil {
-			t.Fatalf("wants error but nil")
-		}
-	})
-}
--- a/pkg/kubeconfig/loader/mock_loader/mock_loader.go
+++ b/pkg/kubeconfig/loader/mock_loader/mock_loader.go
@@ -1,49 +0,0 @@
-// Code generated by MockGen. DO NOT EDIT.
-// Source: github.com/int128/kubelogin/pkg/kubeconfig/loader (interfaces: Interface)
-
-// Package mock_loader is a generated GoMock package.
-package mock_loader
-
-import (
-	gomock "github.com/golang/mock/gomock"
-	kubeconfig "github.com/int128/kubelogin/pkg/kubeconfig"
-	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
-}
-
-// GetCurrentAuthProvider mocks base method
-func (m *MockInterface) GetCurrentAuthProvider(arg0 string, arg1 kubeconfig.ContextName, arg2 kubeconfig.UserName) (*kubeconfig.AuthProvider, error) {
-	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "GetCurrentAuthProvider", arg0, arg1, arg2)
-	ret0, _ := ret[0].(*kubeconfig.AuthProvider)
-	ret1, _ := ret[1].(error)
-	return ret0, ret1
-}
-
-// GetCurrentAuthProvider indicates an expected call of GetCurrentAuthProvider
-func (mr *MockInterfaceMockRecorder) GetCurrentAuthProvider(arg0, arg1, arg2 interface{}) *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "GetCurrentAuthProvider", reflect.TypeOf((*MockInterface)(nil).GetCurrentAuthProvider), arg0, arg1, arg2)
-}
--- a/pkg/kubeconfig/loader/testdata/kubeconfig.google.yaml
+++ b/pkg/kubeconfig/loader/testdata/kubeconfig.google.yaml
@@ -1,17 +0,0 @@
-apiVersion: v1
-clusters: []
-contexts:
-  - context:
-      cluster: hello.k8s.local
-      user: google
-    name: google@hello.k8s.local
-current-context: google@hello.k8s.local
-kind: Config
-preferences: {}
-users:
-  - name: google
-    user:
-      auth-provider:
-        config:
-          client-id: CLIENT_ID.apps.googleusercontent.com
-        name: oidc
--- a/pkg/kubeconfig/loader/testdata/kubeconfig.keycloak.yaml
+++ b/pkg/kubeconfig/loader/testdata/kubeconfig.keycloak.yaml
@@ -1,16 +0,0 @@
-apiVersion: v1
-contexts:
-  - context:
-      cluster: hello.k8s.local
-      user: keycloak
-    name: keycloak@hello.k8s.local
-current-context: keycloak@hello.k8s.local
-kind: Config
-preferences: {}
-users:
-  - name: keycloak
-    user:
-      auth-provider:
-        config:
-          client-id: kubernetes
-        name: oidc
--- a/pkg/kubeconfig/types.go
+++ b/pkg/kubeconfig/types.go
@@ -1,23 +0,0 @@
-package kubeconfig
-
-// ContextName represents name of a context.
-type ContextName string
-
-// UserName represents name of a user.
-type UserName string
-
-// AuthProvider represents the authentication provider,
-// i.e. context, user and auth-provider in a kubeconfig.
-type AuthProvider struct {
-	LocationOfOrigin            string      // Path to the kubeconfig file which contains the user
-	UserName                    UserName    // User name
-	ContextName                 ContextName // (optional) Context name
-	IDPIssuerURL                string      // idp-issuer-url
-	ClientID                    string      // client-id
-	ClientSecret                string      // (optional) client-secret
-	IDPCertificateAuthority     string      // (optional) idp-certificate-authority
-	IDPCertificateAuthorityData string      // (optional) idp-certificate-authority-data
-	ExtraScopes                 []string    // (optional) extra-scopes
-	IDToken                     string      // (optional) id-token
-	RefreshToken                string      // (optional) refresh-token
-}
--- a/pkg/kubeconfig/writer/mock_writer/mock_writer.go
+++ b/pkg/kubeconfig/writer/mock_writer/mock_writer.go
@@ -1,48 +0,0 @@
-// Code generated by MockGen. DO NOT EDIT.
-// Source: github.com/int128/kubelogin/pkg/kubeconfig/writer (interfaces: Interface)
-
-// Package mock_writer is a generated GoMock package.
-package mock_writer
-
-import (
-	gomock "github.com/golang/mock/gomock"
-	kubeconfig "github.com/int128/kubelogin/pkg/kubeconfig"
-	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
-}
-
-// UpdateAuthProvider mocks base method
-func (m *MockInterface) UpdateAuthProvider(arg0 kubeconfig.AuthProvider) error {
-	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "UpdateAuthProvider", arg0)
-	ret0, _ := ret[0].(error)
-	return ret0
-}
-
-// UpdateAuthProvider indicates an expected call of UpdateAuthProvider
-func (mr *MockInterfaceMockRecorder) UpdateAuthProvider(arg0 interface{}) *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "UpdateAuthProvider", reflect.TypeOf((*MockInterface)(nil).UpdateAuthProvider), arg0)
-}
--- a/pkg/kubeconfig/writer/write.go
+++ b/pkg/kubeconfig/writer/write.go
@@ -1,65 +0,0 @@
-package writer
-
-import (
-	"fmt"
-	"strings"
-
-	"github.com/google/wire"
-	"github.com/int128/kubelogin/pkg/kubeconfig"
-	"k8s.io/client-go/tools/clientcmd"
-)
-
-//go:generate mockgen -destination mock_writer/mock_writer.go github.com/int128/kubelogin/pkg/kubeconfig/writer Interface
-
-var Set = wire.NewSet(
-	wire.Struct(new(Writer), "*"),
-	wire.Bind(new(Interface), new(*Writer)),
-)
-
-type Interface interface {
-	UpdateAuthProvider(p kubeconfig.AuthProvider) error
-}
-
-type Writer struct{}
-
-func (Writer) UpdateAuthProvider(p kubeconfig.AuthProvider) error {
-	config, err := clientcmd.LoadFromFile(p.LocationOfOrigin)
-	if err != nil {
-		return fmt.Errorf("could not load %s: %w", p.LocationOfOrigin, err)
-	}
-	userNode, ok := config.AuthInfos[string(p.UserName)]
-	if !ok {
-		return fmt.Errorf("user %s does not exist", p.UserName)
-	}
-	if userNode.AuthProvider == nil {
-		return fmt.Errorf("auth-provider is missing")
-	}
-	if userNode.AuthProvider.Name != "oidc" {
-		return fmt.Errorf("auth-provider must be oidc but is %s", userNode.AuthProvider.Name)
-	}
-	copyAuthProviderConfig(p, userNode.AuthProvider.Config)
-	if err := clientcmd.WriteToFile(*config, p.LocationOfOrigin); err != nil {
-		return fmt.Errorf("could not update %s: %w", p.LocationOfOrigin, err)
-	}
-	return nil
-}
-
-func copyAuthProviderConfig(p kubeconfig.AuthProvider, m map[string]string) {
-	setOrDeleteKey(m, "idp-issuer-url", p.IDPIssuerURL)
-	setOrDeleteKey(m, "client-id", p.ClientID)
-	setOrDeleteKey(m, "client-secret", p.ClientSecret)
-	setOrDeleteKey(m, "idp-certificate-authority", p.IDPCertificateAuthority)
-	setOrDeleteKey(m, "idp-certificate-authority-data", p.IDPCertificateAuthorityData)
-	extraScopes := strings.Join(p.ExtraScopes, ",")
-	setOrDeleteKey(m, "extra-scopes", extraScopes)
-	setOrDeleteKey(m, "id-token", p.IDToken)
-	setOrDeleteKey(m, "refresh-token", p.RefreshToken)
-}
-
-func setOrDeleteKey(m map[string]string, key, value string) {
-	if value == "" {
-		delete(m, key)
-		return
-	}
-	m[key] = value
-}
--- a/pkg/kubeconfig/writer/write_test.go
+++ b/pkg/kubeconfig/writer/write_test.go
@@ -1,137 +0,0 @@
-package writer
-
-import (
-	"io/ioutil"
-	"os"
-	"testing"
-
-	"github.com/google/go-cmp/cmp"
-	"github.com/int128/kubelogin/pkg/kubeconfig"
-)
-
-func TestKubeconfig_UpdateAuth(t *testing.T) {
-	var w Writer
-
-	t.Run("MinimumKeys", func(t *testing.T) {
-		f := newKubeconfigFile(t)
-		defer func() {
-			if err := os.Remove(f.Name()); err != nil {
-				t.Errorf("Could not remove the temp file: %s", err)
-			}
-		}()
-		if err := w.UpdateAuthProvider(kubeconfig.AuthProvider{
-			LocationOfOrigin: f.Name(),
-			UserName:         "google",
-			IDPIssuerURL:     "https://accounts.google.com",
-			ClientID:         "GOOGLE_CLIENT_ID",
-			ClientSecret:     "GOOGLE_CLIENT_SECRET",
-			IDToken:          "YOUR_ID_TOKEN",
-			RefreshToken:     "YOUR_REFRESH_TOKEN",
-		}); err != nil {
-			t.Fatalf("Could not update auth: %s", err)
-		}
-		b, err := ioutil.ReadFile(f.Name())
-		if err != nil {
-			t.Fatalf("Could not read kubeconfig: %s", err)
-		}
-
-		got := string(b)
-		want := `apiVersion: v1
-clusters: null
-contexts: null
-current-context: ""
-kind: Config
-preferences: {}
-users:
- name: google
-  user:
-    auth-provider:
-      config:
-        client-id: GOOGLE_CLIENT_ID
-        client-secret: GOOGLE_CLIENT_SECRET
-        id-token: YOUR_ID_TOKEN
-        idp-issuer-url: https://accounts.google.com
-        refresh-token: YOUR_REFRESH_TOKEN
-      name: oidc
-`
-		if diff := cmp.Diff(want, got); diff != "" {
-			t.Errorf("kubeconfig mismatch (-want +got):\n%s", diff)
-		}
-	})
-
-	t.Run("FullKeys", func(t *testing.T) {
-		f := newKubeconfigFile(t)
-		defer func() {
-			if err := os.Remove(f.Name()); err != nil {
-				t.Errorf("Could not remove the temp file: %s", err)
-			}
-		}()
-		if err := w.UpdateAuthProvider(kubeconfig.AuthProvider{
-			LocationOfOrigin:            f.Name(),
-			UserName:                    "google",
-			IDPIssuerURL:                "https://accounts.google.com",
-			ClientID:                    "GOOGLE_CLIENT_ID",
-			ClientSecret:                "GOOGLE_CLIENT_SECRET",
-			IDPCertificateAuthority:     "/path/to/cert",
-			IDPCertificateAuthorityData: "BASE64",
-			ExtraScopes:                 []string{"email", "profile"},
-			IDToken:                     "YOUR_ID_TOKEN",
-			RefreshToken:                "YOUR_REFRESH_TOKEN",
-		}); err != nil {
-			t.Fatalf("Could not update auth: %s", err)
-		}
-		b, err := ioutil.ReadFile(f.Name())
-		if err != nil {
-			t.Fatalf("Could not read kubeconfig: %s", err)
-		}
-
-		got := string(b)
-		want := `apiVersion: v1
-clusters: null
-contexts: null
-current-context: ""
-kind: Config
-preferences: {}
-users:
- name: google
-  user:
-    auth-provider:
-      config:
-        client-id: GOOGLE_CLIENT_ID
-        client-secret: GOOGLE_CLIENT_SECRET
-        extra-scopes: email,profile
-        id-token: YOUR_ID_TOKEN
-        idp-certificate-authority: /path/to/cert
-        idp-certificate-authority-data: BASE64
-        idp-issuer-url: https://accounts.google.com
-        refresh-token: YOUR_REFRESH_TOKEN
-      name: oidc
-`
-		if diff := cmp.Diff(want, got); diff != "" {
-			t.Errorf("kubeconfig mismatch (-want +got):\n%s", diff)
-		}
-	})
-}
-
-func newKubeconfigFile(t *testing.T) *os.File {
-	content := `apiVersion: v1
-clusters: []
-kind: Config
-preferences: {}
-users:
-  - name: google
-    user:
-      auth-provider:
-        config:
-          idp-issuer-url: https://accounts.google.com
-        name: oidc`
-	f, err := ioutil.TempFile("", "kubeconfig")
-	if err != nil {
-		t.Fatalf("Could not create a file: %s", err)
-	}
-	defer f.Close()
-	if _, err := f.Write([]byte(content)); err != nil {
-		t.Fatalf("Could not write kubeconfig: %s", err)
-	}
-	return f
-}
--- a/pkg/oidc/client/client.go
+++ b/pkg/oidc/client/client.go
@@ -1,190 +0,0 @@
-package client
-
-import (
-	"context"
-	"fmt"
-	"net/http"
-	"time"
-
-	gooidc "github.com/coreos/go-oidc/v3/oidc"
-	"github.com/int128/kubelogin/pkg/infrastructure/clock"
-	"github.com/int128/kubelogin/pkg/infrastructure/logger"
-	"github.com/int128/kubelogin/pkg/oidc"
-	"github.com/int128/kubelogin/pkg/pkce"
-	"github.com/int128/oauth2cli"
-	"golang.org/x/oauth2"
-)
-
-//go:generate mockgen -destination mock_client/mock_client.go github.com/int128/kubelogin/pkg/oidc/client Interface
-
-type Interface interface {
-	GetAuthCodeURL(in AuthCodeURLInput) string
-	ExchangeAuthCode(ctx context.Context, in ExchangeAuthCodeInput) (*oidc.TokenSet, error)
-	GetTokenByAuthCode(ctx context.Context, in GetTokenByAuthCodeInput, localServerReadyChan chan<- string) (*oidc.TokenSet, error)
-	GetTokenByROPC(ctx context.Context, username, password string) (*oidc.TokenSet, error)
-	Refresh(ctx context.Context, refreshToken string) (*oidc.TokenSet, error)
-	SupportedPKCEMethods() []string
-}
-
-type AuthCodeURLInput struct {
-	State                  string
-	Nonce                  string
-	PKCEParams             pkce.Params
-	RedirectURI            string
-	AuthRequestExtraParams map[string]string
-}
-
-type ExchangeAuthCodeInput struct {
-	Code        string
-	PKCEParams  pkce.Params
-	Nonce       string
-	RedirectURI string
-}
-
-type GetTokenByAuthCodeInput struct {
-	BindAddress            []string
-	State                  string
-	Nonce                  string
-	PKCEParams             pkce.Params
-	RedirectURLHostname    string
-	AuthRequestExtraParams map[string]string
-	LocalServerSuccessHTML string
-	LocalServerCertFile    string
-	LocalServerKeyFile     string
-}
-
-type client struct {
-	httpClient           *http.Client
-	provider             *gooidc.Provider
-	oauth2Config         oauth2.Config
-	clock                clock.Interface
-	logger               logger.Interface
-	supportedPKCEMethods []string
-}
-
-func (c *client) wrapContext(ctx context.Context) context.Context {
-	if c.httpClient != nil {
-		ctx = context.WithValue(ctx, oauth2.HTTPClient, c.httpClient)
-	}
-	return ctx
-}
-
-// GetTokenByAuthCode performs the authorization code flow.
-func (c *client) GetTokenByAuthCode(ctx context.Context, in GetTokenByAuthCodeInput, localServerReadyChan chan<- string) (*oidc.TokenSet, error) {
-	ctx = c.wrapContext(ctx)
-	config := oauth2cli.Config{
-		OAuth2Config:           c.oauth2Config,
-		State:                  in.State,
-		AuthCodeOptions:        authorizationRequestOptions(in.Nonce, in.PKCEParams, in.AuthRequestExtraParams),
-		TokenRequestOptions:    tokenRequestOptions(in.PKCEParams),
-		LocalServerBindAddress: in.BindAddress,
-		LocalServerReadyChan:   localServerReadyChan,
-		RedirectURLHostname:    in.RedirectURLHostname,
-		LocalServerSuccessHTML: in.LocalServerSuccessHTML,
-		LocalServerCertFile:    in.LocalServerCertFile,
-		LocalServerKeyFile:     in.LocalServerKeyFile,
-		Logf:                   c.logger.V(1).Infof,
-	}
-	token, err := oauth2cli.GetToken(ctx, config)
-	if err != nil {
-		return nil, fmt.Errorf("oauth2 error: %w", err)
-	}
-	return c.verifyToken(ctx, token, in.Nonce)
-}
-
-// GetAuthCodeURL returns the URL of authentication request for the authorization code flow.
-func (c *client) GetAuthCodeURL(in AuthCodeURLInput) string {
-	cfg := c.oauth2Config
-	cfg.RedirectURL = in.RedirectURI
-	opts := authorizationRequestOptions(in.Nonce, in.PKCEParams, in.AuthRequestExtraParams)
-	return cfg.AuthCodeURL(in.State, opts...)
-}
-
-// ExchangeAuthCode exchanges the authorization code and token.
-func (c *client) ExchangeAuthCode(ctx context.Context, in ExchangeAuthCodeInput) (*oidc.TokenSet, error) {
-	ctx = c.wrapContext(ctx)
-	cfg := c.oauth2Config
-	cfg.RedirectURL = in.RedirectURI
-	opts := tokenRequestOptions(in.PKCEParams)
-	token, err := cfg.Exchange(ctx, in.Code, opts...)
-	if err != nil {
-		return nil, fmt.Errorf("exchange error: %w", err)
-	}
-	return c.verifyToken(ctx, token, in.Nonce)
-}
-
-func authorizationRequestOptions(n string, p pkce.Params, e map[string]string) []oauth2.AuthCodeOption {
-	o := []oauth2.AuthCodeOption{
-		oauth2.AccessTypeOffline,
-		gooidc.Nonce(n),
-	}
-	if !p.IsZero() {
-		o = append(o,
-			oauth2.SetAuthURLParam("code_challenge", p.CodeChallenge),
-			oauth2.SetAuthURLParam("code_challenge_method", p.CodeChallengeMethod),
-		)
-	}
-	for key, value := range e {
-		o = append(o, oauth2.SetAuthURLParam(key, value))
-	}
-	return o
-}
-
-func tokenRequestOptions(p pkce.Params) (o []oauth2.AuthCodeOption) {
-	if !p.IsZero() {
-		o = append(o, oauth2.SetAuthURLParam("code_verifier", p.CodeVerifier))
-	}
-	return
-}
-
-// SupportedPKCEMethods returns the PKCE methods supported by the provider.
-// This may return nil if PKCE is not supported.
-func (c *client) SupportedPKCEMethods() []string {
-	return c.supportedPKCEMethods
-}
-
-// GetTokenByROPC performs the resource owner password credentials flow.
-func (c *client) GetTokenByROPC(ctx context.Context, username, password string) (*oidc.TokenSet, error) {
-	ctx = c.wrapContext(ctx)
-	token, err := c.oauth2Config.PasswordCredentialsToken(ctx, username, password)
-	if err != nil {
-		return nil, fmt.Errorf("resource owner password credentials flow error: %w", err)
-	}
-	return c.verifyToken(ctx, token, "")
-}
-
-// Refresh sends a refresh token request and returns a token set.
-func (c *client) Refresh(ctx context.Context, refreshToken string) (*oidc.TokenSet, error) {
-	ctx = c.wrapContext(ctx)
-	currentToken := &oauth2.Token{
-		Expiry:       time.Now(),
-		RefreshToken: refreshToken,
-	}
-	source := c.oauth2Config.TokenSource(ctx, currentToken)
-	token, err := source.Token()
-	if err != nil {
-		return nil, fmt.Errorf("could not refresh the token: %w", err)
-	}
-	return c.verifyToken(ctx, token, "")
-}
-
-// verifyToken verifies the token with the certificates of the provider and the nonce.
-// If the nonce is an empty string, it does not verify the nonce.
-func (c *client) verifyToken(ctx context.Context, token *oauth2.Token, nonce string) (*oidc.TokenSet, error) {
-	idToken, ok := token.Extra("id_token").(string)
-	if !ok {
-		return nil, fmt.Errorf("id_token is missing in the token response: %s", token)
-	}
-	verifier := c.provider.Verifier(&gooidc.Config{ClientID: c.oauth2Config.ClientID, Now: c.clock.Now})
-	verifiedIDToken, err := verifier.Verify(ctx, idToken)
-	if err != nil {
-		return nil, fmt.Errorf("could not verify the ID token: %w", err)
-	}
-	if nonce != "" && nonce != verifiedIDToken.Nonce {
-		return nil, fmt.Errorf("nonce did not match (wants %s but got %s)", nonce, verifiedIDToken.Nonce)
-	}
-	return &oidc.TokenSet{
-		IDToken:      idToken,
-		RefreshToken: token.RefreshToken,
-	}, nil
-}
--- a/pkg/oidc/client/factory.go
+++ b/pkg/oidc/client/factory.go
@@ -1,87 +0,0 @@
-// Package client provides a client of OpenID Connect.
-package client
-
-import (
-	"context"
-	"fmt"
-	"net/http"
-
-	gooidc "github.com/coreos/go-oidc/v3/oidc"
-	"github.com/google/wire"
-	"github.com/int128/kubelogin/pkg/infrastructure/clock"
-	"github.com/int128/kubelogin/pkg/infrastructure/logger"
-	"github.com/int128/kubelogin/pkg/oidc"
-	"github.com/int128/kubelogin/pkg/oidc/client/logging"
-	"github.com/int128/kubelogin/pkg/tlsclientconfig"
-	"github.com/int128/kubelogin/pkg/tlsclientconfig/loader"
-	"golang.org/x/oauth2"
-)
-
-//go:generate mockgen -destination mock_client/mock_factory.go github.com/int128/kubelogin/pkg/oidc/client FactoryInterface
-
-var Set = wire.NewSet(
-	wire.Struct(new(Factory), "*"),
-	wire.Bind(new(FactoryInterface), new(*Factory)),
-)
-
-type FactoryInterface interface {
-	New(ctx context.Context, p oidc.Provider, tlsClientConfig tlsclientconfig.Config) (Interface, error)
-}
-
-type Factory struct {
-	Loader loader.Loader
-	Clock  clock.Interface
-	Logger logger.Interface
-}
-
-// New returns an instance of infrastructure.Interface with the given configuration.
-func (f *Factory) New(ctx context.Context, p oidc.Provider, tlsClientConfig tlsclientconfig.Config) (Interface, error) {
-	rawTLSClientConfig, err := f.Loader.Load(tlsClientConfig)
-	if err != nil {
-		return nil, fmt.Errorf("could not load the TLS client config: %w", err)
-	}
-	baseTransport := &http.Transport{
-		TLSClientConfig: rawTLSClientConfig,
-		Proxy:           http.ProxyFromEnvironment,
-	}
-	loggingTransport := &logging.Transport{
-		Base:   baseTransport,
-		Logger: f.Logger,
-	}
-	httpClient := &http.Client{
-		Transport: loggingTransport,
-	}
-
-	ctx = context.WithValue(ctx, oauth2.HTTPClient, httpClient)
-	provider, err := gooidc.NewProvider(ctx, p.IssuerURL)
-	if err != nil {
-		return nil, fmt.Errorf("oidc discovery error: %w", err)
-	}
-	supportedPKCEMethods, err := extractSupportedPKCEMethods(provider)
-	if err != nil {
-		return nil, fmt.Errorf("could not determine supported PKCE methods: %w", err)
-	}
-	return &client{
-		httpClient: httpClient,
-		provider:   provider,
-		oauth2Config: oauth2.Config{
-			Endpoint:     provider.Endpoint(),
-			ClientID:     p.ClientID,
-			ClientSecret: p.ClientSecret,
-			Scopes:       append(p.ExtraScopes, gooidc.ScopeOpenID),
-		},
-		clock:                f.Clock,
-		logger:               f.Logger,
-		supportedPKCEMethods: supportedPKCEMethods,
-	}, nil
-}
-
-func extractSupportedPKCEMethods(provider *gooidc.Provider) ([]string, error) {
-	var d struct {
-		CodeChallengeMethodsSupported []string `json:"code_challenge_methods_supported"`
-	}
-	if err := provider.Claims(&d); err != nil {
-		return nil, fmt.Errorf("invalid discovery document: %w", err)
-	}
-	return d.CodeChallengeMethodsSupported, nil
-}
--- a/pkg/oidc/client/logging/transport.go
+++ b/pkg/oidc/client/logging/transport.go
@@ -1,42 +0,0 @@
-package logging
-
-import (
-	"net/http"
-	"net/http/httputil"
-
-	"github.com/int128/kubelogin/pkg/infrastructure/logger"
-)
-
-const (
-	levelDumpHeaders = 2
-	levelDumpBody    = 3
-)
-
-type Transport struct {
-	Base   http.RoundTripper
-	Logger logger.Interface
-}
-
-func (t *Transport) RoundTrip(req *http.Request) (*http.Response, error) {
-	if !t.Logger.IsEnabled(levelDumpHeaders) {
-		return t.Base.RoundTrip(req)
-	}
-
-	reqDump, err := httputil.DumpRequestOut(req, t.Logger.IsEnabled(levelDumpBody))
-	if err != nil {
-		t.Logger.V(levelDumpHeaders).Infof("could not dump the request: %s", err)
-		return t.Base.RoundTrip(req)
-	}
-	t.Logger.V(levelDumpHeaders).Infof("%s", string(reqDump))
-	resp, err := t.Base.RoundTrip(req)
-	if err != nil {
-		return resp, err
-	}
-	respDump, err := httputil.DumpResponse(resp, t.Logger.IsEnabled(levelDumpBody))
-	if err != nil {
-		t.Logger.V(levelDumpHeaders).Infof("could not dump the response: %s", err)
-		return resp, err
-	}
-	t.Logger.V(levelDumpHeaders).Infof("%s", string(respDump))
-	return resp, err
-}
--- a/pkg/oidc/client/logging/transport_test.go
+++ b/pkg/oidc/client/logging/transport_test.go
@@ -1,49 +0,0 @@
-package logging
-
-import (
-	"bufio"
-	"net/http"
-	"net/http/httptest"
-	"strings"
-	"testing"
-
-	"github.com/golang/mock/gomock"
-	"github.com/int128/kubelogin/pkg/testing/logger"
-)
-
-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()
-
-	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 := &Transport{
-		Base:   &mockTransport{resp: resp},
-		Logger: logger.New(t),
-	}
-	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)
-	}
-}
--- a/pkg/oidc/client/mock_client/mock_client.go
+++ b/pkg/oidc/client/mock_client/mock_client.go
@@ -1,124 +0,0 @@
-// Code generated by MockGen. DO NOT EDIT.
-// Source: github.com/int128/kubelogin/pkg/oidc/client (interfaces: Interface)
-
-// Package mock_client is a generated GoMock package.
-package mock_client
-
-import (
-	context "context"
-	gomock "github.com/golang/mock/gomock"
-	oidc "github.com/int128/kubelogin/pkg/oidc"
-	client "github.com/int128/kubelogin/pkg/oidc/client"
-	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
-}
-
-// ExchangeAuthCode mocks base method
-func (m *MockInterface) ExchangeAuthCode(arg0 context.Context, arg1 client.ExchangeAuthCodeInput) (*oidc.TokenSet, error) {
-	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "ExchangeAuthCode", arg0, arg1)
-	ret0, _ := ret[0].(*oidc.TokenSet)
-	ret1, _ := ret[1].(error)
-	return ret0, ret1
-}
-
-// ExchangeAuthCode indicates an expected call of ExchangeAuthCode
-func (mr *MockInterfaceMockRecorder) ExchangeAuthCode(arg0, arg1 interface{}) *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "ExchangeAuthCode", reflect.TypeOf((*MockInterface)(nil).ExchangeAuthCode), arg0, arg1)
-}
-
-// GetAuthCodeURL mocks base method
-func (m *MockInterface) GetAuthCodeURL(arg0 client.AuthCodeURLInput) string {
-	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "GetAuthCodeURL", arg0)
-	ret0, _ := ret[0].(string)
-	return ret0
-}
-
-// GetAuthCodeURL indicates an expected call of GetAuthCodeURL
-func (mr *MockInterfaceMockRecorder) GetAuthCodeURL(arg0 interface{}) *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "GetAuthCodeURL", reflect.TypeOf((*MockInterface)(nil).GetAuthCodeURL), arg0)
-}
-
-// GetTokenByAuthCode mocks base method
-func (m *MockInterface) GetTokenByAuthCode(arg0 context.Context, arg1 client.GetTokenByAuthCodeInput, arg2 chan<- string) (*oidc.TokenSet, error) {
-	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "GetTokenByAuthCode", arg0, arg1, arg2)
-	ret0, _ := ret[0].(*oidc.TokenSet)
-	ret1, _ := ret[1].(error)
-	return ret0, ret1
-}
-
-// GetTokenByAuthCode indicates an expected call of GetTokenByAuthCode
-func (mr *MockInterfaceMockRecorder) GetTokenByAuthCode(arg0, arg1, arg2 interface{}) *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "GetTokenByAuthCode", reflect.TypeOf((*MockInterface)(nil).GetTokenByAuthCode), arg0, arg1, arg2)
-}
-
-// GetTokenByROPC mocks base method
-func (m *MockInterface) GetTokenByROPC(arg0 context.Context, arg1, arg2 string) (*oidc.TokenSet, error) {
-	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "GetTokenByROPC", arg0, arg1, arg2)
-	ret0, _ := ret[0].(*oidc.TokenSet)
-	ret1, _ := ret[1].(error)
-	return ret0, ret1
-}
-
-// GetTokenByROPC indicates an expected call of GetTokenByROPC
-func (mr *MockInterfaceMockRecorder) GetTokenByROPC(arg0, arg1, arg2 interface{}) *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "GetTokenByROPC", reflect.TypeOf((*MockInterface)(nil).GetTokenByROPC), arg0, arg1, arg2)
-}
-
-// Refresh mocks base method
-func (m *MockInterface) Refresh(arg0 context.Context, arg1 string) (*oidc.TokenSet, error) {
-	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "Refresh", arg0, arg1)
-	ret0, _ := ret[0].(*oidc.TokenSet)
-	ret1, _ := ret[1].(error)
-	return ret0, ret1
-}
-
-// Refresh indicates an expected call of Refresh
-func (mr *MockInterfaceMockRecorder) Refresh(arg0, arg1 interface{}) *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Refresh", reflect.TypeOf((*MockInterface)(nil).Refresh), arg0, arg1)
-}
-
-// SupportedPKCEMethods mocks base method
-func (m *MockInterface) SupportedPKCEMethods() []string {
-	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "SupportedPKCEMethods")
-	ret0, _ := ret[0].([]string)
-	return ret0
-}
-
-// SupportedPKCEMethods indicates an expected call of SupportedPKCEMethods
-func (mr *MockInterfaceMockRecorder) SupportedPKCEMethods() *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "SupportedPKCEMethods", reflect.TypeOf((*MockInterface)(nil).SupportedPKCEMethods))
-}
--- a/pkg/oidc/client/mock_client/mock_factory.go
+++ b/pkg/oidc/client/mock_client/mock_factory.go
@@ -1,52 +0,0 @@
-// Code generated by MockGen. DO NOT EDIT.
-// Source: github.com/int128/kubelogin/pkg/oidc/client (interfaces: FactoryInterface)
-
-// Package mock_client is a generated GoMock package.
-package mock_client
-
-import (
-	context "context"
-	gomock "github.com/golang/mock/gomock"
-	oidc "github.com/int128/kubelogin/pkg/oidc"
-	client "github.com/int128/kubelogin/pkg/oidc/client"
-	tlsclientconfig "github.com/int128/kubelogin/pkg/tlsclientconfig"
-	reflect "reflect"
-)
-
-// MockFactoryInterface is a mock of FactoryInterface interface
-type MockFactoryInterface struct {
-	ctrl     *gomock.Controller
-	recorder *MockFactoryInterfaceMockRecorder
-}
-
-// MockFactoryInterfaceMockRecorder is the mock recorder for MockFactoryInterface
-type MockFactoryInterfaceMockRecorder struct {
-	mock *MockFactoryInterface
-}
-
-// NewMockFactoryInterface creates a new mock instance
-func NewMockFactoryInterface(ctrl *gomock.Controller) *MockFactoryInterface {
-	mock := &MockFactoryInterface{ctrl: ctrl}
-	mock.recorder = &MockFactoryInterfaceMockRecorder{mock}
-	return mock
-}
-
-// EXPECT returns an object that allows the caller to indicate expected use
-func (m *MockFactoryInterface) EXPECT() *MockFactoryInterfaceMockRecorder {
-	return m.recorder
-}
-
-// New mocks base method
-func (m *MockFactoryInterface) New(arg0 context.Context, arg1 oidc.Provider, arg2 tlsclientconfig.Config) (client.Interface, error) {
-	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "New", arg0, arg1, arg2)
-	ret0, _ := ret[0].(client.Interface)
-	ret1, _ := ret[1].(error)
-	return ret0, ret1
-}
-
-// New indicates an expected call of New
-func (mr *MockFactoryInterfaceMockRecorder) New(arg0, arg1, arg2 interface{}) *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "New", reflect.TypeOf((*MockFactoryInterface)(nil).New), arg0, arg1, arg2)
-}
--- a/pkg/oidc/oidc.go
+++ b/pkg/oidc/oidc.go
@@ -1,56 +0,0 @@
-package oidc
-
-import (
-	"crypto/rand"
-	"encoding/base64"
-	"encoding/binary"
-	"fmt"
-
-	"github.com/int128/kubelogin/pkg/jwt"
-)
-
-// Provider represents an OIDC provider.
-type Provider struct {
-	IssuerURL    string
-	ClientID     string
-	ClientSecret string   // optional
-	ExtraScopes  []string // optional
-}
-
-// TokenSet represents a set of ID token and refresh token.
-type TokenSet struct {
-	IDToken      string
-	RefreshToken string
-}
-
-func (ts TokenSet) DecodeWithoutVerify() (*jwt.Claims, error) {
-	return jwt.DecodeWithoutVerify(ts.IDToken)
-}
-
-func NewState() (string, error) {
-	b, err := random32()
-	if err != nil {
-		return "", fmt.Errorf("could not generate a random: %w", err)
-	}
-	return base64URLEncode(b), nil
-}
-
-func NewNonce() (string, error) {
-	b, err := random32()
-	if err != nil {
-		return "", fmt.Errorf("could not generate a random: %w", err)
-	}
-	return base64URLEncode(b), nil
-}
-
-func random32() ([]byte, error) {
-	b := make([]byte, 32)
-	if err := binary.Read(rand.Reader, binary.LittleEndian, b); err != nil {
-		return nil, fmt.Errorf("read error: %w", err)
-	}
-	return b, nil
-}
-
-func base64URLEncode(b []byte) string {
-	return base64.URLEncoding.WithPadding(base64.NoPadding).EncodeToString(b)
-}
--- a/pkg/pkce/pkce.go
+++ b/pkg/pkce/pkce.go
@@ -1,73 +0,0 @@
-// Package pkce provides generation of the PKCE parameters.
-// See also https://tools.ietf.org/html/rfc7636.
-package pkce
-
-import (
-	"crypto/rand"
-	"crypto/sha256"
-	"encoding/base64"
-	"encoding/binary"
-	"fmt"
-)
-
-var Plain Params
-
-const (
-	// code challenge methods defined as https://tools.ietf.org/html/rfc7636#section-4.3
-	methodS256 = "S256"
-)
-
-// Params represents a set of the PKCE parameters.
-type Params struct {
-	CodeChallenge       string
-	CodeChallengeMethod string
-	CodeVerifier        string
-}
-
-func (p Params) IsZero() bool {
-	return p == Params{}
-}
-
-// New returns a parameters supported by the provider.
-// You need to pass the code challenge methods defined in RFC7636.
-// It returns Plain if no method is available.
-func New(methods []string) (Params, error) {
-	for _, method := range methods {
-		if method == methodS256 {
-			return NewS256()
-		}
-	}
-	return Plain, nil
-}
-
-// NewS256 generates a parameters for S256.
-func NewS256() (Params, error) {
-	b, err := random32()
-	if err != nil {
-		return Plain, fmt.Errorf("could not generate a random: %w", err)
-	}
-	return computeS256(b), nil
-}
-
-func random32() ([]byte, error) {
-	b := make([]byte, 32)
-	if err := binary.Read(rand.Reader, binary.LittleEndian, b); err != nil {
-		return nil, fmt.Errorf("read error: %w", err)
-	}
-	return b, nil
-}
-
-func computeS256(b []byte) Params {
-	v := base64URLEncode(b)
-	s := sha256.New()
-	_, _ = s.Write([]byte(v))
-	return Params{
-		CodeChallenge:       base64URLEncode(s.Sum(nil)),
-		CodeChallengeMethod: methodS256,
-		CodeVerifier:        v,
-	}
-}
-
-func base64URLEncode(b []byte) string {
-	return base64.URLEncoding.WithPadding(base64.NoPadding).EncodeToString(b)
-}
--- a/pkg/pkce/pkce_test.go
+++ b/pkg/pkce/pkce_test.go
@@ -1,61 +0,0 @@
-package pkce
-
-import (
-	"testing"
-)
-
-func TestNew(t *testing.T) {
-	t.Run("S256", func(t *testing.T) {
-		p, err := New([]string{"plain", "S256"})
-		if err != nil {
-			t.Fatalf("New error: %s", err)
-		}
-		if p.CodeChallengeMethod != "S256" {
-			t.Errorf("CodeChallengeMethod wants S256 but was %s", p.CodeChallengeMethod)
-		}
-		if p.CodeChallenge == "" {
-			t.Errorf("CodeChallenge wants non-empty but was empty")
-		}
-		if p.CodeVerifier == "" {
-			t.Errorf("CodeVerifier wants non-empty but was empty")
-		}
-	})
-	t.Run("plain", func(t *testing.T) {
-		p, err := New([]string{"plain"})
-		if err != nil {
-			t.Fatalf("New error: %s", err)
-		}
-		if !p.IsZero() {
-			t.Errorf("IsZero wants true but was false")
-		}
-	})
-	t.Run("nil", func(t *testing.T) {
-		p, err := New(nil)
-		if err != nil {
-			t.Fatalf("New error: %s", err)
-		}
-		if !p.IsZero() {
-			t.Errorf("IsZero wants true but was false")
-		}
-	})
-}
-
-func Test_computeS256(t *testing.T) {
-	// Testdata described at:
-	// https://tools.ietf.org/html/rfc7636#appendix-B
-	b := []byte{
-		116, 24, 223, 180, 151, 153, 224, 37, 79, 250, 96, 125, 216, 173,
-		187, 186, 22, 212, 37, 77, 105, 214, 191, 240, 91, 88, 5, 88, 83,
-		132, 141, 121,
-	}
-	p := computeS256(b)
-	if want := "dBjftJeZ4CVP-mB92K27uhbUJU1p1r_wW1gFWFOEjXk"; want != p.CodeVerifier {
-		t.Errorf("CodeVerifier wants %s but was %s", want, p.CodeVerifier)
-	}
-	if want := "E9Melhoa2OwvFrEMTJguCHaoeK1t8URWbuGJSstw-cM"; want != p.CodeChallenge {
-		t.Errorf("CodeChallenge wants %s but was %s", want, p.CodeChallenge)
-	}
-	if p.CodeChallengeMethod != "S256" {
-		t.Errorf("CodeChallengeMethod wants S256 but was %s", p.CodeChallengeMethod)
-	}
-}
--- a/pkg/testing/clock/clock.go
+++ b/pkg/testing/clock/clock.go
@@ -1,9 +0,0 @@
-package clock
-
-import "time"
-
-type Fake time.Time
-
-func (f Fake) Now() time.Time {
-	return time.Time(f)
-}
--- a/pkg/testing/httpserver/httpserver.go
+++ b/pkg/testing/httpserver/httpserver.go
@@ -1,29 +0,0 @@
-package main
-
-import (
-	"log"
-	"net/http"
-
-	"github.com/int128/kubelogin/pkg/usecases/authentication/authcode"
-)
-
-func main() {
-	http.HandleFunc("/BrowserSuccessHTML", func(w http.ResponseWriter, r *http.Request) {
-		w.Header().Add("content-type", "text/html")
-		_, _ = w.Write([]byte(authcode.BrowserSuccessHTML))
-	})
-	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
-		w.Header().Add("content-type", "text/html")
-		_, _ = w.Write([]byte(`
-<html>
-<body>
-<ul>
-<li><a href="BrowserSuccessHTML">BrowserSuccessHTML</a></li>
-</ul>
-</body>
-</html>
-`))
-	})
-	log.Printf("http://localhost:8000")
-	log.Fatal(http.ListenAndServe("127.0.0.1:8000", nil))
-}
--- a/Show More
+++ b/Show More