Release v1.11.0

Bump to int128/oauth2cli:v1.4.0 (#82 )
Add fallback ports for local server (#79 )
2026-02-23 21:44:03 +00:00 · 2019-05-16 21:59:50 +09:00 · 2019-05-16 21:55:56 +09:00 · 2019-05-16 20:38:45 +09:00 · 2019-05-14 15:42:05 +09:00 · 2019-05-14 13:49:43 +09:00
55 changed files with 3522 additions and 465 deletions
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -2,35 +2,37 @@ version: 2
 jobs:
  build:
    docker:
-      - image: circleci/golang:1.10
-    working_directory: /go/src/github.com/int128/kubelogin
+      - image: circleci/golang:1.12.3
    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: |
+          mkdir -p ~/bin
+          echo 'export PATH="$HOME/bin:$PATH"' >> $BASH_ENV
+      - run: |
+          curl -L -o ~/bin/kubectl https://storage.googleapis.com/kubernetes-release/release/v1.14.0/bin/linux/amd64/kubectl
+          chmod +x ~/bin/kubectl
+      - run: |
+          curl -L -o ~/bin/ghcp https://github.com/int128/ghcp/releases/download/v1.3.0/ghcp_linux_amd64
+          chmod +x ~/bin/ghcp
+      - run: |
+          curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | sh -s -- -b ~/bin v1.16.0
+      - run: go get github.com/int128/goxzst
      - run: go get github.com/tcnksm/ghr
-      - run: gox --osarch 'darwin/amd64 linux/amd64 windows/amd64 windows/386' -output 'dist/{{.Dir}}_{{.OS}}_{{.Arch}}'
-      - run: ghr -u "$CIRCLE_PROJECT_USERNAME" -r "$CIRCLE_PROJECT_REPONAME" "$CIRCLE_TAG" dist
+      - checkout
+      # workaround for https://github.com/golang/go/issues/27925
+      - run: sed -e '/^k8s.io\/client-go /d' -i go.sum
+      - run: make check
+      - run: make run
+      - run: |
+          if [ "$CIRCLE_TAG" ]; then
+            make release
+          fi

 workflows:
  version: 2
-  build:
+  all:
    jobs:
-      - build
-      - release:
+      - build:
+          context: open-source
          filters:
-            branches:
-              ignore: /.*/
            tags:
              only: /.*/
--- a/.editorconfig
+++ b/.editorconfig
@@ -1,11 +0,0 @@
-root = true
-
-[*]
-end_of_line = lf
-insert_final_newline = true
-indent_style = space
-indent_size = 2
-
-[*.go]
-indent_style = tab
-indent_size = 4
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,5 @@
+/.idea
+/dist
 /kubelogin
-/.kubeconfig
+/kubectl-oidc_login
+/.kubeconfig*
--- a/35
+++ b/35
@@ -0,0 +1,35 @@
+TARGET := kubelogin
+TARGET_PLUGIN := kubectl-oidc_login
+CIRCLE_TAG ?= HEAD
+LDFLAGS := -X main.version=$(CIRCLE_TAG)
+
+.PHONY: check run release clean
+
+all: $(TARGET)
+
+check:
+	golangci-lint run
+	$(MAKE) -C adaptors_test/keys/testdata
+	go test -v -race ./...
+
+$(TARGET): $(wildcard *.go)
+	go build -o $@ -ldflags "$(LDFLAGS)"
+
+$(TARGET_PLUGIN): $(TARGET)
+	ln -sf $(TARGET) $@
+
+run: $(TARGET_PLUGIN)
+	-PATH=.:$(PATH) kubectl oidc-login --help
+
+dist:
+	VERSION=$(CIRCLE_TAG) goxzst -d dist/gh/ -o "$(TARGET)" -t "kubelogin.rb oidc-login.yaml" -- -ldflags "$(LDFLAGS)"
+	mv dist/gh/kubelogin.rb dist/
+
+release: dist
+	ghr -u "$(CIRCLE_PROJECT_USERNAME)" -r "$(CIRCLE_PROJECT_REPONAME)" "$(CIRCLE_TAG)" dist/gh/
+	ghcp -u "$(CIRCLE_PROJECT_USERNAME)" -r "homebrew-$(CIRCLE_PROJECT_REPONAME)" -m "$(CIRCLE_TAG)" -C dist/ kubelogin.rb
+
+clean:
+	-rm $(TARGET)
+	-rm $(TARGET_PLUGIN)
+	-rm -r dist/
--- a/README.md
+++ b/README.md
@@ -1,153 +1,160 @@
 # kubelogin [![CircleCI](https://circleci.com/gh/int128/kubelogin.svg?style=shield)](https://circleci.com/gh/int128/kubelogin)

-`kubelogin` is a command to get an OpenID Connect (OIDC) token for `kubectl` authentication.
+This is a kubectl plugin for [Kubernetes OpenID Connect (OIDC) authentication](https://kubernetes.io/docs/reference/access-authn-authz/authentication/#openid-connect-tokens).
+It updates the kubeconfig file with an ID token and refresh token got from the OIDC provider.


 ## Getting Started

-Download [the latest release](https://github.com/int128/kubelogin/releases) and save it as `/usr/local/bin/kubelogin`.
+You need to setup the following components:

-You have to configure `kubectl` to authenticate with OIDC.
-See the later section for details.
+- OIDC provider
+- Kubernetes API server
+- Role for your group or user
+- kubectl authentication
+
+You can install the latest release from [Homebrew](https://brew.sh/), [Krew](https://github.com/kubernetes-sigs/krew) or [GitHub Releases](https://github.com/int128/kubelogin/releases) as follows:

 ```sh
-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
+# Homebrew
+brew tap int128/kubelogin
+brew install kubelogin
+
+# Krew
+kubectl krew install oidc-login
+
+# GitHub Releases
+curl -LO https://github.com/int128/kubelogin/releases/download/v1.11.0/kubelogin_linux_amd64.zip
+unzip kubelogin_linux_amd64.zip
+ln -s kubelogin kubectl-oidc_login
 ```

-Run `kubelogin`.
+After initial setup or when the token has been expired, just run:

 ```
 % kubelogin
-2018/08/10 10:36:38 Reading .kubeconfig
-2018/08/10 10:36:38 Using current context: devops.hidetake.org
-2018/08/10 10:36:41 Open http://localhost:8000 for authorization
-2018/08/10 10:36:45 GET /
-2018/08/10 10:37:07 GET /?state=...&session_state=...&code=ey...
-2018/08/10 10:37:08 Updated .kubeconfig
+Open http://localhost:8000 for authentication
+You got a valid token until 2019-05-16 22:03:13 +0900 JST
+Updated ~/.kubeconfig
 ```

-Now your `~/.kube/config` looks like:
-
-```yaml
-# ~/.kube/config (snip)
-users:
- name: hello.k8s.local
-  user:
-    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 here
-        refresh-token: ey...  # kubelogin will update refresh token here
-      name: oidc
-```
-
-Make sure you can access to the Kubernetes cluster:
+or run as a kubectl plugin:

 ```
-% kubectl version
-Client Version: version.Info{...}
-Server Version: version.Info{...}
+% kubectl oidc-login
 ```

+It opens the browser and you can log in to the provider.
+After authentication, it gets an ID token and refresh token and writes them to the kubeconfig.
+
+For more, see the following documents:
+
+- [Getting Started with Keycloak](docs/keycloak.md)
+- [Getting Started with Google Identity Platform](docs/google.md)
+- [Team Operation](docs/team_ops.md)
+
+If you are using other platforms, please contribute documents via pull requests.
+

 ## Configuration

-You can set the following environment variable:
+This document is for the development version.
+If you are looking for a specific version, see [the release tags](https://github.com/int128/kubelogin/tags).

- `KUBECONFIG` - Path to the config. Defaults to `~/.kube/config`.
+Kubelogin supports the following options.

-
-## Prerequisite
-
-You have to setup your OIDC identity provider and Kubernetes cluster.
-
-### 1. Setup OIDC Identity Provider
-
-This tutorial assumes you have created an OIDC client with the following:
-
- Issuer URL: `https://keycloak.example.com/auth/realms/hello`
- Client ID: `kubernetes`
- Client Secret: `YOUR_CLIENT_SECRET`
- Allowed redirect URLs: `http://localhost:8000/`
- Groups claim: `groups` (optional for group based access controll)
-
-### 2. Setup Kubernetes API Server
-
-Configure the Kubernetes API server allows your identity provider.
-
-If you are using [kops](https://github.com/kubernetes/kops), `kops edit cluster` and append the following settings:
-
-```yaml
-spec:
-  kubeAPIServer:
-    oidcClientID: kubernetes
-    oidcGroupsClaim: groups
-    oidcIssuerURL: https://keycloak.example.com/auth/realms/hello
+```
+Options:
+      --kubeconfig string              Path to the kubeconfig file
+      --context string                 The name of the kubeconfig context to use
+      --user string                    The name of the kubeconfig user to use. Prior to --context
+      --listen-port ints               Port to bind to the local server. If multiple ports are given, it will try the ports in order (default [8000,18000])
+      --skip-open-browser              If true, it does not open the browser on authentication
+      --certificate-authority string   Path to a cert file for the certificate authority
+      --insecure-skip-tls-verify       If true, the server's certificate will not be checked for validity. This will make your HTTPS connections insecure
+  -v, --v int                          If set to 1 or greater, it shows debug log
 ```

-### 3. Setup kubectl
+It supports the following keys of `auth-provider` in a kubeconfig.
+See [kubectl authentication](https://kubernetes.io/docs/reference/access-authn-authz/authentication/#using-kubectl) for more.

-Run the following command to configure `kubectl` to authenticate by your identity provider.
+Key | Direction | Value
+----|-----------|------
+`idp-issuer-url`                  | Read (Mandatory) | Issuer URL of the provider.
+`client-id`                       | Read (Mandatory) | Client ID of the provider.
+`client-secret`                   | Read (Mandatory) | Client Secret of the provider.
+`idp-certificate-authority`       | Read | CA certificate path of the provider.
+`idp-certificate-authority-data`  | Read | Base64 encoded CA certificate of the provider.
+`extra-scopes`                    | Read | Scopes to request to the provider (comma separated).
+`id-token`                        | Write | ID token got from the provider.
+`refresh-token`                   | Write | Refresh token got from the provider.
+
+
+### Kubeconfig
+
+You can set path to the kubeconfig file by the option or the environment variable just like kubectl.
+It defaults to `~/.kube/config`.

 ```sh
-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
+# by the option
+kubelogin --kubeconfig /path/to/kubeconfig
+
+# by the environment variable
+KUBECONFIG="/path/to/kubeconfig1:/path/to/kubeconfig2" kubelogin
 ```

-In actual team operation, you can share the following config to your team members for easy setup.
+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.

-```yaml
-#!/bin/sh
-CLUSTER_NAME="hello.k8s.local"

-# Set the certificate
-mkdir -p "$HOME/.kube"
-cat > "$HOME/.kube/$CLUSTER_NAME.crt" <<EOF
-----BEGIN CERTIFICATE-----
-MII...
-----END CERTIFICATE-----
-EOF
+### Extra scopes

-# Set the cluster
-kubectl config set-cluster "$CLUSTER_NAME" \
-  --server https://api-xxx.xxx.elb.amazonaws.com \
-  --certificate-authority "$HOME/.kube/$CLUSTER_NAME.crt"
+You can set extra scopes to request to the provider by `extra-scopes` in the kubeconfig.

-# Set the credentials
-kubectl config set-credentials "$CLUSTER_NAME" \
-  --auth-provider oidc \
-  --auth-provider-arg idp-issuer-url=https://keycloak.example.com/auth/realms/hello \
-  --auth-provider-arg client-id=kubernetes \
-  --auth-provider-arg client-secret=YOUR_SECRET
-
-# Set the context
-kubectl config set-context "$CLUSTER_NAME" --cluster "$CLUSTER_NAME" --user "$CLUSTER_NAME"
-
-# Set the current context
-kubectl config use-context "$CLUSTER_NAME"
+```sh
+kubectl config set-credentials keycloak --auth-provider-arg extra-scopes=email
 ```

+Note that kubectl does not accept multiple scopes and 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/ $KUBECONFIG
+```
+
+
+### Redirect URIs
+
+By default kubelogin starts the local server at port 8000 or 18000.
+You need to register the following redirect URIs to the OIDC provider:
+
+- `http://localhost:8000`
+- `http://localhost:18000` (used if port 8000 is already in use)
+
+You can change the ports by the option:
+
+```sh
+kubelogin --listen-port 12345 --listen-port 23456
+```
+
+
+### CA Certificates
+
+You can set your self-signed certificates for the OIDC provider (not Kubernetes API server) by kubeconfig or option.
+
+```sh
+kubectl config set-credentials keycloak \
+  --auth-provider-arg idp-certificate-authority=$HOME/.kube/keycloak-ca.pem
+```
+
+
+### HTTP Proxy
+
+You can set the following environment variables if you are behind a proxy: `HTTP_PROXY`, `HTTPS_PROXY` and `NO_PROXY`.
+See also [net/http#ProxyFromEnvironment](https://golang.org/pkg/net/http/#ProxyFromEnvironment).
+

 ## Contributions

 This is an open source software licensed under Apache License 2.0.
-Feel free to open issues and pull requests.

-### Build
-
-```sh
-go get github.com/int128/kubelogin
-```
-
-### Release
-
-CircleCI publishes the build to GitHub. See [.circleci/config.yml](.circleci/config.yml).
+Feel free to open issues and pull requests for improving code and documents.
--- a/adaptors/cmd.go
+++ b/adaptors/cmd.go
@@ -0,0 +1,100 @@
+package adaptors
+
+import (
+	"context"
+	"strings"
+
+	"github.com/int128/kubelogin/adaptors/interfaces"
+	"github.com/int128/kubelogin/kubeconfig"
+	"github.com/int128/kubelogin/usecases/interfaces"
+	"github.com/spf13/pflag"
+	"go.uber.org/dig"
+)
+
+const usage = `Login to the OpenID Connect provider and update the kubeconfig.
+kubelogin %[2]s
+
+Examples:
+  # Login to the current provider and update ~/.kube/config
+  %[1]s
+
+Options:
+%[3]s
+Usage:
+  %[1]s [options]`
+
+var defaultListenPort = []int{8000, 18000}
+
+func NewCmd(i Cmd) adaptors.Cmd {
+	return &i
+}
+
+type Cmd struct {
+	dig.In
+	Login  usecases.Login
+	Logger adaptors.Logger
+}
+
+func (cmd *Cmd) Run(ctx context.Context, args []string, version string) int {
+	executable := executableName(args[0])
+	f := pflag.NewFlagSet(executable, pflag.ContinueOnError)
+	f.SortFlags = false
+	f.Usage = func() {
+		cmd.Logger.Printf(usage, executable, version, f.FlagUsages())
+	}
+	var o cmdOptions
+	f.StringVar(&o.KubeConfig, "kubeconfig", "", "Path to the kubeconfig file")
+	f.StringVar(&o.KubeContext, "context", "", "The name of the kubeconfig context to use")
+	f.StringVar(&o.KubeUser, "user", "", "The name of the kubeconfig user to use. Prior to --context")
+	f.IntSliceVar(&o.ListenPort, "listen-port", defaultListenPort, "Port to bind to the local server. If multiple ports are given, it will try the ports in order")
+	f.BoolVar(&o.SkipOpenBrowser, "skip-open-browser", false, "If true, it does not open the browser on authentication")
+	f.StringVar(&o.CertificateAuthority, "certificate-authority", "", "Path to a cert file for the certificate authority")
+	f.BoolVar(&o.SkipTLSVerify, "insecure-skip-tls-verify", false, "If true, the server's certificate will not be checked for validity. This will make your HTTPS connections insecure")
+	f.IntVarP(&o.Verbose, "v", "v", 0, "If set to 1 or greater, it shows debug log")
+
+	if err := f.Parse(args[1:]); err != nil {
+		if err == pflag.ErrHelp {
+			return 1
+		}
+		cmd.Logger.Printf("Error: invalid arguments: %s", err)
+		return 1
+	}
+	if len(f.Args()) > 0 {
+		cmd.Logger.Printf("Error: too many arguments")
+		return 1
+	}
+
+	cmd.Logger.SetLevel(adaptors.LogLevel(o.Verbose))
+	in := usecases.LoginIn{
+		KubeConfigFilename:           o.KubeConfig,
+		KubeContextName:              kubeconfig.ContextName(o.KubeContext),
+		KubeUserName:                 kubeconfig.UserName(o.KubeUser),
+		CertificateAuthorityFilename: o.CertificateAuthority,
+		SkipTLSVerify:                o.SkipTLSVerify,
+		ListenPort:                   o.ListenPort,
+		SkipOpenBrowser:              o.SkipOpenBrowser,
+	}
+	if err := cmd.Login.Do(ctx, in); err != nil {
+		cmd.Logger.Printf("Error: %s", err)
+		return 1
+	}
+	return 0
+}
+
+type cmdOptions struct {
+	KubeConfig           string
+	KubeContext          string
+	KubeUser             string
+	CertificateAuthority string
+	SkipTLSVerify        bool
+	ListenPort           []int
+	SkipOpenBrowser      bool
+	Verbose              int
+}
+
+func executableName(arg0 string) string {
+	if strings.HasPrefix(arg0, "kubectl-") {
+		return strings.ReplaceAll(strings.ReplaceAll(arg0, "-", " "), "_", "-")
+	}
+	return arg0
+}
--- a/adaptors/cmd_test.go
+++ b/adaptors/cmd_test.go
@@ -0,0 +1,111 @@
+package adaptors
+
+import (
+	"context"
+	"testing"
+
+	"github.com/golang/mock/gomock"
+	"github.com/int128/kubelogin/adaptors/interfaces"
+	"github.com/int128/kubelogin/adaptors/mock_adaptors"
+	"github.com/int128/kubelogin/usecases/interfaces"
+	"github.com/int128/kubelogin/usecases/mock_usecases"
+)
+
+func TestCmd_Run(t *testing.T) {
+	const executable = "kubelogin"
+	const version = "HEAD"
+
+	t.Run("Defaults", func(t *testing.T) {
+		ctrl := gomock.NewController(t)
+		defer ctrl.Finish()
+		ctx := context.TODO()
+
+		login := mock_usecases.NewMockLogin(ctrl)
+		login.EXPECT().
+			Do(ctx, usecases.LoginIn{
+				ListenPort: defaultListenPort,
+			})
+
+		logger := mock_adaptors.NewLogger(t, ctrl)
+		logger.EXPECT().
+			SetLevel(adaptors.LogLevel(0))
+
+		cmd := Cmd{
+			Login:  login,
+			Logger: logger,
+		}
+		exitCode := cmd.Run(ctx, []string{executable}, version)
+		if exitCode != 0 {
+			t.Errorf("exitCode wants 0 but %d", exitCode)
+		}
+	})
+
+	t.Run("FullOptions", func(t *testing.T) {
+		ctrl := gomock.NewController(t)
+		defer ctrl.Finish()
+		ctx := context.TODO()
+
+		login := mock_usecases.NewMockLogin(ctrl)
+		login.EXPECT().
+			Do(ctx, usecases.LoginIn{
+				KubeConfigFilename:           "/path/to/kubeconfig",
+				KubeContextName:              "hello.k8s.local",
+				KubeUserName:                 "google",
+				CertificateAuthorityFilename: "/path/to/cacert",
+				SkipTLSVerify:                true,
+				ListenPort:                   []int{10080, 20080},
+				SkipOpenBrowser:              true,
+			})
+
+		logger := mock_adaptors.NewLogger(t, ctrl)
+		logger.EXPECT().
+			SetLevel(adaptors.LogLevel(1))
+
+		cmd := Cmd{
+			Login:  login,
+			Logger: logger,
+		}
+		exitCode := cmd.Run(ctx, []string{executable,
+			"--kubeconfig", "/path/to/kubeconfig",
+			"--context", "hello.k8s.local",
+			"--user", "google",
+			"--listen-port", "10080",
+			"--listen-port", "20080",
+			"--skip-open-browser",
+			"--certificate-authority", "/path/to/cacert",
+			"--insecure-skip-tls-verify",
+			"-v1",
+		}, version)
+		if exitCode != 0 {
+			t.Errorf("exitCode wants 0 but %d", exitCode)
+		}
+	})
+
+	t.Run("TooManyArgs", func(t *testing.T) {
+		ctrl := gomock.NewController(t)
+		defer ctrl.Finish()
+		cmd := Cmd{
+			Login:  mock_usecases.NewMockLogin(ctrl),
+			Logger: mock_adaptors.NewLogger(t, ctrl),
+		}
+		exitCode := cmd.Run(context.TODO(), []string{executable, "some"}, version)
+		if exitCode != 1 {
+			t.Errorf("exitCode wants 1 but %d", exitCode)
+		}
+	})
+}
+
+func TestCmd_executableName(t *testing.T) {
+	t.Run("kubelogin", func(t *testing.T) {
+		e := executableName("kubelogin")
+		if e != "kubelogin" {
+			t.Errorf("executableName wants kubelogin but %s", e)
+		}
+	})
+	t.Run("kubectl-oidc_login", func(t *testing.T) {
+		e := executableName("kubectl-oidc_login")
+		if e != "kubectl oidc-login" {
+			t.Errorf("executableName wants kubectl oidc-login but %s", e)
+		}
+	})
+}
--- a/adaptors/http.go
+++ b/adaptors/http.go
@@ -0,0 +1,85 @@
+package adaptors
+
+import (
+	"crypto/tls"
+	"crypto/x509"
+	"encoding/base64"
+	"io/ioutil"
+	"net/http"
+
+	"github.com/int128/kubelogin/adaptors/interfaces"
+	"github.com/int128/kubelogin/infrastructure"
+	"github.com/pkg/errors"
+	"go.uber.org/dig"
+)
+
+func NewHTTP(i HTTP) adaptors.HTTP {
+	return &i
+}
+
+type HTTP struct {
+	dig.In
+	Logger adaptors.Logger
+}
+
+func (h *HTTP) NewClient(config adaptors.HTTPClientConfig) (*http.Client, error) {
+	pool := x509.NewCertPool()
+	if filename := config.OIDCConfig.IDPCertificateAuthority(); filename != "" {
+		h.Logger.Debugf(1, "Loading the certificate %s", filename)
+		err := appendCertificateFromFile(pool, filename)
+		if err != nil {
+			return nil, errors.Wrapf(err, "could not load the certificate of idp-certificate-authority")
+		}
+	}
+	if data := config.OIDCConfig.IDPCertificateAuthorityData(); data != "" {
+		h.Logger.Debugf(1, "Loading the certificate of idp-certificate-authority-data")
+		err := appendEncodedCertificate(pool, data)
+		if err != nil {
+			return nil, errors.Wrapf(err, "could not load the certificate of idp-certificate-authority-data")
+		}
+	}
+	if config.CertificateAuthorityFilename != "" {
+		h.Logger.Debugf(1, "Loading the certificate %s", config.CertificateAuthorityFilename)
+		err := appendCertificateFromFile(pool, config.CertificateAuthorityFilename)
+		if err != nil {
+			return nil, errors.Wrapf(err, "could not load the certificate")
+		}
+	}
+
+	var tlsConfig tls.Config
+	if len(pool.Subjects()) > 0 {
+		tlsConfig.RootCAs = pool
+	}
+	tlsConfig.InsecureSkipVerify = config.SkipTLSVerify
+	return &http.Client{
+		Transport: &infrastructure.LoggingTransport{
+			Base: &http.Transport{
+				TLSClientConfig: &tlsConfig,
+				Proxy:           http.ProxyFromEnvironment,
+			},
+			Logger: h.Logger,
+		},
+	}, nil
+}
+
+func appendCertificateFromFile(pool *x509.CertPool, filename string) error {
+	b, err := ioutil.ReadFile(filename)
+	if err != nil {
+		return errors.Wrapf(err, "could not read %s", filename)
+	}
+	if !pool.AppendCertsFromPEM(b) {
+		return errors.Errorf("could not append certificate from %s", filename)
+	}
+	return nil
+}
+
+func appendEncodedCertificate(pool *x509.CertPool, base64String string) error {
+	b, err := base64.StdEncoding.DecodeString(base64String)
+	if err != nil {
+		return errors.Wrapf(err, "could not decode base64")
+	}
+	if !pool.AppendCertsFromPEM(b) {
+		return errors.Errorf("could not append certificate")
+	}
+	return nil
+}
--- a/adaptors/interfaces/adaptors.go
+++ b/adaptors/interfaces/adaptors.go
@@ -0,0 +1,74 @@
+package adaptors
+
+import (
+	"context"
+	"net/http"
+
+	"github.com/coreos/go-oidc"
+	"github.com/int128/kubelogin/kubeconfig"
+)
+
+//go:generate mockgen -package mock_adaptors -destination ../mock_adaptors/mock_adaptors.go github.com/int128/kubelogin/adaptors/interfaces KubeConfig,HTTP,OIDC,Logger
+
+type Cmd interface {
+	Run(ctx context.Context, args []string, version string) int
+}
+
+type KubeConfig interface {
+	LoadByDefaultRules(filename string) (*kubeconfig.Config, error)
+	LoadFromFile(filename string) (*kubeconfig.Config, error)
+	WriteToFile(config *kubeconfig.Config, filename string) error
+}
+
+type HTTP interface {
+	NewClient(config HTTPClientConfig) (*http.Client, error)
+}
+
+type HTTPClientConfig struct {
+	OIDCConfig                   kubeconfig.OIDCConfig
+	CertificateAuthorityFilename string
+	SkipTLSVerify                bool
+}
+
+type OIDC interface {
+	Authenticate(ctx context.Context, in OIDCAuthenticateIn, cb OIDCAuthenticateCallback) (*OIDCAuthenticateOut, error)
+	Verify(ctx context.Context, in OIDCVerifyIn) (*oidc.IDToken, error)
+}
+
+type OIDCAuthenticateIn struct {
+	Config          kubeconfig.OIDCConfig
+	Client          *http.Client // HTTP client for oidc and oauth2
+	LocalServerPort []int        // HTTP server port candidates
+	SkipOpenBrowser bool         // skip opening browser if true
+}
+
+type OIDCAuthenticateCallback struct {
+	ShowLocalServerURL func(url string)
+}
+
+type OIDCAuthenticateOut struct {
+	VerifiedIDToken *oidc.IDToken
+	IDToken         string
+	RefreshToken    string
+}
+
+type OIDCVerifyIn struct {
+	Config kubeconfig.OIDCConfig
+	Client *http.Client
+}
+
+type Logger interface {
+	Printf(format string, v ...interface{})
+	Debugf(level LogLevel, format string, v ...interface{})
+	SetLevel(level LogLevel)
+	IsEnabled(level LogLevel) bool
+}
+
+// LogLevel represents a log level for debug.
+//
+// 0 = None
+// 1 = Including in/out
+// 2 = Including transport headers
+// 3 = Including transport body
+//
+type LogLevel int
--- a/adaptors/kubeconfig.go
+++ b/adaptors/kubeconfig.go
@@ -0,0 +1,44 @@
+package adaptors
+
+import (
+	"github.com/int128/kubelogin/adaptors/interfaces"
+	"github.com/int128/kubelogin/kubeconfig"
+	"github.com/pkg/errors"
+	"k8s.io/client-go/tools/clientcmd"
+	"k8s.io/client-go/tools/clientcmd/api"
+)
+
+func NewKubeConfig() adaptors.KubeConfig {
+	return &KubeConfig{}
+}
+
+type KubeConfig struct{}
+
+// LoadByDefaultRules loads the config by the default rules, that is same as kubectl.
+func (*KubeConfig) LoadByDefaultRules(filename string) (*kubeconfig.Config, error) {
+	rules := clientcmd.NewDefaultClientConfigLoadingRules()
+	rules.ExplicitPath = filename
+	config, err := rules.Load()
+	if err != nil {
+		return nil, errors.Wrapf(err, "could not read the kubeconfig")
+	}
+	return (*kubeconfig.Config)(config), err
+}
+
+// LoadFromFile loads the config from the single file.
+func (*KubeConfig) LoadFromFile(filename string) (*kubeconfig.Config, error) {
+	config, err := clientcmd.LoadFromFile(filename)
+	if err != nil {
+		return nil, errors.Wrapf(err, "could not read the kubeconfig from %s", filename)
+	}
+	return (*kubeconfig.Config)(config), err
+}
+
+// WriteToFile writes the config to the single file.
+func (*KubeConfig) WriteToFile(config *kubeconfig.Config, filename string) error {
+	err := clientcmd.WriteToFile(*(*api.Config)(config), filename)
+	if err != nil {
+		return errors.Wrapf(err, "could not write the kubeconfig to %s", filename)
+	}
+	return err
+}
--- a/adaptors/kubeconfig_test.go
+++ b/adaptors/kubeconfig_test.go
@@ -0,0 +1,74 @@
+package adaptors
+
+import (
+	"os"
+	"testing"
+)
+
+func TestKubeConfig_LoadByDefaultRules(t *testing.T) {
+	var adaptor KubeConfig
+
+	t.Run("google.yaml>keycloak.yaml", func(t *testing.T) {
+		setenv(t, "KUBECONFIG", "testdata/kubeconfig.google.yaml"+string(os.PathListSeparator)+"testdata/kubeconfig.keycloak.yaml")
+		defer unsetenv(t, "KUBECONFIG")
+
+		config, err := adaptor.LoadByDefaultRules("")
+		if err != nil {
+			t.Fatalf("Could not load the configs: %s", err)
+		}
+		if w := "google@hello.k8s.local"; w != config.CurrentContext {
+			t.Errorf("CurrentContext wants %s but %s", w, config.CurrentContext)
+		}
+		if _, ok := config.Contexts["google@hello.k8s.local"]; !ok {
+			t.Errorf("Contexts[google@hello.k8s.local] is missing")
+		}
+		if _, ok := config.Contexts["keycloak@hello.k8s.local"]; !ok {
+			t.Errorf("Contexts[keycloak@hello.k8s.local] is missing")
+		}
+		if _, ok := config.AuthInfos["google"]; !ok {
+			t.Errorf("AuthInfos[google] is missing")
+		}
+		if _, ok := config.AuthInfos["keycloak"]; !ok {
+			t.Errorf("AuthInfos[keycloak] is missing")
+		}
+	})
+
+	t.Run("keycloak.yaml>google.yaml", func(t *testing.T) {
+		setenv(t, "KUBECONFIG", "testdata/kubeconfig.keycloak.yaml"+string(os.PathListSeparator)+"testdata/kubeconfig.google.yaml")
+		defer unsetenv(t, "KUBECONFIG")
+
+		config, err := adaptor.LoadByDefaultRules("")
+		if err != nil {
+			t.Fatalf("Could not load the configs: %s", err)
+		}
+		if w := "keycloak@hello.k8s.local"; w != config.CurrentContext {
+			t.Errorf("CurrentContext wants %s but %s", w, config.CurrentContext)
+		}
+		if _, ok := config.Contexts["google@hello.k8s.local"]; !ok {
+			t.Errorf("Contexts[google@hello.k8s.local] is missing")
+		}
+		if _, ok := config.Contexts["keycloak@hello.k8s.local"]; !ok {
+			t.Errorf("Contexts[keycloak@hello.k8s.local] is missing")
+		}
+		if _, ok := config.AuthInfos["google"]; !ok {
+			t.Errorf("AuthInfos[google] is missing")
+		}
+		if _, ok := config.AuthInfos["keycloak"]; !ok {
+			t.Errorf("AuthInfos[keycloak] is missing")
+		}
+	})
+}
+
+func setenv(t *testing.T, key, value string) {
+	t.Helper()
+	if err := os.Setenv(key, value); err != nil {
+		t.Fatalf("Could not set the env var %s=%s: %s", key, value, err)
+	}
+}
+
+func unsetenv(t *testing.T, key string) {
+	t.Helper()
+	if err := os.Unsetenv(key); err != nil {
+		t.Fatalf("Could not unset the env var %s: %s", key, err)
+	}
+}
--- a/adaptors/logger.go
+++ b/adaptors/logger.go
@@ -0,0 +1,49 @@
+package adaptors
+
+import (
+	"log"
+	"os"
+
+	"github.com/int128/kubelogin/adaptors/interfaces"
+)
+
+// NewLogger returns a Logger with the standard log.Logger for messages and debug.
+func NewLogger() adaptors.Logger {
+	return &Logger{
+		stdLogger:   log.New(os.Stderr, "", 0),
+		debugLogger: log.New(os.Stderr, "", log.Ltime|log.Lmicroseconds),
+	}
+}
+
+// NewLoggerWith returns a Logger with the given standard log.Logger.
+func NewLoggerWith(l stdLogger) *Logger {
+	return &Logger{
+		stdLogger:   l,
+		debugLogger: l,
+	}
+}
+
+type stdLogger interface {
+	Printf(format string, v ...interface{})
+}
+
+// Logger wraps the standard log.Logger and just provides debug level.
+type Logger struct {
+	stdLogger
+	debugLogger stdLogger
+	level       adaptors.LogLevel
+}
+
+func (l *Logger) Debugf(level adaptors.LogLevel, format string, v ...interface{}) {
+	if l.IsEnabled(level) {
+		l.debugLogger.Printf(format, v...)
+	}
+}
+
+func (l *Logger) SetLevel(level adaptors.LogLevel) {
+	l.level = level
+}
+
+func (l *Logger) IsEnabled(level adaptors.LogLevel) bool {
+	return level <= l.level
+}
--- a/adaptors/logger_test.go
+++ b/adaptors/logger_test.go
@@ -0,0 +1,53 @@
+package adaptors
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/int128/kubelogin/adaptors/interfaces"
+)
+
+type mockStdLogger struct {
+	count int
+}
+
+func (l *mockStdLogger) Printf(format string, v ...interface{}) {
+	l.count++
+}
+
+func TestLogger_Debugf(t *testing.T) {
+	for _, c := range []struct {
+		loggerLevel adaptors.LogLevel
+		debugfLevel adaptors.LogLevel
+		count       int
+	}{
+		{0, 0, 1},
+		{0, 1, 0},
+
+		{1, 0, 1},
+		{1, 1, 1},
+		{1, 2, 0},
+
+		{2, 1, 1},
+		{2, 2, 1},
+		{2, 3, 0},
+	} {
+		t.Run(fmt.Sprintf("%+v", c), func(t *testing.T) {
+			m := &mockStdLogger{}
+			l := &Logger{debugLogger: m, level: c.loggerLevel}
+			l.Debugf(c.debugfLevel, "hello")
+			if m.count != c.count {
+				t.Errorf("count wants %d but %d", c.count, m.count)
+			}
+		})
+	}
+}
+
+func TestLogger_Printf(t *testing.T) {
+	m := &mockStdLogger{}
+	l := &Logger{stdLogger: m}
+	l.Printf("hello")
+	if m.count != 1 {
+		t.Errorf("count wants %d but %d", 1, m.count)
+	}
+}
--- a/adaptors/mock_adaptors/logger.go
+++ b/adaptors/mock_adaptors/logger.go
@@ -0,0 +1,31 @@
+package mock_adaptors
+
+import (
+	"github.com/golang/mock/gomock"
+	"github.com/int128/kubelogin/adaptors/interfaces"
+)
+
+func NewLogger(t testingLogger, ctrl *gomock.Controller) *Logger {
+	return &Logger{
+		MockLogger:    NewMockLogger(ctrl),
+		testingLogger: t,
+	}
+}
+
+type testingLogger interface {
+	Logf(format string, v ...interface{})
+}
+
+// Logger provides mock feature but overrides output methods with actual logging.
+type Logger struct {
+	*MockLogger
+	testingLogger testingLogger
+}
+
+func (l *Logger) Printf(format string, v ...interface{}) {
+	l.testingLogger.Logf(format, v...)
+}
+
+func (l *Logger) Debugf(level adaptors.LogLevel, format string, v ...interface{}) {
+	l.testingLogger.Logf(format, v...)
+}
--- a/adaptors/mock_adaptors/mock_adaptors.go
+++ b/adaptors/mock_adaptors/mock_adaptors.go
@@ -0,0 +1,236 @@
+// Code generated by MockGen. DO NOT EDIT.
+// Source: github.com/int128/kubelogin/adaptors/interfaces (interfaces: KubeConfig,HTTP,OIDC,Logger)
+
+// Package mock_adaptors is a generated GoMock package.
+package mock_adaptors
+
+import (
+	context "context"
+	go_oidc "github.com/coreos/go-oidc"
+	gomock "github.com/golang/mock/gomock"
+	interfaces "github.com/int128/kubelogin/adaptors/interfaces"
+	kubeconfig "github.com/int128/kubelogin/kubeconfig"
+	http "net/http"
+	reflect "reflect"
+)
+
+// MockKubeConfig is a mock of KubeConfig interface
+type MockKubeConfig struct {
+	ctrl     *gomock.Controller
+	recorder *MockKubeConfigMockRecorder
+}
+
+// MockKubeConfigMockRecorder is the mock recorder for MockKubeConfig
+type MockKubeConfigMockRecorder struct {
+	mock *MockKubeConfig
+}
+
+// NewMockKubeConfig creates a new mock instance
+func NewMockKubeConfig(ctrl *gomock.Controller) *MockKubeConfig {
+	mock := &MockKubeConfig{ctrl: ctrl}
+	mock.recorder = &MockKubeConfigMockRecorder{mock}
+	return mock
+}
+
+// EXPECT returns an object that allows the caller to indicate expected use
+func (m *MockKubeConfig) EXPECT() *MockKubeConfigMockRecorder {
+	return m.recorder
+}
+
+// LoadByDefaultRules mocks base method
+func (m *MockKubeConfig) LoadByDefaultRules(arg0 string) (*kubeconfig.Config, error) {
+	ret := m.ctrl.Call(m, "LoadByDefaultRules", arg0)
+	ret0, _ := ret[0].(*kubeconfig.Config)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// LoadByDefaultRules indicates an expected call of LoadByDefaultRules
+func (mr *MockKubeConfigMockRecorder) LoadByDefaultRules(arg0 interface{}) *gomock.Call {
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "LoadByDefaultRules", reflect.TypeOf((*MockKubeConfig)(nil).LoadByDefaultRules), arg0)
+}
+
+// LoadFromFile mocks base method
+func (m *MockKubeConfig) LoadFromFile(arg0 string) (*kubeconfig.Config, error) {
+	ret := m.ctrl.Call(m, "LoadFromFile", arg0)
+	ret0, _ := ret[0].(*kubeconfig.Config)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// LoadFromFile indicates an expected call of LoadFromFile
+func (mr *MockKubeConfigMockRecorder) LoadFromFile(arg0 interface{}) *gomock.Call {
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "LoadFromFile", reflect.TypeOf((*MockKubeConfig)(nil).LoadFromFile), arg0)
+}
+
+// WriteToFile mocks base method
+func (m *MockKubeConfig) WriteToFile(arg0 *kubeconfig.Config, arg1 string) error {
+	ret := m.ctrl.Call(m, "WriteToFile", arg0, arg1)
+	ret0, _ := ret[0].(error)
+	return ret0
+}
+
+// WriteToFile indicates an expected call of WriteToFile
+func (mr *MockKubeConfigMockRecorder) WriteToFile(arg0, arg1 interface{}) *gomock.Call {
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "WriteToFile", reflect.TypeOf((*MockKubeConfig)(nil).WriteToFile), arg0, arg1)
+}
+
+// MockHTTP is a mock of HTTP interface
+type MockHTTP struct {
+	ctrl     *gomock.Controller
+	recorder *MockHTTPMockRecorder
+}
+
+// MockHTTPMockRecorder is the mock recorder for MockHTTP
+type MockHTTPMockRecorder struct {
+	mock *MockHTTP
+}
+
+// NewMockHTTP creates a new mock instance
+func NewMockHTTP(ctrl *gomock.Controller) *MockHTTP {
+	mock := &MockHTTP{ctrl: ctrl}
+	mock.recorder = &MockHTTPMockRecorder{mock}
+	return mock
+}
+
+// EXPECT returns an object that allows the caller to indicate expected use
+func (m *MockHTTP) EXPECT() *MockHTTPMockRecorder {
+	return m.recorder
+}
+
+// NewClient mocks base method
+func (m *MockHTTP) NewClient(arg0 interfaces.HTTPClientConfig) (*http.Client, error) {
+	ret := m.ctrl.Call(m, "NewClient", arg0)
+	ret0, _ := ret[0].(*http.Client)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// NewClient indicates an expected call of NewClient
+func (mr *MockHTTPMockRecorder) NewClient(arg0 interface{}) *gomock.Call {
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "NewClient", reflect.TypeOf((*MockHTTP)(nil).NewClient), arg0)
+}
+
+// MockOIDC is a mock of OIDC interface
+type MockOIDC struct {
+	ctrl     *gomock.Controller
+	recorder *MockOIDCMockRecorder
+}
+
+// MockOIDCMockRecorder is the mock recorder for MockOIDC
+type MockOIDCMockRecorder struct {
+	mock *MockOIDC
+}
+
+// NewMockOIDC creates a new mock instance
+func NewMockOIDC(ctrl *gomock.Controller) *MockOIDC {
+	mock := &MockOIDC{ctrl: ctrl}
+	mock.recorder = &MockOIDCMockRecorder{mock}
+	return mock
+}
+
+// EXPECT returns an object that allows the caller to indicate expected use
+func (m *MockOIDC) EXPECT() *MockOIDCMockRecorder {
+	return m.recorder
+}
+
+// Authenticate mocks base method
+func (m *MockOIDC) Authenticate(arg0 context.Context, arg1 interfaces.OIDCAuthenticateIn, arg2 interfaces.OIDCAuthenticateCallback) (*interfaces.OIDCAuthenticateOut, error) {
+	ret := m.ctrl.Call(m, "Authenticate", arg0, arg1, arg2)
+	ret0, _ := ret[0].(*interfaces.OIDCAuthenticateOut)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// Authenticate indicates an expected call of Authenticate
+func (mr *MockOIDCMockRecorder) Authenticate(arg0, arg1, arg2 interface{}) *gomock.Call {
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Authenticate", reflect.TypeOf((*MockOIDC)(nil).Authenticate), arg0, arg1, arg2)
+}
+
+// Verify mocks base method
+func (m *MockOIDC) Verify(arg0 context.Context, arg1 interfaces.OIDCVerifyIn) (*go_oidc.IDToken, error) {
+	ret := m.ctrl.Call(m, "Verify", arg0, arg1)
+	ret0, _ := ret[0].(*go_oidc.IDToken)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// Verify indicates an expected call of Verify
+func (mr *MockOIDCMockRecorder) Verify(arg0, arg1 interface{}) *gomock.Call {
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Verify", reflect.TypeOf((*MockOIDC)(nil).Verify), arg0, arg1)
+}
+
+// MockLogger is a mock of Logger interface
+type MockLogger struct {
+	ctrl     *gomock.Controller
+	recorder *MockLoggerMockRecorder
+}
+
+// MockLoggerMockRecorder is the mock recorder for MockLogger
+type MockLoggerMockRecorder struct {
+	mock *MockLogger
+}
+
+// NewMockLogger creates a new mock instance
+func NewMockLogger(ctrl *gomock.Controller) *MockLogger {
+	mock := &MockLogger{ctrl: ctrl}
+	mock.recorder = &MockLoggerMockRecorder{mock}
+	return mock
+}
+
+// EXPECT returns an object that allows the caller to indicate expected use
+func (m *MockLogger) EXPECT() *MockLoggerMockRecorder {
+	return m.recorder
+}
+
+// Debugf mocks base method
+func (m *MockLogger) Debugf(arg0 interfaces.LogLevel, arg1 string, arg2 ...interface{}) {
+	varargs := []interface{}{arg0, arg1}
+	for _, a := range arg2 {
+		varargs = append(varargs, a)
+	}
+	m.ctrl.Call(m, "Debugf", varargs...)
+}
+
+// Debugf indicates an expected call of Debugf
+func (mr *MockLoggerMockRecorder) Debugf(arg0, arg1 interface{}, arg2 ...interface{}) *gomock.Call {
+	varargs := append([]interface{}{arg0, arg1}, arg2...)
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Debugf", reflect.TypeOf((*MockLogger)(nil).Debugf), varargs...)
+}
+
+// IsEnabled mocks base method
+func (m *MockLogger) IsEnabled(arg0 interfaces.LogLevel) bool {
+	ret := m.ctrl.Call(m, "IsEnabled", arg0)
+	ret0, _ := ret[0].(bool)
+	return ret0
+}
+
+// IsEnabled indicates an expected call of IsEnabled
+func (mr *MockLoggerMockRecorder) IsEnabled(arg0 interface{}) *gomock.Call {
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "IsEnabled", reflect.TypeOf((*MockLogger)(nil).IsEnabled), arg0)
+}
+
+// Printf mocks base method
+func (m *MockLogger) Printf(arg0 string, arg1 ...interface{}) {
+	varargs := []interface{}{arg0}
+	for _, a := range arg1 {
+		varargs = append(varargs, a)
+	}
+	m.ctrl.Call(m, "Printf", varargs...)
+}
+
+// Printf indicates an expected call of Printf
+func (mr *MockLoggerMockRecorder) Printf(arg0 interface{}, arg1 ...interface{}) *gomock.Call {
+	varargs := append([]interface{}{arg0}, arg1...)
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Printf", reflect.TypeOf((*MockLogger)(nil).Printf), varargs...)
+}
+
+// SetLevel mocks base method
+func (m *MockLogger) SetLevel(arg0 interfaces.LogLevel) {
+	m.ctrl.Call(m, "SetLevel", arg0)
+}
+
+// SetLevel indicates an expected call of SetLevel
+func (mr *MockLoggerMockRecorder) SetLevel(arg0 interface{}) *gomock.Call {
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "SetLevel", reflect.TypeOf((*MockLogger)(nil).SetLevel), arg0)
+}
--- a/adaptors/oidc.go
+++ b/adaptors/oidc.go
@@ -0,0 +1,73 @@
+package adaptors
+
+import (
+	"context"
+
+	"github.com/coreos/go-oidc"
+	"github.com/int128/kubelogin/adaptors/interfaces"
+	"github.com/int128/oauth2cli"
+	"github.com/pkg/errors"
+	"golang.org/x/oauth2"
+)
+
+func NewOIDC() adaptors.OIDC {
+	return &OIDC{}
+}
+
+type OIDC struct{}
+
+func (*OIDC) Authenticate(ctx context.Context, in adaptors.OIDCAuthenticateIn, cb adaptors.OIDCAuthenticateCallback) (*adaptors.OIDCAuthenticateOut, error) {
+	if in.Client != nil {
+		ctx = context.WithValue(ctx, oauth2.HTTPClient, in.Client)
+	}
+	provider, err := oidc.NewProvider(ctx, in.Config.IDPIssuerURL())
+	if err != nil {
+		return nil, errors.Wrapf(err, "could not discovery the OIDC issuer")
+	}
+	config := oauth2cli.Config{
+		OAuth2Config: oauth2.Config{
+			Endpoint:     provider.Endpoint(),
+			ClientID:     in.Config.ClientID(),
+			ClientSecret: in.Config.ClientSecret(),
+			Scopes:       append(in.Config.ExtraScopes(), oidc.ScopeOpenID),
+		},
+		LocalServerPort:    in.LocalServerPort,
+		SkipOpenBrowser:    in.SkipOpenBrowser,
+		AuthCodeOptions:    []oauth2.AuthCodeOption{oauth2.AccessTypeOffline},
+		ShowLocalServerURL: cb.ShowLocalServerURL,
+	}
+	token, err := oauth2cli.GetToken(ctx, config)
+	if err != nil {
+		return nil, errors.Wrapf(err, "could not get a token")
+	}
+	idToken, ok := token.Extra("id_token").(string)
+	if !ok {
+		return nil, errors.Errorf("id_token is missing in the token response: %s", token)
+	}
+	verifier := provider.Verifier(&oidc.Config{ClientID: in.Config.ClientID()})
+	verifiedIDToken, err := verifier.Verify(ctx, idToken)
+	if err != nil {
+		return nil, errors.Wrapf(err, "could not verify the id_token")
+	}
+	return &adaptors.OIDCAuthenticateOut{
+		VerifiedIDToken: verifiedIDToken,
+		IDToken:         idToken,
+		RefreshToken:    token.RefreshToken,
+	}, nil
+}
+
+func (*OIDC) Verify(ctx context.Context, in adaptors.OIDCVerifyIn) (*oidc.IDToken, error) {
+	if in.Client != nil {
+		ctx = context.WithValue(ctx, oauth2.HTTPClient, in.Client)
+	}
+	provider, err := oidc.NewProvider(ctx, in.Config.IDPIssuerURL())
+	if err != nil {
+		return nil, errors.Wrapf(err, "could not discovery the OIDC issuer")
+	}
+	verifier := provider.Verifier(&oidc.Config{ClientID: in.Config.ClientID()})
+	verifiedIDToken, err := verifier.Verify(ctx, in.Config.IDToken())
+	if err != nil {
+		return nil, errors.Wrapf(err, "could not verify the id_token")
+	}
+	return verifiedIDToken, nil
+}
--- a/adaptors/testdata/kubeconfig.google.yaml
+++ b/adaptors/testdata/kubeconfig.google.yaml
@@ -0,0 +1,17 @@
+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/adaptors/testdata/kubeconfig.keycloak.yaml
+++ b/adaptors/testdata/kubeconfig.keycloak.yaml
@@ -0,0 +1,16 @@
+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/adaptors_test/authserver/authserver.go
+++ b/adaptors_test/authserver/authserver.go
@@ -0,0 +1,39 @@
+package authserver
+
+import (
+	"crypto/rsa"
+	"net/http"
+	"testing"
+)
+
+// Config represents server configuration.
+type Config struct {
+	Addr           string
+	Issuer         string
+	Scope          string
+	TLSServerCert  string
+	TLSServerKey   string
+	IDToken        string
+	RefreshToken   string
+	IDTokenKeyPair *rsa.PrivateKey
+}
+
+// Start starts a HTTP server.
+func Start(t *testing.T, c Config) *http.Server {
+	s := &http.Server{
+		Addr:    c.Addr,
+		Handler: newHandler(t, c),
+	}
+	go func() {
+		var err error
+		if c.TLSServerCert != "" && c.TLSServerKey != "" {
+			err = s.ListenAndServeTLS(c.TLSServerCert, c.TLSServerKey)
+		} else {
+			err = s.ListenAndServe()
+		}
+		if err != nil && err != http.ErrServerClosed {
+			t.Error(err)
+		}
+	}()
+	return s
+}
--- a/adaptors_test/authserver/handler.go
+++ b/adaptors_test/authserver/handler.go
@@ -0,0 +1,108 @@
+package authserver
+
+import (
+	"encoding/base64"
+	"fmt"
+	"math/big"
+	"net/http"
+	"testing"
+	"text/template"
+
+	"github.com/pkg/errors"
+)
+
+type handler struct {
+	t *testing.T
+
+	discovery *template.Template
+	token     *template.Template
+	jwks      *template.Template
+	authCode  string
+
+	// Template values
+	Issuer       string
+	Scope        string // Default to openid
+	IDToken      string
+	RefreshToken string
+	PrivateKey   struct{ N, E string }
+}
+
+func newHandler(t *testing.T, c Config) *handler {
+	tpl, err := template.ParseFiles(
+		"authserver/testdata/oidc-discovery.json",
+		"authserver/testdata/oidc-token.json",
+		"authserver/testdata/oidc-jwks.json",
+	)
+	if err != nil {
+		t.Fatalf("could not read the templates: %s", err)
+	}
+	h := handler{
+		t:            t,
+		discovery:    tpl.Lookup("oidc-discovery.json"),
+		token:        tpl.Lookup("oidc-token.json"),
+		jwks:         tpl.Lookup("oidc-jwks.json"),
+		authCode:     "3d24a8bd-35e6-457d-999e-e04bb1dfcec7",
+		Issuer:       c.Issuer,
+		Scope:        c.Scope,
+		IDToken:      c.IDToken,
+		RefreshToken: c.RefreshToken,
+	}
+	if h.Scope == "" {
+		h.Scope = "openid"
+	}
+	if c.IDTokenKeyPair != nil {
+		h.PrivateKey.E = base64.RawURLEncoding.EncodeToString(big.NewInt(int64(c.IDTokenKeyPair.E)).Bytes())
+		h.PrivateKey.N = base64.RawURLEncoding.EncodeToString(c.IDTokenKeyPair.N.Bytes())
+	}
+	return &h
+}
+
+func (h *handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	if err := h.serveHTTP(w, r); err != nil {
+		h.t.Logf("[auth-server] Error: %s", err)
+		w.WriteHeader(500)
+	}
+}
+
+func (h *handler) serveHTTP(w http.ResponseWriter, r *http.Request) error {
+	m := r.Method
+	p := r.URL.Path
+	h.t.Logf("[auth-server] %s %s", m, r.RequestURI)
+	switch {
+	case m == "GET" && p == "/.well-known/openid-configuration":
+		w.Header().Add("Content-Type", "application/json")
+		if err := h.discovery.Execute(w, h); err != nil {
+			return errors.Wrapf(err, "could not execute the template")
+		}
+	case m == "GET" && p == "/protocol/openid-connect/auth":
+		// Authentication Response
+		// http://openid.net/specs/openid-connect-core-1_0.html#AuthResponse
+		q := r.URL.Query()
+		if h.Scope != q.Get("scope") {
+			return errors.Errorf("scope wants %s but %s", h.Scope, q.Get("scope"))
+		}
+		to := fmt.Sprintf("%s?state=%s&code=%s", q.Get("redirect_uri"), q.Get("state"), h.authCode)
+		http.Redirect(w, r, to, 302)
+	case m == "POST" && p == "/protocol/openid-connect/token":
+		// Token Response
+		// http://openid.net/specs/openid-connect-core-1_0.html#TokenResponse
+		if err := r.ParseForm(); err != nil {
+			return errors.Wrapf(err, "could not parse the form")
+		}
+		if h.authCode != r.Form.Get("code") {
+			return errors.Errorf("code wants %s but %s", h.authCode, r.Form.Get("code"))
+		}
+		w.Header().Add("Content-Type", "application/json")
+		if err := h.token.Execute(w, h); err != nil {
+			return errors.Wrapf(err, "could not execute the template")
+		}
+	case m == "GET" && p == "/protocol/openid-connect/certs":
+		w.Header().Add("Content-Type", "application/json")
+		if err := h.jwks.Execute(w, h); err != nil {
+			return errors.Wrapf(err, "could not execute the template")
+		}
+	default:
+		http.Error(w, "Not Found", 404)
+	}
+	return nil
+}
--- a/adaptors_test/authserver/testdata/oidc-discovery.json
+++ b/adaptors_test/authserver/testdata/oidc-discovery.json
@@ -0,0 +1,85 @@
+{
+  "issuer": "{{ .Issuer }}",
+  "authorization_endpoint": "{{ .Issuer }}/protocol/openid-connect/auth",
+  "token_endpoint": "{{ .Issuer }}/protocol/openid-connect/token",
+  "token_introspection_endpoint": "{{ .Issuer }}/protocol/openid-connect/token/introspect",
+  "userinfo_endpoint": "{{ .Issuer }}/protocol/openid-connect/userinfo",
+  "end_session_endpoint": "{{ .Issuer }}/protocol/openid-connect/logout",
+  "jwks_uri": "{{ .Issuer }}/protocol/openid-connect/certs",
+  "check_session_iframe": "{{ .Issuer }}/protocol/openid-connect/login-status-iframe.html",
+  "grant_types_supported": [
+    "authorization_code",
+    "implicit",
+    "refresh_token",
+    "password",
+    "client_credentials"
+  ],
+  "response_types_supported": [
+    "code",
+    "none",
+    "id_token",
+    "token",
+    "id_token token",
+    "code id_token",
+    "code token",
+    "code id_token token"
+  ],
+  "subject_types_supported": [
+    "public",
+    "pairwise"
+  ],
+  "id_token_signing_alg_values_supported": [
+    "RS256"
+  ],
+  "userinfo_signing_alg_values_supported": [
+    "RS256"
+  ],
+  "request_object_signing_alg_values_supported": [
+    "none",
+    "RS256"
+  ],
+  "response_modes_supported": [
+    "query",
+    "fragment",
+    "form_post"
+  ],
+  "registration_endpoint": "{{ .Issuer }}/clients-registrations/openid-connect",
+  "token_endpoint_auth_methods_supported": [
+    "private_key_jwt",
+    "client_secret_basic",
+    "client_secret_post",
+    "client_secret_jwt"
+  ],
+  "token_endpoint_auth_signing_alg_values_supported": [
+    "RS256"
+  ],
+  "claims_supported": [
+    "sub",
+    "iss",
+    "auth_time",
+    "name",
+    "given_name",
+    "family_name",
+    "preferred_username",
+    "email"
+  ],
+  "claim_types_supported": [
+    "normal"
+  ],
+  "claims_parameter_supported": false,
+  "scopes_supported": [
+    "openid",
+    "offline_access",
+    "phone",
+    "address",
+    "email",
+    "profile"
+  ],
+  "request_parameter_supported": true,
+  "request_uri_parameter_supported": true,
+  "code_challenge_methods_supported": [
+    "plain",
+    "S256"
+  ],
+  "tls_client_certificate_bound_access_tokens": true
+}
--- a/adaptors_test/authserver/testdata/oidc-jwks.json
+++ b/adaptors_test/authserver/testdata/oidc-jwks.json
@@ -0,0 +1,12 @@
+{
+  "keys": [
+    {
+      "kty": "RSA",
+      "alg": "RS256",
+      "use": "sig",
+      "kid": "xxx",
+      "n": "{{ .PrivateKey.N }}",
+      "e": "{{ .PrivateKey.E }}"
+    }
+  ]
+}
--- a/adaptors_test/authserver/testdata/oidc-token.json
+++ b/adaptors_test/authserver/testdata/oidc-token.json
@@ -0,0 +1,7 @@
+{
+  "access_token": "7eaae8ab-8f69-45d9-ab7c-73560cd9444d",
+  "token_type": "Bearer",
+  "refresh_token": "{{ .RefreshToken }}",
+  "expires_in": 3600,
+  "id_token": "{{ .IDToken }}"
+}
--- a/adaptors_test/cmd_test.go
+++ b/adaptors_test/cmd_test.go
@@ -0,0 +1,306 @@
+package adaptors_test
+
+import (
+	"context"
+	"crypto/tls"
+	"net/http"
+	"os"
+	"sync"
+	"testing"
+	"time"
+
+	"github.com/dgrijalva/jwt-go"
+	"github.com/int128/kubelogin/adaptors/interfaces"
+	"github.com/int128/kubelogin/adaptors_test/authserver"
+	"github.com/int128/kubelogin/adaptors_test/keys"
+	"github.com/int128/kubelogin/adaptors_test/kubeconfig"
+	"github.com/int128/kubelogin/adaptors_test/logger"
+	"github.com/int128/kubelogin/di"
+)
+
+// Run the integration tests.
+// This assumes that port 800x and 900x are available.
+//
+// 1. Start the auth server at port 900x.
+// 2. Run the Cmd.
+// 3. Open a request for port 800x.
+// 4. Wait for the Cmd.
+// 5. Shutdown the auth server.
+//
+func TestCmd_Run(t *testing.T) {
+	timeout := 1 * time.Second
+
+	t.Run("NoTLS", func(t *testing.T) {
+		t.Parallel()
+		ctx, cancel := context.WithTimeout(context.Background(), timeout)
+		defer cancel()
+
+		idToken := newIDToken(t, "http://localhost:9001")
+		serverConfig := authserver.Config{
+			Addr:           "localhost:9001",
+			Issuer:         "http://localhost:9001",
+			IDToken:        idToken,
+			IDTokenKeyPair: keys.JWSKeyPair,
+			RefreshToken:   "REFRESH_TOKEN",
+		}
+		server := authserver.Start(t, serverConfig)
+		defer shutdown(t, ctx, server)
+
+		kubeConfigFilename := kubeconfig.Create(t, &kubeconfig.Values{
+			Issuer: serverConfig.Issuer,
+		})
+		defer os.Remove(kubeConfigFilename)
+
+		var wg sync.WaitGroup
+		startBrowserRequest(t, ctx, &wg, "http://localhost:8001", nil)
+		runCmd(t, ctx, "--kubeconfig", kubeConfigFilename, "--skip-open-browser", "--listen-port", "8001")
+		wg.Wait()
+		kubeconfig.Verify(t, kubeConfigFilename, kubeconfig.AuthProviderConfig{
+			IDToken:      idToken,
+			RefreshToken: "REFRESH_TOKEN",
+		})
+	})
+
+	t.Run("env:KUBECONFIG", func(t *testing.T) {
+		t.Parallel()
+		ctx, cancel := context.WithTimeout(context.Background(), timeout)
+		defer cancel()
+
+		idToken := newIDToken(t, "http://localhost:9002")
+		serverConfig := authserver.Config{
+			Addr:           "localhost:9002",
+			Issuer:         "http://localhost:9002",
+			IDToken:        idToken,
+			IDTokenKeyPair: keys.JWSKeyPair,
+			RefreshToken:   "REFRESH_TOKEN",
+		}
+		server := authserver.Start(t, serverConfig)
+		defer shutdown(t, ctx, server)
+
+		kubeConfigFilename := kubeconfig.Create(t, &kubeconfig.Values{
+			Issuer: serverConfig.Issuer,
+		})
+		defer os.Remove(kubeConfigFilename)
+
+		setenv(t, "KUBECONFIG", kubeConfigFilename+string(os.PathListSeparator)+"kubeconfig/testdata/dummy.yaml")
+		defer unsetenv(t, "KUBECONFIG")
+
+		var wg sync.WaitGroup
+		startBrowserRequest(t, ctx, &wg, "http://localhost:8002", nil)
+		runCmd(t, ctx, "--skip-open-browser", "--listen-port", "8002")
+		wg.Wait()
+		kubeconfig.Verify(t, kubeConfigFilename, kubeconfig.AuthProviderConfig{
+			IDToken:      idToken,
+			RefreshToken: "REFRESH_TOKEN",
+		})
+	})
+
+	t.Run("ExtraScopes", func(t *testing.T) {
+		t.Parallel()
+		ctx, cancel := context.WithTimeout(context.Background(), timeout)
+		defer cancel()
+
+		idToken := newIDToken(t, "http://localhost:9003")
+		serverConfig := authserver.Config{
+			Addr:           "localhost:9003",
+			Issuer:         "http://localhost:9003",
+			IDToken:        idToken,
+			IDTokenKeyPair: keys.JWSKeyPair,
+			RefreshToken:   "REFRESH_TOKEN",
+			Scope:          "profile groups openid",
+		}
+		server := authserver.Start(t, serverConfig)
+		defer shutdown(t, ctx, server)
+
+		kubeConfigFilename := kubeconfig.Create(t, &kubeconfig.Values{
+			Issuer:      serverConfig.Issuer,
+			ExtraScopes: "profile,groups",
+		})
+		defer os.Remove(kubeConfigFilename)
+
+		var wg sync.WaitGroup
+		startBrowserRequest(t, ctx, &wg, "http://localhost:8003", nil)
+		runCmd(t, ctx, "--kubeconfig", kubeConfigFilename, "--skip-open-browser", "--listen-port", "8003")
+		wg.Wait()
+		kubeconfig.Verify(t, kubeConfigFilename, kubeconfig.AuthProviderConfig{
+			IDToken:      idToken,
+			RefreshToken: "REFRESH_TOKEN",
+		})
+	})
+
+	t.Run("CACert", func(t *testing.T) {
+		t.Parallel()
+		ctx, cancel := context.WithTimeout(context.Background(), timeout)
+		defer cancel()
+
+		idToken := newIDToken(t, "https://localhost:9004")
+		serverConfig := authserver.Config{
+			Addr:           "localhost:9004",
+			Issuer:         "https://localhost:9004",
+			IDToken:        idToken,
+			IDTokenKeyPair: keys.JWSKeyPair,
+			RefreshToken:   "REFRESH_TOKEN",
+			TLSServerCert:  keys.TLSServerCert,
+			TLSServerKey:   keys.TLSServerKey,
+		}
+		server := authserver.Start(t, serverConfig)
+		defer shutdown(t, ctx, server)
+
+		kubeConfigFilename := kubeconfig.Create(t, &kubeconfig.Values{
+			Issuer:                  serverConfig.Issuer,
+			IDPCertificateAuthority: keys.TLSCACert,
+		})
+		defer os.Remove(kubeConfigFilename)
+
+		var wg sync.WaitGroup
+		startBrowserRequest(t, ctx, &wg, "http://localhost:8004", keys.TLSCACertAsConfig)
+		runCmd(t, ctx, "--kubeconfig", kubeConfigFilename, "--skip-open-browser", "--listen-port", "8004")
+		wg.Wait()
+		kubeconfig.Verify(t, kubeConfigFilename, kubeconfig.AuthProviderConfig{
+			IDToken:      idToken,
+			RefreshToken: "REFRESH_TOKEN",
+		})
+	})
+
+	t.Run("CACertData", func(t *testing.T) {
+		t.Parallel()
+		ctx, cancel := context.WithTimeout(context.Background(), timeout)
+		defer cancel()
+
+		idToken := newIDToken(t, "https://localhost:9005")
+		serverConfig := authserver.Config{
+			Addr:           "localhost:9005",
+			Issuer:         "https://localhost:9005",
+			IDToken:        idToken,
+			IDTokenKeyPair: keys.JWSKeyPair,
+			RefreshToken:   "REFRESH_TOKEN",
+			TLSServerCert:  keys.TLSServerCert,
+			TLSServerKey:   keys.TLSServerKey,
+		}
+		server := authserver.Start(t, serverConfig)
+		defer shutdown(t, ctx, server)
+
+		kubeConfigFilename := kubeconfig.Create(t, &kubeconfig.Values{
+			Issuer:                      serverConfig.Issuer,
+			IDPCertificateAuthorityData: keys.TLSCACertAsBase64,
+		})
+		defer os.Remove(kubeConfigFilename)
+
+		var wg sync.WaitGroup
+		startBrowserRequest(t, ctx, &wg, "http://localhost:8005", keys.TLSCACertAsConfig)
+		runCmd(t, ctx, "--kubeconfig", kubeConfigFilename, "--skip-open-browser", "--listen-port", "8005")
+		wg.Wait()
+		kubeconfig.Verify(t, kubeConfigFilename, kubeconfig.AuthProviderConfig{
+			IDToken:      idToken,
+			RefreshToken: "REFRESH_TOKEN",
+		})
+	})
+
+	t.Run("AlreadyHaveValidToken", func(t *testing.T) {
+		t.Parallel()
+		ctx, cancel := context.WithTimeout(context.Background(), timeout)
+		defer cancel()
+
+		serverConfig := authserver.Config{
+			Addr:           "localhost:9006",
+			Issuer:         "http://localhost:9006",
+			IDTokenKeyPair: keys.JWSKeyPair,
+		}
+		server := authserver.Start(t, serverConfig)
+		defer shutdown(t, ctx, server)
+
+		idToken := newIDToken(t, serverConfig.Issuer)
+		kubeConfigFilename := kubeconfig.Create(t, &kubeconfig.Values{
+			Issuer:  serverConfig.Issuer,
+			IDToken: idToken,
+		})
+		defer os.Remove(kubeConfigFilename)
+
+		runCmd(t, ctx, "--kubeconfig", kubeConfigFilename, "--skip-open-browser")
+		kubeconfig.Verify(t, kubeConfigFilename, kubeconfig.AuthProviderConfig{
+			IDToken: idToken,
+		})
+	})
+}
+
+func newIDToken(t *testing.T, issuer string) string {
+	t.Helper()
+	var claims struct {
+		jwt.StandardClaims
+		Groups []string `json:"groups"`
+	}
+	claims.StandardClaims = jwt.StandardClaims{
+		Issuer:    issuer,
+		Audience:  "kubernetes",
+		ExpiresAt: time.Now().Add(time.Hour).Unix(),
+		Subject:   "SUBJECT",
+		IssuedAt:  time.Now().Unix(),
+	}
+	claims.Groups = []string{"admin", "users"}
+	token := jwt.NewWithClaims(jwt.SigningMethodRS256, claims)
+	s, err := token.SignedString(keys.JWSKeyPair)
+	if err != nil {
+		t.Fatalf("Could not sign the claims: %s", err)
+	}
+	return s
+}
+
+func runCmd(t *testing.T, ctx context.Context, args ...string) {
+	t.Helper()
+	newLogger := func() adaptors.Logger {
+		return logger.New(t)
+	}
+	if err := di.InvokeWithExtra(func(cmd adaptors.Cmd) {
+		exitCode := cmd.Run(ctx, append([]string{"kubelogin", "--v=1"}, args...), "HEAD")
+		if exitCode != 0 {
+			t.Errorf("exit status wants 0 but %d", exitCode)
+		}
+	}, newLogger); err != nil {
+		t.Errorf("Invoke returned error: %+v", err)
+	}
+}
+
+func startBrowserRequest(t *testing.T, ctx context.Context, wg *sync.WaitGroup, url string, tlsConfig *tls.Config) {
+	t.Helper()
+	client := http.Client{Transport: &http.Transport{TLSClientConfig: tlsConfig}}
+	req, err := http.NewRequest("GET", url, nil)
+	if err != nil {
+		t.Errorf("could not create a request: %s", err)
+		return
+	}
+	req = req.WithContext(ctx)
+	go func() {
+		defer wg.Done()
+		time.Sleep(50 * time.Millisecond)
+		resp, err := client.Do(req)
+		if err != nil {
+			t.Errorf("could not send a request: %s", err)
+			return
+		}
+		defer resp.Body.Close()
+		if resp.StatusCode != 200 {
+			t.Errorf("StatusCode wants 200 but %d", resp.StatusCode)
+		}
+	}()
+	wg.Add(1)
+}
+
+func shutdown(t *testing.T, ctx context.Context, s *http.Server) {
+	if err := s.Shutdown(ctx); err != nil {
+		t.Errorf("Could not shutdown the auth server: %s", err)
+	}
+}
+
+func setenv(t *testing.T, key, value string) {
+	t.Helper()
+	if err := os.Setenv(key, value); err != nil {
+		t.Fatalf("Could not set the env var %s=%s: %s", key, value, err)
+	}
+}
+
+func unsetenv(t *testing.T, key string) {
+	t.Helper()
+	if err := os.Unsetenv(key); err != nil {
+		t.Fatalf("Could not unset the env var %s: %s", key, err)
+	}
+}
--- a/adaptors_test/keys/keys.go
+++ b/adaptors_test/keys/keys.go
@@ -0,0 +1,71 @@
+package keys
+
+import (
+	"crypto/rsa"
+	"crypto/tls"
+	"crypto/x509"
+	"encoding/base64"
+	"encoding/pem"
+	"io/ioutil"
+
+	"github.com/pkg/errors"
+)
+
+// TLSCACert is path to the CA certificate.
+// This should be generated by Makefile before test.
+const TLSCACert = "keys/testdata/ca.crt"
+
+// TLSCACertAsBase64 is a base64 encoded string of TLSCACert.
+var TLSCACertAsBase64 string
+
+// TLSCACertAsConfig is a TLS config including TLSCACert.
+var TLSCACertAsConfig = &tls.Config{RootCAs: x509.NewCertPool()}
+
+// TLSServerCert is path to the server certificate.
+// This should be generated by Makefile before test.
+const TLSServerCert = "keys/testdata/server.crt"
+
+// TLSServerKey is path to the server key.
+// This should be generated by Makefile before test.
+const TLSServerKey = "keys/testdata/server.key"
+
+// JWSKey is path to the key for signing ID tokens.
+const JWSKey = "keys/testdata/jws.key"
+
+// JWSKeyPair is the key pair loaded from JWSKey.
+var JWSKeyPair *rsa.PrivateKey
+
+func init() {
+	var err error
+	JWSKeyPair, err = readPrivateKey(JWSKey)
+	if err != nil {
+		panic(err)
+	}
+	b, err := ioutil.ReadFile(TLSCACert)
+	if err != nil {
+		panic(err)
+	}
+	TLSCACertAsBase64 = base64.StdEncoding.EncodeToString(b)
+	if !TLSCACertAsConfig.RootCAs.AppendCertsFromPEM(b) {
+		panic("could not append the CA cert")
+	}
+}
+
+func readPrivateKey(name string) (*rsa.PrivateKey, error) {
+	b, err := ioutil.ReadFile(name)
+	if err != nil {
+		return nil, errors.Wrapf(err, "could not read JWSKey")
+	}
+	block, rest := pem.Decode(b)
+	if block == nil {
+		return nil, errors.New("could not decode PEM")
+	}
+	if len(rest) > 0 {
+		return nil, errors.New("PEM should contain single key but multiple keys")
+	}
+	k, err := x509.ParsePKCS1PrivateKey(block.Bytes)
+	if err != nil {
+		return nil, errors.Wrapf(err, "could not parse the key")
+	}
+	return k, nil
+}
--- a/adaptors_test/keys/testdata/.gitignore
+++ b/adaptors_test/keys/testdata/.gitignore
@@ -0,0 +1,4 @@
+/CA
+*.key
+*.csr
+*.crt
--- a/adaptors_test/keys/testdata/Makefile
+++ b/adaptors_test/keys/testdata/Makefile
@@ -0,0 +1,53 @@
+.PHONY: clean
+
+all: server.crt ca.crt jws.key
+
+clean:
+	rm -v ca.* server.*
+
+ca.key:
+	openssl genrsa -out $@ 1024
+
+ca.csr: openssl.cnf ca.key
+	openssl req -config openssl.cnf \
+		-new \
+		-key ca.key \
+		-subj "/CN=Hello CA" \
+		-out $@
+	openssl req -noout -text -in $@
+
+ca.crt: ca.csr ca.key
+	openssl x509 -req \
+		-signkey ca.key \
+		-in ca.csr \
+		-out $@
+	openssl x509 -text -in $@
+
+server.key:
+	openssl genrsa -out $@ 1024
+
+server.csr: openssl.cnf server.key
+	openssl req -config openssl.cnf \
+		-new \
+		-key server.key \
+		-subj "/CN=localhost" \
+		-out $@
+	openssl req -noout -text -in $@
+
+server.crt: openssl.cnf server.csr ca.key ca.crt
+	rm -fr ./CA
+	mkdir -p ./CA
+	touch CA/index.txt
+	touch CA/index.txt.attr
+	echo 00 > CA/serial
+	openssl ca -config openssl.cnf \
+		-extensions v3_req \
+		-batch \
+		-cert ca.crt \
+		-keyfile ca.key \
+		-in server.csr \
+		-out $@
+	openssl x509 -text -in $@
+
+jws.key:
+	openssl genrsa -out $@ 1024
--- a/adaptors_test/keys/testdata/openssl.cnf
+++ b/adaptors_test/keys/testdata/openssl.cnf
@@ -0,0 +1,37 @@
+[ ca ]
+default_ca      = CA_default
+
+[ CA_default ]
+dir             = ./CA
+certs           = $dir
+crl_dir         = $dir
+database        = $dir/index.txt
+new_certs_dir   = $dir
+default_md      = sha256
+policy          = policy_match
+serial          = $dir/serial
+default_days    = 365
+
+[ policy_match ]
+countryName             = optional
+stateOrProvinceName     = optional
+organizationName        = optional
+organizationalUnitName  = optional
+commonName              = supplied
+emailAddress            = optional
+
+[ req ]
+distinguished_name	= req_distinguished_name
+req_extensions = v3_req
+x509_extensions = v3_ca
+
+[ req_distinguished_name ]
+commonName			= Common Name (e.g. server FQDN or YOUR name)
+
+[ v3_req ]
+basicConstraints = CA:FALSE
+keyUsage = nonRepudiation, digitalSignature, keyEncipherment
+subjectAltName = DNS:localhost
+
+[ v3_ca ]
+basicConstraints = CA:true
--- a/adaptors_test/kubeconfig/kubeconfig.go
+++ b/adaptors_test/kubeconfig/kubeconfig.go
@@ -0,0 +1,79 @@
+package kubeconfig
+
+import (
+	"html/template"
+	"io/ioutil"
+	"os"
+	"testing"
+
+	"gopkg.in/yaml.v2"
+)
+
+// Values represents values in .kubeconfig template.
+type Values struct {
+	Issuer                      string
+	ExtraScopes                 string
+	IDPCertificateAuthority     string
+	IDPCertificateAuthorityData string
+	IDToken                     string
+}
+
+// Create creates a kubeconfig file and returns path to it.
+func Create(t *testing.T, v *Values) string {
+	t.Helper()
+	f, err := ioutil.TempFile("", "kubeconfig")
+	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/adaptors_test/kubeconfig/testdata/dummy.yaml
+++ b/adaptors_test/kubeconfig/testdata/dummy.yaml
@@ -0,0 +1,4 @@
+apiVersion: v1
+current-context: dummy
+kind: Config
+preferences: {}
--- a/adaptors_test/kubeconfig/testdata/kubeconfig.yaml
+++ b/adaptors_test/kubeconfig/testdata/kubeconfig.yaml
@@ -0,0 +1,34 @@
+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 }}
+      name: oidc
--- a/adaptors_test/logger/logger.go
+++ b/adaptors_test/logger/logger.go
@@ -0,0 +1,21 @@
+package logger
+
+import (
+	"github.com/int128/kubelogin/adaptors"
+)
+
+func New(t testingLogger) *adaptors.Logger {
+	return adaptors.NewLoggerWith(&bridge{t})
+}
+
+type testingLogger interface {
+	Logf(format string, v ...interface{})
+}
+
+type bridge struct {
+	t testingLogger
+}
+
+func (b *bridge) Printf(format string, v ...interface{}) {
+	b.t.Logf(format, v...)
+}
--- a/authn/authn.go
+++ b/authn/authn.go
@@ -1,61 +0,0 @@
-package authn
-
-import (
-	"context"
-	"fmt"
-
-	oidc "github.com/coreos/go-oidc"
-	"github.com/int128/kubelogin/authz"
-	"golang.org/x/oauth2"
-)
-
-// TokenSet is a set of tokens and claims.
-type TokenSet struct {
-	IDToken      string
-	RefreshToken string
-	Claims       *Claims
-}
-
-// Claims represents properties in the ID token.
-type Claims struct {
-	Email string `json:"email"`
-}
-
-// GetTokenSet retrieves a token from the OIDC provider.
-func GetTokenSet(ctx context.Context, issuer string, clientID string, clientSecret string) (*TokenSet, error) {
-	provider, err := oidc.NewProvider(ctx, issuer)
-	if err != nil {
-		return nil, fmt.Errorf("Could not access OIDC issuer: %s", err)
-	}
-	flow := authz.BrowserAuthCodeFlow{
-		Port: 8000,
-		Config: oauth2.Config{
-			Endpoint:     provider.Endpoint(),
-			ClientID:     clientID,
-			ClientSecret: clientSecret,
-			Scopes:       []string{oidc.ScopeOpenID, "email"},
-		},
-	}
-	token, err := flow.GetToken(ctx)
-	if err != nil {
-		return nil, fmt.Errorf("Could not get a token: %s", err)
-	}
-	rawIDToken, ok := token.Extra("id_token").(string)
-	if !ok {
-		return nil, fmt.Errorf("id_token is missing in the token response: %s", token)
-	}
-	verifier := provider.Verifier(&oidc.Config{ClientID: clientID})
-	idToken, err := verifier.Verify(ctx, rawIDToken)
-	if err != nil {
-		return nil, fmt.Errorf("Could not verify the id_token: %s", err)
-	}
-	var claims Claims
-	if err := idToken.Claims(&claims); err != nil {
-		return nil, fmt.Errorf("Could not extract claims from the token response: %s", err)
-	}
-	return &TokenSet{
-		IDToken:      rawIDToken,
-		RefreshToken: token.RefreshToken,
-		Claims:       &claims,
-	}, nil
-}
--- a/authz/authz.go
+++ b/authz/authz.go
@@ -1,12 +0,0 @@
-package authz
-
-import (
-	"context"
-
-	"golang.org/x/oauth2"
-)
-
-// Flow represents an authorization method.
-type Flow interface {
-	GetToken(context.Context) (*oauth2.Token, error)
-}
--- a/authz/browser.go
+++ b/authz/browser.go
@@ -1,97 +0,0 @@
-package authz
-
-import (
-	"context"
-	"fmt"
-	"log"
-	"net/http"
-
-	"golang.org/x/oauth2"
-)
-
-// BrowserAuthCodeFlow is a flow to get a token by browser interaction.
-type BrowserAuthCodeFlow struct {
-	oauth2.Config
-	Port int // HTTP server port
-}
-
-// GetToken returns a token.
-func (f *BrowserAuthCodeFlow) GetToken(ctx context.Context) (*oauth2.Token, error) {
-	f.Config.RedirectURL = fmt.Sprintf("http://localhost:%d/", f.Port)
-	state, err := generateOAuthState()
-	if err != nil {
-		return nil, err
-	}
-	log.Printf("Open http://localhost:%d for authorization", f.Port)
-	code, err := f.getCode(ctx, &f.Config, state)
-	if err != nil {
-		return nil, err
-	}
-	token, err := f.Config.Exchange(ctx, code)
-	if err != nil {
-		return nil, fmt.Errorf("Could not exchange oauth code: %s", err)
-	}
-	return token, nil
-}
-
-func (f *BrowserAuthCodeFlow) getCode(ctx context.Context, config *oauth2.Config, state string) (string, error) {
-	codeCh := make(chan string)
-	errCh := make(chan error)
-	server := http.Server{
-		Addr: fmt.Sprintf(":%d", f.Port),
-		Handler: &handler{
-			AuthCodeURL: config.AuthCodeURL(state),
-			Callback: func(code string, actualState string, err error) {
-				switch {
-				case err != nil:
-					errCh <- err
-				case actualState != state:
-					errCh <- fmt.Errorf("OAuth state did not match, should be %s but %s", state, actualState)
-				default:
-					codeCh <- code
-				}
-			},
-		},
-	}
-	go func() {
-		if err := server.ListenAndServe(); err != nil && err != http.ErrServerClosed {
-			errCh <- err
-		}
-	}()
-	select {
-	case err := <-errCh:
-		server.Shutdown(ctx)
-		return "", err
-	case code := <-codeCh:
-		server.Shutdown(ctx)
-		return code, nil
-	}
-}
-
-type handler struct {
-	AuthCodeURL string
-	Callback    func(code string, state string, err error)
-}
-
-func (s *handler) 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 != "":
-			s.Callback(code, state, nil)
-			fmt.Fprintf(w, "Back to command line.")
-		case errorCode != "":
-			s.Callback("", "", fmt.Errorf("OAuth Error: %s %s", errorCode, errorDescription))
-			fmt.Fprintf(w, "Back to command line.")
-		default:
-			http.Redirect(w, r, s.AuthCodeURL, 302)
-		}
-	default:
-		http.Error(w, "Not Found", 404)
-	}
-}
--- a/authz/cli.go
+++ b/authz/cli.go
@@ -1,35 +0,0 @@
-package authz
-
-import (
-	"context"
-	"fmt"
-	"log"
-
-	"golang.org/x/oauth2"
-)
-
-// CLIAuthCodeFlow is a flow to get a token by keyboard interaction.
-type CLIAuthCodeFlow struct {
-	oauth2.Config
-}
-
-// GetToken returns a token by browser interaction.
-func (f *CLIAuthCodeFlow) GetToken(ctx context.Context) (*oauth2.Token, error) {
-	f.Config.RedirectURL = "urn:ietf:wg:oauth:2.0:oob"
-	state, err := generateOAuthState()
-	if err != nil {
-		return nil, err
-	}
-	authCodeURL := f.Config.AuthCodeURL(state)
-	log.Printf("Open %s for authorization", authCodeURL)
-	fmt.Print("Enter code: ")
-	var code string
-	if _, err := fmt.Scanln(&code); err != nil {
-		return nil, err
-	}
-	token, err := f.Config.Exchange(ctx, code)
-	if err != nil {
-		return nil, fmt.Errorf("Could not exchange oauth code: %s", err)
-	}
-	return token, nil
-}
--- a/authz/state.go
+++ b/authz/state.go
@@ -1,15 +0,0 @@
-package authz
-
-import (
-	"crypto/rand"
-	"encoding/binary"
-	"fmt"
-)
-
-func generateOAuthState() (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/di/di.go
+++ b/di/di.go
@@ -0,0 +1,42 @@
+// Package di provides dependency injection.
+package di
+
+import (
+	"github.com/int128/kubelogin/adaptors"
+	adaptorsInterfaces "github.com/int128/kubelogin/adaptors/interfaces"
+	"github.com/int128/kubelogin/usecases"
+	"github.com/pkg/errors"
+	"go.uber.org/dig"
+)
+
+var constructors = []interface{}{
+	usecases.NewLogin,
+
+	adaptors.NewCmd,
+	adaptors.NewKubeConfig,
+	adaptors.NewOIDC,
+	adaptors.NewHTTP,
+}
+
+var extraConstructors = []interface{}{
+	adaptors.NewLogger,
+}
+
+// Invoke runs the function with the default constructors.
+func Invoke(f func(cmd adaptorsInterfaces.Cmd)) error {
+	return InvokeWithExtra(f, extraConstructors...)
+}
+
+// InvokeWithExtra runs the function with the given constructors.
+func InvokeWithExtra(f func(cmd adaptorsInterfaces.Cmd), extra ...interface{}) error {
+	c := dig.New()
+	for _, constructor := range append(constructors, extra...) {
+		if err := c.Provide(constructor); err != nil {
+			return errors.Wrapf(err, "could not provide the constructor")
+		}
+	}
+	if err := c.Invoke(f); err != nil {
+		return errors.Wrapf(err, "could not invoke")
+	}
+	return nil
+}
--- a/di/di_test.go
+++ b/di/di_test.go
@@ -0,0 +1,18 @@
+package di_test
+
+import (
+	"testing"
+
+	adaptors "github.com/int128/kubelogin/adaptors/interfaces"
+	"github.com/int128/kubelogin/di"
+)
+
+func TestInvoke(t *testing.T) {
+	if err := di.Invoke(func(cmd adaptors.Cmd) {
+		if cmd == nil {
+			t.Errorf("cmd wants non-nil but nil")
+		}
+	}); err != nil {
+		t.Fatalf("Invoke returned error: %+v", err)
+	}
+}
--- a/docs/google.md
+++ b/docs/google.md
@@ -0,0 +1,100 @@
+# Getting Started with Google Identity Platform
+
+## Prerequisite
+
+- You have a Google account.
+- You have the Cluster Admin role of the Kubernetes cluster.
+- You can configure the Kubernetes API server.
+- `kubectl` and `kubelogin` are installed to your computer.
+
+## 1. Setup Google API
+
+Open [Google APIs Console](https://console.developers.google.com/apis/credentials) and create an OAuth client with the following setting:
+
+- Application Type: Other
+
+## 2. Setup Kubernetes API server
+
+Configure your Kubernetes API Server accepts [OpenID Connect Tokens](https://kubernetes.io/docs/reference/access-authn-authz/authentication/#openid-connect-tokens).
+
+### kops
+
+If you are using [kops](https://github.com/kubernetes/kops), run `kops edit cluster` and append the following settings:
+
+```yaml
+spec:
+  kubeAPIServer:
+    oidcIssuerURL: https://accounts.google.com
+    oidcClientID: YOUR_CLIENT_ID.apps.googleusercontent.com
+```
+
+## 3. Setup Kubernetes cluster
+
+Here assign the `cluster-admin` role to you.
+
+```yaml
+kind: ClusterRoleBinding
+apiVersion: rbac.authorization.k8s.io/v1
+metadata:
+  name: oidc-admin-group
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: ClusterRole
+  name: cluster-admin
+subjects:
+- kind: User
+  name: https://accounts.google.com#1234567890
+```
+
+You can create a custom role and assign it as well.
+
+## 4. Setup kubectl
+
+Configure `kubectl` for the OIDC authentication.
+
+```sh
+kubectl config set-credentials NAME \
+  --auth-provider oidc \
+  --auth-provider-arg idp-issuer-url=https://accounts.google.com \
+  --auth-provider-arg client-id=YOUR_CLIENT_ID.apps.googleusercontent.com \
+  --auth-provider-arg client-secret=YOUR_CLIENT_SECRET
+```
+
+## 5. Run kubelogin
+
+Run `kubelogin`.
+
+```
+% kubelogin
+2018/08/10 10:36:38 Reading .kubeconfig
+2018/08/10 10:36:38 Using current context: hello.k8s.local
+2018/08/10 10:36:41 Open http://localhost:8000 for authorization
+2018/08/10 10:36:45 GET /
+2018/08/10 10:37:07 GET /?state=...&session_state=...&code=ey...
+2018/08/10 10:37:08 Updated .kubeconfig
+```
+
+Now your `~/.kube/config` should be like:
+
+```yaml
+users:
+- name: hello.k8s.local
+  user:
+    auth-provider:
+      config:
+        idp-issuer-url: https://accounts.google.com
+        client-id: YOUR_CLIENT_ID.apps.googleusercontent.com
+        client-secret: YOUR_SECRET
+        id-token: ey...       # kubelogin will update ID token here
+        refresh-token: ey...  # kubelogin will update refresh token here
+      name: oidc
+```
+
+Make sure you can access to the Kubernetes cluster.
+
+```
+% kubectl get nodes
+NAME                                    STATUS    ROLES     AGE       VERSION
+ip-1-2-3-4.us-west-2.compute.internal   Ready     node      21d       v1.9.6
+ip-1-2-3-5.us-west-2.compute.internal   Ready     node      20d       v1.9.6
+```
--- a/docs/keycloak.md
+++ b/docs/keycloak.md
@@ -0,0 +1,114 @@
+# Getting Started with Keycloak
+
+## Prerequisite
+
+- You have an administrator role of the Keycloak realm.
+- You have an administrator role of the Kubernetes cluster.
+- You can configure the Kubernetes API server.
+- `kubectl` and `kubelogin` are installed.
+
+## 1. Setup Keycloak
+
+Open the Keycloak and create an OIDC client as follows:
+
+- Client ID: `kubernetes`
+- Valid Redirect URLs:
+    - `http://localhost:8000`
+    - `http://localhost:18000` (used if the port 8000 is already in use)
+- Issuer URL: `https://keycloak.example.com/auth/realms/YOUR_REALM`
+
+You can associate client roles by adding the following mapper:
+
+- Name: `groups`
+- Mapper Type: `User Client Role`
+- Client ID: `kubernetes`
+- Client Role prefix: `kubernetes:`
+- Token Claim Name: `groups`
+- Add to ID token: on
+
+For example, if you have the `admin` role of the client, you will get a JWT with the claim `{"groups": ["kubernetes:admin"]}`.
+
+## 2. Setup Kubernetes API server
+
+Configure your Kubernetes API server accepts [OpenID Connect Tokens](https://kubernetes.io/docs/reference/access-authn-authz/authentication/#openid-connect-tokens).
+
+If you are using [kops](https://github.com/kubernetes/kops), run `kops edit cluster` and add the following spec:
+
+```yaml
+spec:
+  kubeAPIServer:
+    oidcIssuerURL: https://keycloak.example.com/auth/realms/YOUR_REALM
+    oidcClientID: kubernetes
+    oidcGroupsClaim: groups
+```
+
+## 3. Setup Kubernetes cluster
+
+Here assign the `cluster-admin` role to the `kubernetes:admin` group.
+
+```yaml
+kind: ClusterRoleBinding
+apiVersion: rbac.authorization.k8s.io/v1
+metadata:
+  name: keycloak-admin-group
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: ClusterRole
+  name: cluster-admin
+subjects:
+- kind: Group
+  name: kubernetes:admin
+```
+
+You can create a custom role and assign it as well.
+
+## 4. Setup kubectl
+
+Configure `kubectl` for the OIDC authentication.
+
+```sh
+kubectl config set-credentials NAME \
+  --auth-provider oidc \
+  --auth-provider-arg idp-issuer-url=https://keycloak.example.com/auth/realms/YOUR_REALM \
+  --auth-provider-arg client-id=kubernetes \
+  --auth-provider-arg client-secret=YOUR_CLIENT_SECRET
+```
+
+## 5. Run kubelogin
+
+Run `kubelogin`.
+
+```
+% kubelogin
+2018/08/10 10:36:38 Reading .kubeconfig
+2018/08/10 10:36:38 Using current context: hello.k8s.local
+2018/08/10 10:36:41 Open http://localhost:8000 for authorization
+2018/08/10 10:36:45 GET /
+2018/08/10 10:37:07 GET /?state=...&session_state=...&code=ey...
+2018/08/10 10:37:08 Updated .kubeconfig
+```
+
+Now your `~/.kube/config` should be like:
+
+```yaml
+users:
+- name: hello.k8s.local
+  user:
+    auth-provider:
+      config:
+        idp-issuer-url: https://keycloak.example.com/auth/realms/YOUR_REALM
+        client-id: kubernetes
+        client-secret: YOUR_SECRET
+        id-token: ey...       # kubelogin will update ID token here
+        refresh-token: ey...  # kubelogin will update refresh token here
+      name: oidc
+```
+
+Make sure you can access to the Kubernetes cluster.
+
+```
+% kubectl get nodes
+NAME                                    STATUS    ROLES     AGE       VERSION
+ip-1-2-3-4.us-west-2.compute.internal   Ready     node      21d       v1.9.6
+ip-1-2-3-5.us-west-2.compute.internal   Ready     node      20d       v1.9.6
+```
--- a/docs/team_ops.md
+++ b/docs/team_ops.md
@@ -0,0 +1,40 @@
+# Team Operation
+
+## kops
+
+Export the kubeconfig.
+
+```sh
+KUBECONFIG=.kubeconfig kops export kubecfg hello.k8s.local
+```
+
+Remove the `admin` access from the kubeconfig.
+It should look as like:
+
+```yaml
+apiVersion: v1
+kind: Config
+clusters:
+  - cluster:
+      certificate-authority-data: LS...
+      server: https://api.hello.k8s.example.com
+      name: hello.k8s.local
+contexts:
+- context:
+    cluster: hello.k8s.local
+    user: hello.k8s.local
+  name: hello.k8s.local
+current-context: hello.k8s.local
+preferences: {}
+users:
+- name: hello.k8s.local
+  user:
+    auth-provider:
+      name: oidc
+      config:
+        client-id: YOUR_CLIEND_ID
+        client-secret: YOUR_CLIENT_SECRET
+        idp-issuer-url: YOUR_ISSUER
+```
+
+You can share the kubeconfig to your team members for easy onboarding.
--- a/go.mod
+++ b/go.mod
@@ -0,0 +1,30 @@
+module github.com/int128/kubelogin
+
+require (
+	github.com/coreos/go-oidc v2.0.0+incompatible
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/dgrijalva/jwt-go v3.2.0+incompatible
+	github.com/gogo/protobuf v1.2.1 // indirect
+	github.com/golang/mock v1.3.1
+	github.com/google/gofuzz v0.0.0-20170612174753-24818f796faf // indirect
+	github.com/imdario/mergo v0.3.7 // indirect
+	github.com/int128/oauth2cli v1.4.0
+	github.com/json-iterator/go v1.1.6 // indirect
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/reflect2 v1.0.1 // indirect
+	github.com/pkg/errors v0.8.1
+	github.com/pquerna/cachecontrol v0.0.0-20180517163645-1555304b9b35 // indirect
+	github.com/spf13/pflag v1.0.3
+	github.com/stretchr/testify v1.3.0 // indirect
+	go.uber.org/dig v1.7.0
+	golang.org/x/oauth2 v0.0.0-20190319182350-c85d3e98c914
+	golang.org/x/time v0.0.0-20190308202827-9d24e82272b4 // indirect
+	gopkg.in/inf.v0 v0.9.1 // indirect
+	gopkg.in/square/go-jose.v2 v2.3.0 // indirect
+	gopkg.in/yaml.v2 v2.2.2
+	k8s.io/api v0.0.0-20190222213804-5cb15d344471 // indirect
+	k8s.io/apimachinery v0.0.0-20190221213512-86fb29eff628 // indirect
+	k8s.io/client-go v10.0.0+incompatible
+	k8s.io/klog v0.2.0 // indirect
+	sigs.k8s.io/yaml v1.1.0 // indirect
+)
--- a/go.sum
+++ b/go.sum
@@ -0,0 +1,82 @@
+cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+github.com/coreos/go-oidc v2.0.0+incompatible h1:+RStIopZ8wooMx+Vs5Bt8zMXxV1ABl5LbakNExNmZIg=
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--- a/infrastructure/http.go
+++ b/infrastructure/http.go
@@ -0,0 +1,50 @@
+package infrastructure
+
+import (
+	"net/http"
+	"net/http/httputil"
+
+	"github.com/int128/kubelogin/adaptors/interfaces"
+)
+
+const (
+	logLevelDumpHeaders = 2
+	logLevelDumpBody    = 3
+)
+
+type LoggingTransport struct {
+	Base   http.RoundTripper
+	Logger adaptors.Logger
+}
+
+func (t *LoggingTransport) RoundTrip(req *http.Request) (*http.Response, error) {
+	if !t.IsDumpEnabled() {
+		return t.Base.RoundTrip(req)
+	}
+
+	reqDump, err := httputil.DumpRequestOut(req, t.IsDumpBodyEnabled())
+	if err != nil {
+		t.Logger.Debugf(logLevelDumpHeaders, "Error: could not dump the request: %s", err)
+		return t.Base.RoundTrip(req)
+	}
+	t.Logger.Debugf(logLevelDumpHeaders, "%s", string(reqDump))
+	resp, err := t.Base.RoundTrip(req)
+	if err != nil {
+		return resp, err
+	}
+	respDump, err := httputil.DumpResponse(resp, t.IsDumpBodyEnabled())
+	if err != nil {
+		t.Logger.Debugf(logLevelDumpHeaders, "Error: could not dump the response: %s", err)
+		return resp, err
+	}
+	t.Logger.Debugf(logLevelDumpHeaders, "%s", string(respDump))
+	return resp, err
+}
+
+func (t *LoggingTransport) IsDumpEnabled() bool {
+	return t.Logger.IsEnabled(logLevelDumpHeaders)
+}
+
+func (t *LoggingTransport) IsDumpBodyEnabled() bool {
+	return t.Logger.IsEnabled(logLevelDumpBody)
+}
--- a/infrastructure/http_test.go
+++ b/infrastructure/http_test.go
@@ -0,0 +1,90 @@
+package infrastructure
+
+import (
+	"bufio"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+
+	"github.com/golang/mock/gomock"
+	"github.com/int128/kubelogin/adaptors/interfaces"
+	"github.com/int128/kubelogin/adaptors/mock_adaptors"
+)
+
+type mockTransport struct {
+	req  *http.Request
+	resp *http.Response
+}
+
+func (t *mockTransport) RoundTrip(req *http.Request) (*http.Response, error) {
+	t.req = req
+	return t.resp, nil
+}
+
+func TestLoggingTransport_RoundTrip(t *testing.T) {
+	ctrl := gomock.NewController(t)
+	defer ctrl.Finish()
+
+	logger := mock_adaptors.NewLogger(t, ctrl)
+	logger.EXPECT().
+		IsEnabled(gomock.Any()).
+		Return(true).
+		AnyTimes()
+
+	req := httptest.NewRequest("GET", "http://example.com/hello", nil)
+	resp, err := http.ReadResponse(bufio.NewReader(strings.NewReader(`HTTP/1.1 200 OK
+Host: example.com
+
+dummy`)), req)
+	if err != nil {
+		t.Errorf("could not create a response: %s", err)
+	}
+	defer resp.Body.Close()
+
+	transport := &LoggingTransport{
+		Base:   &mockTransport{resp: resp},
+		Logger: logger,
+	}
+	gotResp, err := transport.RoundTrip(req)
+	if err != nil {
+		t.Errorf("RoundTrip error: %s", err)
+	}
+	if gotResp != resp {
+		t.Errorf("resp wants %v but %v", resp, gotResp)
+	}
+}
+
+func TestLoggingTransport_IsDumpEnabled(t *testing.T) {
+	ctrl := gomock.NewController(t)
+	defer ctrl.Finish()
+
+	logger := mock_adaptors.NewLogger(t, ctrl)
+	logger.EXPECT().
+		IsEnabled(adaptors.LogLevel(logLevelDumpHeaders)).
+		Return(true)
+
+	transport := &LoggingTransport{
+		Logger: logger,
+	}
+	if transport.IsDumpEnabled() != true {
+		t.Errorf("IsDumpEnabled wants true")
+	}
+}
+
+func TestLoggingTransport_IsDumpBodyEnabled(t *testing.T) {
+	ctrl := gomock.NewController(t)
+	defer ctrl.Finish()
+
+	logger := mock_adaptors.NewLogger(t, ctrl)
+	logger.EXPECT().
+		IsEnabled(adaptors.LogLevel(logLevelDumpBody)).
+		Return(true)
+
+	transport := &LoggingTransport{
+		Logger: logger,
+	}
+	if transport.IsDumpBodyEnabled() != true {
+		t.Errorf("IsDumpBodyEnabled wants true")
+	}
+}
--- a/kubeconfig/auth.go
+++ b/kubeconfig/auth.go
@@ -1,52 +1,56 @@
 package kubeconfig

 import (
-	"fmt"
-
-	"k8s.io/client-go/tools/clientcmd/api"
+	"strings"
 )

-// FindCurrentAuthInfo returns the authInfo of current context.
-// If the current context does not exist, this returns nil.
-func FindCurrentAuthInfo(config *api.Config) *api.AuthInfo {
-	context := config.Contexts[config.CurrentContext]
-	if context == nil {
-		return nil
-	}
-	return config.AuthInfos[context.AuthInfo]
-}
-
-func ToOIDCAuthProviderConfig(authInfo *api.AuthInfo) (*OIDCAuthProviderConfig, error) {
-	if authInfo.AuthProvider == nil {
-		return nil, fmt.Errorf("auth-provider is not set, did you setup kubectl as listed here: https://github.com/int128/kubelogin#3-setup-kubectl")
-	}
-	if authInfo.AuthProvider.Name != "oidc" {
-		return nil, fmt.Errorf("auth-provider `%s` is not supported", authInfo.AuthProvider.Name)
-	}
-	return (*OIDCAuthProviderConfig)(authInfo.AuthProvider), nil
-}
-
-type OIDCAuthProviderConfig api.AuthProviderConfig
+// OIDCConfig represents config of an oidc auth-provider.
+type OIDCConfig map[string]string

 // IDPIssuerURL returns the idp-issuer-url.
-func (c *OIDCAuthProviderConfig) IDPIssuerURL() string {
-	return c.Config["idp-issuer-url"]
+func (c OIDCConfig) IDPIssuerURL() string {
+	return c["idp-issuer-url"]
 }

 // ClientID returns the client-id.
-func (c *OIDCAuthProviderConfig) ClientID() string {
-	return c.Config["client-id"]
+func (c OIDCConfig) ClientID() string {
+	return c["client-id"]
 }

 // ClientSecret returns the client-secret.
-func (c *OIDCAuthProviderConfig) ClientSecret() string {
-	return c.Config["client-secret"]
+func (c OIDCConfig) ClientSecret() string {
+	return c["client-secret"]
 }

-func (c *OIDCAuthProviderConfig) SetIDToken(idToken string) {
-	c.Config["id-token"] = idToken
+// IDPCertificateAuthority returns the idp-certificate-authority.
+func (c OIDCConfig) IDPCertificateAuthority() string {
+	return c["idp-certificate-authority"]
 }

-func (c *OIDCAuthProviderConfig) SetRefreshToken(refreshToken string) {
-	c.Config["refresh-token"] = refreshToken
+// IDPCertificateAuthorityData returns the idp-certificate-authority-data.
+func (c OIDCConfig) IDPCertificateAuthorityData() string {
+	return c["idp-certificate-authority-data"]
+}
+
+// ExtraScopes returns the extra-scopes.
+func (c OIDCConfig) ExtraScopes() []string {
+	if c["extra-scopes"] == "" {
+		return []string{}
+	}
+	return strings.Split(c["extra-scopes"], ",")
+}
+
+// IDToken returns the id-token.
+func (c OIDCConfig) IDToken() string {
+	return c["id-token"]
+}
+
+// SetIDToken replaces the id-token.
+func (c OIDCConfig) SetIDToken(idToken string) {
+	c["id-token"] = idToken
+}
+
+// SetRefreshToken replaces the refresh-token.
+func (c OIDCConfig) SetRefreshToken(refreshToken string) {
+	c["refresh-token"] = refreshToken
 }
--- a/kubeconfig/kubeconfig.go
+++ b/kubeconfig/kubeconfig.go
@@ -1,48 +1,66 @@
+// Package kubeconfig provides the models of kubeconfig file.
 package kubeconfig

 import (
-	"fmt"
-	"os"
-
-	homedir "github.com/mitchellh/go-homedir"
-	"k8s.io/client-go/tools/clientcmd"
+	"github.com/pkg/errors"
 	"k8s.io/client-go/tools/clientcmd/api"
 )

-const userKubeConfig = "~/.kube/config"
+type ContextName string
+type UserName string

-// Find returns path to the kubeconfig file,
-// that is given by env:KUBECONFIG or ~/.kube/config.
-// This returns an error if it is not found or I/O error occurred.
-func Find() (string, error) {
-	path := os.Getenv("KUBECONFIG")
-	if path == "" {
-		var err error
-		path, err = homedir.Expand(userKubeConfig)
-		if err != nil {
-			return "", fmt.Errorf("Could not expand %s: %s", userKubeConfig, err)
+// Config represents a config.
+type Config api.Config
+
+// Context represents a context.
+type Context api.Context
+
+// User represents a user.
+type User api.AuthInfo
+
+// CurrentAuth represents the current authentication, that is,
+// context, user and auth-provider.
+type CurrentAuth struct {
+	ContextName ContextName // empty if UserName is given
+	Context     *Context    // nil if UserName is given
+	UserName    UserName
+	User        *User
+	OIDCConfig  OIDCConfig
+}
+
+// FindCurrentAuth resolves the current context and user.
+// If contextName is given, this returns the user of the context.
+// If userName is given, this ignores the context and returns the user.
+// If any context or user is not found, this returns an error.
+func FindCurrentAuth(config *Config, contextName ContextName, userName UserName) (*CurrentAuth, error) {
+	var kubeContext *Context
+	if userName == "" {
+		if contextName == "" {
+			contextName = ContextName(config.CurrentContext)
 		}
+		contextNode := config.Contexts[string(contextName)]
+		if contextNode == nil {
+			return nil, errors.Errorf("context %s does not exist", contextName)
+		}
+		kubeContext = (*Context)(contextNode)
+		userName = UserName(kubeContext.AuthInfo)
 	}
-	info, err := os.Stat(path)
-	if err != nil {
-		return "", fmt.Errorf("Could not stat %s: %s", userKubeConfig, err)
+	userNode := config.AuthInfos[string(userName)]
+	if userNode == nil {
+		return nil, errors.Errorf("user %s does not exist", userName)
 	}
-	if info.IsDir() {
-		return "", fmt.Errorf("%s should be a file", userKubeConfig)
+	user := (*User)(userNode)
+	if user.AuthProvider == nil {
+		return nil, errors.Errorf("auth-provider is missing")
 	}
-	return path, nil
-}
-
-// Load loads the file and returns the Config.
-func Load(path string) (*api.Config, error) {
-	config, err := clientcmd.LoadFromFile(path)
-	if err != nil {
-		return nil, fmt.Errorf("Could not load kubeconfig from %s: %s", path, err)
-	}
-	return config, nil
-}
-
-// Write writes the config to the file.
-func Write(config *api.Config, path string) error {
-	return clientcmd.WriteToFile(*config, path)
+	if user.AuthProvider.Name != "oidc" {
+		return nil, errors.Errorf("auth-provider must be oidc but is %s", user.AuthProvider.Name)
+	}
+	return &CurrentAuth{
+		ContextName: contextName,
+		Context:     kubeContext,
+		UserName:    userName,
+		User:        user,
+		OIDCConfig:  user.AuthProvider.Config,
+	}, nil
 }
--- a/kubelogin.rb
+++ b/kubelogin.rb
@@ -0,0 +1,15 @@
+class Kubelogin < Formula
+  desc "A kubectl plugin for Kubernetes OpenID Connect authentication"
+  homepage "https://github.com/int128/kubelogin"
+  url "https://github.com/int128/kubelogin/releases/download/{{ env "VERSION" }}/kubelogin_darwin_amd64.zip"
+  version "{{ env "VERSION" }}"
+  sha256 "{{ sha256 .darwin_amd64_archive }}"
+  def install
+    bin.install "kubelogin" => "kubelogin"
+    ln_s bin/"kubelogin", bin/"kubectl-oidc_login"
+  end
+  test do
+    system "#{bin}/kubelogin -h"
+    system "#{bin}/kubectl-oidc_login -h"
+  end
+end
--- a/main.go
+++ b/main.go
@@ -3,39 +3,18 @@ package main
 import (
 	"context"
 	"log"
+	"os"

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

+var version = "HEAD"
+
 func main() {
-	path, err := kubeconfig.Find()
-	if err != nil {
-		log.Fatalf("Could not find kubeconfig: %s", err)
+	if err := di.Invoke(func(cmd adaptors.Cmd) {
+		os.Exit(cmd.Run(context.Background(), os.Args, version))
+	}); err != nil {
+		log.Fatalf("Error: %s", err)
 	}
-	log.Printf("Reading %s", path)
-	cfg, err := kubeconfig.Load(path)
-	if err != nil {
-		log.Fatalf("Could not load kubeconfig: %s", err)
-	}
-	log.Printf("Using current context: %s", cfg.CurrentContext)
-	authInfo := kubeconfig.FindCurrentAuthInfo(cfg)
-	if authInfo == nil {
-		log.Fatalf("Could not find current context: %s", cfg.CurrentContext)
-	}
-	authProvider, err := kubeconfig.ToOIDCAuthProviderConfig(authInfo)
-	if err != nil {
-		log.Fatalf("Could not find auth-provider: %s", err)
-	}
-
-	ctx := context.Background()
-	token, err := authn.GetTokenSet(ctx, authProvider.IDPIssuerURL(), authProvider.ClientID(), authProvider.ClientSecret())
-	if err != nil {
-		log.Fatalf("Authentication error: %s", err)
-	}
-
-	authProvider.SetIDToken(token.IDToken)
-	authProvider.SetRefreshToken(token.RefreshToken)
-	kubeconfig.Write(cfg, path)
-	log.Printf("Updated %s", path)
 }
--- a/oidc-login.yaml
+++ b/oidc-login.yaml
@@ -0,0 +1,57 @@
+apiVersion: krew.googlecontainertools.github.com/v1alpha2
+kind: Plugin
+metadata:
+  name: oidc-login
+spec:
+  shortDescription: Login for OpenID Connect authentication
+  description: |
+    This plugin gets a token from the OIDC provider and writes it to the kubeconfig.
+
+    Just run:
+      % kubectl oidc-login
+
+    It opens the browser and you can log in to the provider.
+    After authentication, it gets an ID token and refresh token and writes them to the kubeconfig.
+
+  caveats: |
+    You need to setup the following components:
+      * OIDC provider
+      * Kubernetes API server
+      * Role for your group or user
+      * kubectl authentication
+
+    See https://github.com/int128/kubelogin for more.
+
+  homepage: https://github.com/int128/kubelogin
+  version: {{ env "VERSION" }}
+  platforms:
+    - uri: https://github.com/int128/kubelogin/releases/download/{{ env "VERSION" }}/kubelogin_linux_amd64.zip
+      sha256: "{{ sha256 .linux_amd64_archive }}"
+      bin: kubelogin
+      files:
+        - from: "kubelogin"
+          to: "."
+      selector:
+        matchLabels:
+          os: linux
+          arch: amd64
+    - uri: https://github.com/int128/kubelogin/releases/download/{{ env "VERSION" }}/kubelogin_darwin_amd64.zip
+      sha256: "{{ sha256 .darwin_amd64_archive }}"
+      bin: kubelogin
+      files:
+        - from: "kubelogin"
+          to: "."
+      selector:
+        matchLabels:
+          os: darwin
+          arch: amd64
+    - uri: https://github.com/int128/kubelogin/releases/download/{{ env "VERSION" }}/kubelogin_windows_amd64.zip
+      sha256: "{{ sha256 .windows_amd64_archive }}"
+      bin: kubelogin.exe
+      files:
+        - from: "kubelogin.exe"
+          to: "."
+      selector:
+        matchLabels:
+          os: windows
+          arch: amd64
--- a/usecases/interfaces/usecases.go
+++ b/usecases/interfaces/usecases.go
@@ -0,0 +1,23 @@
+package usecases
+
+import (
+	"context"
+
+	"github.com/int128/kubelogin/kubeconfig"
+)
+
+//go:generate mockgen -package mock_usecases -destination ../mock_usecases/mock_usecases.go github.com/int128/kubelogin/usecases/interfaces Login
+
+type Login interface {
+	Do(ctx context.Context, in LoginIn) error
+}
+
+type LoginIn struct {
+	KubeConfigFilename           string                 // Default to the environment variable or global config as kubectl
+	KubeContextName              kubeconfig.ContextName // Default to the current context but ignored if KubeUserName is set
+	KubeUserName                 kubeconfig.UserName    // Default to the user of the context
+	CertificateAuthorityFilename string                 // Optional
+	SkipTLSVerify                bool
+	SkipOpenBrowser              bool
+	ListenPort                   []int
+}
--- a/usecases/login.go
+++ b/usecases/login.go
@@ -0,0 +1,123 @@
+package usecases
+
+import (
+	"context"
+
+	"github.com/coreos/go-oidc"
+	"github.com/int128/kubelogin/adaptors/interfaces"
+	"github.com/int128/kubelogin/kubeconfig"
+	"github.com/int128/kubelogin/usecases/interfaces"
+	"github.com/pkg/errors"
+	"go.uber.org/dig"
+)
+
+const oidcConfigErrorMessage = `No OIDC configuration found. Did you setup kubectl for OIDC authentication?
+  kubectl config set-credentials CONTEXT_NAME \
+    --auth-provider oidc \
+    --auth-provider-arg idp-issuer-url=https://issuer.example.com \
+    --auth-provider-arg client-id=YOUR_CLIENT_ID \
+    --auth-provider-arg client-secret=YOUR_CLIENT_SECRET`
+
+func NewLogin(i Login) usecases.Login {
+	return &i
+}
+
+type Login struct {
+	dig.In
+	KubeConfig adaptors.KubeConfig
+	HTTP       adaptors.HTTP
+	OIDC       adaptors.OIDC
+	Logger     adaptors.Logger
+}
+
+func (u *Login) Do(ctx context.Context, in usecases.LoginIn) error {
+	u.Logger.Debugf(1, "WARNING: log may contain your secrets such as token or password")
+
+	mergedKubeConfig, err := u.KubeConfig.LoadByDefaultRules(in.KubeConfigFilename)
+	if err != nil {
+		return errors.Wrapf(err, "could not load the kubeconfig")
+	}
+	auth, err := kubeconfig.FindCurrentAuth(mergedKubeConfig, in.KubeContextName, in.KubeUserName)
+	if err != nil {
+		u.Logger.Printf(oidcConfigErrorMessage)
+		return errors.Wrapf(err, "could not find the current authentication provider")
+	}
+	u.Logger.Debugf(1, "Using the authentication provider of the user %s", auth.UserName)
+	destinationKubeConfigFilename := auth.User.LocationOfOrigin
+	if destinationKubeConfigFilename == "" {
+		return errors.Errorf("could not determine the kubeconfig to write")
+	}
+	u.Logger.Debugf(1, "A token will be written to %s", destinationKubeConfigFilename)
+
+	hc, err := u.HTTP.NewClient(adaptors.HTTPClientConfig{
+		OIDCConfig:                   auth.OIDCConfig,
+		CertificateAuthorityFilename: in.CertificateAuthorityFilename,
+		SkipTLSVerify:                in.SkipTLSVerify,
+	})
+	if err != nil {
+		return errors.Wrapf(err, "could not set up a HTTP client")
+	}
+
+	if auth.OIDCConfig.IDToken() != "" {
+		u.Logger.Debugf(1, "Found the ID token in the kubeconfig")
+		token, err := u.OIDC.Verify(ctx, adaptors.OIDCVerifyIn{Config: auth.OIDCConfig, Client: hc})
+		if err == nil {
+			u.Logger.Printf("You already have a valid token until %s", token.Expiry)
+			u.dumpIDToken(token)
+			return nil
+		}
+		u.Logger.Debugf(1, "The ID token was invalid: %s", err)
+	}
+
+	out, err := u.OIDC.Authenticate(ctx,
+		adaptors.OIDCAuthenticateIn{
+			Config:          auth.OIDCConfig,
+			Client:          hc,
+			LocalServerPort: in.ListenPort,
+			SkipOpenBrowser: in.SkipOpenBrowser,
+		},
+		adaptors.OIDCAuthenticateCallback{
+			ShowLocalServerURL: func(url string) {
+				u.Logger.Printf("Open %s for authentication", url)
+			},
+		})
+	if err != nil {
+		return errors.Wrapf(err, "could not get a token from the OIDC provider")
+	}
+	u.Logger.Printf("You got a valid token until %s", out.VerifiedIDToken.Expiry)
+	u.dumpIDToken(out.VerifiedIDToken)
+
+	if err := u.writeToken(destinationKubeConfigFilename, auth.UserName, out); err != nil {
+		return errors.Wrapf(err, "could not write the token to the kubeconfig")
+	}
+	return nil
+}
+
+func (u *Login) dumpIDToken(token *oidc.IDToken) {
+	var claims map[string]interface{}
+	if err := token.Claims(&claims); err != nil {
+		u.Logger.Debugf(1, "Error while inspection of the ID token: %s", err)
+	}
+	for k, v := range claims {
+		u.Logger.Debugf(1, "The ID token has the claim: %s=%v", k, v)
+	}
+}
+
+func (u *Login) writeToken(filename string, userName kubeconfig.UserName, out *adaptors.OIDCAuthenticateOut) error {
+	config, err := u.KubeConfig.LoadFromFile(filename)
+	if err != nil {
+		return errors.Wrapf(err, "could not load %s", filename)
+	}
+	auth, err := kubeconfig.FindCurrentAuth(config, "", userName)
+	if err != nil {
+		return errors.Wrapf(err, "could not find the user %s in %s", userName, filename)
+	}
+	auth.OIDCConfig.SetIDToken(out.IDToken)
+	auth.OIDCConfig.SetRefreshToken(out.RefreshToken)
+	u.Logger.Debugf(1, "Writing the ID token and refresh token to %s", filename)
+	if err := u.KubeConfig.WriteToFile(config, filename); err != nil {
+		return errors.Wrapf(err, "could not update %s", filename)
+	}
+	u.Logger.Printf("Updated %s", filename)
+	return nil
+}
--- a/usecases/login_test.go
+++ b/usecases/login_test.go
@@ -0,0 +1,586 @@
+package usecases
+
+import (
+	"context"
+	"net/http"
+	"testing"
+
+	"github.com/coreos/go-oidc"
+	"github.com/golang/mock/gomock"
+	"github.com/int128/kubelogin/adaptors/interfaces"
+	"github.com/int128/kubelogin/adaptors/mock_adaptors"
+	"github.com/int128/kubelogin/kubeconfig"
+	"github.com/int128/kubelogin/usecases/interfaces"
+	"github.com/pkg/errors"
+	"k8s.io/client-go/tools/clientcmd/api"
+)
+
+type loginTestFixture struct {
+	googleOIDCConfig            kubeconfig.OIDCConfig
+	googleOIDCConfigWithToken   kubeconfig.OIDCConfig
+	googleKubeConfig            *kubeconfig.Config
+	googleKubeConfigWithToken   *kubeconfig.Config
+	keycloakOIDCConfig          kubeconfig.OIDCConfig
+	keycloakOIDCConfigWithToken kubeconfig.OIDCConfig
+	keycloakKubeConfig          *kubeconfig.Config
+	keycloakKubeConfigWithToken *kubeconfig.Config
+	mergedKubeConfig            *kubeconfig.Config
+}
+
+func newLoginTestFixture() loginTestFixture {
+	var f loginTestFixture
+	f.googleOIDCConfig = kubeconfig.OIDCConfig{
+		"client-id":      "GOOGLE_CLIENT_ID",
+		"client-secret":  "GOOGLE_CLIENT_SECRET",
+		"idp-issuer-url": "https://accounts.google.com",
+	}
+	f.googleKubeConfig = &kubeconfig.Config{
+		APIVersion:     "v1",
+		CurrentContext: "googleContext",
+		Contexts: map[string]*api.Context{
+			"googleContext": {
+				LocationOfOrigin: "/path/to/google",
+				AuthInfo:         "google",
+				Cluster:          "example.k8s.local",
+			},
+		},
+		AuthInfos: map[string]*api.AuthInfo{
+			"google": {
+				LocationOfOrigin: "/path/to/google",
+				AuthProvider: &api.AuthProviderConfig{
+					Name:   "oidc",
+					Config: f.googleOIDCConfig,
+				},
+			},
+		},
+	}
+	f.googleOIDCConfigWithToken = kubeconfig.OIDCConfig{
+		"client-id":      "GOOGLE_CLIENT_ID",
+		"client-secret":  "GOOGLE_CLIENT_SECRET",
+		"idp-issuer-url": "https://accounts.google.com",
+		"id-token":       "YOUR_ID_TOKEN",
+		"refresh-token":  "YOUR_REFRESH_TOKEN",
+	}
+	f.googleKubeConfigWithToken = &kubeconfig.Config{
+		APIVersion:     "v1",
+		CurrentContext: "googleContext",
+		Contexts: map[string]*api.Context{
+			"googleContext": {
+				LocationOfOrigin: "/path/to/google",
+				AuthInfo:         "google",
+				Cluster:          "example.k8s.local",
+			},
+		},
+		AuthInfos: map[string]*api.AuthInfo{
+			"google": {
+				LocationOfOrigin: "/path/to/google",
+				AuthProvider: &api.AuthProviderConfig{
+					Name:   "oidc",
+					Config: f.googleOIDCConfigWithToken,
+				},
+			},
+		},
+	}
+
+	f.keycloakOIDCConfig = kubeconfig.OIDCConfig{
+		"client-id":      "KEYCLOAK_CLIENT_ID",
+		"client-secret":  "KEYCLOAK_CLIENT_SECRET",
+		"idp-issuer-url": "https://keycloak.example.com",
+	}
+	f.keycloakKubeConfig = &kubeconfig.Config{
+		APIVersion:     "v1",
+		CurrentContext: "googleContext",
+		Contexts: map[string]*api.Context{
+			"keycloakContext": {
+				LocationOfOrigin: "/path/to/keycloak",
+				AuthInfo:         "keycloak",
+				Cluster:          "example.k8s.local",
+			},
+		},
+		AuthInfos: map[string]*api.AuthInfo{
+			"keycloak": {
+				LocationOfOrigin: "/path/to/keycloak",
+				AuthProvider: &api.AuthProviderConfig{
+					Name:   "oidc",
+					Config: f.keycloakOIDCConfig,
+				},
+			},
+		},
+	}
+	f.keycloakOIDCConfigWithToken = kubeconfig.OIDCConfig{
+		"client-id":      "KEYCLOAK_CLIENT_ID",
+		"client-secret":  "KEYCLOAK_CLIENT_SECRET",
+		"idp-issuer-url": "https://keycloak.example.com",
+		"id-token":       "YOUR_ID_TOKEN",
+		"refresh-token":  "YOUR_REFRESH_TOKEN",
+	}
+	f.keycloakKubeConfigWithToken = &kubeconfig.Config{
+		APIVersion:     "v1",
+		CurrentContext: "googleContext",
+		Contexts: map[string]*api.Context{
+			"keycloakContext": {
+				LocationOfOrigin: "/path/to/keycloak",
+				AuthInfo:         "keycloak",
+				Cluster:          "example.k8s.local",
+			},
+		},
+		AuthInfos: map[string]*api.AuthInfo{
+			"keycloak": {
+				LocationOfOrigin: "/path/to/keycloak",
+				AuthProvider: &api.AuthProviderConfig{
+					Name:   "oidc",
+					Config: f.keycloakOIDCConfigWithToken,
+				},
+			},
+		},
+	}
+
+	f.mergedKubeConfig = &kubeconfig.Config{
+		APIVersion:     "v1",
+		CurrentContext: "googleContext",
+		Contexts: map[string]*api.Context{
+			"googleContext": {
+				LocationOfOrigin: "/path/to/google",
+				AuthInfo:         "google",
+				Cluster:          "example.k8s.local",
+			},
+			"keycloakContext": {
+				LocationOfOrigin: "/path/to/keycloak",
+				AuthInfo:         "keycloak",
+				Cluster:          "example.k8s.local",
+			},
+		},
+		AuthInfos: map[string]*api.AuthInfo{
+			"google": {
+				LocationOfOrigin: "/path/to/google",
+				AuthProvider: &api.AuthProviderConfig{
+					Name:   "oidc",
+					Config: f.googleOIDCConfig,
+				},
+			},
+			"keycloak": {
+				LocationOfOrigin: "/path/to/keycloak",
+				AuthProvider: &api.AuthProviderConfig{
+					Name:   "oidc",
+					Config: f.keycloakOIDCConfig,
+				},
+			},
+		},
+	}
+	return f
+}
+
+func TestLogin_Do(t *testing.T) {
+	httpClient := &http.Client{}
+
+	newMockOIDC := func(ctrl *gomock.Controller, ctx context.Context, in adaptors.OIDCAuthenticateIn) *mock_adaptors.MockOIDC {
+		mockOIDC := mock_adaptors.NewMockOIDC(ctrl)
+		mockOIDC.EXPECT().
+			Authenticate(ctx, in, gomock.Any()).
+			Do(func(_ context.Context, _ adaptors.OIDCAuthenticateIn, cb adaptors.OIDCAuthenticateCallback) {
+				cb.ShowLocalServerURL("http://localhost:10000")
+			}).
+			Return(&adaptors.OIDCAuthenticateOut{
+				VerifiedIDToken: &oidc.IDToken{Subject: "SUBJECT"},
+				IDToken:         "YOUR_ID_TOKEN",
+				RefreshToken:    "YOUR_REFRESH_TOKEN",
+			}, nil)
+		return mockOIDC
+	}
+
+	t.Run("Defaults", func(t *testing.T) {
+		ctrl := gomock.NewController(t)
+		defer ctrl.Finish()
+		ctx := context.TODO()
+		f := newLoginTestFixture()
+
+		mockHTTP := mock_adaptors.NewMockHTTP(ctrl)
+		mockHTTP.EXPECT().
+			NewClient(adaptors.HTTPClientConfig{
+				OIDCConfig: f.googleOIDCConfig,
+			}).
+			Return(httpClient, nil)
+
+		mockKubeConfig := mock_adaptors.NewMockKubeConfig(ctrl)
+		mockKubeConfig.EXPECT().
+			LoadByDefaultRules("").
+			Return(f.mergedKubeConfig, nil)
+		mockKubeConfig.EXPECT().
+			LoadFromFile("/path/to/google").
+			Return(f.googleKubeConfig, nil)
+		mockKubeConfig.EXPECT().
+			WriteToFile(f.googleKubeConfigWithToken, "/path/to/google")
+
+		oidcIn := adaptors.OIDCAuthenticateIn{
+			Config:          f.googleOIDCConfig,
+			LocalServerPort: []int{10000},
+			Client:          httpClient,
+		}
+
+		u := Login{
+			KubeConfig: mockKubeConfig,
+			HTTP:       mockHTTP,
+			OIDC:       newMockOIDC(ctrl, ctx, oidcIn),
+			Logger:     mock_adaptors.NewLogger(t, ctrl),
+		}
+		if err := u.Do(ctx, usecases.LoginIn{
+			ListenPort: []int{10000},
+		}); err != nil {
+			t.Errorf("Do returned error: %+v", err)
+		}
+	})
+
+	t.Run("KubeConfigFilename", func(t *testing.T) {
+		ctrl := gomock.NewController(t)
+		defer ctrl.Finish()
+		ctx := context.TODO()
+		f := newLoginTestFixture()
+
+		mockHTTP := mock_adaptors.NewMockHTTP(ctrl)
+		mockHTTP.EXPECT().
+			NewClient(adaptors.HTTPClientConfig{
+				OIDCConfig: f.googleOIDCConfig,
+			}).
+			Return(httpClient, nil)
+
+		mockKubeConfig := mock_adaptors.NewMockKubeConfig(ctrl)
+		mockKubeConfig.EXPECT().
+			LoadByDefaultRules("/path/to/kubeconfig").
+			Return(f.mergedKubeConfig, nil)
+		mockKubeConfig.EXPECT().
+			LoadFromFile("/path/to/google").
+			Return(f.googleKubeConfig, nil)
+		mockKubeConfig.EXPECT().
+			WriteToFile(f.googleKubeConfigWithToken, "/path/to/google")
+
+		oidcIn := adaptors.OIDCAuthenticateIn{
+			Config:          f.googleOIDCConfig,
+			LocalServerPort: []int{10000},
+			Client:          httpClient,
+		}
+
+		u := Login{
+			KubeConfig: mockKubeConfig,
+			HTTP:       mockHTTP,
+			OIDC:       newMockOIDC(ctrl, ctx, oidcIn),
+			Logger:     mock_adaptors.NewLogger(t, ctrl),
+		}
+		if err := u.Do(ctx, usecases.LoginIn{
+			KubeConfigFilename: "/path/to/kubeconfig",
+			ListenPort:         []int{10000},
+		}); err != nil {
+			t.Errorf("Do returned error: %+v", err)
+		}
+	})
+
+	t.Run("KubeContextName", func(t *testing.T) {
+		ctrl := gomock.NewController(t)
+		defer ctrl.Finish()
+		ctx := context.TODO()
+		f := newLoginTestFixture()
+
+		mockHTTP := mock_adaptors.NewMockHTTP(ctrl)
+		mockHTTP.EXPECT().
+			NewClient(adaptors.HTTPClientConfig{
+				OIDCConfig: f.keycloakOIDCConfig,
+			}).
+			Return(httpClient, nil)
+
+		mockKubeConfig := mock_adaptors.NewMockKubeConfig(ctrl)
+		mockKubeConfig.EXPECT().
+			LoadByDefaultRules("").
+			Return(f.mergedKubeConfig, nil)
+		mockKubeConfig.EXPECT().
+			LoadFromFile("/path/to/keycloak").
+			Return(f.keycloakKubeConfig, nil)
+		mockKubeConfig.EXPECT().
+			WriteToFile(f.keycloakKubeConfigWithToken, "/path/to/keycloak")
+
+		oidcIn := adaptors.OIDCAuthenticateIn{
+			Config:          f.keycloakOIDCConfig,
+			LocalServerPort: []int{10000},
+			Client:          httpClient,
+		}
+
+		u := Login{
+			KubeConfig: mockKubeConfig,
+			HTTP:       mockHTTP,
+			OIDC:       newMockOIDC(ctrl, ctx, oidcIn),
+			Logger:     mock_adaptors.NewLogger(t, ctrl),
+		}
+		if err := u.Do(ctx, usecases.LoginIn{
+			KubeContextName: "keycloakContext",
+			ListenPort:      []int{10000},
+		}); err != nil {
+			t.Errorf("Do returned error: %+v", err)
+		}
+	})
+
+	t.Run("KubeUserName", func(t *testing.T) {
+		ctrl := gomock.NewController(t)
+		defer ctrl.Finish()
+		ctx := context.TODO()
+		f := newLoginTestFixture()
+
+		mockHTTP := mock_adaptors.NewMockHTTP(ctrl)
+		mockHTTP.EXPECT().
+			NewClient(adaptors.HTTPClientConfig{
+				OIDCConfig: f.keycloakOIDCConfig,
+			}).
+			Return(httpClient, nil)
+
+		mockKubeConfig := mock_adaptors.NewMockKubeConfig(ctrl)
+		mockKubeConfig.EXPECT().
+			LoadByDefaultRules("").
+			Return(f.mergedKubeConfig, nil)
+		mockKubeConfig.EXPECT().
+			LoadFromFile("/path/to/keycloak").
+			Return(f.keycloakKubeConfig, nil)
+		mockKubeConfig.EXPECT().
+			WriteToFile(f.keycloakKubeConfigWithToken, "/path/to/keycloak")
+
+		oidcIn := adaptors.OIDCAuthenticateIn{
+			Config:          f.keycloakOIDCConfig,
+			LocalServerPort: []int{10000},
+			Client:          httpClient,
+		}
+
+		u := Login{
+			KubeConfig: mockKubeConfig,
+			HTTP:       mockHTTP,
+			OIDC:       newMockOIDC(ctrl, ctx, oidcIn),
+			Logger:     mock_adaptors.NewLogger(t, ctrl),
+		}
+		if err := u.Do(ctx, usecases.LoginIn{
+			KubeUserName: "keycloak",
+			ListenPort:   []int{10000},
+		}); err != nil {
+			t.Errorf("Do returned error: %+v", err)
+		}
+	})
+
+	t.Run("SkipTLSVerify", func(t *testing.T) {
+		ctrl := gomock.NewController(t)
+		defer ctrl.Finish()
+		ctx := context.TODO()
+		f := newLoginTestFixture()
+
+		mockHTTP := mock_adaptors.NewMockHTTP(ctrl)
+		mockHTTP.EXPECT().
+			NewClient(adaptors.HTTPClientConfig{
+				OIDCConfig:    f.googleOIDCConfig,
+				SkipTLSVerify: true,
+			}).
+			Return(httpClient, nil)
+
+		mockKubeConfig := mock_adaptors.NewMockKubeConfig(ctrl)
+		mockKubeConfig.EXPECT().
+			LoadByDefaultRules("").
+			Return(f.mergedKubeConfig, nil)
+		mockKubeConfig.EXPECT().
+			LoadFromFile("/path/to/google").
+			Return(f.googleKubeConfig, nil)
+		mockKubeConfig.EXPECT().
+			WriteToFile(f.googleKubeConfigWithToken, "/path/to/google")
+
+		oidcIn := adaptors.OIDCAuthenticateIn{
+			Config:          f.googleOIDCConfig,
+			LocalServerPort: []int{10000},
+			Client:          httpClient,
+		}
+
+		u := Login{
+			KubeConfig: mockKubeConfig,
+			HTTP:       mockHTTP,
+			OIDC:       newMockOIDC(ctrl, ctx, oidcIn),
+			Logger:     mock_adaptors.NewLogger(t, ctrl),
+		}
+		if err := u.Do(ctx, usecases.LoginIn{
+			ListenPort:    []int{10000},
+			SkipTLSVerify: true,
+		}); err != nil {
+			t.Errorf("Do returned error: %+v", err)
+		}
+	})
+
+	t.Run("SkipOpenBrowser", func(t *testing.T) {
+		ctrl := gomock.NewController(t)
+		defer ctrl.Finish()
+		ctx := context.TODO()
+		f := newLoginTestFixture()
+
+		mockHTTP := mock_adaptors.NewMockHTTP(ctrl)
+		mockHTTP.EXPECT().
+			NewClient(adaptors.HTTPClientConfig{
+				OIDCConfig: f.googleOIDCConfig,
+			}).
+			Return(httpClient, nil)
+
+		mockKubeConfig := mock_adaptors.NewMockKubeConfig(ctrl)
+		mockKubeConfig.EXPECT().
+			LoadByDefaultRules("").
+			Return(f.mergedKubeConfig, nil)
+		mockKubeConfig.EXPECT().
+			LoadFromFile("/path/to/google").
+			Return(f.googleKubeConfig, nil)
+		mockKubeConfig.EXPECT().
+			WriteToFile(f.googleKubeConfigWithToken, "/path/to/google")
+
+		oidcIn := adaptors.OIDCAuthenticateIn{
+			Config:          f.googleOIDCConfig,
+			LocalServerPort: []int{10000},
+			Client:          httpClient,
+			SkipOpenBrowser: true,
+		}
+
+		u := Login{
+			KubeConfig: mockKubeConfig,
+			HTTP:       mockHTTP,
+			OIDC:       newMockOIDC(ctrl, ctx, oidcIn),
+			Logger:     mock_adaptors.NewLogger(t, ctrl),
+		}
+		if err := u.Do(ctx, usecases.LoginIn{
+			ListenPort:      []int{10000},
+			SkipOpenBrowser: true,
+		}); err != nil {
+			t.Errorf("Do returned error: %+v", err)
+		}
+	})
+
+	t.Run("KubeConfig/ValidToken", func(t *testing.T) {
+		ctrl := gomock.NewController(t)
+		defer ctrl.Finish()
+		ctx := context.TODO()
+		f := newLoginTestFixture()
+		f.googleOIDCConfig.SetIDToken("VALID_TOKEN")
+
+		mockHTTP := mock_adaptors.NewMockHTTP(ctrl)
+		mockHTTP.EXPECT().
+			NewClient(adaptors.HTTPClientConfig{
+				OIDCConfig: f.googleOIDCConfig,
+			}).
+			Return(httpClient, nil)
+
+		mockKubeConfig := mock_adaptors.NewMockKubeConfig(ctrl)
+		mockKubeConfig.EXPECT().
+			LoadByDefaultRules("").
+			Return(f.mergedKubeConfig, nil)
+
+		mockOIDC := mock_adaptors.NewMockOIDC(ctrl)
+		mockOIDC.EXPECT().
+			Verify(ctx, adaptors.OIDCVerifyIn{
+				Config: f.googleOIDCConfig,
+				Client: httpClient,
+			}).
+			Return(&oidc.IDToken{}, nil)
+
+		u := Login{
+			KubeConfig: mockKubeConfig,
+			HTTP:       mockHTTP,
+			OIDC:       mockOIDC,
+			Logger:     mock_adaptors.NewLogger(t, ctrl),
+		}
+		if err := u.Do(ctx, usecases.LoginIn{
+			ListenPort: []int{10000},
+		}); err != nil {
+			t.Errorf("Do returned error: %+v", err)
+		}
+	})
+
+	t.Run("KubeConfig/InvalidToken", func(t *testing.T) {
+		ctrl := gomock.NewController(t)
+		defer ctrl.Finish()
+		ctx := context.TODO()
+		f := newLoginTestFixture()
+		f.googleOIDCConfig.SetIDToken("EXPIRED_TOKEN")
+
+		mockHTTP := mock_adaptors.NewMockHTTP(ctrl)
+		mockHTTP.EXPECT().
+			NewClient(adaptors.HTTPClientConfig{
+				OIDCConfig: f.googleOIDCConfig,
+			}).
+			Return(httpClient, nil)
+
+		mockKubeConfig := mock_adaptors.NewMockKubeConfig(ctrl)
+		mockKubeConfig.EXPECT().
+			LoadByDefaultRules("").
+			Return(f.mergedKubeConfig, nil)
+		mockKubeConfig.EXPECT().
+			LoadFromFile("/path/to/google").
+			Return(f.googleKubeConfig, nil)
+		mockKubeConfig.EXPECT().
+			WriteToFile(f.googleKubeConfigWithToken, "/path/to/google")
+
+		mockOIDC := newMockOIDC(ctrl, ctx, adaptors.OIDCAuthenticateIn{
+			Config:          f.googleOIDCConfig,
+			LocalServerPort: []int{10000},
+			Client:          httpClient,
+		})
+		mockOIDC.EXPECT().
+			Verify(ctx, adaptors.OIDCVerifyIn{
+				Config: f.googleOIDCConfig,
+				Client: httpClient,
+			}).
+			Return(nil, errors.New("token is expired"))
+
+		u := Login{
+			KubeConfig: mockKubeConfig,
+			HTTP:       mockHTTP,
+			OIDC:       mockOIDC,
+			Logger:     mock_adaptors.NewLogger(t, ctrl),
+		}
+		if err := u.Do(ctx, usecases.LoginIn{
+			ListenPort: []int{10000},
+		}); err != nil {
+			t.Errorf("Do returned error: %+v", err)
+		}
+	})
+
+	t.Run("Certificates", func(t *testing.T) {
+		ctrl := gomock.NewController(t)
+		defer ctrl.Finish()
+		ctx := context.TODO()
+		f := newLoginTestFixture()
+		f.googleOIDCConfig["idp-certificate-authority"] = "/path/to/cert2"
+		f.googleOIDCConfig["idp-certificate-authority-data"] = "base64encoded"
+		f.googleOIDCConfigWithToken["idp-certificate-authority"] = "/path/to/cert2"
+		f.googleOIDCConfigWithToken["idp-certificate-authority-data"] = "base64encoded"
+
+		mockHTTP := mock_adaptors.NewMockHTTP(ctrl)
+		mockHTTP.EXPECT().
+			NewClient(adaptors.HTTPClientConfig{
+				OIDCConfig:                   f.googleOIDCConfig,
+				CertificateAuthorityFilename: "/path/to/cert1",
+			}).
+			Return(httpClient, nil)
+
+		mockKubeConfig := mock_adaptors.NewMockKubeConfig(ctrl)
+		mockKubeConfig.EXPECT().
+			LoadByDefaultRules("").
+			Return(f.mergedKubeConfig, nil)
+		mockKubeConfig.EXPECT().
+			LoadFromFile("/path/to/google").
+			Return(f.googleKubeConfig, nil)
+		mockKubeConfig.EXPECT().
+			WriteToFile(f.googleKubeConfigWithToken, "/path/to/google")
+
+		oidcIn := adaptors.OIDCAuthenticateIn{
+			Config:          f.googleOIDCConfig,
+			LocalServerPort: []int{10000},
+			Client:          httpClient,
+		}
+
+		u := Login{
+			KubeConfig: mockKubeConfig,
+			HTTP:       mockHTTP,
+			OIDC:       newMockOIDC(ctrl, ctx, oidcIn),
+			Logger:     mock_adaptors.NewLogger(t, ctrl),
+		}
+		if err := u.Do(ctx, usecases.LoginIn{
+			ListenPort:                   []int{10000},
+			CertificateAuthorityFilename: "/path/to/cert1",
+		}); err != nil {
+			t.Errorf("Do returned error: %+v", err)
+		}
+	})
+}
--- a/usecases/mock_usecases/mock_usecases.go
+++ b/usecases/mock_usecases/mock_usecases.go
@@ -0,0 +1,47 @@
+// Code generated by MockGen. DO NOT EDIT.
+// Source: github.com/int128/kubelogin/usecases/interfaces (interfaces: Login)
+
+// Package mock_usecases is a generated GoMock package.
+package mock_usecases
+
+import (
+	context "context"
+	gomock "github.com/golang/mock/gomock"
+	interfaces "github.com/int128/kubelogin/usecases/interfaces"
+	reflect "reflect"
+)
+
+// MockLogin is a mock of Login interface
+type MockLogin struct {
+	ctrl     *gomock.Controller
+	recorder *MockLoginMockRecorder
+}
+
+// MockLoginMockRecorder is the mock recorder for MockLogin
+type MockLoginMockRecorder struct {
+	mock *MockLogin
+}
+
+// NewMockLogin creates a new mock instance
+func NewMockLogin(ctrl *gomock.Controller) *MockLogin {
+	mock := &MockLogin{ctrl: ctrl}
+	mock.recorder = &MockLoginMockRecorder{mock}
+	return mock
+}
+
+// EXPECT returns an object that allows the caller to indicate expected use
+func (m *MockLogin) EXPECT() *MockLoginMockRecorder {
+	return m.recorder
+}
+
+// Do mocks base method
+func (m *MockLogin) Do(arg0 context.Context, arg1 interfaces.LoginIn) error {
+	ret := m.ctrl.Call(m, "Do", arg0, arg1)
+	ret0, _ := ret[0].(error)
+	return ret0
+}
+
+// Do indicates an expected call of Do
+func (mr *MockLoginMockRecorder) Do(arg0, arg1 interface{}) *gomock.Call {
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Do", reflect.TypeOf((*MockLogin)(nil).Do), arg0, arg1)
+}
Author	SHA1	Message	Date
Hidetake Iwata	7011f03094	Release v1.11.0	2019-05-16 21:59:50 +09:00
Hidetake Iwata	6aef98cef7	Bump to int128/oauth2cli:v1.4.0 (#82 )	2019-05-16 21:55:56 +09:00
Hidetake Iwata	93bb1d39b9	Add fallback ports for local server (#79 )	2019-05-16 20:38:45 +09:00
Hidetake Iwata	c8116e2eae	Update keycloak.md	2019-05-14 15:42:05 +09:00
Hidetake Iwata	f2de8dd987	Refactor log messages and etc. (#77 ) * Refactor log messages * Refactor token verification	2019-05-14 13:49:43 +09:00
Hidetake Iwata	915fb35bc8	Raise error on invalid certificate (as kubectl) (#73 )	2019-05-14 11:32:11 +09:00
Hidetake Iwata	51ccd70af3	go mod tidy	2019-05-14 11:26:06 +09:00
dependabot[bot]	c6df597fb0	Bump github.com/golang/mock from 1.3.0 to 1.3.1 (#76 ) Bumps [github.com/golang/mock](https://github.com/golang/mock) from 1.3.0 to 1.3.1. - [Release notes](https://github.com/golang/mock/releases) - [Commits](https://github.com/golang/mock/compare/v1.3.0...1.3.1) Signed-off-by: dependabot[bot] <support@dependabot.com>	2019-05-14 11:24:03 +09:00
Hidetake Iwata	ee78f6f735	Make integration tests in parallel (#75 )	2019-05-13 21:25:20 +09:00
Hidetake Iwata	6e484a2b89	Add golangci-lint (#74 ) * Add golangci-lint * Fix lint errors	2019-05-13 10:19:25 +09:00
Hidetake Iwata	8050db7e05	go mod tidy	2019-05-13 09:26:28 +09:00
dependabot[bot]	cd54ca0df0	Bump github.com/golang/mock from 1.2.0 to 1.3.0 (#71 ) Bumps [github.com/golang/mock](https://github.com/golang/mock) from 1.2.0 to 1.3.0. - [Release notes](https://github.com/golang/mock/releases) - [Commits](https://github.com/golang/mock/compare/v1.2.0...v1.3.0) Signed-off-by: dependabot[bot] <support@dependabot.com>	2019-05-04 17:58:42 +09:00
Hidetake Iwata	45f83b0b0e	Add multiple kubeconfig support (#70 )	2019-04-29 14:34:56 +09:00
Hidetake Iwata	51b7ca1600	Fix templates for the latest goxzst	2019-04-22 09:42:01 +09:00
Hidetake Iwata	83f85a9b53	Dump all claims of ID token to debug log (#68 ) * Dump all claims of ID token to debug log * Add dump when a user already has a token	2019-04-19 10:29:56 +09:00
Hidetake Iwata	d82c8a2dd1	Fix error of go get and remove golint (#69 ) * Remove golint * Fix error of go get github.com/int128/ghcp	2019-04-19 10:26:03 +09:00
Hidetake Iwata	072bee6992	Add --certificate-authority option (#67 )	2019-04-18 10:50:38 +09:00
Hidetake Iwata	5c07850a68	Add --user option (#66 )	2019-04-18 10:38:23 +09:00
Hidetake Iwata	5c8c80f055	Add --context option (#65 )	2019-04-18 10:12:48 +09:00
Hidetake Iwata	bc7bfabfb2	Move to pflags (#62 )	2019-04-17 16:58:17 +09:00
Hidetake Iwata	73112546de	Update README.md	2019-04-17 16:56:44 +09:00
Hidetake Iwata	356f0d519d	Add debug log feature (#58 )	2019-04-16 09:27:38 +09:00
Hidetake Iwata	e84d29bc6b	Fix flaky test (#61 )	2019-04-16 09:13:39 +09:00
Hidetake Iwata	ae80ebf148	Refactor: use dedicated Logger on authentication callback (#59 )	2019-04-14 14:49:12 +09:00
Nathaniel Irons	5942c82b5f	Change expected binary name to kubelogin (#57 )	2019-04-12 10:16:18 +09:00
Hidetake Iwata	a5f9c698ea	Bump Go to 1.12.3 (#56 )	2019-04-11 12:52:41 +09:00
Hidetake Iwata	40ef2c25b8	Update README.md	2019-04-11 10:48:19 +09:00
Hidetake Iwata	2422c46271	Refactor integration tests (#54 ) * Refactor integration tests * Refactor: move keys * Refactor authserver * Refactor: do not generate key on test runtime * Refactor: package keys in integration tests * Refactor: use context on sending browser request * Refactor: use testing.T logger on integration tests	2019-04-11 10:43:05 +09:00
Hidetake Iwata	6ca0ee8013	Skip login if kubeconfig has valid ID token (#52 ) * Skip login if kubeconfig has valid ID token * Add integration test for skip login feature	2019-04-10 10:20:13 +09:00
Hidetake Iwata	9ac252667a	Update README.md	2019-04-09 13:34:47 +09:00
Hidetake Iwata	000711f52e	Add support of HTTP_PROXY, HTTPS_PROXY and NO_PROXY (#51 )	2019-04-09 13:17:12 +09:00
Hidetake Iwata	e465c4852b	Introduce dig container (#50 )	2019-04-09 12:37:44 +09:00
Hidetake Iwata	003badb0bc	Fix nil pointer error (#49 )	2019-04-09 10:19:25 +09:00
Hidetake Iwata	0873a193a5	Refactor: extract adaptors.Logger	2019-04-08 16:07:26 +09:00
Hidetake Iwata	5e80b1858e	Refactor: logs	2019-04-08 16:07:26 +09:00
Hidetake Iwata	c816281657	Refactor: add test of usecases.Login	2019-04-08 13:35:01 +09:00
Hidetake Iwata	0db49860f9	Refactor: extract adaptors.HTTPClientConfig	2019-04-08 13:35:01 +09:00
Hidetake Iwata	d70c9db036	Refactor: extract adaptors.HTTP	2019-04-08 13:35:01 +09:00
Hidetake Iwata	675b5e5fff	Refactor: extract adaptors.OIDC	2019-04-08 13:35:01 +09:00
Hidetake Iwata	e3bfc321a2	Refactor: extract adaptors.KubeConfig	2019-04-08 13:35:01 +09:00
Hidetake Iwata	b34d0fb32f	Refactor: add di package	2019-04-08 13:35:01 +09:00
Hidetake Iwata	4c61a71ed4	Add test of adaptors.Cmd (#45 )	2019-04-07 19:33:53 +09:00
Hidetake Iwata	8a02ed0fb0	Split cli package into adaptors and use-cases (#44 )	2019-04-05 14:52:15 +09:00
Hidetake Iwata	3485c5408e	Replace with errors.Errorf() and errors.Wrapf() (#43 )	2019-04-05 12:12:00 +09:00
Hidetake Iwata	fb99977e98	Update README.md	2019-04-05 10:53:32 +09:00
Hidetake Iwata	39b441a7c2	Run go get at once	2019-04-05 10:40:23 +09:00
Hidetake Iwata	cde5becf67	Fix release in Makefile	2019-04-05 10:37:02 +09:00
Hidetake Iwata	460b14a159	Use CI context	2019-04-05 10:36:12 +09:00
Hidetake Iwata	8436fe3494	Merge pull request #42 from int128/krew Add yaml for Krew installation	2019-04-05 10:28:23 +09:00
Hidetake Iwata	9d2319ee2f	Do not set change log on release	2019-04-05 10:17:42 +09:00
Hidetake Iwata	75277378fc	Add yaml for krew installation	2019-04-05 10:17:42 +09:00
Hidetake Iwata	89a1046ce3	Use goxzst for release	2019-04-05 09:58:34 +09:00
Baykonur	15d40413e4	HTTPS_PROXY support for kubelogin (#41 ) adding HTTPS_PROXY support to kubelogin	2019-04-04 15:45:47 +09:00
Hidetake Iwata	8525ba5142	Merge pull request #40 from int128/refactor Rename plugin to kubectl oidc-login	2019-03-29 16:59:55 +09:00
Hidetake Iwata	dbddd6a07f	Rename plugin to kubectl oidc-login See the naming guide: https://github.com/GoogleContainerTools/krew/blob/master/docs/NAMING_GUIDE.md	2019-03-29 16:43:53 +09:00
Hidetake Iwata	839877b45e	Merge pull request #39 from int128/refactor Move to gox/ghr/ghcp to fix version of k8s modules	2019-03-29 16:29:48 +09:00
Hidetake Iwata	99ed86e22e	Move to gox/ghr/ghcp to fix version of k8s modules	2019-03-29 16:27:26 +09:00
Hidetake Iwata	a78b746c29	Exclude /.idea	2019-02-27 10:54:07 +09:00
Hidetake Iwata	187bbc203c	Merge pull request #32 from int128/dependabot/go_modules/github.com/mitchellh/go-homedir-1.1.0 Bump github.com/mitchellh/go-homedir from 1.0.0 to 1.1.0	2019-02-27 10:46:11 +09:00
dependabot[bot]	d4b5e511bb	Bump github.com/mitchellh/go-homedir from 1.0.0 to 1.1.0 Bumps [github.com/mitchellh/go-homedir](https://github.com/mitchellh/go-homedir) from 1.0.0 to 1.1.0. - [Release notes](https://github.com/mitchellh/go-homedir/releases) - [Commits](https://github.com/mitchellh/go-homedir/compare/v1.0.0...v1.1.0) Signed-off-by: dependabot[bot] <support@dependabot.com>	2019-01-28 20:20:06 +00:00
Hidetake Iwata	33241b8721	Update README.md	2018-11-20 16:46:02 +09:00
Hidetake Iwata	b72cb63826	Fix up #25	2018-11-09 13:26:35 +09:00
Hidetake Iwata	63fda1db0f	Merge pull request #25 from int128/kubectl-plugin Add kubectl plugin support	2018-11-09 11:39:52 +09:00
Hidetake Iwata	da95fe470f	Add kubectl plugin support	2018-11-09 11:37:38 +09:00
Hidetake Iwata	4b08a49a51	Add workaround for Go Modules issue	2018-10-31 14:21:33 +09:00
Hidetake Iwata	9c74f3748b	Merge pull request #23 from int128/oauth2cli Import github.com/int128/oauth2cli	2018-10-31 14:16:25 +09:00
Hidetake Iwata	17e03f2abc	Import github.com/int128/oauth2cli	2018-10-31 14:13:09 +09:00
Hidetake Iwata	ebef81f9d7	Merge pull request #22 from int128/ignore-cert-errors Skip invalid CA certs instead of raising error	2018-10-30 09:56:22 +09:00
Hidetake Iwata	8d0d82fb71	Skip invalid CA certs instead of raising error	2018-10-30 09:55:12 +09:00
Hidetake Iwata	b600e54a12	Refactor e2e test	2018-10-29 14:04:10 +09:00
Hidetake Iwata	75317f88a1	Merge pull request #21 from int128/go111 Move to Go Modules	2018-10-29 13:50:01 +09:00
Hidetake Iwata	5a794e8ceb	Move to Go Modules	2018-10-29 13:45:32 +09:00
Hidetake Iwata	1fe1ec4c20	Update README.md	2018-10-16 09:47:50 +09:00
Hidetake Iwata	7676ffbfab	Fix golint	2018-10-16 09:25:38 +09:00
Hidetake Iwata	7e1e6a096b	Refactor docs	2018-10-15 15:52:52 +09:00
Hidetake Iwata	4d3d1c3b78	Add explanation about extra scopes	2018-10-04 16:05:36 +09:00
Hidetake Iwata	1ebdfc0e4f	Use "Application Type: Other" on Google IdP	2018-10-03 15:33:56 +09:00
Hidetake Iwata	9c67c52b34	Fix test for #17	2018-09-14 15:06:05 +09:00
Hidetake Iwata	550396e1dd	Merge pull request #17 from stang/allow-to-change-listening-port Allow to change listening port	2018-09-14 11:20:08 +09:00
Stephane Tang	34f0578b59	Allow to change listening port It's using port 8000 by default, which is identical as the original behavior. Signed-off-by: Stephane Tang <hi@stang.sh>	2018-09-14 00:03:18 +01:00
Hidetake Iwata	604d118b68	Update README.md	2018-09-07 10:56:26 +09:00
Hidetake Iwata	91959e8a56	Update README.md	2018-09-07 10:56:21 +09:00
Hidetake Iwata	9b325a66a9	Show version on help	2018-09-05 12:54:00 +09:00
Hidetake Iwata	8b6257d60b	Introduce goreleaser	2018-09-05 12:54:00 +09:00
Hidetake Iwata	d469df4978	Fix cli.Parse does not respect argument	2018-09-05 11:34:40 +09:00
Hidetake Iwata	3ae68df848	Merge pull request #14 from int128/ux Improve error messages	2018-09-04 06:52:24 +09:00
Hidetake Iwata	e8805f7a94	Improve error messages	2018-09-04 06:49:49 +09:00
Hidetake Iwata	717da9d442	Merge pull request #15 from int128/refresh-token Fix refresh token is not set with Google IdP	2018-09-04 06:41:58 +09:00
Hidetake Iwata	de176cfbaa	Fix refresh token is not set with Google IdP	2018-09-03 14:42:00 +09:00
Hidetake Iwata	9bf8a89577	Merge pull request #13 from int128/extra-scopes Add extra-scopes support	2018-09-02 14:20:35 +09:00
Hidetake Iwata	a91c020f46	Update README.md	2018-09-02 14:19:23 +09:00
Hidetake Iwata	d4fb49613d	Add extra-scopes support	2018-08-31 21:02:34 +09:00
Hidetake Iwata	64b1d52208	Fix test says message if CLI returns error	2018-08-31 15:19:58 +09:00
Hidetake Iwata	a298058e3f	Refactor test	2018-08-31 14:59:50 +09:00
Hidetake Iwata	309e73d8c0	Merge pull request #12 from int128/browser-delay Add delay before opening browser	2018-08-31 09:30:05 +09:00
Hidetake Iwata	857d5dad88	Add delay before opening browser	2018-08-30 21:28:17 +09:00
Hidetake Iwata	455c920b65	Refactor e2e test	2018-08-30 14:47:03 +09:00
Hidetake Iwata	afad46817a	Update README.md	2018-08-28 12:28:59 +09:00
Hidetake Iwata	4f506b9f62	Update README.md	2018-08-28 09:53:16 +09:00
Hidetake Iwata	72bc19bc10	Rename	2018-08-28 09:30:11 +09:00
Hidetake Iwata	69bcb16e26	Update README.md	2018-08-27 22:27:11 +09:00
Hidetake Iwata	978a45bcf1	Refactor	2018-08-27 14:49:25 +09:00
Hidetake Iwata	62b9a2158d	Refactor	2018-08-26 12:33:35 +09:00
Hidetake Iwata	974fc5c526	Merge pull request #10 from int128/oidc-browser Open browser automatically on authentication	2018-08-26 11:07:07 +09:00
Hidetake Iwata	2c7d958efd	Close browser automatically	2018-08-25 21:53:41 +09:00
Hidetake Iwata	16b15cd21b	Open browser automatically on authentication	2018-08-25 21:53:41 +09:00
Hidetake Iwata	3213572180	Polish	2018-08-24 15:22:09 +09:00
Hidetake Iwata	b7bbcd44e1	Merge pull request #9 from int128/oidc-ca Add support of OIDC CA certificate	2018-08-24 14:05:21 +09:00
Hidetake Iwata	7726ac6c51	Add support of OIDC CA certificate	2018-08-24 14:02:42 +09:00
Hidetake Iwata	adaeba4c24	Refactor	2018-08-22 13:37:12 +09:00
Hidetake Iwata	e8acaa28b3	Refactor	2018-08-22 13:28:51 +09:00
Hidetake Iwata	031f9fb81a	Merge pull request #6 from int128/integration-test Add integration test	2018-08-22 12:52:09 +09:00
Hidetake Iwata	8a7da83338	Add integration test	2018-08-22 12:48:48 +09:00
Hidetake Iwata	b776bac764	Add insecure-skip-tls-verify option	2018-08-16 09:34:12 +09:00
Hidetake Iwata	4bf77886a8	Introduce flags	2018-08-15 19:12:59 +09:00
Hidetake Iwata	ea711f91b4	Update README.md	2018-08-14 16:33:00 +09:00
Hidetake Iwata	cfc6376f69	Refactor README.md	2018-08-14 10:56:30 +09:00