Fix build error of windows_amd64 binary (#97)

* Introduce spf13/cobra

* Add login transparently feature

.circleci/config.yml

@@ -2,37 +2,38 @@ 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
-      - run: make -C integration-test/testdata
-      - run: go test -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: bash <(curl -s https://codecov.io/bash)
+      - 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: /.*/

.editorconfig

@@ -1,15 +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
-
-[Makefile]
-indent_style = tab
-indent_size = 4

.gitignore

@@ -1,2 +1,9 @@
+/.idea
+
+/.kubeconfig*
+
+/dist
+/coverage.out
+
 /kubelogin
-/.kubeconfig
+/kubectl-oidc_login

Makefile

@@ -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
+	$(MAKE) -C adaptors_test/keys/testdata
+	go test -v -race -cover -coverprofile=coverage.out ./...
+
+$(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/

README.md

@@ -1,234 +1,271 @@
-# kubelogin [![CircleCI](https://circleci.com/gh/int128/kubelogin.svg?style=shield)](https://circleci.com/gh/int128/kubelogin)
+# kubelogin [![CircleCI](https://circleci.com/gh/int128/kubelogin.svg?style=shield)](https://circleci.com/gh/int128/kubelogin) [![Go Report Card](https://goreportcard.com/badge/github.com/int128/kubelogin)](https://goreportcard.com/report/github.com/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), also known as `kubectl oidc-login`.
+It gets a token from the OIDC provider and writes it to the kubeconfig.
 
 
-## TL;DR
+## Getting Started
 
-1. Setup your OpenID Connect provider, e.g. Google Identity Platform or Keycloak.
-1. Setup your Kubernetes cluster.
-1. Setup your `kubectl`.
-
-```
-% kubelogin --help
-2018/08/15 19:08:58 Usage:
-  kubelogin [OPTIONS]
-
-Application Options:
-      --kubeconfig=               Path to the kubeconfig file (default: ~/.kube/config) [$KUBECONFIG]
-      --insecure-skip-tls-verify  If set, the server's certificate will not be checked for validity. This will make your HTTPS connections insecure
-                                  [$KUBELOGIN_INSECURE_SKIP_TLS_VERIFY]
-
-Help Options:
-  -h, --help        Show this help message
-```
-
-
-## Getting Started with Google Account
-
-### 1. Setup Google API
-
-Open [Google APIs Console](https://console.developers.google.com/apis/credentials) and create an OAuth client as follows:
-
-- Application Type: Web application
-- Redirect URL: `http://localhost:8000/`
-
-### 2. Setup Kubernetes cluster
-
-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 append the following settings:
-
-```yaml
-spec:
-  kubeAPIServer:
-    oidcIssuerURL: https://accounts.google.com
-    oidcClientID: YOUR_CLIENT_ID.apps.googleusercontent.com
-```
-
-Here assign the `cluster-admin` role to your user.
-
-```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
-```
-
-### 3. Setup kubectl and kubelogin
-
-Setup `kubectl` to authenticate with your identity provider.
+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://accounts.google.com \
-  --auth-provider-arg client-id=YOUR_CLIENT_ID.apps.googleusercontent.com \
-  --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
 ```
 
-Download [the latest release](https://github.com/int128/kubelogin/releases) and save it.
+You need to setup the following components:
 
-Run `kubelogin` and open http://localhost:8000 in your browser.
+- OIDC provider
+- Kubernetes API server
+- kubectl authentication
+- Role binding
+
+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)
+
+
+### Login manually
+
+Just run:
+
+```sh
+kubelogin
+
+# or run as a kubectl plugin
+kubectl oidc-login
+```
+
+It automatically opens the browser and you can log in to the provider.
+
+<img src="docs/keycloak-login.png" alt="keycloak-login" width="455" height="329">
+
+After authentication, it writes an ID token and refresh token to the kubeconfig.
 
 ```
 % 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
+Open http://localhost:8000 for authentication
+You got a valid token until 2019-05-18 10:28:51 +0900 JST
+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.
+Now you can access to the 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
+% kubectl get pods
+NAME                          READY   STATUS    RESTARTS   AGE
+echoserver-86c78fdccd-nzmd5   1/1     Running   0          26d
+```
+
+If the token is valid, kubelogin does nothing.
+
+```
+% kubelogin
+You already have a valid token until 2019-05-18 10:28:51 +0900 JST
 ```
 
 
-## Getting Started with Keycloak
+### Login transparently
 
-### 1. Setup Keycloak
-
-Create an OIDC client as follows:
-
-- Redirect URL: `http://localhost:8000/`
-- Issuer URL: `https://keycloak.example.com/auth/realms/YOUR_REALM`
-- Client ID: `kubernetes`
-- Groups claim: `groups`
-
-Then create a group `kubernetes:admin` and join to it.
-
-### 2. Setup Kubernetes cluster
-
-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 append the following settings:
-
-```yaml
-spec:
-  kubeAPIServer:
-    oidcIssuerURL: https://keycloak.example.com/auth/realms/YOUR_REALM
-    oidcClientID: kubernetes
-    oidcGroupsClaim: groups
-```
-
-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
-```
-
-### 3. Setup kubectl and kubelogin
-
-Setup `kubectl` to authenticate with your identity provider.
+You can wrap kubectl to transparently login to the provider.
 
 ```sh
-kubectl config set-credentials CLUSTER_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
+alias kubectl='kubelogin exec -- kubectl'
+
+# or run as a kubectl plugin
+alias kubectl='kubectl oidc-login exec -- kubectl'
 ```
 
-Download [the latest release](https://github.com/int128/kubelogin/releases) and save it.
+If the token expired, it updates the kubeconfig and executes kubectl.
 
-Run `kubelogin` and make sure you can access to the cluster.
-See the previous section for details.
+```
+% kubectl get pods
+Open http://localhost:8000 for authentication
+You got a valid token until 2019-06-05 19:05:34 +0900 JST
+NAME                          READY   STATUS    RESTARTS   AGE
+echoserver-86c78fdccd-nzmd5   1/1     Running   0          26d
+```
+
+If the token is valid, it just executes kubectl.
+
+```
+% kubectl get pods
+NAME                          READY   STATUS    RESTARTS   AGE
+echoserver-86c78fdccd-nzmd5   1/1     Running   0          26d
+```
+
+It respects kubectl options passed to the extra arguments.
+For example, if you run `kubectl --kubeconfig .kubeconfig`,
+it will update `.kubeconfig` and execute kubectl.
+
+If the current auth provider is not `oidc`, it just executes kubectl.
 
 
 ## Configuration
 
+This document is for the development version.
+If you are looking for a specific version, see [the release tags](https://github.com/int128/kubelogin/tags).
+
+Kubelogin supports the following options:
+
+```
+Usage:
+  kubelogin [flags]
+  kubelogin [command]
+
+Examples:
+  # Login to the provider using authorization code grant.
+  kubelogin
+
+  # Login to the provider using resource owner password credentials grant.
+  kubelogin --username USERNAME --password PASSWORD
+
+  # Wrap kubectl and login transparently
+  alias kubectl='kubelogin exec -- kubectl'
+
+Available Commands:
+  exec        Login transparently and execute the kubectl command
+  help        Help about any command
+  version     Print the version information
+
+Flags:
+      --kubeconfig string              Path to the kubeconfig file
+      --context string                 The name of the kubeconfig context to use
+      --user string                    The name of the kubeconfig user to use. Prior to --context
+      --certificate-authority string   Path to a cert file for the certificate authority
+      --insecure-skip-tls-verify       If true, the server's certificate will not be checked for validity. This will make your HTTPS connections insecure
+  -v, --v int                          If set to 1 or greater, it shows debug log
+      --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
+      --username string                If set, perform the resource owner password credentials grant
+      --password string                If set, use the password instead of asking it
+  -h, --help                           help for kubelogin
+```
+
+It supports the following keys of `auth-provider` in a kubeconfig.
+See [kubectl authentication](https://kubernetes.io/docs/reference/access-authn-authz/authentication/#using-kubectl) for more.
+
+Key | Direction | Value
+----|-----------|------
+`idp-issuer-url`                  | Read (Mandatory) | Issuer URL of the provider.
+`client-id`                       | Read (Mandatory) | Client ID of the provider.
+`client-secret`                   | Read (Mandatory) | Client Secret of the provider.
+`idp-certificate-authority`       | Read | CA certificate path of the provider.
+`idp-certificate-authority-data`  | Read | Base64 encoded CA certificate of the provider.
+`extra-scopes`                    | Read | Scopes to request to the provider (comma separated).
+`id-token`                        | Write | ID token got from the provider.
+`refresh-token`                   | Write | Refresh token got from the provider.
+
+
 ### Kubeconfig
 
-You can set the environment variable `KUBECONFIG` to point the config file.
-Default to `~/.kube/config`.
+You can set path to the kubeconfig file by the option or the environment variable just like kubectl.
+It defaults to `~/.kube/config`.
 
 ```sh
-export KUBECONFIG="$PWD/.kubeconfig"
+# by the option
+kubelogin --kubeconfig /path/to/kubeconfig
+
+# by the environment variable
+KUBECONFIG="/path/to/kubeconfig1:/path/to/kubeconfig2" kubelogin
 ```
 
-### OpenID Connect Provider CA Certificate
+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.
 
-You can specify the CA certificate of your OpenID Connect provider by [`idp-certificate-authority` or `idp-certificate-authority-data` in the kubeconfig](https://kubernetes.io/docs/reference/access-authn-authz/authentication/#using-kubectl).
+
+### Authentication flows
+
+#### Authorization code flow
+
+Kubelogin performs the authorization code flow by default.
+
+It starts the local server at port 8000 or 18000 by default.
+You need to register the following redirect URIs to the 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
-kubectl config set-credentials CLUSTER_NAME \
-  --auth-provider-arg idp-certificate-authority=$PWD/ca.crt
+kubelogin --listen-port 12345 --listen-port 23456
 ```
 
-### Setup script
 
-In actual team operation, you can share the following script to your team members for easy setup.
+#### Resource owner password credentials grant flow
+
+You can use the resource owner password credentials grant flow.
+Note that not all providers support this flow as:
+
+> The resource owner password credentials grant type is suitable in
+> cases where the resource owner has a trust relationship with the
+> client, such as the device operating system or a highly privileged
+> application.
+> The authorization server should take special care when
+> enabling this grant type and only allow it when other flows are not
+> viable.
+>
+> <https://tools.ietf.org/html/rfc6749#section-4.3>
+
+You can pass the username and password:
+
+```
+% kubelogin --username USER --password PASS
+```
+
+or ask the password:
+
+```
+% kubelogin --username USER
+Password:
+```
+
+
+### Extra scopes
+
+You can set extra scopes to request to the provider by `extra-scopes` in the kubeconfig.
 
 ```sh
-#!/bin/sh -xe
-CLUSTER_NAME="hello.k8s.local"
-
-export KUBECONFIG="$PWD/.kubeconfig"
-
-kubectl config set-cluster "$CLUSTER_NAME" \
-  --server https://api-xxx.xxx.elb.amazonaws.com \
-  --certificate-authority "$PWD/cluster.crt"
-
-kubectl config set-credentials "$CLUSTER_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
-
-kubectl config set-context "$CLUSTER_NAME" --cluster "$CLUSTER_NAME" --user "$CLUSTER_NAME"
-kubectl config use-context "$CLUSTER_NAME"
+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/ $KUBECONFIG
+```
+
+
+### CA Certificates
+
+You can set your self-signed certificates for the OIDC provider (not Kubernetes API server) by kubeconfig or option.
+
+```sh
+kubectl config set-credentials keycloak \
+  --auth-provider-arg idp-certificate-authority=$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.

adaptors/adaptors.go

@@ -0,0 +1,79 @@
+package adaptors
+
+import (
+	"context"
+
+	"github.com/coreos/go-oidc"
+	"github.com/int128/kubelogin/models/kubeconfig"
+)
+
+//go:generate mockgen -destination mock_adaptors/mock_adaptors.go github.com/int128/kubelogin/adaptors Kubeconfig,OIDC,OIDCClient,Env,Logger
+
+type Cmd interface {
+	Run(ctx context.Context, args []string, version string) int
+}
+
+type Kubeconfig interface {
+	GetCurrentAuth(explicitFilename string, contextName kubeconfig.ContextName, userName kubeconfig.UserName) (*kubeconfig.Auth, error)
+	UpdateAuth(auth *kubeconfig.Auth) error
+}
+
+type OIDC interface {
+	New(config OIDCClientConfig) (OIDCClient, error)
+}
+
+type OIDCClientConfig struct {
+	Config         kubeconfig.OIDCConfig
+	CACertFilename string
+	SkipTLSVerify  bool
+}
+
+type OIDCClient interface {
+	AuthenticateByCode(ctx context.Context, in OIDCAuthenticateByCodeIn) (*OIDCAuthenticateOut, error)
+	AuthenticateByPassword(ctx context.Context, in OIDCAuthenticateByPasswordIn) (*OIDCAuthenticateOut, error)
+	Verify(ctx context.Context, in OIDCVerifyIn) (*oidc.IDToken, error)
+}
+
+type OIDCAuthenticateByCodeIn struct {
+	Config             kubeconfig.OIDCConfig
+	LocalServerPort    []int // HTTP server port candidates
+	SkipOpenBrowser    bool  // skip opening browser if true
+	ShowLocalServerURL interface{ ShowLocalServerURL(url string) }
+}
+
+type OIDCAuthenticateByPasswordIn struct {
+	Config   kubeconfig.OIDCConfig
+	Username string
+	Password string
+}
+
+type OIDCAuthenticateOut struct {
+	VerifiedIDToken *oidc.IDToken
+	IDToken         string
+	RefreshToken    string
+}
+
+type OIDCVerifyIn struct {
+	Config kubeconfig.OIDCConfig
+}
+
+type Env interface {
+	ReadPassword(prompt string) (string, error)
+	Exec(ctx context.Context, executable string, args []string) (int, error)
+}
+
+type Logger interface {
+	Printf(format string, v ...interface{})
+	Debugf(level LogLevel, format string, v ...interface{})
+	SetLevel(level LogLevel)
+	IsEnabled(level LogLevel) bool
+}
+
+// LogLevel represents a log level for debug.
+//
+// 0 = None
+// 1 = Including in/out
+// 2 = Including transport headers
+// 3 = Including transport body
+//
+type LogLevel int

adaptors/cmd/cmd.go

@@ -0,0 +1,168 @@
+package cmd
+
+import (
+	"context"
+	"fmt"
+	"path/filepath"
+
+	"github.com/int128/kubelogin/adaptors"
+	"github.com/int128/kubelogin/models/kubeconfig"
+	"github.com/int128/kubelogin/usecases"
+	"github.com/pkg/errors"
+	"github.com/spf13/cobra"
+	"github.com/spf13/pflag"
+)
+
+const examples = `  # Login to the provider using authorization code grant.
+  %[1]s
+
+  # Login to the provider using resource owner password credentials grant.
+  %[1]s --username USERNAME --password PASSWORD
+
+  # Wrap kubectl and login transparently
+  alias kubectl='%[1]s exec -- kubectl'`
+
+var defaultListenPort = []int{8000, 18000}
+
+type Cmd struct {
+	Login        usecases.Login
+	LoginAndExec usecases.LoginAndExec
+	Logger       adaptors.Logger
+}
+
+func (cmd *Cmd) Run(ctx context.Context, args []string, version string) int {
+	var exitCode int
+	executable := filepath.Base(args[0])
+	var o struct {
+		kubectlOptions
+		kubeloginOptions
+	}
+	rootCmd := cobra.Command{
+		Use:     executable,
+		Short:   "Login to the OpenID Connect provider and update the kubeconfig",
+		Example: fmt.Sprintf(examples, executable),
+		Args:    cobra.NoArgs,
+		Run: func(*cobra.Command, []string) {
+			cmd.Logger.SetLevel(adaptors.LogLevel(o.Verbose))
+			in := usecases.LoginIn{
+				KubeconfigFilename: o.Kubeconfig,
+				KubeconfigContext:  kubeconfig.ContextName(o.Context),
+				KubeconfigUser:     kubeconfig.UserName(o.User),
+				CACertFilename:     o.CertificateAuthority,
+				SkipTLSVerify:      o.SkipTLSVerify,
+				ListenPort:         o.ListenPort,
+				SkipOpenBrowser:    o.SkipOpenBrowser,
+				Username:           o.Username,
+				Password:           o.Password,
+			}
+			if err := cmd.Login.Do(ctx, in); err != nil {
+				cmd.Logger.Printf("error: %s", err)
+				exitCode = 1
+				return
+			}
+		},
+	}
+	o.kubectlOptions.register(rootCmd.Flags())
+	o.kubeloginOptions.register(rootCmd.Flags())
+
+	execCmd := cobra.Command{
+		Use:   "exec [flags] -- kubectl [args]",
+		Short: "Login transparently and execute the kubectl command",
+		Args: func(execCmd *cobra.Command, args []string) error {
+			if execCmd.ArgsLenAtDash() == -1 {
+				return errors.Errorf("double dash is missing, please run as %s exec -- kubectl", executable)
+			}
+			if len(args) < 1 {
+				return errors.New("too few arguments")
+			}
+			return nil
+		},
+		Run: func(execCmd *cobra.Command, args []string) {
+			// parse the extra args and override the kubectl options
+			f := pflag.NewFlagSet(execCmd.Name(), pflag.ContinueOnError)
+			o.kubectlOptions.register(f)
+			// ignore unknown flags and help flags (-h/--help)
+			f.ParseErrorsWhitelist.UnknownFlags = true
+			f.BoolP("help", "h", false, "ignore help flags")
+			if err := f.Parse(args); err != nil {
+				cmd.Logger.Debugf(1, "error while parsing the extra arguments: %s", err)
+			}
+			cmd.Logger.SetLevel(adaptors.LogLevel(o.Verbose))
+			in := usecases.LoginAndExecIn{
+				LoginIn: usecases.LoginIn{
+					KubeconfigFilename: o.Kubeconfig,
+					KubeconfigContext:  kubeconfig.ContextName(o.Context),
+					KubeconfigUser:     kubeconfig.UserName(o.User),
+					CACertFilename:     o.CertificateAuthority,
+					SkipTLSVerify:      o.SkipTLSVerify,
+					ListenPort:         o.ListenPort,
+					SkipOpenBrowser:    o.SkipOpenBrowser,
+					Username:           o.Username,
+					Password:           o.Password,
+				},
+				Executable: args[0],
+				Args:       args[1:],
+			}
+			out, err := cmd.LoginAndExec.Do(ctx, in)
+			if err != nil {
+				cmd.Logger.Printf("error: %s", err)
+				exitCode = 1
+				return
+			}
+			exitCode = out.ExitCode
+		},
+	}
+	o.kubeloginOptions.register(execCmd.Flags())
+	rootCmd.AddCommand(&execCmd)
+
+	versionCmd := cobra.Command{
+		Use:   "version",
+		Short: "Print the version information",
+		Args:  cobra.NoArgs,
+		Run: func(*cobra.Command, []string) {
+			cmd.Logger.Printf("%s version %s", executable, version)
+		},
+	}
+	rootCmd.AddCommand(&versionCmd)
+
+	rootCmd.SetArgs(args[1:])
+	if err := rootCmd.Execute(); err != nil {
+		cmd.Logger.Debugf(1, "error while parsing the arguments: %s", err)
+		return 1
+	}
+	return exitCode
+}
+
+type kubectlOptions struct {
+	Kubeconfig           string
+	Context              string
+	User                 string
+	CertificateAuthority string
+	SkipTLSVerify        bool
+	Verbose              int
+}
+
+func (o *kubectlOptions) register(f *pflag.FlagSet) {
+	f.SortFlags = false
+	f.StringVar(&o.Kubeconfig, "kubeconfig", "", "Path to the kubeconfig file")
+	f.StringVar(&o.Context, "context", "", "The name of the kubeconfig context to use")
+	f.StringVar(&o.User, "user", "", "The name of the kubeconfig user to use. Prior to --context")
+	f.StringVar(&o.CertificateAuthority, "certificate-authority", "", "Path to a cert file for the certificate authority")
+	f.BoolVar(&o.SkipTLSVerify, "insecure-skip-tls-verify", false, "If true, the server's certificate will not be checked for validity. This will make your HTTPS connections insecure")
+	f.IntVarP(&o.Verbose, "v", "v", 0, "If set to 1 or greater, it shows debug log")
+}
+
+type kubeloginOptions struct {
+	ListenPort      []int
+	SkipOpenBrowser bool
+	Username        string
+	Password        string
+}
+
+func (o *kubeloginOptions) register(f *pflag.FlagSet) {
+	f.SortFlags = false
+	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.Username, "username", "", "If set, perform the resource owner password credentials grant")
+	f.StringVar(&o.Password, "password", "", "If set, use the password instead of asking it")
+}

adaptors/cmd/cmd_test.go

@@ -0,0 +1,268 @@
+package cmd
+
+import (
+	"context"
+	"testing"
+
+	"github.com/golang/mock/gomock"
+	"github.com/int128/kubelogin/adaptors"
+	"github.com/int128/kubelogin/adaptors/mock_adaptors"
+	"github.com/int128/kubelogin/usecases"
+	"github.com/int128/kubelogin/usecases/mock_usecases"
+)
+
+func TestCmd_Run(t *testing.T) {
+	const executable = "kubelogin"
+	const version = "HEAD"
+
+	t.Run("login/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("login/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",
+				KubeconfigContext:  "hello.k8s.local",
+				KubeconfigUser:     "google",
+				CACertFilename:     "/path/to/cacert",
+				SkipTLSVerify:      true,
+				ListenPort:         []int{10080, 20080},
+				SkipOpenBrowser:    true,
+				Username:           "USER",
+				Password:           "PASS",
+			})
+
+		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",
+			"--certificate-authority", "/path/to/cacert",
+			"--insecure-skip-tls-verify",
+			"-v1",
+			"--listen-port", "10080",
+			"--listen-port", "20080",
+			"--skip-open-browser",
+			"--username", "USER",
+			"--password", "PASS",
+		}, version)
+		if exitCode != 0 {
+			t.Errorf("exitCode wants 0 but %d", exitCode)
+		}
+	})
+
+	t.Run("login/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)
+		}
+	})
+
+	t.Run("loginAndExec/Defaults", func(t *testing.T) {
+		ctrl := gomock.NewController(t)
+		defer ctrl.Finish()
+		ctx := context.TODO()
+
+		loginAndExec := mock_usecases.NewMockLoginAndExec(ctrl)
+		loginAndExec.EXPECT().
+			Do(ctx, usecases.LoginAndExecIn{
+				LoginIn: usecases.LoginIn{
+					ListenPort: defaultListenPort,
+				},
+				Executable: "kubectl",
+				Args:       []string{"dummy"},
+			}).
+			Return(&usecases.LoginAndExecOut{ExitCode: 0}, nil)
+
+		logger := mock_adaptors.NewLogger(t, ctrl)
+		logger.EXPECT().SetLevel(adaptors.LogLevel(0))
+
+		cmd := Cmd{
+			LoginAndExec: loginAndExec,
+			Logger:       logger,
+		}
+		exitCode := cmd.Run(ctx, []string{executable, "exec", "--", "kubectl", "dummy"}, version)
+		if exitCode != 0 {
+			t.Errorf("exitCode wants 0 but %d", exitCode)
+		}
+	})
+
+	t.Run("loginAndExec/OptionsInExtraArgs", func(t *testing.T) {
+		ctrl := gomock.NewController(t)
+		defer ctrl.Finish()
+		ctx := context.TODO()
+
+		loginAndExec := mock_usecases.NewMockLoginAndExec(ctrl)
+		loginAndExec.EXPECT().
+			Do(ctx, usecases.LoginAndExecIn{
+				LoginIn: usecases.LoginIn{
+					KubeconfigFilename: "/path/to/kubeconfig2",
+					KubeconfigContext:  "hello2.k8s.local",
+					KubeconfigUser:     "google2",
+					CACertFilename:     "/path/to/cacert2",
+					SkipTLSVerify:      true,
+					ListenPort:         defaultListenPort,
+				},
+				Executable: "kubectl",
+				Args: []string{
+					"--kubeconfig", "/path/to/kubeconfig2",
+					"--context", "hello2.k8s.local",
+					"--user", "google2",
+					"--certificate-authority", "/path/to/cacert2",
+					"--insecure-skip-tls-verify",
+					"-v2",
+					"--listen-port", "30080",
+					"--skip-open-browser",
+					"--username", "USER2",
+					"--password", "PASS2",
+					"dummy",
+					"--dummy",
+					"--help",
+				},
+			}).
+			Return(&usecases.LoginAndExecOut{ExitCode: 0}, nil)
+
+		logger := mock_adaptors.NewLogger(t, ctrl)
+		logger.EXPECT().SetLevel(adaptors.LogLevel(2))
+
+		cmd := Cmd{
+			LoginAndExec: loginAndExec,
+			Logger:       logger,
+		}
+		exitCode := cmd.Run(ctx, []string{executable,
+			"exec",
+			"--",
+			"kubectl",
+			// kubectl options in the extra args should be mapped to the options
+			"--kubeconfig", "/path/to/kubeconfig2",
+			"--context", "hello2.k8s.local",
+			"--user", "google2",
+			"--certificate-authority", "/path/to/cacert2",
+			"--insecure-skip-tls-verify",
+			"-v2",
+			// kubelogin options in the extra args should not affect
+			"--listen-port", "30080",
+			"--skip-open-browser",
+			"--username", "USER2",
+			"--password", "PASS2",
+			"dummy",
+			"--dummy",
+			"--help",
+		}, version)
+		if exitCode != 0 {
+			t.Errorf("exitCode wants 0 but %d", exitCode)
+		}
+	})
+
+	t.Run("loginAndExec/OverrideOptions", func(t *testing.T) {
+		ctrl := gomock.NewController(t)
+		defer ctrl.Finish()
+		ctx := context.TODO()
+
+		loginAndExec := mock_usecases.NewMockLoginAndExec(ctrl)
+		loginAndExec.EXPECT().
+			Do(ctx, usecases.LoginAndExecIn{
+				LoginIn: usecases.LoginIn{
+					KubeconfigFilename: "/path/to/kubeconfig2",
+					KubeconfigContext:  "hello2.k8s.local",
+					KubeconfigUser:     "google2",
+					CACertFilename:     "/path/to/cacert2",
+					SkipTLSVerify:      true,
+					ListenPort:         []int{10080, 20080},
+					SkipOpenBrowser:    true,
+					Username:           "USER",
+					Password:           "PASS",
+				},
+				Executable: "kubectl",
+				Args: []string{
+					"--kubeconfig", "/path/to/kubeconfig2",
+					"--context", "hello2.k8s.local",
+					"--user", "google2",
+					"--certificate-authority", "/path/to/cacert2",
+					"--insecure-skip-tls-verify",
+					"-v2",
+					"--listen-port", "30080",
+					"--skip-open-browser",
+					"--username", "USER2",
+					"--password", "PASS2",
+					"dummy",
+					"--dummy",
+				},
+			}).
+			Return(&usecases.LoginAndExecOut{ExitCode: 0}, nil)
+
+		logger := mock_adaptors.NewLogger(t, ctrl)
+		logger.EXPECT().SetLevel(adaptors.LogLevel(2))
+
+		cmd := Cmd{
+			LoginAndExec: loginAndExec,
+			Logger:       logger,
+		}
+		exitCode := cmd.Run(ctx, []string{executable,
+			// kubelogin options in the first args should be mapped to the options
+			"--listen-port", "10080",
+			"--listen-port", "20080",
+			"--skip-open-browser",
+			"--username", "USER",
+			"--password", "PASS",
+			"exec",
+			"--",
+			"kubectl",
+			// kubectl options in the extra args should be mapped to the options
+			"--kubeconfig", "/path/to/kubeconfig2",
+			"--context", "hello2.k8s.local",
+			"--user", "google2",
+			"--certificate-authority", "/path/to/cacert2",
+			"--insecure-skip-tls-verify",
+			"-v2",
+			// kubelogin options in the extra args should not affect
+			"--listen-port", "30080",
+			"--skip-open-browser",
+			"--username", "USER2",
+			"--password", "PASS2",
+			"dummy",
+			"--dummy",
+		}, version)
+		if exitCode != 0 {
+			t.Errorf("exitCode wants 0 but %d", exitCode)
+		}
+	})
+}

adaptors/env/env.go

@@ -0,0 +1,44 @@
+package env
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"os/exec"
+	"syscall"
+
+	"github.com/pkg/errors"
+	"golang.org/x/crypto/ssh/terminal"
+)
+
+// Env provides environment specific facilities.
+type Env struct{}
+
+// ReadPassword reads a password from the stdin without echo back.
+func (*Env) ReadPassword(prompt string) (string, error) {
+	if _, err := fmt.Fprint(os.Stderr, "Password: "); err != nil {
+		return "", errors.Wrapf(err, "could not write the prompt")
+	}
+	b, err := terminal.ReadPassword(int(syscall.Stdin))
+	if err != nil {
+		return "", errors.Wrapf(err, "could not read")
+	}
+	if _, err := fmt.Fprintln(os.Stderr); err != nil {
+		return "", errors.Wrapf(err, "could not write a new line")
+	}
+	return string(b), nil
+}
+
+func (*Env) Exec(ctx context.Context, executable string, args []string) (int, error) {
+	c := exec.CommandContext(ctx, executable, args...)
+	c.Stdin = os.Stdin
+	c.Stdout = os.Stdout
+	c.Stderr = os.Stderr
+	if err := c.Run(); err != nil {
+		if err, ok := err.(*exec.ExitError); ok {
+			return err.ExitCode(), nil
+		}
+		return 0, errors.Wrapf(err, "could not execute the command")
+	}
+	return 0, nil
+}

adaptors/kubeconfig/kubeconfig.go

@@ -0,0 +1,3 @@
+package kubeconfig
+
+type Kubeconfig struct{}

adaptors/kubeconfig/load.go

@@ -0,0 +1,85 @@
+package kubeconfig
+
+import (
+	"strings"
+
+	"github.com/int128/kubelogin/models/kubeconfig"
+	"github.com/pkg/errors"
+	"k8s.io/client-go/tools/clientcmd"
+	"k8s.io/client-go/tools/clientcmd/api"
+)
+
+func (*Kubeconfig) GetCurrentAuth(explicitFilename string, contextName kubeconfig.ContextName, userName kubeconfig.UserName) (*kubeconfig.Auth, error) {
+	config, err := loadByDefaultRules(explicitFilename)
+	if err != nil {
+		return nil, errors.WithStack(err)
+	}
+	auth, err := findCurrentAuth(config, contextName, userName)
+	if err != nil {
+		return nil, errors.Wrapf(err, "could not find the current auth provider")
+	}
+	return auth, nil
+}
+
+func loadByDefaultRules(explicitFilename string) (*api.Config, error) {
+	rules := clientcmd.NewDefaultClientConfigLoadingRules()
+	rules.ExplicitPath = explicitFilename
+	config, err := rules.Load()
+	if err != nil {
+		return nil, errors.Wrapf(err, "could not load the kubeconfig")
+	}
+	return config, err
+}
+
+// findCurrentAuth resolves the current auth provider.
+// If contextName is given, this returns the user of the context.
+// If userName is given, this ignores the context and returns the user.
+// If any context or user is not found, this returns an error.
+func findCurrentAuth(config *api.Config, contextName kubeconfig.ContextName, userName kubeconfig.UserName) (*kubeconfig.Auth, error) {
+	if userName == "" {
+		if contextName == "" {
+			contextName = kubeconfig.ContextName(config.CurrentContext)
+		}
+		contextNode, ok := config.Contexts[string(contextName)]
+		if !ok {
+			return nil, errors.Errorf("context %s does not exist", contextName)
+		}
+		userName = kubeconfig.UserName(contextNode.AuthInfo)
+	}
+	userNode, ok := config.AuthInfos[string(userName)]
+	if !ok {
+		return nil, errors.Errorf("user %s does not exist", userName)
+	}
+	if userNode.AuthProvider == nil {
+		return nil, errors.Errorf("auth-provider is missing")
+	}
+	if userNode.AuthProvider.Name != "oidc" {
+		return nil, errors.Errorf("auth-provider.name must be oidc but is %s", userNode.AuthProvider.Name)
+	}
+	if userNode.AuthProvider.Config == nil {
+		return nil, errors.Errorf("auth-provider.config is missing")
+	}
+	return &kubeconfig.Auth{
+		LocationOfOrigin: userNode.LocationOfOrigin,
+		UserName:         userName,
+		ContextName:      contextName,
+		OIDCConfig:       makeOIDCConfig(userNode.AuthProvider.Config),
+	}, nil
+}
+
+func makeOIDCConfig(m map[string]string) kubeconfig.OIDCConfig {
+	var extraScopes []string
+	if m["extra-scopes"] != "" {
+		extraScopes = strings.Split(m["extra-scopes"], ",")
+	}
+	return kubeconfig.OIDCConfig{
+		IDPIssuerURL:                m["idp-issuer-url"],
+		ClientID:                    m["client-id"],
+		ClientSecret:                m["client-secret"],
+		IDPCertificateAuthority:     m["idp-certificate-authority"],
+		IDPCertificateAuthorityData: m["idp-certificate-authority-data"],
+		ExtraScopes:                 extraScopes,
+		IDToken:                     m["id-token"],
+		RefreshToken:                m["refresh-token"],
+	}
+}

adaptors/kubeconfig/load_test.go

@@ -0,0 +1,225 @@
+package kubeconfig
+
+import (
+	"os"
+	"testing"
+
+	"github.com/go-test/deep"
+	"github.com/int128/kubelogin/models/kubeconfig"
+	"k8s.io/client-go/tools/clientcmd/api"
+)
+
+func Test_loadByDefaultRules(t *testing.T) {
+	t.Run("google.yaml>keycloak.yaml", func(t *testing.T) {
+		setenv(t, "KUBECONFIG", "testdata/kubeconfig.google.yaml"+string(os.PathListSeparator)+"testdata/kubeconfig.keycloak.yaml")
+		defer unsetenv(t, "KUBECONFIG")
+
+		config, err := loadByDefaultRules("")
+		if err != nil {
+			t.Fatalf("Could not load the configs: %s", err)
+		}
+		if w := "google@hello.k8s.local"; w != config.CurrentContext {
+			t.Errorf("CurrentContext wants %s but %s", w, config.CurrentContext)
+		}
+		if _, ok := config.Contexts["google@hello.k8s.local"]; !ok {
+			t.Errorf("Contexts[google@hello.k8s.local] is missing")
+		}
+		if _, ok := config.Contexts["keycloak@hello.k8s.local"]; !ok {
+			t.Errorf("Contexts[keycloak@hello.k8s.local] is missing")
+		}
+		if _, ok := config.AuthInfos["google"]; !ok {
+			t.Errorf("AuthInfos[google] is missing")
+		}
+		if _, ok := config.AuthInfos["keycloak"]; !ok {
+			t.Errorf("AuthInfos[keycloak] is missing")
+		}
+	})
+
+	t.Run("keycloak.yaml>google.yaml", func(t *testing.T) {
+		setenv(t, "KUBECONFIG", "testdata/kubeconfig.keycloak.yaml"+string(os.PathListSeparator)+"testdata/kubeconfig.google.yaml")
+		defer unsetenv(t, "KUBECONFIG")
+
+		config, err := loadByDefaultRules("")
+		if err != nil {
+			t.Fatalf("Could not load the configs: %s", err)
+		}
+		if w := "keycloak@hello.k8s.local"; w != config.CurrentContext {
+			t.Errorf("CurrentContext wants %s but %s", w, config.CurrentContext)
+		}
+		if _, ok := config.Contexts["google@hello.k8s.local"]; !ok {
+			t.Errorf("Contexts[google@hello.k8s.local] is missing")
+		}
+		if _, ok := config.Contexts["keycloak@hello.k8s.local"]; !ok {
+			t.Errorf("Contexts[keycloak@hello.k8s.local] is missing")
+		}
+		if _, ok := config.AuthInfos["google"]; !ok {
+			t.Errorf("AuthInfos[google] is missing")
+		}
+		if _, ok := config.AuthInfos["keycloak"]; !ok {
+			t.Errorf("AuthInfos[keycloak] is missing")
+		}
+	})
+}
+
+func setenv(t *testing.T, key, value string) {
+	t.Helper()
+	if err := os.Setenv(key, value); err != nil {
+		t.Fatalf("Could not set the env var %s=%s: %s", key, value, err)
+	}
+}
+
+func unsetenv(t *testing.T, key string) {
+	t.Helper()
+	if err := os.Unsetenv(key); err != nil {
+		t.Fatalf("Could not unset the env var %s: %s", key, err)
+	}
+}
+
+func Test_findCurrentAuth(t *testing.T) {
+	t.Run("CurrentContext", func(t *testing.T) {
+		auth, err := findCurrentAuth(&api.Config{
+			CurrentContext: "theContext",
+			Contexts: map[string]*api.Context{
+				"theContext": {
+					AuthInfo: "theUser",
+				},
+			},
+			AuthInfos: map[string]*api.AuthInfo{
+				"theUser": {
+					LocationOfOrigin: "/path/to/kubeconfig",
+					AuthProvider: &api.AuthProviderConfig{
+						Name: "oidc",
+						Config: map[string]string{
+							"idp-issuer-url":                 "https://accounts.google.com",
+							"client-id":                      "GOOGLE_CLIENT_ID",
+							"client-secret":                  "GOOGLE_CLIENT_SECRET",
+							"idp-certificate-authority":      "/path/to/cert",
+							"idp-certificate-authority-data": "BASE64",
+							"extra-scopes":                   "email,profile",
+							"id-token":                       "YOUR_ID_TOKEN",
+							"refresh-token":                  "YOUR_REFRESH_TOKEN",
+						},
+					},
+				},
+			},
+		}, "", "")
+		if err != nil {
+			t.Fatalf("Could not find the current auth: %s", err)
+		}
+		want := &kubeconfig.Auth{
+			LocationOfOrigin: "/path/to/kubeconfig",
+			UserName:         "theUser",
+			ContextName:      "theContext",
+			OIDCConfig: kubeconfig.OIDCConfig{
+				IDPIssuerURL:                "https://accounts.google.com",
+				ClientID:                    "GOOGLE_CLIENT_ID",
+				ClientSecret:                "GOOGLE_CLIENT_SECRET",
+				IDPCertificateAuthority:     "/path/to/cert",
+				IDPCertificateAuthorityData: "BASE64",
+				ExtraScopes:                 []string{"email", "profile"},
+				IDToken:                     "YOUR_ID_TOKEN",
+				RefreshToken:                "YOUR_REFRESH_TOKEN",
+			},
+		}
+		if diff := deep.Equal(want, auth); diff != nil {
+			t.Error(diff)
+		}
+	})
+
+	t.Run("ByContextName", func(t *testing.T) {
+		auth, err := findCurrentAuth(&api.Config{
+			Contexts: map[string]*api.Context{
+				"theContext": {
+					AuthInfo: "theUser",
+				},
+			},
+			AuthInfos: map[string]*api.AuthInfo{
+				"theUser": {
+					LocationOfOrigin: "/path/to/kubeconfig",
+					AuthProvider: &api.AuthProviderConfig{
+						Name: "oidc",
+						Config: map[string]string{
+							"idp-issuer-url": "https://accounts.google.com",
+						},
+					},
+				},
+			},
+		}, "theContext", "")
+		if err != nil {
+			t.Fatalf("Could not find the current auth: %s", err)
+		}
+		want := &kubeconfig.Auth{
+			LocationOfOrigin: "/path/to/kubeconfig",
+			UserName:         "theUser",
+			ContextName:      "theContext",
+			OIDCConfig: kubeconfig.OIDCConfig{
+				IDPIssuerURL: "https://accounts.google.com",
+			},
+		}
+		if diff := deep.Equal(want, auth); diff != nil {
+			t.Error(diff)
+		}
+	})
+
+	t.Run("ByUserName", func(t *testing.T) {
+		auth, err := findCurrentAuth(&api.Config{
+			AuthInfos: map[string]*api.AuthInfo{
+				"theUser": {
+					LocationOfOrigin: "/path/to/kubeconfig",
+					AuthProvider: &api.AuthProviderConfig{
+						Name: "oidc",
+						Config: map[string]string{
+							"idp-issuer-url": "https://accounts.google.com",
+						},
+					},
+				},
+			},
+		}, "", "theUser")
+		if err != nil {
+			t.Fatalf("Could not find the current auth: %s", err)
+		}
+		want := &kubeconfig.Auth{
+			LocationOfOrigin: "/path/to/kubeconfig",
+			UserName:         "theUser",
+			OIDCConfig: kubeconfig.OIDCConfig{
+				IDPIssuerURL: "https://accounts.google.com",
+			},
+		}
+		if diff := deep.Equal(want, auth); diff != nil {
+			t.Error(diff)
+		}
+	})
+
+	t.Run("NoConfig", func(t *testing.T) {
+		_, err := findCurrentAuth(&api.Config{
+			AuthInfos: map[string]*api.AuthInfo{
+				"theUser": {
+					LocationOfOrigin: "/path/to/kubeconfig",
+					AuthProvider: &api.AuthProviderConfig{
+						Name: "oidc",
+					},
+				},
+			},
+		}, "", "theUser")
+		if err == nil {
+			t.Fatalf("wants error but nil")
+		}
+	})
+
+	t.Run("NotOIDC", func(t *testing.T) {
+		_, err := findCurrentAuth(&api.Config{
+			AuthInfos: map[string]*api.AuthInfo{
+				"theUser": {
+					LocationOfOrigin: "/path/to/kubeconfig",
+					AuthProvider: &api.AuthProviderConfig{
+						Name:   "some",
+						Config: map[string]string{"foo": "bar"},
+					},
+				},
+			},
+		}, "", "theUser")
+		if err == nil {
+			t.Fatalf("wants error but nil")
+		}
+	})
+}

adaptors/kubeconfig/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

adaptors/kubeconfig/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

adaptors/kubeconfig/write.go

@@ -0,0 +1,51 @@
+package kubeconfig
+
+import (
+	"strings"
+
+	"github.com/int128/kubelogin/models/kubeconfig"
+	"github.com/pkg/errors"
+	"k8s.io/client-go/tools/clientcmd"
+)
+
+func (*Kubeconfig) UpdateAuth(auth *kubeconfig.Auth) error {
+	config, err := clientcmd.LoadFromFile(auth.LocationOfOrigin)
+	if err != nil {
+		return errors.Wrapf(err, "could not load %s", auth.LocationOfOrigin)
+	}
+	userNode, ok := config.AuthInfos[string(auth.UserName)]
+	if !ok {
+		return errors.Errorf("user %s does not exist", auth.UserName)
+	}
+	if userNode.AuthProvider == nil {
+		return errors.Errorf("auth-provider is missing")
+	}
+	if userNode.AuthProvider.Name != "oidc" {
+		return errors.Errorf("auth-provider must be oidc but is %s", userNode.AuthProvider.Name)
+	}
+	copyOIDCConfig(auth.OIDCConfig, userNode.AuthProvider.Config)
+	if err := clientcmd.WriteToFile(*config, auth.LocationOfOrigin); err != nil {
+		return errors.Wrapf(err, "could not update %s", auth.LocationOfOrigin)
+	}
+	return nil
+}
+
+func copyOIDCConfig(config kubeconfig.OIDCConfig, m map[string]string) {
+	setOrDeleteKey(m, "idp-issuer-url", config.IDPIssuerURL)
+	setOrDeleteKey(m, "client-id", config.ClientID)
+	setOrDeleteKey(m, "client-secret", config.ClientSecret)
+	setOrDeleteKey(m, "idp-certificate-authority", config.IDPCertificateAuthority)
+	setOrDeleteKey(m, "idp-certificate-authority-data", config.IDPCertificateAuthorityData)
+	extraScopes := strings.Join(config.ExtraScopes, ",")
+	setOrDeleteKey(m, "extra-scopes", extraScopes)
+	setOrDeleteKey(m, "id-token", config.IDToken)
+	setOrDeleteKey(m, "refresh-token", config.RefreshToken)
+}
+
+func setOrDeleteKey(m map[string]string, key, value string) {
+	if value == "" {
+		delete(m, key)
+		return
+	}
+	m[key] = value
+}

adaptors/kubeconfig/write_test.go

@@ -0,0 +1,138 @@
+package kubeconfig
+
+import (
+	"io/ioutil"
+	"os"
+	"testing"
+
+	"github.com/int128/kubelogin/models/kubeconfig"
+)
+
+func TestKubeconfig_UpdateAuth(t *testing.T) {
+	var k Kubeconfig
+
+	t.Run("MinimumKeys", func(t *testing.T) {
+		f := newKubeconfigFile(t)
+		defer func() {
+			if err := os.Remove(f.Name()); err != nil {
+				t.Errorf("Could not remove the temp file: %s", err)
+			}
+		}()
+		if err := k.UpdateAuth(&kubeconfig.Auth{
+			LocationOfOrigin: f.Name(),
+			UserName:         "google",
+			OIDCConfig: kubeconfig.OIDCConfig{
+				IDPIssuerURL: "https://accounts.google.com",
+				ClientID:     "GOOGLE_CLIENT_ID",
+				ClientSecret: "GOOGLE_CLIENT_SECRET",
+				IDToken:      "YOUR_ID_TOKEN",
+				RefreshToken: "YOUR_REFRESH_TOKEN",
+			},
+		}); err != nil {
+			t.Fatalf("Could not update auth: %s", err)
+		}
+		b, err := ioutil.ReadFile(f.Name())
+		if err != nil {
+			t.Fatalf("Could not read kubeconfig: %s", err)
+		}
+
+		want := `apiVersion: v1
+clusters: []
+contexts: []
+current-context: ""
+kind: Config
+preferences: {}
+users:
+- name: google
+  user:
+    auth-provider:
+      config:
+        client-id: GOOGLE_CLIENT_ID
+        client-secret: GOOGLE_CLIENT_SECRET
+        id-token: YOUR_ID_TOKEN
+        idp-issuer-url: https://accounts.google.com
+        refresh-token: YOUR_REFRESH_TOKEN
+      name: oidc
+`
+		if want != string(b) {
+			t.Errorf("---- kubeconfig wants ----\n%s\n---- but ----\n%s", want, string(b))
+		}
+	})
+
+	t.Run("FullKeys", func(t *testing.T) {
+		f := newKubeconfigFile(t)
+		defer func() {
+			if err := os.Remove(f.Name()); err != nil {
+				t.Errorf("Could not remove the temp file: %s", err)
+			}
+		}()
+		if err := k.UpdateAuth(&kubeconfig.Auth{
+			LocationOfOrigin: f.Name(),
+			UserName:         "google",
+			OIDCConfig: kubeconfig.OIDCConfig{
+				IDPIssuerURL:                "https://accounts.google.com",
+				ClientID:                    "GOOGLE_CLIENT_ID",
+				ClientSecret:                "GOOGLE_CLIENT_SECRET",
+				IDPCertificateAuthority:     "/path/to/cert",
+				IDPCertificateAuthorityData: "BASE64",
+				ExtraScopes:                 []string{"email", "profile"},
+				IDToken:                     "YOUR_ID_TOKEN",
+				RefreshToken:                "YOUR_REFRESH_TOKEN",
+			},
+		}); err != nil {
+			t.Fatalf("Could not update auth: %s", err)
+		}
+		b, err := ioutil.ReadFile(f.Name())
+		if err != nil {
+			t.Fatalf("Could not read kubeconfig: %s", err)
+		}
+
+		want := `apiVersion: v1
+clusters: []
+contexts: []
+current-context: ""
+kind: Config
+preferences: {}
+users:
+- name: google
+  user:
+    auth-provider:
+      config:
+        client-id: GOOGLE_CLIENT_ID
+        client-secret: GOOGLE_CLIENT_SECRET
+        extra-scopes: email,profile
+        id-token: YOUR_ID_TOKEN
+        idp-certificate-authority: /path/to/cert
+        idp-certificate-authority-data: BASE64
+        idp-issuer-url: https://accounts.google.com
+        refresh-token: YOUR_REFRESH_TOKEN
+      name: oidc
+`
+		if want != string(b) {
+			t.Errorf("---- kubeconfig wants ----\n%s\n---- but ----\n%s", want, string(b))
+		}
+	})
+}
+
+func newKubeconfigFile(t *testing.T) *os.File {
+	content := `apiVersion: v1
+clusters: []
+kind: Config
+preferences: {}
+users:
+  - name: google
+    user:
+      auth-provider:
+        config:
+          idp-issuer-url: https://accounts.google.com
+        name: oidc`
+	f, err := ioutil.TempFile("", "kubeconfig")
+	if err != nil {
+		t.Fatalf("Could not create a file: %s", err)
+	}
+	defer f.Close()
+	if _, err := f.Write([]byte(content)); err != nil {
+		t.Fatalf("Could not write kubeconfig: %s", err)
+	}
+	return f
+}

adaptors/logger/logger.go

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

adaptors/logger/logger_test.go

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

adaptors/mock_adaptors/logger.go

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

adaptors/mock_adaptors/mock_adaptors.go

@@ -0,0 +1,284 @@
+// Code generated by MockGen. DO NOT EDIT.
+// Source: github.com/int128/kubelogin/adaptors (interfaces: Kubeconfig,OIDC,OIDCClient,Env,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"
+	adaptors "github.com/int128/kubelogin/adaptors"
+	kubeconfig "github.com/int128/kubelogin/models/kubeconfig"
+	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
+}
+
+// GetCurrentAuth mocks base method
+func (m *MockKubeconfig) GetCurrentAuth(arg0 string, arg1 kubeconfig.ContextName, arg2 kubeconfig.UserName) (*kubeconfig.Auth, error) {
+	ret := m.ctrl.Call(m, "GetCurrentAuth", arg0, arg1, arg2)
+	ret0, _ := ret[0].(*kubeconfig.Auth)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// GetCurrentAuth indicates an expected call of GetCurrentAuth
+func (mr *MockKubeconfigMockRecorder) GetCurrentAuth(arg0, arg1, arg2 interface{}) *gomock.Call {
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "GetCurrentAuth", reflect.TypeOf((*MockKubeconfig)(nil).GetCurrentAuth), arg0, arg1, arg2)
+}
+
+// UpdateAuth mocks base method
+func (m *MockKubeconfig) UpdateAuth(arg0 *kubeconfig.Auth) error {
+	ret := m.ctrl.Call(m, "UpdateAuth", arg0)
+	ret0, _ := ret[0].(error)
+	return ret0
+}
+
+// UpdateAuth indicates an expected call of UpdateAuth
+func (mr *MockKubeconfigMockRecorder) UpdateAuth(arg0 interface{}) *gomock.Call {
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "UpdateAuth", reflect.TypeOf((*MockKubeconfig)(nil).UpdateAuth), 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
+}
+
+// New mocks base method
+func (m *MockOIDC) New(arg0 adaptors.OIDCClientConfig) (adaptors.OIDCClient, error) {
+	ret := m.ctrl.Call(m, "New", arg0)
+	ret0, _ := ret[0].(adaptors.OIDCClient)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// New indicates an expected call of New
+func (mr *MockOIDCMockRecorder) New(arg0 interface{}) *gomock.Call {
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "New", reflect.TypeOf((*MockOIDC)(nil).New), arg0)
+}
+
+// MockOIDCClient is a mock of OIDCClient interface
+type MockOIDCClient struct {
+	ctrl     *gomock.Controller
+	recorder *MockOIDCClientMockRecorder
+}
+
+// MockOIDCClientMockRecorder is the mock recorder for MockOIDCClient
+type MockOIDCClientMockRecorder struct {
+	mock *MockOIDCClient
+}
+
+// NewMockOIDCClient creates a new mock instance
+func NewMockOIDCClient(ctrl *gomock.Controller) *MockOIDCClient {
+	mock := &MockOIDCClient{ctrl: ctrl}
+	mock.recorder = &MockOIDCClientMockRecorder{mock}
+	return mock
+}
+
+// EXPECT returns an object that allows the caller to indicate expected use
+func (m *MockOIDCClient) EXPECT() *MockOIDCClientMockRecorder {
+	return m.recorder
+}
+
+// AuthenticateByCode mocks base method
+func (m *MockOIDCClient) AuthenticateByCode(arg0 context.Context, arg1 adaptors.OIDCAuthenticateByCodeIn) (*adaptors.OIDCAuthenticateOut, error) {
+	ret := m.ctrl.Call(m, "AuthenticateByCode", arg0, arg1)
+	ret0, _ := ret[0].(*adaptors.OIDCAuthenticateOut)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// AuthenticateByCode indicates an expected call of AuthenticateByCode
+func (mr *MockOIDCClientMockRecorder) AuthenticateByCode(arg0, arg1 interface{}) *gomock.Call {
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "AuthenticateByCode", reflect.TypeOf((*MockOIDCClient)(nil).AuthenticateByCode), arg0, arg1)
+}
+
+// AuthenticateByPassword mocks base method
+func (m *MockOIDCClient) AuthenticateByPassword(arg0 context.Context, arg1 adaptors.OIDCAuthenticateByPasswordIn) (*adaptors.OIDCAuthenticateOut, error) {
+	ret := m.ctrl.Call(m, "AuthenticateByPassword", arg0, arg1)
+	ret0, _ := ret[0].(*adaptors.OIDCAuthenticateOut)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// AuthenticateByPassword indicates an expected call of AuthenticateByPassword
+func (mr *MockOIDCClientMockRecorder) AuthenticateByPassword(arg0, arg1 interface{}) *gomock.Call {
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "AuthenticateByPassword", reflect.TypeOf((*MockOIDCClient)(nil).AuthenticateByPassword), arg0, arg1)
+}
+
+// Verify mocks base method
+func (m *MockOIDCClient) Verify(arg0 context.Context, arg1 adaptors.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 *MockOIDCClientMockRecorder) Verify(arg0, arg1 interface{}) *gomock.Call {
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Verify", reflect.TypeOf((*MockOIDCClient)(nil).Verify), arg0, arg1)
+}
+
+// MockEnv is a mock of Env interface
+type MockEnv struct {
+	ctrl     *gomock.Controller
+	recorder *MockEnvMockRecorder
+}
+
+// MockEnvMockRecorder is the mock recorder for MockEnv
+type MockEnvMockRecorder struct {
+	mock *MockEnv
+}
+
+// NewMockEnv creates a new mock instance
+func NewMockEnv(ctrl *gomock.Controller) *MockEnv {
+	mock := &MockEnv{ctrl: ctrl}
+	mock.recorder = &MockEnvMockRecorder{mock}
+	return mock
+}
+
+// EXPECT returns an object that allows the caller to indicate expected use
+func (m *MockEnv) EXPECT() *MockEnvMockRecorder {
+	return m.recorder
+}
+
+// Exec mocks base method
+func (m *MockEnv) Exec(arg0 context.Context, arg1 string, arg2 []string) (int, error) {
+	ret := m.ctrl.Call(m, "Exec", arg0, arg1, arg2)
+	ret0, _ := ret[0].(int)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// Exec indicates an expected call of Exec
+func (mr *MockEnvMockRecorder) Exec(arg0, arg1, arg2 interface{}) *gomock.Call {
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Exec", reflect.TypeOf((*MockEnv)(nil).Exec), arg0, arg1, arg2)
+}
+
+// ReadPassword mocks base method
+func (m *MockEnv) ReadPassword(arg0 string) (string, error) {
+	ret := m.ctrl.Call(m, "ReadPassword", arg0)
+	ret0, _ := ret[0].(string)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// ReadPassword indicates an expected call of ReadPassword
+func (mr *MockEnvMockRecorder) ReadPassword(arg0 interface{}) *gomock.Call {
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "ReadPassword", reflect.TypeOf((*MockEnv)(nil).ReadPassword), arg0)
+}
+
+// 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 adaptors.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 adaptors.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 adaptors.LogLevel) {
+	m.ctrl.Call(m, "SetLevel", arg0)
+}
+
+// SetLevel indicates an expected call of SetLevel
+func (mr *MockLoggerMockRecorder) SetLevel(arg0 interface{}) *gomock.Call {
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "SetLevel", reflect.TypeOf((*MockLogger)(nil).SetLevel), arg0)
+}

adaptors/oidc/http.go

@@ -0,0 +1,75 @@
+package oidc
+
+import (
+	"crypto/tls"
+	"crypto/x509"
+	"encoding/base64"
+	"io/ioutil"
+	"net/http"
+
+	"github.com/int128/kubelogin/adaptors"
+	"github.com/int128/kubelogin/adaptors/oidc/logging"
+	"github.com/pkg/errors"
+)
+
+func newHTTPClient(config adaptors.OIDCClientConfig, logger adaptors.Logger) (*http.Client, error) {
+	pool := x509.NewCertPool()
+	if config.Config.IDPCertificateAuthority != "" {
+		logger.Debugf(1, "Loading the certificate %s", config.Config.IDPCertificateAuthority)
+		err := appendCertificateFromFile(pool, config.Config.IDPCertificateAuthority)
+		if err != nil {
+			return nil, errors.Wrapf(err, "could not load the certificate of idp-certificate-authority")
+		}
+	}
+	if config.Config.IDPCertificateAuthorityData != "" {
+		logger.Debugf(1, "Loading the certificate of idp-certificate-authority-data")
+		err := appendEncodedCertificate(pool, config.Config.IDPCertificateAuthorityData)
+		if err != nil {
+			return nil, errors.Wrapf(err, "could not load the certificate of idp-certificate-authority-data")
+		}
+	}
+	if config.CACertFilename != "" {
+		logger.Debugf(1, "Loading the certificate %s", config.CACertFilename)
+		err := appendCertificateFromFile(pool, config.CACertFilename)
+		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: &logging.Transport{
+			Base: &http.Transport{
+				TLSClientConfig: &tlsConfig,
+				Proxy:           http.ProxyFromEnvironment,
+			},
+			Logger: logger,
+		},
+	}, nil
+}
+
+func appendCertificateFromFile(pool *x509.CertPool, filename string) error {
+	b, err := ioutil.ReadFile(filename)
+	if err != nil {
+		return errors.Wrapf(err, "could not read %s", filename)
+	}
+	if !pool.AppendCertsFromPEM(b) {
+		return errors.Errorf("could not append certificate from %s", filename)
+	}
+	return nil
+}
+
+func appendEncodedCertificate(pool *x509.CertPool, base64String string) error {
+	b, err := base64.StdEncoding.DecodeString(base64String)
+	if err != nil {
+		return errors.Wrapf(err, "could not decode base64")
+	}
+	if !pool.AppendCertsFromPEM(b) {
+		return errors.Errorf("could not append certificate")
+	}
+	return nil
+}

adaptors/oidc/logging/transport.go

@@ -0,0 +1,50 @@
+package logging
+
+import (
+	"net/http"
+	"net/http/httputil"
+
+	"github.com/int128/kubelogin/adaptors"
+)
+
+const (
+	logLevelDumpHeaders = 2
+	logLevelDumpBody    = 3
+)
+
+type Transport struct {
+	Base   http.RoundTripper
+	Logger adaptors.Logger
+}
+
+func (t *Transport) 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 *Transport) IsDumpEnabled() bool {
+	return t.Logger.IsEnabled(logLevelDumpHeaders)
+}
+
+func (t *Transport) IsDumpBodyEnabled() bool {
+	return t.Logger.IsEnabled(logLevelDumpBody)
+}

adaptors/oidc/logging/transport_test.go

@@ -0,0 +1,90 @@
+package logging
+
+import (
+	"bufio"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+
+	"github.com/golang/mock/gomock"
+	"github.com/int128/kubelogin/adaptors"
+	"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 := &Transport{
+		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 := &Transport{
+		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 := &Transport{
+		Logger: logger,
+	}
+	if transport.IsDumpBodyEnabled() != true {
+		t.Errorf("IsDumpBodyEnabled wants true")
+	}
+}

adaptors/oidc/oidc.go

@@ -0,0 +1,118 @@
+package oidc
+
+import (
+	"context"
+	"net/http"
+
+	"github.com/coreos/go-oidc"
+	"github.com/int128/kubelogin/adaptors"
+	"github.com/int128/oauth2cli"
+	"github.com/pkg/errors"
+	"golang.org/x/oauth2"
+)
+
+type Factory struct {
+	Logger adaptors.Logger
+}
+
+func (f *Factory) New(config adaptors.OIDCClientConfig) (adaptors.OIDCClient, error) {
+	hc, err := newHTTPClient(config, f.Logger)
+	if err != nil {
+		return nil, errors.Wrapf(err, "could not create a HTTP client")
+	}
+	return &Client{hc}, nil
+}
+
+type Client struct {
+	hc *http.Client
+}
+
+func (c *Client) AuthenticateByCode(ctx context.Context, in adaptors.OIDCAuthenticateByCodeIn) (*adaptors.OIDCAuthenticateOut, error) {
+	if c.hc != nil {
+		ctx = context.WithValue(ctx, oauth2.HTTPClient, c.hc)
+	}
+	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: in.ShowLocalServerURL.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 (c *Client) AuthenticateByPassword(ctx context.Context, in adaptors.OIDCAuthenticateByPasswordIn) (*adaptors.OIDCAuthenticateOut, error) {
+	if c.hc != nil {
+		ctx = context.WithValue(ctx, oauth2.HTTPClient, c.hc)
+	}
+	provider, err := oidc.NewProvider(ctx, in.Config.IDPIssuerURL)
+	if err != nil {
+		return nil, errors.Wrapf(err, "could not discovery the OIDC issuer")
+	}
+	config := oauth2.Config{
+		Endpoint:     provider.Endpoint(),
+		ClientID:     in.Config.ClientID,
+		ClientSecret: in.Config.ClientSecret,
+		Scopes:       append(in.Config.ExtraScopes, oidc.ScopeOpenID),
+	}
+	token, err := config.PasswordCredentialsToken(ctx, in.Username, in.Password)
+	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 (c *Client) Verify(ctx context.Context, in adaptors.OIDCVerifyIn) (*oidc.IDToken, error) {
+	if c.hc != nil {
+		ctx = context.WithValue(ctx, oauth2.HTTPClient, c.hc)
+	}
+	provider, err := oidc.NewProvider(ctx, in.Config.IDPIssuerURL)
+	if err != nil {
+		return nil, errors.Wrapf(err, "could not discovery the OIDC issuer")
+	}
+	verifier := provider.Verifier(&oidc.Config{ClientID: in.Config.ClientID})
+	verifiedIDToken, err := verifier.Verify(ctx, in.Config.IDToken)
+	if err != nil {
+		return nil, errors.Wrapf(err, "could not verify the id_token")
+	}
+	return verifiedIDToken, nil
+}

adaptors_test/authserver/authserver.go

@@ -0,0 +1,77 @@
+// Package authserver provides an authentication server which supports
+// Authorization Code Grant and Resource Owner Password Credentials Grant.
+// This is only for testing.
+//
+package authserver
+
+import (
+	"context"
+	"net"
+	"net/http"
+	"testing"
+)
+
+type Shutdowner interface {
+	Shutdown(t *testing.T, ctx context.Context)
+}
+
+type shutdowner struct {
+	l net.Listener
+	s *http.Server
+}
+
+func (s *shutdowner) Shutdown(t *testing.T, ctx context.Context) {
+	// s.Shutdown() closes the lister as well,
+	// so we do not need to call l.Close() explicitly
+	if err := s.s.Shutdown(ctx); err != nil {
+		t.Errorf("Could not shutdown the server: %s", err)
+	}
+}
+
+// Start starts an authentication server.
+func Start(t *testing.T, h func(url string) http.Handler) Shutdowner {
+	t.Helper()
+	l, port := newLocalhostListener(t)
+	url := "http://localhost:" + port
+	s := &http.Server{
+		Handler: h(url),
+	}
+	go func() {
+		err := s.Serve(l)
+		if err != nil && err != http.ErrServerClosed {
+			t.Error(err)
+		}
+	}()
+	return &shutdowner{l, s}
+}
+
+// Start starts an authentication server with TLS.
+func StartTLS(t *testing.T, cert string, key string, h func(url string) http.Handler) Shutdowner {
+	t.Helper()
+	l, port := newLocalhostListener(t)
+	url := "https://localhost:" + port
+	s := &http.Server{
+		Handler: h(url),
+	}
+	go func() {
+		err := s.ServeTLS(l, cert, key)
+		if err != nil && err != http.ErrServerClosed {
+			t.Error(err)
+		}
+	}()
+	return &shutdowner{l, s}
+}
+
+func newLocalhostListener(t *testing.T) (net.Listener, string) {
+	t.Helper()
+	l, err := net.Listen("tcp", "localhost:0")
+	if err != nil {
+		t.Fatalf("Could not create a listener: %s", err)
+	}
+	addr := l.Addr().String()
+	_, port, err := net.SplitHostPort(addr)
+	if err != nil {
+		t.Fatalf("Could not parse the address %s: %s", addr, err)
+	}
+	return l, port
+}

adaptors_test/authserver/code.go

@@ -0,0 +1,107 @@
+package authserver
+
+import (
+	"crypto/rsa"
+	"encoding/base64"
+	"fmt"
+	"math/big"
+	"net/http"
+	"testing"
+
+	"github.com/pkg/errors"
+)
+
+// CodeConfig represents a config for Authorization Code Grant.
+type CodeConfig struct {
+	Issuer         string
+	Scope          string
+	IDToken        string
+	RefreshToken   string
+	IDTokenKeyPair *rsa.PrivateKey
+	Code           string
+}
+
+type codeHandler struct {
+	t         *testing.T
+	c         CodeConfig
+	templates templates
+	values    templateValues
+}
+
+func NewCodeHandler(t *testing.T, c CodeConfig) *codeHandler {
+	if c.Scope == "" {
+		c.Scope = "openid"
+	}
+	if c.Code == "" {
+		c.Code = "3d24a8bd-35e6-457d-999e-e04bb1dfcec7"
+	}
+	h := codeHandler{
+		t:         t,
+		c:         c,
+		templates: parseTemplates(t),
+		values: templateValues{
+			Issuer:       c.Issuer,
+			IDToken:      c.IDToken,
+			RefreshToken: c.RefreshToken,
+		},
+	}
+	if c.IDTokenKeyPair != nil {
+		h.values.PrivateKey.E = base64.RawURLEncoding.EncodeToString(big.NewInt(int64(c.IDTokenKeyPair.E)).Bytes())
+		h.values.PrivateKey.N = base64.RawURLEncoding.EncodeToString(c.IDTokenKeyPair.N.Bytes())
+	}
+	return &h
+}
+
+func (h *codeHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	if err := h.serveHTTP(w, r); err != nil {
+		h.t.Logf("authserver/codeHandler: Error: %s", err)
+		w.WriteHeader(500)
+	}
+}
+
+func (h *codeHandler) serveHTTP(w http.ResponseWriter, r *http.Request) error {
+	m := r.Method
+	p := r.URL.Path
+	h.t.Logf("authserver/codeHandler: %s %s", m, r.RequestURI)
+	switch {
+	case m == "GET" && p == "/.well-known/openid-configuration":
+		w.Header().Add("Content-Type", "application/json")
+		if err := h.templates.discovery.Execute(w, h.values); 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.c.Scope != q.Get("scope") {
+			return errors.Errorf("scope wants %s but %s", h.c.Scope, q.Get("scope"))
+		}
+		to := fmt.Sprintf("%s?state=%s&code=%s", q.Get("redirect_uri"), q.Get("state"), h.c.Code)
+		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")
+		}
+		grantType, code := r.Form.Get("grant_type"), r.Form.Get("code")
+		if grantType != "authorization_code" {
+			return errors.Errorf("grant_type wants authorization_code but %s", grantType)
+		}
+		if h.c.Code != code {
+			return errors.Errorf("code wants %s but %s", h.c.Code, code)
+		}
+		w.Header().Add("Content-Type", "application/json")
+		if err := h.templates.token.Execute(w, h.values); 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.templates.jwks.Execute(w, h.values); err != nil {
+			return errors.Wrapf(err, "could not execute the template")
+		}
+	default:
+		http.Error(w, "Not Found", 404)
+	}
+	return nil
+}

adaptors_test/authserver/password.go

@@ -0,0 +1,98 @@
+package authserver
+
+import (
+	"crypto/rsa"
+	"encoding/base64"
+	"math/big"
+	"net/http"
+	"testing"
+
+	"github.com/pkg/errors"
+)
+
+// PasswordConfig represents a config for Resource Owner Password Credentials Grant.
+type PasswordConfig struct {
+	Issuer         string
+	Scope          string
+	IDToken        string
+	RefreshToken   string
+	IDTokenKeyPair *rsa.PrivateKey
+	Username       string
+	Password       string
+}
+
+type passwordHandler struct {
+	t         *testing.T
+	c         PasswordConfig
+	templates templates
+	values    templateValues
+}
+
+func NewPasswordHandler(t *testing.T, c PasswordConfig) *passwordHandler {
+	if c.Scope == "" {
+		c.Scope = "openid"
+	}
+	h := passwordHandler{
+		t:         t,
+		c:         c,
+		templates: parseTemplates(t),
+		values: templateValues{
+			Issuer:       c.Issuer,
+			IDToken:      c.IDToken,
+			RefreshToken: c.RefreshToken,
+		},
+	}
+	if c.IDTokenKeyPair != nil {
+		h.values.PrivateKey.E = base64.RawURLEncoding.EncodeToString(big.NewInt(int64(c.IDTokenKeyPair.E)).Bytes())
+		h.values.PrivateKey.N = base64.RawURLEncoding.EncodeToString(c.IDTokenKeyPair.N.Bytes())
+	}
+	return &h
+}
+
+func (h *passwordHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	if err := h.serveHTTP(w, r); err != nil {
+		h.t.Logf("authserver/passwordHandler: Error: %s", err)
+		w.WriteHeader(500)
+	}
+}
+
+func (h *passwordHandler) serveHTTP(w http.ResponseWriter, r *http.Request) error {
+	m := r.Method
+	p := r.URL.Path
+	h.t.Logf("authserver/passwordHandler: %s %s", m, r.RequestURI)
+	switch {
+	case m == "GET" && p == "/.well-known/openid-configuration":
+		w.Header().Add("Content-Type", "application/json")
+		if err := h.templates.discovery.Execute(w, h.values); err != nil {
+			return errors.Wrapf(err, "could not execute the template")
+		}
+	case m == "POST" && p == "/protocol/openid-connect/token":
+		// Token Response
+		// https://tools.ietf.org/html/rfc6749#section-4.3
+		if err := r.ParseForm(); err != nil {
+			return errors.Wrapf(err, "could not parse the form")
+		}
+		grantType, username, password := r.Form.Get("grant_type"), r.Form.Get("username"), r.Form.Get("password")
+		if grantType != "password" {
+			return errors.Errorf("grant_type wants password but %s", grantType)
+		}
+		if h.c.Username != username {
+			return errors.Errorf("username wants %s but %s", h.c.Username, username)
+		}
+		if h.c.Password != password {
+			return errors.Errorf("password wants %s but %s", h.c.Password, password)
+		}
+		w.Header().Add("Content-Type", "application/json")
+		if err := h.templates.token.Execute(w, h.values); 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.templates.jwks.Execute(w, h.values); err != nil {
+			return errors.Wrapf(err, "could not execute the template")
+		}
+	default:
+		http.Error(w, "Not Found", 404)
+	}
+	return nil
+}

adaptors_test/authserver/templates.go

@@ -0,0 +1,35 @@
+package authserver
+
+import (
+	"testing"
+	"text/template"
+)
+
+func parseTemplates(t *testing.T) templates {
+	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)
+	}
+	return templates{
+		discovery: tpl.Lookup("oidc-discovery.json"),
+		token:     tpl.Lookup("oidc-token.json"),
+		jwks:      tpl.Lookup("oidc-jwks.json"),
+	}
+}
+
+type templates struct {
+	discovery *template.Template
+	token     *template.Template
+	jwks      *template.Template
+}
+
+type templateValues struct {
+	Issuer       string
+	IDToken      string
+	RefreshToken string
+	PrivateKey   struct{ N, E string }
+}

adaptors_test/authserver/testdata/oidc-token.json

@@ -1,7 +1,7 @@
 {
   "access_token": "7eaae8ab-8f69-45d9-ab7c-73560cd9444d",
   "token_type": "Bearer",
-  "refresh_token": "44df4c82-5ce7-4260-b54d-1da0d396ef2a",
+  "refresh_token": "{{ .RefreshToken }}",
   "expires_in": 3600,
   "id_token": "{{ .IDToken }}"
 }

adaptors_test/cmd_test.go

@@ -0,0 +1,343 @@
+package adaptors_test
+
+import (
+	"context"
+	"crypto/tls"
+	"net/http"
+	"os"
+	"sync"
+	"testing"
+	"time"
+
+	"github.com/dgrijalva/jwt-go"
+	"github.com/int128/kubelogin/adaptors_test/authserver"
+	"github.com/int128/kubelogin/adaptors_test/keys"
+	"github.com/int128/kubelogin/adaptors_test/kubeconfig"
+	"github.com/int128/kubelogin/adaptors_test/logger"
+	"github.com/int128/kubelogin/di"
+)
+
+// Run the integration tests.
+//
+// 1. Start the auth server.
+// 2. Run the Cmd.
+// 3. Open a request for the local server.
+// 4. Verify the kuneconfig.
+//
+func TestCmd_Run(t *testing.T) {
+	timeout := 1 * time.Second
+
+	t.Run("Defaults", func(t *testing.T) {
+		t.Parallel()
+		ctx, cancel := context.WithTimeout(context.Background(), timeout)
+		defer cancel()
+
+		var codeConfig authserver.CodeConfig
+		server := authserver.Start(t, func(url string) http.Handler {
+			codeConfig = authserver.CodeConfig{
+				Issuer:         url,
+				IDToken:        newIDToken(t, url),
+				IDTokenKeyPair: keys.JWSKeyPair,
+				RefreshToken:   "REFRESH_TOKEN",
+			}
+			return authserver.NewCodeHandler(t, codeConfig)
+		})
+		defer server.Shutdown(t, ctx)
+
+		kubeConfigFilename := kubeconfig.Create(t, &kubeconfig.Values{
+			Issuer: codeConfig.Issuer,
+		})
+		defer os.Remove(kubeConfigFilename)
+
+		req := startBrowserRequest(t, ctx, nil)
+		runCmd(t, ctx, req, "--kubeconfig", kubeConfigFilename, "--skip-open-browser", "--listen-port", "0")
+		req.wait()
+		kubeconfig.Verify(t, kubeConfigFilename, kubeconfig.AuthProviderConfig{
+			IDToken:      codeConfig.IDToken,
+			RefreshToken: "REFRESH_TOKEN",
+		})
+	})
+
+	t.Run("ResourceOwnerPasswordCredentials", func(t *testing.T) {
+		t.Parallel()
+		ctx, cancel := context.WithTimeout(context.Background(), timeout)
+		defer cancel()
+
+		var passwordConfig authserver.PasswordConfig
+		server := authserver.Start(t, func(url string) http.Handler {
+			passwordConfig = authserver.PasswordConfig{
+				Issuer:         url,
+				IDToken:        newIDToken(t, url),
+				IDTokenKeyPair: keys.JWSKeyPair,
+				RefreshToken:   "REFRESH_TOKEN",
+				Username:       "USER",
+				Password:       "PASS",
+			}
+			return authserver.NewPasswordHandler(t, passwordConfig)
+		})
+		defer server.Shutdown(t, ctx)
+
+		kubeConfigFilename := kubeconfig.Create(t, &kubeconfig.Values{
+			Issuer: passwordConfig.Issuer,
+		})
+		defer os.Remove(kubeConfigFilename)
+
+		runCmd(t, ctx, nil, "--kubeconfig", kubeConfigFilename, "--skip-open-browser", "--username", "USER", "--password", "PASS")
+		kubeconfig.Verify(t, kubeConfigFilename, kubeconfig.AuthProviderConfig{
+			IDToken:      passwordConfig.IDToken,
+			RefreshToken: "REFRESH_TOKEN",
+		})
+	})
+
+	t.Run("env:KUBECONFIG", func(t *testing.T) {
+		t.Parallel()
+		ctx, cancel := context.WithTimeout(context.Background(), timeout)
+		defer cancel()
+
+		var codeConfig authserver.CodeConfig
+		server := authserver.Start(t, func(url string) http.Handler {
+			codeConfig = authserver.CodeConfig{
+				Issuer:         url,
+				IDToken:        newIDToken(t, url),
+				IDTokenKeyPair: keys.JWSKeyPair,
+				RefreshToken:   "REFRESH_TOKEN",
+			}
+			return authserver.NewCodeHandler(t, codeConfig)
+		})
+		defer server.Shutdown(t, ctx)
+
+		kubeConfigFilename := kubeconfig.Create(t, &kubeconfig.Values{
+			Issuer: codeConfig.Issuer,
+		})
+		defer os.Remove(kubeConfigFilename)
+
+		setenv(t, "KUBECONFIG", kubeConfigFilename+string(os.PathListSeparator)+"kubeconfig/testdata/dummy.yaml")
+		defer unsetenv(t, "KUBECONFIG")
+
+		req := startBrowserRequest(t, ctx, nil)
+		runCmd(t, ctx, req, "--skip-open-browser", "--listen-port", "0")
+		req.wait()
+		kubeconfig.Verify(t, kubeConfigFilename, kubeconfig.AuthProviderConfig{
+			IDToken:      codeConfig.IDToken,
+			RefreshToken: "REFRESH_TOKEN",
+		})
+	})
+
+	t.Run("ExtraScopes", func(t *testing.T) {
+		t.Parallel()
+		ctx, cancel := context.WithTimeout(context.Background(), timeout)
+		defer cancel()
+
+		var codeConfig authserver.CodeConfig
+		server := authserver.Start(t, func(url string) http.Handler {
+			codeConfig = authserver.CodeConfig{
+				Issuer:         url,
+				IDToken:        newIDToken(t, url),
+				IDTokenKeyPair: keys.JWSKeyPair,
+				RefreshToken:   "REFRESH_TOKEN",
+				Scope:          "profile groups openid",
+			}
+			return authserver.NewCodeHandler(t, codeConfig)
+		})
+		defer server.Shutdown(t, ctx)
+
+		kubeConfigFilename := kubeconfig.Create(t, &kubeconfig.Values{
+			Issuer:      codeConfig.Issuer,
+			ExtraScopes: "profile,groups",
+		})
+		defer os.Remove(kubeConfigFilename)
+
+		req := startBrowserRequest(t, ctx, nil)
+		runCmd(t, ctx, req, "--kubeconfig", kubeConfigFilename, "--skip-open-browser", "--listen-port", "0")
+		req.wait()
+		kubeconfig.Verify(t, kubeConfigFilename, kubeconfig.AuthProviderConfig{
+			IDToken:      codeConfig.IDToken,
+			RefreshToken: "REFRESH_TOKEN",
+		})
+	})
+
+	t.Run("CACert", func(t *testing.T) {
+		t.Parallel()
+		ctx, cancel := context.WithTimeout(context.Background(), timeout)
+		defer cancel()
+
+		var codeConfig authserver.CodeConfig
+		server := authserver.StartTLS(t, keys.TLSServerCert, keys.TLSServerKey, func(url string) http.Handler {
+			codeConfig = authserver.CodeConfig{
+				Issuer:         url,
+				IDToken:        newIDToken(t, url),
+				IDTokenKeyPair: keys.JWSKeyPair,
+				RefreshToken:   "REFRESH_TOKEN",
+			}
+			return authserver.NewCodeHandler(t, codeConfig)
+		})
+		defer server.Shutdown(t, ctx)
+
+		kubeConfigFilename := kubeconfig.Create(t, &kubeconfig.Values{
+			Issuer:                  codeConfig.Issuer,
+			IDPCertificateAuthority: keys.TLSCACert,
+		})
+		defer os.Remove(kubeConfigFilename)
+
+		req := startBrowserRequest(t, ctx, keys.TLSCACertAsConfig)
+		runCmd(t, ctx, req, "--kubeconfig", kubeConfigFilename, "--skip-open-browser", "--listen-port", "0")
+		req.wait()
+		kubeconfig.Verify(t, kubeConfigFilename, kubeconfig.AuthProviderConfig{
+			IDToken:      codeConfig.IDToken,
+			RefreshToken: "REFRESH_TOKEN",
+		})
+	})
+
+	t.Run("CACertData", func(t *testing.T) {
+		t.Parallel()
+		ctx, cancel := context.WithTimeout(context.Background(), timeout)
+		defer cancel()
+
+		var codeConfig authserver.CodeConfig
+		server := authserver.StartTLS(t, keys.TLSServerCert, keys.TLSServerKey, func(url string) http.Handler {
+			codeConfig = authserver.CodeConfig{
+				Issuer:         url,
+				IDToken:        newIDToken(t, url),
+				IDTokenKeyPair: keys.JWSKeyPair,
+				RefreshToken:   "REFRESH_TOKEN",
+			}
+			return authserver.NewCodeHandler(t, codeConfig)
+		})
+		defer server.Shutdown(t, ctx)
+
+		kubeConfigFilename := kubeconfig.Create(t, &kubeconfig.Values{
+			Issuer:                      codeConfig.Issuer,
+			IDPCertificateAuthorityData: keys.TLSCACertAsBase64,
+		})
+		defer os.Remove(kubeConfigFilename)
+
+		req := startBrowserRequest(t, ctx, keys.TLSCACertAsConfig)
+		runCmd(t, ctx, req, "--kubeconfig", kubeConfigFilename, "--skip-open-browser", "--listen-port", "0")
+		req.wait()
+		kubeconfig.Verify(t, kubeConfigFilename, kubeconfig.AuthProviderConfig{
+			IDToken:      codeConfig.IDToken,
+			RefreshToken: "REFRESH_TOKEN",
+		})
+	})
+
+	t.Run("AlreadyHaveValidToken", func(t *testing.T) {
+		t.Parallel()
+		ctx, cancel := context.WithTimeout(context.Background(), timeout)
+		defer cancel()
+
+		var codeConfig authserver.CodeConfig
+		server := authserver.Start(t, func(url string) http.Handler {
+			codeConfig = authserver.CodeConfig{
+				Issuer:         url,
+				IDTokenKeyPair: keys.JWSKeyPair,
+			}
+			return authserver.NewCodeHandler(t, codeConfig)
+		})
+		defer server.Shutdown(t, ctx)
+
+		idToken := newIDToken(t, codeConfig.Issuer)
+		kubeConfigFilename := kubeconfig.Create(t, &kubeconfig.Values{
+			Issuer:  codeConfig.Issuer,
+			IDToken: idToken,
+		})
+		defer os.Remove(kubeConfigFilename)
+
+		runCmd(t, ctx, nil, "--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, br *browserRequest, args ...string) {
+	t.Helper()
+	cmd := di.NewCmdWith(logger.New(t), br)
+	exitCode := cmd.Run(ctx, append([]string{"kubelogin", "--v=1"}, args...), "HEAD")
+	if exitCode != 0 {
+		t.Errorf("exit status wants 0 but %d", exitCode)
+	}
+}
+
+type browserRequest struct {
+	t     *testing.T
+	urlCh chan<- string
+	wg    *sync.WaitGroup
+}
+
+func (r *browserRequest) ShowLocalServerURL(url string) {
+	defer close(r.urlCh)
+	r.t.Logf("Open %s for authentication", url)
+	r.urlCh <- url
+}
+
+func (r *browserRequest) wait() {
+	r.wg.Wait()
+}
+
+func startBrowserRequest(t *testing.T, ctx context.Context, tlsConfig *tls.Config) *browserRequest {
+	t.Helper()
+	urlCh := make(chan string)
+	var wg sync.WaitGroup
+	go func() {
+		defer wg.Done()
+		select {
+		case url := <-urlCh:
+			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)
+			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)
+			}
+		case err := <-ctx.Done():
+			t.Errorf("context done while waiting for URL prompt: %s", err)
+		}
+	}()
+	wg.Add(1)
+	return &browserRequest{t, urlCh, &wg}
+}
+
+func setenv(t *testing.T, key, value string) {
+	t.Helper()
+	if err := os.Setenv(key, value); err != nil {
+		t.Fatalf("Could not set the env var %s=%s: %s", key, value, err)
+	}
+}
+
+func unsetenv(t *testing.T, key string) {
+	t.Helper()
+	if err := os.Unsetenv(key); err != nil {
+		t.Fatalf("Could not unset the env var %s: %s", key, err)
+	}
+}

adaptors_test/keys/keys.go

@@ -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
+}

adaptors_test/keys/testdata/Makefile

@@ -1,40 +1,40 @@
 .PHONY: clean
 
-all: authserver.crt authserver-ca.crt
+all: server.crt ca.crt jws.key
 
 clean:
-	rm -v authserver*
+	rm -v ca.* server.*
 
-authserver-ca.key:
+ca.key:
 	openssl genrsa -out $@ 1024
 
-authserver-ca.csr: openssl.cnf authserver-ca.key
+ca.csr: openssl.cnf ca.key
 	openssl req -config openssl.cnf \
 		-new \
-		-key authserver-ca.key \
+		-key ca.key \
 		-subj "/CN=Hello CA" \
 		-out $@
 	openssl req -noout -text -in $@
 
-authserver-ca.crt: authserver-ca.csr authserver-ca.key
+ca.crt: ca.csr ca.key
 	openssl x509 -req \
-		-signkey authserver-ca.key \
-		-in authserver-ca.csr \
+		-signkey ca.key \
+		-in ca.csr \
 		-out $@
 	openssl x509 -text -in $@
 
-authserver.key:
+server.key:
 	openssl genrsa -out $@ 1024
 
-authserver.csr: openssl.cnf authserver.key
+server.csr: openssl.cnf server.key
 	openssl req -config openssl.cnf \
 		-new \
-		-key authserver.key \
+		-key server.key \
 		-subj "/CN=localhost" \
 		-out $@
 	openssl req -noout -text -in $@
 
-authserver.crt: openssl.cnf authserver.csr authserver-ca.key authserver-ca.crt
+server.crt: openssl.cnf server.csr ca.key ca.crt
 	rm -fr ./CA
 	mkdir -p ./CA
 	touch CA/index.txt
@@ -43,8 +43,11 @@ authserver.crt: openssl.cnf authserver.csr authserver-ca.key authserver-ca.crt
 	openssl ca -config openssl.cnf \
 		-extensions v3_req \
 		-batch \
-		-cert authserver-ca.crt \
-		-keyfile authserver-ca.key \
-		-in authserver.csr \
+		-cert ca.crt \
+		-keyfile ca.key \
+		-in server.csr \
 		-out $@
 	openssl x509 -text -in $@
+
+jws.key:
+	openssl genrsa -out $@ 1024

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)
+	}
+}

adaptors_test/kubeconfig/testdata/dummy.yaml

@@ -0,0 +1,4 @@
+apiVersion: v1
+current-context: dummy
+kind: Config
+preferences: {}

adaptors_test/kubeconfig/testdata/kubeconfig.yaml

@@ -19,10 +19,16 @@ users:
         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

adaptors_test/logger/logger.go

@@ -0,0 +1,21 @@
+package logger
+
+import (
+	"github.com/int128/kubelogin/adaptors/logger"
+)
+
+func New(t testingLogger) *logger.Logger {
+	return logger.FromStdLogger(&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...)
+}

auth/authcode.go

@@ -1,107 +0,0 @@
-package auth
-
-import (
-	"context"
-	"crypto/rand"
-	"encoding/binary"
-	"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 := generateState()
-	if err != nil {
-		return nil, fmt.Errorf("Could not generate state parameter: %s", 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 generateState() (string, error) {
-	var n uint64
-	if err := binary.Read(rand.Reader, binary.LittleEndian, &n); err != nil {
-		return "", err
-	}
-	return fmt.Sprintf("%x", n), nil
-}
-
-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)
-	}
-}

auth/oidc.go

@@ -1,60 +0,0 @@
-package auth
-
-import (
-	"context"
-	"fmt"
-
-	oidc "github.com/coreos/go-oidc"
-	"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 := 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
-}

cli/cli.go

@@ -1,115 +0,0 @@
-package cli
-
-import (
-	"context"
-	"crypto/tls"
-	"crypto/x509"
-	"encoding/base64"
-	"fmt"
-	"io/ioutil"
-	"log"
-	"net/http"
-
-	"github.com/int128/kubelogin/auth"
-	"github.com/int128/kubelogin/kubeconfig"
-	flags "github.com/jessevdk/go-flags"
-	homedir "github.com/mitchellh/go-homedir"
-	"golang.org/x/oauth2"
-)
-
-// Parse parses command line arguments and returns a CLI instance.
-func Parse(args []string) (*CLI, error) {
-	var cli CLI
-	parser := flags.NewParser(&cli, flags.HelpFlag)
-	args, err := parser.Parse()
-	if err != nil {
-		return nil, err
-	}
-	if len(args) > 0 {
-		return nil, fmt.Errorf("Too many argument")
-	}
-	return &cli, nil
-}
-
-// CLI represents an interface of this command.
-type CLI struct {
-	KubeConfig    string `long:"kubeconfig" default:"~/.kube/config" env:"KUBECONFIG" description:"Path to the kubeconfig file"`
-	SkipTLSVerify bool   `long:"insecure-skip-tls-verify" env:"KUBELOGIN_INSECURE_SKIP_TLS_VERIFY" description:"If set, the server's certificate will not be checked for validity. This will make your HTTPS connections insecure"`
-	// CertificateAuthority string `long:"certificate-authority" env:"KUBELOGIN_CERTIFICATE_AUTHORITY" description:"Path to a cert file for the certificate authority"`
-}
-
-// ExpandKubeConfig returns an expanded KubeConfig path.
-func (c *CLI) ExpandKubeConfig() (string, error) {
-	d, err := homedir.Expand(c.KubeConfig)
-	if err != nil {
-		return "", fmt.Errorf("Could not expand %s", c.KubeConfig)
-	}
-	return d, nil
-}
-
-// Run performs this command.
-func (c *CLI) Run(ctx context.Context) error {
-	path, err := c.ExpandKubeConfig()
-	if err != nil {
-		return err
-	}
-	log.Printf("Reading %s", path)
-	cfg, err := kubeconfig.Load(path)
-	if err != nil {
-		return fmt.Errorf("Could not load kubeconfig: %s", err)
-	}
-	log.Printf("Using current context: %s", cfg.CurrentContext)
-	authInfo := kubeconfig.FindCurrentAuthInfo(cfg)
-	if authInfo == nil {
-		return fmt.Errorf("Could not find current context: %s", cfg.CurrentContext)
-	}
-	authProvider, err := kubeconfig.ToOIDCAuthProviderConfig(authInfo)
-	if err != nil {
-		return fmt.Errorf("Could not find auth-provider: %s", err)
-	}
-	tlsConfig, err := c.tlsConfig(authProvider)
-	if err != nil {
-		return fmt.Errorf("Could not configure TLS: %s", err)
-	}
-	client := &http.Client{Transport: &http.Transport{TLSClientConfig: tlsConfig}}
-	ctx = context.WithValue(ctx, oauth2.HTTPClient, client)
-	token, err := auth.GetTokenSet(ctx, authProvider.IDPIssuerURL(), authProvider.ClientID(), authProvider.ClientSecret())
-	if err != nil {
-		return fmt.Errorf("Authentication error: %s", err)
-	}
-
-	authProvider.SetIDToken(token.IDToken)
-	authProvider.SetRefreshToken(token.RefreshToken)
-	kubeconfig.Write(cfg, path)
-	log.Printf("Updated %s", path)
-	return nil
-}
-
-func (c *CLI) tlsConfig(authProvider *kubeconfig.OIDCAuthProviderConfig) (*tls.Config, error) {
-	p := x509.NewCertPool()
-	if authProvider.IDPCertificateAuthority() != "" {
-		b, err := ioutil.ReadFile(authProvider.IDPCertificateAuthority())
-		if err != nil {
-			return nil, fmt.Errorf("Could not read idp-certificate-authority: %s", err)
-		}
-		if p.AppendCertsFromPEM(b) != true {
-			return nil, fmt.Errorf("Could not load CA certificate from idp-certificate-authority: %s", err)
-		}
-		log.Printf("Using CA certificate: %s", authProvider.IDPCertificateAuthority())
-	}
-	if authProvider.IDPCertificateAuthorityData() != "" {
-		b, err := base64.StdEncoding.DecodeString(authProvider.IDPCertificateAuthorityData())
-		if err != nil {
-			return nil, fmt.Errorf("Could not decode idp-certificate-authority-data: %s", err)
-		}
-		if p.AppendCertsFromPEM(b) != true {
-			return nil, fmt.Errorf("Could not load CA certificate from idp-certificate-authority-data: %s", err)
-		}
-		log.Printf("Using CA certificate of idp-certificate-authority-data")
-	}
-	cfg := &tls.Config{InsecureSkipVerify: c.SkipTLSVerify}
-	if len(p.Subjects()) > 0 {
-		cfg.RootCAs = p
-	}
-	return cfg, nil
-}

di/di.go

@@ -0,0 +1,57 @@
+//+build wireinject
+
+// Package di provides dependency injection.
+package di
+
+import (
+	"github.com/google/wire"
+	"github.com/int128/kubelogin/adaptors"
+	"github.com/int128/kubelogin/adaptors/cmd"
+	"github.com/int128/kubelogin/adaptors/env"
+	"github.com/int128/kubelogin/adaptors/kubeconfig"
+	"github.com/int128/kubelogin/adaptors/logger"
+	"github.com/int128/kubelogin/adaptors/oidc"
+	"github.com/int128/kubelogin/usecases"
+	"github.com/int128/kubelogin/usecases/login"
+)
+
+var usecasesSet = wire.NewSet(
+	login.Login{},
+	login.Exec{},
+	wire.Bind((*usecases.Login)(nil), (*login.Login)(nil)),
+	wire.Bind((*usecases.LoginAndExec)(nil), (*login.Exec)(nil)),
+)
+
+var adaptorsSet = wire.NewSet(
+	cmd.Cmd{},
+	kubeconfig.Kubeconfig{},
+	oidc.Factory{},
+	env.Env{},
+	wire.Bind((*adaptors.Cmd)(nil), (*cmd.Cmd)(nil)),
+	wire.Bind((*adaptors.Kubeconfig)(nil), (*kubeconfig.Kubeconfig)(nil)),
+	wire.Bind((*adaptors.OIDC)(nil), (*oidc.Factory)(nil)),
+	wire.Bind((*adaptors.Env)(nil), (*env.Env)(nil)),
+)
+
+var extraSet = wire.NewSet(
+	login.ShowLocalServerURL{},
+	wire.Bind((*usecases.LoginShowLocalServerURL)(nil), (*login.ShowLocalServerURL)(nil)),
+	logger.New,
+)
+
+func NewCmd() adaptors.Cmd {
+	wire.Build(
+		usecasesSet,
+		adaptorsSet,
+		extraSet,
+	)
+	return nil
+}
+
+func NewCmdWith(adaptors.Logger, usecases.LoginShowLocalServerURL) adaptors.Cmd {
+	wire.Build(
+		usecasesSet,
+		adaptorsSet,
+	)
+	return nil
+}

di/wire_gen.go

@@ -0,0 +1,88 @@
+// Code generated by Wire. DO NOT EDIT.
+
+//go:generate wire
+//+build !wireinject
+
+package di
+
+import (
+	"github.com/google/wire"
+	"github.com/int128/kubelogin/adaptors"
+	"github.com/int128/kubelogin/adaptors/cmd"
+	"github.com/int128/kubelogin/adaptors/env"
+	"github.com/int128/kubelogin/adaptors/kubeconfig"
+	"github.com/int128/kubelogin/adaptors/logger"
+	"github.com/int128/kubelogin/adaptors/oidc"
+	"github.com/int128/kubelogin/usecases"
+	"github.com/int128/kubelogin/usecases/login"
+)
+
+// Injectors from di.go:
+
+func NewCmd() adaptors.Cmd {
+	kubeconfigKubeconfig := &kubeconfig.Kubeconfig{}
+	adaptorsLogger := logger.New()
+	factory := &oidc.Factory{
+		Logger: adaptorsLogger,
+	}
+	envEnv := &env.Env{}
+	showLocalServerURL := &login.ShowLocalServerURL{
+		Logger: adaptorsLogger,
+	}
+	loginLogin := &login.Login{
+		Kubeconfig:         kubeconfigKubeconfig,
+		OIDC:               factory,
+		Env:                envEnv,
+		Logger:             adaptorsLogger,
+		ShowLocalServerURL: showLocalServerURL,
+	}
+	exec := &login.Exec{
+		Kubeconfig:         kubeconfigKubeconfig,
+		OIDC:               factory,
+		Env:                envEnv,
+		Logger:             adaptorsLogger,
+		ShowLocalServerURL: showLocalServerURL,
+	}
+	cmdCmd := &cmd.Cmd{
+		Login:        loginLogin,
+		LoginAndExec: exec,
+		Logger:       adaptorsLogger,
+	}
+	return cmdCmd
+}
+
+func NewCmdWith(adaptorsLogger adaptors.Logger, loginShowLocalServerURL usecases.LoginShowLocalServerURL) adaptors.Cmd {
+	kubeconfigKubeconfig := &kubeconfig.Kubeconfig{}
+	factory := &oidc.Factory{
+		Logger: adaptorsLogger,
+	}
+	envEnv := &env.Env{}
+	loginLogin := &login.Login{
+		Kubeconfig:         kubeconfigKubeconfig,
+		OIDC:               factory,
+		Env:                envEnv,
+		Logger:             adaptorsLogger,
+		ShowLocalServerURL: loginShowLocalServerURL,
+	}
+	exec := &login.Exec{
+		Kubeconfig:         kubeconfigKubeconfig,
+		OIDC:               factory,
+		Env:                envEnv,
+		Logger:             adaptorsLogger,
+		ShowLocalServerURL: loginShowLocalServerURL,
+	}
+	cmdCmd := &cmd.Cmd{
+		Login:        loginLogin,
+		LoginAndExec: exec,
+		Logger:       adaptorsLogger,
+	}
+	return cmdCmd
+}
+
+// di.go:
+
+var usecasesSet = wire.NewSet(login.Login{}, login.Exec{}, wire.Bind((*usecases.Login)(nil), (*login.Login)(nil)), wire.Bind((*usecases.LoginAndExec)(nil), (*login.Exec)(nil)))
+
+var adaptorsSet = wire.NewSet(cmd.Cmd{}, kubeconfig.Kubeconfig{}, oidc.Factory{}, env.Env{}, wire.Bind((*adaptors.Cmd)(nil), (*cmd.Cmd)(nil)), wire.Bind((*adaptors.Kubeconfig)(nil), (*kubeconfig.Kubeconfig)(nil)), wire.Bind((*adaptors.OIDC)(nil), (*oidc.Factory)(nil)), wire.Bind((*adaptors.Env)(nil), (*env.Env)(nil)))
+
+var extraSet = wire.NewSet(login.ShowLocalServerURL{}, wire.Bind((*usecases.LoginShowLocalServerURL)(nil), (*login.ShowLocalServerURL)(nil)), logger.New)

docs/google.md

@@ -0,0 +1,95 @@
+# 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).
+
+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 KUBECONTEXT \
+  --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
+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` should be like:
+
+```yaml
+users:
+- name: hello.k8s.local
+  user:
+    auth-provider:
+      config:
+        idp-issuer-url: https://accounts.google.com
+        client-id: YOUR_CLIENT_ID.apps.googleusercontent.com
+        client-secret: YOUR_SECRET
+        id-token: ey...       # kubelogin will update ID token here
+        refresh-token: ey...  # kubelogin will update refresh token here
+      name: oidc
+```
+
+Make sure you can access to the Kubernetes cluster.
+
+```
+% kubectl get nodes
+NAME                                    STATUS    ROLES     AGE       VERSION
+ip-1-2-3-4.us-west-2.compute.internal   Ready     node      21d       v1.9.6
+ip-1-2-3-5.us-west-2.compute.internal   Ready     node      20d       v1.9.6
+```

docs/keycloak.md

@@ -0,0 +1,111 @@
+# 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 KUBECONTEXT \
+  --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
+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` should be like:
+
+```yaml
+users:
+- name: hello.k8s.local
+  user:
+    auth-provider:
+      config:
+        idp-issuer-url: https://keycloak.example.com/auth/realms/YOUR_REALM
+        client-id: kubernetes
+        client-secret: YOUR_SECRET
+        id-token: ey...       # kubelogin will update ID token here
+        refresh-token: ey...  # kubelogin will update refresh token here
+      name: oidc
+```
+
+Make sure you can access to the Kubernetes cluster.
+
+```
+% kubectl get nodes
+NAME                                    STATUS    ROLES     AGE       VERSION
+ip-1-2-3-4.us-west-2.compute.internal   Ready     node      21d       v1.9.6
+ip-1-2-3-5.us-west-2.compute.internal   Ready     node      20d       v1.9.6
+```

docs/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.

go.mod

@@ -0,0 +1,32 @@
+module github.com/int128/kubelogin
+
+require (
+	github.com/coreos/go-oidc v2.0.0+incompatible
+	github.com/dgrijalva/jwt-go v3.2.0+incompatible
+	github.com/go-test/deep v1.0.1
+	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/google/wire v0.2.2
+	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/cobra v0.0.4
+	github.com/spf13/pflag v1.0.3
+	github.com/stretchr/testify v1.3.0 // indirect
+	golang.org/x/crypto v0.0.0-20190422183909-d864b10871cd
+	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
+)

go.sum

@@ -0,0 +1,130 @@
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integration-test/auth.go

@@ -1,104 +0,0 @@
-package integration
-
-import (
-	"crypto/rand"
-	"crypto/rsa"
-	"encoding/base64"
-	"fmt"
-	"html/template"
-	"log"
-	"math/big"
-	"net/http"
-	"testing"
-	"time"
-
-	jwt "github.com/dgrijalva/jwt-go"
-)
-
-// AuthHandler provides the stub handler for OIDC authentication.
-type AuthHandler struct {
-	// Values in templates
-	Issuer     string
-	AuthCode   string
-	IDToken    string
-	PrivateKey struct{ N, E string }
-
-	// Response templates
-	discoveryJSON *template.Template
-	tokenJSON     *template.Template
-	jwksJSON      *template.Template
-}
-
-// NewAuthHandler returns a new AuthHandler.
-func NewAuthHandler(t *testing.T, issuer string) *AuthHandler {
-	h := &AuthHandler{
-		Issuer:        issuer,
-		AuthCode:      "0b70006b-f62a-4438-aba5-c0b96775d8e5",
-		discoveryJSON: template.Must(template.ParseFiles("testdata/oidc-discovery.json")),
-		tokenJSON:     template.Must(template.ParseFiles("testdata/oidc-token.json")),
-		jwksJSON:      template.Must(template.ParseFiles("testdata/oidc-jwks.json")),
-	}
-	token := jwt.NewWithClaims(jwt.SigningMethodRS256, jwt.StandardClaims{
-		Issuer:    h.Issuer,
-		Audience:  "kubernetes",
-		ExpiresAt: time.Now().Add(time.Hour).Unix(),
-	})
-	k, err := rsa.GenerateKey(rand.Reader, 1024)
-	if err != nil {
-		t.Fatalf("Could not generate a key pair: %s", err)
-	}
-	h.IDToken, err = token.SignedString(k)
-	if err != nil {
-		t.Fatalf("Could not generate an ID token: %s", err)
-	}
-	h.PrivateKey.E = base64.RawURLEncoding.EncodeToString(big.NewInt(int64(k.E)).Bytes())
-	h.PrivateKey.N = base64.RawURLEncoding.EncodeToString(k.N.Bytes())
-	return h
-}
-
-func (s *AuthHandler) serveHTTP(w http.ResponseWriter, r *http.Request) error {
-	m := r.Method
-	p := r.URL.Path
-	log.Printf("[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 := s.discoveryJSON.Execute(w, s); err != nil {
-			return err
-		}
-	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()
-		to := fmt.Sprintf("%s?state=%s&code=%s", q.Get("redirect_uri"), q.Get("state"), s.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 err
-		}
-		if s.AuthCode != r.Form.Get("code") {
-			return fmt.Errorf("code wants %s but %s", s.AuthCode, r.Form.Get("code"))
-		}
-		w.Header().Add("Content-Type", "application/json")
-		if err := s.tokenJSON.Execute(w, s); err != nil {
-			return err
-		}
-	case m == "GET" && p == "/protocol/openid-connect/certs":
-		w.Header().Add("Content-Type", "application/json")
-		if err := s.jwksJSON.Execute(w, s); err != nil {
-			return err
-		}
-	default:
-		http.Error(w, "Not Found", 404)
-	}
-	return nil
-}
-
-func (s *AuthHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
-	if err := s.serveHTTP(w, r); err != nil {
-		log.Printf("[auth-server] Error: %s", err)
-		w.WriteHeader(500)
-	}
-}

integration-test/integration_test.go

@@ -1,160 +0,0 @@
-package integration
-
-import (
-	"context"
-	"crypto/tls"
-	"crypto/x509"
-	"encoding/base64"
-	"io/ioutil"
-	"net/http"
-	"os"
-	"testing"
-	"time"
-
-	"github.com/int128/kubelogin/cli"
-)
-
-const caCert = "testdata/authserver-ca.crt"
-const tlsCert = "testdata/authserver.crt"
-const tlsKey = "testdata/authserver.key"
-
-func Test(t *testing.T) {
-	ctx := context.Background()
-	authServer := &http.Server{
-		Addr:    "localhost:9000",
-		Handler: NewAuthHandler(t, "http://localhost:9000"),
-	}
-	defer authServer.Shutdown(ctx)
-	kubeconfig := createKubeconfig(t, &kubeconfigValues{
-		Issuer: "http://localhost:9000",
-	})
-	defer os.Remove(kubeconfig)
-
-	go listenAndServe(t, authServer)
-	go authenticate(t, &tls.Config{})
-
-	c := cli.CLI{
-		KubeConfig: kubeconfig,
-	}
-	if err := c.Run(ctx); err != nil {
-		t.Fatal(err)
-	}
-	verifyKubeconfig(t, kubeconfig)
-}
-
-func TestWithSkipTLSVerify(t *testing.T) {
-	ctx := context.Background()
-	authServer := &http.Server{
-		Addr:    "localhost:9000",
-		Handler: NewAuthHandler(t, "https://localhost:9000"),
-	}
-	defer authServer.Shutdown(ctx)
-	kubeconfig := createKubeconfig(t, &kubeconfigValues{
-		Issuer: "https://localhost:9000",
-	})
-	defer os.Remove(kubeconfig)
-
-	go listenAndServeTLS(t, authServer)
-	go authenticate(t, &tls.Config{InsecureSkipVerify: true})
-
-	c := cli.CLI{
-		KubeConfig:    kubeconfig,
-		SkipTLSVerify: true,
-	}
-	if err := c.Run(ctx); err != nil {
-		t.Fatal(err)
-	}
-	verifyKubeconfig(t, kubeconfig)
-}
-
-func TestWithCACert(t *testing.T) {
-	ctx := context.Background()
-	authServer := &http.Server{
-		Addr:    "localhost:9000",
-		Handler: NewAuthHandler(t, "https://localhost:9000"),
-	}
-	defer authServer.Shutdown(ctx)
-	kubeconfig := createKubeconfig(t, &kubeconfigValues{
-		Issuer:                  "https://localhost:9000",
-		IDPCertificateAuthority: caCert,
-	})
-	defer os.Remove(kubeconfig)
-
-	go listenAndServeTLS(t, authServer)
-	go authenticate(t, &tls.Config{RootCAs: loadCACert(t)})
-
-	c := cli.CLI{
-		KubeConfig: kubeconfig,
-	}
-	if err := c.Run(ctx); err != nil {
-		t.Fatal(err)
-	}
-	verifyKubeconfig(t, kubeconfig)
-}
-
-func TestWithCACertData(t *testing.T) {
-	ctx := context.Background()
-	authServer := &http.Server{
-		Addr:    "localhost:9000",
-		Handler: NewAuthHandler(t, "https://localhost:9000"),
-	}
-	defer authServer.Shutdown(ctx)
-	b, err := ioutil.ReadFile(caCert)
-	if err != nil {
-		t.Fatal(err)
-	}
-	kubeconfig := createKubeconfig(t, &kubeconfigValues{
-		Issuer: "https://localhost:9000",
-		IDPCertificateAuthorityData: base64.StdEncoding.EncodeToString(b),
-	})
-	defer os.Remove(kubeconfig)
-
-	go listenAndServeTLS(t, authServer)
-	go authenticate(t, &tls.Config{RootCAs: loadCACert(t)})
-
-	c := cli.CLI{
-		KubeConfig: kubeconfig,
-	}
-	if err := c.Run(ctx); err != nil {
-		t.Fatal(err)
-	}
-	verifyKubeconfig(t, kubeconfig)
-}
-
-func authenticate(t *testing.T, tlsConfig *tls.Config) {
-	t.Helper()
-	time.Sleep(100 * time.Millisecond)
-	client := http.Client{Transport: &http.Transport{TLSClientConfig: tlsConfig}}
-	res, err := client.Get("http://localhost:8000/")
-	if err != nil {
-		t.Error(err)
-		return
-	}
-	if res.StatusCode != 200 {
-		t.Errorf("StatusCode wants 200 but %d: res=%+v", res.StatusCode, res)
-	}
-}
-
-func loadCACert(t *testing.T) *x509.CertPool {
-	p := x509.NewCertPool()
-	b, err := ioutil.ReadFile(caCert)
-	if err != nil {
-		t.Fatal(err)
-	}
-	if !p.AppendCertsFromPEM(b) {
-		t.Fatalf("Could not AppendCertsFromPEM")
-	}
-	return p
-}
-
-func listenAndServe(t *testing.T, s *http.Server) {
-	if err := s.ListenAndServe(); err != nil && err != http.ErrServerClosed {
-		t.Fatal(err)
-	}
-}
-
-func listenAndServeTLS(t *testing.T, s *http.Server) {
-	if err := s.ListenAndServeTLS(tlsCert, tlsKey); err != nil && err != http.ErrServerClosed {
-		t.Fatal(err)
-	}
-}

integration-test/kubeconfig.go

@@ -1,44 +0,0 @@
-package integration
-
-import (
-	"html/template"
-	"io/ioutil"
-	"strings"
-	"testing"
-)
-
-type kubeconfigValues struct {
-	Issuer                      string
-	IDPCertificateAuthority     string
-	IDPCertificateAuthorityData string
-}
-
-func createKubeconfig(t *testing.T, v *kubeconfigValues) string {
-	t.Helper()
-	f, err := ioutil.TempFile("", "kubeconfig")
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer f.Close()
-	tpl, err := template.ParseFiles("testdata/kubeconfig.yaml")
-	if err != nil {
-		t.Fatal(err)
-	}
-	if err := tpl.Execute(f, v); err != nil {
-		t.Fatal(err)
-	}
-	return f.Name()
-}
-
-func verifyKubeconfig(t *testing.T, kubeconfig string) {
-	b, err := ioutil.ReadFile(kubeconfig)
-	if err != nil {
-		t.Fatal(err)
-	}
-	if strings.Index(string(b), "id-token: ey") == -1 {
-		t.Errorf("kubeconfig wants id-token but %s", string(b))
-	}
-	if strings.Index(string(b), "refresh-token: 44df4c82-5ce7-4260-b54d-1da0d396ef2a") == -1 {
-		t.Errorf("kubeconfig wants refresh-token but %s", string(b))
-	}
-}

kubeconfig/auth.go

@@ -1,66 +0,0 @@
-package kubeconfig
-
-import (
-	"fmt"
-
-	"k8s.io/client-go/tools/clientcmd/api"
-)
-
-// 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]
-}
-
-// ToOIDCAuthProviderConfig converts from api.AuthInfo to OIDCAuthProviderConfig.
-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
-}
-
-// OIDCAuthProviderConfig represents OIDC configuration in the kubeconfig.
-type OIDCAuthProviderConfig api.AuthProviderConfig
-
-// IDPIssuerURL returns the idp-issuer-url.
-func (c *OIDCAuthProviderConfig) IDPIssuerURL() string {
-	return c.Config["idp-issuer-url"]
-}
-
-// ClientID returns the client-id.
-func (c *OIDCAuthProviderConfig) ClientID() string {
-	return c.Config["client-id"]
-}
-
-// ClientSecret returns the client-secret.
-func (c *OIDCAuthProviderConfig) ClientSecret() string {
-	return c.Config["client-secret"]
-}
-
-// IDPCertificateAuthority returns the idp-certificate-authority.
-func (c *OIDCAuthProviderConfig) IDPCertificateAuthority() string {
-	return c.Config["idp-certificate-authority"]
-}
-
-// IDPCertificateAuthorityData returns the idp-certificate-authority-data.
-func (c *OIDCAuthProviderConfig) IDPCertificateAuthorityData() string {
-	return c.Config["idp-certificate-authority-data"]
-}
-
-// SetIDToken replaces the id-token.
-func (c *OIDCAuthProviderConfig) SetIDToken(idToken string) {
-	c.Config["id-token"] = idToken
-}
-
-// SetRefreshToken replaces the refresh-token.
-func (c *OIDCAuthProviderConfig) SetRefreshToken(refreshToken string) {
-	c.Config["refresh-token"] = refreshToken
-}

kubeconfig/kubeconfig.go

@@ -1,22 +0,0 @@
-package kubeconfig
-
-import (
-	"fmt"
-
-	"k8s.io/client-go/tools/clientcmd"
-	"k8s.io/client-go/tools/clientcmd/api"
-)
-
-// 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)
-}

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

main.go

@@ -2,19 +2,13 @@ package main
 
 import (
 	"context"
-	"log"
 	"os"
 
-	"github.com/int128/kubelogin/cli"
+	"github.com/int128/kubelogin/di"
 )
 
+var version = "HEAD"
+
 func main() {
-	c, err := cli.Parse(os.Args)
-	if err != nil {
-		log.Fatal(err)
-	}
-	ctx := context.Background()
-	if err := c.Run(ctx); err != nil {
-		log.Fatal(err)
-	}
+	os.Exit(di.NewCmd().Run(context.Background(), os.Args, version))
 }

models/kubeconfig/kubeconfig.go

@@ -0,0 +1,27 @@
+package kubeconfig
+
+// ContextName represents name of a context.
+type ContextName string
+
+// UserName represents name of a user.
+type UserName string
+
+// Auth represents the authentication provider,
+// i.e. context, user and auth-provider in a kubeconfig.
+type Auth struct {
+	LocationOfOrigin string      // Path to the kubeconfig file which contains the user
+	UserName         UserName    // User name
+	ContextName      ContextName // Context name (optional)
+	OIDCConfig       OIDCConfig
+}
+
+type OIDCConfig struct {
+	IDPIssuerURL                string   // idp-issuer-url
+	ClientID                    string   // client-id
+	ClientSecret                string   // client-secret
+	IDPCertificateAuthority     string   // (optional) idp-certificate-authority
+	IDPCertificateAuthorityData string   // (optional) idp-certificate-authority-data
+	ExtraScopes                 []string // (optional) extra-scopes
+	IDToken                     string   // (optional) id-token
+	RefreshToken                string   // (optional) refresh-token
+}

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

usecases/login/exec.go

@@ -0,0 +1,104 @@
+package login
+
+import (
+	"context"
+
+	"github.com/int128/kubelogin/adaptors"
+	"github.com/int128/kubelogin/usecases"
+	"github.com/pkg/errors"
+)
+
+// Exec provide the use case of wrapping the kubectl command.
+// If the current auth provider is not oidc, just run kubectl.
+// If the kubeconfig has a valid token, just run kubectl.
+// Otherwise, update the kubeconfig and run kubectl.
+type Exec struct {
+	Kubeconfig         adaptors.Kubeconfig
+	OIDC               adaptors.OIDC
+	Env                adaptors.Env
+	Logger             adaptors.Logger
+	ShowLocalServerURL usecases.LoginShowLocalServerURL
+}
+
+func (u *Exec) Do(ctx context.Context, in usecases.LoginAndExecIn) (*usecases.LoginAndExecOut, error) {
+	if err := u.doInternal(ctx, in.LoginIn); err != nil {
+		return nil, errors.WithStack(err)
+	}
+	exitCode, err := u.Env.Exec(ctx, in.Executable, in.Args)
+	if err != nil {
+		return nil, errors.Wrapf(err, "could not execute kubectl")
+	}
+	return &usecases.LoginAndExecOut{ExitCode: exitCode}, nil
+}
+
+func (u *Exec) doInternal(ctx context.Context, in usecases.LoginIn) error {
+	u.Logger.Debugf(1, "WARNING: log may contain your secrets such as token or password")
+
+	auth, err := u.Kubeconfig.GetCurrentAuth(in.KubeconfigFilename, in.KubeconfigContext, in.KubeconfigUser)
+	if err != nil {
+		u.Logger.Debugf(1, "The current authentication provider is not oidc: %s", err)
+		return nil
+	}
+	u.Logger.Debugf(1, "Using the authentication provider of the user %s", auth.UserName)
+	u.Logger.Debugf(1, "A token will be written to %s", auth.LocationOfOrigin)
+
+	client, err := u.OIDC.New(adaptors.OIDCClientConfig{
+		Config:         auth.OIDCConfig,
+		CACertFilename: in.CACertFilename,
+		SkipTLSVerify:  in.SkipTLSVerify,
+	})
+	if err != nil {
+		return errors.Wrapf(err, "could not create an OIDC client")
+	}
+
+	if auth.OIDCConfig.IDToken != "" {
+		u.Logger.Debugf(1, "Found the ID token in the kubeconfig")
+		token, err := client.Verify(ctx, adaptors.OIDCVerifyIn{Config: auth.OIDCConfig})
+		if err == nil {
+			u.Logger.Debugf(1, "You already have a valid token until %s", token.Expiry)
+			dumpIDToken(u.Logger, token)
+			return nil
+		}
+		u.Logger.Debugf(1, "The ID token was invalid: %s", err)
+	}
+
+	var tokenSet *adaptors.OIDCAuthenticateOut
+	if in.Username != "" {
+		if in.Password == "" {
+			in.Password, err = u.Env.ReadPassword(passwordPrompt)
+			if err != nil {
+				return errors.Wrapf(err, "could not read a password")
+			}
+		}
+		out, err := client.AuthenticateByPassword(ctx, adaptors.OIDCAuthenticateByPasswordIn{
+			Config:   auth.OIDCConfig,
+			Username: in.Username,
+			Password: in.Password,
+		})
+		if err != nil {
+			return errors.Wrapf(err, "error while the resource owner password credentials grant flow")
+		}
+		tokenSet = out
+	} else {
+		out, err := client.AuthenticateByCode(ctx, adaptors.OIDCAuthenticateByCodeIn{
+			Config:             auth.OIDCConfig,
+			LocalServerPort:    in.ListenPort,
+			SkipOpenBrowser:    in.SkipOpenBrowser,
+			ShowLocalServerURL: u.ShowLocalServerURL,
+		})
+		if err != nil {
+			return errors.Wrapf(err, "error while the authorization code grant flow")
+		}
+		tokenSet = out
+	}
+	u.Logger.Printf("You got a valid token until %s", tokenSet.VerifiedIDToken.Expiry)
+	dumpIDToken(u.Logger, tokenSet.VerifiedIDToken)
+	auth.OIDCConfig.IDToken = tokenSet.IDToken
+	auth.OIDCConfig.RefreshToken = tokenSet.RefreshToken
+
+	u.Logger.Debugf(1, "Writing the ID token and refresh token to %s", auth.LocationOfOrigin)
+	if err := u.Kubeconfig.UpdateAuth(auth); err != nil {
+		return errors.Wrapf(err, "could not write the token to the kubeconfig")
+	}
+	return nil
+}

usecases/login/exec_test.go

@@ -0,0 +1,98 @@
+package login
+
+import (
+	"context"
+	"testing"
+
+	"github.com/golang/mock/gomock"
+	"github.com/int128/kubelogin/adaptors"
+	"github.com/int128/kubelogin/adaptors/mock_adaptors"
+	"github.com/int128/kubelogin/models/kubeconfig"
+	"github.com/int128/kubelogin/usecases"
+	"github.com/pkg/errors"
+)
+
+func TestExec_Do(t *testing.T) {
+	t.Run("Defaults", func(t *testing.T) {
+		ctrl := gomock.NewController(t)
+		defer ctrl.Finish()
+		ctx := context.TODO()
+		auth := newAuth("", "")
+
+		mockKubeconfig := mock_adaptors.NewMockKubeconfig(ctrl)
+		mockKubeconfig.EXPECT().
+			GetCurrentAuth("", kubeconfig.ContextName(""), kubeconfig.UserName("")).
+			Return(auth, nil)
+		mockKubeconfig.EXPECT().
+			UpdateAuth(newAuth("YOUR_ID_TOKEN", "YOUR_REFRESH_TOKEN"))
+
+		mockOIDC := mock_adaptors.NewMockOIDC(ctrl)
+		mockOIDC.EXPECT().
+			New(adaptors.OIDCClientConfig{Config: auth.OIDCConfig}).
+			Return(newMockCodeOIDC(ctrl, ctx, adaptors.OIDCAuthenticateByCodeIn{
+				Config:          auth.OIDCConfig,
+				LocalServerPort: []int{10000},
+			}), nil)
+
+		mockEnv := mock_adaptors.NewMockEnv(ctrl)
+		mockEnv.EXPECT().
+			Exec(ctx, "kubectl", []string{"foo", "bar"}).
+			Return(0, nil)
+
+		u := Exec{
+			Kubeconfig: mockKubeconfig,
+			OIDC:       mockOIDC,
+			Env:        mockEnv,
+			Logger:     mock_adaptors.NewLogger(t, ctrl),
+		}
+		out, err := u.Do(ctx, usecases.LoginAndExecIn{
+			LoginIn: usecases.LoginIn{
+				ListenPort: []int{10000},
+			},
+			Executable: "kubectl",
+			Args:       []string{"foo", "bar"},
+		})
+		if err != nil {
+			t.Errorf("Do returned error: %+v", err)
+		}
+		if out.ExitCode != 0 {
+			t.Errorf("ExitCode wants 0 but %d", out.ExitCode)
+		}
+	})
+
+	t.Run("NoOIDCConfig", func(t *testing.T) {
+		ctrl := gomock.NewController(t)
+		defer ctrl.Finish()
+		ctx := context.TODO()
+
+		mockKubeconfig := mock_adaptors.NewMockKubeconfig(ctrl)
+		mockKubeconfig.EXPECT().
+			GetCurrentAuth("", kubeconfig.ContextName(""), kubeconfig.UserName("")).
+			Return(nil, errors.New("no oidc config"))
+
+		mockEnv := mock_adaptors.NewMockEnv(ctrl)
+		mockEnv.EXPECT().
+			Exec(ctx, "kubectl", []string{"foo", "bar"}).
+			Return(0, nil)
+
+		u := Exec{
+			Kubeconfig: mockKubeconfig,
+			OIDC:       mock_adaptors.NewMockOIDC(ctrl),
+			Env:        mockEnv,
+			Logger:     mock_adaptors.NewLogger(t, ctrl),
+		}
+		out, err := u.Do(ctx, usecases.LoginAndExecIn{
+			LoginIn: usecases.LoginIn{
+				ListenPort: []int{10000},
+			},
+			Executable: "kubectl",
+			Args:       []string{"foo", "bar"},
+		})
+		if err != nil {
+			t.Errorf("Do returned error: %+v", err)
+		}
+		if out.ExitCode != 0 {
+			t.Errorf("ExitCode wants 0 but %d", out.ExitCode)
+		}
+	})
+}

usecases/login/login.go

@@ -0,0 +1,122 @@
+package login
+
+import (
+	"context"
+
+	"github.com/coreos/go-oidc"
+	"github.com/int128/kubelogin/adaptors"
+	"github.com/int128/kubelogin/usecases"
+	"github.com/pkg/errors"
+)
+
+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`
+
+const passwordPrompt = "Password: "
+
+// Login provides the use case of login to the provider.
+// If the current auth provider is not oidc, show the error.
+// If the kubeconfig has a valid token, do nothing.
+// Otherwise, update the kubeconfig.
+type Login struct {
+	Kubeconfig         adaptors.Kubeconfig
+	OIDC               adaptors.OIDC
+	Env                adaptors.Env
+	Logger             adaptors.Logger
+	ShowLocalServerURL usecases.LoginShowLocalServerURL
+}
+
+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")
+
+	auth, err := u.Kubeconfig.GetCurrentAuth(in.KubeconfigFilename, in.KubeconfigContext, in.KubeconfigUser)
+	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)
+	u.Logger.Debugf(1, "A token will be written to %s", auth.LocationOfOrigin)
+
+	client, err := u.OIDC.New(adaptors.OIDCClientConfig{
+		Config:         auth.OIDCConfig,
+		CACertFilename: in.CACertFilename,
+		SkipTLSVerify:  in.SkipTLSVerify,
+	})
+	if err != nil {
+		return errors.Wrapf(err, "could not create an OIDC client")
+	}
+
+	if auth.OIDCConfig.IDToken != "" {
+		u.Logger.Debugf(1, "Found the ID token in the kubeconfig")
+		token, err := client.Verify(ctx, adaptors.OIDCVerifyIn{Config: auth.OIDCConfig})
+		if err == nil {
+			u.Logger.Printf("You already have a valid token until %s", token.Expiry)
+			dumpIDToken(u.Logger, token)
+			return nil
+		}
+		u.Logger.Debugf(1, "The ID token was invalid: %s", err)
+	}
+
+	var tokenSet *adaptors.OIDCAuthenticateOut
+	if in.Username != "" {
+		if in.Password == "" {
+			in.Password, err = u.Env.ReadPassword(passwordPrompt)
+			if err != nil {
+				return errors.Wrapf(err, "could not read a password")
+			}
+		}
+		out, err := client.AuthenticateByPassword(ctx, adaptors.OIDCAuthenticateByPasswordIn{
+			Config:   auth.OIDCConfig,
+			Username: in.Username,
+			Password: in.Password,
+		})
+		if err != nil {
+			return errors.Wrapf(err, "error while the resource owner password credentials grant flow")
+		}
+		tokenSet = out
+	} else {
+		out, err := client.AuthenticateByCode(ctx, adaptors.OIDCAuthenticateByCodeIn{
+			Config:             auth.OIDCConfig,
+			LocalServerPort:    in.ListenPort,
+			SkipOpenBrowser:    in.SkipOpenBrowser,
+			ShowLocalServerURL: u.ShowLocalServerURL,
+		})
+		if err != nil {
+			return errors.Wrapf(err, "error while the authorization code grant flow")
+		}
+		tokenSet = out
+	}
+	u.Logger.Printf("You got a valid token until %s", tokenSet.VerifiedIDToken.Expiry)
+	dumpIDToken(u.Logger, tokenSet.VerifiedIDToken)
+	auth.OIDCConfig.IDToken = tokenSet.IDToken
+	auth.OIDCConfig.RefreshToken = tokenSet.RefreshToken
+
+	u.Logger.Debugf(1, "Writing the ID token and refresh token to %s", auth.LocationOfOrigin)
+	if err := u.Kubeconfig.UpdateAuth(auth); err != nil {
+		return errors.Wrapf(err, "could not write the token to the kubeconfig")
+	}
+	return nil
+}
+
+func dumpIDToken(logger adaptors.Logger, token *oidc.IDToken) {
+	var claims map[string]interface{}
+	if err := token.Claims(&claims); err != nil {
+		logger.Debugf(1, "Error while inspection of the ID token: %s", err)
+	}
+	for k, v := range claims {
+		logger.Debugf(1, "The ID token has the claim: %s=%v", k, v)
+	}
+}
+
+// ShowLocalServerURL just shows the URL of local server to console.
+type ShowLocalServerURL struct {
+	Logger adaptors.Logger
+}
+
+func (s *ShowLocalServerURL) ShowLocalServerURL(url string) {
+	s.Logger.Printf("Open %s for authentication", url)
+}

usecases/login/login_test.go

@@ -0,0 +1,264 @@
+package login
+
+import (
+	"context"
+	"testing"
+	"time"
+
+	"github.com/coreos/go-oidc"
+	"github.com/golang/mock/gomock"
+	"github.com/int128/kubelogin/adaptors"
+	"github.com/int128/kubelogin/adaptors/mock_adaptors"
+	"github.com/int128/kubelogin/models/kubeconfig"
+	"github.com/int128/kubelogin/usecases"
+	"github.com/pkg/errors"
+)
+
+func newMockCodeOIDC(ctrl *gomock.Controller, ctx context.Context, in adaptors.OIDCAuthenticateByCodeIn) *mock_adaptors.MockOIDCClient {
+	mockOIDCClient := mock_adaptors.NewMockOIDCClient(ctrl)
+	mockOIDCClient.EXPECT().
+		AuthenticateByCode(ctx, in).
+		Return(&adaptors.OIDCAuthenticateOut{
+			VerifiedIDToken: &oidc.IDToken{Subject: "SUBJECT"},
+			IDToken:         "YOUR_ID_TOKEN",
+			RefreshToken:    "YOUR_REFRESH_TOKEN",
+		}, nil)
+	return mockOIDCClient
+}
+
+func newMockPasswordOIDC(ctrl *gomock.Controller, ctx context.Context, in adaptors.OIDCAuthenticateByPasswordIn) *mock_adaptors.MockOIDCClient {
+	mockOIDCClient := mock_adaptors.NewMockOIDCClient(ctrl)
+	mockOIDCClient.EXPECT().
+		AuthenticateByPassword(ctx, in).
+		Return(&adaptors.OIDCAuthenticateOut{
+			VerifiedIDToken: &oidc.IDToken{Subject: "SUBJECT"},
+			IDToken:         "YOUR_ID_TOKEN",
+			RefreshToken:    "YOUR_REFRESH_TOKEN",
+		}, nil)
+	return mockOIDCClient
+}
+
+func newAuth(idToken, refreshToken string) *kubeconfig.Auth {
+	return &kubeconfig.Auth{
+		LocationOfOrigin: "theLocation",
+		UserName:         "google",
+		OIDCConfig: kubeconfig.OIDCConfig{
+			IDPIssuerURL: "https://accounts.google.com",
+			ClientID:     "YOUR_CLIENT_ID",
+			ClientSecret: "YOUR_CLIENT_SECRET",
+			IDToken:      idToken,
+			RefreshToken: refreshToken,
+		},
+	}
+}
+
+func TestLogin_Do(t *testing.T) {
+	t.Run("Defaults", func(t *testing.T) {
+		ctrl := gomock.NewController(t)
+		defer ctrl.Finish()
+		ctx := context.TODO()
+		auth := newAuth("", "")
+
+		mockKubeconfig := mock_adaptors.NewMockKubeconfig(ctrl)
+		mockKubeconfig.EXPECT().
+			GetCurrentAuth("", kubeconfig.ContextName(""), kubeconfig.UserName("")).
+			Return(auth, nil)
+		mockKubeconfig.EXPECT().
+			UpdateAuth(newAuth("YOUR_ID_TOKEN", "YOUR_REFRESH_TOKEN"))
+
+		mockOIDC := mock_adaptors.NewMockOIDC(ctrl)
+		mockOIDC.EXPECT().
+			New(adaptors.OIDCClientConfig{Config: auth.OIDCConfig}).
+			Return(newMockCodeOIDC(ctrl, ctx, adaptors.OIDCAuthenticateByCodeIn{
+				Config:          auth.OIDCConfig,
+				LocalServerPort: []int{10000},
+			}), nil)
+
+		u := Login{
+			Kubeconfig: mockKubeconfig,
+			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("FullOptions", func(t *testing.T) {
+		ctrl := gomock.NewController(t)
+		defer ctrl.Finish()
+		ctx := context.TODO()
+		auth := newAuth("", "")
+
+		mockKubeconfig := mock_adaptors.NewMockKubeconfig(ctrl)
+		mockKubeconfig.EXPECT().
+			GetCurrentAuth("/path/to/kubeconfig", kubeconfig.ContextName("theContext"), kubeconfig.UserName("theUser")).
+			Return(auth, nil)
+		mockKubeconfig.EXPECT().
+			UpdateAuth(newAuth("YOUR_ID_TOKEN", "YOUR_REFRESH_TOKEN"))
+
+		mockOIDC := mock_adaptors.NewMockOIDC(ctrl)
+		mockOIDC.EXPECT().
+			New(adaptors.OIDCClientConfig{
+				Config:         auth.OIDCConfig,
+				CACertFilename: "/path/to/cert",
+				SkipTLSVerify:  true,
+			}).
+			Return(newMockPasswordOIDC(ctrl, ctx, adaptors.OIDCAuthenticateByPasswordIn{
+				Config:   auth.OIDCConfig,
+				Username: "USER",
+				Password: "PASS",
+			}), nil)
+
+		u := Login{
+			Kubeconfig: mockKubeconfig,
+			OIDC:       mockOIDC,
+			Logger:     mock_adaptors.NewLogger(t, ctrl),
+		}
+		if err := u.Do(ctx, usecases.LoginIn{
+			KubeconfigFilename: "/path/to/kubeconfig",
+			KubeconfigContext:  "theContext",
+			KubeconfigUser:     "theUser",
+			Username:           "USER",
+			Password:           "PASS",
+			CACertFilename:     "/path/to/cert",
+			SkipTLSVerify:      true,
+		}); err != nil {
+			t.Errorf("Do returned error: %+v", err)
+		}
+	})
+
+	t.Run("AskPassword", func(t *testing.T) {
+		ctrl := gomock.NewController(t)
+		defer ctrl.Finish()
+		ctx := context.TODO()
+		auth := newAuth("", "")
+
+		mockKubeconfig := mock_adaptors.NewMockKubeconfig(ctrl)
+		mockKubeconfig.EXPECT().
+			GetCurrentAuth("", kubeconfig.ContextName(""), kubeconfig.UserName("")).
+			Return(auth, nil)
+		mockKubeconfig.EXPECT().
+			UpdateAuth(newAuth("YOUR_ID_TOKEN", "YOUR_REFRESH_TOKEN"))
+
+		mockOIDC := mock_adaptors.NewMockOIDC(ctrl)
+		mockOIDC.EXPECT().
+			New(adaptors.OIDCClientConfig{Config: auth.OIDCConfig}).
+			Return(newMockPasswordOIDC(ctrl, ctx, adaptors.OIDCAuthenticateByPasswordIn{
+				Config:   auth.OIDCConfig,
+				Username: "USER",
+				Password: "PASS",
+			}), nil)
+
+		mockEnv := mock_adaptors.NewMockEnv(ctrl)
+		mockEnv.EXPECT().ReadPassword(passwordPrompt).Return("PASS", nil)
+
+		u := Login{
+			Kubeconfig: mockKubeconfig,
+			OIDC:       mockOIDC,
+			Logger:     mock_adaptors.NewLogger(t, ctrl),
+			Env:        mockEnv,
+		}
+		if err := u.Do(ctx, usecases.LoginIn{
+			Username: "USER",
+		}); err != nil {
+			t.Errorf("Do returned error: %+v", err)
+		}
+	})
+
+	t.Run("AskPasswordError", func(t *testing.T) {
+		ctrl := gomock.NewController(t)
+		defer ctrl.Finish()
+		ctx := context.TODO()
+		auth := newAuth("", "")
+
+		mockKubeconfig := mock_adaptors.NewMockKubeconfig(ctrl)
+		mockKubeconfig.EXPECT().
+			GetCurrentAuth("", kubeconfig.ContextName(""), kubeconfig.UserName("")).
+			Return(auth, nil)
+
+		mockOIDC := mock_adaptors.NewMockOIDC(ctrl)
+		mockOIDC.EXPECT().
+			New(adaptors.OIDCClientConfig{Config: auth.OIDCConfig}).
+			Return(mock_adaptors.NewMockOIDCClient(ctrl), nil)
+
+		mockEnv := mock_adaptors.NewMockEnv(ctrl)
+		mockEnv.EXPECT().ReadPassword(passwordPrompt).Return("", errors.New("error"))
+
+		u := Login{
+			Kubeconfig: mockKubeconfig,
+			OIDC:       mockOIDC,
+			Logger:     mock_adaptors.NewLogger(t, ctrl),
+			Env:        mockEnv,
+		}
+		if err := u.Do(ctx, usecases.LoginIn{
+			Username: "USER",
+		}); err == nil {
+			t.Errorf("err wants an error but nil")
+		}
+	})
+
+	t.Run("KubeconfigHasValidToken", func(t *testing.T) {
+		ctrl := gomock.NewController(t)
+		defer ctrl.Finish()
+		ctx := context.TODO()
+		auth := newAuth("VALID_ID_TOKEN", "N/A")
+
+		mockKubeconfig := mock_adaptors.NewMockKubeconfig(ctrl)
+		mockKubeconfig.EXPECT().
+			GetCurrentAuth("", kubeconfig.ContextName(""), kubeconfig.UserName("")).
+			Return(auth, nil)
+
+		mockOIDCClient := mock_adaptors.NewMockOIDCClient(ctrl)
+		mockOIDCClient.EXPECT().
+			Verify(ctx, adaptors.OIDCVerifyIn{Config: auth.OIDCConfig}).
+			Return(&oidc.IDToken{Expiry: time.Now()}, nil)
+		mockOIDC := mock_adaptors.NewMockOIDC(ctrl)
+		mockOIDC.EXPECT().
+			New(adaptors.OIDCClientConfig{Config: auth.OIDCConfig}).
+			Return(mockOIDCClient, nil)
+
+		u := Login{
+			Kubeconfig: mockKubeconfig,
+			OIDC:       mockOIDC,
+			Logger:     mock_adaptors.NewLogger(t, ctrl),
+		}
+		if err := u.Do(ctx, usecases.LoginIn{}); err != nil {
+			t.Errorf("Do returned error: %+v", err)
+		}
+	})
+
+	t.Run("KubeconfigHasExpiredToken", func(t *testing.T) {
+		ctrl := gomock.NewController(t)
+		defer ctrl.Finish()
+		ctx := context.TODO()
+		auth := newAuth("EXPIRED_ID_TOKEN", "EXPIRED_REFRESH_TOKEN")
+
+		mockKubeconfig := mock_adaptors.NewMockKubeconfig(ctrl)
+		mockKubeconfig.EXPECT().
+			GetCurrentAuth("", kubeconfig.ContextName(""), kubeconfig.UserName("")).
+			Return(auth, nil)
+		mockKubeconfig.EXPECT().
+			UpdateAuth(newAuth("YOUR_ID_TOKEN", "YOUR_REFRESH_TOKEN"))
+
+		mockOIDCClient := newMockCodeOIDC(ctrl, ctx, adaptors.OIDCAuthenticateByCodeIn{Config: auth.OIDCConfig})
+		mockOIDCClient.EXPECT().
+			Verify(ctx, adaptors.OIDCVerifyIn{Config: auth.OIDCConfig}).
+			Return(nil, errors.New("token expired"))
+		mockOIDC := mock_adaptors.NewMockOIDC(ctrl)
+		mockOIDC.EXPECT().
+			New(adaptors.OIDCClientConfig{Config: auth.OIDCConfig}).
+			Return(mockOIDCClient, nil)
+
+		u := Login{
+			Kubeconfig: mockKubeconfig,
+			OIDC:       mockOIDC,
+			Logger:     mock_adaptors.NewLogger(t, ctrl),
+		}
+		if err := u.Do(ctx, usecases.LoginIn{}); err != nil {
+			t.Errorf("Do returned error: %+v", err)
+		}
+	})
+}

usecases/mock_usecases/mock_usecases.go

@@ -0,0 +1,83 @@
+// Code generated by MockGen. DO NOT EDIT.
+// Source: github.com/int128/kubelogin/usecases (interfaces: Login,LoginAndExec)
+
+// Package mock_usecases is a generated GoMock package.
+package mock_usecases
+
+import (
+	context "context"
+	gomock "github.com/golang/mock/gomock"
+	usecases "github.com/int128/kubelogin/usecases"
+	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 usecases.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)
+}
+
+// MockLoginAndExec is a mock of LoginAndExec interface
+type MockLoginAndExec struct {
+	ctrl     *gomock.Controller
+	recorder *MockLoginAndExecMockRecorder
+}
+
+// MockLoginAndExecMockRecorder is the mock recorder for MockLoginAndExec
+type MockLoginAndExecMockRecorder struct {
+	mock *MockLoginAndExec
+}
+
+// NewMockLoginAndExec creates a new mock instance
+func NewMockLoginAndExec(ctrl *gomock.Controller) *MockLoginAndExec {
+	mock := &MockLoginAndExec{ctrl: ctrl}
+	mock.recorder = &MockLoginAndExecMockRecorder{mock}
+	return mock
+}
+
+// EXPECT returns an object that allows the caller to indicate expected use
+func (m *MockLoginAndExec) EXPECT() *MockLoginAndExecMockRecorder {
+	return m.recorder
+}
+
+// Do mocks base method
+func (m *MockLoginAndExec) Do(arg0 context.Context, arg1 usecases.LoginAndExecIn) (*usecases.LoginAndExecOut, error) {
+	ret := m.ctrl.Call(m, "Do", arg0, arg1)
+	ret0, _ := ret[0].(*usecases.LoginAndExecOut)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// Do indicates an expected call of Do
+func (mr *MockLoginAndExecMockRecorder) Do(arg0, arg1 interface{}) *gomock.Call {
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Do", reflect.TypeOf((*MockLoginAndExec)(nil).Do), arg0, arg1)
+}

usecases/usecases.go

@@ -0,0 +1,45 @@
+package usecases
+
+import (
+	"context"
+
+	"github.com/int128/kubelogin/models/kubeconfig"
+)
+
+//go:generate mockgen -destination mock_usecases/mock_usecases.go github.com/int128/kubelogin/usecases Login,LoginAndExec
+
+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
+	KubeconfigContext  kubeconfig.ContextName // Default to the current context but ignored if KubeconfigUser is set
+	KubeconfigUser     kubeconfig.UserName    // Default to the user of the context
+	SkipOpenBrowser    bool
+	ListenPort         []int
+	Username           string // If set, perform the resource owner password credentials grant
+	Password           string // If empty, read a password using Env.ReadPassword()
+	CACertFilename     string // If set, use the CA cert
+	SkipTLSVerify      bool
+}
+
+// LoginShowLocalServerURL provides an interface to notify the URL of local server.
+// It is needed for the end-to-end tests.
+type LoginShowLocalServerURL interface {
+	ShowLocalServerURL(url string)
+}
+
+type LoginAndExec interface {
+	Do(ctx context.Context, in LoginAndExecIn) (*LoginAndExecOut, error)
+}
+
+type LoginAndExecIn struct {
+	LoginIn    LoginIn
+	Executable string
+	Args       []string
+}
+
+type LoginAndExecOut struct {
+	ExitCode int
+}