Migrate to github.com/golang-jwt/jwt/v4 (#604)

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

.circleci/config.yml

@@ -1,19 +0,0 @@
-version: 2.1
-
-jobs:
-  release:
-    macos:
-      # https://circleci.com/docs/2.0/testing-ios/
-      xcode: 11.5.0
-    steps:
-      - checkout
-
-workflows:
-  version: 2
-  build:
-    jobs:
-      - release:
-          context: open-source
-          filters:
-            branches:
-              only: /^dummy.*/

.github/workflows/docker.yaml

@@ -1,16 +1,6 @@
 name: docker
 
 on:
-  push:
-    branches:
-      - master
-    paths:
-      - .github/workflows/docker.yaml
-      - pkg/**
-      - go.*
-      - Dockerfile
-    tags:
-      - v*
   pull_request:
     branches:
       - master
@@ -19,6 +9,18 @@ on:
       - pkg/**
       - go.*
       - Dockerfile
+      - Makefile
+  push:
+    branches:
+      - master
+    paths:
+      - .github/workflows/docker.yaml
+      - pkg/**
+      - go.*
+      - Dockerfile
+      - Makefile
+    tags:
+      - v*
 
 jobs:
   build-and-push:
@@ -27,9 +29,17 @@ jobs:
       - uses: actions/checkout@v2
       - uses: docker/setup-qemu-action@v1
       - uses: docker/setup-buildx-action@v1
+      - uses: actions/cache@v2
+        with:
+          path: /tmp/buildx
+          key: buildx-${{ runner.os }}-${{ github.sha }}
+          restore-keys: |
+            buildx-${{ runner.os }}-
       - uses: docker/login-action@v1
         with:
           registry: ghcr.io
           username: ${{ github.repository_owner }}
-          password: ${{ secrets.CR_PAT }}
-      - run: make docker-build-push
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - uses: int128/buildx-push-action@v1
+        with:
+          extra-args: --platform=linux/amd64,linux/arm64

.github/workflows/go.yaml

@@ -8,6 +8,7 @@ on:
       - .github/workflows/go.yaml
       - pkg/**
       - go.*
+      - Makefile
     tags:
       - v*
   pull_request:
@@ -17,6 +18,7 @@ on:
       - .github/workflows/go.yaml
       - pkg/**
       - go.*
+      - Makefile
 
 jobs:
   lint:
@@ -40,11 +42,38 @@ jobs:
       - uses: actions/cache@v2
         with:
           path: ~/go/pkg/mod
-          key: go-${{ runner.os }}-${{ hashFiles('**/go.sum') }}
+          key: go-linux-amd64-${{ hashFiles('**/go.sum') }}
           restore-keys: |
-            go-${{ runner.os }}-
+            go-linux-amd64-
       - run: go test -v -race -cover -coverprofile=coverage.out ./...
-      - uses: codecov/codecov-action@v1
+      - uses: codecov/codecov-action@v2
+
+  test-platform-dependent:
+    strategy:
+      matrix:
+        platform:
+          - os: windows-latest
+            GOOS: windows
+            GOARCH: amd64
+          - os: macos-latest
+            GOOS: darwin
+            GOARCH: amd64
+    runs-on: ${{ matrix.platform.os }}
+    env:
+      GOOS: ${{ matrix.platform.GOOS }}
+      GOARCH: ${{ matrix.platform.GOARCH }}
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-go@v2
+        with:
+          go-version: 1.16
+      - uses: actions/cache@v2
+        with:
+          path: ~/go/pkg/mod
+          key: go-${{ matrix.platform.GOOS }}-${{ matrix.platform.GOARCH }}-${{ hashFiles('**/go.sum') }}
+          restore-keys: |
+            go-${{ matrix.platform.GOOS }}-${{ matrix.platform.GOARCH }}-
+      - run: go test -race ./...
 
   release:
     strategy:
@@ -53,6 +82,7 @@ jobs:
           - os: ubuntu-latest
             GOOS: linux
             GOARCH: amd64
+            CGO_ENABLED: 0 # https://github.com/int128/kubelogin/issues/567
           - os: ubuntu-latest
             GOOS: linux
             GOARCH: arm64
@@ -62,6 +92,7 @@ jobs:
           - os: macos-latest
             GOOS: darwin
             GOARCH: amd64
+            CGO_ENABLED: 1 # https://github.com/int128/kubelogin/issues/249
           - os: macos-latest
             GOOS: darwin
             GOARCH: arm64
@@ -72,6 +103,7 @@ jobs:
     env:
       GOOS: ${{ matrix.platform.GOOS }}
       GOARCH: ${{ matrix.platform.GOARCH }}
+      CGO_ENABLED: ${{ matrix.platform.CGO_ENABLED }}
     steps:
       - uses: actions/checkout@v2
       - uses: actions/setup-go@v2
@@ -96,4 +128,4 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-      - uses: rajatjindal/krew-release-bot@v0.0.39
+      - uses: rajatjindal/krew-release-bot@v0.0.40

.krew.yaml

@@ -24,39 +24,39 @@ spec:
     You need to setup the OIDC provider, Kubernetes API server, role binding and kubeconfig.
   version: {{ .TagName }}
   platforms:
-    - bin: kubelogin
-      {{ addURIAndSha "https://github.com/int128/kubelogin/releases/download/{{ TagName }}/kubelogin_linux_amd64.zip" .TagName }}
-      selector:
-        matchLabels:
-          os: linux
-          arch: amd64
-    - bin: kubelogin
-      {{ addURIAndSha "https://github.com/int128/kubelogin/releases/download/{{ TagName }}/kubelogin_linux_arm64.zip" .TagName }}
-      selector:
-        matchLabels:
-          os: linux
-          arch: arm64
-    - bin: kubelogin
-      {{ addURIAndSha "https://github.com/int128/kubelogin/releases/download/{{ TagName }}/kubelogin_linux_arm.zip" .TagName }}
-      selector:
-        matchLabels:
-          os: linux
-          arch: arm
-    - bin: kubelogin
-      {{ addURIAndSha "https://github.com/int128/kubelogin/releases/download/{{ TagName }}/kubelogin_darwin_amd64.zip" .TagName }}
-      selector:
-        matchLabels:
-          os: darwin
-          arch: amd64
-    - bin: kubelogin
-      {{ addURIAndSha "https://github.com/int128/kubelogin/releases/download/{{ TagName }}/kubelogin_darwin_arm64.zip" .TagName }}
-      selector:
-        matchLabels:
-          os: darwin
-          arch: arm64
-    - bin: kubelogin
-      {{ addURIAndSha "https://github.com/int128/kubelogin/releases/download/{{ TagName }}/kubelogin_windows_amd64.zip" .TagName }}
-      selector:
-        matchLabels:
-          os: windows
-          arch: amd64
+  - bin: kubelogin
+    {{ addURIAndSha "https://github.com/int128/kubelogin/releases/download/{{ .TagName }}/kubelogin_linux_amd64.zip" .TagName }}
+    selector:
+      matchLabels:
+        os: linux
+        arch: amd64
+  - bin: kubelogin
+    {{ addURIAndSha "https://github.com/int128/kubelogin/releases/download/{{ .TagName }}/kubelogin_linux_arm64.zip" .TagName }}
+    selector:
+      matchLabels:
+        os: linux
+        arch: arm64
+  - bin: kubelogin
+    {{ addURIAndSha "https://github.com/int128/kubelogin/releases/download/{{ .TagName }}/kubelogin_linux_arm.zip" .TagName }}
+    selector:
+      matchLabels:
+        os: linux
+        arch: arm
+  - bin: kubelogin
+    {{ addURIAndSha "https://github.com/int128/kubelogin/releases/download/{{ .TagName }}/kubelogin_darwin_amd64.zip" .TagName }}
+    selector:
+      matchLabels:
+        os: darwin
+        arch: amd64
+  - bin: kubelogin
+    {{ addURIAndSha "https://github.com/int128/kubelogin/releases/download/{{ .TagName }}/kubelogin_darwin_arm64.zip" .TagName }}
+    selector:
+      matchLabels:
+        os: darwin
+        arch: arm64
+  - bin: kubelogin.exe
+    {{ addURIAndSha "https://github.com/int128/kubelogin/releases/download/{{ .TagName }}/kubelogin_windows_amd64.zip" .TagName }}
+    selector:
+      matchLabels:
+        os: windows
+        arch: amd64

Dockerfile

@@ -6,8 +6,7 @@ RUN go mod download
 COPY Makefile .
 COPY main.go .
 COPY pkg pkg
-ARG VERSION
-RUN make VERSION=$VERSION
+RUN make
 
 FROM gcr.io/distroless/base-debian10
 COPY --from=builder /builder/kubelogin /

Makefile

@@ -1,6 +1,12 @@
-TARGET := kubelogin
-TARGET_ARCHIVE := $(TARGET)_$(GOOS)_$(GOARCH).zip
-TARGET_DIGEST := $(TARGET)_$(GOOS)_$(GOARCH).zip.sha256
+PRODUCT := kubelogin
+TARGET_ARCHIVE := $(PRODUCT)_$(GOOS)_$(GOARCH).zip
+TARGET_DIGEST := $(PRODUCT)_$(GOOS)_$(GOARCH).zip.sha256
+
+ifeq ($(GOOS), windows)
+  TARGET := $(PRODUCT).exe
+else
+  TARGET := $(PRODUCT)
+endif
 
 # determine the version from ref
 ifeq ($(GITHUB_REF), refs/heads/master)
@@ -36,18 +42,6 @@ endif
 dist-release: dist
 	gh release upload $(VERSION) $(TARGET_ARCHIVE) $(TARGET_DIGEST) --clobber
 
-DOCKER_REPOSITORY := ghcr.io/int128/kubelogin
-
-.PHONY: docker-build-push
-docker-build-push: Dockerfile
-	docker buildx build . \
-		--build-arg=VERSION=$(VERSION) \
-		--tag=$(DOCKER_REPOSITORY):$(VERSION) \
-		--cache-from=type=registry,ref=$(DOCKER_REPOSITORY):latest \
-		--cache-to=type=inline \
-		--platform=linux/amd64,linux/arm64 \
-		--push
-
 .PHONY: clean
 clean:
 	-rm $(TARGET)

README.md

@@ -1,4 +1,4 @@
-# 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 [![go](https://github.com/int128/kubelogin/actions/workflows/go.yaml/badge.svg)](https://github.com/int128/kubelogin/actions/workflows/go.yaml) [![Go Report Card](https://goreportcard.com/badge/github.com/int128/kubelogin)](https://goreportcard.com/report/github.com/int128/kubelogin)
 
 This is a kubectl plugin for [Kubernetes OpenID Connect (OIDC) authentication](https://kubernetes.io/docs/reference/access-authn-authz/authentication/#openid-connect-tokens), also known as `kubectl oidc-login`.
 
@@ -65,7 +65,7 @@ Kubelogin automatically opens the browser, and you can log in to the provider.
 
 <img src="docs/keycloak-login.png" alt="keycloak-login" width="455" height="329">
 
-After authentication, kubelogin returns the credentials to kubectl and finally kubectl calls the Kubernetes APIs with the credential.
+After authentication, kubelogin returns the credentials to kubectl and kubectl then calls the Kubernetes APIs with these credentials.
 
 ```
 % kubectl get pods
@@ -78,13 +78,13 @@ Kubelogin writes the ID token and refresh token to the token cache file.
 
 If the cached ID token is valid, kubelogin just returns it.
 If the cached ID token has expired, kubelogin will refresh the token using the refresh token.
-If the refresh token has expired, kubelogin will perform reauthentication.
+If the refresh token has expired, kubelogin will perform re-authentication (you will have to login via browser again).
 
 
 ### Troubleshoot
 
 You can log out by removing the token cache directory (default `~/.kube/cache/oidc-login`).
-Kubelogin will perform authentication if the token cache file does not exist.
+Kubelogin will ask you to login via browser again if the token cache file does not exist i.e., it starts with a clean slate
 
 You can dump claims of an ID token by `setup` command.
 
@@ -142,7 +142,7 @@ Your pull request will be merged into master with squash.
 
 ### Development
 
-Go 1.15+ is required.
+Go 1.16+ is required.
 
 ```sh
 make

dist/kubelogin.rb

@@ -1,24 +0,0 @@
-class Kubelogin < Formula
-  desc "A kubectl plugin for Kubernetes OpenID Connect authentication"
-  homepage "https://github.com/int128/kubelogin"
-  version "{{ env "VERSION" }}"
-
-  on_macos do
-    url "https://github.com/int128/kubelogin/releases/download/{{ env "VERSION" }}/kubelogin_darwin_amd64.zip"
-    sha256 "{{ sha256 .darwin_amd64_archive }}"
-  end
-  on_linux do
-    url "https://github.com/int128/kubelogin/releases/download/{{ env "VERSION" }}/kubelogin_linux_amd64.zip"
-    sha256 "{{ sha256 .linux_amd64_archive }}"
-  end
-
-  def install
-    bin.install "kubelogin" => "kubelogin"
-    ln_s bin/"kubelogin", bin/"kubectl-oidc_login"
-  end
-
-  test do
-    system "#{bin}/kubelogin -h"
-    system "#{bin}/kubectl-oidc_login -h"
-  end
-end

docs/setup.md

@@ -129,6 +129,25 @@ You do not need to set `YOUR_CLIENT_SECRET`.
 If you need `groups` claim for access control,
 see [jetstack/okta-kubectl-auth](https://github.com/jetstack/okta-kubectl-auth/blob/master/docs/okta-setup.md) and [#250](https://github.com/int128/kubelogin/issues/250).
 
+### Ping Identity
+
+Login with an account that has permissions to create applications.
+Create an OIDC application with the following configuration:
+
+- Redirect URIs:
+    - `http://localhost:8000`
+    - `http://localhost:18000` (used if the port 8000 is already in use)
+- Grant type: Authorization Code
+- PKCE Enforcement: Required
+
+Leverage the following variables in the next steps.
+
+Variable                | Value
+------------------------|------
+`ISSUER_URL`            | `https://auth.pingone.com/<PingOne Tenant Id>/as`
+`YOUR_CLIENT_ID`        |  random string
+
+`YOUR_CLIENT_SECRET` is not required for this configuration.
 
 ## 2. Verify authentication
 

go.mod

@@ -4,23 +4,22 @@ go 1.16
 
 require (
 	github.com/alexflint/go-filemutex v1.1.0
-	github.com/chromedp/chromedp v0.6.9
+	github.com/chromedp/chromedp v0.7.4
 	github.com/coreos/go-oidc/v3 v3.0.0
-	github.com/dgrijalva/jwt-go v3.2.0+incompatible
-	github.com/golang/mock v1.5.0
-	github.com/google/go-cmp v0.5.5
+	github.com/golang-jwt/jwt/v4 v4.0.0
+	github.com/golang/mock v1.6.0
+	github.com/google/go-cmp v0.5.6
 	github.com/google/wire v0.5.0
 	github.com/int128/oauth2cli v1.13.0
-	github.com/pkg/browser v0.0.0-20210115035449-ce105d075bb4
-	github.com/spf13/cobra v1.1.3
+	github.com/pkg/browser v0.0.0-20210706143420-7d21f8c997e2
+	github.com/spf13/cobra v1.2.1
 	github.com/spf13/pflag v1.0.5
-	golang.org/x/crypto v0.0.0-20201221181555-eec23a3978ad // indirect
-	golang.org/x/net v0.0.0-20210316092652-d523dce5a7f4
-	golang.org/x/oauth2 v0.0.0-20210313182246-cd4f82c27b84
+	golang.org/x/net v0.0.0-20210805182204-aaa1db679c0d
+	golang.org/x/oauth2 v0.0.0-20210805134026-6f1e6394065a
 	golang.org/x/sync v0.0.0-20210220032951-036812b2e83c
-	golang.org/x/term v0.0.0-20210317153231-de623e64d2a6
+	golang.org/x/term v0.0.0-20210615171337-6886f2dfbf5b
 	gopkg.in/yaml.v2 v2.4.0
-	k8s.io/apimachinery v0.20.5
-	k8s.io/client-go v0.20.5
-	k8s.io/klog/v2 v2.8.0
+	k8s.io/apimachinery v0.22.0
+	k8s.io/client-go v0.22.0
+	k8s.io/klog/v2 v2.10.0
 )

go.sum

@@ -13,6 +13,11 @@ cloud.google.com/go v0.56.0/go.mod h1:jr7tqZxxKOVYizybht9+26Z/gUq7tiRzu+ACVAMbKV
 cloud.google.com/go v0.57.0/go.mod h1:oXiQ6Rzq3RAkkY7N6t3TcE6jE+CIBBbA36lwQ1JyzZs=
 cloud.google.com/go v0.62.0/go.mod h1:jmCYTdRCQuc1PHIIJ/maLInMho30T/Y0M4hTdTShOYc=
 cloud.google.com/go v0.65.0/go.mod h1:O5N8zS7uWy9vkA9vayVHs65eM1ubvY4h553ofrNHObY=
+cloud.google.com/go v0.72.0/go.mod h1:M+5Vjvlc2wnp6tjzE102Dw08nGShTscUx2nZMufOKPI=
+cloud.google.com/go v0.74.0/go.mod h1:VV1xSbzvo+9QJOxLDaJfTjx5e+MePCpCWwvftOeQmWk=
+cloud.google.com/go v0.78.0/go.mod h1:QjdrLG0uq+YwhjoVOLsS1t7TW8fs36kLs4XO5R5ECHg=
+cloud.google.com/go v0.79.0/go.mod h1:3bzgcEeQlzbuEAYu4mrWhKqWjmpprinYgKJLgKHnbb8=
+cloud.google.com/go v0.81.0/go.mod h1:mk/AM35KwGk/Nm2YSeZbxXdrNK3KZOYHmLkOqC2V6E0=
 cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o=
 cloud.google.com/go/bigquery v1.3.0/go.mod h1:PjpwJnslEMmckchkHFfq+HTD2DmtT67aNFKH1/VBDHE=
 cloud.google.com/go/bigquery v1.4.0/go.mod h1:S8dzgnTigyfTmLBfrtrhyYhwRxG72rYxvftPBK2Dvzc=
@@ -33,38 +38,31 @@ cloud.google.com/go/storage v1.8.0/go.mod h1:Wv1Oy7z6Yz3DshWRJFhqM/UCfaWIRTdp0RX
 cloud.google.com/go/storage v1.10.0/go.mod h1:FLPqc6j+Ki4BU591ie1oL6qBQGu2Bl/tZ9ullr3+Kg0=
 dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
 github.com/Azure/go-autorest v14.2.0+incompatible/go.mod h1:r+4oMnoxhatjLLJ6zxSWATqVooLgysK6ZNox3g/xq24=
-github.com/Azure/go-autorest/autorest v0.11.1/go.mod h1:JFgpikqFJ/MleTTxwepExTKnFUKKszPS8UavbQYUMuw=
-github.com/Azure/go-autorest/autorest/adal v0.9.0/go.mod h1:/c022QCutn2P7uY+/oQWWNcK9YU+MH96NgK+jErpbcg=
-github.com/Azure/go-autorest/autorest/adal v0.9.5/go.mod h1:B7KF7jKIeC9Mct5spmyCB/A8CG/sEz1vwIRGv/bbw7A=
+github.com/Azure/go-autorest/autorest v0.11.18/go.mod h1:dSiJPy22c3u0OtOKDNttNgqpNFY/GeWa7GH/Pz56QRA=
+github.com/Azure/go-autorest/autorest/adal v0.9.13/go.mod h1:W/MM4U6nLxnIskrw4UwWzlHfGjwUS50aOsc/I3yuU8M=
 github.com/Azure/go-autorest/autorest/date v0.3.0/go.mod h1:BI0uouVdmngYNUzGWeSYnokU+TrmwEsOqdt8Y6sso74=
-github.com/Azure/go-autorest/autorest/mocks v0.4.0/go.mod h1:LTp+uSrOhSkaKrUy935gNZuuIPPVsHlr9DSOxSayd+k=
 github.com/Azure/go-autorest/autorest/mocks v0.4.1/go.mod h1:LTp+uSrOhSkaKrUy935gNZuuIPPVsHlr9DSOxSayd+k=
-github.com/Azure/go-autorest/logger v0.2.0/go.mod h1:T9E3cAhj2VqvPOtCYAvby9aBXkZmbF5NWuPV8+WeEW8=
+github.com/Azure/go-autorest/logger v0.2.1/go.mod h1:T9E3cAhj2VqvPOtCYAvby9aBXkZmbF5NWuPV8+WeEW8=
 github.com/Azure/go-autorest/tracing v0.6.0/go.mod h1:+vhtPC754Xsa23ID7GlGsrdKBpUA79WCAKPPZVC2DeU=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
 github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
 github.com/NYTimes/gziphandler v0.0.0-20170623195520-56545f4a5d46/go.mod h1:3wb06e3pkSAbeQ52E9H9iFoQsEEwGN64994WTCIhntQ=
-github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=
 github.com/PuerkitoBio/purell v1.1.1/go.mod h1:c11w/QuzBsJSee3cPx9rAFu61PvFxuPbtSwDGJws/X0=
 github.com/PuerkitoBio/urlesc v0.0.0-20170810143723-de5bf2ad4578/go.mod h1:uGdkoq3SwY9Y+13GIhn11/XLaGBb4BfwItxLd5jeuXE=
-github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
-github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
 github.com/alexflint/go-filemutex v1.1.0 h1:IAWuUuRYL2hETx5b8vCgwnD+xSdlsTQY6s2JjBsqLdg=
 github.com/alexflint/go-filemutex v1.1.0/go.mod h1:7P4iRhttt/nUvUOrYIhcpMzv2G6CY9UnI16Z+UJqRyk=
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@@ -141,8 +130,9 @@ github.com/golang/mock v1.4.0/go.mod h1:UOMv5ysSaYNkG+OFQykRIcU/QvvxJf3p21QfJ2Bt
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@@ -156,10 +146,14 @@ github.com/golang/protobuf v1.4.0-rc.4.0.20200313231945-b860323f09d0/go.mod h1:W
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@@ -168,13 +162,17 @@ github.com/google/go-cmp v0.4.1/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/
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@@ -182,6 +180,10 @@ github.com/google/pprof v0.0.0-20200212024743-f11f1df84d12/go.mod h1:ZgVRPoUq/hf
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@@ -190,13 +192,12 @@ github.com/google/wire v0.5.0 h1:I7ELFeVBr3yfPIcc8+MWvrjk+3VjbcSzoXm3JVa+jD8=
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@@ -219,6 +220,7 @@ github.com/hashicorp/memberlist v0.1.3/go.mod h1:ajVTdAv/9Im8oMAAj5G31PhhMCZJV2p
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@@ -227,45 +229,40 @@ github.com/int128/listener v1.1.0 h1:2Jb41DWLpkQ3I9bIdBzO8H/tNwMvyl/OBZWtCV5Pjuw
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@@ -382,6 +374,8 @@ golang.org/x/lint v0.0.0-20190930215403-16217165b5de/go.mod h1:6SW0HCj/g11FgYtHl
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@@ -390,13 +384,14 @@ golang.org/x/mod v0.1.1-0.20191105210325-c90efee705ee/go.mod h1:QqPTAvyqsEbceGzB
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@@ -404,7 +399,6 @@ golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn
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@@ -420,20 +414,36 @@ golang.org/x/net v0.0.0-20200501053045-e0ff5e5a1de5/go.mod h1:qpuaurCH72eLCgpAm/
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@@ -514,7 +540,6 @@ golang.org/x/tools v0.0.0-20190425150028-36563e24a262/go.mod h1:RgjU9mgBXZiqYHBn
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@@ -543,9 +568,19 @@ golang.org/x/tools v0.0.0-20200501065659-ab2804fb9c9d/go.mod h1:EkVYQZoAsY45+roY
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@@ -567,13 +602,20 @@ google.golang.org/api v0.24.0/go.mod h1:lIXQywCXRcnZPGlsd8NbLnOjtAoL6em04bJ9+z0M
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@@ -597,12 +639,25 @@ google.golang.org/genproto v0.0.0-20200312145019-da6875a35672/go.mod h1:55QSHmfG
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@@ -615,6 +670,14 @@ google.golang.org/grpc v1.28.0/go.mod h1:rpkK4SK4GF4Ach/+MFLZUBavHOvF2JJB5uozKKa
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+google.golang.org/grpc v1.31.1/go.mod h1:N36X2cJ7JwdamYAgDz+s+rVMFjt3numwzf/HckM8pak=
+google.golang.org/grpc v1.33.1/go.mod h1:fr5YgcSWrqhRRxogOsw7RzIpsmvOZ6IcH4kBYTpR3n0=
+google.golang.org/grpc v1.33.2/go.mod h1:JMHMWHQWaTccqQQlmk3MJZS+GWXOdAesneDmEnv2fbc=
+google.golang.org/grpc v1.34.0/go.mod h1:WotjhfgOW/POjDeRt8vscBtXq+2VjORFy659qA51WJ8=
+google.golang.org/grpc v1.35.0/go.mod h1:qjiiYl8FncCW8feJPdyg3v6XW24KsRHe+dy9BAGRRjU=
+google.golang.org/grpc v1.36.0/go.mod h1:qjiiYl8FncCW8feJPdyg3v6XW24KsRHe+dy9BAGRRjU=
+google.golang.org/grpc v1.36.1/go.mod h1:qjiiYl8FncCW8feJPdyg3v6XW24KsRHe+dy9BAGRRjU=
+google.golang.org/grpc v1.38.0/go.mod h1:NREThFqKR1f3iQ6oBuvc5LadQuXVGo9rkm5ZGrQdJfM=
 google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
 google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
 google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM=
@@ -624,31 +687,35 @@ google.golang.org/protobuf v1.22.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2
 google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
 google.golang.org/protobuf v1.23.1-0.20200526195155-81db48ad09cc/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
 google.golang.org/protobuf v1.24.0/go.mod h1:r/3tXBNzIEhYS9I1OUVjXDlt8tc493IdKGjtUeSXeh4=
-google.golang.org/protobuf v1.25.0 h1:Ejskq+SyPohKW+1uil0JJMtmHCgJPJ/qWTxr8qp+R4c=
 google.golang.org/protobuf v1.25.0/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlbajtzgsN7c=
-gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
+google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
+google.golang.org/protobuf v1.26.0 h1:bxAC2xTBsZGibn2RTntX0oH50xLsqy1OxA9tTL3p/lk=
+google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 h1:YR8cESwS4TdDjEe65xsg0ogRM/Nc3DYOhEAlW+xobZo=
 gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f h1:BLraFXnmrev5lT+xlilqcH8XK9/i0At2xKjWk4p6zsU=
+gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
 gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
 gopkg.in/inf.v0 v0.9.1 h1:73M5CoZyi3ZLMOyDlQh031Cx6N9NDJ2Vvfl76EDAgDc=
 gopkg.in/inf.v0 v0.9.1/go.mod h1:cWUDdTG/fYaXco+Dcufb5Vnc6Gp2YChqWtbxRZE0mXw=
-gopkg.in/ini.v1 v1.51.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
-gopkg.in/resty.v1 v1.12.0/go.mod h1:mDo4pnntr5jdWRML875a/NmxYqAlA73dVijT2AXvQQo=
+gopkg.in/ini.v1 v1.62.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
 gopkg.in/square/go-jose.v2 v2.5.1 h1:7odma5RETjNHWJnR32wx8t+Io4djHE1PqxCFx3iiZ2w=
 gopkg.in/square/go-jose.v2 v2.5.1/go.mod h1:M9dMgbHiYLoDGQrXy7OpJDJWiKiU//h+vD76mk0e1AI=
 gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
-gopkg.in/yaml.v2 v2.0.0-20170812160011-eb3733d160e7/go.mod h1:JAlM8MvJe8wmxCU4Bli9HhUf9+ttbYbLASfIpnQbh74=
 gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.3/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
 gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
-gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v3 v3.0.0-20200615113413-eeeca48fe776/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b h1:h8qDotaEPuJATrMmW04NCwg7v22aHH28wwpauUhK9Oo=
+gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190418001031-e561f6794a2a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
@@ -656,25 +723,25 @@ honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWh
 honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
 honnef.co/go/tools v0.0.1-2020.1.3/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
 honnef.co/go/tools v0.0.1-2020.1.4/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
-k8s.io/api v0.20.5 h1:zsMTffV0Le2EiI0aKvlTHEnXGxk1HiqGRhJcCPiI7JI=
-k8s.io/api v0.20.5/go.mod h1:FQjAceXnVaWDeov2YUWhOb6Yt+5UjErkp6UO3nczO1Y=
-k8s.io/apimachinery v0.20.5 h1:wO/FxMVRn223rAKxnBbwCyuN96bS9MFTIvP0e/V7cps=
-k8s.io/apimachinery v0.20.5/go.mod h1:WlLqWAHZGg07AeltaI0MV5uk1Omp8xaN0JGLY6gkRpU=
-k8s.io/client-go v0.20.5 h1:dJGtYUvFrFGjQ+GjXEIby0gZWdlAOc0xJBJqY3VyDxA=
-k8s.io/client-go v0.20.5/go.mod h1:Ee5OOMMYvlH8FCZhDsacjMlCBwetbGZETwo1OA+e6Zw=
+k8s.io/api v0.22.0 h1:elCpMZ9UE8dLdYxr55E06TmSeji9I3KH494qH70/y+c=
+k8s.io/api v0.22.0/go.mod h1:0AoXXqst47OI/L0oGKq9DG61dvGRPXs7X4/B7KyjBCU=
+k8s.io/apimachinery v0.22.0 h1:CqH/BdNAzZl+sr3tc0D3VsK3u6ARVSo3GWyLmfIjbP0=
+k8s.io/apimachinery v0.22.0/go.mod h1:O3oNtNadZdeOMxHFVxOreoznohCpy0z6mocxbZr7oJ0=
+k8s.io/client-go v0.22.0 h1:sD6o9O6tCwUKCENw8v+HFsuAbq2jCu8cWC61/ydwA50=
+k8s.io/client-go v0.22.0/go.mod h1:GUjIuXR5PiEv/RVK5OODUsm6eZk7wtSWZSaSJbpFdGg=
 k8s.io/gengo v0.0.0-20200413195148-3a45101e95ac/go.mod h1:ezvh/TsK7cY6rbqRK0oQQ8IAqLxYwwyPxAX1Pzy0ii0=
 k8s.io/klog/v2 v2.0.0/go.mod h1:PBfzABfn139FHAV07az/IF9Wp1bkk3vpT2XSJ76fSDE=
-k8s.io/klog/v2 v2.4.0/go.mod h1:Od+F08eJP+W3HUb4pSrPpgp9DGU4GzlpG/TmITuYh/Y=
-k8s.io/klog/v2 v2.8.0 h1:Q3gmuM9hKEjefWFFYF0Mat+YyFJvsUyYuwyNNJ5C9Ts=
-k8s.io/klog/v2 v2.8.0/go.mod h1:hy9LJ/NvuK+iVyP4Ehqva4HxZG/oXyIS3n3Jmire4Ec=
-k8s.io/kube-openapi v0.0.0-20201113171705-d219536bb9fd/go.mod h1:WOJ3KddDSol4tAGcJo0Tvi+dK12EcqSLqcWsryKMpfM=
-k8s.io/utils v0.0.0-20201110183641-67b214c5f920 h1:CbnUZsM497iRC5QMVkHwyl8s2tB3g7yaSHkYPkpgelw=
-k8s.io/utils v0.0.0-20201110183641-67b214c5f920/go.mod h1:jPW/WVKK9YHAvNhRxK0md/EJ228hCsBRufyofKtW8HA=
+k8s.io/klog/v2 v2.9.0/go.mod h1:hy9LJ/NvuK+iVyP4Ehqva4HxZG/oXyIS3n3Jmire4Ec=
+k8s.io/klog/v2 v2.10.0 h1:R2HDMDJsHVTHA2n4RjwbeYXdOcBymXdX/JRb1v0VGhE=
+k8s.io/klog/v2 v2.10.0/go.mod h1:hy9LJ/NvuK+iVyP4Ehqva4HxZG/oXyIS3n3Jmire4Ec=
+k8s.io/kube-openapi v0.0.0-20210421082810-95288971da7e/go.mod h1:vHXdDvt9+2spS2Rx9ql3I8tycm3H9FDfdUoIuKCefvw=
+k8s.io/utils v0.0.0-20210707171843-4b05e18ac7d9 h1:imL9YgXQ9p7xmPzHFm/vVd/cF78jad+n4wK1ABwYtMM=
+k8s.io/utils v0.0.0-20210707171843-4b05e18ac7d9/go.mod h1:jPW/WVKK9YHAvNhRxK0md/EJ228hCsBRufyofKtW8HA=
 rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
 rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
 rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=
-sigs.k8s.io/structured-merge-diff/v4 v4.0.2 h1:YHQV7Dajm86OuqnIR6zAelnDWBRjo+YhYV9PmGrh1s8=
 sigs.k8s.io/structured-merge-diff/v4 v4.0.2/go.mod h1:bJZC9H9iH24zzfZ/41RGcq60oK1F7G282QMXDPYydCw=
-sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o=
+sigs.k8s.io/structured-merge-diff/v4 v4.1.2 h1:Hr/htKFmJEbtMgS/UD0N+gtgctAqz81t3nu+sPzynno=
+sigs.k8s.io/structured-merge-diff/v4 v4.1.2/go.mod h1:j/nl6xW8vLS49O8YvXW1ocPhZawJtm+Yrr7PPRQ0Vg4=
 sigs.k8s.io/yaml v1.2.0 h1:kr/MCeFWJWTwyaHoR9c8EjH9OumOmoF9YGiZd7lFm/Q=
 sigs.k8s.io/yaml v1.2.0/go.mod h1:yfXDCHCao9+ENCvLSE62v9VSji2MKu5jeNfTrofGhJc=

pkg/cmd/authentication.go

@@ -67,17 +67,9 @@ func (o *authenticationOptions) addFlags(f *pflag.FlagSet) {
 	f.StringVar(&o.Password, "password", "", "[password] Password for resource owner password credentials grant")
 }
 
-func (o *authenticationOptions) expandHomedir() error {
-	var err error
-	o.LocalServerCertFile, err = expandHomedir(o.LocalServerCertFile)
-	if err != nil {
-		return fmt.Errorf("invalid --local-server-cert: %w", err)
-	}
-	o.LocalServerKeyFile, err = expandHomedir(o.LocalServerKeyFile)
-	if err != nil {
-		return fmt.Errorf("invalid --local-server-key: %w", err)
-	}
-	return nil
+func (o *authenticationOptions) expandHomedir() {
+	o.LocalServerCertFile = expandHomedir(o.LocalServerCertFile)
+	o.LocalServerKeyFile = expandHomedir(o.LocalServerKeyFile)
 }
 
 func (o *authenticationOptions) grantOptionSet() (s authentication.GrantOptionSet, err error) {

pkg/cmd/cmd.go

@@ -2,6 +2,7 @@ package cmd
 
 import (
 	"context"
+	"path/filepath"
 	"runtime"
 
 	"github.com/google/wire"
@@ -23,7 +24,7 @@ type Interface interface {
 }
 
 var defaultListenAddress = []string{"127.0.0.1:8000", "127.0.0.1:18000"}
-var defaultTokenCacheDir = "~/.kube/cache/oidc-login"
+var defaultTokenCacheDir = filepath.Join("~", ".kube", "cache", "oidc-login")
 
 const defaultAuthenticationTimeoutSec = 180
 

pkg/cmd/cmd_test.go

@@ -3,6 +3,7 @@ package cmd
 import (
 	"context"
 	"os"
+	"path/filepath"
 	"testing"
 	"time"
 
@@ -116,7 +117,7 @@ func TestCmd_Run(t *testing.T) {
 					"--oidc-client-id", "YOUR_CLIENT_ID",
 				},
 				in: credentialplugin.Input{
-					TokenCacheDir: userHomeDir + "/.kube/cache/oidc-login",
+					TokenCacheDir: filepath.Join(userHomeDir, ".kube/cache/oidc-login"),
 					Provider: oidc.Provider{
 						IssuerURL: "https://issuer.example.com",
 						ClientID:  "YOUR_CLIENT_ID",
@@ -141,7 +142,7 @@ func TestCmd_Run(t *testing.T) {
 					"-v1",
 				},
 				in: credentialplugin.Input{
-					TokenCacheDir: userHomeDir + "/.kube/cache/oidc-login",
+					TokenCacheDir: filepath.Join(userHomeDir, ".kube/cache/oidc-login"),
 					Provider: oidc.Provider{
 						IssuerURL:    "https://issuer.example.com",
 						ClientID:     "YOUR_CLIENT_ID",
@@ -168,7 +169,7 @@ func TestCmd_Run(t *testing.T) {
 					"--token-cache-dir", "~/.kube/oidc-cache",
 				},
 				in: credentialplugin.Input{
-					TokenCacheDir: userHomeDir + "/.kube/oidc-cache",
+					TokenCacheDir: filepath.Join(userHomeDir, ".kube/oidc-cache"),
 					Provider: oidc.Provider{
 						IssuerURL: "https://issuer.example.com",
 						ClientID:  "YOUR_CLIENT_ID",
@@ -178,12 +179,12 @@ func TestCmd_Run(t *testing.T) {
 							BindAddress:           defaultListenAddress,
 							AuthenticationTimeout: defaultAuthenticationTimeoutSec * time.Second,
 							RedirectURLHostname:   "localhost",
-							LocalServerCertFile:   userHomeDir + "/.kube/oidc-server.crt",
-							LocalServerKeyFile:    userHomeDir + "/.kube/oidc-server.key",
+							LocalServerCertFile:   filepath.Join(userHomeDir, ".kube/oidc-server.crt"),
+							LocalServerKeyFile:    filepath.Join(userHomeDir, ".kube/oidc-server.key"),
 						},
 					},
 					TLSClientConfig: tlsclientconfig.Config{
-						CACertFilename: []string{userHomeDir + "/.kube/ca.crt"},
+						CACertFilename: []string{filepath.Join(userHomeDir, ".kube/ca.crt")},
 					},
 				},
 			},

pkg/cmd/get_token.go

@@ -3,8 +3,6 @@ package cmd
 import (
 	"errors"
 	"fmt"
-	"os"
-	"strings"
 
 	"github.com/int128/kubelogin/pkg/infrastructure/logger"
 	"github.com/int128/kubelogin/pkg/oidc"
@@ -19,6 +17,7 @@ type getTokenOptions struct {
 	ClientID              string
 	ClientSecret          string
 	ExtraScopes           []string
+	UsePKCE               bool
 	TokenCacheDir         string
 	tlsOptions            tlsOptions
 	authenticationOptions authenticationOptions
@@ -29,23 +28,16 @@ func (o *getTokenOptions) addFlags(f *pflag.FlagSet) {
 	f.StringVar(&o.ClientID, "oidc-client-id", "", "Client ID of the provider (mandatory)")
 	f.StringVar(&o.ClientSecret, "oidc-client-secret", "", "Client secret of the provider")
 	f.StringSliceVar(&o.ExtraScopes, "oidc-extra-scope", nil, "Scopes to request to the provider")
+	f.BoolVar(&o.UsePKCE, "oidc-use-pkce", false, "Force PKCE usage")
 	f.StringVar(&o.TokenCacheDir, "token-cache-dir", defaultTokenCacheDir, "Path to a directory for token cache")
 	o.tlsOptions.addFlags(f)
 	o.authenticationOptions.addFlags(f)
 }
 
 func (o *getTokenOptions) expandHomedir() error {
-	var err error
-	o.TokenCacheDir, err = expandHomedir(o.TokenCacheDir)
-	if err != nil {
-		return fmt.Errorf("invalid --token-cache-dir: %w", err)
-	}
-	if err = o.authenticationOptions.expandHomedir(); err != nil {
-		return err
-	}
-	if err = o.tlsOptions.expandHomedir(); err != nil {
-		return err
-	}
+	o.TokenCacheDir = expandHomedir(o.TokenCacheDir)
+	o.authenticationOptions.expandHomedir()
+	o.tlsOptions.expandHomedir()
 	return nil
 }
 
@@ -84,6 +76,7 @@ func (cmd *GetToken) New() *cobra.Command {
 					IssuerURL:    o.IssuerURL,
 					ClientID:     o.ClientID,
 					ClientSecret: o.ClientSecret,
+					UsePKCE:      o.UsePKCE,
 					ExtraScopes:  o.ExtraScopes,
 				},
 				TokenCacheDir:   o.TokenCacheDir,
@@ -100,14 +93,3 @@ func (cmd *GetToken) New() *cobra.Command {
 	o.addFlags(c.Flags())
 	return c
 }
-
-func expandHomedir(s string) (string, error) {
-	if !strings.HasPrefix(s, "~"+string(os.PathSeparator)) {
-		return s, nil
-	}
-	userHomeDir, err := os.UserHomeDir()
-	if err != nil {
-		return "", fmt.Errorf("could not expand homedir: %w", err)
-	}
-	return userHomeDir + strings.TrimPrefix(s, "~"), nil
-}

pkg/cmd/homedir.go

@@ -0,0 +1,15 @@
+package cmd
+
+import (
+	"path/filepath"
+	"strings"
+
+	"k8s.io/client-go/util/homedir"
+)
+
+func expandHomedir(s string) string {
+	if !strings.HasPrefix(s, "~") {
+		return s
+	}
+	return filepath.Join(homedir.HomeDir(), strings.TrimPrefix(s, "~"))
+}

pkg/cmd/setup.go

@@ -2,6 +2,7 @@ package cmd
 
 import (
 	"fmt"
+
 	"github.com/int128/kubelogin/pkg/usecases/setup"
 	"github.com/spf13/cobra"
 	"github.com/spf13/pflag"
@@ -13,6 +14,7 @@ type setupOptions struct {
 	ClientID              string
 	ClientSecret          string
 	ExtraScopes           []string
+	UsePKCE               bool
 	tlsOptions            tlsOptions
 	authenticationOptions authenticationOptions
 }
@@ -22,6 +24,7 @@ func (o *setupOptions) addFlags(f *pflag.FlagSet) {
 	f.StringVar(&o.ClientID, "oidc-client-id", "", "Client ID of the provider")
 	f.StringVar(&o.ClientSecret, "oidc-client-secret", "", "Client secret of the provider")
 	f.StringSliceVar(&o.ExtraScopes, "oidc-extra-scope", nil, "Scopes to request to the provider")
+	f.BoolVar(&o.UsePKCE, "oidc-use-pkce", false, "Force PKCE usage")
 	o.tlsOptions.addFlags(f)
 	o.authenticationOptions.addFlags(f)
 }
@@ -46,6 +49,7 @@ func (cmd *Setup) New() *cobra.Command {
 				ClientID:        o.ClientID,
 				ClientSecret:    o.ClientSecret,
 				ExtraScopes:     o.ExtraScopes,
+				UsePKCE:         o.UsePKCE,
 				GrantOptionSet:  grantOptionSet,
 				TLSClientConfig: o.tlsOptions.tlsClientConfig(),
 			}

pkg/cmd/tls.go

@@ -2,7 +2,6 @@ package cmd
 
 import (
 	"crypto/tls"
-	"fmt"
 
 	"github.com/int128/kubelogin/pkg/tlsclientconfig"
 	"github.com/spf13/pflag"
@@ -24,17 +23,13 @@ func (o *tlsOptions) addFlags(f *pflag.FlagSet) {
 	f.BoolVar(&o.RenegotiateFreelyAsClient, "tls-renegotiation-freely", false, "If set, allow a remote server to repeatedly request renegotiation")
 }
 
-func (o *tlsOptions) expandHomedir() error {
+func (o *tlsOptions) expandHomedir() {
 	var caCertFilenames []string
 	for _, caCertFilename := range o.CACertFilename {
-		expanded, err := expandHomedir(caCertFilename)
-		if err != nil {
-			return fmt.Errorf("invalid --certificate-authority: %w", err)
-		}
+		expanded := expandHomedir(caCertFilename)
 		caCertFilenames = append(caCertFilenames, expanded)
 	}
 	o.CACertFilename = caCertFilenames
-	return nil
 }
 
 func (o tlsOptions) tlsClientConfig() tlsclientconfig.Config {

pkg/oidc/client/factory.go

@@ -12,6 +12,7 @@ import (
 	"github.com/int128/kubelogin/pkg/infrastructure/logger"
 	"github.com/int128/kubelogin/pkg/oidc"
 	"github.com/int128/kubelogin/pkg/oidc/client/logging"
+	"github.com/int128/kubelogin/pkg/pkce"
 	"github.com/int128/kubelogin/pkg/tlsclientconfig"
 	"github.com/int128/kubelogin/pkg/tlsclientconfig/loader"
 	"golang.org/x/oauth2"
@@ -61,6 +62,9 @@ func (f *Factory) New(ctx context.Context, p oidc.Provider, tlsClientConfig tlsc
 	if err != nil {
 		return nil, fmt.Errorf("could not determine supported PKCE methods: %w", err)
 	}
+	if len(supportedPKCEMethods) == 0 && p.UsePKCE {
+		supportedPKCEMethods = []string{pkce.MethodS256}
+	}
 	return &client{
 		httpClient: httpClient,
 		provider:   provider,

pkg/oidc/oidc.go

@@ -15,6 +15,7 @@ type Provider struct {
 	ClientID     string
 	ClientSecret string   // optional
 	ExtraScopes  []string // optional
+	UsePKCE      bool     // optional
 }
 
 // TokenSet represents a set of ID token and refresh token.

pkg/pkce/pkce.go

@@ -14,7 +14,7 @@ var Plain Params
 
 const (
 	// code challenge methods defined as https://tools.ietf.org/html/rfc7636#section-4.3
-	methodS256 = "S256"
+	MethodS256 = "S256"
 )
 
 // Params represents a set of the PKCE parameters.
@@ -33,7 +33,7 @@ func (p Params) IsZero() bool {
 // It returns Plain if no method is available.
 func New(methods []string) (Params, error) {
 	for _, method := range methods {
-		if method == methodS256 {
+		if method == MethodS256 {
 			return NewS256()
 		}
 	}
@@ -63,7 +63,7 @@ func computeS256(b []byte) Params {
 	_, _ = s.Write([]byte(v))
 	return Params{
 		CodeChallenge:       base64URLEncode(s.Sum(nil)),
-		CodeChallengeMethod: methodS256,
+		CodeChallengeMethod: MethodS256,
 		CodeVerifier:        v,
 	}
 }

pkg/testing/jwt/encode.go

@@ -5,7 +5,7 @@ import (
 	"crypto/rsa"
 	"testing"
 
-	"github.com/dgrijalva/jwt-go"
+	"github.com/golang-jwt/jwt/v4"
 )
 
 var PrivateKey = generateKey(1024)

pkg/usecases/setup/stage2.go

@@ -73,6 +73,7 @@ type Stage2Input struct {
 	ClientID          string
 	ClientSecret      string
 	ExtraScopes       []string // optional
+	UsePKCE           bool     // optional
 	ListenAddressArgs []string // non-nil if set by the command arg
 	GrantOptionSet    authentication.GrantOptionSet
 	TLSClientConfig   tlsclientconfig.Config
@@ -86,6 +87,7 @@ func (u *Setup) DoStage2(ctx context.Context, in Stage2Input) error {
 			ClientID:     in.ClientID,
 			ClientSecret: in.ClientSecret,
 			ExtraScopes:  in.ExtraScopes,
+			UsePKCE:      in.UsePKCE,
 		},
 		GrantOptionSet:  in.GrantOptionSet,
 		TLSClientConfig: in.TLSClientConfig,
@@ -123,6 +125,9 @@ func makeCredentialPluginArgs(in Stage2Input) []string {
 	for _, extraScope := range in.ExtraScopes {
 		args = append(args, "--oidc-extra-scope="+extraScope)
 	}
+	if in.UsePKCE {
+		args = append(args, "--oidc-use-pkce")
+	}
 	for _, f := range in.TLSClientConfig.CACertFilename {
 		args = append(args, "--certificate-authority="+f)
 	}