Add output of client certificate

Co-authored-by: Fernandez Ludovic <ldez@users.noreply.github.com>

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -0,0 +1,72 @@
+name: Bug Report
+description: Create a report to help us improve.
+body:
+  - type: checkboxes
+    id: terms
+    attributes:
+      label: Welcome!
+      description: |
+        The issue tracker is for reporting bugs and feature requests only.
+
+        All new/updated issues are triaged regularly by the maintainers.
+        All issues closed by a bot are subsequently double-checked by the maintainers.
+
+        DO NOT FILE ISSUES FOR GENERAL SUPPORT QUESTIONS.
+
+      options:
+        - label: Yes, I've searched similar issues on [GitHub](https://github.com/traefik/whoami/issues) and didn't find any.
+          required: true
+
+  - type: textarea
+    attributes:
+      label: What did you do?
+      description: |
+        How to write a good bug report?
+
+        - Respect the issue template as much as possible.
+        - The title should be short and descriptive.
+        - Explain the conditions which led you to report this issue: the context.
+        - The context should lead to something, an idea or a problem that you’re facing.
+        - Remain clear and concise.
+        - Format your messages to help the reader focus on what matters and understand the structure of your message, use [Markdown syntax](https://help.github.com/articles/github-flavored-markdown)
+      placeholder: What did you do?
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: What were you expecting?
+      placeholder: What were you expecting?
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: What version are you using?
+      description: |
+        `latest` is not considered as a valid version.
+      placeholder: Paste your output here.
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: What is your environment & configuration?
+      description: arguments, toml, provider, platform, ...
+      placeholder: Add information here.
+      value: |
+        ```yaml
+        # (paste your configuration here)
+        ```
+
+        Add more configuration information here.
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: If applicable, please paste the log output in DEBUG level
+      description: "`--log.level=DEBUG` switch."
+      placeholder: Paste your output here.
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,5 @@
+blank_issues_enabled: false
+contact_links:
+  - name: Traefik Community Support
+    url: https://community.traefik.io/
+    about: If you have a question, or are looking for advice, please post on our Discuss forum! The community loves to chime in to help. Happy Coding!

.github/ISSUE_TEMPLATE/feature_request.yml

@@ -0,0 +1,30 @@
+name: Feature Request
+description: Suggest an idea for this project.
+body:
+  - type: checkboxes
+    id: terms
+    attributes:
+      label: Welcome!
+      description: |
+        The issue tracker is for reporting bugs and feature requests only.
+
+        DO NOT FILE ISSUES FOR GENERAL SUPPORT QUESTIONS.
+      options:
+        - label: Yes, I've searched similar issues on [GitHub](https://github.com/traefik/whoami/issues) and didn't find any.
+          required: true
+
+  - type: textarea
+    attributes:
+      label: What did you expect to see?
+      description: |
+        How to write a good issue?
+
+        - Respect the issue template as much as possible.
+        - The title should be short and descriptive.
+        - Explain the conditions which led you to report this issue: the context.
+        - The context should lead to something, an idea or a problem that you’re facing.
+        - Remain clear and concise.
+        - Format your messages to help the reader focus on what matters and understand the structure of your message, use [Markdown syntax](https://help.github.com/articles/github-flavored-markdown)
+      placeholder: What did you expect to see?
+    validations:
+      required: true

.github/workflows/ci.yml

@@ -12,21 +12,21 @@ jobs:
     name: Main Process
     runs-on: ubuntu-latest
     env:
-      GO_VERSION: '1.20'
-      GOLANGCI_LINT_VERSION: v1.53.3
+      GO_VERSION: stable
+      GOLANGCI_LINT_VERSION: v1.63.4
       CGO_ENABLED: 0
 
     steps:
 
       # https://github.com/marketplace/actions/checkout
       - name: Check out code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
       # https://github.com/marketplace/actions/setup-go-environment
       - name: Set up Go ${{ env.GO_VERSION }}
-        uses: actions/setup-go@v4
+        uses: actions/setup-go@v5
         with:
           go-version: ${{ env.GO_VERSION }}
 

.github/workflows/go-cross.yml

@@ -15,17 +15,17 @@ jobs:
 
     strategy:
       matrix:
-        go-version: [ 1.19, 1.x ]
+        go-version: [ stable, oldstable ]
         os: [ubuntu-latest, macos-latest, windows-latest]
 
     steps:
       # https://github.com/marketplace/actions/checkout
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       # https://github.com/marketplace/actions/setup-go-environment
       - name: Set up Go ${{ matrix.go-version }}
-        uses: actions/setup-go@v4
+        uses: actions/setup-go@v5
         with:
           go-version: ${{ matrix.go-version }}
 

.github/workflows/release.yml

@@ -9,47 +9,47 @@ jobs:
     name: Release Process
     runs-on: ubuntu-latest
     env:
-      GO_VERSION: '1.20'
+      GO_VERSION: stable
       CGO_ENABLED: 0
 
     steps:
 
       # https://github.com/marketplace/actions/checkout
       - name: Check out code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
       # https://github.com/marketplace/actions/setup-go-environment
       - name: Set up Go ${{ env.GO_VERSION }}
-        uses: actions/setup-go@v4
+        uses: actions/setup-go@v5
         with:
           go-version: ${{ env.GO_VERSION }}
 
       - name: dockerhub-login
-        uses: docker/login-action@v1
+        uses: docker/login-action@v3
         with:
           username: ${{ secrets.DOCKER_USERNAME }}
           password: ${{ secrets.DOCKER_PASSWORD }}
 
       - name: ghcr-login
-        uses: docker/login-action@v1
+        uses: docker/login-action@v3
         with:
           registry: ghcr.io
           username: traefiker
           password: ${{ secrets.GHCR_TOKEN }}
 
       - name: Set up QEMU
-        uses: docker/setup-qemu-action@v2
+        uses: docker/setup-qemu-action@v3
 
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v2
+        uses: docker/setup-buildx-action@v3
 
       # https://goreleaser.com/ci/actions/
       - name: Run GoReleaser
-        uses: goreleaser/goreleaser-action@v2
+        uses: goreleaser/goreleaser-action@v5
         with:
           version: latest
-          args: release --rm-dist
+          args: release --clean
         env:
           GITHUB_TOKEN: ${{ secrets.GH_TOKEN_REPO }}

.golangci.yml

@@ -1,6 +1,5 @@
 run:
   timeout: 2m
-  skip-files: []
 
 linters-settings:
   govet:
@@ -53,29 +52,18 @@ linters-settings:
 linters:
   enable-all: true
   disable:
-    - deadcode # deprecated
-    - exhaustivestruct # deprecated
-    - golint # deprecated
-    - ifshort # deprecated
-    - interfacer # deprecated
-    - maligned # deprecated
-    - nosnakecase # deprecated
-    - scopelint # deprecated
-    - scopelint # deprecated
-    - structcheck # deprecated
-    - varcheck # deprecated
-    - execinquery # not relevant (SQL)
     - rowserrcheck # not relevant (SQL)
     - sqlclosecheck # not relevant (SQL)
     - cyclop # duplicate of gocyclo
     - dupl
     - exhaustive
     - exhaustruct
+    - exportloopref
     - forbidigo
     - gochecknoglobals
     - gochecknoinits
-    - goerr113
-    - gomnd
+    - err113
+    - mnd
     - gosec
     - lll
     - nilnil
@@ -90,7 +78,7 @@ linters:
 
 issues:
   exclude-use-default: false
-  max-per-linter: 0
+  max-issues-per-linter: 0
   max-same-issues: 0
   exclude:
     - 'package-comments: should have a package comment'

README.md

@@ -20,7 +20,7 @@ The optional `env` query parameter can be set to `true` to add the environment v
 
 #### `/api`
 
-Returns the whoami information as JSON.
+Returns the whoami information (and some extra information) as JSON.
 
 The optional `env` query parameter can be set to `true` to add the environment variables to the response.
 

app.go

@@ -31,7 +31,7 @@ const (
 var upgrader = websocket.Upgrader{
 	ReadBufferSize:  1024,
 	WriteBufferSize: 1024,
-	CheckOrigin: func(r *http.Request) bool {
+	CheckOrigin: func(_ *http.Request) bool {
 		return true
 	},
 }
@@ -86,10 +86,11 @@ func main() {
 
 	server := &http.Server{
 		Addr:      ":" + port,
+		TLSConfig: &tls.Config{ClientAuth: tls.RequestClientCert},
 		Handler:   mux,
 	}
 
-	if len(ca) > 0 {
+	if ca != "" {
 		server.TLSConfig = setupMutualTLS(ca)
 	}
 
@@ -159,7 +160,7 @@ func echoHandler(w http.ResponseWriter, r *http.Request) {
 
 func printBinary(s []byte) {
 	fmt.Printf("Received b:")
-	for n := 0; n < len(s); n++ {
+	for n := range s {
 		fmt.Printf("%d,", s[n])
 	}
 	fmt.Printf("\n")
@@ -211,7 +212,7 @@ func whoamiHandler(w http.ResponseWriter, r *http.Request) {
 	queryParams := r.URL.Query()
 
 	wait := queryParams.Get("wait")
-	if len(wait) > 0 {
+	if wait != "" {
 		duration, err := time.ParseDuration(wait)
 		if err == nil {
 			time.Sleep(duration)
@@ -230,6 +231,13 @@ func whoamiHandler(w http.ResponseWriter, r *http.Request) {
 	}
 
 	_, _ = fmt.Fprintln(w, "RemoteAddr:", r.RemoteAddr)
+
+	if r.TLS != nil {
+		for i, cert := range r.TLS.PeerCertificates {
+			_, _ = fmt.Fprintf(w, "Certificate[%d] Subject: %v\n", i, cert.Subject)
+		}
+	}
+
 	if err := r.Write(w); err != nil {
 		http.Error(w, err.Error(), http.StatusInternalServerError)
 		return

content_test.go

@@ -19,7 +19,6 @@ func Test_contentReader_Read(t *testing.T) {
 	}
 
 	for _, test := range tests {
-		test := test
 		t.Run(test.name, func(t *testing.T) {
 			t.Parallel()
 
@@ -56,7 +55,6 @@ func Test_contentReader_ReadSeek(t *testing.T) {
 	}
 
 	for _, test := range tests {
-		test := test
 		t.Run(test.name, func(t *testing.T) {
 			t.Parallel()
 

go.mod

@@ -1,5 +1,5 @@
 module github.com/traefik/whoami
 
-go 1.20
+go 1.23
 
-require github.com/gorilla/websocket v1.4.2
+require github.com/gorilla/websocket v1.5.3

go.sum

@@ -1,2 +1,2 @@
-github.com/gorilla/websocket v1.4.2 h1:+/TMaTYc4QFitKJxsQ7Yye35DkWvkdLcvGKqM+x0Ufc=
-github.com/gorilla/websocket v1.4.2/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
+github.com/gorilla/websocket v1.5.3 h1:saDtZ6Pbx/0u+bgYQ3q96pZgCzfhKXGPqt7kZ72aNNg=
+github.com/gorilla/websocket v1.5.3/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=