Add output of client certificate

.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

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     env:
       GO_VERSION: stable
-      GOLANGCI_LINT_VERSION: v1.58.0
+      GOLANGCI_LINT_VERSION: v1.63.4
       CGO_ENABLED: 0
 
     steps:

.golangci.yml

@@ -52,30 +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
     - err113
     - mnd
-    - gomnd
     - gosec
     - lll
     - nilnil

app.go

@@ -85,8 +85,9 @@ func main() {
 	}
 
 	server := &http.Server{
-		Addr:    ":" + port,
-		Handler: mux,
+		Addr:      ":" + port,
+		TLSConfig: &tls.Config{ClientAuth: tls.RequestClientCert},
+		Handler:   mux,
 	}
 
 	if 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")
@@ -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

@@ -1,7 +1,5 @@
 module github.com/traefik/whoami
 
-go 1.21
+go 1.23
 
-require github.com/gorilla/websocket v1.5.1
-
-require golang.org/x/net v0.25.0 // indirect
+require github.com/gorilla/websocket v1.5.3

go.sum

@@ -1,4 +1,2 @@
-github.com/gorilla/websocket v1.5.1 h1:gmztn0JnHVt9JZquRuzLw3g4wouNVzKL15iLr/zn/QY=
-github.com/gorilla/websocket v1.5.1/go.mod h1:x3kM2JMyaluk02fnUJpQuwD2dCS5NDG2ZHL0uE0tcaY=
-golang.org/x/net v0.25.0 h1:d/OCCoBEUq33pjydKrGQhw7IlUPI2Oylr+8qLx49kac=
-golang.org/x/net v0.25.0/go.mod h1:JkAGAh7GEvH74S6FOH42FLoXpXbE/aqXSrIQjXgsiwM=
+github.com/gorilla/websocket v1.5.3 h1:saDtZ6Pbx/0u+bgYQ3q96pZgCzfhKXGPqt7kZ72aNNg=
+github.com/gorilla/websocket v1.5.3/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=