chore: enforce platform

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

.github/workflows/ci.yml

@@ -0,0 +1,58 @@
+name: Main
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+
+jobs:
+
+  main:
+    name: Main Process
+    runs-on: ubuntu-latest
+    env:
+      GO_VERSION: 1.19
+      GOLANGCI_LINT_VERSION: v1.49.0
+      CGO_ENABLED: 0
+
+    steps:
+
+      # https://github.com/marketplace/actions/setup-go-environment
+      - name: Set up Go ${{ env.GO_VERSION }}
+        uses: actions/setup-go@v2
+        with:
+          go-version: ${{ env.GO_VERSION }}
+
+      # https://github.com/marketplace/actions/checkout
+      - name: Check out code
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+
+      # https://github.com/marketplace/actions/cache
+      - name: Cache Go modules
+        uses: actions/cache@v2
+        with:
+          path: ~/go/pkg/mod
+          key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
+          restore-keys: |
+            ${{ runner.os }}-go-
+
+      - name: Check and get dependencies
+        run: |
+          go mod tidy
+          git diff --exit-code go.mod
+          git diff --exit-code go.sum
+
+      # https://golangci-lint.run/usage/install#other-ci
+      - name: Install golangci-lint ${{ env.GOLANGCI_LINT_VERSION }}
+        run: |
+          curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b $(go env GOPATH)/bin ${GOLANGCI_LINT_VERSION}
+          golangci-lint --version
+
+      - name: Make
+        run: make
+
+      - name: Make Image
+        run: make image

.github/workflows/go-cross.yml

@@ -0,0 +1,54 @@
+name: Go Matrix
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+
+jobs:
+
+  cross:
+    name: Go
+    runs-on: ${{ matrix.os }}
+    env:
+      CGO_ENABLED: 0
+
+    strategy:
+      matrix:
+        go-version: [ 1.19, 1.x ]
+        os: [ubuntu-latest, macos-latest, windows-latest]
+
+    steps:
+      # https://github.com/marketplace/actions/setup-go-environment
+      - name: Set up Go ${{ matrix.go-version }}
+        uses: actions/setup-go@v2
+        with:
+          go-version: ${{ matrix.go-version }}
+
+      # https://github.com/marketplace/actions/checkout
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      # https://github.com/marketplace/actions/cache
+      - name: Cache Go modules
+        uses: actions/cache@v2
+        with:
+          # In order:
+          # * Module download cache
+          # * Build cache (Linux)
+          # * Build cache (Mac)
+          # * Build cache (Windows)
+          path: |
+            ~/go/pkg/mod
+            ~/.cache/go-build
+            ~/Library/Caches/go-build
+            %LocalAppData%\go-build
+          key: ${{ runner.os }}-${{ matrix.go-version }}-go-${{ hashFiles('**/go.sum') }}
+          restore-keys: |
+            ${{ runner.os }}-${{ matrix.go-version }}-go-
+
+      - name: Test
+        run: go test -v -cover ./...
+
+      - name: Build
+        run: go build -v -ldflags "-s -w" -trimpath

.github/workflows/release.yml

@@ -0,0 +1,47 @@
+name: "Release a tag"
+on:
+  push:
+    tags:
+      - v*
+
+jobs:
+  release:
+    name: Release Process
+    runs-on: ubuntu-latest
+    env:
+      GO_VERSION: 1.19
+      SEIHON_VERSION: v0.9.0
+      CGO_ENABLED: 0
+
+    steps:
+
+      # https://github.com/marketplace/actions/setup-go-environment
+      - name: Set up Go ${{ env.GO_VERSION }}
+        uses: actions/setup-go@v2
+        with:
+          go-version: ${{ env.GO_VERSION }}
+
+      # https://github.com/marketplace/actions/checkout
+      - name: Check out code
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+
+      - name: Docker Login
+        env:
+          DOCKER_USERNAME: ${{ secrets.DOCKER_USERNAME }}
+          DOCKER_PASSWORD: ${{ secrets.DOCKER_PASSWORD }}
+        run: |
+          echo "${DOCKER_PASSWORD}" | docker login --username "${DOCKER_USERNAME}" --password-stdin
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+
+      # https://goreleaser.com/ci/actions/
+      - name: Run GoReleaser
+        uses: goreleaser/goreleaser-action@v2
+        with:
+          version: latest
+          args: release --rm-dist
+        env:
+          GITHUB_TOKEN: ${{ secrets.GH_TOKEN_REPO }}

.gitignore

@@ -1 +1,4 @@
-/whoamI
+.idea
+vendor/
+/whoami
+dist/

.golangci.yml

@@ -0,0 +1,93 @@
+run:
+  timeout: 2m
+  skip-files: []
+
+linters-settings:
+  govet:
+    enable-all: true
+    disable:
+      - fieldalignment
+  gocyclo:
+    min-complexity: 16
+  goconst:
+    min-len: 3
+    min-occurrences: 3
+  misspell:
+    locale: US
+  funlen:
+    lines: -1
+    statements: 40
+  gofumpt:
+    extra-rules: true
+  depguard:
+    list-type: blacklist
+    include-go-root: false
+    packages:
+      - github.com/pkg/errors
+  godox:
+    keywords:
+      - FIXME
+  gocritic:
+    enabled-tags:
+      - diagnostic
+      - style
+      - performance
+    disabled-checks:
+      - sloppyReassign
+      - rangeValCopy
+      - octalLiteral
+      - paramTypeCombine # already handle by gofumpt.extra-rules
+    settings:
+      hugeParam:
+        sizeThreshold: 100
+  forbidigo:
+    forbid:
+      - '^print(ln)?$'
+      - '^panic$'
+      - '^spew\.Print(f|ln)?$'
+      - '^spew\.Dump$'
+
+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
+    - forbidigo
+    - gochecknoglobals
+    - gochecknoinits
+    - goerr113
+    - gomnd
+    - gosec
+    - lll
+    - nilnil
+    - nlreturn
+    - paralleltest
+    - prealloc
+    - testpackage
+    - tparallel
+    - varnamelen
+    - wrapcheck
+    - wsl
+
+issues:
+  exclude-use-default: false
+  max-per-linter: 0
+  max-same-issues: 0
+  exclude:
+    - 'package-comments: should have a package comment'

.goreleaser.yml

@@ -0,0 +1,86 @@
+project_name: whoami
+
+builds:
+  - binary: whoami
+    goos:
+      - windows
+      - darwin
+      - linux
+    goarch:
+      - amd64
+      - arm
+      - arm64
+    goarm:
+      - '7'
+
+changelog:
+  sort: asc
+  filters:
+    exclude:
+      - '^docs:'
+      - '^doc:'
+      - '^chore:'
+      - '^chore(deps):'
+      - '^test:'
+      - '^tests:'
+
+archives:
+  - id: whoami
+    name_template: '{{ .ProjectName }}_v{{ .Version }}_{{ .Os }}_{{ .Arch }}{{ if .Arm}}v{{ .Arm }}{{ end }}'
+    format: tar.gz
+    format_overrides:
+      - goos: windows
+        format: zip
+    files:
+      - LICENSE
+
+docker_manifests:
+  - name_template: 'traefik/whoami:{{ .Tag }}'
+    image_templates:
+      - 'traefik/whoami:{{ .Tag }}-amd64'
+      - 'traefik/whoami:{{ .Tag }}-arm64'
+  - name_template: 'traefik/whoami:latest'
+    image_templates:
+      - 'traefik/whoami:{{ .Tag }}-amd64'
+      - 'traefik/whoami:{{ .Tag }}-arm64'
+  - name_template: 'traefik/whoami:v{{ .Major }}.{{ .Minor }}'
+    image_templates:
+      - 'traefik/whoami:v{{ .Major }}.{{ .Minor }}-amd64'
+      - 'traefik/whoami:v{{ .Major }}.{{ .Minor }}-arm64'
+
+dockers:
+  - use: buildx
+    goos: linux
+    goarch: amd64
+    dockerfile: buildx.Dockerfile
+    image_templates:
+      - 'traefik/whoami:latest-amd64'
+      - 'traefik/whoami:{{ .Tag }}-amd64'
+      - 'traefik/whoami:v{{ .Major }}.{{ .Minor }}-amd64'
+    build_flag_templates:
+      - '--pull'
+      - '--label=org.opencontainers.image.description=Tiny Go webserver that prints OS information and HTTP request to output'
+      - '--label=org.opencontainers.image.created={{.Date}}'
+      - '--label=org.opencontainers.image.title={{.ProjectName}}'
+      - '--label=org.opencontainers.image.revision={{.FullCommit}}'
+      - '--label=org.opencontainers.image.version={{.Version}}'
+      - '--label=org.opencontainers.image.source={{.GitURL}}'
+      - '--platform=linux/amd64'
+
+  - use: buildx
+    goos: linux
+    goarch: arm64
+    dockerfile: buildx.Dockerfile
+    image_templates:
+      - 'traefik/whoami:latest-arm64'
+      - 'traefik/whoami:{{ .Tag }}-arm64'
+      - 'traefik/whoami:v{{ .Major }}.{{ .Minor }}-arm64'
+    build_flag_templates:
+      - '--pull'
+      - '--label=org.opencontainers.image.description=Tiny Go webserver that prints OS information and HTTP request to output'
+      - '--label=org.opencontainers.image.created={{.Date}}'
+      - '--label=org.opencontainers.image.title={{.ProjectName}}'
+      - '--label=org.opencontainers.image.revision={{.FullCommit}}'
+      - '--label=org.opencontainers.image.version={{.Version}}'
+      - '--label=org.opencontainers.image.source={{.GitURL}}'
+      - '--platform=linux/arm64'

Dockerfile

@@ -1,5 +1,26 @@
+FROM golang:1-alpine as builder
+
+RUN apk --no-cache --no-progress add git ca-certificates tzdata make \
+    && update-ca-certificates \
+    && rm -rf /var/cache/apk/*
+
+WORKDIR /go/whoami
+
+# Download go modules
+COPY go.mod .
+COPY go.sum .
+RUN GO111MODULE=on GOPROXY=https://proxy.golang.org go mod download
+
+COPY . .
+
+RUN make build
+
 # Create a minimal container to run a Golang static binary
 FROM scratch
-COPY whoamI /
-ENTRYPOINT ["/whoamI"]
+
+COPY --from=builder /usr/share/zoneinfo /usr/share/zoneinfo
+COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
+COPY --from=builder /go/whoami/whoami .
+
+ENTRYPOINT ["/whoami"]
 EXPOSE 80

LICENSE

@@ -0,0 +1,202 @@
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
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+      other entities that control, are controlled by, or are under common
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+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
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+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
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+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
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+
+   6. Trademarks. This License does not grant permission to use the trade
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+   7. Disclaimer of Warranty. Unless required by applicable law or
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+      Contributor provides its Contributions) on an "AS IS" BASIS,
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+   9. Accepting Warranty or Additional Liability. While redistributing
+      the Work or Derivative Works thereof, You may choose to offer,
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+      on Your own behalf and on Your sole responsibility, not on behalf
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+
+   END OF TERMS AND CONDITIONS
+
+   APPENDIX: How to apply the Apache License to your work.
+
+      To apply the Apache License to your work, attach the following
+      boilerplate notice, with the fields enclosed by brackets "[]"
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+   Copyright [2015-2019] [Containous]
+   Copyright [2020-2022] [Traefik Labs]
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
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+   See the License for the specific language governing permissions and
+   limitations under the License.

Makefile

@@ -0,0 +1,22 @@
+.PHONY: default check test build image publish-images
+
+TAG_NAME := $(shell git tag -l --contains HEAD)
+
+IMAGE_NAME := traefik/whoami
+
+default: check test build
+
+build:
+	CGO_ENABLED=0 go build -a --trimpath --installsuffix cgo --ldflags="-s" -o whoami
+
+test:
+	go test -v -cover ./...
+
+check:
+	golangci-lint run
+
+image:
+	docker build -t $(IMAGE_NAME) .
+
+publish-images:
+	seihon publish -v "$(TAG_NAME)" -v "latest" --image-name $(IMAGE_NAME) --dry-run=false

README.md

@@ -1,11 +1,65 @@
-# whoamI
+# whoami
 
-Tiny Go webserver that prints os information and HTTP request to output
+[![Docker Pulls](https://img.shields.io/docker/pulls/traefik/whoami.svg)](https://hub.docker.com/r/traefik/whoami/)
+[![Build Status](https://github.com/traefik/whoami/workflows/Main/badge.svg?branch=master)](https://github.com/traefik/whoami/actions)
+
+Tiny Go webserver that prints OS information and HTTP request to output.
+
+## Usage
+
+### Paths
+
+#### `/[?wait=d]`
+
+Returns the whoami information (request and network information).
+
+The optional `wait` query parameter can be provided to tell the server to wait before sending the response.
+The duration is expected in Go's [`time.Duration`](https://golang.org/pkg/time/#ParseDuration) format (e.g. `/?wait=100ms` to wait 100 milliseconds).
+
+#### `/api`
+
+Returns the whoami information as JSON.
+
+#### `/bench`
+
+Always return the same response (`1`).
+
+#### `/data?size=n[&unit=u]`
+
+Creates a response with a size `n`.
+
+The unit of measure, if specified, accepts the following values: `KB`, `MB`, `GB`, `TB` (optional, default: bytes).
+
+#### `/echo`
+
+WebSocket echo.
+
+#### `/health`
+
+Heath check.
+
+- `GET`, `HEAD`, ...: returns a response with the status code defined by the `POST`
+- `POST`: changes the status code of the `GET` (`HEAD`, ...) response.
+
+### Flags
+
+| Flag      | Env var              | Description                             |
+|-----------|----------------------|-----------------------------------------|
+| `cert`    |                      | Give me a certificate.                  |
+| `key`     |                      | Give me a key.                          |
+| `cacert`  |                      | Give me a CA chain, enforces mutual TLS |
+| `port`    | `WHOAMI_PORT_NUMBER` | Give me a port number. (default: `80`)  |
+| `name`    | `WHOAMI_NAME`        | Give me a name.                         |
+| `verbose` |                      | Enable verbose logging.                 |
+
+## Examples
+
+```console
+$ docker run -d -P --name iamfoo traefik/whoami
 
-```sh
-$ docker run -d -P --name iamfoo emilevauge/whoami
 $ docker inspect --format '{{ .NetworkSettings.Ports }}'  iamfoo
 map[80/tcp:[{0.0.0.0 32769}]]
+
 $ curl "http://0.0.0.0:32769"
 Hostname :  6e0030e67d6a
 IP :  127.0.0.1
@@ -17,3 +71,39 @@ Host: 0.0.0.0:32769
 User-Agent: curl/7.35.0
 Accept: */*
 ```
+
+```console
+# updates health check status
+$ curl -X POST -d '500' http://localhost:80/health
+
+# calls the health check
+$ curl -v http://localhost:80/health
+*   Trying ::1:80...
+* TCP_NODELAY set
+* Connected to localhost (::1) port 80 (#0)
+> GET /health HTTP/1.1
+> Host: localhost:80
+> User-Agent: curl/7.65.3
+> Accept: */*
+> 
+* Mark bundle as not supporting multiuse
+< HTTP/1.1 500 Internal Server Error
+< Date: Mon, 16 Sep 2019 22:52:40 GMT
+< Content-Length: 0
+```
+
+```console
+docker run -d -P -v ./certs:/certs --name iamfoo traefik/whoami --cert /certs/example.cert --key /certs/example.key
+```
+
+```yml
+version: '3.9'
+
+services:
+  whoami:
+    image: traefik/whoami
+    command:
+       # It tells whoami to start listening on 2001 instead of 80
+       - --port 2001
+       - --name iamfoo
+```

app.go

@@ -1,28 +1,216 @@
 package main
 
 import (
+	"crypto/tls"
+	"crypto/x509"
+	"encoding/json"
+	"flag"
 	"fmt"
-	"github.com/gorilla/mux"
+	"io"
 	"log"
 	"net"
 	"net/http"
+	"net/url"
 	"os"
+	"strconv"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/gorilla/websocket"
 )
 
-func main() {
+// Units.
+const (
+	_        = iota
+	KB int64 = 1 << (10 * iota)
+	MB
+	GB
+	TB
+)
 
-	r := mux.NewRouter()
-	r.HandleFunc("/", whoamI)
-	http.Handle("/", r)
-	fmt.Println("Starting up on 80")
-	log.Fatal(http.ListenAndServe(":80", nil))
+var (
+	cert    string
+	key     string
+	ca      string
+	port    string
+	name    string
+	verbose bool
+)
+
+func init() {
+	flag.BoolVar(&verbose, "verbose", false, "Enable verbose logging")
+	flag.StringVar(&cert, "cert", "", "give me a certificate")
+	flag.StringVar(&key, "key", "", "give me a key")
+	flag.StringVar(&ca, "cacert", "", "give me a CA chain, enforces mutual TLS")
+	flag.StringVar(&port, "port", getEnv("WHOAMI_PORT_NUMBER", "80"), "give me a port number")
+	flag.StringVar(&name, "name", os.Getenv("WHOAMI_NAME"), "give me a name")
+}
+
+var upgrader = websocket.Upgrader{
+	ReadBufferSize:  1024,
+	WriteBufferSize: 1024,
+}
+
+func main() {
+	flag.Parse()
+
+	mux := http.NewServeMux()
+	mux.Handle("/data", handle(dataHandler, verbose))
+	mux.Handle("/echo", handle(echoHandler, verbose))
+	mux.Handle("/bench", handle(benchHandler, verbose))
+	mux.Handle("/api", handle(apiHandler, verbose))
+	mux.Handle("/health", handle(healthHandler, verbose))
+	mux.Handle("/", handle(whoamiHandler, verbose))
+
+	if cert == "" || key == "" {
+		log.Printf("Starting up on port %s", port)
+
+		log.Fatal(http.ListenAndServe(":"+port, mux))
+	}
+
+	server := &http.Server{
+		Addr:    ":" + port,
+		Handler: mux,
+	}
+
+	if len(ca) > 0 {
+		server.TLSConfig = setupMutualTLS(ca)
+	}
+
+	log.Printf("Starting up with TLS on port %s", port)
+
+	log.Fatal(server.ListenAndServeTLS(cert, key))
+}
+
+func setupMutualTLS(ca string) *tls.Config {
+	clientCACert, err := os.ReadFile(ca)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	clientCertPool := x509.NewCertPool()
+	clientCertPool.AppendCertsFromPEM(clientCACert)
+
+	tlsConfig := &tls.Config{
+		ClientAuth:               tls.RequireAndVerifyClientCert,
+		ClientCAs:                clientCertPool,
+		PreferServerCipherSuites: true,
+		MinVersion:               tls.VersionTLS12,
+	}
+
+	return tlsConfig
+}
+
+func handle(next http.HandlerFunc, verbose bool) http.Handler {
+	if !verbose {
+		return next
+	}
+
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		next(w, r)
+
+		// <remote_IP_address> - [<timestamp>] "<request_method> <request_path> <request_protocol>" -
+		log.Printf("%s - - [%s] \"%s %s %s\" - -", r.RemoteAddr, time.Now().Format("02/Jan/2006:15:04:05 -0700"), r.Method, r.URL.Path, r.Proto)
+	})
+}
+
+func benchHandler(w http.ResponseWriter, _ *http.Request) {
+	w.Header().Set("Connection", "keep-alive")
+	w.Header().Set("Content-Type", "text/plain")
+	_, _ = fmt.Fprint(w, "1")
+}
+
+func echoHandler(w http.ResponseWriter, r *http.Request) {
+	conn, err := upgrader.Upgrade(w, r, nil)
+	if err != nil {
+		log.Println(err)
+		return
+	}
+
+	for {
+		messageType, p, err := conn.ReadMessage()
+		if err != nil {
+			return
+		}
+
+		printBinary(p)
+		err = conn.WriteMessage(messageType, p)
+		if err != nil {
+			return
+		}
+	}
+}
+
+func printBinary(s []byte) {
+	fmt.Printf("Received b:")
+	for n := 0; n < len(s); n++ {
+		fmt.Printf("%d,", s[n])
+	}
+	fmt.Printf("\n")
+}
+
+func dataHandler(w http.ResponseWriter, r *http.Request) {
+	u, _ := url.Parse(r.URL.String())
+	queryParams := u.Query()
+
+	size, err := strconv.ParseInt(queryParams.Get("size"), 10, 64)
+	if err != nil {
+		size = 1
+	}
+	if size < 0 {
+		size = 0
+	}
+
+	unit := queryParams.Get("unit")
+	switch strings.ToLower(unit) {
+	case "kb":
+		size *= KB
+	case "mb":
+		size *= MB
+	case "gb":
+		size *= GB
+	case "tb":
+		size *= TB
+	}
+
+	attachment, err := strconv.ParseBool(queryParams.Get("attachment"))
+	if err != nil {
+		attachment = false
+	}
+
+	content := &contentReader{size: size}
+
+	if attachment {
+		w.Header().Set("Content-Disposition", "Attachment")
+		http.ServeContent(w, r, "data.txt", time.Now(), content)
+		return
+	}
+
+	if _, err := io.Copy(w, content); err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+}
+
+func whoamiHandler(w http.ResponseWriter, req *http.Request) {
+	u, _ := url.Parse(req.URL.String())
+	wait := u.Query().Get("wait")
+	if len(wait) > 0 {
+		duration, err := time.ParseDuration(wait)
+		if err == nil {
+			time.Sleep(duration)
+		}
+	}
+
+	if name != "" {
+		_, _ = fmt.Fprintln(w, "Name:", name)
 	}
 
-func whoamI(w http.ResponseWriter, req *http.Request) {
 	hostname, _ := os.Hostname()
-	fmt.Fprintln(w, "Hostname : ", hostname)
+	_, _ = fmt.Fprintln(w, "Hostname:", hostname)
+
 	ifaces, _ := net.Interfaces()
-	// handle err
 	for _, i := range ifaces {
 		addrs, _ := i.Addrs()
 		// handle err
@@ -34,8 +222,97 @@ func whoamI(w http.ResponseWriter, req *http.Request) {
 			case *net.IPAddr:
 				ip = v.IP
 			}
-			fmt.Fprintln(w, "IP : ", ip)
+			_, _ = fmt.Fprintln(w, "IP:", ip)
 		}
 	}
-	req.Write(w)
+
+	_, _ = fmt.Fprintln(w, "RemoteAddr:", req.RemoteAddr)
+	if err := req.Write(w); err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+}
+
+func apiHandler(w http.ResponseWriter, req *http.Request) {
+	hostname, _ := os.Hostname()
+
+	data := struct {
+		Hostname string      `json:"hostname,omitempty"`
+		IP       []string    `json:"ip,omitempty"`
+		Headers  http.Header `json:"headers,omitempty"`
+		URL      string      `json:"url,omitempty"`
+		Host     string      `json:"host,omitempty"`
+		Method   string      `json:"method,omitempty"`
+		Name     string      `json:"name,omitempty"`
+	}{
+		Hostname: hostname,
+		IP:       []string{},
+		Headers:  req.Header,
+		URL:      req.URL.RequestURI(),
+		Host:     req.Host,
+		Method:   req.Method,
+		Name:     name,
+	}
+
+	ifaces, _ := net.Interfaces()
+	for _, i := range ifaces {
+		addrs, _ := i.Addrs()
+		// handle err
+		for _, addr := range addrs {
+			var ip net.IP
+			switch v := addr.(type) {
+			case *net.IPNet:
+				ip = v.IP
+			case *net.IPAddr:
+				ip = v.IP
+			}
+			if ip != nil {
+				data.IP = append(data.IP, ip.String())
+			}
+		}
+	}
+
+	w.Header().Set("Content-Type", "application/json")
+	if err := json.NewEncoder(w).Encode(data); err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+}
+
+type healthState struct {
+	StatusCode int
+}
+
+var (
+	currentHealthState = healthState{http.StatusOK}
+	mutexHealthState   = &sync.RWMutex{}
+)
+
+func healthHandler(w http.ResponseWriter, req *http.Request) {
+	if req.Method == http.MethodPost {
+		var statusCode int
+
+		if err := json.NewDecoder(req.Body).Decode(&statusCode); err != nil {
+			http.Error(w, err.Error(), http.StatusBadRequest)
+			return
+		}
+
+		fmt.Printf("Update health check status code [%d]\n", statusCode)
+
+		mutexHealthState.Lock()
+		defer mutexHealthState.Unlock()
+		currentHealthState.StatusCode = statusCode
+	} else {
+		mutexHealthState.RLock()
+		defer mutexHealthState.RUnlock()
+		w.WriteHeader(currentHealthState.StatusCode)
+	}
+}
+
+func getEnv(key, fallback string) string {
+	value := os.Getenv(key)
+	if value == "" {
+		return fallback
+	}
+	return value
 }

build.sh

@@ -1,3 +0,0 @@
-#!/bin/sh
-CGO_ENABLED=0 go build -a --installsuffix cgo --ldflags="-s" -o whoamI
-docker build -t emilevauge/whoami .

buildx.Dockerfile

@@ -0,0 +1,17 @@
+# syntax=docker/dockerfile:1.2
+FROM golang:1-alpine as builder
+
+RUN apk --no-cache --no-progress add git ca-certificates tzdata make \
+    && update-ca-certificates \
+    && rm -rf /var/cache/apk/*
+
+# syntax=docker/dockerfile:1.2
+# Create a minimal container to run a Golang static binary
+FROM scratch
+
+COPY --from=builder /usr/share/zoneinfo /usr/share/zoneinfo
+COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
+COPY whoami /
+
+ENTRYPOINT ["/whoami"]
+EXPOSE 80

content.go

@@ -0,0 +1,66 @@
+package main
+
+import (
+	"errors"
+	"io"
+)
+
+const contentCharset = "-ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+
+type contentReader struct {
+	size int64
+	cur  int64
+}
+
+// Read implements the io.Read interface.
+func (r *contentReader) Read(p []byte) (int, error) {
+	length := r.size - 1
+
+	if r.cur >= length {
+		return 0, io.EOF
+	}
+	if len(p) == 0 {
+		return 0, nil
+	}
+
+	var n int
+	if r.cur == 0 {
+		p[n] = '|'
+		r.cur++
+		n++
+	}
+
+	for n < len(p) && r.cur <= length {
+		p[n] = contentCharset[int(r.cur)%len(contentCharset)]
+		r.cur++
+		n++
+	}
+
+	if r.cur >= length {
+		p[n-1] = '|'
+	}
+
+	return n, nil
+}
+
+// Seek implements the io.Seek interface.
+func (r *contentReader) Seek(offset int64, whence int) (int64, error) {
+	switch whence {
+	default:
+		return 0, errors.New("seek: invalid whence")
+	case io.SeekStart:
+		offset += 0
+	case io.SeekCurrent:
+		offset += r.cur
+	case io.SeekEnd:
+		offset += r.size - 1
+	}
+
+	if offset < 0 {
+		return 0, errors.New("seek: invalid offset")
+	}
+
+	r.cur = offset
+
+	return offset, nil
+}

content_test.go

@@ -0,0 +1,82 @@
+package main
+
+import (
+	"io"
+	"testing"
+)
+
+func Test_contentReader_Read(t *testing.T) {
+	tests := []struct {
+		name    string
+		size    int64
+		content string
+	}{
+		{
+			name:    "simple",
+			size:    40,
+			content: "|ABCDEFGHIJKLMNOPQRSTUVWXYZ-ABCDEFGHIJK|",
+		},
+	}
+
+	for _, test := range tests {
+		test := test
+		t.Run(test.name, func(t *testing.T) {
+			t.Parallel()
+
+			d := &contentReader{size: test.size}
+
+			b, err := io.ReadAll(d)
+			if err != nil {
+				t.Errorf("contentReader.Read() error = %v", err)
+				return
+			}
+
+			if string(b) != test.content {
+				t.Errorf("return content does not match expected value: got %s want %s", b, test.content)
+			}
+		})
+	}
+}
+
+func Test_contentReader_ReadSeek(t *testing.T) {
+	tests := []struct {
+		name       string
+		offset     int64
+		seekWhence int
+		size       int64
+		content    string
+	}{
+		{
+			name:       "simple",
+			offset:     10,
+			seekWhence: io.SeekCurrent,
+			size:       40,
+			content:    "JKLMNOPQRSTUVWXYZ-ABCDEFGHIJK|",
+		},
+	}
+
+	for _, test := range tests {
+		test := test
+		t.Run(test.name, func(t *testing.T) {
+			t.Parallel()
+
+			d := &contentReader{size: test.size}
+
+			_, err := d.Seek(test.offset, test.seekWhence)
+			if err != nil {
+				t.Errorf("contentReader.Seek() error = %v", err)
+				return
+			}
+
+			b, err := io.ReadAll(d)
+			if err != nil {
+				t.Errorf("contentReader.Read() error = %v", err)
+				return
+			}
+
+			if string(b) != test.content {
+				t.Errorf("return content does not match expected value: got %s want %s", b, test.content)
+			}
+		})
+	}
+}

go.mod

@@ -0,0 +1,5 @@
+module github.com/traefik/whoami
+
+go 1.19
+
+require github.com/gorilla/websocket v1.4.2

go.sum

@@ -0,0 +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=