Broken registry

main.go

package main

import (
	"fmt"
	"log"
	"net/http"
)

const (
	alpineDigest   = "sha256:e7d88de73db3d3fd9b2d63aa7f447a10fd0220b7cbf39803c803f2af9ba256b3"
	alpineManifest = `{
   "schemaVersion": 2,
   "mediaType": "application/vnd.docker.distribution.manifest.v2+json",
   "config": {
      "mediaType": "application/vnd.docker.container.image.v1+json",
      "size": 1471,
      "digest": "sha256:c059bfaa849c4d8e4aecaeb3a10c2d9b3d85f5165c66ad3a4d937758128c4d18"
   },
   "layers": [
      {
         "mediaType": "application/vnd.docker.image.rootfs.diff.tar.gzip",
         "size": 2818413,
         "digest": "sha256:59bf1c3509f33515622619af21ed55bbe26d24913cedbca106468a5fb37a50c3"
      }
   ]
}`
	alpineConfigDigest = "sha256:c059bfaa849c4d8e4aecaeb3a10c2d9b3d85f5165c66ad3a4d937758128c4d18"
	alpineConfig       = `{"architecture":"amd64","config":{"Hostname":"","Domainname":"","User":"","AttachStdin":false,"AttachStdout":false,"AttachStderr":false,"Tty":false,"OpenStdin":false,"StdinOnce":false,"Env":["PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"],"Cmd":["/bin/sh"],"Image":"sha256:b747534ae29d08c0c84cc4326caf04e873c6d02bb67cd9c7644be2b4fa8d2f31","Volumes":null,"WorkingDir":"","Entrypoint":null,"OnBuild":null,"Labels":null},"container":"4292e8ed2ef2b6dc4bbaf8e1cda0cb5f95b96adc4aa2da3d15181b54d07a0b34","container_config":{"Hostname":"4292e8ed2ef2","Domainname":"","User":"","AttachStdin":false,"AttachStdout":false,"AttachStderr":false,"Tty":false,"OpenStdin":false,"StdinOnce":false,"Env":["PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"],"Cmd":["/bin/sh","-c","#(nop) ","CMD [\"/bin/sh\"]"],"Image":"sha256:b747534ae29d08c0c84cc4326caf04e873c6d02bb67cd9c7644be2b4fa8d2f31","Volumes":null,"WorkingDir":"","Entrypoint":null,"OnBuild":null,"Labels":{}},"created":"2021-11-24T20:19:40.483367546Z","docker_version":"20.10.7","history":[{"created":"2021-11-24T20:19:40.199700946Z","created_by":"/bin/sh -c #(nop) ADD file:9233f6f2237d79659a9521f7e390df217cec49f1a8aa3a12147bbca1956acdb9 in / "},{"created":"2021-11-24T20:19:40.483367546Z","created_by":"/bin/sh -c #(nop)  CMD [\"/bin/sh\"]","empty_layer":true}],"os":"linux","rootfs":{"type":"layers","diff_ids":["sha256:8d3ac3489996423f53d6087c81180006263b79f206d3fdec9e66f0e27ceb8759"]}}`
)

func main() {
	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
		log.Printf("%s - %s %s", r.RemoteAddr, r.Method, r.URL)
		if r.URL.Path == "/v2/" {
			w.Header().Set("Content-Type", "application/json")
			fmt.Fprint(w, "{}\n")
			return
		}
		if r.URL.Path == "/v2/foo/manifests/latest" || r.URL.Path == "/v2/foo/manifests/"+alpineDigest {
			w.Header().Set("Content-Type", "application/vnd.docker.distribution.manifest.v2+json")
			fmt.Fprint(w, alpineManifest)
			return
		}
		if r.URL.Path == "/v2/foo/blobs/"+alpineConfigDigest {
			w.Header().Set("Content-Type", "application/vnd.docker.container.image.v1+json")
			fmt.Fprint(w, alpineConfig)
			return
		}
		http.Error(w, "Service Unavailable", http.StatusServiceUnavailable)
	})
	http.ListenAndServe(":8080", nil)
}