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add vanity url code

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Asim Aslam
2021-09-14 14:31:31 +01:00
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# M3O Go Vanity URL
M3O Go Vanity URL is a simple Go server that sets the custom url `go.m3o.com`
## Quickstart
Install and run the binary:
```
$ go get -u github.com/m3o-go/cmd/m3o-go-url
$ # update vanity.yaml
$ m3o-go-url
$ # open http://localhost:8080
```
### Google App Engine
Install [gcloud](https://cloud.google.com/sdk/downloads) and install Go App Engine component:
```
$ gcloud components install app-engine-go
```
Setup a [custom domain](https://cloud.google.com/appengine/docs/standard/python/using-custom-domains-and-ssl) for your app.
Get the application:
```
git clone https://github.com/GoogleCloudPlatform/govanityurls
cd govanityurls
```
Edit `vanity.yaml` to add any number of git repos. E.g., `customdomain.com/portmidi` will
serve the [https://github.com/rakyll/portmidi](https://github.com/rakyll/portmidi) repo.
```
paths:
/portmidi:
repo: https://github.com/rakyll/portmidi
```
You can add as many rules as you wish.
Deploy the app:
```
$ gcloud app deploy
```
That's it! You can use `go get` to get the package from your custom domain.
```
$ go get customdomain.com/portmidi
```
### Running in other environments
You can also deploy this as an App Engine Flexible app by changing the
`app.yaml` file:
```
runtime: go
env: flex
```
This project is a normal Go HTTP server, so you can also incorporate the
handler into larger Go servers.
## Configuration File
```
host: example.com
cache_max_age: 3600
paths:
/foo:
repo: https://github.com/example/foo
display: "https://github.com/example/foo https://github.com/example/foo/tree/master{/dir} https://github.com/example/foo/blob/master{/dir}/{file}#L{line}"
vcs: git
```
<table>
<thead>
<tr>
<th scope="col">Key</th>
<th scope="col">Required</th>
<th scope="col">Description</th>
</tr>
</thead>
<tbody>
<tr>
<th scope="row"><code>cache_max_age</code></th>
<td>optional</td>
<td>The amount of time to cache package pages in seconds. Controls the <code>max-age</code> directive sent in the <a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Cache-Control"><code>Cache-Control</code></a> HTTP header.</td>
</tr>
<tr>
<th scope="row"><code>host</code></th>
<td>optional</td>
<td>Host name to use in meta tags. If omitted, uses the App Engine default version host or the Host header on non-App Engine Standard environments. You can use this option to fix the host when using this service behind a reverse proxy or a <a href="https://cloud.google.com/appengine/docs/standard/go/how-requests-are-routed#routing_with_a_dispatch_file">custom dispatch file</a>.</td>
</tr>
<tr>
<th scope="row"><code>paths</code></th>
<td>required</td>
<td>Map of paths to path configurations. Each key is a path that will point to the root of a repository hosted elsewhere. The fields are documented in the Path Configuration section below.</td>
</tr>
</tbody>
</table>
### Path Configuration
<table>
<thead>
<tr>
<th scope="col">Key</th>
<th scope="col">Required</th>
<th scope="col">Description</th>
</tr>
</thead>
<tbody>
<tr>
<th scope="row"><code>display</code></th>
<td>optional</td>
<td>The last three fields of the <a href="https://github.com/golang/gddo/wiki/Source-Code-Links"><code>go-source</code> meta tag</a>. If omitted, it is inferred from the code hosting service if possible.</td>
</tr>
<tr>
<th scope="row"><code>repo</code></th>
<td>required</td>
<td>Root URL of the repository as it would appear in <a href="https://golang.org/cmd/go/#hdr-Remote_import_paths"><code>go-import</code> meta tag</a>.</td>
</tr>
<tr>
<th scope="row"><code>vcs</code></th>
<td>required if ambiguous</td>
<td>If the version control system cannot be inferred (e.g. for Bitbucket or a custom domain), then this specifies the version control system as it would appear in <a href="https://golang.org/cmd/go/#hdr-Remote_import_paths"><code>go-import</code> meta tag</a>. This can be one of <code>git</code>, <code>hg</code>, <code>svn</code>, or <code>bzr</code>.</td>
</tr>
</tbody>
</table>

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module github.com/m3o-go/cmd/m3o-go-url
go 1.13
require (
github.com/golang/protobuf v1.3.3 // indirect
golang.org/x/net v0.0.0-20200202094626-16171245cfb2 // indirect
google.golang.org/appengine v1.6.5
gopkg.in/yaml.v2 v2.2.8
)

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github.com/golang/protobuf v1.3.1/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
github.com/golang/protobuf v1.3.3/go.mod h1:vzj43D7+SQXF/4pzW/hwtAqwc6iTitCiVSaWz5lYuqw=
golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
golang.org/x/net v0.0.0-20190603091049-60506f45cf65/go.mod h1:HSz+uSET+XFnRR8LxR5pz3Of3rY3CfYBVs4xY44aLks=
golang.org/x/net v0.0.0-20200202094626-16171245cfb2/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
google.golang.org/appengine v1.6.5/go.mod h1:8WjMMxjGQR8xUklV/ARdw2HLXBOI7O7uCIDZVag1xfc=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/yaml.v2 v2.2.8 h1:obN1ZagJSUGI0Ek/LBmuj4SNLPfIny3KsKFopxRdj10=
gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

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// Copyright 2017 Google Inc. All Rights Reserved.
//
// 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
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// govanityurls serves Go vanity URLs.
package main
import (
"errors"
"fmt"
"html/template"
"net/http"
"sort"
"strings"
"gopkg.in/yaml.v2"
)
type handler struct {
host string
cacheControl string
paths pathConfigSet
}
type pathConfig struct {
path string
repo string
display string
vcs string
}
func newHandler(config []byte) (*handler, error) {
var parsed struct {
Host string `yaml:"host,omitempty"`
CacheAge *int64 `yaml:"cache_max_age,omitempty"`
Paths map[string]struct {
Repo string `yaml:"repo,omitempty"`
Display string `yaml:"display,omitempty"`
VCS string `yaml:"vcs,omitempty"`
} `yaml:"paths,omitempty"`
}
if err := yaml.Unmarshal(config, &parsed); err != nil {
return nil, err
}
h := &handler{host: parsed.Host}
cacheAge := int64(86400) // 24 hours (in seconds)
if parsed.CacheAge != nil {
cacheAge = *parsed.CacheAge
if cacheAge < 0 {
return nil, errors.New("cache_max_age is negative")
}
}
h.cacheControl = fmt.Sprintf("public, max-age=%d", cacheAge)
for path, e := range parsed.Paths {
pc := pathConfig{
path: strings.TrimSuffix(path, "/"),
repo: e.Repo,
display: e.Display,
vcs: e.VCS,
}
switch {
case e.Display != "":
// Already filled in.
case strings.HasPrefix(e.Repo, "https://github.com/"):
pc.display = fmt.Sprintf("%v %v/tree/master{/dir} %v/blob/master{/dir}/{file}#L{line}", e.Repo, e.Repo, e.Repo)
case strings.HasPrefix(e.Repo, "https://bitbucket.org"):
pc.display = fmt.Sprintf("%v %v/src/default{/dir} %v/src/default{/dir}/{file}#{file}-{line}", e.Repo, e.Repo, e.Repo)
}
switch {
case e.VCS != "":
// Already filled in.
if e.VCS != "bzr" && e.VCS != "git" && e.VCS != "hg" && e.VCS != "svn" {
return nil, fmt.Errorf("configuration for %v: unknown VCS %s", path, e.VCS)
}
case strings.HasPrefix(e.Repo, "https://github.com/"):
pc.vcs = "git"
default:
return nil, fmt.Errorf("configuration for %v: cannot infer VCS from %s", path, e.Repo)
}
h.paths = append(h.paths, pc)
}
sort.Sort(h.paths)
return h, nil
}
func (h *handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
current := r.URL.Path
pc, subpath := h.paths.find(current)
if pc == nil && current == "/" {
h.serveIndex(w, r)
return
}
if pc == nil {
http.NotFound(w, r)
return
}
w.Header().Set("Cache-Control", h.cacheControl)
if err := vanityTmpl.Execute(w, struct {
Import string
Subpath string
Repo string
Display string
VCS string
}{
Import: h.Host(r) + pc.path,
Subpath: subpath,
Repo: pc.repo,
Display: pc.display,
VCS: pc.vcs,
}); err != nil {
http.Error(w, "cannot render the page", http.StatusInternalServerError)
}
}
func (h *handler) serveIndex(w http.ResponseWriter, r *http.Request) {
host := h.Host(r)
handlers := make([]string, len(h.paths))
for i, h := range h.paths {
handlers[i] = host + h.path
}
if err := indexTmpl.Execute(w, struct {
Host string
Handlers []string
}{
Host: host,
Handlers: handlers,
}); err != nil {
http.Error(w, "cannot render the page", http.StatusInternalServerError)
}
}
func (h *handler) Host(r *http.Request) string {
host := h.host
if host == "" {
host = defaultHost(r)
}
return host
}
var indexTmpl = template.Must(template.New("index").Parse(`<!DOCTYPE html>
<html>
<h1>{{.Host}}</h1>
<ul>
{{range .Handlers}}<li><a href="https://pkg.go.dev/{{.}}">{{.}}</a></li>{{end}}
</ul>
</html>
`))
var vanityTmpl = template.Must(template.New("vanity").Parse(`<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<meta name="go-import" content="{{.Import}} {{.VCS}} {{.Repo}}">
<meta name="go-source" content="{{.Import}} {{.Display}}">
<meta http-equiv="refresh" content="0; url=https://pkg.go.dev/{{.Import}}/{{.Subpath}}">
</head>
<body>
Nothing to see here; <a href="https://pkg.go.dev/{{.Import}}/{{.Subpath}}">see the package on pkg.go.dev</a>.
</body>
</html>`))
type pathConfigSet []pathConfig
func (pset pathConfigSet) Len() int {
return len(pset)
}
func (pset pathConfigSet) Less(i, j int) bool {
return pset[i].path < pset[j].path
}
func (pset pathConfigSet) Swap(i, j int) {
pset[i], pset[j] = pset[j], pset[i]
}
func (pset pathConfigSet) find(path string) (pc *pathConfig, subpath string) {
// Fast path with binary search to retrieve exact matches
// e.g. given pset ["/", "/abc", "/xyz"], path "/def" won't match.
i := sort.Search(len(pset), func(i int) bool {
return pset[i].path >= path
})
if i < len(pset) && pset[i].path == path {
return &pset[i], ""
}
if i > 0 && strings.HasPrefix(path, pset[i-1].path+"/") {
return &pset[i-1], path[len(pset[i-1].path)+1:]
}
// Slow path, now looking for the longest prefix/shortest subpath i.e.
// e.g. given pset ["/", "/abc/", "/abc/def/", "/xyz"/]
// * query "/abc/foo" returns "/abc/" with a subpath of "foo"
// * query "/x" returns "/" with a subpath of "x"
lenShortestSubpath := len(path)
var bestMatchConfig *pathConfig
// After binary search with the >= lexicographic comparison,
// nothing greater than i will be a prefix of path.
max := i
for i := 0; i < max; i++ {
ps := pset[i]
if len(ps.path) >= len(path) {
// We previously didn't find the path by search, so any
// route with equal or greater length is NOT a match.
continue
}
sSubpath := strings.TrimPrefix(path, ps.path)
if len(sSubpath) < lenShortestSubpath {
subpath = sSubpath
lenShortestSubpath = len(sSubpath)
bestMatchConfig = &pset[i]
}
}
return bestMatchConfig, subpath
}

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// Copyright 2017 Google Inc. All Rights Reserved.
//
// 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
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package main
import (
"bytes"
"io/ioutil"
"net/http"
"net/http/httptest"
"sort"
"testing"
)
func TestHandler(t *testing.T) {
tests := []struct {
name string
config string
path string
goImport string
goSource string
}{
{
name: "explicit display",
config: "host: example.com\n" +
"paths:\n" +
" /portmidi:\n" +
" repo: https://github.com/rakyll/portmidi\n" +
" display: https://github.com/rakyll/portmidi _ _\n",
path: "/portmidi",
goImport: "example.com/portmidi git https://github.com/rakyll/portmidi",
goSource: "example.com/portmidi https://github.com/rakyll/portmidi _ _",
},
{
name: "display GitHub inference",
config: "host: example.com\n" +
"paths:\n" +
" /portmidi:\n" +
" repo: https://github.com/rakyll/portmidi\n",
path: "/portmidi",
goImport: "example.com/portmidi git https://github.com/rakyll/portmidi",
goSource: "example.com/portmidi https://github.com/rakyll/portmidi https://github.com/rakyll/portmidi/tree/master{/dir} https://github.com/rakyll/portmidi/blob/master{/dir}/{file}#L{line}",
},
{
name: "Bitbucket Mercurial",
config: "host: example.com\n" +
"paths:\n" +
" /gopdf:\n" +
" repo: https://bitbucket.org/zombiezen/gopdf\n" +
" vcs: hg\n",
path: "/gopdf",
goImport: "example.com/gopdf hg https://bitbucket.org/zombiezen/gopdf",
goSource: "example.com/gopdf https://bitbucket.org/zombiezen/gopdf https://bitbucket.org/zombiezen/gopdf/src/default{/dir} https://bitbucket.org/zombiezen/gopdf/src/default{/dir}/{file}#{file}-{line}",
},
{
name: "Bitbucket Git",
config: "host: example.com\n" +
"paths:\n" +
" /mygit:\n" +
" repo: https://bitbucket.org/zombiezen/mygit\n" +
" vcs: git\n",
path: "/mygit",
goImport: "example.com/mygit git https://bitbucket.org/zombiezen/mygit",
goSource: "example.com/mygit https://bitbucket.org/zombiezen/mygit https://bitbucket.org/zombiezen/mygit/src/default{/dir} https://bitbucket.org/zombiezen/mygit/src/default{/dir}/{file}#{file}-{line}",
},
{
name: "subpath",
config: "host: example.com\n" +
"paths:\n" +
" /portmidi:\n" +
" repo: https://github.com/rakyll/portmidi\n" +
" display: https://github.com/rakyll/portmidi _ _\n",
path: "/portmidi/foo",
goImport: "example.com/portmidi git https://github.com/rakyll/portmidi",
goSource: "example.com/portmidi https://github.com/rakyll/portmidi _ _",
},
{
name: "subpath with trailing config slash",
config: "host: example.com\n" +
"paths:\n" +
" /portmidi/:\n" +
" repo: https://github.com/rakyll/portmidi\n" +
" display: https://github.com/rakyll/portmidi _ _\n",
path: "/portmidi/foo",
goImport: "example.com/portmidi git https://github.com/rakyll/portmidi",
goSource: "example.com/portmidi https://github.com/rakyll/portmidi _ _",
},
}
for _, test := range tests {
h, err := newHandler([]byte(test.config))
if err != nil {
t.Errorf("%s: newHandler: %v", test.name, err)
continue
}
s := httptest.NewServer(h)
resp, err := http.Get(s.URL + test.path)
if err != nil {
s.Close()
t.Errorf("%s: http.Get: %v", test.name, err)
continue
}
data, err := ioutil.ReadAll(resp.Body)
resp.Body.Close()
s.Close()
if resp.StatusCode != http.StatusOK {
t.Errorf("%s: status code = %s; want 200 OK", test.name, resp.Status)
}
if err != nil {
t.Errorf("%s: ioutil.ReadAll: %v", test.name, err)
continue
}
if got := findMeta(data, "go-import"); got != test.goImport {
t.Errorf("%s: meta go-import = %q; want %q", test.name, got, test.goImport)
}
if got := findMeta(data, "go-source"); got != test.goSource {
t.Errorf("%s: meta go-source = %q; want %q", test.name, got, test.goSource)
}
}
}
func TestBadConfigs(t *testing.T) {
badConfigs := []string{
"paths:\n" +
" /missingvcs:\n" +
" repo: https://bitbucket.org/zombiezen/gopdf\n",
"paths:\n" +
" /unknownvcs:\n" +
" repo: https://bitbucket.org/zombiezen/gopdf\n" +
" vcs: xyzzy\n",
"cache_max_age: -1\n" +
"paths:\n" +
" /portmidi:\n" +
" repo: https://github.com/rakyll/portmidi\n",
}
for _, config := range badConfigs {
_, err := newHandler([]byte(config))
if err == nil {
t.Errorf("expected config to produce an error, but did not:\n%s", config)
}
}
}
func findMeta(data []byte, name string) string {
var sep []byte
sep = append(sep, `<meta name="`...)
sep = append(sep, name...)
sep = append(sep, `" content="`...)
i := bytes.Index(data, sep)
if i == -1 {
return ""
}
content := data[i+len(sep):]
j := bytes.IndexByte(content, '"')
if j == -1 {
return ""
}
return string(content[:j])
}
func TestPathConfigSetFind(t *testing.T) {
tests := []struct {
paths []string
query string
want string
subpath string
}{
{
paths: []string{"/portmidi"},
query: "/portmidi",
want: "/portmidi",
},
{
paths: []string{"/portmidi"},
query: "/portmidi/",
want: "/portmidi",
},
{
paths: []string{"/portmidi"},
query: "/foo",
want: "",
},
{
paths: []string{"/portmidi"},
query: "/zzz",
want: "",
},
{
paths: []string{"/abc", "/portmidi", "/xyz"},
query: "/portmidi",
want: "/portmidi",
},
{
paths: []string{"/abc", "/portmidi", "/xyz"},
query: "/portmidi/foo",
want: "/portmidi",
subpath: "foo",
},
{
paths: []string{"/example/helloworld", "/", "/y", "/foo"},
query: "/x",
want: "/",
subpath: "x",
},
{
paths: []string{"/example/helloworld", "/", "/y", "/foo"},
query: "/",
want: "/",
subpath: "",
},
{
paths: []string{"/example/helloworld", "/", "/y", "/foo"},
query: "/example",
want: "/",
subpath: "example",
},
{
paths: []string{"/example/helloworld", "/", "/y", "/foo"},
query: "/example/foo",
want: "/",
subpath: "example/foo",
},
{
paths: []string{"/example/helloworld", "/", "/y", "/foo"},
query: "/y",
want: "/y",
},
{
paths: []string{"/example/helloworld", "/", "/y", "/foo"},
query: "/x/y/",
want: "/",
subpath: "x/y/",
},
{
paths: []string{"/example/helloworld", "/y", "/foo"},
query: "/x",
want: "",
},
}
emptyToNil := func(s string) string {
if s == "" {
return "<nil>"
}
return s
}
for _, test := range tests {
pset := make(pathConfigSet, len(test.paths))
for i := range test.paths {
pset[i].path = test.paths[i]
}
sort.Sort(pset)
pc, subpath := pset.find(test.query)
var got string
if pc != nil {
got = pc.path
}
if got != test.want || subpath != test.subpath {
t.Errorf("pathConfigSet(%v).find(%q) = %v, %v; want %v, %v",
test.paths, test.query, emptyToNil(got), subpath, emptyToNil(test.want), test.subpath)
}
}
}
func TestCacheHeader(t *testing.T) {
tests := []struct {
name string
config string
cacheControl string
}{
{
name: "default",
cacheControl: "public, max-age=86400",
},
{
name: "specify time",
config: "cache_max_age: 60\n",
cacheControl: "public, max-age=60",
},
{
name: "zero",
config: "cache_max_age: 0\n",
cacheControl: "public, max-age=0",
},
}
for _, test := range tests {
h, err := newHandler([]byte("paths:\n /portmidi:\n repo: https://github.com/rakyll/portmidi\n" +
test.config))
if err != nil {
t.Errorf("%s: newHandler: %v", test.name, err)
continue
}
s := httptest.NewServer(h)
resp, err := http.Get(s.URL + "/portmidi")
if err != nil {
t.Errorf("%s: http.Get: %v", test.name, err)
continue
}
resp.Body.Close()
got := resp.Header.Get("Cache-Control")
if got != test.cacheControl {
t.Errorf("%s: Cache-Control header = %q; want %q", test.name, got, test.cacheControl)
}
}
}

55
cmd/m3o-go-url/main.go Normal file
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@@ -0,0 +1,55 @@
// Copyright 2017 Google Inc. All Rights Reserved.
//
// 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
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package main
import (
"io/ioutil"
"log"
"net/http"
"os"
)
func main() {
var configPath string
switch len(os.Args) {
case 1:
configPath = "vanity.yaml"
case 2:
configPath = os.Args[1]
default:
log.Fatal("usage: m3o-go-url [CONFIG]")
}
vanity, err := ioutil.ReadFile(configPath)
if err != nil {
log.Fatal(err)
}
h, err := newHandler(vanity)
if err != nil {
log.Fatal(err)
}
http.Handle("/", h)
port := os.Getenv("PORT")
if port == "" {
port = "8080"
}
if err := http.ListenAndServe(":"+port, nil); err != nil {
log.Fatal(err)
}
}
func defaultHost(r *http.Request) string {
return r.Host
}

5
cmd/m3o-go-url/vanity.yaml Normal file
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@@ -0,0 +1,5 @@
host: go.m3o.com
paths:
/:
repo: https://github.com/m3o/m3o-go