all: support /r

For #4

README.md

@@ -22,13 +22,14 @@ if exist. The website itself will redirect the request to [pkg.go.dev](https://p
 There is a reserved ping router for debugging purpose `/x/.ping` which will
 give you a pong.
 
-### 2. Redirect `golang.design/s/alias`
+### 2. Redirect `golang.design/s/alias` and `golang.design/r/randstr`
 
 The served alias can be allocated by [golang.design](https://golang.design/) members.
 The current approach is to use `redir` command on the [golang.design](https://golang.design/)
 server. Here is the overview of its usage:
 
 ```
+$ redir
 usage: redir [-s] [-f <file>] [-op <operator> -a <alias> -l <link>]
 options:
   -a string
@@ -42,8 +43,9 @@ options:
   -s    run redir service
 example:
 redir -s                  run the redir service
-redir -f ./import.yml       import aliases from a file
+redir -f ./import.yml     import aliases from a file
 redir -a alias -l link    allocate new short link if possible
+redir -l link             allocate a random alias for the given link if possible
 redir -op fetch -a alias  fetch alias information
 ```
 
@@ -52,32 +54,42 @@ The command will talk to the Redis data store and issue a new allocated alias.
 For instance, the following command:
 
 ```
-redir -a changkun -l https://changkun.de
+$ redir -a changkun -l https://changkun.de
+https://golang.design/s/changkun
 ```
 
 creates a new alias under [golang.design/s/changkun](https://golang.design/s/changkun).
 
+If the `-a` is not provided, then redir command will generate a random string as an alias, but the link can only be accessed under `/r/alias`. For instance:
+
+```
+$ redir -l https://changkun.de
+https://golang.design/r/qFlKSP
+```
+
+creates a new alias under [golang.design/r/qFlKSP](https://golang.design/r/qFlKSP).
+
 Import from a YAML file is also possible, for instance:
 
 ```
-redir -f import.yml
+$ redir -f import.yml
 ```
 
 The aliases are either imported as a new alias or updated for an existing alias.
 
-Moreover, it is possible to visit [`/s`](https://golang.design/s) directly listing all exist aliases under [golang.design](https://golang.design/).
+Moreover, it is possible to visit [`/s`](https://golang.design/s) or [`/r`](https://golang.design/r) directly listing all exist aliases under [golang.design](https://golang.design/).
 
 ## Build
 
 `Makefile` defines different ways to build the service:
 
 ```bash
-make       # build native binary
-make run   # assume your local redis is running
-make build # build docker images
-make up    # run via docker-compose
-make down  # remove compose stuff
-make clean # cleanup
+$ make       # build native binary
+$ make run   # assume your local redis is running
+$ make build # build docker images
+$ make up    # run via docker-compose
+$ make down  # remove compose stuff
+$ make clean # cleanup
 ```
 
 ## Troubleshooting

config.go

@@ -31,6 +31,10 @@ type config struct {
 	S         struct {
 		Prefix string `yaml:"prefix"`
 	} `yaml:"s"`
+	R struct {
+		Length int    `yaml:"length"`
+		Prefix string `yaml:"prefix"`
+	} `yaml:"r"`
 	X struct {
 		Prefix     string `yaml:"prefix"`
 		VCS        string `yaml:"vcs"`

config.yml

@@ -12,6 +12,9 @@ backup_dir: ./data/backup
 log: "golang.design/redir: "
 s:
   prefix: /s/
+r:
+  length: 6
+  prefix: /r/
 x:
   prefix: /x/
   vcs: git

data/container.yml

@@ -3,7 +3,7 @@
 # by a MIT license that can be found in the LICENSE file.
 
 ---
-title: The golang.design Initiative
+title: "The golang.design Initiative"
 host: https://golang.design
 addr: :8080
 store: redis://redis:6379/9
@@ -12,18 +12,13 @@ backup_dir: ./data/backup
 log: "golang.design/redir: "
 s:
   prefix: /s/
+r:
+  length: 6
+  prefix: /r/
 x:
   prefix: /x/
   vcs: git
   import_path: golang.design/x/*
   repo_path: https://github.com/golang-design/*
   godoc_host: https://pkg.go.dev/
-google_analytics: |
-  <!-- Global site tag (gtag.js) - Google Analytics -->
-  <script async src="https://www.googletagmanager.com/gtag/js?id=UA-80889616-4"></script>
-  <script>
-  window.dataLayer = window.dataLayer || [];
-  function gtag(){dataLayer.push(arguments);}
-  gtag('js', new Date());
-  gtag('config', 'UA-80889616-4');
-  </script>
+google_analytics: UA-80889616-4

db.go

@@ -23,10 +23,18 @@ var (
 	errExistedAlias = errors.New("alias is existed")
 )
 
+type aliasKind int
+
+const (
+	kindShort aliasKind = iota
+	kindRandom
+)
+
 // arecord indicates an alias record that stores an short alias
 // in data store with statistics regarding its UVs and PVs.
 type arecord struct {
 	Alias     string    `json:"alias"`
+	Kind      aliasKind `json:"kind"`
 	URL       string    `json:"url"`
 	UV        uint64    `json:"uv"`
 	PV        uint64    `json:"pv"`
@@ -69,9 +77,9 @@ func (s *store) Close() (err error) {
 }
 
 // StoreAlias stores a given short alias with the given link if not exists
-func (s *store) StoreAlias(ctx context.Context, a, l string) (err error) {
+func (s *store) StoreAlias(ctx context.Context, a, l string, kind aliasKind) (err error) {
 	b, err := json.Marshal(&arecord{
-		URL: l, Alias: a, PV: 0, UV: 0,
+		URL: l, Kind: kind, Alias: a, PV: 0, UV: 0,
 		CreatedAt: time.Now().UTC(),
 		UpdatedAt: time.Now().UTC(),
 	})

db_test.go

@@ -20,7 +20,7 @@ func prepare(ctx context.Context, t *testing.T) *store {
 		t.Fatalf("cannot connect to data store")
 	}
 
-	err = s.StoreAlias(ctx, kalias, "link")
+	err = s.StoreAlias(ctx, kalias, "link", kindShort)
 	if err != nil {
 		t.Fatalf("cannot store alias to data store, err: %v\n", err)
 	}

handler.go

@@ -72,7 +72,8 @@ func (s *server) registerHandler() {
 	})
 
 	// short redirector
-	http.HandleFunc(conf.S.Prefix, s.sHandler)
+	http.HandleFunc(conf.S.Prefix, s.shortHandler(kindShort))
+	http.HandleFunc(conf.R.Prefix, s.shortHandler(kindRandom))
 	// repo redirector
 	http.Handle(conf.X.Prefix, s.xHandler(conf.X.VCS, conf.X.ImportPath, conf.X.RepoPath))
 }

import.yml

@@ -1,2 +1,5 @@
 ---
-changkun: https://changkun.de/
+short:
+  changkun: https://changkun.de
+random:
+  - https://to.what.ever

public/stats.html

@@ -1,7 +1,14 @@
 <!DOCTYPE html>
 <html lang="en">
 <head>
-  {{ .GoogleAnalytics }}
+  <!-- Global site tag (gtag.js) - Google Analytics -->
+  <script async src="https://www.googletagmanager.com/gtag/js?id={{ .GoogleAnalytics }}"></script>
+  <script>
+  window.dataLayer = window.dataLayer || [];
+  function gtag(){dataLayer.push(arguments);}
+  gtag('js', new Date());
+  gtag('config', '{{ .GoogleAnalytics }}');
+</script>
   <meta charset="UTF-8">
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <title>{{.Title}}</title>
@@ -67,7 +74,7 @@ <h5><a href="https://github.com/golang-design/redir">An alias request redirector
     {{range .Records}}
     <tr>
       <td>{{ .PV }}/{{ .UV }}</td>
-      <td><a href="{{ $.Host }}/s/{{ .Alias }}">{{ $.Host }}/s/{{ .Alias }}</a></td>
+      <td><a href="{{ $.Host }}{{ $.Prefix }}{{ .Alias }}">{{ $.Host }}{{ $.Prefix }}{{ .Alias }}</a></td>
     </tr>
     {{end}}
   </table>

public/x.html

@@ -14,7 +14,7 @@
 </head><body>
 <h1>{{.ImportRoot}}{{.Suffix}}</h1>
 <ul>
-<li>Source: <a href="https://pkg.go.dev/{{.ImportRoot}}{{.Suffix}}">pkg.go.dev/{{.ImportRoot}}{{.Suffix}}</a></li>
+<li>Source: <a href="{{.VCSRoot}}">{{.VCSRoot}}</a></li>
 <li>Doc: <a href="https://pkg.go.dev/{{.ImportRoot}}{{.Suffix}}">pkg.go.dev/{{.ImportRoot}}{{.Suffix}}</a></li>
 </ul>
 </body></html>

redir.go

@@ -33,6 +33,7 @@ examples:
 redir -s                  run the redir service
 redir -f ./import.yml     import aliases from a file
 redir -a alias -l link    allocate new short link if possible
+redir -l link             allocate a random alias for the given link if possible
 redir -op fetch -a alias  fetch alias information
 `)
 	os.Exit(2)
@@ -77,12 +78,12 @@ func runCmd() {
 	}
 
 	switch o := op(*operate); o {
-	case opCreate, opUpdate:
-		if *alias == "" || *link == "" {
+	case opCreate:
+		if *link == "" {
 			flag.Usage()
 			return
 		}
-	case opDelete, opFetch:
+	case opUpdate, opDelete, opFetch:
 		if *alias == "" {
 			flag.Usage()
 			return