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GoogleCloudPlatform · Jun 24, 2017 · 0bb8dfd · 0bb8dfd
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diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
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+# How to Contribute
+
+We'd love to accept your patches and contributions to this project. There are
+just a few small guidelines you need to follow.
+
+## Contributor License Agreement
+
+Contributions to this project must be accompanied by a Contributor License
+Agreement. You (or your employer) retain the copyright to your contribution,
+this simply gives us permission to use and redistribute your contributions as
+part of the project. Head over to <https://cla.developers.google.com/> to see
+your current agreements on file or to sign a new one.
+
+You generally only need to submit a CLA once, so if you've already submitted one
+(even if it was for a different project), you probably don't need to do it
+again.
+
+## Code reviews
+
+All submissions, including submissions by project members, require review. We
+use GitHub pull requests for this purpose. Consult
+[GitHub Help](https://help.github.com/articles/about-pull-requests/) for more
+information on using pull requests.
diff --git a/README.md b/README.md
@@ -0,0 +1,26 @@
+# Go Vanity URLs
+
+Go Vanity URLs is a simple App Engine Go app that allows you
+to set custom import paths for your Go packages.
+
+## Quickstart
+
+Get the application:
+```
+go get -u -d github.com/GoogleCloudPlatform/govanityurls
+cd $(go env GOPATH)/github.com/GoogleCloudPlatform/govanityurls
+```
+
+Edit `app.yaml` with your domain and git repo information.
+
+```
+env_variables:
+  DOMAIN: go.grpcutil.org
+  REPO: https://github.com/rakyll/grpcutil
+```
+
+Deploy the app:
+
+```
+$ gcloud app deploy
+```
diff --git a/app.yaml b/app.yaml
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+runtime: go
+api_version: go1
+
+handlers:
+- url: /.*
+  script: _go_app
+
+env_variables:
+  DOMAIN: portmidigo.org
+  REPO: https://github.com/rakyll/portmidi
diff --git a/main.go b/main.go
@@ -0,0 +1,83 @@
+// 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 contains an App Engine that serves vanity URLs for a git repo.
+package main
+
+import (
+	"fmt"
+	"html/template"
+	"log"
+	"net/http"
+	"os"
+	"strings"
+)
+
+type pkg struct {
+	Import     string
+	Repo       string
+	Display    string
+	CurrentPkg string
+}
+
+var (
+	domain  string
+	repo    string
+	display string
+)
+
+func init() {
+	mustLoad("DOMAIN", &domain)
+	mustLoad("REPO", &repo)
+	if strings.Contains(repo, "github.com") {
+		display = fmt.Sprintf("%v %v/tree/master{/dir} %v/blob/master{/dir}/{file}#L{line}", repo, repo, repo)
+	}
+	if display == "" {
+		mustLoad("DISPLAY", &display)
+	}
+	http.HandleFunc("/", handle)
+}
+
+func handle(w http.ResponseWriter, r *http.Request) {
+	current := r.URL.Path
+	if err := vanityTmpl.Execute(w, &pkg{
+		Import:     domain,
+		Repo:       repo,
+		Display:    display,
+		CurrentPkg: current,
+	}); err != nil {
+		http.Error(w, "cannot render the page", http.StatusInternalServerError)
+	}
+}
+
+var vanityTmpl, _ = 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}} git {{.Repo}}">
+<meta name="go-source" content="{{.Import}} {{.Display}}">
+<meta http-equiv="refresh" content="0; url=https://godoc.org/{{.Import}}{{.CurrentPkg}}">
+</head>
+<body>
+Nothing to see here; <a href="https://godoc.org/{{.Import}}{{.CurrentPkg}}">move along</a>.
+</body>
+</html>`)
+
+func mustLoad(key string, value *string) {
+	v := os.Getenv(key)
+	if v == "" {
+		log.Fatalf("missing %v env variable", key)
+	}
+	*value = v
+}