// 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 (
"fmt"
"html/template"
"net/http"
"strings"
"gopkg.in/yaml.v2"
)
type handler struct {
host string
m map[string]*struct {
Repo string `yaml:"repo,omitempty"`
Display string `yaml:"display,omitempty"`
VCS string `yaml:"vcs,omitempty"`
}
}
func newHandler(config []byte) (*handler, error) {
h := new(handler)
if err := yaml.Unmarshal(config, &h.m); err != nil {
return nil, err
}
for path, e := range h.m {
switch {
case e.Display != "":
// Already filled in.
case strings.HasPrefix(e.Repo, "https://github.com/"):
e.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"):
e.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/"):
e.VCS = "git"
default:
return nil, fmt.Errorf("configuration for %v: cannot infer VCS from %s", path, e.Repo)
}
}
return h, nil
}
func (h *handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
current := r.URL.Path
p, ok := h.m[current]
if !ok {
http.NotFound(w, r)
return
}
host := h.host
if host == "" {
host = requestHost(r)
}
if err := vanityTmpl.Execute(w, struct {
Import string
Repo string
Display string
VCS string
}{
Import: host + current,
Repo: p.Repo,
Display: p.Display,
VCS: p.VCS,
}); err != nil {
http.Error(w, "cannot render the page", http.StatusInternalServerError)
}
}
var vanityTmpl = template.Must(template.New("vanity").Parse(`
Nothing to see here; see the package on godoc.
`))