2017-07-05 22:46:56 +02:00
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// Copyright 2017 Google Inc. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// govanityurls serves Go vanity URLs.
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package main
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import (
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"fmt"
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"html/template"
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"net/http"
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2017-07-07 22:21:37 +02:00
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"sort"
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2017-07-05 22:46:56 +02:00
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"strings"
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"gopkg.in/yaml.v2"
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)
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type handler struct {
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host string
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paths pathConfigSet
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}
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type pathConfig struct {
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path string
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repo string
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display string
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vcs string
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}
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func newHandler(config []byte) (*handler, error) {
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var parsed struct {
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Host string `yaml:"host,omitempty"`
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Paths map[string]struct {
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Repo string `yaml:"repo,omitempty"`
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Display string `yaml:"display,omitempty"`
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VCS string `yaml:"vcs,omitempty"`
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} `yaml:"paths,omitempty"`
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}
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if err := yaml.Unmarshal(config, &parsed); err != nil {
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return nil, err
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}
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h := &handler{host: parsed.Host}
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for path, e := range parsed.Paths {
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pc := pathConfig{
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path: strings.TrimSuffix(path, "/"),
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repo: e.Repo,
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display: e.Display,
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vcs: e.VCS,
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}
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switch {
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case e.Display != "":
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// Already filled in.
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case strings.HasPrefix(e.Repo, "https://github.com/"):
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pc.display = fmt.Sprintf("%v %v/tree/master{/dir} %v/blob/master{/dir}/{file}#L{line}", e.Repo, e.Repo, e.Repo)
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case strings.HasPrefix(e.Repo, "https://bitbucket.org"):
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pc.display = fmt.Sprintf("%v %v/src/default{/dir} %v/src/default{/dir}/{file}#{file}-{line}", e.Repo, e.Repo, e.Repo)
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}
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switch {
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case e.VCS != "":
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// Already filled in.
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if e.VCS != "bzr" && e.VCS != "git" && e.VCS != "hg" && e.VCS != "svn" {
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return nil, fmt.Errorf("configuration for %v: unknown VCS %s", path, e.VCS)
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}
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case strings.HasPrefix(e.Repo, "https://github.com/"):
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pc.vcs = "git"
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default:
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return nil, fmt.Errorf("configuration for %v: cannot infer VCS from %s", path, e.Repo)
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}
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h.paths = append(h.paths, pc)
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}
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sort.Sort(h.paths)
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return h, nil
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}
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func (h *handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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current := r.URL.Path
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pc, _ := h.paths.find(current)
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if pc == nil {
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http.NotFound(w, r)
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return
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}
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host := h.host
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if host == "" {
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host = defaultHost(r)
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}
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if err := vanityTmpl.Execute(w, struct {
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Import string
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Repo string
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Display string
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VCS string
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}{
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Import: host + pc.path,
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Repo: pc.repo,
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Display: pc.display,
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VCS: pc.vcs,
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}); err != nil {
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http.Error(w, "cannot render the page", http.StatusInternalServerError)
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}
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}
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var vanityTmpl = template.Must(template.New("vanity").Parse(`<!DOCTYPE html>
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
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<meta name="go-import" content="{{.Import}} {{.VCS}} {{.Repo}}">
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<meta name="go-source" content="{{.Import}} {{.Display}}">
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<meta http-equiv="refresh" content="0; url=https://godoc.org/{{.Import}}">
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</head>
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<body>
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Nothing to see here; <a href="https://godoc.org/{{.Import}}">see the package on godoc</a>.
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</body>
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</html>`))
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type pathConfigSet []pathConfig
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func (pset pathConfigSet) Len() int {
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return len(pset)
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}
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func (pset pathConfigSet) Less(i, j int) bool {
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return pset[i].path < pset[j].path
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}
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func (pset pathConfigSet) Swap(i, j int) {
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pset[i], pset[j] = pset[j], pset[i]
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}
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func (pset pathConfigSet) find(path string) (pc *pathConfig, subpath string) {
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i := sort.Search(len(pset), func(i int) bool {
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return pset[i].path >= path
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})
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if i < len(pset) && pset[i].path == path {
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return &pset[i], ""
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}
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if i > 0 && strings.HasPrefix(path, pset[i-1].path+"/") {
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return &pset[i-1], path[len(pset[i-1].path)+1:]
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}
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return nil, ""
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}
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