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// Copyright 2010 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// The /doc/codewalk/ tree is synthesized from codewalk descriptions,
// files named $GOROOT/doc/codewalk/*.xml.
// For an example and a description of the format, see
// http://golang.org/doc/codewalk/codewalk or run godoc -http=:6060
// and see http://localhost:6060/doc/codewalk/codewalk .
// That page is itself a codewalk; the source code for it is
// $GOROOT/doc/codewalk/codewalk.xml.
package main
import (
"encoding/json"
"go/format"
"log"
"net/http"
"strings"
"text/template"
"golang.org/x/tools/godoc"
"golang.org/x/tools/godoc/env"
"golang.org/x/tools/godoc/redirect"
"golang.org/x/tools/godoc/vfs"
)
var (
pres *godoc.Presentation
fs = vfs.NameSpace{}
)
// hostEnforcerHandler redirects requests to "http://foo.golang.org/bar"
// to "https://golang.org/bar".
// It permits requests to the host "godoc-test.golang.org" for testing and
// golang.google.cn for Chinese users.
type hostEnforcerHandler struct {
h http.Handler
}
func (h hostEnforcerHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
if !env.EnforceHosts() {
h.h.ServeHTTP(w, r)
return
}
if !h.isHTTPS(r) || !h.validHost(r.Host) {
r.URL.Scheme = "https"
if h.validHost(r.Host) {
r.URL.Host = r.Host
} else {
r.URL.Host = "golang.org"
}
http.Redirect(w, r, r.URL.String(), http.StatusFound)
return
}
w.Header().Set("Strict-Transport-Security", "max-age=31536000; includeSubDomains; preload")
h.h.ServeHTTP(w, r)
}
func (h hostEnforcerHandler) isHTTPS(r *http.Request) bool {
return r.TLS != nil || r.Header.Get("X-Forwarded-Proto") == "https"
}
func (h hostEnforcerHandler) validHost(host string) bool {
switch strings.ToLower(host) {
case "golang.org", "golang.google.cn":
return true
}
if strings.HasSuffix(host, "-dot-golang-org.appspot.com") {
// staging/test
return true
}
return false
}
func registerHandlers(pres *godoc.Presentation) *http.ServeMux {
if pres == nil {
panic("nil Presentation")
}
mux := http.NewServeMux()
mux.HandleFunc("/doc/codewalk/", codewalk)
mux.Handle("/doc/play/", pres.FileServer())
mux.Handle("/robots.txt", pres.FileServer())
mux.Handle("/", pres)
mux.Handle("/pkg/C/", redirect.Handler("/cmd/cgo/"))
mux.HandleFunc("/fmt", fmtHandler)
redirect.Register(mux)
http.Handle("/", hostEnforcerHandler{mux})
return mux
}
func readTemplate(name string) *template.Template {
if pres == nil {
panic("no global Presentation set yet")
}
path := "lib/godoc/" + name
// use underlying file system fs to read the template file
// (cannot use template ParseFile functions directly)
data, err := vfs.ReadFile(fs, path)
if err != nil {
log.Fatal("readTemplate: ", err)
}
// be explicit with errors (for app engine use)
t, err := template.New(name).Funcs(pres.FuncMap()).Parse(string(data))
if err != nil {
log.Fatal("readTemplate: ", err)
}
return t
}
func readTemplates(p *godoc.Presentation) {
codewalkHTML = readTemplate("codewalk.html")
codewalkdirHTML = readTemplate("codewalkdir.html")
p.CallGraphHTML = readTemplate("callgraph.html")
p.DirlistHTML = readTemplate("dirlist.html")
p.ErrorHTML = readTemplate("error.html")
p.ExampleHTML = readTemplate("example.html")
p.GodocHTML = readTemplate("godoc.html")
p.ImplementsHTML = readTemplate("implements.html")
p.MethodSetHTML = readTemplate("methodset.html")
p.PackageHTML = readTemplate("package.html")
p.PackageRootHTML = readTemplate("packageroot.html")
p.SearchHTML = readTemplate("search.html")
p.SearchDocHTML = readTemplate("searchdoc.html")
p.SearchCodeHTML = readTemplate("searchcode.html")
p.SearchTxtHTML = readTemplate("searchtxt.html")
p.SearchDescXML = readTemplate("opensearch.xml")
}
type fmtResponse struct {
Body string
Error string
}
// fmtHandler takes a Go program in its "body" form value, formats it with
// standard gofmt formatting, and writes a fmtResponse as a JSON object.
func fmtHandler(w http.ResponseWriter, r *http.Request) {
resp := new(fmtResponse)
body, err := format.Source([]byte(r.FormValue("body")))
if err != nil {
resp.Error = err.Error()
} else {
resp.Body = string(body)
}
w.Header().Set("Content-type", "application/json; charset=utf-8")
json.NewEncoder(w).Encode(resp)
}
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