// Copyright 2015 The Crashpad Authors
//
// 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
import (
"encoding/base64"
"fmt"
"io"
"io/ioutil"
"net/http"
"net/url"
"path"
"strings"
"time"
"google.golang.org/appengine/v2"
"google.golang.org/appengine/v2/memcache"
"google.golang.org/appengine/v2/urlfetch"
)
func main() {
appengine.Main()
}
func init() {
http.HandleFunc("/", handler)
}
func handler(w http.ResponseWriter, r *http.Request) {
const (
baseURL = "https://chromium.googlesource.com/crashpad/crashpad/+/"
mainBaseURL = baseURL + "main/"
generatedDocBaseURL = baseURL + "doc/doc/generated/?format=TEXT"
bugBaseURL = "https://bugs.chromium.org/p/crashpad/"
)
redirectMap := map[string]string{
"/": mainBaseURL + "README.md",
"/bug": bugBaseURL,
"/bug/": bugBaseURL,
"/bug/new": bugBaseURL + "issues/entry",
"/doc/developing.html": mainBaseURL + "/doc/developing.md",
"/doc/status.html": mainBaseURL + "/doc/status.md",
"/index.html": mainBaseURL + "README.md",
"/man": mainBaseURL + "doc/man.md",
"/man/": mainBaseURL + "doc/man.md",
"/man/catch_exception_tool.html": mainBaseURL + "tools/mac/catch_exception_tool.md",
"/man/crashpad_database_util.html": mainBaseURL + "tools/crashpad_database_util.md",
"/man/crashpad_handler.html": mainBaseURL + "handler/crashpad_handler.md",
"/man/exception_port_tool.html": mainBaseURL + "tools/mac/exception_port_tool.md",
"/man/generate_dump.html": mainBaseURL + "tools/generate_dump.md",
"/man/index.html": mainBaseURL + "doc/man.md",
"/man/on_demand_service_tool.html": mainBaseURL + "tools/mac/on_demand_service_tool.md",
"/man/run_with_crashpad.html": mainBaseURL + "tools/run_with_crashpad.md",
}
ctx := appengine.NewContext(r)
client := urlfetch.Client(ctx)
destinationURL, exists := redirectMap[r.URL.Path]
if exists {
http.Redirect(w, r, destinationURL, http.StatusFound)
return
}
if strings.HasPrefix(r.URL.Path, "/bug/") {
http.Redirect(w, r, bugBaseURL+"issues/detail?id="+r.URL.Path[5:], http.StatusFound)
return
}
// Don’t show dotfiles.
if strings.HasPrefix(path.Base(r.URL.Path), ".") {
http.Error(w, http.StatusText(http.StatusNotFound), http.StatusNotFound)
return
}
u, err := url.Parse(generatedDocBaseURL)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
u.Path = path.Join(u.Path, r.URL.Path)
urlStr := u.String()
item, err := memcache.Get(ctx, urlStr)
if err == memcache.ErrCacheMiss {
resp, err := client.Get(urlStr)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
w.WriteHeader(resp.StatusCode)
for k, v := range w.Header() {
w.Header()[k] = v
}
io.Copy(w, resp.Body)
return
}
// Redirect directories to their index pages (/doc/ -> /doc/index.html).
if resp.Header.Get("X-Gitiles-Object-Type") == "tree" {
http.Redirect(w, r, path.Join(r.URL.Path, "/index.html"), http.StatusFound)
return
}
decoder := base64.NewDecoder(base64.StdEncoding, resp.Body)
b, err := ioutil.ReadAll(decoder)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
item = &memcache.Item{
Key: urlStr,
Value: b,
Expiration: 1 * time.Hour,
}
if err := memcache.Set(ctx, item); err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
} else if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
w.Header().Set("Content-Type", contentType(path.Base(u.Path)))
fmt.Fprintf(w, "%s", item.Value)
}
// contentType returns the appropriate content type header for file.
func contentType(file string) string {
contentTypes := map[string]string{
".html": "text/html; charset=UTF-8",
".css": "text/css; charset=UTF-8",
".js": "text/javascript; charset=UTF-8",
".png": "image/png",
".ico": "image/x-icon",
}
for suffix, typ := range contentTypes {
if strings.HasSuffix(file, suffix) {
return typ
}
}
return "text/plain; charset=UTF-8"
}