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// Copyright (C) 2015 The Android Open Source Project
//
// 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 (
"bufio"
"compress/gzip"
"encoding/json"
"errors"
"flag"
"io"
"io/ioutil"
"log"
"net"
"net/http"
"net/url"
"regexp"
"strings"
)
var (
restHost = flag.String("host", "gerrit-review.googlesource.com", "Host to proxy requests to")
port = flag.String("port", ":8081", "Port to serve HTTP requests on")
prod = flag.Bool("prod", false, "Serve production assets")
scheme = flag.String("scheme", "https", "URL scheme")
plugins = flag.String("plugins", "", "Path to local plugins folder")
)
func main() {
flag.Parse()
if *prod {
http.Handle("/", http.FileServer(http.Dir("dist")))
} else {
http.Handle("/", http.FileServer(http.Dir("app")))
}
http.HandleFunc("/changes/", handleRESTProxy)
http.HandleFunc("/accounts/", handleRESTProxy)
http.HandleFunc("/config/", handleRESTProxy)
http.HandleFunc("/projects/", handleRESTProxy)
http.HandleFunc("/accounts/self/detail", handleAccountDetail)
if len(*plugins) > 0 {
http.Handle("/plugins/", http.StripPrefix("/plugins/",
http.FileServer(http.Dir(*plugins))))
log.Println("Local plugins from", *plugins)
} else {
http.HandleFunc("/plugins/", handleRESTProxy)
}
log.Println("Serving on port", *port)
log.Fatal(http.ListenAndServe(*port, &server{}))
}
func handleRESTProxy(w http.ResponseWriter, r *http.Request) {
if strings.HasSuffix(r.URL.Path, ".html") {
w.Header().Set("Content-Type", "text/html")
} else if strings.HasSuffix(r.URL.Path, ".css") {
w.Header().Set("Content-Type", "text/css")
} else {
w.Header().Set("Content-Type", "application/json")
}
req := &http.Request{
Method: "GET",
URL: &url.URL{
Scheme: *scheme,
Host: *restHost,
Opaque: r.URL.EscapedPath(),
RawQuery: r.URL.RawQuery,
},
}
res, err := http.DefaultClient.Do(req)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
defer res.Body.Close()
w.WriteHeader(res.StatusCode)
if _, err := io.Copy(w, patchResponse(r, res)); err != nil {
log.Println("Error copying response to ResponseWriter:", err)
return
}
}
func getJsonPropByPath(json map[string]interface{}, path []string) interface{} {
prop, path := path[0], path[1:]
if json[prop] == nil {
return nil
}
switch json[prop].(type) {
case map[string]interface{}: // map
return getJsonPropByPath(json[prop].(map[string]interface{}), path)
case []interface{}: // array
return json[prop].([]interface{})
default:
return json[prop].(interface{})
}
}
func setJsonPropByPath(json map[string]interface{}, path []string, value interface{}) {
prop, path := path[0], path[1:]
if json[prop] == nil {
return // path not found
}
if len(path) > 0 {
setJsonPropByPath(json[prop].(map[string]interface{}), path, value)
} else {
json[prop] = value
}
}
func patchResponse(r *http.Request, res *http.Response) io.Reader {
switch r.URL.EscapedPath() {
case "/config/server/info":
return injectLocalPlugins(res.Body)
default:
return res.Body
}
}
func injectLocalPlugins(r io.Reader) io.Reader {
if len(*plugins) == 0 {
return r
}
// Skip escape prefix
io.CopyN(ioutil.Discard, r, 5)
dec := json.NewDecoder(r)
var response map[string]interface{}
err := dec.Decode(&response)
if err != nil {
log.Fatal(err)
}
// Configuration path in the JSON server response
pluginsPath := []string{"plugin", "html_resource_paths"}
htmlResources := getJsonPropByPath(response, pluginsPath).([]interface{})
files, err := ioutil.ReadDir(*plugins)
if err != nil {
log.Fatal(err)
}
for _, f := range files {
if strings.HasSuffix(f.Name(), ".html") {
htmlResources = append(htmlResources, "plugins/"+f.Name())
}
}
setJsonPropByPath(response, pluginsPath, htmlResources)
reader, writer := io.Pipe()
go func() {
defer writer.Close()
io.WriteString(writer, ")]}'") // Write escape prefix
err := json.NewEncoder(writer).Encode(&response)
if err != nil {
log.Fatal(err)
}
}()
return reader
}
func handleAccountDetail(w http.ResponseWriter, r *http.Request) {
http.Error(w, http.StatusText(http.StatusForbidden), http.StatusForbidden)
}
type gzipResponseWriter struct {
io.WriteCloser
http.ResponseWriter
}
func newGzipResponseWriter(w http.ResponseWriter) *gzipResponseWriter {
gz := gzip.NewWriter(w)
return &gzipResponseWriter{WriteCloser: gz, ResponseWriter: w}
}
func (w gzipResponseWriter) Write(b []byte) (int, error) {
return w.WriteCloser.Write(b)
}
func (w gzipResponseWriter) Hijack() (net.Conn, *bufio.ReadWriter, error) {
h, ok := w.ResponseWriter.(http.Hijacker)
if !ok {
return nil, nil, errors.New("gzipResponseWriter: ResponseWriter does not satisfy http.Hijacker interface")
}
return h.Hijack()
}
type server struct{}
// Any path prefixes that should resolve to index.html.
var (
fePaths = []string{"/q/", "/c/", "/dashboard/"}
issueNumRE = regexp.MustCompile(`^\/\d+\/?$`)
)
func (_ *server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
log.Printf("%s %s %s %s\n", r.Proto, r.Method, r.RemoteAddr, r.URL)
for _, prefix := range fePaths {
if strings.HasPrefix(r.URL.Path, prefix) {
r.URL.Path = "/"
log.Println("Redirecting to /")
break
} else if match := issueNumRE.Find([]byte(r.URL.Path)); match != nil {
r.URL.Path = "/"
log.Println("Redirecting to /")
break
}
}
if !strings.Contains(r.Header.Get("Accept-Encoding"), "gzip") {
http.DefaultServeMux.ServeHTTP(w, r)
return
}
w.Header().Set("Content-Encoding", "gzip")
gzw := newGzipResponseWriter(w)
defer gzw.Close()
http.DefaultServeMux.ServeHTTP(gzw, r)
}