polygerrit-ui/server.go - gerrit - Git at Google

 // 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"
 	"github.com/robfig/soy"
 	"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", "", "comma seperated plugin paths to serve")

 	tofu, _ = soy.NewBundle().
 		AddTemplateFile("../resources/com/google/gerrit/httpd/raw/PolyGerritIndexHtml.soy").
 		CompileToTofu()
 )

 func main() {
 	flag.Parse()

 	http.HandleFunc("/index.html", handleIndex)

 	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 handleIndex(w http.ResponseWriter, r *http.Request) {
 	var obj = map[string]interface{}{
 		"canonicalPath":      "",
 		"staticResourcePath": "",
 	}
 	w.Header().Set("Content-Type", "text/html")
 	tofu.Render(w, "com.google.gerrit.httpd.raw.Index", obj)
 }

 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
 	jsPluginsPath := []string{"plugin", "js_resource_paths"}
 	htmlPluginsPath := []string{"plugin", "html_resource_paths"}
 	htmlResources := getJsonPropByPath(response, htmlPluginsPath).([]interface{})
 	jsResources := getJsonPropByPath(response, jsPluginsPath).([]interface{})

 	for _, p := range strings.Split(*plugins, ",") {
 		if strings.HasSuffix(p, ".html") {
 			htmlResources = append(htmlResources, p)
 		}

 		if strings.HasSuffix(p, ".js") {
 			jsResources = append(jsResources, p)
 		}
 	}

 	setJsonPropByPath(response, jsPluginsPath, jsResources)
 	setJsonPropByPath(response, htmlPluginsPath, 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/", "/p/", "/x/", "/dashboard/", "/admin/"}
 	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 == "/" {
 			r.URL.Path = "/index.html"
 			log.Println("Redirecting to /index.html")
 			break
 		} else if match := issueNumRE.Find([]byte(r.URL.Path)); match != nil {
 			r.URL.Path = "/index.html"
 			log.Println("Redirecting to /index.html")
 			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)
 }
	// 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"
	"github.com/robfig/soy"
	"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", "", "comma seperated plugin paths to serve")

	tofu, _ = soy.NewBundle().
	AddTemplateFile("../resources/com/google/gerrit/httpd/raw/PolyGerritIndexHtml.soy").
	CompileToTofu()
	)

	func main() {
	flag.Parse()

	http.HandleFunc("/index.html", handleIndex)

	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 handleIndex(w http.ResponseWriter, r *http.Request) {
	var obj = map[string]interface{}{
	"canonicalPath": "",
	"staticResourcePath": "",
	}
	w.Header().Set("Content-Type", "text/html")
	tofu.Render(w, "com.google.gerrit.httpd.raw.Index", obj)
	}

	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
	jsPluginsPath := []string{"plugin", "js_resource_paths"}
	htmlPluginsPath := []string{"plugin", "html_resource_paths"}
	htmlResources := getJsonPropByPath(response, htmlPluginsPath).([]interface{})
	jsResources := getJsonPropByPath(response, jsPluginsPath).([]interface{})

	for _, p := range strings.Split(*plugins, ",") {
	if strings.HasSuffix(p, ".html") {
	htmlResources = append(htmlResources, p)
	}

	if strings.HasSuffix(p, ".js") {
	jsResources = append(jsResources, p)
	}
	}

	setJsonPropByPath(response, jsPluginsPath, jsResources)
	setJsonPropByPath(response, htmlPluginsPath, 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/", "/p/", "/x/", "/dashboard/", "/admin/"}
	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 == "/" {
	r.URL.Path = "/index.html"
	log.Println("Redirecting to /index.html")
	break
	} else if match := issueNumRE.Find([]byte(r.URL.Path)); match != nil {
	r.URL.Path = "/index.html"
	log.Println("Redirecting to /index.html")
	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)
	}