2020-04-24 19:38:21 +02:00
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// Copyright (c) 2020 by Juliusz Chroboczek.
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// This is not open source software. Copy it, and I'll break into your
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// house and tell your three year-old that Santa doesn't exist.
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package main
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import (
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2020-04-29 16:08:07 +02:00
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"bufio"
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"encoding/json"
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"errors"
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2020-04-24 19:38:21 +02:00
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"flag"
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2020-04-29 16:08:07 +02:00
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"fmt"
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"html"
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"io"
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2020-04-24 19:38:21 +02:00
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"log"
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"net/http"
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"os"
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"os/signal"
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"path/filepath"
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"strings"
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"syscall"
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"time"
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"github.com/gorilla/websocket"
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)
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var httpAddr string
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var staticRoot string
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var dataDir string
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2020-04-25 02:25:51 +02:00
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var groupsDir string
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var iceFilename string
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func main() {
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flag.StringVar(&httpAddr, "http", ":8443", "web server `address`")
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flag.StringVar(&staticRoot, "static", "./static/",
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"web server root `directory`")
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flag.StringVar(&dataDir, "data", "./data/",
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"data `directory`")
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flag.StringVar(&groupsDir, "groups", "./groups/",
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"group description `directory`")
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flag.Parse()
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iceFilename = filepath.Join(staticRoot, "ice-servers.json")
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http.Handle("/", mungeHandler{http.FileServer(http.Dir(staticRoot))})
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http.HandleFunc("/group/",
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func(w http.ResponseWriter, r *http.Request) {
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mungeHeader(w)
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http.ServeFile(w, r, staticRoot+"/sfu.html")
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})
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http.HandleFunc("/ws", wsHandler)
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http.HandleFunc("/public-groups.json", publicHandler)
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http.HandleFunc("/stats", statsHandler)
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2020-04-25 04:08:43 +02:00
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go readPublicGroups()
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go func() {
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server := &http.Server{
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Addr: httpAddr,
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ReadTimeout: 60 * time.Second,
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WriteTimeout: 30 * time.Second,
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IdleTimeout: 120 * time.Second,
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}
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var err error
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log.Printf("Listening on %v", httpAddr)
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err = server.ListenAndServeTLS(
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filepath.Join(dataDir, "cert.pem"),
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filepath.Join(dataDir, "key.pem"),
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)
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log.Fatalf("ListenAndServeTLS: %v", err)
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}()
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terminate := make(chan os.Signal, 1)
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signal.Notify(terminate, syscall.SIGINT)
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<-terminate
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}
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func mungeHeader(w http.ResponseWriter) {
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w.Header().Add("Content-Security-Policy",
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"connect-src ws: wss: 'self'; img-src data: 'self'; default-src 'self'")
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}
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type mungeHandler struct {
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h http.Handler
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}
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func (h mungeHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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mungeHeader(w)
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h.h.ServeHTTP(w, r)
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}
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func publicHandler(w http.ResponseWriter, r *http.Request) {
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w.Header().Set("content-type", "application/json")
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w.Header().Set("cache-control", "no-cache")
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if r.Method == "HEAD" {
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return
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}
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g := getPublicGroups()
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e := json.NewEncoder(w)
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e.Encode(g)
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return
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}
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2020-04-29 16:08:07 +02:00
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func getPassword() (string, string, error) {
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f, err := os.Open(filepath.Join(dataDir, "passwd"))
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if err != nil {
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return "", "", err
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}
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defer f.Close()
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r := bufio.NewReader(f)
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s, err := r.ReadString('\n')
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if err != nil {
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return "", "", err
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}
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l := strings.SplitN(strings.TrimSpace(s), ":", 2)
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if len(l) != 2 {
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return "", "", errors.New("couldn't parse passwords")
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}
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return l[0], l[1], nil
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}
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func statsHandler(w http.ResponseWriter, r *http.Request) {
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bail := func() {
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w.Header().Set("www-authenticate", "basic realm=\"stats\"")
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http.Error(w, "Haha!", http.StatusUnauthorized)
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}
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u, p, err := getPassword()
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if err != nil {
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log.Printf("Passwd: %v", err)
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bail()
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return
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}
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username, password, ok := r.BasicAuth()
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if !ok || username != u || password != p {
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bail()
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return
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}
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w.Header().Set("content-type", "text/html; charset=utf-8")
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w.Header().Set("cache-control", "no-cache")
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if r.Method == "HEAD" {
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return
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}
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stats := getGroupStats()
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fmt.Fprintf(w, "<!DOCTYPE html>\n<html><head>\n")
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fmt.Fprintf(w, "<title>Stats</title>\n")
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fmt.Fprintf(w, "<head><body>\n")
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2020-04-30 20:33:04 +02:00
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printBitrate := func(w io.Writer, rate, maxRate uint64) error {
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var err error
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if maxRate != 0 && maxRate != ^uint64(0) {
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_, err = fmt.Fprintf(w, "%v/%v", rate, maxRate)
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} else {
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_, err = fmt.Fprintf(w, "%v", rate)
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}
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return err
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}
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printTrack := func(w io.Writer, t trackStats) {
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fmt.Fprintf(w, "<tr><td></td><td></td><td></td>")
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fmt.Fprintf(w, "<td>")
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printBitrate(w, t.bitrate, t.maxBitrate)
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fmt.Fprintf(w, "</td>")
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fmt.Fprintf(w, "<td>%d%%</td>",
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t.loss,
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)
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if t.jitter > 0 {
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fmt.Fprintf(w, "<td>%v</td>", t.jitter)
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} else {
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fmt.Fprintf(w, "<td></td>")
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}
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fmt.Fprintf(w, "</tr>")
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}
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for _, gs := range stats {
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fmt.Fprintf(w, "<p>%v</p>\n", html.EscapeString(gs.name))
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fmt.Fprintf(w, "<table>")
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for _, cs := range gs.clients {
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fmt.Fprintf(w, "<tr><td>%v</td></tr>\n", cs.id)
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for _, up := range cs.up {
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fmt.Fprintf(w, "<tr><td></td><td>Up</td><td>%v</td></tr>\n",
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up.id)
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for _, t := range up.tracks {
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printTrack(w, t)
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}
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}
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for _, up := range cs.down {
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fmt.Fprintf(w, "<tr><td></td><td>Down</td><td> %v</td></tr>\n",
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up.id)
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for _, t := range up.tracks {
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printTrack(w, t)
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}
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}
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}
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fmt.Fprintf(w, "</table>\n")
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}
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fmt.Fprintf(w, "</body></html>\n")
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}
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2020-04-24 19:38:21 +02:00
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var upgrader websocket.Upgrader
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func wsHandler(w http.ResponseWriter, r *http.Request) {
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conn, err := upgrader.Upgrade(w, r, nil)
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if err != nil {
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log.Printf("Websocket upgrade: %v", err)
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return
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}
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go func() {
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err := startClient(conn)
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if err != nil {
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log.Printf("client: %v", err)
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}
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}()
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}
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