mirror of
https://github.com/jech/galene.git
synced 2024-11-26 10:35:59 +01:00
24187430e8
We now distinguish between status, which is maintained by the server, and data, which is provided by the client. In addition to client data, we now support group data.
656 lines
13 KiB
Go
656 lines
13 KiB
Go
package webserver
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import (
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"context"
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"crypto/tls"
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"encoding/json"
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"errors"
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"fmt"
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"html"
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"io"
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"log"
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"net/http"
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"net/url"
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"os"
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"path"
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"path/filepath"
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"sort"
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"strings"
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"sync/atomic"
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"time"
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"github.com/gorilla/websocket"
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"github.com/jech/cert"
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"github.com/jech/galene/diskwriter"
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"github.com/jech/galene/group"
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"github.com/jech/galene/rtpconn"
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"github.com/jech/galene/stats"
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)
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var server atomic.Value
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var StaticRoot string
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var Insecure bool
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func Serve(address string, dataDir string) error {
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http.Handle("/", &fileHandler{http.Dir(StaticRoot)})
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http.HandleFunc("/group/", groupHandler)
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http.HandleFunc("/recordings",
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func(w http.ResponseWriter, r *http.Request) {
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http.Redirect(w, r,
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"/recordings/", http.StatusPermanentRedirect)
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})
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http.HandleFunc("/recordings/", recordingsHandler)
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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.json",
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func(w http.ResponseWriter, r *http.Request) {
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statsHandler(w, r, dataDir)
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})
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s := &http.Server{
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Addr: address,
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ReadHeaderTimeout: 60 * time.Second,
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IdleTimeout: 120 * time.Second,
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}
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if !Insecure {
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certificate := cert.New(
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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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s.TLSConfig = &tls.Config{
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GetCertificate: func(hello *tls.ClientHelloInfo) (*tls.Certificate, error) {
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return certificate.Get()
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},
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}
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}
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s.RegisterOnShutdown(func() {
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group.Shutdown("server is shutting down")
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})
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server.Store(s)
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var err error
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if !Insecure {
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err = s.ListenAndServeTLS("", "")
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} else {
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err = s.ListenAndServe()
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}
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if err == http.ErrServerClosed {
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return nil
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}
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return err
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}
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func cspHeader(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'; media-src blob: 'self'; default-src 'self'")
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}
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func notFound(w http.ResponseWriter) {
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w.Header().Set("Content-Type", "text/html; charset=utf-8")
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w.WriteHeader(http.StatusNotFound)
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f, err := os.Open(path.Join(StaticRoot, "404.html"))
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if err != nil {
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fmt.Fprintln(w, "<p>Not found</p>")
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return
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}
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defer f.Close()
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io.Copy(w, f)
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}
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var ErrIsDirectory = errors.New("is a directory")
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func httpError(w http.ResponseWriter, err error) {
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if os.IsNotExist(err) {
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notFound(w)
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return
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}
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if os.IsPermission(err) {
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http.Error(w, "403 forbidden", http.StatusForbidden)
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return
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}
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log.Printf("HTTP server error: %v", err)
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http.Error(w, "500 Internal Server Error",
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http.StatusInternalServerError)
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return
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}
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const (
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normalCacheControl = "max-age=1800"
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veryCachableCacheControl = "max-age=86400"
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)
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func redirect(w http.ResponseWriter, r *http.Request) bool {
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conf, err := group.GetConfiguration()
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if err != nil || conf.CanonicalHost == "" {
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return false
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}
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if strings.EqualFold(r.Host, conf.CanonicalHost) {
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return false
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}
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u := url.URL{
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Scheme: "https",
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Host: conf.CanonicalHost,
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Path: r.URL.Path,
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}
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http.Redirect(w, r, u.String(), http.StatusMovedPermanently)
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return true
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}
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func makeCachable(w http.ResponseWriter, p string, fi os.FileInfo, cachable bool) {
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etag := fmt.Sprintf("\"%v-%v\"", fi.Size(), fi.ModTime().UnixNano())
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w.Header().Set("ETag", etag)
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if !cachable {
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w.Header().Set("cache-control", "no-cache")
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return
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}
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cc := normalCacheControl
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if strings.HasPrefix(p, "/fonts/") ||
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strings.HasPrefix(p, "/scripts/") ||
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strings.HasPrefix(p, "/css/") {
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cc = veryCachableCacheControl
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}
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w.Header().Set("Cache-Control", cc)
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}
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// fileHandler is our custom reimplementation of http.FileServer
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type fileHandler struct {
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root http.FileSystem
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}
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func (fh *fileHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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if redirect(w, r) {
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return
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}
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cspHeader(w)
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p := r.URL.Path
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// this ensures any leading .. are removed by path.Clean below
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if !strings.HasPrefix(p, "/") {
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p = "/" + p
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r.URL.Path = p
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}
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p = path.Clean(p)
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f, err := fh.root.Open(p)
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if err != nil {
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httpError(w, err)
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return
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}
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defer f.Close()
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fi, err := f.Stat()
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if err != nil {
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httpError(w, err)
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return
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}
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if fi.IsDir() {
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u := r.URL.Path
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if u[len(u)-1] != '/' {
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http.Redirect(w, r, u+"/", http.StatusPermanentRedirect)
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return
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}
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index := path.Join(p, "index.html")
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ff, err := fh.root.Open(index)
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if err != nil {
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// return 403 if index.html doesn't exist
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if os.IsNotExist(err) {
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err = os.ErrPermission
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}
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httpError(w, err)
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return
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}
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defer ff.Close()
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dd, err := ff.Stat()
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if err != nil {
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httpError(w, err)
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return
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}
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if dd.IsDir() {
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httpError(w, ErrIsDirectory)
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return
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}
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f, fi = ff, dd
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p = index
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}
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makeCachable(w, p, fi, true)
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http.ServeContent(w, r, fi.Name(), fi.ModTime(), f)
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}
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// serveFile is similar to http.ServeFile, except that it doesn't check
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// for .. and adds cachability headers.
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func serveFile(w http.ResponseWriter, r *http.Request, p string) {
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f, err := os.Open(p)
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if err != nil {
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httpError(w, err)
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return
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}
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defer f.Close()
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fi, err := f.Stat()
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if err != nil {
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httpError(w, err)
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return
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}
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if fi.IsDir() {
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httpError(w, ErrIsDirectory)
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return
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}
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makeCachable(w, p, fi, true)
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http.ServeContent(w, r, fi.Name(), fi.ModTime(), f)
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}
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func parseGroupName(prefix string, p string) string {
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if !strings.HasPrefix(p, prefix) {
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return ""
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}
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name := p[len(prefix):]
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if name == "" {
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return ""
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}
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if name[0] == '.' {
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return ""
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}
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if filepath.Separator != '/' &&
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strings.ContainsRune(name, filepath.Separator) {
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return ""
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}
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name = path.Clean("/" + name)
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return name[1:]
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}
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func groupHandler(w http.ResponseWriter, r *http.Request) {
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if redirect(w, r) {
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return
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}
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if strings.HasSuffix(r.URL.Path, "/.status.json") {
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groupStatusHandler(w, r)
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return
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}
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name := parseGroupName("/group/", r.URL.Path)
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if name == "" {
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notFound(w)
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return
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}
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g, err := group.Add(name, nil)
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if err != nil {
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if os.IsNotExist(err) {
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notFound(w)
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} else {
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log.Printf("group.Add: %v", err)
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http.Error(w, "Internal server error",
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http.StatusInternalServerError)
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}
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return
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}
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if r.URL.Path != "/group/"+name+"/" {
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http.Redirect(w, r, "/group/"+name+"/",
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http.StatusPermanentRedirect)
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return
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}
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if redirect := g.Description().Redirect; redirect != "" {
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http.Redirect(w, r, redirect, http.StatusPermanentRedirect)
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return
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}
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cspHeader(w)
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serveFile(w, r, filepath.Join(StaticRoot, "galene.html"))
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}
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func groupStatusHandler(w http.ResponseWriter, r *http.Request) {
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path := path.Dir(r.URL.Path)
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name := parseGroupName("/group/", path)
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if name == "" {
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notFound(w)
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return
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}
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g, err := group.Add(name, nil)
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if err != nil {
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if os.IsNotExist(err) {
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notFound(w)
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} else {
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http.Error(w, "Internal server error",
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http.StatusInternalServerError)
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}
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return
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}
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d := g.Status(false)
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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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e := json.NewEncoder(w)
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e.Encode(d)
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return
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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 := group.GetPublic()
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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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func adminMatch(username, password string) (bool, error) {
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conf, err := group.GetConfiguration()
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if err != nil {
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return false, err
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}
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for _, cred := range conf.Admin {
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if cred.Username == "" || cred.Username == username {
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if ok, _ := cred.Password.Match(password); ok {
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return true, nil
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}
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}
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}
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return false, nil
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}
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func failAuthentication(w http.ResponseWriter, realm string) {
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w.Header().Set("www-authenticate",
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fmt.Sprintf("basic realm=\"%v\"", realm))
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http.Error(w, "Haha!", http.StatusUnauthorized)
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}
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func statsHandler(w http.ResponseWriter, r *http.Request, dataDir string) {
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username, password, ok := r.BasicAuth()
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if !ok {
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failAuthentication(w, "stats")
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return
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}
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if ok, err := adminMatch(username, password); !ok {
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if err != nil {
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log.Printf("Administrator password: %v", err)
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}
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failAuthentication(w, "stats")
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return
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}
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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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ss := stats.GetGroups()
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e := json.NewEncoder(w)
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err := e.Encode(ss)
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if err != nil {
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log.Printf("stats.json: %v", err)
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}
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return
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}
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var wsUpgrader = websocket.Upgrader{
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HandshakeTimeout: 30 * time.Second,
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}
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func wsHandler(w http.ResponseWriter, r *http.Request) {
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conn, err := wsUpgrader.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 := rtpconn.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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func recordingsHandler(w http.ResponseWriter, r *http.Request) {
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if redirect(w, r) {
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return
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}
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if len(r.URL.Path) < 12 || r.URL.Path[:12] != "/recordings/" {
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http.Error(w, "server error", http.StatusInternalServerError)
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return
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}
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p := "/" + r.URL.Path[12:]
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if filepath.Separator != '/' &&
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strings.ContainsRune(p, filepath.Separator) {
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http.Error(w, "bad character in filename",
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http.StatusBadRequest)
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return
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}
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p = path.Clean(p)
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if p == "/" {
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http.Error(w, "nothing to see", http.StatusForbidden)
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return
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}
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f, err := os.Open(filepath.Join(diskwriter.Directory, p))
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if err != nil {
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httpError(w, err)
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return
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}
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defer f.Close()
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fi, err := f.Stat()
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if err != nil {
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httpError(w, err)
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return
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}
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var group, filename string
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if fi.IsDir() {
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for len(p) > 0 && p[len(p)-1] == '/' {
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p = p[:len(p)-1]
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}
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group = parseGroupName("/", p)
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if group == "" {
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http.Error(w, "bad group name", http.StatusBadRequest)
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return
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}
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} else {
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if p[len(p)-1] == '/' {
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http.Error(w, "bad group name", http.StatusBadRequest)
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return
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}
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group, filename = path.Split(p)
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group = parseGroupName("/", group)
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if group == "" {
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http.Error(w, "bad group name", http.StatusBadRequest)
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return
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}
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}
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u := "/recordings/" + group + "/" + filename
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if r.URL.Path != u {
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http.Redirect(w, r, u, http.StatusPermanentRedirect)
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return
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}
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ok := checkGroupPermissions(w, r, group)
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if !ok {
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failAuthentication(w, "recordings/"+group)
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return
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}
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if filename == "" {
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if r.Method == "POST" {
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handleGroupAction(w, r, group)
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} else {
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serveGroupRecordings(w, r, f, group)
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}
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return
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}
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// Ensure the file is uncachable if it's still recording
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cachable := time.Since(fi.ModTime()) > time.Minute
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makeCachable(w, path.Join("/recordings/", p), fi, cachable)
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http.ServeContent(w, r, fi.Name(), fi.ModTime(), f)
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}
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func handleGroupAction(w http.ResponseWriter, r *http.Request, group string) {
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if r.Method != "POST" {
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http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
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return
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}
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err := r.ParseForm()
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if err != nil {
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http.Error(w, "couldn't parse request", http.StatusBadRequest)
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return
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}
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q := r.Form.Get("q")
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switch q {
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case "delete":
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filename := r.Form.Get("filename")
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if group == "" || filename == "" {
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http.Error(w, "no filename provided",
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http.StatusBadRequest)
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return
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}
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if strings.ContainsRune(filename, '/') ||
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strings.ContainsRune(filename, filepath.Separator) {
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http.Error(w, "bad character in filename",
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http.StatusBadRequest)
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return
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}
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err := os.Remove(
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filepath.Join(diskwriter.Directory,
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filepath.Join(group,
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path.Clean("/"+filename),
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),
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),
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)
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if err != nil {
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httpError(w, err)
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return
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}
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http.Redirect(w, r, "/recordings/"+group+"/",
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http.StatusSeeOther)
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return
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default:
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http.Error(w, "unknown query", http.StatusBadRequest)
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}
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}
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func checkGroupPermissions(w http.ResponseWriter, r *http.Request, groupname string) bool {
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desc, err := group.GetDescription(groupname)
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if err != nil {
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return false
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}
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user, pass, ok := r.BasicAuth()
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if !ok {
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return false
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}
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p, err := desc.GetPermission(groupname,
|
|
group.ClientCredentials{
|
|
Username: user,
|
|
Password: pass,
|
|
},
|
|
)
|
|
if err != nil || !p.Record {
|
|
if err == group.ErrNotAuthorised {
|
|
time.Sleep(200 * time.Millisecond)
|
|
}
|
|
return false
|
|
}
|
|
|
|
return true
|
|
}
|
|
|
|
func serveGroupRecordings(w http.ResponseWriter, r *http.Request, f *os.File, group string) {
|
|
// read early, so we return permission errors to HEAD
|
|
fis, err := f.Readdir(-1)
|
|
if err != nil {
|
|
http.Error(w, "server error", http.StatusInternalServerError)
|
|
return
|
|
}
|
|
|
|
sort.Slice(fis, func(i, j int) bool {
|
|
return fis[i].Name() < fis[j].Name()
|
|
})
|
|
|
|
w.Header().Set("content-type", "text/html; charset=utf-8")
|
|
w.Header().Set("cache-control", "no-cache")
|
|
|
|
if r.Method == "HEAD" {
|
|
return
|
|
}
|
|
|
|
fmt.Fprintf(w, "<!DOCTYPE html>\n<html><head>\n")
|
|
fmt.Fprintf(w, "<title>Recordings for group %v</title>\n", group)
|
|
fmt.Fprintf(w, "<link rel=\"stylesheet\" type=\"text/css\" href=\"/common.css\"/>")
|
|
fmt.Fprintf(w, "</head><body>\n")
|
|
|
|
fmt.Fprintf(w, "<table>\n")
|
|
for _, fi := range fis {
|
|
if fi.IsDir() {
|
|
continue
|
|
}
|
|
fmt.Fprintf(w, "<tr><td><a href=\"./%v\">%v</a></td><td>%d</td>",
|
|
html.EscapeString(fi.Name()),
|
|
html.EscapeString(fi.Name()),
|
|
fi.Size(),
|
|
)
|
|
fmt.Fprintf(w,
|
|
"<td><form action=\"/recordings/%v/\" method=\"post\">"+
|
|
"<input type=\"hidden\" name=\"filename\" value=\"%v\">"+
|
|
"<button type=\"submit\" name=\"q\" value=\"delete\">Delete</button>"+
|
|
"</form></td></tr>\n",
|
|
url.PathEscape(group), fi.Name())
|
|
}
|
|
fmt.Fprintf(w, "</table>\n")
|
|
fmt.Fprintf(w, "</body></html>\n")
|
|
}
|
|
|
|
func Shutdown() {
|
|
v := server.Load()
|
|
if v == nil {
|
|
return
|
|
}
|
|
s := v.(*http.Server)
|
|
ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
|
|
defer cancel()
|
|
s.Shutdown(ctx)
|
|
}
|