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Rework recordings server.
Simplifies the code, makes the files cachable, fixes permission issues.
This commit is contained in:
Juliusz Chroboczek
parent
eab848f2cf
commit
4e14c29fbb
1 changed files with 84 additions and 78 deletions
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@ -107,24 +107,32 @@ func httpError(w http.ResponseWriter, err error) {
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return
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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 makeEtag(d os.FileInfo) string {
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return fmt.Sprintf("\"%v-%v\"", d.Size(), d.ModTime().UnixNano())
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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 isVeryCachable(p string) bool {
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return strings.HasPrefix(p, "/fonts/") ||
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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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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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@ -143,13 +151,13 @@ func (fh *fileHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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return
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}
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defer f.Close()
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d, err := f.Stat()
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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 d.IsDir() {
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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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@ -175,22 +183,12 @@ func (fh *fileHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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httpError(w, ErrIsDirectory)
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return
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}
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f, d = ff, dd
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f, fi = ff, dd
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p = index
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}
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etag := makeEtag(d)
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if etag != "" {
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w.Header().Add("ETag", etag)
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}
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cc := normalCacheControl
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if isVeryCachable(p) {
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cc = veryCachableCacheControl
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}
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w.Header().Add("Cache-Control", cc)
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http.ServeContent(w, r, d.Name(), d.ModTime(), f)
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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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@ -202,25 +200,19 @@ func serveFile(w http.ResponseWriter, r *http.Request, p string) {
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return
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}
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defer f.Close()
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d, err := f.Stat()
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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 d.IsDir() {
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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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etag := makeEtag(d)
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if etag != "" {
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w.Header().Add("ETag", etag)
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}
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w.Header().Add("Cache-Control", normalCacheControl)
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http.ServeContent(w, r, d.Name(), d.ModTime(), f)
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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(path string) string {
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@ -423,55 +415,64 @@ func recordingsHandler(w http.ResponseWriter, r *http.Request) {
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return
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}
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pth := r.URL.Path[12:]
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p := "/" + r.URL.Path[12:]
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if pth == "" {
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http.Error(w, "nothing to see", http.StatusNotImplemented)
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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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f, err := os.Open(filepath.Join(disk.Directory, pth))
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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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p = path.Clean(p)
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f, err := os.Open(filepath.Join(disk.Directory, p))
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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, "server error",
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http.StatusInternalServerError)
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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 f.Close()
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fi, err := f.Stat()
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if err != nil {
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http.Error(w, "server error", http.StatusInternalServerError)
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httpError(w, err)
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return
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}
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group := path.Dir(p[1:])
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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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group = p[1:]
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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 fi.IsDir() {
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if pth[len(pth)-1] != '/' {
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http.Redirect(w, r,
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r.URL.Path+"/", http.StatusPermanentRedirect)
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return
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}
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ok := checkGroupPermissions(w, r, path.Dir(pth))
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if !ok {
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failAuthentication(w, "recordings/"+path.Dir(pth))
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return
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}
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if r.Method == "POST" {
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handleGroupAction(w, r, path.Dir(pth))
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handleGroupAction(w, r, group)
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} else {
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serveGroupRecordings(w, r, f, path.Dir(pth))
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serveGroupRecordings(w, r, f, group)
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}
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} else {
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ok := checkGroupPermissions(w, r, path.Dir(pth))
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if !ok {
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failAuthentication(w, "recordings/"+path.Dir(pth))
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return
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}
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http.ServeContent(w, r, r.URL.Path, fi.ModTime(), f)
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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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@ -496,17 +497,21 @@ func handleGroupAction(w http.ResponseWriter, r *http.Request, group string) {
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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(disk.Directory, group+"/"+filename),
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filepath.Join(disk.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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if os.IsPermission(err) {
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http.Error(w, "unauthorized",
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http.StatusForbidden)
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} else {
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http.Error(w, "server error",
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http.StatusInternalServerError)
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}
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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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@ -553,7 +558,7 @@ func serveGroupRecordings(w http.ResponseWriter, r *http.Request, f *os.File, gr
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fmt.Fprintf(w, "<!DOCTYPE html>\n<html><head>\n")
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fmt.Fprintf(w, "<title>Recordings for group %v</title>\n", group)
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fmt.Fprintf(w, "<link rel=\"stylesheet\" type=\"text/css\" href=\"/common.css\"/>")
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fmt.Fprintf(w, "<head><body>\n")
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fmt.Fprintf(w, "</head><body>\n")
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fmt.Fprintf(w, "<table>\n")
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for _, fi := range fis {
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@ -566,8 +571,9 @@ func serveGroupRecordings(w http.ResponseWriter, r *http.Request, f *os.File, gr
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fi.Size(),
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)
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fmt.Fprintf(w,
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"<td><form action=\"/recordings/%v/?q=delete\" method=\"post\">"+
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"<button type=\"submit\" name=\"filename\" value=\"%v\">Delete</button>"+
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"<td><form action=\"/recordings/%v/\" method=\"post\">"+
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"<input type=\"hidden\" name=\"filename\" value=\"%v\">"+
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"<button type=\"submit\" name=\"q\" value=\"delete\">Delete</button>"+
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"</form></td></tr>\n",
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url.PathEscape(group), fi.Name())
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}
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