package weed_server import ( "bytes" "io" "mime" "mime/multipart" "net/http" "net/url" "path" "strconv" "strings" "time" "encoding/json" "github.com/chrislusf/seaweedfs/weed/glog" "github.com/chrislusf/seaweedfs/weed/images" "github.com/chrislusf/seaweedfs/weed/operation" "github.com/chrislusf/seaweedfs/weed/storage" "github.com/chrislusf/seaweedfs/weed/util" ) var fileNameEscaper = strings.NewReplacer("\\", "\\\\", "\"", "\\\"") func (vs *VolumeServer) GetOrHeadHandler(w http.ResponseWriter, r *http.Request) { n := new(storage.Needle) vid, fid, filename, ext, _ := parseURLPath(r.URL.Path) volumeId, err := storage.NewVolumeId(vid) if err != nil { glog.V(2).Infoln("parsing error:", err, r.URL.Path) w.WriteHeader(http.StatusBadRequest) return } err = n.ParsePath(fid) if err != nil { glog.V(2).Infoln("parsing fid error:", err, r.URL.Path) w.WriteHeader(http.StatusBadRequest) return } glog.V(4).Infoln("volume", volumeId, "reading", n) if !vs.store.HasVolume(volumeId) { if !vs.ReadRedirect { glog.V(2).Infoln("volume is not local:", err, r.URL.Path) w.WriteHeader(http.StatusNotFound) return } lookupResult, err := operation.Lookup(vs.GetMasterNode(), volumeId.String()) glog.V(2).Infoln("volume", volumeId, "found on", lookupResult, "error", err) if err == nil && len(lookupResult.Locations) > 0 { u, _ := url.Parse(util.NormalizeUrl(lookupResult.Locations[0].PublicUrl)) u.Path = r.URL.Path arg := url.Values{} if c := r.FormValue("collection"); c != "" { arg.Set("collection", c) } u.RawQuery = arg.Encode() http.Redirect(w, r, u.String(), http.StatusMovedPermanently) } else { glog.V(2).Infoln("lookup error:", err, r.URL.Path) w.WriteHeader(http.StatusNotFound) } return } cookie := n.Cookie count, e := vs.store.ReadVolumeNeedle(volumeId, n) glog.V(4).Infoln("read bytes", count, "error", e) if e != nil || count < 0 { glog.V(0).Infoln("read error:", e, r.URL.Path) w.WriteHeader(http.StatusNotFound) return } if n.Cookie != cookie { glog.V(0).Infoln("request", r.URL.Path, "with unmaching cookie seen:", cookie, "expected:", n.Cookie, "from", r.RemoteAddr, "agent", r.UserAgent()) w.WriteHeader(http.StatusNotFound) return } if n.LastModified != 0 { w.Header().Set("Last-Modified", time.Unix(int64(n.LastModified), 0).UTC().Format(http.TimeFormat)) if r.Header.Get("If-Modified-Since") != "" { if t, parseError := time.Parse(http.TimeFormat, r.Header.Get("If-Modified-Since")); parseError == nil { if t.Unix() >= int64(n.LastModified) { w.WriteHeader(http.StatusNotModified) return } } } } etag := n.Etag() if inm := r.Header.Get("If-None-Match"); inm == etag { w.WriteHeader(http.StatusNotModified) return } w.Header().Set("Etag", etag) if n.HasPairs() { pairMap := make(map[string]string) err = json.Unmarshal(n.Pairs, &pairMap) if err != nil { glog.V(0).Infoln("Unmarshal pairs error:", err) } for k, v := range pairMap { w.Header().Set(k, v) } } if vs.tryHandleChunkedFile(n, filename, w, r) { return } if n.NameSize > 0 && filename == "" { filename = string(n.Name) if ext == "" { ext = path.Ext(filename) } } mtype := "" if n.MimeSize > 0 { mt := string(n.Mime) if !strings.HasPrefix(mt, "application/octet-stream") { mtype = mt } } if ext != ".gz" { if n.IsGzipped() { if strings.Contains(r.Header.Get("Accept-Encoding"), "gzip") { w.Header().Set("Content-Encoding", "gzip") } else { if n.Data, err = operation.UnGzipData(n.Data); err != nil { glog.V(0).Infoln("ungzip error:", err, r.URL.Path) } } } } if ext == ".png" || ext == ".jpg" || ext == ".gif" { width, height := 0, 0 if r.FormValue("width") != "" { width, _ = strconv.Atoi(r.FormValue("width")) } if r.FormValue("height") != "" { height, _ = strconv.Atoi(r.FormValue("height")) } n.Data, _, _ = images.Resized(ext, n.Data, width, height, r.FormValue("mode")) } if e := writeResponseContent(filename, mtype, bytes.NewReader(n.Data), w, r); e != nil { glog.V(2).Infoln("response write error:", e) } } func (vs *VolumeServer) tryHandleChunkedFile(n *storage.Needle, fileName string, w http.ResponseWriter, r *http.Request) (processed bool) { if !n.IsChunkedManifest() || r.URL.Query().Get("cm") == "false" { return false } chunkManifest, e := operation.LoadChunkManifest(n.Data, n.IsGzipped()) if e != nil { glog.V(0).Infof("load chunked manifest (%s) error: %v", r.URL.Path, e) return false } if fileName == "" && chunkManifest.Name != "" { fileName = chunkManifest.Name } mType := "" if chunkManifest.Mime != "" { mt := chunkManifest.Mime if !strings.HasPrefix(mt, "application/octet-stream") { mType = mt } } w.Header().Set("X-File-Store", "chunked") chunkedFileReader := &operation.ChunkedFileReader{ Manifest: chunkManifest, Master: vs.GetMasterNode(), } defer chunkedFileReader.Close() if e := writeResponseContent(fileName, mType, chunkedFileReader, w, r); e != nil { glog.V(2).Infoln("response write error:", e) } return true } func writeResponseContent(filename, mimeType string, rs io.ReadSeeker, w http.ResponseWriter, r *http.Request) error { totalSize, e := rs.Seek(0, 2) if mimeType == "" { if ext := path.Ext(filename); ext != "" { mimeType = mime.TypeByExtension(ext) } } if mimeType != "" { w.Header().Set("Content-Type", mimeType) } if filename != "" { contentDisposition := "inline" if r.FormValue("dl") != "" { if dl, _ := strconv.ParseBool(r.FormValue("dl")); dl { contentDisposition = "attachment" } } w.Header().Set("Content-Disposition", contentDisposition+`; filename="`+fileNameEscaper.Replace(filename)+`"`) } w.Header().Set("Accept-Ranges", "bytes") if r.Method == "HEAD" { w.Header().Set("Content-Length", strconv.FormatInt(totalSize, 10)) return nil } rangeReq := r.Header.Get("Range") if rangeReq == "" { w.Header().Set("Content-Length", strconv.FormatInt(totalSize, 10)) if _, e = rs.Seek(0, 0); e != nil { return e } _, e = io.Copy(w, rs) return e } //the rest is dealing with partial content request //mostly copy from src/pkg/net/http/fs.go ranges, err := parseRange(rangeReq, totalSize) if err != nil { http.Error(w, err.Error(), http.StatusRequestedRangeNotSatisfiable) return nil } if sumRangesSize(ranges) > totalSize { // The total number of bytes in all the ranges // is larger than the size of the file by // itself, so this is probably an attack, or a // dumb client. Ignore the range request. return nil } if len(ranges) == 0 { return nil } if len(ranges) == 1 { // RFC 2616, Section 14.16: // "When an HTTP message includes the content of a single // range (for example, a response to a request for a // single range, or to a request for a set of ranges // that overlap without any holes), this content is // transmitted with a Content-Range header, and a // Content-Length header showing the number of bytes // actually transferred. // ... // A response to a request for a single range MUST NOT // be sent using the multipart/byteranges media type." ra := ranges[0] w.Header().Set("Content-Length", strconv.FormatInt(ra.length, 10)) w.Header().Set("Content-Range", ra.contentRange(totalSize)) w.WriteHeader(http.StatusPartialContent) if _, e = rs.Seek(ra.start, 0); e != nil { return e } _, e = io.CopyN(w, rs, ra.length) return e } // process multiple ranges for _, ra := range ranges { if ra.start > totalSize { http.Error(w, "Out of Range", http.StatusRequestedRangeNotSatisfiable) return nil } } sendSize := rangesMIMESize(ranges, mimeType, totalSize) pr, pw := io.Pipe() mw := multipart.NewWriter(pw) w.Header().Set("Content-Type", "multipart/byteranges; boundary="+mw.Boundary()) sendContent := pr defer pr.Close() // cause writing goroutine to fail and exit if CopyN doesn't finish. go func() { for _, ra := range ranges { part, e := mw.CreatePart(ra.mimeHeader(mimeType, totalSize)) if e != nil { pw.CloseWithError(e) return } if _, e = rs.Seek(ra.start, 0); e != nil { pw.CloseWithError(e) return } if _, e = io.CopyN(part, rs, ra.length); e != nil { pw.CloseWithError(e) return } } mw.Close() pw.Close() }() if w.Header().Get("Content-Encoding") == "" { w.Header().Set("Content-Length", strconv.FormatInt(sendSize, 10)) } w.WriteHeader(http.StatusPartialContent) _, e = io.CopyN(w, sendContent, sendSize) return e }