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package weed_server
import ( "io" "mime" "mime/multipart" "net/http" "strconv" "strings" "time"
"github.com/chrislusf/seaweedfs/go/glog" "github.com/chrislusf/seaweedfs/go/images" "github.com/chrislusf/seaweedfs/go/operation" "github.com/chrislusf/seaweedfs/go/storage" "github.com/chrislusf/seaweedfs/go/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 { http.Redirect(w, r, util.NormalizeUrl(lookupResult.Locations[0].PublicUrl)+r.URL.Path, 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.NameSize > 0 && filename == "" { filename = string(n.Name) dotIndex := strings.LastIndex(filename, ".") if dotIndex > 0 { ext = filename[dotIndex:] } } mtype := "" if ext != "" { mtype = mime.TypeByExtension(ext) } if n.MimeSize > 0 { mt := string(n.Mime) if !strings.HasPrefix(mt, "application/octet-stream") { mtype = mt } } if mtype != "" { w.Header().Set("Content-Type", mtype) } if filename != "" { w.Header().Set("Content-Disposition", "filename=\""+fileNameEscaper.Replace(filename)+"\"") } 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 = storage.UnGzipData(n.Data); err != nil { glog.V(0).Infoln("lookup 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) }
w.Header().Set("Accept-Ranges", "bytes") if r.Method == "HEAD" { w.Header().Set("Content-Length", strconv.Itoa(len(n.Data))) return } rangeReq := r.Header.Get("Range") if rangeReq == "" { w.Header().Set("Content-Length", strconv.Itoa(len(n.Data))) if _, e = w.Write(n.Data); e != nil { glog.V(0).Infoln("response write error:", e) } return }
//the rest is dealing with partial content request
//mostly copy from src/pkg/net/http/fs.go
size := int64(len(n.Data)) ranges, err := parseRange(rangeReq, size) if err != nil { http.Error(w, err.Error(), http.StatusRequestedRangeNotSatisfiable) return } if sumRangesSize(ranges) > size { // 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.
ranges = nil return } if len(ranges) == 0 { return } 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(size)) w.WriteHeader(http.StatusPartialContent) if _, e = w.Write(n.Data[ra.start : ra.start+ra.length]); e != nil { glog.V(0).Infoln("response write error:", e) } return } // process mulitple ranges
for _, ra := range ranges { if ra.start > size { http.Error(w, "Out of Range", http.StatusRequestedRangeNotSatisfiable) return } } sendSize := rangesMIMESize(ranges, mtype, size) 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, err := mw.CreatePart(ra.mimeHeader(mtype, size)) if err != nil { pw.CloseWithError(err) return } if _, err = part.Write(n.Data[ra.start : ra.start+ra.length]); err != nil { pw.CloseWithError(err) return } } mw.Close() pw.Close() }() if w.Header().Get("Content-Encoding") == "" { w.Header().Set("Content-Length", strconv.FormatInt(sendSize, 10)) } w.WriteHeader(http.StatusPartialContent) io.CopyN(w, sendContent, sendSize)
}
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