mirror of
https://github.com/seaweedfs/seaweedfs.git
synced 2024-11-24 19:19:11 +08:00
314 lines
8.7 KiB
Go
314 lines
8.7 KiB
Go
package weed_server
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import (
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"bytes"
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"io"
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"mime"
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"mime/multipart"
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"net/http"
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"net/url"
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"path"
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"strconv"
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"strings"
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"time"
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"encoding/json"
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"github.com/chrislusf/seaweedfs/weed/glog"
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"github.com/chrislusf/seaweedfs/weed/images"
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"github.com/chrislusf/seaweedfs/weed/operation"
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"github.com/chrislusf/seaweedfs/weed/storage"
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"github.com/chrislusf/seaweedfs/weed/util"
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)
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var fileNameEscaper = strings.NewReplacer("\\", "\\\\", "\"", "\\\"")
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func (vs *VolumeServer) GetOrHeadHandler(w http.ResponseWriter, r *http.Request) {
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n := new(storage.Needle)
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vid, fid, filename, ext, _ := parseURLPath(r.URL.Path)
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volumeId, err := storage.NewVolumeId(vid)
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if err != nil {
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glog.V(2).Infoln("parsing error:", err, r.URL.Path)
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w.WriteHeader(http.StatusBadRequest)
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return
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}
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err = n.ParsePath(fid)
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if err != nil {
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glog.V(2).Infoln("parsing fid error:", err, r.URL.Path)
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w.WriteHeader(http.StatusBadRequest)
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return
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}
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glog.V(4).Infoln("volume", volumeId, "reading", n)
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if !vs.store.HasVolume(volumeId) {
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if !vs.ReadRedirect {
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glog.V(2).Infoln("volume is not local:", err, r.URL.Path)
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w.WriteHeader(http.StatusNotFound)
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return
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}
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lookupResult, err := operation.Lookup(vs.GetMaster(), volumeId.String())
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glog.V(2).Infoln("volume", volumeId, "found on", lookupResult, "error", err)
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if err == nil && len(lookupResult.Locations) > 0 {
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u, _ := url.Parse(util.NormalizeUrl(lookupResult.Locations[0].PublicUrl))
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u.Path = r.URL.Path
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arg := url.Values{}
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if c := r.FormValue("collection"); c != "" {
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arg.Set("collection", c)
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}
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u.RawQuery = arg.Encode()
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http.Redirect(w, r, u.String(), http.StatusMovedPermanently)
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} else {
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glog.V(2).Infoln("lookup error:", err, r.URL.Path)
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w.WriteHeader(http.StatusNotFound)
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}
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return
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}
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cookie := n.Cookie
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count, e := vs.store.ReadVolumeNeedle(volumeId, n)
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glog.V(4).Infoln("read bytes", count, "error", e)
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if e != nil || count < 0 {
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glog.V(0).Infoln("read error:", e, r.URL.Path)
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w.WriteHeader(http.StatusNotFound)
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return
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}
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if n.Cookie != cookie {
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glog.V(0).Infoln("request", r.URL.Path, "with unmaching cookie seen:", cookie, "expected:", n.Cookie, "from", r.RemoteAddr, "agent", r.UserAgent())
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w.WriteHeader(http.StatusNotFound)
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return
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}
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if n.LastModified != 0 {
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w.Header().Set("Last-Modified", time.Unix(int64(n.LastModified), 0).UTC().Format(http.TimeFormat))
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if r.Header.Get("If-Modified-Since") != "" {
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if t, parseError := time.Parse(http.TimeFormat, r.Header.Get("If-Modified-Since")); parseError == nil {
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if t.Unix() >= int64(n.LastModified) {
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w.WriteHeader(http.StatusNotModified)
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return
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}
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}
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}
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}
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etag := n.Etag()
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if inm := r.Header.Get("If-None-Match"); inm == etag {
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w.WriteHeader(http.StatusNotModified)
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return
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}
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w.Header().Set("Etag", etag)
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if n.HasPairs() {
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pairMap := make(map[string]string)
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err = json.Unmarshal(n.Pairs, &pairMap)
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if err != nil {
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glog.V(0).Infoln("Unmarshal pairs error:", err)
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}
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for k, v := range pairMap {
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w.Header().Set(k, v)
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}
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}
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if vs.tryHandleChunkedFile(n, filename, w, r) {
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return
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}
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if n.NameSize > 0 && filename == "" {
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filename = string(n.Name)
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if ext == "" {
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ext = path.Ext(filename)
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}
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}
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mtype := ""
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if n.MimeSize > 0 {
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mt := string(n.Mime)
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if !strings.HasPrefix(mt, "application/octet-stream") {
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mtype = mt
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}
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}
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if ext != ".gz" {
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if n.IsGzipped() {
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if strings.Contains(r.Header.Get("Accept-Encoding"), "gzip") {
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w.Header().Set("Content-Encoding", "gzip")
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} else {
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if n.Data, err = operation.UnGzipData(n.Data); err != nil {
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glog.V(0).Infoln("ungzip error:", err, r.URL.Path)
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}
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}
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}
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}
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rs := conditionallyResizeImages(bytes.NewReader(n.Data), ext, r)
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if e := writeResponseContent(filename, mtype, rs, w, r); e != nil {
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glog.V(2).Infoln("response write error:", e)
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}
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}
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func (vs *VolumeServer) tryHandleChunkedFile(n *storage.Needle, fileName string, w http.ResponseWriter, r *http.Request) (processed bool) {
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if !n.IsChunkedManifest() || r.URL.Query().Get("cm") == "false" {
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return false
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}
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chunkManifest, e := operation.LoadChunkManifest(n.Data, n.IsGzipped())
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if e != nil {
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glog.V(0).Infof("load chunked manifest (%s) error: %v", r.URL.Path, e)
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return false
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}
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if fileName == "" && chunkManifest.Name != "" {
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fileName = chunkManifest.Name
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}
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ext := path.Ext(fileName)
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mType := ""
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if chunkManifest.Mime != "" {
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mt := chunkManifest.Mime
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if !strings.HasPrefix(mt, "application/octet-stream") {
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mType = mt
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}
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}
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w.Header().Set("X-File-Store", "chunked")
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chunkedFileReader := &operation.ChunkedFileReader{
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Manifest: chunkManifest,
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Master: vs.GetMaster(),
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}
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defer chunkedFileReader.Close()
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rs := conditionallyResizeImages(chunkedFileReader, ext, r)
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if e := writeResponseContent(fileName, mType, rs, w, r); e != nil {
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glog.V(2).Infoln("response write error:", e)
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}
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return true
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}
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func conditionallyResizeImages(originalDataReaderSeeker io.ReadSeeker, ext string, r *http.Request) io.ReadSeeker {
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rs := originalDataReaderSeeker
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if ext == ".png" || ext == ".jpg" || ext == ".jpeg" || ext == ".gif" {
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width, height := 0, 0
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if r.FormValue("width") != "" {
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width, _ = strconv.Atoi(r.FormValue("width"))
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}
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if r.FormValue("height") != "" {
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height, _ = strconv.Atoi(r.FormValue("height"))
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}
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rs, _, _ = images.Resized(ext, originalDataReaderSeeker, width, height, r.FormValue("mode"))
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}
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return rs
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}
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func writeResponseContent(filename, mimeType string, rs io.ReadSeeker, w http.ResponseWriter, r *http.Request) error {
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totalSize, e := rs.Seek(0, 2)
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if mimeType == "" {
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if ext := path.Ext(filename); ext != "" {
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mimeType = mime.TypeByExtension(ext)
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}
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}
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if mimeType != "" {
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w.Header().Set("Content-Type", mimeType)
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}
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if filename != "" {
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contentDisposition := "inline"
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if r.FormValue("dl") != "" {
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if dl, _ := strconv.ParseBool(r.FormValue("dl")); dl {
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contentDisposition = "attachment"
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}
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}
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w.Header().Set("Content-Disposition", contentDisposition+`; filename="`+fileNameEscaper.Replace(filename)+`"`)
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}
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w.Header().Set("Accept-Ranges", "bytes")
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if r.Method == "HEAD" {
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w.Header().Set("Content-Length", strconv.FormatInt(totalSize, 10))
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return nil
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}
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rangeReq := r.Header.Get("Range")
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if rangeReq == "" {
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w.Header().Set("Content-Length", strconv.FormatInt(totalSize, 10))
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if _, e = rs.Seek(0, 0); e != nil {
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return e
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}
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_, e = io.Copy(w, rs)
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return e
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}
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//the rest is dealing with partial content request
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//mostly copy from src/pkg/net/http/fs.go
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ranges, err := parseRange(rangeReq, totalSize)
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if err != nil {
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http.Error(w, err.Error(), http.StatusRequestedRangeNotSatisfiable)
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return nil
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}
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if sumRangesSize(ranges) > totalSize {
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// The total number of bytes in all the ranges
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// is larger than the size of the file by
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// itself, so this is probably an attack, or a
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// dumb client. Ignore the range request.
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return nil
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}
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if len(ranges) == 0 {
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return nil
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}
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if len(ranges) == 1 {
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// RFC 2616, Section 14.16:
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// "When an HTTP message includes the content of a single
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// range (for example, a response to a request for a
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// single range, or to a request for a set of ranges
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// that overlap without any holes), this content is
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// transmitted with a Content-Range header, and a
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// Content-Length header showing the number of bytes
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// actually transferred.
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// ...
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// A response to a request for a single range MUST NOT
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// be sent using the multipart/byteranges media type."
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ra := ranges[0]
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w.Header().Set("Content-Length", strconv.FormatInt(ra.length, 10))
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w.Header().Set("Content-Range", ra.contentRange(totalSize))
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w.WriteHeader(http.StatusPartialContent)
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if _, e = rs.Seek(ra.start, 0); e != nil {
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return e
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}
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_, e = io.CopyN(w, rs, ra.length)
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return e
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}
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// process multiple ranges
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for _, ra := range ranges {
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if ra.start > totalSize {
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http.Error(w, "Out of Range", http.StatusRequestedRangeNotSatisfiable)
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return nil
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}
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}
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sendSize := rangesMIMESize(ranges, mimeType, totalSize)
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pr, pw := io.Pipe()
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mw := multipart.NewWriter(pw)
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w.Header().Set("Content-Type", "multipart/byteranges; boundary="+mw.Boundary())
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sendContent := pr
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defer pr.Close() // cause writing goroutine to fail and exit if CopyN doesn't finish.
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go func() {
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for _, ra := range ranges {
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part, e := mw.CreatePart(ra.mimeHeader(mimeType, totalSize))
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if e != nil {
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pw.CloseWithError(e)
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return
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}
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if _, e = rs.Seek(ra.start, 0); e != nil {
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pw.CloseWithError(e)
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return
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}
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if _, e = io.CopyN(part, rs, ra.length); e != nil {
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pw.CloseWithError(e)
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return
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}
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}
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mw.Close()
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pw.Close()
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}()
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if w.Header().Get("Content-Encoding") == "" {
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w.Header().Set("Content-Length", strconv.FormatInt(sendSize, 10))
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}
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w.WriteHeader(http.StatusPartialContent)
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_, e = io.CopyN(w, sendContent, sendSize)
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return e
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}
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