seaweedfs/weed/server/volume_server_handlers_read.go

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package weed_server
import (
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"bytes"
"io"
"mime"
"mime/multipart"
"net/http"
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"net/url"
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"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.GetMaster(), 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)
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if e != nil || count < 0 {
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glog.V(0).Infof("read %s error: %v", r.URL.Path, e)
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
}
}
}
}
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if inm := r.Header.Get("If-None-Match"); inm == "\""+n.Etag()+"\"" {
w.WriteHeader(http.StatusNotModified)
return
}
if r.Header.Get("ETag-MD5") == "True" {
setEtag(w, n.MD5())
}else{
setEtag(w, n.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)
}
}
}
}
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rs := conditionallyResizeImages(bytes.NewReader(n.Data), ext, r)
if e := writeResponseContent(filename, mtype, rs, 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 {
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glog.V(0).Infof("load chunked manifest (%s) error: %v", r.URL.Path, e)
return false
}
if fileName == "" && chunkManifest.Name != "" {
fileName = chunkManifest.Name
}
ext := path.Ext(fileName)
mType := ""
if chunkManifest.Mime != "" {
mt := chunkManifest.Mime
if !strings.HasPrefix(mt, "application/octet-stream") {
mType = mt
}
}
w.Header().Set("X-File-Store", "chunked")
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chunkedFileReader := &operation.ChunkedFileReader{
Manifest: chunkManifest,
Master: vs.GetMaster(),
}
defer chunkedFileReader.Close()
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rs := conditionallyResizeImages(chunkedFileReader, ext, r)
if e := writeResponseContent(fileName, mType, rs, w, r); e != nil {
glog.V(2).Infoln("response write error:", e)
}
return true
}
func conditionallyResizeImages(originalDataReaderSeeker io.ReadSeeker, ext string, r *http.Request) io.ReadSeeker {
rs := originalDataReaderSeeker
if len(ext) > 0 {
ext = strings.ToLower(ext)
}
if ext == ".png" || ext == ".jpg" || ext == ".jpeg" || 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"))
}
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rs, _, _ = images.Resized(ext, originalDataReaderSeeker, width, height, r.FormValue("mode"))
}
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return rs
}
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
}