func (dh *DownloadHandler) ServeHTTP(rw http.ResponseWriter, req *http.Request, file blob.Ref) {
if req.Method != "GET" && req.Method != "HEAD" {
http.Error(rw, "Invalid download method", 400)
return
}
if req.Header.Get("If-Modified-Since") != "" {
// Immutable, so any copy's a good copy.
rw.WriteHeader(http.StatusNotModified)
return
}
fr, err := schema.NewFileReader(dh.blobSource(), file)
if err != nil {
http.Error(rw, "Can't serve file: "+err.Error(), 500)
return
}
defer fr.Close()
schema := fr.FileSchema()
h := rw.Header()
h.Set("Content-Length", fmt.Sprintf("%d", schema.SumPartsSize()))
h.Set("Expires", time.Now().Add(oneYear).Format(http.TimeFormat))
mimeType := magic.MIMETypeFromReaderAt(fr)
if dh.ForceMime != "" {
mimeType = dh.ForceMime
}
if mimeType == "" {
mimeType = "application/octet-stream"
}
h.Set("Content-Type", mimeType)
if mimeType == "application/octet-stream" {
// Chrome seems to silently do nothing on
// application/octet-stream unless this is set.
// Maybe it's confused by lack of URL it recognizes
// along with lack of mime type?
rw.Header().Set("Content-Disposition", "attachment; filename=file-"+file.String()+".dat")
}
if req.Method == "HEAD" && req.FormValue("verifycontents") != "" {
vbr, ok := blob.Parse(req.FormValue("verifycontents"))
if !ok {
return
}
hash := vbr.Hash()
if hash == nil {
return
}
io.Copy(hash, fr) // ignore errors, caught later
if vbr.HashMatches(hash) {
rw.Header().Set("X-Camli-Contents", vbr.String())
}
return
}
http.ServeContent(rw, req, "", time.Now(), fr)
}
func (dh *DownloadHandler) ServeHTTP(rw http.ResponseWriter, req *http.Request, file *blobref.BlobRef) {
if req.Method != "GET" && req.Method != "HEAD" {
http.Error(rw, "Invalid download method", 400)
return
}
fr, err := schema.NewFileReader(dh.storageSeekFetcher(), file)
if err != nil {
http.Error(rw, "Can't serve file: "+err.Error(), 500)
return
}
defer fr.Close()
schema := fr.FileSchema()
rw.Header().Set("Content-Length", fmt.Sprintf("%d", schema.SumPartsSize()))
mimeType, reader := magic.MimeTypeFromReader(fr)
if dh.ForceMime != "" {
mimeType = dh.ForceMime
}
if mimeType == "" {
mimeType = "application/octet-stream"
}
rw.Header().Set("Content-Type", mimeType)
if mimeType == "application/octet-stream" {
// Chrome seems to silently do nothing on
// application/octet-stream unless this is set.
// Maybe it's confused by lack of URL it recognizes
// along with lack of mime type?
rw.Header().Set("Content-Disposition", "attachment; filename=file-"+file.String()+".dat")
}
if req.Method == "HEAD" {
vbr := blobref.Parse(req.FormValue("verifycontents"))
if vbr == nil {
return
}
hash := vbr.Hash()
if hash == nil {
return
}
io.Copy(hash, reader) // ignore errors, caught later
if vbr.HashMatches(hash) {
rw.Header().Set("X-Camli-Contents", vbr.String())
}
return
}
n, err := io.Copy(rw, reader)
log.Printf("For %q request of %s: copied %d, %v", req.Method, req.URL.Path, n, err)
if err != nil {
log.Printf("error serving download of file schema %s: %v", file, err)
return
}
if size := schema.SumPartsSize(); n != int64(size) {
log.Printf("error serving download of file schema %s: sent %d, expected size of %d",
file, n, size)
return
}
}