do md5 validation AFTER decompression

weed/storage/needle/needle_parse_upload.go

@@ -81,6 +81,16 @@ func ParseUpload(r *http.Request, sizeLimit int64) (pu *ParsedUpload, e error) {
 			}
 		}
 	}
+
+	if expectedChecksum := r.Header.Get("Content-MD5"); expectedChecksum != "" {
+		h := md5.New()
+		h.Write(pu.UncompressedData)
+		if receivedChecksum := fmt.Sprintf("%x", h.Sum(nil)); expectedChecksum != receivedChecksum {
+			e = fmt.Errorf("Content-MD5 did not match md5 of file data [%s] != [%s]", expectedChecksum, receivedChecksum)
+			return
+		}
+	}
+
 	return
 }
 
@@ -96,21 +106,6 @@ func parsePut(r *http.Request, sizeLimit int64, pu *ParsedUpload) (e error) {
 	return nil
 }
 
-type ChecksumReader struct {
-	h hash.Hash
-	r io.Reader
-}
-
-func (cr *ChecksumReader) Read(p []byte) (int, error) {
-	n, err := cr.r.Read(p)
-	cr.h.Write(p[:n])
-	return n, err
-}
-
-func (cr *ChecksumReader) Checksum() string {
-	return fmt.Sprintf("%x", cr.h.Sum(nil))
-}
-
 func parseMultipart(r *http.Request, sizeLimit int64, pu *ParsedUpload) (e error) {
 	defer func() {
 		if e != nil && r.Body != nil {
@@ -138,26 +133,7 @@ func parseMultipart(r *http.Request, sizeLimit int64, pu *ParsedUpload) (e error
 		pu.FileName = path.Base(pu.FileName)
 	}
 
-	reader := io.LimitReader(part, sizeLimit+1)
-	if expectedChecksum := r.Header.Get("Content-MD5"); expectedChecksum != "" {
-		if r.Header.Get("Content-Encoding") == "gzip" {
-			gr, err := gzip.NewReader(reader)
-			if err != nil {
-				e = fmt.Errorf("Content-Encoding == gzip but content was not gzipped: %s", err)
-				return
-			}
-			reader = gr
-		}
-		cr := &ChecksumReader{md5.New(), reader}
-		pu.Data, e = ioutil.ReadAll(cr)
-		if expectedChecksum != cr.Checksum() {
-			e = fmt.Errorf("Content-MD5 did not match md5 of file data [%s] != [%s]", expectedChecksum, cr.Checksum())
-			return
-		}
-	} else {
-		pu.Data, e = ioutil.ReadAll(reader)
-	}
-
+	pu.Data, e = ioutil.ReadAll(io.LimitReader(part, sizeLimit+1))
 	if e != nil {
 		glog.V(0).Infoln("Reading Content [ERROR]", e)
 		return