[s3] fix s3 test_multipart_get_part (#5476)

* try fix s3  test_multipart_get_part

* add passed s3 tests

* fix SeaweedFSUploadId

* rm spaces

* convert part request to range

* add passed s3 tests of multipart

weed/server/filer_server_handlers_read.go

@@ -3,6 +3,8 @@ package weed_server
 import (
 	"bytes"
 	"context"
+	"encoding/base64"
+	"encoding/hex"
 	"errors"
 	"fmt"
 	"io"
@@ -132,7 +134,7 @@ func (fs *FilerServer) GetOrHeadHandler(w http.ResponseWriter, r *http.Request)
 			return
 		}
 		// inform S3 API this is a user created directory key object
-		w.Header().Set(s3_constants.X_SeaweedFS_Header_Directory_Key, "true")
+		w.Header().Set(s3_constants.SeaweedFSIsDirectoryKey, "true")
 	}
 
 	if isForDirectory && entry.Attr.Mime != s3_constants.FolderMimeType {
@@ -158,7 +160,22 @@ func (fs *FilerServer) GetOrHeadHandler(w http.ResponseWriter, r *http.Request)
 		return
 	}
 
-	etag := filer.ETagEntry(entry)
+	var etag string
+	if partNumber, errNum := strconv.Atoi(r.Header.Get(s3_constants.SeaweedFSPartNumber)); errNum == nil {
+		if len(entry.Chunks) < partNumber {
+			stats.FilerHandlerCounter.WithLabelValues(stats.ErrorReadChunk).Inc()
+			w.WriteHeader(http.StatusBadRequest)
+			w.Write([]byte("InvalidPart"))
+			return
+		}
+		w.Header().Set(s3_constants.AmzMpPartsCount, strconv.Itoa(len(entry.Chunks)))
+		partChunk := entry.GetChunks()[partNumber-1]
+		md5, _ := base64.StdEncoding.DecodeString(partChunk.ETag)
+		etag = hex.EncodeToString(md5)
+		r.Header.Set("Range", fmt.Sprintf("bytes=%d-%d", partChunk.Offset, uint64(partChunk.Offset)+partChunk.Size-1))
+	} else {
+		etag = filer.ETagEntry(entry)
+	}
 	w.Header().Set("Accept-Ranges", "bytes")
 
 	// mime type
@@ -207,7 +224,6 @@ func (fs *FilerServer) GetOrHeadHandler(w http.ResponseWriter, r *http.Request)
 
 	filename := entry.Name()
 	adjustPassthroughHeaders(w, r, filename)
-
 	totalSize := int64(entry.Size())
 
 	if r.Method == "HEAD" {