s3: place multipart part chunks by the destination object's storage rule (#10845)

Multipart parts stage under /buckets/<bucket>/.uploads/<id>/, so the filer
resolved filer.conf storage rules against that path when the gateway assigned
volumes for them. A rule scoped to a key prefix - fs.configure
-locationPrefix=/buckets/b/data/ -ttl=30d - then matched a small object but not
the parts of a large one, so an object whose entry carried the rule's TTL had
its bytes spread over TTL-less volumes.

Assign part chunks against the destination object's filer path instead, the way
the x-seaweedfs-destination header made the filer resolve it before the S3 write
path moved off the filer proxy. Covers PutObjectPart and both UploadPartCopy
paths. The part entry itself is still written under .uploads, so a read-only
rule there still rejects it.

The lifecycle XML Expiration.Days TTL keeps passing 0 for parts: that rule
targets the user-visible object key and would start its clock before
CompleteMultipartUpload.

weed/s3api/s3api_object_handlers_copy.go

@@ -1003,7 +1003,7 @@ func (s3a *S3ApiServer) CopyObjectPartHandler(w http.ResponseWriter, r *http.Req
 	}
 
 	if uploadEntryHasSSE(uploadEntry) || sourceEntryHasSSE(entry) || uploadEntryHasChecksum(uploadEntry) {
-		etag, sseMetadata, errCode := s3a.copyObjectPartViaReencryption(r, entry, startOffset, endOffset, dstBucket, uploadID, partID, uploadEntry)
+		etag, sseMetadata, errCode := s3a.copyObjectPartViaReencryption(r, entry, startOffset, endOffset, dstBucket, dstObject, uploadID, partID, uploadEntry)
 		if errCode != s3err.ErrNone {
 			s3err.WriteErrorResponse(w, r, errCode)
 			return
@@ -1040,14 +1040,16 @@ func (s3a *S3ApiServer) CopyObjectPartHandler(w http.ResponseWriter, r *http.Req
 		Extended: make(map[string][]byte),
 	}
 
-	// The copied part lives under the destination bucket's .uploads folder.
-	// Assign destination volumes against that real filer path so they land in
-	// the destination bucket's collection. r.URL.Path is the S3 request URI
-	// (e.g. /bucket/key), not a filer path, so passing it would skip the
-	// filer's bucket-to-collection mapping and route the copied bytes to the
-	// default collection.
 	uploadDir, partName := s3a.copyPartLocation(dstBucket, uploadID, partID)
-	dstPartPath := uploadDir + "/" + partName
+
+	// The copied part entry lives under the destination bucket's .uploads
+	// folder, but its bytes become the object, so assign destination volumes
+	// against the destination object's filer path: that is the path filer.conf
+	// storage rules and the bucket-to-collection mapping are written for.
+	// r.URL.Path is the S3 request URI (e.g. /bucket/key), not a filer path, so
+	// passing it would skip the mapping and route the copied bytes to the
+	// default collection.
+	dstAssignPath := s3a.toFilerPath(dstBucket, dstObject)
 
 	// Handle zero-size files or empty ranges
 	if entry.Attributes.FileSize == 0 || endOffset < startOffset {
@@ -1056,7 +1058,7 @@ func (s3a *S3ApiServer) CopyObjectPartHandler(w http.ResponseWriter, r *http.Req
 		dstEntry.Chunks = nil
 	} else {
 		// Copy chunks that overlap with the range
-		dstChunks, err := s3a.copyChunksForRange(entry, startOffset, endOffset, dstPartPath)
+		dstChunks, err := s3a.copyChunksForRange(entry, startOffset, endOffset, dstAssignPath)
 		if err != nil {
 			glog.Errorf("CopyObjectPartHandler copy chunks error: %v", err)
 			s3err.WriteErrorResponse(w, r, s3err.ErrInternalError)