Ensure actual object size is sent in notification (#8418)

Fixes: #8407

cmd/notification.go

@@ -1191,6 +1191,15 @@ func (args eventArgs) ToEvent() event.Event {
 func sendEvent(args eventArgs) {
 
 	// remove sensitive encryption entries in metadata.
+	switch {
+	case crypto.IsEncrypted(args.Object.UserDefined):
+		if totalObjectSize, err := args.Object.DecryptedSize(); err == nil {
+			args.Object.Size = totalObjectSize
+		}
+	case args.Object.IsCompressed():
+		args.Object.Size = args.Object.GetActualSize()
+	}
+
 	crypto.RemoveSensitiveEntries(args.Object.UserDefined)
 	crypto.RemoveInternalEntries(args.Object.UserDefined)
 

cmd/object-handlers.go

@@ -1272,7 +1272,6 @@ func (api objectAPIHandlers) PutObjectHandler(w http.ResponseWriter, r *http.Req
 
 	if objectAPI.IsEncryptionSupported() {
 		if crypto.IsEncrypted(objInfo.UserDefined) {
-			objInfo.Size, _ = objInfo.DecryptedSize()
 			switch {
 			case crypto.S3.IsEncrypted(objInfo.UserDefined):
 				w.Header().Set(crypto.SSEHeader, crypto.SSEAlgorithmAES256)
@@ -2337,13 +2336,6 @@ func (api objectAPIHandlers) CompleteMultipartUploadHandler(w http.ResponseWrite
 	// Write success response.
 	writeSuccessResponseXML(w, encodedSuccessResponse)
 
-	// Get host and port from Request.RemoteAddr.
-	if objectAPI.IsEncryptionSupported() {
-		if crypto.IsEncrypted(objInfo.UserDefined) {
-			objInfo.Size, _ = objInfo.DecryptedSize()
-		}
-	}
-
 	// Notify object created event.
 	sendEvent(eventArgs{
 		EventName:    event.ObjectCreatedCompleteMultipartUpload,