Bind all canvas element identities to their snapshot owners

2026-11-09 04:11:26 +08:00
parent ad6ab30b5f
commit 9cf6e4cedf
2 changed files with 29 additions and 1 deletions
@@ -20,6 +20,7 @@ func writeCanvasModelStream(ctx context.Context, w http.ResponseWriter, model ca
 	view := model.view(nil)
 	// A count covers direct members only; an empty canvas is explicit too.
 	counts := map[string]int{}
+	owners := map[string]string{}
 	for _, canvas := range view.Canvases {
 		counts[canvas.ID] = 0
 	}
@@ -29,11 +30,17 @@ func writeCanvasModelStream(ctx context.Context, w http.ResponseWriter, model ca
 			reject(w, 500, "invalid_model_coverage")
 			return
 		}
+		id := modelString(element["id"])
+		if id == "" || owners[id] != "" {
+			reject(w, 500, "invalid_model_identity")
+			return
+		}
+		owners[id] = owner
 		counts[owner]++
 	}
 	header := response{"streamVersion": 1, "kind": "header", "sequence": 0, "snapshotToken": token,
 		"documentFormatVersion": canvasModelFormat, "projectId": model.Root, "canvases": view.Canvases,
-		"versions": view.Versions, "tombstones": view.Tombstones, "removedCanvasIds": view.Removed, "elementCount": len(view.Elements), "canvasElementCounts": counts}
+		"versions": view.Versions, "tombstones": view.Tombstones, "removedCanvasIds": view.Removed, "elementCount": len(view.Elements), "canvasElementCounts": counts, "elementOwners": owners}
 	const maxLine = 8 * 1024 * 1024
 	const maxBytes = 64 * 1024 * 1024
 	sequence, total := 0, 0