refactor(*): 稳定期治理 - 收敛核心架构、错误语义并修复跨项目数据竞态

backend/internal/service/user_data_test.go

@@ -8,9 +8,37 @@ import (
 	"infinite-canvas/backend/internal/model"
 )
 
+func testUserAssetPayload(kind string, extra map[string]any) map[string]any {
+	payload := map[string]any{
+		"id":       "asset-1",
+		"kind":     kind,
+		"title":    "测试资产",
+		"coverUrl": "",
+		"tags":     []string{},
+	}
+	switch kind {
+	case "image":
+		payload["data"] = map[string]any{"dataUrl": "https://example.com/a.png", "width": 1, "height": 1, "bytes": 1, "mimeType": "image/png"}
+	case "video":
+		payload["data"] = map[string]any{"url": "https://example.com/a.mp4", "width": 1, "height": 1, "bytes": 1, "mimeType": "video/mp4"}
+	case "audio":
+		payload["data"] = map[string]any{"url": "https://example.com/a.mp3", "bytes": 1, "mimeType": "audio/mpeg"}
+	case "model":
+		payload["data"] = map[string]any{"url": "https://example.com/a.glb", "bytes": 1, "mimeType": "model/gltf-binary", "fileName": "a.glb"}
+	case "text":
+		payload["data"] = map[string]any{"content": "正文"}
+	default:
+		payload["data"] = map[string]any{"definition": map[string]any{}}
+	}
+	for key, value := range extra {
+		payload[key] = value
+	}
+	return payload
+}
+
 func TestAssetFromJSONAcceptsDeterministicGenerationID(t *testing.T) {
 	id := "generation_" + strings.Repeat("a", 64)
-	raw, err := json.Marshal(map[string]any{"id": id, "kind": "image", "title": "生成图片"})
+	raw, err := json.Marshal(testUserAssetPayload("image", map[string]any{"id": id, "title": "生成图片"}))
 	if err != nil {
 		t.Fatalf("marshal asset: %v", err)
 	}
@@ -41,7 +69,7 @@ func TestAssetFromJSONNormalizesLegacyAndUnclassifiedMediaCategories(t *testing.
 	}
 	for _, test := range tests {
 		t.Run(test.name, func(t *testing.T) {
-			raw, err := json.Marshal(map[string]any{"id": "asset-1", "kind": test.kind, "category": test.category, "title": "测试资产"})
+			raw, err := json.Marshal(testUserAssetPayload(test.kind, map[string]any{"category": test.category}))
 			if err != nil {
 				t.Fatal(err)
 			}
@@ -56,6 +84,37 @@ func TestAssetFromJSONNormalizesLegacyAndUnclassifiedMediaCategories(t *testing.
 	}
 }
 
+func TestAssetFromJSONRejectsIncompleteLibraryPayload(t *testing.T) {
+	tests := []struct {
+		name    string
+		payload map[string]any
+		want    string
+	}{
+		{name: "missing tags", payload: testUserAssetPayload("image", map[string]any{"tags": nil}), want: "tags"},
+		{name: "malformed tags", payload: testUserAssetPayload("image", map[string]any{"tags": []any{"角色", 1}}), want: "tags"},
+		{name: "missing data", payload: testUserAssetPayload("image", map[string]any{"data": nil}), want: "data"},
+		{name: "image missing locator", payload: testUserAssetPayload("image", map[string]any{"data": map[string]any{"dataUrl": "", "width": 1, "height": 1, "bytes": 1, "mimeType": "image/png"}}), want: "dataUrl 或 storageKey"},
+	}
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			if test.name == "missing tags" {
+				delete(test.payload, "tags")
+			}
+			if test.name == "missing data" {
+				delete(test.payload, "data")
+			}
+			raw, err := json.Marshal(test.payload)
+			if err != nil {
+				t.Fatal(err)
+			}
+			_, err = assetFromJSON("user-1", raw)
+			if err == nil || !strings.Contains(err.Error(), test.want) {
+				t.Fatalf("assetFromJSON error = %v, want %q", err, test.want)
+			}
+		})
+	}
+}
+
 func TestAssetFromJSONRejectsIDOverLimit(t *testing.T) {
 	raw, err := json.Marshal(map[string]any{"id": strings.Repeat("a", model.AssetIDMaxLength+1), "kind": "image"})
 	if err != nil {