[i18n] Add /i18n endpoint to provide all custom node translations (#6558)

* [i18n] Add /i18n endpoint to provide all custom node translations

* Sort glob result for deterministic ordering

* Update comment

tests-unit/app_test/custom_node_manager_test.py

@@ -2,39 +2,146 @@ import pytest
 from aiohttp import web
 from unittest.mock import patch
 from app.custom_node_manager import CustomNodeManager
+import json
 
 pytestmark = (
     pytest.mark.asyncio
 )  # This applies the asyncio mark to all test functions in the module
 
+
 @pytest.fixture
 def custom_node_manager():
     return CustomNodeManager()
 
+
 @pytest.fixture
 def app(custom_node_manager):
     app = web.Application()
     routes = web.RouteTableDef()
-    custom_node_manager.add_routes(routes, app, [("ComfyUI-TestExtension1", "ComfyUI-TestExtension1")])
+    custom_node_manager.add_routes(
+        routes, app, [("ComfyUI-TestExtension1", "ComfyUI-TestExtension1")]
+    )
     app.add_routes(routes)
     return app
 
+
 async def test_get_workflow_templates(aiohttp_client, app, tmp_path):
     client = await aiohttp_client(app)
     # Setup temporary custom nodes file structure with 1 workflow file
     custom_nodes_dir = tmp_path / "custom_nodes"
-    example_workflows_dir = custom_nodes_dir / "ComfyUI-TestExtension1" / "example_workflows"
+    example_workflows_dir = (
+        custom_nodes_dir / "ComfyUI-TestExtension1" / "example_workflows"
+    )
     example_workflows_dir.mkdir(parents=True)
     template_file = example_workflows_dir / "workflow1.json"
-    template_file.write_text('')
+    template_file.write_text("")
 
-    with patch('folder_paths.folder_names_and_paths', {
-        'custom_nodes': ([str(custom_nodes_dir)], None)
-    }):
-        response = await client.get('/workflow_templates')
+    with patch(
+        "folder_paths.folder_names_and_paths",
+        {"custom_nodes": ([str(custom_nodes_dir)], None)},
+    ):
+        response = await client.get("/workflow_templates")
         assert response.status == 200
         workflows_dict = await response.json()
         assert isinstance(workflows_dict, dict)
         assert "ComfyUI-TestExtension1" in workflows_dict
         assert isinstance(workflows_dict["ComfyUI-TestExtension1"], list)
         assert workflows_dict["ComfyUI-TestExtension1"][0] == "workflow1"
+
+
+async def test_build_translations_empty_when_no_locales(custom_node_manager, tmp_path):
+    custom_nodes_dir = tmp_path / "custom_nodes"
+    custom_nodes_dir.mkdir(parents=True)
+
+    with patch("folder_paths.get_folder_paths", return_value=[str(custom_nodes_dir)]):
+        translations = custom_node_manager.build_translations()
+        assert translations == {}
+
+
+async def test_build_translations_loads_all_files(custom_node_manager, tmp_path):
+    # Setup test directory structure
+    custom_nodes_dir = tmp_path / "custom_nodes" / "test-extension"
+    locales_dir = custom_nodes_dir / "locales" / "en"
+    locales_dir.mkdir(parents=True)
+
+    # Create test translation files
+    main_content = {"title": "Test Extension"}
+    (locales_dir / "main.json").write_text(json.dumps(main_content))
+
+    node_defs = {"node1": "Node 1"}
+    (locales_dir / "nodeDefs.json").write_text(json.dumps(node_defs))
+
+    commands = {"cmd1": "Command 1"}
+    (locales_dir / "commands.json").write_text(json.dumps(commands))
+
+    settings = {"setting1": "Setting 1"}
+    (locales_dir / "settings.json").write_text(json.dumps(settings))
+
+    with patch(
+        "folder_paths.get_folder_paths", return_value=[tmp_path / "custom_nodes"]
+    ):
+        translations = custom_node_manager.build_translations()
+
+        assert translations == {
+            "en": {
+                "title": "Test Extension",
+                "nodeDefs": {"node1": "Node 1"},
+                "commands": {"cmd1": "Command 1"},
+                "settings": {"setting1": "Setting 1"},
+            }
+        }
+
+
+async def test_build_translations_handles_invalid_json(custom_node_manager, tmp_path):
+    # Setup test directory structure
+    custom_nodes_dir = tmp_path / "custom_nodes" / "test-extension"
+    locales_dir = custom_nodes_dir / "locales" / "en"
+    locales_dir.mkdir(parents=True)
+
+    # Create valid main.json
+    main_content = {"title": "Test Extension"}
+    (locales_dir / "main.json").write_text(json.dumps(main_content))
+
+    # Create invalid JSON file
+    (locales_dir / "nodeDefs.json").write_text("invalid json{")
+
+    with patch(
+        "folder_paths.get_folder_paths", return_value=[tmp_path / "custom_nodes"]
+    ):
+        translations = custom_node_manager.build_translations()
+
+        assert translations == {
+            "en": {
+                "title": "Test Extension",
+            }
+        }
+
+
+async def test_build_translations_merges_multiple_extensions(
+    custom_node_manager, tmp_path
+):
+    # Setup test directory structure for two extensions
+    custom_nodes_dir = tmp_path / "custom_nodes"
+    ext1_dir = custom_nodes_dir / "extension1" / "locales" / "en"
+    ext2_dir = custom_nodes_dir / "extension2" / "locales" / "en"
+    ext1_dir.mkdir(parents=True)
+    ext2_dir.mkdir(parents=True)
+
+    # Create translation files for extension 1
+    ext1_main = {"title": "Extension 1", "shared": "Original"}
+    (ext1_dir / "main.json").write_text(json.dumps(ext1_main))
+
+    # Create translation files for extension 2
+    ext2_main = {"description": "Extension 2", "shared": "Override"}
+    (ext2_dir / "main.json").write_text(json.dumps(ext2_main))
+
+    with patch("folder_paths.get_folder_paths", return_value=[str(custom_nodes_dir)]):
+        translations = custom_node_manager.build_translations()
+
+        assert translations == {
+            "en": {
+                "title": "Extension 1",
+                "description": "Extension 2",
+                "shared": "Override",  # Second extension should override first
+            }
+        }