test(api): add tests for file variable serialization logic.

api/controllers/console/app/workflow_draft_variables_test.py

@@ -194,3 +194,98 @@ def test_workflow_node_variables_fields():
     item_dict = resp["items"][0]
     assert item_dict["name"] == "conv_var"
     assert item_dict["value"] == 1
+
+
+def test_workflow_file_variable_with_signed_url():
+    """Test that File type variables include signed URLs in API responses."""
+    from core.file.enums import FileTransferMethod, FileType
+    from core.file.models import File
+
+    # Create a File object with LOCAL_FILE transfer method (which generates signed URLs)
+    test_file = File(
+        id="test_file_id",
+        tenant_id="test_tenant_id",
+        type=FileType.IMAGE,
+        transfer_method=FileTransferMethod.LOCAL_FILE,
+        related_id="test_upload_file_id",
+        filename="test.jpg",
+        extension=".jpg",
+        mime_type="image/jpeg",
+        size=12345,
+    )
+
+    # Create a WorkflowDraftVariable with the File
+    file_var = WorkflowDraftVariable.new_node_variable(
+        app_id=_TEST_APP_ID, node_id="test_node", name="file_var", value=build_segment(test_file)
+    )
+
+    # Marshal the variable using the API fields
+    resp = marshal(WorkflowDraftVariableList(variables=[file_var]), _WORKFLOW_DRAFT_VARIABLE_LIST_FIELDS)
+
+    # Verify the response structure
+    assert isinstance(resp, dict)
+    assert len(resp["items"]) == 1
+    item_dict = resp["items"][0]
+    assert item_dict["name"] == "file_var"
+
+    # Verify the value is a dict (File.to_dict() result) and contains expected fields
+    value = item_dict["value"]
+    assert isinstance(value, dict)
+
+    # Verify the File fields are preserved
+    assert value["id"] == test_file.id
+    assert value["filename"] == test_file.filename
+    assert value["type"] == test_file.type.value
+    assert value["transfer_method"] == test_file.transfer_method.value
+    assert value["size"] == test_file.size
+
+    # Verify the URL is present (it should be a signed URL for LOCAL_FILE transfer method)
+    remote_url = value["remote_url"]
+    assert remote_url is not None
+
+    assert isinstance(remote_url, str)
+    # For LOCAL_FILE, the URL should contain signature parameters
+    assert "timestamp=" in remote_url
+    assert "nonce=" in remote_url
+    assert "sign=" in remote_url
+
+
+def test_workflow_file_variable_remote_url():
+    """Test that File type variables with REMOTE_URL transfer method return the remote URL."""
+    from core.file.enums import FileTransferMethod, FileType
+    from core.file.models import File
+
+    # Create a File object with REMOTE_URL transfer method
+    test_file = File(
+        id="test_file_id",
+        tenant_id="test_tenant_id",
+        type=FileType.IMAGE,
+        transfer_method=FileTransferMethod.REMOTE_URL,
+        remote_url="https://example.com/test.jpg",
+        filename="test.jpg",
+        extension=".jpg",
+        mime_type="image/jpeg",
+        size=12345,
+    )
+
+    # Create a WorkflowDraftVariable with the File
+    file_var = WorkflowDraftVariable.new_node_variable(
+        app_id=_TEST_APP_ID, node_id="test_node", name="file_var", value=build_segment(test_file)
+    )
+
+    # Marshal the variable using the API fields
+    resp = marshal(WorkflowDraftVariableList(variables=[file_var]), _WORKFLOW_DRAFT_VARIABLE_LIST_FIELDS)
+
+    # Verify the response structure
+    assert isinstance(resp, dict)
+    assert len(resp["items"]) == 1
+    item_dict = resp["items"][0]
+    assert item_dict["name"] == "file_var"
+
+    # Verify the value is a dict (File.to_dict() result) and contains expected fields
+    value = item_dict["value"]
+    assert isinstance(value, dict)
+    remote_url = value["remote_url"]
+
+    # For REMOTE_URL, the URL should be the original remote URL
+    assert remote_url == test_file.remote_url