Move the session auth backend to FAB auth manager (apache#42878)

providers/src/airflow/providers/fab/auth_manager/api/auth/backend/session.py

@@ -0,0 +1,47 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+"""Session authentication backend."""
+
+from __future__ import annotations
+
+from functools import wraps
+from typing import Any, Callable, TypeVar, cast
+
+from flask import Response
+
+from airflow.www.extensions.init_auth_manager import get_auth_manager
+
+CLIENT_AUTH: tuple[str, str] | Any | None = None
+
+
+def init_app(_):
+    """Initialize authentication backend."""
+
+
+T = TypeVar("T", bound=Callable)
+
+
+def requires_authentication(function: T):
+    """Decorate functions that require authentication."""
+
+    @wraps(function)
+    def decorated(*args, **kwargs):
+        if not get_auth_manager().is_logged_in():
+            return Response("Unauthorized", 401, {})
+        return function(*args, **kwargs)
+
+    return cast(T, decorated)

providers/tests/fab/auth_manager/api/auth/backend/test_session.py

@@ -0,0 +1,73 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+from __future__ import annotations
+
+from unittest.mock import Mock, patch
+
+import pytest
+from flask import Response
+
+from airflow.providers.fab.auth_manager.api.auth.backend.session import requires_authentication
+from airflow.www import app as application
+
+from dev.tests_common.test_utils.compat import AIRFLOW_V_2_9_PLUS
+
+pytestmark = [
+    pytest.mark.skipif(not AIRFLOW_V_2_9_PLUS, reason="Tests for Airflow 2.9.0+ only"),
+]
+
+
+@pytest.fixture
+def app():
+    return application.create_app(testing=True)
+
+
+mock_call = Mock()
+
+
+@requires_authentication
+def function_decorated():
+    mock_call()
+
+
+@pytest.mark.db_test
+class TestSessionAuth:
+    def setup_method(self) -> None:
+        mock_call.reset_mock()
+
+    @patch("airflow.providers.fab.auth_manager.api.auth.backend.session.get_auth_manager")
+    def test_requires_authentication_when_not_authenticated(self, mock_get_auth_manager, app):
+        auth_manager = Mock()
+        auth_manager.is_logged_in.return_value = False
+        mock_get_auth_manager.return_value = auth_manager
+        with app.test_request_context() as mock_context:
+            mock_context.request.authorization = None
+            result = function_decorated()
+
+        assert type(result) is Response
+        assert result.status_code == 401
+
+    @patch("airflow.providers.fab.auth_manager.api.auth.backend.session.get_auth_manager")
+    def test_requires_authentication_when_authenticated(self, mock_get_auth_manager, app):
+        auth_manager = Mock()
+        auth_manager.is_logged_in.return_value = True
+        mock_get_auth_manager.return_value = auth_manager
+        with app.test_request_context() as mock_context:
+            mock_context.request.authorization = None
+            function_decorated()
+
+        mock_call.assert_called_once()