Added dependency to inject swagger in the route.

Author: s3rius

README.md

@@ -357,7 +357,15 @@ async def my_handler(var: str = Depends(Path())):
 ```
 
 
-## Overridiing dependencies
+## ExtraOpenAPI
+
+This dependency is used to add additional swagger fields to the endpoint's swagger
+that is using this dependency. It might be even indirect dependency.
+
+You can check how this thing can be used in our [examples/swagger_auth.py](https://github.com/taskiq-python/aiohttp-deps/tree/master/examples/swagger_auth.py).
+
+
+## Overriding dependencies
 
 Sometimes for tests you don't want to calculate actual functions
 and you want to pass another functions instead.

aiohttp_deps/__init__.py

@@ -6,7 +6,7 @@
 from aiohttp_deps.keys import DEPENDENCY_OVERRIDES_KEY, VALUES_OVERRIDES_KEY
 from aiohttp_deps.router import Router
 from aiohttp_deps.swagger import extra_openapi, openapi_response, setup_swagger
-from aiohttp_deps.utils import Form, Header, Json, Path, Query
+from aiohttp_deps.utils import ExtraOpenAPI, Form, Header, Json, Path, Query
 from aiohttp_deps.view import View
 
 __all__ = [
@@ -21,6 +21,7 @@
     "Query",
     "Form",
     "Path",
+    "ExtraOpenAPI",
     "openapi_response",
     "DEPENDENCY_OVERRIDES_KEY",
     "VALUES_OVERRIDES_KEY",

aiohttp_deps/swagger.py

@@ -6,6 +6,7 @@
     Awaitable,
     Callable,
     Dict,
+    List,
     Optional,
     Tuple,
     TypeVar,
@@ -19,7 +20,7 @@
 
 from aiohttp_deps.initializer import InjectableFuncHandler, InjectableViewHandler
 from aiohttp_deps.keys import SWAGGER_SCHEMA_KEY
-from aiohttp_deps.utils import Form, Header, Json, Path, Query
+from aiohttp_deps.utils import ExtraOpenAPI, Form, Header, Json, Path, Query
 
 _T = TypeVar("_T")
 
@@ -119,6 +120,7 @@ def _add_route_def(  # noqa: C901
         openapi_schema["components"]["schemas"].update(extra_openapi_schemas)
 
     params: Dict[Tuple[str, str], Any] = {}
+    updaters: List[Callable[[Dict[str, Any]], None]] = []
 
     def _insert_in_params(data: Dict[str, Any]) -> None:
         element = params.get((data["name"], data["in"]))
@@ -191,8 +193,18 @@ def _insert_in_params(data: Dict[str, Any]) -> None:
                     "schema": schema,
                 },
             )
+        elif isinstance(dependency.dependency, ExtraOpenAPI):
+            if dependency.dependency.updater is not None:
+                updaters.append(dependency.dependency.updater)
+            if dependency.dependency.extra_openapi is not None:
+                extra_openapi = always_merger.merge(
+                    extra_openapi,
+                    dependency.dependency.extra_openapi,
+                )
 
     route_info["parameters"] = list(params.values())
+    for updater in updaters:
+        updater(route_info)
     openapi_schema["paths"][route.resource.canonical].update(
         {method.lower(): always_merger.merge(route_info, extra_openapi)},
     )
@@ -207,6 +219,7 @@ def setup_swagger(  # noqa: C901
     title: str = "AioHTTP",
     description: Optional[str] = None,
     version: str = "1.0.0",
+    extra_openapi: Optional[Dict[str, Any]] = None,
 ) -> Callable[[web.Application], Awaitable[None]]:
     """
     Add swagger documentation.
@@ -230,8 +243,11 @@ def setup_swagger(  # noqa: C901
     :param title: Title of an application.
     :param description: description of an application.
     :param version: version of an application.
+    :param extra_openapi: extra openAPI dict that will be merged with generated schema.
     :return: startup event handler.
     """
+    if extra_openapi is None:
+        extra_openapi = {}
 
     async def event_handler(app: web.Application) -> None:  # noqa: C901
         openapi_schema = {
@@ -252,12 +268,12 @@ async def event_handler(app: web.Application) -> None:  # noqa: C901
             if hide_options and route.method.upper() == "OPTIONS":
                 continue
             if isinstance(route._handler, InjectableFuncHandler):
-                extra_openapi = getattr(
+                route_extra_openapi = getattr(
                     route._handler.original_handler,
                     "__extra_openapi__",
                     {},
                 )
-                extra_schemas = getattr(
+                route_extra_schemas = getattr(
                     route._handler.original_handler,
                     "__extra_openapi_schemas__",
                     {},
@@ -268,8 +284,8 @@ async def event_handler(app: web.Application) -> None:  # noqa: C901
                         route,  # type: ignore
                         route.method,
                         route._handler.graph,
-                        extra_openapi=extra_openapi,
-                        extra_openapi_schemas=extra_schemas,
+                        extra_openapi=route_extra_openapi,
+                        extra_openapi_schemas=route_extra_schemas,
                     )
                 except Exception as exc:  # pragma: no cover
                     logger.warn(
@@ -280,12 +296,12 @@ async def event_handler(app: web.Application) -> None:  # noqa: C901
 
             elif isinstance(route._handler, InjectableViewHandler):
                 for key, graph in route._handler.graph_map.items():
-                    extra_openapi = getattr(
+                    route_extra_openapi = getattr(
                         getattr(route._handler.original_handler, key),
                         "__extra_openapi__",
                         {},
                     )
-                    extra_schemas = getattr(
+                    route_extra_schemas = getattr(
                         getattr(route._handler.original_handler, key),
                         "__extra_openapi_schemas__",
                         {},
@@ -296,8 +312,8 @@ async def event_handler(app: web.Application) -> None:  # noqa: C901
                             route,  # type: ignore
                             key,
                             graph,
-                            extra_openapi=extra_openapi,
-                            extra_openapi_schemas=extra_schemas,
+                            extra_openapi=route_extra_openapi,
+                            extra_openapi_schemas=route_extra_schemas,
                         )
                     except Exception as exc:  # pragma: no cover
                         logger.warn(
@@ -306,7 +322,7 @@ async def event_handler(app: web.Application) -> None:  # noqa: C901
                             exc_info=True,
                         )
 
-        app[SWAGGER_SCHEMA_KEY] = openapi_schema
+        app[SWAGGER_SCHEMA_KEY] = always_merger.merge(openapi_schema, extra_openapi)
 
         app.router.add_get(
             schema_url,

aiohttp_deps/utils.py

@@ -1,6 +1,6 @@
 import inspect
 import json
-from typing import Any, Optional, Union
+from typing import Any, Callable, Dict, Optional, Union
 
 import pydantic
 from aiohttp import web
@@ -344,3 +344,37 @@ def __call__(
                 headers={"Content-Type": "application/json"},
                 text=json.dumps(errors),
             ) from err
+
+
+class ExtraOpenAPI:
+    """
+    Update swagger for the endpoint.
+
+    You can use this dependency to add swagger to an endpoint from
+    a dependency. It's useful when you want to add some extra swagger
+    to the route when some specific dependency is used by it.
+    """
+
+    def __init__(
+        self,
+        extra_openapi: Optional[Dict[str, Any]] = None,
+        swagger_updater: Optional[Callable[[Dict[str, Any]], None]] = None,
+    ) -> None:
+        """
+        Initialize the dependency.
+
+        :param swagger_updater: function that takes final swagger endpoint and
+        updates it.
+        :param extra_swagger: extra swagger to add to the endpoint. This one might
+        override other extra_swagger on the endpoint.
+        """
+        self.updater = swagger_updater
+        self.extra_openapi = extra_openapi
+
+    def __call__(self) -> None:
+        """
+        This method is called when dependency is resolved.
+
+        It's empty, becuase it's used by the swagger function and
+        there is no actual dependency.
+        """

examples/swagger_auth.py

@@ -0,0 +1,87 @@
+import base64
+
+from aiohttp import web
+from pydantic import BaseModel
+
+from aiohttp_deps import Depends, ExtraOpenAPI, Header, Router, init, setup_swagger
+
+
+class UserInfo(BaseModel):
+    """Abstract user model."""
+
+    id: int
+    name: str
+    password: str
+
+
+router = Router()
+
+# Here we create a simple user storage.
+# In real-world applications, you would use a database.
+users = {
+    "john": UserInfo(id=1, name="John Doe", password="123"),  # noqa: S106
+    "caren": UserInfo(id=2, name="Caren Doe", password="321"),  # noqa: S106
+}
+
+
+def get_current_user(
+    # Current auth header.
+    authorization: str = Depends(Header()),
+    # We don't need a name to this variable,
+    # because it will only affect the API schema,
+    # but won't be used in runtime.
+    _: None = Depends(
+        ExtraOpenAPI(
+            extra_openapi={
+                "security": [{"basicAuth": []}],
+            },
+        ),
+    ),
+) -> UserInfo:
+    """This function checks if the user authorized."""
+    # Here we check if the authorization header is present.
+    if not authorization.startswith("Basic"):
+        raise web.HTTPUnauthorized(reason="Unsupported authorization type")
+    # We decode credentials from the header.
+    # And check if the user exists.
+    creds = base64.b64decode(authorization.split(" ")[1]).decode()
+    username, password = creds.split(":")
+    found_user = users.get(username)
+    if found_user is None:
+        raise web.HTTPUnauthorized(reason="User not found")
+    if found_user.password != password:
+        raise web.HTTPUnauthorized(reason="Invalid password")
+    return found_user
+
+
+@router.get("/")
+async def index(current_user: UserInfo = Depends(get_current_user)) -> web.Response:
+    """Index handler returns current user."""
+    return web.json_response(current_user.model_dump(mode="json"))
+
+
+app = web.Application()
+app.router.add_routes(router)
+app.on_startup.extend(
+    [
+        init,
+        setup_swagger(
+            # Here we add security schemes used
+            # to authorize users.
+            extra_openapi={
+                "components": {
+                    "securitySchemes": {
+                        # We only support basic auth.
+                        "basicAuth": {
+                            "type": "http",
+                            "scheme": "basic",
+                        },
+                    },
+                },
+            },
+        ),
+    ],
+)
+
+if __name__ == "__main__":
+    web.run_app(app)

tests/test_swagger.py

@@ -8,6 +8,7 @@
 
 from aiohttp_deps import (
     Depends,
+    ExtraOpenAPI,
     Form,
     Header,
     Json,
@@ -780,3 +781,60 @@ async def my_handler() -> None:
     schema = await response.json()
     assert "get" in schema["paths"]["/"]
     assert method.lower() not in schema["paths"]["/"]
+
+
+@pytest.mark.anyio
+async def test_extra_openapi_dep_func(
+    my_app: web.Application,
+    aiohttp_client: ClientGenerator,
+) -> None:
+    openapi_url = "/my_api_def.json"
+    my_app.on_startup.append(setup_swagger(schema_url=openapi_url))
+
+    async def dep(
+        _: None = Depends(ExtraOpenAPI(extra_openapi={"responses": {"200": {}}})),
+    ) -> None:
+        """Test dep that adds swagger through a dependency."""
+
+    async def my_handler(_: None = Depends(dep)) -> None:
+        """Nothing."""
+
+    my_app.router.add_get("/a", my_handler)
+
+    client = await aiohttp_client(my_app)
+    resp = await client.get(openapi_url)
+    assert resp.status == 200
+    resp_json = await resp.json()
+
+    handler_info = resp_json["paths"]["/a"]["get"]
+    assert handler_info["responses"] == {"200": {}}
+
+
+@pytest.mark.anyio
+async def test_extra_openapi_dep_updater_func(
+    my_app: web.Application,
+    aiohttp_client: ClientGenerator,
+) -> None:
+    openapi_url = "/my_api_def.json"
+    my_app.on_startup.append(setup_swagger(schema_url=openapi_url))
+
+    def schema_updater(schema: Dict[str, Any]) -> None:
+        schema["responses"] = {"200": {}}
+
+    async def dep(
+        _: None = Depends(ExtraOpenAPI(swagger_updater=schema_updater)),
+    ) -> None:
+        """Test dep that adds swagger through a dependency."""
+
+    async def my_handler(_: None = Depends(dep)) -> None:
+        """Nothing."""
+
+    my_app.router.add_get("/a", my_handler)
+
+    client = await aiohttp_client(my_app)
+    resp = await client.get(openapi_url)
+    assert resp.status == 200
+    resp_json = await resp.json()
+
+    handler_info = resp_json["paths"]["/a"]["get"]
+    assert handler_info["responses"] == {"200": {}}