feat: httpx.AsyncClient factory method to customize client

Argument `get_httpx_client` incorporated to `SSOBase` to allow
customization of `httpx.AsyncClient` used to call auth provider

examples/seznam.py

@@ -31,7 +31,9 @@ async def auth_init():
 async def auth_callback(request: Request):
     """Verify login"""
     with sso:
-        user = await sso.verify_and_process(request, params={"client_secret": CLIENT_SECRET})  # <- "client_secret" parameter is needed!
+        user = await sso.verify_and_process(
+            request, params={"client_secret": CLIENT_SECRET}
+        )  # <- "client_secret" parameter is needed!
     return user
 
 

fastapi_sso/sso/base.py

@@ -7,7 +7,7 @@
 import sys
 import warnings
 from types import TracebackType
-from typing import Any, ClassVar, Dict, List, Literal, Optional, Type, TypedDict, TypeVar, Union, overload
+from typing import Any, Callable, ClassVar, Dict, List, Literal, Optional, Type, TypedDict, TypeVar, Union, overload
 
 import httpx
 import pydantic
@@ -110,12 +110,14 @@ def __init__(
         allow_insecure_http: bool = False,
         use_state: bool = False,
         scope: Optional[List[str]] = None,
+        get_async_client: Optional[Callable[[], httpx.AsyncClient]] = None,
     ):
         """Base class (mixin) for all SSO providers."""
         self.client_id: str = client_id
         self.client_secret: str = client_secret
         self.redirect_uri: Optional[Union[pydantic.AnyHttpUrl, str]] = redirect_uri
         self.allow_insecure_http: bool = allow_insecure_http
+        self.get_async_client: Callable[[], httpx.AsyncClient] = get_async_client or httpx.AsyncClient
         self._login_lock = asyncio.Lock()
         self._in_stack = False
         self._oauth_client: Optional[WebApplicationClient] = None
@@ -330,10 +332,10 @@ async def verify_and_process(
         self,
         request: Request,
         *,
-        params: Optional[Dict[str, Any]] = None,
-        headers: Optional[Dict[str, Any]] = None,
-        redirect_uri: Optional[str] = None,
-        convert_response: Literal[True] = True,
+        params: Optional[Dict[str, Any]],
+        headers: Optional[Dict[str, Any]],
+        redirect_uri: Optional[str],
+        convert_response: Literal[True],
     ) -> Optional[OpenID]: ...
 
     @overload
@@ -458,11 +460,11 @@ async def process_login(
         code: str,
         request: Request,
         *,
-        params: Optional[Dict[str, Any]] = None,
-        additional_headers: Optional[Dict[str, Any]] = None,
-        redirect_uri: Optional[str] = None,
-        pkce_code_verifier: Optional[str] = None,
-        convert_response: Literal[True] = True,
+        params: Optional[Dict[str, Any]],
+        additional_headers: Optional[Dict[str, Any]],
+        redirect_uri: Optional[str],
+        pkce_code_verifier: Optional[str],
+        convert_response: Literal[True],
     ) -> Optional[OpenID]: ...
 
     @overload
@@ -471,10 +473,10 @@ async def process_login(
         code: str,
         request: Request,
         *,
-        params: Optional[Dict[str, Any]] = None,
-        additional_headers: Optional[Dict[str, Any]] = None,
-        redirect_uri: Optional[str] = None,
-        pkce_code_verifier: Optional[str] = None,
+        params: Optional[Dict[str, Any]],
+        additional_headers: Optional[Dict[str, Any]],
+        redirect_uri: Optional[str],
+        pkce_code_verifier: Optional[str],
         convert_response: Literal[False],
     ) -> Optional[Dict[str, Any]]: ...
 
@@ -552,7 +554,7 @@ async def process_login(
 
         auth = httpx.BasicAuth(self.client_id, self.client_secret)
 
-        async with httpx.AsyncClient() as session:
+        async with self.get_async_client() as session:
             response = await session.post(token_url, headers=headers, content=body, auth=auth)
             content = response.json()
             self._refresh_token = content.get("refresh_token")

tests/test_providers.py

@@ -151,8 +151,8 @@ async def test_process_login(self, Provider: Type[SSOBase], monkeypatch: pytest.
         async def fake_openid_from_response(_, __):
             return OpenID(id="test", email="[email protected]", display_name="Test")
 
-        async with sso:
-            monkeypatch.setattr("httpx.AsyncClient", FakeAsyncClient)
+        with sso:
+            monkeypatch.setattr(sso, "get_async_client", FakeAsyncClient)
             monkeypatch.setattr(sso, "openid_from_response", fake_openid_from_response)
             request = Request(url="https://localhost?code=code&state=unique")
             await sso.process_login("code", request)

tests/test_race_condition.py

@@ -54,29 +54,26 @@ async def get(self, *args, **kwargs):
             await asyncio.sleep(0)
             return Response(token="")
 
-    with patch("fastapi_sso.sso.base.httpx") as httpx:
-        httpx.AsyncClient = AsyncClient
-
-        first_response = Response(token="first_token")  # noqa: S106
-        second_response = Response(token="second_token")  # noqa: S106
-
-        AsyncClient.post_responses = [second_response, first_response]  # reversed order because of `pop`
-
-        async def process_login():
-            # this coro will be executed concurrently.
-            # completely not caring about the params
-            request = Mock()
-            request.url = URL("https://url.com?state=state&code=code")
-            async with provider:
-                await provider.process_login(
-                    code="code", request=request, params=dict(state="state"), convert_response=False
-                )
-                return provider.access_token
-
-        # process login concurrently twice
-        tasks = [process_login(), process_login()]
-        results = await asyncio.gather(*tasks)
-
-        # we would want to get the first and second tokens,
-        # but we see that the first request actually obtained the second token as well
-        assert results == [first_response.token, second_response.token]
+    first_response = Response(token="first_token")  # noqa: S106
+    second_response = Response(token="second_token")  # noqa: S106
+    AsyncClient.post_responses = [second_response, first_response]  # reversed order because of `pop`
+    provider.get_async_client = AsyncClient
+
+    async def process_login():
+        # this coro will be executed concurrently.
+        # completely not caring about the params
+        request = Mock()
+        request.url = URL("https://url.com?state=state&code=code")
+        async with provider:
+            await provider.process_login(
+                code="code", request=request, params=dict(state="state"), convert_response=False
+            )
+            return provider.access_token
+
+    # process login concurrently twice
+    tasks = [process_login(), process_login()]
+    results = await asyncio.gather(*tasks)
+
+    # we would want to get the first and second tokens,
+    # but we see that the first request actually obtained the second token as well
+    assert results == [first_response.token, second_response.token]