Improve type hints (#1401)

* Add type parameters to `AuthenticationBackend`

* add more type-hints

fastapi_users/authentication/authenticator.py

@@ -1,6 +1,6 @@
 import re
 from inspect import Parameter, Signature
-from typing import Callable, List, Optional, Sequence, Tuple, cast
+from typing import Any, Callable, Generic, List, Optional, Sequence, Tuple, cast
 
 from fastapi import Depends, HTTPException, status
 from makefun import with_signature
@@ -31,10 +31,10 @@ class DuplicateBackendNamesError(Exception):
     pass
 
 
-EnabledBackendsDependency = DependencyCallable[Sequence[AuthenticationBackend]]
+EnabledBackendsDependency = DependencyCallable[Sequence[AuthenticationBackend[models.UP, models.ID]]]
 
 
-class Authenticator:
+class Authenticator(Generic[models.UP, models.ID]):
     """
     Provides dependency callables to retrieve authenticated user.
 
@@ -46,11 +46,11 @@ class Authenticator:
     :param get_user_manager: User manager dependency callable.
     """
 
-    backends: Sequence[AuthenticationBackend]
+    backends: Sequence[AuthenticationBackend[models.UP, models.ID]]
 
     def __init__(
         self,
-        backends: Sequence[AuthenticationBackend],
+        backends: Sequence[AuthenticationBackend[models.UP, models.ID]],
         get_user_manager: UserManagerDependency[models.UP, models.ID],
     ):
         self.backends = backends
@@ -62,7 +62,7 @@ class Authenticator:
         active: bool = False,
         verified: bool = False,
         superuser: bool = False,
-        get_enabled_backends: Optional[EnabledBackendsDependency] = None,
+        get_enabled_backends: Optional[EnabledBackendsDependency[models.UP, models.ID]] = None,
     ):
         """
         Return a dependency callable to retrieve currently authenticated user and token.
@@ -88,7 +88,7 @@ class Authenticator:
         signature = self._get_dependency_signature(get_enabled_backends)
 
         @with_signature(signature)
-        async def current_user_token_dependency(*args, **kwargs):
+        async def current_user_token_dependency(*args: Any, **kwargs: Any):
             return await self._authenticate(
                 *args,
                 optional=optional,
@@ -106,7 +106,7 @@ class Authenticator:
         active: bool = False,
         verified: bool = False,
         superuser: bool = False,
-        get_enabled_backends: Optional[EnabledBackendsDependency] = None,
+        get_enabled_backends: Optional[EnabledBackendsDependency[models.UP, models.ID]] = None,
     ):
         """
         Return a dependency callable to retrieve currently authenticated user.
@@ -132,7 +132,7 @@ class Authenticator:
         signature = self._get_dependency_signature(get_enabled_backends)
 
         @with_signature(signature)
-        async def current_user_dependency(*args, **kwargs):
+        async def current_user_dependency(*args: Any, **kwargs: Any):
             user, _ = await self._authenticate(
                 *args,
                 optional=optional,
@@ -157,7 +157,7 @@ class Authenticator:
     ) -> Tuple[Optional[models.UP], Optional[str]]:
         user: Optional[models.UP] = None
         token: Optional[str] = None
-        enabled_backends: Sequence[AuthenticationBackend] = kwargs.get(
+        enabled_backends: Sequence[AuthenticationBackend[models.UP, models.ID]] = kwargs.get(
             "enabled_backends", self.backends
         )
         for backend in self.backends:

fastapi_users/fastapi_users.py

@@ -35,12 +35,12 @@ class FastAPIUsers(Generic[models.UP, models.ID]):
     with a specific set of parameters.
     """
 
-    authenticator: Authenticator
+    authenticator: Authenticator[models.UP, models.ID]
 
     def __init__(
         self,
         get_user_manager: UserManagerDependency[models.UP, models.ID],
-        auth_backends: Sequence[AuthenticationBackend],
+        auth_backends: Sequence[AuthenticationBackend[models.UP, models.ID]],
     ):
         self.authenticator = Authenticator(auth_backends, get_user_manager)
         self.get_user_manager = get_user_manager
@@ -72,7 +72,7 @@ class FastAPIUsers(Generic[models.UP, models.ID]):
         return get_reset_password_router(self.get_user_manager)
 
     def get_auth_router(
-        self, backend: AuthenticationBackend, requires_verification: bool = False
+        self, backend: AuthenticationBackend[models.UP, models.ID], requires_verification: bool = False
     ) -> APIRouter:
         """
         Return an auth router for a given authentication backend.
@@ -91,7 +91,7 @@ class FastAPIUsers(Generic[models.UP, models.ID]):
     def get_oauth_router(
         self,
         oauth_client: BaseOAuth2,
-        backend: AuthenticationBackend,
+        backend: AuthenticationBackend[models.UP, models.ID],
         state_secret: SecretType,
         redirect_url: Optional[str] = None,
         associate_by_email: bool = False,

fastapi_users/router/auth.py

@@ -11,9 +11,9 @@ from fastapi_users.router.common import ErrorCode, ErrorModel
 
 
 def get_auth_router(
-    backend: AuthenticationBackend,
+    backend: AuthenticationBackend[models.UP, models.ID],
     get_user_manager: UserManagerDependency[models.UP, models.ID],
-    authenticator: Authenticator,
+    authenticator: Authenticator[models.UP, models.ID],
     requires_verification: bool = False,
 ) -> APIRouter:
     """Generate a router with login/logout routes for an authentication backend."""

fastapi_users/router/oauth.py

@@ -29,7 +29,7 @@ def generate_state_token(
 
 def get_oauth_router(
     oauth_client: BaseOAuth2,
-    backend: AuthenticationBackend,
+    backend: AuthenticationBackend[models.UP, models.ID],
     get_user_manager: UserManagerDependency[models.UP, models.ID],
     state_secret: SecretType,
     redirect_url: Optional[str] = None,
@@ -156,7 +156,7 @@ def get_oauth_router(
 
 def get_oauth_associate_router(
     oauth_client: BaseOAuth2,
-    authenticator: Authenticator,
+    authenticator: Authenticator[models.UP, models.ID],
     get_user_manager: UserManagerDependency[models.UP, models.ID],
     user_schema: Type[schemas.U],
     state_secret: SecretType,

fastapi_users/router/users.py

@@ -12,7 +12,7 @@ def get_users_router(
     get_user_manager: UserManagerDependency[models.UP, models.ID],
     user_schema: Type[schemas.U],
     user_update_schema: Type[schemas.UU],
-    authenticator: Authenticator,
+    authenticator: Authenticator[models.UP, models.ID],
     requires_verification: bool = False,
 ) -> APIRouter:
     """Generate a router with the authentication routes."""