auth next part

api/application/usecase/auth/auth_user.py

@@ -0,0 +1,30 @@
+from api.application.contracts.auth.auth_request import LoginRequest
+from api.application.contracts.auth.auth_response import AuthenticationResponse
+from api.application.protocols.password_hasher import PasswordHasher
+from api.domain.user.error import UserInvalidCredentialsError
+from api.domain.user.repository import UserRepository
+
+
+class LoginUser:
+    def __init__(
+        self,
+        user_repository: UserRepository,
+        password_hasher: PasswordHasher,
+    ) -> None:
+        self.user_repository = user_repository
+        self.hasher = password_hasher
+
+    async def __call__(self, request: LoginRequest) -> AuthenticationResponse:
+        user = await self.user_repository.get_user(filter={"email": request.email})
+        error = UserInvalidCredentialsError("Email or password is incorrect")
+        if user is None:
+            raise error
+
+        if not self.hasher.verify_password(request.password, user.hashed_password):
+            raise error
+
+        return AuthenticationResponse(
+            id=user.id.value,
+            name=user.name.value,
+            email=user.email.value,
+        )