Method authenticate

django/contrib/auth/backends.py:270–298

The username passed as ``remote_user`` is considered trusted. Return the ``User`` object with the given username. Create a new ``User`` object if ``create_unknown_user`` is ``True``. Return None if ``create_unknown_user`` is ``False`` and a ``User`` object w

(self, request, remote_user)

    create_unknown_user = True

    def authenticate(self, request, remote_user):
        """
        The username passed as ``remote_user`` is considered trusted. Return
        the ``User`` object with the given username. Create a new ``User``
        object if ``create_unknown_user`` is ``True``.

        Return None if ``create_unknown_user`` is ``False`` and a ``User``
        object with the given username is not found in the database.
        """
        if not remote_user:
            return
        created = False
        user = None
        username = self.clean_username(remote_user)

        # Note that this could be accomplished in one try-except clause, but
        # instead we use get_or_create when creating unknown users since it has
        # built-in safeguards for multiple threads.
        if self.create_unknown_user:
            user, created = UserModel._default_manager.get_or_create(
                **{UserModel.USERNAME_FIELD: username}
            )
        else:
            try:
                user = UserModel._default_manager.get_by_natural_key(username)
            except UserModel.DoesNotExist:
                pass
        user = self.configure_user(request, user, created=created)
        return user if self.user_can_authenticate(user) else None

    async def aauthenticate(self, request, remote_user):
        """See authenticate()."""