# Source code for flask_dance.contrib.reddit

    from flask import g
    from werkzeug.local import LocalProxy

    from flask_dance import __version__ as _flask_dance_version
    from flask_dance.consumer import OAuth2ConsumerBlueprint, OAuth2Session

    __maintainer__ = "Sergey Storchay <r8@r8.com.ua>"

    DEFAULT_USER_AGENT = f"Flask-Dance/{_flask_dance_version}"

    class RedditOAuth2Session(OAuth2Session):
        def __init__(self, *args, **kwargs):
            super().__init__(*args, **kwargs)

            # The Reddit API requires a non-generic user agent
            self.headers["User-Agent"] = self.blueprint.user_agent or DEFAULT_USER_AGENT

        def fetch_token(self, *args, **kwargs):
            # Pass client_id to session so it could trigger Basic Auth
            return super().fetch_token(client_id=self.blueprint.client_id, *args, **kwargs)

    def make_reddit_blueprint(
        client_id=None,
        client_secret=None,
        *,
        scope="identity",
        permanent=False,
        redirect_url=None,
        redirect_to=None,
        login_url=None,
        authorized_url=None,
        session_class=None,
        storage=None,
        user_agent=None,
        rule_kwargs=None,
    ):
        """
        Make a blueprint for authenticating with Reddit using OAuth 2. This requires
        a client ID and client secret from Reddit. You should either pass them to
        this constructor, or make sure that your Flask application config defines
        them, using the variables :envvar:`REDDIT_OAUTH_CLIENT_ID` and
        :envvar:`REDDIT_OAUTH_CLIENT_SECRET`.

        Args:
            client_id (str): The client ID for your application on Reddit.
            client_secret (str): The client secret for your application on Reddit
            scope (str, optional): space-separated list of scopes for the OAuth token
                Defaults to ``identity``
            permanent (bool, optional): Whether to request permanent access token.
                Defaults to False, access will be valid for 1 hour
            redirect_url (str): the URL to redirect to after the authentication
                dance is complete
            redirect_to (str): if ``redirect_url`` is not defined, the name of the
                view to redirect to after the authentication dance is complete.
                The actual URL will be determined by :func:`flask.url_for`
            login_url (str, optional): the URL path for the ``login`` view.
                Defaults to ``/reddit``
            authorized_url (str, optional): the URL path for the ``authorized`` view.
                Defaults to ``/reddit/authorized``.
            session_class (class, optional): The class to use for creating a
                Requests session. Defaults to
                :class:`~flask_dance.contrib.reddit.RedditOAuth2Session`.
            storage: A token storage class, or an instance of a token storage
                class, to use for this blueprint. Defaults to
                :class:`~flask_dance.consumer.storage.session.SessionStorage`.
            user_agent (str, optional): User agent for the requests to Reddit API.
                Defaults to ``Flask-Dance/{{version}}``.
            rule_kwargs (dict, optional): Additional arguments that should be passed when adding
                the login and authorized routes. Defaults to ``None``.

        :rtype: :class:`~flask_dance.consumer.OAuth2ConsumerBlueprint`
        :returns: A :doc:`blueprint <flask:blueprints>` to attach to your Flask app.
        """
        authorization_url_params = {}
        if permanent:
            authorization_url_params["duration"] = "permanent"

        reddit_bp = OAuth2ConsumerBlueprint(
            "reddit",
            __name__,
            client_id=client_id,
            client_secret=client_secret,
            scope=scope,
            base_url="https://oauth.reddit.com/",
            authorization_url="https://www.reddit.com/api/v1/authorize",
            authorization_url_params=authorization_url_params,
            token_url="https://www.reddit.com/api/v1/access_token",
            auto_refresh_url="https://www.reddit.com/api/v1/access_token",
            redirect_url=redirect_url,
            redirect_to=redirect_to,
            login_url=login_url,
            authorized_url=authorized_url,
            session_class=session_class or RedditOAuth2Session,
            storage=storage,
            rule_kwargs=rule_kwargs,
        )

        reddit_bp.from_config["client_id"] = "REDDIT_OAUTH_CLIENT_ID"
        reddit_bp.from_config["client_secret"] = "REDDIT_OAUTH_CLIENT_SECRET"

        reddit_bp.user_agent = user_agent

        @reddit_bp.before_app_request
        def set_applocal_session():
            g.flask_dance_reddit = reddit_bp.session

        return reddit_bp

    reddit = LocalProxy(lambda: g.flask_dance_reddit)