# Source code for flask_dance.contrib.dropbox

    from flask import g
    from werkzeug.local import LocalProxy

    from flask_dance.consumer import OAuth2ConsumerBlueprint

    __maintainer__ = "David Baumgold <david@davidbaumgold.com>"

    def make_dropbox_blueprint(
        app_key=None,
        app_secret=None,
        *,
        scope=None,
        offline=False,
        force_reapprove=False,
        disable_signup=False,
        require_role=None,
        redirect_url=None,
        redirect_to=None,
        login_url=None,
        authorized_url=None,
        session_class=None,
        storage=None,
        rule_kwargs=None,
    ):
        """
        Make a blueprint for authenticating with Dropbox using OAuth 2. This requires
        a client ID and client secret from Dropbox. You should either pass them to
        this constructor, or make sure that your Flask application config defines
        them, using the variables :envvar:`DROPBOX_OAUTH_CLIENT_ID` and
        :envvar:`DROPBOX_OAUTH_CLIENT_SECRET`.

        For more information about the ``force_reapprove``, ``disable_signup``,
        and ``require_role`` arguments, `check the Dropbox API documentation
        <https://www.dropbox.com/developers/documentation/http/overview>`_.

        Args:
            app_key (str): The client ID for your application on Dropbox.
            app_secret (str): The client secret for your application on Dropbox
            scope (str, optional): Comma-separated list of scopes for the OAuth token
            offline (bool): Whether to request `Dropbox offline access
                <https://www.dropbox.com/lp/developers/reference/oauth-guide>`_
                for the OAuth token. Defaults to False
            force_reapprove (bool): Force the user to approve the app again
                if they've already done so.
            disable_signup (bool): Prevent users from seeing a sign-up link
                on the authorization page.
            require_role (str): Pass the string ``work`` to require a Dropbox
                for Business account, or the string ``personal`` to require a
                personal account.
            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 ``/dropbox``
            authorized_url (str, optional): the URL path for the ``authorized`` view.
                Defaults to ``/dropbox/authorized``.
            session_class (class, optional): The class to use for creating a
                Requests session. Defaults to
                :class:`~flask_dance.consumer.requests.OAuth2Session`.
            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`.
            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 offline:
            authorization_url_params["token_access_type"] = "offline"
        if force_reapprove:
            authorization_url_params["force_reapprove"] = "true"
        if disable_signup:
            authorization_url_params["disable_signup"] = "true"
        if require_role:
            authorization_url_params["require_role"] = require_role

        dropbox_bp = OAuth2ConsumerBlueprint(
            "dropbox",
            __name__,
            client_id=app_key,
            client_secret=app_secret,
            scope=scope,
            base_url="https://api.dropbox.com/2/",
            authorization_url="https://www.dropbox.com/oauth2/authorize",
            token_url="https://api.dropbox.com/oauth2/token",
            redirect_url=redirect_url,
            redirect_to=redirect_to,
            login_url=login_url,
            authorized_url=authorized_url,
            authorization_url_params=authorization_url_params,
            session_class=session_class,
            storage=storage,
            rule_kwargs=rule_kwargs,
        )
        dropbox_bp.from_config["client_id"] = "DROPBOX_OAUTH_CLIENT_ID"
        dropbox_bp.from_config["client_secret"] = "DROPBOX_OAUTH_CLIENT_SECRET"

        @dropbox_bp.before_app_request
        def set_applocal_session():
            g.flask_dance_dropbox = dropbox_bp.session

        return dropbox_bp

    dropbox = LocalProxy(lambda: g.flask_dance_dropbox)