text: from __future__ import unicode_literals
  
  from flask_dance.consumer import OAuth2ConsumerBlueprint
  from functools import partial
  from flask.globals import LocalProxy, _lookup_app_object
  try:
      from flask import _app_ctx_stack as stack
  except ImportError:
      from flask import _request_ctx_stack as stack
  
  
  __maintainer__ = "David Baumgold <david@davidbaumgold.com>"
  
  
  def make_github_blueprint(
          client_id=None, client_secret=None, scope=None, redirect_url=None,
          redirect_to=None, login_url=None, authorized_url=None,
          session_class=None, backend=None):
      """
      Make a blueprint for authenticating with GitHub using OAuth 2. This requires
      a client ID and client secret from GitHub. You should either pass them to
      this constructor, or make sure that your Flask application config defines
      them, using the variables GITHUB_OAUTH_CLIENT_ID and GITHUB_OAUTH_CLIENT_SECRET.
  
      Args:
          client_id (str): The client ID for your application on GitHub.
          client_secret (str): The client secret for your application on GitHub
          scope (str, optional): comma-separated list of scopes for the OAuth token
          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 ``/github``
          authorized_url (str, optional): the URL path for the ``authorized`` view.
              Defaults to ``/github/authorized``.
          session_class (class, optional): The class to use for creating a
              Requests session. Defaults to
              :class:`~flask_dance.consumer.requests.OAuth2Session`.
          backend: A storage backend class, or an instance of a storage
                  backend class, to use for this blueprint. Defaults to
                  :class:`~flask_dance.consumer.backend.session.SessionBackend`.
  
      :rtype: :class:`~flask_dance.consumer.OAuth2ConsumerBlueprint`
      :returns: A :ref:`blueprint <flask:blueprints>` to attach to your Flask app.
      """
      github_bp = OAuth2ConsumerBlueprint("github", __name__,
          client_id=client_id,
          client_secret=client_secret,
          scope=scope,
          base_url="https://api.github.com/",
          authorization_url="https://github.com/login/oauth/authorize",
          token_url="https://github.com/login/oauth/access_token",
          redirect_url=redirect_url,
          redirect_to=redirect_to,
          login_url=login_url,
          authorized_url=authorized_url,
          session_class=session_class,
          backend=backend,
      )
      github_bp.from_config["client_id"] = "GITHUB_OAUTH_CLIENT_ID"
      github_bp.from_config["client_secret"] = "GITHUB_OAUTH_CLIENT_SECRET"
  
      @github_bp.before_app_request
      def set_applocal_session():
          ctx = stack.top
          ctx.github_oauth = github_bp.session
  
      return github_bp
  
  github = LocalProxy(partial(_lookup_app_object, "github_oauth"))
  