human
Solve the following python programming problem given the following code:
def make_authorization_endpoint(missing_redirect_uri, authorization_endpoint_uri, authorization_template_name) : 
    ' Returns a endpoint that handles OAuth authorization requests.

  The template described by ``authorization_template_name`` is rendered with a
  Django ``RequestContext`` with the following variables:

  * ``form``: a Django ``Form`` that may hold data internal to the ``djoauth2``
    application.
  * ``client``: The :py:class:`djoauth2.models.Client` requesting access to the
    user\'s scopes.
  * ``scopes``: A list of :py:class:`djoauth2.models.Scope`, one for each of
    the scopes requested by the client.
  * ``form_action``: The URI to which the form should be submitted -- use this
    value in the ``action=""`` attribute on a ``<form>`` element.

  :param missing_redirect_uri: a string, the URI to which to redirect the user
      when the request is made by a client without a valid redirect URI.

  :param authorization_endpoint_uri: a string, the URI of this endpoint. Used
      by the authorization form so that the form is submitted to this same
      endpoint.

  :param authorization_template_name: a string, the name of the template to
      render when handling authorization requests.

  :rtype: A view function endpoint.
  ' 
    @ login_required 
    @ require_http_methods (['GET', 'POST']) 
    def authorization_endpoint(request) : 
        auth_code_generator = AuthorizationCodeGenerator (missing_redirect_uri) 
        try : 
            auth_code_generator.validate (request) 
except AuthorizationError as authorization_error : 
            return auth_code_generator.make_error_redirect (authorization_error) 
if (request.method == 'GET') : 
            return render (request, authorization_template_name, { 
                'form' : Form (), 
                'client' : auth_code_generator.client, 
                'scopes' : auth_code_generator.valid_scope_objects, 
                'form_action' : update_parameters (authorization_endpoint_uri,...
    
    Given the code above, what is a proper replacement for <MASK>?
assistant
#Here is a proper replacement for <MASK>.
def authorization_endpoint(