''' Checks if the user provided an API token with its request and if

      this token allows the user to access the endpoint desired.

      '''

      flask.g.token = None

      token = None

      token_str = None

      if 'Authorization' in flask.request.headers:

          authorization = flask.request.headers['Authorization']

          if 'token' in authorization:

  @API.route('/version/')

  @API.route('/version')

  def api_version():

      '''

      API Version

      ::

      Sample response

      ^^^^^^^^^^^^^^^

  @API.route('/error_codes/')

  @API.route('/error_codes')

  def api_error_codes():

      '''

      Error codes

      ::

      Sample response

      ^^^^^^^^^^^^^^^

  from pagure.api import (API, api_method, api_login_required, APIERROR,

                          get_authorized_api_project, get_request_data)

  from pagure.config import config as pagure_config

  _log = logging.getLogger(__name__)

          raise pagure.exceptions.APIError(

              404, error_code=APIERROR.EPULLREQUESTSDISABLED)

              and repo != flask.g.token.project:

          raise pagure.exceptions.APIError(

              401, error_code=APIERROR.EINVALIDTOK)

                                              content_type='application/json'):

              self.assertEqual(pagure.api.get_request_data()['foo'], 'bar')

          """ Test the api_version function.  """

          output = self.app.get('/api/0/version')

          self.assertEqual(output.status_code, 200)

          data = json.loads(output.get_data(as_text=True))

          self.assertEqual(data['version'], pagure.__api_version__)

          self.assertEqual(sorted(data.keys()), ['version'])

      def test_api_project_tags(self):

          """ Test the api_project_tags function.  """

          tests.create_projects(self.session)

          # Valid token, wrong project

          output = self.app.post(

              '/api/0/test2/pull-request/1/subscribe', headers=headers)

          data = json.loads(output.get_data(as_text=True))

                           data['error_code'])

          # No input

          output = self.app.post(