docs: def login():
      '''Log in as administrator
  
      You can use wither basic auth or form based login (via POST).
  
      :param username: The administrator's username
      :type username: string
      :param password: The administrator's password
      :type password: string
      '''
      username = None
      password = None
      next = flask.request.args.get('next')
      auth = flask.request.authorization
  
      if flask.request.method == 'POST':
          username = flask.request.form['username']
          password = flask.request.form['password']
  
      if auth and auth.type == 'basic':
          username = auth.username
          password = auth.password
  
      if not flogin.current_user.is_active:
          error = 'You have to login with proper credentials'
          if username and password:
              if check_auth(username, password):
                  user = _users.get(username)
                  if user:
                      if flogin.login_user(user):
                          return flask.redirect(next or flask.url_for("user"))
                      error = 'Could not log in user.'
                  else:
                      error = 'User not found.'
              else:
                  error = 'Wrong username or password.'
          else:
              error = 'No username or password.'
          return flask.Response(
              'Could not verify your access level for that URL.\n {}'.format(error),
              401,
              {str('WWW-Authenticate'): str('Basic realm="Login Required"')})
      return flask.redirect(next or flask.url_for("user"))