text: # Licensed to the Software Freedom Conservancy (SFC) under one
  # or more contributor license agreements.  See the NOTICE file
  # distributed with this work for additional information
  # regarding copyright ownership.  The SFC licenses this file
  # to you under the Apache License, Version 2.0 (the
  # "License"); you may not use this file except in compliance
  # with the License.  You may obtain a copy of the License at
  #
  #   http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing,
  # software distributed under the License is distributed on an
  # "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
  # KIND, either express or implied.  See the License for the
  # specific language governing permissions and limitations
  # under the License.
  
  import logging
  import time
  
  from selenium.webdriver.common.desired_capabilities import DesiredCapabilities
  from selenium.webdriver.common import utils
  from selenium.webdriver.remote.command import Command
  from selenium.webdriver.remote.remote_connection import RemoteConnection
  from selenium.webdriver.firefox.firefox_binary import FirefoxBinary
  
  LOGGER = logging.getLogger(__name__)
  PORT = 0
  HOST = None
  _URL = ""
  
  
  class ExtensionConnection(RemoteConnection):
      def __init__(self, host, firefox_profile, firefox_binary=None, timeout=30):
          self.profile = firefox_profile
          self.binary = firefox_binary
          HOST = host
          timeout = int(timeout)
  
          if self.binary is None:
              self.binary = FirefoxBinary()
  
          if HOST is None:
              HOST = "127.0.0.1"
  
          PORT = utils.free_port()
          self.profile.port = PORT
          self.profile.update_preferences()
  
          self.profile.add_extension()
  
          self.binary.launch_browser(self.profile, timeout=timeout)
          _URL = "http://%s:%d/hub" % (HOST, PORT)
          RemoteConnection.__init__(
              self, _URL, keep_alive=True)
  
      def quit(self, sessionId=None):
          self.execute(Command.QUIT, {'sessionId': sessionId})
          while self.is_connectable():
              LOGGER.info("waiting to quit")
              time.sleep(1)
  
      def connect(self):
          """Connects to the extension and retrieves the session id."""
          return self.execute(Command.NEW_SESSION,
                              {'desiredCapabilities': DesiredCapabilities.FIREFOX})
  
      @classmethod
      def connect_and_quit(self):
          """Connects to an running browser and quit immediately."""
          self._request('%s/extensions/firefox/quit' % _URL)
  
      @classmethod
      def is_connectable(self):
          """Tries to connect to the extension but do not retrieve context."""
          utils.is_connectable(self.profile.port)
  
  
  class ExtensionConnectionError(Exception):
      """An internal error occurred int the extension.
  
      Might be caused by bad input or bugs in webdriver
      """
      pass
  