text: # Copyright (c) Jupyter Development Team.
  # Distributed under the terms of the Modified BSD License.
  
  import errno
  import os
  import stat
  import subprocess
  from jupyter_core.paths import jupyter_data_dir
  
  c = get_config()
  c.NotebookApp.ip = '*'
  c.NotebookApp.port = 8888
  c.NotebookApp.open_browser = False
  
  # Generate a self-signed certificate
  if 'GEN_CERT' in os.environ:
    dir_name = jupyter_data_dir()
    pem_file = os.path.join(dir_name, 'notebook.pem')
    try:
      os.makedirs(dir_name)
    except OSError as exc:  # Python >2.5
      if exc.errno == errno.EEXIST and os.path.isdir(dir_name):
        pass
      else:
        raise
    # Generate a certificate if one doesn't exist on disk
    subprocess.check_call(['openssl', 'req', '-new',
                           '-newkey', 'rsa:2048',
                           '-days', '365',
                           '-nodes', '-x509',
                           '-subj', '/C=XX/ST=XX/L=XX/O=generated/CN=generated',
                           '-keyout', pem_file,
                           '-out', pem_file])
    # Restrict access to the file
    os.chmod(pem_file, stat.S_IRUSR | stat.S_IWUSR)
    c.NotebookApp.certfile = pem_file
  