def secure_filename(filename):
    r"""Borrowed from :mod:`werkzeug.utils`, under the BSD 3-clause license.

    Pass it a filename and it will return a secure version of it.  This
    filename can then safely be stored on a regular file system and passed
    to :func:`os.path.join`.  The filename returned is an ASCII only string
    for maximum portability.

    On windows systems the function also makes sure that the file is not
    named after one of the special device files.

    >>> secure_filename("My cool movie.mov")
    'My_cool_movie.mov'
    >>> secure_filename("../../../etc/passwd")
    'etc_passwd'
    >>> secure_filename(u'i contain cool \xfcml\xe4uts.txt')
    'i_contain_cool_umlauts.txt'

    The function might return an empty filename.  It's your responsibility
    to ensure that the filename is unique and that you generate random
    filename if the function returned an empty one.

    :param filename: the filename to secure
    """
    _filename_ascii_strip_re = re.compile(r'[^A-Za-z0-9_.-]')
    _windows_device_files = ('CON', 'AUX', 'COM1', 'COM2', 'COM3', 'COM4',
                             'LPT1', 'LPT2', 'LPT3', 'PRN', 'NUL')
    if isinstance(filename, text_type):
        from unicodedata import normalize
        filename = normalize('NFKD', filename).encode('ascii', 'ignore')
        if not PY2:
            filename = filename.decode('ascii')
    for sep in os.path.sep, os.path.altsep:
        if sep:
            filename = filename.replace(sep, ' ')
    filename = str(_filename_ascii_strip_re.sub('', '_'.join(
                   filename.split()))).strip('._')

    # on nt a couple of special files are present in each folder.  We
    # have to ensure that the target file is not such a filename.  In
    # this case we prepend an underline
    if os.name == 'nt' and filename and \
       filename.split('.')[0].upper() in _windows_device_files:
        filename = '_' + filename

    return filename
def execute_rpc(self, audit_name, rpc_code, response_queue, args, kwargs):
        """
        Honor a remote procedure call request from a plugin.

        :param audit_name: Name of the audit requesting the call.
        :type audit_name: str

        :param rpc_code: RPC code.
        :type rpc_code: int

        :param response_queue: Response queue identity.
        :type response_queue: str

        :param args: Positional arguments to the call.
        :type args: tuple

        :param kwargs: Keyword arguments to the call.
        :type kwargs: dict
        """
        try:

            # Get the implementor for the RPC code.
            # Raise NotImplementedError if it's not defined.
            try:
                target, blocking = self.__rpcMap[rpc_code]
            except KeyError:
                raise NotImplementedError(
                    "RPC code not implemented: %r" % rpc_code)

            # If it's a blocking call...
            if blocking:

                # Run the implementor in a new thread.
                thread = Thread(
                    target = self._execute_rpc_implementor_background,
                    args = (
                        Config._context,
                        audit_name,
                        target,
                        response_queue,
                        args, kwargs),
                )
                thread.daemon = True
                thread.start()

            # If it's a non-blocking call...
            else:

                # Call the implementor directly.
                self.execute_rpc_implementor(
                    audit_name, target, response_queue, args, kwargs)

        # Catch exceptions and send them back.
        except Exception:
            if response_queue:
                error = self.prepare_exception(*sys.exc_info())
                try:
                    self.orchestrator.messageManager.send(
                        response_queue, (False, error))
                except IOError:
                    import warnings
                    warnings.warn("RPC caller died!")
                    pass