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      1 # Copyright 2012, Google Inc.
      2 # All rights reserved.
      3 #
      4 # Redistribution and use in source and binary forms, with or without
      5 # modification, are permitted provided that the following conditions are
      6 # met:
      7 #
      8 #     * Redistributions of source code must retain the above copyright
      9 # notice, this list of conditions and the following disclaimer.
     10 #     * Redistributions in binary form must reproduce the above
     11 # copyright notice, this list of conditions and the following disclaimer
     12 # in the documentation and/or other materials provided with the
     13 # distribution.
     14 #     * Neither the name of Google Inc. nor the names of its
     15 # contributors may be used to endorse or promote products derived from
     16 # this software without specific prior written permission.
     17 #
     18 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19 # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20 # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21 # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22 # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29 
     30 import struct
     31 
     32 from mod_pywebsocket import common
     33 from mod_pywebsocket import stream
     34 
     35 
     36 def web_socket_do_extra_handshake(request):
     37     pass
     38 
     39 
     40 def web_socket_transfer_data(request):
     41     while True:
     42         line = request.ws_stream.receive_message()
     43         if line is None:
     44             return
     45         code, reason = line.split(' ', 1)
     46         if code is None or reason is None:
     47             return
     48         request.ws_stream.close_connection(int(code), reason)
     49         # close_connection() initiates closing handshake. It validates code
     50         # and reason. If you want to send a broken close frame for a test,
     51         # following code will be useful.
     52         # > data = struct.pack('!H', int(code)) + reason.encode('UTF-8')
     53         # > request.connection.write(stream.create_close_frame(data))
     54         # > # Suppress to re-respond client responding close frame.
     55         # > raise Exception("customized server initiated closing handshake")
     56 
     57 
     58 def web_socket_passive_closing_handshake(request):
     59     # Simply echo a close status code
     60     code, reason = request.ws_close_code, request.ws_close_reason
     61 
     62     # pywebsocket sets pseudo code for receiving an empty body close frame.
     63     if code == common.STATUS_NO_STATUS_RECEIVED:
     64         code = None
     65         reason = ''
     66     return code, reason
     67 
     68 
     69 # vi:sts=4 sw=4 et
     70