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import re
from mod_pywebsocket import common
from mod_pywebsocket import stream
from mod_pywebsocket.extensions import DeflateFrameExtensionProcessor
bit = 0
def _get_deflate_frame_extension_processor(request):
for extension_processor in request.ws_extension_processors:
if isinstance(extension_processor, DeflateFrameExtensionProcessor):
return extension_processor
return None
def web_socket_do_extra_handshake(request):
match = re.search(r'\?compressed=(true|false)&bitNumber=(\d)$',
request.ws_resource)
if match is None:
msgutil.send_message(request,
'FAIL: Query value is incorrect or missing')
return
global bit
compressed = match.group(1)
bit = int(match.group(2))
if compressed == "false":
request.ws_extension_processors = [] # using no extension response
else:
processor = _get_deflate_frame_extension_processor(request)
if processor is None:
request.ws_extension_processors = [] # using no extension response
else:
request.ws_extension_processors = [processor] # avoid conflict
def web_socket_transfer_data(request):
text = "This message should be ignored."
opcode = common.OPCODE_TEXT
if bit == 1:
frame = stream.create_header(opcode, len(text), 1, 1, 0, 0, 0) + text
elif bit == 2:
frame = stream.create_header(opcode, len(text), 1, 0, 1, 0, 0) + text
elif bit == 3:
frame = stream.create_header(opcode, len(text), 1, 0, 0, 1, 0) + text
else:
frame = stream.create_text_frame('FAIL: Invalid bit number: %d' % bit)
request.connection.write(frame)
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