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| import struct | |
| import SocketServer | |
| from base64 import b64encode | |
| from hashlib import sha1 | |
| from mimetools import Message | |
| from StringIO import StringIO | |
| class WebSocketsHandler(SocketServer.StreamRequestHandler): | |
| magic = '258EAFA5-E914-47DA-95CA-C5AB0DC85B11' | |
| def setup(self): | |
| SocketServer.StreamRequestHandler.setup(self) | |
| print "connection established", self.client_address | |
| self.handshake_done = False | |
| def handle(self): | |
| while True: | |
| if not self.handshake_done: | |
| self.handshake() | |
| else: | |
| self.read_next_message() | |
| def read_next_message(self): | |
| length = ord(self.rfile.read(2)[1]) & 127 | |
| if length == 126: | |
| length = struct.unpack(">H", self.rfile.read(2))[0] | |
| elif length == 127: | |
| length = struct.unpack(">Q", self.rfile.read(8))[0] | |
| masks = [ord(byte) for byte in self.rfile.read(4)] | |
| decoded = "" | |
| for char in self.rfile.read(length): | |
| decoded += chr(ord(char) ^ masks[len(decoded) % 4]) | |
| self.on_message(decoded) | |
| def send_message(self, message): | |
| self.request.send(chr(129)) | |
| length = len(message) | |
| if length <= 125: | |
| self.request.send(chr(length)) | |
| elif length >= 126 and length <= 65535: | |
| self.request.send(126) | |
| self.request.send(struct.pack(">H", length)) | |
| else: | |
| self.request.send(127) | |
| self.request.send(struct.pack(">Q", length)) | |
| self.request.send(message) | |
| def handshake(self): | |
| data = self.request.recv(1024).strip() | |
| headers = Message(StringIO(data.split('\r\n', 1)[1])) | |
| if headers.get("Upgrade", None) != "websocket": | |
| return | |
| print 'Handshaking...' | |
| key = headers['Sec-WebSocket-Key'] | |
| digest = b64encode(sha1(key + self.magic).hexdigest().decode('hex')) | |
| response = 'HTTP/1.1 101 Switching Protocols\r\n' | |
| response += 'Upgrade: websocket\r\n' | |
| response += 'Connection: Upgrade\r\n' | |
| response += 'Sec-WebSocket-Accept: %s\r\n\r\n' % digest | |
| self.handshake_done = self.request.send(response) | |
| def on_message(self, message): | |
| print messsage | |
| if __name__ == "__main__": | |
| server = SocketServer.TCPServer( | |
| ("localhost", 9999), WebSocketsHandler) | |
| server.serve_forever() |
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