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/usr/share/pyshared/socketio/policyserver.py is in python-socketio 0.3.6-2.

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from gevent.server import StreamServer
import socket

__all__ = ['FlashPolicyServer']


class FlashPolicyServer(StreamServer):
    policyrequest = "<policy-file-request/>"
    policy = """<?xml version="1.0"?><!DOCTYPE cross-domain-policy SYSTEM "http://www.macromedia.com/xml/dtds/cross-domain-policy.dtd">
<cross-domain-policy><allow-access-from domain="*" to-ports="*"/></cross-domain-policy>"""

    def __init__(self, listener=None, backlog=None):
        if listener is None:
            listener = ('0.0.0.0', 10843)
        StreamServer.__init__(self, listener=listener, backlog=backlog)

    def handle(self, sock, address):
        # send and read functions should not wait longer than three seconds
        sock.settimeout(3)
        try:
            # try to receive at most 128 bytes (`POLICYREQUEST` is shorter)
            input = sock.recv(128)
            if input.startswith(FlashPolicyServer.policyrequest):
                sock.sendall(FlashPolicyServer.policy)
        except socket.timeout:
            pass
        sock.close()