47 lines
1.5 KiB
Python
47 lines
1.5 KiB
Python
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import urllib
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from . import packet
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class Payload(object):
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"""Engine.IO payload."""
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max_decode_packets = 16
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def __init__(self, packets=None, encoded_payload=None):
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self.packets = packets or []
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if encoded_payload is not None:
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self.decode(encoded_payload)
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def encode(self, jsonp_index=None):
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"""Encode the payload for transmission."""
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encoded_payload = ''
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for pkt in self.packets:
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if encoded_payload:
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encoded_payload += '\x1e'
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encoded_payload += pkt.encode(b64=True)
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if jsonp_index is not None:
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encoded_payload = '___eio[' + \
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str(jsonp_index) + \
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']("' + \
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encoded_payload.replace('"', '\\"') + \
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'");'
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return encoded_payload
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def decode(self, encoded_payload):
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"""Decode a transmitted payload."""
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self.packets = []
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if len(encoded_payload) == 0:
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return
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# JSONP POST payload starts with 'd='
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if encoded_payload.startswith('d='):
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encoded_payload = urllib.parse.parse_qs(
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encoded_payload)['d'][0]
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encoded_packets = encoded_payload.split('\x1e')
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if len(encoded_packets) > self.max_decode_packets:
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raise ValueError('Too many packets in payload')
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self.packets = [packet.Packet(encoded_packet=encoded_packet)
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for encoded_packet in encoded_packets]
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