654 lines
24 KiB
Python
654 lines
24 KiB
Python
|
"""WebSocket protocol versions 13 and 8."""
|
||
|
|
|
||
|
|
import asyncio
|
||
|
|
import collections
|
||
|
|
import json
|
||
|
|
import random
|
||
|
|
import re
|
||
|
|
import sys
|
||
|
|
import zlib
|
||
|
|
from enum import IntEnum
|
||
|
|
from struct import Struct
|
||
|
|
from typing import Any, Callable, List, Optional, Tuple, Union
|
||
|
|
|
||
|
|
from .base_protocol import BaseProtocol
|
||
|
|
from .helpers import NO_EXTENSIONS
|
||
|
|
from .log import ws_logger
|
||
|
|
from .streams import DataQueue
|
||
|
|
|
||
|
|
__all__ = ('WS_CLOSED_MESSAGE', 'WS_CLOSING_MESSAGE', 'WS_KEY',
|
||
|
|
'WebSocketReader', 'WebSocketWriter', 'WSMessage',
|
||
|
|
'WebSocketError', 'WSMsgType', 'WSCloseCode')
|
||
|
|
|
||
|
|
|
||
|
|
class WSCloseCode(IntEnum):
|
||
|
|
OK = 1000
|
||
|
|
GOING_AWAY = 1001
|
||
|
|
PROTOCOL_ERROR = 1002
|
||
|
|
UNSUPPORTED_DATA = 1003
|
||
|
|
INVALID_TEXT = 1007
|
||
|
|
POLICY_VIOLATION = 1008
|
||
|
|
MESSAGE_TOO_BIG = 1009
|
||
|
|
MANDATORY_EXTENSION = 1010
|
||
|
|
INTERNAL_ERROR = 1011
|
||
|
|
SERVICE_RESTART = 1012
|
||
|
|
TRY_AGAIN_LATER = 1013
|
||
|
|
|
||
|
|
|
||
|
|
ALLOWED_CLOSE_CODES = {int(i) for i in WSCloseCode}
|
||
|
|
|
||
|
|
|
||
|
|
class WSMsgType(IntEnum):
|
||
|
|
# websocket spec types
|
||
|
|
CONTINUATION = 0x0
|
||
|
|
TEXT = 0x1
|
||
|
|
BINARY = 0x2
|
||
|
|
PING = 0x9
|
||
|
|
PONG = 0xa
|
||
|
|
CLOSE = 0x8
|
||
|
|
|
||
|
|
# aiohttp specific types
|
||
|
|
CLOSING = 0x100
|
||
|
|
CLOSED = 0x101
|
||
|
|
ERROR = 0x102
|
||
|
|
|
||
|
|
text = TEXT
|
||
|
|
binary = BINARY
|
||
|
|
ping = PING
|
||
|
|
pong = PONG
|
||
|
|
close = CLOSE
|
||
|
|
closing = CLOSING
|
||
|
|
closed = CLOSED
|
||
|
|
error = ERROR
|
||
|
|
|
||
|
|
|
||
|
|
WS_KEY = b'258EAFA5-E914-47DA-95CA-C5AB0DC85B11'
|
||
|
|
|
||
|
|
|
||
|
|
UNPACK_LEN2 = Struct('!H').unpack_from
|
||
|
|
UNPACK_LEN3 = Struct('!Q').unpack_from
|
||
|
|
UNPACK_CLOSE_CODE = Struct('!H').unpack
|
||
|
|
PACK_LEN1 = Struct('!BB').pack
|
||
|
|
PACK_LEN2 = Struct('!BBH').pack
|
||
|
|
PACK_LEN3 = Struct('!BBQ').pack
|
||
|
|
PACK_CLOSE_CODE = Struct('!H').pack
|
||
|
|
MSG_SIZE = 2 ** 14
|
||
|
|
DEFAULT_LIMIT = 2 ** 16
|
||
|
|
|
||
|
|
|
||
|
|
_WSMessageBase = collections.namedtuple('_WSMessageBase',
|
||
|
|
['type', 'data', 'extra'])
|
||
|
|
|
||
|
|
|
||
|
|
class WSMessage(_WSMessageBase):
|
||
|
|
|
||
|
|
def json(self, *, # type: ignore
|
||
|
|
loads: Callable[[Any], Any]=json.loads) -> None:
|
||
|
|
"""Return parsed JSON data.
|
||
|
|
|
||
|
|
.. versionadded:: 0.22
|
||
|
|
"""
|
||
|
|
return loads(self.data)
|
||
|
|
|
||
|
|
|
||
|
|
WS_CLOSED_MESSAGE = WSMessage(WSMsgType.CLOSED, None, None)
|
||
|
|
WS_CLOSING_MESSAGE = WSMessage(WSMsgType.CLOSING, None, None)
|
||
|
|
|
||
|
|
|
||
|
|
class WebSocketError(Exception):
|
||
|
|
"""WebSocket protocol parser error."""
|
||
|
|
|
||
|
|
def __init__(self, code: int, message: str) -> None:
|
||
|
|
self.code = code
|
||
|
|
super().__init__(message)
|
||
|
|
|
||
|
|
|
||
|
|
class WSHandshakeError(Exception):
|
||
|
|
"""WebSocket protocol handshake error."""
|
||
|
|
|
||
|
|
|
||
|
|
native_byteorder = sys.byteorder
|
||
|
|
|
||
|
|
|
||
|
|
# Used by _websocket_mask_python
|
||
|
|
_XOR_TABLE = [bytes(a ^ b for a in range(256)) for b in range(256)]
|
||
|
|
|
||
|
|
|
||
|
|
def _websocket_mask_python(mask: bytes, data: bytearray) -> None:
|
||
|
|
"""Websocket masking function.
|
||
|
|
|
||
|
|
`mask` is a `bytes` object of length 4; `data` is a `bytearray`
|
||
|
|
object of any length. The contents of `data` are masked with `mask`,
|
||
|
|
as specified in section 5.3 of RFC 6455.
|
||
|
|
|
||
|
|
Note that this function mutates the `data` argument.
|
||
|
|
|
||
|
|
This pure-python implementation may be replaced by an optimized
|
||
|
|
version when available.
|
||
|
|
|
||
|
|
"""
|
||
|
|
assert isinstance(data, bytearray), data
|
||
|
|
assert len(mask) == 4, mask
|
||
|
|
|
||
|
|
if data:
|
||
|
|
a, b, c, d = (_XOR_TABLE[n] for n in mask)
|
||
|
|
data[::4] = data[::4].translate(a)
|
||
|
|
data[1::4] = data[1::4].translate(b)
|
||
|
|
data[2::4] = data[2::4].translate(c)
|
||
|
|
data[3::4] = data[3::4].translate(d)
|
||
|
|
|
||
|
|
|
||
|
|
if NO_EXTENSIONS: # pragma: no cover
|
||
|
|
_websocket_mask = _websocket_mask_python
|
||
|
|
else:
|
||
|
|
try:
|
||
|
|
from ._websocket import _websocket_mask_cython # type: ignore
|
||
|
|
_websocket_mask = _websocket_mask_cython
|
||
|
|
except ImportError: # pragma: no cover
|
||
|
|
_websocket_mask = _websocket_mask_python
|
||
|
|
|
||
|
|
_WS_DEFLATE_TRAILING = bytes([0x00, 0x00, 0xff, 0xff])
|
||
|
|
|
||
|
|
|
||
|
|
_WS_EXT_RE = re.compile(r'^(?:;\s*(?:'
|
||
|
|
r'(server_no_context_takeover)|'
|
||
|
|
r'(client_no_context_takeover)|'
|
||
|
|
r'(server_max_window_bits(?:=(\d+))?)|'
|
||
|
|
r'(client_max_window_bits(?:=(\d+))?)))*$')
|
||
|
|
|
||
|
|
_WS_EXT_RE_SPLIT = re.compile(r'permessage-deflate([^,]+)?')
|
||
|
|
|
||
|
|
|
||
|
|
def ws_ext_parse(extstr: str, isserver: bool=False) -> Tuple[int, bool]:
|
||
|
|
if not extstr:
|
||
|
|
return 0, False
|
||
|
|
|
||
|
|
compress = 0
|
||
|
|
notakeover = False
|
||
|
|
for ext in _WS_EXT_RE_SPLIT.finditer(extstr):
|
||
|
|
defext = ext.group(1)
|
||
|
|
# Return compress = 15 when get `permessage-deflate`
|
||
|
|
if not defext:
|
||
|
|
compress = 15
|
||
|
|
break
|
||
|
|
match = _WS_EXT_RE.match(defext)
|
||
|
|
if match:
|
||
|
|
compress = 15
|
||
|
|
if isserver:
|
||
|
|
# Server never fail to detect compress handshake.
|
||
|
|
# Server does not need to send max wbit to client
|
||
|
|
if match.group(4):
|
||
|
|
compress = int(match.group(4))
|
||
|
|
# Group3 must match if group4 matches
|
||
|
|
# Compress wbit 8 does not support in zlib
|
||
|
|
# If compress level not support,
|
||
|
|
# CONTINUE to next extension
|
||
|
|
if compress > 15 or compress < 9:
|
||
|
|
compress = 0
|
||
|
|
continue
|
||
|
|
if match.group(1):
|
||
|
|
notakeover = True
|
||
|
|
# Ignore regex group 5 & 6 for client_max_window_bits
|
||
|
|
break
|
||
|
|
else:
|
||
|
|
if match.group(6):
|
||
|
|
compress = int(match.group(6))
|
||
|
|
# Group5 must match if group6 matches
|
||
|
|
# Compress wbit 8 does not support in zlib
|
||
|
|
# If compress level not support,
|
||
|
|
# FAIL the parse progress
|
||
|
|
if compress > 15 or compress < 9:
|
||
|
|
raise WSHandshakeError('Invalid window size')
|
||
|
|
if match.group(2):
|
||
|
|
notakeover = True
|
||
|
|
# Ignore regex group 5 & 6 for client_max_window_bits
|
||
|
|
break
|
||
|
|
# Return Fail if client side and not match
|
||
|
|
elif not isserver:
|
||
|
|
raise WSHandshakeError('Extension for deflate not supported' +
|
||
|
|
ext.group(1))
|
||
|
|
|
||
|
|
return compress, notakeover
|
||
|
|
|
||
|
|
|
||
|
|
def ws_ext_gen(compress: int=15, isserver: bool=False,
|
||
|
|
server_notakeover: bool=False) -> str:
|
||
|
|
# client_notakeover=False not used for server
|
||
|
|
# compress wbit 8 does not support in zlib
|
||
|
|
if compress < 9 or compress > 15:
|
||
|
|
raise ValueError('Compress wbits must between 9 and 15, '
|
||
|
|
'zlib does not support wbits=8')
|
||
|
|
enabledext = ['permessage-deflate']
|
||
|
|
if not isserver:
|
||
|
|
enabledext.append('client_max_window_bits')
|
||
|
|
|
||
|
|
if compress < 15:
|
||
|
|
enabledext.append('server_max_window_bits=' + str(compress))
|
||
|
|
if server_notakeover:
|
||
|
|
enabledext.append('server_no_context_takeover')
|
||
|
|
# if client_notakeover:
|
||
|
|
# enabledext.append('client_no_context_takeover')
|
||
|
|
return '; '.join(enabledext)
|
||
|
|
|
||
|
|
|
||
|
|
class WSParserState(IntEnum):
|
||
|
|
READ_HEADER = 1
|
||
|
|
READ_PAYLOAD_LENGTH = 2
|
||
|
|
READ_PAYLOAD_MASK = 3
|
||
|
|
READ_PAYLOAD = 4
|
||
|
|
|
||
|
|
|
||
|
|
class WebSocketReader:
|
||
|
|
|
||
|
|
def __init__(self, queue: DataQueue[WSMessage],
|
||
|
|
max_msg_size: int, compress: bool=True) -> None:
|
||
|
|
self.queue = queue
|
||
|
|
self._max_msg_size = max_msg_size
|
||
|
|
|
||
|
|
self._exc = None # type: Optional[BaseException]
|
||
|
|
self._partial = bytearray()
|
||
|
|
self._state = WSParserState.READ_HEADER
|
||
|
|
|
||
|
|
self._opcode = None # type: Optional[int]
|
||
|
|
self._frame_fin = False
|
||
|
|
self._frame_opcode = None # type: Optional[int]
|
||
|
|
self._frame_payload = bytearray()
|
||
|
|
|
||
|
|
self._tail = b''
|
||
|
|
self._has_mask = False
|
||
|
|
self._frame_mask = None # type: Optional[bytes]
|
||
|
|
self._payload_length = 0
|
||
|
|
self._payload_length_flag = 0
|
||
|
|
self._compressed = None # type: Optional[bool]
|
||
|
|
self._decompressobj = None # type: Any # zlib.decompressobj actually
|
||
|
|
self._compress = compress
|
||
|
|
|
||
|
|
def feed_eof(self) -> None:
|
||
|
|
self.queue.feed_eof()
|
||
|
|
|
||
|
|
def feed_data(self, data: bytes) -> Tuple[bool, bytes]:
|
||
|
|
if self._exc:
|
||
|
|
return True, data
|
||
|
|
|
||
|
|
try:
|
||
|
|
return self._feed_data(data)
|
||
|
|
except Exception as exc:
|
||
|
|
self._exc = exc
|
||
|
|
self.queue.set_exception(exc)
|
||
|
|
return True, b''
|
||
|
|
|
||
|
|
def _feed_data(self, data: bytes) -> Tuple[bool, bytes]:
|
||
|
|
for fin, opcode, payload, compressed in self.parse_frame(data):
|
||
|
|
if compressed and not self._decompressobj:
|
||
|
|
self._decompressobj = zlib.decompressobj(wbits=-zlib.MAX_WBITS)
|
||
|
|
if opcode == WSMsgType.CLOSE:
|
||
|
|
if len(payload) >= 2:
|
||
|
|
close_code = UNPACK_CLOSE_CODE(payload[:2])[0]
|
||
|
|
if (close_code < 3000 and
|
||
|
|
close_code not in ALLOWED_CLOSE_CODES):
|
||
|
|
raise WebSocketError(
|
||
|
|
WSCloseCode.PROTOCOL_ERROR,
|
||
|
|
'Invalid close code: {}'.format(close_code))
|
||
|
|
try:
|
||
|
|
close_message = payload[2:].decode('utf-8')
|
||
|
|
except UnicodeDecodeError as exc:
|
||
|
|
raise WebSocketError(
|
||
|
|
WSCloseCode.INVALID_TEXT,
|
||
|
|
'Invalid UTF-8 text message') from exc
|
||
|
|
msg = WSMessage(WSMsgType.CLOSE, close_code, close_message)
|
||
|
|
elif payload:
|
||
|
|
raise WebSocketError(
|
||
|
|
WSCloseCode.PROTOCOL_ERROR,
|
||
|
|
'Invalid close frame: {} {} {!r}'.format(
|
||
|
|
fin, opcode, payload))
|
||
|
|
else:
|
||
|
|
msg = WSMessage(WSMsgType.CLOSE, 0, '')
|
||
|
|
|
||
|
|
self.queue.feed_data(msg, 0)
|
||
|
|
|
||
|
|
elif opcode == WSMsgType.PING:
|
||
|
|
self.queue.feed_data(
|
||
|
|
WSMessage(WSMsgType.PING, payload, ''), len(payload))
|
||
|
|
|
||
|
|
elif opcode == WSMsgType.PONG:
|
||
|
|
self.queue.feed_data(
|
||
|
|
WSMessage(WSMsgType.PONG, payload, ''), len(payload))
|
||
|
|
|
||
|
|
elif opcode not in (
|
||
|
|
WSMsgType.TEXT, WSMsgType.BINARY) and self._opcode is None:
|
||
|
|
raise WebSocketError(
|
||
|
|
WSCloseCode.PROTOCOL_ERROR,
|
||
|
|
"Unexpected opcode={!r}".format(opcode))
|
||
|
|
else:
|
||
|
|
# load text/binary
|
||
|
|
if not fin:
|
||
|
|
# got partial frame payload
|
||
|
|
if opcode != WSMsgType.CONTINUATION:
|
||
|
|
self._opcode = opcode
|
||
|
|
self._partial.extend(payload)
|
||
|
|
if (self._max_msg_size and
|
||
|
|
len(self._partial) >= self._max_msg_size):
|
||
|
|
raise WebSocketError(
|
||
|
|
WSCloseCode.MESSAGE_TOO_BIG,
|
||
|
|
"Message size {} exceeds limit {}".format(
|
||
|
|
len(self._partial), self._max_msg_size))
|
||
|
|
else:
|
||
|
|
# previous frame was non finished
|
||
|
|
# we should get continuation opcode
|
||
|
|
if self._partial:
|
||
|
|
if opcode != WSMsgType.CONTINUATION:
|
||
|
|
raise WebSocketError(
|
||
|
|
WSCloseCode.PROTOCOL_ERROR,
|
||
|
|
'The opcode in non-fin frame is expected '
|
||
|
|
'to be zero, got {!r}'.format(opcode))
|
||
|
|
|
||
|
|
if opcode == WSMsgType.CONTINUATION:
|
||
|
|
assert self._opcode is not None
|
||
|
|
opcode = self._opcode
|
||
|
|
self._opcode = None
|
||
|
|
|
||
|
|
self._partial.extend(payload)
|
||
|
|
if (self._max_msg_size and
|
||
|
|
len(self._partial) >= self._max_msg_size):
|
||
|
|
raise WebSocketError(
|
||
|
|
WSCloseCode.MESSAGE_TOO_BIG,
|
||
|
|
"Message size {} exceeds limit {}".format(
|
||
|
|
len(self._partial), self._max_msg_size))
|
||
|
|
|
||
|
|
# Decompress process must to be done after all packets
|
||
|
|
# received.
|
||
|
|
if compressed:
|
||
|
|
self._partial.extend(_WS_DEFLATE_TRAILING)
|
||
|
|
payload_merged = self._decompressobj.decompress(
|
||
|
|
self._partial, self._max_msg_size)
|
||
|
|
if self._decompressobj.unconsumed_tail:
|
||
|
|
left = len(self._decompressobj.unconsumed_tail)
|
||
|
|
raise WebSocketError(
|
||
|
|
WSCloseCode.MESSAGE_TOO_BIG,
|
||
|
|
"Decompressed message size exceeds limit {}".
|
||
|
|
format(self._max_msg_size + left,
|
||
|
|
self._max_msg_size))
|
||
|
|
else:
|
||
|
|
payload_merged = bytes(self._partial)
|
||
|
|
|
||
|
|
self._partial.clear()
|
||
|
|
|
||
|
|
if opcode == WSMsgType.TEXT:
|
||
|
|
try:
|
||
|
|
text = payload_merged.decode('utf-8')
|
||
|
|
self.queue.feed_data(
|
||
|
|
WSMessage(WSMsgType.TEXT, text, ''), len(text))
|
||
|
|
except UnicodeDecodeError as exc:
|
||
|
|
raise WebSocketError(
|
||
|
|
WSCloseCode.INVALID_TEXT,
|
||
|
|
'Invalid UTF-8 text message') from exc
|
||
|
|
else:
|
||
|
|
self.queue.feed_data(
|
||
|
|
WSMessage(WSMsgType.BINARY, payload_merged, ''),
|
||
|
|
len(payload_merged))
|
||
|
|
|
||
|
|
return False, b''
|
||
|
|
|
||
|
|
def parse_frame(self, buf: bytes) -> List[Tuple[bool, Optional[int],
|
||
|
|
bytearray,
|
||
|
|
Optional[bool]]]:
|
||
|
|
"""Return the next frame from the socket."""
|
||
|
|
frames = []
|
||
|
|
if self._tail:
|
||
|
|
buf, self._tail = self._tail + buf, b''
|
||
|
|
|
||
|
|
start_pos = 0
|
||
|
|
buf_length = len(buf)
|
||
|
|
|
||
|
|
while True:
|
||
|
|
# read header
|
||
|
|
if self._state == WSParserState.READ_HEADER:
|
||
|
|
if buf_length - start_pos >= 2:
|
||
|
|
data = buf[start_pos:start_pos+2]
|
||
|
|
start_pos += 2
|
||
|
|
first_byte, second_byte = data
|
||
|
|
|
||
|
|
fin = (first_byte >> 7) & 1
|
||
|
|
rsv1 = (first_byte >> 6) & 1
|
||
|
|
rsv2 = (first_byte >> 5) & 1
|
||
|
|
rsv3 = (first_byte >> 4) & 1
|
||
|
|
opcode = first_byte & 0xf
|
||
|
|
|
||
|
|
# frame-fin = %x0 ; more frames of this message follow
|
||
|
|
# / %x1 ; final frame of this message
|
||
|
|
# frame-rsv1 = %x0 ;
|
||
|
|
# 1 bit, MUST be 0 unless negotiated otherwise
|
||
|
|
# frame-rsv2 = %x0 ;
|
||
|
|
# 1 bit, MUST be 0 unless negotiated otherwise
|
||
|
|
# frame-rsv3 = %x0 ;
|
||
|
|
# 1 bit, MUST be 0 unless negotiated otherwise
|
||
|
|
#
|
||
|
|
# Remove rsv1 from this test for deflate development
|
||
|
|
if rsv2 or rsv3 or (rsv1 and not self._compress):
|
||
|
|
raise WebSocketError(
|
||
|
|
WSCloseCode.PROTOCOL_ERROR,
|
||
|
|
'Received frame with non-zero reserved bits')
|
||
|
|
|
||
|
|
if opcode > 0x7 and fin == 0:
|
||
|
|
raise WebSocketError(
|
||
|
|
WSCloseCode.PROTOCOL_ERROR,
|
||
|
|
'Received fragmented control frame')
|
||
|
|
|
||
|
|
has_mask = (second_byte >> 7) & 1
|
||
|
|
length = second_byte & 0x7f
|
||
|
|
|
||
|
|
# Control frames MUST have a payload
|
||
|
|
# length of 125 bytes or less
|
||
|
|
if opcode > 0x7 and length > 125:
|
||
|
|
raise WebSocketError(
|
||
|
|
WSCloseCode.PROTOCOL_ERROR,
|
||
|
|
'Control frame payload cannot be '
|
||
|
|
'larger than 125 bytes')
|
||
|
|
|
||
|
|
# Set compress status if last package is FIN
|
||
|
|
# OR set compress status if this is first fragment
|
||
|
|
# Raise error if not first fragment with rsv1 = 0x1
|
||
|
|
if self._frame_fin or self._compressed is None:
|
||
|
|
self._compressed = True if rsv1 else False
|
||
|
|
elif rsv1:
|
||
|
|
raise WebSocketError(
|
||
|
|
WSCloseCode.PROTOCOL_ERROR,
|
||
|
|
'Received frame with non-zero reserved bits')
|
||
|
|
|
||
|
|
self._frame_fin = bool(fin)
|
||
|
|
self._frame_opcode = opcode
|
||
|
|
self._has_mask = bool(has_mask)
|
||
|
|
self._payload_length_flag = length
|
||
|
|
self._state = WSParserState.READ_PAYLOAD_LENGTH
|
||
|
|
else:
|
||
|
|
break
|
||
|
|
|
||
|
|
# read payload length
|
||
|
|
if self._state == WSParserState.READ_PAYLOAD_LENGTH:
|
||
|
|
length = self._payload_length_flag
|
||
|
|
if length == 126:
|
||
|
|
if buf_length - start_pos >= 2:
|
||
|
|
data = buf[start_pos:start_pos+2]
|
||
|
|
start_pos += 2
|
||
|
|
length = UNPACK_LEN2(data)[0]
|
||
|
|
self._payload_length = length
|
||
|
|
self._state = (
|
||
|
|
WSParserState.READ_PAYLOAD_MASK
|
||
|
|
if self._has_mask
|
||
|
|
else WSParserState.READ_PAYLOAD)
|
||
|
|
else:
|
||
|
|
break
|
||
|
|
elif length > 126:
|
||
|
|
if buf_length - start_pos >= 8:
|
||
|
|
data = buf[start_pos:start_pos+8]
|
||
|
|
start_pos += 8
|
||
|
|
length = UNPACK_LEN3(data)[0]
|
||
|
|
self._payload_length = length
|
||
|
|
self._state = (
|
||
|
|
WSParserState.READ_PAYLOAD_MASK
|
||
|
|
if self._has_mask
|
||
|
|
else WSParserState.READ_PAYLOAD)
|
||
|
|
else:
|
||
|
|
break
|
||
|
|
else:
|
||
|
|
self._payload_length = length
|
||
|
|
self._state = (
|
||
|
|
WSParserState.READ_PAYLOAD_MASK
|
||
|
|
if self._has_mask
|
||
|
|
else WSParserState.READ_PAYLOAD)
|
||
|
|
|
||
|
|
# read payload mask
|
||
|
|
if self._state == WSParserState.READ_PAYLOAD_MASK:
|
||
|
|
if buf_length - start_pos >= 4:
|
||
|
|
self._frame_mask = buf[start_pos:start_pos+4]
|
||
|
|
start_pos += 4
|
||
|
|
self._state = WSParserState.READ_PAYLOAD
|
||
|
|
else:
|
||
|
|
break
|
||
|
|
|
||
|
|
if self._state == WSParserState.READ_PAYLOAD:
|
||
|
|
length = self._payload_length
|
||
|
|
payload = self._frame_payload
|
||
|
|
|
||
|
|
chunk_len = buf_length - start_pos
|
||
|
|
if length >= chunk_len:
|
||
|
|
self._payload_length = length - chunk_len
|
||
|
|
payload.extend(buf[start_pos:])
|
||
|
|
start_pos = buf_length
|
||
|
|
else:
|
||
|
|
self._payload_length = 0
|
||
|
|
payload.extend(buf[start_pos:start_pos+length])
|
||
|
|
start_pos = start_pos + length
|
||
|
|
|
||
|
|
if self._payload_length == 0:
|
||
|
|
if self._has_mask:
|
||
|
|
assert self._frame_mask is not None
|
||
|
|
_websocket_mask(self._frame_mask, payload)
|
||
|
|
|
||
|
|
frames.append((
|
||
|
|
self._frame_fin,
|
||
|
|
self._frame_opcode,
|
||
|
|
payload,
|
||
|
|
self._compressed))
|
||
|
|
|
||
|
|
self._frame_payload = bytearray()
|
||
|
|
self._state = WSParserState.READ_HEADER
|
||
|
|
else:
|
||
|
|
break
|
||
|
|
|
||
|
|
self._tail = buf[start_pos:]
|
||
|
|
|
||
|
|
return frames
|
||
|
|
|
||
|
|
|
||
|
|
class WebSocketWriter:
|
||
|
|
|
||
|
|
def __init__(self, protocol: BaseProtocol, transport: asyncio.Transport, *,
|
||
|
|
use_mask: bool=False, limit: int=DEFAULT_LIMIT,
|
||
|
|
random: Any=random.Random(),
|
||
|
|
compress: int=0, notakeover: bool=False) -> None:
|
||
|
|
self.protocol = protocol
|
||
|
|
self.transport = transport
|
||
|
|
self.use_mask = use_mask
|
||
|
|
self.randrange = random.randrange
|
||
|
|
self.compress = compress
|
||
|
|
self.notakeover = notakeover
|
||
|
|
self._closing = False
|
||
|
|
self._limit = limit
|
||
|
|
self._output_size = 0
|
||
|
|
self._compressobj = None # type: Any # actually compressobj
|
||
|
|
|
||
|
|
async def _send_frame(self, message: bytes, opcode: int,
|
||
|
|
compress: Optional[int]=None) -> None:
|
||
|
|
"""Send a frame over the websocket with message as its payload."""
|
||
|
|
if self._closing:
|
||
|
|
ws_logger.warning('websocket connection is closing.')
|
||
|
|
|
||
|
|
rsv = 0
|
||
|
|
|
||
|
|
# Only compress larger packets (disabled)
|
||
|
|
# Does small packet needs to be compressed?
|
||
|
|
# if self.compress and opcode < 8 and len(message) > 124:
|
||
|
|
if (compress or self.compress) and opcode < 8:
|
||
|
|
if compress:
|
||
|
|
# Do not set self._compress if compressing is for this frame
|
||
|
|
compressobj = zlib.compressobj(wbits=-compress)
|
||
|
|
else: # self.compress
|
||
|
|
if not self._compressobj:
|
||
|
|
self._compressobj = zlib.compressobj(wbits=-self.compress)
|
||
|
|
compressobj = self._compressobj
|
||
|
|
|
||
|
|
message = compressobj.compress(message)
|
||
|
|
message = message + compressobj.flush(
|
||
|
|
zlib.Z_FULL_FLUSH if self.notakeover else zlib.Z_SYNC_FLUSH)
|
||
|
|
if message.endswith(_WS_DEFLATE_TRAILING):
|
||
|
|
message = message[:-4]
|
||
|
|
rsv = rsv | 0x40
|
||
|
|
|
||
|
|
msg_length = len(message)
|
||
|
|
|
||
|
|
use_mask = self.use_mask
|
||
|
|
if use_mask:
|
||
|
|
mask_bit = 0x80
|
||
|
|
else:
|
||
|
|
mask_bit = 0
|
||
|
|
|
||
|
|
if msg_length < 126:
|
||
|
|
header = PACK_LEN1(0x80 | rsv | opcode, msg_length | mask_bit)
|
||
|
|
elif msg_length < (1 << 16):
|
||
|
|
header = PACK_LEN2(0x80 | rsv | opcode, 126 | mask_bit, msg_length)
|
||
|
|
else:
|
||
|
|
header = PACK_LEN3(0x80 | rsv | opcode, 127 | mask_bit, msg_length)
|
||
|
|
if use_mask:
|
||
|
|
mask = self.randrange(0, 0xffffffff)
|
||
|
|
mask = mask.to_bytes(4, 'big')
|
||
|
|
message = bytearray(message)
|
||
|
|
_websocket_mask(mask, message)
|
||
|
|
self.transport.write(header + mask + message)
|
||
|
|
self._output_size += len(header) + len(mask) + len(message)
|
||
|
|
else:
|
||
|
|
if len(message) > MSG_SIZE:
|
||
|
|
self.transport.write(header)
|
||
|
|
self.transport.write(message)
|
||
|
|
else:
|
||
|
|
self.transport.write(header + message)
|
||
|
|
|
||
|
|
self._output_size += len(header) + len(message)
|
||
|
|
|
||
|
|
if self._output_size > self._limit:
|
||
|
|
self._output_size = 0
|
||
|
|
await self.protocol._drain_helper()
|
||
|
|
|
||
|
|
async def pong(self, message: bytes=b'') -> None:
|
||
|
|
"""Send pong message."""
|
||
|
|
if isinstance(message, str):
|
||
|
|
message = message.encode('utf-8')
|
||
|
|
await self._send_frame(message, WSMsgType.PONG)
|
||
|
|
|
||
|
|
async def ping(self, message: bytes=b'') -> None:
|
||
|
|
"""Send ping message."""
|
||
|
|
if isinstance(message, str):
|
||
|
|
message = message.encode('utf-8')
|
||
|
|
await self._send_frame(message, WSMsgType.PING)
|
||
|
|
|
||
|
|
async def send(self, message: Union[str, bytes],
|
||
|
|
binary: bool=False,
|
||
|
|
compress: Optional[int]=None) -> None:
|
||
|
|
"""Send a frame over the websocket with message as its payload."""
|
||
|
|
if isinstance(message, str):
|
||
|
|
message = message.encode('utf-8')
|
||
|
|
if binary:
|
||
|
|
await self._send_frame(message, WSMsgType.BINARY, compress)
|
||
|
|
else:
|
||
|
|
await self._send_frame(message, WSMsgType.TEXT, compress)
|
||
|
|
|
||
|
|
async def close(self, code: int=1000, message: bytes=b'') -> None:
|
||
|
|
"""Close the websocket, sending the specified code and message."""
|
||
|
|
if isinstance(message, str):
|
||
|
|
message = message.encode('utf-8')
|
||
|
|
try:
|
||
|
|
await self._send_frame(
|
||
|
|
PACK_CLOSE_CODE(code) + message, opcode=WSMsgType.CLOSE)
|
||
|
|
finally:
|
||
|
|
self._closing = True
|