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test_websocket_parser.py
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test_websocket_parser.py
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import random
import struct
import zlib
from unittest import mock
import pytest
import aiohttp
from aiohttp import http_websocket
from aiohttp.http import WebSocketError, WSCloseCode, WSMessage, WSMsgType
from aiohttp.http_websocket import (
_WS_DEFLATE_TRAILING,
PACK_CLOSE_CODE,
PACK_LEN1,
PACK_LEN2,
PACK_LEN3,
WebSocketReader,
_websocket_mask,
)
def build_frame(message, opcode, use_mask=False, noheader=False, is_fin=True,
compress=False):
"""Send a frame over the websocket with message as its payload."""
if compress:
compressobj = zlib.compressobj(wbits=-9)
message = compressobj.compress(message)
message = message + compressobj.flush(zlib.Z_SYNC_FLUSH)
if message.endswith(_WS_DEFLATE_TRAILING):
message = message[:-4]
msg_length = len(message)
if use_mask: # pragma: no cover
mask_bit = 0x80
else:
mask_bit = 0
if is_fin:
header_first_byte = 0x80 | opcode
else:
header_first_byte = opcode
if compress:
header_first_byte |= 0x40
if msg_length < 126:
header = PACK_LEN1(
header_first_byte, msg_length | mask_bit)
elif msg_length < (1 << 16): # pragma: no cover
header = PACK_LEN2(
header_first_byte, 126 | mask_bit, msg_length)
else:
header = PACK_LEN3(
header_first_byte, 127 | mask_bit, msg_length)
if use_mask: # pragma: no cover
mask = random.randrange(0, 0xffffffff)
mask = mask.to_bytes(4, 'big')
message = bytearray(message)
_websocket_mask(mask, message)
if noheader:
return message
else:
return header + mask + message
else:
if noheader:
return message
else:
return header + message
def build_close_frame(code=1000, message=b'', noheader=False):
"""Close the websocket, sending the specified code and message."""
if isinstance(message, str): # pragma: no cover
message = message.encode('utf-8')
return build_frame(
PACK_CLOSE_CODE(code) + message,
opcode=WSMsgType.CLOSE, noheader=noheader)
@pytest.fixture()
def out(loop):
return aiohttp.DataQueue(loop)
@pytest.fixture()
def parser(out):
return WebSocketReader(out, 4*1024*1024)
def test_parse_frame(parser) -> None:
parser.parse_frame(struct.pack('!BB', 0b00000001, 0b00000001))
res = parser.parse_frame(b'1')
fin, opcode, payload, compress = res[0]
assert (0, 1, b'1', False) == (fin, opcode, payload, not not compress)
def test_parse_frame_length0(parser) -> None:
fin, opcode, payload, compress = parser.parse_frame(
struct.pack('!BB', 0b00000001, 0b00000000))[0]
assert (0, 1, b'', False) == (fin, opcode, payload, not not compress)
def test_parse_frame_length2(parser) -> None:
parser.parse_frame(struct.pack('!BB', 0b00000001, 126))
parser.parse_frame(struct.pack('!H', 4))
res = parser.parse_frame(b'1234')
fin, opcode, payload, compress = res[0]
assert (0, 1, b'1234', False) == (fin, opcode, payload, not not compress)
def test_parse_frame_length4(parser) -> None:
parser.parse_frame(struct.pack('!BB', 0b00000001, 127))
parser.parse_frame(struct.pack('!Q', 4))
fin, opcode, payload, compress = parser.parse_frame(b'1234')[0]
assert (0, 1, b'1234', False) == (fin, opcode, payload, not not compress)
def test_parse_frame_mask(parser) -> None:
parser.parse_frame(struct.pack('!BB', 0b00000001, 0b10000001))
parser.parse_frame(b'0001')
fin, opcode, payload, compress = parser.parse_frame(b'1')[0]
assert (0, 1, b'\x01', False) == (fin, opcode, payload, not not compress)
def test_parse_frame_header_reversed_bits(out, parser) -> None:
with pytest.raises(WebSocketError):
parser.parse_frame(struct.pack('!BB', 0b01100000, 0b00000000))
raise out.exception()
def test_parse_frame_header_control_frame(out, parser) -> None:
with pytest.raises(WebSocketError):
parser.parse_frame(struct.pack('!BB', 0b00001000, 0b00000000))
raise out.exception()
def _test_parse_frame_header_new_data_err(out, parser):
with pytest.raises(WebSocketError):
parser.parse_frame(struct.pack('!BB', 0b000000000, 0b00000000))
raise out.exception()
def test_parse_frame_header_payload_size(out, parser) -> None:
with pytest.raises(WebSocketError):
parser.parse_frame(struct.pack('!BB', 0b10001000, 0b01111110))
raise out.exception()
def test_ping_frame(out, parser) -> None:
parser.parse_frame = mock.Mock()
parser.parse_frame.return_value = [(1, WSMsgType.PING, b'data', False)]
parser.feed_data(b'')
res = out._buffer[0]
assert res == ((WSMsgType.PING, b'data', ''), 4)
def test_pong_frame(out, parser) -> None:
parser.parse_frame = mock.Mock()
parser.parse_frame.return_value = [(1, WSMsgType.PONG, b'data', False)]
parser.feed_data(b'')
res = out._buffer[0]
assert res == ((WSMsgType.PONG, b'data', ''), 4)
def test_close_frame(out, parser) -> None:
parser.parse_frame = mock.Mock()
parser.parse_frame.return_value = [(1, WSMsgType.CLOSE, b'', False)]
parser.feed_data(b'')
res = out._buffer[0]
assert res == ((WSMsgType.CLOSE, 0, ''), 0)
def test_close_frame_info(out, parser) -> None:
parser.parse_frame = mock.Mock()
parser.parse_frame.return_value = [(1, WSMsgType.CLOSE, b'0112345', False)]
parser.feed_data(b'')
res = out._buffer[0]
assert res == (WSMessage(WSMsgType.CLOSE, 12337, '12345'), 0)
def test_close_frame_invalid(out, parser) -> None:
parser.parse_frame = mock.Mock()
parser.parse_frame.return_value = [(1, WSMsgType.CLOSE, b'1', False)]
parser.feed_data(b'')
assert isinstance(out.exception(), WebSocketError)
assert out.exception().code == WSCloseCode.PROTOCOL_ERROR
def test_close_frame_invalid_2(out, parser) -> None:
data = build_close_frame(code=1)
with pytest.raises(WebSocketError) as ctx:
parser._feed_data(data)
assert ctx.value.code == WSCloseCode.PROTOCOL_ERROR
def test_close_frame_unicode_err(parser) -> None:
data = build_close_frame(
code=1000, message=b'\xf4\x90\x80\x80')
with pytest.raises(WebSocketError) as ctx:
parser._feed_data(data)
assert ctx.value.code == WSCloseCode.INVALID_TEXT
def test_unknown_frame(out, parser) -> None:
parser.parse_frame = mock.Mock()
parser.parse_frame.return_value = [(1, WSMsgType.CONTINUATION, b'', False)]
with pytest.raises(WebSocketError):
parser.feed_data(b'')
raise out.exception()
def test_simple_text(out, parser) -> None:
data = build_frame(b'text', WSMsgType.TEXT)
parser._feed_data(data)
res = out._buffer[0]
assert res == ((WSMsgType.TEXT, 'text', ''), 4)
def test_simple_text_unicode_err(parser) -> None:
data = build_frame(b'\xf4\x90\x80\x80', WSMsgType.TEXT)
with pytest.raises(WebSocketError) as ctx:
parser._feed_data(data)
assert ctx.value.code == WSCloseCode.INVALID_TEXT
def test_simple_binary(out, parser) -> None:
parser.parse_frame = mock.Mock()
parser.parse_frame.return_value = [(1, WSMsgType.BINARY, b'binary', False)]
parser.feed_data(b'')
res = out._buffer[0]
assert res == ((WSMsgType.BINARY, b'binary', ''), 6)
def test_fragmentation_header(out, parser) -> None:
data = build_frame(b'a', WSMsgType.TEXT)
parser._feed_data(data[:1])
parser._feed_data(data[1:])
res = out._buffer[0]
assert res == (WSMessage(WSMsgType.TEXT, 'a', ''), 1)
def test_continuation(out, parser) -> None:
data1 = build_frame(b'line1', WSMsgType.TEXT, is_fin=False)
parser._feed_data(data1)
data2 = build_frame(b'line2', WSMsgType.CONTINUATION)
parser._feed_data(data2)
res = out._buffer[0]
assert res == (WSMessage(WSMsgType.TEXT, 'line1line2', ''), 10)
def test_continuation_with_ping(out, parser) -> None:
parser.parse_frame = mock.Mock()
parser.parse_frame.return_value = [
(0, WSMsgType.TEXT, b'line1', False),
(0, WSMsgType.PING, b'', False),
(1, WSMsgType.CONTINUATION, b'line2', False),
]
data1 = build_frame(b'line1', WSMsgType.TEXT, is_fin=False)
parser._feed_data(data1)
data2 = build_frame(b'', WSMsgType.PING)
parser._feed_data(data2)
data3 = build_frame(b'line2', WSMsgType.CONTINUATION)
parser._feed_data(data3)
res = out._buffer[0]
assert res == (WSMessage(WSMsgType.PING, b'', ''), 0)
res = out._buffer[1]
assert res == (WSMessage(WSMsgType.TEXT, 'line1line2', ''), 10)
def test_continuation_err(out, parser) -> None:
parser.parse_frame = mock.Mock()
parser.parse_frame.return_value = [
(0, WSMsgType.TEXT, b'line1', False),
(1, WSMsgType.TEXT, b'line2', False)]
with pytest.raises(WebSocketError):
parser._feed_data(b'')
def test_continuation_with_close(out, parser) -> None:
parser.parse_frame = mock.Mock()
parser.parse_frame.return_value = [
(0, WSMsgType.TEXT, b'line1', False),
(0, WSMsgType.CLOSE,
build_close_frame(1002, b'test', noheader=True), False),
(1, WSMsgType.CONTINUATION, b'line2', False),
]
parser.feed_data(b'')
res = out._buffer[0]
assert res, (WSMessage(WSMsgType.CLOSE, 1002, 'test'), 0)
res = out._buffer[1]
assert res == (WSMessage(WSMsgType.TEXT, 'line1line2', ''), 10)
def test_continuation_with_close_unicode_err(out, parser) -> None:
parser.parse_frame = mock.Mock()
parser.parse_frame.return_value = [
(0, WSMsgType.TEXT, b'line1', False),
(0, WSMsgType.CLOSE,
build_close_frame(1000, b'\xf4\x90\x80\x80', noheader=True), False),
(1, WSMsgType.CONTINUATION, b'line2', False)]
with pytest.raises(WebSocketError) as ctx:
parser._feed_data(b'')
assert ctx.value.code == WSCloseCode.INVALID_TEXT
def test_continuation_with_close_bad_code(out, parser) -> None:
parser.parse_frame = mock.Mock()
parser.parse_frame.return_value = [
(0, WSMsgType.TEXT, b'line1', False),
(0, WSMsgType.CLOSE,
build_close_frame(1, b'test', noheader=True), False),
(1, WSMsgType.CONTINUATION, b'line2', False)]
with pytest.raises(WebSocketError) as ctx:
parser._feed_data(b'')
assert ctx.value.code == WSCloseCode.PROTOCOL_ERROR
def test_continuation_with_close_bad_payload(out, parser) -> None:
parser.parse_frame = mock.Mock()
parser.parse_frame.return_value = [
(0, WSMsgType.TEXT, b'line1', False),
(0, WSMsgType.CLOSE, b'1', False),
(1, WSMsgType.CONTINUATION, b'line2', False)]
with pytest.raises(WebSocketError) as ctx:
parser._feed_data(b'')
assert ctx.value.code, WSCloseCode.PROTOCOL_ERROR
def test_continuation_with_close_empty(out, parser) -> None:
parser.parse_frame = mock.Mock()
parser.parse_frame.return_value = [
(0, WSMsgType.TEXT, b'line1', False),
(0, WSMsgType.CLOSE, b'', False),
(1, WSMsgType.CONTINUATION, b'line2', False),
]
parser.feed_data(b'')
res = out._buffer[0]
assert res, (WSMessage(WSMsgType.CLOSE, 0, ''), 0)
res = out._buffer[1]
assert res == (WSMessage(WSMsgType.TEXT, 'line1line2', ''), 10)
websocket_mask_data = b'some very long data for masking by websocket'
websocket_mask_mask = b'1234'
websocket_mask_masked = (b'B]^Q\x11DVFH\x12_[_U\x13PPFR\x14W]A\x14\\S@_X'
b'\\T\x14SK\x13CTP@[RYV@')
def test_websocket_mask_python() -> None:
message = bytearray(websocket_mask_data)
http_websocket._websocket_mask_python(
websocket_mask_mask, message)
assert message == websocket_mask_masked
@pytest.mark.skipif(not hasattr(http_websocket, '_websocket_mask_cython'),
reason='Requires Cython')
def test_websocket_mask_cython() -> None:
message = bytearray(websocket_mask_data)
http_websocket._websocket_mask_cython(
websocket_mask_mask, message)
assert message == websocket_mask_masked
def test_websocket_mask_python_empty() -> None:
message = bytearray()
http_websocket._websocket_mask_python(
websocket_mask_mask, message)
assert message == bytearray()
@pytest.mark.skipif(not hasattr(http_websocket, '_websocket_mask_cython'),
reason='Requires Cython')
def test_websocket_mask_cython_empty() -> None:
message = bytearray()
http_websocket._websocket_mask_cython(
websocket_mask_mask, message)
assert message == bytearray()
def test_parse_compress_frame_single(parser) -> None:
parser.parse_frame(struct.pack('!BB', 0b11000001, 0b00000001))
res = parser.parse_frame(b'1')
fin, opcode, payload, compress = res[0]
assert (1, 1, b'1', True) == (fin, opcode, payload, not not compress)
def test_parse_compress_frame_multi(parser) -> None:
parser.parse_frame(struct.pack('!BB', 0b01000001, 126))
parser.parse_frame(struct.pack('!H', 4))
res = parser.parse_frame(b'1234')
fin, opcode, payload, compress = res[0]
assert (0, 1, b'1234', True) == (fin, opcode, payload, not not compress)
parser.parse_frame(struct.pack('!BB', 0b10000001, 126))
parser.parse_frame(struct.pack('!H', 4))
res = parser.parse_frame(b'1234')
fin, opcode, payload, compress = res[0]
assert (1, 1, b'1234', True) == (fin, opcode, payload, not not compress)
parser.parse_frame(struct.pack('!BB', 0b10000001, 126))
parser.parse_frame(struct.pack('!H', 4))
res = parser.parse_frame(b'1234')
fin, opcode, payload, compress = res[0]
assert (1, 1, b'1234', False) == (fin, opcode, payload, not not compress)
def test_parse_compress_error_frame(parser) -> None:
parser.parse_frame(struct.pack('!BB', 0b01000001, 0b00000001))
parser.parse_frame(b'1')
with pytest.raises(WebSocketError) as ctx:
parser.parse_frame(struct.pack('!BB', 0b11000001, 0b00000001))
parser.parse_frame(b'1')
assert ctx.value.code == WSCloseCode.PROTOCOL_ERROR
def test_parse_no_compress_frame_single() -> None:
parser_no_compress = WebSocketReader(out, 0, compress=False)
with pytest.raises(WebSocketError) as ctx:
parser_no_compress.parse_frame(struct.pack(
'!BB', 0b11000001, 0b00000001))
parser_no_compress.parse_frame(b'1')
assert ctx.value.code == WSCloseCode.PROTOCOL_ERROR
def test_msg_too_large(out) -> None:
parser = WebSocketReader(out, 256, compress=False)
data = build_frame(b'text'*256, WSMsgType.TEXT)
with pytest.raises(WebSocketError) as ctx:
parser._feed_data(data)
assert ctx.value.code == WSCloseCode.MESSAGE_TOO_BIG
def test_msg_too_large_not_fin(out) -> None:
parser = WebSocketReader(out, 256, compress=False)
data = build_frame(b'text'*256, WSMsgType.TEXT, is_fin=False)
with pytest.raises(WebSocketError) as ctx:
parser._feed_data(data)
assert ctx.value.code == WSCloseCode.MESSAGE_TOO_BIG
def test_compressed_msg_too_large(out) -> None:
parser = WebSocketReader(out, 256, compress=True)
data = build_frame(b'aaa'*256, WSMsgType.TEXT, compress=True)
with pytest.raises(WebSocketError) as ctx:
parser._feed_data(data)
assert ctx.value.code == WSCloseCode.MESSAGE_TOO_BIG