def test_length_126_no_trailing(self):
"""
Reading a header with a length of 126 that is missing the 2 trailing
bytes should result in a WebSocketError.
"""
data = StringIO('\x00\x7e')
with self.assertRaises(exc.WebSocketError) as ctx:
hybi.decode_header(data)
self.assertEqual(
'Unexpected EOF while decoding header',
unicode(ctx.exception)
)
def test_control_frame_size(self):
"""
Page 37 of the spec specifies that control frames must not have a
length of greater that 125.
"""
byte = chr(hybi.FIN_MASK | hybi.OPCODE_CLOSE) + chr(0x7f)
with self.assertRaises(exc.FrameTooLargeException) as ctx:
hybi.decode_header(StringIO(byte))
self.assertEqual(
u"Control frame cannot be larger than 125 bytes: '\\x88\\x7f'",
unicode(ctx.exception)
)
def test_control_frame_fragmentation(self):
"""
Page 36 of the spec specifies that control frames must not be
fragmented
"""
byte = chr(hybi.OPCODE_CLOSE)
with self.assertRaises(exc.ProtocolError) as ctx:
hybi.decode_header(StringIO(byte + 'a'))
self.assertEqual(
u"Received fragmented control frame: '\\x08a'",
unicode(ctx.exception)
)
def test_length_127_no_trailing(self):
"""
A header with base length 127 should read another 8 bytes of trailing
data.
"""
for i in xrange(0, 8):
data = StringIO('\x00\x7f' + ('\x00' * i))
with self.assertRaises(exc.WebSocketError) as ctx:
hybi.decode_header(data)
self.assertEqual(
'Unexpected EOF while decoding header',
unicode(ctx.exception)
)
def test_bad_length(self):
"""
`exc.WebSocketError` must be raised if the number of bytes supplied < 2
"""
for data in ('', '\x00'):
# skip 2 bytes
stream = StringIO(data)
with self.assertRaises(exc.WebSocketError) as ctx:
hybi.decode_header(stream)
self.assertEqual(
u'Unexpected EOF while decoding header',
unicode(ctx.exception)
)
def test_missing_mask(self):
"""
Ensure that the 8 byte header is unsigned
"""
# check the mask
data = StringIO(
chr(hybi.FIN_MASK | hybi.OPCODE_CLOSE) + chr(hybi.MASK_MASK) +
'abc' # this is the mask data
)
with self.assertRaises(exc.WebSocketError) as ctx:
hybi.decode_header(data)
self.assertEqual(
'Unexpected EOF while decoding header',
unicode(ctx.exception)
)
def test_rsv_bits(self):
"""
If the RSV bits are set then raise a `ProtocolError`
"""
for rsv_mask in [0x40, 0x20, 0x10]:
byte = chr(rsv_mask)
header = hybi.decode_header(StringIO(byte + '\x00'))
self.assertEqual(header.flags, rsv_mask)
def test_length_127_unsigned(self):
"""
Ensure that the 8 byte header is unsigned
"""
data = StringIO('\x00\x7f' + ('\xff' * 8))
header = hybi.decode_header(data)
self.assertFalse(header.fin)
self.assertEqual(header.opcode, 0x00)
self.assertEqual(header.mask, '')
self.assertEqual(header.length, 0xffffffffffffffff)
self.assertEqual(header.flags, 0)
def test_length_127_actual(self):
"""
8 bytes should be decoded when reading a 127 base length header
"""
data = StringIO('\x00\x7f' + ('\x00' * 8))
header = hybi.decode_header(data)
self.assertFalse(header.fin)
self.assertEqual(header.opcode, 0x00)
self.assertEqual(header.mask, '')
self.assertEqual(header.length, 0)
self.assertEqual(header.flags, 0)
def test_length_126_actual(self):
"""
The correct length should be decoded when reading a 126 length header.
"""
data = StringIO('\x00\x7e\x00\x00')
header = hybi.decode_header(data)
self.assertFalse(header.fin)
self.assertEqual(header.opcode, 0x00)
self.assertEqual(header.mask, '')
self.assertEqual(header.length, 0)
self.assertEqual(header.flags, 0)
def test_decode(self):
"""
Basic sanity checks for decoding a header.
"""
header = hybi.decode_header(StringIO(
chr(hybi.FIN_MASK | hybi.OPCODE_CLOSE) + '\x00'
))
# fin, opcode, mask, length
self.assertTrue(header.fin)
self.assertEqual(header.opcode, 0x08)
self.assertEqual(header.mask, '')
self.assertEqual(header.length, 0)
self.assertEqual(header.flags, 0)
# check the length
header = hybi.decode_header(StringIO(
chr(hybi.FIN_MASK | hybi.OPCODE_CLOSE) + '\x10'
))
self.assertTrue(header.fin)
self.assertEqual(header.opcode, 0x08)
self.assertEqual(header.mask, '')
# this is changed ..
self.assertEqual(header.length, 16)
self.assertEqual(header.flags, 0)
# check the mask
data = StringIO(
chr(hybi.FIN_MASK | hybi.OPCODE_CLOSE) + chr(hybi.MASK_MASK) +
'abcd' # this is the mask data
)
header = hybi.decode_header(data)
self.assertTrue(header.fin)
self.assertEqual(header.opcode, 0x08)
self.assertEqual(header.mask, 'abcd')
self.assertEqual(header.length, 0)
self.assertEqual(header.flags, 0)
