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import contextlib
import unittest
from websockets.datastructures import Headers
from websockets.exceptions import (
InvalidHandshake,
InvalidHeader,
InvalidHeaderValue,
InvalidUpgrade,
)
from websockets.legacy.handshake import *
from websockets.utils import accept_key
class HandshakeTests(unittest.TestCase):
def test_round_trip(self):
request_headers = Headers()
request_key = build_request(request_headers)
response_key = check_request(request_headers)
self.assertEqual(request_key, response_key)
response_headers = Headers()
build_response(response_headers, response_key)
check_response(response_headers, request_key)
@contextlib.contextmanager
def assertValidRequestHeaders(self):
"""
Provide request headers for modification.
Assert that the transformation kept them valid.
"""
headers = Headers()
build_request(headers)
yield headers
check_request(headers)
@contextlib.contextmanager
def assertInvalidRequestHeaders(self, exc_type):
"""
Provide request headers for modification.
Assert that the transformation made them invalid.
"""
headers = Headers()
build_request(headers)
yield headers
assert issubclass(exc_type, InvalidHandshake)
with self.assertRaises(exc_type):
check_request(headers)
def test_request_invalid_connection(self):
with self.assertInvalidRequestHeaders(InvalidUpgrade) as headers:
del headers["Connection"]
headers["Connection"] = "Downgrade"
def test_request_missing_connection(self):
with self.assertInvalidRequestHeaders(InvalidUpgrade) as headers:
del headers["Connection"]
def test_request_additional_connection(self):
with self.assertValidRequestHeaders() as headers:
headers["Connection"] = "close"
def test_request_invalid_upgrade(self):
with self.assertInvalidRequestHeaders(InvalidUpgrade) as headers:
del headers["Upgrade"]
headers["Upgrade"] = "socketweb"
def test_request_missing_upgrade(self):
with self.assertInvalidRequestHeaders(InvalidUpgrade) as headers:
del headers["Upgrade"]
def test_request_additional_upgrade(self):
with self.assertInvalidRequestHeaders(InvalidUpgrade) as headers:
headers["Upgrade"] = "socketweb"
def test_request_invalid_key_not_base64(self):
with self.assertInvalidRequestHeaders(InvalidHeaderValue) as headers:
del headers["Sec-WebSocket-Key"]
headers["Sec-WebSocket-Key"] = "!@#$%^&*()"
def test_request_invalid_key_not_well_padded(self):
with self.assertInvalidRequestHeaders(InvalidHeaderValue) as headers:
del headers["Sec-WebSocket-Key"]
headers["Sec-WebSocket-Key"] = "CSIRmL8dWYxeAdr/XpEHRw"
def test_request_invalid_key_not_16_bytes_long(self):
with self.assertInvalidRequestHeaders(InvalidHeaderValue) as headers:
del headers["Sec-WebSocket-Key"]
headers["Sec-WebSocket-Key"] = "ZLpprpvK4PE="
def test_request_missing_key(self):
with self.assertInvalidRequestHeaders(InvalidHeader) as headers:
del headers["Sec-WebSocket-Key"]
def test_request_additional_key(self):
with self.assertInvalidRequestHeaders(InvalidHeader) as headers:
# This duplicates the Sec-WebSocket-Key header.
headers["Sec-WebSocket-Key"] = headers["Sec-WebSocket-Key"]
def test_request_invalid_version(self):
with self.assertInvalidRequestHeaders(InvalidHeaderValue) as headers:
del headers["Sec-WebSocket-Version"]
headers["Sec-WebSocket-Version"] = "42"
def test_request_missing_version(self):
with self.assertInvalidRequestHeaders(InvalidHeader) as headers:
del headers["Sec-WebSocket-Version"]
def test_request_additional_version(self):
with self.assertInvalidRequestHeaders(InvalidHeader) as headers:
# This duplicates the Sec-WebSocket-Version header.
headers["Sec-WebSocket-Version"] = headers["Sec-WebSocket-Version"]
@contextlib.contextmanager
def assertValidResponseHeaders(self, key="CSIRmL8dWYxeAdr/XpEHRw=="):
"""
Provide response headers for modification.
Assert that the transformation kept them valid.
"""
headers = Headers()
build_response(headers, key)
yield headers
check_response(headers, key)
@contextlib.contextmanager
def assertInvalidResponseHeaders(self, exc_type, key="CSIRmL8dWYxeAdr/XpEHRw=="):
"""
Provide response headers for modification.
Assert that the transformation made them invalid.
"""
headers = Headers()
build_response(headers, key)
yield headers
assert issubclass(exc_type, InvalidHandshake)
with self.assertRaises(exc_type):
check_response(headers, key)
def test_response_invalid_connection(self):
with self.assertInvalidResponseHeaders(InvalidUpgrade) as headers:
del headers["Connection"]
headers["Connection"] = "Downgrade"
def test_response_missing_connection(self):
with self.assertInvalidResponseHeaders(InvalidUpgrade) as headers:
del headers["Connection"]
def test_response_additional_connection(self):
with self.assertValidResponseHeaders() as headers:
headers["Connection"] = "close"
def test_response_invalid_upgrade(self):
with self.assertInvalidResponseHeaders(InvalidUpgrade) as headers:
del headers["Upgrade"]
headers["Upgrade"] = "socketweb"
def test_response_missing_upgrade(self):
with self.assertInvalidResponseHeaders(InvalidUpgrade) as headers:
del headers["Upgrade"]
def test_response_additional_upgrade(self):
with self.assertInvalidResponseHeaders(InvalidUpgrade) as headers:
headers["Upgrade"] = "socketweb"
def test_response_invalid_accept(self):
with self.assertInvalidResponseHeaders(InvalidHeaderValue) as headers:
del headers["Sec-WebSocket-Accept"]
other_key = "1Eq4UDEFQYg3YspNgqxv5g=="
headers["Sec-WebSocket-Accept"] = accept_key(other_key)
def test_response_missing_accept(self):
with self.assertInvalidResponseHeaders(InvalidHeader) as headers:
del headers["Sec-WebSocket-Accept"]
def test_response_additional_accept(self):
with self.assertInvalidResponseHeaders(InvalidHeader) as headers:
# This duplicates the Sec-WebSocket-Accept header.
headers["Sec-WebSocket-Accept"] = headers["Sec-WebSocket-Accept"]
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