mirror of
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90 lines
2.4 KiB
Python
90 lines
2.4 KiB
Python
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"""
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Collection of WebSockets Protocol utility functions (RFC6455)
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Spec: https://tools.ietf.org/html/rfc6455
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"""
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import base64
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import hashlib
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import os
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from netlib import http, strutils
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MAGIC = b'258EAFA5-E914-47DA-95CA-C5AB0DC85B11'
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VERSION = "13"
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def client_handshake_headers(version=None, key=None, protocol=None, extensions=None):
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"""
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Create the headers for a valid HTTP upgrade request. If Key is not
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specified, it is generated, and can be found in sec-websocket-key in
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the returned header set.
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Returns an instance of http.Headers
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"""
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if version is None:
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version = VERSION
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if key is None:
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key = base64.b64encode(os.urandom(16)).decode('ascii')
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h = http.Headers(
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connection="upgrade",
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upgrade="websocket",
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sec_websocket_version=version,
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sec_websocket_key=key,
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)
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if protocol is not None:
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h['sec-websocket-protocol'] = protocol
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if extensions is not None:
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h['sec-websocket-extensions'] = extensions
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return h
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def server_handshake_headers(client_key, protocol=None, extensions=None):
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"""
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The server response is a valid HTTP 101 response.
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Returns an instance of http.Headers
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"""
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h = http.Headers(
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connection="upgrade",
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upgrade="websocket",
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sec_websocket_accept=create_server_nonce(client_key),
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)
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if protocol is not None:
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h['sec-websocket-protocol'] = protocol
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if extensions is not None:
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h['sec-websocket-extensions'] = extensions
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return h
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def check_handshake(headers):
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return (
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"upgrade" in headers.get("connection", "").lower() and
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headers.get("upgrade", "").lower() == "websocket" and
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(headers.get("sec-websocket-key") is not None or headers.get("sec-websocket-accept") is not None)
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)
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def create_server_nonce(client_nonce):
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return base64.b64encode(hashlib.sha1(strutils.always_bytes(client_nonce) + MAGIC).digest())
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def check_client_version(headers):
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return headers.get("sec-websocket-version", "") == VERSION
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def get_extensions(headers):
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return headers.get("sec-websocket-extensions", None)
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def get_protocol(headers):
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return headers.get("sec-websocket-protocol", None)
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def get_client_key(headers):
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return headers.get("sec-websocket-key", None)
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def get_server_accept(headers):
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return headers.get("sec-websocket-accept", None)
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