_handshake.py 文件源码

def _validate(headers, key, subprotocols):
    subproto = None
    for k, v in _HEADERS_TO_CHECK.items():
        r = headers.get(k, None)
        if not r:
            return False, None
        r = r.lower()
        if v != r:
            return False, None

    if subprotocols:
        subproto = headers.get("sec-websocket-protocol", None).lower()
        if not subproto or subproto not in [s.lower() for s in subprotocols]:
            error("Invalid subprotocol: " + str(subprotocols))
            return False, None

    result = headers.get("sec-websocket-accept", None)
    if not result:
        return False, None
    result = result.lower()

    if isinstance(result, six.text_type):
        result = result.encode('utf-8')

    value = (key + "258EAFA5-E914-47DA-95CA-C5AB0DC85B11").encode('utf-8')
    hashed = base64encode(hashlib.sha1(value).digest()).strip().lower()
    success = compare_digest(hashed, result)

    if success:
        return True, subproto
    else:
        return False, None