def fromMessage(klass, message, op_endpoint=UNUSED):
        if message.isOpenID1():
            session_type = message.getArg(OPENID1_NS, 'session_type')
            if session_type == 'no-encryption':
                oidutil.log('Received OpenID 1 request with a no-encryption '
                            'assocaition session type. Continuing anyway.')
            elif not session_type:
                session_type = 'no-encryption'
        else:
            session_type = message.getArg(OPENID2_NS, 'session_type')
            if session_type is None:
                raise ProtocolError(message,
                                    text="session_type missing from request")

        try:
            session_class = klass.session_classes[session_type]
        except KeyError:
            raise ProtocolError(message,
                                "Unknown session type %r" % (session_type,))

        try:
            session = session_class.fromMessage(message)
        except ValueError, why:
            raise ProtocolError(message, 'Error parsing %s session: %s' %
                                (session_class.session_type, why[0]))

        assoc_type = message.getArg(OPENID_NS, 'assoc_type', 'HMAC-SHA1')
        if assoc_type not in session.allowed_assoc_types:
            fmt = 'Session type %s does not support association type %s'
            raise ProtocolError(message, fmt % (session_type, assoc_type))

        self = klass(session, assoc_type)
        self.message = message
        self.namespace = message.getOpenIDNamespace()
        return self
Construct me from an OpenID Message.
dataset/ETHPy150Open CollabQ/CollabQ/openid/server/server.py/AssociateRequest.fromMessage