web.py 文件源码

def create_signed_value(self, name, value, version=None):
        """Signs and timestamps a string so it cannot be forged.

        Normally used via set_secure_cookie, but provided as a separate
        method for non-cookie uses.  To decode a value not stored
        as a cookie use the optional value argument to get_secure_cookie.

        .. versionchanged:: 3.2.1

           Added the ``version`` argument.  Introduced cookie version 2
           and made it the default.
        """
        self.require_setting("cookie_secret", "secure cookies")
        secret = self.application.settings["cookie_secret"]
        key_version = None
        if isinstance(secret, dict):
            if self.application.settings.get("key_version") is None:
                raise Exception("key_version setting must be used for secret_key dicts")
            key_version = self.application.settings["key_version"]

        return create_signed_value(secret, name, value, version=version,
                                   key_version=key_version)