def unsign(self, token):
        """
        Extract the data from a signed ``token``.

        """
        if self.max_age is None:
            data = self.signer.unsign(token)
        else:
            data = self.signer.unsign(token, max_age=self.max_age)
        return signing.b64_decode(data.encode())
Extract the data from a signed ``token``.