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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def encode_token(self, token):
 """Encode Authorization token, return bytes token"""

        key = current_app.secret_key
        if key is None:
            raise RuntimeError(
                "please set app.secret_key before generate token")
        return jwt.encode(token, key, algorithm=self.config["algorithm"])