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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 _decode_token(cls, token):
 """ Permission information is encoded in an authorization token. """

        missing_padding = len(token) % 4
        if missing_padding != 0:
            token += '=' * (4 - missing_padding)
        return json.loads(base64.b64decode(token).decode('utf-8'))