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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 validate_signature(self, signature, data, encoding='utf8'):
 """Validate the signature for the provided data. Args: signature (str or bytes or bytearray):
 Signature that was provided for the request. data (str or bytes or bytearray):
 Data string to validate against the signature. encoding (str, optional):
 If a string was provided for ``data`` or ``signature``, this is the character encoding. Returns: bool: Whether the signature is valid for the provided data. """


        if isinstance(data, string_types):
            data = bytearray(data, encoding)
        if isinstance(signature, string_types):
            signature = bytearray(signature, encoding)

        secret_key = bytearray(self.secret_key, 'utf8')
        hashed = hmac.new(secret_key, data, sha1)
        encoded = b64encode(hashed.digest())

        return encoded.strip() == signature.strip()