def decode(cls, data):
packed = messages.wrap(data)
if packed is None:
return None
# signature must be at the end
message_type = type(packed)
signature = message_type.fields_spec[-1]
assert signature.name == 'signature', 'signature is not the last field'
message_data = data[:-signature.size_bytes]
message_signature = data[-signature.size_bytes:]
message_hash = sha3(message_data)
data_that_was_signed = pack_signing_data(
message_type.get_bytes_from(data, 'nonce'),
message_type.get_bytes_from(data, 'transferred_amount'),
message_type.get_bytes_from(data, 'channel'),
message_type.get_bytes_from(data, 'locksroot'),
message_hash,
)
publickey = recover_publickey_safe(data_that_was_signed,
message_signature)
if publickey is None:
return None
message = cls.unpack(packed) # pylint: disable=no-member
message.sender = publickey_to_address(publickey)
return message
def decode(cls, data):
packed = messages.wrap(data)
if packed is None:
return
# signature must be at the end
message_type = type(packed)
signature = message_type.fields_spec[-1]
assert signature.name == 'signature', 'signature is not the last field'
data_that_was_signed = data[:-signature.size_bytes]
message_signature = data[-signature.size_bytes:]
publickey = recover_publickey_safe(data_that_was_signed, message_signature)
message = cls.unpack(packed) # pylint: disable=no-member
message.sender = publickey_to_address(publickey)
return message
