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from ._eip712_base import sign, recover, is_address, is_signature, is_eth_privkey, is_bytes16, \
is_block_number, is_chain_id
[docs]def _create_eip712_channel_close(chainId: int, verifyingContract: bytes, closeAt: int, marketId: bytes, channelId: bytes,
channelSeq: int, balance: int, isFinal: bool) -> dict:
"""
:param chainId:
:param verifyingContract:
:param marketId:
:param channelId:
:param channelSeq:
:param balance:
:param isFinal:
:return:
"""
assert is_chain_id(chainId)
assert is_address(verifyingContract)
assert is_block_number(closeAt)
assert is_bytes16(marketId)
assert is_bytes16(channelId)
assert type(channelSeq) == int
assert type(balance) == int
assert type(isFinal) == bool
data = {
'types': {
'EIP712Domain': [
{
'name': 'name',
'type': 'string'
},
{
'name': 'version',
'type': 'string'
},
],
'EIP712ChannelClose': [{
'name': 'chainId',
'type': 'uint256'
}, {
'name': 'verifyingContract',
'type': 'address'
}, {
'name': 'closeAt',
'type': 'uint256'
}, {
'name': 'marketId',
'type': 'bytes16'
}, {
'name': 'channelId',
'type': 'bytes16'
}, {
'name': 'channelSeq',
'type': 'uint32'
}, {
'name': 'balance',
'type': 'uint256'
}, {
'name': 'isFinal',
'type': 'bool'
}]
},
'primaryType': 'EIP712ChannelClose',
'domain': {
'name': 'XBR',
'version': '1',
},
'message': {
'chainId': chainId,
'verifyingContract': verifyingContract,
'closeAt': closeAt,
'marketId': marketId,
'channelId': channelId,
'channelSeq': channelSeq,
'balance': balance,
'isFinal': isFinal
}
}
return data
[docs]def sign_eip712_channel_close(eth_privkey: bytes, chainId: int, verifyingContract: bytes, closeAt: int, marketId: bytes,
channelId: bytes, channelSeq: int, balance: int, isFinal: bool) -> bytes:
"""
:param eth_privkey: Ethereum address of buyer (a raw 20 bytes Ethereum address).
:type eth_privkey: bytes
:return: The signature according to EIP712 (32+32+1 raw bytes).
:rtype: bytes
"""
assert is_eth_privkey(eth_privkey)
data = _create_eip712_channel_close(chainId, verifyingContract, closeAt, marketId, channelId, channelSeq, balance,
isFinal)
return sign(eth_privkey, data)
[docs]def recover_eip712_channel_close(chainId: int, verifyingContract: bytes, closeAt: int, marketId: bytes, channelId: bytes,
channelSeq: int, balance: int, isFinal: bool, signature: bytes) -> bytes:
"""
Recover the signer address the given EIP712 signature was signed with.
:return: The (computed) signer address the signature was signed with.
:rtype: bytes
"""
assert is_signature(signature)
data = _create_eip712_channel_close(chainId, verifyingContract, closeAt, marketId, channelId, channelSeq, balance,
isFinal)
return recover(data, signature)