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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_open(chainId: int, verifyingContract: bytes, ctype: int, openedAt: int,
marketId: bytes, channelId: bytes, actor: bytes, delegate: bytes,
marketmaker: bytes, recipient: bytes, amount: int) -> dict:
"""
:param chainId:
:param verifyingContract:
:param ctype:
:param openedAt:
:param marketId:
:param channelId:
:param actor:
:param delegate:
:param marketmaker:
:param recipient:
:param amount:
:return:
"""
assert is_chain_id(chainId)
assert is_address(verifyingContract)
assert type(ctype) == int
assert is_block_number(openedAt)
assert is_bytes16(marketId)
assert is_bytes16(channelId)
assert is_address(actor)
assert is_address(delegate)
assert is_address(marketmaker)
assert is_address(recipient)
assert type(amount) == int
data = {
'types': {
'EIP712Domain': [
{
'name': 'name',
'type': 'string'
},
{
'name': 'version',
'type': 'string'
},
],
'EIP712ChannelOpen': [{
'name': 'chainId',
'type': 'uint256'
}, {
'name': 'verifyingContract',
'type': 'address'
}, {
'name': 'ctype',
'type': 'uint8'
}, {
'name': 'openedAt',
'type': 'uint256'
}, {
'name': 'marketId',
'type': 'bytes16'
}, {
'name': 'channelId',
'type': 'bytes16'
}, {
'name': 'actor',
'type': 'address'
}, {
'name': 'delegate',
'type': 'address'
}, {
'name': 'marketmaker',
'type': 'address'
}, {
'name': 'recipient',
'type': 'address'
}, {
'name': 'amount',
'type': 'uint256'
}]
},
'primaryType': 'EIP712ChannelOpen',
'domain': {
'name': 'XBR',
'version': '1',
},
'message': {
'chainId': chainId,
'verifyingContract': verifyingContract,
'ctype': ctype,
'openedAt': openedAt,
'marketId': marketId,
'channelId': channelId,
'actor': actor,
'delegate': delegate,
'marketmaker': marketmaker,
'recipient': recipient,
'amount': amount
}
}
return data
[docs]def sign_eip712_channel_open(eth_privkey: bytes, chainId: int, verifyingContract: bytes, ctype: int,
openedAt: int, marketId: bytes, channelId: bytes, actor: bytes, delegate: bytes,
marketmaker: bytes, recipient: bytes, amount: int) -> 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_open(chainId, verifyingContract, ctype, openedAt, marketId, channelId,
actor, delegate, marketmaker, recipient, amount)
return sign(eth_privkey, data)
[docs]def recover_eip712_channel_open(chainId: int, verifyingContract: bytes, ctype: int, openedAt: int,
marketId: bytes, channelId: bytes, actor: bytes, delegate: bytes,
marketmaker: bytes, recipient: bytes, amount: int, 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_open(chainId, verifyingContract, ctype, openedAt, marketId, channelId,
actor, delegate, marketmaker, recipient, amount)
return recover(data, signature)