SelfPermit.sol
Functionality to call permit on any EIP-2612-compliant token
Details
These functions are expected to be embedded in multicalls to allow EOAs to approve a contract and call a function that requires an approval in a single transaction
Methods
selfPermit
Permits this contract to spend a given token from msg.sender
function selfPermit(address token, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) external payable
Details
owner is always msg.sender and the spender is always address(this)
Parameters
| Name | Type | Description |
|---|---|---|
| token | address | Address of the token spent |
| value | uint256 | Amount that can be spent of token |
| deadline | uint256 | A timestamp, the current blocktime must be less than or equal to this timestamp |
| v | uint8 | Must produce valid secp256k1 signature from the holder along with r and s |
| r | bytes32 | Must produce valid secp256k1 signature from the holder along with v and s |
| s | bytes32 | Must produce valid secp256k1 signature from the holder along with r and v |
selfPermitAllowed
Permits this contract to spend the sender's tokens for permit signatures that have the allowed parameter
function selfPermitAllowed(address token, uint256 nonce, uint256 expiry, uint8 v, bytes32 r, bytes32 s) external payable
Details
owner is always msg.sender and the spender is always address(this)
Parameters
| Name | Type | Description |
|---|---|---|
| token | address | Address of the token spent |
| nonce | uint256 | Current nonce of the owner |
| expiry | uint256 | Timestamp at which the permit is no longer valid |
| v | uint8 | Must produce valid secp256k1 signature from the holder along with r and s |
| r | bytes32 | Must produce valid secp256k1 signature from the holder along with v and s |
| s | bytes32 | Must produce valid secp256k1 signature from the holder along with r and v |
selfPermitAllowedIfNecessary
Permits this contract to spend the sender's tokens for permit signatures that have the allowed parameter
function selfPermitAllowedIfNecessary(address token, uint256 nonce, uint256 expiry, uint8 v, bytes32 r, bytes32 s) external payable
Details
owner is always msg.sender and the spender is always address(this) Can be used instead of #selfPermitAllowed to prevent calls from failing due to a frontrun of a call to #selfPermitAllowed
Parameters
| Name | Type | Description |
|---|---|---|
| token | address | Address of the token spent |
| nonce | uint256 | Current nonce of the owner |
| expiry | uint256 | Timestamp at which the permit is no longer valid |
| v | uint8 | Must produce valid secp256k1 signature from the holder along with r and s |
| r | bytes32 | Must produce valid secp256k1 signature from the holder along with v and s |
| s | bytes32 | Must produce valid secp256k1 signature from the holder along with r and v |
selfPermitIfNecessary
Permits this contract to spend a given token from msg.sender
function selfPermitIfNecessary(address token, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) external payable
Details
owner is always msg.sender and the spender is always address(this) Can be used instead of #selfPermit to prevent calls from failing due to a frontrun of a call to #selfPermit
Parameters
| Name | Type | Description |
|---|---|---|
| token | address | Address of the token spent |
| value | uint256 | Amount that can be spent of token |
| deadline | uint256 | A timestamp, the current blocktime must be less than or equal to this timestamp |
| v | uint8 | Must produce valid secp256k1 signature from the holder along with r and s |
| r | bytes32 | Must produce valid secp256k1 signature from the holder along with v and s |
| s | bytes32 | Must produce valid secp256k1 signature from the holder along with r and v |