SelfPermit
Functionality to call permit on any EIP-2612-compliant token for use in the route
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.
Functions
selfPermit
function selfPermit(
address token,
uint256 value,
uint256 deadline,
uint8 v,
bytes32 r,
bytes32 s
) public
Permits this contract to spend a given token from msg.sender
The owner is always msg.sender and the spender is always address(this).
Parameters:
| Name | Type | Description |
|---|---|---|
token | address | The address of the token spent |
value | uint256 | The 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 |
selfPermitIfNecessary
function selfPermitIfNecessary(
address token,
uint256 value,
uint256 deadline,
uint8 v,
bytes32 r,
bytes32 s
) external
Permits this contract to spend a given token from msg.sender
The 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 | The address of the token spent |
value | uint256 | The 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
function selfPermitAllowed(
address token,
uint256 nonce,
uint256 expiry,
uint8 v,
bytes32 r,
bytes32 s
) public
Permits this contract to spend the sender's tokens for permit signatures that have the allowed parameter
The owner is always msg.sender and the spender is always address(this)
Parameters:
| Name | Type | Description |
|---|---|---|
token | address | The address of the token spent |
nonce | uint256 | The current nonce of the owner |
expiry | uint256 | The timestamp at which the permit is no longer valid |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
function selfPermitAllowedIfNecessary(
address token,
uint256 nonce,
uint256 expiry,
uint8 v,
bytes32 r,
bytes32 s
) external
Permits this contract to spend the sender's tokens for permit signatures that have the allowed parameter
The 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 | The address of the token spent |
nonce | uint256 | The current nonce of the owner |
expiry | uint256 | The 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 |