64 lines
2.0 KiB
Solidity
64 lines
2.0 KiB
Solidity
// SPDX-License-Identifier: GPL-2.0-or-later
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pragma solidity >=0.5.0;
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import '@openzeppelin/contracts/token/ERC20/IERC20.sol';
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import '@openzeppelin/contracts/drafts/IERC20Permit.sol';
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import '../interfaces/ISelfPermit.sol';
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import '../interfaces/external/IERC20PermitAllowed.sol';
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/// @title Self Permit
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/// @notice Functionality to call permit on any EIP-2612-compliant token for use in the route
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/// @dev These functions are expected to be embedded in multicalls to allow EOAs to approve a contract and call a function
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/// that requires an approval in a single transaction.
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abstract contract SelfPermit is ISelfPermit {
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/// @inheritdoc ISelfPermit
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function selfPermit(
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address token,
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uint256 value,
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uint256 deadline,
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uint8 v,
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bytes32 r,
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bytes32 s
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) public payable override {
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IERC20Permit(token).permit(msg.sender, address(this), value, deadline, v, r, s);
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}
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/// @inheritdoc ISelfPermit
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function selfPermitIfNecessary(
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address token,
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uint256 value,
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uint256 deadline,
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uint8 v,
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bytes32 r,
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bytes32 s
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) external payable override {
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if (IERC20(token).allowance(msg.sender, address(this)) < value) selfPermit(token, value, deadline, v, r, s);
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}
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/// @inheritdoc ISelfPermit
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function selfPermitAllowed(
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address token,
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uint256 nonce,
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uint256 expiry,
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uint8 v,
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bytes32 r,
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bytes32 s
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) public payable override {
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IERC20PermitAllowed(token).permit(msg.sender, address(this), nonce, expiry, true, v, r, s);
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}
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/// @inheritdoc ISelfPermit
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function selfPermitAllowedIfNecessary(
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address token,
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uint256 nonce,
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uint256 expiry,
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uint8 v,
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bytes32 r,
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bytes32 s
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) external payable override {
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if (IERC20(token).allowance(msg.sender, address(this)) < type(uint256).max)
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selfPermitAllowed(token, nonce, expiry, v, r, s);
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}
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}
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