feat: add permit

contracts/contracts-upgradable/token/oft/v2/fee/OFTWithFeePermitUpgradeable.sol

@@ -0,0 +1,81 @@
+// SPDX-License-Identifier: MIT
+
+pragma solidity ^0.8.0;
+
+import "hardhat-deploy/solc_0.8/proxy/Proxied.sol";
+import "@openzeppelin/contracts-upgradeable/token/ERC20/ERC20Upgradeable.sol";
+import "@openzeppelin/contracts-upgradeable/token/ERC20/extensions/ERC20PermitUpgradeable.sol";
+import "./BaseOFTWithFeeUpgradeable.sol";
+
+contract OFTWithFeePermitUpgradeable is Initializable, BaseOFTWithFeeUpgradeable, ERC20Upgradeable, Proxied, ERC20PermitUpgradeable {
+    uint internal ld2sdRate;
+
+    /// @custom:oz-upgrades-unsafe-allow constructor
+    constructor() {
+        _disableInitializers();
+    }
+
+    function initialize(string memory _name, string memory _symbol, uint8 _sharedDecimals, address _lzEndpoint) public virtual initializer {
+        __OFTWithFeeUpgradeable_init(_name, _symbol, _sharedDecimals, _lzEndpoint);
+    }
+
+    function __OFTWithFeeUpgradeable_init(
+        string memory _name,
+        string memory _symbol,
+        uint8 _sharedDecimals,
+        address _lzEndpoint
+    ) internal onlyInitializing {
+        __Ownable_init_unchained();
+        __LzAppUpgradeable_init_unchained(_lzEndpoint);
+        __OFTCoreV2Upgradeable_init_unchained(_sharedDecimals);
+
+        __ERC20_init_unchained(_name, _symbol);
+        __ERC20Permit_init(_name);
+
+        __OFTWithFeeUpgradeable_init_unchained(_sharedDecimals);
+    }
+
+    function __OFTWithFeeUpgradeable_init_unchained(uint8 _sharedDecimals) internal onlyInitializing {
+        uint8 decimals = decimals();
+        require(_sharedDecimals <= decimals, "OFTWithFee: sharedDecimals must be <= decimals");
+        ld2sdRate = 10 ** (decimals - _sharedDecimals);
+    }
+
+    /************************************************************************
+     * public functions
+     ************************************************************************/
+    function circulatingSupply() public view virtual override returns (uint) {
+        return totalSupply();
+    }
+
+    function token() public view virtual override returns (address) {
+        return address(this);
+    }
+
+    /************************************************************************
+     * internal functions
+     ************************************************************************/
+    function _debitFrom(address _from, uint16, bytes32, uint _amount) internal virtual override returns (uint) {
+        address spender = _msgSender();
+        if (_from != spender) _spendAllowance(_from, spender, _amount);
+        _burn(_from, _amount);
+        return _amount;
+    }
+
+    function _creditTo(uint16, address _toAddress, uint _amount) internal virtual override returns (uint) {
+        _mint(_toAddress, _amount);
+        return _amount;
+    }
+
+    function _transferFrom(address _from, address _to, uint _amount) internal virtual override returns (uint) {
+        address spender = _msgSender();
+        // if transfer from this contract, no need to check allowance
+        if (_from != address(this) && _from != spender) _spendAllowance(_from, spender, _amount);
+        _transfer(_from, _to, _amount);
+        return _amount;
+    }
+
+    function _ld2sdRate() internal view virtual override returns (uint) {
+        return ld2sdRate;
+    }
+}