/
ERC2771HandlerV2.sol
42 lines (35 loc) · 1.26 KB
/
ERC2771HandlerV2.sol
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// SPDX-License-Identifier: MIT
// solhint-disable-next-line compiler-version
pragma solidity 0.8.2;
/// @dev minimal ERC2771 handler to keep bytecode-size down
/// @dev no initializer version
contract ERC2771HandlerV2 {
address internal _trustedForwarder;
constructor(address forwarder) {
_trustedForwarder = forwarder;
}
function isTrustedForwarder(address forwarder) public view returns (bool) {
return forwarder == _trustedForwarder;
}
function getTrustedForwarder() external view returns (address trustedForwarder) {
return _trustedForwarder;
}
function _msgSender() internal view virtual returns (address sender) {
if (isTrustedForwarder(msg.sender)) {
// The assembly code is more direct than the Solidity version using `abi.decode`.
// solhint-disable-next-line no-inline-assembly
assembly {
sender := shr(96, calldataload(sub(calldatasize(), 20)))
}
} else {
return msg.sender;
}
}
function _msgData() internal view virtual returns (bytes calldata) {
if (isTrustedForwarder(msg.sender)) {
return msg.data[:msg.data.length - 20];
} else {
return msg.data;
}
}
}