51 lines
1.7 KiB
Solidity
51 lines
1.7 KiB
Solidity
// SPDX-License-Identifier: MIT
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// OpenZeppelin Contracts (last updated v4.5.0-rc.0) (metatx/ERC2771Context.sol)
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pragma solidity ^0.8.9;
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import "../utils/ContextUpgradeable.sol";
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import "../proxy/utils/Initializable.sol";
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/**
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* @dev Context variant with ERC2771 support.
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*/
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abstract contract ERC2771ContextUpgradeable is Initializable, ContextUpgradeable {
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/// @custom:oz-upgrades-unsafe-allow state-variable-immutable
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address private immutable _trustedForwarder;
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/// @custom:oz-upgrades-unsafe-allow constructor
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constructor(address trustedForwarder) {
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_trustedForwarder = trustedForwarder;
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}
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function isTrustedForwarder(address forwarder) public view virtual returns (bool) {
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return forwarder == _trustedForwarder;
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}
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function _msgSender() internal view virtual override returns (address sender) {
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if (isTrustedForwarder(msg.sender)) {
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// The assembly code is more direct than the Solidity version using `abi.decode`.
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assembly {
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sender := shr(96, calldataload(sub(calldatasize(), 20)))
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}
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} else {
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return super._msgSender();
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}
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}
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function _msgData() internal view virtual override returns (bytes calldata) {
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if (isTrustedForwarder(msg.sender)) {
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return msg.data[:msg.data.length - 20];
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} else {
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return super._msgData();
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}
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}
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/**
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* This empty reserved space is put in place to allow future versions to add new
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* variables without shifting down storage in the inheritance chain.
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* See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
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*/
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uint256[50] private __gap;
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}
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