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75 lines
2.9 KiB
75 lines
2.9 KiB
// SPDX-License-Identifier: MIT
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// OpenZeppelin Contracts (last updated v4.7.0) (metatx/ERC2771Context.sol)
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pragma solidity ^0.8.20;
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import {Context} from "../utils/Context.sol";
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/**
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* @dev Context variant with ERC2771 support.
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*
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* WARNING: Avoid using this pattern in contracts that rely in a specific calldata length as they'll
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* be affected by any forwarder whose `msg.data` is suffixed with the `from` address according to the ERC2771
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* specification adding the address size in bytes (20) to the calldata size. An example of an unexpected
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* behavior could be an unintended fallback (or another function) invocation while trying to invoke the `receive`
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* function only accessible if `msg.data.length == 0`.
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*/
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abstract contract ERC2771Context is Context {
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/// @custom:oz-upgrades-unsafe-allow state-variable-immutable
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address private immutable _trustedForwarder;
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/**
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* @dev Initializes the contract with a trusted forwarder, which will be able to
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* invoke functions on this contract on behalf of other accounts.
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*
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* NOTE: The trusted forwarder can be replaced by overriding {trustedForwarder}.
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*/
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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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/**
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* @dev Returns the address of the trusted forwarder.
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*/
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function trustedForwarder() public view virtual returns (address) {
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return _trustedForwarder;
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}
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/**
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* @dev Indicates whether any particular address is the trusted forwarder.
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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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/**
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* @dev Override for `msg.sender`. Defaults to the original `msg.sender` whenever
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* a call is not performed by the trusted forwarder or the calldata length is less than
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* 20 bytes (an address length).
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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) && msg.data.length >= 20) {
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// The assembly code is more direct than the Solidity version using `abi.decode`.
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/// @solidity memory-safe-assembly
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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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/**
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* @dev Override for `msg.data`. Defaults to the original `msg.data` whenever
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* a call is not performed by the trusted forwarder or the calldata length is less than
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* 20 bytes (an address length).
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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) && msg.data.length >= 20) {
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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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