95 lines
2.6 KiB
Solidity
95 lines
2.6 KiB
Solidity
// SPDX-License-Identifier: MIT
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pragma solidity >=0.8.4;
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/// @author OpenZeppelin Contracts v4.4.1 (utils/Context.sol)
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/// (https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/utils/Context.sol)
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/// @dev Provides information about the current execution context, including the
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/// sender of the transaction and its data. While these are generally available
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/// via msg.sender and msg.data, they should not be accessed in such a direct
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/// manner, since when dealing with meta-transactions the account sending and
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/// paying for execution may not be the actual sender (as far as an application
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/// is concerned).
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///
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/// This contract is only required for intermediate, library-like contracts.
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abstract contract Context {
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function _msgSender()
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internal
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view
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virtual
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returns (address)
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{
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return msg.sender;
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}
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function _msgData()
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internal
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view
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virtual
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returns (bytes calldata)
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{
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return msg.data;
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}
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}
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/// @author Modified from OpenZeppelin Contracts (last updated v4.7.0) (metatx/ERC2771Context.sol)
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/// https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/metatx/ERC2771Context.sol
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/// @dev Context variant with ERC2771 support.
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abstract contract ERC2771Context is Context {
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// address private immutable _trustedForwarder;
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mapping(address => bool) public isTrustedForwarder;
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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 _msgSender()
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internal
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view
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virtual
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override
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returns (address sender)
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{
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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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/// @solidity memory-safe-assembly
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assembly {
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sender := shr(
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96,
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calldataload(sub(calldatasize(), 20))
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)
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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 _isTrustedForwarder()
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internal
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view
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returns (address _sender, uint256 _forwarder)
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{
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_sender = _msgSender();
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_forwarder = (_sender != msg.sender)
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? uint256(1)
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: uint256(0);
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}
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function _msgData()
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internal
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view
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virtual
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override
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returns (bytes calldata)
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{
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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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