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ERC2771ContextUpgradeable.sol
67 lines (55 loc) · 2.14 KB
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ERC2771ContextUpgradeable.sol
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// SPDX-License-Identifier: Apache 2.0
pragma solidity ^0.8.0;
import "../../extension/interface/IERC2771Context.sol";
import "./Initializable.sol";
/**
* @dev Context variant with ERC2771 support.
*/
library ERC2771ContextStorage {
bytes32 public constant ERC2771_CONTEXT_STORAGE_POSITION = keccak256("erc2771.context.storage");
struct Data {
mapping(address => bool) trustedForwarder;
}
function erc2771ContextStorage() internal pure returns (Data storage erc2771ContextData) {
bytes32 position = ERC2771_CONTEXT_STORAGE_POSITION;
assembly {
erc2771ContextData.slot := position
}
}
}
/**
* @dev Context variant with ERC2771 support.
*/
abstract contract ERC2771ContextUpgradeable is Initializable {
function __ERC2771Context_init(address[] memory trustedForwarder) internal onlyInitializing {
__ERC2771Context_init_unchained(trustedForwarder);
}
function __ERC2771Context_init_unchained(address[] memory trustedForwarder) internal onlyInitializing {
ERC2771ContextStorage.Data storage data = ERC2771ContextStorage.erc2771ContextStorage();
for (uint256 i = 0; i < trustedForwarder.length; i++) {
data.trustedForwarder[trustedForwarder[i]] = true;
}
}
function isTrustedForwarder(address forwarder) public view virtual returns (bool) {
ERC2771ContextStorage.Data storage data = ERC2771ContextStorage.erc2771ContextStorage();
return data.trustedForwarder[forwarder];
}
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`.
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;
}
}
uint256[49] private __gap;
}