// SPDX-License-Identifier: MIT

pragma solidity ^0.8.15;

import "@openzeppelin/contracts/utils/Context.sol";

import "./ERC2771ContextStorage.sol";

abstract contract ERC2771ContextInternal is Context {
    function _isTrustedForwarder(address operator) internal view returns (bool) {
        return ERC2771ContextStorage.layout().trustedForwarder == operator;
    }

    function _msgSender() internal view virtual override returns (address sender) {
        if (_isTrustedForwarder(msg.sender)) {
            // The assembly code is more direct than the Solidity version using `abi.decode`.
            /// @solidity memory-safe-assembly
            assembly {
                sender := shr(96, calldataload(sub(calldatasize(), 20)))
            }
        } else {
            return super._msgSender();
        }
    }

    function _msgData() internal view virtual override returns (bytes calldata) {
        if (_isTrustedForwarder(msg.sender)) {
            return msg.data[:msg.data.length - 20];
        } else {
            return super._msgData();
        }
    }
}