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LibOptimism.sol
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LibOptimism.sol
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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;
import {ICrossDomainMessenger as Optimism_Bridge} from "../../vendor/optimism/ICrossDomainMessenger.sol";
import "../errors.sol";
/**
* @dev Primitives for cross-chain aware contracts for [Optimism](https://www.optimism.io/).
* See the [documentation](https://community.optimism.io/docs/developers/bridge/messaging/#accessing-msg-sender)
* for the functionality used here.
*/
library LibOptimism {
/**
* @dev Returns whether the current function call is the result of a
* cross-chain message relayed by `messenger`.
*/
function isCrossChain(address messenger) internal view returns (bool) {
return msg.sender == messenger;
}
/**
* @dev Returns the address of the sender that triggered the current
* cross-chain message through `messenger`.
*
* NOTE: {isCrossChain} should be checked before trying to recover the
* sender, as it will revert with `NotCrossChainCall` if the current
* function call is not the result of a cross-chain message.
*/
function crossChainSender(address messenger) internal view returns (address) {
if (!isCrossChain(messenger)) revert NotCrossChainCall();
return Optimism_Bridge(messenger).xDomainMessageSender();
}
}