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37 lines
1.4 KiB
Solidity
37 lines
1.4 KiB
Solidity
// SPDX-License-Identifier: MIT
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// OpenZeppelin Contracts (last updated v4.7.0) (crosschain/optimism/LibOptimism.sol)
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pragma solidity ^0.8.4;
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import {ICrossDomainMessenger as Optimism_Bridge} from "../../vendor/optimism/ICrossDomainMessenger.sol";
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import "../errors.sol";
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/**
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* @dev Primitives for cross-chain aware contracts for https://www.optimism.io/[Optimism].
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* See the https://community.optimism.io/docs/developers/bridge/messaging/#accessing-msg-sender[documentation]
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* for the functionality used here.
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*/
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library LibOptimism {
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/**
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* @dev Returns whether the current function call is the result of a
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* cross-chain message relayed by `messenger`.
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*/
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function isCrossChain(address messenger) internal view returns (bool) {
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return msg.sender == messenger;
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}
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/**
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* @dev Returns the address of the sender that triggered the current
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* cross-chain message through `messenger`.
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*
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* NOTE: {isCrossChain} should be checked before trying to recover the
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* sender, as it will revert with `NotCrossChainCall` if the current
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* function call is not the result of a cross-chain message.
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*/
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function crossChainSender(address messenger) internal view returns (address) {
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if (!isCrossChain(messenger)) revert NotCrossChainCall();
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return Optimism_Bridge(messenger).xDomainMessageSender();
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}
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}
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