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46 lines
1.7 KiB
Solidity
46 lines
1.7 KiB
Solidity
1 year ago
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// SPDX-License-Identifier: MIT
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// OpenZeppelin Contracts (last updated v4.8.0) (crosschain/arbitrum/LibArbitrumL2.sol)
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pragma solidity ^0.8.4;
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import {IArbSys as ArbitrumL2_Bridge} from "../../vendor/arbitrum/IArbSys.sol";
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import "../errors.sol";
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/**
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* @dev Primitives for cross-chain aware contracts for
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* https://arbitrum.io/[Arbitrum].
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*
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* This version should only be used on L2 to process cross-chain messages
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* originating from L1. For the other side, use {LibArbitrumL1}.
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*
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* WARNING: There is currently a bug in Arbitrum that causes this contract to
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* fail to detect cross-chain calls when deployed behind a proxy. This will be
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* fixed when the network is upgraded to Arbitrum Nitro, currently scheduled for
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* August 31st 2022.
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*/
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library LibArbitrumL2 {
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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 `arbsys`.
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*/
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address public constant ARBSYS = 0x0000000000000000000000000000000000000064;
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function isCrossChain(address arbsys) internal view returns (bool) {
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return ArbitrumL2_Bridge(arbsys).wasMyCallersAddressAliased();
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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 `arbsys`.
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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 arbsys) internal view returns (address) {
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if (!isCrossChain(arbsys)) revert NotCrossChainCall();
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return ArbitrumL2_Bridge(arbsys).myCallersAddressWithoutAliasing();
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}
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}
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