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43 lines
1.5 KiB
Solidity
43 lines
1.5 KiB
Solidity
// SPDX-License-Identifier: MIT
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// OpenZeppelin Contracts (last updated v4.8.0) (crosschain/arbitrum/LibArbitrumL1.sol)
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pragma solidity ^0.8.4;
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import {IBridge as ArbitrumL1_Bridge} from "../../vendor/arbitrum/IBridge.sol";
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import {IOutbox as ArbitrumL1_Outbox} from "../../vendor/arbitrum/IOutbox.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 L1 to process cross-chain messages
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* originating from L2. For the other side, use {LibArbitrumL2}.
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*/
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library LibArbitrumL1 {
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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 the `bridge`.
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*/
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function isCrossChain(address bridge) internal view returns (bool) {
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return msg.sender == bridge;
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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 the `bridge`.
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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 bridge) internal view returns (address) {
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if (!isCrossChain(bridge)) revert NotCrossChainCall();
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address sender = ArbitrumL1_Outbox(ArbitrumL1_Bridge(bridge).activeOutbox()).l2ToL1Sender();
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require(sender != address(0), "LibArbitrumL1: system messages without sender");
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return sender;
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}
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}
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