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1.5 KiB
Solidity

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (crosschain/arbitrum/LibArbitrumL1.sol)
pragma solidity ^0.8.4;
import {IBridge as ArbitrumL1_Bridge} from "../../vendor/arbitrum/IBridge.sol";
import {IOutbox as ArbitrumL1_Outbox} from "../../vendor/arbitrum/IOutbox.sol";
import "../errors.sol";
/**
* @dev Primitives for cross-chain aware contracts for
* https://arbitrum.io/[Arbitrum].
*
* This version should only be used on L1 to process cross-chain messages
* originating from L2. For the other side, use {LibArbitrumL2}.
*/
library LibArbitrumL1 {
/**
* @dev Returns whether the current function call is the result of a
* cross-chain message relayed by the `bridge`.
*/
function isCrossChain(address bridge) internal view returns (bool) {
return msg.sender == bridge;
}
/**
* @dev Returns the address of the sender that triggered the current
* cross-chain message through the `bridge`.
*
* 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 bridge) internal view returns (address) {
if (!isCrossChain(bridge)) revert NotCrossChainCall();
address sender = ArbitrumL1_Outbox(ArbitrumL1_Bridge(bridge).activeOutbox()).l2ToL1Sender();
require(sender != address(0), "LibArbitrumL1: system messages without sender");
return sender;
}
}