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34 lines
1.1 KiB
34 lines
1.1 KiB
// SPDX-License-Identifier: MIT
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pragma solidity ^0.8.4;
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import {IAMB as AMB_Bridge} from "../../vendor/amb/IAMB.sol";
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import "../errors.sol";
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/**
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* @dev Primitives for cross-chain aware contracts using the
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* [AMB](https://docs.tokenbridge.net/amb-bridge/about-amb-bridge)
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* family of bridges.
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*/
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library LibAMB {
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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 `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 `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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return AMB_Bridge(bridge).messageSender();
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}
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}
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