You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
37 lines
1.4 KiB
Solidity
37 lines
1.4 KiB
Solidity
2 years ago
|
// SPDX-License-Identifier: MIT
|
||
|
|
// OpenZeppelin Contracts (last updated v4.7.0) (crosschain/optimism/LibOptimism.sol)
|
||
|
|
|
||
|
|
pragma solidity ^0.8.4;
|
||
|
|
|
||
|
|
import {ICrossDomainMessenger as Optimism_Bridge} from "../../vendor/optimism/ICrossDomainMessenger.sol";
|
||
|
|
import "../errors.sol";
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @dev Primitives for cross-chain aware contracts for https://www.optimism.io/[Optimism].
|
||
|
|
* See the https://community.optimism.io/docs/developers/bridge/messaging/#accessing-msg-sender[documentation]
|
||
|
|
* for the functionality used here.
|
||
|
|
*/
|
||
|
|
library LibOptimism {
|
||
|
|
/**
|
||
|
|
* @dev Returns whether the current function call is the result of a
|
||
|
|
* cross-chain message relayed by `messenger`.
|
||
|
|
*/
|
||
|
|
function isCrossChain(address messenger) internal view returns (bool) {
|
||
|
|
return msg.sender == messenger;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @dev Returns the address of the sender that triggered the current
|
||
|
|
* cross-chain message through `messenger`.
|
||
|
|
*
|
||
|
|
* 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 messenger) internal view returns (address) {
|
||
|
|
if (!isCrossChain(messenger)) revert NotCrossChainCall();
|
||
|
|
|
||
|
|
return Optimism_Bridge(messenger).xDomainMessageSender();
|
||
|
|
}
|
||
|
|
}
|