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73 lines
2.5 KiB
Solidity
73 lines
2.5 KiB
Solidity
// SPDX-License-Identifier: MIT
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// OpenZeppelin Contracts (last updated v4.7.0) (crosschain/polygon/CrossChainEnabledPolygonChild.sol)
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pragma solidity ^0.8.4;
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import "../CrossChainEnabled.sol";
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import "../../security/ReentrancyGuard.sol";
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import "../../utils/Address.sol";
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import "../../vendor/polygon/IFxMessageProcessor.sol";
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address constant DEFAULT_SENDER = 0x000000000000000000000000000000000000dEaD;
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/**
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* @dev https://polygon.technology/[Polygon] specialization or the
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* {CrossChainEnabled} abstraction the child side (polygon/mumbai).
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*
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* This version should only be deployed on child chain to process cross-chain
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* messages originating from the parent chain.
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*
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* The fxChild contract is provided and maintained by the polygon team. You can
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* find the address of this contract polygon and mumbai in
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* https://docs.polygon.technology/docs/develop/l1-l2-communication/fx-portal/#contract-addresses[Polygon's Fx-Portal documentation].
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*
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* _Available since v4.6._
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*/
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abstract contract CrossChainEnabledPolygonChild is IFxMessageProcessor, CrossChainEnabled, ReentrancyGuard {
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/// @custom:oz-upgrades-unsafe-allow state-variable-immutable
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address private immutable _fxChild;
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address private _sender = DEFAULT_SENDER;
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/// @custom:oz-upgrades-unsafe-allow constructor
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constructor(address fxChild) {
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_fxChild = fxChild;
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}
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/**
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* @dev see {CrossChainEnabled-_isCrossChain}
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*/
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function _isCrossChain() internal view virtual override returns (bool) {
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return msg.sender == _fxChild;
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}
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/**
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* @dev see {CrossChainEnabled-_crossChainSender}
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*/
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function _crossChainSender() internal view virtual override onlyCrossChain returns (address) {
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return _sender;
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}
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/**
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* @dev External entry point to receive and relay messages originating
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* from the fxChild.
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*
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* Non-reentrancy is crucial to avoid a cross-chain call being able
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* to impersonate anyone by just looping through this with user-defined
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* arguments.
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*
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* Note: if _fxChild calls any other function that does a delegate-call,
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* then security could be compromised.
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*/
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function processMessageFromRoot(
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uint256 /* stateId */,
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address rootMessageSender,
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bytes calldata data
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) external override nonReentrant {
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if (!_isCrossChain()) revert NotCrossChainCall();
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_sender = rootMessageSender;
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Address.functionDelegateCall(address(this), data, "cross-chain execution failed");
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_sender = DEFAULT_SENDER;
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}
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}
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