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.

55 lines
1.8 KiB
Solidity

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (crosschain/CrossChainEnabled.sol)
pragma solidity ^0.8.4;
import "./errors.sol";
/**
* @dev Provides information for building cross-chain aware contracts. This
* abstract contract provides accessors and modifiers to control the execution
* flow when receiving cross-chain messages.
*
* Actual implementations of cross-chain aware contracts, which are based on
* this abstraction, will have to inherit from a bridge-specific
* specialization. Such specializations are provided under
* `crosschain/<chain>/CrossChainEnabled<chain>.sol`.
*
* _Available since v4.6._
*/
abstract contract CrossChainEnabled {
/**
* @dev Throws if the current function call is not the result of a
* cross-chain execution.
*/
modifier onlyCrossChain() {
if (!_isCrossChain()) revert NotCrossChainCall();
_;
}
/**
* @dev Throws if the current function call is not the result of a
* cross-chain execution initiated by `account`.
*/
modifier onlyCrossChainSender(address expected) {
address actual = _crossChainSender();
if (expected != actual) revert InvalidCrossChainSender(actual, expected);
_;
}
/**
* @dev Returns whether the current function call is the result of a
* cross-chain message.
*/
function _isCrossChain() internal view virtual returns (bool);
/**
* @dev Returns the address of the sender of the cross-chain message that
* triggered the current function call.
*
* IMPORTANT: Should revert with `NotCrossChainCall` if the current function
* call is not the result of a cross-chain message.
*/
function _crossChainSender() internal view virtual returns (address);
}