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