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smom-dbis-138/contracts/mainnet-checkpoint/interfaces/ICheckpointExtension.sol

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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;
import {CheckpointStorage} from "../storage/CheckpointStorage.sol";
import {CheckpointLeaf} from "../libraries/CheckpointLeaf.sol";
/**
* @title ICheckpointExtension
* @notice Pluggable modules for unlimited extensibility (hub invokes via call; delegatecall optional per module).
*/
interface ICheckpointExtension {
/// @dev Hook bitmasks — new hooks require implementation upgrade + gap only on hub
function HOOK_BEFORE_SUBMIT() external pure returns (uint32);
function HOOK_AFTER_SUBMIT() external pure returns (uint32);
function HOOK_ON_CCIP() external pure returns (uint32);
function HOOK_VERIFY_LEAF() external pure returns (uint32);
function beforeSubmit(CheckpointStorage.CheckpointHeader calldata header, bytes calldata data) external;
function afterSubmit(CheckpointStorage.CheckpointHeader calldata header, bytes calldata data) external;
function onCCIPReceive(bytes calldata messageData) external;
/// @notice Optional custom leaf verification (return true to accept, false to defer to core Merkle)
function verifyLeaf(
CheckpointStorage.CheckpointHeader calldata header,
CheckpointLeaf.PaymentLeafV1 calldata leaf,
bytes32[] calldata proof
) external view returns (bool);
}