Contract Source Code (Solidity)

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Outline

• interface ILaPoste
•    - function receiveMessage(uint256 chain ...
•    - function sendMessage(MessageParams me ...
•  contract L1Sender *
•    - function broadcastBlock(uint256 chain ...
•    - function currentPeriod()

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/**
 *Submitted for verification at Etherscan.io on 2024-10-22
*/

// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity =0.8.19;

// src/interfaces/ILaPoste.sol

interface ILaPoste {
    struct Token {
        address tokenAddress;
        uint256 amount;
    }

    struct TokenMetadata {
        string name;
        string symbol;
        uint8 decimals;
    }

    struct MessageParams {
        uint256 destinationChainId;
        address to;
        Token token;
        bytes payload;
    }

    struct Message {
        uint256 destinationChainId;
        address to;
        address sender;
        Token token;
        TokenMetadata tokenMetadata;
        bytes payload;
        uint256 nonce;
    }

    function receiveMessage(uint256 chainId, bytes calldata payload) external;
    function sendMessage(MessageParams memory params, uint256 additionalGasLimit) external payable;
}

// src/oracle/L1Sender.sol

/// @notice A module for sending the block hash to the L1 block oracle updater.
contract L1Sender {
    /// @notice The La Poste address.
    address public immutable LA_POSTE;

    /// @notice The L1 block oracle address.
    address public immutable L1_BLOCK_ORACLE_UPDATER;

    /// @notice The error thrown when the block hash is sent too soon.
    error TooSoon();

    constructor(address _l1BlockOracleUpdater, address _laPoste) {
        LA_POSTE = _laPoste;
        L1_BLOCK_ORACLE_UPDATER = _l1BlockOracleUpdater;
    }

    /// @notice Sends the block hash to the L1 block oracle updater.
    function broadcastBlock(uint256 chainId, uint256 additionalGasLimit) external payable {
        if (block.timestamp < currentPeriod() + 1 minutes) revert TooSoon();

        bytes memory payload = abi.encode(block.number - 1, blockhash(block.number - 1), block.timestamp);

        ILaPoste.MessageParams memory params = ILaPoste.MessageParams({
            destinationChainId: chainId,
            to: L1_BLOCK_ORACLE_UPDATER,
            token: ILaPoste.Token({tokenAddress: address(0), amount: 0}),
            payload: payload
        });

        ILaPoste(LA_POSTE).sendMessage{value: msg.value}(params, additionalGasLimit);
    }

    function currentPeriod() internal view returns (uint256) {
        return block.timestamp / 1 weeks * 1 weeks;
    }
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"address","name":"_l1BlockOracleUpdater","type":"address"},{"internalType":"address","name":"_laPoste","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"TooSoon","type":"error"},{"inputs":[],"name":"L1_BLOCK_ORACLE_UPDATER","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"LA_POSTE","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"chainId","type":"uint256"},{"internalType":"uint256","name":"additionalGasLimit","type":"uint256"}],"name":"broadcastBlock","outputs":[],"stateMutability":"payable","type":"function"}]

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ipfs://57369ef7e9d9113f9e6fb39351ea0fbfc43413cfe798935b693ae6da02b0d302