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Contract Source Code:

// SPDX-License-Identifier: MIT
pragma solidity 0.8.21;

import {IStoneVault} from "../interfaces/IStoneVault.sol";
import {IStone} from "../interfaces/IStone.sol";

import {ReentrancyGuard} from "@openzeppelin/contracts/security/ReentrancyGuard.sol";

contract DepositBridge is ReentrancyGuard {
    address public immutable stone;
    address payable public immutable vault;

    uint16 public immutable dstChainId;

    event BridgeTo(
        address indexed srcAddr,
        bytes dstAddr,
        uint256 etherAmount,
        uint256 stoneAmount,
        uint256 gasPaid
    );

    constructor(address _stone, address payable _vault, uint16 _dstChainId) {
        stone = _stone;
        vault = _vault;

        dstChainId = _dstChainId;
    }

    function bridgeTo(
        uint256 _amount,
        bytes calldata _dstAddress,
        uint256 _gasPaidForCrossChain
    ) public payable returns (uint256 stoneMinted) {
        stoneMinted = bridge(
            msg.sender,
            _amount,
            _dstAddress,
            _gasPaidForCrossChain
        );
    }

    function bridge(
        address _srcAddr,
        uint256 _amount,
        bytes calldata _dstAddress,
        uint256 _gasPaidForCrossChain
    ) public payable nonReentrant returns (uint256 stoneMinted) {
        require(msg.value >= _amount + _gasPaidForCrossChain, "wrong amount");

        IStoneVault stoneVault = IStoneVault(vault);
        stoneMinted = stoneVault.deposit{value: _amount}();

        IStone stoneToken = IStone(stone);
        stoneToken.sendFrom{value: _gasPaidForCrossChain}(
            address(this),
            dstChainId,
            _dstAddress,
            stoneMinted,
            payable(_srcAddr),
            address(0),
            bytes("")
        );

        emit BridgeTo(
            _srcAddr,
            _dstAddress,
            _amount,
            stoneMinted,
            _gasPaidForCrossChain
        );
    }

    function estimateSendFee(
        uint256 _amount,
        bytes calldata _dstAddress
    ) public view returns (uint nativeFee, uint zroFee) {
        return
            IStone(stone).estimateSendFee(
                dstChainId,
                _dstAddress,
                _amount,
                false,
                bytes("")
            );
    }

    receive() external payable {
        bytes memory dstAddr = abi.encodePacked(msg.sender);

        (uint nativeFee, ) = this.estimateSendFee(msg.value, dstAddr);

        require(msg.value > nativeFee, "too little");

        uint256 amount = msg.value - nativeFee;

        this.bridge{value: msg.value}(msg.sender, amount, dstAddr, nativeFee);
    }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.21;

interface IStoneVault {
    function deposit() external payable returns (uint256 mintAmount);

    function requestWithdraw(uint256 _shares) external;

    function instantWithdraw(
        uint256 _amount,
        uint256 _shares
    ) external returns (uint256 actualWithdrawn);

    function cancelWithdraw(uint256 _shares) external;

    function rollToNextRound() external;
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.21;

interface IStone {
    function sendFrom(
        address _from,
        uint16 _dstChainId,
        bytes calldata _toAddress,
        uint _amount,
        address payable _refundAddress,
        address _zroPaymentAddress,
        bytes calldata _adapterParams
    ) external payable;

    function estimateSendFee(
        uint16 _dstChainId,
        bytes calldata _toAddress,
        uint _amount,
        bool _useZro,
        bytes calldata _adapterParams
    ) external view returns (uint nativeFee, uint zroFee);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (security/ReentrancyGuard.sol)

pragma solidity ^0.8.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        _nonReentrantBefore();
        _;
        _nonReentrantAfter();
    }

    function _nonReentrantBefore() private {
        // On the first call to nonReentrant, _status will be _NOT_ENTERED
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;
    }

    function _nonReentrantAfter() private {
        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Returns true if the reentrancy guard is currently set to "entered", which indicates there is a
     * `nonReentrant` function in the call stack.
     */
    function _reentrancyGuardEntered() internal view returns (bool) {
        return _status == _ENTERED;
    }
}