XphloBridgeEscrow

{{
  "language": "Solidity",
  "sources": {
    "@openzeppelin/contracts/access/Ownable.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (access/Ownable.sol)

pragma solidity ^0.8.20;

import {Context} from "../utils/Context.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * The initial owner is set to the address provided by the deployer. This can
 * later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    /**
     * @dev The caller account is not authorized to perform an operation.
     */
    error OwnableUnauthorizedAccount(address account);

    /**
     * @dev The owner is not a valid owner account. (eg. `address(0)`)
     */
    error OwnableInvalidOwner(address owner);

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the address provided by the deployer as the initial owner.
     */
    constructor(address initialOwner) {
        if (initialOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _transferOwnership(initialOwner);
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        if (owner() != _msgSender()) {
            revert OwnableUnauthorizedAccount(_msgSender());
        }
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        if (newOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}
"
    },
    "@openzeppelin/contracts/token/ERC20/IERC20.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (token/ERC20/IERC20.sol)

pragma solidity >=0.4.16;

/**
 * @dev Interface of the ERC-20 standard as defined in the ERC.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the value of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the value of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves a `value` amount of tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 value) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets a `value` amount of tokens as the allowance of `spender` over the
     * caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the
     * allowance mechanism. `value` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 value) external returns (bool);
}
"
    },
    "@openzeppelin/contracts/utils/Context.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.1) (utils/Context.sol)

pragma solidity ^0.8.20;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }

    function _contextSuffixLength() internal view virtual returns (uint256) {
        return 0;
    }
}
"
    },
    "@openzeppelin/contracts/utils/ReentrancyGuard.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (utils/ReentrancyGuard.sol)

pragma solidity ^0.8.20;

/**
 * @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 EIP-1153 (transient storage) is available on the chain you're deploying at,
 * consider using {ReentrancyGuardTransient} instead.
 *
 * 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;

    /**
     * @dev Unauthorized reentrant call.
     */
    error ReentrancyGuardReentrantCall();

    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
        if (_status == ENTERED) {
            revert ReentrancyGuardReentrantCall();
        }

        // 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;
    }
}
"
    },
    "contracts/bridge/XphloBridgeEscrow.sol": {
      "content": "// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";

/**
 * @title XphloBridgeEscrow
 * @dev Bridge contract for locking XPHLO tokens on L1 Ethereum
 * Handles deposits to L2 and withdrawals back to L1
 */
contract XphloBridgeEscrow is Ownable, ReentrancyGuard {
    
    // XPHLO token contract on L1 Ethereum
    IERC20 public immutable xphloToken;
    
    // L2 bridge contract address on Arbitrum
    address public l2BridgeContract;
    
    // Arbitrum Inbox contract for L1→L2 messaging
    address public arbitrumInbox;
    
    // Withdrawal Manager contract for handling L2→L1 withdrawals
    address public withdrawalManager;
    
    // Bridge configuration
    bool public bridgePaused = false;
    uint256 public dailyDepositLimit = 100000 * 10**18; // 100k XPHLO per day
    uint256 public minDepositAmount = 1 * 10**18; // 1 XPHLO minimum
    uint256 public maxDepositAmount = 10000 * 10**18; // 10k XPHLO maximum per tx
    
    // Daily deposit tracking
    mapping(uint256 => uint256) public dailyDeposits; // day => total deposits
    
    // Withdrawal tracking
    mapping(bytes32 => bool) public processedWithdrawals;
    
    // Events
    event DepositInitiated(
        address indexed user,
        address indexed l2Recipient,
        uint256 amount,
        bytes32 indexed depositId,
        uint256 timestamp
    );
    
    event WithdrawalProcessed(
        address indexed user,
        uint256 amount,
        bytes32 indexed withdrawalId,
        uint256 timestamp
    );
    
    event BridgeConfigUpdated(
        uint256 dailyLimit,
        uint256 minAmount,
        uint256 maxAmount
    );
    
    event BridgePauseToggled(bool paused);
    
    // Custom errors
    error BridgePaused();
    error InvalidAmount();
    error DailyLimitExceeded();
    error WithdrawalAlreadyProcessed();
    error InvalidL2Contract();
    error InsufficientBalance();
    error TransferFailed();
    
    /**
     * @dev Constructor
     * @param _xphloToken Address of XPHLO token on L1
     * @param _arbitrumInbox Address of Arbitrum Inbox contract
     */
    constructor(
        address _xphloToken,
        address _arbitrumInbox
    ) Ownable(msg.sender) {
        require(_xphloToken != address(0), "Invalid XPHLO token address");
        require(_arbitrumInbox != address(0), "Invalid Arbitrum Inbox address");
        
        xphloToken = IERC20(_xphloToken);
        arbitrumInbox = _arbitrumInbox;
    }
    
    /**
     * @dev Deposit XPHLO tokens to bridge to L2
     * @param amount Amount of XPHLO to deposit
     * @param l2Recipient Address to receive tokens on L2
     */
    function deposit(uint256 amount, address l2Recipient) external nonReentrant {
        if (bridgePaused) revert BridgePaused();
        if (amount < minDepositAmount || amount > maxDepositAmount) revert InvalidAmount();
        if (l2Recipient == address(0)) revert InvalidL2Contract();
        
        // Check daily limits
        uint256 today = block.timestamp / 1 days;
        if (dailyDeposits[today] + amount > dailyDepositLimit) {
            revert DailyLimitExceeded();
        }
        
        // Update daily deposit tracking
        dailyDeposits[today] += amount;
        
        // Transfer XPHLO tokens to this contract
        bool success = xphloToken.transferFrom(msg.sender, address(this), amount);
        if (!success) revert TransferFailed();
        
        // Generate unique deposit ID
        bytes32 depositId = keccak256(abi.encodePacked(
            msg.sender,
            l2Recipient,
            amount,
            block.timestamp,
            block.number
        ));
        
        // TODO: Send message to L2 via Arbitrum Inbox
        // This will be implemented when we add Arbitrum messaging
        
        emit DepositInitiated(
            msg.sender,
            l2Recipient,
            amount,
            depositId,
            block.timestamp
        );
    }
    
    /**
     * @dev Process withdrawal from L2 back to L1 (called by Withdrawal Manager)
     * @param user Address of user withdrawing
     * @param amount Amount to withdraw
     * @param withdrawalId Unique withdrawal identifier
     * @param merkleProof Merkle proof validating the withdrawal
     */
    function processWithdrawal(
        address user,
        uint256 amount,
        bytes32 withdrawalId,
        bytes32[] calldata merkleProof
    ) external nonReentrant {
        // Only Withdrawal Manager can call this function
        if (msg.sender != withdrawalManager) {
            revert InvalidL2Contract(); // Reusing existing error
        }
        
        if (processedWithdrawals[withdrawalId]) {
            revert WithdrawalAlreadyProcessed();
        }
        
        // Mark withdrawal as processed
        processedWithdrawals[withdrawalId] = true;
        
        // Check contract has sufficient balance
        if (xphloToken.balanceOf(address(this)) < amount) {
            revert InsufficientBalance();
        }
        
        // Transfer XPHLO back to user
        bool success = xphloToken.transfer(user, amount);
        if (!success) revert TransferFailed();
        
        emit WithdrawalProcessed(user, amount, withdrawalId, block.timestamp);
    }
    
    /**
     * @dev Initiate withdrawal request through Withdrawal Manager
     * @param user Address of user withdrawing
     * @param amount Amount to withdraw
     * @param withdrawalId Unique withdrawal identifier
     * @param merkleProof Merkle proof validating the withdrawal
     * @param merkleRoot Specific merkle root to validate against
     */
    function initiateWithdrawal(
        address user,
        uint256 amount,
        bytes32 withdrawalId,
        bytes32[] calldata merkleProof,
        bytes32 merkleRoot
    ) external nonReentrant {
        if (bridgePaused) revert BridgePaused();
        if (withdrawalManager == address(0)) revert InvalidL2Contract();
        
        // Forward to Withdrawal Manager for security delay processing
        (bool success,) = withdrawalManager.call(
            abi.encodeWithSignature(
                "initiateWithdrawal(address,uint256,bytes32,bytes32[],bytes32)",
                user,
                amount,
                withdrawalId,
                merkleProof,
                merkleRoot
            )
        );
        
        require(success, "Withdrawal initiation failed");
    }
    
    /**
     * @dev Get current day's deposit total
     * @return Current day's total deposits
     */
    function getTodayDeposits() external view returns (uint256) {
        uint256 today = block.timestamp / 1 days;
        return dailyDeposits[today];
    }
    
    /**
     * @dev Get remaining deposit limit for today
     * @return Remaining deposit limit
     */
    function getRemainingDailyLimit() external view returns (uint256) {
        uint256 today = block.timestamp / 1 days;
        uint256 used = dailyDeposits[today];
        return used >= dailyDepositLimit ? 0 : dailyDepositLimit - used;
    }
    
    /**
     * @dev Get total XPHLO locked in bridge
     * @return Total locked balance
     */
    function getTotalLocked() external view returns (uint256) {
        return xphloToken.balanceOf(address(this));
    }
    
    // ================================
    // ADMIN FUNCTIONS
    // ================================
    
    /**
     * @dev Set L2 bridge contract address
     * @param _l2BridgeContract Address of bridge on L2
     */
    function setL2BridgeContract(address _l2BridgeContract) external onlyOwner {
        require(_l2BridgeContract != address(0), "Invalid L2 bridge address");
        l2BridgeContract = _l2BridgeContract;
    }
    
    /**
     * @dev Set Withdrawal Manager contract address
     * @param _withdrawalManager Address of Withdrawal Manager contract
     */
    function setWithdrawalManager(address _withdrawalManager) external onlyOwner {
        require(_withdrawalManager != address(0), "Invalid withdrawal manager address");
        withdrawalManager = _withdrawalManager;
    }
    
    /**
     * @dev Update bridge configuration
     * @param _dailyLimit New daily deposit limit
     * @param _minAmount New minimum deposit amount
     * @param _maxAmount New maximum deposit amount
     */
    function updateBridgeConfig(
        uint256 _dailyLimit,
        uint256 _minAmount,
        uint256 _maxAmount
    ) external onlyOwner {
        require(_minAmount > 0, "Min amount must be > 0");
        require(_maxAmount > _minAmount, "Max must be > min");
        require(_dailyLimit > _maxAmount, "Daily limit must be > max amount");
        
        dailyDepositLimit = _dailyLimit;
        minDepositAmount = _minAmount;
        maxDepositAmount = _maxAmount;
        
        emit BridgeConfigUpdated(_dailyLimit, _minAmount, _maxAmount);
    }
    
    /**
     * @dev Pause or unpause the bridge
     * @param _paused True to pause, false to unpause
     */
    function setBridgePaused(bool _paused) external onlyOwner {
        bridgePaused = _paused;
        emit BridgePauseToggled(_paused);
    }
    
    /**
     * @dev Emergency function to recover tokens (only owner)
     * @param token Token address to recover
     * @param amount Amount to recover
     */
    function emergencyRecoverTokens(address token, uint256 amount) external onlyOwner {
        require(token != address(xphloToken), "Cannot recover XPHLO (use proper withdrawal)");
        IERC20(token).transfer(owner(), amount);
    }
}"
    }
  },
  "settings": {
    "optimizer": {
      "enabled": true,
      "runs": 1000000
    },
    "viaIR": true,
    "evmVersion": "paris",
    "outputSelection": {
      "*": {
        "*": [
          "evm.bytecode",
          "evm.deployedBytecode",
          "devdoc",
          "userdoc",
          "metadata",
          "abi"
        ]
      }
    }
  }
}}