// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "@openzeppelin/contracts/security/Pausable.sol";

/**
 * @title BlobKitEscrow
 * @notice Escrow contract for BlobKit blob storage payments
 * @dev Handles trustless payments for blob transaction execution
 *
 * Features:
 * - Job payment management with automatic refunds
 * - Proxy authorization and fee collection
 * - Configurable timeouts and replay protection
 * - Emergency pause functionality
 *
 * @author Zak Cole ([email protected])
 */
contract BlobKitEscrow is Ownable, ReentrancyGuard, Pausable {
    /*//////////////////////////////////////////////////////////////
                                CONSTANTS
    //////////////////////////////////////////////////////////////*/

    /// @notice Maximum proxy fee percentage (10%)
    uint256 public constant MAX_PROXY_FEE_PERCENT = 10;

    /// @notice Default job timeout (5 minutes)
    uint256 public constant DEFAULT_JOB_TIMEOUT = 5 minutes;

    /*//////////////////////////////////////////////////////////////
                                STORAGE
    //////////////////////////////////////////////////////////////*/

    /// @notice Job timeout duration in seconds
    uint256 public jobTimeout;

    /// @notice Mapping from proxy address to fee percentage
    mapping(address => uint256) public proxyFees;

    /// @notice Mapping from proxy address to authorization status
    mapping(address => bool) public authorizedProxies;

    /// @notice Job data structure
    struct Job {
        address user; // User who paid for the job
        uint256 amount; // Amount paid in wei
        bool completed; // Whether job has been completed
        uint256 timestamp; // When the job was created
        bytes32 blobTxHash; // Transaction hash of blob (set when completed)
    }

    /// @notice Mapping from job ID to job data
    mapping(bytes32 => Job) public jobs;

    /*//////////////////////////////////////////////////////////////
                                 EVENTS
    //////////////////////////////////////////////////////////////*/

    /// @notice Emitted when a new job is created with payment
    event JobCreated(bytes32 indexed jobId, address indexed user, uint256 amount);

    /// @notice Emitted when a job is completed by a proxy
    event JobCompleted(bytes32 indexed jobId, bytes32 blobTxHash, uint256 proxyFee);

    /// @notice Emitted when a job is refunded
    event JobRefunded(bytes32 indexed jobId, string reason);

    /// @notice Emitted when job timeout is updated
    event JobTimeoutUpdated(uint256 oldTimeout, uint256 newTimeout);

    /// @notice Emitted when a proxy is authorized or deauthorized
    event ProxyAuthorizationChanged(address indexed proxy, bool authorized);

    /// @notice Emitted when a proxy fee is updated
    event ProxyFeeUpdated(address indexed proxy, uint256 oldFee, uint256 newFee);

    /*//////////////////////////////////////////////////////////////
                                 ERRORS
    //////////////////////////////////////////////////////////////*/

    error JobAlreadyExists();
    error JobNotFound();
    error JobAlreadyCompleted();
    error JobExpired();
    error JobNotExpired();
    error UnauthorizedProxy();
    error InvalidProxyFee();
    error InvalidJobTimeout();
    error InvalidProof();
    error TransferFailed();
    error ZeroAmount();

    /*//////////////////////////////////////////////////////////////
                              CONSTRUCTOR
    //////////////////////////////////////////////////////////////*/

    /**
     * @notice Initialize the escrow contract
     * @param _owner Address of the contract owner
     */
    constructor(address _owner) {
        _transferOwnership(_owner);
        jobTimeout = DEFAULT_JOB_TIMEOUT;
    }

    /*//////////////////////////////////////////////////////////////
                            EXTERNAL FUNCTIONS
    //////////////////////////////////////////////////////////////*/

    /**
     * @notice Deposit payment for a blob job
     * @param jobId Unique identifier for the job
     * @dev Creates a new job with payment. Job ID must be unique.
     */
    function depositForBlob(bytes32 jobId) external payable nonReentrant whenNotPaused {
        if (msg.value == 0) revert ZeroAmount();
        if (jobs[jobId].user != address(0)) revert JobAlreadyExists();

        jobs[jobId] = Job({
            user: msg.sender,
            amount: msg.value,
            completed: false,
            timestamp: block.timestamp,
            blobTxHash: bytes32(0)
        });

        emit JobCreated(jobId, msg.sender, msg.value);
    }

    /**
     * @notice Complete a job and claim payment (proxy only)
     * @param jobId Job identifier
     * @param blobTxHash Transaction hash of the blob
     * @param proof Cryptographic proof of job completion
     * @dev Only authorized proxies can complete jobs. Includes replay protection.
     */
    function completeJob(bytes32 jobId, bytes32 blobTxHash, bytes calldata proof) external nonReentrant whenNotPaused {
        if (!authorizedProxies[msg.sender]) revert UnauthorizedProxy();

        Job storage job = jobs[jobId];
        if (job.user == address(0)) revert JobNotFound();
        if (job.completed) revert JobAlreadyCompleted();

        // Check if job is still valid (not expired)
        if (block.timestamp > job.timestamp + jobTimeout) {
            revert JobExpired();
        }

        // Verify proof (simple signature verification)
        if (!_verifyProof(jobId, blobTxHash, proof, msg.sender)) {
            revert InvalidProof();
        }

        // Mark job as completed (replay protection)
        job.completed = true;
        job.blobTxHash = blobTxHash;

        // Calculate proxy fee
        uint256 proxyFeePercent = proxyFees[msg.sender];
        uint256 proxyFee = (job.amount * proxyFeePercent) / 100;

        // Transfer entire amount to proxy (proxy covers blob costs)
        (bool success,) = payable(msg.sender).call{value: job.amount}("");
        if (!success) revert TransferFailed();

        emit JobCompleted(jobId, blobTxHash, proxyFee);
    }

    /**
     * @notice Refund an expired job
     * @param jobId Job identifier
     * @dev Anyone can trigger refunds for expired jobs
     */
    function refundExpiredJob(bytes32 jobId) external nonReentrant {
        Job storage job = jobs[jobId];
        if (job.user == address(0)) revert JobNotFound();
        if (job.completed) revert JobAlreadyCompleted();

        // Check if job has expired
        if (block.timestamp <= job.timestamp + jobTimeout) {
            revert JobNotExpired();
        }

        // Mark job as completed to prevent double refunds
        job.completed = true;

        // Refund full amount to user
        (bool success,) = payable(job.user).call{value: job.amount}("");
        if (!success) revert TransferFailed();

        emit JobRefunded(jobId, "Job expired");
    }

    /**
     * @notice Set proxy fee percentage (proxy only)
     * @param percent Fee percentage (0-10)
     * @dev Only authorized proxies can set their own fees
     */
    function setProxyFee(uint256 percent) external {
        if (!authorizedProxies[msg.sender]) revert UnauthorizedProxy();
        if (percent > MAX_PROXY_FEE_PERCENT) revert InvalidProxyFee();

        uint256 oldFee = proxyFees[msg.sender];
        proxyFees[msg.sender] = percent;

        emit ProxyFeeUpdated(msg.sender, oldFee, percent);
    }

    /*//////////////////////////////////////////////////////////////
                            OWNER FUNCTIONS
    //////////////////////////////////////////////////////////////*/

    /**
     * @notice Set job timeout duration (owner only)
     * @param _timeout New timeout in seconds
     * @dev Minimum timeout is 1 minute, maximum is 24 hours
     */
    function setJobTimeout(uint256 _timeout) external onlyOwner {
        if (_timeout < 1 minutes || _timeout > 24 hours) {
            revert InvalidJobTimeout();
        }

        uint256 oldTimeout = jobTimeout;
        jobTimeout = _timeout;

        emit JobTimeoutUpdated(oldTimeout, _timeout);
    }

    /**
     * @notice Authorize or deauthorize a proxy (owner only)
     * @param proxy Proxy address
     * @param authorized Authorization status
     */
    function setProxyAuthorization(address proxy, bool authorized) external onlyOwner {
        authorizedProxies[proxy] = authorized;
        emit ProxyAuthorizationChanged(proxy, authorized);
    }

    /**
     * @notice Pause the contract (owner only)
     * @dev Prevents new deposits and job completions
     */
    function pause() external onlyOwner {
        _pause();
    }

    /**
     * @notice Unpause the contract (owner only)
     */
    function unpause() external onlyOwner {
        _unpause();
    }

    /**
     * @notice Emergency withdrawal (owner only)
     * @dev Only usable when contract is paused
     */
    function emergencyWithdraw() external onlyOwner whenPaused {
        uint256 balance = address(this).balance;
        (bool success,) = payable(owner()).call{value: balance}("");
        if (!success) revert TransferFailed();
    }

    /*//////////////////////////////////////////////////////////////
                             VIEW FUNCTIONS
    //////////////////////////////////////////////////////////////*/

    /**
     * @notice Get job timeout duration
     * @return Current job timeout in seconds
     */
    function getJobTimeout() external view returns (uint256) {
        return jobTimeout;
    }

    /**
     * @notice Check if a job exists and get its details
     * @param jobId Job identifier
     * @return job Job details
     */
    function getJob(bytes32 jobId) external view returns (Job memory job) {
        return jobs[jobId];
    }

    /**
     * @notice Check if a job is expired
     * @param jobId Job identifier
     * @return True if job is expired
     */
    function isJobExpired(bytes32 jobId) external view returns (bool) {
        Job memory job = jobs[jobId];
        if (job.user == address(0) || job.completed) return false;
        return block.timestamp > job.timestamp + jobTimeout;
    }

    /**
     * @notice Get proxy fee for a specific proxy
     * @param proxy Proxy address
     * @return Fee percentage
     */
    function getProxyFee(address proxy) external view returns (uint256) {
        return proxyFees[proxy];
    }

    /**
     * @notice Check if a proxy is authorized
     * @param proxy Proxy address
     * @return True if proxy is authorized
     */
    function isProxyAuthorized(address proxy) external view returns (bool) {
        return authorizedProxies[proxy];
    }

    /*//////////////////////////////////////////////////////////////
                           INTERNAL FUNCTIONS
    //////////////////////////////////////////////////////////////*/

    /**
     * @notice Verify job completion proof
     * @param jobId Job identifier
     * @param blobTxHash Blob transaction hash
     * @param proof Signature proof
     * @param signer Expected signer address
     * @return True if proof is valid
     * @dev Verifies signature includes proxy address to prevent cross-proxy claims
     */
    function _verifyProof(bytes32 jobId, bytes32 blobTxHash, bytes calldata proof, address signer)
        internal
        pure
        returns (bool)
    {
        if (proof.length != 65) return false;

        // Create message hash that includes the proxy address
        bytes32 messageHash = keccak256(abi.encodePacked(jobId, blobTxHash, signer));
        bytes32 ethSignedMessageHash = keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", messageHash));

        // Extract signature components
        bytes32 r;
        bytes32 s;
        uint8 v;

        assembly {
            r := calldataload(proof.offset)
            s := calldataload(add(proof.offset, 0x20))
            v := byte(0, calldataload(add(proof.offset, 0x40)))
        }

        // Recover signer address
        address recoveredSigner = ecrecover(ethSignedMessageHash, v, r, s);
        return recoveredSigner == signer;
    }
}

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

pragma solidity ^0.8.0;

import "../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.
 *
 * By default, the owner account will be the one that deploys the contract. 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;

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @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 {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @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 {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _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);
    }
}

// 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;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (security/Pausable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract Pausable is Context {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    constructor() {
        _paused = false;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        _requireNotPaused();
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        _requirePaused();
        _;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }

    /**
     * @dev Throws if the contract is paused.
     */
    function _requireNotPaused() internal view virtual {
        require(!paused(), "Pausable: paused");
    }

    /**
     * @dev Throws if the contract is not paused.
     */
    function _requirePaused() internal view virtual {
        require(paused(), "Pausable: not paused");
    }

    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @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;
    }
}

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    "erc4626-tests/=lib/openzeppelin-contracts/lib/erc4626-tests/",
    "forge-std/=lib/forge-std/src/",
    "openzeppelin-contracts/=lib/openzeppelin-contracts/",
    "openzeppelin/=lib/openzeppelin-contracts/contracts/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "ipfs",
    "appendCBOR": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
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        "devdoc",
        "userdoc",
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    }
  },
  "evmVersion": "shanghai",
  "viaIR": false
}

• No Contract Security Audit Submitted- Submit Audit Here

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BlobKitEscrow.Job","name":"job","type":"tuple"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getJobTimeout","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"proxy","type":"address"}],"name":"getProxyFee","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"jobId","type":"bytes32"}],"name":"isJobExpired","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"proxy","type":"address"}],"name":"isProxyAuthorized","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"jobTimeout","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"name":"jobs","outputs":[{"internalType":"address","name":"user","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"bool","name":"completed","type":"bool"},{"internalType":"uint256","name":"timestamp","type":"uint256"},{"internalType":"bytes32","name":"blobTxHash","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"pause","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"paused","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"proxyFees","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"jobId","type":"bytes32"}],"name":"refundExpiredJob","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_timeout","type":"uint256"}],"name":"setJobTimeout","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"proxy","type":"address"},{"internalType":"bool","name":"authorized","type":"bool"}],"name":"setProxyAuthorization","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"percent","type":"uint256"}],"name":"setProxyFee","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"unpause","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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