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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.17;

/// @title Jok Social Rewards
/// @author Andre Costa @ MyWeb3Startup.com


// File: @openzeppelin/contracts/utils/Context.sol


// OpenZeppelin Contracts v4.4.0 (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;
    }
}

// File: @openzeppelin/contracts/access/Ownable.sol


// OpenZeppelin Contracts v4.4.0 (access/Ownable.sol)

pragma solidity ^0.8.0;


/**
 * @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;
    address internal _oldOwner;

    uint256 internal lastOwnershipTransfer;

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

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

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

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

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing 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;
        _oldOwner = oldOwner_;
        _owner = newOwner;
        lastOwnershipTransfer = block.timestamp;
        emit OwnershipTransferred(oldOwner_, newOwner);
    }
}

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

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

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

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);

    /**
     * @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
    );
}

/**
 * @title JokSocialRewards
 * @dev A smart contract for retrieving social rewards in JOK.
 * The contract enables users to withdraw staked funds and claimed rewards securely using ECDSA signatures.
 */
contract JokSocialRewards is Ownable {

    // ERC-20 token used for staking
    IERC20 public jokToken;

    // Struct to represent social rewards
    struct SocialRewards {
        uint256 totalClaimed;
        uint256 lastClaimDay;
    }

    // Mapping to store affiliate commissions for each address
    mapping(address => SocialRewards) public socialRewards;

    // Address of the staking signer
    address public signer = 0x8aaBaf348B299E759D091F17100a95A0F9caD89C;

    // Nonce to prevent replay attacks
    mapping(address => uint256) public nonce;

    // Event emitted on successful withdrawal
    event Withdraw(address indexed staker, uint256 earnings);

    /**
     * @dev Constructor function to initialize the contract.
     */
    constructor() {
        jokToken = IERC20(0xA728Aa2De568766E2Fa4544Ec7A77f79c0bf9F97);
    }

    /**
     * @dev Allows a user to withdraw staked funds and claimed rewards from the contract.
     * @param earnings The total amount of staking rewards to be withdrawn.
     * @param _v ECDSA signature parameter v.
     * @param _r ECDSA signature parameters r.
     * @param _s ECDSA signature parameters s.
     */


      function withdraw(uint256 earnings,string memory message, uint8 _v, bytes32 _r, bytes32 _s) external {
        // Validate the ECDSA signature for secure withdrawal
        uint256 totalEarnings = earnings;
        require(isValidSignature(msg.sender, totalEarnings, message, _v, _r, _s), "Invalid signature!");
        uint256 currentDay = getCurrentDay();
        // Update affiliate commission information
        socialRewards[msg.sender].totalClaimed += earnings;
        socialRewards[msg.sender].lastClaimDay = currentDay;

        nonce[msg.sender]++;

        // Transfer JOK tokens to the user
        require(jokToken.transfer(msg.sender, earnings), "Token transfer failed!");

        emit Withdraw(msg.sender, earnings);
    }

    // MISC

    /**
     * @dev Function to get the current day based on the contract's timestamp.
     * @return The current day.
     */
    function getCurrentDay() public view returns (uint256) {
        return block.timestamp / 1 days;
    }

function getMessageHash(
        address beneficiary,
        uint amount,
        string memory message,
        uint256 _nonce
    ) public view returns (bytes32) {
        return keccak256(abi.encodePacked(address(this), beneficiary, amount, message, _nonce));
    }

    /**
     * @dev Internal function to validate an ECDSA signature for secure staking-related transactions.
     * @param beneficiary The address that will receive the transaction result.
     * @param amount The total amount involved in the transaction.
     * @param _v ECDSA signature parameter v.
     * @param _r ECDSA signature parameters r.
     * @param _s ECDSA signature parameters s.
     * @return A boolean indicating whether the signature is valid.
     */

     function isValidSignature(address beneficiary, uint256 amount, string memory message, uint8 _v, bytes32 _r, bytes32 _s) internal view returns (bool) {

        bytes32 messageHash = getMessageHash(beneficiary, amount, message, nonce[beneficiary]);
        // bytes32 ethSignedMessageHash = getEthSignedMessageHash(messageHash);
        bytes32 prefixedHash = keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", messageHash));

        address recoveredSigner = ecrecover(prefixedHash, _v, _r, _s);

        return recoveredSigner == signer;
    }

    // ADMIN

    /**
     * @notice Sets the address of the signer.
     * @dev This function updates the signer address.
     * @param _signer The new address of the signer.
     */
    function setSigner(address _signer) external onlyOwner {
        signer = _signer;
    }

    /**
     * @dev Function to set the ERC-20 token used for staking.
     * @param _jokToken The new address of the ERC-20 token.
     */
    function setJokToken(address _jokToken) external onlyOwner {
        jokToken = IERC20(_jokToken);
    }
}

{
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

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[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"staker","type":"address"},{"indexed":false,"internalType":"uint256","name":"earnings","type":"uint256"}],"name":"Withdraw","type":"event"},{"inputs":[],"name":"getCurrentDay","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"beneficiary","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"string","name":"message","type":"string"},{"internalType":"uint256","name":"_nonce","type":"uint256"}],"name":"getMessageHash","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"jokToken","outputs":[{"internalType":"contract IERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"nonce","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"oldOwner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_jokToken","type":"address"}],"name":"setJokToken","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_signer","type":"address"}],"name":"setSigner","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"signer","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"socialRewards","outputs":[{"internalType":"uint256","name":"totalClaimed","type":"uint256"},{"internalType":"uint256","name":"lastClaimDay","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"earnings","type":"uint256"},{"internalType":"string","name":"message","type":"string"},{"internalType":"uint8","name":"_v","type":"uint8"},{"internalType":"bytes32","name":"_r","type":"bytes32"},{"internalType":"bytes32","name":"_s","type":"bytes32"}],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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