Rewards

{{
  "language": "Solidity",
  "sources": {
    "contracts/Rewards.sol": {
      "content": "// File: contracts/Context.sol


// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.23;

/**
 * @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: contracts/Ownable.sol


// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)

pragma solidity ^0.8.23;


/**
 * @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 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;
    _owner = newOwner;
    emit OwnershipTransferred(oldOwner, newOwner);
  }
}


// OpenZeppelin Contracts (last updated v5.0.0) (utils/Pausable.sol)

pragma solidity ^0.8.23;

/**
 * @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 {
  bool private _paused;

  /**
   * @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);

  /**
   * @dev The operation failed because the contract is paused.
     */
  error EnforcedPause();

  /**
   * @dev The operation failed because the contract is not paused.
     */
  error ExpectedPause();

  /**
   * @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 {
    if (paused()) {
      revert EnforcedPause();
    }
  }

  /**
   * @dev Throws if the contract is not paused.
     */
  function _requirePaused() internal view virtual {
    if (!paused()) {
      revert ExpectedPause();
    }
  }

  /**
   * @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 (last updated v5.0.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.20;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
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);
}


pragma solidity ^0.8.23;

contract Rewards is Ownable, Pausable {
  IERC20 immutable public ERC20Token;

  uint256 public totalRewards;
  mapping(address => uint256) public balances;

  /// @notice This event is emitted when a admin set amount of user's reward.
  /// @dev emitted in saveRewards() function
  /// @param user The account that have changed reward
  /// @param newReward The amount of changed ERC20 reward
  event RewardChanged(address indexed user, uint256 newReward);

  /// @notice This event is emitted when a user withdrawn all their collected rewards.
  /// @dev emitted in withdrawAll() function
  /// @param user The account that decided to make withdraw
  /// @param amount The amount of collected ERC20
  event Withdrawn(address indexed user, uint256 amount);

  constructor(address _ERC20Token) {
    ERC20Token = IERC20(_ERC20Token);
  }

  /// @notice Withdraw all collected rewards
  function withdrawAll() whenNotPaused external {
    address cachedSender = msg.sender;

    uint256 balance = balances[cachedSender];
    balances[cachedSender] = 0;
    totalRewards -= balance;

    emit Withdrawn(cachedSender, balance);

    bool success = ERC20Token.transfer(cachedSender, balance);
    require(success, 'unsuccessful');
  }

  /// @notice Withdraw collected rewards
  function withdraw(uint256 amount) whenNotPaused external {
    address cachedSender = msg.sender;

    uint256 balance = balances[cachedSender];
    require(amount <= balance, "amount more then balance");
    balances[cachedSender] = balance - amount;
    totalRewards -= amount;

    emit Withdrawn(cachedSender, amount);

    bool success = ERC20Token.transfer(cachedSender, amount);
    require(success, 'unsuccessful');
  }


  /// @notice Rewrite collected rewards for winners
  function saveRewards(
    address[] calldata winners,
    uint256[] calldata rewards
  ) onlyOwner external {
    require(winners.length == rewards.length, "winners.l != rewards.l");

    uint256 newTotal = totalRewards;
    for (uint256 i = 0; i < winners.length; i++) {
      newTotal = newTotal + rewards[i] - balances[winners[i]];
      balances[winners[i]] = rewards[i];
      emit RewardChanged(winners[i], rewards[i]);
    }
    require(ERC20Token.balanceOf(address(this)) >= newTotal, "balance less then totalRewards");
    totalRewards = newTotal;
  }

  function rescueERC20(address token) external onlyOwner {
    require(token != address(ERC20Token), "use withdraw for main token");
    IERC20(token).transfer(msg.sender, IERC20(token).balanceOf(address(this)));
  }

  function rescueETH() external onlyOwner {
    (bool success, ) = payable(owner()).call{value: address(this).balance}("");
    require(success, "ETH transfer failed");
  }

  function pause() external onlyOwner {
    _pause();
  }

  function unpause() external onlyOwner {
    _unpause();
  }
}
"
    }
  },
  "settings": {
    "optimizer": {
      "enabled": true,
      "runs": 200
    },
    "evmVersion": "paris",
    "outputSelection": {
      "*": {
        "*": [
          "evm.bytecode",
          "evm.deployedBytecode",
          "abi"
        ]
      }
    }
  }
}}