Contract Address Details

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(
        uint256 a,
        uint256 b
    ) internal pure returns (bool, uint256) {
        unchecked {
            uint256 c = a + b;
            if (c < a) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(
        uint256 a,
        uint256 b
    ) internal pure returns (bool, uint256) {
        unchecked {
            if (b > a) return (false, 0);
            return (true, a - b);
        }
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(
        uint256 a,
        uint256 b
    ) internal pure returns (bool, uint256) {
        unchecked {
            // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
            // benefit is lost if 'b' is also tested.
            // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
            if (a == 0) return (true, 0);
            uint256 c = a * b;
            if (c / a != b) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(
        uint256 a,
        uint256 b
    ) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a / b);
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(
        uint256 a,
        uint256 b
    ) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a % b);
        }
    }

    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        return a + b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return a - b;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        return a * b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator.
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b <= a, errorMessage);
            return a - b;
        }
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a / b;
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a % b;
        }
    }
}

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;
    }
}

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;
    }
}

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);
    }
}

contract walletRouletteSpin is Ownable, ReentrancyGuard {
    using SafeMath for uint256;

    bytes32 private signKey10Spins;
    bytes32 private signKey20Spins;
    bytes32 private signKey50Spins;
    bytes32 private signKey100Spins;
    bytes32 private signKey250Spins;
    uint256 private usdTransfered = 0;
    uint256 private RLTSold = 0;
    uint256 public fumaInUSD = 2000000000000000;

    event keyGenerated(address indexed buyer, uint256 amountFUMA);
    event FUMAReceived(address indexed from, uint256 value);
    mapping(address => bytes32) private signatures;
    mapping(address => bool) public authorizedAddresses;

    modifier onlyAuthorized() {
        require(
            authorizedAddresses[msg.sender],
            "You are not authorized to do that!"
        );
        _;
    }

    constructor(address initialOwner) Ownable(initialOwner) {
        signKey10Spins = generateSignKey(0);
        signKey20Spins = generateSignKey(signKey10Spins);
        signKey50Spins = generateSignKey(signKey20Spins);
        signKey100Spins = generateSignKey(signKey50Spins);
        signKey250Spins = generateSignKey(signKey100Spins);
    }

    function PayableFunction(
        string memory apiKey
    ) external payable nonReentrant {
        require(msg.value != 0, "Amount must be greater than zero");
        generateAPIkey(msg.value, apiKey);
        transferFUMA(owner(), msg.value); // Transfer FUMA to the owner
    }

    function generateSignKey(bytes32 key) internal view returns (bytes32) {
        bytes32 randomness = keccak256(
            abi.encodePacked(
                block.timestamp,
                block.difficulty,
                block.coinbase,
                blockhash(block.number),
                key
            )
        );
        return randomness;
    }

    function generateAPIkey(uint256 FUMAAmount, string memory apiKey) internal {
        require(FUMAAmount > 0, "Amount must be greater than zero");
        require(bytes(apiKey).length > 0, "API key should not be empty");

        // Get FUMA/USD price from Chainlink Price Feed

        // Calculate the number of RLTs based on sent FUMAs and their current price (calculated in Cents because solidity doesnt support float nums)
        uint256 sentFUMACents = FUMAAmount.mul(uint256(fumaInUSD)).div(
            10 ** 34
        ); // FUMAAmount.mul(uint256(1)).div(10**16) for test

        require(sentFUMACents > 0, "Invalid price");
        require(sentFUMACents < 1050, "Invalid price");

        bytes32 signature;

        // Prices are just examples
        if (sentFUMACents > 80 && sentFUMACents <= 120) {
            // around 1$ = 10 Spins
            signature = keccak256(abi.encodePacked(apiKey, signKey10Spins));
            RLTSold = RLTSold.add(10);
        } else if (sentFUMACents > 130 && sentFUMACents <= 170) {
            // around 1.5$ = 20
            signature = keccak256(abi.encode(apiKey, signKey20Spins));
            RLTSold = RLTSold.add(20);
        } else if (sentFUMACents > 280 && sentFUMACents <= 320) {
            // around 3$ = 50
            signature = keccak256(abi.encodePacked(apiKey, signKey50Spins));
            RLTSold = RLTSold.add(50);
        } else if (sentFUMACents > 480 && sentFUMACents <= 520) {
            // around 5$ = 100
            signature = keccak256(abi.encodePacked(apiKey, signKey100Spins));
            RLTSold = RLTSold.add(100);
        } else if (sentFUMACents > 980 && sentFUMACents <= 1020) {
            // around 10$ = 250
            signature = keccak256(abi.encodePacked(apiKey, signKey250Spins));
            RLTSold = RLTSold.add(250);
        } else {
            revert("Invalid number of tokens to buy");
        }
        usdTransfered = usdTransfered.add(sentFUMACents);
        // Emit event
        emit keyGenerated(msg.sender, FUMAAmount);
        signatures[msg.sender] = signature;
    }

    function showSignKeys()
        public
        view
        onlyAuthorized
        returns (bytes32[] memory)
    {
        bytes32[] memory keys = new bytes32[](5);
        keys[0] = signKey10Spins;
        keys[1] = signKey20Spins;
        keys[2] = signKey50Spins;
        keys[3] = signKey100Spins;
        keys[4] = signKey250Spins;
        return keys;
    }

    function showCoinsTransfered()
        external
        view
        onlyAuthorized
        returns (uint256 amount)
    {
        return usdTransfered;
    }

    function showSoldSpins()
        external
        view
        onlyAuthorized
        returns (uint256 amount)
    {
        return RLTSold;
    }

    function showSignature(address _owner) external view returns (bytes32) {
        require(_owner == msg.sender, "You are not the owner of this address!");
        return signatures[msg.sender];
    }

    function generateNewSignKeys() external onlyAuthorized {
        signKey10Spins = generateSignKey(0);
        signKey20Spins = generateSignKey(signKey10Spins);
        signKey50Spins = generateSignKey(signKey20Spins);
        signKey100Spins = generateSignKey(signKey50Spins);
        signKey250Spins = generateSignKey(signKey100Spins);
    }

    function authorizeAddress(address _authorized) external onlyOwner {
        authorizedAddresses[_authorized] = true;
    }

    function revokeAuthorizarion(address _authorized) external onlyOwner {
        authorizedAddresses[_authorized] = false;
    }

    function transferFUMA(address to, uint256 amount) internal {
        require(to != address(0), "Invalid recipient address");
        require(address(this).balance >= amount, "Insufficient FUMA balance");
        (bool success, ) = payable(to).call{value: amount}("");
        require(success, "FUMA transfer failed");
    }

    function changePrice(uint256 _newPrice) public onlyAuthorized {
        require(_newPrice > 0, "Invalid Price");
        fumaInUSD = _newPrice;
    }
}