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

//............................................................................................................................
//.BBBBBBBBBBBBBBBBBBBBBB...........BEEEEEEEEEEEEEEEEEEEEEEEEE.....EEEEEEEEEEEEEEEEEEEEEEEEEE....EPPPPPPPPPPPPPPPPPPPP........
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//............................................................................................................................

import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/utils/cryptography/ECDSA.sol";

contract FairLaunch is ReentrancyGuard, Ownable {
    using ECDSA for bytes32;
    using SafeERC20 for IERC20;

    /* ======== VARIABLES ======== */

    address public token;
    address public whitelistSigner;
    address payable public treasury;

    uint256 public rate;
    uint256 public ethRaised;
    uint256 public endICO;
    uint256 public minPurchase;
    uint256 public maxPurchase;
    uint256 public availableTokensICO;
    uint256 public boughtTokensICO;

    bool public buyActive = true;
    bool public withdrawActive = true;
    bool public whitelistActive = true;

    // bytes32 -> DomainSeparator
    bytes32 public DOMAIN_SEPARATOR;
    // bytes32 -> PRESALE_TYPEHASH
    bytes32 public constant PRESALE_TYPEHASH = keccak256("FairLaunch(address buyer)");

    /* ======== STRUCTS ======== */

    struct Investor {
        address wallet;
        uint256 amountToReceive;
        uint256 ethSpend;
    }

    /* ======== MAPPINGS ======== */

    mapping(address => Investor) public investor;

    /* ======== EVENTS ======== */

    event TokensPurchased(address indexed _beneficiary, address indexed _treasury, uint256 _amount);
    event SetICO(uint256 _block);
    event TokenAddress(address token);
    event WithdrawLeftovers(address _receipent, uint256 _amount);
    event WithdrawRewards(address _receipent, uint256 _amount);
    event MinPurchase(uint256 _amount);
    event MaxPurchase(uint256 _amount);
    event Rate(uint256 _amount);
    event AvailableTokensICO(uint256 _amount);
    event Sales(bool _buyActive, bool _withdrawActive);
    event WhitelistActive(bool _whitelistActive);
    event WhitelistSigner(address _whitelistSigner);
    event Treasury(address payable _amount);

    /* ======== MODIFIERS ======== */

    modifier icoActive() {
        require(endICO > 0 && block.number < endICO && availableTokensICO > 0, "ICO must be active");
        _;
    }
    
    modifier icoNotActive() {
        require(endICO < block.number, 'ICO is active');
        _;
    }

    modifier withdrawIsActive() {
        require(withdrawActive, 'Withdrawing has been paused');
        _;
    }

    modifier buyIsActive() {
        require(buyActive, 'Purchasing has been paused');
        _;
    }

    /* ======== INITIALIZATION ======== */

    constructor (
        address payable _treasury,
        uint256 _rate, 
        uint256 _availableTokensICO,
        uint256 _endICO, 
        uint256 _minPurchase, 
        uint256 _maxPurchase
    ) public {
        uint256 chainId;
        assembly {
            chainId := chainid()
        }

        DOMAIN_SEPARATOR = keccak256(
            abi.encode(
                keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"),
                keccak256(bytes("FairLaunch")),
                keccak256(bytes("1")),
                chainId,
                address(this)
            )
        );

        setRate(_rate);
        setICO(_endICO);
        setMaxPurchase(_maxPurchase);
        setMinPurchase(_minPurchase);
        setAvailableTokensICO(_availableTokensICO);
        setWhitelistSigner(_msgSender());
        setTreasury(_treasury);
    }
    
    /* ======== SETTERS ======== */

    /**
    * @notice Set the new end ICO, when setting this to 0 the ico will be done
    * @param _whitelistActive Sets the whitelist active or not
    */
    function setWhitelistActive(bool _whitelistActive) public onlyOwner {
        whitelistActive = _whitelistActive;

        emit WhitelistActive(_whitelistActive);
    }

    /**
    * @notice Set the new signer of the whitelisters
    * @param _whitelistSigner The new whitelist signer
    */
    function setWhitelistSigner(address _whitelistSigner) public onlyOwner {
        whitelistSigner = _whitelistSigner;

        emit WhitelistSigner(_whitelistSigner);
    }

    /**
    * @notice Set the new end ICO, when setting this to 0 the ico will be done
    * @param _ICO The end ico block
    */
    function setICO(uint256 _ICO) public onlyOwner {
        endICO = _ICO;

        emit SetICO(_ICO);
    }

    /**
    * @notice Set Token Address
    * @param _token The token address the presale is about
    */
    function setToken(address _token) public onlyOwner {
        require(_token != address(0x0), "FairLaunch: Token is the zero address");
        token = _token;

        emit TokenAddress(_token);
    }

    /**
    * @notice Sets the new rate
    * @param _rate The rate in (Gwei)
    */
    function setRate(uint256 _rate) public onlyOwner {
        require(_rate > 0, "FairLaunch: Cannot be 0");
        rate = _rate;

        emit Rate(rate);
    }
    
    /**
    * @notice Sets the available tokens
    * @param _availableTokensICO the available tokens in gwei
    */
    function setAvailableTokensICO(uint256 _availableTokensICO) public onlyOwner {
        availableTokensICO = _availableTokensICO;

        emit AvailableTokensICO(_availableTokensICO);
    }
    
    /**
    * @notice Sets the new receiver of the funds
    * @param _treasury The address that will receive the presale funds
    */
    function setTreasury(address payable _treasury) public onlyOwner {
        require(_treasury != address(0), "FairLaunch: Invalid address");
        treasury = _treasury;
        
        emit Treasury(treasury);
    }
    
    /**
    * @notice Sets the new min purchase 
    * @param _minPurchase The new min purchase in (Gwei)
    */
    function setMinPurchase(uint256 _minPurchase) public onlyOwner {
        minPurchase = _minPurchase;

        emit MinPurchase(_minPurchase);
    }

    /**
    * @notice Sets the new max purchase 
    * @param _maxPurchase The new max purchase in (Gwei)
    */
    function setMaxPurchase(uint256 _maxPurchase) public onlyOwner {
        maxPurchase = _maxPurchase;

        emit MaxPurchase(_maxPurchase);
    }

    /**
    * @notice Sets the activity of buy / withdraw 
    * @param _buyActive Enable or disable the buy activity
    * @param _withdrawActive Enable or disable the withdraw activty
    */
    function setSales(bool _buyActive, bool _withdrawActive) public onlyOwner {
        buyActive = _buyActive;
        withdrawActive = _withdrawActive;

        emit Sales(_buyActive, _withdrawActive);
    }

    /* ======== GETTERS ======== */

    /**
    * @notice Returns the token amount based on the rewardTokenCount and the rate
    * @param _weiAmount The amount of tokens in wei
    */
    function getTokenAmount(uint256 _weiAmount) public view returns (uint256) {
        return (_weiAmount * rate) / 1E18;
    }

    /**
    * @notice Returns the amount of tokens in the contract
    */
    function getTokensInContract() public view returns (uint256) {
        return IERC20(token).balanceOf(address(this));
    }

    /**
    * @notice Returns the amount the user can withdraw after the ICO has ended
    * @param _beneficiary The wallet address for distributed amount
    */
    function withdrawalAmount(address _beneficiary) public view returns (uint256 amount) {
        return investor[_beneficiary].amountToReceive;
    }

    /* ======== CALLABLE FUNCTIONS ======== */

    /**
    * @notice deposit the tokens which will be claimed
    */
    function depositTokens(uint256 amount) external onlyOwner {
        IERC20(token).transferFrom(_msgSender(), address(this), amount);
    }

    /**
    * @notice If the ICO is not active anymore, the owner can withdraw the leftovers
    */
    function withdrawLeftoversToken() external icoNotActive onlyOwner {
        require(IERC20(token).balanceOf(address(this)) > 0, 'FairLaunch: There are no tokens to withdraw');
        IERC20(token).safeTransfer(_msgSender(), IERC20(token).balanceOf(address(this)));

        emit WithdrawLeftovers(_msgSender(), IERC20(token).balanceOf(address(this)));
    }

    /**
    * @notice Users can withdraw only when the ICO is ended and the amount is not equal to 0
    */
    function withdrawTokens() external nonReentrant icoNotActive withdrawIsActive {
        require(token != address(0), "FairLaunch: Token is the zero address");
        require(withdrawalAmount(_msgSender()) != 0, "FairLaunch: Haven't bought any tokens");
        require(withdrawalAmount(_msgSender()) <= getTokensInContract(), "FairLaunch: Not enough tokens in contract to withdraw from");

        uint256 amountToWithdraw = withdrawalAmount(_msgSender());
        investor[_msgSender()].amountToReceive = 0;

        IERC20(token).safeTransfer(_msgSender(), amountToWithdraw);

        emit WithdrawRewards(_msgSender(), amountToWithdraw);
    }

    /**
    * @notice Buy tokens
    */
    function buyTokens(bytes memory _signature) external nonReentrant icoActive buyIsActive payable {
        require(availableTokensICO != 0, "FairLaunch: No available tokens left");
        if(whitelistActive) {
            bytes32 digest = keccak256(abi.encodePacked("\x19\x01", DOMAIN_SEPARATOR, keccak256(abi.encode(PRESALE_TYPEHASH, _msgSender()))));
            address recoveredAddress = digest.recover(_signature);
            require(recoveredAddress != address(0) && recoveredAddress == address(whitelistSigner), "Invalid signature");
        }

        uint256 ethPurchaseInWei = msg.value;
        uint256 tokensPurchase = getTokenAmount(ethPurchaseInWei);
        require(ethPurchaseInWei >= minPurchase, 'FairLaunch: Have to send at least minPurchase');
        require(tokensPurchase != 0, "FairLaunch: Value is 0");
        require(tokensPurchase <= availableTokensICO, "FairLaunch: No tokens left for purchase");
        require((investor[_msgSender()].ethSpend + ethPurchaseInWei) <= maxPurchase, 'FairLaunch: Max purchase has been reached');

        // Amount of ETH that has been raised
        ethRaised += ethPurchaseInWei;

        // Add person to distributed map and tokens bought
        investor[_msgSender()].wallet = _msgSender();
        investor[_msgSender()].amountToReceive += tokensPurchase;
        investor[_msgSender()].ethSpend += ethPurchaseInWei;
    
        availableTokensICO = availableTokensICO - tokensPurchase;
        boughtTokensICO += tokensPurchase;

        treasury.transfer(ethPurchaseInWei);

        emit TokensPurchased(_msgSender(), treasury, tokensPurchase);
    }
}

// SPDX-License-Identifier: MIT

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 make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}

// SPDX-License-Identifier: MIT

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() {
        _setOwner(_msgSender());
    }

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

    /**
     * @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 {
        _setOwner(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");
        _setOwner(newOwner);
    }

    function _setOwner(address newOwner) private {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using Address for address;

    function safeTransfer(
        IERC20 token,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(
        IERC20 token,
        address from,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance = token.allowance(address(this), spender) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            uint256 newAllowance = oldAllowance - value;
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
        }
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) {
            // Return data is optional
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations.
 *
 * These functions can be used to verify that a message was signed by the holder
 * of the private keys of a given address.
 */
library ECDSA {
    enum RecoverError {
        NoError,
        InvalidSignature,
        InvalidSignatureLength,
        InvalidSignatureS,
        InvalidSignatureV
    }

    function _throwError(RecoverError error) private pure {
        if (error == RecoverError.NoError) {
            return; // no error: do nothing
        } else if (error == RecoverError.InvalidSignature) {
            revert("ECDSA: invalid signature");
        } else if (error == RecoverError.InvalidSignatureLength) {
            revert("ECDSA: invalid signature length");
        } else if (error == RecoverError.InvalidSignatureS) {
            revert("ECDSA: invalid signature 's' value");
        } else if (error == RecoverError.InvalidSignatureV) {
            revert("ECDSA: invalid signature 'v' value");
        }
    }

    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature` or error string. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {toEthSignedMessageHash} on it.
     *
     * Documentation for signature generation:
     * - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js]
     * - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers]
     *
     * _Available since v4.3._
     */
    function tryRecover(bytes32 hash, bytes memory signature) internal pure returns (address, RecoverError) {
        // Check the signature length
        // - case 65: r,s,v signature (standard)
        // - case 64: r,vs signature (cf https://eips.ethereum.org/EIPS/eip-2098) _Available since v4.1._
        if (signature.length == 65) {
            bytes32 r;
            bytes32 s;
            uint8 v;
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            assembly {
                r := mload(add(signature, 0x20))
                s := mload(add(signature, 0x40))
                v := byte(0, mload(add(signature, 0x60)))
            }
            return tryRecover(hash, v, r, s);
        } else if (signature.length == 64) {
            bytes32 r;
            bytes32 vs;
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            assembly {
                r := mload(add(signature, 0x20))
                vs := mload(add(signature, 0x40))
            }
            return tryRecover(hash, r, vs);
        } else {
            return (address(0), RecoverError.InvalidSignatureLength);
        }
    }

    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature`. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {toEthSignedMessageHash} on it.
     */
    function recover(bytes32 hash, bytes memory signature) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, signature);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `r` and `vs` short-signature fields separately.
     *
     * See https://eips.ethereum.org/EIPS/eip-2098[EIP-2098 short signatures]
     *
     * _Available since v4.3._
     */
    function tryRecover(
        bytes32 hash,
        bytes32 r,
        bytes32 vs
    ) internal pure returns (address, RecoverError) {
        bytes32 s;
        uint8 v;
        assembly {
            s := and(vs, 0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff)
            v := add(shr(255, vs), 27)
        }
        return tryRecover(hash, v, r, s);
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `r and `vs` short-signature fields separately.
     *
     * _Available since v4.2._
     */
    function recover(
        bytes32 hash,
        bytes32 r,
        bytes32 vs
    ) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, r, vs);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `v`,
     * `r` and `s` signature fields separately.
     *
     * _Available since v4.3._
     */
    function tryRecover(
        bytes32 hash,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal pure returns (address, RecoverError) {
        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature
        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines
        // the valid range for s in (301): 0 < s < secp256k1n ÷ 2 + 1, and for v in (302): v ∈ {27, 28}. Most
        // signatures from current libraries generate a unique signature with an s-value in the lower half order.
        //
        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value
        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or
        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept
        // these malleable signatures as well.
        if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) {
            return (address(0), RecoverError.InvalidSignatureS);
        }
        if (v != 27 && v != 28) {
            return (address(0), RecoverError.InvalidSignatureV);
        }

        // If the signature is valid (and not malleable), return the signer address
        address signer = ecrecover(hash, v, r, s);
        if (signer == address(0)) {
            return (address(0), RecoverError.InvalidSignature);
        }

        return (signer, RecoverError.NoError);
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `v`,
     * `r` and `s` signature fields separately.
     */
    function recover(
        bytes32 hash,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, v, r, s);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Returns an Ethereum Signed Message, created from a `hash`. This
     * produces hash corresponding to the one signed with the
     * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]
     * JSON-RPC method as part of EIP-191.
     *
     * See {recover}.
     */
    function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32) {
        // 32 is the length in bytes of hash,
        // enforced by the type signature above
        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash));
    }

    /**
     * @dev Returns an Ethereum Signed Typed Data, created from a
     * `domainSeparator` and a `structHash`. This produces hash corresponding
     * to the one signed with the
     * https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`]
     * JSON-RPC method as part of EIP-712.
     *
     * See {recover}.
     */
    function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked("\x19\x01", domainSeparator, structHash));
    }
}

// SPDX-License-Identifier: MIT

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;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @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);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

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

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"address payable","name":"_treasury","type":"address"},{"internalType":"uint256","name":"_rate","type":"uint256"},{"internalType":"uint256","name":"_availableTokensICO","type":"uint256"},{"internalType":"uint256","name":"_endICO","type":"uint256"},{"internalType":"uint256","name":"_minPurchase","type":"uint256"},{"internalType":"uint256","name":"_maxPurchase","type":"uint256"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"AvailableTokensICO","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"MaxPurchase","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"MinPurchase","type":"event"},{"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":false,"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"Rate","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"bool","name":"_buyActive","type":"bool"},{"indexed":false,"internalType":"bool","name":"_withdrawActive","type":"bool"}],"name":"Sales","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"_block","type":"uint256"}],"name":"SetICO","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"token","type":"address"}],"name":"TokenAddress","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"_beneficiary","type":"address"},{"indexed":true,"internalType":"address","name":"_treasury","type":"address"},{"indexed":false,"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"TokensPurchased","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address payable","name":"_amount","type":"address"}],"name":"Treasury","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"bool","name":"_whitelistActive","type":"bool"}],"name":"WhitelistActive","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"_whitelistSigner","type":"address"}],"name":"WhitelistSigner","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"_receipent","type":"address"},{"indexed":false,"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"WithdrawLeftovers","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"_receipent","type":"address"},{"indexed":false,"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"WithdrawRewards","type":"event"},{"inputs":[],"name":"DOMAIN_SEPARATOR","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"PRESALE_TYPEHASH","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"availableTokensICO","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"boughtTokensICO","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"buyActive","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes","name":"_signature","type":"bytes"}],"name":"buyTokens","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"depositTokens","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"endICO","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"ethRaised","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_weiAmount","type":"uint256"}],"name":"getTokenAmount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getTokensInContract","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"investor","outputs":[{"internalType":"address","name":"wallet","type":"address"},{"internalType":"uint256","name":"amountToReceive","type":"uint256"},{"internalType":"uint256","name":"ethSpend","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"maxPurchase","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"minPurchase","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"rate","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_availableTokensICO","type":"uint256"}],"name":"setAvailableTokensICO","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_ICO","type":"uint256"}],"name":"setICO","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_maxPurchase","type":"uint256"}],"name":"setMaxPurchase","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_minPurchase","type":"uint256"}],"name":"setMinPurchase","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_rate","type":"uint256"}],"name":"setRate","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bool","name":"_buyActive","type":"bool"},{"internalType":"bool","name":"_withdrawActive","type":"bool"}],"name":"setSales","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_token","type":"address"}],"name":"setToken","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address payable","name":"_treasury","type":"address"}],"name":"setTreasury","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bool","name":"_whitelistActive","type":"bool"}],"name":"setWhitelistActive","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_whitelistSigner","type":"address"}],"name":"setWhitelistSigner","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"token","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"treasury","outputs":[{"internalType":"address payable","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"whitelistActive","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"whitelistSigner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"withdrawActive","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"withdrawLeftoversToken","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"withdrawTokens","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_beneficiary","type":"address"}],"name":"withdrawalAmount","outputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"stateMutability":"view","type":"function"}]

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000000000000000000000000f915785502c7cd1716c20c79dadad1f01d3bc94d00000000000000000000000000000000000000006518e99e9474881fd1fe0000000000000000000000000000000000000000001bcbb129cfd7e2d0e53fe000000000000000000000000000000000000000000000000000000000000005f5e0ff000000000000000000000000000000000000000000000000016345785d8a000000000000000000000000000000000000000000000000000004c9afac0f828000

-----Decoded View---------------
Arg [0] : _treasury (address): 0xF915785502C7cd1716c20C79DaDAD1f01d3BC94d
Arg [1] : _rate (uint256): 31288103448300000000000000000
Arg [2] : _availableTokensICO (uint256): 2202200022200000000000000000000
Arg [3] : _endICO (uint256): 99999999
Arg [4] : _minPurchase (uint256): 100000000000000000
Arg [5] : _maxPurchase (uint256): 345000000000000000

-----Encoded View---------------
6 Constructor Arguments found :
Arg [0] : 000000000000000000000000f915785502c7cd1716c20c79dadad1f01d3bc94d
Arg [1] : 00000000000000000000000000000000000000006518e99e9474881fd1fe0000
Arg [2] : 000000000000000000000000000000000000001bcbb129cfd7e2d0e53fe00000
Arg [3] : 0000000000000000000000000000000000000000000000000000000005f5e0ff
Arg [4] : 000000000000000000000000000000000000000000000000016345785d8a0000
Arg [5] : 00000000000000000000000000000000000000000000000004c9afac0f828000