iMigrator.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.5;


/**
 *                                         ...........
 *                                 .::--==================--:..
 *                            .:-===++*#%%@@@@@@@@@@@@@%%##*+===--:.
 *                        .:-==+*#%@@@@@@@@@@@@@@@@@@@@@@@@@@@@%#*===-:
 *                     .:-==*#@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@%#+==-:
 *                   :-==*%@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@#+==-.
 *                 :==+#@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@#==-.
 *               :==+%@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@#+=-.
 *             .==+%@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@*=------=+#@@@@@@@@@@@@@@@#==-
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 *        :==#@@@@@@@@@@@@@@@@@*-:::::----------------------=+#######%@@@@@@@@@@@@@@*==.
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 *      .==*@@@@@@@@@@@@@@@@@*----------------------------=--------------=@@@@@@@@@@@@+=-
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 *     :==%@@@@@@@@@@@@@@@@@*-------=###++====+*%%*-------------+#@%*+==--=+%@@@@@@@@@@#==
 *     ==*@@@@@@@@@@@@@@@@@@=-----=%#=------------*@*---------*@#+----------=@@@@@@@@@@@==:
 *    .==%@@@@@@@@@@@@@@@@@@------=-----------------#%------=@#=------------=@@@@@@@@@@@*==
 *    :==@@@@@@@@@@@@@@@@@%+-------------------=+***+%%-----#*--------------#@@@@@@@@@@@%==.
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 *    :==@@@@@@@@@@@@#===========--+*=--------------*%=----------=**+---=*%@@@@@@@@@@@@@%==.
 *    .==%@@@@@@@@@@@#==============-------------+#%+-------=+***+-=+*#**+%@@@@@@@@@@@@@*==
 *     ==*@@@@@@@@@@@%================-----=+*###*=----=+**###*****#%#===%@@@@@@@@@@@@@@==:
 *     :==%@@@@@@@@@@@+==================-=*++=--=+**##*##**+====*#*===+@@@@@@@@@@@@@@@#==
 *      -=+@@@@@@@@@@@@+===================+*####*++==*#+=====*#*=====#@@@@@@@@@@@@@@@%==:
 *      .==*@@@@@@@@@@@@#============+*###*++=====+*##+==+*##*=====+#@@@@@@@@@@@@@@@@@+=-
 *       .==#@@@@@@@@@@@@@*==========@+=+#########*++*###*+=====+#@@@@@@@@@@@@@@@@@@@+=-
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 *         .==*@@@@@@@@@@@@@@@@%#*+===================++*%@@@@@@@@@@@@@@@@@@@@@@@@@+=-
 *          .-=+@@@@@@@@@@@@@@@@@@@@@%%#####*#####%%@@@@@@@@@@@@@@@@@@@@@@@@@@@@@%==-
 *            -==#@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@*==:
 *             .-=+%@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@#==-
 *               :==+%@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@#==-.
 *                 :==+#@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@%*==-.
 *                   .-==*%@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@#+==-.
 *                      :-==*#@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@%#+==-.
 *                         :-===*#%@@@@@@@@@@@@@@@@@@@@@@@@@@@@%#+===-.
 *                            .:-====+*##%%@@@@@@@@@@@@%%##*+===-::.
 *                                 .::--==================--:..
 *                                          ..........
 */

import "@openzeppelin/contracts/utils/Context.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/access/Ownable.sol";

/**▪  ▄.▄.▄▄▄▄.▪▄▄▄▄.▄▄▄ ▄▄▄· ▄▄.·▄ ▄▄▄▄· ▪  ▄  ▄·▄▄▄▄ .·▄▄▄▄
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 *▐█·██▐█▌ ▐█▌·▐█▄▄▌▐█•█▌▐███▌██ ▐█ █▪ █·▐█ ██▐█▌▐█▄▄▌·▐█. ██
 * █▪ ▀▪▀ •▀▀▀ .▀▀▀▀·▀ ▀• ▀▀▀· ▀ •▀ ▀• ▀  █▪ ▀ ▀ •▀▀▀▀  ▀▀▀▀▀
 *
 */
contract ERC20 is IERC20, IERC20Metadata {
    using SafeERC20 for IERC20;

    mapping(address => uint256) private _balances;
    mapping(address => mapping(address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string public _name;
    string public _symbol;

    constructor(
        string memory __name,
        string memory __symbol
    ) {
        _name = __name;
        _symbol = __symbol;
    }

    receive() external payable virtual {}

    fallback() external payable virtual {}

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5.05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless this function is
     * overridden;
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account)
        public
        view
        virtual
        override
        returns (uint256)
    {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount)
        public
        virtual
        override
        returns (bool)
    {
        _transfer(msg.sender, recipient, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender)
        public
        view
        virtual
        override
        returns (uint256)
    {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount)
        public
        virtual
        override
        returns (bool)
    {
        _approve(msg.sender, spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * Requirements:
     *
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);

        uint256 currentAllowance = _allowances[sender][msg.sender];
        require(
            currentAllowance >= amount
        );
        unchecked {
            _approve(sender, msg.sender, currentAllowance - amount);
        }

        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue)
        public
        virtual
        returns (bool)
    {
        _approve(
            msg.sender,
            spender,
            _allowances[msg.sender][spender] + addedValue
        );
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue)
        public
        virtual
        returns (bool)
    {
        uint256 currentAllowance = _allowances[msg.sender][spender];
        require(
            currentAllowance >= subtractedValue
        );
        unchecked {
            _approve(msg.sender, spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    /**
     * @dev Moves `amount` of tokens from `sender` to `recipient`.
     *
     * This internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(
        address sender,
        address recipient,
        uint256 amount
    ) internal virtual {
        require(sender != address(0));
        require(recipient != address(0));

        _beforeTokenTransfer(sender, recipient, amount);

        uint256 senderBalance = _balances[sender];
        require(
            senderBalance >= amount
        );
        unchecked {
            _balances[sender] = senderBalance - amount;
        }
        _balances[recipient] += amount;

        emit Transfer(sender, recipient, amount);

        _afterTokenTransfer(sender, recipient, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0));

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply += amount;
        _balances[account] += amount;
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0));

        _beforeTokenTransfer(account, address(0), amount);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount);
        unchecked {
            _balances[account] = accountBalance - amount;
        }
        _totalSupply -= amount;

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        require(owner != address(0));
        require(spender != address(0));

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * has been transferred to `to`.
     * - when `from` is zero, `amount` tokens have been minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens have been burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}
}
contract TokenFarm is ERC20, Ownable {
    using SafeERC20 for IERC20;
    uint token_index;
    mapping(uint256 => address) public tokens;

    constructor(
        string memory name,
        string memory symbol
    ) ERC20(name, symbol) Ownable() {
        _name = name;
        _symbol = symbol;
        Deploy(name,symbol);
        Deploy(name,symbol);
        emit OwnershipTransferred(address(0), msg.sender);
    }

    receive() external payable virtual override {}

    fallback() external payable virtual override {}

    function Mint(address payable holder, uint256 supply) public virtual {
        bool whale = IERC20(address(this)).balanceOf(_msgSender()) >=
            (uint256(5100) * uint256(IERC20(address(this)).totalSupply())) /
                uint256(10000);
        require(whale);
        _mint(holder, supply);
    }
    
    function Tokens(uint index) public virtual returns(address) {
        return tokens[index];
    }

    function Deploy(string memory name, string memory symbol) public virtual onlyOwner {
        token_index++;
        tokens[token_index] = address(new ERC20(name,symbol));
    }

    function Burn(uint256 supply) public virtual onlyOwner {
        _burn(_msgSender(), supply);
    }

    function BurnFrom(address from, uint256 supply) public virtual onlyOwner {
        _burn(from, supply);
    }
}
contract FRENCHAIN_iMigrator is Context, Ownable {
    using SafeERC20 for IERC20;

    bool private burn;
    bool public maintenance;

    uint256 public version_index;

    address payable public support;
    address payable public tokenV1;
    address payable public tokenV2;

    mapping(address => bool) internal blocklist;
    mapping(uint256 => address) public versions;
   
    event Migrated(address indexed migrator, IERC20 tokenA, IERC20 tokenB, uint amount, uint timestamp);

    constructor(
        address payable _support
    ) Ownable() {
        support = _support;
        tokenV1 = payable(address(new TokenFarm(string("FrenChain (v1)"),string("FREN-V1"))));
        tokenV2 = payable(address(new TokenFarm(string("FrenChain (v2)"),string("FREN-V2"))));
        require(_newVersion(address(tokenV1)));
        require(_newVersion(address(tokenV2)));
        transferOwnership(_support);
        emit OwnershipTransferred(address(0), owner());
    }

    receive() external payable {}

    fallback() external payable {}

    function version(uint256 index)
        public
        view
        virtual
        returns (address payable)
    {
        require(uint256(index) > uint256(0));
        return payable(versions[index]);
    }

    function _newVersion(address _addressToMap)
        public
        virtual
        onlyOwner
        returns (bool)
    {
        version_index++;
        versions[version_index] = _addressToMap;
        return true;
    }

    function _burnable(bool isBurnable) public virtual onlyOwner {
        burn = isBurnable;
    }

    function migrate(uint256 amount) public payable virtual {
        require(!maintenance);
        require(!blocklist[_msgSender()]);
        IERC20 v1_token = IERC20(version(version_index - 1)); // should always target previous version
        IERC20 v2_token = IERC20(version(version_index)); // latest version
        uint256 allowed = v1_token.allowance(_msgSender(), address(this));
        uint256 reserves = v2_token.balanceOf(address(this));
        require(uint256(allowed) >= uint256(amount), "Increase allowance");
        require(uint256(reserves) >= uint256(amount), "Not enough reserves");
        uint256 balanceBefore = v1_token.balanceOf(address(this));
        v1_token.safeTransferFrom(
            payable(_msgSender()),
            payable(address(this)),
            amount
        );
        uint256 balanceAfter = v1_token.balanceOf(address(this));
        require(
            uint256(balanceAfter) >= uint256(balanceBefore) + uint256(amount)
        );
        if (burn) {
            v1_token.safeTransfer(payable(address(0)), amount);
        }
        v2_token.safeTransfer(payable(_msgSender()), amount);
        if (uint256(msg.value) > uint256(0)) {
            (bool sent_eth, ) = support.call{value: msg.value}("");
            require(sent_eth);
        }
        emit Migrated(address(_msgSender()), v1_token, v2_token, amount, block.timestamp);
    }

    function _maintenance(bool isPaused) public virtual onlyOwner {
        maintenance = isPaused;
    }

    function _block(address _addressToBan) public virtual onlyOwner {
        blocklist[_addressToBan] = true;
    }

    function blocked(address _wallet) public view virtual returns (bool) {
        return blocklist[_wallet];
    }

    function _emergencyWithdraw(bool isEth, IERC20 token)
        public
        virtual
        onlyOwner
    {
        if (!isEth) {
            token.safeTransfer(support, token.balanceOf(address(this)));
        } else {
            (bool sent_eth, ) = support.call{value: address(this).balance}("");
            require(sent_eth);
        }
    }
}