Topic: (гайд) создаем смарт контракт (Read 411 times)

pragma solidity 0.5.12;

library SafeMath {
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if(a == 0) return 0;
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }

    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: division by zero");
        return a / b;
    }

    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a, "SafeMath: subtraction overflow");
        return a - b;
    }

    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }

    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b != 0, "SafeMath: modulo by zero");
        return a % b;
    }
}

contract Ownable {
    address private _owner;

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

    constructor() internal {
        _owner = msg.sender;
        emit OwnershipTransferred(address(0), _owner);
    }

    function owner() public view returns (address) {
        return _owner;
    }

    modifier onlyOwner() {
        require(isOwner(), "Ownable: caller is not the owner");
        _;
    }

    function isOwner() public view returns (bool) {
        return msg.sender == _owner;
    }

    function renounceOwnership() public onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    function transferOwnership(address newOwner) public onlyOwner {
        _transferOwnership(newOwner);
    }

    function _transferOwnership(address newOwner) internal {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

interface IERC20 {
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);

    function transfer(address to, uint256 value) external returns (bool);
    function approve(address spender, uint256 value) external returns (bool);
    function transferFrom(address from, address to, uint256 value) external returns (bool);
    function totalSupply() external view returns (uint256);
    function balanceOf(address who) external view returns (uint256);
    function allowance(address owner, address spender) external view returns (uint256);
}

contract IERC223Recipient {
    function tokenFallback(address from, uint value, bytes memory data) public;
}

contract Withdrawable is Ownable {
    event WithdrawEther(address indexed to, uint value);

    function withdrawEther(address payable _to, uint _value) onlyOwner public {
        require(_to != address(0));
        require(address(this).balance >= _value);

        address(_to).transfer(_value);

        emit WithdrawEther(_to, _value);
    }

    function withdrawTokensTransfer(IERC20 _token, address _to, uint256 _value) onlyOwner public {
        require(_token.transfer(_to, _value));
    }

    function withdrawTokensTransferFrom(IERC20 _token, address _from, address _to, uint256 _value) onlyOwner public {
        require(_token.transferFrom(_from, _to, _value));
    }

    function withdrawTokensApprove(IERC20 _token, address _spender, uint256 _value) onlyOwner public {
        require(_token.approve(_spender, _value));
    }
}


contract Wallet is Ownable {
    struct WalletItem {
        address payable addr;
        uint percent;
    }

    WalletItem[] public wallets;

    function setWallet(uint _index, address payable _addr, uint _percent) onlyOwner external {
        wallets[_index].addr = _addr;
        wallets[_index].percent = _percent;
    }

    function addWallet(address payable _addr, uint _percent) onlyOwner external {
        wallets.push(WalletItem({addr: _addr, percent: _percent}));
    }
}

contract PaymentSplitter is Wallet, Withdrawable {
    using SafeMath for uint;

    event Operation(address indexed addr, uint256 eth);

    function() payable external {
        for(uint i = 0; i < wallets.length; i++) {
            if(wallets[i].percent > 0) {
                address(wallets[i].addr).transfer(msg.value.mul(wallets[i].percent).div(100));
            }
        }

        emit Operation(msg.sender, msg.value);
    }
}