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• interface IDGTXToken
•    - function transfer(address to, uint va ...
•    - function balanceOf(address)
• interface IWhitelist
•    - function approved(address user)
• interface ITreasury
•    - function phaseNum()
•  contract Sale *
•    - function()
•    - function updateRate(uint256 newRate)
•    - function withdraw()
•    - function withdraw(address payable to)
•    - function transferOwnership(address _o ...
•    - function tokenFallback(address, uint ...
•    - function availablePersonal(address us ...
•    - function buy()
•    - function currentRate()
•    - function weiToTokens(uint256 weiAmoun ...
•    - function tokensToWei(uint256 tokensAm ...
•    - function futureRate()
•    - function availableTokens()

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/**
 *Submitted for verification at Etherscan.io on 2019-02-28
*/

pragma solidity 0.5.4;

interface IDGTXToken {
    function transfer(address to, uint value) external returns (bool);
    function balanceOf(address) external view returns (uint256);
}

interface IWhitelist {
    function approved(address user) external view returns (bool);
}

interface ITreasury {
    function phaseNum() external view returns (uint256);
}

contract Sale {
    address public owner;
    address public whitelist;
    address public token;
    address public treasury;

    mapping(address => mapping(uint256 => uint256)) public purchased;

    uint256 internal rate;
    uint256 internal constant RATE_DELIMITER = 1000;
    uint256 internal constant ONE_TOKEN = 1e18; //1 DGTX
    uint256 internal constant PURCHASE_LIMIT = 1e24; //1 000 000 DGTX

    uint256 internal oldRate;
    uint256 internal constant RATE_UPDATE_DELAY = 15 minutes;
    uint256 internal rateBecomesValidAt;

    event Purchase(address indexed buyer, uint256 amount);
    event RateUpdate(uint256 newRate, uint256 rateBecomesValidAt);
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
    event TokensReceived(uint256 amount);

    modifier onlyOwner() {
        require(msg.sender == owner);
        _;
    }

    modifier onlyWhitelisted() {
        require(IWhitelist(whitelist).approved(msg.sender));
        _;
    }

    constructor(address _token, address _whitelist, address _treasury, uint256 _rate) public {
        require(_token != address(0));
        require(_whitelist != address(0));
        require(_treasury != address(0));
        require(_rate != 0);

        owner = msg.sender;
        token = _token;
        whitelist = _whitelist;
        treasury = _treasury;
        rate = _rate;
    }

    function() external payable {
        require(msg.data.length == 0);

        buy();
    }

    function updateRate(uint256 newRate) external onlyOwner {
        require(newRate != 0);

        if (now > rateBecomesValidAt) {
            oldRate = rate;
        }
        rate = newRate;
        rateBecomesValidAt = now + RATE_UPDATE_DELAY;
        emit RateUpdate(newRate, rateBecomesValidAt);
    }

    function withdraw() external onlyOwner {
        require(address(this).balance > 0);

        msg.sender.transfer(address(this).balance);
    }

    function withdraw(address payable to) external onlyOwner {
        require(address(this).balance > 0);

        to.transfer(address(this).balance);
    }

    function transferOwnership(address _owner) external onlyOwner {
        require(_owner != address(0));

        emit OwnershipTransferred(owner, _owner);

        owner = _owner;
    }

    function tokenFallback(address, uint value, bytes calldata) external {
        require(msg.sender == token);

        emit TokensReceived(value);
    }

    function availablePersonal(address user) external view returns (uint256) {
        if (IWhitelist(whitelist).approved(user)) {
            uint256 currentPhase = ITreasury(treasury).phaseNum();
            return PURCHASE_LIMIT - purchased[user][currentPhase];
        }
        return 0;
    }

    function buy() public payable onlyWhitelisted() returns (uint256) {
        uint256 availableTotal = availableTokens();
        require(availableTotal > 0);

        uint256 currentPhase = ITreasury(treasury).phaseNum();
        uint256 personalRestrictions = PURCHASE_LIMIT - purchased[msg.sender][currentPhase];
        require(personalRestrictions > 0);

        uint256 amount = weiToTokens(msg.value);
        require(amount >= ONE_TOKEN); // 1 DGTX

        // actual = min(amount, availableTotal, availablePersonal)
        uint256 actual = amount < availableTotal ? amount : availableTotal;
        actual = actual < personalRestrictions ? actual : personalRestrictions;

        purchased[msg.sender][currentPhase] += actual;

        require(IDGTXToken(token).transfer(msg.sender, actual));

        if (amount != actual) {
            uint256 weiRefund = msg.value - tokensToWei(actual);
            msg.sender.transfer(weiRefund);
        }

        emit Purchase(msg.sender, actual);

        return actual;
    }

    function currentRate() public view returns (uint256) {
        return (now < rateBecomesValidAt) ? oldRate : rate;
    }

    function weiToTokens(uint256 weiAmount) public view returns (uint256) {
        uint256 exchangeRate = currentRate();

        return weiAmount * exchangeRate / RATE_DELIMITER;
    }

    function tokensToWei(uint256 tokensAmount) public view returns (uint256) {
        uint256 exchangeRate = currentRate();

        return tokensAmount * RATE_DELIMITER / exchangeRate;
    }

    function futureRate() public view returns (uint256, uint256) {
        return (now < rateBecomesValidAt) ? (rate, rateBecomesValidAt - now) : (rate, 0);
    }

    function availableTokens() public view returns (uint256) {
        return IDGTXToken(token).balanceOf(address(this));
    }
}

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[{"constant":false,"inputs":[],"name":"withdraw","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"to","type":"address"}],"name":"withdraw","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"weiAmount","type":"uint256"}],"name":"weiToTokens","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"treasury","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"futureRate","outputs":[{"name":"","type":"uint256"},{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"availableTokens","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"newRate","type":"uint256"}],"name":"updateRate","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"tokensAmount","type":"uint256"}],"name":"tokensToWei","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"owner","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"whitelist","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"buy","outputs":[{"name":"","type":"uint256"}],"payable":true,"stateMutability":"payable","type":"function"},{"constant":true,"inputs":[{"name":"user","type":"address"}],"name":"availablePersonal","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"","type":"address"},{"name":"value","type":"uint256"},{"name":"","type":"bytes"}],"name":"tokenFallback","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"","type":"address"},{"name":"","type":"uint256"}],"name":"purchased","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_owner","type":"address"}],"name":"transferOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"currentRate","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"token","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"inputs":[{"name":"_token","type":"address"},{"name":"_whitelist","type":"address"},{"name":"_treasury","type":"address"},{"name":"_rate","type":"uint256"}],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"payable":true,"stateMutability":"payable","type":"fallback"},{"anonymous":false,"inputs":[{"indexed":true,"name":"buyer","type":"address"},{"indexed":false,"name":"amount","type":"uint256"}],"name":"Purchase","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"newRate","type":"uint256"},{"indexed":false,"name":"rateBecomesValidAt","type":"uint256"}],"name":"RateUpdate","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"previousOwner","type":"address"},{"indexed":true,"name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"amount","type":"uint256"}],"name":"TokensReceived","type":"event"}]

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0000000000000000000000001c83501478f1320977047008496dacbd60bb15ef000000000000000000000000371a6a413fd23c5c906180769b87701d3be624a8000000000000000000000000099a9f22d1bcb5a90e0b8fa0cb0fc47350f113ea00000000000000000000000000000000000000000000000000000000000186a0

-----Decoded View---------------
Arg [0] : _token (address): 0x1C83501478f1320977047008496DACBD60Bb15ef
Arg [1] : _whitelist (address): 0x371A6a413fd23c5c906180769b87701d3BE624A8
Arg [2] : _treasury (address): 0x099a9f22D1bcB5A90E0B8fa0Cb0fC47350F113ea
Arg [3] : _rate (uint256): 100000

-----Encoded View---------------
4 Constructor Arguments found :
Arg [0] : 0000000000000000000000001c83501478f1320977047008496dacbd60bb15ef
Arg [1] : 000000000000000000000000371a6a413fd23c5c906180769b87701d3be624a8
Arg [2] : 000000000000000000000000099a9f22d1bcb5a90e0b8fa0cb0fc47350f113ea
Arg [3] : 00000000000000000000000000000000000000000000000000000000000186a0

bzzr://28f4018d4a7008260b949b05c4486958d6c35e550deac0a46a314f9f5815b05e