stm-contract-improvements.sol

pragma solidity 0.4.24;

/**
 * @title SafeMath
 * @dev Math operations with safety checks that throw on error
 */
library SafeMath {

  /**
  * @dev Multiplies two numbers, throws on overflow.
  */
  function mul(uint256 a, uint256 b) internal pure returns (uint256 c) {
    // Gas optimization: this is cheaper than asserting 'a' not being zero, but the
    // benefit is lost if 'b' is also tested.
    // See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522
    if (a == 0) {
      return 0;
    }

    c = a * b;
    assert(c / a == b);
    return c;
  }

  /**
  * @dev Integer division of two numbers, truncating the quotient.
  */
  function div(uint256 a, uint256 b) internal pure returns (uint256) {
    // assert(b > 0); // Solidity automatically throws when dividing by 0
    // uint256 c = a / b;
    // assert(a == b * c + a % b); // There is no case in which this doesn't hold
    return a / b;
  }

  /**
  * @dev Subtracts two numbers, throws on overflow (i.e. if subtrahend is greater than minuend).
  */
  function sub(uint256 a, uint256 b) internal pure returns (uint256) {
    assert(b <= a);
    return a - b;
  }

  /**
  * @dev Adds two numbers, throws on overflow.
  */
  function add(uint256 a, uint256 b) internal pure returns (uint256 c) {
    c = a + b;
    assert(c >= a);
    return c;
  }
}

/**
 * @title ERC20Basic
 * @dev Simpler version of ERC20 interface
 * See https://github.com/ethereum/EIPs/issues/179
 */
contract ERC20Basic {
  function totalSupply() public view returns (uint256);
  function balanceOf(address who) public view returns (uint256);
  function transfer(address to, uint256 value) public returns (bool);
  event Transfer(address indexed from, address indexed to, uint256 value);
}

/**
 * @title ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/20
 */
contract ERC20 is ERC20Basic {
  function allowance(address owner, address spender)
    public view returns (uint256);

  function transferFrom(address from, address to, uint256 value)
    public returns (bool);

  function approve(address spender, uint256 value) public returns (bool);
  event Approval(
    address indexed owner,
    address indexed spender,
    uint256 value
  );
}

/**
 * @title Basic token
 * @dev Basic version of StandardToken, with no allowances.
 */
contract BasicToken is ERC20Basic {
  using SafeMath for uint256;

  mapping(address => uint256) balances;

  uint256 totalSupply_;

  /**
  * @dev Total number of tokens in existence
  */
  function totalSupply() public view returns (uint256) {
    return totalSupply_;
  }

  /**
  * @dev Transfer token for a specified address
  * @param _to The address to transfer to.
  * @param _value The amount to be transferred.
  */
  function transfer(address _to, uint256 _value) public returns (bool) {
    require(_value <= balances[msg.sender]);
    require(_to != address(0));

    balances[msg.sender] = balances[msg.sender].sub(_value);
    balances[_to] = balances[_to].add(_value);
    emit Transfer(msg.sender, _to, _value);
    return true;
  }

  /**
  * @dev Gets the balance of the specified address.
  * @param _owner The address to query the the balance of.
  * @return An uint256 representing the amount owned by the passed address.
  */
  function balanceOf(address _owner) public view returns (uint256) {
    return balances[_owner];
  }

}

/**
 * @title Burnable Token
 * @dev Token that can be irreversibly burned (destroyed).
 */
contract BurnableToken is BasicToken {

  event Burn(address indexed burner, uint256 value);

  /**
   * @dev Burns a specific amount of tokens.
   * @param _value The amount of token to be burned.
   */
  function burn(uint256 _value) public {
    _burn(msg.sender, _value);
  }

  function _burn(address _who, uint256 _value) internal {
    require(_value <= balances[_who]);
    // no need to require value <= totalSupply, since that would imply the
    // sender's balance is greater than the totalSupply, which *should* be an assertion failure

    balances[_who] = balances[_who].sub(_value);
    totalSupply_ = totalSupply_.sub(_value);
    emit Burn(_who, _value);
    emit Transfer(_who, address(0), _value);
  }
}

/**
 * @title Standard ERC20 token
 *
 * @dev Implementation of the basic standard token.
 * https://github.com/ethereum/EIPs/issues/20
 * Based on code by FirstBlood: https://github.com/Firstbloodio/token/blob/master/smart_contract/FirstBloodToken.sol
 */
contract StandardToken is ERC20, BurnableToken {

  mapping (address => mapping (address => uint256)) internal allowed;


  /**
   * @dev Transfer tokens from one address to another
   * @param _from address The address which you want to send tokens from
   * @param _to address The address which you want to transfer to
   * @param _value uint256 the amount of tokens to be transferred
   */
  function transferFrom(
    address _from,
    address _to,
    uint256 _value
  )
    public
    returns (bool)
  {
    require(_value <= balances[_from]);
    require(_value <= allowed[_from][msg.sender]);
    require(_to != address(0));

    balances[_from] = balances[_from].sub(_value);
    balances[_to] = balances[_to].add(_value);
    allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
    emit Transfer(_from, _to, _value);
    return true;
  }

  /**
   * @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.
   * 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
   * @param _spender The address which will spend the funds.
   * @param _value The amount of tokens to be spent.
   */
  function approve(address _spender, uint256 _value) public returns (bool) {
    allowed[msg.sender][_spender] = _value;
    emit Approval(msg.sender, _spender, _value);
    return true;
  }

  /**
   * @dev Function to check the amount of tokens that an owner allowed to a spender.
   * @param _owner address The address which owns the funds.
   * @param _spender address The address which will spend the funds.
   * @return A uint256 specifying the amount of tokens still available for the spender.
   */
  function allowance(
    address _owner,
    address _spender
   )
    public
    view
    returns (uint256)
  {
    return allowed[_owner][_spender];
  }

  /**
   * @dev Increase the amount of tokens that an owner allowed to a spender.
   * approve should be called when allowed[_spender] == 0. To increment
   * allowed value is better to use this function to avoid 2 calls (and wait until
   * the first transaction is mined)
   * From MonolithDAO Token.sol
   * @param _spender The address which will spend the funds.
   * @param _addedValue The amount of tokens to increase the allowance by.
   */
  function increaseApproval(
    address _spender,
    uint256 _addedValue
  )
    public
    returns (bool)
  {
    allowed[msg.sender][_spender] = (
      allowed[msg.sender][_spender].add(_addedValue));
    emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
    return true;
  }

  /**
   * @dev Decrease the amount of tokens that an owner allowed to a spender.
   * approve should be called when allowed[_spender] == 0. To decrement
   * allowed value is better to use this function to avoid 2 calls (and wait until
   * the first transaction is mined)
   * From MonolithDAO Token.sol
   * @param _spender The address which will spend the funds.
   * @param _subtractedValue The amount of tokens to decrease the allowance by.
   */
  function decreaseApproval(
    address _spender,
    uint256 _subtractedValue
  )
    public
    returns (bool)
  {
    uint256 oldValue = allowed[msg.sender][_spender];
    if (_subtractedValue >= oldValue) {
      allowed[msg.sender][_spender] = 0;
    } else {
      allowed[msg.sender][_spender] = oldValue.sub(_subtractedValue);
    }
    emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
    return true;
  }

}

/**
 * @title Standard Burnable Token
 * @dev Adds burnFrom method to ERC20 implementations
 */
contract StandardBurnableToken is StandardToken {

  /**
   * @dev Burns a specific amount of tokens from the target address and decrements allowance
   * @param _from address The address which you want to send tokens from
   * @param _value uint256 The amount of token to be burned
   */
  function burnFrom(address _from, uint256 _value) public {
    require(_value <= allowed[_from][msg.sender]);
    // Should https://github.com/OpenZeppelin/zeppelin-solidity/issues/707 be accepted,
    // this function needs to emit an event with the updated approval.
    allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
    _burn(_from, _value);
  }
}

/**
 * @title Ownable
 * @dev The Ownable contract has an owner address, and provides basic authorization control
 * functions, this simplifies the implementation of "user permissions".
 */
contract Ownable {
  address public owner;


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


  /**
   * @dev The Ownable constructor sets the original `owner` of the contract to the sender
   * account.
   */
  constructor() public {
    owner = msg.sender;
  }

  /**
   * @dev Throws if called by any account other than the owner.
   */
  modifier onlyOwner() {
    require(msg.sender == owner);
    _;
  }

  /**
   * @dev Allows the current owner to relinquish control of the contract.
   * @notice Renouncing to ownership will leave the contract without an owner.
   * It will not be possible to call the functions with the `onlyOwner`
   * modifier anymore.
   */
  function renounceOwnership() public onlyOwner {
    emit OwnershipRenounced(owner);
    owner = address(0);
  }

  /**
   * @dev Allows the current owner to transfer control of the contract to a newOwner.
   * @param _newOwner The address to transfer ownership to.
   */
  function transferOwnership(address _newOwner) public onlyOwner {
    _transferOwnership(_newOwner);
  }

  /**
   * @dev Transfers control of the contract to a newOwner.
   * @param _newOwner The address to transfer ownership to.
   */
  function _transferOwnership(address _newOwner) internal {
    require(_newOwner != address(0));
    emit OwnershipTransferred(owner, _newOwner);
    owner = _newOwner;
  }
}

/**
 * @title Pausable
 * @dev Base contract which allows children to implement an emergency stop mechanism.
 */
contract Pausable is Ownable {
  event Pause();
  event Unpause();

  bool public paused = false;


  /**
   * @dev Modifier to make a function callable only when the contract is not paused.
   */
  modifier whenNotPaused() {
    require(!paused);
    _;
  }

  /**
   * @dev Modifier to make a function callable only when the contract is paused.
   */
  modifier whenPaused() {
    require(paused);
    _;
  }

  /**
   * @dev called by the owner to pause, triggers stopped state
   */
  function pause() onlyOwner whenNotPaused public {
    paused = true;
    emit Pause();
  }

  /**
   * @dev called by the owner to unpause, returns to normal state
   */
  function unpause() onlyOwner whenPaused public {
    paused = false;
    emit Unpause();
  }
}

/**
 * @title Pausable token
 * @dev StandardToken modified with pausable transfers.
 **/
contract PausableToken is StandardBurnableToken, Pausable {

  function transfer(
    address _to,
    uint256 _value
  )
    public
    whenNotPaused
    returns (bool)
  {
    return super.transfer(_to, _value);
  }

  function transferFrom(
    address _from,
    address _to,
    uint256 _value
  )
    public
    whenNotPaused
    returns (bool)
  {
    return super.transferFrom(_from, _to, _value);
  }

  function approve(
    address _spender,
    uint256 _value
  )
    public
    whenNotPaused
    returns (bool)
  {
    return super.approve(_spender, _value);
  }

  function increaseApproval(
    address _spender,
    uint _addedValue
  )
    public
    whenNotPaused
    returns (bool success)
  {
    return super.increaseApproval(_spender, _addedValue);
  }

  function decreaseApproval(
    address _spender,
    uint _subtractedValue
  )
    public
    whenNotPaused
    returns (bool success)
  {
    return super.decreaseApproval(_spender, _subtractedValue);
  }
}

contract Streamity is PausableToken {
    
    string public constant name = "Streamity";
    string public constant symbol = "STM";
    uint8 public constant decimals = 18;

    uint256 public constant INITIAL_SUPPLY = 180000000 * (10 ** uint256(decimals));


    address public tokenOwner = 0x464398aC8B96DdAd7e22AC37147822E1c69293Cb;
    
    address public reserveFund = 0x84726199Ac1579684d58F4A47C4c85f2C45B5a11;
    address public advisersPartners = 0xa2C2f149e4b3EC671a61EAc9F12eAF2489e0Fb10;
    
    address public teamWallet1 = 0xbBB9E0605f0BC7Af1B7238bAC2807a3A8DCb54b5;
    
    address public teamWallet2 = 0xd69824B62D26E7f2316812b8c59F36328196Ca13;
    
    
    
    constructor () public {
        totalSupply_ = INITIAL_SUPPLY;
        
        balances[tokenOwner] = 129780000 ether; // For distrebution
        balances[address(this)] = 50220000 ether; // For freezing
        
        emit Transfer(address(0), tokenOwner, 129780000 ether);
        emit Transfer(address(0), address(this), 50220000 ether);
    }
    
    uint teamObligationPart1 = 4650000 ether;
    uint advisersPartnersObligation = 3720000 ether;
    
    function ReleaseTokenForReserveFund () public onlyOwner {
        // 25 september 2018 y.
        require(now >= 1537833600);
        if (transfer(advisersPartners, advisersPartnersObligation)) {
            advisersPartnersObligation = 0;
        }
        
        if (transfer(teamWallet1, teamObligationPart1)) {
            teamObligationPart1 = 0;
        }
    }
    
    uint teamObligationPart2 = 23250000 ether;
    uint reserveFundObligation = 18600000 ether;
    
    function ReleaseTokenForTeamAdvisersPartners () public onlyOwner {
        // 12 march 2019
        require(now >= 1552348800);
        
        if (transfer(reserveFund, reserveFundObligation)) {
            reserveFundObligation = 0;
        }
        
        if (transfer(teamWallet2, teamObligationPart2)) {
            teamObligationPart2 = 0;
        }
    }
    
    function sendTokens(address _to, uint _value) public onlyOwner {
        require(_to != address(0));
        require(_value <= balances[tokenOwner]);
        balances[tokenOwner] = balances[tokenOwner].sub(_value);
        balances[_to] = balances[_to].add(_value);
        Transfer(tokenOwner, _to, _value);
    }
}

contract SalesManager is Ownable {

    using SafeMath for uint;

    uint public stage = 0;
    uint256 public weisRaised;  // how many weis was raised on crowdsale
    address public tokenAddress;
    uint256 public decimals = 18;
    uint256 DEC = 10 ** uint256(decimals);
    uint256 public buyPrice = 1000000000000000000 wei;
    address public ethOwner = 0x5FB3BBF3671C78C0c8008df5F5A0CF1130469e0b;


    function SalesManager() public {
        tokenAddress = new Streamity();
    }

    event CrowdSaleFinished(string info);

    struct Ico {
        uint256 tokens;             // Tokens in crowdsale
        uint startDate;             // Date when crowsale will be starting, after its starting that property will be the 0
        uint endDate;               // Date when crowdsale will be stop
        uint8 discount;             // Discount
        uint8 discountFirstDayICO;  // Discount. Only for first stage ico
    }

    Ico public ICO;


    function updateStat(uint256 tokens, uint startDate, uint endDate, uint8 discount, uint8 discountFirstDayICO) public onlyOwner {
        ICO = Ico(tokens, startDate, endDate, discount, discountFirstDayICO);
    }

    /*
    * Function confirm autosell
    *
    */
    function confirmSell(uint256 _amount) internal view
        returns(bool)
    {
        if (ICO.tokens < _amount) {
            return false;
        }

        return true;
    }

    /*
    *  Make discount
    */
    function countDiscount(uint256 amount) internal
        returns(uint256)
    {
        uint256 _amount = (amount.mul(DEC)).div(buyPrice);

        if (1 == stage) {
            _amount = _amount.add(withDiscount(_amount, ICO.discount));
        }
        else if (2 == stage)
        {
            if (now <= ICO.startDate + 1 days)
            {
                if (0 == ICO.discountFirstDayICO) {
                    ICO.discountFirstDayICO = 20;
                }
                _amount = _amount.add(withDiscount(_amount, ICO.discountFirstDayICO));
            }
            else
            {
                _amount = _amount.add(withDiscount(_amount, ICO.discount));
            }
        }
        else if (3 == stage) {
            _amount = _amount.add(withDiscount(_amount, ICO.discount));
        }

        return _amount;
    }

    /**
    * Function for change discount if need
    *
    */
    function changeDiscount(uint8 _discount) public onlyOwner
        returns (bool)
    {
        ICO = Ico (ICO.tokens, ICO.startDate, ICO.endDate, _discount, ICO.discountFirstDayICO);
        return true;
    }

    /**
    * Expanding of the functionality
    *
    * @param _numerator - Numerator - value (10000)
    * @param _denominator - Denominator - value (10000)
    *
    * example: price 1000 tokens by 1 ether = changeRate(1, 1000)
    */
    function changeRate(uint256 _numerator, uint256 _denominator) public onlyOwner
        returns (bool success)
    {
        if (_numerator == 0) _numerator = 1;
        if (_denominator == 0) _denominator = 1;

        buyPrice = (_numerator.mul(DEC)).div(_denominator);

        return true;
    }

    /*
    * Function show in contract what is now
    *
    */
    function crowdSaleStatus() internal constant
        returns (string)
    {
        if (1 == stage) {
            return "Pre-ICO";
        } else if(2 == stage) {
            return "ICO first stage";
        } else if (3 == stage) {
            return "ICO second stage";
        } else if (4 >= stage) {
            return "feature stage";
        }

        return "there is no stage at present";
    }

    /*
    * Seles manager
    *
    */
    function paymentManager(address sender, uint256 value) internal
    {
        uint256 discountValue = countDiscount(value);
        bool conf = confirmSell(discountValue);

        if (conf) {

            sell(sender, discountValue);

            weisRaised = weisRaised.add(value);

            if (now >= ICO.endDate) {
                Streamity(tokenAddress).pause();
                CrowdSaleFinished(crowdSaleStatus()); // if time is up
            }

        } else {

            sell(sender, ICO.tokens); // sell tokens which has been accessible

            weisRaised = weisRaised.add(value);

            Streamity(tokenAddress).pause();
            CrowdSaleFinished(crowdSaleStatus());  // if tokens sold
        }
    }

    /*
    * Function for selling tokens in crowd time.
    *
    */
    function sell(address _investor, uint256 _amount) internal
    {
        ICO.tokens = ICO.tokens.sub(_amount);

        Streamity(tokenAddress).sendTokens(_investor, _amount);
        if(!ethOwner.send(msg.value)) revert();
    }

    /*
    * Function for start crowdsale (any)
    *
    * @param _tokens - How much tokens will have the crowdsale - amount humanlike value (10000)
    * @param _startDate - When crowdsale will be start - unix timestamp (1512231703 )
    * @param _endDate - When crowdsale will be end - humanlike value (7) same as 7 days
    * @param _discount - Discount for the crowd - humanlive value (7) same as 7 %
    * @param _discount - Discount for the crowds first day - humanlive value (7) same as 7 %
    */
    function startCrowd(uint256 _tokens, uint _startDate, uint _endDate, uint8 _discount, uint8 _discountFirstDayICO) public onlyOwner
    {
        ICO = Ico (_tokens * DEC, _startDate, _startDate + _endDate * 1 days , _discount, _discountFirstDayICO);
        stage = stage.add(1);
        Streamity(tokenAddress).unpause();
    }

    /**
    * Function for web3js, should be call when somebody will buy tokens from website. This function only delegator.
    *
    * @param _investor - address of investor (who payed)
    * @param _amount - ethereum
    */
    function transferWeb3js(address _investor, uint256 _amount) external onlyOwner
    {
        sell(_investor, _amount);
    }

    /**
    * Function for adding discount
    *
    */
    function withDiscount(uint256 _amount, uint _percent) internal pure
        returns (uint256)
    {
        return (_amount.mul(_percent)).div(100);
    }

    /**
    * Function payments handler
    *
    */
    function() public payable
    {
        assert(msg.value >= 1 ether / 10);
        require(now >= ICO.startDate);

        if (Streamity(tokenAddress).paused() == false) {
            paymentManager(msg.sender, msg.value);
        } else {
            revert();
        }
    }

    // call any function from another contract
    function callData(address contractAddress, bytes data) public onlyOwner {
        if(!contractAddress.call(data)) revert();
    }

    function transferOwnershipToken(address newTokenOwnerAddress) public onlyOwner {
        Streamity tokenContract = Streamity(tokenAddress);
        tokenContract.transferOwnership(newTokenOwnerAddress);
    }

    function pauseToken() public onlyOwner {
        Streamity tokenContract = Streamity(tokenAddress);
        tokenContract.pause();
    }

    function unPauseToken() public onlyOwner {
        Streamity tokenContract = Streamity(tokenAddress);
        tokenContract.unpause();
    }

    function drop(address[] _destinations, uint256[] _amount) public onlyOwner
    returns (uint) {
        uint i = 0;
        while (i < _destinations.length) {
           Streamity(tokenAddress).sendTokens(_destinations[i], _amount[i]);
           i += 1;
        }
        return(i);
    }
}