And so .... Our smart contract code
pragma solidity ^0.4.11;
import "github.com/oraclize/ethereum-api/oraclizeAPI.sol";
contract ERC20Basic {
uint256 public totalSupply;
function balanceOf(address who) public constant returns (uint256);
function transfer(address to, uint256 value) public returns (bool);
event Transfer(address indexed from, address indexed to, uint256 value);
}
contract ERC20 is ERC20Basic {
function allowance(address owner, address spender) public constant 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);
}
library SafeMath {
function mul(uint256 a, uint256 b) internal constant returns (uint256) {
uint256 c = a * b;
assert(a == 0 || c / a == b);
return c;
}
function div(uint256 a, uint256 b) internal constant 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 c;
}
function sub(uint256 a, uint256 b) internal constant returns (uint256) {
assert(b <= a);
return a - b;
}
function add(uint256 a, uint256 b) internal constant returns (uint256) {
uint256 c = a + b;
assert(c >= a);
return c;
}
}
contract BasicToken is ERC20Basic {
using SafeMath for uint256;
mapping(address => uint256) balances;
function transfer(address _to, uint256 _value) public returns (bool) {
require(_to != address(0));
require(_value <= balances[msg.sender]);
// SafeMath.sub will throw if there is not enough balance.
balances[msg.sender] = balances[msg.sender].sub(_value);
balances[_to] = balances[_to].add(_value);
Transfer(msg.sender, _to, _value);
return true;
}
function balanceOf(address _owner) public constant returns (uint256 balance) {
return balances[_owner];
}
}
contract StandardToken is ERC20, BasicToken {
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(_to != address(0));
require(_value <= balances[_from]);
require(_value <= allowed[_from][msg.sender]);
balances[_from] = balances[_from].sub(_value);
balances[_to] = balances[_to].add(_value);
allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
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;
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 constant returns (uint256 remaining) {
return allowed[_owner][_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
*/
function increaseApproval (address _spender, uint _addedValue) public returns (bool success) {
allowed[msg.sender][_spender] = allowed[msg.sender][_spender].add(_addedValue);
Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
return true;
}
function decreaseApproval (address _spender, uint _subtractedValue) public returns (bool success) {
uint oldValue = allowed[msg.sender][_spender];
if (_subtractedValue > oldValue) {
allowed[msg.sender][_spender] = 0;
} else {
allowed[msg.sender][_spender] = oldValue.sub(_subtractedValue);
}
Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
return true;
}
}
contract Ownable {
address public owner;
address preIco;
address ico;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
/**
* @dev The Ownable constructor sets the original `owner` of the contract to the sender
* account.
*/
function Ownable() {
owner = msg.sender;
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
require(msg.sender == owner || msg.sender == preIco || msg.sender == ico);
_;
}
/**
* @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) onlyOwner public {
require(newOwner != address(0));
OwnershipTransferred(owner, newOwner);
owner = newOwner;
}
function setPreIco(address _preIco) onlyOwner public {
require(_preIco != address(0));
preIco = _preIco;
}
function setICO(address _ico) onlyOwner public {
require(_ico != address(0));
ico = _ico;
}
}
// TODO: это монета
contract MintableToken is StandardToken, Ownable {
uint256 limit;
uint256 limitPreico;
string public constant name = "Satoshi Brewery Limited";
string public constant symbol = "SBL";
uint8 public constant decimals = 1;
event Mint(address indexed to, uint256 amount);
event MintFinished();
bool public mintingFinished = false;
modifier canMint() {
require(!mintingFinished);
_;
}
function MintableToken() {
limit = 10000000;
limitPreico = 300000;
}
function mintPreico(address _to, uint256 _amount) onlyOwner canMint public returns (bool) {
require(totalSupply.add(_amount) <= limitPreico);
totalSupply = totalSupply.add(_amount);
balances[_to] = balances[_to].add(_amount);
Mint(_to, _amount);
Transfer(0x0, _to, _amount);
return true;
}
/**
* @dev Function to mint tokens
* @param _to The address that will receive the minted tokens.
* @param _amount The amount of tokens to mint.
* @return A boolean that indicates if the operation was successful.
*/
function mint(address _to, uint256 _amount) onlyOwner canMint public returns (bool) {
require(totalSupply.add(_amount) <= limit);
totalSupply = totalSupply.add(_amount);
balances[_to] = balances[_to].add(_amount);
Mint(_to, _amount);
Transfer(0x0, _to, _amount);
return true;
}
/**
* @dev Function to stop minting new tokens.
* @return True if the operation was successful.
*/
function finishMinting() onlyOwner public returns (bool) {
mintingFinished = true;
MintFinished();
return true;
}
}
// TODO: ЭТО PREICO
contract PreIco is Ownable, usingOraclize {
using SafeMath for uint256;
uint256 public dollarCost;
MintableToken public token;
uint256 public startTime;
uint256 public endTime;
uint256 public dollarMultiplier = 1000000 * 1000 szabo;
uint256 decimals = 1;
// how many token units a buyer gets per wei
uint256 public rate;
uint256 public minimumCost = 12 finney;
// amount of raised money in wei
uint256 public weiRaised;
event TokenPurchase(address indexed purchaser, address indexed beneficiary, uint256 value, uint256 amount);
event updatedEtherPrice(string price);
event updatingViaOracle(string description);
function PreIco(MintableToken _token) {
token = _token;
// TODO: PRODUCTION
// startTime = 1508500800;
// endTime = 1511222399;
// TODO: TEST
startTime = now;
endTime = now + 1 hours;
}
function setDollar(uint256 _dollarCost) onlyOwner {
require(_dollarCost > 0);
dollarCost = _dollarCost;
}
function __callback(bytes32 myid, string result) {
if (msg.sender != oraclize_cbAddress()) throw;
updatedEtherPrice(result);
dollarCost = dollarMultiplier.div(parseInt(result, 3));
}
function updatePrice() payable {
if (oraclize_getPrice("URL") > this.balance) {
updatingViaOracle("Oraclize query was NOT sent, please add some ETH to cover for the query fee");
} else {
updatingViaOracle("Oraclize query was sent, standing by for the answer..");
oraclize_query("URL", "json(https://api.kraken.com/0/public/Ticker?pair=ETHUSD).result.XETHZUSD.c.[0]");
}
}
function getRate() internal constant returns (uint256) {
return dollarCost.mul(67).div(100);
}
// fallback function can be used to buy tokens
function () payable {
require(!hasEnded());
require(msg.value >= minimumCost);
require(validPurchase(msg.value));
uint256 weiAmount = msg.value;
rate = getRate();
// calculate token amount to be created
uint256 tokens = weiAmount.div(rate);
// update state
weiRaised = weiRaised.add(weiAmount);
token.mintPreico(msg.sender, tokens.mul(10 ** decimals));
TokenPurchase(msg.sender, msg.sender, weiAmount, tokens);
forwardFunds(msg.value);
}
// send ether to the fund collection wallet
// override to create custom fund forwarding mechanisms
function forwardFunds(uint256 value) internal {
owner.transfer(value);
}
function hasEnded() public constant returns (bool) {
return now > endTime;
}
function validPurchase(uint256 value) internal constant returns (bool) {
bool nonZeroPurchase = value != 0;
return nonZeroPurchase;
}
}
// TODO: ЭТО ICO
contract ICO is Ownable, usingOraclize {
using SafeMath for uint256;
address[] investorsArray;
uint256 public dollarCost;
PreIco public preICO;
MintableToken public token;
struct Investor {
uint256 amount;
bool isBack;
}
mapping (address => Investor) public investors;
uint256 public startTime;
uint256 public endTime;
// TODO: time variables
uint256 public secondTime;
uint256 public thirdTime;
uint256 public fourthTime;
uint256 public fifthTime;
uint256 public sixthTime;
uint256 public seventhTime;
uint256 public eighthTime;
uint256 public ninthTime;
uint256 public tenthTime;
uint256 public eleventhTime;
uint256 decimals = 1;
uint256 public dollarMultiplier = 1000000 * 1000 szabo;
// how many token units a buyer gets per wei
uint256 public rate;
uint256 public goal;
uint256 public minimumCost = 100 finney;
// amount of raised money in wei
uint256 public weiRaised;
event TokenPurchase(address indexed purchaser, address indexed beneficiary, uint256 value, uint256 amount);
event updatedEtherPrice(string price);
event updatingViaOracle(string description);
function ICO(MintableToken _token, PreIco _preIco) {
require(_preIco != address(0));
require(_token != address(0));
token = _token;
preICO = _preIco;
goal = 7200000;
// TODO: PRODUCTION
// startTime = 1508500800;
// secondTime = 1511222399;
// thirdTime = 1511740800;
// fourthTime = 1512086399;
// fifthTime = 1512086400;
// sixthTime = 1512518399;
// seventhTime = 1512518400;
// eighthTime = 1512950399;
// ninthTime = 1512950400;
// tenthTime = 1513382399;
// eleventhTime = 1513382400;
// endTime = 1514419199;
// TODO: TEST
startTime = now;
secondTime = startTime + 1 hours;
thirdTime = secondTime + 1 minutes;
fourthTime = thirdTime + 1 hours;
fifthTime = fourthTime + 1 minutes;
sixthTime = fifthTime + 1 hours;
seventhTime = sixthTime + 1 minutes;
eighthTime = seventhTime + 1 hours;
ninthTime = eighthTime + 1 minutes;
tenthTime = ninthTime + 1 hours;
eleventhTime = tenthTime + 1 minutes;
endTime = eleventhTime + 1 hours;
}
function setDollar(uint256 _dollarCost) onlyOwner {
require(_dollarCost > 0);
dollarCost = _dollarCost;
}
function __callback(bytes32 myid, string result) {
if (msg.sender != oraclize_cbAddress()) throw;
updatedEtherPrice(result);
dollarCost = dollarMultiplier.div(parseInt(result, 3));
}
function updatePrice() payable {
if (oraclize_getPrice("URL") > this.balance) {
updatingViaOracle("Oraclize query was NOT sent, please add some ETH to cover for the query fee");
} else {
updatingViaOracle("Oraclize query was sent, standing by for the answer..");
oraclize_query("URL", "json(https://api.kraken.com/0/public/Ticker?pair=ETHUSD).result.XETHZUSD.c.[0]");
}
}
function getRate() internal constant returns (uint256) {
if (startTime < now && now <= secondTime) {
return dollarCost.mul(67).div(100);
}
if (thirdTime < now && now <= fourthTime) {
return dollarCost.mul(98).div(100);
}
if (fifthTime < now && now <= sixthTime) {
return dollarCost.mul(102).div(100);
}
if (seventhTime < now && now <= eighthTime) {
return dollarCost.mul(105).div(100);
}
if (ninthTime < now && now <= tenthTime) {
return dollarCost.mul(109).div(100);
}
if (eleventhTime < now && now <= endTime) {
return dollarCost.mul(120).div(100);
}
}
function getMoneyBack() public onlyOwner {
require(!goalReached());
require(!hasFunded());
for (uint256 i = 0; i < investorsArray.length; i++) {
if (!investors[investorsArray[i]].isBack && investors[investorsArray[i]].amount > 0) {
investorsArray[i].transfer(investors[investorsArray[i]].amount);
investors[investorsArray[i]].amount = 0;
investors[investorsArray[i]].isBack = true;
}
}
}
function oneGetMoneyBack() {
require(!goalReached());
require(!hasFunded());
require(investors[msg.sender].amount > 0);
require(!investors[msg.sender].isBack);
msg.sender.transfer(investors[msg.sender].amount);
investors[msg.sender].amount = 0;
investors[msg.sender].isBack = true;
}
function () payable {
require(!hasEnded());
require(!hasFunded());
require(now > thirdTime);
require(msg.value >= minimumCost);
require(validPurchase(msg.value));
uint256 weiAmount = msg.value;
rate = getRate();
// calculate token amount to be created
uint256 tokens = weiAmount.div(rate);
// update state
weiRaised = weiRaised.add(weiAmount);
token.mint(msg.sender, tokens.mul(10 ** decimals));
investors[msg.sender].amount += msg.value;
investorsArray.push(msg.sender);
TokenPurchase(msg.sender, msg.sender, weiAmount, tokens);
}
// send ether to the fund collection wallet
// override to create custom fund forwarding mechanisms
function forwardFunds(uint256 amount) onlyOwner {
require(amount > 0);
require(hasEnded());
require(hasFunded());
require(this.balance - amount >= 0);
owner.transfer(amount);
}
function hasEnded() public constant returns (bool) {
return now > endTime;
}
function hasFunded() public constant returns (bool) {
return weiRaised >= dollarCost.mul(goal).sub(preICO.weiRaised());
}
function validPurchase(uint256 value) internal constant returns (bool) {
bool nonZeroPurchase = value != 0;
return nonZeroPurchase;
}
function goalReached() public constant returns (bool) {
return weiRaised >= dollarCost.mul(goal).mul(75).div(100);
}
}
