pragma solidity ^0.4.15;
/**
* @title SafeMath
* @dev Math operations with safety checks that throw on error
*/
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;
}
}
/**
* @title ERC20Basic
* @dev Simpler version of ERC20 interface
* @dev see https://github.com/ethereum/EIPs/issues/179
*/
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);
}
/**
* @title ERC20 interface
* @dev see https://github.com/ethereum/EIPs/issues/20
*/
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);
}
/**
* @title Basic token
* @dev Basic version of StandardToken, with no allowances.
*/
contract BasicToken is ERC20Basic {
using SafeMath for uint256;
mapping(address => uint256) balances;
/**
* @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(_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;
}
/**
* @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 constant returns (uint256 balance) {
return balances[_owner];
}
}
/**
* @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 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);
_;
}
/**
* @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;
}
}
/**
* @title Standard ERC20 token
*
* @dev Implementation of the basic standard token.
* @dev https://github.com/ethereum/EIPs/issues/20
* @dev Based on code by FirstBlood: https://github.com/Firstbloodio/token/blob/master/smart_contract/FirstBloodToken.sol
*/
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) {
// To change the approve amount you first have to reduce the addresses`
// allowance to zero by calling `approve(_spender, 0)` if it is not
// already 0 to mitigate the race condition described here:
// https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
require((_value == 0) || (allowed[msg.sender][_spender] == 0));
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;
}
}
/**
* @title Mintable token
* @dev Simple ERC20 Token example, with mintable token creation
* @dev Issue: * https://github.com/OpenZeppelin/zeppelin-solidity/issues/120
* Based on code by TokenMarketNet: https://github.com/TokenMarketNet/ico/blob/master/contracts/MintableToken.sol
*/
contract MintableToken is StandardToken, Ownable {
event Mint(address indexed to, uint256 amount);
event MintFinished();
bool public mintingFinished = false;
modifier canMint() {
require(!mintingFinished);
_;
}
/**
* @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) {
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;
}
}
/**
* @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;
Pause();
}
/**
* @dev called by the owner to unpause, returns to normal state
*/
function unpause() onlyOwner whenPaused public {
paused = false;
Unpause();
}
}
contract PausableToken is StandardToken, 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 WELToken is MintableToken, PausableToken {
string public constant name = "Welcome Coin";
string public constant symbol = "WEL";
uint8 public constant decimals = 18;
}
/**
* @title RefundVault
* @dev This contract is used for storing funds while a crowdsale
* is in progress. Supports refunding the money if crowdsale fails,
* and forwarding it if crowdsale is successful.
*/
contract RefundVault is Ownable {
using SafeMath for uint256;
enum State { Active, Refunding, Closed }
mapping (address => uint256) public deposited;
address public wallet;
State public state;
event Closed();
event RefundsEnabled();
event Refunded(address indexed beneficiary, uint256 weiAmount);
function RefundVault(address _wallet) {
require(_wallet != 0x0);
wallet = _wallet;
state = State.Active;
}
function deposit(address investor) onlyOwner public payable {
require(state == State.Active);
deposited[investor] = deposited[investor].add(msg.value);
}
function close() onlyOwner public {
require(state == State.Active);
state = State.Closed;
Closed();
wallet.transfer(this.balance);
}
function enableRefunds() onlyOwner public {
require(state == State.Active);
state = State.Refunding;
RefundsEnabled();
}
function refund(address investor) public {
require(state == State.Refunding);
uint256 depositedValue = deposited[investor];
deposited[investor] = 0;
investor.transfer(depositedValue);
Refunded(investor, depositedValue);
}
}
/**
* @title Crowdsale
* @dev Modified contract for managing a token crowdsale.
* WelCoinCrowdsale have pre-sale and main sale periods, where investors can make
* token purchases and the crowdsale will assign them tokens based
* on a token per ETH rate and the system of bonuses.
* Funds collected are forwarded to a wallet as they arrive.
* pre-sale and main sale periods both have caps defined in tokens
*/
contract WelCoinCrowdsale is Ownable {
using SafeMath for uint256;
struct Bonus {
uint bonusEndTime;
uint timePercent;
uint bonusMinAmount;
uint amountPercent;
}
// minimum amount of funds to be raised in weis
uint256 public goal;
// wel token emission
uint256 public tokenEmission;
// refund vault used to hold funds while crowdsale is running
RefundVault public vault;
// true for finalised crowdsale
bool public isFinalized;
// The token being sold
MintableToken public token;
// start and end timestamps where pre-investments are allowed (both inclusive)
uint256 public preSaleStartTime;
uint256 public preSaleEndTime;
// start and end timestamps where main-investments are allowed (both inclusive)
uint256 public mainSaleStartTime;
uint256 public mainSaleEndTime;
// maximum amout of wei for pre-sale and main sale
uint256 public preSaleWeiCap;
uint256 public mainSaleWeiCap;
// address where funds are collected
address public wallet;
// address where final 10% of funds will be collected
address public tokenWallet;
// how many token units a buyer gets per wei
uint256 public rate;
// amount of raised money in wei
uint256 public weiRaised;
Bonus[] public preSaleBonuses;
Bonus[] public mainSaleBonuses;
uint256 public preSaleMinimumWei;
uint256 public mainSaleMinimumWei;
uint256 public defaultPercent;
/**
* event for token purchase logging
* @param purchaser who paid for the tokens
* @param beneficiary who got the tokens
* @param value weis paid for purchase
* @param amount amount of tokens purchased
*/
event TokenPurchase(address indexed purchaser, address indexed beneficiary, uint256 value, uint256 amount);
event FinalisedCrowdsale(uint256 totalSupply, uint256 minterBenefit);
function WelCoinCrowdsale(uint256 _preSaleStartTime, uint256 _preSaleEndTime, uint256 _preSaleWeiCap, uint256 _mainSaleStartTime, uint256 _mainSaleEndTime, uint256 _mainSaleWeiCap, uint256 _goal, uint256 _rate, address _wallet, address _tokenWallet) public {
//require(_goal > 0);
// can't start pre-sale in the past
require(_preSaleStartTime >= now);
// can't start main sale in the past
require(_mainSaleStartTime >= now);
// can't start main sale before the end of pre-sale
require(_preSaleEndTime < _mainSaleStartTime);
// the end of pre-sale can't happen before it's start
require(_preSaleStartTime < _preSaleEndTime);
// the end of main sale can't happen before it's start
require(_mainSaleStartTime < _mainSaleEndTime);
require(_rate > 0);
require(_preSaleWeiCap > 0);
require(_mainSaleWeiCap > 0);
require(_wallet != 0x0);
require(_tokenWallet != 0x0);
preSaleMinimumWei = 300000000000000000; // 0.3 Ether default minimum
mainSaleMinimumWei = 300000000000000000; // 0.3 Ether default minimum
defaultPercent = 0;
tokenEmission = 150000000 ether;
preSaleBonuses.push(Bonus({bonusEndTime: 3600 * 24 * 2, timePercent: 20, bonusMinAmount: 8500 ether, amountPercent: 25}));
preSaleBonuses.push(Bonus({bonusEndTime: 3600 * 24 * 4, timePercent: 20, bonusMinAmount: 0, amountPercent: 0}));
preSaleBonuses.push(Bonus({bonusEndTime: 3600 * 24 * 6, timePercent: 15, bonusMinAmount: 0, amountPercent: 0}));
preSaleBonuses.push(Bonus({bonusEndTime: 3600 * 24 * 7, timePercent: 10, bonusMinAmount: 20000 ether, amountPercent: 15}));
mainSaleBonuses.push(Bonus({bonusEndTime: 3600 * 24 * 7, timePercent: 9, bonusMinAmount: 0, amountPercent: 0}));
mainSaleBonuses.push(Bonus({bonusEndTime: 3600 * 24 * 14, timePercent: 6, bonusMinAmount: 0, amountPercent: 0}));
mainSaleBonuses.push(Bonus({bonusEndTime: 3600 * 24 * 21, timePercent: 4, bonusMinAmount: 0, amountPercent: 0}));
mainSaleBonuses.push(Bonus({bonusEndTime: 3600 * 24 * 28, timePercent: 0, bonusMinAmount: 0, amountPercent: 0}));
preSaleStartTime = _preSaleStartTime;
preSaleEndTime = _preSaleEndTime;
preSaleWeiCap = _preSaleWeiCap;
mainSaleStartTime = _mainSaleStartTime;
mainSaleEndTime = _mainSaleEndTime;
mainSaleWeiCap = _mainSaleWeiCap;
goal = _goal;
rate = _rate;
wallet = _wallet;
tokenWallet = _tokenWallet;
isFinalized = false;
token = new WELToken();
vault = new RefundVault(wallet);
}
// fallback function can be used to buy tokens
function () payable {
buyTokens(msg.sender);
}
// low level token purchase function
function buyTokens(address beneficiary) public payable {
require(beneficiary != 0x0);
require(msg.value != 0);
require(!isFinalized);
uint256 weiAmount = msg.value;
validateWithinPeriods();
validateWithinCaps(weiAmount);
// calculate token amount to be created
uint256 tokens = weiAmount.mul(rate);
uint256 percent = getBonusPercent(tokens, now);
// add bonus to tokens depends on the period
uint256 bonusedTokens = applyBonus(tokens, percent);
// update state
weiRaised = weiRaised.add(weiAmount);
token.mint(beneficiary, bonusedTokens);
TokenPurchase(msg.sender, beneficiary, weiAmount, bonusedTokens);
forwardFunds();
}
// owner can mint tokens during crowdsale withing defined caps
function mintTokens(address beneficiary, uint256 weiAmount, uint256 forcePercent) external onlyOwner returns (bool) {
require(forcePercent <= 100);
require(beneficiary != 0x0);
require(weiAmount != 0);
require(!isFinalized);
validateWithinCaps(weiAmount);
uint256 percent = 0;
// calculate token amount to be created
uint256 tokens = weiAmount.mul(rate);
if (forcePercent == 0) {
percent = getBonusPercent(tokens, now);
} else {
percent = forcePercent;
}
// add bonus to tokens depends on the period
uint256 bonusedTokens = applyBonus(tokens, percent);
// update state
weiRaised = weiRaised.add(weiAmount);
token.mint(beneficiary, bonusedTokens);
TokenPurchase(msg.sender, beneficiary, weiAmount, bonusedTokens);
}
// set new dates for pre-salev (emergency case)
function setPreSaleParameters(uint256 _preSaleStartTime, uint256 _preSaleEndTime, uint256 _preSaleWeiCap, uint256 _preSaleMinimumWei) public onlyOwner {
require(!isFinalized);
require(_preSaleStartTime < _preSaleEndTime);
require(_preSaleWeiCap > 0);
preSaleStartTime = _preSaleStartTime;
preSaleEndTime = _preSaleEndTime;
preSaleWeiCap = _preSaleWeiCap;
preSaleMinimumWei = _preSaleMinimumWei;
}
// set new dates for main-sale (emergency case)
function setMainSaleParameters(uint256 _mainSaleStartTime, uint256 _mainSaleEndTime, uint256 _mainSaleWeiCap, uint256 _mainSaleMinimumWei) public onlyOwner {
require(!isFinalized);
require(_mainSaleStartTime < _mainSaleEndTime);
require(_mainSaleWeiCap > 0);
mainSaleStartTime = _mainSaleStartTime;
mainSaleEndTime = _mainSaleEndTime;
mainSaleWeiCap = _mainSaleWeiCap;
mainSaleMinimumWei = _mainSaleMinimumWei;
}
// set new wallets (emergency case)
function setWallets(address _wallet, address _tokenWallet) public onlyOwner {
require(!isFinalized);
require(_wallet != 0x0);
require(_tokenWallet != 0x0);
wallet = _wallet;
tokenWallet = _tokenWallet;
}
// set new rate (emergency case)
function setRate(uint256 _rate) public onlyOwner {
require(!isFinalized);
require(_rate > 0);
rate = _rate;
}
// set new goal (emergency case)
function setGoal(uint256 _goal) public onlyOwner {
require(!isFinalized);
require(_goal > 0);
goal = _goal;
}
// set token on pause
function pauseToken() external onlyOwner {
require(!isFinalized);
WELToken(token).pause();
}
// unset token's pause
function unpauseToken() external onlyOwner {
WELToken(token).unpause();
}
// set token Ownership
function transferTokenOwnership(address newOwner) external onlyOwner {
WELToken(token).transferOwnership(newOwner);
}
// @return true if main sale event has ended
function mainSaleHasEnded() external constant returns (bool) {
return now > mainSaleEndTime;
}
// @return true if pre sale event has ended
function preSaleHasEnded() external constant returns (bool) {
return now > preSaleEndTime;
}
// send ether to the fund collection wallet
function forwardFunds() internal {
//wallet.transfer(msg.value);
vault.deposit.value(msg.value)(msg.sender);
}
// we want to be able to check all bonuses in already deployed contract
// that's why we pass currentTime as a parameter instead of using "now"
function getBonusPercent(uint256 tokens, uint256 currentTime) public constant returns (uint256 percent) {
//require(currentTime >= preSaleStartTime);
uint i = 0;
bool isPreSale = currentTime >= preSaleStartTime && currentTime <= preSaleEndTime;
if (isPreSale) {
uint256 preSaleDiffInSeconds = currentTime.sub(preSaleStartTime);
for (i = 0; i < preSaleBonuses.length; i++) {
if (preSaleDiffInSeconds <= preSaleBonuses[i].bonusEndTime) {
if (preSaleBonuses[i].bonusMinAmount > 0 && tokens >= preSaleBonuses[i].bonusMinAmount) {
return preSaleBonuses[i].amountPercent;
} else {
return preSaleBonuses[i].timePercent;
}
}
}
} else {
uint256 mainSaleDiffInSeconds = currentTime.sub(mainSaleStartTime);
for (i = 0; i < mainSaleBonuses.length; i++) {
if (mainSaleDiffInSeconds <= mainSaleBonuses[i].bonusEndTime) {
if (mainSaleBonuses[i].bonusMinAmount > 0 && tokens >= mainSaleBonuses[i].bonusMinAmount) {
return mainSaleBonuses[i].amountPercent;
} else {
return mainSaleBonuses[i].timePercent;
}
}
}
}
return defaultPercent;
}
function applyBonus(uint256 tokens, uint256 percent) internal constant returns (uint256 bonusedTokens) {
uint256 tokensToAdd = tokens.mul(percent).div(100);
return tokens.add(tokensToAdd);
}
function validateWithinPeriods() internal constant {
// within pre-sale or main sale
require((now >= preSaleStartTime && now <= preSaleEndTime) || (now >= mainSaleStartTime && now <= mainSaleEndTime));
}
function validateWithinCaps(uint256 weiAmount) internal constant {
uint256 expectedWeiRaised = weiRaised.add(weiAmount);
// within pre-sale
if (now >= preSaleStartTime && now <= preSaleEndTime) {
require(weiAmount >= preSaleMinimumWei);
require(expectedWeiRaised <= preSaleWeiCap);
}
// within main sale
if (now >= mainSaleStartTime && now <= mainSaleEndTime) {
require(weiAmount >= mainSaleMinimumWei);
require(expectedWeiRaised <= mainSaleWeiCap);
}
}
// if crowdsale is unsuccessful, investors can claim refunds here
function claimRefund() public {
require(isFinalized);
require(!goalReached());
vault.refund(msg.sender);
}
function goalReached() public constant returns (bool) {
return weiRaised >= goal;
}
// finish crowdsale,
// take totalSupply as 90% and mint 10% more to specified owner's wallet
// then stop minting forever
function finaliseCrowdsale() external onlyOwner returns (bool) {
require(!isFinalized);
uint256 totalSupply = token.totalSupply();
uint256 minterBenefit = tokenEmission.sub(totalSupply);
if (goalReached()) {
token.mint(tokenWallet, minterBenefit);
vault.close();
//token.finishMinting();
} else {
vault.enableRefunds();
}
FinalisedCrowdsale(totalSupply, minterBenefit);
isFinalized = true;
return true;
}
}
{
"compilationTarget": {
"WelCoinCrowdsale.sol": "WelCoinCrowdsale"
},
"libraries": {},
"optimizer": {
"enabled": false,
"runs": 200
},
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}
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