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pragma solidity ^0.4.11;
library SafeMath {
function mul(uint a, uint b) internal returns (uint) {
uint c = a * b;
assert(a == 0 || c / a == b);
return c;
}
function div(uint a, uint b) internal returns (uint) {
assert(b > 0);
uint c = a / b;
assert(a == b * c + a % b);
return c;
}
function sub(uint a, uint b) internal returns (uint) {
assert(b <= a);
return a - b;
}
function add(uint a, uint b) internal returns (uint) {
uint c = a + b;
assert(c >= a);
return c;
}
function max64(uint64 a, uint64 b) internal constant returns (uint64) {
return a >= b ? a : b;
}
function min64(uint64 a, uint64 b) internal constant returns (uint64) {
return a < b ? a : b;
}
function max256(uint256 a, uint256 b) internal constant returns (uint256) {
return a >= b ? a : b;
}
function min256(uint256 a, uint256 b) internal constant returns (uint256) {
return a < b ? a : b;
}
function assert(bool assertion) internal {
if (!assertion) {
throw;
}
}
}
contract Ownable {
address public owner;
function Ownable() {
owner = msg.sender;
}
modifier onlyOwner {
if (msg.sender != owner) throw;
_;
}
function transferOwnership(address newOwner) onlyOwner {
if (newOwner != address(0)) {
owner = newOwner;
}
}
}
/*
* Pausable
* Abstract contract that allows children to implement an
* emergency stop mechanism.
*/
contract Pausable is Ownable {
bool public stopped;
modifier stopInEmergency {
if (stopped) {
throw;
}
_;
}
modifier onlyInEmergency {
if (!stopped) {
throw;
}
_;
}
// called by the owner on emergency, triggers stopped state
function emergencyStop() external onlyOwner {
stopped = true;
}
// called by the owner on end of emergency, returns to normal state
function release() external onlyOwner onlyInEmergency {
stopped = false;
}
}
contract ERC20Basic {
uint public totalSupply;
function balanceOf(address who) constant returns (uint);
function transfer(address to, uint value);
event Transfer(address indexed from, address indexed to, uint value);
}
contract ERC20 is ERC20Basic {
function allowance(address owner, address spender) constant returns (uint);
function transferFrom(address from, address to, uint value);
function approve(address spender, uint value);
event Approval(address indexed owner, address indexed spender, uint value);
}
/*
* PullPayment
* Base contract supporting async send for pull payments.
* Inherit from this contract and use asyncSend instead of send.
*/
contract PullPayment {
using SafeMath for uint;
mapping(address => uint) public payments;
event LogRefundETH(address to, uint value);
/**
* Store sent amount as credit to be pulled, called by payer
**/
function asyncSend(address dest, uint amount) internal {
payments[dest] = payments[dest].add(amount);
}
// withdraw accumulated balance, called by payee
function withdrawPayments() {
address payee = msg.sender;
uint payment = payments[payee];
if (payment == 0) {
throw;
}
if (this.balance < payment) {
throw;
}
payments[payee] = 0;
if (!payee.send(payment)) {
throw;
}
LogRefundETH(payee,payment);
}
}
contract BasicToken is ERC20Basic {
using SafeMath for uint;
mapping(address => uint) balances;
/*
* Fix for the ERC20 short address attack
*/
modifier onlyPayloadSize(uint size) {
if(msg.data.length < size + 4) {
throw;
}
_;
}
function transfer(address _to, uint _value) onlyPayloadSize(2 * 32) {
balances[msg.sender] = balances[msg.sender].sub(_value);
balances[_to] = balances[_to].add(_value);
Transfer(msg.sender, _to, _value);
}
function balanceOf(address _owner) constant returns (uint balance) {
return balances[_owner];
}
}
contract StandardToken is BasicToken, ERC20 {
mapping (address => mapping (address => uint)) allowed;
function transferFrom(address _from, address _to, uint _value) onlyPayloadSize(3 * 32) {
var _allowance = allowed[_from][msg.sender];
// Check is not needed because sub(_allowance, _value) will already throw if this condition is not met
// if (_value > _allowance) throw;
balances[_to] = balances[_to].add(_value);
balances[_from] = balances[_from].sub(_value);
allowed[_from][msg.sender] = _allowance.sub(_value);
Transfer(_from, _to, _value);
}
function approve(address _spender, uint _value) {
// 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
if ((_value != 0) && (allowed[msg.sender][_spender] != 0)) throw;
allowed[msg.sender][_spender] = _value;
Approval(msg.sender, _spender, _value);
}
function allowance(address _owner, address _spender) constant returns (uint remaining) {
return allowed[_owner][_spender];
}
}
/**
* DetectorToken token contract. Implements
*/
contract DetectorToken is StandardToken, Ownable {
string public constant name = "DetectorToken";
string public constant symbol = "DTCT";
uint public constant decimals = 6;
// Constructor
function DetectorToken() {
totalSupply = 12000000000000;
balances[msg.sender] = totalSupply; // Send all tokens to owner
}
/**
* Burn away the specified amount of DetectorToken tokens
*/
function burn(uint _value) onlyOwner returns (bool) {
balances[msg.sender] = balances[msg.sender].sub(_value);
totalSupply = totalSupply.sub(_value);
Transfer(msg.sender, 0x0, _value);
return true;
}
}
/*
Crowdsale Smart Contract for the DetectorToken.com project
This smart contract collects ETH, and in return emits DetectorToken tokens to the backers
*/
contract Crowdsale is Pausable, PullPayment {
using SafeMath for uint;
struct Backer {
uint weiReceived; // Amount of Ether given
uint coinSent;
}
/*
* Constants
*/
/* Minimum number of DetectorToken to sell */
uint public constant MIN_CAP = 1; // 1 DetectorToken min cap
/* Maximum number of DetectorToken to sell */
uint public constant MAX_CAP = 10000000000000; // 10,000,000 DetectorTokens
/* Minimum amount to invest */
uint public constant MIN_INVEST_ETHER = 10 finney;
/* Crowdsale period */
uint private constant CROWDSALE_PERIOD = 30 days;
/* Number of DetectorToken per Ether */
uint public constant COIN_PER_ETHER = 700000000; // 700 detector tokens for 1 ether
/*
* Variables
*/
/* DetectorToken contract reference */
DetectorToken public coin;
/* Multisig contract that will receive the Ether */
address public multisigEther;
/* Number of Ether received */
uint public etherReceived;
/* Number of DetectorToken sent to Ether contributors */
uint public coinSentToEther;
/* Crowdsale start time */
uint public startTime;
/* Crowdsale end time */
uint public endTime;
/* Is crowdsale still on going */
bool public crowdsaleClosed;
/* Backers Ether indexed by their Ethereum address */
mapping(address => Backer) public backers;
/*
* Modifiers
*/
modifier minCapNotReached() {
if ((now < endTime) || coinSentToEther >= MIN_CAP ) throw;
_;
}
modifier respectTimeFrame() {
if ((now < startTime) || (now > endTime )) throw;
_;
}
/*
* Event
*/
event LogReceivedETH(address addr, uint value);
event LogCoinsEmited(address indexed from, uint amount);
/*
* Constructor
*/
function Crowdsale(address _dtctTokenAddress, address _to) {
coin = DetectorToken(_dtctTokenAddress);
multisigEther = _to;
}
/*
* The fallback function corresponds to a donation in ETH
*/
function() stopInEmergency respectTimeFrame payable {
receiveETH(msg.sender);
}
/*
* To call to start the crowdsale
*/
function start() onlyOwner {
if (startTime != 0) throw; // Crowdsale was already started
startTime = now ;
endTime = now + CROWDSALE_PERIOD;
}
/*
* Receives a donation in Ether
*/
function receiveETH(address beneficiary) internal {
if (msg.value < MIN_INVEST_ETHER) throw; // Don't accept funding under a predefined threshold
uint coinToSend = bonus(msg.value.mul(COIN_PER_ETHER).div(1 ether));
if (coinToSend.add(coinSentToEther) > MAX_CAP) throw;
Backer backer = backers[beneficiary];
coin.transfer(beneficiary, coinToSend);
backer.coinSent = backer.coinSent.add(coinToSend);
backer.weiReceived = backer.weiReceived.add(msg.value); // Update the total wei collected during the crowdfunding for this backer
etherReceived = etherReceived.add(msg.value); // Update the total wei collected during the crowdfunding
coinSentToEther = coinSentToEther.add(coinToSend);
// Send events
LogCoinsEmited(msg.sender ,coinToSend);
LogReceivedETH(beneficiary, etherReceived);
}
/*
*Compute the DetectorToken bonus according to the investment period
*/
function bonus(uint amount) internal constant returns (uint) {
if (now < startTime.add(10 days)) return amount.add(amount.div(4)); // bonus 25% - August 20 - August 30
if (now < startTime.add(20 days)) return amount.add(amount.div(10)); // bonus 10% - August 31 - September 9
return amount;
}
/*
* Finalize the crowdsale, should be called after the refund period
*/
function finalize() onlyOwner public {
if (now < endTime) { // Cannot finalise before CROWDSALE_PERIOD
throw;
}
if (coinSentToEther < MIN_CAP && now < endTime + 15 days) throw; // If MIN_CAP is not reached donors have 15days to get refund before we can finalise
if (!multisigEther.send(this.balance)) throw; // Move the remaining Ether to the multisig address
uint remains = coin.balanceOf(this);
if (remains > 0) { // Burn the rest of DetectorTokens
if (!coin.burn(remains)) throw ;
}
crowdsaleClosed = true;
}
/*
* Failsafe drain
*/
function drain() onlyOwner {
if (!owner.send(this.balance)) throw;
}
/**
* Allow to change the team multisig address in the case of emergency.
*/
function setMultisig(address addr) onlyOwner public {
if (addr == address(0)) throw;
multisigEther = addr;
}
/**
* Manually back DetectorToken owner address.
*/
function backDetectorTokenOwner() onlyOwner public {
coin.transferOwnership(owner);
}
/**
* Transfer remains to owner in case if impossible to do min invest
*/
function getRemainCoins() onlyOwner public {
var remains = MAX_CAP - coinSentToEther;
uint minCoinsToSell = bonus(MIN_INVEST_ETHER.mul(COIN_PER_ETHER) / (1 ether));
if(remains > minCoinsToSell) throw;
Backer backer = backers[owner];
coin.transfer(owner, remains); // Transfer DetectorTokens right now
backer.coinSent = backer.coinSent.add(remains);
coinSentToEther = coinSentToEther.add(remains);
// Send events
LogCoinsEmited(this ,remains);
LogReceivedETH(owner, etherReceived);
}
/*
* When MIN_CAP is not reach:
* 1) backer call the "approve" function of the DetectorToken token contract with the amount of all DetectorToken they got in order to be refund
* 2) backer call the "refund" function of the Crowdsale contract with the same amount of DetectorToken
* 3) backer call the "withdrawPayments" function of the Crowdsale contract to get a refund in ETH
*/
function refund(uint _value) minCapNotReached public {
if (_value != backers[msg.sender].coinSent) throw; // compare value from backer balance
coin.transferFrom(msg.sender, address(this), _value); // get the token back to the crowdsale contract
if (!coin.burn(_value)) throw ; // token sent for refund are burnt
uint ETHToSend = backers[msg.sender].weiReceived;
backers[msg.sender].weiReceived=0;
if (ETHToSend > 0) {
asyncSend(msg.sender, ETHToSend); // pull payment to get refund in ETH
}
}
}