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pragma solidity ^0.4.11; | |
/** | |
* @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 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 | |
*/ | |
/** | |
* @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]; | |
} | |
} | |
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; | |
} | |
} | |
/** | |
* @title SafeERC20 | |
* @dev Wrappers around ERC20 operations that throw on failure. | |
* To use this library you can add a `using SafeERC20 for ERC20;` statement to your contract, | |
* which allows you to call the safe operations as `token.safeTransfer(...)`, etc. | |
*/ | |
library SafeERC20 { | |
function safeTransfer(ERC20Basic token, address to, uint256 value) internal { | |
assert(token.transfer(to, value)); | |
} | |
function safeTransferFrom(ERC20 token, address from, address to, uint256 value) internal { | |
assert(token.transferFrom(from, to, value)); | |
} | |
function safeApprove(ERC20 token, address spender, uint256 value) internal { | |
assert(token.approve(spender, value)); | |
} | |
} | |
/** | |
* @title Burnable Token | |
* @dev Token that can be irreversibly burned (destroyed). | |
*/ | |
/** | |
* @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; | |
} | |
} | |
contract BurnableToken is StandardToken { | |
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 { | |
require(_value > 0); | |
require(_value <= balances[msg.sender]); | |
// 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 | |
address burner = msg.sender; | |
balances[burner] = balances[burner].sub(_value); | |
totalSupply = totalSupply.sub(_value); | |
Burn(burner, _value); | |
} | |
} | |
/** | |
* @title AlttradexToken | |
* @dev Created limited supply burnable token and assigns all tokens to the contact creator. | |
*/ | |
contract AlttradexToken is BurnableToken { | |
string public constant name = "Alttradex Token"; | |
string public constant symbol = "ATXT"; | |
uint32 public constant decimals = 18; | |
uint256 public INITIAL_SUPPLY = 142857143 * 1000000000000000000; | |
function AlttradexToken() { | |
totalSupply = INITIAL_SUPPLY; | |
balances[msg.sender] = totalSupply; | |
} | |
} | |
/** | |
* @title Crowdsale | |
* @dev Crowdsale is a base contract for managing a token crowdsale. | |
* Crowdsales have a start and end timestamps, where investors can make | |
* token purchases and the crowdsale will assign them tokens based | |
* on a token per ETH rate. Funds collected are forwarded to a wallet | |
* as they arrive. | |
*/ | |
contract Crowdsale { | |
using SafeMath for uint256; | |
// The token being sold | |
AlttradexToken public token; | |
// start and end timestamps where investments are allowed (both inclusive) | |
uint256 public startTime; | |
uint256 public endTime; | |
// address where funds are collected | |
address public wallet; | |
// how many token units a buyer gets per wei | |
uint256 public rate; | |
uint256 public tokensSold; | |
// amount of raised money in wei | |
uint256 public weiRaised; | |
/** | |
* 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); | |
function Crowdsale(uint256 _startTime, uint256 _endTime, uint256 _rate, address _wallet, address _tokenAddress) { | |
require(_endTime >= _startTime); | |
require(_rate > 0); | |
require(_wallet != 0x0); | |
require(_tokenAddress != 0x0); | |
token = AlttradexToken(_tokenAddress); | |
startTime = _startTime; | |
endTime = _endTime; | |
rate = _rate; | |
wallet = _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(validPurchase()); | |
require(minAllowed()); | |
// amount of wei received | |
uint256 weiAmount = msg.value; | |
// amount of eth received | |
// calculate token amount to be transferred | |
uint256 tokens = weiAmount.mul(rate); | |
uint256 bonusTokens = 0; | |
if (belowBonusCap()) { | |
bonusTokens = tokens.div(5); | |
} | |
tokens = tokens.add(bonusTokens); | |
// update state | |
weiRaised = weiRaised.add(weiAmount); | |
// transfers tokens to the beneficiary | |
assert(token.transfer(beneficiary, tokens)); | |
tokensSold = tokensSold.add(tokens); | |
TokenPurchase(msg.sender, beneficiary, weiAmount, tokens); | |
forwardFunds(); | |
} | |
// send ether to the fund collection wallet | |
// override to create custom fund forwarding mechanisms | |
function forwardFunds() internal { | |
wallet.transfer(msg.value); | |
} | |
function minAllowed() internal constant returns (bool) { | |
return msg.value > 100000000000000000; | |
} | |
// we're adding a 20% bonus of ATXT for the first million USD worth of ETH sold | |
function belowBonusCap() internal constant returns (bool) { | |
return weiRaised < 3355000000000000000000; | |
} | |
// @return true if the transaction can buy tokens | |
function validPurchase() internal constant returns (bool) { | |
bool withinPeriod = now >= startTime && now <= endTime; | |
bool nonZeroPurchase = msg.value != 0; | |
return withinPeriod && nonZeroPurchase; | |
} | |
// @return true if crowdsale event has ended | |
function hasEnded() public constant returns (bool) { | |
return now > endTime; | |
} | |
function tokensSold() public constant returns(uint256) { | |
return tokensSold; | |
} | |
} | |
/** | |
* @title CappedCrowdsale | |
* @dev Extension of Crowdsale with a max amount of funds raised | |
*/ | |
contract CappedCrowdsale is Crowdsale { | |
using SafeMath for uint256; | |
uint256 public cap; | |
function CappedCrowdsale(uint256 _cap) { | |
require(_cap > 0); | |
cap = _cap; | |
} | |
// overriding Crowdsale#validPurchase to add extra cap logic | |
// @return true if investors can buy at the moment | |
function validPurchase() internal constant returns (bool) { | |
bool withinCap = weiRaised.add(msg.value) <= cap; | |
return super.validPurchase() && withinCap; | |
} | |
// overriding Crowdsale#hasEnded to add cap logic | |
// @return true if crowdsale event has ended | |
function hasEnded() public constant returns (bool) { | |
bool capReached = weiRaised >= cap; | |
return super.hasEnded() || capReached; | |
} | |
} | |
/** | |
* @title FinalizableCrowdsale | |
* @dev Extension of Crowdsale where an owner can do extra work | |
* after finishing. | |
*/ | |
contract FinalizableCrowdsale is Crowdsale, Ownable { | |
using SafeMath for uint256; | |
bool public isFinalized = false; | |
AlttradexToken alttradexToken; | |
event Finalized(); | |
/** | |
* @dev Must be called after crowdsale ends, to do some extra finalization | |
* work. Calls the contract's finalization function. | |
*/ | |
function finalize() onlyOwner public { | |
require(!isFinalized); | |
require(hasEnded()); | |
finalization(); | |
Finalized(); | |
burnTokens(); | |
isFinalized = true; | |
} | |
/** | |
* @dev Will burn all the leftover (unsold) tokens | |
*/ | |
function burnTokens() internal { | |
token.burn(token.balanceOf(this)); | |
} | |
/** | |
* @dev Can be overridden to add finalization logic. The overriding function | |
* should call super.finalization() to ensure the chain of finalization is | |
* executed entirely. | |
*/ | |
function finalization() internal { | |
} | |
} | |
/** | |
* @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 RefundableCrowdsale | |
* @dev Extension of Crowdsale contract that adds a funding goal, and | |
* the possibility of users getting a refund if goal is not met. | |
* Uses a RefundVault as the crowdsale's vault. | |
*/ | |
contract RefundableCrowdsale is FinalizableCrowdsale { | |
using SafeMath for uint256; | |
// minimum amount of funds to be raised in weis | |
uint256 public goal; | |
// refund vault used to hold funds while crowdsale is running | |
RefundVault public vault; | |
function RefundableCrowdsale(uint256 _goal) { | |
require(_goal > 0); | |
vault = new RefundVault(wallet); | |
goal = _goal; | |
} | |
// We're overriding the fund forwarding from Crowdsale. | |
// In addition to sending the funds, we want to call | |
// the RefundVault deposit function | |
function forwardFunds() internal { | |
vault.deposit.value(msg.value)(msg.sender); | |
} | |
// if crowdsale is unsuccessful, investors can claim refunds here | |
function claimRefund() public { | |
require(isFinalized); | |
require(!goalReached()); | |
vault.refund(msg.sender); | |
} | |
// vault finalization task, called when owner calls finalize() | |
function finalization() internal { | |
if (goalReached()) { | |
vault.close(); | |
} else { | |
vault.enableRefunds(); | |
} | |
super.finalization(); | |
} | |
function goalReached() public constant returns (bool) { | |
return weiRaised >= goal; | |
} | |
} | |
/** | |
* @title AlttradexCrowdsale | |
* @dev Creates capped, refundable and finalizable crowdsale. | |
* _startTime - Crowdsale Start timestamp; | |
* _endTime - Crowdsale Start timestamp | |
* _rate - Sold Token rate | |
* _goal - Crowdsale goal in wei | |
* _cap - Crowdsale cap in wei | |
* _wallet - multisig wallet where eth is going to land | |
* _tokenAddress - Sold Token address | |
*/ | |
contract AlttradexCrowdsale is CappedCrowdsale, RefundableCrowdsale { | |
function AlttradexCrowdsale(uint256 _startTime, uint256 _endTime, uint256 _rate, uint256 _goal, uint256 _cap, address _wallet, address _tokenAddress) | |
CappedCrowdsale(_cap) | |
FinalizableCrowdsale() | |
RefundableCrowdsale(_goal) | |
Crowdsale(_startTime, _endTime, _rate, _wallet, _tokenAddress) | |
{ | |
//As goal needs to be met for a successful crowdsale | |
//the value needs to less or equal than a cap which is limit for accepted funds | |
require(_goal <= _cap); | |
} | |
} | |
contract AlttradexTokenLockup { | |
using SafeMath for uint256; | |
AlttradexToken alttradexToken; | |
// beneficiary of tokens after they are released | |
address public beneficiary; | |
// timestamp when token release is enabled | |
uint256 public releaseTime; | |
function AlttradexTokenLockup(address _tokenContractAddress, address _beneficiary) { | |
require(_tokenContractAddress != address(0)); | |
require(_beneficiary != address(0)); | |
// 72 weeks = 18 months | |
releaseTime = now.add(72 weeks); | |
alttradexToken = AlttradexToken(_tokenContractAddress); | |
beneficiary = _beneficiary; | |
} | |
/** | |
* @notice Transfers tokens held by timelock to beneficiary. | |
*/ | |
function release() { | |
require(now >= releaseTime); | |
uint256 balance = alttradexToken.balanceOf(this); | |
require(balance > 0); | |
assert(alttradexToken.transfer(beneficiary, balance)); | |
} | |
function fundsAreAvailable() constant returns (bool) { | |
return now >= releaseTime; | |
} | |
} |
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