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February 18, 2018 11:37
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pragma solidity ^0.4.18; | |
/** | |
* @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) { | |
if (a == 0) { | |
return 0; | |
} | |
uint256 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 c; | |
} | |
/** | |
* @dev Substracts 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) { | |
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 { | |
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(_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 view returns (uint256 balance) { | |
return balances[_owner]; | |
} | |
} | |
/** | |
* @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) { | |
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 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, uint _addedValue) public returns (bool) { | |
allowed[msg.sender][_spender] = allowed[msg.sender][_spender].add(_addedValue); | |
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, uint _subtractedValue) public returns (bool) { | |
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 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; | |
/** | |
* @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 { | |
require(newOwner != address(0)); | |
owner = newOwner; | |
} | |
} | |
/** | |
* @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 { | |
address public saleAgent = address(0); | |
event Mint(address indexed to, uint256 amount); | |
event MintFinished(); | |
bool public mintingFinished = false; | |
modifier canMint() { | |
require(!mintingFinished); | |
_; | |
} | |
/** | |
* @dev Throws if called by any account other than the owner. | |
*/ | |
modifier onlySaleAgent() { | |
require(msg.sender == saleAgent || msg.sender == owner); | |
_; | |
} | |
function setSaleAgent(address _saleAgent) onlySaleAgent { | |
saleAgent = _saleAgent; | |
} | |
/** | |
* @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) onlySaleAgent canMint public returns (bool) { | |
totalSupply_ = totalSupply_.add(_amount); | |
balances[_to] = balances[_to].add(_amount); | |
Mint(_to, _amount); | |
Transfer(address(0), _to, _amount); | |
return true; | |
} | |
/** | |
* @dev Function to stop minting new tokens. | |
* @return True if the operation was successful. | |
*/ | |
function finishMinting() onlyOwner canMint public returns (bool) { | |
mintingFinished = true; | |
MintFinished(); | |
return true; | |
} | |
} | |
/* creating token removed | |
contract trueToken is MintableToken { | |
string public constant name = "True Token"; | |
string public constant symbol = "TRU"; | |
uint8 public constant decimals = 18; | |
} */ | |
/** | |
* @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. The contract requires a MintableToken that will be | |
* minted as contributions arrive, note that the crowdsale contract | |
* must be owner of the token in order to be able to mint it. | |
*/ | |
contract Crowdsale { | |
using SafeMath for uint256; | |
// The token being sold | |
MintableToken public token; //= MintableToken(*your contract here*); | |
// start and end timestamps where investments are allowed (both inclusive) | |
uint256 public constant startTime; //= *set the start time here*; | |
uint256 public constant endTime; //= *set the end time here*; | |
// address where funds are collected | |
address public constant wallet; //= *set the wallet for the preSale here*; | |
// how many token units a buyer gets per wei | |
uint256 public constant rate; //= *set the rate of coin here*; | |
// 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); | |
// fallback function can be used to buy tokens | |
function () external payable { | |
buyTokens(msg.sender); | |
} | |
// low level token purchase function | |
function buyTokens(address beneficiary) public payable { | |
require(beneficiary != address(0)); | |
require(validPurchase()); | |
uint256 weiAmount = msg.value; | |
// calculate token amount to be created | |
uint256 tokens = getTokenAmount(weiAmount); | |
// update state | |
weiRaised = weiRaised.add(weiAmount); | |
token.mint(beneficiary, tokens); | |
TokenPurchase(msg.sender, beneficiary, weiAmount, tokens); | |
forwardFunds(); | |
} | |
// @return true if crowdsale event has ended | |
function hasEnded() public view returns (bool) { | |
return now > endTime; | |
} | |
// Override this method to have a way to add business logic to your crowdsale when buying | |
function getTokenAmount(uint256 weiAmount) internal view returns(uint256) { | |
return weiAmount.mul(rate); | |
} | |
// send ether to the fund collection wallet | |
// override to create custom fund forwarding mechanisms | |
function forwardFunds() internal { | |
wallet.transfer(msg.value); | |
} | |
// @return true if the transaction can buy tokens | |
function validPurchase() internal view returns (bool) { | |
bool withinPeriod = now >= startTime && now <= endTime; | |
bool nonZeroPurchase = msg.value != 0; | |
return withinPeriod && nonZeroPurchase; | |
} | |
} | |
/** | |
* @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) public { | |
require(_wallet != 0x0); | |
state = State.Active; | |
wallet = _wallet; | |
} | |
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 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; | |
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(); | |
isFinalized = true; | |
} | |
/** | |
* @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 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; | |
// march 1 00:00 GMT | |
uint public bonus20end; // = 1518776400; *set bonus dates here | |
// april 1 00:00 GMT | |
uint public bonus15end; // = 1518777000; *set bonus dates here | |
// may 1 00:00 GMT | |
uint public bonus10end; // = 1518777600; *set bonus dates here | |
// may 1 00:00 GMT | |
uint public bonus5end; // = 1518778200; *set bonus dates here | |
// maximum amount of funds to be raised in weis | |
uint256 public cap; //= Х * (1 ether); *set the goal of preSale (on Ether) instead of Х*; | |
// minimum amount of funds to be raised in weis | |
uint256 public goal; //= Х * (1 ether); *set the goal of preSale (on Ether) instead of Х*; | |
// refund vault used to hold funds while crowdsale is running | |
RefundVault public vault; | |
// address where funds are collected | |
address wallet; //= *set the wallet for the preSale here*; | |
function RefundableCrowdsale() public { | |
vault = new RefundVault(wallet); | |
} | |
// overriding Crowdsale#hasEnded to add cap logic | |
// @return true if crowdsale event has ended | |
function hasEnded() public view returns (bool) { | |
bool capReached = weiRaised >= cap; | |
return capReached || super.hasEnded(); | |
} | |
// overriding Crowdsale#validPurchase to add extra cap logic | |
// @return true if investors can buy at the moment | |
function validPurchase() internal view returns (bool) { | |
bool withinCap = weiRaised.add(msg.value) <= cap; | |
return withinCap && super.validPurchase(); | |
} | |
// if crowdsale is unsuccessful, investors can claim refunds here | |
function claimRefund() public { | |
require(isFinalized); | |
require(!goalReached()); | |
vault.refund(msg.sender); | |
} | |
function goalReached() public view returns (bool) { | |
return weiRaised >= 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); | |
} | |
// vault finalization task, called when owner calls finalize() | |
function finalization() internal { | |
if (goalReached()) { | |
vault.close(); | |
} else { | |
vault.enableRefunds(); | |
} | |
super.finalization(); | |
} | |
// Override this method to have a way to add business logic to your crowdsale when buying | |
function getTokenAmount(uint256 weiAmount) internal view returns(uint256) { | |
return super.getTokenAmount(weiAmount).mul(100 + getCurrentBonus() + getBonusByEther(weiAmount)).div(100); | |
} | |
function getCurrentBonus() public view returns (uint) { | |
if (now < bonus20end) return 20; | |
if (now < bonus15end) return 15; | |
if (now < bonus10end) return 10; | |
if (now < bonus5end) return 5; | |
return 0; | |
} | |
function getBonusByEther(uint256 weiAmount) public view returns (uint) { | |
if (weiAmount >= 1 * (1 ether)) return 10; | |
if (weiAmount >= 2 * (1 ether)) return 20; | |
if (weiAmount >= 5 * (1 ether)) return 50; | |
return 0; | |
} | |
} |
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pragma solidity ^0.4.18; | |
/** | |
* @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) { | |
if (a == 0) { | |
return 0; | |
} | |
uint256 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 c; | |
} | |
/** | |
* @dev Substracts 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) { | |
uint256 c = a + b; | |
assert(c >= a); | |
return c; | |
} | |
} | |
/** | |
* @title ERC20Basic | |
* @dev 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(_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 view returns (uint256 balance) { | |
return balances[_owner]; | |
} | |
} | |
/** | |
* @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) { | |
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 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, uint _addedValue) public returns (bool) { | |
allowed[msg.sender][_spender] = allowed[msg.sender][_spender].add(_addedValue); | |
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, uint _subtractedValue) public returns (bool) { | |
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 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; | |
/** | |
* @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 { | |
require(newOwner != address(0)); | |
owner = newOwner; | |
} | |
} | |
/** | |
* @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 { | |
/* creating a token */ | |
string public constant name = "True Token"; | |
string public constant symbol = "TRU"; | |
uint8 public constant decimals = 18; | |
/* creating a saleAgent */ | |
address public saleAgent = address(0); | |
event Mint(address indexed to, uint256 amount); | |
event MintFinished(); | |
bool public mintingFinished = false; | |
modifier canMint() { | |
require(!mintingFinished); | |
_; | |
} | |
/* this modifier makes a new saleAgent | |
can be used only by saleAgent or owner | |
saleAgent isn't setted in this stage therefore only owner */ | |
modifier onlySaleAgent() { | |
require(msg.sender == saleAgent || msg.sender == owner); | |
_; | |
} | |
function setSaleAgent(address _saleAgent) onlySaleAgent { | |
saleAgent = _saleAgent; | |
} | |
/** | |
* @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) onlySaleAgent canMint public returns (bool) { | |
totalSupply_ = totalSupply_.add(_amount); | |
balances[_to] = balances[_to].add(_amount); | |
Mint(_to, _amount); | |
Transfer(address(0), _to, _amount); | |
return true; | |
} | |
/** | |
* @dev Function to stop minting new tokens. | |
* @return True if the operation was successful. | |
*/ | |
function finishMinting() onlyOwner canMint public returns (bool) { | |
mintingFinished = true; | |
MintFinished(); | |
return true; | |
} | |
} | |
/* creating a token was moved to function "MintableToken" | |
contract trueToken is MintableToken { | |
string public constant name = "True Token"; | |
string public constant symbol = "TRU"; | |
uint8 public constant decimals = 18; | |
} */ | |
/** | |
* @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. The contract requires a MintableToken that will be | |
* minted as contributions arrive, note that the crowdsale contract | |
* must be owner of the token in order to be able to mint it. | |
*/ | |
contract Crowdsale { | |
using SafeMath for uint256; | |
// The token being sold | |
MintableToken public token; | |
// start and end timestamps where investments are allowed (both inclusive) | |
uint256 public constant startTime; //= *set the start time here*; | |
uint256 public constant endTime; //= *set the end time here*; | |
// address where funds are collected | |
address public constant wallet; //= *set the wallet for the preSale here*; | |
// how many token units a buyer gets per wei | |
uint256 public constant rate; //= *set the rate of coin here*; | |
// 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); | |
/* some changes */ | |
function Crowdsale() public { | |
token = createTokenContract(); | |
token.setSaleAgent(msg.sender); | |
} | |
// creates the token to be sold. | |
// override this method to have crowdsale of a specific mintable token. | |
function createTokenContract() internal returns (MintableToken) { | |
return new MintableToken(); | |
} | |
// fallback function can be used to buy tokens | |
function () external payable { | |
buyTokens(msg.sender); | |
} | |
// low level token purchase function | |
function buyTokens(address beneficiary) public payable { | |
require(beneficiary != address(0)); | |
require(validPurchase()); | |
uint256 weiAmount = msg.value; | |
// calculate token amount to be created | |
uint256 tokens = getTokenAmount(weiAmount); | |
// update state | |
weiRaised = weiRaised.add(weiAmount); | |
token.mint(beneficiary, tokens); | |
TokenPurchase(msg.sender, beneficiary, weiAmount, tokens); | |
forwardFunds(); | |
} | |
// @return true if crowdsale event has ended | |
function hasEnded() public view returns (bool) { | |
return now > endTime; | |
} | |
// Override this method to have a way to add business logic to your crowdsale when buying | |
function getTokenAmount(uint256 weiAmount) internal view returns(uint256) { | |
return weiAmount.mul(rate); | |
} | |
// send ether to the fund collection wallet | |
// override to create custom fund forwarding mechanisms | |
function forwardFunds() internal { | |
wallet.transfer(msg.value); | |
} | |
// @return true if the transaction can buy tokens | |
function validPurchase() internal view returns (bool) { | |
bool withinPeriod = now >= startTime && now <= endTime; | |
bool nonZeroPurchase = msg.value != 0; | |
return withinPeriod && nonZeroPurchase; | |
} | |
} | |
/** | |
* @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) public { | |
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 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; | |
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(); | |
isFinalized = true; | |
} | |
/** | |
* @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 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; | |
// maximum amount of funds to be raised in weis | |
uint256 public cap; //= Х * (1 ether); *set the goal of preSale (on Ether) instead of Х*; | |
// minimum amount of funds to be raised in weis | |
uint256 public goal; //= Х * (1 ether); *set the goal of preSale (on Ether) instead of Х*; | |
// refund vault used to hold funds while crowdsale is running | |
RefundVault public vault; | |
// address where funds are collected | |
address wallet; //= *set the wallet for the preSale here*; | |
function RefundableCrowdsale() public { | |
vault = new RefundVault(wallet); | |
} | |
// overriding Crowdsale#hasEnded to add cap logic | |
// @return true if crowdsale event has ended | |
function hasEnded() public view returns (bool) { | |
bool capReached = weiRaised >= cap; | |
return capReached || super.hasEnded(); | |
} | |
// overriding Crowdsale#validPurchase to add extra cap logic | |
// @return true if investors can buy at the moment | |
function validPurchase() internal view returns (bool) { | |
bool withinCap = weiRaised.add(msg.value) <= cap; | |
return withinCap && super.validPurchase(); | |
} | |
/* function RefundableCrowdsale(uint256 _goal) public { | |
require(_goal > 0); | |
vault = new RefundVault(wallet); | |
goal = _goal; | |
} */ | |
// if crowdsale is unsuccessful, investors can claim refunds here | |
function claimRefund() public { | |
require(isFinalized); | |
require(!goalReached()); | |
vault.refund(msg.sender); | |
} | |
function goalReached() public view returns (bool) { | |
return weiRaised >= goal; | |
} | |
// vault finalization task, called when owner calls finalize() | |
function finalization() internal { | |
if (goalReached()) { | |
vault.close(); | |
} else { | |
vault.enableRefunds(); | |
} | |
super.finalization(); | |
} | |
// 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); | |
} | |
} |
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