Contract Source Code:
File 1 of 1 : OAKToken
pragma solidity 0.4.18;
// File: zeppelin-solidity/contracts/ownership/Ownable.sol
/**
* @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() public {
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) public onlyOwner {
require(newOwner != address(0));
OwnershipTransferred(owner, newOwner);
owner = newOwner;
}
}
// File: zeppelin-solidity/contracts/math/SafeMath.sol
/**
* @title SafeMath
* @dev Math operations with safety checks that throw on error
*/
library SafeMath {
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;
}
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;
}
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
assert(b <= a);
return a - b;
}
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
assert(c >= a);
return c;
}
}
// File: zeppelin-solidity/contracts/token/ERC20Basic.sol
/**
* @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 view returns (uint256);
function transfer(address to, uint256 value) public returns (bool);
event Transfer(address indexed from, address indexed to, uint256 value);
}
// File: zeppelin-solidity/contracts/token/BasicToken.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 view returns (uint256 balance) {
return balances[_owner];
}
}
// File: zeppelin-solidity/contracts/token/ERC20.sol
/**
* @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);
}
// File: zeppelin-solidity/contracts/token/StandardToken.sol
/**
* @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];
}
/**
* 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) {
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) {
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;
}
}
// File: zeppelin-solidity/contracts/token/MintableToken.sol
/**
* @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(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;
}
}
// File: contracts/OAKToken.sol
contract OAKToken is MintableToken {
string public name = "Acorn Collective Token";
string public symbol = "OAK";
uint256 public decimals = 18;
mapping(address => bool) public kycRequired;
// overriding MintableToken#mint to add kyc logic
function mint(address _to, uint256 _amount) onlyOwner canMint public returns (bool) {
kycRequired[_to] = true;
return super.mint(_to, _amount);
}
// overriding MintableToken#transfer to add kyc logic
function transfer(address _to, uint _value) public returns (bool) {
require(!kycRequired[msg.sender]);
return super.transfer(_to, _value);
}
// overriding MintableToken#transferFrom to add kyc logic
function transferFrom(address _from, address _to, uint256 _value) public returns (bool) {
require(!kycRequired[_from]);
return super.transferFrom(_from, _to, _value);
}
function kycVerify(address participant) onlyOwner public {
kycRequired[participant] = false;
KycVerified(participant);
}
event KycVerified(address indexed participant);
}
// File: contracts/Crowdsale.sol
/**
* @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
OAKToken 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;
// 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) public {
require(_startTime >= now);
require(_endTime >= _startTime);
require(_rate > 0);
require(_wallet != address(0));
token = createTokenContract();
startTime = _startTime;
endTime = _endTime;
rate = _rate;
wallet = _wallet;
}
// creates the token to be sold.
// override this method to have crowdsale of a specific mintable token.
event CrowdSaleTokenContractCreation();
// creates the token to be sold.
function createTokenContract() internal returns (OAKToken) {
OAKToken newToken = new OAKToken();
CrowdSaleTokenContractCreation();
return newToken;
}
// 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 = weiAmount.mul(rate);
// update state
weiRaised = weiRaised.add(weiAmount);
token.mint(beneficiary, 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);
}
// @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;
}
// @return true if crowdsale event has ended
function hasEnded() public view returns (bool) {
return now > endTime;
}
}
// File: contracts/FinalizableCrowdsale.sol
/**
* @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 {
}
}
// File: zeppelin-solidity/contracts/lifecycle/Pausable.sol
/**
* @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();
}
}
// File: contracts/OAKTokenCrowdsale.sol
contract OAKTokenCrowdsale is FinalizableCrowdsale, Pausable {
uint256 public restrictedPercent;
address public restricted;
uint256 public soldTokens;
uint256 public hardCap;
uint256 public vipRate;
uint256 public totalTokenSupply;
mapping(address => bool) public vip;
//TokenTimelock logic
uint256 public Y1_lockedTokenReleaseTime;
uint256 public Y1_lockedTokenAmount;
uint256 public Y2_lockedTokenReleaseTime;
uint256 public Y2_lockedTokenAmount;
// constructor
function OAKTokenCrowdsale(uint256 _startTime, uint256 _endTime, uint256 _rate, address _wallet) public
Crowdsale(_startTime, _endTime, _rate, _wallet) {
// total token supply for sales
totalTokenSupply = 75000000 * 10 ** 18;
// hardCap for pre-sale
hardCap = 7000000 * 10 ** 18;
vipRate = _rate;
soldTokens = 0;
restrictedPercent = 20;
restricted = msg.sender;
}
// update hardCap for sale
function setHardCap(uint256 _hardCap) public onlyOwner {
require(!isFinalized);
require(_hardCap >= 0 && _hardCap <= totalTokenSupply);
hardCap = _hardCap;
}
// update address where funds are collected
function setWalletAddress(address _wallet) public onlyOwner {
require(!isFinalized);
wallet = _wallet;
}
// update token units a buyer gets per wei
function setRate(uint256 _rate) public onlyOwner {
require(!isFinalized);
require(_rate > 0);
rate = _rate;
}
// update token units a vip buyer gets per wei
function setVipRate(uint256 _vipRate) public onlyOwner {
require(!isFinalized);
require(_vipRate > 0);
vipRate = _vipRate;
}
// add VIP buyer address
function setVipAddress(address _address) public onlyOwner {
vip[_address] = true;
}
// remove VIP buyer address
function unsetVipAddress(address _address) public onlyOwner {
vip[_address] = false;
}
// update startTime, endTime for post-sales
function setSalePeriod(uint256 _startTime, uint256 _endTime) public onlyOwner {
require(!isFinalized);
require(_startTime > 0);
require(_endTime > _startTime);
startTime = _startTime;
endTime = _endTime;
}
// fallback function can be used to buy tokens
function () external payable {
buyTokens(msg.sender);
}
// overriding Crowdsale#buyTokens to add pausable sales and vip logic
function buyTokens(address beneficiary) public whenNotPaused payable {
require(beneficiary != address(0));
require(!isFinalized);
uint256 weiAmount = msg.value;
uint tokens;
if(vip[msg.sender] == true){
tokens = weiAmount.mul(vipRate);
}else{
tokens = weiAmount.mul(rate);
}
require(validPurchase(tokens));
soldTokens = soldTokens.add(tokens);
// update state
weiRaised = weiRaised.add(weiAmount);
token.mint(beneficiary, tokens);
TokenPurchase(msg.sender, beneficiary, weiAmount, tokens);
forwardFunds();
}
// overriding Crowdsale#validPurchase to add capped sale logic
// @return true if the transaction can buy tokens
function validPurchase(uint256 tokens) internal view returns (bool) {
bool withinPeriod = now >= startTime && now <= endTime;
bool withinCap = soldTokens.add(tokens) <= hardCap;
bool withinTotalSupply = soldTokens.add(tokens) <= totalTokenSupply;
bool nonZeroPurchase = msg.value != 0;
return withinPeriod && nonZeroPurchase && withinCap && withinTotalSupply;
}
// overriding FinalizableCrowdsale#finalization to add 20% of sold token for owner
function finalization() internal {
// mint locked token to Crowdsale contract
uint256 restrictedTokens = soldTokens.div(100).mul(restrictedPercent);
token.mint(this, restrictedTokens);
token.kycVerify(this);
Y1_lockedTokenReleaseTime = now + 1 years;
Y1_lockedTokenAmount = restrictedTokens.div(2);
Y2_lockedTokenReleaseTime = now + 2 years;
Y2_lockedTokenAmount = restrictedTokens.div(2);
// stop minting new tokens
token.finishMinting();
// transfer the contract ownership to OAKTokenCrowdsale.owner
token.transferOwnership(owner);
}
// release the 1st year locked token
function Y1_release() onlyOwner public {
require(Y1_lockedTokenAmount > 0);
require(now > Y1_lockedTokenReleaseTime);
// transfer the locked token to restricted
token.transfer(restricted, Y1_lockedTokenAmount);
Y1_lockedTokenAmount = 0;
}
// release the 2nd year locked token
function Y2_release() onlyOwner public {
require(Y1_lockedTokenAmount == 0);
require(Y2_lockedTokenAmount > 0);
require(now > Y2_lockedTokenReleaseTime);
uint256 amount = token.balanceOf(this);
require(amount > 0);
// transfer the locked token to restricted
token.transfer(restricted, amount);
Y2_lockedTokenAmount = 0;
}
function kycVerify(address participant) onlyOwner public {
token.kycVerify(participant);
}
function addPrecommitment(address participant, uint balance) onlyOwner public {
require(!isFinalized);
require(balance > 0);
// Check if the total token supply will be exceeded
require(soldTokens.add(balance) <= totalTokenSupply);
soldTokens = soldTokens.add(balance);
token.mint(participant, balance);
}
}