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IungoToken.sol
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IungoToken.sol
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pragma solidity 0.4.18;
/**
* @title SafeMath
* @dev Math operations with safety checks that throw on error
*/
library SafeMath {
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a * b;
require(a == 0 || 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) {
require(b <= a);
return a - b;
}
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
require(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 view returns (uint256);
function transfer(address to, uint256 value) public returns (bool);
event Transfer(address indexed from, address indexed to, uint256 value);
}
/**
* @title Basic token
* @dev Basic version of StandardToken, with no allowances.
*/
contract BasicToken is ERC20Basic {
using SafeMath for uint256;
mapping(address => uint256) public 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];
}
}
/**
* @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 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 TokenTimelock
* @dev TokenTimelock is a token holder contract that will allow a
* beneficiary to extract the tokens after a given release time
*/
contract TokenTimelock {
using SafeERC20 for ERC20Basic;
// ERC20 basic token contract being held
ERC20Basic public token;
// beneficiary of tokens after they are released
address public beneficiary;
// timestamp when token release is enabled
uint64 public releaseTime;
function TokenTimelock(ERC20Basic _token, address _beneficiary, uint64 _releaseTime) public {
require(_releaseTime > uint64(block.timestamp));
token = _token;
beneficiary = _beneficiary;
releaseTime = _releaseTime;
}
/**
* @notice Transfers tokens held by timelock to beneficiary.
*/
function release() public {
require(uint64(block.timestamp) >= releaseTime);
uint256 amount = token.balanceOf(this);
require(amount > 0);
token.safeTransfer(beneficiary, amount);
}
}
/**
* @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 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;
}
}
contract Owned {
address public owner;
function Owned() public {
owner = msg.sender;
}
modifier onlyOwner {
require(msg.sender == owner);
_;
}
}
contract IungoToken is StandardToken, Owned {
string public constant name = "IUNGO token";
string public constant symbol = "ING";
uint8 public constant decimals = 18;
/// Maximum tokens to be allocated (100 million)
uint256 public constant HARD_CAP = 100000000 * 10**uint256(decimals);
/// Maximum tokens to be allocated on the sale (64 million)
uint256 public constant TOKENS_SALE_HARD_CAP = 64000000 * 10**uint256(decimals);
/// The owner of this address is the Iungo Founders fund
address public foundersFundAddress;
/// The owner of this address is the Iungo Team Foundation fund
address public teamFundAddress;
/// The owner of this address is the Reserve fund
address public reserveFundAddress;
/// This address will be sent all the received ether
address public fundsTreasury;
/// This is the address of the timelock contract for
/// the first 1/3 of the Founders fund tokens
address public foundersFundTimelock1Address;
/// This is the address of the timelock contract for
/// the second 1/3 of the Founders fund tokens
address public foundersFundTimelock2Address;
/// This is the address of the timelock contract for
/// the third 1/3 of the Founders fund tokens
address public foundersFundTimelock3Address;
/// seconds since 01.01.1970 to 06.12.2017 12:00:00 UTC
/// tier 1 start time
uint64 private constant date06Dec2017 = 1512561600;
/// seconds since 01.01.1970 to 21.12.2017 14:00:00 UTC
/// tier 1 end time; tier 2 start time
uint64 private constant date21Dec2017 = 1513864800;
/// seconds since 01.01.1970 to 12.01.2018 14:00:00 UTC
/// tier 2 end time; tier 3 start time
uint64 private constant date12Jan2018 = 1515765600;
/// seconds since 01.01.1970 to 21.01.2018 14:00:00 UTC
/// tier 3 end time; tier 4 start time
uint64 private constant date21Jan2018 = 1516543200;
/// seconds since 01.01.1970 to 31.01.2018 23:59:59 UTC
/// tier 4 end time; closing token sale; trading open
uint64 private constant date31Jan2018 = 1517443199;
/// Base exchange rate is set to 1 ETH = 1000 ING
uint256 public constant BASE_RATE = 1000;
/// no tokens can be ever issued when this is set to "true"
bool public tokenSaleClosed = false;
/// Issue event index starting from 0.
uint256 public issueIndex = 0;
/// Emitted for each sucuessful token purchase.
event Issue(uint _issueIndex, address addr, uint tokenAmount);
/// Require that the buyers can still purchase
modifier inProgress {
require(totalSupply < TOKENS_SALE_HARD_CAP
&& !tokenSaleClosed
&& !saleDue());
_;
}
/// Allow the closing to happen only once
modifier beforeEnd {
require(!tokenSaleClosed);
_;
}
/// Require that the end of the sale has passed (time is 01 Feb 2018 or later)
modifier tradingOpen {
require(saleDue());
_;
}
/**
* CONSTRUCTOR
*
* @dev Initialize the IungoToken Token
* @param _foundersFundAddress The owner of this address is the Iungo Founders fund
* @param _teamFundAddress The owner of this address is the Iungo Team Foundation fund
* @param _reserveFundAddress The owner of this address is the Reserve fund
*/
function IungoToken (address _foundersFundAddress, address _teamFundAddress,
address _reserveFundAddress, address _fundsTreasury) public {
foundersFundAddress = 0x9CB0016511Fb93EAc7bC585A2bc2f0C34DEcEa15;
teamFundAddress = 0xDda7003998244f6161A5BBAf0F4ed5a40E908b51;
reserveFundAddress = 0x9186b48Db83E63adEDaB43C19345f39c83928E3f;
fundsTreasury = 0x31a633c4eE2C317DE2C65beb00593EAdD9f172d6;
}
/// @dev Returns the current price.
function price() public view returns (uint256 tokens) {
return computeTokenAmount(1 ether);
}
/// @dev This default function allows token to be purchased by directly
/// sending ether to this smart contract.
function () public payable {
purchaseTokens(msg.sender);
}
/// @dev Issue token based on Ether received.
/// @param _beneficiary Address that newly issued token will be sent to.
function purchaseTokens(address _beneficiary) public payable inProgress {
// only accept a minimum amount of ETH?
require(msg.value >= 0.01 ether);
uint256 tokens = computeTokenAmount(msg.value);
doIssueTokens(_beneficiary, tokens);
/// forward the raised funds to the fund address
fundsTreasury.transfer(msg.value);
}
/// @dev Batch issue tokens on the presale
/// @param _addresses addresses that the presale tokens will be sent to.
/// @param _addresses the amounts of tokens, with decimals expanded (full).
function issueTokensMulti(address[] _addresses, uint256[] _tokens) public onlyOwner inProgress {
require(_addresses.length == _tokens.length);
require(_addresses.length <= 100);
for (uint256 i = 0; i < _tokens.length; i = i.add(1)) {
doIssueTokens(_addresses[i], _tokens[i]);
}
}
/// @dev Issue tokens for a single buyer on the presale
/// @param _beneficiary addresses that the presale tokens will be sent to.
/// @param _tokensAmount the amount of tokens, with decimals expanded (full).
function issueTokens(address _beneficiary, uint256 _tokensAmount) public onlyOwner inProgress {
doIssueTokens(_beneficiary, _tokensAmount);
}
/// @dev issue tokens for a single buyer
/// @param _beneficiary addresses that the tokens will be sent to.
/// @param _tokensAmount the amount of tokens, with decimals expanded (full).
function doIssueTokens(address _beneficiary, uint256 _tokensAmount) internal {
require(_beneficiary != address(0));
// compute without actually increasing it
uint256 increasedTotalSupply = totalSupply.add(_tokensAmount);
// roll back if hard cap reached
require(increasedTotalSupply <= TOKENS_SALE_HARD_CAP);
// increase token total supply
totalSupply = increasedTotalSupply;
// update the buyer's balance to number of tokens sent
balances[_beneficiary] = balances[_beneficiary].add(_tokensAmount);
// event is fired when tokens issued
Issue(
issueIndex++,
_beneficiary,
_tokensAmount
);
}
/// @dev Compute the amount of ING token that can be purchased.
/// @param ethAmount Amount of Ether to purchase ING.
/// @return Amount of ING token to purchase
function computeTokenAmount(uint256 ethAmount) internal view returns (uint256 tokens) {
/// the percentage value (0-100) of the discount for each tier
uint64 discountPercentage = currentTierDiscountPercentage();
uint256 tokenBase = ethAmount.mul(BASE_RATE);
uint256 tokenBonus = tokenBase.mul(discountPercentage).div(100);
tokens = tokenBase.add(tokenBonus);
}
/// @dev Determine the current sale tier.
/// @return the index of the current sale tier.
function currentTierDiscountPercentage() internal view returns (uint64) {
uint64 _now = uint64(block.timestamp);
require(_now <= date31Jan2018);
if(_now > date21Jan2018) return 0;
if(_now > date12Jan2018) return 15;
if(_now > date21Dec2017) return 35;
return 50;
}
// function getnow() public view returns (uint64) {
// return uint64(block.timestamp);
// }
//
// function setnow(uint64 time) public {
// _now = time;
// }
/// @dev Finalize the sale and distribute the reserve, team tokens, lock the founders tokens
function close() public onlyOwner beforeEnd {
uint64 _now = uint64(block.timestamp);
/// Final (sold tokens) / (team + reserve + founders funds tokens) = 64 / 36 proportion = 0.5625
/// (sold tokens) + (team + reserve + founders funds tokens) = 64% + 36% = 100%
/// Therefore, (team + reserve + founders funds tokens) = 56.25% of the sold tokens = 36% of the total tokens
uint256 totalTokens = totalSupply.add(totalSupply.mul(5625).div(10000));
/// Tokens to be allocated to the Reserve fund (12% of total ING)
uint256 reserveFundTokens = totalTokens.mul(12).div(100);
balances[reserveFundAddress] = balances[reserveFundAddress].add(reserveFundTokens);
totalSupply = totalSupply.add(reserveFundTokens);
/// fire event when tokens issued
Issue(
issueIndex++,
reserveFundAddress,
reserveFundTokens
);
/// Tokens to be allocated to the Team fund (12% of total ING)
uint256 teamFundTokens = totalTokens.mul(12).div(100);
balances[teamFundAddress] = balances[teamFundAddress].add(teamFundTokens);
totalSupply = totalSupply.add(teamFundTokens);
/// fire event when tokens issued
Issue(
issueIndex++,
teamFundAddress,
teamFundTokens
);
/// Tokens to be allocated to the locked Founders fund
/// 12% (3 x 4%) of total ING allocated to the Founders fund locked as follows:
/// first 4% locked for 6 months (183 days)
TokenTimelock lock1_6months = new TokenTimelock(this, foundersFundAddress, _now + 183*24*60*60);
foundersFundTimelock1Address = address(lock1_6months);
uint256 foundersFund1Tokens = totalTokens.mul(4).div(100);
/// update the contract balance to number of tokens issued
balances[foundersFundTimelock1Address] = balances[foundersFundTimelock1Address].add(foundersFund1Tokens);
/// increase total supply respective to the tokens issued
totalSupply = totalSupply.add(foundersFund1Tokens);
/// fire event when tokens issued
Issue(
issueIndex++,
foundersFundTimelock1Address,
foundersFund1Tokens
);
/// second 4% locked for 12 months (365 days)
TokenTimelock lock2_12months = new TokenTimelock(this, foundersFundAddress, _now + 365*24*60*60);
foundersFundTimelock2Address = address(lock2_12months);
uint256 foundersFund2Tokens = totalTokens.mul(4).div(100);
balances[foundersFundTimelock2Address] = balances[foundersFundTimelock2Address].add(foundersFund2Tokens);
/// increase total supply respective to the tokens issued
totalSupply = totalSupply.add(foundersFund2Tokens);
/// fire event when tokens issued
Issue(
issueIndex++,
foundersFundTimelock2Address,
foundersFund2Tokens
);
/// third 4% locked for 18 months (548 days)
TokenTimelock lock3_18months = new TokenTimelock(this, foundersFundAddress, _now + 548*24*60*60);
foundersFundTimelock3Address = address(lock3_18months);
uint256 foundersFund3Tokens = totalTokens.mul(4).div(100);
balances[foundersFundTimelock3Address] = balances[foundersFundTimelock3Address].add(foundersFund3Tokens);
/// increase total supply respective to the tokens issued
totalSupply = totalSupply.add(foundersFund3Tokens);
/// fire event when tokens issued
Issue(
issueIndex++,
foundersFundTimelock3Address,
foundersFund3Tokens
);
/// burn the unallocated tokens - no more tokens can be issued after this line
tokenSaleClosed = true;
/// forward the raised funds to the fund address
fundsTreasury.transfer(this.balance);
}
/// @return if the token sale is finished
function saleDue() public view returns (bool) {
return date31Jan2018 < uint64(block.timestamp);
}
/// Transfer limited by the tradingOpen modifier (time is 01 Feb 2018 or later)
function transferFrom(address _from, address _to, uint256 _value) public tradingOpen returns (bool) {
return super.transferFrom(_from, _to, _value);
}
/// Transfer limited by the tradingOpen modifier (time is 01 Feb 2018 or later)
function transfer(address _to, uint256 _value) public tradingOpen returns (bool) {
return super.transfer(_to, _value);
}
}