pragma solidity ^0.4.13;
contract Utils {
/**
constructor
*/
function Utils() {
}
// verifies that an amount is greater than zero
modifier greaterThanZero(uint256 _amount) {
require(_amount > 0);
_;
}
// validates an address - currently only checks that it isn't null
modifier validAddress(address _address) {
require(_address != 0x0);
_;
}
// verifies that the address is different than this contract address
modifier notThis(address _address) {
require(_address != address(this));
_;
}
// Overflow protected math functions
/**
@dev returns the sum of _x and _y, asserts if the calculation overflows
@param _x value 1
@param _y value 2
@return sum
*/
function safeAdd(uint256 _x, uint256 _y) internal returns (uint256) {
uint256 z = _x + _y;
assert(z >= _x);
return z;
}
/**
@dev returns the difference of _x minus _y, asserts if the subtraction results in a negative number
@param _x minuend
@param _y subtrahend
@return difference
*/
function safeSub(uint256 _x, uint256 _y) internal returns (uint256) {
assert(_x >= _y);
return _x - _y;
}
/**
@dev returns the product of multiplying _x by _y, asserts if the calculation overflows
@param _x factor 1
@param _y factor 2
@return product
*/
function safeMul(uint256 _x, uint256 _y) internal returns (uint256) {
uint256 z = _x * _y;
assert(_x == 0 || z / _x == _y);
return z;
}
}
contract IERC20Token {
// these functions aren't abstract since the compiler emits automatically generated getter functions as external
function name() public constant returns (string name) { name; }
function symbol() public constant returns (string symbol) { symbol; }
function decimals() public constant returns (uint8 decimals) { decimals; }
function totalSupply() public constant returns (uint256 totalSupply) { totalSupply; }
function balanceOf(address _owner) public constant returns (uint256 balance) { _owner; balance; }
function allowance(address _owner, address _spender) public constant returns (uint256 remaining) { _owner; _spender; remaining; }
function transfer(address _to, uint256 _value) public returns (bool success);
function transferFrom(address _from, address _to, uint256 _value) public returns (bool success);
function approve(address _spender, uint256 _value) public returns (bool success);
}
contract ERC20Token is IERC20Token, Utils {
string public standard = 'Token 0.1';
string public name = '';
string public symbol = '';
uint8 public decimals = 0;
uint256 public totalSupply = 0;
mapping (address => uint256) public balanceOf;
mapping (address => mapping (address => uint256)) public allowance;
event Transfer(address indexed _from, address indexed _to, uint256 _value);
event Approval(address indexed _owner, address indexed _spender, uint256 _value);
/**
@dev constructor
@param _name token name
@param _symbol token symbol
@param _decimals decimal points, for display purposes
*/
function ERC20Token(string _name, string _symbol, uint8 _decimals) {
require(bytes(_name).length > 0 && bytes(_symbol).length > 0); // validate input
name = _name;
symbol = _symbol;
decimals = _decimals;
}
/**
@dev send coins
throws on any error rather then return a false flag to minimize user errors
@param _to target address
@param _value transfer amount
@return true if the transfer was successful, false if it wasn't
*/
function transfer(address _to, uint256 _value)
public
validAddress(_to)
returns (bool success)
{
balanceOf[msg.sender] = safeSub(balanceOf[msg.sender], _value);
balanceOf[_to] = safeAdd(balanceOf[_to], _value);
Transfer(msg.sender, _to, _value);
return true;
}
/**
@dev an account/contract attempts to get the coins
throws on any error rather then return a false flag to minimize user errors
@param _from source address
@param _to target address
@param _value transfer amount
@return true if the transfer was successful, false if it wasn't
*/
function transferFrom(address _from, address _to, uint256 _value)
public
validAddress(_from)
validAddress(_to)
returns (bool success)
{
allowance[_from][msg.sender] = safeSub(allowance[_from][msg.sender], _value);
balanceOf[_from] = safeSub(balanceOf[_from], _value);
balanceOf[_to] = safeAdd(balanceOf[_to], _value);
Transfer(_from, _to, _value);
return true;
}
/**
@dev allow another account/contract to spend some tokens on your behalf
throws on any error rather then return a false flag to minimize user errors
also, to minimize the risk of the approve/transferFrom attack vector
(see https://docs.google.com/document/d/1YLPtQxZu1UAvO9cZ1O2RPXBbT0mooh4DYKjA_jp-RLM/), approve has to be called twice
in 2 separate transactions - once to change the allowance to 0 and secondly to change it to the new allowance value
@param _spender approved address
@param _value allowance amount
@return true if the approval was successful, false if it wasn't
*/
function approve(address _spender, uint256 _value)
public
validAddress(_spender)
returns (bool success)
{
// if the allowance isn't 0, it can only be updated to 0 to prevent an allowance change immediately after withdrawal
require(_value == 0 || allowance[msg.sender][_spender] == 0);
allowance[msg.sender][_spender] = _value;
Approval(msg.sender, _spender, _value);
return true;
}
}
contract IOwned {
// this function isn't abstract since the compiler emits automatically generated getter functions as external
function owner() public constant returns (address owner) { owner; }
function transferOwnership(address _newOwner) public;
function acceptOwnership() public;
}
contract Owned is IOwned {
address public owner;
address public newOwner;
event OwnerUpdate(address _prevOwner, address _newOwner);
/**
@dev constructor
*/
function Owned() {
owner = msg.sender;
}
// allows execution by the owner only
modifier ownerOnly {
assert(msg.sender == owner);
_;
}
/**
@dev allows transferring the contract ownership
the new owner still needs to accept the transfer
can only be called by the contract owner
@param _newOwner new contract owner
*/
function transferOwnership(address _newOwner) public ownerOnly {
require(_newOwner != owner);
newOwner = _newOwner;
}
/**
@dev used by a new owner to accept an ownership transfer
*/
function acceptOwnership() public {
require(msg.sender == newOwner);
OwnerUpdate(owner, newOwner);
owner = newOwner;
newOwner = 0x0;
}
}
contract ITokenHolder is IOwned {
function withdrawTokens(IERC20Token _token, address _to, uint256 _amount) public;
}
contract TokenHolder is ITokenHolder, Owned, Utils {
/**
@dev constructor
*/
function TokenHolder() {
}
/**
@dev withdraws tokens held by the contract and sends them to an account
can only be called by the owner
@param _token ERC20 token contract address
@param _to account to receive the new amount
@param _amount amount to withdraw
*/
function withdrawTokens(IERC20Token _token, address _to, uint256 _amount)
public
ownerOnly
validAddress(_token)
validAddress(_to)
notThis(_to)
{
assert(_token.transfer(_to, _amount));
}
}
contract SmartTokenController is TokenHolder {
ISmartToken public token; // smart token
/**
@dev constructor
*/
function SmartTokenController(ISmartToken _token)
validAddress(_token)
{
token = _token;
}
// ensures that the controller is the token's owner
modifier active() {
assert(token.owner() == address(this));
_;
}
// ensures that the controller is not the token's owner
modifier inactive() {
assert(token.owner() != address(this));
_;
}
/**
@dev allows transferring the token ownership
the new owner still need to accept the transfer
can only be called by the contract owner
@param _newOwner new token owner
*/
function transferTokenOwnership(address _newOwner) public ownerOnly {
token.transferOwnership(_newOwner);
}
/**
@dev used by a new owner to accept a token ownership transfer
can only be called by the contract owner
*/
function acceptTokenOwnership() public ownerOnly {
token.acceptOwnership();
}
/**
@dev disables/enables token transfers
can only be called by the contract owner
@param _disable true to disable transfers, false to enable them
*/
function disableTokenTransfers(bool _disable) public ownerOnly {
token.disableTransfers(_disable);
}
/**
@dev withdraws tokens held by the token and sends them to an account
can only be called by the owner
@param _token ERC20 token contract address
@param _to account to receive the new amount
@param _amount amount to withdraw
*/
function withdrawFromToken(IERC20Token _token, address _to, uint256 _amount) public ownerOnly {
token.withdrawTokens(_token, _to, _amount);
}
}
contract ISmartToken is ITokenHolder, IERC20Token {
function disableTransfers(bool _disable) public;
function issue(address _to, uint256 _amount) public;
function destroy(address _from, uint256 _amount) public;
}
contract SmartToken is ISmartToken, Owned, ERC20Token, TokenHolder {
string public version = '0.3';
bool public transfersEnabled = true; // true if transfer/transferFrom are enabled, false if not
// triggered when a smart token is deployed - the _token address is defined for forward compatibility, in case we want to trigger the event from a factory
event NewSmartToken(address _token);
// triggered when the total supply is increased
event Issuance(uint256 _amount);
// triggered when the total supply is decreased
event Destruction(uint256 _amount);
/**
@dev constructor
@param _name token name
@param _symbol token short symbol, minimum 1 character
@param _decimals for display purposes only
*/
function SmartToken(string _name, string _symbol, uint8 _decimals)
ERC20Token(_name, _symbol, _decimals)
{
NewSmartToken(address(this));
}
// allows execution only when transfers aren't disabled
modifier transfersAllowed {
assert(transfersEnabled);
_;
}
/**
@dev disables/enables transfers
can only be called by the contract owner
@param _disable true to disable transfers, false to enable them
*/
function disableTransfers(bool _disable) public ownerOnly {
transfersEnabled = !_disable;
}
/**
@dev increases the token supply and sends the new tokens to an account
can only be called by the contract owner
@param _to account to receive the new amount
@param _amount amount to increase the supply by
*/
function issue(address _to, uint256 _amount)
public
ownerOnly
validAddress(_to)
notThis(_to)
{
totalSupply = safeAdd(totalSupply, _amount);
balanceOf[_to] = safeAdd(balanceOf[_to], _amount);
Issuance(_amount);
Transfer(this, _to, _amount);
}
/**
@dev removes tokens from an account and decreases the token supply
can be called by the contract owner to destroy tokens from any account or by any holder to destroy tokens from his/her own account
@param _from account to remove the amount from
@param _amount amount to decrease the supply by
*/
function destroy(address _from, uint256 _amount) public {
require(msg.sender == _from || msg.sender == owner); // validate input
balanceOf[_from] = safeSub(balanceOf[_from], _amount);
totalSupply = safeSub(totalSupply, _amount);
Transfer(_from, this, _amount);
Destruction(_amount);
}
// ERC20 standard method overrides with some extra functionality
/**
@dev send coins
throws on any error rather then return a false flag to minimize user errors
in addition to the standard checks, the function throws if transfers are disabled
@param _to target address
@param _value transfer amount
@return true if the transfer was successful, false if it wasn't
*/
function transfer(address _to, uint256 _value) public transfersAllowed returns (bool success) {
assert(super.transfer(_to, _value));
return true;
}
/**
@dev an account/contract attempts to get the coins
throws on any error rather then return a false flag to minimize user errors
in addition to the standard checks, the function throws if transfers are disabled
@param _from source address
@param _to target address
@param _value transfer amount
@return true if the transfer was successful, false if it wasn't
*/
function transferFrom(address _from, address _to, uint256 _value) public transfersAllowed returns (bool success) {
assert(super.transferFrom(_from, _to, _value));
return true;
}
}
contract KickcityAbstractCrowdsale is Owned, SmartTokenController {
uint256 public etherHardCap = 14706 ether; // 14706 * 850 = 12500100 ~ 12.5m USD
uint256 public etherCollected = 0;
uint256 public USD_IN_ETH = 850; // We use fixed rate 1ETH = 850USD
function setUsdEthRate(uint256 newrate) ownerOnly {
USD_IN_ETH = newrate;
oneEtherInKicks = newrate * 10;
}
function usdCollected() constant public returns(uint256) {
return safeMul(etherCollected, USD_IN_ETH) / 1 ether;
}
function setHardCap(uint256 newCap) ownerOnly {
etherHardCap = newCap;
}
uint256 public saleStartTime;
uint256 public saleEndTime;
modifier duringSale() {
assert(now >= saleStartTime && now < saleEndTime);
_;
}
uint256 private maxGasPrice = 0.06 szabo; // 60 Gwei
modifier validGasPrice() {
assert(tx.gasprice <= maxGasPrice);
_;
}
address public kickcityWallet;
function KickcityAbstractCrowdsale(uint256 start, uint256 end, KickcityToken _token, address beneficiary) SmartTokenController(_token) {
assert(start < end);
assert(beneficiary != 0x0);
saleStartTime = start;
saleEndTime = end;
kickcityWallet = beneficiary;
}
/**
KICK token have 18 decimals, so we can calculate ether/kicks rate directly
*/
uint256 public oneEtherInKicks = 8500;
uint256 public minEtherContrib = 59 finney; // 0.059 ETH ~ 50.15$
function calcKicks(uint256 etherVal) constant public returns (uint256 kicksVal);
// triggered on each contribution
event Contribution(address indexed contributor, uint256 contributed, uint256 tokensReceived);
function processContribution() private validGasPrice duringSale {
uint256 leftToCollect = safeSub(etherHardCap, etherCollected);
uint256 contribution = msg.value > leftToCollect ? leftToCollect : msg.value;
uint256 change = safeSub(msg.value, contribution);
if (contribution > 0) {
uint256 kicks = calcKicks(contribution);
// transfer tokens to Kikcity wallet
kickcityWallet.transfer(contribution);
// Issue tokens to contributor
token.issue(msg.sender, kicks);
etherCollected = safeAdd(etherCollected, contribution);
Contribution(msg.sender, contribution, kicks);
}
// Give change back if it is present
if (change > 0) {
msg.sender.transfer(change);
}
}
function () payable {
if (msg.value > 0) {
processContribution();
}
}
}
contract KickcityCrowdsale is KickcityAbstractCrowdsale {
function KickcityCrowdsale(uint256 start, uint256 end, KickcityToken _token, address beneficiary) KickcityAbstractCrowdsale(start, end, _token, beneficiary) { }
function calcKicks(uint256 etherVal) constant public returns (uint256 kicksVal) {
assert(etherVal >= minEtherContrib);
uint256 value = safeMul(etherVal, oneEtherInKicks);
if (now <= saleStartTime + 1 days) {
// 15% bonus in first day
kicksVal = safeAdd(value, safeMul(value / 100, 15));
} else if (now <= saleStartTime + 10 days) {
// 10% bonus in 2-10 day
kicksVal = safeAdd(value, value / 10);
} else if (now <= saleStartTime + 20 days) {
// 5% bonus in 11-20 day
kicksVal = safeAdd(value, value / 20);
} else {
kicksVal = value;
}
}
}
contract KickcityToken is SmartToken {
function KickcityToken() SmartToken("KickCity Token", "KCY", 18) {
disableTransfers(true);
}
}
{
"compilationTarget": {
"KickcityCrowdsale.sol": "KickcityCrowdsale"
},
"libraries": {},
"optimizer": {
"enabled": false,
"runs": 200
},
"remappings": []
}
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