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 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;
}
}
/**
* @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();
}
}
/**
* @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);
}
contract DetailedERC20 is ERC20 {
string public name;
string public symbol;
uint8 public decimals;
function DetailedERC20(string _name, string _symbol, uint8 _decimals) public {
name = _name;
symbol = _symbol;
decimals = _decimals;
}
}
/**
* @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 Pausable token
* @dev StandardToken modified with pausable transfers.
**/
contract PausableToken is StandardToken, Pausable {
function transfer(address _to, uint256 _value) public whenNotPaused returns (bool) {
return super.transfer(_to, _value);
}
function transferFrom(address _from, address _to, uint256 _value) public whenNotPaused returns (bool) {
return super.transferFrom(_from, _to, _value);
}
function approve(address _spender, uint256 _value) public whenNotPaused returns (bool) {
return super.approve(_spender, _value);
}
function increaseApproval(address _spender, uint _addedValue) public whenNotPaused returns (bool success) {
return super.increaseApproval(_spender, _addedValue);
}
function decreaseApproval(address _spender, uint _subtractedValue) public whenNotPaused returns (bool success) {
return super.decreaseApproval(_spender, _subtractedValue);
}
}
/**
* @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 TokenVesting
* @dev A token holder contract that can release its token balance gradually like a
* typical vesting scheme, with a cliff and vesting period. Optionally revocable by the
* owner.
*/
contract TokenVesting is Ownable {
using SafeMath for uint256;
using SafeERC20 for ERC20Basic;
event Released(uint256 amount);
event Revoked();
// beneficiary of tokens after they are released
address public beneficiary;
uint256 public cliff;
uint256 public start;
uint256 public duration;
bool public revocable;
mapping (address => uint256) public released;
mapping (address => bool) public revoked;
/**
* @dev Creates a vesting contract that vests its balance of any ERC20 token to the
* _beneficiary, gradually in a linear fashion until _start + _duration. By then all
* of the balance will have vested.
* @param _beneficiary address of the beneficiary to whom vested tokens are transferred
* @param _cliff duration in seconds of the cliff in which tokens will begin to vest
* @param _duration duration in seconds of the period in which the tokens will vest
* @param _revocable whether the vesting is revocable or not
*/
function TokenVesting(address _beneficiary, uint256 _start, uint256 _cliff, uint256 _duration, bool _revocable) public {
require(_beneficiary != address(0));
require(_cliff <= _duration);
beneficiary = _beneficiary;
revocable = _revocable;
duration = _duration;
cliff = _start.add(_cliff);
start = _start;
}
/**
* @notice Transfers vested tokens to beneficiary.
* @param token ERC20 token which is being vested
*/
function release(ERC20Basic token) public {
uint256 unreleased = releasableAmount(token);
require(unreleased > 0);
released[token] = released[token].add(unreleased);
token.safeTransfer(beneficiary, unreleased);
Released(unreleased);
}
/**
* @notice Allows the owner to revoke the vesting. Tokens already vested
* remain in the contract, the rest are returned to the owner.
* @param token ERC20 token which is being vested
*/
function revoke(ERC20Basic token) public onlyOwner {
require(revocable);
require(!revoked[token]);
uint256 balance = token.balanceOf(this);
uint256 unreleased = releasableAmount(token);
uint256 refund = balance.sub(unreleased);
revoked[token] = true;
token.safeTransfer(owner, refund);
Revoked();
}
/**
* @dev Calculates the amount that has already vested but hasn't been released yet.
* @param token ERC20 token which is being vested
*/
function releasableAmount(ERC20Basic token) public view returns (uint256) {
return vestedAmount(token).sub(released[token]);
}
/**
* @dev Calculates the amount that has already vested.
* @param token ERC20 token which is being vested
*/
function vestedAmount(ERC20Basic token) public view returns (uint256) {
uint256 currentBalance = token.balanceOf(this);
uint256 totalBalance = currentBalance.add(released[token]);
if (now < cliff) {
return 0;
} else if (now >= start.add(duration) || revoked[token]) {
return totalBalance;
} else {
return totalBalance.mul(now.sub(start)).div(duration);
}
}
}
/**
* @title RateToken
* @dev Rate Token Contract implementation
*/
contract RateToken is Ownable {
using SafeMath for uint256;
//struct that holds values for specific discount
struct Discount {
//min number of tokens expected to be bought
uint256 minTokens;
//discount percentage
uint256 percent;
}
//Discount per address
mapping(address => Discount) private discounts;
//Token conversion rate
uint256 public rate;
/**
* @dev Event which is fired when Rate is set
*/
event RateSet(uint256 rate);
function RateToken(uint256 _initialRate) public {
setRate(_initialRate);
}
/**
* @dev Function that sets the conversion rate
* @param _rateInWei The amount of rate to be set
*/
function setRate(uint _rateInWei) onlyOwner public {
require(_rateInWei > 0);
rate = _rateInWei;
RateSet(rate);
}
/**
* @dev Function for adding discount for concrete buyer, only available for the owner.
* @param _buyer The address of the buyer.
* @param _minTokens The amount of tokens.
* @param _percent The amount of discount in percents.
* @return A boolean that indicates if the operation was successful.
*/
// NOTE FROM BLOCKERA - PERCENTAGE COULD BE UINT8 (0 - 255)
function addDiscount(address _buyer, uint256 _minTokens, uint256 _percent) public onlyOwner returns (bool) {
require(_buyer != address(0));
require(_minTokens > 0);
require(_percent > 0);
require(_percent < 100);
Discount memory discount;
discount.minTokens = _minTokens;
discount.percent = _percent;
discounts[_buyer] = discount;
return true;
}
/**
* @dev Function to remove discount.
* @param _buyer The address to remove the discount from.
* @return A boolean that indicates if the operation was successful.
*/
function removeDiscount(address _buyer) public onlyOwner {
require(_buyer != address(0));
removeExistingDiscount(_buyer);
}
/**
* @dev Public Function that calculates the amount in wei for specific number of tokens
* @param _buyer address.
* @param _tokens The amount of tokens.
* @return uint256 the price for tokens in wei.
*/
function calculateWeiNeeded(address _buyer, uint _tokens) public view returns (uint256) {
require(_buyer != address(0));
require(_tokens > 0);
Discount memory discount = discounts[_buyer];
require(_tokens >= discount.minTokens);
if (discount.minTokens == 0) {
return _tokens.div(rate);
}
uint256 costOfTokensNormally = _tokens.div(rate);
return costOfTokensNormally.mul(100 - discount.percent).div(100);
}
/**
* @dev Removes discount for concrete buyer.
* @param _buyer the address for which the discount will be removed.
*/
function removeExistingDiscount(address _buyer) internal {
delete(discounts[_buyer]);
}
/**
* @dev Function that converts wei into tokens.
* @param _buyer address of the buyer.
* @param _buyerAmountInWei amount of ether in wei.
* @return uint256 value of the calculated tokens.
*/
function calculateTokens(address _buyer, uint256 _buyerAmountInWei) internal view returns (uint256) {
Discount memory discount = discounts[_buyer];
if (discount.minTokens == 0) {
return _buyerAmountInWei.mul(rate);
}
uint256 normalTokens = _buyerAmountInWei.mul(rate);
uint256 discountBonus = normalTokens.mul(discount.percent).div(100);
uint256 tokens = normalTokens + discountBonus;
require(tokens >= discount.minTokens);
return tokens;
}
}
/**
* @title Caerus token.
* @dev Implementation of the Caerus token.
*/
contract CaerusToken is RateToken, PausableToken, DetailedERC20 {
mapping (address => uint256) public contributions;
uint256 public tokenSold = 0;
uint256 public weiRaised = 0;
address transferAddress;
mapping (address => TokenVesting) public vestedTokens;
event TokensBought(address indexed buyer, uint256 tokens);
event Contribution(address indexed buyer, uint256 amountInWei);
event VestedTokenCreated(address indexed beneficiary, uint256 duration, uint256 tokens);
event TokensSpent(address indexed tokensHolder, uint256 tokens);
function CaerusToken(address _transferAddress, uint _initialRate) public RateToken(_initialRate) DetailedERC20("Caerus Token", "CAER", 18) {
totalSupply_ = 73000000 * 10 ** 18;
transferAddress = _transferAddress;
balances[owner] = totalSupply_;
}
/**
* @dev Sets the address to transfer funds.
* @param _transferAddress An address to transfer funds.
*/
function setTransferAddress(address _transferAddress) onlyOwner public {
transferAddress = _transferAddress;
}
/**
* @dev Fallback function when receiving Ether.
*/
function() payable public {
buyTokens();
}
/**
* @dev Allow addresses to buy tokens.
*/
function buyTokens() payable public whenNotPaused {
require(msg.value > 0);
uint256 tokens = calculateTokens(msg.sender, msg.value);
transferTokens(owner, msg.sender, tokens);
markTokenSold(tokens);
markContribution();
removeExistingDiscount(msg.sender);
transferAddress.transfer(msg.value);
TokensBought(msg.sender, tokens);
}
/**
* @dev Transfer tokens from owner to specific address, available only for the owner.
* @param _to The address where tokens are transfered.
* @param _tokens Amount of tokens that need to be transfered.
* @return Boolean representing the successful execution of the function.
*/
// Owner could use regular transfer method if they wanted to
function markTransferTokens(address _to, uint256 _tokens) onlyOwner public returns (bool) {
require(_to != address(0));
transferTokens(owner, _to, _tokens);
markTokenSold(_tokens);
return true;
}
/**
* @dev Creates a vesting contract that vests its balance of any ERC20 token to the
* _beneficiary, gradually in a linear fashion until _start + _duration. By then all
* of the balance will have vested.
* @param _beneficiary address of the beneficiary to whom vested tokens are transferred.
* @param _start time when vesting starts.
* @param _cliff duration in seconds of the cliff in which tokens will begin to vest.
* @param _duration duration in seconds of the period in which the tokens will vest.
* @param _tokens Amount of tokens that need to be vested.
* @return Boolean representing the successful execution of the function.
*/
function createVestedToken(address _beneficiary, uint256 _start, uint256 _cliff, uint256 _duration, uint256 _tokens) onlyOwner public returns (bool) {
TokenVesting vestedToken = new TokenVesting(_beneficiary, _start, _cliff, _duration, false);
vestedTokens[_beneficiary] = vestedToken;
address vestedAddress = address(vestedToken);
transferTokens(owner, vestedAddress, _tokens);
VestedTokenCreated(_beneficiary, _duration, _tokens);
return true;
}
/**
* @dev Transfer tokens from address to owner address.
* @param _tokens Amount of tokens that need to be transfered.
* @return Boolean representing the successful execution of the function.
*/
function spendToken(uint256 _tokens) public returns (bool) {
transferTokens(msg.sender, owner, _tokens);
TokensSpent(msg.sender, _tokens);
return true;
}
/**
* @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.
* @param _spender The address which will spend the funds.
* @param _value The amount of tokens to be spent.
* @return Boolean representing the successful execution of the function.
*/
function approve(address _spender, uint _value) public returns (bool) {
// To change the approve amount you first have to reduce the addresses`
// allowance to zero by calling `approve(_spender, 0)` if it is not
// already 0 to mitigate the race condition described here:
// https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
require(_value == 0 || allowed[msg.sender][_spender] == 0);
return super.approve(_spender, _value);
}
/**
* @dev Transfer tokens from one address to another.
* @param _from The address which you want to send tokens from.
* @param _to The address which you want to transfer to.
* @param _tokens the amount of tokens to be transferred.
*/
function transferTokens(address _from, address _to, uint256 _tokens) private {
require(_tokens > 0);
require(balances[_from] >= _tokens);
balances[_from] = balances[_from].sub(_tokens);
balances[_to] = balances[_to].add(_tokens);
Transfer(_from, _to, _tokens);
}
/**
* @dev Adds or updates contributions
*/
function markContribution() private {
contributions[msg.sender] = contributions[msg.sender].add(msg.value);
weiRaised = weiRaised.add(msg.value);
Contribution(msg.sender, msg.value);
}
/**
* @dev Increase token sold amount.
* @param _tokens Amount of tokens that are sold.
*/
function markTokenSold(uint256 _tokens) private {
tokenSold = tokenSold.add(_tokens);
}
/**
* @dev Owner can transfer out any accidentally sent Caerus tokens.
* @param _tokenAddress The address which you want to send tokens from.
* @param _tokens the amount of tokens to be transferred.
*/
function transferAnyCaerusToken(address _tokenAddress, uint _tokens) public onlyOwner returns (bool success) {
transferTokens(_tokenAddress, owner, _tokens);
return true;
}
}
{
"compilationTarget": {
"CaerusToken.sol": "CaerusToken"
},
"libraries": {},
"optimizer": {
"enabled": false,
"runs": 200
},
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