Contract Source Code:
File 1 of 1 : TrueUSD
pragma solidity ^0.4.18;
contract DelegateERC20 {
function delegateTotalSupply() public view returns (uint256);
function delegateBalanceOf(address who) public view returns (uint256);
function delegateTransfer(address to, uint256 value, address origSender) public returns (bool);
function delegateAllowance(address owner, address spender) public view returns (uint256);
function delegateTransferFrom(address from, address to, uint256 value, address origSender) public returns (bool);
function delegateApprove(address spender, uint256 value, address origSender) public returns (bool);
function delegateIncreaseApproval(address spender, uint addedValue, address origSender) public returns (bool);
function delegateDecreaseApproval(address spender, uint subtractedValue, address origSender) public returns (bool);
}
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;
}
}
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;
}
}
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();
}
}
contract CanReclaimToken is Ownable {
using SafeERC20 for ERC20Basic;
/**
* @dev Reclaim all ERC20Basic compatible tokens
* @param token ERC20Basic The address of the token contract
*/
function reclaimToken(ERC20Basic token) external onlyOwner {
uint256 balance = token.balanceOf(this);
token.safeTransfer(owner, balance);
}
}
contract Claimable is Ownable {
address public pendingOwner;
/**
* @dev Modifier throws if called by any account other than the pendingOwner.
*/
modifier onlyPendingOwner() {
require(msg.sender == pendingOwner);
_;
}
/**
* @dev Allows the current owner to set the pendingOwner address.
* @param newOwner The address to transfer ownership to.
*/
function transferOwnership(address newOwner) onlyOwner public {
pendingOwner = newOwner;
}
/**
* @dev Allows the pendingOwner address to finalize the transfer.
*/
function claimOwnership() onlyPendingOwner public {
OwnershipTransferred(owner, pendingOwner);
owner = pendingOwner;
pendingOwner = address(0);
}
}
contract AddressList is Claimable {
string public name;
mapping (address => bool) public onList;
function AddressList(string _name, bool nullValue) public {
name = _name;
onList[0x0] = nullValue;
}
event ChangeWhiteList(address indexed to, bool onList);
// Set whether _to is on the list or not. Whether 0x0 is on the list
// or not cannot be set here - it is set once and for all by the constructor.
function changeList(address _to, bool _onList) onlyOwner public {
require(_to != 0x0);
if (onList[_to] != _onList) {
onList[_to] = _onList;
ChangeWhiteList(_to, _onList);
}
}
}
contract HasNoContracts is Ownable {
/**
* @dev Reclaim ownership of Ownable contracts
* @param contractAddr The address of the Ownable to be reclaimed.
*/
function reclaimContract(address contractAddr) external onlyOwner {
Ownable contractInst = Ownable(contractAddr);
contractInst.transferOwnership(owner);
}
}
contract HasNoEther is Ownable {
/**
* @dev Constructor that rejects incoming Ether
* @dev The `payable` flag is added so we can access `msg.value` without compiler warning. If we
* leave out payable, then Solidity will allow inheriting contracts to implement a payable
* constructor. By doing it this way we prevent a payable constructor from working. Alternatively
* we could use assembly to access msg.value.
*/
function HasNoEther() public payable {
require(msg.value == 0);
}
/**
* @dev Disallows direct send by settings a default function without the `payable` flag.
*/
function() external {
}
/**
* @dev Transfer all Ether held by the contract to the owner.
*/
function reclaimEther() external onlyOwner {
assert(owner.send(this.balance));
}
}
contract HasNoTokens is CanReclaimToken {
/**
* @dev Reject all ERC223 compatible tokens
* @param from_ address The address that is transferring the tokens
* @param value_ uint256 the amount of the specified token
* @param data_ Bytes The data passed from the caller.
*/
function tokenFallback(address from_, uint256 value_, bytes data_) external {
from_;
value_;
data_;
revert();
}
}
contract NoOwner is HasNoEther, HasNoTokens, HasNoContracts {
}
contract AllowanceSheet is Claimable {
using SafeMath for uint256;
mapping (address => mapping (address => uint256)) public allowanceOf;
function addAllowance(address tokenHolder, address spender, uint256 value) public onlyOwner {
allowanceOf[tokenHolder][spender] = allowanceOf[tokenHolder][spender].add(value);
}
function subAllowance(address tokenHolder, address spender, uint256 value) public onlyOwner {
allowanceOf[tokenHolder][spender] = allowanceOf[tokenHolder][spender].sub(value);
}
function setAllowance(address tokenHolder, address spender, uint256 value) public onlyOwner {
allowanceOf[tokenHolder][spender] = value;
}
}
contract BalanceSheet is Claimable {
using SafeMath for uint256;
mapping (address => uint256) public balanceOf;
function addBalance(address addr, uint256 value) public onlyOwner {
balanceOf[addr] = balanceOf[addr].add(value);
}
function subBalance(address addr, uint256 value) public onlyOwner {
balanceOf[addr] = balanceOf[addr].sub(value);
}
function setBalance(address addr, uint256 value) public onlyOwner {
balanceOf[addr] = value;
}
}
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);
}
contract BasicToken is ERC20Basic, Claimable {
using SafeMath for uint256;
BalanceSheet public balances;
uint256 totalSupply_;
function setBalanceSheet(address sheet) external onlyOwner {
balances = BalanceSheet(sheet);
balances.claimOwnership();
}
/**
* @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) {
transferAllArgsNoAllowance(msg.sender, _to, _value);
return true;
}
function transferAllArgsNoAllowance(address _from, address _to, uint256 _value) internal {
require(_to != address(0));
require(_from != address(0));
require(_value <= balances.balanceOf(_from));
// SafeMath.sub will throw if there is not enough balance.
balances.subBalance(_from, _value);
balances.addBalance(_to, _value);
Transfer(_from, _to, _value);
}
/**
* @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.balanceOf(_owner);
}
}
contract BurnableToken is BasicToken {
event Burn(address indexed burner, uint256 value);
/**
* @dev Burns a specific amount of tokens.
* @param _value The amount of token to be burned.
*/
function burn(uint256 _value) public {
require(_value <= balances.balanceOf(msg.sender));
// no need to require value <= totalSupply, since that would imply the
// sender's balance is greater than the totalSupply, which *should* be an assertion failure
address burner = msg.sender;
balances.subBalance(burner, _value);
totalSupply_ = totalSupply_.sub(_value);
Burn(burner, _value);
Transfer(burner, address(0), _value);
}
}
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);
}
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));
}
}
contract StandardToken is ERC20, BasicToken {
AllowanceSheet public allowances;
function setAllowanceSheet(address sheet) external onlyOwner {
allowances = AllowanceSheet(sheet);
allowances.claimOwnership();
}
/**
* @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) {
transferAllArgsYesAllowance(_from, _to, _value, msg.sender);
return true;
}
function transferAllArgsYesAllowance(address _from, address _to, uint256 _value, address spender) internal {
require(_value <= allowances.allowanceOf(_from, spender));
allowances.subAllowance(_from, spender, _value);
transferAllArgsNoAllowance(_from, _to, _value);
}
/**
* @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) {
approveAllArgs(_spender, _value, msg.sender);
return true;
}
function approveAllArgs(address _spender, uint256 _value, address _tokenHolder) internal {
allowances.setAllowance(_tokenHolder, _spender, _value);
Approval(_tokenHolder, _spender, _value);
}
/**
* @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 allowances.allowanceOf(_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) {
increaseApprovalAllArgs(_spender, _addedValue, msg.sender);
return true;
}
function increaseApprovalAllArgs(address _spender, uint _addedValue, address tokenHolder) internal {
allowances.addAllowance(tokenHolder, _spender, _addedValue);
Approval(tokenHolder, _spender, allowances.allowanceOf(tokenHolder, _spender));
}
/**
* @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) {
decreaseApprovalAllArgs(_spender, _subtractedValue, msg.sender);
return true;
}
function decreaseApprovalAllArgs(address _spender, uint _subtractedValue, address tokenHolder) internal {
uint oldValue = allowances.allowanceOf(tokenHolder, _spender);
if (_subtractedValue > oldValue) {
allowances.setAllowance(tokenHolder, _spender, 0);
} else {
allowances.subAllowance(tokenHolder, _spender, _subtractedValue);
}
Approval(tokenHolder, _spender, allowances.allowanceOf(tokenHolder, _spender));
}
}
contract CanDelegate is StandardToken {
// If this contract needs to be upgraded, the new contract will be stored
// in 'delegate' and any ERC20 calls to this contract will be delegated to that one.
DelegateERC20 public delegate;
event DelegatedTo(address indexed newContract);
// Can undelegate by passing in newContract = address(0)
function delegateToNewContract(DelegateERC20 newContract) public onlyOwner {
delegate = newContract;
DelegatedTo(delegate);
}
// If a delegate has been designated, all ERC20 calls are forwarded to it
function transfer(address to, uint256 value) public returns (bool) {
if (delegate == address(0)) {
return super.transfer(to, value);
} else {
return delegate.delegateTransfer(to, value, msg.sender);
}
}
function transferFrom(address from, address to, uint256 value) public returns (bool) {
if (delegate == address(0)) {
return super.transferFrom(from, to, value);
} else {
return delegate.delegateTransferFrom(from, to, value, msg.sender);
}
}
function balanceOf(address who) public view returns (uint256) {
if (delegate == address(0)) {
return super.balanceOf(who);
} else {
return delegate.delegateBalanceOf(who);
}
}
function approve(address spender, uint256 value) public returns (bool) {
if (delegate == address(0)) {
return super.approve(spender, value);
} else {
return delegate.delegateApprove(spender, value, msg.sender);
}
}
function allowance(address _owner, address spender) public view returns (uint256) {
if (delegate == address(0)) {
return super.allowance(_owner, spender);
} else {
return delegate.delegateAllowance(_owner, spender);
}
}
function totalSupply() public view returns (uint256) {
if (delegate == address(0)) {
return super.totalSupply();
} else {
return delegate.delegateTotalSupply();
}
}
function increaseApproval(address spender, uint addedValue) public returns (bool) {
if (delegate == address(0)) {
return super.increaseApproval(spender, addedValue);
} else {
return delegate.delegateIncreaseApproval(spender, addedValue, msg.sender);
}
}
function decreaseApproval(address spender, uint subtractedValue) public returns (bool) {
if (delegate == address(0)) {
return super.decreaseApproval(spender, subtractedValue);
} else {
return delegate.delegateDecreaseApproval(spender, subtractedValue, msg.sender);
}
}
}
contract StandardDelegate is StandardToken, DelegateERC20 {
address public delegatedFrom;
modifier onlySender(address source) {
require(msg.sender == source);
_;
}
function setDelegatedFrom(address addr) onlyOwner public {
delegatedFrom = addr;
}
// All delegate ERC20 functions are forwarded to corresponding normal functions
function delegateTotalSupply() public view returns (uint256) {
return totalSupply();
}
function delegateBalanceOf(address who) public view returns (uint256) {
return balanceOf(who);
}
function delegateTransfer(address to, uint256 value, address origSender) onlySender(delegatedFrom) public returns (bool) {
transferAllArgsNoAllowance(origSender, to, value);
return true;
}
function delegateAllowance(address owner, address spender) public view returns (uint256) {
return allowance(owner, spender);
}
function delegateTransferFrom(address from, address to, uint256 value, address origSender) onlySender(delegatedFrom) public returns (bool) {
transferAllArgsYesAllowance(from, to, value, origSender);
return true;
}
function delegateApprove(address spender, uint256 value, address origSender) onlySender(delegatedFrom) public returns (bool) {
approveAllArgs(spender, value, origSender);
return true;
}
function delegateIncreaseApproval(address spender, uint addedValue, address origSender) onlySender(delegatedFrom) public returns (bool) {
increaseApprovalAllArgs(spender, addedValue, origSender);
return true;
}
function delegateDecreaseApproval(address spender, uint subtractedValue, address origSender) onlySender(delegatedFrom) public returns (bool) {
decreaseApprovalAllArgs(spender, subtractedValue, origSender);
return true;
}
}
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);
}
}
contract TrueUSD is StandardDelegate, PausableToken, BurnableToken, NoOwner, CanDelegate {
string public name = "TrueUSD";
string public symbol = "TUSD";
uint8 public constant decimals = 18;
AddressList public canReceiveMintWhiteList;
AddressList public canBurnWhiteList;
AddressList public blackList;
AddressList public noFeesList;
uint256 public burnMin = 10000 * 10**uint256(decimals);
uint256 public burnMax = 20000000 * 10**uint256(decimals);
uint80 public transferFeeNumerator = 7;
uint80 public transferFeeDenominator = 10000;
uint80 public mintFeeNumerator = 0;
uint80 public mintFeeDenominator = 10000;
uint256 public mintFeeFlat = 0;
uint80 public burnFeeNumerator = 0;
uint80 public burnFeeDenominator = 10000;
uint256 public burnFeeFlat = 0;
address public staker;
event ChangeBurnBoundsEvent(uint256 newMin, uint256 newMax);
event Mint(address indexed to, uint256 amount);
event WipedAccount(address indexed account, uint256 balance);
function TrueUSD() public {
totalSupply_ = 0;
staker = msg.sender;
}
function setLists(AddressList _canReceiveMintWhiteList, AddressList _canBurnWhiteList, AddressList _blackList, AddressList _noFeesList) onlyOwner public {
canReceiveMintWhiteList = _canReceiveMintWhiteList;
canBurnWhiteList = _canBurnWhiteList;
blackList = _blackList;
noFeesList = _noFeesList;
}
function changeName(string _name, string _symbol) onlyOwner public {
name = _name;
symbol = _symbol;
}
//Burning functions as withdrawing money from the system. The platform will keep track of who burns coins,
//and will send them back the equivalent amount of money (rounded down to the nearest cent).
function burn(uint256 _value) public {
require(canBurnWhiteList.onList(msg.sender));
require(_value >= burnMin);
require(_value <= burnMax);
uint256 fee = payStakingFee(msg.sender, _value, burnFeeNumerator, burnFeeDenominator, burnFeeFlat, 0x0);
uint256 remaining = _value.sub(fee);
super.burn(remaining);
}
//Create _amount new tokens and transfer them to _to.
//Based on code by OpenZeppelin: https://github.com/OpenZeppelin/zeppelin-solidity/blob/master/contracts/token/MintableToken.sol
function mint(address _to, uint256 _amount) onlyOwner public {
require(canReceiveMintWhiteList.onList(_to));
totalSupply_ = totalSupply_.add(_amount);
balances.addBalance(_to, _amount);
Mint(_to, _amount);
Transfer(address(0), _to, _amount);
payStakingFee(_to, _amount, mintFeeNumerator, mintFeeDenominator, mintFeeFlat, 0x0);
}
//Change the minimum and maximum amount that can be burned at once. Burning
//may be disabled by setting both to 0 (this will not be done under normal
//operation, but we can't add checks to disallow it without losing a lot of
//flexibility since burning could also be as good as disabled
//by setting the minimum extremely high, and we don't want to lock
//in any particular cap for the minimum)
function changeBurnBounds(uint newMin, uint newMax) onlyOwner public {
require(newMin <= newMax);
burnMin = newMin;
burnMax = newMax;
ChangeBurnBoundsEvent(newMin, newMax);
}
// transfer and transferFrom are both dispatched to this function, so we
// check blacklist and pay staking fee here.
function transferAllArgsNoAllowance(address _from, address _to, uint256 _value) internal {
require(!blackList.onList(_from));
require(!blackList.onList(_to));
super.transferAllArgsNoAllowance(_from, _to, _value);
payStakingFee(_to, _value, transferFeeNumerator, transferFeeDenominator, 0, _from);
}
function wipeBlacklistedAccount(address account) public onlyOwner {
require(blackList.onList(account));
uint256 oldValue = balanceOf(account);
balances.setBalance(account, 0);
totalSupply_ = totalSupply_.sub(oldValue);
WipedAccount(account, oldValue);
}
function payStakingFee(address payer, uint256 value, uint80 numerator, uint80 denominator, uint256 flatRate, address otherParticipant) private returns (uint256) {
if (noFeesList.onList(payer) || noFeesList.onList(otherParticipant)) {
return 0;
}
uint256 stakingFee = value.mul(numerator).div(denominator).add(flatRate);
if (stakingFee > 0) {
super.transferAllArgsNoAllowance(payer, staker, stakingFee);
}
return stakingFee;
}
function changeStakingFees(uint80 _transferFeeNumerator,
uint80 _transferFeeDenominator,
uint80 _mintFeeNumerator,
uint80 _mintFeeDenominator,
uint256 _mintFeeFlat,
uint80 _burnFeeNumerator,
uint80 _burnFeeDenominator,
uint256 _burnFeeFlat) public onlyOwner {
require(_transferFeeDenominator != 0);
require(_mintFeeDenominator != 0);
require(_burnFeeDenominator != 0);
transferFeeNumerator = _transferFeeNumerator;
transferFeeDenominator = _transferFeeDenominator;
mintFeeNumerator = _mintFeeNumerator;
mintFeeDenominator = _mintFeeDenominator;
mintFeeFlat = _mintFeeFlat;
burnFeeNumerator = _burnFeeNumerator;
burnFeeDenominator = _burnFeeDenominator;
burnFeeFlat = _burnFeeFlat;
}
function changeStaker(address newStaker) public onlyOwner {
require(newStaker != address(0));
staker = newStaker;
}
}