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pragma solidity 0.4.26;
/**
* @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 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 SafeMath
* @dev Math operations with safety checks that throw an error.
* Based off of https://github.com/OpenZeppelin/openzeppelin-solidity/blob/master/contracts/math/SafeMath.sol.
*/
library SafeMath {
/*
* Internal functions
*/
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)
{
uint256 c = a / b;
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;
}
}
/**
* @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 {
using SafeMath for uint256;
address private owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
event MintFinished();
bool public mintingFinished = false;
mapping(address => uint256) balances;
modifier onlyOwner() {
require(msg.sender == owner);
_;
}
/**
* @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) onlyOwner 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);
emit 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];
}
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) onlyOwner 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);
emit 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) onlyOwner public returns (bool) {
allowed[msg.sender][_spender] = _value;
emit 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) onlyOwner 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) onlyOwner public returns (bool) {
allowed[msg.sender][_spender] = allowed[msg.sender][_spender].add(_addedValue);
emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
return true;
}
function decreaseApproval (address _spender, uint _subtractedValue) onlyOwner 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);
}
emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
return true;
}
/**
* @dev Function to transfer token ownership.
*/
function transferOwnership(address newOwner) public onlyOwner {
require(newOwner != address(0));
emit OwnershipTransferred(owner, newOwner);
owner = newOwner;
}
modifier canMint() {
require(!mintingFinished);
_;
}
/**
* @dev Function to stop minting new guild member tokens.
* @return True if the operation was successful.
*/
function finishMinting() onlyOwner canMint public returns (bool) {
mintingFinished = true;
emit MintFinished();
return true;
}
}
/**
* @title Mintable Tribute Token
* @dev Simple ERC20 Token example, with mintable token creation and amendable tribute system
* @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 MintableTributeToken is StandardToken {
event Mint(address indexed to, uint256 amount);
event MintFinished();
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
string public symbol;
string public name;
uint8 public decimals;
uint public totalSupply;
address public owner;
uint public tribute;
address public guild;
uint8 private amount;
bool public mintingFinished = false;
constructor(string memory _symbol, string memory _name, uint _totalSupply, address _owner, uint _tribute, address _guild) public {
symbol = _symbol;
name = _name;
decimals = 0;
totalSupply = _totalSupply;
owner = _owner;
tribute = _tribute;
guild = _guild;
balances[_owner] = _totalSupply;
emit Transfer(address(0), _owner, _totalSupply);
}
modifier canMint() {
require(!mintingFinished);
_;
}
modifier onlyOwner() {
require(msg.sender == owner);
_;
}
/**
* @dev Function to update tribute amount for guild token mint.
*/
function updateTribute(uint _tribute) onlyOwner public {
tribute = _tribute;
}
/**
* @dev Function to update guild address for tribute transfer.
*/
function updateGuild(address _guild) onlyOwner public {
guild = _guild;
}
/**
* @dev Function to mint new guild tokens after tribute attached.
* @return A boolean that indicates if the operation was successful.
*/
function mint() canMint payable public returns (bool) {
require(address(this).balance == tribute, "tribute must be funded");
address(guild).transfer(address(this).balance);
amount = 1;
totalSupply = totalSupply.add(amount);
balances[msg.sender] = balances[msg.sender].add(amount);
emit Mint(msg.sender, amount);
emit Transfer(address(0), msg.sender, amount);
return true;
}
/**
* @dev Function to stop minting new guild member tokens.
* @return True if the operation was successful.
*/
function finishMinting() onlyOwner canMint public returns (bool) {
mintingFinished = true;
emit MintFinished();
return true;
}
/**
* @dev Function to transfer token ownership.
*/
function transferOwnership(address newOwner) public onlyOwner {
require(newOwner != address(0));
emit OwnershipTransferred(owner, newOwner);
owner = newOwner;
}
}
contract Factory {
/*
* Events
*/
event ContractInstantiation(address sender, address instantiation);
/*
* Storage
*/
mapping(address => bool) public isInstantiation;
mapping(address => address[]) public instantiations;
/*
* Public functions
*/
/// @dev Returns number of instantiations by creator.
/// @param creator Contract creator.
/// @return Returns number of instantiations by creator.
function getInstantiationCount(address creator)
public
view
returns (uint)
{
return instantiations[creator].length;
}
/*
* Internal functions
*/
/// @dev Registers contract in factory registry.
/// @param instantiation Address of contract instantiation.
function register(address instantiation)
internal
{
isInstantiation[instantiation] = true;
instantiations[msg.sender].push(instantiation);
emit ContractInstantiation(msg.sender, instantiation);
}
}
/// @title TokenMint - Allows creation of custom mintable tribute tokens.
contract TributeTokenMintNT is Factory {
/*
* Public functions
*/
/// @dev Allows verified creation of custom ERC20 token with amendable tribute system.
/// @param _symbol String for token symbol.
/// @param _name String for toke name.
/// @param _totalSupply Uint for initial token supply.
/// @param _owner Address for token owner.
/// @param _tribute Uint amendable tribute amount.
/// @param _guild Address amendable guild address for tribute transfer.
/// @return Returns token address.
function create(string memory _symbol, string memory _name, uint _totalSupply, address _owner, uint _tribute, address _guild)
public
returns (address tokenAddress)
{
tokenAddress = new MintableTributeToken(_symbol, _name, _totalSupply, _owner, _tribute, _guild);
register(tokenAddress);
}
}
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