Contract Source Code:
File 1 of 1 : storeum
pragma solidity 0.4.25;
// ----------------------------------------------------------------------------------------------
// sto token by storeum Limited.
// An ERC20 standard
//
// author: storeum team
// Contact: [email protected]
contract ERC20 {
uint256 public totalSupply;
function balanceOf(address who) public view returns (uint256 _user);
function transfer(address to, uint256 value) public returns (bool success);
function allowance(address owner, address spender) public view returns (uint256 value);
function transferFrom(address from, address to, uint256 value) public returns (bool success);
function approve(address spender, uint256 value) public returns (bool success);
event Transfer(address indexed from, address indexed to, uint256 value);
event Approval(address indexed owner, address indexed spender, uint256 value);
}
library SafeMath {
function safeMul(uint256 a, uint256 b) internal pure returns (uint256) {
if (a == 0) {
return 0;
}
uint256 c = a * b;
assert(c / a == b);
return c;
}
function safeSub(uint256 a, uint256 b) internal pure returns (uint256) {
assert(b <= a);
return a - b;
}
function safeAdd(uint256 a, uint256 b) internal pure returns (uint256) {
uint c = a + b;
assert(c>=a);
return c;
}
function safeDiv(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;
}
}
contract OnlyOwner {
address public owner;
address private controller;
//log the previous and new controller when event is fired.
event SetNewController(address prev_controller, address new_controller);
/**
* @dev The Ownable constructor sets the original `owner` of the contract to the sender
* account.
*/
constructor() public {
owner = msg.sender;
controller = owner;
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier isOwner {
require(msg.sender == owner);
_;
}
/**
* @dev Throws if called by any account other than the controller.
*/
modifier isController {
require(msg.sender == controller);
_;
}
function replaceController(address new_controller) isController public returns(bool){
require(new_controller != address(0x0));
controller = new_controller;
emit SetNewController(msg.sender,controller);
return true;
}
}
contract StandardToken is ERC20{
using SafeMath for uint256;
mapping(address => uint256) balances;
mapping (address => mapping (address => uint256)) allowed;
function _transfer(address _from, address _to, uint256 _value) internal returns (bool success){
//prevent sending of tokens from genesis address or to self
require(_from != address(0) && _from != _to);
require(_to != address(0));
//subtract tokens from the sender on transfer
balances[_from] = balances[_from].safeSub(_value);
//add tokens to the receiver on reception
balances[_to] = balances[_to].safeAdd(_value);
return true;
}
function transfer(address _to, uint256 _value) public returns (bool success)
{
require(_value <= balances[msg.sender]);
_transfer(msg.sender,_to,_value);
emit Transfer(msg.sender, _to, _value);
return true;
}
function transferFrom(address _from, address _to, uint256 _value) public returns (bool) {
uint256 _allowance = allowed[_from][msg.sender];
//value must be less than allowed value
require(_value <= _allowance);
//balance of sender + token value transferred by sender must be greater than balance of sender
require(balances[_to] + _value > balances[_to]);
//call transfer function
_transfer(_from,_to,_value);
//subtract the amount allowed to the sender
allowed[_from][msg.sender] = _allowance.safeSub(_value);
//trigger Transfer event
emit Transfer(_from, _to, _value);
return true;
}
function balanceOf(address _owner) public constant returns (uint balance) {
return balances[_owner];
}
/**
* @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) {
// 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));
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) public view returns (uint256) {
return allowed[_owner][_spender];
}
}
contract storeum is StandardToken, OnlyOwner{
uint256 public constant decimals = 18;
string public constant name = "storeum";
string public constant symbol = "STO";
string public constant version = "1.0";
uint256 public constant totalSupply =279000000*10**18;
uint256 private approvalCounts =0;
uint256 private minRequiredApprovals =2;
address public burnedTokensReceiver;
constructor() public{
balances[msg.sender] = totalSupply;
burnedTokensReceiver = 0x0000000000000000000000000000000000000000;
}
/**
* @dev Function to set approval count variable value.
* @param _value uint The value by which approvalCounts variable will be set.
*/
function setApprovalCounts(uint _value) public isController {
approvalCounts = _value;
}
/**
* @dev Function to set minimum require approval variable value.
* @param _value uint The value by which minRequiredApprovals variable will be set.
* @return true.
*/
function setMinApprovalCounts(uint _value) public isController returns (bool){
require(_value > 0);
minRequiredApprovals = _value;
return true;
}
/**
* @dev Function to get approvalCounts variable value.
* @return approvalCounts.
*/
function getApprovalCount() public view isController returns(uint){
return approvalCounts;
}
/**
* @dev Function to get burned Tokens Receiver address.
* @return burnedTokensReceiver.
*/
function getBurnedTokensReceiver() public view isController returns(address){
return burnedTokensReceiver;
}
function controllerApproval(address _from, uint256 _value) public isOwner returns (bool) {
require(minRequiredApprovals <= approvalCounts);
require(_value <= balances[_from]);
balances[_from] = balances[_from].safeSub(_value);
balances[burnedTokensReceiver] = balances[burnedTokensReceiver].safeAdd(_value);
emit Transfer(_from,burnedTokensReceiver, _value);
return true;
}
}