Contract Source Code:
File 1 of 1 : PandoToken
/**
* PANDO token
*
*/
// SPDX-License-Identifier: MIT
pragma solidity ^0.5.9;
library SafeMath
{
function mul(uint256 a, uint256 b) internal pure returns (uint256)
{
uint256 c = a * b;
assert(a == 0 || 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;
}
}
contract OwnerHelper
{
address public owner;
event ChangeOwner(address indexed _from, address indexed _to);
modifier onlyOwner
{
require(msg.sender == owner);
_;
}
constructor() public
{
owner = msg.sender;
}
function transferOwnership(address _to) onlyOwner public
{
require(_to != owner);
require(_to != address(0x0));
address from = owner;
owner = _to;
emit ChangeOwner(from, _to);
}
}
contract ERC20Interface
{
event Transfer( address indexed _from, address indexed _to, uint _value);
event Approval( address indexed _owner, address indexed _spender, uint _value);
function totalSupply() view public returns (uint _supply);
function balanceOf( address _who ) public view returns (uint _value);
function transfer( address _to, uint _value) public returns (bool _success);
function approve( address _spender, uint _value ) public returns (bool _success);
function allowance( address _owner, address _spender ) public view returns (uint _allowance);
function transferFrom( address _from, address _to, uint _value) public returns (bool _success);
}
contract PandoToken is ERC20Interface, OwnerHelper
{
using SafeMath for uint;
string public name;
uint public decimals;
string public symbol;
// Founder
address private founder;
// Total
uint public totalTokenSupply;
uint public burnTokenSupply;
mapping (address => uint) public balances;
mapping (address => mapping ( address => uint )) public approvals;
mapping (address => bool) private blackAddress; // unLock : false, Lock : true
bool public tokenLock = false;
// Token Total
uint constant private E18 = 1000000000000000000;
event Burn(address indexed _from, uint _tokens);
event TokenUnlock(address indexed _to, uint _tokens);
constructor(string memory _name, string memory _symbol, address _founder, uint _totalTokenSupply) public {
name = _name;
decimals = 18;
symbol = _symbol;
founder = _founder;
totalTokenSupply = _totalTokenSupply * E18;
burnTokenSupply = 0;
balances[founder] = totalTokenSupply;
emit Transfer(address(0), founder, totalTokenSupply);
}
// ERC - 20 Interface -----
modifier notLocked {
require(isTransferable() == true);
_;
}
function lock(address who) onlyOwner public {
blackAddress[who] = true;
}
function unlock(address who) onlyOwner public {
blackAddress[who] = false;
}
function isLocked(address who) public view returns(bool) {
return blackAddress[who];
}
function totalSupply() view public returns (uint)
{
return totalTokenSupply;
}
function balanceOf(address _who) view public returns (uint)
{
return balances[_who];
}
function transfer(address _to, uint _value) notLocked public returns (bool)
{
require(balances[msg.sender] >= _value);
balances[msg.sender] = balances[msg.sender].sub(_value);
balances[_to] = balances[_to].add(_value);
emit Transfer(msg.sender, _to, _value);
return true;
}
function approve(address _spender, uint _value) notLocked public returns (bool)
{
require(balances[msg.sender] >= _value);
approvals[msg.sender][_spender] = _value;
emit Approval(msg.sender, _spender, _value);
return true;
}
function allowance(address _owner, address _spender) view public returns (uint)
{
return approvals[_owner][_spender];
}
function transferFrom(address _from, address _to, uint _value) notLocked public returns (bool)
{
require(balances[_from] >= _value);
require(approvals[_from][msg.sender] >= _value);
approvals[_from][msg.sender] = approvals[_from][msg.sender].sub(_value);
balances[_from] = balances[_from].sub(_value);
balances[_to] = balances[_to].add(_value);
emit Transfer(_from, _to, _value);
return true;
}
// Lock Function -----
function isTransferable() private view returns (bool)
{
if(tokenLock == false) {
if (blackAddress[msg.sender]) // true is Locked
{
return false;
} else {
return true;
}
}
else if(msg.sender == owner)
{
return true;
}
return false;
}
function setTokenUnlock() onlyOwner public
{
require(tokenLock == true);
tokenLock = false;
}
function setTokenLock() onlyOwner public
{
require(tokenLock == false);
tokenLock = true;
}
function withdrawTokens(address _contract, uint _value) onlyOwner public
{
if(_contract == address(0x0))
{
uint eth = _value.mul(10 ** decimals);
msg.sender.transfer(eth);
}
else
{
uint tokens = _value.mul(10 ** decimals);
ERC20Interface(_contract).transfer(msg.sender, tokens);
emit Transfer(address(0x0), msg.sender, tokens);
}
}
function burnToken(uint _value) onlyOwner public
{
uint tokens = _value.mul(10 ** decimals);
require(balances[msg.sender] >= tokens);
balances[msg.sender] = balances[msg.sender].sub(tokens);
burnTokenSupply = burnTokenSupply.add(tokens);
totalTokenSupply = totalTokenSupply.sub(tokens);
emit Burn(msg.sender, tokens);
}
function close() onlyOwner public
{
selfdestruct(msg.sender);
}
}