Contract Source Code:
File 1 of 1 : PohcToken
pragma solidity 0.5.10;
// sol token
//
// Professor Rui-Shan Lu Team
// Lursun <[email protected]>
// reference https://ethereum.org/token
contract Ownable {
address public owner;
constructor() public {
owner = msg.sender;
}
modifier onlyOwner {
require(msg.sender == owner, "msg.sender != owner");
_;
}
function transferOwnership(address _newOwner) public onlyOwner {
owner = _newOwner;
}
}
contract Pausable is Ownable {
event Pause();
event Unpause();
bool public paused = false;
modifier whenNotPaused() {
assert(!paused);
_;
}
modifier whenPaused() {
assert(paused);
_;
}
function pause() public onlyOwner whenNotPaused {
paused = true;
emit Pause();
}
function unpause() public onlyOwner whenPaused{
paused = false;
emit Unpause();
}
}
contract TokenERC20 is Pausable {
// Public variables of the token
string public name;
string public symbol;
uint8 public decimals;
// 18 decimals is the strongly suggested default, avoid changing it
uint256 public totalSupply;
// This creates an array with all balances
mapping (address => uint256) public balanceOf;
mapping (address => mapping (address => uint256)) public allowance;
event Approval(address indexed _owner, address indexed _spender, uint256 _value);
// This generates a public event on the blockchain that will notify clients
event Transfer(address indexed _from, address indexed _to, uint256 _value);
/**
* Constrctor function
*
* Initializes contract with initial supply tokens to the creator of the contract
*/
constructor(string memory _name, string memory _symbol, uint8 _decimals, uint _totalSupply) public {
name = _name;
symbol = _symbol;
decimals = _decimals;
totalSupply = _totalSupply;
balanceOf[msg.sender] = _totalSupply;
}
/**
* Transfer tokens
*
* Send `_value` tokens to `_to` from your account
*
* @param _to The address of the recipient
* @param _value the amount to send
*/
function transfer(address _to, uint256 _value) public returns (bool success) {
return _transfer(msg.sender, _to, _value);
}
/**
* Transfer tokens from other address
*
* Send `_value` tokens to `_to` in behalf of `_from`
*
* @param _from The address of the sender
* @param _to The address of the recipient
* @param _value the amount to send
*/
function transferFrom(address _from, address _to, uint256 _value) public returns (bool success) {
// Check allowance
require(allowance[_from][msg.sender] >= _value, "allowance[_from][msg.sender] < _value");
allowance[_from][msg.sender] -= _value;
_transfer(_from, _to, _value);
return true;
}
/**
* Set allowance for other address
*
* Allows `_spender` to spend no more than `_value` tokens in your behalf
*
* @param _spender The address authorized to spend
* @param _value the max amount they can spend
*/
function approve(address _spender, uint256 _value) public whenNotPaused returns (bool success) {
allowance[msg.sender][_spender] = _value;
emit Approval(msg.sender, _spender, _value);
return true;
}
/**
* Internal transfer, only can be called by this contract
*/
function _transfer(address _from, address _to, uint _value) internal whenNotPaused returns (bool success) {
// Prevent transfer to 0x0 address. Use burn() instead
require(_to != address(0), "_to == address(0)");
// Check if the sender has enough
require(balanceOf[_from] >= _value, "balanceOf[_from] < _value");
// Check for overflows
require(balanceOf[_to] + _value >= balanceOf[_to], "balanceOf[_to] + _value < balanceOf[_to]");
// Save this for an assertion in the future
uint previousBalances = balanceOf[_from] + balanceOf[_to];
// Subtract from the sender
balanceOf[_from] -= _value;
// Add the same to the recipient
balanceOf[_to] += _value;
emit Transfer(_from, _to, _value);
// Asserts are used to use static analysis to find bugs in your code. They should never fail
assert(balanceOf[_from] + balanceOf[_to] == previousBalances);
return true;
}
}
/******************************************/
/* ADVANCED TOKEN STARTS HERE */
/******************************************/
contract MyAdvancedToken is TokenERC20 {
mapping (address => bool) public frozenAccount;
/* This generates a public event on the blockchain that will notify clients */
event FrozenFunds(address target, bool frozen);
/* Initializes contract with initial supply tokens to the creator of the contract */
constructor(string memory _name, string memory _symbol, uint8 _decimals, uint _totalSupply) TokenERC20(_name, _symbol, _decimals, _totalSupply) public {}
function () external payable {
assert(false);
}
/// @notice `_freeze? Prevent | Allow` `_target` from sending & receiving tokens
/// @param _target Address to be frozen
/// @param _freeze either to _freeze it or not
function freezeAccount(address _target, bool _freeze) public onlyOwner {
frozenAccount[_target] = _freeze;
emit FrozenFunds(_target, _freeze);
}
/* Internal transfer, only can be called by this contract */
function _transfer(address _from, address _to, uint _value) internal returns (bool success) {
// Check if sender is frozen
require(!frozenAccount[_from], "frozenAccount[_from]");
// Check if recipient is frozen
require(!frozenAccount[_to], "frozenAccount[_to]");
return super._transfer(_from, _to, _value);
}
}
contract PohcToken is MyAdvancedToken {
mapping(address => uint) public lockdate;
mapping(address => uint) public lockTokenBalance;
event LockToken(address account, uint amount, uint unixtime);
constructor(string memory _name, string memory _symbol, uint8 _decimals, uint _totalSupply) MyAdvancedToken(_name, _symbol, _decimals, _totalSupply) public {}
function lockTokenToDate(address _account, uint _amount, uint _unixtime) public onlyOwner {
require(_unixtime >= lockdate[_account], "_unixtime < lockdate[_account]");
require(_unixtime >= now, "_unixtime < now");
if(balanceOf[_account] >= _amount) {
lockdate[_account] = _unixtime;
lockTokenBalance[_account] = _amount;
emit LockToken(_account, _amount, _unixtime);
}
}
function lockTokenDays(address _account, uint _amount, uint _days) public {
uint unixtime = _days * 1 days + now;
lockTokenToDate(_account, _amount, unixtime);
}
function getLockBalance(address _account) internal returns(uint) {
if(now >= lockdate[_account]) {
lockdate[_account] = 0;
lockTokenBalance[_account] = 0;
}
return lockTokenBalance[_account];
}
/* Internal transfer, only can be called by this contract */
function _transfer(address _from, address _to, uint _value) internal returns (bool success) {
uint usableBalance = balanceOf[_from] - getLockBalance(_from);
require(balanceOf[_from] >= usableBalance, "balanceOf[_from] < usableBalance");
require(usableBalance >= _value, "usableBalance < _value");
return super._transfer(_from, _to, _value);
}
}