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ERC20Token.sol
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ERC20Token.sol
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// SPDX-License-Identifier: MIT
/*
█▀▄▀█ █▀▀ ▀█▀ ▄▀█ █▄▀ █ █▄░█ █▀▀ █▀
█░▀░█ ██▄ ░█░ █▀█ █░█ █ █░▀█ █▄█ ▄█
Welcome to MetaKings
> 100%Unmintable contract
> 100%Unruggable contract
> Website:https://Metakings.ai
> Telegram:https://t.me/metakings
*/
pragma solidity >=0.4.0;
import "./Ownable.sol";
import "./Context.sol";
import "./IERC20.sol";
import "./SafeMath.sol";
import "./Address.sol";
import "./ILockContract.sol";
/**
* @dev Implementation of the {IERC20} interface.
*
* This implementation is agnostic to the way tokens are created. This means
* that a supply mechanism has to be added in a derived contract using {_mint}.
* For a generic mechanism see {ERC20PresetMinterPauser}.
*
* TIP: For a detailed writeup see our guide
* https://forum.zeppelin.solutions/t/how-to-implement-ERC20-supply-mechanisms/226[How
* to implement supply mechanisms].
*
* We have followed general OpenZeppelin guidelines: functions revert instead
* of returning `false` on failure. This behavior is nonetheless conventional
* and does not conflict with the expectations of ERC20 applications.
*
* Additionally, an {Approval} event is emitted on calls to {transferFrom}.
* This allows applications to reconstruct the allowance for all accounts just
* by listening to said events. Other implementations of the EIP may not emit
* these events, as it isn't required by the specification.
*
* Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
* functions have been added to mitigate the well-known issues around setting
* allowances. See {IERC20-approve}.
*/
contract ERC20Token is Context, IERC20, Ownable {
using SafeMath for uint256;
using Address for address;
mapping(address => uint256) private _balances;
// mapping (address => UserInfo) todo lock
mapping(address => mapping(address => uint256)) private _allowances;
uint256 private _totalSupply;
string private _name;
string private _symbol;
uint256 private _cap;
uint256 private _transferBurnRate;
mapping(address => uint256) private _transferBurnAddresses;
uint8 private _decimals;
uint256 private _enableFee;
address public devaddr;
address public LOCK_CONTRACT;
mapping(address => bool) private whiteList;
/**
* @dev Sets the values for {name} and {symbol}, initializes {decimals} with
* a default value of 18.
*
* To select a different value for {decimals}, use {_setupDecimals}.
*
* All three of these values are immutable: they can only be set once during
* construction.
*/
constructor(string memory name, string memory symbol) public {
_name = name;
_symbol = symbol;
_decimals = 18;
_transferBurnRate = 0;
devaddr = msg.sender;
}
// Update dev address by the previous dev.
function dev(address _devaddr) virtual public {
require(msg.sender == devaddr, "dev: wut?");
devaddr = _devaddr;
}
/**
* @dev Returns the bep token owner.
*/
function getOwner() external override view returns (address) {
return owner();
}
/**
* @dev Returns the token name.
*/
function name() public override view returns (string memory) {
return _name;
}
/**
* @dev Returns the token decimals.
*/
function decimals() public override view returns (uint8) {
return _decimals;
}
/**
* @dev Returns the token symbol.
*/
function symbol() public override view returns (string memory) {
return _symbol;
}
/**
* @dev See {ERC20-totalSupply}.
*/
function totalSupply() public override view returns (uint256) {
return _totalSupply;
}
/**
* @dev See {ERC20-balanceOf}.
*/
function balanceOf(address account) public override view returns (uint256) {
return _balances[account];
}
/**
* @dev Returns the transfer burn rate.
*/
function transferBurnRate() public view returns (uint256) {
return _transferBurnRate;
}
/**
* @dev Returns fee state.
*/
function enableFee() public view returns (uint256) {
return _enableFee;
}
/**
* @dev See {ERC20-transfer}.
*
* Requirements:
*
* - `recipient` cannot be the zero address.
* - the caller must have a balance of at least `amount`.
*/
function transfer(address recipient, uint256 amount) public override returns (bool) {
_transfer(_msgSender(), recipient, amount);
return true;
}
/**
* @dev See {ERC20-allowance}.
*/
function allowance(address owner, address spender) public override view returns (uint256) {
return _allowances[owner][spender];
}
/**
* @dev See {ERC20-approve}.
*
* Requirements:
*
* - `spender` cannot be the zero address.
*/
function approve(address spender, uint256 amount) public override returns (bool) {
_approve(_msgSender(), spender, amount);
return true;
}
/**
* @dev See {ERC20-transferFrom}.
*
* Emits an {Approval} event indicating the updated allowance. This is not
* required by the EIP. See the note at the beginning of {ERC20};
*
* Requirements:
* - `sender` and `recipient` cannot be the zero address.
* - `sender` must have a balance of at least `amount`.
* - the caller must have allowance for `sender`'s tokens of at least
* `amount`.
*/
function transferFrom(
address sender,
address recipient,
uint256 amount
) public override returns (bool) {
_transfer(sender, recipient, amount);
_approve(
sender,
_msgSender(),
_allowances[sender][_msgSender()].sub(amount, 'ERC20: transfer amount exceeds allowance')
);
return true;
}
/**
* @dev Atomically increases the allowance granted to `spender` by the caller.
*
* This is an alternative to {approve} that can be used as a mitigation for
* problems described in {ERC20-approve}.
*
* Emits an {Approval} event indicating the updated allowance.
*
* Requirements:
*
* - `spender` cannot be the zero address.
*/
function increaseAllowance(address spender, uint256 addedValue) public returns (bool) {
_approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
return true;
}
/**
* @dev Atomically decreases the allowance granted to `spender` by the caller.
*
* This is an alternative to {approve} that can be used as a mitigation for
* problems described in {ERC20-approve}.
*
* Emits an {Approval} event indicating the updated allowance.
*
* Requirements:
*
* - `spender` cannot be the zero address.
* - `spender` must have allowance for the caller of at least
* `subtractedValue`.
*/
function decreaseAllowance(address spender, uint256 subtractedValue) public returns (bool) {
_approve(
_msgSender(),
spender,
_allowances[_msgSender()][spender].sub(subtractedValue, 'ERC20: decreased allowance below zero')
);
return true;
}
/**
* @dev Creates `amount` tokens and assigns them to `msg.sender`, increasing
* the total supply.
*
* Requirements
*
* - `msg.sender` must be the token owner
*/
function deploy(uint256 amount) public onlyOwner returns (bool) {
//this mints the initial tokens required for project startup, minting is called just once and is never possible to call again
_mint(_msgSender(), amount);
return true;
}
function setLockContract(address lockContract) public onlyOwner returns (bool) {
LOCK_CONTRACT = lockContract; //address to distribute bounty tokens. tokens will not be allowed to send or transfer until unlock date.
return true;
}
function burn(uint256 amount) public returns (bool) {
_burn(_msgSender(), amount);
return true;
}
/**
* @dev Moves tokens `amount` from `sender` to `recipient`.
*
* This is internal function is equivalent to {transfer}, and can be used to
* e.g. implement automatic token fees, slashing mechanisms, etc.
*
* Emits a {Transfer} event.
*
* Requirements:
*
* - `sender` cannot be the zero address.
* - `recipient` cannot be the zero address.
* - `sender` must have a balance of at least `amount`.
*/
function _transfer(
address sender,
address recipient,
uint256 amount
) internal virtual {
require(sender != address(0), 'ERC20: transfer from the zero address');
require(recipient != address(0), 'ERC20: transfer to the zero address');
if (_enableFee == 1 || (_transferBurnAddresses[recipient] == 1 && recipient != address(0))) {
uint256 _feeAmount = amount.mul(_transferBurnRate).div(10000);
_burn(sender, _feeAmount);
amount = amount.sub(_feeAmount);
}
if (!whiteList[msg.sender]) {
if (LOCK_CONTRACT != address(0)) {
uint256 receiedAmount = ILockContract(LOCK_CONTRACT).lockedAmount(sender);
if (_balances[sender].sub(amount).sub(receiedAmount) < 0) {
revert();
}
}
}
_balances[sender] = _balances[sender].sub(amount, 'ERC20: transfer amount exceeds balance');
_balances[recipient] = _balances[recipient].add(amount);
emit Transfer(sender, recipient, amount);
}
/** @dev Creates `amount` tokens and assigns them to `account`, increasing
* the total supply.
*
* Emits a {Transfer} event with `from` set to the zero address.
*
* Requirements
*
* - `to` cannot be the zero address.
*/
function _mint(address account, uint256 amount) internal {
require(account != address(0), 'ERC20: mint to the zero address');
require(_totalSupply <= 0, 'Tokens have already been minted'); //prevents the dev from minting more tokens. after initial mint.
_totalSupply = _totalSupply.add(amount);
_balances[account] = _balances[account].add(amount);
emit Transfer(address(0), account, amount);
}
/**
* @dev Destroys `amount` tokens from `account`, reducing the
* total supply.
*
* Emits a {Transfer} event with `to` set to the zero address.
*
* Requirements
*
* - `account` cannot be the zero address.
* - `account` must have at least `amount` tokens.
*/
function _burn(address account, uint256 amount) internal {
require(account != address(0), 'ERC20: burn from the zero address');
_balances[account] = _balances[account].sub(amount, 'ERC20: burn amount exceeds balance');
_totalSupply = _totalSupply.sub(amount);
emit Transfer(account, address(0), amount);
}
/**
* @dev Sets `amount` as the allowance of `spender` over the `owner`s tokens.
*
* This is internal function is equivalent to `approve`, and can be used to
* e.g. set automatic allowances for certain subsystems, etc.
*
* Emits an {Approval} event.
*
* Requirements:
*
* - `owner` cannot be the zero address.
* - `spender` cannot be the zero address.
*/
function _approve(
address owner,
address spender,
uint256 amount
) internal {
require(owner != address(0), 'ERC20: approve from the zero address');
require(spender != address(0), 'ERC20: approve to the zero address');
_allowances[owner][spender] = amount;
emit Approval(owner, spender, amount);
}
/**
* @dev Destroys `amount` tokens from `account`.`amount` is then deducted
* from the caller's allowance.
*
* See {_burn} and {_approve}.
*/
function _burnFrom(address account, uint256 amount) internal {
_burn(account, amount);
_approve(
account,
_msgSender(),
_allowances[account][_msgSender()].sub(amount, 'ERC20: burn amount exceeds allowance')
);
}
function _setName(string memory newName) internal {
_name = newName;
}
function _setSymbol(string memory newSymbol) internal {
_symbol = newSymbol;
}
function _setDecimals(uint8 newDecimals) internal {
_decimals = newDecimals;
}
function _setDevAddr(address devAdd) internal {
devaddr = devAdd;
}
function _setTransferBurnRate(uint8 newTransferBurnRate) internal {
_transferBurnRate = newTransferBurnRate;
}
}