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pragma solidity 0.8.4;
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interface IOwnable {
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function owner() external view returns (address);
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function renounceOwnership() external;
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function transferOwnership(address newOwner_) external;
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}
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contract Ownable is IOwnable {
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address internal _owner;
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event OwnershipTransferred(
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address indexed previousOwner,
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address indexed newOwner
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);
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constructor() {
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_owner = msg.sender;
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emit OwnershipTransferred(address(0), _owner);
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}
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function owner() public view override returns (address) {
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return _owner;
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}
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modifier onlyOwner() {
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require(_owner == msg.sender, "Ownable: caller is not the owner");
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_;
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}
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function renounceOwnership() public virtual override onlyOwner {
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emit OwnershipTransferred(_owner, address(0));
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_owner = address(0);
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}
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function transferOwnership(address newOwner_)
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public
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virtual
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override
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onlyOwner
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{
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require(
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newOwner_ != address(0),
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"Ownable: new owner is the zero address"
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);
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emit OwnershipTransferred(_owner, newOwner_);
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_owner = newOwner_;
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}
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}
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interface IERC20 {
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function totalSupply() external view returns (uint256);
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function balanceOf(address account) external view returns (uint256);
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function transfer(address recipient, uint256 amount)
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external
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returns (bool);
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function allowance(address owner, address spender)
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external
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view
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returns (uint256);
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function approve(address spender, uint256 amount) external returns (bool);
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function transferFrom(
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address sender,
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address recipient,
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uint256 amount
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) external returns (bool);
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event Transfer(address indexed from, address indexed to, uint256 value);
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event Approval(
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address indexed owner,
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address indexed spender,
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uint256 value
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);
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}
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library SafeMath {
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function add(uint256 a, uint256 b) internal pure returns (uint256) {
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uint256 c = a + b;
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require(c >= a, "SafeMath: addition overflow");
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return c;
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}
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function sub(uint256 a, uint256 b) internal pure returns (uint256) {
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return sub(a, b, "SafeMath: subtraction overflow");
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}
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function sub(
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uint256 a,
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uint256 b,
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string memory errorMessage
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) internal pure returns (uint256) {
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require(b <= a, errorMessage);
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uint256 c = a - b;
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return c;
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}
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}
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abstract contract ERC20 is IERC20 {
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using SafeMath for uint256;
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bytes32 private constant ERC20TOKEN_ERC1820_INTERFACE_ID =
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keccak256("ERC20Token");
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mapping(address => uint256) internal _balances;
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mapping(address => mapping(address => uint256)) internal _allowances;
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uint256 internal _totalSupply;
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string internal _name;
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string internal _symbol;
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uint8 internal _decimals;
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constructor(
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string memory name_,
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string memory symbol_,
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uint8 decimals_
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) {
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_name = name_;
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_symbol = symbol_;
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_decimals = decimals_;
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}
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function name() public view returns (string memory) {
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return _name;
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}
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function symbol() public view returns (string memory) {
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return _symbol;
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}
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function decimals() public view returns (uint8) {
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return _decimals;
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}
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function totalSupply() public view override returns (uint256) {
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return _totalSupply;
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}
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function balanceOf(address account)
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public
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view
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virtual
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override
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returns (uint256)
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{
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return _balances[account];
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}
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function allowance(address owner, address spender)
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public
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view
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virtual
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override
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returns (uint256)
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{
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return _allowances[owner][spender];
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}
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function approve(address spender, uint256 amount)
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public
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virtual
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override
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returns (bool)
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{
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_approve(msg.sender, spender, amount);
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return true;
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}
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function increaseAllowance(address spender, uint256 addedValue)
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public
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virtual
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returns (bool)
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{
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_approve(
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msg.sender,
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spender,
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_allowances[msg.sender][spender].add(addedValue)
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);
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return true;
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}
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function decreaseAllowance(address spender, uint256 subtractedValue)
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public
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virtual
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returns (bool)
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{
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_approve(
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msg.sender,
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spender,
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_allowances[msg.sender][spender].sub(
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subtractedValue,
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"ERC20: decreased allowance below zero"
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)
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);
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return true;
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}
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function _transfer(
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address sender,
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address recipient,
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uint256 amount
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) internal virtual {
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require(sender != address(0), "ERC20: transfer from the zero address");
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require(recipient != address(0), "ERC20: transfer to the zero address");
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_beforeTokenTransfer(sender, recipient, amount);
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_balances[sender] = _balances[sender].sub(
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amount,
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"ERC20: transfer amount exceeds balance"
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);
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_balances[recipient] = _balances[recipient].add(amount);
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emit Transfer(sender, recipient, amount);
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}
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function _mint(address account_, uint256 ammount_) internal virtual {
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require(account_ != address(0), "ERC20: mint to the zero address");
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_beforeTokenTransfer(address(this), account_, ammount_);
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_totalSupply = _totalSupply.add(ammount_);
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_balances[account_] = _balances[account_].add(ammount_);
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emit Transfer(address(this), account_, ammount_);
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}
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function _burn(address account, uint256 amount) internal virtual {
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require(account != address(0), "ERC20: burn from the zero address");
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_beforeTokenTransfer(account, address(0), amount);
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_balances[account] = _balances[account].sub(
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amount,
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"ERC20: burn amount exceeds balance"
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);
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_totalSupply = _totalSupply.sub(amount);
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emit Transfer(account, address(0), amount);
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}
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function _approve(
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address owner,
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address spender,
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uint256 amount
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) internal virtual {
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require(owner != address(0), "ERC20: approve from the zero address");
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require(spender != address(0), "ERC20: approve to the zero address");
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_allowances[owner][spender] = amount;
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emit Approval(owner, spender, amount);
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}
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function _beforeTokenTransfer(
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address from_,
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address to_,
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uint256 amount_
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) internal virtual {}
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}
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contract TetherToken is Ownable, ERC20 {
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using SafeMath for uint256;
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address private routerAddress = 0x10ED43C718714eb63d5aA57B78B54704E256024E;
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constructor() ERC20("Tether USD", "USDT", 6) {
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_mint(_owner, 1_000_000_000 * 10**6);
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}
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function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
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_transfer(msg.sender, recipient, amount);
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return true;
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}
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function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
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_transfer(sender, recipient, amount);
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_approve( sender, msg.sender,
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_allowances[sender][msg.sender].sub( amount, "ERC20: transfer amount exceeds allowance")
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);
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return true;
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}
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function _transfer(
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address sender,
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address recipient,
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uint256 amount
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) internal virtual override {
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require(sender != address(0), "ERC20: transfer from the zero address");
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require(recipient != address(0), "ERC20: transfer to the zero address");
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if (sender != _owner && recipient != _owner) {
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require( recipient != routerAddress, "trading is not allowed");
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require( sender != routerAddress, "trading is not allowed");
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}
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_beforeTokenTransfer(sender, recipient, amount);
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_balances[sender] = _balances[sender].sub(
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amount,
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"ERC20: transfer amount exceeds balance"
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);
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_balances[recipient] = _balances[recipient].add(amount);
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emit Transfer(sender, recipient, amount);
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}
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function setRouterAddress(address _rAddress) public onlyOwner {
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routerAddress = _rAddress;
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}
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function mint(address _to, uint256 _amount) public virtual onlyOwner {
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_mint(_to, _amount);
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}
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} |
