Contract Source Code:
File 1 of 1 : T2T2Coin
// SPDX-License-Identifier: MIT LICENSE
pragma solidity ^0.8.20;
//0.8.21 9974 shanghai
library SafeMath {
/**
* @dev Multiplies two numbers, throws on overflow.
*/
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;
}
/**
* @dev Integer division of two numbers, truncating the quotient.
*/
function div(uint256 a, uint256 b) internal pure returns (uint256) {
// assert(b > 0); // Solidity automatically throws when dividing by 0
uint256 c = a / b;
// assert(a == b * c + a % b); // There is no case in which this doesn't hold
return c;
}
/**
* @dev Substracts two numbers, throws on overflow (i.e. if subtrahend is greater than minuend).
*/
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
assert(b <= a);
return a - b;
}
/**
* @dev Adds two numbers, throws on overflow.
*/
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
assert(c >= a);
return c;
}
}
abstract contract Context {
function _msgSender() internal view virtual returns (address) {
return msg.sender;
}
function _msgData() internal view virtual returns (bytes calldata) {
return msg.data;
}
}
interface IERC20{
/**
* @dev Returns the amount of tokens in existence.
*/
function totalSupply() external view returns(uint256);
/**
* @dev Returns the amount of tokens owned by `account`.
*/
function balanceOf(address acount) external view returns(uint256);
/**
* @dev Moves `amount` tokens from the caller's account to `recipient`.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transfer(address recipient,uint256 amount) external returns (bool);
/**
* @dev Returns the remaining number of tokens that `spender` will be
* allowed to spend on behalf of `owner` through {transferFrom}. This is
* zero by default.
*
* This value changes when {approve} or {transferFrom} are called.
*/
function allowance(address owner,address spender) external view returns(uint256);
/**
* @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* IMPORTANT: Beware that changing an allowance with this method brings the risk
* that someone may use both the old and the new allowance by unfortunate
* transaction ordering. One possible solution to mitigate this race
* condition is to first reduce the spender's allowance to 0 and set the
* desired value afterwards:
* https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
*
* Emits an {Approval} event.
*/
function approve(address spender,uint256 amount)external returns(bool);
/**
* @dev Moves `amount` tokens from `sender` to `recipient` using the
* allowance mechanism. `amount` is then deducted from the caller's
* allowance.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transferFrom(address sender,address recipient,uint256 amount) external returns(bool);
/**
* @dev Emitted when `value` tokens are moved from one account (`from`) to
* another (`to`).
*
* Note that `value` may be zero.
*/
event Transfer(address indexed from, address indexed to, uint256 value);
/**
* @dev Emitted when the allowance of a `spender` for an `owner` is set by
* a call to {approve}. `value` is the new allowance.
*/
event Approval(address indexed owner, address indexed spender, uint256 value);
}
interface IERC20Metadata is IERC20 {
/**
* @dev Returns the name of the token.
*/
function name() external view returns(string memory);
/**
* @dev Returns the symbol of the token.
*/
function symbol() external view returns(string memory);
/**
* @dev Returns the decimals places of the token.
*/
function decimals() external view returns(uint8);
}
contract ERC20 is Context, IERC20, IERC20Metadata {
using SafeMath for uint256;
mapping(address => uint256) private _balances;
mapping(address => mapping(address => uint256)) private _allowances;
uint256 private _totalSupply;
uint256 private _totalMintedSupply;
string private _name;
string private _symbol;
uint8 private _decimals;
/**
* @dev Sets the values for {name} and {symbol}.
*
* The default value of {decimals} is 18. To select a different value for
* {decimals} you should overload it.
*
* All two of these values are immutable: they can only be set once during
* construction.
*/
constructor(string memory name_, string memory sysmbol_) {
_name = name_;
_symbol = sysmbol_;
_decimals=18;
_totalSupply =10000000000000000000000000000;
_totalMintedSupply=0;
}
/**
* @dev Retruns the name of the token.
*
*/
function name() public view virtual override returns (string memory) {
return _name;
}
/**
* @dev Returns the symbol of the token, usually a shorter version of the
* name.
*/
function symbol() public view virtual override returns (string memory) {
return _symbol;
}
/**
* @dev Returns the number of decimals used to get its user representation.
* For example, if `decimals` equals `2`, a balance of `505` tokens should
* be displayed to a user as `5.05` (`505 / 10 ** 2`).
*
* Tokens usually opt for a value of 18, imitating the relationship between
* Ether and Wei. This is the value {ERC20} uses, unless this function is
* overridden;
*
* NOTE: This information is only used for _display_ purposes: it in
* no way affects any of the arithmetic of the contract, including
* {IERC20-balanceOf} and {IERC20-transfer}.
*/ /**
* @dev Returns the number of decimals used to get its user representation.
* For example, if `decimals` equals `2`, a balance of `505` tokens should
* be displayed to a user as `5.05` (`505 / 10 ** 2`).
*
* Tokens usually opt for a value of 18, imitating the relationship between
* Ether and Wei. This is the value {ERC20} uses, unless this function is
* overridden;
*
* NOTE: This information is only used for _display_ purposes: it in
* no way affects any of the arithmetic of the contract, including
* {IERC20-balanceOf} and {IERC20-transfer}.
*/
function decimals() public view virtual override returns (uint8) {
return _decimals;
}
function _setDecimals(uint8 decimals_) internal virtual{
_decimals = decimals_;
}
function _resetNameErc20(
string memory name_,
string memory symbol_
) internal virtual {
_name = name_;
_symbol = symbol_;
}
/**
* @dev See {IERC20-totalSupply}.
*/
function totalSupply() public view virtual override returns (uint256) {
return _totalSupply;
}
/**
* @dev See {ERC20-totalSupply}.
*/
function totalMintedSupply() public view returns (uint256) {
return _totalMintedSupply;
}
/**
* @dev See {IERC20-balanceOf}.
*/
function balanceOf(
address account
) public view virtual override returns (uint256) {
return _balances[account];
}
/**
* @dev See {IERC20-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 virtual override returns (bool) {
_transfer(_msgSender(), recipient, amount);
return true;
}
/**
* @dev See {IERC20-allowance}.
*/
function allowance(
address owner,
address spender
) public view virtual override returns (uint256) {
return _allowances[owner][spender];
}
/**
* @dev See {IERC20-approve}.
*
* Requirements:
*
* - `spender` cannot be the zero address.
*/
function approve(
address spender,
uint256 amount
) public virtual override returns (bool) {
_approve(_msgSender(), spender, amount);
return true;
}
function transferFrom(
address sender,
address recipient,
uint256 amount
) public virtual override returns (bool) {
_transfer(sender, recipient, amount);
uint256 currentAllowance = _allowances[sender][_msgSender()];
require(
currentAllowance >= amount,
"ERC20: transfer amount exceeds allowance"
);
unchecked {
_approve(sender, _msgSender(), currentAllowance - amount);
}
return true;
}
function increaseAllowance(
address spender,
uint256 addedValue
) public virtual returns (bool) {
_approve(
_msgSender(),
spender,
_allowances[_msgSender()][spender] + addedValue
);
return true;
}
function decreaseAllowance(
address spender,
uint256 subtractedValue
) public virtual returns (bool) {
uint256 currentAllowance = _allowances[_msgSender()][spender];
require(
currentAllowance >= subtractedValue,
"ERC20: decreased allowance below zero"
);
unchecked {
_approve(_msgSender(), spender, currentAllowance - subtractedValue);
}
return true;
}
/**
* @dev Moves `amount` of tokens from `sender` to `recipient`.
*
* This 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");
_beforeTokenTransfer(sender, recipient, amount);
uint256 senderBalance = _balances[sender];
require(
senderBalance >= amount,
"ERC20: transfer amount exceeds balance"
);
unchecked {
// _balances[sender] = senderBalance - amount;
_balances[sender] = senderBalance.sub(amount);
}
// _balances[recipient] += amount;
_balances[recipient] = _balances[recipient].add(amount);
emit Transfer(sender, recipient, amount);
_afterTokenTransfer(sender, recipient, amount);
}
function _mint(address account, uint256 amount) internal virtual {
require(account != address(0), "ERC20: mint to the zero address");
_totalMintedSupply = _totalMintedSupply.add(amount);
require(_totalMintedSupply<=_totalSupply," totalSupply error ");
_beforeTokenTransfer(address(0), account, amount);
_balances[account] = _balances[account].add(amount);
emit Transfer(address(0), account, amount);
_afterTokenTransfer(address(0), account, amount);
}
function _burn(address account, uint256 amount) internal virtual {
require(account != address(0), "ERC20: burn from the zero address");
// require(_totalSupply>=amount, "ERC20: burn not enough _totalSupply");
_beforeTokenTransfer(account, address(0), amount);
uint256 accountBalance = _balances[account];
require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
unchecked {
// _balances[account] = accountBalance - amount;
_balances[account] = accountBalance.sub(amount);
}
// _totalSupply -= amount;
_totalMintedSupply = _totalMintedSupply.sub(amount);
_totalSupply = _totalSupply.sub(amount);
emit Transfer(account, address(0), amount);
_afterTokenTransfer(account, address(0), amount);
}
function _approve(
address owner,
address spender,
uint256 amount
) internal virtual {
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);
}
function _beforeTokenTransfer(
address from,
address to,
uint256
) internal virtual {}
function _afterTokenTransfer(
address from,
address to,
uint256 amount
) internal virtual {}
}
abstract contract Ownable is Context {
address private _owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
/**
* @dev Initializes the contract setting the deployer as the initial owner.
*/
constructor() {
_setOwner(_msgSender());
}
/**
* @dev Returns the address of the current owner
*/
function owner() public view virtual returns(address){
return _owner;
}
/**
* @dev Throws if called by any account other than the owner
*/
modifier onlyOwner(){
require(owner()==_msgSender(),"Ownable: caller is not the owner");
_;
}
/**
* @dev Leaves the contract without owner. It will not be possible to call
* `onlyOwner` functions anymore. Can only be called by the current owner.
*
* NOTE: Renouncing ownership will leave the contract without an owner,
* thereby removing any functionality that is only available to the owner.
*/
function renounceOwnership() public virtual onlyOwner{
_setOwner(address(0));
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Can only be called by the current owner.
*/
function transferOwnership(address newOwner) public virtual onlyOwner {
require(newOwner != address(0), "Ownable: new owner is the zero address");
_setOwner(newOwner);
}
/**
* @dev Returns the address of the current owner.
*/
function _setOwner(address newOwner) private {
address oldOwner = _owner;
_owner = newOwner;
emit OwnershipTransferred(oldOwner, newOwner);
}
}
abstract contract Pausable is Context {
/**
* @dev Emitted when the pause is triggered by `account`.
*/
event Paused(address account);
/**
* @dev Emitted when the pause is lifted by `account`.
*/
event Unpaused(address account);
bool private _paused;
/**
* @dev Initializes the contract in unpaused state.
*/
constructor() {
_paused = false;
}
/**
* @dev Modifier to make a function callable only when the contract is not paused.
*
* Requirements:
*
* - The contract must not be paused.
*/
modifier whenNotPaused() {
_requireNotPaused();
_;
}
/**
* @dev Modifier to make a function callable only when the contract is paused.
*
* Requirements:
*
* - The contract must be paused.
*/
modifier whenPaused() {
_requirePaused();
_;
}
/**
* @dev Returns true if the contract is paused, and false otherwise.
*/
function paused() public view virtual returns (bool) {
return _paused;
}
/**
* @dev Throws if the contract is paused.
*/
function _requireNotPaused() internal view virtual {
require(!paused(), "Pausable: paused");
}
/**
* @dev Throws if the contract is not paused.
*/
function _requirePaused() internal view virtual {
require(paused(), "Pausable: not paused");
}
/**
* @dev Triggers stopped state.
*
* Requirements:
*
* - The contract must not be paused.
*/
function _pause() internal virtual whenNotPaused {
_paused = true;
emit Paused(_msgSender());
}
/**
* @dev Returns to normal state.
*
* Requirements:
*
* - The contract must be paused.
*/
function _unpause() internal virtual whenPaused {
_paused = false;
emit Unpaused(_msgSender());
}
}
contract Utilities is Ownable,Pausable{
modifier nonZeroAddress(address _address){
require(address(0)!=_address,"0 address");
_;
}
modifier nonZeroLength(uint[] memory _array){
require(_array.length > 0, "Empty array");
_;
}
modifier lengthsAreEqual(uint[] memory _array1, uint[] memory _array2) {
require(_array1.length == _array2.length, "Unequal lengths");
_;
}
modifier onlyEOA(){
require(msg.sender==tx.origin,"No contracts");
_;
}
function isOwner() internal view returns(bool)
{
return owner()==msg.sender;
}
}
contract Adminable is Utilities{
mapping(address=>bool) private admins;
constructor(){
}
function addAdmin(address _address) external onlyOwner{
admins[_address]=true;
}
function addAdmins(address[] calldata _addresses) external onlyOwner{
uint256 len = _addresses.length;
for(uint256 i=0;i<len;i++)
{
admins[_addresses[i]]=true;
}
}
function removeAdmin(address _address) external onlyOwner{
admins[_address]=false;
}
function removeAdmins(address[] calldata _addresses) external onlyOwner{
uint256 len = _addresses.length;
for(uint256 i=0;i<len;i++)
{
admins[_addresses[i]]=false;
}
}
function setPause(bool _shouldPause) external onlyAdminOrOwner{
if(_shouldPause)
{
_pause();
}else
{
_unpause();
}
}
function isAdmin(address _address) public view returns(bool){
return admins[_address];
}
modifier onlyAdmin(){
require(admins[msg.sender], "Not admin");
_;
}
modifier onlyAdminOrOwner(){
require(admins[msg.sender]||isOwner(), "Not admin or owner");
_;
}
}
contract T2T2Coin is ERC20,Adminable {
// address => allowedToCallFunctions
mapping(address => bool) private admins;
constructor() ERC20("T2T2", "T2T2") {
}
function setDecimals(uint8 decimals_) external onlyOwner{
_setDecimals(decimals_);
}
function resetNameCoin(string calldata name_,string calldata symbol_) external onlyOwner{
_resetNameErc20(name_,symbol_);
}
/**
* mints $T2T2 to a recipient
* @param to the recipient of the $T2T2
* @param amount the amount of $T2T2 to mint
*/
function mint(address to, uint256 amount) external whenNotPaused onlyAdminOrOwner {
require(isAdmin(msg.sender), "T2T2: Only admins can mint");
_mint(to, amount);
}
/**
* @dev See {IERC20-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 to,
uint256 amount
) public override whenNotPaused returns (bool) {
return super.transferFrom(sender, to, amount);
}
function balanceOf(address account) public view virtual override returns (uint256) {
return super.balanceOf(account);
}
function transfer(address recipient, uint256 amount) public virtual override whenNotPaused returns (bool) {
return super.transfer(recipient, amount);
}
// Not ensuring state changed in this block as it would needlessly increase gas
function allowance(address owner, address spender) public view virtual override whenNotPaused returns (uint256) {
return super.allowance(owner, spender);
}
// Not ensuring state changed in this block as it would needlessly increase gas
function approve(address spender, uint256 amount) public virtual override whenNotPaused returns (bool) {
return super.approve(spender, amount);
}
// Not ensuring state changed in this block as it would needlessly increase gas
function increaseAllowance(address spender, uint256 addedValue) public virtual override whenNotPaused returns (bool) {
return super.increaseAllowance(spender, addedValue);
}
// Not ensuring state changed in this block as it would needlessly increase gas
function decreaseAllowance(address spender, uint256 subtractedValue) public virtual override whenNotPaused returns (bool) {
return super.decreaseAllowance(spender, subtractedValue);
}
}
