Contract Source Code:
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable.sol)
pragma solidity ^0.8.0;
import "../utils/Context.sol";
/**
* @dev Contract module which provides a basic access control mechanism, where
* there is an account (an owner) that can be granted exclusive access to
* specific functions.
*
* By default, the owner account will be the one that deploys the contract. This
* can later be changed with {transferOwnership}.
*
* This module is used through inheritance. It will make available the modifier
* `onlyOwner`, which can be applied to your functions to restrict their use to
* the owner.
*/
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() {
_transferOwnership(_msgSender());
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
_checkOwner();
_;
}
/**
* @dev Returns the address of the current owner.
*/
function owner() public view virtual returns (address) {
return _owner;
}
/**
* @dev Throws if the sender is not the owner.
*/
function _checkOwner() internal view virtual {
require(owner() == _msgSender(), "Ownable: caller is not the owner");
}
/**
* @dev Leaves the contract without owner. It will not be possible to call
* `onlyOwner` functions. Can only be called by the current owner.
*
* NOTE: Renouncing ownership will leave the contract without an owner,
* thereby disabling any functionality that is only available to the owner.
*/
function renounceOwnership() public virtual onlyOwner {
_transferOwnership(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");
_transferOwnership(newOwner);
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Internal function without access restriction.
*/
function _transferOwnership(address newOwner) internal virtual {
address oldOwner = _owner;
_owner = newOwner;
emit OwnershipTransferred(oldOwner, newOwner);
}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (security/Pausable.sol)
pragma solidity ^0.8.0;
import "../utils/Context.sol";
/**
* @dev Contract module which allows children to implement an emergency stop
* mechanism that can be triggered by an authorized account.
*
* This module is used through inheritance. It will make available the
* modifiers `whenNotPaused` and `whenPaused`, which can be applied to
* the functions of your contract. Note that they will not be pausable by
* simply including this module, only once the modifiers are put in place.
*/
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());
}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)
pragma solidity ^0.8.0;
/**
* @dev Provides information about the current execution context, including the
* sender of the transaction and its data. While these are generally available
* via msg.sender and msg.data, they should not be accessed in such a direct
* manner, since when dealing with meta-transactions the account sending and
* paying for execution may not be the actual sender (as far as an application
* is concerned).
*
* This contract is only required for intermediate, library-like contracts.
*/
abstract contract Context {
function _msgSender() internal view virtual returns (address) {
return msg.sender;
}
function _msgData() internal view virtual returns (bytes calldata) {
return msg.data;
}
}
// SPDX-License-Identifier: MIT
//
// ____ ____ ________ ______ _____ ________ _ ___ ____ _________
// |_ \ / _| |_ __ | |_ _ `. |_ _| |_ __ | / \ |_ ||_ _| | _ _ |
// | \/ | | |_ \_| | | `. \ | | | |_ \_| / _ \ | |_/ / |_/ | | \_|
// | |\ /| | | _| _ | | | | | | | _| / ___ \ | __'. | |
// _| |_\/_| |_ _| |__/ | _| |_.' / _| |_ _| |_ _/ / \ \_ _| | \ \_ _| |_
// |_____||_____| |________| |______.' |_____| |_____| |____| |____| |____||____| |_____|
//
//
pragma solidity ^0.8.0;
import './Security.sol';
contract MEDIFAKT is Security {
string private _name;
string private _symbol;
uint256 private _decimals;
uint256 private _totalSupply;
mapping(address => uint256) private _balances;
mapping(address => mapping(address => uint256)) private _allowances;
constructor() {
_name = "MEDIFAKT";
_symbol = "FAKT";
_decimals = 18;
_mint(_msgSender(), 999999999 * 10 ** 18);
}
/**
* @dev Returns the name of the token.
*/
function name() public view returns (string memory) {
return _name;
}
/**
* @dev Returns the symbol of the token.
*/
function symbol() public view returns (string memory) {
return _symbol;
}
/**
* @dev Returns the decimals of the token.
*/
function decimals() public view returns (uint256) {
return _decimals;
}
/**
* @dev Returns the total supply of the token.
*/
function totalSupply() public view returns (uint256) {
return _totalSupply;
}
/**
* @dev Returns the amount of tokens owned by `account`.
*/
function balanceOf(address account) public view returns (uint256) {
return _balances[account];
}
/**
* @dev Returns the allowances.
*/
function allowance(address owner, address spender) public view returns (uint256) {
return _allowances[owner][spender];
}
/**
* @dev Mints the amount of tokens by owner.
*/
function mint(uint256 amount) public onlyOwner {
_mint(_msgSender(), amount);
}
/**
* @dev Burns the amount of tokens owned by caller.
*/
function burn(uint256 amount) public {
_burn(_msgSender(), amount);
}
/**
* @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
*/
function approve(address spender, uint256 amount) public whenNotPaused returns (bool) {
address owner = _msgSender();
require(!isBlackListed[owner], "FAKT: locked account");
_approve(owner, spender, amount);
return true;
}
/**
* @dev Increases the allowance of `spender` by `amount`.
*/
function increaseAllowance(address spender, uint256 addedValue) public whenNotPaused returns (bool) {
address owner = _msgSender();
require(!isBlackListed[owner], "FAKT: locked account");
_approve(owner, spender, allowance(owner, spender) + addedValue);
return true;
}
/**
* @dev Decreases the allowance of `spender` by `amount`.
*/
function decreaseAllowance(address spender, uint256 subtractedValue) public whenNotPaused returns (bool) {
address owner = _msgSender();
uint256 currentAllowance = allowance(owner, spender);
require(!isBlackListed[owner], "FAKT: locked account");
require(currentAllowance >= subtractedValue, "FAKT: decreased allowance below zero");
unchecked {
_approve(owner, spender, currentAllowance - subtractedValue);
}
return true;
}
/**
* @dev Moves `amount` tokens from the caller's account to `to`.
*/
function transfer(address to, uint256 amount) public whenNotPaused returns (bool) {
address owner = _msgSender();
require(!isBlackListed[owner], "FAKT: locked account");
_transfer(owner, to, amount);
return true;
}
/**
* @dev Moves `amount` tokens from `from` to `to` using the
* allowance mechanism. `amount` is then deducted from the caller's
* allowance.
*/
function transferFrom(address from, address to, uint256 amount) public whenNotPaused returns (bool) {
address spender = _msgSender();
require(!isBlackListed[from], "FAKT: locked account");
_spendAllowance(from, spender, amount);
_transfer(from, to, amount);
return true;
}
/*////////////////////////////////////////////////
INTERNAL FUNCTIONS
////////////////////////////////////////////////*/
function _mint(address account, uint256 amount) internal {
require(account != address(0), "FAKT: mint to the zero address");
_beforeTokenTransfer(address(0), account, amount);
_totalSupply += amount;
unchecked {
// Overflow not possible: balance + amount is at most totalSupply + amount, which is checked above.
_balances[account] += amount;
}
emit Transfer(address(0), account, amount);
_afterTokenTransfer(address(0), account, amount);
}
function _burn(address account, uint256 amount) internal {
require(account != address(0), "FAKT: burn from the zero address");
_beforeTokenTransfer(account, address(0), amount);
uint256 accountBalance = _balances[account];
require(accountBalance >= amount, "FAKT: burn amount exceeds balance");
unchecked {
_balances[account] = accountBalance - amount;
// Overflow not possible: amount <= accountBalance <= totalSupply.
_totalSupply -= amount;
}
emit Transfer(account, address(0), amount);
_afterTokenTransfer(account, address(0), amount);
}
function _approve(address owner, address spender, uint256 amount) internal {
require(owner != address(0), "FAKT: approve from the zero address");
require(spender != address(0), "FAKT: approve to the zero address");
_allowances[owner][spender] = amount;
emit Approval(owner, spender, amount);
}
function _spendAllowance(address owner, address spender, uint256 amount) internal virtual {
uint256 currentAllowance = allowance(owner, spender);
if (currentAllowance != type(uint256).max) {
require(currentAllowance >= amount, "FAKT: insufficient allowance");
unchecked {
_approve(owner, spender, currentAllowance - amount);
}
}
}
function _transfer(address from, address to, uint256 amount) internal {
require(from != address(0), "FAKT: transfer from the zero address");
require(to != address(0), "FAKT: transfer to the zero address");
_beforeTokenTransfer(from, to, amount);
uint256 fromBalance = _balances[from];
require(fromBalance >= amount, "FAKT: transfer amount exceeds balance");
unchecked {
_balances[from] = fromBalance - amount;
// Overflow not possible: the sum of all balances is capped by totalSupply, and the sum is preserved by
// decrementing then incrementing.
_balances[to] += amount;
}
emit Transfer(from, to, amount);
_afterTokenTransfer(from, to, amount);
}
function _beforeTokenTransfer(address from, address to, uint256 amount) internal {}
function _afterTokenTransfer(address from, address to, uint256 amount) internal {}
/*////////////////////////////////////////////////
EVENTS
////////////////////////////////////////////////*/
event Approval(address indexed owner, address indexed spender, uint256 value);
event Transfer(address indexed from, address indexed to, uint256 value);
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/security/Pausable.sol";
contract Security is Ownable, Pausable {
mapping(address => bool) isBlackListed;
/**
* @dev Pauses the contract.
*/
function pause() public onlyOwner {
_pause();
}
/**
* @dev Unpause the contract.
*/
function unpause() public onlyOwner {
_unpause();
}
/**
* @dev Adds `account` to the blacklist.
*/
function lockUser(address account) external onlyOwner {
isBlackListed[account] = true;
emit LockedUser(account);
}
/**
@dev Removes `account` from the blacklist.
*/
function unlockUser(address account) external onlyOwner {
isBlackListed[account] = false;
emit UnlockedUser(account);
}
event LockedUser(address indexed account);
event UnlockedUser(address indexed account);
}