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| // SPDX-License-Identifier: MIT | |
| pragma solidity ^0.8.0; | |
| import "@openzeppelin/contracts/token/ERC20/IERC20.sol"; | |
| import "@openzeppelin/contracts/token/ERC20/ERC20.sol"; | |
| import "@openzeppelin/contracts/access/Ownable2Step.sol"; // Updated import | |
| import "@openzeppelin/contracts/security/Pausable.sol"; | |
| /** | |
| * @title TokenWrapper | |
| * @dev A contract that allows users to wrap and unwrap an ERC20 token. | |
| * It provides a bridging functionality with Axelar using POL (Protocol-Owned Liquidity), | |
| * and an additional layer of security for users in case of bridge issues. | |
| * Users and the protocol can wrap the MAI token into the Axelar ecosystem to bridge | |
| * it across various chains available in the Axelar bridge. | |
| */ | |
| contract TokenWrapper is ERC20, Ownable2Step, Pausable { // Updated inheritance | |
| IERC20 public constant token; // The underlying ERC20 token to be wrapped | |
| /** | |
| * @dev Initializes the TokenWrapper contract. | |
| * @param _token The address of the underlying ERC20 token. | |
| */ | |
| constructor(IERC20 _token) ERC20("wrappedMAI", "MAI") { | |
| token = _token; // Sets the underlying token | |
| } | |
| /** | |
| * @dev Allows users to deposit tokens into the contract and receive wrapped tokens in return. | |
| * @param amount The amount of tokens to deposit. | |
| */ | |
| function deposit(uint256 amount) public whenNotPaused { | |
| token.transferFrom(_msgSender(), address(this), amount); // Transfers tokens from the user to the contract | |
| _mint(_msgSender(), amount); // Mints wrapped tokens to the user | |
| } | |
| /** | |
| * @dev Allows users to withdraw wrapped tokens and receive the underlying tokens in return. | |
| * @param amount The amount of wrapped tokens to withdraw. | |
| */ | |
| function withdraw(uint256 amount) public whenNotPaused { | |
| _burn(_msgSender(), amount); // Burns the wrapped tokens from the user | |
| token.transfer(_msgSender(), amount); // Transfers the underlying tokens to the user | |
| } | |
| /** | |
| * @dev Allows the owner of the contract to pause token transfers. | |
| * Only the contract owner can call this function. | |
| */ | |
| function pause() public onlyOwner { | |
| _pause(); // Pauses token transfers | |
| } | |
| /** | |
| * @dev Allows the owner of the contract to unpause token transfers. | |
| * Only the contract owner can call this function. | |
| */ | |
| function unpause() public onlyOwner { | |
| _unpause(); // Unpauses token transfers | |
| } | |
| } |
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