GPT

ERC-20 Token with Access Control

// SPDX-License-Identifier: MIT pragma solidity ^0.8.24; import {ERC20} from "@openzeppelin/contracts/token/ERC20/ERC20.sol"; import {ERC20Burnable} from "@openzeppelin/contracts/token/ERC20/extensions/ERC20Burnable.sol

Prompt text

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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.24;

import {ERC20} from "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import {ERC20Burnable} from "@openzeppelin/contracts/token/ERC20/extensions/ERC20Burnable.sol";
import {ERC20Permit} from "@openzeppelin/contracts/token/ERC20/extensions/ERC20Permit.sol";
import {AccessControl} from "@openzeppelin/contracts/access/AccessControl.sol";
import {Pausable} from "@openzeppelin/contracts/utils/Pausable.sol";

/// @title ProjectToken
/// @notice ERC-20 token with role-based minting, burning, and emergency pause
/// @dev Uses OpenZeppelin v5 contracts — no custom crypto
contract ProjectToken is ERC20, ERC20Burnable, ERC20Permit, AccessControl, Pausable {
 bytes32 public constant MINTER_ROLE = keccak256("MINTER_ROLE");
 bytes32 public constant PAUSER_ROLE = keccak256("PAUSER_ROLE");

 uint256 public immutable MAX_SUPPLY;

 error MaxSupplyExceeded(uint256 requested, uint256 available);

 constructor(
 string memory name_,
 string memory symbol_,
 uint256 maxSupply_
 ) ERC20(name_, symbol_) ERC20Permit(name_) {
 MAX_SUPPLY = maxSupply_;

 _grantRole(DEFAULT_ADMIN_ROLE, msg.sender);
 _grantRole(MINTER_ROLE, msg.sender);
 _grantRole(PAUSER_ROLE, msg.sender);
 }

 /// @notice Mint tokens to a recipient
 /// @param to Recipient address
 /// @param amount Amount of tokens to mint (in wei)
 function mint(address to, uint256 amount) external onlyRole(MINTER_ROLE) {
 if (totalSupply() + amount > MAX_SUPPLY) {
 revert MaxSupplyExceeded(amount, MAX_SUPPLY - totalSupply());
 }
 _mint(to, amount);
 }

 function pause() external onlyRole(PAUSER_ROLE) {
 _pause();
 }

 function unpause() external onlyRole(PAUSER_ROLE) {
 _unpause();
 }

 function _update(
 address from,
 address to,
 uint256 value
 ) internal override whenNotPaused {
 super._update(from, to, value);
 }
}

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