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// Allow minters to add more tokens to the contract function mint(address to, uint256 amount) public onlyRole(MINTER_ROLE) { _mint(to, amount); }

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.7.0 <0.9.0;

// import "../node_modules/@openzeppelin/contracts/access/Ownable.sol"; import "../node_modules/@openzeppelin/contracts/access/AccessControl.sol"; import "../node_modules/@openzeppelin/contracts/token/ERC20/presets/ERC20PresetFixedSupply.sol";

contract KmutnbToken is ERC20PresetFixedSupply, AccessControl { bytes32 public constant MINTER_ROLE = keccak256("MINTER_ROLE");

constructor(
    address owner
)
    ERC20PresetFixedSupply(
        "KING MONGKUT'S UNIVERSITY OF TECHNOLOGY NORTH BANGKOK.",
        "KMUTNB",
        30000000 * 10 ** 18,
        owner
    )
{
    _grantRole(DEFAULT_ADMIN_ROLE, owner);
    _grantRole(MINTER_ROLE, owner);
    //_setupRole(DEFAULT_ADMIN_ROLE, owner);
    //_setupRole(MINTER_ROLE, owner);
}

// Allow minters to add more tokens to the contract
function mint(address to, uint256 amount) public onlyRole(MINTER_ROLE) {
    _mint(to, amount);
}

// Allow the owner to add minters
function addMinter(address minter) public onlyRole(DEFAULT_ADMIN_ROLE) {
    grantRole(MINTER_ROLE, minter);
}

}

--openssl-legacy-provider

truffle migrate --reset --network klaytn