Ivanmegacoin.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.10;

import "@openzeppelin/contracts@4.3.3/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts@4.3.3/token/ERC20/extensions/ERC20Burnable.sol";
import "@openzeppelin/contracts@4.3.3/token/ERC20/extensions/ERC20Snapshot.sol";
import "@openzeppelin/contracts@4.3.3/access/AccessControl.sol";
import "@openzeppelin/contracts@4.3.3/security/Pausable.sol";
import "@openzeppelin/contracts@4.3.3/token/ERC20/extensions/draft-ERC20Permit.sol";
import "@openzeppelin/contracts@4.3.3/token/ERC20/extensions/ERC20Votes.sol";
import "@openzeppelin/contracts@4.3.3/token/ERC20/extensions/ERC20FlashMint.sol";

/// @custom:security-contact toivan777@ya.ru
contract IvanMegacoin is ERC20, ERC20Burnable, ERC20Snapshot, AccessControl, Pausable, ERC20Permit, ERC20Votes, ERC20FlashMint {
    bytes32 public constant SNAPSHOT_ROLE = keccak256("SNAPSHOT_ROLE");
    bytes32 public constant PAUSER_ROLE = keccak256("PAUSER_ROLE");
    bytes32 public constant MINTER_ROLE = keccak256("MINTER_ROLE");

    constructor() ERC20("Ivan Megacoin", "IMGC") ERC20Permit("Ivan Megacoin") {
        _setupRole(DEFAULT_ADMIN_ROLE, msg.sender);
        _setupRole(SNAPSHOT_ROLE, msg.sender);
        _setupRole(PAUSER_ROLE, msg.sender);
        _mint(msg.sender, 100000000 * 10 ** decimals());
        _setupRole(MINTER_ROLE, msg.sender);
    }

    function snapshot() public onlyRole(SNAPSHOT_ROLE) {
        _snapshot();
    }

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

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

    function mint(address to, uint256 amount) public onlyRole(MINTER_ROLE) {
        _mint(to, amount);
    }

    function _beforeTokenTransfer(address from, address to, uint256 amount)
        internal
        whenNotPaused
        override(ERC20, ERC20Snapshot)
    {
        super._beforeTokenTransfer(from, to, amount);
    }

    // The following functions are overrides required by Solidity.

    function _afterTokenTransfer(address from, address to, uint256 amount)
        internal
        override(ERC20, ERC20Votes)
    {
        super._afterTokenTransfer(from, to, amount);
    }

    function _mint(address to, uint256 amount)
        internal
        override(ERC20, ERC20Votes)
    {
        super._mint(to, amount);
    }

    function _burn(address account, uint256 amount)
        internal
        override(ERC20, ERC20Votes)
    {
        super._burn(account, amount);
    }
}