pragma solidity 0.5.17;

import "../openzeppelin/Ownable.sol";

contract AdminRole is Ownable {
	/// @dev user => flag whether user has admin role.
	mapping(address => bool) public admins;

	event AdminAdded(address admin);
	event AdminRemoved(address admin);

	/**
	 * @dev Throws if called by any account other than the owner or admin.
	 * or on our own overriding sovrynOwnable.
	 */
	modifier onlyAuthorized() {
		require(isOwner() || admins[msg.sender], "unauthorized");
		_;
	}

	/**
	 * @notice Add account to ACL.
	 * @param _admin The addresses of the account to grant permissions.
	 * */
	function addAdmin(address _admin) public onlyOwner {
		admins[_admin] = true;
		emit AdminAdded(_admin);
	}

	/**
	 * @notice Remove account from ACL.
	 * @param _admin The addresses of the account to revoke permissions.
	 * */
	function removeAdmin(address _admin) public onlyOwner {
		admins[_admin] = false;
		emit AdminRemoved(_admin);
	}
}