// SPDX-License-Identifier: GPL-3.0-or-later
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

pragma solidity >=0.7.0 <0.9.0;

/**
 * @dev Interface for the OptionalOnlyCaller helper, used to opt in to a caller
 * verification for a given address to methods that are otherwise callable by any address.
 */
interface IOptionalOnlyCaller {
    /**
     * @dev Emitted every time setOnlyCallerCheck is called.
     */
    event OnlyCallerOptIn(address user, bool enabled);

    /**
     * @dev Enables / disables verification mechanism for caller.
     * @param enabled - True if caller verification shall be enabled, false otherwise.
     */
    function setOnlyCallerCheck(bool enabled) external;

    function setOnlyCallerCheckWithSignature(
        address user,
        bool enabled,
        bytes memory signature
    ) external;

    /**
     * @dev Returns true if caller verification is enabled for the given user, false otherwise.
     */
    function isOnlyCallerEnabled(address user) external view returns (bool);
}