/*
 * Copyright (C) 2008-2017, Juick
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package com.juick.server.util;

import com.juick.User;
import com.juick.server.helpers.AnonymousUser;
import com.juick.service.security.entities.JuickUser;
import javax.annotation.Nonnull;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.context.SecurityContextHolder;

/**
 * Created by aalexeev on 11/14/16.
 */
public class UserUtils {
    private UserUtils() {
        throw new IllegalStateException();
    }

    public static Authentication getAuthentication() {
        return SecurityContextHolder.getContext().getAuthentication();
    }

    public static Object getPrincipal(final Authentication authentication) {
        return authentication == null ? null : authentication.getPrincipal();
    }

    @Nonnull
    public static User getCurrentUser() {
        Object principal = getPrincipal(getAuthentication());

        if (principal instanceof JuickUser)
            return ((JuickUser) principal).getUser();

        if (principal instanceof User)
            return (User) principal;

        return AnonymousUser.INSTANCE;
    }
}