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/**
 * This file is part of Graylog.
 *
 * Graylog 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.
 *
 * Graylog 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 Graylog.  If not, see .
 */
package org.graylog2.rest;

import org.graylog2.shared.security.ShiroPrincipal;
import org.graylog2.shared.security.ShiroSecurityContext;

import javax.annotation.Nullable;
import javax.ws.rs.container.ContainerRequestContext;
import javax.ws.rs.core.SecurityContext;
import java.security.Principal;

public class RestTools {
    @Nullable
    public static String getUserNameFromRequest(ContainerRequestContext requestContext) {
        final SecurityContext securityContext = requestContext.getSecurityContext();

        if (!(securityContext instanceof ShiroSecurityContext)) {
            return null;
        }

        final ShiroSecurityContext shiroSecurityContext = (ShiroSecurityContext) securityContext;
        final Principal userPrincipal = shiroSecurityContext.getUserPrincipal();

        if (!(userPrincipal instanceof ShiroPrincipal)) {
            return null;
        }

        final ShiroPrincipal shiroPrincipal = (ShiroPrincipal) userPrincipal;

        return shiroPrincipal.getName();
    }
}