/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package Dlib.web;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;
import Dlib.Models.User;
import Dlib.Services.UserService;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * A Spring MVC interceptor that adds the currentUser into the request as a request attribute
 * before the JSP is rendered.  This operation is assumed to be fast because the User should be
 * cached in the Hibernate second-level cache.
 */
@Component
public class CurrentUserInterceptor extends HandlerInterceptorAdapter {
    @Autowired
    private UserService userService;

    @Override
    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {
        // Add the current user into the request
        User currentUser = userService.getCurrentUser();
        if( currentUser != null ) {
            httpServletRequest.setAttribute( "currentUser", currentUser );
        }
    }
}
