org.ngrinder.infra.spring.UserHandlerMethodArgumentResolver.java Source code

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Here is the source code for org.ngrinder.infra.spring.UserHandlerMethodArgumentResolver.java

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/* 
 * Licensed 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 org.ngrinder.infra.spring;

import javax.servlet.http.Cookie;

import org.apache.commons.lang.StringUtils;
import org.ngrinder.model.Permission;
import org.ngrinder.model.User;
import org.ngrinder.user.service.UserContext;
import org.ngrinder.user.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.MethodParameter;
import org.springframework.web.bind.support.WebDataBinderFactory;
import org.springframework.web.context.request.NativeWebRequest;
import org.springframework.web.context.request.ServletWebRequest;
import org.springframework.web.method.support.HandlerMethodArgumentResolver;
import org.springframework.web.method.support.ModelAndViewContainer;

/**
 * {@link HandlerMethodArgumentResolver} for {@link User} argument.
 * 
 * It passes the current user instance on {@link User} argument.
 * 
 * @author JunHo Yoon
 * @since 3.0
 */
public class UserHandlerMethodArgumentResolver implements HandlerMethodArgumentResolver {

    private UserContext userContext;

    @Autowired
    private UserService userService;

    /*
     * (non-Javadoc)
     * 
     * @see
     * org.springframework.web.method.support.HandlerMethodArgumentResolver#
     * supportsParameter(org .springframework.core.MethodParameter)
     */
    @Override
    public boolean supportsParameter(MethodParameter parameter) {
        return parameter.getParameterIndex() == 0 && parameter.getParameterType().equals(User.class);
    }

    /*
     * (non-Javadoc)
     * 
     * @see
     * org.springframework.web.method.support.HandlerMethodArgumentResolver#
     * resolveArgument(org. springframework.core.MethodParameter,
     * org.springframework.web.method.support.ModelAndViewContainer,
     * org.springframework.web.context.request.NativeWebRequest,
     * org.springframework.web.bind.support.WebDataBinderFactory)
     */
    @Override
    public Object resolveArgument(MethodParameter parameter, ModelAndViewContainer mavContainer,
            NativeWebRequest webRequest, WebDataBinderFactory binderFactory) throws Exception {
        User currentUser = getUserContext().getCurrentUser();

        String userParam = webRequest.getParameter("ownerId");
        if (StringUtils.isNotBlank(userParam) && currentUser.getRole().hasPermission(Permission.SWITCH_TO_ANYONE)) {
            return getUserService().getOne(userParam);
        }

        // User want to do something through other User status and this
        // switchUser is other user Id
        String switchUser = null;
        Cookie[] cookies = getCookies(webRequest);
        if (cookies != null) {
            for (Cookie cookie : cookies) {
                if ("switchUser".equals(cookie.getName()) && cookie.getMaxAge() != 0) {
                    switchUser = cookie.getValue();
                }
            }
        }
        // Let this can be done with parameter as well.
        switchUser = StringUtils.defaultIfBlank(webRequest.getParameter("switchUser"), switchUser);

        if (currentUser.getUserId().equals(switchUser)) {
            currentUser.setOwnerUser(null);
        } else if (StringUtils.isNotEmpty(switchUser)) {
            User ownerUser = getUserService().getOne(switchUser);
            // CurrentUser should remember whose status he used
            if (currentUser.getRole().hasPermission(Permission.SWITCH_TO_ANYONE)
                    || (ownerUser.getFollowers() != null && ownerUser.getFollowers().contains(currentUser))) {
                currentUser.setOwnerUser(ownerUser);
                return ownerUser;
            }
        } else if (StringUtils.isEmpty(switchUser)) {
            currentUser.setOwnerUser(null);
        }

        return currentUser.getFactualUser();
    }

    Cookie[] getCookies(NativeWebRequest webRequest) {
        return ((ServletWebRequest) webRequest).getRequest().getCookies();
    }

    /**
     * Get current user context.<br/>
     * This method is provided for XML based spring bean injection.
     * 
     * @return user context
     */
    public UserContext getUserContext() {
        return userContext;
    }

    /**
     * Set the current user context.<br/>
     * This method is provided for XML based spring bean injection.
     * 
     * @param userContext
     *            user context.
     */
    public void setUserContext(UserContext userContext) {
        this.userContext = userContext;
    }

    public UserService getUserService() {
        return userService;
    }

    public void setUserService(UserService userService) {
        this.userService = userService;
    }
}