/*
* Symphony - A modern community (forum/SNS/blog) platform written in Java.
* Copyright (C) 2012-2017, b3log.org & hacpai.com
*
* 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/>.
*/
package org.b3log.symphony.processor;
import org.b3log.latke.Keys;
import org.b3log.latke.ioc.inject.Inject;
import org.b3log.latke.logging.Logger;
import org.b3log.latke.model.User;
import org.b3log.latke.servlet.HTTPRequestContext;
import org.b3log.latke.servlet.HTTPRequestMethod;
import org.b3log.latke.servlet.annotation.Before;
import org.b3log.latke.servlet.annotation.RequestProcessing;
import org.b3log.latke.servlet.annotation.RequestProcessor;
import org.b3log.latke.util.Requests;
import org.b3log.symphony.model.Article;
import org.b3log.symphony.model.Follow;
import org.b3log.symphony.model.Notification;
import org.b3log.symphony.processor.advice.LoginCheck;
import org.b3log.symphony.processor.advice.PermissionCheck;
import org.b3log.symphony.service.ArticleQueryService;
import org.b3log.symphony.service.FollowMgmtService;
import org.b3log.symphony.service.NotificationMgmtService;
import org.json.JSONObject;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.HashSet;
import java.util.Set;
/**
* Follow processor.
* <p>
* <ul>
* <li>Follows a user (/follow/user), POST</li>
* <li>Unfollows a user (/follow/user), DELETE</li>
* <li>Follows a tag (/follow/tag), POST</li>
* <li>Unfollows a tag (/follow/tag), DELETE</li>
* <li>Follows an article (/follow/article), POST</li>
* <li>Unfollows an article (/follow/article), DELETE</li>
* <li>Watches an article (/follow/article-watch), POST</li>
* <li>Unwatches an article (/follow/article-watch), DELETE</li>
* </ul>
* </p>
*
* @author <a href="http://88250.b3log.org">Liang Ding</a>
* @version 1.3.0.4, Mar 7, 2017
* @since 0.2.5
*/
@RequestProcessor
public class FollowProcessor {
/**
* Logger.
*/
private static final Logger LOGGER = Logger.getLogger(FollowProcessor.class.getName());
/**
* Holds follows.
*/
private static final Set<String> FOLLOWS = new HashSet<>();
/**
* Follow management service.
*/
@Inject
private FollowMgmtService followMgmtService;
/**
* Notification management service.
*/
@Inject
private NotificationMgmtService notificationMgmtService;
/**
* Article query service.
*/
@Inject
private ArticleQueryService articleQueryService;
/**
* Follows a user.
* <p>
* The request json object:
* <pre>
* {
* "followingId": ""
* }
* </pre>
* </p>
*
* @param context the specified context
* @param request the specified request
* @param response the specified response
* @throws Exception exception
*/
@RequestProcessing(value = "/follow/user", method = HTTPRequestMethod.POST)
@Before(adviceClass = LoginCheck.class)
public void followUser(final HTTPRequestContext context, final HttpServletRequest request,
final HttpServletResponse response) throws Exception {
context.renderJSON();
final JSONObject requestJSONObject = Requests.parseRequestJSONObject(request, context.getResponse());
final String followingUserId = requestJSONObject.optString(Follow.FOLLOWING_ID);
final JSONObject currentUser = (JSONObject) request.getAttribute(User.USER);
final String followerUserId = currentUser.optString(Keys.OBJECT_ID);
followMgmtService.followUser(followerUserId, followingUserId);
if (!FOLLOWS.contains(followingUserId + followerUserId)) {
final JSONObject notification = new JSONObject();
notification.put(Notification.NOTIFICATION_USER_ID, followingUserId);
notification.put(Notification.NOTIFICATION_DATA_ID, followerUserId);
notificationMgmtService.addNewFollowerNotification(notification);
}
FOLLOWS.add(followingUserId + followerUserId);
context.renderTrueResult();
}
/**
* Unfollows a user.
* <p>
* The request json object:
* <pre>
* {
* "followingId": ""
* }
* </pre>
* </p>
*
* @param context the specified context
* @param request the specified request
* @param response the specified response
* @throws Exception exception
*/
@RequestProcessing(value = "/follow/user", method = HTTPRequestMethod.DELETE)
@Before(adviceClass = LoginCheck.class)
public void unfollowUser(final HTTPRequestContext context, final HttpServletRequest request,
final HttpServletResponse response) throws Exception {
context.renderJSON();
final JSONObject requestJSONObject = Requests.parseRequestJSONObject(request, context.getResponse());
final String followingUserId = requestJSONObject.optString(Follow.FOLLOWING_ID);
final JSONObject currentUser = (JSONObject) request.getAttribute(User.USER);
final String followerUserId = currentUser.optString(Keys.OBJECT_ID);
followMgmtService.unfollowUser(followerUserId, followingUserId);
context.renderTrueResult();
}
/**
* Follows a tag.
* <p>
* The request json object:
* <pre>
* {
* "followingId": ""
* }
* </pre>
* </p>
*
* @param context the specified context
* @param request the specified request
* @param response the specified response
* @throws Exception exception
*/
@RequestProcessing(value = "/follow/tag", method = HTTPRequestMethod.POST)
@Before(adviceClass = LoginCheck.class)
public void followTag(final HTTPRequestContext context, final HttpServletRequest request,
final HttpServletResponse response) throws Exception {
context.renderJSON();
final JSONObject requestJSONObject = Requests.parseRequestJSONObject(request, context.getResponse());
final String followingTagId = requestJSONObject.optString(Follow.FOLLOWING_ID);
final JSONObject currentUser = (JSONObject) request.getAttribute(User.USER);
final String followerUserId = currentUser.optString(Keys.OBJECT_ID);
followMgmtService.followTag(followerUserId, followingTagId);
context.renderTrueResult();
}
/**
* Unfollows a tag.
* <p>
* The request json object:
* <pre>
* {
* "followingId": ""
* }
* </pre>
* </p>
*
* @param context the specified context
* @param request the specified request
* @param response the specified response
* @throws Exception exception
*/
@RequestProcessing(value = "/follow/tag", method = HTTPRequestMethod.DELETE)
@Before(adviceClass = LoginCheck.class)
public void unfollowTag(final HTTPRequestContext context, final HttpServletRequest request,
final HttpServletResponse response) throws Exception {
context.renderJSON();
final JSONObject requestJSONObject = Requests.parseRequestJSONObject(request, context.getResponse());
final String followingTagId = requestJSONObject.optString(Follow.FOLLOWING_ID);
final JSONObject currentUser = (JSONObject) request.getAttribute(User.USER);
final String followerUserId = currentUser.optString(Keys.OBJECT_ID);
followMgmtService.unfollowTag(followerUserId, followingTagId);
context.renderTrueResult();
}
/**
* Follows an article.
* <p>
* The request json object:
* <pre>
* {
* "followingId": ""
* }
* </pre>
* </p>
*
* @param context the specified context
* @param request the specified request
* @param response the specified response
* @throws Exception exception
*/
@RequestProcessing(value = "/follow/article", method = HTTPRequestMethod.POST)
@Before(adviceClass = {LoginCheck.class, PermissionCheck.class})
public void followArticle(final HTTPRequestContext context, final HttpServletRequest request,
final HttpServletResponse response) throws Exception {
context.renderJSON();
final JSONObject requestJSONObject = Requests.parseRequestJSONObject(request, context.getResponse());
final String followingArticleId = requestJSONObject.optString(Follow.FOLLOWING_ID);
final JSONObject currentUser = (JSONObject) request.getAttribute(User.USER);
final String followerUserId = currentUser.optString(Keys.OBJECT_ID);
followMgmtService.followArticle(followerUserId, followingArticleId);
final JSONObject article = articleQueryService.getArticle(followingArticleId);
final String articleAuthorId = article.optString(Article.ARTICLE_AUTHOR_ID);
if (!FOLLOWS.contains(articleAuthorId + followingArticleId + "-" + followerUserId) &&
!articleAuthorId.equals(followerUserId)) {
final JSONObject notification = new JSONObject();
notification.put(Notification.NOTIFICATION_USER_ID, articleAuthorId);
notification.put(Notification.NOTIFICATION_DATA_ID, followingArticleId + "-" + followerUserId);
notificationMgmtService.addArticleNewFollowerNotification(notification);
}
FOLLOWS.add(articleAuthorId + followingArticleId + "-" + followerUserId);
context.renderTrueResult();
}
/**
* Unfollows an article.
* <p>
* The request json object:
* <pre>
* {
* "followingId": ""
* }
* </pre>
* </p>
*
* @param context the specified context
* @param request the specified request
* @param response the specified response
* @throws Exception exception
*/
@RequestProcessing(value = "/follow/article", method = HTTPRequestMethod.DELETE)
@Before(adviceClass = LoginCheck.class)
public void unfollowArticle(final HTTPRequestContext context, final HttpServletRequest request,
final HttpServletResponse response) throws Exception {
context.renderJSON();
final JSONObject requestJSONObject = Requests.parseRequestJSONObject(request, context.getResponse());
final String followingArticleId = requestJSONObject.optString(Follow.FOLLOWING_ID);
final JSONObject currentUser = (JSONObject) request.getAttribute(User.USER);
final String followerUserId = currentUser.optString(Keys.OBJECT_ID);
followMgmtService.unfollowArticle(followerUserId, followingArticleId);
context.renderTrueResult();
}
/**
* Watches an article.
* <p>
* The request json object:
* <pre>
* {
* "followingId": ""
* }
* </pre>
* </p>
*
* @param context the specified context
* @param request the specified request
* @param response the specified response
* @throws Exception exception
*/
@RequestProcessing(value = "/follow/article-watch", method = HTTPRequestMethod.POST)
@Before(adviceClass = {LoginCheck.class, PermissionCheck.class})
public void watchArticle(final HTTPRequestContext context, final HttpServletRequest request,
final HttpServletResponse response) throws Exception {
context.renderJSON();
final JSONObject requestJSONObject = Requests.parseRequestJSONObject(request, context.getResponse());
final String followingArticleId = requestJSONObject.optString(Follow.FOLLOWING_ID);
final JSONObject currentUser = (JSONObject) request.getAttribute(User.USER);
final String followerUserId = currentUser.optString(Keys.OBJECT_ID);
followMgmtService.watchArticle(followerUserId, followingArticleId);
final JSONObject article = articleQueryService.getArticle(followingArticleId);
final String articleAuthorId = article.optString(Article.ARTICLE_AUTHOR_ID);
if (!FOLLOWS.contains(articleAuthorId + followingArticleId + "-" + followerUserId) &&
!articleAuthorId.equals(followerUserId)) {
final JSONObject notification = new JSONObject();
notification.put(Notification.NOTIFICATION_USER_ID, articleAuthorId);
notification.put(Notification.NOTIFICATION_DATA_ID, followingArticleId + "-" + followerUserId);
notificationMgmtService.addArticleNewWatcherNotification(notification);
}
FOLLOWS.add(articleAuthorId + followingArticleId + "-" + followerUserId);
context.renderTrueResult();
}
/**
* Unwatches an article.
* <p>
* The request json object:
* <pre>
* {
* "followingId": ""
* }
* </pre>
* </p>
*
* @param context the specified context
* @param request the specified request
* @param response the specified response
* @throws Exception exception
*/
@RequestProcessing(value = "/follow/article-watch", method = HTTPRequestMethod.DELETE)
@Before(adviceClass = LoginCheck.class)
public void unwatchArticle(final HTTPRequestContext context, final HttpServletRequest request,
final HttpServletResponse response) throws Exception {
context.renderJSON();
final JSONObject requestJSONObject = Requests.parseRequestJSONObject(request, context.getResponse());
final String followingArticleId = requestJSONObject.optString(Follow.FOLLOWING_ID);
final JSONObject currentUser = (JSONObject) request.getAttribute(User.USER);
final String followerUserId = currentUser.optString(Keys.OBJECT_ID);
followMgmtService.unwatchArticle(followerUserId, followingArticleId);
context.renderTrueResult();
}
}