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+/*
+ * Copyright (C) 2008-2020, 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;
+
+import com.juick.model.Message;
+import com.juick.model.User;
+import com.juick.model.AnonymousUser;
+import com.juick.www.api.SystemActivity;
+import com.juick.service.MessagesService;
+import com.juick.service.SubscriptionService;
+import com.juick.service.UserService;
+import com.juick.service.component.*;
+import com.juick.util.MessageUtils;
+import org.apache.commons.collections4.ListUtils;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.scheduling.annotation.Scheduled;
+import org.springframework.web.servlet.mvc.method.annotation.SseEmitter;
+
+import javax.annotation.Nonnull;
+import javax.annotation.PostConstruct;
+import javax.inject.Inject;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+import java.util.concurrent.CopyOnWriteArrayList;
+import java.util.stream.Collectors;
+
+/**
+ * @author Ugnich Anton
+ */
+public class ServerManager implements NotificationListener {
+ private static final Logger logger = LoggerFactory.getLogger("Session");
+
+ @Inject
+ private MessagesService messagesService;
+ @Inject
+ private SubscriptionService subscriptionService;
+ @Inject
+ private UserService userService;
+ private final CopyOnWriteArrayList<EventSession> sessions = new CopyOnWriteArrayList<>();
+
+ @Value("${service_user:juick}")
+ private String serviceUsername;
+
+ private User serviceUser;
+
+ @PostConstruct
+ public void init() {
+ serviceUser = userService.getUserByName(serviceUsername);
+ }
+
+
+ private void onJuickPM(final User to, final Message jmsg) {
+ messageEvent(jmsg, Arrays.asList(to, jmsg.getUser()));
+ }
+
+ private void onJuickMessagePost(final Message jmsg, List<User> subscribedUsers) {
+ messageEvent(jmsg, subscribedUsers);
+ messageEvent(jmsg, Collections.singletonList(AnonymousUser.INSTANCE));
+ }
+
+ private void onJuickMessageReply(final Message jmsg, final List<User> subscribedUsers) {
+ messageEvent(jmsg, subscribedUsers);
+ messageEvent(jmsg, Collections.singletonList(AnonymousUser.INSTANCE));
+ }
+
+ @Override
+ public void processSystemEvent(@Nonnull SystemEvent systemEvent) {
+ var activity = systemEvent.getActivity();
+ var from = activity.getFrom();
+ var message = activity.getMessage();
+ var subscribers = activity.getTo();
+ if (activity.getType().equals(SystemActivity.ActivityType.message)) {
+ processMessage(from, message, subscribers);
+ } else if (activity.getType().equals(SystemActivity.ActivityType.like)) {
+ if (from.equals(serviceUser)) {
+ processTop(message);
+ }
+ }
+ }
+ private void processMessage(User from, Message jmsg, List<User> subscribers) {
+ List<User> subscribedUsers = ListUtils.union(subscribers, Collections.singletonList(jmsg.getUser()));
+ if (jmsg.isService()) {
+ logger.info("Message read event from {} for {}", from.getUid(), jmsg.getMid());
+ readEvent(jmsg, Collections.singletonList(serviceUser));
+ return;
+ }
+ if (MessageUtils.isPM(jmsg)) {
+ onJuickPM(jmsg.getTo(), jmsg);
+ } else if (!MessageUtils.isReply(jmsg)) {
+ onJuickMessagePost(jmsg, subscribedUsers);
+ } else {
+ // to get quote and attachment
+ Message op = messagesService.getMessage(jmsg.getMid()).orElseThrow(IllegalStateException::new);
+ subscriptionService.getUsersSubscribedToComments(op, jmsg, true).stream()
+ .filter(u -> userService.isReplyToBL(u, jmsg))
+ .forEach(b -> messagesService.setLastReadComment(b, jmsg.getMid(), jmsg.getRid()));
+ onJuickMessageReply(jmsg, subscribedUsers);
+ }
+ messageEvent(jmsg, Collections.singletonList(serviceUser));
+ }
+
+ @Override
+ public void processPingEvent(PingEvent pingEvent) {
+
+ }
+
+ private void processTop(Message msg) {
+ User topUser = msg.getUser();
+ topEvent(msg, Arrays.asList(topUser, serviceUser));
+ }
+ private void topEvent(Message msg, List<User> subscribers){
+ sendSseEvent(msg, "top", subscribers);
+ }
+
+ private void readEvent(Message msg, List<User> subscribers){
+ sendSseEvent(msg, "read", subscribers);
+ }
+
+ private void messageEvent(Message msg, List<User> subscribers) {
+ sendSseEvent(msg, "msg", subscribers);
+ }
+
+ private void sendSseEvent(Message msg, String name, List<User> subscribers) {
+ List<EventSession> deadEmitters = new ArrayList<>();
+ this.sessions.stream().filter(s -> subscribers.contains(s.user)).forEach(session -> {
+ try {
+ SseEmitter.SseEventBuilder builder = SseEmitter.event()
+ .name(name)
+ .data(msg);
+ session.getEmitter().send(builder);
+ } catch (Exception e) {
+ deadEmitters.add(session);
+ }
+ });
+ this.sessions.removeAll(deadEmitters);
+ }
+
+ public static class EventSession {
+ private final User user;
+ private final SseEmitter emitter;
+
+ public EventSession(User user, SseEmitter sseEmitter) {
+ this.user = user;
+ this.emitter = sseEmitter;
+ }
+
+ public User getUser() {
+ return user;
+ }
+
+ public SseEmitter getEmitter() {
+ return emitter;
+ }
+ }
+
+ public CopyOnWriteArrayList<EventSession> getSessions() {
+ return sessions;
+ }
+ @Scheduled(fixedRate = 30000)
+ public void ping() {
+ Message ping = new Message();
+ ping.setService(true);
+ sendSseEvent(ping, "ping", getSessions().stream().map(s -> s.user)
+ .distinct().collect(Collectors.toList()));
+ }
+}