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/*-
* ============LICENSE_START=======================================================
* SDC
* ================================================================================
* Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* 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.
* ============LICENSE_END=========================================================
*/
package org.openecomp.sdc.notification.websocket;
import com.google.gson.Gson;
import java.io.IOException;
import java.util.Objects;
import java.util.Optional;
import java.util.UUID;
import java.util.function.Consumer;
import org.openecomp.sdc.logging.api.Logger;
import org.openecomp.sdc.logging.api.LoggerFactory;
import org.openecomp.sdc.notification.types.NotificationsStatusDto;
import org.openecomp.sdc.notification.workers.NotificationWorker;
import org.springframework.http.HttpHeaders;
import org.springframework.web.socket.CloseStatus;
import org.springframework.web.socket.TextMessage;
import org.springframework.web.socket.WebSocketSession;
import org.springframework.web.socket.handler.TextWebSocketHandler;
public class NotificationWebsocketHandler extends TextWebSocketHandler {
private static final String USER_ID_HEADER_PARAM = "USER_ID";
private static final String LAST_DELIVERED_QUERY_PARAM = "LAST_DELIVERED_EVENT_ID";
private static final String COOKIE = "Cookie";
private static Logger LOGGER = LoggerFactory.getLogger(NotificationWebsocketHandler.class);
private NotificationWorker worker;
public NotificationWebsocketHandler(NotificationWorker worker) {
super();
this.worker = Objects.requireNonNull(worker, "NotificationWorker object is not initialized.");
}
@Override
public void afterConnectionEstablished(WebSocketSession session) throws Exception {
super.afterConnectionEstablished(session);
String ownerId = getOwnerId(session);
if (ownerId == null) {
return;
}
UUID lastDelivered = getLastEventId(session);
Consumer<NotificationsStatusDto> notesProcessor = (notes) -> notifyReceiver(session, notes);
worker.register(ownerId, lastDelivered, notesProcessor);
}
@Override
public void afterConnectionClosed(WebSocketSession session, CloseStatus status) throws Exception {
String ownerId = getOwnerId(session);
if (ownerId != null) {
worker.unregister(ownerId);
}
super.afterConnectionClosed(session, status);
}
private void notifyReceiver(WebSocketSession session, NotificationsStatusDto notificationsStatusDto) {
try {
session.sendMessage(new TextMessage(new Gson().toJson(notificationsStatusDto)));
} catch (IOException e) {
LOGGER.error("IO Exception during Receiver notification.", e);
}
}
private String getOwnerId(WebSocketSession session) {
HttpHeaders handshakeHeaders = session.getHandshakeHeaders();
if (handshakeHeaders.containsKey(COOKIE)) {
String[] cookies = handshakeHeaders.get(COOKIE).get(0).split("; ");
Optional<String> cookie = extractValue(cookies, USER_ID_HEADER_PARAM);
if (cookie.isPresent()) {
return cookie.get();
}
}
LOGGER.error("No " + USER_ID_HEADER_PARAM + " specified in the session cookies.");
return null;
}
private UUID getLastEventId(WebSocketSession session) {
String uriQuery = session.getUri().getQuery();
if (uriQuery != null) {
String[] queries = uriQuery.split("; ");
Optional<String> paramValue = extractValue(queries, LAST_DELIVERED_QUERY_PARAM);
if (paramValue.isPresent()) {
return UUID.fromString(paramValue.get());
}
}
LOGGER.warn("No " + LAST_DELIVERED_QUERY_PARAM + " specified in the request URI.");
return null;
}
private Optional<String> extractValue(String[] pairs, String name) {
for (String nameValuePair : pairs) {
String[] value = nameValuePair.split("=");
if (value[0].equals(name)) {
return Optional.of(value[1]);
}
}
return Optional.empty();
}
}
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