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[websocket] Allow registering websocket adapters (openhab#3622)
* [WebSocket] Allow register websocket handlers Signed-off-by: Miguel Álvarez <miguelwork92@gmail.com>
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136
...core.io.websocket/src/main/java/org/openhab/core/io/websocket/CommonWebSocketServlet.java
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| /** | ||
| * Copyright (c) 2010-2023 Contributors to the openHAB project | ||
| * | ||
| * See the NOTICE file(s) distributed with this work for additional | ||
| * information. | ||
| * | ||
| * This program and the accompanying materials are made available under the | ||
| * terms of the Eclipse Public License 2.0 which is available at | ||
| * http://www.eclipse.org/legal/epl-2.0 | ||
| * | ||
| * SPDX-License-Identifier: EPL-2.0 | ||
| */ | ||
| package org.openhab.core.io.websocket; | ||
|
|
||
| import java.io.IOException; | ||
| import java.util.HashMap; | ||
| import java.util.Map; | ||
|
|
||
| import javax.servlet.Servlet; | ||
| import javax.servlet.ServletException; | ||
|
|
||
| import org.eclipse.jdt.annotation.NonNullByDefault; | ||
| import org.eclipse.jdt.annotation.Nullable; | ||
| import org.eclipse.jetty.websocket.server.WebSocketServerFactory; | ||
| import org.eclipse.jetty.websocket.servlet.ServletUpgradeRequest; | ||
| import org.eclipse.jetty.websocket.servlet.ServletUpgradeResponse; | ||
| import org.eclipse.jetty.websocket.servlet.WebSocketCreator; | ||
| import org.eclipse.jetty.websocket.servlet.WebSocketServlet; | ||
| import org.eclipse.jetty.websocket.servlet.WebSocketServletFactory; | ||
| import org.openhab.core.auth.AuthenticationException; | ||
| import org.openhab.core.auth.Role; | ||
| import org.openhab.core.io.rest.auth.AuthFilter; | ||
| import org.osgi.service.component.annotations.Activate; | ||
| import org.osgi.service.component.annotations.Component; | ||
| import org.osgi.service.component.annotations.Reference; | ||
| import org.osgi.service.component.annotations.ReferenceCardinality; | ||
| import org.osgi.service.component.annotations.ReferencePolicy; | ||
| import org.osgi.service.http.NamespaceException; | ||
| import org.osgi.service.http.whiteboard.propertytypes.HttpWhiteboardServletName; | ||
| import org.osgi.service.http.whiteboard.propertytypes.HttpWhiteboardServletPattern; | ||
| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
|
|
||
| /** | ||
| * The {@link CommonWebSocketServlet} provides the servlet for WebSocket connections | ||
| * | ||
| * @author Jan N. Klug - Initial contribution | ||
| * @author Miguel Álvarez Díez - Refactor into a common servlet | ||
| */ | ||
| @NonNullByDefault | ||
| @HttpWhiteboardServletName(CommonWebSocketServlet.SERVLET_PATH) | ||
| @HttpWhiteboardServletPattern(CommonWebSocketServlet.SERVLET_PATH + "/*") | ||
| @Component(immediate = true, service = { Servlet.class }) | ||
| public class CommonWebSocketServlet extends WebSocketServlet { | ||
| private static final long serialVersionUID = 1L; | ||
|
|
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| public static final String SERVLET_PATH = "/ws"; | ||
|
|
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| public static final String DEFAULT_ADAPTER_ID = EventWebSocketAdapter.ADAPTER_ID; | ||
|
|
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| private final Map<String, WebSocketAdapter> connectionHandlers = new HashMap<>(); | ||
| private final AuthFilter authFilter; | ||
|
|
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| @SuppressWarnings("unused") | ||
| private @Nullable WebSocketServerFactory importNeeded; | ||
|
|
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| @Activate | ||
| public CommonWebSocketServlet(@Reference AuthFilter authFilter) throws ServletException, NamespaceException { | ||
| this.authFilter = authFilter; | ||
| } | ||
|
|
||
| @Override | ||
| public void configure(@NonNullByDefault({}) WebSocketServletFactory webSocketServletFactory) { | ||
| webSocketServletFactory.getPolicy().setIdleTimeout(10000); | ||
| webSocketServletFactory.setCreator(new CommonWebSocketCreator()); | ||
| } | ||
|
|
||
| @Reference(cardinality = ReferenceCardinality.MULTIPLE, policy = ReferencePolicy.DYNAMIC) | ||
| protected void addWebSocketAdapter(WebSocketAdapter wsAdapter) { | ||
| this.connectionHandlers.put(wsAdapter.getId(), wsAdapter); | ||
| } | ||
|
|
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| protected void removeWebSocketAdapter(WebSocketAdapter wsAdapter) { | ||
| this.connectionHandlers.remove(wsAdapter.getId()); | ||
| } | ||
|
|
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| private class CommonWebSocketCreator implements WebSocketCreator { | ||
| private final Logger logger = LoggerFactory.getLogger(CommonWebSocketCreator.class); | ||
|
|
||
| @Override | ||
| public @Nullable Object createWebSocket(@Nullable ServletUpgradeRequest servletUpgradeRequest, | ||
| @Nullable ServletUpgradeResponse servletUpgradeResponse) { | ||
| if (servletUpgradeRequest == null || servletUpgradeResponse == null) { | ||
| return null; | ||
| } | ||
| if (isAuthorizedRequest(servletUpgradeRequest)) { | ||
| String requestPath = servletUpgradeRequest.getRequestURI().getPath(); | ||
| String pathPrefix = SERVLET_PATH + "/"; | ||
| boolean useDefaultAdapter = requestPath.equals(pathPrefix) || !requestPath.startsWith(pathPrefix); | ||
| WebSocketAdapter wsAdapter; | ||
| if (!useDefaultAdapter) { | ||
| String adapterId = requestPath.substring(pathPrefix.length()); | ||
| wsAdapter = connectionHandlers.get(adapterId); | ||
| if (wsAdapter == null) { | ||
| logger.warn("Missing WebSocket adapter for path {}", adapterId); | ||
| return null; | ||
| } | ||
| } else { | ||
| wsAdapter = connectionHandlers.get(DEFAULT_ADAPTER_ID); | ||
| if (wsAdapter == null) { | ||
| logger.warn("Default WebSocket adapter is missing"); | ||
| return null; | ||
| } | ||
| } | ||
| logger.debug("New connection handled by {}", wsAdapter.getId()); | ||
| return wsAdapter.createWebSocket(servletUpgradeRequest, servletUpgradeResponse); | ||
| } else { | ||
| logger.warn("Unauthenticated request to create a websocket from {}.", | ||
| servletUpgradeRequest.getRemoteAddress()); | ||
| } | ||
| return null; | ||
| } | ||
|
|
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| private boolean isAuthorizedRequest(ServletUpgradeRequest servletUpgradeRequest) { | ||
| try { | ||
| var securityContext = authFilter.getSecurityContext(servletUpgradeRequest.getHttpServletRequest(), | ||
| true); | ||
| return securityContext != null | ||
| && (securityContext.isUserInRole(Role.USER) || securityContext.isUserInRole(Role.ADMIN)); | ||
| } catch (AuthenticationException | IOException e) { | ||
| logger.warn("Error handling WebSocket authorization", e); | ||
| return false; | ||
| } | ||
| } | ||
| } | ||
| } |
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