git.basschouten.com Git - openhab-addons.git/blob

   1 /**
   2  * Copyright (c) 2010-2023 Contributors to the openHAB project
   3  *
   4  * See the NOTICE file(s) distributed with this work for additional
   5  * information.
   6  *
   7  * This program and the accompanying materials are made available under the
   8  * terms of the Eclipse Public License 2.0 which is available at
   9  * http://www.eclipse.org/legal/epl-2.0
  10  *
  11  * SPDX-License-Identifier: EPL-2.0
  12  */
  13 package org.openhab.binding.ipcamera.internal.servlet;
  14
  15 import java.io.BufferedInputStream;
  16 import java.io.BufferedOutputStream;
  17 import java.io.File;
  18 import java.io.FileInputStream;
  19 import java.io.IOException;
  20
  21 import javax.servlet.ServletOutputStream;
  22 import javax.servlet.annotation.WebServlet;
  23 import javax.servlet.http.HttpServlet;
  24 import javax.servlet.http.HttpServletResponse;
  25
  26 import org.eclipse.jdt.annotation.NonNullByDefault;
  27 import org.openhab.core.thing.binding.ThingHandler;
  28 import org.osgi.service.http.HttpService;
  29 import org.slf4j.Logger;
  30 import org.slf4j.LoggerFactory;
  31
  32 /**
  33  * The {@link IpCameraServlet} is responsible for serving files to the Jetty
  34  * server normally found on port 8080
  35  *
  36  * @author Matthew Skinner - Initial contribution
  37  */
  38 @NonNullByDefault
  39 @WebServlet(asyncSupported = true)
  40 public abstract class IpCameraServlet extends HttpServlet {
  41     protected final Logger logger = LoggerFactory.getLogger(this.getClass());
  42     private static final long serialVersionUID = 1L;
  43     protected final ThingHandler handler;
  44     protected final HttpService httpService;
  45
  46     public IpCameraServlet(ThingHandler handler, HttpService httpService) {
  47         this.handler = handler;
  48         this.httpService = httpService;
  49         startListening();
  50     }
  51
  52     public void startListening() {
  53         try {
  54             httpService.registerServlet("/ipcamera/" + handler.getThing().getUID().getId(), this, null,
  55                     httpService.createDefaultHttpContext());
  56         } catch (Exception e) {
  57             logger.warn("Registering servlet failed:{}", e.getMessage());
  58         }
  59     }
  60
  61     protected void sendSnapshotImage(HttpServletResponse response, String contentType, byte[] snapshot) {
  62         response.setHeader("Access-Control-Allow-Origin", "*");
  63         response.setHeader("Access-Control-Expose-Headers", "*");
  64         response.setContentType(contentType);
  65         if (snapshot.length == 1) {
  66             logger.warn("ipcamera.jpg was requested but there was no jpg in ram to send.");
  67             return;
  68         }
  69         try {
  70             response.setContentLength(snapshot.length);
  71             ServletOutputStream servletOut = response.getOutputStream();
  72             servletOut.write(snapshot);
  73         } catch (IOException e) {
  74         }
  75     }
  76
  77     protected void sendString(HttpServletResponse response, String contents, String contentType) {
  78         response.setHeader("Access-Control-Allow-Origin", "*");
  79         response.setHeader("Access-Control-Expose-Headers", "*");
  80         response.setContentType(contentType);
  81         response.setHeader("Pragma", "no-cache");
  82         response.setHeader("Cache-Control", "max-age=0, no-cache, no-store");
  83         byte[] bytes = contents.getBytes();
  84         try {
  85             response.setContentLength(bytes.length);
  86             ServletOutputStream servletOut = response.getOutputStream();
  87             servletOut.write(bytes);
  88             servletOut.write("\r\n".getBytes());
  89         } catch (IOException e) {
  90         }
  91     }
  92
  93     protected void sendFile(HttpServletResponse response, String filename, String contentType) throws IOException {
  94         File file = new File(filename);
  95         if (!file.exists()) {
  96             response.sendError(HttpServletResponse.SC_NOT_FOUND);
  97             return;
  98         }
  99         response.setBufferSize((int) file.length());
 100         response.setContentType(contentType);
 101         response.setHeader("Access-Control-Allow-Origin", "*");
 102         response.setHeader("Access-Control-Expose-Headers", "*");
 103         response.setHeader("Content-Length", String.valueOf(file.length()));
 104         response.setHeader("Pragma", "no-cache");
 105         response.setHeader("Cache-Control", "max-age=0, no-cache, no-store");
 106         BufferedInputStream input = null;
 107         BufferedOutputStream output = null;
 108         try {
 109             input = new BufferedInputStream(new FileInputStream(file), (int) file.length());
 110             output = new BufferedOutputStream(response.getOutputStream(), (int) file.length());
 111             byte[] buffer = new byte[(int) file.length()];
 112             int length;
 113             while ((length = input.read(buffer)) > 0) {
 114                 output.write(buffer, 0, length);
 115             }
 116         } finally {
 117             if (output != null) {
 118                 output.close();
 119             }
 120             if (input != null) {
 121                 input.close();
 122             }
 123         }
 124     }
 125
 126     public void dispose() {
 127         try {
 128             httpService.unregister("/ipcamera/" + handler.getThing().getUID().getId());
 129             this.destroy();
 130         } catch (IllegalArgumentException e) {
 131             logger.warn("Unregistration of servlet failed:{}", e.getMessage());
 132         }
 133     }
 134 }