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   1 /**
   2  * Copyright (c) 2010-2020 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.amazonechocontrol.internal;
  14
  15 import static org.openhab.binding.amazonechocontrol.internal.AmazonEchoControlBindingConstants.BINDING_NAME;
  16
  17 import java.io.IOException;
  18 import java.net.URLEncoder;
  19 import java.util.ArrayList;
  20 import java.util.List;
  21
  22 import javax.servlet.ServletException;
  23 import javax.servlet.http.HttpServlet;
  24 import javax.servlet.http.HttpServletRequest;
  25 import javax.servlet.http.HttpServletResponse;
  26
  27 import org.apache.commons.lang.StringEscapeUtils;
  28 import org.eclipse.jdt.annotation.NonNullByDefault;
  29 import org.eclipse.jdt.annotation.Nullable;
  30 import org.openhab.core.thing.Thing;
  31 import org.osgi.service.http.HttpService;
  32 import org.osgi.service.http.NamespaceException;
  33 import org.slf4j.Logger;
  34 import org.slf4j.LoggerFactory;
  35
  36 /**
  37  * This servlet provides the base navigation page, with hyperlinks for the defined account things
  38  *
  39  * @author Michael Geramb - Initial Contribution
  40  */
  41 @NonNullByDefault
  42 public class BindingServlet extends HttpServlet {
  43
  44     private static final long serialVersionUID = -1453738923337413163L;
  45
  46     private final Logger logger = LoggerFactory.getLogger(BindingServlet.class);
  47
  48     String servletUrlWithoutRoot;
  49     String servletUrl;
  50     HttpService httpService;
  51
  52     List<Thing> accountHandlers = new ArrayList<>();
  53
  54     public BindingServlet(HttpService httpService) {
  55         this.httpService = httpService;
  56         servletUrlWithoutRoot = "amazonechocontrol";
  57         servletUrl = "/" + servletUrlWithoutRoot;
  58         try {
  59             httpService.registerServlet(servletUrl, this, null, httpService.createDefaultHttpContext());
  60         } catch (NamespaceException | ServletException e) {
  61             logger.warn("Register servlet fails", e);
  62         }
  63     }
  64
  65     public void addAccountThing(Thing accountThing) {
  66         synchronized (accountHandlers) {
  67             accountHandlers.add(accountThing);
  68         }
  69     }
  70
  71     public void removeAccountThing(Thing accountThing) {
  72         synchronized (accountHandlers) {
  73             accountHandlers.remove(accountThing);
  74         }
  75     }
  76
  77     public void dispose() {
  78         httpService.unregister(servletUrl);
  79     }
  80
  81     @Override
  82     protected void doGet(@Nullable HttpServletRequest req, @Nullable HttpServletResponse resp)
  83             throws ServletException, IOException {
  84         if (req == null) {
  85             return;
  86         }
  87         if (resp == null) {
  88             return;
  89         }
  90         String uri = req.getRequestURI().substring(servletUrl.length());
  91         String queryString = req.getQueryString();
  92         if (queryString != null && queryString.length() > 0) {
  93             uri += "?" + queryString;
  94         }
  95         logger.debug("doGet {}", uri);
  96
  97         if (!uri.equals("/")) {
  98             String newUri = req.getServletPath() + "/";
  99             resp.sendRedirect(newUri);
 100             return;
 101         }
 102
 103         StringBuilder html = new StringBuilder();
 104         html.append("<html><head><title>" + StringEscapeUtils.escapeHtml(BINDING_NAME) + "</title><head><body>");
 105         html.append("<h1>" + StringEscapeUtils.escapeHtml(BINDING_NAME) + "</h1>");
 106
 107         synchronized (accountHandlers) {
 108             if (accountHandlers.isEmpty()) {
 109                 html.append("No Account thing created.");
 110             } else {
 111                 for (Thing accountHandler : accountHandlers) {
 112                     String url = URLEncoder.encode(accountHandler.getUID().getId(), "UTF8");
 113                     html.append("<a href='./" + url + " '>" + StringEscapeUtils.escapeHtml(accountHandler.getLabel())
 114                             + "</a><br>");
 115                 }
 116             }
 117         }
 118         html.append("</body></html>");
 119
 120         resp.addHeader("content-type", "text/html;charset=UTF-8");
 121         try {
 122             resp.getWriter().write(html.toString());
 123         } catch (IOException e) {
 124             logger.warn("return html failed with uri syntax error", e);
 125         }
 126     }
 127 }