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   1 /**
   2  * Copyright (c) 2010-2021 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.konnected.internal.servlet;
  14
  15 import java.io.IOException;
  16 import java.util.HashMap;
  17 import java.util.Scanner;
  18
  19 import javax.servlet.http.HttpServlet;
  20 import javax.servlet.http.HttpServletRequest;
  21 import javax.servlet.http.HttpServletResponse;
  22
  23 import org.openhab.binding.konnected.internal.gson.KonnectedModuleGson;
  24 import org.openhab.binding.konnected.internal.handler.KonnectedHandler;
  25 import org.slf4j.Logger;
  26 import org.slf4j.LoggerFactory;
  27
  28 import com.google.gson.Gson;
  29 import com.google.gson.JsonSyntaxException;
  30
  31 /**
  32  * Main OSGi service and HTTP servlet for Konnected Webhook.
  33  *
  34  * @author Zachary Christiansen - Initial contribution
  35  */
  36 public class KonnectedHTTPServlet extends HttpServlet {
  37     private final Logger logger = LoggerFactory.getLogger(KonnectedHTTPServlet.class);
  38
  39     private static final long serialVersionUID = 1288539782077957954L;
  40     private static final String APPLICATION_JSON = "application/json";
  41     private static final String CHARSET = "utf-8";
  42     private final Gson gson = new Gson();
  43
  44     private HashMap<String, KonnectedHandler> konnectedThingHandlers = new HashMap<>();
  45
  46     public KonnectedHTTPServlet() {
  47     }
  48
  49     public void add(KonnectedHandler thingHandler) {
  50         logger.trace("Adding KonnectedHandler[{}] to KonnectedHTTPServlet.", thingHandler.getThing().getUID());
  51         konnectedThingHandlers.put(thingHandler.getThing().getUID().getAsString(), thingHandler);
  52     }
  53
  54     public void remove(KonnectedHandler thingHandler) {
  55         logger.trace("Removing KonnectedHandler [{}] from KonnectedHTTPServlet. ", thingHandler.getThing().getUID());
  56
  57         konnectedThingHandlers.remove(thingHandler.getThing().getUID().getAsString());
  58     }
  59
  60     @Override
  61     protected void service(HttpServletRequest req, HttpServletResponse resp) {
  62         try {
  63             String data = inputStreamToString(req);
  64
  65             logger.debug("The raw json data is: {}", data);
  66             if (data != null && !konnectedThingHandlers.isEmpty()) {
  67                 KonnectedModuleGson event = gson.fromJson(data, KonnectedModuleGson.class);
  68                 String authorizationHeader = req.getHeader("Authorization");
  69                 String thingHandlerKey = authorizationHeader.substring("Bearer".length()).trim();
  70                 logger.debug("The path of the response was: {}", req.getContextPath());
  71                 logger.debug("The json received was: {}", event.toString());
  72                 logger.debug("The thing handler to send the command to is the handler for thing: {}", thingHandlerKey);
  73                 try {
  74                     KonnectedHandler thingHandler = konnectedThingHandlers.get(thingHandlerKey);
  75                     thingHandler.handleWebHookEvent(event);
  76                 } catch (NullPointerException e) {
  77                     logger.debug("There was not a handler registered on the servlet to handler commands for thing: {}",
  78                             thingHandlerKey);
  79                 }
  80             }
  81
  82             setHeaders(resp);
  83             resp.getWriter().write("");
  84         } catch (IOException | JsonSyntaxException e) {
  85             logger.debug("The response received from the module was not valid. {}", e.getMessage());
  86         }
  87     }
  88
  89     private String inputStreamToString(HttpServletRequest req) throws IOException {
  90         Scanner scanner = new Scanner(req.getInputStream()).useDelimiter("\\A");
  91         return scanner.hasNext() ? scanner.next() : "";
  92     }
  93
  94     private void setHeaders(HttpServletResponse response) {
  95         response.setCharacterEncoding(CHARSET);
  96         response.setContentType(APPLICATION_JSON);
  97         response.setHeader("Access-Control-Allow-Origin", "*");
  98         response.setHeader("Access-Control-Allow-Methods", "PUT");
  99         response.setHeader("Access-Control-Max-Age", "3600");
 100         response.setHeader("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
 101     }
 102 }