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.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 doGet(HttpServletRequest req, HttpServletResponse resp) {
  62         logger.debug("Unhandled get request: {}?{}", req.getRequestURI(), req.getQueryString());
  63     }
  64
  65     @Override
  66     protected void doPost(HttpServletRequest req, HttpServletResponse resp) {
  67         logger.debug("Got POST: {}", req.getRequestURI());
  68         handleDeviceCallback(req, resp);
  69     }
  70
  71     @Override
  72     protected void doPut(HttpServletRequest req, HttpServletResponse resp) {
  73         logger.debug("Got PUT: {}", req.getRequestURI());
  74         handleDeviceCallback(req, resp);
  75     }
  76
  77     private void handleDeviceCallback(HttpServletRequest req, HttpServletResponse resp) {
  78         try {
  79             String data = inputStreamToString(req);
  80
  81             logger.debug("The raw json data is: {}", data);
  82             if (data != null && !konnectedThingHandlers.isEmpty()) {
  83                 KonnectedModuleGson event = gson.fromJson(data, KonnectedModuleGson.class);
  84                 String authorizationHeader = req.getHeader("Authorization");
  85                 String thingHandlerKey = authorizationHeader.substring("Bearer".length()).trim();
  86                 logger.debug("The thing handler to send the command to is the handler for thing: {}", thingHandlerKey);
  87                 try {
  88                     KonnectedHandler thingHandler = konnectedThingHandlers.get(thingHandlerKey);
  89                     thingHandler.handleWebHookEvent(event);
  90                 } catch (NullPointerException e) {
  91                     logger.debug("There was not a handler registered on the servlet to handler commands for thing: {}",
  92                             thingHandlerKey);
  93                 }
  94             }
  95
  96             setHeaders(resp);
  97             resp.getWriter().write("");
  98         } catch (IOException | JsonSyntaxException e) {
  99             logger.debug("The response received from the module was not valid. {}", e.getMessage());
 100         }
 101     }
 102
 103     private String inputStreamToString(HttpServletRequest req) throws IOException {
 104         Scanner scanner = new Scanner(req.getInputStream()).useDelimiter("\\A");
 105         return scanner.hasNext() ? scanner.next() : null;
 106     }
 107
 108     private void setHeaders(HttpServletResponse response) {
 109         response.setCharacterEncoding(CHARSET);
 110         response.setContentType(APPLICATION_JSON);
 111         response.setHeader("Access-Control-Allow-Origin", "*");
 112         response.setHeader("Access-Control-Allow-Methods", "PUT");
 113         response.setHeader("Access-Control-Max-Age", "3600");
 114         response.setHeader("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
 115     }
 116 }