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   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.mcd.internal.handler;
  14
  15 import java.util.HashSet;
  16 import java.util.concurrent.ScheduledFuture;
  17 import java.util.concurrent.TimeUnit;
  18
  19 import org.eclipse.jdt.annotation.NonNullByDefault;
  20 import org.eclipse.jdt.annotation.Nullable;
  21 import org.eclipse.jetty.client.HttpClient;
  22 import org.eclipse.jetty.client.api.Request;
  23 import org.eclipse.jetty.client.api.Result;
  24 import org.eclipse.jetty.client.util.BufferingResponseListener;
  25 import org.eclipse.jetty.client.util.StringContentProvider;
  26 import org.eclipse.jetty.http.HttpHeader;
  27 import org.eclipse.jetty.http.HttpMethod;
  28 import org.openhab.binding.mcd.internal.util.Listener;
  29 import org.openhab.core.thing.Bridge;
  30 import org.openhab.core.thing.ChannelUID;
  31 import org.openhab.core.thing.ThingStatus;
  32 import org.openhab.core.thing.ThingStatusDetail;
  33 import org.openhab.core.thing.binding.BaseBridgeHandler;
  34 import org.openhab.core.types.Command;
  35 import org.slf4j.Logger;
  36 import org.slf4j.LoggerFactory;
  37
  38 import com.google.gson.Gson;
  39 import com.google.gson.JsonObject;
  40
  41 /**
  42  * The {@link McdBridgeHandler} is responsible for handling commands, which are
  43  * sent to one of the channels.
  44  *
  45  * @author Simon Dengler - Initial contribution
  46  */
  47 @NonNullByDefault
  48 public class McdBridgeHandler extends BaseBridgeHandler {
  49
  50     private final Logger logger = LoggerFactory.getLogger(McdBridgeHandler.class);
  51
  52     private @Nullable McdBridgeConfiguration config;
  53
  54     private final HttpClient httpClient;
  55     private final Gson gson;
  56
  57     private String accessToken = "";
  58     private int expiresIn;
  59     private @Nullable ScheduledFuture<?> future = null;
  60
  61     private HashSet<Listener> listeners = new HashSet<>();
  62
  63     public McdBridgeHandler(Bridge bridge, HttpClient httpClient) {
  64         super(bridge);
  65         this.httpClient = httpClient;
  66         gson = new Gson();
  67     }
  68
  69     @Override
  70     public void initialize() {
  71         config = getConfigAs(McdBridgeConfiguration.class);
  72         updateStatus(ThingStatus.UNKNOWN);
  73         scheduler.execute(this::logMeIn);
  74     }
  75
  76     @Override
  77     public void handleCommand(ChannelUID channelUID, Command command) {
  78     }
  79
  80     @Override
  81     public void dispose() {
  82         ScheduledFuture<?> localFuture = future;
  83         if (localFuture != null) {
  84             localFuture.cancel(true);
  85         }
  86     }
  87
  88     public void register(Listener listener) {
  89         listeners.add(listener);
  90     }
  91
  92     private void triggerEvent() {
  93         logger.debug("Event triggered");
  94         for (Listener l : listeners) {
  95             l.onEvent();
  96         }
  97     }
  98
  99     /**
 100      * Uses the given credentials to log the user in.
 101      */
 102     protected void logMeIn() {
 103         logger.debug("Logging in...");
 104         McdBridgeConfiguration localConfig = config;
 105         if (localConfig != null) {
 106             try {
 107                 Request request = httpClient.newRequest("https://cunds-syncapi.azurewebsites.net/token")
 108                         .method(HttpMethod.POST).header(HttpHeader.CONTENT_TYPE, "application/x-www-form-urlencoded")
 109                         .header(HttpHeader.HOST, "cunds-syncapi.azurewebsites.net")
 110                         .header(HttpHeader.ACCEPT, "application/json");
 111                 String content = "grant_type=password&username=" + localConfig.getUserEmail() + "&password="
 112                         + localConfig.getUserPassword();
 113                 request.content(new StringContentProvider(content), "application/x-www-form-urlencoded");
 114                 request.send(new BufferingResponseListener() {
 115                     @NonNullByDefault({})
 116                     @Override
 117                     public void onComplete(Result result) {
 118                         String contentString = getContentAsString();
 119                         JsonObject content = gson.fromJson(contentString, JsonObject.class);
 120                         int responseCode = result.getResponse().getStatus();
 121                         switch (responseCode) {
 122                             case 200:
 123                                 if (content != null && content.has("access_token")) {
 124                                     updateStatus(ThingStatus.ONLINE);
 125                                     accessToken = content.get("access_token").getAsString();
 126                                     expiresIn = content.get("expires_in").getAsInt();
 127                                     long delay = ((long) expiresIn) * 1000L - 60000L;
 128                                     Runnable task = () -> {
 129                                         logMeIn();
 130                                     };
 131                                     future = scheduler.schedule(task, delay, TimeUnit.MILLISECONDS);
 132                                     getAccessToken();
 133                                     break;
 134                                 } // else go to default
 135                             case 400:
 136                                 updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.CONFIGURATION_ERROR,
 137                                         "wrong credentials");
 138                                 break;
 139                             case 0:
 140                                 updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.COMMUNICATION_ERROR,
 141                                         "please check your internet connection");
 142                                 break;
 143                             default:
 144                                 updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.COMMUNICATION_ERROR,
 145                                         "Login was not successful");
 146                         }
 147                         triggerEvent();
 148                     }
 149                 });
 150             } catch (Exception e) {
 151                 updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.COMMUNICATION_ERROR, e.getMessage());
 152             }
 153         }
 154     }
 155
 156     /**
 157      * Should be used by C&amp;S binding's things to obtain the bridge's access token
 158      *
 159      * @return returns the access token as String
 160      */
 161     protected String getAccessToken() {
 162         return accessToken;
 163     }
 164 }