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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 static final int REQUEST_TIMEOUT_MS = 10_000;
  51     private final Logger logger = LoggerFactory.getLogger(McdBridgeHandler.class);
  52
  53     private @Nullable McdBridgeConfiguration config;
  54
  55     private final HttpClient httpClient;
  56     private final Gson gson;
  57
  58     private String accessToken = "";
  59     private int expiresIn;
  60     private @Nullable ScheduledFuture<?> future = null;
  61
  62     private HashSet<Listener> listeners = new HashSet<>();
  63
  64     public McdBridgeHandler(Bridge bridge, HttpClient httpClient) {
  65         super(bridge);
  66         this.httpClient = httpClient;
  67         gson = new Gson();
  68     }
  69
  70     @Override
  71     public void initialize() {
  72         config = getConfigAs(McdBridgeConfiguration.class);
  73         updateStatus(ThingStatus.UNKNOWN);
  74         scheduler.execute(this::logMeIn);
  75     }
  76
  77     @Override
  78     public void handleCommand(ChannelUID channelUID, Command command) {
  79     }
  80
  81     @Override
  82     public void dispose() {
  83         ScheduledFuture<?> localFuture = future;
  84         if (localFuture != null) {
  85             localFuture.cancel(true);
  86         }
  87     }
  88
  89     public void register(Listener listener) {
  90         listeners.add(listener);
  91     }
  92
  93     private void triggerEvent() {
  94         logger.debug("Event triggered");
  95         for (Listener l : listeners) {
  96             l.onEvent();
  97         }
  98     }
  99
 100     /**
 101      * Uses the given credentials to log the user in.
 102      */
 103     protected void logMeIn() {
 104         logger.debug("Logging in...");
 105         McdBridgeConfiguration localConfig = config;
 106         if (localConfig != null) {
 107             try {
 108                 Request request = httpClient.newRequest("https://cunds-syncapi.azurewebsites.net/token")
 109                         .method(HttpMethod.POST).header(HttpHeader.CONTENT_TYPE, "application/x-www-form-urlencoded")
 110                         .header(HttpHeader.HOST, "cunds-syncapi.azurewebsites.net")
 111                         .header(HttpHeader.ACCEPT, "application/json")
 112                         .timeout(REQUEST_TIMEOUT_MS, TimeUnit.MILLISECONDS);
 113
 114                 String content = "grant_type=password&username=" + localConfig.getUserEmail() + "&password="
 115                         + localConfig.getUserPassword();
 116                 request.content(new StringContentProvider(content), "application/x-www-form-urlencoded");
 117                 request.send(new BufferingResponseListener() {
 118                     @NonNullByDefault({})
 119                     @Override
 120                     public void onComplete(Result result) {
 121                         String contentString = getContentAsString();
 122                         JsonObject content = gson.fromJson(contentString, JsonObject.class);
 123                         int responseCode = result.getResponse().getStatus();
 124                         switch (responseCode) {
 125                             case 200:
 126                                 if (content != null && content.has("access_token")) {
 127                                     updateStatus(ThingStatus.ONLINE);
 128                                     accessToken = content.get("access_token").getAsString();
 129                                     expiresIn = content.get("expires_in").getAsInt();
 130                                     long delay = ((long) expiresIn) * 1000L - 60000L;
 131                                     Runnable task = () -> {
 132                                         logMeIn();
 133                                     };
 134                                     future = scheduler.schedule(task, delay, TimeUnit.MILLISECONDS);
 135                                     getAccessToken();
 136                                     break;
 137                                 } // else go to default
 138                             case 400:
 139                                 updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.CONFIGURATION_ERROR,
 140                                         "wrong credentials");
 141                                 break;
 142                             case 0:
 143                                 updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.COMMUNICATION_ERROR,
 144                                         "please check your internet connection");
 145                                 break;
 146                             default:
 147                                 updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.COMMUNICATION_ERROR,
 148                                         "Login was not successful");
 149                         }
 150                         triggerEvent();
 151                     }
 152                 });
 153             } catch (Exception e) {
 154                 updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.COMMUNICATION_ERROR, e.getMessage());
 155             }
 156         }
 157     }
 158
 159     /**
 160      * Should be used by C&amp;S binding's things to obtain the bridge's access token
 161      *
 162      * @return returns the access token as String
 163      */
 164     protected String getAccessToken() {
 165         return accessToken;
 166     }
 167 }