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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.androidtv.internal.protocol.shieldtv;
  14
  15 import static org.openhab.binding.androidtv.internal.protocol.shieldtv.ShieldTVConstants.*;
  16
  17 import java.util.ArrayList;
  18 import java.util.Base64;
  19 import java.util.Collections;
  20 import java.util.HashMap;
  21 import java.util.LinkedHashMap;
  22 import java.util.List;
  23 import java.util.Map;
  24 import java.util.Map.Entry;
  25
  26 import javax.xml.bind.DatatypeConverter;
  27
  28 import org.eclipse.jdt.annotation.NonNullByDefault;
  29 import org.slf4j.Logger;
  30 import org.slf4j.LoggerFactory;
  31
  32 /**
  33  * Class responsible for parsing incoming ShieldTV messages. Calls back to an object implementing the
  34  * ShieldTVMessageParserCallbacks interface.
  35  *
  36  * Adapted from Lutron Leap binding
  37  *
  38  * @author Ben Rosenblum - Initial contribution
  39  */
  40
  41 @NonNullByDefault
  42 public class ShieldTVMessageParser {
  43     private final Logger logger = LoggerFactory.getLogger(ShieldTVMessageParser.class);
  44
  45     private final ShieldTVConnectionManager callback;
  46
  47     public ShieldTVMessageParser(ShieldTVConnectionManager callback) {
  48         this.callback = callback;
  49     }
  50
  51     public void handleMessage(String msg) {
  52         if (msg.trim().isEmpty()) {
  53             return; // Ignore empty lines
  54         }
  55
  56         String thingId = callback.getThingID();
  57         String hostName = callback.getHostName();
  58         logger.trace("{} - Received ShieldTV message from: {} - Message: {}", thingId, hostName, msg);
  59
  60         callback.validMessageReceived();
  61
  62         char[] charArray = msg.toCharArray();
  63
  64         try {
  65             // All lengths are little endian when larger than 0xff
  66             if (msg.startsWith(MESSAGE_LOWPRIV) && msg.startsWith(MESSAGE_SHORTNAME, 8)) {
  67                 // Pre-login Hostname of Shield Replied
  68                 // 080a 12 1408e807 12 0f08e807 12 LEN Hostname 18d7fd04 180a
  69                 // 080a 12 1d08e807 12 180801 12 LEN Hostname 18d7fd04 180a
  70                 // 080a 12 2208e807 12 1d08e807 12 LEN Hostname 18d7fd04 180a
  71                 // Each chunk ends in 12
  72                 // 4th chunk represent length of the name.
  73                 // 5th chunk is the name
  74                 int chunk = 0;
  75                 int i = 0;
  76                 String st = "";
  77                 StringBuilder hostname = new StringBuilder();
  78                 while (chunk < 3) {
  79                     st = "" + charArray[i] + "" + charArray[i + 1];
  80                     if (DELIMITER_12.equals(st)) {
  81                         chunk++;
  82                     }
  83                     i += 2;
  84                 }
  85                 st = "" + charArray[i] + "" + charArray[i + 1];
  86                 i += 2;
  87                 int length = Integer.parseInt(st, 16) * 2;
  88                 int current = i;
  89                 for (; i < current + length; i = i + 2) {
  90                     st = "" + charArray[i] + "" + charArray[i + 1];
  91                     hostname.append(st);
  92                 }
  93                 logger.trace("{} - Shield Hostname: {} {}", thingId, hostname, length);
  94                 String encHostname = ShieldTVRequest.encodeMessage(hostname.toString());
  95                 logger.debug("{} - Shield Hostname Encoded: {}", thingId, encHostname);
  96                 callback.setHostName(encHostname);
  97             } else if (msg.startsWith(MESSAGE_HOSTNAME)) {
  98                 // Longer hostname reply
  99                 // 080b 12 5b08b510 12 TOTALLEN? 0a LEN Hostname 12 LEN IPADDR Padding? 22 LEN DeviceID 2a LEN arm64-v8a
 100                 // 2a LEN armeabi-v7a 2a LEN armeabi 180b
 101                 // It's possible for there to be more or less of the arm lists
 102                 logger.trace("{} - Longer Hostname Reply", thingId);
 103
 104                 int i = 20;
 105                 int length;
 106                 int current;
 107
 108                 // Hostname
 109                 String st = "" + charArray[i] + "" + charArray[i + 1];
 110                 length = Integer.parseInt(st, 16) * 2;
 111                 i += 2;
 112
 113                 StringBuilder hostname = new StringBuilder();
 114                 current = i;
 115
 116                 for (; i < current + length; i = i + 2) {
 117                     st = "" + charArray[i] + "" + charArray[i + 1];
 118                     hostname.append(st);
 119                 }
 120
 121                 i += 2; // 12
 122
 123                 // ipAddress
 124                 st = "" + charArray[i] + "" + charArray[i + 1];
 125                 length = Integer.parseInt(st, 16) * 2;
 126                 i += 2;
 127
 128                 StringBuilder ipAddress = new StringBuilder();
 129                 current = i;
 130
 131                 for (; i < current + length; i = i + 2) {
 132                     st = "" + charArray[i] + "" + charArray[i + 1];
 133                     ipAddress.append(st);
 134                 }
 135
 136                 st = "" + charArray[i] + "" + charArray[i + 1];
 137                 while (!DELIMITER_22.equals(st)) {
 138                     i += 2;
 139                     st = "" + charArray[i] + "" + charArray[i + 1];
 140                 }
 141
 142                 i += 2; // 22
 143
 144                 // deviceId
 145
 146                 st = "" + charArray[i] + "" + charArray[i + 1];
 147                 length = Integer.parseInt(st, 16) * 2;
 148                 i += 2;
 149
 150                 StringBuilder deviceId = new StringBuilder();
 151                 current = i;
 152
 153                 for (; i < current + length; i = i + 2) {
 154                     st = "" + charArray[i] + "" + charArray[i + 1];
 155                     deviceId.append(st);
 156                 }
 157
 158                 // architectures
 159                 st = "" + charArray[i] + "" + charArray[i + 1];
 160                 StringBuilder arch = new StringBuilder();
 161                 while (DELIMITER_2A.equals(st)) {
 162                     i += 2;
 163                     st = "" + charArray[i] + "" + charArray[i + 1];
 164                     length = Integer.parseInt(st, 16) * 2;
 165                     i += 2;
 166                     current = i;
 167                     for (; i < current + length; i = i + 2) {
 168                         st = "" + charArray[i] + "" + charArray[i + 1];
 169                         arch.append(st);
 170                     }
 171                     st = "" + charArray[i] + "" + charArray[i + 1];
 172                     if (DELIMITER_2A.equals(st)) {
 173                         arch.append("2c");
 174                     }
 175                 }
 176
 177                 String encHostname = ShieldTVRequest.encodeMessage(hostname.toString());
 178                 String encIpAddress = ShieldTVRequest.encodeMessage(ipAddress.toString());
 179                 String encDeviceId = ShieldTVRequest.encodeMessage(deviceId.toString());
 180                 String encArch = ShieldTVRequest.encodeMessage(arch.toString());
 181                 logger.debug("{} - Hostname: {} - ipAddress: {} - deviceId: {} - arch: {}", thingId, encHostname,
 182                         encIpAddress, encDeviceId, encArch);
 183                 callback.setHostName(encHostname);
 184                 callback.setDeviceID(encDeviceId);
 185                 callback.setArch(encArch);
 186             } else if (APP_START_SUCCESS.equals(msg)) {
 187                 // App successfully started
 188                 logger.debug("{} -  App started successfully", thingId);
 189             } else if (APP_START_FAILED.equals(msg)) {
 190                 // App failed to start
 191                 logger.debug("{} - App failed to start", thingId);
 192             } else if (msg.startsWith(MESSAGE_APPDB) && msg.startsWith(DELIMITER_0A, 18)) {
 193                 // Individual update?
 194                 // 08f10712 5808061254 0a LEN app.name 12 LEN app.real.name 22 LEN URL 2801 300118f107
 195                 logger.info("{} - Individual App Update - Please Report This: {}", thingId, msg);
 196             } else if (msg.startsWith(MESSAGE_APPDB) && (msg.length() > 30)) {
 197                 // Massive dump of currently installed apps
 198                 // 08f10712 d81f080112 d31f0a540a LEN app.name 12 LEN app.real.name 22 LEN URL 2801 30010a650a LEN
 199                 Map<String, String> appNameDB = new HashMap<>();
 200                 Map<String, String> appURLDB = new HashMap<>();
 201                 int appCount = 0;
 202                 int i = 18;
 203                 String st = "";
 204                 int length;
 205                 int current;
 206                 StringBuilder appSBPrepend = new StringBuilder();
 207                 StringBuilder appSBDN = new StringBuilder();
 208
 209                 // Load default apps that don't get sent in payload
 210
 211                 appNameDB.put("com.google.android.tvlauncher", "Android TV Home");
 212                 appURLDB.put("com.google.android.tvlauncher", "");
 213
 214                 appNameDB.put("com.google.android.katniss", "Google app for Android TV");
 215                 appURLDB.put("com.google.android.katniss", "");
 216
 217                 appNameDB.put("com.google.android.katnisspx", "Google app for Android TV (Pictures)");
 218                 appURLDB.put("com.google.android.katnisspx", "");
 219
 220                 appNameDB.put("com.google.android.backdrop", "Backdrop Daydream");
 221                 appURLDB.put("com.google.android.backdrop", "");
 222
 223                 // Packet will end with 300118f107 after last entry
 224
 225                 while (i < msg.length() - 10) {
 226                     StringBuilder appSBName = new StringBuilder();
 227                     StringBuilder appSBURL = new StringBuilder();
 228
 229                     // There are instances such as plex where multiple apps are sent as part of the same payload
 230                     // This is identified when 12 is the beginning of the set
 231
 232                     st = "" + charArray[i] + "" + charArray[i + 1];
 233
 234                     if (!DELIMITER_12.equals(st)) {
 235                         appSBPrepend = new StringBuilder();
 236                         appSBDN = new StringBuilder();
 237
 238                         appCount++;
 239
 240                         // App Prepend
 241                         // Usually 10 in length but can be longer or shorter so look for 0a twice
 242                         do {
 243                             st = "" + charArray[i] + "" + charArray[i + 1];
 244                             appSBPrepend.append(st);
 245                             i += 2;
 246                         } while (!DELIMITER_0A.equals(st));
 247                         do {
 248                             st = "" + charArray[i] + "" + charArray[i + 1];
 249                             appSBPrepend.append(st);
 250                             i += 2;
 251                         } while (!DELIMITER_0A.equals(st));
 252                         st = "" + charArray[i] + "" + charArray[i + 1];
 253
 254                         // Look for a third 0a, but only if 12 is not down the line
 255                         // If 12 is exactly 20 away from 0a that means that the DN was actually 10 long
 256                         String st2 = "" + charArray[i + 22] + "" + charArray[i + 23];
 257                         if (DELIMITER_0A.equals(st.toString()) && !DELIMITER_12.equals(st2)) {
 258                             appSBPrepend.append(st);
 259                             i += 2;
 260                             st = "" + charArray[i] + "" + charArray[i + 1];
 261                         }
 262
 263                         // app DN
 264                         length = Integer.parseInt(st, 16) * 2;
 265                         i += 2;
 266                         current = i;
 267                         for (; i < current + length; i = i + 2) {
 268                             st = "" + charArray[i] + "" + charArray[i + 1];
 269                             appSBDN.append(st);
 270                         }
 271                     } else {
 272                         logger.trace("Second Entry");
 273                     }
 274
 275                     // App Name
 276
 277                     i += 2; // 12 delimiter
 278                     st = "" + charArray[i] + "" + charArray[i + 1];
 279                     i += 2;
 280                     length = Integer.parseInt(st, 16) * 2;
 281                     current = i;
 282                     for (; i < current + length; i = i + 2) {
 283                         st = "" + charArray[i] + "" + charArray[i + 1];
 284                         appSBName.append(st);
 285                     }
 286
 287                     // There are times where there is padding here for no reason beyond the specified length.
 288                     // Proceed forward until we get to the 22 delimiter
 289
 290                     st = "" + charArray[i] + "" + charArray[i + 1];
 291                     while (!DELIMITER_22.equals(st)) {
 292                         i += 2;
 293                         st = "" + charArray[i] + "" + charArray[i + 1];
 294                     }
 295
 296                     // App URL
 297                     i += 2; // 22 delimiter
 298                     st = "" + charArray[i] + "" + charArray[i + 1];
 299                     i += 2;
 300                     length = Integer.parseInt(st, 16) * 2;
 301                     current = i;
 302                     for (; i < current + length; i = i + 2) {
 303                         st = "" + charArray[i] + "" + charArray[i + 1];
 304                         appSBURL.append(st);
 305                     }
 306                     st = "" + charArray[i] + "" + charArray[i + 1];
 307                     if (!DELIMITER_12.equals(st)) {
 308                         i += 4; // terminates 2801
 309                     }
 310                     String appPrepend = appSBPrepend.toString();
 311                     String appDN = ShieldTVRequest.encodeMessage(appSBDN.toString());
 312                     String appName = ShieldTVRequest.encodeMessage(appSBName.toString());
 313                     String appURL = ShieldTVRequest.encodeMessage(appSBURL.toString());
 314                     logger.debug("{} - AppPrepend: {} AppDN: {} AppName: {} AppURL: {}", thingId, appPrepend, appDN,
 315                             appName, appURL);
 316                     appNameDB.put(appDN, appName);
 317                     appURLDB.put(appDN, appURL);
 318                 }
 319                 if (appCount > 0) {
 320                     Map<String, String> sortedAppNameDB = new LinkedHashMap<>();
 321                     List<String> valueList = new ArrayList<>();
 322                     for (Map.Entry<String, String> entry : appNameDB.entrySet()) {
 323                         valueList.add(entry.getValue());
 324                     }
 325                     Collections.sort(valueList);
 326                     for (String str : valueList) {
 327                         for (Entry<String, String> entry : appNameDB.entrySet()) {
 328                             if (entry.getValue().equals(str)) {
 329                                 sortedAppNameDB.put(entry.getKey(), str);
 330                             }
 331                         }
 332                     }
 333
 334                     logger.trace("{} - MP appNameDB: {} sortedAppNameDB: {} appURLDB: {}", thingId,
 335                             appNameDB.toString(), sortedAppNameDB.toString(), appURLDB.toString());
 336                     callback.setAppDB(sortedAppNameDB, appURLDB);
 337                 } else {
 338                     logger.warn("{} - MP empty msg: {} appDB appNameDB: {} appURLDB: {}", thingId, msg,
 339                             appNameDB.toString(), appURLDB.toString());
 340                 }
 341             } else if (msg.startsWith(MESSAGE_GOOD_COMMAND)) {
 342                 // This has something to do with successful command response, maybe.
 343             } else if (KEEPALIVE_REPLY.equals(msg)) {
 344                 // Keepalive Reply
 345             } else if (msg.startsWith(MESSAGE_LOWPRIV) && msg.startsWith(MESSAGE_PINSTART, 6)) {
 346                 // 080a 12 0308cf08 180a
 347                 logger.debug("PIN Process Started");
 348             } else if (msg.startsWith(MESSAGE_CERT_COMING) && msg.length() == 6) {
 349                 // This seems to be 20**** when observed. It is unclear what this does.
 350                 // This seems to send immediately before the certificate reply and as a reply to the pin being sent
 351             } else if (msg.startsWith(MESSAGE_SUCCESS)) {
 352                 // Successful command received
 353                 // 08f007 12 0c 0804 12 08 0a0608 01100c200f 18f007 - GOOD LOGIN
 354                 // 08f007 12 LEN 0804 12 LEN 0a0608 01100c200f 18f007
 355                 //
 356                 // 08f00712 0c 0804 12 08 0a0608 01100e200f 18f007 KEY_VOLDOWN
 357                 // 08f00712 0c 0804 12 08 0a0608 01100f200f 18f007 KEY_VOLUP
 358                 // 08f00712 0c 0804 12 08 0a0608 01200f2801 18f007 KEY_MUTE
 359                 logger.info("{} - Login Successful to {}", thingId, callback.getHostName());
 360                 callback.setLoggedIn(true);
 361             } else if (TIMEOUT.equals(msg)) {
 362                 // Timeout
 363                 // 080a 12 1108b510 12 0c0804 12 08 54696d65206f7574 180a
 364                 // 080a 12 1108b510 12 0c0804 12 LEN Timeout 180a
 365                 logger.debug("{} - Timeout {}", thingId, msg);
 366             } else if (msg.startsWith(MESSAGE_APP_SUCCESS) && msg.startsWith(MESSAGE_APP_GET_SUCCESS, 10)) {
 367                 // Get current app command successful. Usually paired with 0807 reply below.
 368             } else if (msg.startsWith(MESSAGE_APP_SUCCESS) && msg.startsWith(MESSAGE_APP_CURRENT, 10)) {
 369                 // Current App
 370                 // 08ec07 12 2a0807 22 262205 656e5f555342 1d 636f6d2e676f6f676c652e616e64726f69642e74766c61756e63686572
 371                 // 18ec07
 372                 // 08ec07 12 2a0807 22 262205 en_USB LEN AppName 18ec07
 373                 StringBuilder appName = new StringBuilder();
 374                 String lengthStr = "" + charArray[34] + charArray[35];
 375                 int length = Integer.parseInt(lengthStr, 16) * 2;
 376                 for (int i = 36; i < 36 + length; i++) {
 377                     appName.append(charArray[i]);
 378                 }
 379                 logger.debug("{} - Current App: {}", thingId, ShieldTVRequest.encodeMessage(appName.toString()));
 380                 callback.setCurrentApp(ShieldTVRequest.encodeMessage(appName.toString()));
 381             } else if (msg.startsWith(MESSAGE_LOWPRIV) && msg.startsWith(MESSAGE_CERT, 10)) {
 382                 // Certificate Reply
 383                 // |--6-----------12-----------10---------------16---------6--- = 50 characters long
 384                 // |080a 12 ad10 08b510 12 a710 0801 12 07 53756363657373 1ac009 3082... 3082... 180a
 385                 // |080a 12 9f10 08b510 12 9910 0801 12 07 53756363657373 1ac209 3082... 3082... 180a
 386                 // |--------Little Endian Total Payload Length
 387                 // |-----------------------Little Endian Remaining Payload Length
 388                 // |-----------------------------------Length of SUCCESS
 389                 // |--------------------------------------ASCII: SUCCESS
 390                 // |-----------------------------------------------------Little Endian Length (e.g. 09c0 and 09c2 above)
 391                 // |------------------------------------------------------------Priv Key RSA 2048
 392                 // |--------------------------------------------------------------------Cert X.509
 393                 if (msg.startsWith(MESSAGE_CERT_PAYLOAD, 28)) {
 394                     StringBuilder preamble = new StringBuilder();
 395                     StringBuilder privKey = new StringBuilder();
 396                     StringBuilder pubKey = new StringBuilder();
 397                     int i = 0;
 398                     int current;
 399                     for (; i < 44; i++) {
 400                         preamble.append(charArray[i]);
 401                     }
 402                     logger.trace("{} - Cert Preamble:   {}", thingId, preamble.toString());
 403
 404                     i += 2; // 1a
 405                     String st = "" + charArray[i + 2] + "" + charArray[i + 3] + "" + charArray[i] + ""
 406                             + charArray[i + 1];
 407                     int privLen = 2246 + ((Integer.parseInt(st, 16) - 2400) * 2);
 408                     i += 4; // length
 409                     current = i;
 410
 411                     logger.trace("{} - Cert privLen: {} {}", thingId, st, privLen);
 412
 413                     for (; i < current + privLen; i++) {
 414                         privKey.append(charArray[i]);
 415                     }
 416
 417                     logger.trace("{} - Cert privKey: {} {}", thingId, privLen, privKey.toString());
 418
 419                     for (; i < msg.length() - 4; i++) {
 420                         pubKey.append(charArray[i]);
 421                     }
 422
 423                     logger.trace("{} - Cert pubKey:  {} {}", thingId, msg.length() - privLen - 4, pubKey.toString());
 424
 425                     logger.debug("{} - Cert Pair Received privLen: {} pubLen: {}", thingId, privLen,
 426                             msg.length() - privLen - 4);
 427
 428                     byte[] privKeyB64Byte = DatatypeConverter.parseHexBinary(privKey.toString());
 429                     byte[] pubKeyB64Byte = DatatypeConverter.parseHexBinary(pubKey.toString());
 430
 431                     String privKeyB64 = Base64.getEncoder().encodeToString(privKeyB64Byte);
 432                     String pubKeyB64 = Base64.getEncoder().encodeToString(pubKeyB64Byte);
 433
 434                     callback.setKeys(privKeyB64, pubKeyB64);
 435                 } else {
 436                     logger.info("{} - Pin Process Failed.", thingId);
 437                 }
 438             } else {
 439                 logger.info("{} - Unknown payload received. {}", thingId, msg);
 440             }
 441         } catch (Exception e) {
 442             logger.info("{} - Message Parser Caught Exception", thingId, e);
 443         }
 444     }
 445 }