1package eu.siacs.conversations.persistance;
   2
   3import android.content.ContentValues;
   4import android.content.Context;
   5import android.database.Cursor;
   6import android.database.DatabaseUtils;
   7import android.database.sqlite.SQLiteCantOpenDatabaseException;
   8import android.database.sqlite.SQLiteDatabase;
   9import android.database.sqlite.SQLiteOpenHelper;
  10import android.os.Environment;
  11import android.util.Base64;
  12import android.util.Log;
  13
  14import org.json.JSONObject;
  15import org.whispersystems.libsignal.SignalProtocolAddress;
  16import org.whispersystems.libsignal.IdentityKey;
  17import org.whispersystems.libsignal.IdentityKeyPair;
  18import org.whispersystems.libsignal.InvalidKeyException;
  19import org.whispersystems.libsignal.state.PreKeyRecord;
  20import org.whispersystems.libsignal.state.SessionRecord;
  21import org.whispersystems.libsignal.state.SignedPreKeyRecord;
  22
  23import java.io.ByteArrayInputStream;
  24import java.io.File;
  25import java.io.IOException;
  26import java.security.cert.CertificateEncodingException;
  27import java.security.cert.CertificateException;
  28import java.security.cert.CertificateFactory;
  29import java.security.cert.X509Certificate;
  30import java.util.ArrayList;
  31import java.util.HashMap;
  32import java.util.HashSet;
  33import java.util.Iterator;
  34import java.util.List;
  35import java.util.Map;
  36import java.util.Set;
  37import java.util.concurrent.CopyOnWriteArrayList;
  38import org.json.JSONException;
  39
  40import eu.siacs.conversations.Config;
  41import eu.siacs.conversations.crypto.axolotl.AxolotlService;
  42import eu.siacs.conversations.crypto.axolotl.FingerprintStatus;
  43import eu.siacs.conversations.crypto.axolotl.SQLiteAxolotlStore;
  44import eu.siacs.conversations.entities.Account;
  45import eu.siacs.conversations.entities.Contact;
  46import eu.siacs.conversations.entities.Conversation;
  47import eu.siacs.conversations.entities.Message;
  48import eu.siacs.conversations.entities.PresenceTemplate;
  49import eu.siacs.conversations.entities.Roster;
  50import eu.siacs.conversations.entities.ServiceDiscoveryResult;
  51import eu.siacs.conversations.services.ShortcutService;
  52import eu.siacs.conversations.utils.CryptoHelper;
  53import eu.siacs.conversations.utils.MimeUtils;
  54import eu.siacs.conversations.xmpp.jid.InvalidJidException;
  55import eu.siacs.conversations.xmpp.jid.Jid;
  56import eu.siacs.conversations.xmpp.mam.MamReference;
  57
  58public class DatabaseBackend extends SQLiteOpenHelper {
  59
  60	private static DatabaseBackend instance = null;
  61
  62	private static final String DATABASE_NAME = "history";
  63	private static final int DATABASE_VERSION = 38;
  64
  65	private static String CREATE_CONTATCS_STATEMENT = "create table "
  66			+ Contact.TABLENAME + "(" + Contact.ACCOUNT + " TEXT, "
  67			+ Contact.SERVERNAME + " TEXT, " + Contact.SYSTEMNAME + " TEXT,"
  68			+ Contact.JID + " TEXT," + Contact.KEYS + " TEXT,"
  69			+ Contact.PHOTOURI + " TEXT," + Contact.OPTIONS + " NUMBER,"
  70			+ Contact.SYSTEMACCOUNT + " NUMBER, " + Contact.AVATAR + " TEXT, "
  71			+ Contact.LAST_PRESENCE + " TEXT, " + Contact.LAST_TIME + " NUMBER, "
  72			+ Contact.GROUPS + " TEXT, FOREIGN KEY(" + Contact.ACCOUNT + ") REFERENCES "
  73			+ Account.TABLENAME + "(" + Account.UUID
  74			+ ") ON DELETE CASCADE, UNIQUE(" + Contact.ACCOUNT + ", "
  75			+ Contact.JID + ") ON CONFLICT REPLACE);";
  76
  77	private static String CREATE_DISCOVERY_RESULTS_STATEMENT = "create table "
  78			+ ServiceDiscoveryResult.TABLENAME + "("
  79			+ ServiceDiscoveryResult.HASH + " TEXT, "
  80			+ ServiceDiscoveryResult.VER + " TEXT, "
  81			+ ServiceDiscoveryResult.RESULT + " TEXT, "
  82			+ "UNIQUE(" + ServiceDiscoveryResult.HASH + ", "
  83			+ ServiceDiscoveryResult.VER + ") ON CONFLICT REPLACE);";
  84
  85	private static String CREATE_PRESENCE_TEMPLATES_STATEMENT = "CREATE TABLE "
  86			+ PresenceTemplate.TABELNAME + "("
  87			+ PresenceTemplate.UUID + " TEXT, "
  88			+ PresenceTemplate.LAST_USED + " NUMBER,"
  89			+ PresenceTemplate.MESSAGE + " TEXT,"
  90			+ PresenceTemplate.STATUS + " TEXT,"
  91			+ "UNIQUE("+PresenceTemplate.MESSAGE + "," +PresenceTemplate.STATUS+") ON CONFLICT REPLACE);";
  92
  93	private static String CREATE_PREKEYS_STATEMENT = "CREATE TABLE "
  94			+ SQLiteAxolotlStore.PREKEY_TABLENAME + "("
  95			+ SQLiteAxolotlStore.ACCOUNT + " TEXT,  "
  96			+ SQLiteAxolotlStore.ID + " INTEGER, "
  97			+ SQLiteAxolotlStore.KEY + " TEXT, FOREIGN KEY("
  98			+ SQLiteAxolotlStore.ACCOUNT
  99			+ ") REFERENCES " + Account.TABLENAME + "(" + Account.UUID + ") ON DELETE CASCADE, "
 100			+ "UNIQUE( " + SQLiteAxolotlStore.ACCOUNT + ", "
 101			+ SQLiteAxolotlStore.ID
 102			+ ") ON CONFLICT REPLACE"
 103			+ ");";
 104
 105	private static String CREATE_SIGNED_PREKEYS_STATEMENT = "CREATE TABLE "
 106			+ SQLiteAxolotlStore.SIGNED_PREKEY_TABLENAME + "("
 107			+ SQLiteAxolotlStore.ACCOUNT + " TEXT,  "
 108			+ SQLiteAxolotlStore.ID + " INTEGER, "
 109			+ SQLiteAxolotlStore.KEY + " TEXT, FOREIGN KEY("
 110			+ SQLiteAxolotlStore.ACCOUNT
 111			+ ") REFERENCES " + Account.TABLENAME + "(" + Account.UUID + ") ON DELETE CASCADE, "
 112			+ "UNIQUE( " + SQLiteAxolotlStore.ACCOUNT + ", "
 113			+ SQLiteAxolotlStore.ID
 114			+ ") ON CONFLICT REPLACE" +
 115			");";
 116
 117	private static String CREATE_SESSIONS_STATEMENT = "CREATE TABLE "
 118			+ SQLiteAxolotlStore.SESSION_TABLENAME + "("
 119			+ SQLiteAxolotlStore.ACCOUNT + " TEXT,  "
 120			+ SQLiteAxolotlStore.NAME + " TEXT, "
 121			+ SQLiteAxolotlStore.DEVICE_ID + " INTEGER, "
 122			+ SQLiteAxolotlStore.KEY + " TEXT, FOREIGN KEY("
 123			+ SQLiteAxolotlStore.ACCOUNT
 124			+ ") REFERENCES " + Account.TABLENAME + "(" + Account.UUID + ") ON DELETE CASCADE, "
 125			+ "UNIQUE( " + SQLiteAxolotlStore.ACCOUNT + ", "
 126			+ SQLiteAxolotlStore.NAME + ", "
 127			+ SQLiteAxolotlStore.DEVICE_ID
 128			+ ") ON CONFLICT REPLACE"
 129			+ ");";
 130
 131	private static String CREATE_IDENTITIES_STATEMENT = "CREATE TABLE "
 132			+ SQLiteAxolotlStore.IDENTITIES_TABLENAME + "("
 133			+ SQLiteAxolotlStore.ACCOUNT + " TEXT,  "
 134			+ SQLiteAxolotlStore.NAME + " TEXT, "
 135			+ SQLiteAxolotlStore.OWN + " INTEGER, "
 136			+ SQLiteAxolotlStore.FINGERPRINT + " TEXT, "
 137			+ SQLiteAxolotlStore.CERTIFICATE + " BLOB, "
 138			+ SQLiteAxolotlStore.TRUST + " TEXT, "
 139			+ SQLiteAxolotlStore.ACTIVE + " NUMBER, "
 140			+ SQLiteAxolotlStore.LAST_ACTIVATION + " NUMBER,"
 141			+ SQLiteAxolotlStore.KEY + " TEXT, FOREIGN KEY("
 142			+ SQLiteAxolotlStore.ACCOUNT
 143			+ ") REFERENCES " + Account.TABLENAME + "(" + Account.UUID + ") ON DELETE CASCADE, "
 144			+ "UNIQUE( " + SQLiteAxolotlStore.ACCOUNT + ", "
 145			+ SQLiteAxolotlStore.NAME + ", "
 146			+ SQLiteAxolotlStore.FINGERPRINT
 147			+ ") ON CONFLICT IGNORE"
 148			+ ");";
 149
 150	private static String START_TIMES_TABLE = "start_times";
 151
 152	private static String CREATE_START_TIMES_TABLE = "create table "+START_TIMES_TABLE+" (timestamp NUMBER);";
 153
 154	private static String CREATE_MESSAGE_TIME_INDEX = "create INDEX message_time_index ON "+Message.TABLENAME+"("+Message.TIME_SENT+")";
 155	private static String CREATE_MESSAGE_CONVERSATION_INDEX = "create INDEX message_conversation_index ON "+Message.TABLENAME+"("+Message.CONVERSATION+")";
 156
 157	private DatabaseBackend(Context context) {
 158		super(context, DATABASE_NAME, null, DATABASE_VERSION);
 159	}
 160
 161	@Override
 162	public void onCreate(SQLiteDatabase db) {
 163		db.execSQL("PRAGMA foreign_keys=ON;");
 164		db.execSQL("create table " + Account.TABLENAME + "(" + Account.UUID+ " TEXT PRIMARY KEY,"
 165				+ Account.USERNAME + " TEXT,"
 166				+ Account.SERVER + " TEXT,"
 167				+ Account.PASSWORD + " TEXT,"
 168				+ Account.DISPLAY_NAME + " TEXT, "
 169				+ Account.STATUS + " TEXT,"
 170				+ Account.STATUS_MESSAGE + " TEXT,"
 171				+ Account.ROSTERVERSION + " TEXT,"
 172				+ Account.OPTIONS + " NUMBER, "
 173				+ Account.AVATAR + " TEXT, "
 174				+ Account.KEYS + " TEXT, "
 175				+ Account.HOSTNAME + " TEXT, "
 176				+ Account.PORT + " NUMBER DEFAULT 5222)");
 177		db.execSQL("create table " + Conversation.TABLENAME + " ("
 178				+ Conversation.UUID + " TEXT PRIMARY KEY, " + Conversation.NAME
 179				+ " TEXT, " + Conversation.CONTACT + " TEXT, "
 180				+ Conversation.ACCOUNT + " TEXT, " + Conversation.CONTACTJID
 181				+ " TEXT, " + Conversation.CREATED + " NUMBER, "
 182				+ Conversation.STATUS + " NUMBER, " + Conversation.MODE
 183				+ " NUMBER, " + Conversation.ATTRIBUTES + " TEXT, FOREIGN KEY("
 184				+ Conversation.ACCOUNT + ") REFERENCES " + Account.TABLENAME
 185				+ "(" + Account.UUID + ") ON DELETE CASCADE);");
 186		db.execSQL("create table " + Message.TABLENAME + "( " + Message.UUID
 187				+ " TEXT PRIMARY KEY, " + Message.CONVERSATION + " TEXT, "
 188				+ Message.TIME_SENT + " NUMBER, " + Message.COUNTERPART
 189				+ " TEXT, " + Message.TRUE_COUNTERPART + " TEXT,"
 190				+ Message.BODY + " TEXT, " + Message.ENCRYPTION + " NUMBER, "
 191				+ Message.STATUS + " NUMBER," + Message.TYPE + " NUMBER, "
 192				+ Message.RELATIVE_FILE_PATH + " TEXT, "
 193				+ Message.SERVER_MSG_ID + " TEXT, "
 194				+ Message.FINGERPRINT + " TEXT, "
 195				+ Message.CARBON + " INTEGER, "
 196				+ Message.EDITED + " TEXT, "
 197				+ Message.READ + " NUMBER DEFAULT 1, "
 198				+ Message.OOB + " INTEGER, "
 199				+ Message.ERROR_MESSAGE + " TEXT,"
 200				+ Message.READ_BY_MARKERS + " TEXT,"
 201				+ Message.MARKABLE + " NUMBER DEFAULT 0,"
 202				+ Message.REMOTE_MSG_ID + " TEXT, FOREIGN KEY("
 203				+ Message.CONVERSATION + ") REFERENCES "
 204				+ Conversation.TABLENAME + "(" + Conversation.UUID
 205				+ ") ON DELETE CASCADE);");
 206		db.execSQL(CREATE_MESSAGE_TIME_INDEX);
 207		db.execSQL(CREATE_MESSAGE_CONVERSATION_INDEX);
 208		db.execSQL(CREATE_CONTATCS_STATEMENT);
 209		db.execSQL(CREATE_DISCOVERY_RESULTS_STATEMENT);
 210		db.execSQL(CREATE_SESSIONS_STATEMENT);
 211		db.execSQL(CREATE_PREKEYS_STATEMENT);
 212		db.execSQL(CREATE_SIGNED_PREKEYS_STATEMENT);
 213		db.execSQL(CREATE_IDENTITIES_STATEMENT);
 214		db.execSQL(CREATE_PRESENCE_TEMPLATES_STATEMENT);
 215		db.execSQL(CREATE_START_TIMES_TABLE);
 216	}
 217
 218	@Override
 219	public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
 220		if (oldVersion < 2 && newVersion >= 2) {
 221			db.execSQL("update " + Account.TABLENAME + " set "
 222					+ Account.OPTIONS + " = " + Account.OPTIONS + " | 8");
 223		}
 224		if (oldVersion < 3 && newVersion >= 3) {
 225			db.execSQL("ALTER TABLE " + Message.TABLENAME + " ADD COLUMN "
 226					+ Message.TYPE + " NUMBER");
 227		}
 228		if (oldVersion < 5 && newVersion >= 5) {
 229			db.execSQL("DROP TABLE " + Contact.TABLENAME);
 230			db.execSQL(CREATE_CONTATCS_STATEMENT);
 231			db.execSQL("UPDATE " + Account.TABLENAME + " SET "
 232					+ Account.ROSTERVERSION + " = NULL");
 233		}
 234		if (oldVersion < 6 && newVersion >= 6) {
 235			db.execSQL("ALTER TABLE " + Message.TABLENAME + " ADD COLUMN "
 236					+ Message.TRUE_COUNTERPART + " TEXT");
 237		}
 238		if (oldVersion < 7 && newVersion >= 7) {
 239			db.execSQL("ALTER TABLE " + Message.TABLENAME + " ADD COLUMN "
 240					+ Message.REMOTE_MSG_ID + " TEXT");
 241			db.execSQL("ALTER TABLE " + Contact.TABLENAME + " ADD COLUMN "
 242					+ Contact.AVATAR + " TEXT");
 243			db.execSQL("ALTER TABLE " + Account.TABLENAME + " ADD COLUMN "
 244					+ Account.AVATAR + " TEXT");
 245		}
 246		if (oldVersion < 8 && newVersion >= 8) {
 247			db.execSQL("ALTER TABLE " + Conversation.TABLENAME + " ADD COLUMN "
 248					+ Conversation.ATTRIBUTES + " TEXT");
 249		}
 250		if (oldVersion < 9 && newVersion >= 9) {
 251			db.execSQL("ALTER TABLE " + Contact.TABLENAME + " ADD COLUMN "
 252					+ Contact.LAST_TIME + " NUMBER");
 253			db.execSQL("ALTER TABLE " + Contact.TABLENAME + " ADD COLUMN "
 254					+ Contact.LAST_PRESENCE + " TEXT");
 255		}
 256		if (oldVersion < 10 && newVersion >= 10) {
 257			db.execSQL("ALTER TABLE " + Message.TABLENAME + " ADD COLUMN "
 258					+ Message.RELATIVE_FILE_PATH + " TEXT");
 259		}
 260		if (oldVersion < 11 && newVersion >= 11) {
 261			db.execSQL("ALTER TABLE " + Contact.TABLENAME + " ADD COLUMN "
 262					+ Contact.GROUPS + " TEXT");
 263			db.execSQL("delete from " + Contact.TABLENAME);
 264			db.execSQL("update " + Account.TABLENAME + " set " + Account.ROSTERVERSION + " = NULL");
 265		}
 266		if (oldVersion < 12 && newVersion >= 12) {
 267			db.execSQL("ALTER TABLE " + Message.TABLENAME + " ADD COLUMN "
 268					+ Message.SERVER_MSG_ID + " TEXT");
 269		}
 270		if (oldVersion < 13 && newVersion >= 13) {
 271			db.execSQL("delete from " + Contact.TABLENAME);
 272			db.execSQL("update " + Account.TABLENAME + " set " + Account.ROSTERVERSION + " = NULL");
 273		}
 274		if (oldVersion < 14 && newVersion >= 14) {
 275			canonicalizeJids(db);
 276		}
 277		if (oldVersion < 15 && newVersion >= 15) {
 278			recreateAxolotlDb(db);
 279			db.execSQL("ALTER TABLE " + Message.TABLENAME + " ADD COLUMN "
 280					+ Message.FINGERPRINT + " TEXT");
 281		}
 282		if (oldVersion < 16 && newVersion >= 16) {
 283			db.execSQL("ALTER TABLE " + Message.TABLENAME + " ADD COLUMN "
 284					+ Message.CARBON + " INTEGER");
 285		}
 286		if (oldVersion < 19 && newVersion >= 19) {
 287			db.execSQL("ALTER TABLE " + Account.TABLENAME + " ADD COLUMN " + Account.DISPLAY_NAME + " TEXT");
 288		}
 289		if (oldVersion < 20 && newVersion >= 20) {
 290			db.execSQL("ALTER TABLE " + Account.TABLENAME + " ADD COLUMN " + Account.HOSTNAME + " TEXT");
 291			db.execSQL("ALTER TABLE " + Account.TABLENAME + " ADD COLUMN " + Account.PORT + " NUMBER DEFAULT 5222");
 292		}
 293		if (oldVersion < 26 && newVersion >= 26) {
 294			db.execSQL("ALTER TABLE " + Account.TABLENAME + " ADD COLUMN " + Account.STATUS + " TEXT");
 295			db.execSQL("ALTER TABLE " + Account.TABLENAME + " ADD COLUMN " + Account.STATUS_MESSAGE + " TEXT");
 296		}
 297		/* Any migrations that alter the Account table need to happen BEFORE this migration, as it
 298		 * depends on account de-serialization.
 299		 */
 300		if (oldVersion < 17 && newVersion >= 17 && newVersion < 31) {
 301			List<Account> accounts = getAccounts(db);
 302			for (Account account : accounts) {
 303				String ownDeviceIdString = account.getKey(SQLiteAxolotlStore.JSONKEY_REGISTRATION_ID);
 304				if (ownDeviceIdString == null) {
 305					continue;
 306				}
 307				int ownDeviceId = Integer.valueOf(ownDeviceIdString);
 308				SignalProtocolAddress ownAddress = new SignalProtocolAddress(account.getJid().toBareJid().toPreppedString(), ownDeviceId);
 309				deleteSession(db, account, ownAddress);
 310				IdentityKeyPair identityKeyPair = loadOwnIdentityKeyPair(db, account);
 311				if (identityKeyPair != null) {
 312					String[] selectionArgs = {
 313							account.getUuid(),
 314							CryptoHelper.bytesToHex(identityKeyPair.getPublicKey().serialize())
 315					};
 316					ContentValues values = new ContentValues();
 317					values.put(SQLiteAxolotlStore.TRUSTED, 2);
 318					db.update(SQLiteAxolotlStore.IDENTITIES_TABLENAME, values,
 319							SQLiteAxolotlStore.ACCOUNT + " = ? AND "
 320									+ SQLiteAxolotlStore.FINGERPRINT + " = ? ",
 321							selectionArgs);
 322				} else {
 323					Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": could not load own identity key pair");
 324				}
 325			}
 326		}
 327		if (oldVersion < 18 && newVersion >= 18) {
 328			db.execSQL("ALTER TABLE " + Message.TABLENAME + " ADD COLUMN " + Message.READ + " NUMBER DEFAULT 1");
 329		}
 330
 331		if (oldVersion < 21 && newVersion >= 21) {
 332			List<Account> accounts = getAccounts(db);
 333			for (Account account : accounts) {
 334				account.unsetPgpSignature();
 335				db.update(Account.TABLENAME, account.getContentValues(), Account.UUID
 336						+ "=?", new String[]{account.getUuid()});
 337			}
 338		}
 339
 340		if (oldVersion >= 15 && oldVersion < 22 && newVersion >= 22) {
 341			db.execSQL("ALTER TABLE " + SQLiteAxolotlStore.IDENTITIES_TABLENAME + " ADD COLUMN " + SQLiteAxolotlStore.CERTIFICATE);
 342		}
 343
 344		if (oldVersion < 23 && newVersion >= 23) {
 345			db.execSQL(CREATE_DISCOVERY_RESULTS_STATEMENT);
 346		}
 347
 348		if (oldVersion < 24 && newVersion >= 24) {
 349			db.execSQL("ALTER TABLE " + Message.TABLENAME + " ADD COLUMN " + Message.EDITED + " TEXT");
 350		}
 351
 352		if (oldVersion < 25 && newVersion >= 25) {
 353			db.execSQL("ALTER TABLE " + Message.TABLENAME + " ADD COLUMN " + Message.OOB + " INTEGER");
 354		}
 355
 356		if (oldVersion <  26 && newVersion >= 26) {
 357			db.execSQL(CREATE_PRESENCE_TEMPLATES_STATEMENT);
 358		}
 359
 360		if (oldVersion < 27 && newVersion >= 27) {
 361			db.execSQL("DELETE FROM "+ServiceDiscoveryResult.TABLENAME);
 362		}
 363
 364		if (oldVersion < 28 && newVersion >= 28) {
 365			canonicalizeJids(db);
 366		}
 367
 368		if (oldVersion < 29 && newVersion >= 29) {
 369			db.execSQL("ALTER TABLE " + Message.TABLENAME + " ADD COLUMN " + Message.ERROR_MESSAGE + " TEXT");
 370		}
 371		if (oldVersion < 30 && newVersion >= 30) {
 372			db.execSQL(CREATE_START_TIMES_TABLE);
 373		}
 374		if (oldVersion >= 15 && oldVersion < 31 && newVersion >= 31) {
 375			db.execSQL("ALTER TABLE "+ SQLiteAxolotlStore.IDENTITIES_TABLENAME + " ADD COLUMN "+SQLiteAxolotlStore.TRUST + " TEXT");
 376			db.execSQL("ALTER TABLE "+ SQLiteAxolotlStore.IDENTITIES_TABLENAME + " ADD COLUMN "+SQLiteAxolotlStore.ACTIVE + " NUMBER");
 377			HashMap<Integer,ContentValues> migration = new HashMap<>();
 378			migration.put(0,createFingerprintStatusContentValues(FingerprintStatus.Trust.TRUSTED,true));
 379			migration.put(1,createFingerprintStatusContentValues(FingerprintStatus.Trust.TRUSTED, true));
 380			migration.put(2,createFingerprintStatusContentValues(FingerprintStatus.Trust.UNTRUSTED, true));
 381			migration.put(3,createFingerprintStatusContentValues(FingerprintStatus.Trust.COMPROMISED, false));
 382			migration.put(4,createFingerprintStatusContentValues(FingerprintStatus.Trust.TRUSTED, false));
 383			migration.put(5,createFingerprintStatusContentValues(FingerprintStatus.Trust.TRUSTED, false));
 384			migration.put(6,createFingerprintStatusContentValues(FingerprintStatus.Trust.UNTRUSTED, false));
 385			migration.put(7,createFingerprintStatusContentValues(FingerprintStatus.Trust.VERIFIED_X509, true));
 386			migration.put(8,createFingerprintStatusContentValues(FingerprintStatus.Trust.VERIFIED_X509, false));
 387			for(Map.Entry<Integer,ContentValues> entry : migration.entrySet()) {
 388				String whereClause = SQLiteAxolotlStore.TRUSTED+"=?";
 389				String[] where = {String.valueOf(entry.getKey())};
 390				db.update(SQLiteAxolotlStore.IDENTITIES_TABLENAME,entry.getValue(),whereClause,where);
 391			}
 392
 393		}
 394		if (oldVersion >= 15 && oldVersion < 32 && newVersion >= 32) {
 395			db.execSQL("ALTER TABLE "+ SQLiteAxolotlStore.IDENTITIES_TABLENAME + " ADD COLUMN "+SQLiteAxolotlStore.LAST_ACTIVATION + " NUMBER");
 396			ContentValues defaults = new ContentValues();
 397			defaults.put(SQLiteAxolotlStore.LAST_ACTIVATION,System.currentTimeMillis());
 398			db.update(SQLiteAxolotlStore.IDENTITIES_TABLENAME,defaults,null,null);
 399		}
 400		if (oldVersion >= 15 && oldVersion < 33 && newVersion >= 33) {
 401			String whereClause = SQLiteAxolotlStore.OWN+"=1";
 402			db.update(SQLiteAxolotlStore.IDENTITIES_TABLENAME,createFingerprintStatusContentValues(FingerprintStatus.Trust.VERIFIED,true),whereClause,null);
 403		}
 404
 405		if (oldVersion < 34 && newVersion >= 34) {
 406			db.execSQL(CREATE_MESSAGE_TIME_INDEX);
 407
 408			final File oldPicturesDirectory = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES)+"/Conversations/");
 409			final File oldFilesDirectory = new File(Environment.getExternalStorageDirectory() + "/Conversations/");
 410			final File newFilesDirectory = new File(Environment.getExternalStorageDirectory() + "/Conversations/Media/Conversations Files/");
 411			final File newVideosDirectory = new File(Environment.getExternalStorageDirectory() + "/Conversations/Media/Conversations Videos/");
 412			if (oldPicturesDirectory.exists() && oldPicturesDirectory.isDirectory()) {
 413				final File newPicturesDirectory = new File(Environment.getExternalStorageDirectory() + "/Conversations/Media/Conversations Images/");
 414				newPicturesDirectory.getParentFile().mkdirs();
 415				if (oldPicturesDirectory.renameTo(newPicturesDirectory)) {
 416					Log.d(Config.LOGTAG,"moved "+oldPicturesDirectory.getAbsolutePath()+" to "+newPicturesDirectory.getAbsolutePath());
 417				}
 418			}
 419			if (oldFilesDirectory.exists() && oldFilesDirectory.isDirectory()) {
 420				newFilesDirectory.mkdirs();
 421				newVideosDirectory.mkdirs();
 422				final File[] files = oldFilesDirectory.listFiles();
 423				if (files == null) {
 424					return;
 425				}
 426				for(File file : files) {
 427					if (file.getName().equals(".nomedia")) {
 428						if (file.delete()) {
 429							Log.d(Config.LOGTAG,"deleted nomedia file in "+oldFilesDirectory.getAbsolutePath());
 430						}
 431					} else if (file.isFile()) {
 432						final String name = file.getName();
 433						boolean isVideo = false;
 434						int start = name.lastIndexOf('.') + 1;
 435						if (start < name.length()) {
 436							String mime=  MimeUtils.guessMimeTypeFromExtension(name.substring(start));
 437							isVideo = mime != null && mime.startsWith("video/");
 438						}
 439						File dst = new File((isVideo ? newVideosDirectory : newFilesDirectory).getAbsolutePath()+"/"+file.getName());
 440						if (file.renameTo(dst)) {
 441							Log.d(Config.LOGTAG, "moved " + file + " to " + dst);
 442						}
 443					}
 444				}
 445			}
 446		}
 447		if (oldVersion < 35 && newVersion >= 35) {
 448			db.execSQL(CREATE_MESSAGE_CONVERSATION_INDEX);
 449		}
 450		if (oldVersion < 36 && newVersion >= 36) {
 451			List<Account> accounts = getAccounts(db);
 452			for (Account account : accounts) {
 453				account.setOption(Account.OPTION_REQUIRES_ACCESS_MODE_CHANGE,true);
 454				account.setOption(Account.OPTION_LOGGED_IN_SUCCESSFULLY,false);
 455				db.update(Account.TABLENAME, account.getContentValues(), Account.UUID
 456						+ "=?", new String[]{account.getUuid()});
 457			}
 458		}
 459
 460		if (oldVersion < 37 && newVersion >= 37) {
 461			db.execSQL("ALTER TABLE " + Message.TABLENAME + " ADD COLUMN " + Message.READ_BY_MARKERS + " TEXT");
 462		}
 463
 464		if (oldVersion < 38 && newVersion >= 38) {
 465			db.execSQL("ALTER TABLE " + Message.TABLENAME + " ADD COLUMN " + Message.MARKABLE + " NUMBER DEFAULT 0");
 466		}
 467	}
 468
 469	private static ContentValues createFingerprintStatusContentValues(FingerprintStatus.Trust trust, boolean active) {
 470		ContentValues values = new ContentValues();
 471		values.put(SQLiteAxolotlStore.TRUST,trust.toString());
 472		values.put(SQLiteAxolotlStore.ACTIVE,active ? 1 : 0);
 473		return values;
 474	}
 475
 476	private void canonicalizeJids(SQLiteDatabase db) {
 477		// migrate db to new, canonicalized JID domainpart representation
 478
 479		// Conversation table
 480		Cursor cursor = db.rawQuery("select * from " + Conversation.TABLENAME, new String[0]);
 481		while (cursor.moveToNext()) {
 482			String newJid;
 483			try {
 484				newJid = Jid.fromString(
 485						cursor.getString(cursor.getColumnIndex(Conversation.CONTACTJID))
 486				).toPreppedString();
 487			} catch (InvalidJidException ignored) {
 488				Log.e(Config.LOGTAG, "Failed to migrate Conversation CONTACTJID "
 489						+ cursor.getString(cursor.getColumnIndex(Conversation.CONTACTJID))
 490						+ ": " + ignored + ". Skipping...");
 491				continue;
 492			}
 493
 494			String updateArgs[] = {
 495					newJid,
 496					cursor.getString(cursor.getColumnIndex(Conversation.UUID)),
 497			};
 498			db.execSQL("update " + Conversation.TABLENAME
 499					+ " set " + Conversation.CONTACTJID + " = ? "
 500					+ " where " + Conversation.UUID + " = ?", updateArgs);
 501		}
 502		cursor.close();
 503
 504		// Contact table
 505		cursor = db.rawQuery("select * from " + Contact.TABLENAME, new String[0]);
 506		while (cursor.moveToNext()) {
 507			String newJid;
 508			try {
 509				newJid = Jid.fromString(
 510						cursor.getString(cursor.getColumnIndex(Contact.JID))
 511				).toPreppedString();
 512			} catch (InvalidJidException ignored) {
 513				Log.e(Config.LOGTAG, "Failed to migrate Contact JID "
 514						+ cursor.getString(cursor.getColumnIndex(Contact.JID))
 515						+ ": " + ignored + ". Skipping...");
 516				continue;
 517			}
 518
 519			String updateArgs[] = {
 520					newJid,
 521					cursor.getString(cursor.getColumnIndex(Contact.ACCOUNT)),
 522					cursor.getString(cursor.getColumnIndex(Contact.JID)),
 523			};
 524			db.execSQL("update " + Contact.TABLENAME
 525					+ " set " + Contact.JID + " = ? "
 526					+ " where " + Contact.ACCOUNT + " = ? "
 527					+ " AND " + Contact.JID + " = ?", updateArgs);
 528		}
 529		cursor.close();
 530
 531		// Account table
 532		cursor = db.rawQuery("select * from " + Account.TABLENAME, new String[0]);
 533		while (cursor.moveToNext()) {
 534			String newServer;
 535			try {
 536				newServer = Jid.fromParts(
 537						cursor.getString(cursor.getColumnIndex(Account.USERNAME)),
 538						cursor.getString(cursor.getColumnIndex(Account.SERVER)),
 539						"mobile"
 540				).getDomainpart();
 541			} catch (InvalidJidException ignored) {
 542				Log.e(Config.LOGTAG, "Failed to migrate Account SERVER "
 543						+ cursor.getString(cursor.getColumnIndex(Account.SERVER))
 544						+ ": " + ignored + ". Skipping...");
 545				continue;
 546			}
 547
 548			String updateArgs[] = {
 549					newServer,
 550					cursor.getString(cursor.getColumnIndex(Account.UUID)),
 551			};
 552			db.execSQL("update " + Account.TABLENAME
 553					+ " set " + Account.SERVER + " = ? "
 554					+ " where " + Account.UUID + " = ?", updateArgs);
 555		}
 556		cursor.close();
 557	}
 558
 559	public static synchronized DatabaseBackend getInstance(Context context) {
 560		if (instance == null) {
 561			instance = new DatabaseBackend(context);
 562		}
 563		return instance;
 564	}
 565
 566	public void createConversation(Conversation conversation) {
 567		SQLiteDatabase db = this.getWritableDatabase();
 568		db.insert(Conversation.TABLENAME, null, conversation.getContentValues());
 569	}
 570
 571	public void createMessage(Message message) {
 572		SQLiteDatabase db = this.getWritableDatabase();
 573		db.insert(Message.TABLENAME, null, message.getContentValues());
 574	}
 575
 576	public void createAccount(Account account) {
 577		SQLiteDatabase db = this.getWritableDatabase();
 578		db.insert(Account.TABLENAME, null, account.getContentValues());
 579	}
 580
 581	public void insertDiscoveryResult(ServiceDiscoveryResult result) {
 582		SQLiteDatabase db = this.getWritableDatabase();
 583		db.insert(ServiceDiscoveryResult.TABLENAME, null, result.getContentValues());
 584	}
 585
 586	public ServiceDiscoveryResult findDiscoveryResult(final String hash, final String ver) {
 587		SQLiteDatabase db = this.getReadableDatabase();
 588		String[] selectionArgs = {hash, ver};
 589		Cursor cursor = db.query(ServiceDiscoveryResult.TABLENAME, null,
 590				ServiceDiscoveryResult.HASH + "=? AND " + ServiceDiscoveryResult.VER + "=?",
 591				selectionArgs, null, null, null);
 592		if (cursor.getCount() == 0) {
 593			cursor.close();
 594			return null;
 595		}
 596		cursor.moveToFirst();
 597
 598		ServiceDiscoveryResult result = null;
 599		try {
 600			result = new ServiceDiscoveryResult(cursor);
 601		} catch (JSONException e) { /* result is still null */ }
 602
 603		cursor.close();
 604		return result;
 605	}
 606
 607	public void insertPresenceTemplate(PresenceTemplate template) {
 608		SQLiteDatabase db = this.getWritableDatabase();
 609		db.insert(PresenceTemplate.TABELNAME, null, template.getContentValues());
 610	}
 611
 612	public List<PresenceTemplate> getPresenceTemplates() {
 613		ArrayList<PresenceTemplate> templates = new ArrayList<>();
 614		SQLiteDatabase db = this.getReadableDatabase();
 615		Cursor cursor = db.query(PresenceTemplate.TABELNAME,null,null,null,null,null,PresenceTemplate.LAST_USED+" desc");
 616		while (cursor.moveToNext()) {
 617			templates.add(PresenceTemplate.fromCursor(cursor));
 618		}
 619		cursor.close();
 620		return templates;
 621	}
 622
 623	public void deletePresenceTemplate(PresenceTemplate template) {
 624		Log.d(Config.LOGTAG,"deleting presence template with uuid "+template.getUuid());
 625		SQLiteDatabase db = this.getWritableDatabase();
 626		String where = PresenceTemplate.UUID+"=?";
 627		String[] whereArgs = {template.getUuid()};
 628		db.delete(PresenceTemplate.TABELNAME,where,whereArgs);
 629	}
 630
 631	public CopyOnWriteArrayList<Conversation> getConversations(int status) {
 632		CopyOnWriteArrayList<Conversation> list = new CopyOnWriteArrayList<>();
 633		SQLiteDatabase db = this.getReadableDatabase();
 634		String[] selectionArgs = {Integer.toString(status)};
 635		Cursor cursor = db.rawQuery("select * from " + Conversation.TABLENAME
 636				+ " where " + Conversation.STATUS + " = ? order by "
 637				+ Conversation.CREATED + " desc", selectionArgs);
 638		while (cursor.moveToNext()) {
 639			list.add(Conversation.fromCursor(cursor));
 640		}
 641		cursor.close();
 642		return list;
 643	}
 644
 645	public ArrayList<Message> getMessages(Conversation conversations, int limit) {
 646		return getMessages(conversations, limit, -1);
 647	}
 648
 649	public ArrayList<Message> getMessages(Conversation conversation, int limit,
 650										  long timestamp) {
 651		ArrayList<Message> list = new ArrayList<>();
 652		SQLiteDatabase db = this.getReadableDatabase();
 653		Cursor cursor;
 654		if (timestamp == -1) {
 655			String[] selectionArgs = {conversation.getUuid()};
 656			cursor = db.query(Message.TABLENAME, null, Message.CONVERSATION
 657					+ "=?", selectionArgs, null, null, Message.TIME_SENT
 658					+ " DESC", String.valueOf(limit));
 659		} else {
 660			String[] selectionArgs = {conversation.getUuid(),
 661					Long.toString(timestamp)};
 662			cursor = db.query(Message.TABLENAME, null, Message.CONVERSATION
 663							+ "=? and " + Message.TIME_SENT + "<?", selectionArgs,
 664					null, null, Message.TIME_SENT + " DESC",
 665					String.valueOf(limit));
 666		}
 667		if (cursor.getCount() > 0) {
 668			cursor.moveToLast();
 669			do {
 670				Message message = Message.fromCursor(cursor,conversation);
 671				if (message != null) {
 672					list.add(message);
 673				}
 674			} while (cursor.moveToPrevious());
 675		}
 676		cursor.close();
 677		return list;
 678	}
 679
 680	public Iterable<Message> getMessagesIterable(final Conversation conversation) {
 681		return new Iterable<Message>() {
 682			@Override
 683			public Iterator<Message> iterator() {
 684				class MessageIterator implements Iterator<Message> {
 685					SQLiteDatabase db = getReadableDatabase();
 686					String[] selectionArgs = {conversation.getUuid()};
 687					Cursor cursor = db.query(Message.TABLENAME, null, Message.CONVERSATION
 688							+ "=?", selectionArgs, null, null, Message.TIME_SENT
 689							+ " ASC", null);
 690
 691					public MessageIterator() {
 692						cursor.moveToFirst();
 693					}
 694
 695					@Override
 696					public boolean hasNext() {
 697						return !cursor.isAfterLast();
 698					}
 699
 700					@Override
 701					public Message next() {
 702						Message message = Message.fromCursor(cursor, conversation);
 703						cursor.moveToNext();
 704						return message;
 705					}
 706
 707					@Override
 708					public void remove() {
 709						throw new UnsupportedOperationException();
 710					}
 711				}
 712				return new MessageIterator();
 713			}
 714		};
 715	}
 716
 717	public Conversation findConversation(final Account account, final Jid contactJid) {
 718		SQLiteDatabase db = this.getReadableDatabase();
 719		String[] selectionArgs = {account.getUuid(),
 720				contactJid.toBareJid().toPreppedString() + "/%",
 721				contactJid.toBareJid().toPreppedString()
 722		};
 723		Cursor cursor = db.query(Conversation.TABLENAME, null,
 724				Conversation.ACCOUNT + "=? AND (" + Conversation.CONTACTJID
 725						+ " like ? OR " + Conversation.CONTACTJID + "=?)", selectionArgs, null, null, null);
 726		if (cursor.getCount() == 0) {
 727			cursor.close();
 728			return null;
 729		}
 730		cursor.moveToFirst();
 731		Conversation conversation = Conversation.fromCursor(cursor);
 732		cursor.close();
 733		return conversation;
 734	}
 735
 736	public void updateConversation(final Conversation conversation) {
 737		final SQLiteDatabase db = this.getWritableDatabase();
 738		final String[] args = {conversation.getUuid()};
 739		db.update(Conversation.TABLENAME, conversation.getContentValues(),
 740				Conversation.UUID + "=?", args);
 741	}
 742
 743	public List<Account> getAccounts() {
 744		SQLiteDatabase db = this.getReadableDatabase();
 745		return getAccounts(db);
 746	}
 747
 748	private List<Account> getAccounts(SQLiteDatabase db) {
 749		List<Account> list = new ArrayList<>();
 750		Cursor cursor = db.query(Account.TABLENAME, null, null, null, null,
 751				null, null);
 752		while (cursor.moveToNext()) {
 753			list.add(Account.fromCursor(cursor));
 754		}
 755		cursor.close();
 756		return list;
 757	}
 758
 759	public boolean updateAccount(Account account) {
 760		SQLiteDatabase db = this.getWritableDatabase();
 761		String[] args = {account.getUuid()};
 762		final int rows = db.update(Account.TABLENAME, account.getContentValues(), Account.UUID + "=?", args);
 763		return rows == 1;
 764	}
 765
 766	public boolean deleteAccount(Account account) {
 767		SQLiteDatabase db = this.getWritableDatabase();
 768		String[] args = {account.getUuid()};
 769		final int rows = db.delete(Account.TABLENAME, Account.UUID + "=?", args);
 770		return rows == 1;
 771	}
 772
 773	@Override
 774	public SQLiteDatabase getWritableDatabase() {
 775		SQLiteDatabase db = super.getWritableDatabase();
 776		db.execSQL("PRAGMA foreign_keys=ON;");
 777		return db;
 778	}
 779
 780	public void updateMessage(Message message) {
 781		SQLiteDatabase db = this.getWritableDatabase();
 782		String[] args = {message.getUuid()};
 783		db.update(Message.TABLENAME, message.getContentValues(), Message.UUID
 784				+ "=?", args);
 785	}
 786
 787	public void updateMessage(Message message, String uuid) {
 788		SQLiteDatabase db = this.getWritableDatabase();
 789		String[] args = {uuid};
 790		db.update(Message.TABLENAME, message.getContentValues(), Message.UUID
 791				+ "=?", args);
 792	}
 793
 794	public void readRoster(Roster roster) {
 795		SQLiteDatabase db = this.getReadableDatabase();
 796		Cursor cursor;
 797		String args[] = {roster.getAccount().getUuid()};
 798		cursor = db.query(Contact.TABLENAME, null, Contact.ACCOUNT + "=?", args, null, null, null);
 799		while (cursor.moveToNext()) {
 800			roster.initContact(Contact.fromCursor(cursor));
 801		}
 802		cursor.close();
 803	}
 804
 805	public void writeRoster(final Roster roster) {
 806		final Account account = roster.getAccount();
 807		final SQLiteDatabase db = this.getWritableDatabase();
 808		db.beginTransaction();
 809		for (Contact contact : roster.getContacts()) {
 810			if (contact.getOption(Contact.Options.IN_ROSTER)) {
 811				db.insert(Contact.TABLENAME, null, contact.getContentValues());
 812			} else {
 813				String where = Contact.ACCOUNT + "=? AND " + Contact.JID + "=?";
 814				String[] whereArgs = {account.getUuid(), contact.getJid().toPreppedString()};
 815				db.delete(Contact.TABLENAME, where, whereArgs);
 816			}
 817		}
 818		db.setTransactionSuccessful();
 819		db.endTransaction();
 820		account.setRosterVersion(roster.getVersion());
 821		updateAccount(account);
 822	}
 823
 824	public void deleteMessagesInConversation(Conversation conversation) {
 825		SQLiteDatabase db = this.getWritableDatabase();
 826		String[] args = {conversation.getUuid()};
 827		db.delete(Message.TABLENAME, Message.CONVERSATION + "=?", args);
 828	}
 829
 830	public boolean expireOldMessages(long timestamp) {
 831		String where = Message.TIME_SENT+"<?";
 832		String[] whereArgs = {String.valueOf(timestamp)};
 833		SQLiteDatabase db = this.getReadableDatabase();
 834		return db.delete(Message.TABLENAME,where,whereArgs) > 0;
 835	}
 836
 837	public MamReference getLastMessageReceived(Account account) {
 838		Cursor cursor = null;
 839		try {
 840			SQLiteDatabase db = this.getReadableDatabase();
 841			String sql = "select messages.timeSent,messages.serverMsgId from accounts join conversations on accounts.uuid=conversations.accountUuid join messages on conversations.uuid=messages.conversationUuid where accounts.uuid=? and (messages.status=0 or messages.carbon=1 or messages.serverMsgId not null) and conversations.mode=0 order by messages.timesent desc limit 1";
 842			String[] args = {account.getUuid()};
 843			cursor = db.rawQuery(sql, args);
 844			if (cursor.getCount() == 0) {
 845				return null;
 846			} else {
 847				cursor.moveToFirst();
 848				return new MamReference(cursor.getLong(0), cursor.getString(1));
 849			}
 850		} catch (Exception e) {
 851			return null;
 852		} finally {
 853			if (cursor != null) {
 854				cursor.close();
 855			}
 856		}
 857	}
 858
 859	public long getLastTimeFingerprintUsed(Account account, String fingerprint) {
 860		String SQL = "select messages.timeSent from accounts join conversations on accounts.uuid=conversations.accountUuid join messages on conversations.uuid=messages.conversationUuid where accounts.uuid=? and messages.axolotl_fingerprint=? order by messages.timesent desc limit 1";
 861		String[] args = {account.getUuid(), fingerprint};
 862		Cursor cursor = getReadableDatabase().rawQuery(SQL,args);
 863		long time;
 864		if (cursor.moveToFirst()) {
 865			time = cursor.getLong(0);
 866		} else {
 867			time = 0;
 868		}
 869		cursor.close();
 870		return time;
 871	}
 872
 873	public MamReference getLastClearDate(Account account) {
 874		SQLiteDatabase db = this.getReadableDatabase();
 875		String[] columns = {Conversation.ATTRIBUTES};
 876		String selection = Conversation.ACCOUNT + "=?";
 877		String[] args = {account.getUuid()};
 878		Cursor cursor = db.query(Conversation.TABLENAME,columns,selection,args,null,null,null);
 879		MamReference maxClearDate = new MamReference(0);
 880		while (cursor.moveToNext()) {
 881			try {
 882				final JSONObject o = new JSONObject(cursor.getString(0));
 883				maxClearDate = MamReference.max(maxClearDate, MamReference.fromAttribute(o.getString(Conversation.ATTRIBUTE_LAST_CLEAR_HISTORY)));
 884			} catch (Exception e) {
 885				//ignored
 886			}
 887		}
 888		cursor.close();
 889		return maxClearDate;
 890	}
 891
 892	private Cursor getCursorForSession(Account account, SignalProtocolAddress contact) {
 893		final SQLiteDatabase db = this.getReadableDatabase();
 894		String[] selectionArgs = {account.getUuid(),
 895				contact.getName(),
 896				Integer.toString(contact.getDeviceId())};
 897		return db.query(SQLiteAxolotlStore.SESSION_TABLENAME,
 898				null,
 899				SQLiteAxolotlStore.ACCOUNT + " = ? AND "
 900						+ SQLiteAxolotlStore.NAME + " = ? AND "
 901						+ SQLiteAxolotlStore.DEVICE_ID + " = ? ",
 902				selectionArgs,
 903				null, null, null);
 904	}
 905
 906	public SessionRecord loadSession(Account account, SignalProtocolAddress contact) {
 907		SessionRecord session = null;
 908		Cursor cursor = getCursorForSession(account, contact);
 909		if (cursor.getCount() != 0) {
 910			cursor.moveToFirst();
 911			try {
 912				session = new SessionRecord(Base64.decode(cursor.getString(cursor.getColumnIndex(SQLiteAxolotlStore.KEY)), Base64.DEFAULT));
 913			} catch (IOException e) {
 914				cursor.close();
 915				throw new AssertionError(e);
 916			}
 917		}
 918		cursor.close();
 919		return session;
 920	}
 921
 922	public List<Integer> getSubDeviceSessions(Account account, SignalProtocolAddress contact) {
 923		final SQLiteDatabase db = this.getReadableDatabase();
 924		return getSubDeviceSessions(db, account, contact);
 925	}
 926
 927	private List<Integer> getSubDeviceSessions(SQLiteDatabase db, Account account, SignalProtocolAddress contact) {
 928		List<Integer> devices = new ArrayList<>();
 929		String[] columns = {SQLiteAxolotlStore.DEVICE_ID};
 930		String[] selectionArgs = {account.getUuid(),
 931				contact.getName()};
 932		Cursor cursor = db.query(SQLiteAxolotlStore.SESSION_TABLENAME,
 933				columns,
 934				SQLiteAxolotlStore.ACCOUNT + " = ? AND "
 935						+ SQLiteAxolotlStore.NAME + " = ?",
 936				selectionArgs,
 937				null, null, null);
 938
 939		while (cursor.moveToNext()) {
 940			devices.add(cursor.getInt(
 941					cursor.getColumnIndex(SQLiteAxolotlStore.DEVICE_ID)));
 942		}
 943
 944		cursor.close();
 945		return devices;
 946	}
 947
 948	public List<String> getKnownSignalAddresses(Account account) {
 949		List<String> addresses = new ArrayList<>();
 950		String[] colums = {"DISTINCT "+SQLiteAxolotlStore.NAME};
 951		String[] selectionArgs = {account.getUuid()};
 952		Cursor cursor = getReadableDatabase().query(SQLiteAxolotlStore.SESSION_TABLENAME,
 953				colums,
 954				SQLiteAxolotlStore.ACCOUNT + " = ?",
 955				selectionArgs,
 956				null,null,null
 957				);
 958		while (cursor.moveToNext()) {
 959			addresses.add(cursor.getString(0));
 960		}
 961		cursor.close();
 962		return addresses;
 963	}
 964
 965	public boolean containsSession(Account account, SignalProtocolAddress contact) {
 966		Cursor cursor = getCursorForSession(account, contact);
 967		int count = cursor.getCount();
 968		cursor.close();
 969		return count != 0;
 970	}
 971
 972	public void storeSession(Account account, SignalProtocolAddress contact, SessionRecord session) {
 973		SQLiteDatabase db = this.getWritableDatabase();
 974		ContentValues values = new ContentValues();
 975		values.put(SQLiteAxolotlStore.NAME, contact.getName());
 976		values.put(SQLiteAxolotlStore.DEVICE_ID, contact.getDeviceId());
 977		values.put(SQLiteAxolotlStore.KEY, Base64.encodeToString(session.serialize(), Base64.DEFAULT));
 978		values.put(SQLiteAxolotlStore.ACCOUNT, account.getUuid());
 979		db.insert(SQLiteAxolotlStore.SESSION_TABLENAME, null, values);
 980	}
 981
 982	public void deleteSession(Account account, SignalProtocolAddress contact) {
 983		SQLiteDatabase db = this.getWritableDatabase();
 984		deleteSession(db, account, contact);
 985	}
 986
 987	private void deleteSession(SQLiteDatabase db, Account account, SignalProtocolAddress contact) {
 988		String[] args = {account.getUuid(),
 989				contact.getName(),
 990				Integer.toString(contact.getDeviceId())};
 991		db.delete(SQLiteAxolotlStore.SESSION_TABLENAME,
 992				SQLiteAxolotlStore.ACCOUNT + " = ? AND "
 993						+ SQLiteAxolotlStore.NAME + " = ? AND "
 994						+ SQLiteAxolotlStore.DEVICE_ID + " = ? ",
 995				args);
 996	}
 997
 998	public void deleteAllSessions(Account account, SignalProtocolAddress contact) {
 999		SQLiteDatabase db = this.getWritableDatabase();
1000		String[] args = {account.getUuid(), contact.getName()};
1001		db.delete(SQLiteAxolotlStore.SESSION_TABLENAME,
1002				SQLiteAxolotlStore.ACCOUNT + "=? AND "
1003						+ SQLiteAxolotlStore.NAME + " = ?",
1004				args);
1005	}
1006
1007	private Cursor getCursorForPreKey(Account account, int preKeyId) {
1008		SQLiteDatabase db = this.getReadableDatabase();
1009		String[] columns = {SQLiteAxolotlStore.KEY};
1010		String[] selectionArgs = {account.getUuid(), Integer.toString(preKeyId)};
1011		Cursor cursor = db.query(SQLiteAxolotlStore.PREKEY_TABLENAME,
1012				columns,
1013				SQLiteAxolotlStore.ACCOUNT + "=? AND "
1014						+ SQLiteAxolotlStore.ID + "=?",
1015				selectionArgs,
1016				null, null, null);
1017
1018		return cursor;
1019	}
1020
1021	public PreKeyRecord loadPreKey(Account account, int preKeyId) {
1022		PreKeyRecord record = null;
1023		Cursor cursor = getCursorForPreKey(account, preKeyId);
1024		if (cursor.getCount() != 0) {
1025			cursor.moveToFirst();
1026			try {
1027				record = new PreKeyRecord(Base64.decode(cursor.getString(cursor.getColumnIndex(SQLiteAxolotlStore.KEY)), Base64.DEFAULT));
1028			} catch (IOException e) {
1029				throw new AssertionError(e);
1030			}
1031		}
1032		cursor.close();
1033		return record;
1034	}
1035
1036	public boolean containsPreKey(Account account, int preKeyId) {
1037		Cursor cursor = getCursorForPreKey(account, preKeyId);
1038		int count = cursor.getCount();
1039		cursor.close();
1040		return count != 0;
1041	}
1042
1043	public void storePreKey(Account account, PreKeyRecord record) {
1044		SQLiteDatabase db = this.getWritableDatabase();
1045		ContentValues values = new ContentValues();
1046		values.put(SQLiteAxolotlStore.ID, record.getId());
1047		values.put(SQLiteAxolotlStore.KEY, Base64.encodeToString(record.serialize(), Base64.DEFAULT));
1048		values.put(SQLiteAxolotlStore.ACCOUNT, account.getUuid());
1049		db.insert(SQLiteAxolotlStore.PREKEY_TABLENAME, null, values);
1050	}
1051
1052	public void deletePreKey(Account account, int preKeyId) {
1053		SQLiteDatabase db = this.getWritableDatabase();
1054		String[] args = {account.getUuid(), Integer.toString(preKeyId)};
1055		db.delete(SQLiteAxolotlStore.PREKEY_TABLENAME,
1056				SQLiteAxolotlStore.ACCOUNT + "=? AND "
1057						+ SQLiteAxolotlStore.ID + "=?",
1058				args);
1059	}
1060
1061	private Cursor getCursorForSignedPreKey(Account account, int signedPreKeyId) {
1062		SQLiteDatabase db = this.getReadableDatabase();
1063		String[] columns = {SQLiteAxolotlStore.KEY};
1064		String[] selectionArgs = {account.getUuid(), Integer.toString(signedPreKeyId)};
1065		Cursor cursor = db.query(SQLiteAxolotlStore.SIGNED_PREKEY_TABLENAME,
1066				columns,
1067				SQLiteAxolotlStore.ACCOUNT + "=? AND " + SQLiteAxolotlStore.ID + "=?",
1068				selectionArgs,
1069				null, null, null);
1070
1071		return cursor;
1072	}
1073
1074	public SignedPreKeyRecord loadSignedPreKey(Account account, int signedPreKeyId) {
1075		SignedPreKeyRecord record = null;
1076		Cursor cursor = getCursorForSignedPreKey(account, signedPreKeyId);
1077		if (cursor.getCount() != 0) {
1078			cursor.moveToFirst();
1079			try {
1080				record = new SignedPreKeyRecord(Base64.decode(cursor.getString(cursor.getColumnIndex(SQLiteAxolotlStore.KEY)), Base64.DEFAULT));
1081			} catch (IOException e) {
1082				throw new AssertionError(e);
1083			}
1084		}
1085		cursor.close();
1086		return record;
1087	}
1088
1089	public List<SignedPreKeyRecord> loadSignedPreKeys(Account account) {
1090		List<SignedPreKeyRecord> prekeys = new ArrayList<>();
1091		SQLiteDatabase db = this.getReadableDatabase();
1092		String[] columns = {SQLiteAxolotlStore.KEY};
1093		String[] selectionArgs = {account.getUuid()};
1094		Cursor cursor = db.query(SQLiteAxolotlStore.SIGNED_PREKEY_TABLENAME,
1095				columns,
1096				SQLiteAxolotlStore.ACCOUNT + "=?",
1097				selectionArgs,
1098				null, null, null);
1099
1100		while (cursor.moveToNext()) {
1101			try {
1102				prekeys.add(new SignedPreKeyRecord(Base64.decode(cursor.getString(cursor.getColumnIndex(SQLiteAxolotlStore.KEY)), Base64.DEFAULT)));
1103			} catch (IOException ignored) {
1104			}
1105		}
1106		cursor.close();
1107		return prekeys;
1108	}
1109
1110	public int getSignedPreKeysCount(Account account) {
1111		String[] columns = {"count("+SQLiteAxolotlStore.KEY+")"};
1112		String[] selectionArgs = {account.getUuid()};
1113		SQLiteDatabase db = this.getReadableDatabase();
1114		Cursor cursor = db.query(SQLiteAxolotlStore.SIGNED_PREKEY_TABLENAME,
1115				columns,
1116				SQLiteAxolotlStore.ACCOUNT + "=?",
1117				selectionArgs,
1118				null, null, null);
1119		final int count;
1120		if (cursor.moveToFirst()) {
1121			count = cursor.getInt(0);
1122		} else {
1123			count = 0;
1124		}
1125		cursor.close();
1126		return count;
1127	}
1128
1129	public boolean containsSignedPreKey(Account account, int signedPreKeyId) {
1130		Cursor cursor = getCursorForPreKey(account, signedPreKeyId);
1131		int count = cursor.getCount();
1132		cursor.close();
1133		return count != 0;
1134	}
1135
1136	public void storeSignedPreKey(Account account, SignedPreKeyRecord record) {
1137		SQLiteDatabase db = this.getWritableDatabase();
1138		ContentValues values = new ContentValues();
1139		values.put(SQLiteAxolotlStore.ID, record.getId());
1140		values.put(SQLiteAxolotlStore.KEY, Base64.encodeToString(record.serialize(), Base64.DEFAULT));
1141		values.put(SQLiteAxolotlStore.ACCOUNT, account.getUuid());
1142		db.insert(SQLiteAxolotlStore.SIGNED_PREKEY_TABLENAME, null, values);
1143	}
1144
1145	public void deleteSignedPreKey(Account account, int signedPreKeyId) {
1146		SQLiteDatabase db = this.getWritableDatabase();
1147		String[] args = {account.getUuid(), Integer.toString(signedPreKeyId)};
1148		db.delete(SQLiteAxolotlStore.SIGNED_PREKEY_TABLENAME,
1149				SQLiteAxolotlStore.ACCOUNT + "=? AND "
1150						+ SQLiteAxolotlStore.ID + "=?",
1151				args);
1152	}
1153
1154	private Cursor getIdentityKeyCursor(Account account, String name, boolean own) {
1155		final SQLiteDatabase db = this.getReadableDatabase();
1156		return getIdentityKeyCursor(db, account, name, own);
1157	}
1158
1159	private Cursor getIdentityKeyCursor(SQLiteDatabase db, Account account, String name, boolean own) {
1160		return getIdentityKeyCursor(db, account, name, own, null);
1161	}
1162
1163	private Cursor getIdentityKeyCursor(Account account, String fingerprint) {
1164		final SQLiteDatabase db = this.getReadableDatabase();
1165		return getIdentityKeyCursor(db, account, fingerprint);
1166	}
1167
1168	private Cursor getIdentityKeyCursor(SQLiteDatabase db, Account account, String fingerprint) {
1169		return getIdentityKeyCursor(db, account, null, null, fingerprint);
1170	}
1171
1172	private Cursor getIdentityKeyCursor(SQLiteDatabase db, Account account, String name, Boolean own, String fingerprint) {
1173		String[] columns = {SQLiteAxolotlStore.TRUST,
1174				SQLiteAxolotlStore.ACTIVE,
1175				SQLiteAxolotlStore.LAST_ACTIVATION,
1176				SQLiteAxolotlStore.KEY};
1177		ArrayList<String> selectionArgs = new ArrayList<>(4);
1178		selectionArgs.add(account.getUuid());
1179		String selectionString = SQLiteAxolotlStore.ACCOUNT + " = ?";
1180		if (name != null) {
1181			selectionArgs.add(name);
1182			selectionString += " AND " + SQLiteAxolotlStore.NAME + " = ?";
1183		}
1184		if (fingerprint != null) {
1185			selectionArgs.add(fingerprint);
1186			selectionString += " AND " + SQLiteAxolotlStore.FINGERPRINT + " = ?";
1187		}
1188		if (own != null) {
1189			selectionArgs.add(own ? "1" : "0");
1190			selectionString += " AND " + SQLiteAxolotlStore.OWN + " = ?";
1191		}
1192		Cursor cursor = db.query(SQLiteAxolotlStore.IDENTITIES_TABLENAME,
1193				columns,
1194				selectionString,
1195				selectionArgs.toArray(new String[selectionArgs.size()]),
1196				null, null, null);
1197
1198		return cursor;
1199	}
1200
1201	public IdentityKeyPair loadOwnIdentityKeyPair(Account account) {
1202		SQLiteDatabase db = getReadableDatabase();
1203		return loadOwnIdentityKeyPair(db, account);
1204	}
1205
1206	private IdentityKeyPair loadOwnIdentityKeyPair(SQLiteDatabase db, Account account) {
1207		String name = account.getJid().toBareJid().toPreppedString();
1208		IdentityKeyPair identityKeyPair = null;
1209		Cursor cursor = getIdentityKeyCursor(db, account, name, true);
1210		if (cursor.getCount() != 0) {
1211			cursor.moveToFirst();
1212			try {
1213				identityKeyPair = new IdentityKeyPair(Base64.decode(cursor.getString(cursor.getColumnIndex(SQLiteAxolotlStore.KEY)), Base64.DEFAULT));
1214			} catch (InvalidKeyException e) {
1215				Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Encountered invalid IdentityKey in database for account" + account.getJid().toBareJid() + ", address: " + name);
1216			}
1217		}
1218		cursor.close();
1219
1220		return identityKeyPair;
1221	}
1222
1223	public Set<IdentityKey> loadIdentityKeys(Account account, String name) {
1224		return loadIdentityKeys(account, name, null);
1225	}
1226
1227	public Set<IdentityKey> loadIdentityKeys(Account account, String name, FingerprintStatus status) {
1228		Set<IdentityKey> identityKeys = new HashSet<>();
1229		Cursor cursor = getIdentityKeyCursor(account, name, false);
1230
1231		while (cursor.moveToNext()) {
1232			if (status != null && !FingerprintStatus.fromCursor(cursor).equals(status)) {
1233				continue;
1234			}
1235			try {
1236				String key = cursor.getString(cursor.getColumnIndex(SQLiteAxolotlStore.KEY));
1237				if (key != null) {
1238					identityKeys.add(new IdentityKey(Base64.decode(key, Base64.DEFAULT), 0));
1239				} else {
1240					Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Missing key (possibly preverified) in database for account" + account.getJid().toBareJid() + ", address: " + name);
1241				}
1242			} catch (InvalidKeyException e) {
1243				Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Encountered invalid IdentityKey in database for account" + account.getJid().toBareJid() + ", address: " + name);
1244			}
1245		}
1246		cursor.close();
1247
1248		return identityKeys;
1249	}
1250
1251	public long numTrustedKeys(Account account, String name) {
1252		SQLiteDatabase db = getReadableDatabase();
1253		String[] args = {
1254				account.getUuid(),
1255				name,
1256				FingerprintStatus.Trust.TRUSTED.toString(),
1257				FingerprintStatus.Trust.VERIFIED.toString(),
1258				FingerprintStatus.Trust.VERIFIED_X509.toString()
1259		};
1260		return DatabaseUtils.queryNumEntries(db, SQLiteAxolotlStore.IDENTITIES_TABLENAME,
1261				SQLiteAxolotlStore.ACCOUNT + " = ?"
1262						+ " AND " + SQLiteAxolotlStore.NAME + " = ?"
1263						+ " AND (" + SQLiteAxolotlStore.TRUST + " = ? OR " + SQLiteAxolotlStore.TRUST + " = ? OR " +SQLiteAxolotlStore.TRUST +" = ?)"
1264						+ " AND " +SQLiteAxolotlStore.ACTIVE + " > 0",
1265				args
1266		);
1267	}
1268
1269	private void storeIdentityKey(Account account, String name, boolean own, String fingerprint, String base64Serialized, FingerprintStatus status) {
1270		SQLiteDatabase db = this.getWritableDatabase();
1271		ContentValues values = new ContentValues();
1272		values.put(SQLiteAxolotlStore.ACCOUNT, account.getUuid());
1273		values.put(SQLiteAxolotlStore.NAME, name);
1274		values.put(SQLiteAxolotlStore.OWN, own ? 1 : 0);
1275		values.put(SQLiteAxolotlStore.FINGERPRINT, fingerprint);
1276		values.put(SQLiteAxolotlStore.KEY, base64Serialized);
1277		values.putAll(status.toContentValues());
1278		String where = SQLiteAxolotlStore.ACCOUNT+"=? AND "+SQLiteAxolotlStore.NAME+"=? AND "+SQLiteAxolotlStore.FINGERPRINT+" =?";
1279		String[] whereArgs = {account.getUuid(),name,fingerprint};
1280		int rows = db.update(SQLiteAxolotlStore.IDENTITIES_TABLENAME,values,where,whereArgs);
1281		if (rows == 0) {
1282			db.insert(SQLiteAxolotlStore.IDENTITIES_TABLENAME, null, values);
1283		}
1284	}
1285
1286	public void storePreVerification(Account account, String name, String fingerprint, FingerprintStatus status) {
1287		SQLiteDatabase db = this.getWritableDatabase();
1288		ContentValues values = new ContentValues();
1289		values.put(SQLiteAxolotlStore.ACCOUNT, account.getUuid());
1290		values.put(SQLiteAxolotlStore.NAME, name);
1291		values.put(SQLiteAxolotlStore.OWN, 0);
1292		values.put(SQLiteAxolotlStore.FINGERPRINT, fingerprint);
1293		values.putAll(status.toContentValues());
1294		db.insert(SQLiteAxolotlStore.IDENTITIES_TABLENAME, null, values);
1295	}
1296
1297	public FingerprintStatus getFingerprintStatus(Account account, String fingerprint) {
1298		Cursor cursor = getIdentityKeyCursor(account, fingerprint);
1299		final FingerprintStatus status;
1300		if (cursor.getCount() > 0) {
1301			cursor.moveToFirst();
1302			status = FingerprintStatus.fromCursor(cursor);
1303		} else {
1304			status = null;
1305		}
1306		cursor.close();
1307		return status;
1308	}
1309
1310	public boolean setIdentityKeyTrust(Account account, String fingerprint, FingerprintStatus fingerprintStatus) {
1311		SQLiteDatabase db = this.getWritableDatabase();
1312		return setIdentityKeyTrust(db, account, fingerprint, fingerprintStatus);
1313	}
1314
1315	private boolean setIdentityKeyTrust(SQLiteDatabase db, Account account, String fingerprint, FingerprintStatus status) {
1316		String[] selectionArgs = {
1317				account.getUuid(),
1318				fingerprint
1319		};
1320		int rows = db.update(SQLiteAxolotlStore.IDENTITIES_TABLENAME, status.toContentValues(),
1321				SQLiteAxolotlStore.ACCOUNT + " = ? AND "
1322						+ SQLiteAxolotlStore.FINGERPRINT + " = ? ",
1323				selectionArgs);
1324		return rows == 1;
1325	}
1326
1327	public boolean setIdentityKeyCertificate(Account account, String fingerprint, X509Certificate x509Certificate) {
1328		SQLiteDatabase db = this.getWritableDatabase();
1329		String[] selectionArgs = {
1330				account.getUuid(),
1331				fingerprint
1332		};
1333		try {
1334			ContentValues values = new ContentValues();
1335			values.put(SQLiteAxolotlStore.CERTIFICATE, x509Certificate.getEncoded());
1336			return db.update(SQLiteAxolotlStore.IDENTITIES_TABLENAME, values,
1337					SQLiteAxolotlStore.ACCOUNT + " = ? AND "
1338							+ SQLiteAxolotlStore.FINGERPRINT + " = ? ",
1339					selectionArgs) == 1;
1340		} catch (CertificateEncodingException e) {
1341			Log.d(Config.LOGTAG, "could not encode certificate");
1342			return false;
1343		}
1344	}
1345
1346	public X509Certificate getIdentityKeyCertifcate(Account account, String fingerprint) {
1347		SQLiteDatabase db = this.getReadableDatabase();
1348		String[] selectionArgs = {
1349				account.getUuid(),
1350				fingerprint
1351		};
1352		String[] colums = {SQLiteAxolotlStore.CERTIFICATE};
1353		String selection = SQLiteAxolotlStore.ACCOUNT + " = ? AND " + SQLiteAxolotlStore.FINGERPRINT + " = ? ";
1354		Cursor cursor = db.query(SQLiteAxolotlStore.IDENTITIES_TABLENAME, colums, selection, selectionArgs, null, null, null);
1355		if (cursor.getCount() < 1) {
1356			return null;
1357		} else {
1358			cursor.moveToFirst();
1359			byte[] certificate = cursor.getBlob(cursor.getColumnIndex(SQLiteAxolotlStore.CERTIFICATE));
1360			cursor.close();
1361			if (certificate == null || certificate.length == 0) {
1362				return null;
1363			}
1364			try {
1365				CertificateFactory certificateFactory = CertificateFactory.getInstance("X.509");
1366				return (X509Certificate) certificateFactory.generateCertificate(new ByteArrayInputStream(certificate));
1367			} catch (CertificateException e) {
1368				Log.d(Config.LOGTAG,"certificate exception "+e.getMessage());
1369				return null;
1370			}
1371		}
1372	}
1373
1374	public void storeIdentityKey(Account account, String name, IdentityKey identityKey, FingerprintStatus status) {
1375		storeIdentityKey(account, name, false, CryptoHelper.bytesToHex(identityKey.getPublicKey().serialize()), Base64.encodeToString(identityKey.serialize(), Base64.DEFAULT), status);
1376	}
1377
1378	public void storeOwnIdentityKeyPair(Account account, IdentityKeyPair identityKeyPair) {
1379		storeIdentityKey(account, account.getJid().toBareJid().toPreppedString(), true, CryptoHelper.bytesToHex(identityKeyPair.getPublicKey().serialize()), Base64.encodeToString(identityKeyPair.serialize(), Base64.DEFAULT), FingerprintStatus.createActiveVerified(false));
1380	}
1381
1382
1383	private void recreateAxolotlDb(SQLiteDatabase db) {
1384		Log.d(Config.LOGTAG, AxolotlService.LOGPREFIX + " : " + ">>> (RE)CREATING AXOLOTL DATABASE <<<");
1385		db.execSQL("DROP TABLE IF EXISTS " + SQLiteAxolotlStore.SESSION_TABLENAME);
1386		db.execSQL(CREATE_SESSIONS_STATEMENT);
1387		db.execSQL("DROP TABLE IF EXISTS " + SQLiteAxolotlStore.PREKEY_TABLENAME);
1388		db.execSQL(CREATE_PREKEYS_STATEMENT);
1389		db.execSQL("DROP TABLE IF EXISTS " + SQLiteAxolotlStore.SIGNED_PREKEY_TABLENAME);
1390		db.execSQL(CREATE_SIGNED_PREKEYS_STATEMENT);
1391		db.execSQL("DROP TABLE IF EXISTS " + SQLiteAxolotlStore.IDENTITIES_TABLENAME);
1392		db.execSQL(CREATE_IDENTITIES_STATEMENT);
1393	}
1394
1395	public void wipeAxolotlDb(Account account) {
1396		String accountName = account.getUuid();
1397		Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + ">>> WIPING AXOLOTL DATABASE FOR ACCOUNT " + accountName + " <<<");
1398		SQLiteDatabase db = this.getWritableDatabase();
1399		String[] deleteArgs = {
1400				accountName
1401		};
1402		db.delete(SQLiteAxolotlStore.SESSION_TABLENAME,
1403				SQLiteAxolotlStore.ACCOUNT + " = ?",
1404				deleteArgs);
1405		db.delete(SQLiteAxolotlStore.PREKEY_TABLENAME,
1406				SQLiteAxolotlStore.ACCOUNT + " = ?",
1407				deleteArgs);
1408		db.delete(SQLiteAxolotlStore.SIGNED_PREKEY_TABLENAME,
1409				SQLiteAxolotlStore.ACCOUNT + " = ?",
1410				deleteArgs);
1411		db.delete(SQLiteAxolotlStore.IDENTITIES_TABLENAME,
1412				SQLiteAxolotlStore.ACCOUNT + " = ?",
1413				deleteArgs);
1414	}
1415
1416	public List<ShortcutService.FrequentContact> getFrequentContacts(int days) {
1417		SQLiteDatabase db = this.getReadableDatabase();
1418		final String SQL = "select "+Conversation.TABLENAME+"."+Conversation.ACCOUNT+","+Conversation.TABLENAME+"."+Conversation.CONTACTJID+" from "+Conversation.TABLENAME+" join "+Message.TABLENAME+" on conversations.uuid=messages.conversationUuid where messages.status!=0 and carbon==0  and conversations.mode=0 and messages.timeSent>=? group by conversations.uuid order by count(body) desc limit 4;";
1419		String[] whereArgs = new String[]{String.valueOf(System.currentTimeMillis() - (Config.MILLISECONDS_IN_DAY * days))};
1420		Cursor cursor = db.rawQuery(SQL,whereArgs);
1421		ArrayList<ShortcutService.FrequentContact> contacts = new ArrayList<>();
1422		while(cursor.moveToNext()) {
1423			try {
1424				contacts.add(new ShortcutService.FrequentContact(cursor.getString(0), Jid.fromString(cursor.getString(1))));
1425			} catch (Exception e) {
1426				Log.d(Config.LOGTAG,e.getMessage());
1427			}
1428		}
1429		cursor.close();
1430		return contacts;
1431	}
1432}