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