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.Collection;
  32import java.util.HashMap;
  33import java.util.HashSet;
  34import java.util.Iterator;
  35import java.util.List;
  36import java.util.Map;
  37import java.util.Set;
  38import java.util.concurrent.CopyOnWriteArrayList;
  39import org.json.JSONException;
  40
  41import eu.siacs.conversations.Config;
  42import eu.siacs.conversations.crypto.axolotl.AxolotlService;
  43import eu.siacs.conversations.crypto.axolotl.FingerprintStatus;
  44import eu.siacs.conversations.crypto.axolotl.SQLiteAxolotlStore;
  45import eu.siacs.conversations.entities.Account;
  46import eu.siacs.conversations.entities.Contact;
  47import eu.siacs.conversations.entities.Conversation;
  48import eu.siacs.conversations.entities.Message;
  49import eu.siacs.conversations.entities.PresenceTemplate;
  50import eu.siacs.conversations.entities.Roster;
  51import eu.siacs.conversations.entities.ServiceDiscoveryResult;
  52import eu.siacs.conversations.services.ShortcutService;
  53import eu.siacs.conversations.utils.CryptoHelper;
  54import eu.siacs.conversations.utils.MimeUtils;
  55import eu.siacs.conversations.utils.Resolver;
  56import eu.siacs.conversations.xmpp.jid.InvalidJidException;
  57import eu.siacs.conversations.xmpp.jid.Jid;
  58import eu.siacs.conversations.xmpp.mam.MamReference;
  59
  60public class DatabaseBackend extends SQLiteOpenHelper {
  61
  62	private static DatabaseBackend instance = null;
  63
  64	private static final String DATABASE_NAME = "history";
  65	private static final int DATABASE_VERSION = 40;
  66
  67	private static String CREATE_CONTATCS_STATEMENT = "create table "
  68			+ Contact.TABLENAME + "(" + Contact.ACCOUNT + " TEXT, "
  69			+ Contact.SERVERNAME + " TEXT, " + Contact.SYSTEMNAME + " TEXT,"
  70			+ Contact.JID + " TEXT," + Contact.KEYS + " TEXT,"
  71			+ Contact.PHOTOURI + " TEXT," + Contact.OPTIONS + " NUMBER,"
  72			+ Contact.SYSTEMACCOUNT + " NUMBER, " + Contact.AVATAR + " TEXT, "
  73			+ Contact.LAST_PRESENCE + " TEXT, " + Contact.LAST_TIME + " NUMBER, "
  74			+ Contact.GROUPS + " TEXT, FOREIGN KEY(" + Contact.ACCOUNT + ") REFERENCES "
  75			+ Account.TABLENAME + "(" + Account.UUID
  76			+ ") ON DELETE CASCADE, UNIQUE(" + Contact.ACCOUNT + ", "
  77			+ Contact.JID + ") ON CONFLICT REPLACE);";
  78
  79	private static String CREATE_DISCOVERY_RESULTS_STATEMENT = "create table "
  80			+ ServiceDiscoveryResult.TABLENAME + "("
  81			+ ServiceDiscoveryResult.HASH + " TEXT, "
  82			+ ServiceDiscoveryResult.VER + " TEXT, "
  83			+ ServiceDiscoveryResult.RESULT + " TEXT, "
  84			+ "UNIQUE(" + ServiceDiscoveryResult.HASH + ", "
  85			+ ServiceDiscoveryResult.VER + ") ON CONFLICT REPLACE);";
  86
  87	private static String CREATE_PRESENCE_TEMPLATES_STATEMENT = "CREATE TABLE "
  88			+ PresenceTemplate.TABELNAME + "("
  89			+ PresenceTemplate.UUID + " TEXT, "
  90			+ PresenceTemplate.LAST_USED + " NUMBER,"
  91			+ PresenceTemplate.MESSAGE + " TEXT,"
  92			+ PresenceTemplate.STATUS + " TEXT,"
  93			+ "UNIQUE("+PresenceTemplate.MESSAGE + "," +PresenceTemplate.STATUS+") ON CONFLICT REPLACE);";
  94
  95	private static String CREATE_PREKEYS_STATEMENT = "CREATE TABLE "
  96			+ SQLiteAxolotlStore.PREKEY_TABLENAME + "("
  97			+ SQLiteAxolotlStore.ACCOUNT + " TEXT,  "
  98			+ SQLiteAxolotlStore.ID + " INTEGER, "
  99			+ SQLiteAxolotlStore.KEY + " TEXT, FOREIGN KEY("
 100			+ SQLiteAxolotlStore.ACCOUNT
 101			+ ") REFERENCES " + Account.TABLENAME + "(" + Account.UUID + ") ON DELETE CASCADE, "
 102			+ "UNIQUE( " + SQLiteAxolotlStore.ACCOUNT + ", "
 103			+ SQLiteAxolotlStore.ID
 104			+ ") ON CONFLICT REPLACE"
 105			+ ");";
 106
 107	private static String CREATE_SIGNED_PREKEYS_STATEMENT = "CREATE TABLE "
 108			+ SQLiteAxolotlStore.SIGNED_PREKEY_TABLENAME + "("
 109			+ SQLiteAxolotlStore.ACCOUNT + " TEXT,  "
 110			+ SQLiteAxolotlStore.ID + " INTEGER, "
 111			+ SQLiteAxolotlStore.KEY + " TEXT, FOREIGN KEY("
 112			+ SQLiteAxolotlStore.ACCOUNT
 113			+ ") REFERENCES " + Account.TABLENAME + "(" + Account.UUID + ") ON DELETE CASCADE, "
 114			+ "UNIQUE( " + SQLiteAxolotlStore.ACCOUNT + ", "
 115			+ SQLiteAxolotlStore.ID
 116			+ ") ON CONFLICT REPLACE" +
 117			");";
 118
 119	private static String CREATE_SESSIONS_STATEMENT = "CREATE TABLE "
 120			+ SQLiteAxolotlStore.SESSION_TABLENAME + "("
 121			+ SQLiteAxolotlStore.ACCOUNT + " TEXT,  "
 122			+ SQLiteAxolotlStore.NAME + " TEXT, "
 123			+ SQLiteAxolotlStore.DEVICE_ID + " INTEGER, "
 124			+ SQLiteAxolotlStore.KEY + " TEXT, FOREIGN KEY("
 125			+ SQLiteAxolotlStore.ACCOUNT
 126			+ ") REFERENCES " + Account.TABLENAME + "(" + Account.UUID + ") ON DELETE CASCADE, "
 127			+ "UNIQUE( " + SQLiteAxolotlStore.ACCOUNT + ", "
 128			+ SQLiteAxolotlStore.NAME + ", "
 129			+ SQLiteAxolotlStore.DEVICE_ID
 130			+ ") ON CONFLICT REPLACE"
 131			+ ");";
 132
 133	private static String CREATE_IDENTITIES_STATEMENT = "CREATE TABLE "
 134			+ SQLiteAxolotlStore.IDENTITIES_TABLENAME + "("
 135			+ SQLiteAxolotlStore.ACCOUNT + " TEXT,  "
 136			+ SQLiteAxolotlStore.NAME + " TEXT, "
 137			+ SQLiteAxolotlStore.OWN + " INTEGER, "
 138			+ SQLiteAxolotlStore.FINGERPRINT + " TEXT, "
 139			+ SQLiteAxolotlStore.CERTIFICATE + " BLOB, "
 140			+ SQLiteAxolotlStore.TRUST + " TEXT, "
 141			+ SQLiteAxolotlStore.ACTIVE + " NUMBER, "
 142			+ SQLiteAxolotlStore.LAST_ACTIVATION + " NUMBER,"
 143			+ SQLiteAxolotlStore.KEY + " TEXT, FOREIGN KEY("
 144			+ SQLiteAxolotlStore.ACCOUNT
 145			+ ") REFERENCES " + Account.TABLENAME + "(" + Account.UUID + ") ON DELETE CASCADE, "
 146			+ "UNIQUE( " + SQLiteAxolotlStore.ACCOUNT + ", "
 147			+ SQLiteAxolotlStore.NAME + ", "
 148			+ SQLiteAxolotlStore.FINGERPRINT
 149			+ ") ON CONFLICT IGNORE"
 150			+ ");";
 151
 152	private static String RESOLVER_RESULTS_TABLENAME = "resolver_results";
 153
 154	private static String CREATE_RESOLVER_RESULTS_TABLE = "create table "+RESOLVER_RESULTS_TABLENAME+"("
 155			+ Resolver.Result.DOMAIN + " TEXT,"
 156			+ Resolver.Result.HOSTNAME + " TEXT,"
 157			+ Resolver.Result.IP + " BLOB,"
 158			+ Resolver.Result.PRIORITY + " NUMBER,"
 159			+ Resolver.Result.DIRECT_TLS + " NUMBER,"
 160			+ Resolver.Result.AUTHENTICATED + " NUMBER,"
 161			+ Resolver.Result.PORT + " NUMBER,"
 162			+ "UNIQUE("+Resolver.Result.DOMAIN+") ON CONFLICT REPLACE"
 163			+ ");";
 164
 165	private static String CREATE_MESSAGE_TIME_INDEX = "create INDEX message_time_index ON "+Message.TABLENAME+"("+Message.TIME_SENT+")";
 166	private static String CREATE_MESSAGE_CONVERSATION_INDEX = "create INDEX message_conversation_index ON "+Message.TABLENAME+"("+Message.CONVERSATION+")";
 167
 168	private DatabaseBackend(Context context) {
 169		super(context, DATABASE_NAME, null, DATABASE_VERSION);
 170	}
 171
 172	@Override
 173	public void onCreate(SQLiteDatabase db) {
 174		db.execSQL("PRAGMA foreign_keys=ON;");
 175		db.execSQL("create table " + Account.TABLENAME + "(" + Account.UUID+ " TEXT PRIMARY KEY,"
 176				+ Account.USERNAME + " TEXT,"
 177				+ Account.SERVER + " TEXT,"
 178				+ Account.PASSWORD + " TEXT,"
 179				+ Account.DISPLAY_NAME + " TEXT, "
 180				+ Account.STATUS + " TEXT,"
 181				+ Account.STATUS_MESSAGE + " TEXT,"
 182				+ Account.ROSTERVERSION + " TEXT,"
 183				+ Account.OPTIONS + " NUMBER, "
 184				+ Account.AVATAR + " TEXT, "
 185				+ Account.KEYS + " TEXT, "
 186				+ Account.HOSTNAME + " TEXT, "
 187				+ Account.RESOURCE + " TEXT,"
 188				+ Account.PORT + " NUMBER DEFAULT 5222)");
 189		db.execSQL("create table " + Conversation.TABLENAME + " ("
 190				+ Conversation.UUID + " TEXT PRIMARY KEY, " + Conversation.NAME
 191				+ " TEXT, " + Conversation.CONTACT + " TEXT, "
 192				+ Conversation.ACCOUNT + " TEXT, " + Conversation.CONTACTJID
 193				+ " TEXT, " + Conversation.CREATED + " NUMBER, "
 194				+ Conversation.STATUS + " NUMBER, " + Conversation.MODE
 195				+ " NUMBER, " + Conversation.ATTRIBUTES + " TEXT, FOREIGN KEY("
 196				+ Conversation.ACCOUNT + ") REFERENCES " + Account.TABLENAME
 197				+ "(" + Account.UUID + ") ON DELETE CASCADE);");
 198		db.execSQL("create table " + Message.TABLENAME + "( " + Message.UUID
 199				+ " TEXT PRIMARY KEY, " + Message.CONVERSATION + " TEXT, "
 200				+ Message.TIME_SENT + " NUMBER, " + Message.COUNTERPART
 201				+ " TEXT, " + Message.TRUE_COUNTERPART + " TEXT,"
 202				+ Message.BODY + " TEXT, " + Message.ENCRYPTION + " NUMBER, "
 203				+ Message.STATUS + " NUMBER," + Message.TYPE + " NUMBER, "
 204				+ Message.RELATIVE_FILE_PATH + " TEXT, "
 205				+ Message.SERVER_MSG_ID + " TEXT, "
 206				+ Message.FINGERPRINT + " TEXT, "
 207				+ Message.CARBON + " INTEGER, "
 208				+ Message.EDITED + " TEXT, "
 209				+ Message.READ + " NUMBER DEFAULT 1, "
 210				+ Message.OOB + " INTEGER, "
 211				+ Message.ERROR_MESSAGE + " TEXT,"
 212				+ Message.READ_BY_MARKERS + " TEXT,"
 213				+ Message.MARKABLE + " NUMBER DEFAULT 0,"
 214				+ Message.REMOTE_MSG_ID + " TEXT, FOREIGN KEY("
 215				+ Message.CONVERSATION + ") REFERENCES "
 216				+ Conversation.TABLENAME + "(" + Conversation.UUID
 217				+ ") ON DELETE CASCADE);");
 218		db.execSQL(CREATE_MESSAGE_TIME_INDEX);
 219		db.execSQL(CREATE_MESSAGE_CONVERSATION_INDEX);
 220		db.execSQL(CREATE_CONTATCS_STATEMENT);
 221		db.execSQL(CREATE_DISCOVERY_RESULTS_STATEMENT);
 222		db.execSQL(CREATE_SESSIONS_STATEMENT);
 223		db.execSQL(CREATE_PREKEYS_STATEMENT);
 224		db.execSQL(CREATE_SIGNED_PREKEYS_STATEMENT);
 225		db.execSQL(CREATE_IDENTITIES_STATEMENT);
 226		db.execSQL(CREATE_PRESENCE_TEMPLATES_STATEMENT);
 227		db.execSQL(CREATE_RESOLVER_RESULTS_TABLE);
 228	}
 229
 230	@Override
 231	public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
 232		if (oldVersion < 2 && newVersion >= 2) {
 233			db.execSQL("update " + Account.TABLENAME + " set "
 234					+ Account.OPTIONS + " = " + Account.OPTIONS + " | 8");
 235		}
 236		if (oldVersion < 3 && newVersion >= 3) {
 237			db.execSQL("ALTER TABLE " + Message.TABLENAME + " ADD COLUMN "
 238					+ Message.TYPE + " NUMBER");
 239		}
 240		if (oldVersion < 5 && newVersion >= 5) {
 241			db.execSQL("DROP TABLE " + Contact.TABLENAME);
 242			db.execSQL(CREATE_CONTATCS_STATEMENT);
 243			db.execSQL("UPDATE " + Account.TABLENAME + " SET "
 244					+ Account.ROSTERVERSION + " = NULL");
 245		}
 246		if (oldVersion < 6 && newVersion >= 6) {
 247			db.execSQL("ALTER TABLE " + Message.TABLENAME + " ADD COLUMN "
 248					+ Message.TRUE_COUNTERPART + " TEXT");
 249		}
 250		if (oldVersion < 7 && newVersion >= 7) {
 251			db.execSQL("ALTER TABLE " + Message.TABLENAME + " ADD COLUMN "
 252					+ Message.REMOTE_MSG_ID + " TEXT");
 253			db.execSQL("ALTER TABLE " + Contact.TABLENAME + " ADD COLUMN "
 254					+ Contact.AVATAR + " TEXT");
 255			db.execSQL("ALTER TABLE " + Account.TABLENAME + " ADD COLUMN "
 256					+ Account.AVATAR + " TEXT");
 257		}
 258		if (oldVersion < 8 && newVersion >= 8) {
 259			db.execSQL("ALTER TABLE " + Conversation.TABLENAME + " ADD COLUMN "
 260					+ Conversation.ATTRIBUTES + " TEXT");
 261		}
 262		if (oldVersion < 9 && newVersion >= 9) {
 263			db.execSQL("ALTER TABLE " + Contact.TABLENAME + " ADD COLUMN "
 264					+ Contact.LAST_TIME + " NUMBER");
 265			db.execSQL("ALTER TABLE " + Contact.TABLENAME + " ADD COLUMN "
 266					+ Contact.LAST_PRESENCE + " TEXT");
 267		}
 268		if (oldVersion < 10 && newVersion >= 10) {
 269			db.execSQL("ALTER TABLE " + Message.TABLENAME + " ADD COLUMN "
 270					+ Message.RELATIVE_FILE_PATH + " TEXT");
 271		}
 272		if (oldVersion < 11 && newVersion >= 11) {
 273			db.execSQL("ALTER TABLE " + Contact.TABLENAME + " ADD COLUMN "
 274					+ Contact.GROUPS + " TEXT");
 275			db.execSQL("delete from " + Contact.TABLENAME);
 276			db.execSQL("update " + Account.TABLENAME + " set " + Account.ROSTERVERSION + " = NULL");
 277		}
 278		if (oldVersion < 12 && newVersion >= 12) {
 279			db.execSQL("ALTER TABLE " + Message.TABLENAME + " ADD COLUMN "
 280					+ Message.SERVER_MSG_ID + " TEXT");
 281		}
 282		if (oldVersion < 13 && newVersion >= 13) {
 283			db.execSQL("delete from " + Contact.TABLENAME);
 284			db.execSQL("update " + Account.TABLENAME + " set " + Account.ROSTERVERSION + " = NULL");
 285		}
 286		if (oldVersion < 14 && newVersion >= 14) {
 287			canonicalizeJids(db);
 288		}
 289		if (oldVersion < 15 && newVersion >= 15) {
 290			recreateAxolotlDb(db);
 291			db.execSQL("ALTER TABLE " + Message.TABLENAME + " ADD COLUMN "
 292					+ Message.FINGERPRINT + " TEXT");
 293		}
 294		if (oldVersion < 16 && newVersion >= 16) {
 295			db.execSQL("ALTER TABLE " + Message.TABLENAME + " ADD COLUMN "
 296					+ Message.CARBON + " INTEGER");
 297		}
 298		if (oldVersion < 19 && newVersion >= 19) {
 299			db.execSQL("ALTER TABLE " + Account.TABLENAME + " ADD COLUMN " + Account.DISPLAY_NAME + " TEXT");
 300		}
 301		if (oldVersion < 20 && newVersion >= 20) {
 302			db.execSQL("ALTER TABLE " + Account.TABLENAME + " ADD COLUMN " + Account.HOSTNAME + " TEXT");
 303			db.execSQL("ALTER TABLE " + Account.TABLENAME + " ADD COLUMN " + Account.PORT + " NUMBER DEFAULT 5222");
 304		}
 305		if (oldVersion < 26 && newVersion >= 26) {
 306			db.execSQL("ALTER TABLE " + Account.TABLENAME + " ADD COLUMN " + Account.STATUS + " TEXT");
 307			db.execSQL("ALTER TABLE " + Account.TABLENAME + " ADD COLUMN " + Account.STATUS_MESSAGE + " TEXT");
 308		}
 309		if (oldVersion < 40 && newVersion >= 40) {
 310			db.execSQL("ALTER TABLE " + Account.TABLENAME + " ADD COLUMN " + Account.RESOURCE + " TEXT");
 311		}
 312		/* Any migrations that alter the Account table need to happen BEFORE this migration, as it
 313		 * depends on account de-serialization.
 314		 */
 315		if (oldVersion < 17 && newVersion >= 17 && newVersion < 31) {
 316			List<Account> accounts = getAccounts(db);
 317			for (Account account : accounts) {
 318				String ownDeviceIdString = account.getKey(SQLiteAxolotlStore.JSONKEY_REGISTRATION_ID);
 319				if (ownDeviceIdString == null) {
 320					continue;
 321				}
 322				int ownDeviceId = Integer.valueOf(ownDeviceIdString);
 323				SignalProtocolAddress ownAddress = new SignalProtocolAddress(account.getJid().toBareJid().toPreppedString(), ownDeviceId);
 324				deleteSession(db, account, ownAddress);
 325				IdentityKeyPair identityKeyPair = loadOwnIdentityKeyPair(db, account);
 326				if (identityKeyPair != null) {
 327					String[] selectionArgs = {
 328							account.getUuid(),
 329							CryptoHelper.bytesToHex(identityKeyPair.getPublicKey().serialize())
 330					};
 331					ContentValues values = new ContentValues();
 332					values.put(SQLiteAxolotlStore.TRUSTED, 2);
 333					db.update(SQLiteAxolotlStore.IDENTITIES_TABLENAME, values,
 334							SQLiteAxolotlStore.ACCOUNT + " = ? AND "
 335									+ SQLiteAxolotlStore.FINGERPRINT + " = ? ",
 336							selectionArgs);
 337				} else {
 338					Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": could not load own identity key pair");
 339				}
 340			}
 341		}
 342		if (oldVersion < 18 && newVersion >= 18) {
 343			db.execSQL("ALTER TABLE " + Message.TABLENAME + " ADD COLUMN " + Message.READ + " NUMBER DEFAULT 1");
 344		}
 345
 346		if (oldVersion < 21 && newVersion >= 21) {
 347			List<Account> accounts = getAccounts(db);
 348			for (Account account : accounts) {
 349				account.unsetPgpSignature();
 350				db.update(Account.TABLENAME, account.getContentValues(), Account.UUID
 351						+ "=?", new String[]{account.getUuid()});
 352			}
 353		}
 354
 355		if (oldVersion >= 15 && oldVersion < 22 && newVersion >= 22) {
 356			db.execSQL("ALTER TABLE " + SQLiteAxolotlStore.IDENTITIES_TABLENAME + " ADD COLUMN " + SQLiteAxolotlStore.CERTIFICATE);
 357		}
 358
 359		if (oldVersion < 23 && newVersion >= 23) {
 360			db.execSQL(CREATE_DISCOVERY_RESULTS_STATEMENT);
 361		}
 362
 363		if (oldVersion < 24 && newVersion >= 24) {
 364			db.execSQL("ALTER TABLE " + Message.TABLENAME + " ADD COLUMN " + Message.EDITED + " TEXT");
 365		}
 366
 367		if (oldVersion < 25 && newVersion >= 25) {
 368			db.execSQL("ALTER TABLE " + Message.TABLENAME + " ADD COLUMN " + Message.OOB + " INTEGER");
 369		}
 370
 371		if (oldVersion <  26 && newVersion >= 26) {
 372			db.execSQL(CREATE_PRESENCE_TEMPLATES_STATEMENT);
 373		}
 374
 375		if (oldVersion < 27 && newVersion >= 27) {
 376			db.execSQL("DELETE FROM "+ServiceDiscoveryResult.TABLENAME);
 377		}
 378
 379		if (oldVersion < 28 && newVersion >= 28) {
 380			canonicalizeJids(db);
 381		}
 382
 383		if (oldVersion < 29 && newVersion >= 29) {
 384			db.execSQL("ALTER TABLE " + Message.TABLENAME + " ADD COLUMN " + Message.ERROR_MESSAGE + " TEXT");
 385		}
 386		if (oldVersion >= 15 && oldVersion < 31 && newVersion >= 31) {
 387			db.execSQL("ALTER TABLE "+ SQLiteAxolotlStore.IDENTITIES_TABLENAME + " ADD COLUMN "+SQLiteAxolotlStore.TRUST + " TEXT");
 388			db.execSQL("ALTER TABLE "+ SQLiteAxolotlStore.IDENTITIES_TABLENAME + " ADD COLUMN "+SQLiteAxolotlStore.ACTIVE + " NUMBER");
 389			HashMap<Integer,ContentValues> migration = new HashMap<>();
 390			migration.put(0,createFingerprintStatusContentValues(FingerprintStatus.Trust.TRUSTED,true));
 391			migration.put(1,createFingerprintStatusContentValues(FingerprintStatus.Trust.TRUSTED, true));
 392			migration.put(2,createFingerprintStatusContentValues(FingerprintStatus.Trust.UNTRUSTED, true));
 393			migration.put(3,createFingerprintStatusContentValues(FingerprintStatus.Trust.COMPROMISED, false));
 394			migration.put(4,createFingerprintStatusContentValues(FingerprintStatus.Trust.TRUSTED, false));
 395			migration.put(5,createFingerprintStatusContentValues(FingerprintStatus.Trust.TRUSTED, false));
 396			migration.put(6,createFingerprintStatusContentValues(FingerprintStatus.Trust.UNTRUSTED, false));
 397			migration.put(7,createFingerprintStatusContentValues(FingerprintStatus.Trust.VERIFIED_X509, true));
 398			migration.put(8,createFingerprintStatusContentValues(FingerprintStatus.Trust.VERIFIED_X509, false));
 399			for(Map.Entry<Integer,ContentValues> entry : migration.entrySet()) {
 400				String whereClause = SQLiteAxolotlStore.TRUSTED+"=?";
 401				String[] where = {String.valueOf(entry.getKey())};
 402				db.update(SQLiteAxolotlStore.IDENTITIES_TABLENAME,entry.getValue(),whereClause,where);
 403			}
 404
 405		}
 406		if (oldVersion >= 15 && oldVersion < 32 && newVersion >= 32) {
 407			db.execSQL("ALTER TABLE "+ SQLiteAxolotlStore.IDENTITIES_TABLENAME + " ADD COLUMN "+SQLiteAxolotlStore.LAST_ACTIVATION + " NUMBER");
 408			ContentValues defaults = new ContentValues();
 409			defaults.put(SQLiteAxolotlStore.LAST_ACTIVATION,System.currentTimeMillis());
 410			db.update(SQLiteAxolotlStore.IDENTITIES_TABLENAME,defaults,null,null);
 411		}
 412		if (oldVersion >= 15 && oldVersion < 33 && newVersion >= 33) {
 413			String whereClause = SQLiteAxolotlStore.OWN+"=1";
 414			db.update(SQLiteAxolotlStore.IDENTITIES_TABLENAME,createFingerprintStatusContentValues(FingerprintStatus.Trust.VERIFIED,true),whereClause,null);
 415		}
 416
 417		if (oldVersion < 34 && newVersion >= 34) {
 418			db.execSQL(CREATE_MESSAGE_TIME_INDEX);
 419
 420			final File oldPicturesDirectory = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES)+"/Conversations/");
 421			final File oldFilesDirectory = new File(Environment.getExternalStorageDirectory() + "/Conversations/");
 422			final File newFilesDirectory = new File(Environment.getExternalStorageDirectory() + "/Conversations/Media/Conversations Files/");
 423			final File newVideosDirectory = new File(Environment.getExternalStorageDirectory() + "/Conversations/Media/Conversations Videos/");
 424			if (oldPicturesDirectory.exists() && oldPicturesDirectory.isDirectory()) {
 425				final File newPicturesDirectory = new File(Environment.getExternalStorageDirectory() + "/Conversations/Media/Conversations Images/");
 426				newPicturesDirectory.getParentFile().mkdirs();
 427				if (oldPicturesDirectory.renameTo(newPicturesDirectory)) {
 428					Log.d(Config.LOGTAG,"moved "+oldPicturesDirectory.getAbsolutePath()+" to "+newPicturesDirectory.getAbsolutePath());
 429				}
 430			}
 431			if (oldFilesDirectory.exists() && oldFilesDirectory.isDirectory()) {
 432				newFilesDirectory.mkdirs();
 433				newVideosDirectory.mkdirs();
 434				final File[] files = oldFilesDirectory.listFiles();
 435				if (files == null) {
 436					return;
 437				}
 438				for(File file : files) {
 439					if (file.getName().equals(".nomedia")) {
 440						if (file.delete()) {
 441							Log.d(Config.LOGTAG,"deleted nomedia file in "+oldFilesDirectory.getAbsolutePath());
 442						}
 443					} else if (file.isFile()) {
 444						final String name = file.getName();
 445						boolean isVideo = false;
 446						int start = name.lastIndexOf('.') + 1;
 447						if (start < name.length()) {
 448							String mime=  MimeUtils.guessMimeTypeFromExtension(name.substring(start));
 449							isVideo = mime != null && mime.startsWith("video/");
 450						}
 451						File dst = new File((isVideo ? newVideosDirectory : newFilesDirectory).getAbsolutePath()+"/"+file.getName());
 452						if (file.renameTo(dst)) {
 453							Log.d(Config.LOGTAG, "moved " + file + " to " + dst);
 454						}
 455					}
 456				}
 457			}
 458		}
 459		if (oldVersion < 35 && newVersion >= 35) {
 460			db.execSQL(CREATE_MESSAGE_CONVERSATION_INDEX);
 461		}
 462		if (oldVersion < 36 && newVersion >= 36) {
 463			List<Account> accounts = getAccounts(db);
 464			for (Account account : accounts) {
 465				account.setOption(Account.OPTION_REQUIRES_ACCESS_MODE_CHANGE,true);
 466				account.setOption(Account.OPTION_LOGGED_IN_SUCCESSFULLY,false);
 467				db.update(Account.TABLENAME, account.getContentValues(), Account.UUID
 468						+ "=?", new String[]{account.getUuid()});
 469			}
 470		}
 471
 472		if (oldVersion < 37 && newVersion >= 37) {
 473			db.execSQL("ALTER TABLE " + Message.TABLENAME + " ADD COLUMN " + Message.READ_BY_MARKERS + " TEXT");
 474		}
 475
 476		if (oldVersion < 38 && newVersion >= 38) {
 477			db.execSQL("ALTER TABLE " + Message.TABLENAME + " ADD COLUMN " + Message.MARKABLE + " NUMBER DEFAULT 0");
 478		}
 479
 480		if (oldVersion < 39 && newVersion >= 39) {
 481			db.execSQL(CREATE_RESOLVER_RESULTS_TABLE);
 482		}
 483	}
 484
 485	private static ContentValues createFingerprintStatusContentValues(FingerprintStatus.Trust trust, boolean active) {
 486		ContentValues values = new ContentValues();
 487		values.put(SQLiteAxolotlStore.TRUST,trust.toString());
 488		values.put(SQLiteAxolotlStore.ACTIVE,active ? 1 : 0);
 489		return values;
 490	}
 491
 492	private void canonicalizeJids(SQLiteDatabase db) {
 493		// migrate db to new, canonicalized JID domainpart representation
 494
 495		// Conversation table
 496		Cursor cursor = db.rawQuery("select * from " + Conversation.TABLENAME, new String[0]);
 497		while (cursor.moveToNext()) {
 498			String newJid;
 499			try {
 500				newJid = Jid.fromString(
 501						cursor.getString(cursor.getColumnIndex(Conversation.CONTACTJID))
 502				).toPreppedString();
 503			} catch (InvalidJidException ignored) {
 504				Log.e(Config.LOGTAG, "Failed to migrate Conversation CONTACTJID "
 505						+ cursor.getString(cursor.getColumnIndex(Conversation.CONTACTJID))
 506						+ ": " + ignored + ". Skipping...");
 507				continue;
 508			}
 509
 510			String updateArgs[] = {
 511					newJid,
 512					cursor.getString(cursor.getColumnIndex(Conversation.UUID)),
 513			};
 514			db.execSQL("update " + Conversation.TABLENAME
 515					+ " set " + Conversation.CONTACTJID + " = ? "
 516					+ " where " + Conversation.UUID + " = ?", updateArgs);
 517		}
 518		cursor.close();
 519
 520		// Contact table
 521		cursor = db.rawQuery("select * from " + Contact.TABLENAME, new String[0]);
 522		while (cursor.moveToNext()) {
 523			String newJid;
 524			try {
 525				newJid = Jid.fromString(
 526						cursor.getString(cursor.getColumnIndex(Contact.JID))
 527				).toPreppedString();
 528			} catch (InvalidJidException ignored) {
 529				Log.e(Config.LOGTAG, "Failed to migrate Contact JID "
 530						+ cursor.getString(cursor.getColumnIndex(Contact.JID))
 531						+ ": " + ignored + ". Skipping...");
 532				continue;
 533			}
 534
 535			String updateArgs[] = {
 536					newJid,
 537					cursor.getString(cursor.getColumnIndex(Contact.ACCOUNT)),
 538					cursor.getString(cursor.getColumnIndex(Contact.JID)),
 539			};
 540			db.execSQL("update " + Contact.TABLENAME
 541					+ " set " + Contact.JID + " = ? "
 542					+ " where " + Contact.ACCOUNT + " = ? "
 543					+ " AND " + Contact.JID + " = ?", updateArgs);
 544		}
 545		cursor.close();
 546
 547		// Account table
 548		cursor = db.rawQuery("select * from " + Account.TABLENAME, new String[0]);
 549		while (cursor.moveToNext()) {
 550			String newServer;
 551			try {
 552				newServer = Jid.fromParts(
 553						cursor.getString(cursor.getColumnIndex(Account.USERNAME)),
 554						cursor.getString(cursor.getColumnIndex(Account.SERVER)),
 555						"mobile"
 556				).getDomainpart();
 557			} catch (InvalidJidException ignored) {
 558				Log.e(Config.LOGTAG, "Failed to migrate Account SERVER "
 559						+ cursor.getString(cursor.getColumnIndex(Account.SERVER))
 560						+ ": " + ignored + ". Skipping...");
 561				continue;
 562			}
 563
 564			String updateArgs[] = {
 565					newServer,
 566					cursor.getString(cursor.getColumnIndex(Account.UUID)),
 567			};
 568			db.execSQL("update " + Account.TABLENAME
 569					+ " set " + Account.SERVER + " = ? "
 570					+ " where " + Account.UUID + " = ?", updateArgs);
 571		}
 572		cursor.close();
 573	}
 574
 575	public static synchronized DatabaseBackend getInstance(Context context) {
 576		if (instance == null) {
 577			instance = new DatabaseBackend(context);
 578		}
 579		return instance;
 580	}
 581
 582	public void createConversation(Conversation conversation) {
 583		SQLiteDatabase db = this.getWritableDatabase();
 584		db.insert(Conversation.TABLENAME, null, conversation.getContentValues());
 585	}
 586
 587	public void createMessage(Message message) {
 588		SQLiteDatabase db = this.getWritableDatabase();
 589		db.insert(Message.TABLENAME, null, message.getContentValues());
 590	}
 591
 592	public void createAccount(Account account) {
 593		SQLiteDatabase db = this.getWritableDatabase();
 594		db.insert(Account.TABLENAME, null, account.getContentValues());
 595	}
 596
 597	public void insertDiscoveryResult(ServiceDiscoveryResult result) {
 598		SQLiteDatabase db = this.getWritableDatabase();
 599		db.insert(ServiceDiscoveryResult.TABLENAME, null, result.getContentValues());
 600	}
 601
 602	public ServiceDiscoveryResult findDiscoveryResult(final String hash, final String ver) {
 603		SQLiteDatabase db = this.getReadableDatabase();
 604		String[] selectionArgs = {hash, ver};
 605		Cursor cursor = db.query(ServiceDiscoveryResult.TABLENAME, null,
 606				ServiceDiscoveryResult.HASH + "=? AND " + ServiceDiscoveryResult.VER + "=?",
 607				selectionArgs, null, null, null);
 608		if (cursor.getCount() == 0) {
 609			cursor.close();
 610			return null;
 611		}
 612		cursor.moveToFirst();
 613
 614		ServiceDiscoveryResult result = null;
 615		try {
 616			result = new ServiceDiscoveryResult(cursor);
 617		} catch (JSONException e) { /* result is still null */ }
 618
 619		cursor.close();
 620		return result;
 621	}
 622
 623	public void saveResolverResult(String domain, Resolver.Result result) {
 624		SQLiteDatabase db = this.getWritableDatabase();
 625		ContentValues contentValues = result.toContentValues();
 626		contentValues.put(Resolver.Result.DOMAIN,domain);
 627		db.insert(RESOLVER_RESULTS_TABLENAME, null, contentValues);
 628	}
 629
 630	public Resolver.Result findResolverResult(String domain) {
 631		SQLiteDatabase db = this.getReadableDatabase();
 632		String where = Resolver.Result.DOMAIN+"=?";
 633		String[] whereArgs = {domain};
 634		Cursor cursor = db.query(RESOLVER_RESULTS_TABLENAME,null,where,whereArgs,null,null,null);
 635		Resolver.Result result = null;
 636		if (cursor != null) {
 637			if (cursor.moveToFirst()) {
 638				result = Resolver.Result.fromCursor(cursor);
 639			}
 640			cursor.close();
 641		}
 642		return result;
 643	}
 644
 645	public void insertPresenceTemplate(PresenceTemplate template) {
 646		SQLiteDatabase db = this.getWritableDatabase();
 647		db.insert(PresenceTemplate.TABELNAME, null, template.getContentValues());
 648	}
 649
 650	public List<PresenceTemplate> getPresenceTemplates() {
 651		ArrayList<PresenceTemplate> templates = new ArrayList<>();
 652		SQLiteDatabase db = this.getReadableDatabase();
 653		Cursor cursor = db.query(PresenceTemplate.TABELNAME,null,null,null,null,null,PresenceTemplate.LAST_USED+" desc");
 654		while (cursor.moveToNext()) {
 655			templates.add(PresenceTemplate.fromCursor(cursor));
 656		}
 657		cursor.close();
 658		return templates;
 659	}
 660
 661	public void deletePresenceTemplate(PresenceTemplate template) {
 662		Log.d(Config.LOGTAG,"deleting presence template with uuid "+template.getUuid());
 663		SQLiteDatabase db = this.getWritableDatabase();
 664		String where = PresenceTemplate.UUID+"=?";
 665		String[] whereArgs = {template.getUuid()};
 666		db.delete(PresenceTemplate.TABELNAME,where,whereArgs);
 667	}
 668
 669	public CopyOnWriteArrayList<Conversation> getConversations(int status) {
 670		CopyOnWriteArrayList<Conversation> list = new CopyOnWriteArrayList<>();
 671		SQLiteDatabase db = this.getReadableDatabase();
 672		String[] selectionArgs = {Integer.toString(status)};
 673		Cursor cursor = db.rawQuery("select * from " + Conversation.TABLENAME
 674				+ " where " + Conversation.STATUS + " = ? order by "
 675				+ Conversation.CREATED + " desc", selectionArgs);
 676		while (cursor.moveToNext()) {
 677			list.add(Conversation.fromCursor(cursor));
 678		}
 679		cursor.close();
 680		return list;
 681	}
 682
 683	public ArrayList<Message> getMessages(Conversation conversations, int limit) {
 684		return getMessages(conversations, limit, -1);
 685	}
 686
 687	public ArrayList<Message> getMessages(Conversation conversation, int limit,
 688										  long timestamp) {
 689		ArrayList<Message> list = new ArrayList<>();
 690		SQLiteDatabase db = this.getReadableDatabase();
 691		Cursor cursor;
 692		if (timestamp == -1) {
 693			String[] selectionArgs = {conversation.getUuid()};
 694			cursor = db.query(Message.TABLENAME, null, Message.CONVERSATION
 695					+ "=?", selectionArgs, null, null, Message.TIME_SENT
 696					+ " DESC", String.valueOf(limit));
 697		} else {
 698			String[] selectionArgs = {conversation.getUuid(),
 699					Long.toString(timestamp)};
 700			cursor = db.query(Message.TABLENAME, null, Message.CONVERSATION
 701							+ "=? and " + Message.TIME_SENT + "<?", selectionArgs,
 702					null, null, Message.TIME_SENT + " DESC",
 703					String.valueOf(limit));
 704		}
 705		if (cursor.getCount() > 0) {
 706			cursor.moveToLast();
 707			do {
 708				Message message = Message.fromCursor(cursor,conversation);
 709				if (message != null) {
 710					list.add(message);
 711				}
 712			} while (cursor.moveToPrevious());
 713		}
 714		cursor.close();
 715		return list;
 716	}
 717
 718	public Iterable<Message> getMessagesIterable(final Conversation conversation) {
 719		return new Iterable<Message>() {
 720			@Override
 721			public Iterator<Message> iterator() {
 722				class MessageIterator implements Iterator<Message> {
 723					SQLiteDatabase db = getReadableDatabase();
 724					String[] selectionArgs = {conversation.getUuid()};
 725					Cursor cursor = db.query(Message.TABLENAME, null, Message.CONVERSATION
 726							+ "=?", selectionArgs, null, null, Message.TIME_SENT
 727							+ " ASC", null);
 728
 729					public MessageIterator() {
 730						cursor.moveToFirst();
 731					}
 732
 733					@Override
 734					public boolean hasNext() {
 735						return !cursor.isAfterLast();
 736					}
 737
 738					@Override
 739					public Message next() {
 740						Message message = Message.fromCursor(cursor, conversation);
 741						cursor.moveToNext();
 742						return message;
 743					}
 744
 745					@Override
 746					public void remove() {
 747						throw new UnsupportedOperationException();
 748					}
 749				}
 750				return new MessageIterator();
 751			}
 752		};
 753	}
 754
 755	public Conversation findConversation(final Account account, final Jid contactJid) {
 756		SQLiteDatabase db = this.getReadableDatabase();
 757		String[] selectionArgs = {account.getUuid(),
 758				contactJid.toBareJid().toPreppedString() + "/%",
 759				contactJid.toBareJid().toPreppedString()
 760		};
 761		Cursor cursor = db.query(Conversation.TABLENAME, null,
 762				Conversation.ACCOUNT + "=? AND (" + Conversation.CONTACTJID
 763						+ " like ? OR " + Conversation.CONTACTJID + "=?)", selectionArgs, null, null, null);
 764		if (cursor.getCount() == 0) {
 765			cursor.close();
 766			return null;
 767		}
 768		cursor.moveToFirst();
 769		Conversation conversation = Conversation.fromCursor(cursor);
 770		cursor.close();
 771		return conversation;
 772	}
 773
 774	public void updateConversation(final Conversation conversation) {
 775		final SQLiteDatabase db = this.getWritableDatabase();
 776		final String[] args = {conversation.getUuid()};
 777		db.update(Conversation.TABLENAME, conversation.getContentValues(),
 778				Conversation.UUID + "=?", args);
 779	}
 780
 781	public List<Account> getAccounts() {
 782		SQLiteDatabase db = this.getReadableDatabase();
 783		return getAccounts(db);
 784	}
 785
 786	public List<Jid> getAccountJids() {
 787		SQLiteDatabase db = this.getReadableDatabase();
 788		final List<Jid> jids = new ArrayList<>();
 789		final String[] columns = new String[]{Account.USERNAME, Account.SERVER};
 790		Cursor cursor = db.query(Account.TABLENAME,columns,null,null,null,null,null);
 791		try {
 792			while(cursor.moveToNext()) {
 793				jids.add(Jid.fromParts(cursor.getString(0),cursor.getString(1),null));
 794			}
 795			return jids;
 796		} catch (Exception e) {
 797			return jids;
 798		} finally {
 799			if (cursor != null) {
 800				cursor.close();
 801			}
 802		}
 803	}
 804
 805	private List<Account> getAccounts(SQLiteDatabase db) {
 806		List<Account> list = new ArrayList<>();
 807		Cursor cursor = db.query(Account.TABLENAME, null, null, null, null,
 808				null, null);
 809		while (cursor.moveToNext()) {
 810			list.add(Account.fromCursor(cursor));
 811		}
 812		cursor.close();
 813		return list;
 814	}
 815
 816	public boolean updateAccount(Account account) {
 817		SQLiteDatabase db = this.getWritableDatabase();
 818		String[] args = {account.getUuid()};
 819		final int rows = db.update(Account.TABLENAME, account.getContentValues(), Account.UUID + "=?", args);
 820		return rows == 1;
 821	}
 822
 823	public boolean deleteAccount(Account account) {
 824		SQLiteDatabase db = this.getWritableDatabase();
 825		String[] args = {account.getUuid()};
 826		final int rows = db.delete(Account.TABLENAME, Account.UUID + "=?", args);
 827		return rows == 1;
 828	}
 829
 830	@Override
 831	public SQLiteDatabase getWritableDatabase() {
 832		SQLiteDatabase db = super.getWritableDatabase();
 833		db.execSQL("PRAGMA foreign_keys=ON;");
 834		return db;
 835	}
 836
 837	public void updateMessage(Message message) {
 838		SQLiteDatabase db = this.getWritableDatabase();
 839		String[] args = {message.getUuid()};
 840		db.update(Message.TABLENAME, message.getContentValues(), Message.UUID
 841				+ "=?", args);
 842	}
 843
 844	public void updateMessage(Message message, String uuid) {
 845		SQLiteDatabase db = this.getWritableDatabase();
 846		String[] args = {uuid};
 847		db.update(Message.TABLENAME, message.getContentValues(), Message.UUID
 848				+ "=?", args);
 849	}
 850
 851	public void readRoster(Roster roster) {
 852		SQLiteDatabase db = this.getReadableDatabase();
 853		Cursor cursor;
 854		String args[] = {roster.getAccount().getUuid()};
 855		cursor = db.query(Contact.TABLENAME, null, Contact.ACCOUNT + "=?", args, null, null, null);
 856		while (cursor.moveToNext()) {
 857			roster.initContact(Contact.fromCursor(cursor));
 858		}
 859		cursor.close();
 860	}
 861
 862	public void writeRoster(final Roster roster) {
 863		final Account account = roster.getAccount();
 864		final SQLiteDatabase db = this.getWritableDatabase();
 865		db.beginTransaction();
 866		for (Contact contact : roster.getContacts()) {
 867			if (contact.getOption(Contact.Options.IN_ROSTER)) {
 868				db.insert(Contact.TABLENAME, null, contact.getContentValues());
 869			} else {
 870				String where = Contact.ACCOUNT + "=? AND " + Contact.JID + "=?";
 871				String[] whereArgs = {account.getUuid(), contact.getJid().toPreppedString()};
 872				db.delete(Contact.TABLENAME, where, whereArgs);
 873			}
 874		}
 875		db.setTransactionSuccessful();
 876		db.endTransaction();
 877		account.setRosterVersion(roster.getVersion());
 878		updateAccount(account);
 879	}
 880
 881	public void deleteMessagesInConversation(Conversation conversation) {
 882		SQLiteDatabase db = this.getWritableDatabase();
 883		String[] args = {conversation.getUuid()};
 884		db.delete(Message.TABLENAME, Message.CONVERSATION + "=?", args);
 885	}
 886
 887	public boolean expireOldMessages(long timestamp) {
 888		String where = Message.TIME_SENT+"<?";
 889		String[] whereArgs = {String.valueOf(timestamp)};
 890		SQLiteDatabase db = this.getReadableDatabase();
 891		return db.delete(Message.TABLENAME,where,whereArgs) > 0;
 892	}
 893
 894	public MamReference getLastMessageReceived(Account account) {
 895		Cursor cursor = null;
 896		try {
 897			SQLiteDatabase db = this.getReadableDatabase();
 898			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";
 899			String[] args = {account.getUuid()};
 900			cursor = db.rawQuery(sql, args);
 901			if (cursor.getCount() == 0) {
 902				return null;
 903			} else {
 904				cursor.moveToFirst();
 905				return new MamReference(cursor.getLong(0), cursor.getString(1));
 906			}
 907		} catch (Exception e) {
 908			return null;
 909		} finally {
 910			if (cursor != null) {
 911				cursor.close();
 912			}
 913		}
 914	}
 915
 916	public long getLastTimeFingerprintUsed(Account account, String fingerprint) {
 917		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";
 918		String[] args = {account.getUuid(), fingerprint};
 919		Cursor cursor = getReadableDatabase().rawQuery(SQL,args);
 920		long time;
 921		if (cursor.moveToFirst()) {
 922			time = cursor.getLong(0);
 923		} else {
 924			time = 0;
 925		}
 926		cursor.close();
 927		return time;
 928	}
 929
 930	public MamReference getLastClearDate(Account account) {
 931		SQLiteDatabase db = this.getReadableDatabase();
 932		String[] columns = {Conversation.ATTRIBUTES};
 933		String selection = Conversation.ACCOUNT + "=?";
 934		String[] args = {account.getUuid()};
 935		Cursor cursor = db.query(Conversation.TABLENAME,columns,selection,args,null,null,null);
 936		MamReference maxClearDate = new MamReference(0);
 937		while (cursor.moveToNext()) {
 938			try {
 939				final JSONObject o = new JSONObject(cursor.getString(0));
 940				maxClearDate = MamReference.max(maxClearDate, MamReference.fromAttribute(o.getString(Conversation.ATTRIBUTE_LAST_CLEAR_HISTORY)));
 941			} catch (Exception e) {
 942				//ignored
 943			}
 944		}
 945		cursor.close();
 946		return maxClearDate;
 947	}
 948
 949	private Cursor getCursorForSession(Account account, SignalProtocolAddress contact) {
 950		final SQLiteDatabase db = this.getReadableDatabase();
 951		String[] selectionArgs = {account.getUuid(),
 952				contact.getName(),
 953				Integer.toString(contact.getDeviceId())};
 954		return db.query(SQLiteAxolotlStore.SESSION_TABLENAME,
 955				null,
 956				SQLiteAxolotlStore.ACCOUNT + " = ? AND "
 957						+ SQLiteAxolotlStore.NAME + " = ? AND "
 958						+ SQLiteAxolotlStore.DEVICE_ID + " = ? ",
 959				selectionArgs,
 960				null, null, null);
 961	}
 962
 963	public SessionRecord loadSession(Account account, SignalProtocolAddress contact) {
 964		SessionRecord session = null;
 965		Cursor cursor = getCursorForSession(account, contact);
 966		if (cursor.getCount() != 0) {
 967			cursor.moveToFirst();
 968			try {
 969				session = new SessionRecord(Base64.decode(cursor.getString(cursor.getColumnIndex(SQLiteAxolotlStore.KEY)), Base64.DEFAULT));
 970			} catch (IOException e) {
 971				cursor.close();
 972				throw new AssertionError(e);
 973			}
 974		}
 975		cursor.close();
 976		return session;
 977	}
 978
 979	public List<Integer> getSubDeviceSessions(Account account, SignalProtocolAddress contact) {
 980		final SQLiteDatabase db = this.getReadableDatabase();
 981		return getSubDeviceSessions(db, account, contact);
 982	}
 983
 984	private List<Integer> getSubDeviceSessions(SQLiteDatabase db, Account account, SignalProtocolAddress contact) {
 985		List<Integer> devices = new ArrayList<>();
 986		String[] columns = {SQLiteAxolotlStore.DEVICE_ID};
 987		String[] selectionArgs = {account.getUuid(),
 988				contact.getName()};
 989		Cursor cursor = db.query(SQLiteAxolotlStore.SESSION_TABLENAME,
 990				columns,
 991				SQLiteAxolotlStore.ACCOUNT + " = ? AND "
 992						+ SQLiteAxolotlStore.NAME + " = ?",
 993				selectionArgs,
 994				null, null, null);
 995
 996		while (cursor.moveToNext()) {
 997			devices.add(cursor.getInt(
 998					cursor.getColumnIndex(SQLiteAxolotlStore.DEVICE_ID)));
 999		}
1000
1001		cursor.close();
1002		return devices;
1003	}
1004
1005	public List<String> getKnownSignalAddresses(Account account) {
1006		List<String> addresses = new ArrayList<>();
1007		String[] colums = {"DISTINCT "+SQLiteAxolotlStore.NAME};
1008		String[] selectionArgs = {account.getUuid()};
1009		Cursor cursor = getReadableDatabase().query(SQLiteAxolotlStore.SESSION_TABLENAME,
1010				colums,
1011				SQLiteAxolotlStore.ACCOUNT + " = ?",
1012				selectionArgs,
1013				null,null,null
1014				);
1015		while (cursor.moveToNext()) {
1016			addresses.add(cursor.getString(0));
1017		}
1018		cursor.close();
1019		return addresses;
1020	}
1021
1022	public boolean containsSession(Account account, SignalProtocolAddress contact) {
1023		Cursor cursor = getCursorForSession(account, contact);
1024		int count = cursor.getCount();
1025		cursor.close();
1026		return count != 0;
1027	}
1028
1029	public void storeSession(Account account, SignalProtocolAddress contact, SessionRecord session) {
1030		SQLiteDatabase db = this.getWritableDatabase();
1031		ContentValues values = new ContentValues();
1032		values.put(SQLiteAxolotlStore.NAME, contact.getName());
1033		values.put(SQLiteAxolotlStore.DEVICE_ID, contact.getDeviceId());
1034		values.put(SQLiteAxolotlStore.KEY, Base64.encodeToString(session.serialize(), Base64.DEFAULT));
1035		values.put(SQLiteAxolotlStore.ACCOUNT, account.getUuid());
1036		db.insert(SQLiteAxolotlStore.SESSION_TABLENAME, null, values);
1037	}
1038
1039	public void deleteSession(Account account, SignalProtocolAddress contact) {
1040		SQLiteDatabase db = this.getWritableDatabase();
1041		deleteSession(db, account, contact);
1042	}
1043
1044	private void deleteSession(SQLiteDatabase db, Account account, SignalProtocolAddress contact) {
1045		String[] args = {account.getUuid(),
1046				contact.getName(),
1047				Integer.toString(contact.getDeviceId())};
1048		db.delete(SQLiteAxolotlStore.SESSION_TABLENAME,
1049				SQLiteAxolotlStore.ACCOUNT + " = ? AND "
1050						+ SQLiteAxolotlStore.NAME + " = ? AND "
1051						+ SQLiteAxolotlStore.DEVICE_ID + " = ? ",
1052				args);
1053	}
1054
1055	public void deleteAllSessions(Account account, SignalProtocolAddress contact) {
1056		SQLiteDatabase db = this.getWritableDatabase();
1057		String[] args = {account.getUuid(), contact.getName()};
1058		db.delete(SQLiteAxolotlStore.SESSION_TABLENAME,
1059				SQLiteAxolotlStore.ACCOUNT + "=? AND "
1060						+ SQLiteAxolotlStore.NAME + " = ?",
1061				args);
1062	}
1063
1064	private Cursor getCursorForPreKey(Account account, int preKeyId) {
1065		SQLiteDatabase db = this.getReadableDatabase();
1066		String[] columns = {SQLiteAxolotlStore.KEY};
1067		String[] selectionArgs = {account.getUuid(), Integer.toString(preKeyId)};
1068		Cursor cursor = db.query(SQLiteAxolotlStore.PREKEY_TABLENAME,
1069				columns,
1070				SQLiteAxolotlStore.ACCOUNT + "=? AND "
1071						+ SQLiteAxolotlStore.ID + "=?",
1072				selectionArgs,
1073				null, null, null);
1074
1075		return cursor;
1076	}
1077
1078	public PreKeyRecord loadPreKey(Account account, int preKeyId) {
1079		PreKeyRecord record = null;
1080		Cursor cursor = getCursorForPreKey(account, preKeyId);
1081		if (cursor.getCount() != 0) {
1082			cursor.moveToFirst();
1083			try {
1084				record = new PreKeyRecord(Base64.decode(cursor.getString(cursor.getColumnIndex(SQLiteAxolotlStore.KEY)), Base64.DEFAULT));
1085			} catch (IOException e) {
1086				throw new AssertionError(e);
1087			}
1088		}
1089		cursor.close();
1090		return record;
1091	}
1092
1093	public boolean containsPreKey(Account account, int preKeyId) {
1094		Cursor cursor = getCursorForPreKey(account, preKeyId);
1095		int count = cursor.getCount();
1096		cursor.close();
1097		return count != 0;
1098	}
1099
1100	public void storePreKey(Account account, PreKeyRecord record) {
1101		SQLiteDatabase db = this.getWritableDatabase();
1102		ContentValues values = new ContentValues();
1103		values.put(SQLiteAxolotlStore.ID, record.getId());
1104		values.put(SQLiteAxolotlStore.KEY, Base64.encodeToString(record.serialize(), Base64.DEFAULT));
1105		values.put(SQLiteAxolotlStore.ACCOUNT, account.getUuid());
1106		db.insert(SQLiteAxolotlStore.PREKEY_TABLENAME, null, values);
1107	}
1108
1109	public void deletePreKey(Account account, int preKeyId) {
1110		SQLiteDatabase db = this.getWritableDatabase();
1111		String[] args = {account.getUuid(), Integer.toString(preKeyId)};
1112		db.delete(SQLiteAxolotlStore.PREKEY_TABLENAME,
1113				SQLiteAxolotlStore.ACCOUNT + "=? AND "
1114						+ SQLiteAxolotlStore.ID + "=?",
1115				args);
1116	}
1117
1118	private Cursor getCursorForSignedPreKey(Account account, int signedPreKeyId) {
1119		SQLiteDatabase db = this.getReadableDatabase();
1120		String[] columns = {SQLiteAxolotlStore.KEY};
1121		String[] selectionArgs = {account.getUuid(), Integer.toString(signedPreKeyId)};
1122		Cursor cursor = db.query(SQLiteAxolotlStore.SIGNED_PREKEY_TABLENAME,
1123				columns,
1124				SQLiteAxolotlStore.ACCOUNT + "=? AND " + SQLiteAxolotlStore.ID + "=?",
1125				selectionArgs,
1126				null, null, null);
1127
1128		return cursor;
1129	}
1130
1131	public SignedPreKeyRecord loadSignedPreKey(Account account, int signedPreKeyId) {
1132		SignedPreKeyRecord record = null;
1133		Cursor cursor = getCursorForSignedPreKey(account, signedPreKeyId);
1134		if (cursor.getCount() != 0) {
1135			cursor.moveToFirst();
1136			try {
1137				record = new SignedPreKeyRecord(Base64.decode(cursor.getString(cursor.getColumnIndex(SQLiteAxolotlStore.KEY)), Base64.DEFAULT));
1138			} catch (IOException e) {
1139				throw new AssertionError(e);
1140			}
1141		}
1142		cursor.close();
1143		return record;
1144	}
1145
1146	public List<SignedPreKeyRecord> loadSignedPreKeys(Account account) {
1147		List<SignedPreKeyRecord> prekeys = new ArrayList<>();
1148		SQLiteDatabase db = this.getReadableDatabase();
1149		String[] columns = {SQLiteAxolotlStore.KEY};
1150		String[] selectionArgs = {account.getUuid()};
1151		Cursor cursor = db.query(SQLiteAxolotlStore.SIGNED_PREKEY_TABLENAME,
1152				columns,
1153				SQLiteAxolotlStore.ACCOUNT + "=?",
1154				selectionArgs,
1155				null, null, null);
1156
1157		while (cursor.moveToNext()) {
1158			try {
1159				prekeys.add(new SignedPreKeyRecord(Base64.decode(cursor.getString(cursor.getColumnIndex(SQLiteAxolotlStore.KEY)), Base64.DEFAULT)));
1160			} catch (IOException ignored) {
1161			}
1162		}
1163		cursor.close();
1164		return prekeys;
1165	}
1166
1167	public int getSignedPreKeysCount(Account account) {
1168		String[] columns = {"count("+SQLiteAxolotlStore.KEY+")"};
1169		String[] selectionArgs = {account.getUuid()};
1170		SQLiteDatabase db = this.getReadableDatabase();
1171		Cursor cursor = db.query(SQLiteAxolotlStore.SIGNED_PREKEY_TABLENAME,
1172				columns,
1173				SQLiteAxolotlStore.ACCOUNT + "=?",
1174				selectionArgs,
1175				null, null, null);
1176		final int count;
1177		if (cursor.moveToFirst()) {
1178			count = cursor.getInt(0);
1179		} else {
1180			count = 0;
1181		}
1182		cursor.close();
1183		return count;
1184	}
1185
1186	public boolean containsSignedPreKey(Account account, int signedPreKeyId) {
1187		Cursor cursor = getCursorForPreKey(account, signedPreKeyId);
1188		int count = cursor.getCount();
1189		cursor.close();
1190		return count != 0;
1191	}
1192
1193	public void storeSignedPreKey(Account account, SignedPreKeyRecord record) {
1194		SQLiteDatabase db = this.getWritableDatabase();
1195		ContentValues values = new ContentValues();
1196		values.put(SQLiteAxolotlStore.ID, record.getId());
1197		values.put(SQLiteAxolotlStore.KEY, Base64.encodeToString(record.serialize(), Base64.DEFAULT));
1198		values.put(SQLiteAxolotlStore.ACCOUNT, account.getUuid());
1199		db.insert(SQLiteAxolotlStore.SIGNED_PREKEY_TABLENAME, null, values);
1200	}
1201
1202	public void deleteSignedPreKey(Account account, int signedPreKeyId) {
1203		SQLiteDatabase db = this.getWritableDatabase();
1204		String[] args = {account.getUuid(), Integer.toString(signedPreKeyId)};
1205		db.delete(SQLiteAxolotlStore.SIGNED_PREKEY_TABLENAME,
1206				SQLiteAxolotlStore.ACCOUNT + "=? AND "
1207						+ SQLiteAxolotlStore.ID + "=?",
1208				args);
1209	}
1210
1211	private Cursor getIdentityKeyCursor(Account account, String name, boolean own) {
1212		final SQLiteDatabase db = this.getReadableDatabase();
1213		return getIdentityKeyCursor(db, account, name, own);
1214	}
1215
1216	private Cursor getIdentityKeyCursor(SQLiteDatabase db, Account account, String name, boolean own) {
1217		return getIdentityKeyCursor(db, account, name, own, null);
1218	}
1219
1220	private Cursor getIdentityKeyCursor(Account account, String fingerprint) {
1221		final SQLiteDatabase db = this.getReadableDatabase();
1222		return getIdentityKeyCursor(db, account, fingerprint);
1223	}
1224
1225	private Cursor getIdentityKeyCursor(SQLiteDatabase db, Account account, String fingerprint) {
1226		return getIdentityKeyCursor(db, account, null, null, fingerprint);
1227	}
1228
1229	private Cursor getIdentityKeyCursor(SQLiteDatabase db, Account account, String name, Boolean own, String fingerprint) {
1230		String[] columns = {SQLiteAxolotlStore.TRUST,
1231				SQLiteAxolotlStore.ACTIVE,
1232				SQLiteAxolotlStore.LAST_ACTIVATION,
1233				SQLiteAxolotlStore.KEY};
1234		ArrayList<String> selectionArgs = new ArrayList<>(4);
1235		selectionArgs.add(account.getUuid());
1236		String selectionString = SQLiteAxolotlStore.ACCOUNT + " = ?";
1237		if (name != null) {
1238			selectionArgs.add(name);
1239			selectionString += " AND " + SQLiteAxolotlStore.NAME + " = ?";
1240		}
1241		if (fingerprint != null) {
1242			selectionArgs.add(fingerprint);
1243			selectionString += " AND " + SQLiteAxolotlStore.FINGERPRINT + " = ?";
1244		}
1245		if (own != null) {
1246			selectionArgs.add(own ? "1" : "0");
1247			selectionString += " AND " + SQLiteAxolotlStore.OWN + " = ?";
1248		}
1249		Cursor cursor = db.query(SQLiteAxolotlStore.IDENTITIES_TABLENAME,
1250				columns,
1251				selectionString,
1252				selectionArgs.toArray(new String[selectionArgs.size()]),
1253				null, null, null);
1254
1255		return cursor;
1256	}
1257
1258	public IdentityKeyPair loadOwnIdentityKeyPair(Account account) {
1259		SQLiteDatabase db = getReadableDatabase();
1260		return loadOwnIdentityKeyPair(db, account);
1261	}
1262
1263	private IdentityKeyPair loadOwnIdentityKeyPair(SQLiteDatabase db, Account account) {
1264		String name = account.getJid().toBareJid().toPreppedString();
1265		IdentityKeyPair identityKeyPair = null;
1266		Cursor cursor = getIdentityKeyCursor(db, account, name, true);
1267		if (cursor.getCount() != 0) {
1268			cursor.moveToFirst();
1269			try {
1270				identityKeyPair = new IdentityKeyPair(Base64.decode(cursor.getString(cursor.getColumnIndex(SQLiteAxolotlStore.KEY)), Base64.DEFAULT));
1271			} catch (InvalidKeyException e) {
1272				Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Encountered invalid IdentityKey in database for account" + account.getJid().toBareJid() + ", address: " + name);
1273			}
1274		}
1275		cursor.close();
1276
1277		return identityKeyPair;
1278	}
1279
1280	public Set<IdentityKey> loadIdentityKeys(Account account, String name) {
1281		return loadIdentityKeys(account, name, null);
1282	}
1283
1284	public Set<IdentityKey> loadIdentityKeys(Account account, String name, FingerprintStatus status) {
1285		Set<IdentityKey> identityKeys = new HashSet<>();
1286		Cursor cursor = getIdentityKeyCursor(account, name, false);
1287
1288		while (cursor.moveToNext()) {
1289			if (status != null && !FingerprintStatus.fromCursor(cursor).equals(status)) {
1290				continue;
1291			}
1292			try {
1293				String key = cursor.getString(cursor.getColumnIndex(SQLiteAxolotlStore.KEY));
1294				if (key != null) {
1295					identityKeys.add(new IdentityKey(Base64.decode(key, Base64.DEFAULT), 0));
1296				} else {
1297					Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Missing key (possibly preverified) in database for account" + account.getJid().toBareJid() + ", address: " + name);
1298				}
1299			} catch (InvalidKeyException e) {
1300				Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Encountered invalid IdentityKey in database for account" + account.getJid().toBareJid() + ", address: " + name);
1301			}
1302		}
1303		cursor.close();
1304
1305		return identityKeys;
1306	}
1307
1308	public long numTrustedKeys(Account account, String name) {
1309		SQLiteDatabase db = getReadableDatabase();
1310		String[] args = {
1311				account.getUuid(),
1312				name,
1313				FingerprintStatus.Trust.TRUSTED.toString(),
1314				FingerprintStatus.Trust.VERIFIED.toString(),
1315				FingerprintStatus.Trust.VERIFIED_X509.toString()
1316		};
1317		return DatabaseUtils.queryNumEntries(db, SQLiteAxolotlStore.IDENTITIES_TABLENAME,
1318				SQLiteAxolotlStore.ACCOUNT + " = ?"
1319						+ " AND " + SQLiteAxolotlStore.NAME + " = ?"
1320						+ " AND (" + SQLiteAxolotlStore.TRUST + " = ? OR " + SQLiteAxolotlStore.TRUST + " = ? OR " +SQLiteAxolotlStore.TRUST +" = ?)"
1321						+ " AND " +SQLiteAxolotlStore.ACTIVE + " > 0",
1322				args
1323		);
1324	}
1325
1326	private void storeIdentityKey(Account account, String name, boolean own, String fingerprint, String base64Serialized, FingerprintStatus status) {
1327		SQLiteDatabase db = this.getWritableDatabase();
1328		ContentValues values = new ContentValues();
1329		values.put(SQLiteAxolotlStore.ACCOUNT, account.getUuid());
1330		values.put(SQLiteAxolotlStore.NAME, name);
1331		values.put(SQLiteAxolotlStore.OWN, own ? 1 : 0);
1332		values.put(SQLiteAxolotlStore.FINGERPRINT, fingerprint);
1333		values.put(SQLiteAxolotlStore.KEY, base64Serialized);
1334		values.putAll(status.toContentValues());
1335		String where = SQLiteAxolotlStore.ACCOUNT+"=? AND "+SQLiteAxolotlStore.NAME+"=? AND "+SQLiteAxolotlStore.FINGERPRINT+" =?";
1336		String[] whereArgs = {account.getUuid(),name,fingerprint};
1337		int rows = db.update(SQLiteAxolotlStore.IDENTITIES_TABLENAME,values,where,whereArgs);
1338		if (rows == 0) {
1339			db.insert(SQLiteAxolotlStore.IDENTITIES_TABLENAME, null, values);
1340		}
1341	}
1342
1343	public void storePreVerification(Account account, String name, String fingerprint, FingerprintStatus status) {
1344		SQLiteDatabase db = this.getWritableDatabase();
1345		ContentValues values = new ContentValues();
1346		values.put(SQLiteAxolotlStore.ACCOUNT, account.getUuid());
1347		values.put(SQLiteAxolotlStore.NAME, name);
1348		values.put(SQLiteAxolotlStore.OWN, 0);
1349		values.put(SQLiteAxolotlStore.FINGERPRINT, fingerprint);
1350		values.putAll(status.toContentValues());
1351		db.insert(SQLiteAxolotlStore.IDENTITIES_TABLENAME, null, values);
1352	}
1353
1354	public FingerprintStatus getFingerprintStatus(Account account, String fingerprint) {
1355		Cursor cursor = getIdentityKeyCursor(account, fingerprint);
1356		final FingerprintStatus status;
1357		if (cursor.getCount() > 0) {
1358			cursor.moveToFirst();
1359			status = FingerprintStatus.fromCursor(cursor);
1360		} else {
1361			status = null;
1362		}
1363		cursor.close();
1364		return status;
1365	}
1366
1367	public boolean setIdentityKeyTrust(Account account, String fingerprint, FingerprintStatus fingerprintStatus) {
1368		SQLiteDatabase db = this.getWritableDatabase();
1369		return setIdentityKeyTrust(db, account, fingerprint, fingerprintStatus);
1370	}
1371
1372	private boolean setIdentityKeyTrust(SQLiteDatabase db, Account account, String fingerprint, FingerprintStatus status) {
1373		String[] selectionArgs = {
1374				account.getUuid(),
1375				fingerprint
1376		};
1377		int rows = db.update(SQLiteAxolotlStore.IDENTITIES_TABLENAME, status.toContentValues(),
1378				SQLiteAxolotlStore.ACCOUNT + " = ? AND "
1379						+ SQLiteAxolotlStore.FINGERPRINT + " = ? ",
1380				selectionArgs);
1381		return rows == 1;
1382	}
1383
1384	public boolean setIdentityKeyCertificate(Account account, String fingerprint, X509Certificate x509Certificate) {
1385		SQLiteDatabase db = this.getWritableDatabase();
1386		String[] selectionArgs = {
1387				account.getUuid(),
1388				fingerprint
1389		};
1390		try {
1391			ContentValues values = new ContentValues();
1392			values.put(SQLiteAxolotlStore.CERTIFICATE, x509Certificate.getEncoded());
1393			return db.update(SQLiteAxolotlStore.IDENTITIES_TABLENAME, values,
1394					SQLiteAxolotlStore.ACCOUNT + " = ? AND "
1395							+ SQLiteAxolotlStore.FINGERPRINT + " = ? ",
1396					selectionArgs) == 1;
1397		} catch (CertificateEncodingException e) {
1398			Log.d(Config.LOGTAG, "could not encode certificate");
1399			return false;
1400		}
1401	}
1402
1403	public X509Certificate getIdentityKeyCertifcate(Account account, String fingerprint) {
1404		SQLiteDatabase db = this.getReadableDatabase();
1405		String[] selectionArgs = {
1406				account.getUuid(),
1407				fingerprint
1408		};
1409		String[] colums = {SQLiteAxolotlStore.CERTIFICATE};
1410		String selection = SQLiteAxolotlStore.ACCOUNT + " = ? AND " + SQLiteAxolotlStore.FINGERPRINT + " = ? ";
1411		Cursor cursor = db.query(SQLiteAxolotlStore.IDENTITIES_TABLENAME, colums, selection, selectionArgs, null, null, null);
1412		if (cursor.getCount() < 1) {
1413			return null;
1414		} else {
1415			cursor.moveToFirst();
1416			byte[] certificate = cursor.getBlob(cursor.getColumnIndex(SQLiteAxolotlStore.CERTIFICATE));
1417			cursor.close();
1418			if (certificate == null || certificate.length == 0) {
1419				return null;
1420			}
1421			try {
1422				CertificateFactory certificateFactory = CertificateFactory.getInstance("X.509");
1423				return (X509Certificate) certificateFactory.generateCertificate(new ByteArrayInputStream(certificate));
1424			} catch (CertificateException e) {
1425				Log.d(Config.LOGTAG,"certificate exception "+e.getMessage());
1426				return null;
1427			}
1428		}
1429	}
1430
1431	public void storeIdentityKey(Account account, String name, IdentityKey identityKey, FingerprintStatus status) {
1432		storeIdentityKey(account, name, false, CryptoHelper.bytesToHex(identityKey.getPublicKey().serialize()), Base64.encodeToString(identityKey.serialize(), Base64.DEFAULT), status);
1433	}
1434
1435	public void storeOwnIdentityKeyPair(Account account, IdentityKeyPair identityKeyPair) {
1436		storeIdentityKey(account, account.getJid().toBareJid().toPreppedString(), true, CryptoHelper.bytesToHex(identityKeyPair.getPublicKey().serialize()), Base64.encodeToString(identityKeyPair.serialize(), Base64.DEFAULT), FingerprintStatus.createActiveVerified(false));
1437	}
1438
1439
1440	private void recreateAxolotlDb(SQLiteDatabase db) {
1441		Log.d(Config.LOGTAG, AxolotlService.LOGPREFIX + " : " + ">>> (RE)CREATING AXOLOTL DATABASE <<<");
1442		db.execSQL("DROP TABLE IF EXISTS " + SQLiteAxolotlStore.SESSION_TABLENAME);
1443		db.execSQL(CREATE_SESSIONS_STATEMENT);
1444		db.execSQL("DROP TABLE IF EXISTS " + SQLiteAxolotlStore.PREKEY_TABLENAME);
1445		db.execSQL(CREATE_PREKEYS_STATEMENT);
1446		db.execSQL("DROP TABLE IF EXISTS " + SQLiteAxolotlStore.SIGNED_PREKEY_TABLENAME);
1447		db.execSQL(CREATE_SIGNED_PREKEYS_STATEMENT);
1448		db.execSQL("DROP TABLE IF EXISTS " + SQLiteAxolotlStore.IDENTITIES_TABLENAME);
1449		db.execSQL(CREATE_IDENTITIES_STATEMENT);
1450	}
1451
1452	public void wipeAxolotlDb(Account account) {
1453		String accountName = account.getUuid();
1454		Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + ">>> WIPING AXOLOTL DATABASE FOR ACCOUNT " + accountName + " <<<");
1455		SQLiteDatabase db = this.getWritableDatabase();
1456		String[] deleteArgs = {
1457				accountName
1458		};
1459		db.delete(SQLiteAxolotlStore.SESSION_TABLENAME,
1460				SQLiteAxolotlStore.ACCOUNT + " = ?",
1461				deleteArgs);
1462		db.delete(SQLiteAxolotlStore.PREKEY_TABLENAME,
1463				SQLiteAxolotlStore.ACCOUNT + " = ?",
1464				deleteArgs);
1465		db.delete(SQLiteAxolotlStore.SIGNED_PREKEY_TABLENAME,
1466				SQLiteAxolotlStore.ACCOUNT + " = ?",
1467				deleteArgs);
1468		db.delete(SQLiteAxolotlStore.IDENTITIES_TABLENAME,
1469				SQLiteAxolotlStore.ACCOUNT + " = ?",
1470				deleteArgs);
1471	}
1472
1473	public List<ShortcutService.FrequentContact> getFrequentContacts(int days) {
1474		SQLiteDatabase db = this.getReadableDatabase();
1475		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;";
1476		String[] whereArgs = new String[]{String.valueOf(System.currentTimeMillis() - (Config.MILLISECONDS_IN_DAY * days))};
1477		Cursor cursor = db.rawQuery(SQL,whereArgs);
1478		ArrayList<ShortcutService.FrequentContact> contacts = new ArrayList<>();
1479		while(cursor.moveToNext()) {
1480			try {
1481				contacts.add(new ShortcutService.FrequentContact(cursor.getString(0), Jid.fromString(cursor.getString(1))));
1482			} catch (Exception e) {
1483				Log.d(Config.LOGTAG,e.getMessage());
1484			}
1485		}
1486		cursor.close();
1487		return contacts;
1488	}
1489}