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.util.Base64;
  11import android.util.Log;
  12import android.util.Pair;
  13
  14import org.whispersystems.libaxolotl.AxolotlAddress;
  15import org.whispersystems.libaxolotl.IdentityKey;
  16import org.whispersystems.libaxolotl.IdentityKeyPair;
  17import org.whispersystems.libaxolotl.InvalidKeyException;
  18import org.whispersystems.libaxolotl.state.PreKeyRecord;
  19import org.whispersystems.libaxolotl.state.SessionRecord;
  20import org.whispersystems.libaxolotl.state.SignedPreKeyRecord;
  21
  22import java.io.ByteArrayInputStream;
  23import java.io.IOException;
  24import java.security.cert.CertificateEncodingException;
  25import java.security.cert.CertificateException;
  26import java.security.cert.CertificateFactory;
  27import java.security.cert.X509Certificate;
  28import java.util.ArrayList;
  29import java.util.HashSet;
  30import java.util.Iterator;
  31import java.util.List;
  32import java.util.Set;
  33import java.util.concurrent.CopyOnWriteArrayList;
  34import org.json.JSONException;
  35
  36import eu.siacs.conversations.Config;
  37import eu.siacs.conversations.crypto.axolotl.AxolotlService;
  38import eu.siacs.conversations.crypto.axolotl.SQLiteAxolotlStore;
  39import eu.siacs.conversations.crypto.axolotl.XmppAxolotlSession;
  40import eu.siacs.conversations.entities.Account;
  41import eu.siacs.conversations.entities.Contact;
  42import eu.siacs.conversations.entities.Conversation;
  43import eu.siacs.conversations.entities.Message;
  44import eu.siacs.conversations.entities.Roster;
  45import eu.siacs.conversations.entities.ServiceDiscoveryResult;
  46import eu.siacs.conversations.xmpp.jid.InvalidJidException;
  47import eu.siacs.conversations.xmpp.jid.Jid;
  48
  49public class DatabaseBackend extends SQLiteOpenHelper {
  50
  51	private static DatabaseBackend instance = null;
  52
  53	private static final String DATABASE_NAME = "history";
  54	private static final int DATABASE_VERSION = 24;
  55
  56	private static String CREATE_CONTATCS_STATEMENT = "create table "
  57			+ Contact.TABLENAME + "(" + Contact.ACCOUNT + " TEXT, "
  58			+ Contact.SERVERNAME + " TEXT, " + Contact.SYSTEMNAME + " TEXT,"
  59			+ Contact.JID + " TEXT," + Contact.KEYS + " TEXT,"
  60			+ Contact.PHOTOURI + " TEXT," + Contact.OPTIONS + " NUMBER,"
  61			+ Contact.SYSTEMACCOUNT + " NUMBER, " + Contact.AVATAR + " TEXT, "
  62			+ Contact.LAST_PRESENCE + " TEXT, " + Contact.LAST_TIME + " NUMBER, "
  63			+ Contact.GROUPS + " TEXT, FOREIGN KEY(" + Contact.ACCOUNT + ") REFERENCES "
  64			+ Account.TABLENAME + "(" + Account.UUID
  65			+ ") ON DELETE CASCADE, UNIQUE(" + Contact.ACCOUNT + ", "
  66			+ Contact.JID + ") ON CONFLICT REPLACE);";
  67
  68	private static String CREATE_DISCOVERY_RESULTS_STATEMENT = "create table "
  69			+ ServiceDiscoveryResult.TABLENAME + "("
  70			+ ServiceDiscoveryResult.HASH + " TEXT, "
  71			+ ServiceDiscoveryResult.VER + " TEXT, "
  72			+ ServiceDiscoveryResult.RESULT + " TEXT, "
  73			+ "UNIQUE(" + ServiceDiscoveryResult.HASH + ", "
  74			+ ServiceDiscoveryResult.VER + ") ON CONFLICT REPLACE);";
  75
  76	private static String CREATE_PREKEYS_STATEMENT = "CREATE TABLE "
  77			+ SQLiteAxolotlStore.PREKEY_TABLENAME + "("
  78			+ SQLiteAxolotlStore.ACCOUNT + " TEXT,  "
  79			+ SQLiteAxolotlStore.ID + " INTEGER, "
  80			+ SQLiteAxolotlStore.KEY + " TEXT, FOREIGN KEY("
  81			+ SQLiteAxolotlStore.ACCOUNT
  82			+ ") REFERENCES " + Account.TABLENAME + "(" + Account.UUID + ") ON DELETE CASCADE, "
  83			+ "UNIQUE( " + SQLiteAxolotlStore.ACCOUNT + ", "
  84			+ SQLiteAxolotlStore.ID
  85			+ ") ON CONFLICT REPLACE"
  86			+ ");";
  87
  88	private static String CREATE_SIGNED_PREKEYS_STATEMENT = "CREATE TABLE "
  89			+ SQLiteAxolotlStore.SIGNED_PREKEY_TABLENAME + "("
  90			+ SQLiteAxolotlStore.ACCOUNT + " TEXT,  "
  91			+ SQLiteAxolotlStore.ID + " INTEGER, "
  92			+ SQLiteAxolotlStore.KEY + " TEXT, FOREIGN KEY("
  93			+ SQLiteAxolotlStore.ACCOUNT
  94			+ ") REFERENCES " + Account.TABLENAME + "(" + Account.UUID + ") ON DELETE CASCADE, "
  95			+ "UNIQUE( " + SQLiteAxolotlStore.ACCOUNT + ", "
  96			+ SQLiteAxolotlStore.ID
  97			+ ") ON CONFLICT REPLACE" +
  98			");";
  99
 100	private static String CREATE_SESSIONS_STATEMENT = "CREATE TABLE "
 101			+ SQLiteAxolotlStore.SESSION_TABLENAME + "("
 102			+ SQLiteAxolotlStore.ACCOUNT + " TEXT,  "
 103			+ SQLiteAxolotlStore.NAME + " TEXT, "
 104			+ SQLiteAxolotlStore.DEVICE_ID + " INTEGER, "
 105			+ SQLiteAxolotlStore.KEY + " TEXT, FOREIGN KEY("
 106			+ SQLiteAxolotlStore.ACCOUNT
 107			+ ") REFERENCES " + Account.TABLENAME + "(" + Account.UUID + ") ON DELETE CASCADE, "
 108			+ "UNIQUE( " + SQLiteAxolotlStore.ACCOUNT + ", "
 109			+ SQLiteAxolotlStore.NAME + ", "
 110			+ SQLiteAxolotlStore.DEVICE_ID
 111			+ ") ON CONFLICT REPLACE"
 112			+ ");";
 113
 114	private static String CREATE_IDENTITIES_STATEMENT = "CREATE TABLE "
 115			+ SQLiteAxolotlStore.IDENTITIES_TABLENAME + "("
 116			+ SQLiteAxolotlStore.ACCOUNT + " TEXT,  "
 117			+ SQLiteAxolotlStore.NAME + " TEXT, "
 118			+ SQLiteAxolotlStore.OWN + " INTEGER, "
 119			+ SQLiteAxolotlStore.FINGERPRINT + " TEXT, "
 120			+ SQLiteAxolotlStore.CERTIFICATE + " BLOB, "
 121			+ SQLiteAxolotlStore.TRUSTED + " 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.FINGERPRINT
 128			+ ") ON CONFLICT IGNORE"
 129			+ ");";
 130
 131	private DatabaseBackend(Context context) {
 132		super(context, DATABASE_NAME, null, DATABASE_VERSION);
 133	}
 134
 135	@Override
 136	public void onCreate(SQLiteDatabase db) {
 137		db.execSQL("PRAGMA foreign_keys=ON;");
 138		db.execSQL("create table " + Account.TABLENAME + "(" + Account.UUID
 139				+ " TEXT PRIMARY KEY," + Account.USERNAME + " TEXT,"
 140				+ Account.SERVER + " TEXT," + Account.PASSWORD + " TEXT,"
 141				+ Account.DISPLAY_NAME + " TEXT, "
 142				+ Account.ROSTERVERSION + " TEXT," + Account.OPTIONS
 143				+ " NUMBER, " + Account.AVATAR + " TEXT, " + Account.KEYS
 144				+ " TEXT, " + Account.HOSTNAME + " TEXT, " + Account.PORT + " NUMBER DEFAULT 5222)");
 145		db.execSQL("create table " + Conversation.TABLENAME + " ("
 146				+ Conversation.UUID + " TEXT PRIMARY KEY, " + Conversation.NAME
 147				+ " TEXT, " + Conversation.CONTACT + " TEXT, "
 148				+ Conversation.ACCOUNT + " TEXT, " + Conversation.CONTACTJID
 149				+ " TEXT, " + Conversation.CREATED + " NUMBER, "
 150				+ Conversation.STATUS + " NUMBER, " + Conversation.MODE
 151				+ " NUMBER, " + Conversation.ATTRIBUTES + " TEXT, FOREIGN KEY("
 152				+ Conversation.ACCOUNT + ") REFERENCES " + Account.TABLENAME
 153				+ "(" + Account.UUID + ") ON DELETE CASCADE);");
 154		db.execSQL("create table " + Message.TABLENAME + "( " + Message.UUID
 155				+ " TEXT PRIMARY KEY, " + Message.CONVERSATION + " TEXT, "
 156				+ Message.TIME_SENT + " NUMBER, " + Message.COUNTERPART
 157				+ " TEXT, " + Message.TRUE_COUNTERPART + " TEXT,"
 158				+ Message.BODY + " TEXT, " + Message.ENCRYPTION + " NUMBER, "
 159				+ Message.STATUS + " NUMBER," + Message.TYPE + " NUMBER, "
 160				+ Message.RELATIVE_FILE_PATH + " TEXT, "
 161				+ Message.SERVER_MSG_ID + " TEXT, "
 162				+ Message.FINGERPRINT + " TEXT, "
 163				+ Message.CARBON + " INTEGER, "
 164				+ Message.EDITED + " TEXT, "
 165				+ Message.READ + " NUMBER DEFAULT 1, "
 166				+ Message.REMOTE_MSG_ID + " TEXT, FOREIGN KEY("
 167				+ Message.CONVERSATION + ") REFERENCES "
 168				+ Conversation.TABLENAME + "(" + Conversation.UUID
 169				+ ") ON DELETE CASCADE);");
 170
 171		db.execSQL(CREATE_CONTATCS_STATEMENT);
 172		db.execSQL(CREATE_DISCOVERY_RESULTS_STATEMENT);
 173		db.execSQL(CREATE_SESSIONS_STATEMENT);
 174		db.execSQL(CREATE_PREKEYS_STATEMENT);
 175		db.execSQL(CREATE_SIGNED_PREKEYS_STATEMENT);
 176		db.execSQL(CREATE_IDENTITIES_STATEMENT);
 177	}
 178
 179	@Override
 180	public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
 181		if (oldVersion < 2 && newVersion >= 2) {
 182			db.execSQL("update " + Account.TABLENAME + " set "
 183					+ Account.OPTIONS + " = " + Account.OPTIONS + " | 8");
 184		}
 185		if (oldVersion < 3 && newVersion >= 3) {
 186			db.execSQL("ALTER TABLE " + Message.TABLENAME + " ADD COLUMN "
 187					+ Message.TYPE + " NUMBER");
 188		}
 189		if (oldVersion < 5 && newVersion >= 5) {
 190			db.execSQL("DROP TABLE " + Contact.TABLENAME);
 191			db.execSQL(CREATE_CONTATCS_STATEMENT);
 192			db.execSQL("UPDATE " + Account.TABLENAME + " SET "
 193					+ Account.ROSTERVERSION + " = NULL");
 194		}
 195		if (oldVersion < 6 && newVersion >= 6) {
 196			db.execSQL("ALTER TABLE " + Message.TABLENAME + " ADD COLUMN "
 197					+ Message.TRUE_COUNTERPART + " TEXT");
 198		}
 199		if (oldVersion < 7 && newVersion >= 7) {
 200			db.execSQL("ALTER TABLE " + Message.TABLENAME + " ADD COLUMN "
 201					+ Message.REMOTE_MSG_ID + " TEXT");
 202			db.execSQL("ALTER TABLE " + Contact.TABLENAME + " ADD COLUMN "
 203					+ Contact.AVATAR + " TEXT");
 204			db.execSQL("ALTER TABLE " + Account.TABLENAME + " ADD COLUMN "
 205					+ Account.AVATAR + " TEXT");
 206		}
 207		if (oldVersion < 8 && newVersion >= 8) {
 208			db.execSQL("ALTER TABLE " + Conversation.TABLENAME + " ADD COLUMN "
 209					+ Conversation.ATTRIBUTES + " TEXT");
 210		}
 211		if (oldVersion < 9 && newVersion >= 9) {
 212			db.execSQL("ALTER TABLE " + Contact.TABLENAME + " ADD COLUMN "
 213					+ Contact.LAST_TIME + " NUMBER");
 214			db.execSQL("ALTER TABLE " + Contact.TABLENAME + " ADD COLUMN "
 215					+ Contact.LAST_PRESENCE + " TEXT");
 216		}
 217		if (oldVersion < 10 && newVersion >= 10) {
 218			db.execSQL("ALTER TABLE " + Message.TABLENAME + " ADD COLUMN "
 219					+ Message.RELATIVE_FILE_PATH + " TEXT");
 220		}
 221		if (oldVersion < 11 && newVersion >= 11) {
 222			db.execSQL("ALTER TABLE " + Contact.TABLENAME + " ADD COLUMN "
 223					+ Contact.GROUPS + " TEXT");
 224			db.execSQL("delete from " + Contact.TABLENAME);
 225			db.execSQL("update " + Account.TABLENAME + " set " + Account.ROSTERVERSION + " = NULL");
 226		}
 227		if (oldVersion < 12 && newVersion >= 12) {
 228			db.execSQL("ALTER TABLE " + Message.TABLENAME + " ADD COLUMN "
 229					+ Message.SERVER_MSG_ID + " TEXT");
 230		}
 231		if (oldVersion < 13 && newVersion >= 13) {
 232			db.execSQL("delete from " + Contact.TABLENAME);
 233			db.execSQL("update " + Account.TABLENAME + " set " + Account.ROSTERVERSION + " = NULL");
 234		}
 235		if (oldVersion < 14 && newVersion >= 14) {
 236			// migrate db to new, canonicalized JID domainpart representation
 237
 238			// Conversation table
 239			Cursor cursor = db.rawQuery("select * from " + Conversation.TABLENAME, new String[0]);
 240			while (cursor.moveToNext()) {
 241				String newJid;
 242				try {
 243					newJid = Jid.fromString(
 244							cursor.getString(cursor.getColumnIndex(Conversation.CONTACTJID))
 245					).toString();
 246				} catch (InvalidJidException ignored) {
 247					Log.e(Config.LOGTAG, "Failed to migrate Conversation CONTACTJID "
 248							+ cursor.getString(cursor.getColumnIndex(Conversation.CONTACTJID))
 249							+ ": " + ignored + ". Skipping...");
 250					continue;
 251				}
 252
 253				String updateArgs[] = {
 254						newJid,
 255						cursor.getString(cursor.getColumnIndex(Conversation.UUID)),
 256				};
 257				db.execSQL("update " + Conversation.TABLENAME
 258						+ " set " + Conversation.CONTACTJID + " = ? "
 259						+ " where " + Conversation.UUID + " = ?", updateArgs);
 260			}
 261			cursor.close();
 262
 263			// Contact table
 264			cursor = db.rawQuery("select * from " + Contact.TABLENAME, new String[0]);
 265			while (cursor.moveToNext()) {
 266				String newJid;
 267				try {
 268					newJid = Jid.fromString(
 269							cursor.getString(cursor.getColumnIndex(Contact.JID))
 270					).toString();
 271				} catch (InvalidJidException ignored) {
 272					Log.e(Config.LOGTAG, "Failed to migrate Contact JID "
 273							+ cursor.getString(cursor.getColumnIndex(Contact.JID))
 274							+ ": " + ignored + ". Skipping...");
 275					continue;
 276				}
 277
 278				String updateArgs[] = {
 279						newJid,
 280						cursor.getString(cursor.getColumnIndex(Contact.ACCOUNT)),
 281						cursor.getString(cursor.getColumnIndex(Contact.JID)),
 282				};
 283				db.execSQL("update " + Contact.TABLENAME
 284						+ " set " + Contact.JID + " = ? "
 285						+ " where " + Contact.ACCOUNT + " = ? "
 286						+ " AND " + Contact.JID + " = ?", updateArgs);
 287			}
 288			cursor.close();
 289
 290			// Account table
 291			cursor = db.rawQuery("select * from " + Account.TABLENAME, new String[0]);
 292			while (cursor.moveToNext()) {
 293				String newServer;
 294				try {
 295					newServer = Jid.fromParts(
 296							cursor.getString(cursor.getColumnIndex(Account.USERNAME)),
 297							cursor.getString(cursor.getColumnIndex(Account.SERVER)),
 298							"mobile"
 299					).getDomainpart();
 300				} catch (InvalidJidException ignored) {
 301					Log.e(Config.LOGTAG, "Failed to migrate Account SERVER "
 302							+ cursor.getString(cursor.getColumnIndex(Account.SERVER))
 303							+ ": " + ignored + ". Skipping...");
 304					continue;
 305				}
 306
 307				String updateArgs[] = {
 308						newServer,
 309						cursor.getString(cursor.getColumnIndex(Account.UUID)),
 310				};
 311				db.execSQL("update " + Account.TABLENAME
 312						+ " set " + Account.SERVER + " = ? "
 313						+ " where " + Account.UUID + " = ?", updateArgs);
 314			}
 315			cursor.close();
 316		}
 317		if (oldVersion < 15 && newVersion >= 15) {
 318			recreateAxolotlDb(db);
 319			db.execSQL("ALTER TABLE " + Message.TABLENAME + " ADD COLUMN "
 320					+ Message.FINGERPRINT + " TEXT");
 321		}
 322		if (oldVersion < 16 && newVersion >= 16) {
 323			db.execSQL("ALTER TABLE " + Message.TABLENAME + " ADD COLUMN "
 324					+ Message.CARBON + " INTEGER");
 325		}
 326		if (oldVersion < 19 && newVersion >= 19) {
 327			db.execSQL("ALTER TABLE " + Account.TABLENAME + " ADD COLUMN " + Account.DISPLAY_NAME + " TEXT");
 328		}
 329		if (oldVersion < 20 && newVersion >= 20) {
 330			db.execSQL("ALTER TABLE " + Account.TABLENAME + " ADD COLUMN " + Account.HOSTNAME + " TEXT");
 331			db.execSQL("ALTER TABLE " + Account.TABLENAME + " ADD COLUMN " + Account.PORT + " NUMBER DEFAULT 5222");
 332		}
 333		/* Any migrations that alter the Account table need to happen BEFORE this migration, as it
 334		 * depends on account de-serialization.
 335		 */
 336		if (oldVersion < 17 && newVersion >= 17) {
 337			List<Account> accounts = getAccounts(db);
 338			for (Account account : accounts) {
 339				String ownDeviceIdString = account.getKey(SQLiteAxolotlStore.JSONKEY_REGISTRATION_ID);
 340				if (ownDeviceIdString == null) {
 341					continue;
 342				}
 343				int ownDeviceId = Integer.valueOf(ownDeviceIdString);
 344				AxolotlAddress ownAddress = new AxolotlAddress(account.getJid().toBareJid().toString(), ownDeviceId);
 345				deleteSession(db, account, ownAddress);
 346				IdentityKeyPair identityKeyPair = loadOwnIdentityKeyPair(db, account);
 347				if (identityKeyPair != null) {
 348					setIdentityKeyTrust(db, account, identityKeyPair.getPublicKey().getFingerprint().replaceAll("\\s", ""), XmppAxolotlSession.Trust.TRUSTED);
 349				} else {
 350					Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": could not load own identity key pair");
 351				}
 352			}
 353		}
 354		if (oldVersion < 18 && newVersion >= 18) {
 355			db.execSQL("ALTER TABLE " + Message.TABLENAME + " ADD COLUMN " + Message.READ + " NUMBER DEFAULT 1");
 356		}
 357
 358		if (oldVersion < 21 && newVersion >= 21) {
 359			List<Account> accounts = getAccounts(db);
 360			for (Account account : accounts) {
 361				account.unsetPgpSignature();
 362				db.update(Account.TABLENAME, account.getContentValues(), Account.UUID
 363						+ "=?", new String[]{account.getUuid()});
 364			}
 365		}
 366
 367		if (oldVersion < 22 && newVersion >= 22) {
 368			db.execSQL("ALTER TABLE " + SQLiteAxolotlStore.IDENTITIES_TABLENAME + " ADD COLUMN " + SQLiteAxolotlStore.CERTIFICATE);
 369		}
 370
 371		if (oldVersion < 23 && newVersion >= 23) {
 372			db.execSQL(CREATE_DISCOVERY_RESULTS_STATEMENT);
 373		}
 374
 375		if (oldVersion < 24 && newVersion >= 24) {
 376			db.execSQL("ALTER TABLE " + Message.TABLENAME + " ADD COLUMN " + Message.EDITED + " TEXT");
 377		}
 378	}
 379
 380	public static synchronized DatabaseBackend getInstance(Context context) {
 381		if (instance == null) {
 382			instance = new DatabaseBackend(context);
 383		}
 384		return instance;
 385	}
 386
 387	public void createConversation(Conversation conversation) {
 388		SQLiteDatabase db = this.getWritableDatabase();
 389		db.insert(Conversation.TABLENAME, null, conversation.getContentValues());
 390	}
 391
 392	public void createMessage(Message message) {
 393		SQLiteDatabase db = this.getWritableDatabase();
 394		db.insert(Message.TABLENAME, null, message.getContentValues());
 395	}
 396
 397	public void createAccount(Account account) {
 398		SQLiteDatabase db = this.getWritableDatabase();
 399		db.insert(Account.TABLENAME, null, account.getContentValues());
 400	}
 401
 402	public void insertDiscoveryResult(ServiceDiscoveryResult result) {
 403		SQLiteDatabase db = this.getWritableDatabase();
 404		db.insert(ServiceDiscoveryResult.TABLENAME, null, result.getContentValues());
 405	}
 406
 407	public ServiceDiscoveryResult findDiscoveryResult(final String hash, final String ver) {
 408		SQLiteDatabase db = this.getReadableDatabase();
 409		String[] selectionArgs = {hash, ver};
 410		Cursor cursor = db.query(ServiceDiscoveryResult.TABLENAME, null,
 411				ServiceDiscoveryResult.HASH + "=? AND " + ServiceDiscoveryResult.VER + "=?",
 412				selectionArgs, null, null, null);
 413		if (cursor.getCount() == 0)
 414			return null;
 415		cursor.moveToFirst();
 416
 417		ServiceDiscoveryResult result = null;
 418		try {
 419			result = new ServiceDiscoveryResult(cursor);
 420		} catch (JSONException e) { /* result is still null */ }
 421
 422		cursor.close();
 423		return result;
 424	}
 425
 426	public CopyOnWriteArrayList<Conversation> getConversations(int status) {
 427		CopyOnWriteArrayList<Conversation> list = new CopyOnWriteArrayList<>();
 428		SQLiteDatabase db = this.getReadableDatabase();
 429		String[] selectionArgs = {Integer.toString(status)};
 430		Cursor cursor = db.rawQuery("select * from " + Conversation.TABLENAME
 431				+ " where " + Conversation.STATUS + " = ? order by "
 432				+ Conversation.CREATED + " desc", selectionArgs);
 433		while (cursor.moveToNext()) {
 434			list.add(Conversation.fromCursor(cursor));
 435		}
 436		cursor.close();
 437		return list;
 438	}
 439
 440	public ArrayList<Message> getMessages(Conversation conversations, int limit) {
 441		return getMessages(conversations, limit, -1);
 442	}
 443
 444	public ArrayList<Message> getMessages(Conversation conversation, int limit,
 445										  long timestamp) {
 446		ArrayList<Message> list = new ArrayList<>();
 447		SQLiteDatabase db = this.getReadableDatabase();
 448		Cursor cursor;
 449		if (timestamp == -1) {
 450			String[] selectionArgs = {conversation.getUuid()};
 451			cursor = db.query(Message.TABLENAME, null, Message.CONVERSATION
 452					+ "=?", selectionArgs, null, null, Message.TIME_SENT
 453					+ " DESC", String.valueOf(limit));
 454		} else {
 455			String[] selectionArgs = {conversation.getUuid(),
 456					Long.toString(timestamp)};
 457			cursor = db.query(Message.TABLENAME, null, Message.CONVERSATION
 458							+ "=? and " + Message.TIME_SENT + "<?", selectionArgs,
 459					null, null, Message.TIME_SENT + " DESC",
 460					String.valueOf(limit));
 461		}
 462		if (cursor.getCount() > 0) {
 463			cursor.moveToLast();
 464			do {
 465				Message message = Message.fromCursor(cursor);
 466				message.setConversation(conversation);
 467				list.add(message);
 468			} while (cursor.moveToPrevious());
 469		}
 470		cursor.close();
 471		return list;
 472	}
 473
 474	public Iterable<Message> getMessagesIterable(final Conversation conversation) {
 475		return new Iterable<Message>() {
 476			@Override
 477			public Iterator<Message> iterator() {
 478				class MessageIterator implements Iterator<Message> {
 479					SQLiteDatabase db = getReadableDatabase();
 480					String[] selectionArgs = {conversation.getUuid()};
 481					Cursor cursor = db.query(Message.TABLENAME, null, Message.CONVERSATION
 482							+ "=?", selectionArgs, null, null, Message.TIME_SENT
 483							+ " ASC", null);
 484
 485					public MessageIterator() {
 486						cursor.moveToFirst();
 487					}
 488
 489					@Override
 490					public boolean hasNext() {
 491						return !cursor.isAfterLast();
 492					}
 493
 494					@Override
 495					public Message next() {
 496						Message message = Message.fromCursor(cursor);
 497						cursor.moveToNext();
 498						return message;
 499					}
 500
 501					@Override
 502					public void remove() {
 503						throw new UnsupportedOperationException();
 504					}
 505				}
 506				return new MessageIterator();
 507			}
 508		};
 509	}
 510
 511	public Conversation findConversation(final Account account, final Jid contactJid) {
 512		SQLiteDatabase db = this.getReadableDatabase();
 513		String[] selectionArgs = {account.getUuid(),
 514				contactJid.toBareJid().toString() + "/%",
 515				contactJid.toBareJid().toString()
 516		};
 517		Cursor cursor = db.query(Conversation.TABLENAME, null,
 518				Conversation.ACCOUNT + "=? AND (" + Conversation.CONTACTJID
 519						+ " like ? OR " + Conversation.CONTACTJID + "=?)", selectionArgs, null, null, null);
 520		if (cursor.getCount() == 0)
 521			return null;
 522		cursor.moveToFirst();
 523		Conversation conversation = Conversation.fromCursor(cursor);
 524		cursor.close();
 525		return conversation;
 526	}
 527
 528	public void updateConversation(final Conversation conversation) {
 529		final SQLiteDatabase db = this.getWritableDatabase();
 530		final String[] args = {conversation.getUuid()};
 531		db.update(Conversation.TABLENAME, conversation.getContentValues(),
 532				Conversation.UUID + "=?", args);
 533	}
 534
 535	public List<Account> getAccounts() {
 536		SQLiteDatabase db = this.getReadableDatabase();
 537		return getAccounts(db);
 538	}
 539
 540	private List<Account> getAccounts(SQLiteDatabase db) {
 541		List<Account> list = new ArrayList<>();
 542		Cursor cursor = db.query(Account.TABLENAME, null, null, null, null,
 543				null, null);
 544		while (cursor.moveToNext()) {
 545			list.add(Account.fromCursor(cursor));
 546		}
 547		cursor.close();
 548		return list;
 549	}
 550
 551	public void updateAccount(Account account) {
 552		SQLiteDatabase db = this.getWritableDatabase();
 553		String[] args = {account.getUuid()};
 554		db.update(Account.TABLENAME, account.getContentValues(), Account.UUID
 555				+ "=?", args);
 556	}
 557
 558	public void deleteAccount(Account account) {
 559		SQLiteDatabase db = this.getWritableDatabase();
 560		String[] args = {account.getUuid()};
 561		db.delete(Account.TABLENAME, Account.UUID + "=?", args);
 562	}
 563
 564	public boolean hasEnabledAccounts() {
 565		SQLiteDatabase db = this.getReadableDatabase();
 566		Cursor cursor = db.rawQuery("select count(" + Account.UUID + ")  from "
 567				+ Account.TABLENAME + " where not options & (1 <<1)", null);
 568		try {
 569			cursor.moveToFirst();
 570			int count = cursor.getInt(0);
 571			cursor.close();
 572			return (count > 0);
 573		} catch (SQLiteCantOpenDatabaseException e) {
 574			return true; // better safe than sorry
 575		} catch (RuntimeException e) {
 576			return true; // better safe than sorry
 577		}
 578	}
 579
 580	@Override
 581	public SQLiteDatabase getWritableDatabase() {
 582		SQLiteDatabase db = super.getWritableDatabase();
 583		db.execSQL("PRAGMA foreign_keys=ON;");
 584		return db;
 585	}
 586
 587	public void updateMessage(Message message) {
 588		SQLiteDatabase db = this.getWritableDatabase();
 589		String[] args = {message.getUuid()};
 590		db.update(Message.TABLENAME, message.getContentValues(), Message.UUID
 591				+ "=?", args);
 592	}
 593
 594	public void updateMessage(Message message, String uuid) {
 595		SQLiteDatabase db = this.getWritableDatabase();
 596		String[] args = {uuid};
 597		db.update(Message.TABLENAME, message.getContentValues(), Message.UUID
 598				+ "=?", args);
 599	}
 600
 601	public void readRoster(Roster roster) {
 602		SQLiteDatabase db = this.getReadableDatabase();
 603		Cursor cursor;
 604		String args[] = {roster.getAccount().getUuid()};
 605		cursor = db.query(Contact.TABLENAME, null, Contact.ACCOUNT + "=?", args, null, null, null);
 606		while (cursor.moveToNext()) {
 607			roster.initContact(Contact.fromCursor(cursor));
 608		}
 609		cursor.close();
 610	}
 611
 612	public void writeRoster(final Roster roster) {
 613		final Account account = roster.getAccount();
 614		final SQLiteDatabase db = this.getWritableDatabase();
 615		db.beginTransaction();
 616		for (Contact contact : roster.getContacts()) {
 617			if (contact.getOption(Contact.Options.IN_ROSTER)) {
 618				db.insert(Contact.TABLENAME, null, contact.getContentValues());
 619			} else {
 620				String where = Contact.ACCOUNT + "=? AND " + Contact.JID + "=?";
 621				String[] whereArgs = {account.getUuid(), contact.getJid().toString()};
 622				db.delete(Contact.TABLENAME, where, whereArgs);
 623			}
 624		}
 625		db.setTransactionSuccessful();
 626		db.endTransaction();
 627		account.setRosterVersion(roster.getVersion());
 628		updateAccount(account);
 629	}
 630
 631	public void deleteMessagesInConversation(Conversation conversation) {
 632		SQLiteDatabase db = this.getWritableDatabase();
 633		String[] args = {conversation.getUuid()};
 634		db.delete(Message.TABLENAME, Message.CONVERSATION + "=?", args);
 635	}
 636
 637	public Pair<Long, String> getLastMessageReceived(Account account) {
 638		try {
 639			SQLiteDatabase db = this.getReadableDatabase();
 640			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) order by messages.timesent desc limit 1";
 641			String[] args = {account.getUuid()};
 642			Cursor cursor = db.rawQuery(sql, args);
 643			if (cursor.getCount() == 0) {
 644				return null;
 645			} else {
 646				cursor.moveToFirst();
 647				return new Pair<>(cursor.getLong(0), cursor.getString(1));
 648			}
 649		} catch (Exception e) {
 650			return null;
 651		}
 652	}
 653
 654	private Cursor getCursorForSession(Account account, AxolotlAddress contact) {
 655		final SQLiteDatabase db = this.getReadableDatabase();
 656		String[] columns = null;
 657		String[] selectionArgs = {account.getUuid(),
 658				contact.getName(),
 659				Integer.toString(contact.getDeviceId())};
 660		Cursor cursor = db.query(SQLiteAxolotlStore.SESSION_TABLENAME,
 661				columns,
 662				SQLiteAxolotlStore.ACCOUNT + " = ? AND "
 663						+ SQLiteAxolotlStore.NAME + " = ? AND "
 664						+ SQLiteAxolotlStore.DEVICE_ID + " = ? ",
 665				selectionArgs,
 666				null, null, null);
 667
 668		return cursor;
 669	}
 670
 671	public SessionRecord loadSession(Account account, AxolotlAddress contact) {
 672		SessionRecord session = null;
 673		Cursor cursor = getCursorForSession(account, contact);
 674		if (cursor.getCount() != 0) {
 675			cursor.moveToFirst();
 676			try {
 677				session = new SessionRecord(Base64.decode(cursor.getString(cursor.getColumnIndex(SQLiteAxolotlStore.KEY)), Base64.DEFAULT));
 678			} catch (IOException e) {
 679				cursor.close();
 680				throw new AssertionError(e);
 681			}
 682		}
 683		cursor.close();
 684		return session;
 685	}
 686
 687	public List<Integer> getSubDeviceSessions(Account account, AxolotlAddress contact) {
 688		final SQLiteDatabase db = this.getReadableDatabase();
 689		return getSubDeviceSessions(db, account, contact);
 690	}
 691
 692	private List<Integer> getSubDeviceSessions(SQLiteDatabase db, Account account, AxolotlAddress contact) {
 693		List<Integer> devices = new ArrayList<>();
 694		String[] columns = {SQLiteAxolotlStore.DEVICE_ID};
 695		String[] selectionArgs = {account.getUuid(),
 696				contact.getName()};
 697		Cursor cursor = db.query(SQLiteAxolotlStore.SESSION_TABLENAME,
 698				columns,
 699				SQLiteAxolotlStore.ACCOUNT + " = ? AND "
 700						+ SQLiteAxolotlStore.NAME + " = ?",
 701				selectionArgs,
 702				null, null, null);
 703
 704		while (cursor.moveToNext()) {
 705			devices.add(cursor.getInt(
 706					cursor.getColumnIndex(SQLiteAxolotlStore.DEVICE_ID)));
 707		}
 708
 709		cursor.close();
 710		return devices;
 711	}
 712
 713	public boolean containsSession(Account account, AxolotlAddress contact) {
 714		Cursor cursor = getCursorForSession(account, contact);
 715		int count = cursor.getCount();
 716		cursor.close();
 717		return count != 0;
 718	}
 719
 720	public void storeSession(Account account, AxolotlAddress contact, SessionRecord session) {
 721		SQLiteDatabase db = this.getWritableDatabase();
 722		ContentValues values = new ContentValues();
 723		values.put(SQLiteAxolotlStore.NAME, contact.getName());
 724		values.put(SQLiteAxolotlStore.DEVICE_ID, contact.getDeviceId());
 725		values.put(SQLiteAxolotlStore.KEY, Base64.encodeToString(session.serialize(), Base64.DEFAULT));
 726		values.put(SQLiteAxolotlStore.ACCOUNT, account.getUuid());
 727		db.insert(SQLiteAxolotlStore.SESSION_TABLENAME, null, values);
 728	}
 729
 730	public void deleteSession(Account account, AxolotlAddress contact) {
 731		SQLiteDatabase db = this.getWritableDatabase();
 732		deleteSession(db, account, contact);
 733	}
 734
 735	private void deleteSession(SQLiteDatabase db, Account account, AxolotlAddress contact) {
 736		String[] args = {account.getUuid(),
 737				contact.getName(),
 738				Integer.toString(contact.getDeviceId())};
 739		db.delete(SQLiteAxolotlStore.SESSION_TABLENAME,
 740				SQLiteAxolotlStore.ACCOUNT + " = ? AND "
 741						+ SQLiteAxolotlStore.NAME + " = ? AND "
 742						+ SQLiteAxolotlStore.DEVICE_ID + " = ? ",
 743				args);
 744	}
 745
 746	public void deleteAllSessions(Account account, AxolotlAddress contact) {
 747		SQLiteDatabase db = this.getWritableDatabase();
 748		String[] args = {account.getUuid(), contact.getName()};
 749		db.delete(SQLiteAxolotlStore.SESSION_TABLENAME,
 750				SQLiteAxolotlStore.ACCOUNT + "=? AND "
 751						+ SQLiteAxolotlStore.NAME + " = ?",
 752				args);
 753	}
 754
 755	private Cursor getCursorForPreKey(Account account, int preKeyId) {
 756		SQLiteDatabase db = this.getReadableDatabase();
 757		String[] columns = {SQLiteAxolotlStore.KEY};
 758		String[] selectionArgs = {account.getUuid(), Integer.toString(preKeyId)};
 759		Cursor cursor = db.query(SQLiteAxolotlStore.PREKEY_TABLENAME,
 760				columns,
 761				SQLiteAxolotlStore.ACCOUNT + "=? AND "
 762						+ SQLiteAxolotlStore.ID + "=?",
 763				selectionArgs,
 764				null, null, null);
 765
 766		return cursor;
 767	}
 768
 769	public PreKeyRecord loadPreKey(Account account, int preKeyId) {
 770		PreKeyRecord record = null;
 771		Cursor cursor = getCursorForPreKey(account, preKeyId);
 772		if (cursor.getCount() != 0) {
 773			cursor.moveToFirst();
 774			try {
 775				record = new PreKeyRecord(Base64.decode(cursor.getString(cursor.getColumnIndex(SQLiteAxolotlStore.KEY)), Base64.DEFAULT));
 776			} catch (IOException e) {
 777				throw new AssertionError(e);
 778			}
 779		}
 780		cursor.close();
 781		return record;
 782	}
 783
 784	public boolean containsPreKey(Account account, int preKeyId) {
 785		Cursor cursor = getCursorForPreKey(account, preKeyId);
 786		int count = cursor.getCount();
 787		cursor.close();
 788		return count != 0;
 789	}
 790
 791	public void storePreKey(Account account, PreKeyRecord record) {
 792		SQLiteDatabase db = this.getWritableDatabase();
 793		ContentValues values = new ContentValues();
 794		values.put(SQLiteAxolotlStore.ID, record.getId());
 795		values.put(SQLiteAxolotlStore.KEY, Base64.encodeToString(record.serialize(), Base64.DEFAULT));
 796		values.put(SQLiteAxolotlStore.ACCOUNT, account.getUuid());
 797		db.insert(SQLiteAxolotlStore.PREKEY_TABLENAME, null, values);
 798	}
 799
 800	public void deletePreKey(Account account, int preKeyId) {
 801		SQLiteDatabase db = this.getWritableDatabase();
 802		String[] args = {account.getUuid(), Integer.toString(preKeyId)};
 803		db.delete(SQLiteAxolotlStore.PREKEY_TABLENAME,
 804				SQLiteAxolotlStore.ACCOUNT + "=? AND "
 805						+ SQLiteAxolotlStore.ID + "=?",
 806				args);
 807	}
 808
 809	private Cursor getCursorForSignedPreKey(Account account, int signedPreKeyId) {
 810		SQLiteDatabase db = this.getReadableDatabase();
 811		String[] columns = {SQLiteAxolotlStore.KEY};
 812		String[] selectionArgs = {account.getUuid(), Integer.toString(signedPreKeyId)};
 813		Cursor cursor = db.query(SQLiteAxolotlStore.SIGNED_PREKEY_TABLENAME,
 814				columns,
 815				SQLiteAxolotlStore.ACCOUNT + "=? AND " + SQLiteAxolotlStore.ID + "=?",
 816				selectionArgs,
 817				null, null, null);
 818
 819		return cursor;
 820	}
 821
 822	public SignedPreKeyRecord loadSignedPreKey(Account account, int signedPreKeyId) {
 823		SignedPreKeyRecord record = null;
 824		Cursor cursor = getCursorForSignedPreKey(account, signedPreKeyId);
 825		if (cursor.getCount() != 0) {
 826			cursor.moveToFirst();
 827			try {
 828				record = new SignedPreKeyRecord(Base64.decode(cursor.getString(cursor.getColumnIndex(SQLiteAxolotlStore.KEY)), Base64.DEFAULT));
 829			} catch (IOException e) {
 830				throw new AssertionError(e);
 831			}
 832		}
 833		cursor.close();
 834		return record;
 835	}
 836
 837	public List<SignedPreKeyRecord> loadSignedPreKeys(Account account) {
 838		List<SignedPreKeyRecord> prekeys = new ArrayList<>();
 839		SQLiteDatabase db = this.getReadableDatabase();
 840		String[] columns = {SQLiteAxolotlStore.KEY};
 841		String[] selectionArgs = {account.getUuid()};
 842		Cursor cursor = db.query(SQLiteAxolotlStore.SIGNED_PREKEY_TABLENAME,
 843				columns,
 844				SQLiteAxolotlStore.ACCOUNT + "=?",
 845				selectionArgs,
 846				null, null, null);
 847
 848		while (cursor.moveToNext()) {
 849			try {
 850				prekeys.add(new SignedPreKeyRecord(Base64.decode(cursor.getString(cursor.getColumnIndex(SQLiteAxolotlStore.KEY)), Base64.DEFAULT)));
 851			} catch (IOException ignored) {
 852			}
 853		}
 854		cursor.close();
 855		return prekeys;
 856	}
 857
 858	public boolean containsSignedPreKey(Account account, int signedPreKeyId) {
 859		Cursor cursor = getCursorForPreKey(account, signedPreKeyId);
 860		int count = cursor.getCount();
 861		cursor.close();
 862		return count != 0;
 863	}
 864
 865	public void storeSignedPreKey(Account account, SignedPreKeyRecord record) {
 866		SQLiteDatabase db = this.getWritableDatabase();
 867		ContentValues values = new ContentValues();
 868		values.put(SQLiteAxolotlStore.ID, record.getId());
 869		values.put(SQLiteAxolotlStore.KEY, Base64.encodeToString(record.serialize(), Base64.DEFAULT));
 870		values.put(SQLiteAxolotlStore.ACCOUNT, account.getUuid());
 871		db.insert(SQLiteAxolotlStore.SIGNED_PREKEY_TABLENAME, null, values);
 872	}
 873
 874	public void deleteSignedPreKey(Account account, int signedPreKeyId) {
 875		SQLiteDatabase db = this.getWritableDatabase();
 876		String[] args = {account.getUuid(), Integer.toString(signedPreKeyId)};
 877		db.delete(SQLiteAxolotlStore.SIGNED_PREKEY_TABLENAME,
 878				SQLiteAxolotlStore.ACCOUNT + "=? AND "
 879						+ SQLiteAxolotlStore.ID + "=?",
 880				args);
 881	}
 882
 883	private Cursor getIdentityKeyCursor(Account account, String name, boolean own) {
 884		final SQLiteDatabase db = this.getReadableDatabase();
 885		return getIdentityKeyCursor(db, account, name, own);
 886	}
 887
 888	private Cursor getIdentityKeyCursor(SQLiteDatabase db, Account account, String name, boolean own) {
 889		return getIdentityKeyCursor(db, account, name, own, null);
 890	}
 891
 892	private Cursor getIdentityKeyCursor(Account account, String fingerprint) {
 893		final SQLiteDatabase db = this.getReadableDatabase();
 894		return getIdentityKeyCursor(db, account, fingerprint);
 895	}
 896
 897	private Cursor getIdentityKeyCursor(SQLiteDatabase db, Account account, String fingerprint) {
 898		return getIdentityKeyCursor(db, account, null, null, fingerprint);
 899	}
 900
 901	private Cursor getIdentityKeyCursor(SQLiteDatabase db, Account account, String name, Boolean own, String fingerprint) {
 902		String[] columns = {SQLiteAxolotlStore.TRUSTED,
 903				SQLiteAxolotlStore.KEY};
 904		ArrayList<String> selectionArgs = new ArrayList<>(4);
 905		selectionArgs.add(account.getUuid());
 906		String selectionString = SQLiteAxolotlStore.ACCOUNT + " = ?";
 907		if (name != null) {
 908			selectionArgs.add(name);
 909			selectionString += " AND " + SQLiteAxolotlStore.NAME + " = ?";
 910		}
 911		if (fingerprint != null) {
 912			selectionArgs.add(fingerprint);
 913			selectionString += " AND " + SQLiteAxolotlStore.FINGERPRINT + " = ?";
 914		}
 915		if (own != null) {
 916			selectionArgs.add(own ? "1" : "0");
 917			selectionString += " AND " + SQLiteAxolotlStore.OWN + " = ?";
 918		}
 919		Cursor cursor = db.query(SQLiteAxolotlStore.IDENTITIES_TABLENAME,
 920				columns,
 921				selectionString,
 922				selectionArgs.toArray(new String[selectionArgs.size()]),
 923				null, null, null);
 924
 925		return cursor;
 926	}
 927
 928	public IdentityKeyPair loadOwnIdentityKeyPair(Account account) {
 929		SQLiteDatabase db = getReadableDatabase();
 930		return loadOwnIdentityKeyPair(db, account);
 931	}
 932
 933	private IdentityKeyPair loadOwnIdentityKeyPair(SQLiteDatabase db, Account account) {
 934		String name = account.getJid().toBareJid().toString();
 935		IdentityKeyPair identityKeyPair = null;
 936		Cursor cursor = getIdentityKeyCursor(db, account, name, true);
 937		if (cursor.getCount() != 0) {
 938			cursor.moveToFirst();
 939			try {
 940				identityKeyPair = new IdentityKeyPair(Base64.decode(cursor.getString(cursor.getColumnIndex(SQLiteAxolotlStore.KEY)), Base64.DEFAULT));
 941			} catch (InvalidKeyException e) {
 942				Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Encountered invalid IdentityKey in database for account" + account.getJid().toBareJid() + ", address: " + name);
 943			}
 944		}
 945		cursor.close();
 946
 947		return identityKeyPair;
 948	}
 949
 950	public Set<IdentityKey> loadIdentityKeys(Account account, String name) {
 951		return loadIdentityKeys(account, name, null);
 952	}
 953
 954	public Set<IdentityKey> loadIdentityKeys(Account account, String name, XmppAxolotlSession.Trust trust) {
 955		Set<IdentityKey> identityKeys = new HashSet<>();
 956		Cursor cursor = getIdentityKeyCursor(account, name, false);
 957
 958		while (cursor.moveToNext()) {
 959			if (trust != null &&
 960					cursor.getInt(cursor.getColumnIndex(SQLiteAxolotlStore.TRUSTED))
 961							!= trust.getCode()) {
 962				continue;
 963			}
 964			try {
 965				identityKeys.add(new IdentityKey(Base64.decode(cursor.getString(cursor.getColumnIndex(SQLiteAxolotlStore.KEY)), Base64.DEFAULT), 0));
 966			} catch (InvalidKeyException e) {
 967				Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Encountered invalid IdentityKey in database for account" + account.getJid().toBareJid() + ", address: " + name);
 968			}
 969		}
 970		cursor.close();
 971
 972		return identityKeys;
 973	}
 974
 975	public long numTrustedKeys(Account account, String name) {
 976		SQLiteDatabase db = getReadableDatabase();
 977		String[] args = {
 978				account.getUuid(),
 979				name,
 980				String.valueOf(XmppAxolotlSession.Trust.TRUSTED.getCode()),
 981				String.valueOf(XmppAxolotlSession.Trust.TRUSTED_X509.getCode())
 982		};
 983		return DatabaseUtils.queryNumEntries(db, SQLiteAxolotlStore.IDENTITIES_TABLENAME,
 984				SQLiteAxolotlStore.ACCOUNT + " = ?"
 985						+ " AND " + SQLiteAxolotlStore.NAME + " = ?"
 986						+ " AND (" + SQLiteAxolotlStore.TRUSTED + " = ? OR " + SQLiteAxolotlStore.TRUSTED + " = ?)",
 987				args
 988		);
 989	}
 990
 991	private void storeIdentityKey(Account account, String name, boolean own, String fingerprint, String base64Serialized) {
 992		storeIdentityKey(account, name, own, fingerprint, base64Serialized, XmppAxolotlSession.Trust.UNDECIDED);
 993	}
 994
 995	private void storeIdentityKey(Account account, String name, boolean own, String fingerprint, String base64Serialized, XmppAxolotlSession.Trust trusted) {
 996		SQLiteDatabase db = this.getWritableDatabase();
 997		ContentValues values = new ContentValues();
 998		values.put(SQLiteAxolotlStore.ACCOUNT, account.getUuid());
 999		values.put(SQLiteAxolotlStore.NAME, name);
1000		values.put(SQLiteAxolotlStore.OWN, own ? 1 : 0);
1001		values.put(SQLiteAxolotlStore.FINGERPRINT, fingerprint);
1002		values.put(SQLiteAxolotlStore.KEY, base64Serialized);
1003		values.put(SQLiteAxolotlStore.TRUSTED, trusted.getCode());
1004		db.insert(SQLiteAxolotlStore.IDENTITIES_TABLENAME, null, values);
1005	}
1006
1007	public XmppAxolotlSession.Trust isIdentityKeyTrusted(Account account, String fingerprint) {
1008		Cursor cursor = getIdentityKeyCursor(account, fingerprint);
1009		XmppAxolotlSession.Trust trust = null;
1010		if (cursor.getCount() > 0) {
1011			cursor.moveToFirst();
1012			int trustValue = cursor.getInt(cursor.getColumnIndex(SQLiteAxolotlStore.TRUSTED));
1013			trust = XmppAxolotlSession.Trust.fromCode(trustValue);
1014		}
1015		cursor.close();
1016		return trust;
1017	}
1018
1019	public boolean setIdentityKeyTrust(Account account, String fingerprint, XmppAxolotlSession.Trust trust) {
1020		SQLiteDatabase db = this.getWritableDatabase();
1021		return setIdentityKeyTrust(db, account, fingerprint, trust);
1022	}
1023
1024	private boolean setIdentityKeyTrust(SQLiteDatabase db, Account account, String fingerprint, XmppAxolotlSession.Trust trust) {
1025		String[] selectionArgs = {
1026				account.getUuid(),
1027				fingerprint
1028		};
1029		ContentValues values = new ContentValues();
1030		values.put(SQLiteAxolotlStore.TRUSTED, trust.getCode());
1031		int rows = db.update(SQLiteAxolotlStore.IDENTITIES_TABLENAME, values,
1032				SQLiteAxolotlStore.ACCOUNT + " = ? AND "
1033						+ SQLiteAxolotlStore.FINGERPRINT + " = ? ",
1034				selectionArgs);
1035		return rows == 1;
1036	}
1037
1038	public boolean setIdentityKeyCertificate(Account account, String fingerprint, X509Certificate x509Certificate) {
1039		SQLiteDatabase db = this.getWritableDatabase();
1040		String[] selectionArgs = {
1041				account.getUuid(),
1042				fingerprint
1043		};
1044		try {
1045			ContentValues values = new ContentValues();
1046			values.put(SQLiteAxolotlStore.CERTIFICATE, x509Certificate.getEncoded());
1047			return db.update(SQLiteAxolotlStore.IDENTITIES_TABLENAME, values,
1048					SQLiteAxolotlStore.ACCOUNT + " = ? AND "
1049							+ SQLiteAxolotlStore.FINGERPRINT + " = ? ",
1050					selectionArgs) == 1;
1051		} catch (CertificateEncodingException e) {
1052			Log.d(Config.LOGTAG, "could not encode certificate");
1053			return false;
1054		}
1055	}
1056
1057	public X509Certificate getIdentityKeyCertifcate(Account account, String fingerprint) {
1058		SQLiteDatabase db = this.getReadableDatabase();
1059		String[] selectionArgs = {
1060				account.getUuid(),
1061				fingerprint
1062		};
1063		String[] colums = {SQLiteAxolotlStore.CERTIFICATE};
1064		String selection = SQLiteAxolotlStore.ACCOUNT + " = ? AND " + SQLiteAxolotlStore.FINGERPRINT + " = ? ";
1065		Cursor cursor = db.query(SQLiteAxolotlStore.IDENTITIES_TABLENAME, colums, selection, selectionArgs, null, null, null);
1066		if (cursor.getCount() < 1) {
1067			return null;
1068		} else {
1069			cursor.moveToFirst();
1070			byte[] certificate = cursor.getBlob(cursor.getColumnIndex(SQLiteAxolotlStore.CERTIFICATE));
1071			if (certificate == null || certificate.length == 0) {
1072				return null;
1073			}
1074			try {
1075				CertificateFactory certificateFactory = CertificateFactory.getInstance("X.509");
1076				return (X509Certificate) certificateFactory.generateCertificate(new ByteArrayInputStream(certificate));
1077			} catch (CertificateException e) {
1078				Log.d(Config.LOGTAG,"certificate exception "+e.getMessage());
1079				return null;
1080			}
1081		}
1082	}
1083
1084	public void storeIdentityKey(Account account, String name, IdentityKey identityKey) {
1085		storeIdentityKey(account, name, false, identityKey.getFingerprint().replaceAll("\\s", ""), Base64.encodeToString(identityKey.serialize(), Base64.DEFAULT));
1086	}
1087
1088	public void storeOwnIdentityKeyPair(Account account, IdentityKeyPair identityKeyPair) {
1089		storeIdentityKey(account, account.getJid().toBareJid().toString(), true, identityKeyPair.getPublicKey().getFingerprint().replaceAll("\\s", ""), Base64.encodeToString(identityKeyPair.serialize(), Base64.DEFAULT), XmppAxolotlSession.Trust.TRUSTED);
1090	}
1091
1092	public void recreateAxolotlDb() {
1093		recreateAxolotlDb(getWritableDatabase());
1094	}
1095
1096	public void recreateAxolotlDb(SQLiteDatabase db) {
1097		Log.d(Config.LOGTAG, AxolotlService.LOGPREFIX + " : " + ">>> (RE)CREATING AXOLOTL DATABASE <<<");
1098		db.execSQL("DROP TABLE IF EXISTS " + SQLiteAxolotlStore.SESSION_TABLENAME);
1099		db.execSQL(CREATE_SESSIONS_STATEMENT);
1100		db.execSQL("DROP TABLE IF EXISTS " + SQLiteAxolotlStore.PREKEY_TABLENAME);
1101		db.execSQL(CREATE_PREKEYS_STATEMENT);
1102		db.execSQL("DROP TABLE IF EXISTS " + SQLiteAxolotlStore.SIGNED_PREKEY_TABLENAME);
1103		db.execSQL(CREATE_SIGNED_PREKEYS_STATEMENT);
1104		db.execSQL("DROP TABLE IF EXISTS " + SQLiteAxolotlStore.IDENTITIES_TABLENAME);
1105		db.execSQL(CREATE_IDENTITIES_STATEMENT);
1106	}
1107
1108	public void wipeAxolotlDb(Account account) {
1109		String accountName = account.getUuid();
1110		Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + ">>> WIPING AXOLOTL DATABASE FOR ACCOUNT " + accountName + " <<<");
1111		SQLiteDatabase db = this.getWritableDatabase();
1112		String[] deleteArgs = {
1113				accountName
1114		};
1115		db.delete(SQLiteAxolotlStore.SESSION_TABLENAME,
1116				SQLiteAxolotlStore.ACCOUNT + " = ?",
1117				deleteArgs);
1118		db.delete(SQLiteAxolotlStore.PREKEY_TABLENAME,
1119				SQLiteAxolotlStore.ACCOUNT + " = ?",
1120				deleteArgs);
1121		db.delete(SQLiteAxolotlStore.SIGNED_PREKEY_TABLENAME,
1122				SQLiteAxolotlStore.ACCOUNT + " = ?",
1123				deleteArgs);
1124		db.delete(SQLiteAxolotlStore.IDENTITIES_TABLENAME,
1125				SQLiteAxolotlStore.ACCOUNT + " = ?",
1126				deleteArgs);
1127	}
1128}