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;
  34
  35import eu.siacs.conversations.Config;
  36import eu.siacs.conversations.crypto.axolotl.AxolotlService;
  37import eu.siacs.conversations.crypto.axolotl.SQLiteAxolotlStore;
  38import eu.siacs.conversations.crypto.axolotl.XmppAxolotlSession;
  39import eu.siacs.conversations.entities.Account;
  40import eu.siacs.conversations.entities.Contact;
  41import eu.siacs.conversations.entities.Conversation;
  42import eu.siacs.conversations.entities.Message;
  43import eu.siacs.conversations.entities.Roster;
  44import eu.siacs.conversations.xmpp.jid.InvalidJidException;
  45import eu.siacs.conversations.xmpp.jid.Jid;
  46
  47public class DatabaseBackend extends SQLiteOpenHelper {
  48
  49	private static DatabaseBackend instance = null;
  50
  51	private static final String DATABASE_NAME = "history";
  52	private static final int DATABASE_VERSION = 22;
  53
  54	private static String CREATE_CONTATCS_STATEMENT = "create table "
  55			+ Contact.TABLENAME + "(" + Contact.ACCOUNT + " TEXT, "
  56			+ Contact.SERVERNAME + " TEXT, " + Contact.SYSTEMNAME + " TEXT,"
  57			+ Contact.JID + " TEXT," + Contact.KEYS + " TEXT,"
  58			+ Contact.PHOTOURI + " TEXT," + Contact.OPTIONS + " NUMBER,"
  59			+ Contact.SYSTEMACCOUNT + " NUMBER, " + Contact.AVATAR + " TEXT, "
  60			+ Contact.LAST_PRESENCE + " TEXT, " + Contact.LAST_TIME + " NUMBER, "
  61			+ Contact.GROUPS + " TEXT, FOREIGN KEY(" + Contact.ACCOUNT + ") REFERENCES "
  62			+ Account.TABLENAME + "(" + Account.UUID
  63			+ ") ON DELETE CASCADE, UNIQUE(" + Contact.ACCOUNT + ", "
  64			+ Contact.JID + ") ON CONFLICT REPLACE);";
  65
  66	private static String CREATE_PREKEYS_STATEMENT = "CREATE TABLE "
  67			+ SQLiteAxolotlStore.PREKEY_TABLENAME + "("
  68			+ SQLiteAxolotlStore.ACCOUNT + " TEXT,  "
  69			+ SQLiteAxolotlStore.ID + " INTEGER, "
  70			+ SQLiteAxolotlStore.KEY + " TEXT, FOREIGN KEY("
  71			+ SQLiteAxolotlStore.ACCOUNT
  72			+ ") REFERENCES " + Account.TABLENAME + "(" + Account.UUID + ") ON DELETE CASCADE, "
  73			+ "UNIQUE( " + SQLiteAxolotlStore.ACCOUNT + ", "
  74			+ SQLiteAxolotlStore.ID
  75			+ ") ON CONFLICT REPLACE"
  76			+ ");";
  77
  78	private static String CREATE_SIGNED_PREKEYS_STATEMENT = "CREATE TABLE "
  79			+ SQLiteAxolotlStore.SIGNED_PREKEY_TABLENAME + "("
  80			+ SQLiteAxolotlStore.ACCOUNT + " TEXT,  "
  81			+ SQLiteAxolotlStore.ID + " INTEGER, "
  82			+ SQLiteAxolotlStore.KEY + " TEXT, FOREIGN KEY("
  83			+ SQLiteAxolotlStore.ACCOUNT
  84			+ ") REFERENCES " + Account.TABLENAME + "(" + Account.UUID + ") ON DELETE CASCADE, "
  85			+ "UNIQUE( " + SQLiteAxolotlStore.ACCOUNT + ", "
  86			+ SQLiteAxolotlStore.ID
  87			+ ") ON CONFLICT REPLACE" +
  88			");";
  89
  90	private static String CREATE_SESSIONS_STATEMENT = "CREATE TABLE "
  91			+ SQLiteAxolotlStore.SESSION_TABLENAME + "("
  92			+ SQLiteAxolotlStore.ACCOUNT + " TEXT,  "
  93			+ SQLiteAxolotlStore.NAME + " TEXT, "
  94			+ SQLiteAxolotlStore.DEVICE_ID + " INTEGER, "
  95			+ SQLiteAxolotlStore.KEY + " TEXT, FOREIGN KEY("
  96			+ SQLiteAxolotlStore.ACCOUNT
  97			+ ") REFERENCES " + Account.TABLENAME + "(" + Account.UUID + ") ON DELETE CASCADE, "
  98			+ "UNIQUE( " + SQLiteAxolotlStore.ACCOUNT + ", "
  99			+ SQLiteAxolotlStore.NAME + ", "
 100			+ SQLiteAxolotlStore.DEVICE_ID
 101			+ ") ON CONFLICT REPLACE"
 102			+ ");";
 103
 104	private static String CREATE_IDENTITIES_STATEMENT = "CREATE TABLE "
 105			+ SQLiteAxolotlStore.IDENTITIES_TABLENAME + "("
 106			+ SQLiteAxolotlStore.ACCOUNT + " TEXT,  "
 107			+ SQLiteAxolotlStore.NAME + " TEXT, "
 108			+ SQLiteAxolotlStore.OWN + " INTEGER, "
 109			+ SQLiteAxolotlStore.FINGERPRINT + " TEXT, "
 110			+ SQLiteAxolotlStore.CERTIFICATE + " BLOB, "
 111			+ SQLiteAxolotlStore.TRUSTED + " INTEGER, "
 112			+ SQLiteAxolotlStore.KEY + " TEXT, FOREIGN KEY("
 113			+ SQLiteAxolotlStore.ACCOUNT
 114			+ ") REFERENCES " + Account.TABLENAME + "(" + Account.UUID + ") ON DELETE CASCADE, "
 115			+ "UNIQUE( " + SQLiteAxolotlStore.ACCOUNT + ", "
 116			+ SQLiteAxolotlStore.NAME + ", "
 117			+ SQLiteAxolotlStore.FINGERPRINT
 118			+ ") ON CONFLICT IGNORE"
 119			+ ");";
 120
 121	private DatabaseBackend(Context context) {
 122		super(context, DATABASE_NAME, null, DATABASE_VERSION);
 123	}
 124
 125	@Override
 126	public void onCreate(SQLiteDatabase db) {
 127		db.execSQL("PRAGMA foreign_keys=ON;");
 128		db.execSQL("create table " + Account.TABLENAME + "(" + Account.UUID
 129				+ " TEXT PRIMARY KEY," + Account.USERNAME + " TEXT,"
 130				+ Account.SERVER + " TEXT," + Account.PASSWORD + " TEXT,"
 131				+ Account.DISPLAY_NAME + " TEXT, "
 132				+ Account.ROSTERVERSION + " TEXT," + Account.OPTIONS
 133				+ " NUMBER, " + Account.AVATAR + " TEXT, " + Account.KEYS
 134				+ " TEXT, " + Account.HOSTNAME + " TEXT, " + Account.PORT + " NUMBER DEFAULT 5222)");
 135		db.execSQL("create table " + Conversation.TABLENAME + " ("
 136				+ Conversation.UUID + " TEXT PRIMARY KEY, " + Conversation.NAME
 137				+ " TEXT, " + Conversation.CONTACT + " TEXT, "
 138				+ Conversation.ACCOUNT + " TEXT, " + Conversation.CONTACTJID
 139				+ " TEXT, " + Conversation.CREATED + " NUMBER, "
 140				+ Conversation.STATUS + " NUMBER, " + Conversation.MODE
 141				+ " NUMBER, " + Conversation.ATTRIBUTES + " TEXT, FOREIGN KEY("
 142				+ Conversation.ACCOUNT + ") REFERENCES " + Account.TABLENAME
 143				+ "(" + Account.UUID + ") ON DELETE CASCADE);");
 144		db.execSQL("create table " + Message.TABLENAME + "( " + Message.UUID
 145				+ " TEXT PRIMARY KEY, " + Message.CONVERSATION + " TEXT, "
 146				+ Message.TIME_SENT + " NUMBER, " + Message.COUNTERPART
 147				+ " TEXT, " + Message.TRUE_COUNTERPART + " TEXT,"
 148				+ Message.BODY + " TEXT, " + Message.ENCRYPTION + " NUMBER, "
 149				+ Message.STATUS + " NUMBER," + Message.TYPE + " NUMBER, "
 150				+ Message.RELATIVE_FILE_PATH + " TEXT, "
 151				+ Message.SERVER_MSG_ID + " TEXT, "
 152				+ Message.FINGERPRINT + " TEXT, "
 153				+ Message.CARBON + " INTEGER, "
 154				+ Message.READ + " NUMBER DEFAULT 1, "
 155				+ Message.REMOTE_MSG_ID + " TEXT, FOREIGN KEY("
 156				+ Message.CONVERSATION + ") REFERENCES "
 157				+ Conversation.TABLENAME + "(" + Conversation.UUID
 158				+ ") ON DELETE CASCADE);");
 159
 160		db.execSQL(CREATE_CONTATCS_STATEMENT);
 161		db.execSQL(CREATE_SESSIONS_STATEMENT);
 162		db.execSQL(CREATE_PREKEYS_STATEMENT);
 163		db.execSQL(CREATE_SIGNED_PREKEYS_STATEMENT);
 164		db.execSQL(CREATE_IDENTITIES_STATEMENT);
 165	}
 166
 167	@Override
 168	public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
 169		if (oldVersion < 2 && newVersion >= 2) {
 170			db.execSQL("update " + Account.TABLENAME + " set "
 171					+ Account.OPTIONS + " = " + Account.OPTIONS + " | 8");
 172		}
 173		if (oldVersion < 3 && newVersion >= 3) {
 174			db.execSQL("ALTER TABLE " + Message.TABLENAME + " ADD COLUMN "
 175					+ Message.TYPE + " NUMBER");
 176		}
 177		if (oldVersion < 5 && newVersion >= 5) {
 178			db.execSQL("DROP TABLE " + Contact.TABLENAME);
 179			db.execSQL(CREATE_CONTATCS_STATEMENT);
 180			db.execSQL("UPDATE " + Account.TABLENAME + " SET "
 181					+ Account.ROSTERVERSION + " = NULL");
 182		}
 183		if (oldVersion < 6 && newVersion >= 6) {
 184			db.execSQL("ALTER TABLE " + Message.TABLENAME + " ADD COLUMN "
 185					+ Message.TRUE_COUNTERPART + " TEXT");
 186		}
 187		if (oldVersion < 7 && newVersion >= 7) {
 188			db.execSQL("ALTER TABLE " + Message.TABLENAME + " ADD COLUMN "
 189					+ Message.REMOTE_MSG_ID + " TEXT");
 190			db.execSQL("ALTER TABLE " + Contact.TABLENAME + " ADD COLUMN "
 191					+ Contact.AVATAR + " TEXT");
 192			db.execSQL("ALTER TABLE " + Account.TABLENAME + " ADD COLUMN "
 193					+ Account.AVATAR + " TEXT");
 194		}
 195		if (oldVersion < 8 && newVersion >= 8) {
 196			db.execSQL("ALTER TABLE " + Conversation.TABLENAME + " ADD COLUMN "
 197					+ Conversation.ATTRIBUTES + " TEXT");
 198		}
 199		if (oldVersion < 9 && newVersion >= 9) {
 200			db.execSQL("ALTER TABLE " + Contact.TABLENAME + " ADD COLUMN "
 201					+ Contact.LAST_TIME + " NUMBER");
 202			db.execSQL("ALTER TABLE " + Contact.TABLENAME + " ADD COLUMN "
 203					+ Contact.LAST_PRESENCE + " TEXT");
 204		}
 205		if (oldVersion < 10 && newVersion >= 10) {
 206			db.execSQL("ALTER TABLE " + Message.TABLENAME + " ADD COLUMN "
 207					+ Message.RELATIVE_FILE_PATH + " TEXT");
 208		}
 209		if (oldVersion < 11 && newVersion >= 11) {
 210			db.execSQL("ALTER TABLE " + Contact.TABLENAME + " ADD COLUMN "
 211					+ Contact.GROUPS + " TEXT");
 212			db.execSQL("delete from " + Contact.TABLENAME);
 213			db.execSQL("update " + Account.TABLENAME + " set " + Account.ROSTERVERSION + " = NULL");
 214		}
 215		if (oldVersion < 12 && newVersion >= 12) {
 216			db.execSQL("ALTER TABLE " + Message.TABLENAME + " ADD COLUMN "
 217					+ Message.SERVER_MSG_ID + " TEXT");
 218		}
 219		if (oldVersion < 13 && newVersion >= 13) {
 220			db.execSQL("delete from " + Contact.TABLENAME);
 221			db.execSQL("update " + Account.TABLENAME + " set " + Account.ROSTERVERSION + " = NULL");
 222		}
 223		if (oldVersion < 14 && newVersion >= 14) {
 224			// migrate db to new, canonicalized JID domainpart representation
 225
 226			// Conversation table
 227			Cursor cursor = db.rawQuery("select * from " + Conversation.TABLENAME, new String[0]);
 228			while (cursor.moveToNext()) {
 229				String newJid;
 230				try {
 231					newJid = Jid.fromString(
 232							cursor.getString(cursor.getColumnIndex(Conversation.CONTACTJID))
 233					).toString();
 234				} catch (InvalidJidException ignored) {
 235					Log.e(Config.LOGTAG, "Failed to migrate Conversation CONTACTJID "
 236							+ cursor.getString(cursor.getColumnIndex(Conversation.CONTACTJID))
 237							+ ": " + ignored + ". Skipping...");
 238					continue;
 239				}
 240
 241				String updateArgs[] = {
 242						newJid,
 243						cursor.getString(cursor.getColumnIndex(Conversation.UUID)),
 244				};
 245				db.execSQL("update " + Conversation.TABLENAME
 246						+ " set " + Conversation.CONTACTJID + " = ? "
 247						+ " where " + Conversation.UUID + " = ?", updateArgs);
 248			}
 249			cursor.close();
 250
 251			// Contact table
 252			cursor = db.rawQuery("select * from " + Contact.TABLENAME, new String[0]);
 253			while (cursor.moveToNext()) {
 254				String newJid;
 255				try {
 256					newJid = Jid.fromString(
 257							cursor.getString(cursor.getColumnIndex(Contact.JID))
 258					).toString();
 259				} catch (InvalidJidException ignored) {
 260					Log.e(Config.LOGTAG, "Failed to migrate Contact JID "
 261							+ cursor.getString(cursor.getColumnIndex(Contact.JID))
 262							+ ": " + ignored + ". Skipping...");
 263					continue;
 264				}
 265
 266				String updateArgs[] = {
 267						newJid,
 268						cursor.getString(cursor.getColumnIndex(Contact.ACCOUNT)),
 269						cursor.getString(cursor.getColumnIndex(Contact.JID)),
 270				};
 271				db.execSQL("update " + Contact.TABLENAME
 272						+ " set " + Contact.JID + " = ? "
 273						+ " where " + Contact.ACCOUNT + " = ? "
 274						+ " AND " + Contact.JID + " = ?", updateArgs);
 275			}
 276			cursor.close();
 277
 278			// Account table
 279			cursor = db.rawQuery("select * from " + Account.TABLENAME, new String[0]);
 280			while (cursor.moveToNext()) {
 281				String newServer;
 282				try {
 283					newServer = Jid.fromParts(
 284							cursor.getString(cursor.getColumnIndex(Account.USERNAME)),
 285							cursor.getString(cursor.getColumnIndex(Account.SERVER)),
 286							"mobile"
 287					).getDomainpart();
 288				} catch (InvalidJidException ignored) {
 289					Log.e(Config.LOGTAG, "Failed to migrate Account SERVER "
 290							+ cursor.getString(cursor.getColumnIndex(Account.SERVER))
 291							+ ": " + ignored + ". Skipping...");
 292					continue;
 293				}
 294
 295				String updateArgs[] = {
 296						newServer,
 297						cursor.getString(cursor.getColumnIndex(Account.UUID)),
 298				};
 299				db.execSQL("update " + Account.TABLENAME
 300						+ " set " + Account.SERVER + " = ? "
 301						+ " where " + Account.UUID + " = ?", updateArgs);
 302			}
 303			cursor.close();
 304		}
 305		if (oldVersion < 15 && newVersion >= 15) {
 306			recreateAxolotlDb(db);
 307			db.execSQL("ALTER TABLE " + Message.TABLENAME + " ADD COLUMN "
 308					+ Message.FINGERPRINT + " TEXT");
 309		}
 310		if (oldVersion < 16 && newVersion >= 16) {
 311			db.execSQL("ALTER TABLE " + Message.TABLENAME + " ADD COLUMN "
 312					+ Message.CARBON + " INTEGER");
 313		}
 314		if (oldVersion < 19 && newVersion >= 19) {
 315			db.execSQL("ALTER TABLE " + Account.TABLENAME + " ADD COLUMN " + Account.DISPLAY_NAME + " TEXT");
 316		}
 317		if (oldVersion < 20 && newVersion >= 20) {
 318			db.execSQL("ALTER TABLE " + Account.TABLENAME + " ADD COLUMN " + Account.HOSTNAME + " TEXT");
 319			db.execSQL("ALTER TABLE " + Account.TABLENAME + " ADD COLUMN " + Account.PORT + " NUMBER DEFAULT 5222");
 320		}
 321		/* Any migrations that alter the Account table need to happen BEFORE this migration, as it
 322		 * depends on account de-serialization.
 323		 */
 324		if (oldVersion < 17 && newVersion >= 17) {
 325			List<Account> accounts = getAccounts(db);
 326			for (Account account : accounts) {
 327				String ownDeviceIdString = account.getKey(SQLiteAxolotlStore.JSONKEY_REGISTRATION_ID);
 328				if (ownDeviceIdString == null) {
 329					continue;
 330				}
 331				int ownDeviceId = Integer.valueOf(ownDeviceIdString);
 332				AxolotlAddress ownAddress = new AxolotlAddress(account.getJid().toBareJid().toString(), ownDeviceId);
 333				deleteSession(db, account, ownAddress);
 334				IdentityKeyPair identityKeyPair = loadOwnIdentityKeyPair(db, account);
 335				if (identityKeyPair != null) {
 336					setIdentityKeyTrust(db, account, identityKeyPair.getPublicKey().getFingerprint().replaceAll("\\s", ""), XmppAxolotlSession.Trust.TRUSTED);
 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 < 22 && newVersion >= 22) {
 356			db.execSQL("ALTER TABLE " + SQLiteAxolotlStore.IDENTITIES_TABLENAME + " ADD COLUMN " + SQLiteAxolotlStore.CERTIFICATE);
 357		}
 358	}
 359
 360	public static synchronized DatabaseBackend getInstance(Context context) {
 361		if (instance == null) {
 362			instance = new DatabaseBackend(context);
 363		}
 364		return instance;
 365	}
 366
 367	public void createConversation(Conversation conversation) {
 368		SQLiteDatabase db = this.getWritableDatabase();
 369		db.insert(Conversation.TABLENAME, null, conversation.getContentValues());
 370	}
 371
 372	public void createMessage(Message message) {
 373		SQLiteDatabase db = this.getWritableDatabase();
 374		db.insert(Message.TABLENAME, null, message.getContentValues());
 375	}
 376
 377	public void createAccount(Account account) {
 378		SQLiteDatabase db = this.getWritableDatabase();
 379		db.insert(Account.TABLENAME, null, account.getContentValues());
 380	}
 381
 382	public void createContact(Contact contact) {
 383		SQLiteDatabase db = this.getWritableDatabase();
 384		db.insert(Contact.TABLENAME, null, contact.getContentValues());
 385	}
 386
 387	public int getConversationCount() {
 388		SQLiteDatabase db = this.getReadableDatabase();
 389		Cursor cursor = db.rawQuery("select count(uuid) as count from "
 390				+ Conversation.TABLENAME + " where " + Conversation.STATUS
 391				+ "=" + Conversation.STATUS_AVAILABLE, null);
 392		cursor.moveToFirst();
 393		int count = cursor.getInt(0);
 394		cursor.close();
 395		return count;
 396	}
 397
 398	public CopyOnWriteArrayList<Conversation> getConversations(int status) {
 399		CopyOnWriteArrayList<Conversation> list = new CopyOnWriteArrayList<>();
 400		SQLiteDatabase db = this.getReadableDatabase();
 401		String[] selectionArgs = {Integer.toString(status)};
 402		Cursor cursor = db.rawQuery("select * from " + Conversation.TABLENAME
 403				+ " where " + Conversation.STATUS + " = ? order by "
 404				+ Conversation.CREATED + " desc", selectionArgs);
 405		while (cursor.moveToNext()) {
 406			list.add(Conversation.fromCursor(cursor));
 407		}
 408		cursor.close();
 409		return list;
 410	}
 411
 412	public ArrayList<Message> getMessages(Conversation conversations, int limit) {
 413		return getMessages(conversations, limit, -1);
 414	}
 415
 416	public ArrayList<Message> getMessages(Conversation conversation, int limit,
 417										  long timestamp) {
 418		ArrayList<Message> list = new ArrayList<>();
 419		SQLiteDatabase db = this.getReadableDatabase();
 420		Cursor cursor;
 421		if (timestamp == -1) {
 422			String[] selectionArgs = {conversation.getUuid()};
 423			cursor = db.query(Message.TABLENAME, null, Message.CONVERSATION
 424					+ "=?", selectionArgs, null, null, Message.TIME_SENT
 425					+ " DESC", String.valueOf(limit));
 426		} else {
 427			String[] selectionArgs = {conversation.getUuid(),
 428					Long.toString(timestamp)};
 429			cursor = db.query(Message.TABLENAME, null, Message.CONVERSATION
 430							+ "=? and " + Message.TIME_SENT + "<?", selectionArgs,
 431					null, null, Message.TIME_SENT + " DESC",
 432					String.valueOf(limit));
 433		}
 434		if (cursor.getCount() > 0) {
 435			cursor.moveToLast();
 436			do {
 437				Message message = Message.fromCursor(cursor);
 438				message.setConversation(conversation);
 439				list.add(message);
 440			} while (cursor.moveToPrevious());
 441		}
 442		cursor.close();
 443		return list;
 444	}
 445
 446	public Iterable<Message> getMessagesIterable(final Conversation conversation) {
 447		return new Iterable<Message>() {
 448			@Override
 449			public Iterator<Message> iterator() {
 450				class MessageIterator implements Iterator<Message> {
 451					SQLiteDatabase db = getReadableDatabase();
 452					String[] selectionArgs = {conversation.getUuid()};
 453					Cursor cursor = db.query(Message.TABLENAME, null, Message.CONVERSATION
 454							+ "=?", selectionArgs, null, null, Message.TIME_SENT
 455							+ " ASC", null);
 456
 457					public MessageIterator() {
 458						cursor.moveToFirst();
 459					}
 460
 461					@Override
 462					public boolean hasNext() {
 463						return !cursor.isAfterLast();
 464					}
 465
 466					@Override
 467					public Message next() {
 468						Message message = Message.fromCursor(cursor);
 469						cursor.moveToNext();
 470						return message;
 471					}
 472
 473					@Override
 474					public void remove() {
 475						throw new UnsupportedOperationException();
 476					}
 477				}
 478				return new MessageIterator();
 479			}
 480		};
 481	}
 482
 483	public Conversation findConversation(final Account account, final Jid contactJid) {
 484		SQLiteDatabase db = this.getReadableDatabase();
 485		String[] selectionArgs = {account.getUuid(),
 486				contactJid.toBareJid().toString() + "/%",
 487				contactJid.toBareJid().toString()
 488		};
 489		Cursor cursor = db.query(Conversation.TABLENAME, null,
 490				Conversation.ACCOUNT + "=? AND (" + Conversation.CONTACTJID
 491						+ " like ? OR " + Conversation.CONTACTJID + "=?)", selectionArgs, null, null, null);
 492		if (cursor.getCount() == 0)
 493			return null;
 494		cursor.moveToFirst();
 495		Conversation conversation = Conversation.fromCursor(cursor);
 496		cursor.close();
 497		return conversation;
 498	}
 499
 500	public void updateConversation(final Conversation conversation) {
 501		final SQLiteDatabase db = this.getWritableDatabase();
 502		final String[] args = {conversation.getUuid()};
 503		db.update(Conversation.TABLENAME, conversation.getContentValues(),
 504				Conversation.UUID + "=?", args);
 505	}
 506
 507	public List<Account> getAccounts() {
 508		SQLiteDatabase db = this.getReadableDatabase();
 509		return getAccounts(db);
 510	}
 511
 512	private List<Account> getAccounts(SQLiteDatabase db) {
 513		List<Account> list = new ArrayList<>();
 514		Cursor cursor = db.query(Account.TABLENAME, null, null, null, null,
 515				null, null);
 516		while (cursor.moveToNext()) {
 517			list.add(Account.fromCursor(cursor));
 518		}
 519		cursor.close();
 520		return list;
 521	}
 522
 523	public void updateAccount(Account account) {
 524		SQLiteDatabase db = this.getWritableDatabase();
 525		String[] args = {account.getUuid()};
 526		db.update(Account.TABLENAME, account.getContentValues(), Account.UUID
 527				+ "=?", args);
 528	}
 529
 530	public void deleteAccount(Account account) {
 531		SQLiteDatabase db = this.getWritableDatabase();
 532		String[] args = {account.getUuid()};
 533		db.delete(Account.TABLENAME, Account.UUID + "=?", args);
 534	}
 535
 536	public boolean hasEnabledAccounts() {
 537		SQLiteDatabase db = this.getReadableDatabase();
 538		Cursor cursor = db.rawQuery("select count(" + Account.UUID + ")  from "
 539				+ Account.TABLENAME + " where not options & (1 <<1)", null);
 540		try {
 541			cursor.moveToFirst();
 542			int count = cursor.getInt(0);
 543			cursor.close();
 544			return (count > 0);
 545		} catch (SQLiteCantOpenDatabaseException e) {
 546			return true; // better safe than sorry
 547		} catch (RuntimeException e) {
 548			return true; // better safe than sorry
 549		}
 550	}
 551
 552	@Override
 553	public SQLiteDatabase getWritableDatabase() {
 554		SQLiteDatabase db = super.getWritableDatabase();
 555		db.execSQL("PRAGMA foreign_keys=ON;");
 556		return db;
 557	}
 558
 559	public void updateMessage(Message message) {
 560		SQLiteDatabase db = this.getWritableDatabase();
 561		String[] args = {message.getUuid()};
 562		db.update(Message.TABLENAME, message.getContentValues(), Message.UUID
 563				+ "=?", args);
 564	}
 565
 566	public void readRoster(Roster roster) {
 567		SQLiteDatabase db = this.getReadableDatabase();
 568		Cursor cursor;
 569		String args[] = {roster.getAccount().getUuid()};
 570		cursor = db.query(Contact.TABLENAME, null, Contact.ACCOUNT + "=?", args, null, null, null);
 571		while (cursor.moveToNext()) {
 572			roster.initContact(Contact.fromCursor(cursor));
 573		}
 574		cursor.close();
 575	}
 576
 577	public void writeRoster(final Roster roster) {
 578		final Account account = roster.getAccount();
 579		final SQLiteDatabase db = this.getWritableDatabase();
 580		db.beginTransaction();
 581		for (Contact contact : roster.getContacts()) {
 582			if (contact.getOption(Contact.Options.IN_ROSTER)) {
 583				db.insert(Contact.TABLENAME, null, contact.getContentValues());
 584			} else {
 585				String where = Contact.ACCOUNT + "=? AND " + Contact.JID + "=?";
 586				String[] whereArgs = {account.getUuid(), contact.getJid().toString()};
 587				db.delete(Contact.TABLENAME, where, whereArgs);
 588			}
 589		}
 590		db.setTransactionSuccessful();
 591		db.endTransaction();
 592		account.setRosterVersion(roster.getVersion());
 593		updateAccount(account);
 594	}
 595
 596	public void deleteMessage(Message message) {
 597		SQLiteDatabase db = this.getWritableDatabase();
 598		String[] args = {message.getUuid()};
 599		db.delete(Message.TABLENAME, Message.UUID + "=?", args);
 600	}
 601
 602	public void deleteMessagesInConversation(Conversation conversation) {
 603		SQLiteDatabase db = this.getWritableDatabase();
 604		String[] args = {conversation.getUuid()};
 605		db.delete(Message.TABLENAME, Message.CONVERSATION + "=?", args);
 606	}
 607
 608	public Pair<Long, String> getLastMessageReceived(Account account) {
 609		try {
 610			SQLiteDatabase db = this.getReadableDatabase();
 611			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";
 612			String[] args = {account.getUuid()};
 613			Cursor cursor = db.rawQuery(sql, args);
 614			if (cursor.getCount() == 0) {
 615				return null;
 616			} else {
 617				cursor.moveToFirst();
 618				return new Pair<>(cursor.getLong(0), cursor.getString(1));
 619			}
 620		} catch (Exception e) {
 621			return null;
 622		}
 623	}
 624
 625	public Conversation findConversationByUuid(String conversationUuid) {
 626		SQLiteDatabase db = this.getReadableDatabase();
 627		String[] selectionArgs = {conversationUuid};
 628		Cursor cursor = db.query(Conversation.TABLENAME, null,
 629				Conversation.UUID + "=?", selectionArgs, null, null, null);
 630		if (cursor.getCount() == 0) {
 631			return null;
 632		}
 633		cursor.moveToFirst();
 634		Conversation conversation = Conversation.fromCursor(cursor);
 635		cursor.close();
 636		return conversation;
 637	}
 638
 639	public Message findMessageByUuid(String messageUuid) {
 640		SQLiteDatabase db = this.getReadableDatabase();
 641		String[] selectionArgs = {messageUuid};
 642		Cursor cursor = db.query(Message.TABLENAME, null, Message.UUID + "=?",
 643				selectionArgs, null, null, null);
 644		if (cursor.getCount() == 0) {
 645			return null;
 646		}
 647		cursor.moveToFirst();
 648		Message message = Message.fromCursor(cursor);
 649		cursor.close();
 650		return message;
 651	}
 652
 653	public Account findAccountByUuid(String accountUuid) {
 654		SQLiteDatabase db = this.getReadableDatabase();
 655		String[] selectionArgs = {accountUuid};
 656		Cursor cursor = db.query(Account.TABLENAME, null, Account.UUID + "=?",
 657				selectionArgs, null, null, null);
 658		if (cursor.getCount() == 0) {
 659			return null;
 660		}
 661		cursor.moveToFirst();
 662		Account account = Account.fromCursor(cursor);
 663		cursor.close();
 664		return account;
 665	}
 666
 667	public List<Message> getImageMessages(Conversation conversation) {
 668		ArrayList<Message> list = new ArrayList<>();
 669		SQLiteDatabase db = this.getReadableDatabase();
 670		Cursor cursor;
 671		String[] selectionArgs = {conversation.getUuid(), String.valueOf(Message.TYPE_IMAGE)};
 672		cursor = db.query(Message.TABLENAME, null, Message.CONVERSATION
 673				+ "=? AND " + Message.TYPE + "=?", selectionArgs, null, null, null);
 674		if (cursor.getCount() > 0) {
 675			cursor.moveToLast();
 676			do {
 677				Message message = Message.fromCursor(cursor);
 678				message.setConversation(conversation);
 679				list.add(message);
 680			} while (cursor.moveToPrevious());
 681		}
 682		cursor.close();
 683		return list;
 684	}
 685
 686	private Cursor getCursorForSession(Account account, AxolotlAddress contact) {
 687		final SQLiteDatabase db = this.getReadableDatabase();
 688		String[] columns = null;
 689		String[] selectionArgs = {account.getUuid(),
 690				contact.getName(),
 691				Integer.toString(contact.getDeviceId())};
 692		Cursor cursor = db.query(SQLiteAxolotlStore.SESSION_TABLENAME,
 693				columns,
 694				SQLiteAxolotlStore.ACCOUNT + " = ? AND "
 695						+ SQLiteAxolotlStore.NAME + " = ? AND "
 696						+ SQLiteAxolotlStore.DEVICE_ID + " = ? ",
 697				selectionArgs,
 698				null, null, null);
 699
 700		return cursor;
 701	}
 702
 703	public SessionRecord loadSession(Account account, AxolotlAddress contact) {
 704		SessionRecord session = null;
 705		Cursor cursor = getCursorForSession(account, contact);
 706		if (cursor.getCount() != 0) {
 707			cursor.moveToFirst();
 708			try {
 709				session = new SessionRecord(Base64.decode(cursor.getString(cursor.getColumnIndex(SQLiteAxolotlStore.KEY)), Base64.DEFAULT));
 710			} catch (IOException e) {
 711				cursor.close();
 712				throw new AssertionError(e);
 713			}
 714		}
 715		cursor.close();
 716		return session;
 717	}
 718
 719	public List<Integer> getSubDeviceSessions(Account account, AxolotlAddress contact) {
 720		final SQLiteDatabase db = this.getReadableDatabase();
 721		return getSubDeviceSessions(db, account, contact);
 722	}
 723
 724	private List<Integer> getSubDeviceSessions(SQLiteDatabase db, Account account, AxolotlAddress contact) {
 725		List<Integer> devices = new ArrayList<>();
 726		String[] columns = {SQLiteAxolotlStore.DEVICE_ID};
 727		String[] selectionArgs = {account.getUuid(),
 728				contact.getName()};
 729		Cursor cursor = db.query(SQLiteAxolotlStore.SESSION_TABLENAME,
 730				columns,
 731				SQLiteAxolotlStore.ACCOUNT + " = ? AND "
 732						+ SQLiteAxolotlStore.NAME + " = ?",
 733				selectionArgs,
 734				null, null, null);
 735
 736		while (cursor.moveToNext()) {
 737			devices.add(cursor.getInt(
 738					cursor.getColumnIndex(SQLiteAxolotlStore.DEVICE_ID)));
 739		}
 740
 741		cursor.close();
 742		return devices;
 743	}
 744
 745	public boolean containsSession(Account account, AxolotlAddress contact) {
 746		Cursor cursor = getCursorForSession(account, contact);
 747		int count = cursor.getCount();
 748		cursor.close();
 749		return count != 0;
 750	}
 751
 752	public void storeSession(Account account, AxolotlAddress contact, SessionRecord session) {
 753		SQLiteDatabase db = this.getWritableDatabase();
 754		ContentValues values = new ContentValues();
 755		values.put(SQLiteAxolotlStore.NAME, contact.getName());
 756		values.put(SQLiteAxolotlStore.DEVICE_ID, contact.getDeviceId());
 757		values.put(SQLiteAxolotlStore.KEY, Base64.encodeToString(session.serialize(), Base64.DEFAULT));
 758		values.put(SQLiteAxolotlStore.ACCOUNT, account.getUuid());
 759		db.insert(SQLiteAxolotlStore.SESSION_TABLENAME, null, values);
 760	}
 761
 762	public void deleteSession(Account account, AxolotlAddress contact) {
 763		SQLiteDatabase db = this.getWritableDatabase();
 764		deleteSession(db, account, contact);
 765	}
 766
 767	private void deleteSession(SQLiteDatabase db, Account account, AxolotlAddress contact) {
 768		String[] args = {account.getUuid(),
 769				contact.getName(),
 770				Integer.toString(contact.getDeviceId())};
 771		db.delete(SQLiteAxolotlStore.SESSION_TABLENAME,
 772				SQLiteAxolotlStore.ACCOUNT + " = ? AND "
 773						+ SQLiteAxolotlStore.NAME + " = ? AND "
 774						+ SQLiteAxolotlStore.DEVICE_ID + " = ? ",
 775				args);
 776	}
 777
 778	public void deleteAllSessions(Account account, AxolotlAddress contact) {
 779		SQLiteDatabase db = this.getWritableDatabase();
 780		String[] args = {account.getUuid(), contact.getName()};
 781		db.delete(SQLiteAxolotlStore.SESSION_TABLENAME,
 782				SQLiteAxolotlStore.ACCOUNT + "=? AND "
 783						+ SQLiteAxolotlStore.NAME + " = ?",
 784				args);
 785	}
 786
 787	private Cursor getCursorForPreKey(Account account, int preKeyId) {
 788		SQLiteDatabase db = this.getReadableDatabase();
 789		String[] columns = {SQLiteAxolotlStore.KEY};
 790		String[] selectionArgs = {account.getUuid(), Integer.toString(preKeyId)};
 791		Cursor cursor = db.query(SQLiteAxolotlStore.PREKEY_TABLENAME,
 792				columns,
 793				SQLiteAxolotlStore.ACCOUNT + "=? AND "
 794						+ SQLiteAxolotlStore.ID + "=?",
 795				selectionArgs,
 796				null, null, null);
 797
 798		return cursor;
 799	}
 800
 801	public PreKeyRecord loadPreKey(Account account, int preKeyId) {
 802		PreKeyRecord record = null;
 803		Cursor cursor = getCursorForPreKey(account, preKeyId);
 804		if (cursor.getCount() != 0) {
 805			cursor.moveToFirst();
 806			try {
 807				record = new PreKeyRecord(Base64.decode(cursor.getString(cursor.getColumnIndex(SQLiteAxolotlStore.KEY)), Base64.DEFAULT));
 808			} catch (IOException e) {
 809				throw new AssertionError(e);
 810			}
 811		}
 812		cursor.close();
 813		return record;
 814	}
 815
 816	public boolean containsPreKey(Account account, int preKeyId) {
 817		Cursor cursor = getCursorForPreKey(account, preKeyId);
 818		int count = cursor.getCount();
 819		cursor.close();
 820		return count != 0;
 821	}
 822
 823	public void storePreKey(Account account, PreKeyRecord record) {
 824		SQLiteDatabase db = this.getWritableDatabase();
 825		ContentValues values = new ContentValues();
 826		values.put(SQLiteAxolotlStore.ID, record.getId());
 827		values.put(SQLiteAxolotlStore.KEY, Base64.encodeToString(record.serialize(), Base64.DEFAULT));
 828		values.put(SQLiteAxolotlStore.ACCOUNT, account.getUuid());
 829		db.insert(SQLiteAxolotlStore.PREKEY_TABLENAME, null, values);
 830	}
 831
 832	public void deletePreKey(Account account, int preKeyId) {
 833		SQLiteDatabase db = this.getWritableDatabase();
 834		String[] args = {account.getUuid(), Integer.toString(preKeyId)};
 835		db.delete(SQLiteAxolotlStore.PREKEY_TABLENAME,
 836				SQLiteAxolotlStore.ACCOUNT + "=? AND "
 837						+ SQLiteAxolotlStore.ID + "=?",
 838				args);
 839	}
 840
 841	private Cursor getCursorForSignedPreKey(Account account, int signedPreKeyId) {
 842		SQLiteDatabase db = this.getReadableDatabase();
 843		String[] columns = {SQLiteAxolotlStore.KEY};
 844		String[] selectionArgs = {account.getUuid(), Integer.toString(signedPreKeyId)};
 845		Cursor cursor = db.query(SQLiteAxolotlStore.SIGNED_PREKEY_TABLENAME,
 846				columns,
 847				SQLiteAxolotlStore.ACCOUNT + "=? AND " + SQLiteAxolotlStore.ID + "=?",
 848				selectionArgs,
 849				null, null, null);
 850
 851		return cursor;
 852	}
 853
 854	public SignedPreKeyRecord loadSignedPreKey(Account account, int signedPreKeyId) {
 855		SignedPreKeyRecord record = null;
 856		Cursor cursor = getCursorForSignedPreKey(account, signedPreKeyId);
 857		if (cursor.getCount() != 0) {
 858			cursor.moveToFirst();
 859			try {
 860				record = new SignedPreKeyRecord(Base64.decode(cursor.getString(cursor.getColumnIndex(SQLiteAxolotlStore.KEY)), Base64.DEFAULT));
 861			} catch (IOException e) {
 862				throw new AssertionError(e);
 863			}
 864		}
 865		cursor.close();
 866		return record;
 867	}
 868
 869	public List<SignedPreKeyRecord> loadSignedPreKeys(Account account) {
 870		List<SignedPreKeyRecord> prekeys = new ArrayList<>();
 871		SQLiteDatabase db = this.getReadableDatabase();
 872		String[] columns = {SQLiteAxolotlStore.KEY};
 873		String[] selectionArgs = {account.getUuid()};
 874		Cursor cursor = db.query(SQLiteAxolotlStore.SIGNED_PREKEY_TABLENAME,
 875				columns,
 876				SQLiteAxolotlStore.ACCOUNT + "=?",
 877				selectionArgs,
 878				null, null, null);
 879
 880		while (cursor.moveToNext()) {
 881			try {
 882				prekeys.add(new SignedPreKeyRecord(Base64.decode(cursor.getString(cursor.getColumnIndex(SQLiteAxolotlStore.KEY)), Base64.DEFAULT)));
 883			} catch (IOException ignored) {
 884			}
 885		}
 886		cursor.close();
 887		return prekeys;
 888	}
 889
 890	public boolean containsSignedPreKey(Account account, int signedPreKeyId) {
 891		Cursor cursor = getCursorForPreKey(account, signedPreKeyId);
 892		int count = cursor.getCount();
 893		cursor.close();
 894		return count != 0;
 895	}
 896
 897	public void storeSignedPreKey(Account account, SignedPreKeyRecord record) {
 898		SQLiteDatabase db = this.getWritableDatabase();
 899		ContentValues values = new ContentValues();
 900		values.put(SQLiteAxolotlStore.ID, record.getId());
 901		values.put(SQLiteAxolotlStore.KEY, Base64.encodeToString(record.serialize(), Base64.DEFAULT));
 902		values.put(SQLiteAxolotlStore.ACCOUNT, account.getUuid());
 903		db.insert(SQLiteAxolotlStore.SIGNED_PREKEY_TABLENAME, null, values);
 904	}
 905
 906	public void deleteSignedPreKey(Account account, int signedPreKeyId) {
 907		SQLiteDatabase db = this.getWritableDatabase();
 908		String[] args = {account.getUuid(), Integer.toString(signedPreKeyId)};
 909		db.delete(SQLiteAxolotlStore.SIGNED_PREKEY_TABLENAME,
 910				SQLiteAxolotlStore.ACCOUNT + "=? AND "
 911						+ SQLiteAxolotlStore.ID + "=?",
 912				args);
 913	}
 914
 915	private Cursor getIdentityKeyCursor(Account account, String name, boolean own) {
 916		final SQLiteDatabase db = this.getReadableDatabase();
 917		return getIdentityKeyCursor(db, account, name, own);
 918	}
 919
 920	private Cursor getIdentityKeyCursor(SQLiteDatabase db, Account account, String name, boolean own) {
 921		return getIdentityKeyCursor(db, account, name, own, null);
 922	}
 923
 924	private Cursor getIdentityKeyCursor(Account account, String fingerprint) {
 925		final SQLiteDatabase db = this.getReadableDatabase();
 926		return getIdentityKeyCursor(db, account, fingerprint);
 927	}
 928
 929	private Cursor getIdentityKeyCursor(SQLiteDatabase db, Account account, String fingerprint) {
 930		return getIdentityKeyCursor(db, account, null, null, fingerprint);
 931	}
 932
 933	private Cursor getIdentityKeyCursor(SQLiteDatabase db, Account account, String name, Boolean own, String fingerprint) {
 934		String[] columns = {SQLiteAxolotlStore.TRUSTED,
 935				SQLiteAxolotlStore.KEY};
 936		ArrayList<String> selectionArgs = new ArrayList<>(4);
 937		selectionArgs.add(account.getUuid());
 938		String selectionString = SQLiteAxolotlStore.ACCOUNT + " = ?";
 939		if (name != null) {
 940			selectionArgs.add(name);
 941			selectionString += " AND " + SQLiteAxolotlStore.NAME + " = ?";
 942		}
 943		if (fingerprint != null) {
 944			selectionArgs.add(fingerprint);
 945			selectionString += " AND " + SQLiteAxolotlStore.FINGERPRINT + " = ?";
 946		}
 947		if (own != null) {
 948			selectionArgs.add(own ? "1" : "0");
 949			selectionString += " AND " + SQLiteAxolotlStore.OWN + " = ?";
 950		}
 951		Cursor cursor = db.query(SQLiteAxolotlStore.IDENTITIES_TABLENAME,
 952				columns,
 953				selectionString,
 954				selectionArgs.toArray(new String[selectionArgs.size()]),
 955				null, null, null);
 956
 957		return cursor;
 958	}
 959
 960	public IdentityKeyPair loadOwnIdentityKeyPair(Account account) {
 961		SQLiteDatabase db = getReadableDatabase();
 962		return loadOwnIdentityKeyPair(db, account);
 963	}
 964
 965	private IdentityKeyPair loadOwnIdentityKeyPair(SQLiteDatabase db, Account account) {
 966		String name = account.getJid().toBareJid().toString();
 967		IdentityKeyPair identityKeyPair = null;
 968		Cursor cursor = getIdentityKeyCursor(db, account, name, true);
 969		if (cursor.getCount() != 0) {
 970			cursor.moveToFirst();
 971			try {
 972				identityKeyPair = new IdentityKeyPair(Base64.decode(cursor.getString(cursor.getColumnIndex(SQLiteAxolotlStore.KEY)), Base64.DEFAULT));
 973			} catch (InvalidKeyException e) {
 974				Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Encountered invalid IdentityKey in database for account" + account.getJid().toBareJid() + ", address: " + name);
 975			}
 976		}
 977		cursor.close();
 978
 979		return identityKeyPair;
 980	}
 981
 982	public Set<IdentityKey> loadIdentityKeys(Account account, String name) {
 983		return loadIdentityKeys(account, name, null);
 984	}
 985
 986	public Set<IdentityKey> loadIdentityKeys(Account account, String name, XmppAxolotlSession.Trust trust) {
 987		Set<IdentityKey> identityKeys = new HashSet<>();
 988		Cursor cursor = getIdentityKeyCursor(account, name, false);
 989
 990		while (cursor.moveToNext()) {
 991			if (trust != null &&
 992					cursor.getInt(cursor.getColumnIndex(SQLiteAxolotlStore.TRUSTED))
 993							!= trust.getCode()) {
 994				continue;
 995			}
 996			try {
 997				identityKeys.add(new IdentityKey(Base64.decode(cursor.getString(cursor.getColumnIndex(SQLiteAxolotlStore.KEY)), Base64.DEFAULT), 0));
 998			} catch (InvalidKeyException e) {
 999				Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Encountered invalid IdentityKey in database for account" + account.getJid().toBareJid() + ", address: " + name);
1000			}
1001		}
1002		cursor.close();
1003
1004		return identityKeys;
1005	}
1006
1007	public long numTrustedKeys(Account account, String name) {
1008		SQLiteDatabase db = getReadableDatabase();
1009		String[] args = {
1010				account.getUuid(),
1011				name,
1012				String.valueOf(XmppAxolotlSession.Trust.TRUSTED.getCode()),
1013				String.valueOf(XmppAxolotlSession.Trust.TRUSTED_X509.getCode())
1014		};
1015		return DatabaseUtils.queryNumEntries(db, SQLiteAxolotlStore.IDENTITIES_TABLENAME,
1016				SQLiteAxolotlStore.ACCOUNT + " = ?"
1017						+ " AND " + SQLiteAxolotlStore.NAME + " = ?"
1018						+ " AND (" + SQLiteAxolotlStore.TRUSTED + " = ? OR " + SQLiteAxolotlStore.TRUSTED + " = ?)",
1019				args
1020		);
1021	}
1022
1023	private void storeIdentityKey(Account account, String name, boolean own, String fingerprint, String base64Serialized) {
1024		storeIdentityKey(account, name, own, fingerprint, base64Serialized, XmppAxolotlSession.Trust.UNDECIDED);
1025	}
1026
1027	private void storeIdentityKey(Account account, String name, boolean own, String fingerprint, String base64Serialized, XmppAxolotlSession.Trust trusted) {
1028		SQLiteDatabase db = this.getWritableDatabase();
1029		ContentValues values = new ContentValues();
1030		values.put(SQLiteAxolotlStore.ACCOUNT, account.getUuid());
1031		values.put(SQLiteAxolotlStore.NAME, name);
1032		values.put(SQLiteAxolotlStore.OWN, own ? 1 : 0);
1033		values.put(SQLiteAxolotlStore.FINGERPRINT, fingerprint);
1034		values.put(SQLiteAxolotlStore.KEY, base64Serialized);
1035		values.put(SQLiteAxolotlStore.TRUSTED, trusted.getCode());
1036		db.insert(SQLiteAxolotlStore.IDENTITIES_TABLENAME, null, values);
1037	}
1038
1039	public XmppAxolotlSession.Trust isIdentityKeyTrusted(Account account, String fingerprint) {
1040		Cursor cursor = getIdentityKeyCursor(account, fingerprint);
1041		XmppAxolotlSession.Trust trust = null;
1042		if (cursor.getCount() > 0) {
1043			cursor.moveToFirst();
1044			int trustValue = cursor.getInt(cursor.getColumnIndex(SQLiteAxolotlStore.TRUSTED));
1045			trust = XmppAxolotlSession.Trust.fromCode(trustValue);
1046		}
1047		cursor.close();
1048		return trust;
1049	}
1050
1051	public boolean setIdentityKeyTrust(Account account, String fingerprint, XmppAxolotlSession.Trust trust) {
1052		SQLiteDatabase db = this.getWritableDatabase();
1053		return setIdentityKeyTrust(db, account, fingerprint, trust);
1054	}
1055
1056	private boolean setIdentityKeyTrust(SQLiteDatabase db, Account account, String fingerprint, XmppAxolotlSession.Trust trust) {
1057		String[] selectionArgs = {
1058				account.getUuid(),
1059				fingerprint
1060		};
1061		ContentValues values = new ContentValues();
1062		values.put(SQLiteAxolotlStore.TRUSTED, trust.getCode());
1063		int rows = db.update(SQLiteAxolotlStore.IDENTITIES_TABLENAME, values,
1064				SQLiteAxolotlStore.ACCOUNT + " = ? AND "
1065						+ SQLiteAxolotlStore.FINGERPRINT + " = ? ",
1066				selectionArgs);
1067		return rows == 1;
1068	}
1069
1070	public boolean setIdentityKeyCertificate(Account account, String fingerprint, X509Certificate x509Certificate) {
1071		SQLiteDatabase db = this.getWritableDatabase();
1072		String[] selectionArgs = {
1073				account.getUuid(),
1074				fingerprint
1075		};
1076		try {
1077			ContentValues values = new ContentValues();
1078			values.put(SQLiteAxolotlStore.CERTIFICATE, x509Certificate.getEncoded());
1079			return db.update(SQLiteAxolotlStore.IDENTITIES_TABLENAME, values,
1080					SQLiteAxolotlStore.ACCOUNT + " = ? AND "
1081							+ SQLiteAxolotlStore.FINGERPRINT + " = ? ",
1082					selectionArgs) == 1;
1083		} catch (CertificateEncodingException e) {
1084			Log.d(Config.LOGTAG, "could not encode certificate");
1085			return false;
1086		}
1087	}
1088
1089	public X509Certificate getIdentityKeyCertifcate(Account account, String fingerprint) {
1090		SQLiteDatabase db = this.getReadableDatabase();
1091		String[] selectionArgs = {
1092				account.getUuid(),
1093				fingerprint
1094		};
1095		String[] colums = {SQLiteAxolotlStore.CERTIFICATE};
1096		String selection = SQLiteAxolotlStore.ACCOUNT + " = ? AND " + SQLiteAxolotlStore.FINGERPRINT + " = ? ";
1097		Cursor cursor = db.query(SQLiteAxolotlStore.IDENTITIES_TABLENAME, colums, selection, selectionArgs, null, null, null);
1098		if (cursor.getCount() < 1) {
1099			return null;
1100		} else {
1101			cursor.moveToFirst();
1102			byte[] certificate = cursor.getBlob(cursor.getColumnIndex(SQLiteAxolotlStore.CERTIFICATE));
1103			if (certificate == null || certificate.length == 0) {
1104				return null;
1105			}
1106			try {
1107				CertificateFactory certificateFactory = CertificateFactory.getInstance("X.509");
1108				return (X509Certificate) certificateFactory.generateCertificate(new ByteArrayInputStream(certificate));
1109			} catch (CertificateException e) {
1110				Log.d(Config.LOGTAG,"certificate exception "+e.getMessage());
1111				return null;
1112			}
1113		}
1114	}
1115
1116	public void storeIdentityKey(Account account, String name, IdentityKey identityKey) {
1117		storeIdentityKey(account, name, false, identityKey.getFingerprint().replaceAll("\\s", ""), Base64.encodeToString(identityKey.serialize(), Base64.DEFAULT));
1118	}
1119
1120	public void storeOwnIdentityKeyPair(Account account, IdentityKeyPair identityKeyPair) {
1121		storeIdentityKey(account, account.getJid().toBareJid().toString(), true, identityKeyPair.getPublicKey().getFingerprint().replaceAll("\\s", ""), Base64.encodeToString(identityKeyPair.serialize(), Base64.DEFAULT), XmppAxolotlSession.Trust.TRUSTED);
1122	}
1123
1124	public void recreateAxolotlDb() {
1125		recreateAxolotlDb(getWritableDatabase());
1126	}
1127
1128	public void recreateAxolotlDb(SQLiteDatabase db) {
1129		Log.d(Config.LOGTAG, AxolotlService.LOGPREFIX + " : " + ">>> (RE)CREATING AXOLOTL DATABASE <<<");
1130		db.execSQL("DROP TABLE IF EXISTS " + SQLiteAxolotlStore.SESSION_TABLENAME);
1131		db.execSQL(CREATE_SESSIONS_STATEMENT);
1132		db.execSQL("DROP TABLE IF EXISTS " + SQLiteAxolotlStore.PREKEY_TABLENAME);
1133		db.execSQL(CREATE_PREKEYS_STATEMENT);
1134		db.execSQL("DROP TABLE IF EXISTS " + SQLiteAxolotlStore.SIGNED_PREKEY_TABLENAME);
1135		db.execSQL(CREATE_SIGNED_PREKEYS_STATEMENT);
1136		db.execSQL("DROP TABLE IF EXISTS " + SQLiteAxolotlStore.IDENTITIES_TABLENAME);
1137		db.execSQL(CREATE_IDENTITIES_STATEMENT);
1138	}
1139
1140	public void wipeAxolotlDb(Account account) {
1141		String accountName = account.getUuid();
1142		Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + ">>> WIPING AXOLOTL DATABASE FOR ACCOUNT " + accountName + " <<<");
1143		SQLiteDatabase db = this.getWritableDatabase();
1144		String[] deleteArgs = {
1145				accountName
1146		};
1147		db.delete(SQLiteAxolotlStore.SESSION_TABLENAME,
1148				SQLiteAxolotlStore.ACCOUNT + " = ?",
1149				deleteArgs);
1150		db.delete(SQLiteAxolotlStore.PREKEY_TABLENAME,
1151				SQLiteAxolotlStore.ACCOUNT + " = ?",
1152				deleteArgs);
1153		db.delete(SQLiteAxolotlStore.SIGNED_PREKEY_TABLENAME,
1154				SQLiteAxolotlStore.ACCOUNT + " = ?",
1155				deleteArgs);
1156		db.delete(SQLiteAxolotlStore.IDENTITIES_TABLENAME,
1157				SQLiteAxolotlStore.ACCOUNT + " = ?",
1158				deleteArgs);
1159	}
1160}