MBTilesFileConnector.java

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/*
 * Autopsy Forensic Browser
 *
 * Copyright 2019 Basis Technology Corp.
 * Contact: carrier <at> sleuthkit <dot> org
 *
 * Licensed under the Apache License, Version 2.0 (the "License")
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.sleuthkit.autopsy.geolocation;

import java.nio.file.Path;
import java.nio.file.Paths;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import org.jxmapviewer.OSMTileFactoryInfo;
import org.jxmapviewer.viewer.TileFactoryInfo;
import org.sleuthkit.autopsy.geolocation.datamodel.GeoLocationDataException;

final class MBTilesFileConnector {

    private final static String DB_URL = "jdbc:sqlite:%s";
    private final static String TILE_QUERY = "SELECT tile_data FROM images WHERE tile_id = '%s'";
    private final static String FORMAT_QUERY = "SELECT value FROM metadata WHERE name='format'";
    private final TileFactoryInfo factoryInfo;
    private final String connectionString;

    static boolean isValidMBTileRasterFile(String filePath) throws SQLException {
        Path p = Paths.get(filePath);
        if (!p.toFile().exists()) {
            return false;
        }

        String path = filePath.replaceAll("\\\\", "/");
        String url = String.format(DB_URL, path);

        try (Connection connection = DriverManager.getConnection(url)) {
            try (Statement statement = connection.createStatement();
                    ResultSet resultSet = statement.executeQuery(FORMAT_QUERY)) {
                if (resultSet.next()) {
                    String format = resultSet.getString(1);
                    return format.equals("jpg");
                }
            }
        }
        return false;
    }

    MBTilesFileConnector(String tileFilePath) throws GeoLocationDataException {
       String path = tileFilePath.replaceAll("\\\\", "/");
       connectionString = String.format(DB_URL, path);
       factoryInfo = new MBTilesInfo();  
    }

    TileFactoryInfo getInfo() {
        return factoryInfo;
    }

    byte[] getTileBytes(String tileID) throws GeoLocationDataException {
        String query = String.format(TILE_QUERY, tileID);

        try (Connection connection = DriverManager.getConnection(connectionString)) {
            try (Statement statement = connection.createStatement(); ResultSet resultSet = statement.executeQuery(query)) {
                if (resultSet.next()) {
                    return resultSet.getBytes(1);
                }
            }
        } catch (SQLException ex) {
            throw new GeoLocationDataException(String.format("Failed to get tile %s", tileID), ex);
        }
        return new byte[0];
    }

    private final class MBTilesInfo extends OSMTileFactoryInfo {

        MBTilesInfo() {
            super("MBTilesFile", "");
        }

        @Override
        public String getTileUrl(int x, int y, int zoom) {
            // OSM zoom levels are reversed from how the TileFactory deals with 
            // them.
            int osmZoom = getTotalMapZoom() - zoom;
            return String.format("%d/%d/%d", osmZoom, x, y);
        }
    }
}