203 lines
9.0 KiB
Java
203 lines
9.0 KiB
Java
/*
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* This file is part of BlueMap, licensed under the MIT License (MIT).
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*
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* Copyright (c) Blue (Lukas Rieger) <https://bluecolored.de>
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* Copyright (c) contributors
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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package de.bluecolored.bluemap.common.web;
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import com.flowpowered.math.vector.Vector2i;
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import de.bluecolored.bluemap.api.ContentTypeRegistry;
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import de.bluecolored.bluemap.api.debug.DebugDump;
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import de.bluecolored.bluemap.common.web.http.*;
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import de.bluecolored.bluemap.core.logger.Logger;
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import de.bluecolored.bluemap.core.map.BmMap;
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import de.bluecolored.bluemap.core.storage.CompressedInputStream;
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import de.bluecolored.bluemap.core.storage.Compression;
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import de.bluecolored.bluemap.core.storage.Storage;
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import de.bluecolored.bluemap.core.storage.TileInfo;
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import org.apache.commons.io.IOUtils;
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import org.apache.commons.lang3.time.DateFormatUtils;
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import java.io.*;
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import java.util.*;
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import java.util.regex.Matcher;
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import java.util.regex.Pattern;
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@DebugDump
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public class MapStorageRequestHandler implements HttpRequestHandler {
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private static final Pattern TILE_PATTERN = Pattern.compile("tiles/([\\d/]+)/x(-?[\\d/]+)z(-?[\\d/]+).*");
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private final String mapId;
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private final Storage mapStorage;
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public MapStorageRequestHandler(BmMap map) {
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this.mapId = map.getId();
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this.mapStorage = map.getStorage();
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}
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public MapStorageRequestHandler(String mapId, Storage mapStorage) {
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this.mapId = mapId;
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this.mapStorage = mapStorage;
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}
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@Override
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public HttpResponse handle(HttpRequest request) {
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String path = request.getPath();
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//normalize path
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if (path.startsWith("/")) path = path.substring(1);
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if (path.endsWith("/")) path = path.substring(0, path.length() - 1);
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try {
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// provide map-tiles
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Matcher tileMatcher = TILE_PATTERN.matcher(path);
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if (tileMatcher.matches()) {
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int lod = Integer.parseInt(tileMatcher.group(1));
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int x = Integer.parseInt(tileMatcher.group(2).replace("/", ""));
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int z = Integer.parseInt(tileMatcher.group(3).replace("/", ""));
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Optional<TileInfo> optTileInfo = mapStorage.readMapTileInfo(mapId, lod, new Vector2i(x, z));
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if (optTileInfo.isPresent()) {
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TileInfo tileInfo = optTileInfo.get();
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// check e-tag
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String eTag = calculateETag(path, tileInfo);
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HttpHeader etagHeader = request.getHeader("If-None-Match");
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if (etagHeader != null){
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if(etagHeader.getValue().equals(eTag)) {
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return new HttpResponse(HttpStatusCode.NOT_MODIFIED);
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}
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}
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// check modified-since
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long lastModified = tileInfo.getLastModified();
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HttpHeader modHeader = request.getHeader("If-Modified-Since");
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if (modHeader != null){
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try {
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long since = stringToTimestamp(modHeader.getValue());
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if (since + 1000 >= lastModified){
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return new HttpResponse(HttpStatusCode.NOT_MODIFIED);
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}
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} catch (IllegalArgumentException ignored){}
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}
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CompressedInputStream compressedIn = tileInfo.readMapTile();
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HttpResponse response = new HttpResponse(HttpStatusCode.OK);
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response.addHeader("ETag", eTag);
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if (lastModified > 0)
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response.addHeader("Last-Modified", timestampToString(lastModified));
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if (lod == 0) response.addHeader("Content-Type", "application/json");
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else response.addHeader("Content-Type", "image/png");
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writeToResponse(compressedIn, response, request);
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return response;
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}
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}
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// provide meta-data
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Optional<InputStream> optIn = mapStorage.readMeta(mapId, path);
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if (optIn.isPresent()) {
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CompressedInputStream compressedIn = new CompressedInputStream(optIn.get(), Compression.NONE);
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HttpResponse response = new HttpResponse(HttpStatusCode.OK);
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response.addHeader("Content-Type", ContentTypeRegistry.fromFileName(path));
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writeToResponse(compressedIn, response, request);
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return response;
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}
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} catch (NumberFormatException | NoSuchElementException ignore){
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} catch (IOException ex) {
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Logger.global.logError("Failed to read map-tile for web-request.", ex);
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return new HttpResponse(HttpStatusCode.INTERNAL_SERVER_ERROR);
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}
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return new HttpResponse(HttpStatusCode.NO_CONTENT);
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}
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private String calculateETag(String path, TileInfo tileInfo) {
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return Long.toHexString(tileInfo.getSize()) + Integer.toHexString(path.hashCode()) + Long.toHexString(tileInfo.getLastModified());
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}
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private void writeToResponse(CompressedInputStream data, HttpResponse response, HttpRequest request) throws IOException {
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Compression compression = data.getCompression();
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if (
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compression != Compression.NONE &&
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request.hasHeaderValue("Accept-Encoding", compression.getTypeId())
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) {
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response.addHeader("Content-Encoding", compression.getTypeId());
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response.setData(data);
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} else if (
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compression != Compression.GZIP &&
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!response.hasHeaderValue("Content-Type", "image/png") &&
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request.hasHeaderValue("Accept-Encoding", Compression.GZIP.getTypeId())
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) {
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response.addHeader("Content-Encoding", Compression.GZIP.getTypeId());
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ByteArrayOutputStream byteOut = new ByteArrayOutputStream();
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try (OutputStream os = Compression.GZIP.compress(byteOut)) {
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IOUtils.copyLarge(data.decompress(), os);
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}
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byte[] compressedData = byteOut.toByteArray();
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response.setData(new ByteArrayInputStream(compressedData));
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} else {
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response.setData(new BufferedInputStream(data.decompress()));
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}
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}
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private static String timestampToString(long time){
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return DateFormatUtils.format(time, "EEE, dd MMM yyy HH:mm:ss 'GMT'", TimeZone.getTimeZone("GMT"), Locale.ENGLISH);
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}
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private static long stringToTimestamp(String timeString) throws IllegalArgumentException {
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try {
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int day = Integer.parseInt(timeString.substring(5, 7));
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int month = Calendar.JANUARY;
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switch (timeString.substring(8, 11)){
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case "Feb" : month = Calendar.FEBRUARY; break;
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case "Mar" : month = Calendar.MARCH; break;
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case "Apr" : month = Calendar.APRIL; break;
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case "May" : month = Calendar.MAY; break;
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case "Jun" : month = Calendar.JUNE; break;
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case "Jul" : month = Calendar.JULY; break;
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case "Aug" : month = Calendar.AUGUST; break;
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case "Sep" : month = Calendar.SEPTEMBER; break;
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case "Oct" : month = Calendar.OCTOBER; break;
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case "Nov" : month = Calendar.NOVEMBER; break;
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case "Dec" : month = Calendar.DECEMBER; break;
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}
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int year = Integer.parseInt(timeString.substring(12, 16));
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int hour = Integer.parseInt(timeString.substring(17, 19));
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int min = Integer.parseInt(timeString.substring(20, 22));
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int sec = Integer.parseInt(timeString.substring(23, 25));
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GregorianCalendar cal = new GregorianCalendar(TimeZone.getTimeZone("GMT"));
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cal.set(year, month, day, hour, min, sec);
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return cal.getTimeInMillis();
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} catch (NumberFormatException | IndexOutOfBoundsException e){
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throw new IllegalArgumentException(e);
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}
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}
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}
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