289 lines
9.6 KiB
Java
289 lines
9.6 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 de.bluecolored.bluemap.core.webserver.HttpRequest;
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import de.bluecolored.bluemap.core.webserver.HttpRequestHandler;
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import de.bluecolored.bluemap.core.webserver.HttpResponse;
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import de.bluecolored.bluemap.core.webserver.HttpStatusCode;
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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.nio.file.InvalidPathException;
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import java.nio.file.Path;
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import java.util.GregorianCalendar;
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import java.util.Locale;
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import java.util.Set;
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import java.util.TimeZone;
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import java.util.concurrent.TimeUnit;
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import java.util.zip.GZIPInputStream;
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import java.util.zip.GZIPOutputStream;
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public class FileRequestHandler implements HttpRequestHandler {
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private static final long DEFLATE_MIN_SIZE = 10L * 1024L;
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private static final long DEFLATE_MAX_SIZE = 10L * 1024L * 1024L;
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private static final long INFLATE_MAX_SIZE = 10L * 1024L * 1024L;
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private final Path webRoot;
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private final String serverName;
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private final File emptyTileFile;
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public FileRequestHandler(Path webRoot, String serverName) {
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this.webRoot = webRoot.normalize();
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this.serverName = serverName;
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this.emptyTileFile = webRoot.resolve("assets").resolve("emptyTile.json").toFile();
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}
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@Override
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public HttpResponse handle(HttpRequest request) {
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if (
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!request.getMethod().equalsIgnoreCase("GET") &&
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!request.getMethod().equalsIgnoreCase("POST")
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) return new HttpResponse(HttpStatusCode.NOT_IMPLEMENTED);
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HttpResponse response = generateResponse(request);
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response.addHeader("Server", this.serverName);
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HttpStatusCode status = response.getStatusCode();
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if (status.getCode() >= 400){
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response.setData(status.getCode() + " - " + status.getMessage() + "\n" + this.serverName);
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}
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return response;
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}
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@SuppressWarnings ("resource")
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private HttpResponse generateResponse(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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Path filePath = webRoot;
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try {
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filePath = webRoot.resolve(path);
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} catch (InvalidPathException e){
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return new HttpResponse(HttpStatusCode.NOT_FOUND);
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}
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// can we use deflation?
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boolean isDeflationPossible = request.getLowercaseHeader("Accept-Encoding").contains("gzip");
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boolean isDeflated = false;
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// check if file is in web-root
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if (!filePath.normalize().startsWith(webRoot)){
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return new HttpResponse(HttpStatusCode.FORBIDDEN);
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}
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File file = filePath.toFile();
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// redirect to have correct relative paths
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if (file.isDirectory() && !request.getPath().endsWith("/")) {
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HttpResponse response = new HttpResponse(HttpStatusCode.SEE_OTHER);
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response.addHeader("Location", "/" + path + "/" + (request.getGETParamString().isEmpty() ? "" : "?" + request.getGETParamString()));
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return response;
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}
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if (!file.exists() || file.isDirectory()){
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file = new File(filePath.toString() + ".gz");
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isDeflated = true;
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}
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if (!file.exists() || file.isDirectory()){
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file = new File(filePath.toString() + "/index.html");
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isDeflated = false;
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}
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if (!file.exists() || file.isDirectory()){
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file = new File(filePath.toString() + "/index.html.gz");
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isDeflated = true;
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}
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if (!file.exists() && file.toPath().startsWith(webRoot.resolve("data"))){
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file = emptyTileFile;
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isDeflated = false;
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}
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if (!file.exists() || file.isDirectory()) {
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return new HttpResponse(HttpStatusCode.NOT_FOUND);
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}
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if (isDeflationPossible && (!file.getName().endsWith(".gz"))){
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File deflatedFile = new File(file.getAbsolutePath() + ".gz");
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if (deflatedFile.exists()){
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file = deflatedFile;
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isDeflated = true;
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}
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}
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// check if file is still in web-root and is not a directory
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if (!file.toPath().normalize().startsWith(webRoot) || file.isDirectory()){
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return new HttpResponse(HttpStatusCode.FORBIDDEN);
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}
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// check modified
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long lastModified = file.lastModified();
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Set<String> modStringSet = request.getHeader("If-Modified-Since");
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if (!modStringSet.isEmpty()){
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try {
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long since = stringToTimestamp(modStringSet.iterator().next());
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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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//check ETag
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String eTag = Long.toHexString(file.length()) + Integer.toHexString(file.hashCode()) + Long.toHexString(lastModified);
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Set<String> etagStringSet = request.getHeader("If-None-Match");
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if (!etagStringSet.isEmpty()){
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if(etagStringSet.iterator().next().equals(eTag)) {
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return new HttpResponse(HttpStatusCode.NOT_MODIFIED);
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}
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}
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//create response
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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) response.addHeader("Last-Modified", timestampToString(lastModified));
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response.addHeader("Cache-Control", "public");
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response.addHeader("Cache-Control", "max-age=" + TimeUnit.HOURS.toSeconds(1));
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//add content type header
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String filetype = file.getName();
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if (filetype.endsWith(".gz")) filetype = filetype.substring(0, filetype.length() - 3);
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int pointIndex = filetype.lastIndexOf('.');
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if (pointIndex >= 0) filetype = filetype.substring(pointIndex + 1);
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String contentType = "text/plain";
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switch (filetype) {
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case "json" :
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contentType = "application/json";
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break;
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case "png" :
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contentType = "image/png";
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break;
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case "jpg" :
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case "jpeg" :
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case "jpe" :
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contentType = "image/jpeg";
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break;
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case "svg" :
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contentType = "image/svg+xml";
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break;
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case "css" :
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contentType = "text/css";
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break;
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case "js" :
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contentType = "text/javascript";
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break;
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case "html" :
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case "htm" :
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case "shtml" :
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contentType = "text/html";
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break;
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case "xml" :
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contentType = "text/xml";
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break;
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}
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response.addHeader("Content-Type", contentType);
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try {
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if (isDeflated){
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if (isDeflationPossible || file.length() > INFLATE_MAX_SIZE){
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response.addHeader("Content-Encoding", "gzip");
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response.setData(new FileInputStream(file));
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return response;
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} else {
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response.setData(new GZIPInputStream(new FileInputStream(file)));
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return response;
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}
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} else {
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if (isDeflationPossible && file.length() > DEFLATE_MIN_SIZE && file.length() < DEFLATE_MAX_SIZE){
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FileInputStream fis = new FileInputStream(file);
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ByteArrayOutputStream byteOut = new ByteArrayOutputStream();
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GZIPOutputStream zos = new GZIPOutputStream(byteOut);
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IOUtils.copyLarge(fis, zos);
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zos.close();
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fis.close();
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byte[] compressedData = byteOut.toByteArray();
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response.setData(new ByteArrayInputStream(compressedData));
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response.addHeader("Content-Encoding", "gzip");
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return response;
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} else {
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response.setData(new FileInputStream(file));
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return response;
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}
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}
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} catch (FileNotFoundException e) {
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return new HttpResponse(HttpStatusCode.NOT_FOUND);
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} catch (IOException e) {
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return new HttpResponse(HttpStatusCode.INTERNAL_SERVER_ERROR);
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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 = 1;
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switch (timeString.substring(8, 11)){
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case "Jan" : month = 0; break;
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case "Feb" : month = 1; break;
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case "Mar" : month = 2; break;
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case "Apr" : month = 3; break;
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case "May" : month = 4; break;
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case "Jun" : month = 5; break;
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case "Jul" : month = 6; break;
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case "Aug" : month = 7; break;
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case "Sep" : month = 8; break;
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case "Oct" : month = 9; break;
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case "Nov" : month = 10; break;
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case "Dec" : month = 11; 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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