First commit: AQL-WebService

LICENSE

+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
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+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
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+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.

README.md

+![Java 8](https://img.shields.io/badge/java-8-brightgreen.svg)
+---
+<p align="center">
+	<img src="https://FoelliX.github.io/AQL-System/logo.png" width="299px" /><br />
+	<font style="color: #FFFFFF; font-size: 50px; background: #3c6708; border-top: 17px solid #3c6708; border-radius: 0px 0px 7px 7px; border-left: 20px solid #3c6708; border-right: 20px solid #3c6708; margin-left: -1px;">WebService</font>
+</p>
+
+# AQL-WebService
+The *Android App Analysis Query Language WebService (AQL-WebService)* is a wrapper for [AQL-Systems](https://github.com/FoelliX/AQL-System).
+It makes an AQL-System accessible over the Internet by allowing access through an REST API.
+In this regard, networks of analysis tools can be build by coupling one or more frontends with arbitrary many AQL-WebServices.
+AQL-WebServices can also be chained as indicated in the figure below.
+One example for such a analysis tool network is known as [CoDiDroid](https://github.com/FoelliX/CoDiDroid).
+
+<p align="center">
+	<img src="overview.png" width="400px" style="border-radius:15px" />
+</p>
+
+## Example
+Any AQL-System wrapped in an AQL-WebService can be configured the usual way (See [configuration tutorial](https://github.com/FoelliX/AQL-System/wiki/Configuration)).
+To access the tools configured in an AQL-WebService the configuration associated with the frontend has to specify the webservice as an external tool as explained in the tutorial.
+
+## Configuration, Launch Parameters and Runtime Commands
+Any AQL-WebService must be configured by the parameters in its `config.properties` file.
+The following table explains each of these parameter:
+
+| Entry | Meaning |
+| ----- | ------- |
+| `aqlPath = /path/to/aql` | Defines the path to the directory where the underlying AQL-System's storage or temp files etc. should be stored. |
+| `timeout = 20m` | Defines how long to wait for an answer. Three different units can be used (`s`: seconds, `m`: minutes, `h`: hours). |
+| `preferLoading = false` | Sets the preferLoading option of the underlying AQL-System (Default: `false`). |
+| `queueStart = 10000` | Determines the first id that will be associated with the first query received. Thereafter it is increased with each query. |
+| `allowedURLs = http://localhost` | Defines which remote host are allowed to issue queries to this webservice (Separator: `,`). |
+| `username = aql`, `password = AQL-P4SSw0rd` | Credentials required to access this webservice. |
+| `port = 8080` | Definition of the port to listen on. |
+| `bufferTime = 1000` | Time in milliseconds to collect incoming queries before transferring them to the underlying AQL-System. Required to allow parallel question answering. |
+
+Once an AQL-WebService is configured, certain launch parameters can be used to further influence its execution.
+The table below explains the available launch parameters:
+
+| Parameter	 | Meaning |
+| ---------- | ------- |
+| `-config "X"`, `-cfg "X"`, `-c "X"` | By default the `config.xml` file in the tool’s directory is used as configuration. With this parameter a different configuration file can be chosen. `X` has to reference the path to and the configuration file itself. |
+| `-debug "X"`, `-d "X"` | The output generated during the execution of this tool can be set to different levels. `X` may be set to: `error`, `warning`, `normal`, `debug`, `detailed` (ascending precision from left to right). Additionally it can be set to `short`, the output will then be equal to `normal` but shorter at some points. By default it is set to `normal`. |
+| `-backup`, `-b` | When this launch parameter is provided, the current storage of the underlying AQL-System is backed up on start. |
+| `-reset`, `-r` | By this parameter the storage of the underlying AQL-System is resetted on start. Whenever a backup is scheduled as well, it will be generated before the reset. |
+
+When the AQL-WebService is up and running the following commands can be used to perform the associated actions:
+
+| Command | Action |
+| ------- | ------ |
+| `help` | Shows a list of available commands and other helpful information. |
+| `exit`, `quit` | To stop the webservice. |
+| `change port %PORT%` | The port, to which the webservice is listening to, is changed to %PORT% (e.g. `change port 8081`). |
+| `change username %USERNAME%`, `change password %PASSWORD%` | The credentials to access the webservice are changed (e.g. `change username aqlUser` or `change password S3cR3T!`). |
+| `save` | Stores the current settings in the "config.properties" file. |
+| `info` | Shows some basic information. |
+| `tools` | Shows a list of all tools in the current config. |
+| `backup` | Backups the underlying AQL-System's storage. |
+| `reset` | Resets the underlying AQL-System. |
+
+
+
+## Publications
+- *Together Strong: Cooperative Android App Analysis* (Felix Pauck, Heike Wehrheim)  
+t.b.a.
+
+## License
+The AQL-WebService is licensed under the *GNU General Public License v3* (see [LICENSE](https://github.com/FoelliX/AQL-WebService/blob/master/LICENSE)).
+
+## Contact
+**Felix Pauck** (FoelliX)  
+Paderborn University  
+fpauck@mail.uni-paderborn.de  
+[http://www.FelixPauck.de](http://www.FelixPauck.de)
+
+## Links
+- CoDiDroid, an analysis tool network build out of AQL-WebServices: [https://github.com/FoelliX/CoDiDroid](https://github.com/FoelliX/CoDiDroid)
+- AQL-System, the system wrapped in AQL-WebServices, which can also be used as a frontend interface: [https://github.com/FoelliX/AQL-System](https://github.com/FoelliX/AQL-System)
+- BREW, a frontend implementation for benchmark execution: [https://github.com/FoelliX/BREW](https://github.com/FoelliX/BREW)
+- AQL-Online, a website which can be used as frontend, too.
\ No newline at end of file

_config.yml

+theme: jekyll-theme-slate
+title: AQL-WebService
+description: AQL-WebService wrapper for AQL-Systems
+show_downloads: true
+logo: https://foellix.github.io/AQL-System/logo.png
\ No newline at end of file

config.properties

+aqlPath = D:/xampp/htdocs/AQL-WebService/aql
+timeout = 20m
+preferLoading = false
+queueStart = 10000
+allowedURLs = http://localhost
+username = aql
+password = AQL-P4SSw0rd
+port = 8080
+bufferTime = 1000
\ No newline at end of file

index.html

+<html lang="en">
+	<head>
+		<meta charset="utf-8">
+		<title>AQL-WebService</title>
+	</head>
+	<body>
+		<center>
+			<img src="https://raw.githubusercontent.com/FoelliX/AQL-System/master/logo.png" alt="AQL-Logo" height="150" />
+			<h1>AQL-WebService</h1>
+		</center>
+	</body>
+</html>
\ No newline at end of file

mvn/build.bat

+cd target/build
+"%JAVA_HOME%\bin\jar.exe" uf %1 tool.properties
+del tool.properties
\ No newline at end of file

mvn/build.sh

+#!/bin/bash
+
+cd target/build
+zip -u $1 tool.properties
+rm tool.properties
\ No newline at end of file

pom.xml

+<project xmlns="http://maven.apache.org/POM/4.0.0"
+	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+	<groupId>de.foellix</groupId>
+	<artifactId>AQL-WebService</artifactId>
+	<version>0.1.0</version>
+	<packaging>jar</packaging>
+
+	<name>AQL-WebService</name>
+	<description>Android App Analysis Query Language - Web Service</description>
+	<url>https://FoelliX.github.io/AQL-WebService</url>
+
+	<properties>
+		<project.build.sourceEncoding>ISO-8859-1</project.build.sourceEncoding>
+		<maven.compiler.source>1.8</maven.compiler.source>
+		<maven.compiler.target>1.8</maven.compiler.target>
+		<timestamp>${maven.build.timestamp}</timestamp>
+		<maven.build.timestamp.format>ddMMyyyyHHmmssS</maven.build.timestamp.format>
+	</properties>
+
+	<profiles>
+		<profile>
+			<id>Windows</id>
+			<activation>
+				<os>
+					<family>Windows</family>
+				</os>
+			</activation>
+			<properties>
+				<script.extension>.bat</script.extension>
+			</properties>
+		</profile>
+		<profile>
+			<id>unix</id>
+			<activation>
+				<os>
+					<family>unix</family>
+				</os>
+			</activation>
+			<properties>
+				<script.extension>.sh</script.extension>
+			</properties>
+		</profile>
+	</profiles>
+
+	<build>
+		<defaultGoal>clean install exec:exec</defaultGoal>
+		<directory>target</directory>
+
+		<outputDirectory>target/classes</outputDirectory>
+		<sourceDirectory>src</sourceDirectory>
+		<testSourceDirectory>testsrc</testSourceDirectory>
+
+		<resources>
+			<resource>
+				<directory>${project.basedir}</directory>
+				<includes>
+					<include>tool.properties</include>
+					<include>config.properties</include>
+					<include>index.html</include>
+				</includes>
+				<filtering>true</filtering>
+				<targetPath>${project.basedir}/target/build</targetPath>
+			</resource>
+		</resources>
+
+		<plugins>
+			<plugin>
+				<groupId>org.apache.maven.plugins</groupId>
+				<artifactId>maven-assembly-plugin</artifactId>
+				<version>3.1.0</version>
+				<executions>
+					<execution>
+						<phase>package</phase>
+						<goals>
+							<goal>single</goal>
+						</goals>
+						<configuration>
+							<archive>
+								<manifest>
+									<mainClass>
+										de.foellix.aql.webservice.WebService
+									</mainClass>
+								</manifest>
+							</archive>
+							<descriptorRefs>
+								<descriptorRef>jar-with-dependencies</descriptorRef>
+							</descriptorRefs>
+							<outputDirectory>${project.basedir}/target/build</outputDirectory>
+							<finalName>${project.name}-${project.version}</finalName>
+							<appendAssemblyId>false</appendAssemblyId>
+						</configuration>
+					</execution>
+				</executions>
+			</plugin>
+
+			<plugin>
+				<groupId>org.apache.maven.plugins</groupId>
+				<artifactId>maven-surefire-plugin</artifactId>
+				<version>2.22.0</version>
+			</plugin>
+
+			<plugin>
+				<groupId>org.codehaus.mojo</groupId>
+				<artifactId>exec-maven-plugin</artifactId>
+				<version>1.6.0</version>
+				<executions>
+					<execution>
+						<goals>
+							<goal>exec</goal>
+						</goals>
+					</execution>
+				</executions>
+				<configuration>
+					<executable>mvn/build${script.extension}</executable>
+					<arguments>
+						<argument>${project.name}-${project.version}.jar</argument>
+					</arguments>
+				</configuration>
+			</plugin>
+		</plugins>
+	</build>
+
+
+	<dependencies>
+		<!-- https://mvnrepository.com/artifact/org.glassfish.jersey.inject/jersey-hk2 -->
+		<dependency>
+			<groupId>org.glassfish.jersey.inject</groupId>
+			<artifactId>jersey-hk2</artifactId>
+			<version>2.27</version>
+		</dependency>
+		<!-- https://mvnrepository.com/artifact/org.glassfish.jersey.containers/jersey-container-grizzly2-http -->
+		<dependency>
+			<groupId>org.glassfish.jersey.containers</groupId>
+			<artifactId>jersey-container-grizzly2-http</artifactId>
+			<version>2.27</version>
+		</dependency>
+		<!-- https://mvnrepository.com/artifact/org.glassfish.jersey.media/jersey-media-multipart -->
+		<dependency>
+			<groupId>org.glassfish.jersey.media</groupId>
+			<artifactId>jersey-media-multipart</artifactId>
+			<version>2.27</version>
+		</dependency>
+		<!-- https://mvnrepository.com/artifact/org.junit.jupiter/junit-jupiter-api -->
+		<dependency>
+			<groupId>org.junit.jupiter</groupId>
+			<artifactId>junit-jupiter-api</artifactId>
+			<version>5.4.2</version>
+			<scope>test</scope>
+		</dependency>
+		<!-- https://mvnrepository.com/artifact/org.junit.jupiter/junit-jupiter-engine -->
+		<dependency>
+			<groupId>org.junit.jupiter</groupId>
+			<artifactId>junit-jupiter-engine</artifactId>
+			<version>5.4.2</version>
+			<scope>test</scope>
+		</dependency>
+
+		<!-- AQL Project -->
+		<dependency>
+			<groupId>de.foellix</groupId>
+			<artifactId>AQL-System</artifactId>
+			<version>1.2.0</version>
+			<scope>compile</scope>
+		</dependency>
+	</dependencies>
+
+	<developers>
+		<developer>
+			<name>Felix Pauck</name>
+			<email>fpauck@mail.uni-paderborn.de</email>
+			<organization>Paderborn University</organization>
+			<organizationUrl>https://cs.uni-paderborn.de</organizationUrl>
+		</developer>
+	</developers>
+
+	<licenses>
+		<license>
+			<name>GNU General Public License v3.0</name>
+			<url>https://www.gnu.org/licenses/gpl-3.0.txt</url>
+		</license>
+	</licenses>
+</project>

src/de/foellix/aql/webservice/CORSFilter.java

+package de.foellix.aql.webservice;
+
+import javax.ws.rs.container.ContainerRequestContext;
+import javax.ws.rs.container.ContainerResponseContext;
+import javax.ws.rs.container.ContainerResponseFilter;
+import javax.ws.rs.ext.Provider;
+
+import de.foellix.aql.webservice.config.Config;
+
+@Provider
+public class CORSFilter implements ContainerResponseFilter {
+	@Override
+	public void filter(ContainerRequestContext request, ContainerResponseContext response) {
+		// Find match
+		final String[] targets = Config.getInstance().getProperty(Config.ALLOWED_URLS).replaceAll(" ", "").split(",");
+		String match = null;
+		if (request.getHeaders().get("Origin") == null) {
+			return;
+		}
+		for (final String origin : request.getHeaders().get("Origin")) {
+			for (final String target : targets) {
+				if (origin.equals(target)) {
+					match = target;
+					break;
+				}
+			}
+			if (match != null) {
+				break;
+			}
+		}
+
+		// Assign Headers
+		if (match != null) {
+			response.getHeaders().add("Access-Control-Allow-Origin", match);
+			response.getHeaders().add("Access-Control-Allow-Headers", "origin, content-type, accept, authorization");
+			response.getHeaders().add("Access-Control-Allow-Credentials", "true");
+			response.getHeaders().add("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE, OPTIONS, HEAD");
+		}
+	}
+}
\ No newline at end of file

src/de/foellix/aql/webservice/Index.java

+package de.foellix.aql.webservice;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+
+import de.foellix.aql.Log;
+
+public class Index {
+	private static String indexStr = null;
+	private static File indexFile = null;
+
+	public static String htmlString() {
+		if (indexStr == null) {
+			final File f = new File("index.html");
+			try {
+				final byte[] bytes = Files.readAllBytes(f.toPath());
+				indexStr = new String(bytes, StandardCharsets.UTF_8);
+			} catch (final IOException e) {
+				Log.error("Could not find/read " + f.getAbsolutePath() + ". (" + e.getMessage() + ")");
+			}
+		}
+		return indexStr;
+	}
+
+	public static File htmlFile() {
+		if (indexFile == null) {
+			indexFile = new File("index.html");
+		}
+		return indexFile;
+	}
+}

src/de/foellix/aql/webservice/RequestHandler.java

+package de.foellix.aql.webservice;
+
+import java.io.File;
+import java.util.List;
+
+import javax.ws.rs.Consumes;
+import javax.ws.rs.GET;
+import javax.ws.rs.POST;
+import javax.ws.rs.Path;
+import javax.ws.rs.PathParam;
+import javax.ws.rs.Produces;
+import javax.ws.rs.core.Context;
+import javax.ws.rs.core.MediaType;
+import javax.ws.rs.core.Response;
+
+import org.glassfish.grizzly.http.server.Request;
+import org.glassfish.jersey.media.multipart.FormDataBodyPart;
+import org.glassfish.jersey.media.multipart.FormDataContentDisposition;
+import org.glassfish.jersey.media.multipart.FormDataParam;
+
+import de.foellix.aql.Log;
+import de.foellix.aql.datastructure.handler.AnswerHandler;
+import de.foellix.aql.ui.gui.viewer.web.WebRepresentation;
+import de.foellix.aql.webservice.config.Config;
+import de.foellix.aql.webservice.helper.Helper;
+import de.foellix.aql.webservice.scheduler.PreprocessTask;
+import de.foellix.aql.webservice.scheduler.QueryTask;
+import de.foellix.aql.webservice.scheduler.WebScheduler;
+
+@Path("/")
+public class RequestHandler {
+	@GET
+	@Path("")
+	@Produces(MediaType.TEXT_HTML)
+	public String indexString(@Context Request request) {
+		Helper.log(request.getRemoteAddr() + " requested the index page!", Log.NORMAL);
+
+		return Index.htmlString();
+	}
+
+	@GET
+	@Path("index.html")
+	@Produces(MediaType.TEXT_HTML)
+	public String indexHTML(@Context Request request) {
+		return indexString(request);
+	}
+
+	@POST
+	@Path("ask")
+	@Consumes(MediaType.MULTIPART_FORM_DATA)
+	@Produces(MediaType.TEXT_XML)
+	public String ask(@Context Request request, @FormDataParam("query") String query,
+			@FormDataParam("files") List<FormDataBodyPart> appBodies,
+			@FormDataParam("files") FormDataContentDisposition appInfo, @FormDataParam("timeout") long timeout,
+			@FormDataParam("username") String username, @FormDataParam("password") String password) {
+		Helper.log(request.getRemoteAddr() + " asked question: " + query, Log.NORMAL);
+
+		// Ask directly
+		System.out.println("");
+		String answer;
+		if (Config.getInstance().getProperty(Config.USERNAME).equals(username)
+				&& Config.getInstance().getProperty(Config.PASSWORD).equals(password)) {
+			final QueryTask queryTask = Helper.interpretQuery(query, appBodies);
+			answer = AnswerHandler.createXMLString(WebScheduler.getInstance().ask(queryTask, timeout));
+		} else {
+			answer = "Username and/or password incorrect.";
+		}
+		Log.msg("> ", Log.NORMAL, false);
+		return answer;
+	}
+
+	@POST
+	@Path("ask/{keyword}")
+	@Consumes(MediaType.MULTIPART_FORM_DATA)
+	@Produces("application/vnd.android.package-archive")
+	public Response preprocess(@Context Request request, @FormDataParam("app") List<FormDataBodyPart> appBodies,
+			@FormDataParam("app") FormDataContentDisposition appInfo, @FormDataParam("timeout") long timeout,
+			@FormDataParam("username") String username, @FormDataParam("password") String password,
+			@PathParam("keyword") String keyword) {
+		Helper.log(request.getRemoteAddr() + " issues preprocessor: " + keyword, Log.NORMAL);
+
+		// Ask directly
+		System.out.println("");
+		File preprocessedFile;
+		if (Config.getInstance().getProperty(Config.USERNAME).equals(username)
+				&& Config.getInstance().getProperty(Config.PASSWORD).equals(password)) {
+			final PreprocessTask preprocessTask = Helper.interpretPrepossesorTask(keyword, appBodies);
+			preprocessedFile = WebScheduler.getInstance().preprocess(preprocessTask, timeout);
+		} else {
+			preprocessedFile = null;
+		}
+		Log.msg("> ", Log.NORMAL, false);
+		return Response.ok(preprocessedFile)
+				.header("Content-Disposition", "attachment; filename=" + preprocessedFile.getName()).build();
+	}
+
+	@POST
+	@Path("query")
+	@Consumes(MediaType.MULTIPART_FORM_DATA)
+	@Produces(MediaType.TEXT_PLAIN)
+	public String query(@Context Request request, @FormDataParam("query") String query,
+			@FormDataParam("files") List<FormDataBodyPart> fileBodies,
+			@FormDataParam("files") FormDataContentDisposition fileInfo) {
+		Helper.log(request.getRemoteAddr() + " sent query: " + query, Log.NORMAL);
+
+		// Put task into queue
+		System.out.println("");
+		WebScheduler.getInstance().scheduleTask(Helper.interpretQuery(query, fileBodies));
+		Log.msg("> ", Log.NORMAL, false);
+		return String.valueOf(Config.getInstance().getID());
+	}
+
+	@GET
+	@Path("answer/{id}")
+	public Response answer(@Context Request request, @PathParam("id") int id) {
+		Helper.log(request.getRemoteAddr() + " answer requested: " + id, Log.NORMAL);
+
+		// Get answer and reply
+		final File answer = new File(Config.getInstance().getProperty(Config.ANSWERS_PATH), "answer_" + id + ".xml");
+		if (answer.exists()) {
+			return Response.ok(answer, MediaType.APPLICATION_XML).build();
+		} else {
+			return Response.ok("Not available!", MediaType.TEXT_PLAIN).build();
+		}
+	}
+
+	@GET
+	@Path("webanswer/{id}")
+	public Response webanswer(@Context Request request, @PathParam("id") int id) {
+		Helper.log(request.getRemoteAddr() + " webanswer requested: " + id, Log.NORMAL);
+
+		// Get web-answer and reply
+		final File answer = new File(Config.getInstance().getProperty(Config.ANSWERS_PATH), "answer_" + id + ".xml");
+		if (answer.exists()) {
+			final WebRepresentation webAnswer = new WebRepresentation();
+			final String webAnswerString = webAnswer.toJson(AnswerHandler.parseXML(answer));
+			return Response.ok(webAnswerString, MediaType.APPLICATION_JSON).build();
+		} else {
+			return Response.ok("Not available!", MediaType.TEXT_PLAIN).build();
+		}
+	}
+
+	@GET
+	@Path("status/{id}")
+	@Produces(MediaType.TEXT_PLAIN)
+	public String status(@Context Request request, @PathParam("id") int id) {
+		Helper.log(request.getRemoteAddr() + " status requested: " + id, Log.NORMAL);
+
+		// Get status and reply
+		final QueryTask task = WebScheduler.getInstance().getTask(id);
+		if (task == null) {
+			return "Not available!";
+		}
+		return task.getStatus();
+	}
+}
\ No newline at end of file

src/de/foellix/aql/webservice/WebService.java

+package de.foellix.aql.webservice;
+
+import static org.fusesource.jansi.Ansi.ansi;
+import static org.fusesource.jansi.Ansi.Color.GREEN;
+
+import java.io.File;
+import java.io.IOException;
+import java.net.URI;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Scanner;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+import org.fusesource.jansi.AnsiConsole;
+import org.glassfish.grizzly.http.server.HttpServer;
+import org.glassfish.grizzly.nio.transport.TCPNIOTransport;
+import org.glassfish.grizzly.threadpool.ThreadPoolConfig;
+import org.glassfish.jersey.grizzly2.httpserver.GrizzlyHttpServerFactory;
+import org.glassfish.jersey.server.ResourceConfig;
+import org.glassfish.jersey.server.ServerProperties;
+
+import de.foellix.aql.Log;
+import de.foellix.aql.Properties;
+import de.foellix.aql.config.ConfigHandler;
+import de.foellix.aql.helper.Helper;
+import de.foellix.aql.system.BackupAndReset;
+import de.foellix.aql.webservice.config.Config;
+
+public class WebService {
+	public static String URL = "http://0.0.0.0:8080/AQL-WebService/";
+
+	private static final String CMD_EXIT = "exit";
+	private static final String CMD_QUIT = "quit";
+	private static final String CMD_HELP = "help";
+	private static final String CMD_INFO = "info";
+	private static final String CMD_SAVE = "save";
+	private static final String CMD_CHANGE_PORT = "change port";
+	private static final String CMD_CHANGE_USERNAME = "change username";
+	private static final String CMD_CHANGE_PASSWORD = "change password";
+	private static final String CMD_BACKUP = "backup";
+	private static final String CMD_RESET = "reset";
+	private static final String CMD_TOOLS = "tools";
+
+	public static void main(String[] args) throws IOException {
+		// Initialize
+		URL = "http://0.0.0.0:" + Config.getInstance().getProperty(Config.PORT) + "/AQL-WebService/";
+		Properties.info().ABBREVIATION = "AQL-WebService";
+		Log.setDifferentLogFile(new File(Config.getInstance().getProperty(Config.LOG_FILE)));
+		Log.setShorten(true);
+
+		AnsiConsole.systemInstall();
+		final String authorStr = "Author: " + Properties.info().AUTHOR + " (" + Properties.info().AUTHOR_EMAIL + ")";
+		final String space = "               ".substring(Math.min(Properties.info().VERSION.length() + 3, 15));
+		final String centerspace = "                                        "
+				.substring(Math.min(32, authorStr.length() / 2));
+		Log.msg(ansi().bold().fg(GREEN).a("          ____  _      __          __  _     _____" + space).reset()
+				.a(" v. " + Properties.info().VERSION.substring(0, Math.min(Properties.info().VERSION.length(), 12)))
+				.bold().fg(GREEN)
+				.a(" _          \r\n"
+						+ "    /\\   / __ \\| |     \\ \\        / / | |   / ____|               (_)         \r\n"
+						+ "   /  \\ | |  | | |  ____\\ \\  /\\  / /__| |__| (___   ___ _ ____   ___  ___ ___ \r\n"
+						+ "  / /\\ \\| |  | | | |_____\\ \\/  \\/ / _ \\ '_ \\\\___ \\ / _ \\ '__\\ \\ / / |/ __/ _ \\\r\n"
+						+ " / ____ \\ |__| | |____    \\  /\\  /  __/ |_) |___) |  __/ |   \\ V /| | (_|  __/\r\n"
+						+ "/_/    \\_\\___\\_\\______|    \\/  \\/ \\___|_.__/_____/ \\___|_|    \\_/ |_|\\___\\___|\r\n")
+				.reset().a("\r\n" + centerspace + authorStr + "\r\n"), Log.NORMAL);
+
+		// Parse launch parameters
+		for (int i = 0; i < args.length; i++) {
+			if (args[i].equals("-b") || args[i].equals("-backup")) {
+				BackupAndReset.backup(new File(Config.getInstance().getProperty(Config.STORAGE_PATH)));
+			}
+		}
+		for (int i = 0; i < args.length; i++) {
+			if (args[i].equals("-c") || args[i].equals("-cfg") || args[i].equals("-config")) {
+				ConfigHandler.getInstance().setConfig(new File(args[i + 1]));
+				i++;
+			} else if (args[i].equals("-r") || args[i].equals("-re") || args[i].equals("-reset")) {
+				BackupAndReset.reset(new File(Config.getInstance().getProperty(Config.STORAGE_PATH)));
+				reset();
+			} else if (args[i].equals("-d") || args[i].equals("-debug") || args[i].equals("-reset")) {
+				final String debug = args[i + 1];
+				if (debug.equals("normal")) {
+					Log.setLogLevel(Log.NORMAL);
+				} else if (debug.equals("short")) {
+					Log.setLogLevel(Log.NORMAL);
+					Log.setShorten(true);
+				} else if (debug.equals("warning")) {
+					Log.setLogLevel(Log.WARNING);
+				} else if (debug.equals("error")) {
+					Log.setLogLevel(Log.ERROR);
+				} else if (debug.equals("debug")) {
+					Log.setLogLevel(Log.DEBUG);
+				} else if (debug.equals("detailed")) {
+					Log.setLogLevel(Log.DEBUG_DETAILED);
+				} else if (debug.equals("special")) {
+					Log.setLogLevel(Log.DEBUG_SPECIAL);
+				} else {
+					Log.setLogLevel(Integer.valueOf(debug).intValue());
+				}
+				i++;
+			}
+		}
+
+		// Start server
+		HttpServer server = startServer();
+		Log.msg("\nWebservice started!\n" + info(), Log.NORMAL);
+
+		// Setup
+		try (Scanner sc = new Scanner(System.in)) {
+			String read;
+			do {
+				Log.msg("> ", Log.NORMAL, false);
+				read = sc.nextLine();
+				if (read.equals(CMD_HELP)) {
+					Log.msg("\nAvailable commands:\n0. " + CMD_EXIT + " or " + CMD_QUIT
+							+ " (to stop the web service)\n1. " + CMD_CHANGE_PORT
+							+ " %PORT% (e.g. \"change port 8081\")\n2. " + CMD_CHANGE_USERNAME
+							+ " %USERNAME% (e.g. \"change username aqlUser\")\n3. " + CMD_CHANGE_PASSWORD
+							+ " %PASSWORD% (e.g. \"change password S3cR3T!\")\n4. " + CMD_SAVE
+							+ " (stores the current settings in the \"config.properties\" file)\n5. " + CMD_INFO
+							+ " (shows some basic information)\n6. " + CMD_BACKUP
+							+ " (backups the underlying AQL-System's storage)\n7. " + CMD_RESET
+							+ " (resets the underlying AQL-System)\n8. " + CMD_TOOLS
+							+ " (shows a list of all tools in the current config)\n", Log.NORMAL);
+				} else if (read.equals(CMD_INFO)) {
+					Log.msg(info(), Log.NORMAL);
+				} else if (read.equals(CMD_SAVE)) {
+					Config.getInstance().store();
+					Log.msg("Current settings saved!", Log.NORMAL);
+				} else if (read.startsWith(CMD_CHANGE_PORT)) {
+					server.shutdownNow();
+					final String port = read.replaceAll(CMD_CHANGE_PORT, "").replaceAll(" ", "");
+					Config.getInstance().getProperties().setProperty(Config.PORT, port);
+					server = startServer(port);
+					Log.msg("Port changed to: " + port, Log.NORMAL);
+				} else if (read.startsWith(CMD_CHANGE_USERNAME)) {
+					final String username = read.replaceAll(CMD_CHANGE_USERNAME, "").replaceAll(" ", "");
+					Config.getInstance().getProperties().setProperty(Config.USERNAME, username);
+					Log.msg("Username changed to: " + username, Log.NORMAL);
+				} else if (read.startsWith(CMD_CHANGE_PASSWORD)) {
+					final String password = read.replaceAll(CMD_CHANGE_PASSWORD, "").replaceAll(" ", "");
+					Config.getInstance().getProperties().setProperty(Config.PASSWORD, password);
+					Log.msg("Password changed to: " + password, Log.NORMAL);
+				} else if (read.equals(CMD_BACKUP)) {
+					BackupAndReset.backup(new File(Config.getInstance().getProperty(Config.STORAGE_PATH)));
+				} else if (read.equals(CMD_RESET)) {
+					BackupAndReset.reset(new File(Config.getInstance().getProperty(Config.STORAGE_PATH)));
+				} else if (read.equals(CMD_TOOLS)) {
+					Log.msg(tools(), Log.NORMAL);
+				} else if (!(read.equals(CMD_EXIT) || read.equals(CMD_QUIT))) {
+					Log.msg("Unknown command: " + read + " (Type \"" + CMD_HELP
+							+ "\" to see a list of available commands)", Log.NORMAL);
+				}
+			} while (!(read.equals(CMD_EXIT) || read.equals(CMD_QUIT)));
+		} catch (final Exception e) {
+			Log.error("Web service unexpectedly stopped! (" + e.getMessage() + ")");
+		}
+
+		// Stop server
+		server.shutdownNow();
+		Log.msg("Webservice stopped!", Log.NORMAL);
+	}
+
+	private static void reset() {
+		final File uploadFolder = new File(Config.getInstance().getProperty(Config.UPLOAD_PATH));
+		final boolean failed = de.foellix.aql.webservice.helper.Helper.deleteFolder(uploadFolder);
+		if (failed) {
+			Log.msg("Successfully deleted upload directory!", Log.NORMAL);
+		} else {
+			Log.warning("Could not delete everything inside the upload directory!");
+		}
+		uploadFolder.mkdir();
+
+		Config.getInstance().getProperties().setProperty(Config.QUEUE_START, "10000");
+		Config.getInstance().store();
+	}
+
+	private static String info() {
+		return "\nListening on port " + Config.getInstance().getProperty(Config.PORT) + "\n(" + URL + ")\n\nUsername: "
+				+ Config.getInstance().getProperty(Config.USERNAME) + "\nPassword: "
+				+ Config.getInstance().getProperty(Config.PASSWORD) + "\n\nConfig: "
+				+ ConfigHandler.getInstance().getConfigFile().getAbsolutePath() + "\n";
+	}
+
+	private static String tools() {
+		return (ConfigHandler.getInstance().getConfig().getTools() != null
+				? "\nToollists: " + Helper.toString(ConfigHandler.getInstance().getConfig().getTools().getTool()) + "\n"
+				: "")
+				+ (ConfigHandler.getInstance().getConfig().getPreprocessors() != null ? "\nProprocessors: "
+						+ Helper.toString(ConfigHandler.getInstance().getConfig().getPreprocessors().getTool()) + "\n"
+						: "")
+				+ (ConfigHandler.getInstance().getConfig().getOperators() != null ? "\nOperators: "
+						+ Helper.toString(ConfigHandler.getInstance().getConfig().getOperators().getTool()) + "\n" : "")
+				+ (ConfigHandler.getInstance().getConfig().getConverters() != null ? "\nConverters: "
+						+ Helper.toString(ConfigHandler.getInstance().getConfig().getConverters().getTool()) + "\n"
+						: "");
+	}
+
+	public static HttpServer startServer() {
+		return startServer(null);
+	}
+
+	public static HttpServer startServer(String port) {
+		if (port != null) {
+			URL = "http://0.0.0.0:" + port + "/AQL-WebService/";
+		}
+
+		final ResourceConfig rc = new ResourceConfig();
+		final Map<String, Object> initParams = new HashMap<>();
+		initParams.put(ServerProperties.PROVIDER_PACKAGES, "de.foellix.aql.webservice");
+		initParams.put(ServerProperties.PROVIDER_CLASSNAMES, "org.glassfish.jersey.media.multipart.MultiPartFeature");
+		rc.addProperties(initParams);
+		if (!Log.logIt(Log.DEBUG)) {
+			Logger.getLogger("org.glassfish").setLevel(Level.OFF);
+		}
+
+		final HttpServer grizzly = GrizzlyHttpServerFactory.createHttpServer(URI.create(URL), rc, false);
+
+		final TCPNIOTransport transport = grizzly.getListener("grizzly").getTransport();
+		final ThreadPoolConfig config = ThreadPoolConfig.defaultConfig().setCorePoolSize(128).setMaxPoolSize(128)
+				.setQueueLimit(-1);
+		transport.setWorkerThreadPoolConfig(config);
+
+		try {
+			grizzly.start();
+		} catch (final IOException e) {
+			Log.error("Error occured while starting Grizzly webservice: " + e.getMessage());
+		}
+
+		return grizzly;
+	}
+}
\ No newline at end of file

src/de/foellix/aql/webservice/config/Config.java

+package de.foellix.aql.webservice.config;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.util.Properties;
+import java.util.concurrent.locks.Lock;
+import java.util.concurrent.locks.ReentrantLock;
+
+import de.foellix.aql.Log;
+
+public class Config {
+	public static final String PROPERTIES_FILE = "config.properties";
+
+	public static final String AQL_PATH = "aqlPath";
+	public static final String UPLOAD_PATH = "uploadPath";
+	public static final String STORAGE_PATH = "storagePath";
+	public static final String ANSWERS_PATH = "answersPath";
+	public static final String TEMP_PATH = "tempPath";
+	public static final String LOG_FILE = "logFile";
+	public static final String TIMEOUT = "timeout";
+	public static final String PREFER_LOADING = "preferLoading";
+	public static final String QUEUE_START = "queueStart";
+	public static final String ALLOWED_URLS = "allowedURLs";
+	public static final String USERNAME = "username";
+	public static final String PASSWORD = "password";
+	public static final String PORT = "port";
+	public static final String BUFFER_TIME = "bufferTime";
+
+	private final Properties properties;
+	private int id;
+
+	private Lock lock;
+
+	private static Config instance = new Config();
+
+	private Config() {
+		this.properties = new Properties();
+
+		try (InputStream input = new FileInputStream(PROPERTIES_FILE)) {
+			this.properties.load(input);
+			this.id = Integer.valueOf(getProperty(QUEUE_START));
+		} catch (final IOException e) {
+			Log.error("Could not find/read " + PROPERTIES_FILE + ". (" + e.getMessage() + ")");
+		}
+
+		this.lock = new ReentrantLock();
+	}
+
+	public static Config getInstance() {
+		return instance;
+	}
+
+	public String getProperty(String name) {
+		if (name.equals(UPLOAD_PATH)) {
+			final File temp = new File(this.properties.getProperty(AQL_PATH), "uploads");
+			return temp.getAbsolutePath();
+		} else if (name.equals(STORAGE_PATH)) {
+			final File temp = new File(this.properties.getProperty(AQL_PATH), "data/storage");
+			return temp.getAbsolutePath();
+		} else if (name.equals(ANSWERS_PATH)) {
+			final File temp = new File(this.properties.getProperty(AQL_PATH), "answers");
+			return temp.getAbsolutePath();
+		} else if (name.equals(TEMP_PATH)) {
+			final File temp = new File(this.properties.getProperty(AQL_PATH), "data/temp");
+			return temp.getAbsolutePath();
+		} else if (name.equals(LOG_FILE)) {
+			final File temp = new File(this.properties.getProperty(AQL_PATH), "log.txt");
+			return temp.getAbsolutePath();
+		} else {
+			return this.properties.getProperty(name);
+		}
+	}
+
+	public Properties getProperties() {
+		return this.properties;
+	}
+
+	public int increaseID() {
+		this.lock.lock();
+		this.id++;
+		this.lock.unlock();
+		this.properties.setProperty(QUEUE_START, String.valueOf(this.id));
+		store();
+		return this.id;
+	}
+
+	public int getID() {
+		return this.id;
+	}
+
+	public void store() {
+		try (OutputStream output = new FileOutputStream(PROPERTIES_FILE)) {
+			this.properties.store(output, null);
+		} catch (final Exception e) {
+			Log.error("Could not write " + PROPERTIES_FILE + ". (" + e.getMessage() + ")");
+		}
+	}
+}

src/de/foellix/aql/webservice/helper/Helper.java

+package de.foellix.aql.webservice.helper;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.StandardCopyOption;
+import java.util.ArrayList;
+import java.util.List;
+
+import org.glassfish.jersey.media.multipart.BodyPartEntity;
+import org.glassfish.jersey.media.multipart.FormDataBodyPart;
+
+import de.foellix.aql.Log;
+import de.foellix.aql.config.ConfigHandler;
+import de.foellix.aql.config.Execute;
+import de.foellix.aql.config.Priority;
+import de.foellix.aql.config.Tool;
+import de.foellix.aql.datastructure.App;
+import de.foellix.aql.datastructure.IQuestionNode;
+import de.foellix.aql.datastructure.KeywordsAndConstants;
+import de.foellix.aql.datastructure.handler.QueryHandler;
+import de.foellix.aql.webservice.config.Config;
+import de.foellix.aql.webservice.scheduler.PreprocessTask;
+import de.foellix.aql.webservice.scheduler.QueryTask;
+
+public class Helper {
+	public static Tool fakePreprocessor = null;
+
+	public static String replaceFilesInQuery(String query, List<File> files) {
+		final IQuestionNode queryNode = QueryHandler.parseQuery(query);
+		if (query.contains("?")) {
+			for (final App app : queryNode.getAllApps(true)) {
+				final String temp = app.getFile().replaceAll("\\\\", "/").substring(app.getFile().lastIndexOf("/") + 1);
+				for (final File file : files) {
+					if (file.getName().equals(temp)) {
+						app.setFile(file.getAbsolutePath());
+					}
+				}
+			}
+		}
+		query = queryNode.toString();
+
+		for (int i = 0; i < files.size(); i++) {
+			query = query.replaceAll("%FILE_" + (i + 1) + "%", files.get(i).getAbsolutePath().replaceAll("\\\\", "/"));
+		}
+		return query;
+	}
+
+	public static long getTimeOutByConfig() {
+		long timeout;
+		final String readTimeout = Config.getInstance().getProperty(Config.TIMEOUT);
+		if (readTimeout.contains("h")) {
+			timeout = Integer.parseInt(readTimeout.replaceAll("h", "")) * 3600;
+		} else if (readTimeout.contains("m")) {
+			timeout = Integer.parseInt(readTimeout.replaceAll("m", "")) * 60;
+		} else {
+			timeout = Integer.parseInt(readTimeout.replaceAll("s", ""));
+		}
+		return timeout;
+	}
+
+	public static QueryTask interpretQuery(String query, List<FormDataBodyPart> fileBodies) {
+		Log.msg("Query accepted: " + query, Log.NORMAL);
+
+		try {
+			// Get ID
+			final int id = Config.getInstance().increaseID();
+
+			// Extract files
+			final List<File> files = new ArrayList<>();
+			for (int i = 0; i < fileBodies.size(); i++) {
+				final BodyPartEntity bodyPartEntity = (BodyPartEntity) fileBodies.get(i).getEntity();
+				final String fileName = fileBodies.get(i).getContentDisposition().getFileName();
+				final File fileReceived = new File(Config.getInstance().getProperty(Config.UPLOAD_PATH) + File.separator
+						+ id + File.separator + fileName);
+				fileReceived.getParentFile().mkdirs();
+				try {
+					Files.copy(bodyPartEntity.getInputStream(), fileReceived.toPath(),
+							StandardCopyOption.REPLACE_EXISTING);
+				} catch (final IOException e) {
+					if (!fileReceived.exists()) {
+						Log.error("Could not copy " + fileReceived.toPath() + " to server ("
+								+ e.getClass().getSimpleName() + "): " + e.getMessage());
+					} else {
+						Log.warning(fileReceived.toPath() + " already exists (" + e.getClass().getSimpleName() + "): "
+								+ e.getMessage());
+					}
+				}
+				files.add(fileReceived);
+			}
+
+			// Update query
+			query = Helper.replaceFilesInQuery(query, files);
+
+			return new QueryTask(query, id);
+		} catch (final Exception e) {
+			Log.error("Could not interpret query (" + e.getClass().getSimpleName() + "): " + e.getMessage());
+			e.printStackTrace();
+			return null;
+		}
+	}
+
+	public static PreprocessTask interpretPrepossesorTask(String keyword, List<FormDataBodyPart> fileBodies) {
+		Log.msg("Preprocessor task accepted: " + keyword, Log.NORMAL);
+
+		try {
+			// Get ID
+			final int id = Config.getInstance().increaseID();
+
+			// Extract file
+			final BodyPartEntity bodyPartEntity = (BodyPartEntity) fileBodies.iterator().next().getEntity();
+			final String fileName = fileBodies.iterator().next().getContentDisposition().getFileName();
+			final File fileReceived = new File(Config.getInstance().getProperty(Config.UPLOAD_PATH) + File.separator
+					+ id + File.separator + fileName);
+			fileReceived.getParentFile().mkdirs();
+			try {
+				Files.copy(bodyPartEntity.getInputStream(), fileReceived.toPath(), StandardCopyOption.REPLACE_EXISTING);
+			} catch (final IOException e) {
+				if (!fileReceived.exists()) {
+					Log.error("Could not copy " + fileReceived.toPath() + " to server (" + e.getClass().getSimpleName()
+							+ "): " + e.getMessage());
+				} else {
+					Log.warning(fileReceived.toPath() + " already exists (" + e.getClass().getSimpleName() + "): "
+							+ e.getMessage());
+				}
+			}
+
+			return new PreprocessTask(keyword, fileReceived, id);
+		} catch (final Exception e) {
+			Log.error(
+					"Could not interpret preprocessor task (" + e.getClass().getSimpleName() + "): " + e.getMessage());
+			e.printStackTrace();
+			return null;
+		}
+	}
+
+	public static void log(String msg, int loglevel) {
+		System.out.println("");
+		Log.msg(msg, Log.IMPORTANT);
+		Log.msg("> ", Log.NORMAL, false);
+	}
+
+	public static Tool getFakeToolForPreprocessing() {
+		if (fakePreprocessor == null) {
+			// Create new tool
+			fakePreprocessor = new Tool();
+
+			// Unify tool name
+			String fakePreprocessorName = "FakePreprocessor";
+			int unifier = 0;
+			while (ConfigHandler.getInstance().getToolByName(fakePreprocessorName) != null) {
+				unifier++;
+				if (unifier == 1) {
+					fakePreprocessorName = fakePreprocessorName + "_unified_";
+				}
+				fakePreprocessorName = fakePreprocessorName + unifier;
+			}
+			fakePreprocessor.setName(fakePreprocessorName);
+
+			// Setup execution properties
+			final Execute fakeExecute = new Execute();
+			fakeExecute.setInstances(0);
+			fakeExecute.setMemoryPerInstance(1);
+			fakeExecute.setRun("echo noExecution");
+			fakeExecute.setResult(
+					new File(Config.getInstance().getProperty(Config.TEMP_PATH), "%APP_APK_FILENAME%_fakeForPP.xml")
+							.getAbsolutePath());
+			fakePreprocessor.setExecute(fakeExecute);
+
+			// Setup other properties
+			fakePreprocessor.setExternal(false);
+			fakePreprocessor.setVersion("fake");
+			fakePreprocessor.setPath("/");
+			fakePreprocessor.setQuestions(KeywordsAndConstants.SOI_PERMISSIONS);
+
+			// Setup priority
+			final Priority fakePriority = new Priority();
+			fakePriority.setValue(Integer.MAX_VALUE);
+			fakePreprocessor.getPriority().add(fakePriority);
+		}
+		return fakePreprocessor;
+	}
+
+	public static boolean deleteFolder(File folder) {
+		for (final File file : folder.listFiles()) {
+			if (file.isDirectory()) {
+				deleteFolder(file);
+			} else {
+				file.delete();
+			}
+		}
+		return folder.delete();
+	}
+}

src/de/foellix/aql/webservice/scheduler/CreateAnswerFileHook.java

+package de.foellix.aql.webservice.scheduler;
+
+import java.io.File;
+
+import de.foellix.aql.datastructure.Answer;
+import de.foellix.aql.datastructure.App;
+import de.foellix.aql.datastructure.Permission;
+import de.foellix.aql.datastructure.Permissions;
+import de.foellix.aql.datastructure.Reference;
+import de.foellix.aql.datastructure.handler.AnswerHandler;
+import de.foellix.aql.helper.Helper;
+import de.foellix.aql.system.task.ITaskHook;
+import de.foellix.aql.system.task.TaskInfo;
+import de.foellix.aql.system.task.ToolTaskInfo;
+
+public class CreateAnswerFileHook implements ITaskHook {
+	@Override
+	public void execute(TaskInfo taskinfo) {
+		if (taskinfo instanceof ToolTaskInfo) {
+			final Answer answer = new Answer();
+			final Permission permission = new Permission();
+			permission.setName("No permission! Just for file transfer!");
+			final Reference reference = new Reference();
+			final File apkFile = new File(
+					((ToolTaskInfo) taskinfo).getQuestion().getAllReferences().iterator().next().getApp().getFile());
+			final App app = Helper.createApp(apkFile);
+			reference.setApp(app);
+			permission.setReference(reference);
+			answer.setPermissions(new Permissions());
+			answer.getPermissions().getPermission().add(permission);
+
+			String filename = taskinfo.getTool().getExecute().getResult();
+			filename = Helper.replaceVariables(filename, taskinfo, app);
+
+			AnswerHandler.createXML(answer, new File(filename));
+		}
+	}
+}
\ No newline at end of file

src/de/foellix/aql/webservice/scheduler/PreprocessTask.java

+package de.foellix.aql.webservice.scheduler;
+
+import java.io.File;
+
+import de.foellix.aql.webservice.helper.Helper;
+
+public class PreprocessTask {
+	final int id;
+	final String keyword;
+	final File target;
+	String status;
+
+	public PreprocessTask(String keyword, File target, int id) {
+		this.id = id;
+		this.keyword = keyword;
+		this.target = target;
+		this.status = "In Queue";
+	}
+
+	public String createQuery() {
+		return "Permissions IN App('" + this.target.getAbsolutePath() + "' | '" + this.keyword + "') FEATURING '"
+				+ Helper.getFakeToolForPreprocessing().getName() + "' ?";
+	}
+
+	public int getId() {
+		return this.id;
+	}
+
+	public String getKeyword() {
+		return this.keyword;
+	}
+
+	public File getTarget() {
+		return this.target;
+	}
+
+	public String getStatus() {
+		return this.status;
+	}
+
+	public void setStatus(String status) {
+		this.status = status;
+	}
+}

src/de/foellix/aql/webservice/scheduler/QueryTask.java

+package de.foellix.aql.webservice.scheduler;
+
+public class QueryTask {
+	private final int id;
+	private final String query;
+	private String status;
+
+	public QueryTask(String query, int id) {
+		this.id = id;
+		this.query = query;
+		this.status = "In Queue";
+	}
+
+	public int getId() {
+		return this.id;
+	}
+
+	public String getQuery() {
+		return this.query;
+	}
+
+	public String getStatus() {
+		return this.status;
+	}
+
+	public void setStatus(String status) {
+		this.status = status;
+	}
+}

src/de/foellix/aql/webservice/scheduler/WebScheduler.java

+package de.foellix.aql.webservice.scheduler;
+
+import java.io.File;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Map;
+import java.util.Queue;
+import java.util.concurrent.locks.Lock;
+import java.util.concurrent.locks.ReentrantLock;
+
+import de.foellix.aql.Log;
+import de.foellix.aql.config.ConfigHandler;
+import de.foellix.aql.datastructure.Answer;
+import de.foellix.aql.system.Storage;
+import de.foellix.aql.system.task.ITaskHook;
+import de.foellix.aql.system.task.OperatorTask;
+import de.foellix.aql.ui.cli.OutputWriter;
+import de.foellix.aql.webservice.config.Config;
+import de.foellix.aql.webservice.helper.Helper;
+
+public class WebScheduler {
+	private long TIME_TO_LOAD_PRECOMPUTED_ANSWERS = 60; // in seconds
+
+	private Queue<QueryTask> queue;
+	private Map<Integer, QueryTask> mapDone;
+	private de.foellix.aql.system.System aqlSystem;
+	private OutputWriter outputWriter;
+
+	List<QueryTask> queryBuffer;
+	List<PreprocessTask> pptBuffer;
+	long bufferTimeout;
+
+	private Lock lock;
+	private boolean flushBuffer;
+	private boolean running;
+
+	private static WebScheduler instance = new WebScheduler();
+
+	private WebScheduler() {
+		this.queryBuffer = new ArrayList<>();
+		this.pptBuffer = new ArrayList<>();
+		this.bufferTimeout = 0;
+
+		this.lock = new ReentrantLock();
+		this.flushBuffer = true;
+		this.running = false;
+
+		// Setup Queue
+		this.queue = new LinkedList<>();
+		this.mapDone = new HashMap<>();
+
+		// Setup AQL-System
+		OperatorTask.setTempDirectory(new File(Config.getInstance().getProperty(Config.TEMP_PATH)));
+		new File(Config.getInstance().getProperty(Config.STORAGE_PATH)).mkdirs();
+		Storage.getInstance().setDifferentStorageLocation(Config.getInstance().getProperty(Config.STORAGE_PATH));
+		File configFile = ConfigHandler.getInstance().getConfigFile();
+		if (!configFile.exists()) {
+			if (ConfigHandler.getInstance().getConfigFile() != null
+					&& !ConfigHandler.getInstance().getConfigFile().equals("")
+					&& !ConfigHandler.getInstance().getConfigFile().equals(" ")) {
+				Log.warning("Could not find/read desired config file: " + configFile.getAbsolutePath());
+			}
+			try {
+				configFile = new File("config.xml");
+			} catch (final Exception e) {
+				Log.error("Could not find/read default config file.");
+				return;
+			}
+		}
+		ConfigHandler.getInstance().setConfig(configFile);
+		this.aqlSystem = new de.foellix.aql.system.System();
+		this.aqlSystem.setStoreAnswers(false);
+		new File(Config.getInstance().getProperty(Config.ANSWERS_PATH)).mkdirs();
+		this.aqlSystem.getScheduler().setTimeout(Helper.getTimeOutByConfig());
+		this.aqlSystem.getScheduler()
+				.setAlwaysPreferLoading(Boolean.valueOf(Config.getInstance().getProperty(Config.PREFER_LOADING)));
+	}
+
+	public static WebScheduler getInstance() {
+		return instance;
+	}
+
+	public void queryNextTask(QueryTask task) {
+		this.running = true;
+		this.mapDone.put(task.getId(), task);
+
+		// Ask AQL-System
+		task.setStatus("In Progress");
+		if (this.outputWriter != null) {
+			this.aqlSystem.getAnswerReceivers().remove(this.outputWriter);
+		}
+		this.outputWriter = new OutputWriter(
+				new File(Config.getInstance().getProperty(Config.ANSWERS_PATH), "answer_" + task.getId() + ".xml"));
+		this.aqlSystem.getAnswerReceivers().add(this.outputWriter);
+		this.aqlSystem.queryAndWait(task.getQuery()).iterator().next();
+		task.setStatus("Done");
+
+		// Next task
+		if (!this.queue.isEmpty() && this.aqlSystem.getScheduler().getWaiting() <= 0) {
+			queryNextTask(this.queue.poll());
+		} else {
+			this.running = false;
+		}
+	}
+
+	public Answer ask(QueryTask task, long timeout) {
+		try {
+			this.lock.lock();
+			final long backupTimeout = this.aqlSystem.getScheduler().getTimeout();
+			final long currentTimeout = Math.min(timeout, backupTimeout);
+
+			this.queryBuffer.add(task);
+			this.bufferTimeout = Math.max(this.bufferTimeout, this.bufferTimeout + currentTimeout);
+			this.lock.unlock();
+
+			try {
+				Thread.sleep(Integer.valueOf(Config.getInstance().getProperty(Config.BUFFER_TIME)).intValue());
+			} catch (final InterruptedException e) {
+				Log.error("Scheduler interrupted while buffering requests: " + e.getMessage());
+			}
+
+			this.lock.lock();
+			if (this.flushBuffer && !this.queryBuffer.isEmpty()) {
+				this.flushBuffer = false;
+				final List<QueryTask> removeList = new ArrayList<>();
+				final StringBuilder sb = new StringBuilder();
+				for (final QueryTask t : this.queryBuffer) {
+					sb.append(t.getQuery() + " \n");
+					removeList.add(t);
+				}
+				this.queryBuffer.removeAll(removeList);
+				if (this.bufferTimeout <= 0) {
+					this.aqlSystem.getScheduler().setTimeout(Helper.getTimeOutByConfig());
+				} else {
+					this.aqlSystem.getScheduler().setTimeout(this.bufferTimeout);
+				}
+				this.bufferTimeout = 0;
+				this.aqlSystem.queryAndWait(sb.toString());
+				this.flushBuffer = true;
+			}
+			this.lock.unlock();
+
+			while (!this.flushBuffer) {
+				try {
+					Thread.sleep(1000);
+				} catch (final InterruptedException e) {
+					Log.error("Scheduler interrupted while waiting for buffer to be flushed: " + e.getMessage());
+				}
+			}
+
+			this.lock.lock();
+			this.aqlSystem.getScheduler().setTimeout(this.TIME_TO_LOAD_PRECOMPUTED_ANSWERS);
+			final Answer answer;
+			final Collection<Answer> candidates = this.aqlSystem.queryAndWait(task.getQuery());
+			if (candidates != null && candidates.iterator().hasNext()) {
+				answer = candidates.iterator().next();
+			} else {
+				answer = new Answer();
+			}
+			if (backupTimeout != this.aqlSystem.getScheduler().getTimeout()) {
+				this.aqlSystem.getScheduler().setTimeout(backupTimeout);
+			}
+			this.lock.unlock();
+
+			return answer;
+		} catch (final Exception e) {
+			final StringBuilder sb = new StringBuilder();
+			for (final QueryTask t : this.queryBuffer) {
+				if (t == null) {
+					sb.append("null;\n");
+				} else {
+					sb.append(t.getQuery() + ";\n");
+				}
+			}
+
+			Log.error("While working on\n" + sb.toString() + "an unexpected exception was thrown ("
+					+ e.getClass().getSimpleName() + "): " + e.getMessage());
+			e.printStackTrace();
+			return null;
+		}
+	}
+
+	public File preprocess(PreprocessTask task, long timeout) {
+		try {
+			this.lock.lock();
+			final long backupTimeout = this.aqlSystem.getScheduler().getTimeout();
+			final long currentTimeout = Math.min(timeout, backupTimeout);
+
+			this.pptBuffer.add(task);
+			this.bufferTimeout = Math.max(this.bufferTimeout, this.bufferTimeout + currentTimeout);
+			this.lock.unlock();
+
+			try {
+				Thread.sleep(Integer.valueOf(Config.getInstance().getProperty(Config.BUFFER_TIME)).intValue());
+			} catch (final InterruptedException e) {
+				Log.error("Scheduler interrupted while buffering requests: " + e.getMessage());
+			}
+
+			this.lock.lock();
+			if (this.flushBuffer && !this.pptBuffer.isEmpty()) {
+				this.flushBuffer = false;
+				final List<PreprocessTask> removeList = new ArrayList<>();
+				final StringBuilder sb = new StringBuilder();
+				for (final PreprocessTask t : this.pptBuffer) {
+					sb.append(t.createQuery() + " \n");
+					removeList.add(t);
+				}
+				this.pptBuffer.removeAll(removeList);
+				if (this.bufferTimeout <= 0) {
+					this.aqlSystem.getScheduler().setTimeout(Helper.getTimeOutByConfig());
+				} else {
+					this.aqlSystem.getScheduler().setTimeout(this.bufferTimeout);
+				}
+				this.bufferTimeout = 0;
+				activateFakeTool(true);
+				this.aqlSystem.queryAndWait(sb.toString());
+				activateFakeTool(false);
+				this.flushBuffer = true;
+			}
+			this.lock.unlock();
+
+			while (!this.flushBuffer) {
+				try {
+					Thread.sleep(1000);
+				} catch (final InterruptedException e) {
+					Log.error("Scheduler interrupted while waiting for buffer to be flushed: " + e.getMessage());
+				}
+			}
+
+			this.lock.lock();
+			this.aqlSystem.getScheduler().setTimeout(this.TIME_TO_LOAD_PRECOMPUTED_ANSWERS);
+			activateFakeTool(true);
+			final Answer answer;
+			final Collection<Answer> candidates = this.aqlSystem.queryAndWait(task.createQuery());
+			if (candidates != null && candidates.iterator().hasNext()) {
+				answer = candidates.iterator().next();
+			} else {
+				answer = new Answer();
+			}
+			activateFakeTool(false);
+			if (backupTimeout != this.aqlSystem.getScheduler().getTimeout()) {
+				this.aqlSystem.getScheduler().setTimeout(backupTimeout);
+			}
+			this.lock.unlock();
+
+			return new File(
+					answer.getPermissions().getPermission().iterator().next().getReference().getApp().getFile());
+		} catch (final Exception e) {
+			final StringBuilder sb = new StringBuilder();
+			for (final PreprocessTask t : this.pptBuffer) {
+				if (t == null) {
+					sb.append("null;\n");
+				} else {
+					sb.append(t.getKeyword() + ";\n");
+				}
+			}
+
+			Log.error("While working on\n" + sb.toString() + "an unexpected exception was thrown ("
+					+ e.getClass().getSimpleName() + "): " + e.getMessage());
+			e.printStackTrace();
+			return null;
+		}
+	}
+
+	private void activateFakeTool(boolean value) {
+		if (value) {
+			if (!ConfigHandler.getInstance().getConfig().getTools().getTool()
+					.contains(Helper.getFakeToolForPreprocessing())) {
+				ConfigHandler.getInstance().getConfig().getTools().getTool().add(Helper.getFakeToolForPreprocessing());
+
+				if (this.aqlSystem.getTaskHooksBefore().getHooks().get(Helper.getFakeToolForPreprocessing()) == null) {
+					final List<ITaskHook> temp = new ArrayList<>();
+					temp.add(new CreateAnswerFileHook());
+					this.aqlSystem.getTaskHooksBefore().getHooks().put(Helper.getFakeToolForPreprocessing(), temp);
+				}
+			}
+		} else {
+			if (ConfigHandler.getInstance().getConfig().getTools().getTool()
+					.contains(Helper.getFakeToolForPreprocessing())) {
+				ConfigHandler.getInstance().getConfig().getTools().getTool()
+						.remove(Helper.getFakeToolForPreprocessing());
+			}
+		}
+	}
+
+	public void scheduleTask(QueryTask task) {
+		if (!this.running) {
+			new Thread(() -> {
+				queryNextTask(task);
+			}).start();
+		} else {
+			this.queue.add(task);
+		}
+	}
+
+	public QueryTask getTask(int id) {
+		if (this.mapDone.get(id) != null) {
+			return this.mapDone.get(id);
+		}
+		for (final QueryTask task : this.queue) {
+			if (task.getId() == id) {
+				return task;
+			}
+		}
+		return null;
+	}
+}

testsrc/de/foellix/aql/webservice/ServerReachabilityTest.java

+package de.foellix.aql.webservice;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import javax.ws.rs.client.Client;
+import javax.ws.rs.client.ClientBuilder;
+import javax.ws.rs.client.WebTarget;
+
+import org.glassfish.grizzly.http.server.HttpServer;
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+
+public class ServerReachabilityTest {
+	private static HttpServer server;
+	private static WebTarget target;
+
+	@BeforeAll
+	public static void startServer() {
+		server = WebService.startServer();
+		final Client c = ClientBuilder.newClient();
+		target = c.target(WebService.URL);
+	}
+
+	@AfterAll
+	public static void stopServer() {
+		server.stop();
+	}
+
+	@Test
+	public void test() {
+		final String responseMsg = target.path("index.html").request().get(String.class);
+		assertEquals(Index.htmlString(), responseMsg);
+	}
+}