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.classpath Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<classpath>
<classpathentry kind="src" output="target/classes" path="src/main/java">
<attributes>
<attribute name="optional" value="true"/>
<attribute name="maven.pomderived" value="true"/>
</attributes>
</classpathentry>
<classpathentry excluding="**" kind="src" output="target/classes" path="src/main/resources">
<attributes>
<attribute name="maven.pomderived" value="true"/>
<attribute name="optional" value="true"/>
</attributes>
</classpathentry>
<classpathentry kind="src" output="target/test-classes" path="src/test/java">
<attributes>
<attribute name="test" value="true"/>
<attribute name="optional" value="true"/>
<attribute name="maven.pomderived" value="true"/>
</attributes>
</classpathentry>
<classpathentry excluding="**" kind="src" output="target/test-classes" path="src/test/resources">
<attributes>
<attribute name="test" value="true"/>
<attribute name="maven.pomderived" value="true"/>
<attribute name="optional" value="true"/>
</attributes>
</classpathentry>
<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-17">
<attributes>
<attribute name="module" value="true"/>
<attribute name="maven.pomderived" value="true"/>
</attributes>
</classpathentry>
<classpathentry kind="con" path="org.eclipse.m2e.MAVEN2_CLASSPATH_CONTAINER">
<attributes>
<attribute name="maven.pomderived" value="true"/>
</attributes>
</classpathentry>
<classpathentry kind="output" path="target/classes"/>
</classpath>

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/target/
/.settings/

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.project Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<projectDescription>
<name>jarupdater</name>
<comment></comment>
<projects>
</projects>
<buildSpec>
<buildCommand>
<name>org.eclipse.jdt.core.javabuilder</name>
<arguments>
</arguments>
</buildCommand>
<buildCommand>
<name>org.eclipse.m2e.core.maven2Builder</name>
<arguments>
</arguments>
</buildCommand>
</buildSpec>
<natures>
<nature>org.eclipse.jdt.core.javanature</nature>
<nature>org.eclipse.m2e.core.maven2Nature</nature>
</natures>
</projectDescription>

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LICENSE.md Normal file
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# GNU GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc.
<https://fsf.org/>
Everyone is permitted to copy and distribute verbatim copies of this
license document, but changing it is not allowed.
## Preamble
The GNU General Public License is a free, copyleft license for
software and other kinds of works.
The licenses for most software and other practical works are designed
to take away your freedom to share and change the works. By contrast,
the GNU General Public License is intended to guarantee your freedom
to share and change all versions of a program--to make sure it remains
free software for all its users. We, the Free Software Foundation, use
the GNU General Public License for most of our software; it applies
also to any other work released this way by its authors. You can apply
it to your programs, too.
When we speak of free software, we are referring to freedom, not
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To protect your rights, we need to prevent others from denying you
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## TERMS AND CONDITIONS
### 0. Definitions.
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### 2. Basic Permissions.
All rights granted under this License are granted for the term of
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### 3. Protecting Users' Legal Rights From Anti-Circumvention Law.
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### 4. Conveying Verbatim Copies.
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keep intact all notices of the absence of any warranty; and give all
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You may charge any price or no price for each copy that you convey,
and you may offer support or warranty protection for a fee.
### 5. Conveying Modified Source Versions.
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A compilation of a covered work with other separate and independent
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### 6. Conveying Non-Source Forms.
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### 7. Additional Terms.
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License by making exceptions from one or more of its conditions.
Additional permissions that are applicable to the entire Program shall
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When you convey a copy of a covered work, you may at your option
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### 8. Termination.
You may not propagate or modify a covered work except as expressly
provided under this License. Any attempt otherwise to propagate or
modify it is void, and will automatically terminate your rights under
this License (including any patent licenses granted under the third
paragraph of section 11).
However, if you cease all violation of this License, then your license
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unless and until the copyright holder explicitly and finally
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Moreover, your license from a particular copyright holder is
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Termination of your rights under this section does not terminate the
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### 9. Acceptance Not Required for Having Copies.
You are not required to accept this License in order to receive or run
a copy of the Program. Ancillary propagation of a covered work
occurring solely as a consequence of using peer-to-peer transmission
to receive a copy likewise does not require acceptance. However,
nothing other than this License grants you permission to propagate or
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not accept this License. Therefore, by modifying or propagating a
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### 10. Automatic Licensing of Downstream Recipients.
Each time you convey a covered work, the recipient automatically
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An "entity transaction" is a transaction transferring control of an
organization, or substantially all assets of one, or subdividing an
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You may not impose any further restrictions on the exercise of the
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### 11. Patents.
A "contributor" is a copyright holder who authorizes use under this
License of the Program or a work on which the Program is based. The
work thus licensed is called the contributor's "contributor version".
A contributor's "essential patent claims" are all patent claims owned
or controlled by the contributor, whether already acquired or
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but do not include claims that would be infringed only as a
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Each contributor grants you a non-exclusive, worldwide, royalty-free
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In the following three paragraphs, a "patent license" is any express
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actual knowledge that, but for the patent license, your conveying the
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in a country, would infringe one or more identifiable patents in that
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If, pursuant to or in connection with a single transaction or
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receiving the covered work authorizing them to use, propagate, modify
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you grant is automatically extended to all recipients of the covered
work and works based on it.
A patent license is "discriminatory" if it does not include within the
scope of its coverage, prohibits the exercise of, or is conditioned on
the non-exercise of one or more of the rights that are specifically
granted under this License. You may not convey a covered work if you
are a party to an arrangement with a third party that is in the
business of distributing software, under which you make payment to the
third party based on the extent of your activity of conveying the
work, and under which the third party grants, to any of the parties
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license (a) in connection with copies of the covered work conveyed by
you (or copies made from those copies), or (b) primarily for and in
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covered work, unless you entered into that arrangement, or that patent
license was granted, prior to 28 March 2007.
Nothing in this License shall be construed as excluding or limiting
any implied license or other defenses to infringement that may
otherwise be available to you under applicable patent law.
### 12. No Surrender of Others' Freedom.
If conditions are imposed on you (whether by court order, agreement or
otherwise) that contradict the conditions of this License, they do not
excuse you from the conditions of this License. If you cannot convey a
covered work so as to satisfy simultaneously your obligations under
this License and any other pertinent obligations, then as a
consequence you may not convey it at all. For example, if you agree to
terms that obligate you to collect a royalty for further conveying
from those to whom you convey the Program, the only way you could
satisfy both those terms and this License would be to refrain entirely
from conveying the Program.
### 13. Use with the GNU Affero General Public License.
Notwithstanding any other provision of this License, you have
permission to link or combine any covered work with a work licensed
under version 3 of the GNU Affero General Public License into a single
combined work, and to convey the resulting work. The terms of this
License will continue to apply to the part which is the covered work,
but the special requirements of the GNU Affero General Public License,
section 13, concerning interaction through a network will apply to the
combination as such.
### 14. Revised Versions of this License.
The Free Software Foundation may publish revised and/or new versions
of the GNU General Public License from time to time. Such new versions
will be similar in spirit to the present version, but may differ in
detail to address new problems or concerns.
Each version is given a distinguishing version number. If the Program
specifies that a certain numbered version of the GNU General Public
License "or any later version" applies to it, you have the option of
following the terms and conditions either of that numbered version or
of any later version published by the Free Software Foundation. If the
Program does not specify a version number of the GNU General Public
License, you may choose any version ever published by the Free
Software Foundation.
If the Program specifies that a proxy can decide which future versions
of the GNU General Public License can be used, that proxy's public
statement of acceptance of a version permanently authorizes you to
choose that version for the Program.
Later license versions may give you additional or different
permissions. However, no additional obligations are imposed on any
author or copyright holder as a result of your choosing to follow a
later version.
### 15. Disclaimer of Warranty.
THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT
WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND
PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE
DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR
CORRECTION.
### 16. Limitation of Liability.
IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR
CONVEYS 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 <https://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 <https://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 <https://www.gnu.org/licenses/why-not-lgpl.html>.

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<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>eu.m724</groupId>
<artifactId>jarupdater</artifactId>
<version>0.1.0-SNAPSHOT</version>
<properties>
<maven.compiler.source>17</maven.compiler.source>
<maven.compiler.target>17</maven.compiler.target>
</properties>
<repositories>
<repository>
<id>724rocks</id>
<url>https://git.724.rocks/api/packages/Minecon724/maven</url>
</repository>
</repositories>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-release-plugin</artifactId>
<version>3.0.1</version>
</plugin>
</plugins>
</build>
<distributionManagement>
<repository>
<id>724rocks</id>
<url>https://git.724.rocks/api/packages/Minecon724/maven</url>
</repository>
<snapshotRepository>
<id>724rocks</id>
<url>https://git.724.rocks/api/packages/Minecon724/maven</url>
</snapshotRepository>
</distributionManagement>
<scm>
<developerConnection>scm:git:git@git.724.rocks:Minecon724/jarupdater.git</developerConnection>
</scm>
</project>

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package eu.m724.jarupdater;
import java.io.File;
import java.nio.file.NoSuchFileException;
import java.util.concurrent.CompletableFuture;
import eu.m724.jarupdater.download.Downloader;
import eu.m724.jarupdater.environment.Environment;
import eu.m724.jarupdater.live.MetadataFacade;
import eu.m724.jarupdater.object.Version;
public class Updater {
private Environment environment;
private MetadataFacade metadataProvider;
private Downloader downloader;
private CompletableFuture<File> downloaded;
public Updater(Environment environment, MetadataFacade metadataProvider, Downloader downloader) {
this.environment = environment;
this.metadataProvider = metadataProvider;
this.downloader = downloader;
}
public Environment getEnvironment() {
return environment;
}
public CompletableFuture<Version> getLatestVersion() {
CompletableFuture<Version> currentVersionFuture = metadataProvider.getCurrentVersionMetadata();
CompletableFuture<Version> latestVersionFuture = metadataProvider.getLatestVersionMetadata();
return CompletableFuture.allOf(currentVersionFuture, latestVersionFuture).thenApply(v -> {
Version currentVersion = currentVersionFuture.join();
Version latestVersion = latestVersionFuture.join();
return latestVersion.getId() > currentVersion.getId() ? latestVersion : null;
});
}
public CompletableFuture<Version> getCurrentVersion() {
return metadataProvider.getCurrentVersionMetadata();
}
public CompletableFuture<File> downloadLatestVersion() {
CompletableFuture<Version> latestVersionFuture = metadataProvider.getLatestVersionMetadata();
downloaded = latestVersionFuture.thenApply(latestVersion -> {
String url = latestVersion.getFileUrl();
String hash = latestVersion.getSha256();
File file = downloader.downloadAndVerify(url, hash).join();
return file; // TODO better way of catching exception?
});
return downloaded;
}
/**
* installs the ALREADY DOWNLOADED latest version
* you can call it immediately after {@link #downloadLatestVersion()}
* @return a {@link CompletableFuture} that ends after move. it can throw
* @throws NoSuchFileException if you didn't download it first
*/
public CompletableFuture<Void> installLatestVersion() throws NoSuchFileException {
if (downloaded == null)
throw new NoSuchFileException("Download it first");
return downloaded.thenCompose(file -> downloader.install(file, environment.getRunningJarFilePath().toFile()));
}
}

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package eu.m724.jarupdater.download;
import java.io.File;
import java.util.concurrent.CompletableFuture;
public interface Downloader {
public CompletableFuture<File> downloadAndVerify(String url, String sha256hex);
public CompletableFuture<Void> install(File source, File destination);
}

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package eu.m724.jarupdater.download;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.ProxySelector;
import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpClient.Redirect;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
import java.net.http.HttpResponse.BodyHandlers;
import java.nio.file.Files;
import java.nio.file.StandardCopyOption;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.SignatureException;
import java.util.Arrays;
import java.util.HexFormat;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.CompletionException;
public class SimpleDownloader implements Downloader {
private String branding;
public SimpleDownloader(String branding) {
this.branding = branding;
}
@Override
public CompletableFuture<File> downloadAndVerify(String url, String sha256hex) { // TODO progress?
HttpRequest request = HttpRequest.newBuilder()
.uri(URI.create(url))
.header("User-Agent", "rwu/1") // real weather updater v1
.build();
CompletableFuture<HttpResponse<InputStream>> responseFuture =
HttpClient.newBuilder()
.followRedirects(Redirect.NORMAL)
.proxy(ProxySelector.getDefault()).build().
sendAsync(request, BodyHandlers.ofInputStream());
CompletableFuture<File> fileFuture =
responseFuture.thenApply(response -> {
try (InputStream bodyStream = response.body()) {
File downloadedFile = Files.createTempFile(branding, null).toFile();
MessageDigest messageDigest = MessageDigest.getInstance("SHA-256");
try (FileOutputStream fileStream = new FileOutputStream(downloadedFile)) {
while (bodyStream.available() > 0) {
byte[] bytes = bodyStream.readAllBytes();
messageDigest.update(bytes);
fileStream.write(bytes);
}
}
if (!Arrays.equals(messageDigest.digest(), HexFormat.of().parseHex(sha256hex)))
throw new SignatureException(); // This is not outside try because impact is too small to justify more code
return downloadedFile;
} catch (IOException | NoSuchAlgorithmException | SignatureException e) {
throw new CompletionException(e);
}
});
return fileFuture;
}
@Override
public CompletableFuture<Void> install(File source, File destination) {
return CompletableFuture.runAsync(() -> {
// TODO what if we changed File to Path and every ref in this file
try {
Files.move(source.toPath(), destination.toPath(), StandardCopyOption.REPLACE_EXISTING);
} catch (IOException e) {
throw new CompletionException(e);
}
});
}
}

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package eu.m724.jarupdater.environment;
import java.nio.file.Path;
public class ConstantEnvironment implements Environment {
private String runningVersion;
private String channel;
private Path runningJarFilePath;
public ConstantEnvironment(String runningVersion, String channel, Path runningJarFilePath) {
this.runningVersion = runningVersion;
this.channel = channel;
this.runningJarFilePath = runningJarFilePath;
}
@Override
public String getRunningVersion() {
return runningVersion;
}
@Override
public String getChannel() {
// TODO Auto-generated method stub
return channel;
}
@Override
public Path getRunningJarFilePath() {
return runningJarFilePath;
}
}

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src/main/java/eu/m724/jarupdater/environment/Environment.java Normal file
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package eu.m724.jarupdater.environment;
import java.nio.file.Path;
public interface Environment {
public String getRunningVersion();
public String getChannel();
public Path getRunningJarFilePath();
}

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src/main/java/eu/m724/jarupdater/live/MetadataDAO.java Normal file
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package eu.m724.jarupdater.live;
import java.util.ArrayList;
import java.util.concurrent.CompletableFuture;
import eu.m724.jarupdater.object.Version;
public interface MetadataDAO {
public CompletableFuture<ArrayList<String>> getChannels();
public CompletableFuture<Version> getMetadata(String channel, String version);
}

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package eu.m724.jarupdater.live;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.concurrent.CompletableFuture;
import eu.m724.jarupdater.environment.Environment;
import eu.m724.jarupdater.object.Version;
public class MetadataFacade {
private Environment environment;
private MetadataDAO metadataDao;
private HashMap<String, CompletableFuture<Version>> cache = new HashMap<>();
private CompletableFuture<ArrayList<String>> channels = null;
public MetadataFacade(Environment environment, MetadataDAO metadataDao) {
this.environment = environment;
this.metadataDao = metadataDao;
}
public CompletableFuture<ArrayList<String>> getChannels() {
if (channels == null)
channels = metadataDao.getChannels();
return channels;
}
public CompletableFuture<Version> getLatestVersionMetadata() {
return getVersionMetadata("latest", true);
}
public CompletableFuture<Version> getCurrentVersionMetadata() {
return getVersionMetadata(environment.getRunningVersion());
}
public CompletableFuture<Version> getVersionMetadata(String version, boolean ignoreCache) {
if (!ignoreCache && cache.containsKey(version))
return cache.get(version);
CompletableFuture<Version> future = metadataDao.getMetadata(environment.getChannel(), version);
cache.put(version, future); // TODO should we cache forever?
return future;
}
public CompletableFuture<Version> getVersionMetadata(String version) {
return getVersionMetadata(version, false);
}
}

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src/main/java/eu/m724/jarupdater/object/Version.java Normal file
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package eu.m724.jarupdater.object;
public class Version {
/**
* metadata file version
*/
public static final int SPEC = 1;
private int id;
private long timestamp;
private String label;
private String fileUrl;
private String sha256;
/**
* version id. increments with each version
*/
public int getId() {
return id;
}
/**
* release time of a version
*/
public long getTimestamp() {
return timestamp;
}
/**
* label aka version string
* example: 1.0.0
*/
public String getLabel() {
return label;
}
/**
* url of the downloadable jar file
*/
public String getFileUrl() {
return fileUrl;
}
/**
* sha256 hash of that file
*/
public String getSha256() {
return sha256;
}
}