Initial work on loading libraries on runtime

build-logic/src/main/kotlin/floodgate.dependency-hash.gradle.kts

@@ -0,0 +1,93 @@
+import java.nio.file.Files
+import java.nio.file.Path
+import java.security.MessageDigest
+import java.util.*
+
+plugins {
+    `java-library`
+}
+
+tasks.register("listDependencyInfo") {
+    doLast {
+        listDependencies().forEach {
+            println(it)
+        }
+    }
+}
+
+tasks.register("writeDependencyInfo") {
+    doLast {
+        Files.writeString(
+            dependenciesInfoFile(),
+            dependenciesToString(listDependencies())
+        )
+    }
+}
+
+tasks.register("checkDependencyInfoFile") {
+    doLast {
+        val asString = dependenciesToString(listDependencies())
+        if (!asString.contentEquals(Files.readString(dependenciesInfoFile()))) {
+            throw IllegalStateException("The dependency hashes file is outdated!")
+        }
+        println("The dependency hashes file is up-to-date")
+    }
+}
+
+tasks.named("build") {
+    dependsOn("checkDependencyHashesFile")
+}
+
+fun dependenciesToString(dependencies: Collection<Dependency>): String {
+    val builder = StringBuilder()
+    dependencies.forEach {
+        if (builder.length > 1) {
+            builder.append("\n")
+        }
+        builder.append(it)
+    }
+    return builder.toString()
+}
+
+fun dependenciesInfoFile(): Path {
+    return project.projectDir.toPath().resolve("src/main/resources/dependencyInfo.txt")
+}
+
+fun listDependencies(): Collection<Dependency> {
+    return listConfigurationDependencies(configurations.default.get())
+}
+
+fun listConfigurationDependencies(configuration: Configuration): Collection<Dependency> {
+    val deps = configuration.resolvedConfiguration.firstLevelModuleDependencies
+        .associateBy({"${it.moduleGroup}:${it.moduleName}"}, {it})
+
+    return configuration.resolvedConfiguration.resolvedArtifacts
+        .mapNotNull {
+            val id = it.id.componentIdentifier
+            if (id is ModuleComponentIdentifier && deps.containsKey("${id.group}:${id.module}")) {
+                convertDependency(id, it.file)
+            } else {
+                null
+            }
+        }
+}
+
+fun convertDependency(id: ModuleComponentIdentifier, file: File): Dependency {
+    return Dependency(id.group, id.module, id.version, calculateSha256(file))
+}
+
+fun calculateSha256(file: File): String {
+    val digest = MessageDigest.getInstance("SHA-256")
+    return Base64.getEncoder().encodeToString(digest.digest(file.readBytes()))
+}
+
+data class Dependency(
+    val groupId: String,
+    val artifactId: String,
+    val version: String,
+    val sha256: String
+) {
+    override fun toString(): String {
+        return arrayOf(groupId, artifactId, version, sha256).joinToString(":")
+    }
+}

core/build.gradle.kts

@@ -1,5 +1,6 @@
 plugins {
     id("floodgate.generate-templates")
+    id("floodgate.dependency-hash")
     id("io.micronaut.library") version "3.7.4"
 }
 

core/src/main/java/org/geysermc/floodgate/core/FloodgatePlatform.java

@@ -26,6 +26,7 @@
 package org.geysermc.floodgate.core;
 
 import io.micronaut.context.ApplicationContext;
+import java.nio.file.Paths;
 import java.util.Map;
 import java.util.UUID;
 import org.geysermc.floodgate.api.FloodgateApi;
@@ -42,6 +43,10 @@ import org.geysermc.floodgate.core.database.entity.LinkedPlayer;
 import org.geysermc.floodgate.core.event.EventBus;
 import org.geysermc.floodgate.core.event.lifecycle.PostEnableEvent;
 import org.geysermc.floodgate.core.event.lifecycle.ShutdownEvent;
+import org.geysermc.floodgate.core.library.Library;
+import org.geysermc.floodgate.core.library.LibraryManager;
+import org.geysermc.floodgate.core.library.Repository;
+import org.geysermc.floodgate.core.library.info.DependencyInfoLoader;
 import org.geysermc.floodgate.core.util.EagerSingleton;
 
 public abstract class FloodgatePlatform {
@@ -56,6 +61,21 @@ public abstract class FloodgatePlatform {
     public void load() {
         long startTime = System.currentTimeMillis();
 
+        var infoLoader = DependencyInfoLoader.load(
+                getClass().getClassLoader().getResource("dependencyInfo.txt")
+        );
+
+        new LibraryManager(ClassLoader.getSystemClassLoader().getParent(), Paths.get("./libs"))
+                .addLibrary(
+                        Library.builder(infoLoader)
+                                .id("guava")
+                                .repository(Repository.MAVEN_CENTRAL)
+                                .groupId("com.google.guava")
+                                .artifactId("guava")
+                                .build()
+                )
+                .apply();
+
         //noinspection unchecked
         context = ApplicationContext.builder()
                 .properties(Map.of(

core/src/main/java/org/geysermc/floodgate/core/library/Library.java

@@ -0,0 +1,159 @@
+/*
+ * Copyright (c) 2019-2023 GeyserMC. http://geysermc.org
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * @author GeyserMC
+ * @link https://github.com/GeyserMC/Floodgate
+ */
+
+package org.geysermc.floodgate.core.library;
+
+import java.nio.file.Path;
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+import java.util.Arrays;
+import java.util.Base64;
+import java.util.Objects;
+import org.checkerframework.checker.nullness.qual.NonNull;
+import org.geysermc.floodgate.core.library.info.DependencyInfo;
+import org.geysermc.floodgate.core.library.info.DependencyInfoLoader;
+import org.geysermc.floodgate.core.util.Utils;
+
+public record Library(
+        @NonNull String id,
+        @NonNull Repository repository,
+        @NonNull String groupId,
+        @NonNull String artifactId,
+        @NonNull String version,
+        byte[] sha256
+) {
+    public Library {
+        Objects.requireNonNull(id);
+        Objects.requireNonNull(repository);
+        Objects.requireNonNull(groupId);
+        Objects.requireNonNull(artifactId);
+        Objects.requireNonNull(version);
+    }
+
+    public String path() {
+        return "%s/%s/%s/%s-%s.jar".formatted(
+                groupId.replace('.', '/'),
+                artifactId,
+                version,
+                artifactId,
+                version
+        );
+    }
+
+    public static LibraryBuilder builder() {
+        return builder(null);
+    }
+
+    public static LibraryBuilder builder(DependencyInfoLoader info) {
+        return new LibraryBuilder(info);
+    }
+
+    public Path filePath() {
+        return Path.of(id(), id() + "-" + version() + ".jar");
+    }
+
+    public void validateChecksum(byte[] data) {
+        byte[] hash;
+        try {
+            hash = MessageDigest.getInstance("SHA-256").digest(data);
+        } catch (NoSuchAlgorithmException exception) {
+            throw new RuntimeException(exception);
+        }
+
+        if (Arrays.equals(hash, sha256)) {
+            return;
+        }
+
+        throw new IllegalStateException(String.format(
+                "Downloaded library hash (%s) didn't match expected hash (%s)!",
+                Utils.base64Encode(data),
+                Utils.base64Encode(sha256())
+        ));
+    }
+
+    public static class LibraryBuilder {
+        private final DependencyInfoLoader dependencyInfoLoader;
+
+        private String id;
+        private Repository repository;
+        private String groupId;
+        private String artifactId;
+
+        private String version;
+        private byte[] sha256;
+
+        LibraryBuilder(DependencyInfoLoader info) {
+            this.dependencyInfoLoader = info;
+        }
+
+        public LibraryBuilder id(String id) {
+            this.id = id;
+            return this;
+        }
+
+        public LibraryBuilder repository(@NonNull Repository repository) {
+            this.repository = Objects.requireNonNull(repository);
+            return this;
+        }
+
+        public LibraryBuilder groupId(String groupId) {
+            this.groupId = groupId;
+            return this;
+        }
+
+        public LibraryBuilder artifactId(String artifactId) {
+            this.artifactId = artifactId;
+            return this;
+        }
+
+        public LibraryBuilder version(String version) {
+            this.version = version;
+            return this;
+        }
+
+        public LibraryBuilder sha256(byte[] sha256) {
+            this.sha256 = sha256;
+            return this;
+        }
+
+        public LibraryBuilder sha256(String sha256) {
+            return sha256(Base64.getDecoder().decode(sha256));
+        }
+
+        public Library build() {
+            if (version == null || sha256 == null) {
+                if (dependencyInfoLoader == null) {
+                    throw new IllegalStateException(
+                            "Provide a version and hash or provide a DependencyInfoLoader"
+                    );
+                }
+                DependencyInfo dependencyInfo = dependencyInfoLoader.byCombinedId(groupId, artifactId);
+                version = dependencyInfo.version();
+                sha256 = dependencyInfo.sha256();
+            }
+            return new Library(id, repository, groupId, artifactId, version, sha256);
+        }
+    }
+}

core/src/main/java/org/geysermc/floodgate/core/library/LibraryManager.java

@@ -0,0 +1,72 @@
+/*
+ * Copyright (c) 2019-2023 GeyserMC. http://geysermc.org
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * @author GeyserMC
+ * @link https://github.com/GeyserMC/Floodgate
+ */
+
+package org.geysermc.floodgate.core.library;
+
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.HashSet;
+import java.util.Set;
+import java.util.concurrent.CompletableFuture;
+import org.geysermc.floodgate.core.library.classloader.LibraryClassLoader;
+
+// Credits for the idea of downloading dependencies on runtime go to LuckPerms
+public final class LibraryManager {
+    private final LibraryClassLoader classLoader;
+    private final Path cacheDirectory;
+
+    private final Set<Library> toApply = new HashSet<>();
+
+    public LibraryManager(ClassLoader parent, Path cacheDirectory) {
+        this.classLoader = new LibraryClassLoader(parent);
+        this.cacheDirectory = cacheDirectory;
+    }
+
+    public LibraryManager addLibrary(Library library) {
+        toApply.add(library);
+        return this;
+    }
+
+    public void apply() {
+        CompletableFuture.allOf(
+                toApply.stream()
+                        .map(library -> CompletableFuture.runAsync(() -> loadLibrary(library)))
+                        .toArray(CompletableFuture[]::new)
+        ).join();
+    }
+
+    private void loadLibrary(Library library) {
+        var libPath = cacheDirectory.resolve(library.filePath());
+        if (classLoader.isLoaded(libPath)) {
+            return;
+        }
+
+        if (!Files.exists(libPath)) {
+            library.repository().downloadTo(library, libPath);
+        }
+
+        classLoader.addPath(libPath);
+    }
+}

core/src/main/java/org/geysermc/floodgate/core/library/Repository.java

@@ -0,0 +1,74 @@
+/*
+ * Copyright (c) 2019-2023 GeyserMC. http://geysermc.org
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * @author GeyserMC
+ * @link https://github.com/GeyserMC/Floodgate
+ */
+
+package org.geysermc.floodgate.core.library;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import org.geysermc.floodgate.core.util.HttpClient;
+import org.geysermc.floodgate.core.util.HttpClient.HttpResponse;
+
+public enum Repository {
+    MAVEN_CENTRAL("https://repo1.maven.org/maven2/");
+
+    private final String baseUrl;
+
+    Repository(String baseUrl) {
+        this.baseUrl = baseUrl;
+    }
+
+    private byte[] justDownload(Library library) {
+        try {
+            HttpResponse<byte[]> response = new HttpClient().getRawData(baseUrl + library.path());
+
+            if (!response.isCodeOk()) {
+                throw new RuntimeException(String.format(
+                        "Got an invalid response code (%s) while downloading library %s",
+                        response.getHttpCode(), library.id()
+                ));
+            }
+
+            return response.getResponse();
+        } catch (IOException exception) {
+            throw new IllegalStateException("Failed to download library " + library.id(), exception);
+        }
+    }
+
+    public byte[] download(Library library) {
+        byte[] data = justDownload(library);
+        library.validateChecksum(data);
+        return data;
+    }
+
+    public void downloadTo(Library library, Path location) {
+        try {
+            Files.createDirectories(location.getParent());
+            Files.write(location, download(library));
+        } catch (IOException exception) {
+            throw new IllegalStateException("Failed to save library!", exception);
+        }
+    }
+}

core/src/main/java/org/geysermc/floodgate/core/library/classloader/LibraryClassLoader.java

@@ -0,0 +1,64 @@
+/*
+ * Copyright (c) 2019-2023 GeyserMC. http://geysermc.org
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * @author GeyserMC
+ * @link https://github.com/GeyserMC/Floodgate
+ */
+
+package org.geysermc.floodgate.core.library.classloader;
+
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.net.URLClassLoader;
+import java.nio.file.Path;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.Set;
+
+public class LibraryClassLoader extends URLClassLoader {
+    private final Set<Path> loadedPaths = new HashSet<>();
+
+    public LibraryClassLoader(ClassLoader parent) {
+        super(new URL[0], parent);
+    }
+
+    @Override
+    public void addURL(URL url) {
+        super.addURL(url);
+    }
+
+    public void addPath(Path path) {
+        try {
+            addURL(path.toUri().toURL());
+            loadedPaths.add(path);
+        } catch (MalformedURLException e) {
+            throw new IllegalArgumentException(e);
+        }
+    }
+
+    public Set<Path> loadedPaths() {
+        return Collections.unmodifiableSet(loadedPaths);
+    }
+
+    public boolean isLoaded(Path path) {
+        return loadedPaths.contains(path);
+    }
+}

core/src/main/java/org/geysermc/floodgate/core/library/info/DependencyInfo.java

@@ -0,0 +1,38 @@
+/*
+ * Copyright (c) 2019-2023 GeyserMC. http://geysermc.org
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * @author GeyserMC
+ * @link https://github.com/GeyserMC/Floodgate
+ */
+
+package org.geysermc.floodgate.core.library.info;
+
+import java.util.Base64;
+
+public record DependencyInfo(String groupId, String artifactId, String version, byte[] sha256) {
+    public static DependencyInfo fromString(String string) {
+        var split = string.split(":");
+        if (split.length != 4) {
+            throw new IllegalArgumentException("Invalid LibraryInfo string: " + string);
+        }
+        return new DependencyInfo(split[0], split[1], split[2], Base64.getDecoder().decode(split[3]));
+    }
+}

core/src/main/java/org/geysermc/floodgate/core/library/info/DependencyInfoLoader.java

@@ -0,0 +1,58 @@
+/*
+ * Copyright (c) 2019-2023 GeyserMC. http://geysermc.org
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * @author GeyserMC
+ * @link https://github.com/GeyserMC/Floodgate
+ */
+
+package org.geysermc.floodgate.core.library.info;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.net.URL;
+import java.util.HashMap;
+import java.util.Map;
+
+public final class DependencyInfoLoader {
+    private final Map<String, DependencyInfo> infoMap = new HashMap<>();
+
+    private DependencyInfoLoader() {}
+
+    public static DependencyInfoLoader load(URL infoUrl) {
+        var loader = new DependencyInfoLoader();
+
+        try (var reader = new BufferedReader(new InputStreamReader(infoUrl.openStream()))) {
+            reader.lines().forEach(line -> {
+                var info = DependencyInfo.fromString(line);
+                loader.infoMap.put(info.groupId() + ":" + info.artifactId(), info);
+            });
+        } catch (IOException exception) {
+            throw new RuntimeException(exception);
+        }
+
+        return loader;
+    }
+
+    public DependencyInfo byCombinedId(String groupId, String artifactId) {
+        return infoMap.get(groupId + ":" + artifactId);
+    }
+}

core/src/main/java/org/geysermc/floodgate/core/util/HttpClient.java

@@ -30,9 +30,12 @@ import com.google.gson.JsonObject;
 import jakarta.inject.Inject;
 import jakarta.inject.Named;
 import jakarta.inject.Singleton;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
 import java.net.HttpURLConnection;
+import java.net.SocketTimeoutException;
 import java.net.URL;
 import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.ExecutorService;
@@ -46,8 +49,6 @@ import org.checkerframework.checker.nullness.qual.Nullable;
 @SuppressWarnings({"PMD.CloseResource", "PMD.PreserveStackTrace"})
 @Singleton
 public class HttpClient {
-    private static final String USER_AGENT = "GeyserMC/Floodgate";
-
     private final Gson gson = new Gson();
     @Inject
     @Named("commonPool")
@@ -86,7 +87,7 @@ public class HttpClient {
         try {
             connection.setRequestMethod("GET");
             connection.setUseCaches(false);
-            connection.setRequestProperty("User-Agent", USER_AGENT);
+            connection.setRequestProperty("User-Agent", Constants.USER_AGENT);
             connection.setConnectTimeout(3000);
             connection.setReadTimeout(5000);
         } catch (Exception exception) {
@@ -96,6 +97,26 @@ public class HttpClient {
         return connection;
     }
 
+    @NonNull
+    public HttpResponse<byte[]> getRawData(String urlString) throws IOException {
+        HttpURLConnection connection = request(urlString);
+
+        try (InputStream inputStream = connection.getInputStream()) {
+            int responseCode = connection.getResponseCode();
+
+            byte[] buffer = new byte[8196];
+            int len;
+            try (ByteArrayOutputStream outputStream = new ByteArrayOutputStream()) {
+                while ((len = inputStream.read(buffer, 0, buffer.length)) != -1) {
+                    outputStream.write(buffer, 0, len);
+                }
+                return new HttpResponse<>(responseCode, outputStream.toByteArray());
+            }
+        } catch (SocketTimeoutException | NullPointerException exception) {
+            return new HttpResponse<>(-1, null);
+        }
+    }
+
     @NonNull
     private <T> HttpResponse<T> readResponse(HttpURLConnection connection, Class<T> clazz) {
         InputStreamReader streamReader = createReader(connection);

core/src/main/java/org/geysermc/floodgate/core/util/Utils.java

@@ -28,21 +28,18 @@ package org.geysermc.floodgate.core.util;
 import io.netty.buffer.ByteBuf;
 import io.netty.channel.ChannelHandler;
 import io.netty.channel.ChannelPipeline;
-import java.io.BufferedReader;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
 import java.io.PrintWriter;
 import java.io.StringWriter;
-import java.lang.annotation.Annotation;
 import java.nio.charset.StandardCharsets;
+import java.util.Base64;
 import java.util.Locale;
 import java.util.Properties;
-import java.util.Set;
 import java.util.UUID;
 import java.util.concurrent.CompletableFuture;
 import java.util.regex.Pattern;
-import java.util.stream.Collectors;
 
 public class Utils {
     private static final Pattern NON_UNIQUE_PREFIX = Pattern.compile("^\\w{0,16}$");
@@ -138,41 +135,7 @@ public class Utils {
         return future;
     }
 
-    /**
+    public static String base64Encode(byte[] data) {
-     * Returns a set of all the classes that are annotated by a given annotation.
+        return Base64.getEncoder().encodeToString(data);
-     * Keep in mind that these are from a set of generated annotations generated
-     * at compile time by the annotation processor, meaning that arbitrary annotations
-     * cannot be passed into this method and expected to get a set of classes back.
-     *
-     * @param annotationClass the annotation class
-     * @return a set of all the classes annotated by the given annotation
-     */
-    public static Set<Class<?>> getGeneratedClassesForAnnotation(Class<? extends Annotation> annotationClass) {
-        return getGeneratedClassesForAnnotation(annotationClass.getName());
-    }
-
-    /**
-     * Returns a set of all the classes that are annotated by a given annotation.
-     * Keep in mind that these are from a set of generated annotations generated
-     * at compile time by the annotation processor, meaning that arbitrary annotations
-     * cannot be passed into this method and expected to have a set of classes
-     * returned back.
-     *
-     * @param input the fully qualified name of the annotation
-     * @return a set of all the classes annotated by the given annotation
-     */
-    public static Set<Class<?>> getGeneratedClassesForAnnotation(String input) {
-        try (InputStream annotatedClass = Utils.class.getClassLoader().getResourceAsStream(input);
-             BufferedReader reader = new BufferedReader(new InputStreamReader(annotatedClass))) {
-            return reader.lines().map(className -> {
-                try {
-                    return Class.forName(className);
-                } catch (ClassNotFoundException ex) {
-                    throw new RuntimeException("Failed to find class for annotation " + input, ex);
-                }
-            }).collect(Collectors.toSet());
-        } catch (IOException e) {
-            throw new RuntimeException(e);
-        }
     }
 }

core/src/main/resources/dependencyInfo.txt

@@ -0,0 +1,15 @@
+org.geysermc.configutils:configutils:1.0-SNAPSHOT:Xyh6oCOT1RwP5hw1gRM77M0mOJ86nNPf4J9Hs9PL4Ek=
+com.google.inject:guice:5.1.0:QTDlC/rEgJnIYPDZA7kYYMgaJJyQ84JF+P7Vj8gXvCY=
+com.nukkitx.fastutil:fastutil-short-object-maps:8.5.3:nTF5o2PCLMeBm8gaPeU4Q41FG2CNpmC9PxeJVHZot+U=
+com.nukkitx.fastutil:fastutil-int-object-maps:8.5.3:Z0iKxf9OmoIcQtmqV9Lo9Z39XSpBXKjL8tavAdVCKBY=
+org.java-websocket:Java-WebSocket:1.5.2:/4adGYqNxdAJZzkuGHrtqTuDO3zdO8zvs9f7WDQJi4U=
+cloud.commandframework:cloud-core:1.5.0:+hDJlLwU84P6sf0gkDq+xStIqAHhMXUCI+Wb8VsD1Zk=
+io.micronaut.sql:micronaut-jdbc-hikari:4.7.2:w2N1dH4vY/QjjQGsViMOwgVYxAnZNGgMm1doCa19wOA=
+io.micronaut.data:micronaut-data-hibernate-jpa:3.9.6:kFYugtQeXfLjqUCWrf3MFFDoUdYhXrPQmSh0pu2Zxzo=
+io.micronaut:micronaut-context:3.8.7:ir020Tq3UavnPZhXOUNHCl/XdGcVrOzhM1lU5NT6YEc=
+io.micronaut:micronaut-inject-java:3.8.7:V7Dxe3ctZ8+c7ZUDQ3Cwtsqc6S7l2SE8+qTVhvhTHQs=
+io.micronaut:micronaut-inject:3.8.7:6C+sHfQBffYWV/LnD+Vc5WhqRbkWZIgJXqxThca2tXE=
+org.yaml:snakeyaml:2.0:iAydiW5LdKBsVJwVyklkUBZdaQn6FdfmYr7o9qZtevo=
+org.bstats:bstats-base:3.0.1:vdyqrd84GBpK0MnfDnSXXMTauyzL9nkMSfAiMOrVU2Q=
+com.google.guava:guava:31.1-jre:pC7cnKt5Ljn+ObuU8/ymVe0Vf/h6iveOHWulsHxKAKs=
+com.h2database:h2:1.4.200:OtmsS2qunNnTrBxEdGXh7QYBm4UbiT3WqNdt222FvKY=

core/src/main/templates/org/geysermc/floodgate/core/util/Constants.java

@@ -39,6 +39,7 @@ public final class Constants {
     public static final String DATABASE_NAME_FORMAT = "^floodgate-[a-zA-Z0-9_]{0,16}-database.jar$";
 
 
+    public static final String USER_AGENT = "GeyserMC/Floodgate";
     private static final String API_BASE_URL = "s://api.geysermc.org";
     public static final String HEALTH_URL = "http" + API_BASE_URL + "/health";