Sponge use jar-in-jar loader

sponge/loader/build.gradle

@@ -0,0 +1,32 @@
+plugins {
+    id 'com.github.johnrengelman.shadow'
+}
+
+repositories {
+    maven { url 'https://repo.spongepowered.org/repository/maven-public/' }
+}
+
+dependencies {
+    compileOnly 'org.spongepowered:spongeapi:8.0.0'
+
+    implementation project(':api')
+    implementation project(':common:loader-utils')
+}
+
+processResources {
+    filesMatching('META-INF/sponge_plugins.json') {
+        expand 'pluginVersion': project.ext.fullVersion
+    }
+}
+
+shadowJar {
+    archiveFileName = "LuckPerms-Sponge-${project.ext.fullVersion}.jar"
+
+    from {
+        project(':sponge').tasks.shadowJar.archiveFile
+    }
+}
+
+artifacts {
+    archives shadowJar
+}

sponge/loader/src/main/java/me/lucko/luckperms/sponge/loader/SpongeLoaderPlugin.java

@@ -0,0 +1,75 @@
+/*
+ * This file is part of LuckPerms, licensed under the MIT License.
+ *
+ *  Copyright (c) lucko (Luck) <luck@lucko.me>
+ *  Copyright (c) contributors
+ *
+ *  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.
+ */
+
+package me.lucko.luckperms.sponge.loader;
+
+import com.google.inject.Inject;
+import com.google.inject.Injector;
+
+import me.lucko.luckperms.common.loader.JarInJarClassLoader;
+import me.lucko.luckperms.common.loader.LoaderBootstrap;
+
+import org.spongepowered.api.Server;
+import org.spongepowered.api.event.Listener;
+import org.spongepowered.api.event.Order;
+import org.spongepowered.api.event.lifecycle.ConstructPluginEvent;
+import org.spongepowered.api.event.lifecycle.StoppingEngineEvent;
+import org.spongepowered.plugin.builtin.jvm.Plugin;
+
+import java.util.function.Supplier;
+
+@Plugin("luckperms")
+public class SpongeLoaderPlugin implements Supplier<Injector> {
+    private static final String JAR_NAME = "luckperms-sponge.jarinjar";
+    private static final String BOOTSTRAP_CLASS = "me.lucko.luckperms.sponge.LPSpongeBootstrap";
+
+    private final LoaderBootstrap plugin;
+    private final Injector injector;
+
+    @Inject
+    public SpongeLoaderPlugin(Injector injector) {
+        this.injector = injector;
+
+        JarInJarClassLoader loader = new JarInJarClassLoader(getClass().getClassLoader(), JAR_NAME);
+        this.plugin = loader.instantiatePlugin(BOOTSTRAP_CLASS, Supplier.class, this);
+    }
+
+    @Override
+    public Injector get() {
+        return this.injector;
+    }
+
+    @Listener(order = Order.FIRST)
+    public void onEnable(ConstructPluginEvent event) {
+        this.plugin.onLoad();
+        this.plugin.onEnable();
+    }
+
+    @Listener
+    public void onDisable(StoppingEngineEvent<Server> event) {
+        this.plugin.onDisable();
+    }
+
+}

sponge/loader/src/main/resources/META-INF/sponge_plugins.json

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+{
+  "loader": {
+    "name": "java_plain",
+    "version": "1.0"
+  },
+  "license": "MIT",
+  "plugins": [
+    {
+      "id": "luckperms",
+      "name": "LuckPerms",
+      "version": "${pluginVersion}",
+      "entrypoint": "me.lucko.luckperms.sponge.loader.SpongeLoaderPlugin",
+      "description": "A permissions plugin",
+      "links": {
+        "homepage": "https://luckperms.net"
+      },
+      "contributors": [
+        {
+          "name": "Luck",
+          "description": "Developer"
+        }
+      ],
+      "dependencies": [
+        {
+          "id": "spongeapi",
+          "version": "8.0.0"
+        }
+      ]
+    }
+  ]
+}