Merge branch 'dev/1.1.0' into dev/2.0.0

# Conflicts:
#	build.gradle

api/build.gradle

@@ -89,19 +89,4 @@ publishing {
             artifact javadocJar
         }
     }
-
-    repositories {
-        maven {
-            credentials {
-                username System.getenv("NEXUS_USERNAME")
-                password System.getenv("NEXUS_PASSWORD")
-            }
-
-            name = 'velocity-nexus'
-            def base = 'https://nexus.velocitypowered.com/repository/velocity-artifacts'
-            def releasesRepoUrl = "$base-releases/"
-            def snapshotsRepoUrl = "$base-snapshots/"
-            url = version.endsWith('SNAPSHOT') ? snapshotsRepoUrl : releasesRepoUrl
-        }
-    }
 }

api/src/main/java/com/velocitypowered/api/network/ProtocolVersion.java

@@ -41,7 +41,7 @@ public enum ProtocolVersion {
   MINECRAFT_1_16_1(736, "1.16.1"),
   MINECRAFT_1_16_2(751, "1.16.2"),
   MINECRAFT_1_16_3(753, "1.16.3"),
-  MINECRAFT_1_16_4(754, 2, "1.16.4");
+  MINECRAFT_1_16_4(754, "1.16.4");
 
   private static final int SNAPSHOT_BIT = 30;
 

api/src/main/java/com/velocitypowered/api/proxy/messages/MinecraftChannelIdentifier.java

@@ -4,6 +4,7 @@ import com.google.common.base.Preconditions;
 import com.google.common.base.Strings;
 import java.util.Objects;
 import java.util.regex.Pattern;
+import net.kyori.minecraft.Key;
 import org.checkerframework.checker.nullness.qual.Nullable;
 
 /**
@@ -50,6 +51,35 @@ public final class MinecraftChannelIdentifier implements ChannelIdentifier {
     return new MinecraftChannelIdentifier(namespace, name);
   }
 
+  /**
+   * Creates an channel identifier from the specified Minecraft identifier.
+   *
+   * @param identifier the Minecraft identifier
+   * @return a new channel identifier
+   */
+  public static MinecraftChannelIdentifier from(String identifier) {
+    int colonPos = identifier.indexOf(':');
+    if (colonPos == -1) {
+      throw new IllegalArgumentException("Identifier does not contain a colon.");
+    }
+    if (colonPos + 1 == identifier.length()) {
+      throw new IllegalArgumentException("Identifier is empty.");
+    }
+    String namespace = identifier.substring(0, colonPos);
+    String name = identifier.substring(colonPos + 1);
+    return create(namespace, name);
+  }
+
+  /**
+   * Creates an channel identifier from the specified Minecraft identifier.
+   *
+   * @param key the Minecraft key to use
+   * @return a new channel identifier
+   */
+  public static MinecraftChannelIdentifier from(Key key) {
+    return create(key.namespace(), key.value());
+  }
+
   public String getNamespace() {
     return namespace;
   }
@@ -58,6 +88,10 @@ public final class MinecraftChannelIdentifier implements ChannelIdentifier {
     return name;
   }
 
+  public Key asKey() {
+    return Key.of(namespace, name);
+  }
+
   @Override
   public String toString() {
     return namespace + ":" + name + " (modern)";

api/src/main/java/com/velocitypowered/api/proxy/server/ServerPing.java

@@ -104,8 +104,9 @@ public final class ServerPing {
 
   /**
    * Returns a copy of this {@link ServerPing} instance as a builder so that it can be modified.
-   * It is guaranteed that {@code ping.asBuilder().ping().equals(ping)}: that is, if no other
+   * It is guaranteed that {@code ping.asBuilder().build().equals(ping)} is true: that is, if no
-   * changes are made to the returned builder, the built instance will equal the original instance.
+   * other changes are made to the returned builder, the built instance will equal the original
+   * instance.
    *
    * @return a copy of this instance as a {@link Builder}
    */

api/src/test/java/com/velocitypowered/api/proxy/messages/MinecraftChannelIdentifierTest.java

@@ -1,7 +1,9 @@
 package com.velocitypowered.api.proxy.messages;
 
 import static com.velocitypowered.api.proxy.messages.MinecraftChannelIdentifier.create;
+import static com.velocitypowered.api.proxy.messages.MinecraftChannelIdentifier.from;
 import static org.junit.jupiter.api.Assertions.assertAll;
+import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertThrows;
 
 import org.junit.jupiter.api.Test;
@@ -26,4 +28,24 @@ class MinecraftChannelIdentifierTest {
         () -> assertThrows(IllegalArgumentException.class, () -> create("minecraft", null))
     );
   }
+
+  @Test
+  void fromIdentifierIsCorrect() {
+    MinecraftChannelIdentifier expected = MinecraftChannelIdentifier.create("velocity", "test");
+    assertEquals(expected, MinecraftChannelIdentifier.from("velocity:test"));
+  }
+
+  @Test
+  void fromIdentifierThrowsOnBadValues() {
+    assertAll(
+        () -> assertThrows(IllegalArgumentException.class, () -> from("")),
+        () -> assertThrows(IllegalArgumentException.class, () -> from(":")),
+        () -> assertThrows(IllegalArgumentException.class, () -> from(":a")),
+        () -> assertThrows(IllegalArgumentException.class, () -> from("a:")),
+        () -> assertThrows(IllegalArgumentException.class, () -> from("hello:$$$$$$")),
+        () -> assertThrows(IllegalArgumentException.class, () -> from("hello::"))
+    );
+  }
+
+
 }

gradle/publish.gradle

@@ -8,7 +8,7 @@ publishing {
 
             name = 'velocity-nexus'
             def base = 'https://nexus.velocitypowered.com/repository/velocity-artifacts'
-            def releasesRepoUrl = "$base-releases/"
+            def releasesRepoUrl = "$base-release/"
             def snapshotsRepoUrl = "$base-snapshots/"
             url = version.endsWith('SNAPSHOT') ? snapshotsRepoUrl : releasesRepoUrl
         }

native/compile-linux.sh

@@ -1,5 +1,11 @@
 #!/bin/bash
 
+if [ ! "$CC" ]; then
+  # The libdeflate authors recommend that we build using GCC as it produces "slightly faster binaries":
+  # https://github.com/ebiggers/libdeflate#for-unix
+  export CC=gcc
+fi
+
 if [ ! -d libdeflate ]; then
   echo "Cloning libdeflate..."
   git clone https://github.com/ebiggers/libdeflate.git
@@ -10,10 +16,10 @@ cd libdeflate || exit
 CFLAGS="-fPIC -O2 -fomit-frame-pointer" make
 cd ..
 
-CFLAGS="-O2 -I$JAVA_HOME/include/ -I$JAVA_HOME/include/linux/ -fPIC -shared -Wl,-z,noexecstack -fomit-frame-pointer"
+CFLAGS="-O2 -I$JAVA_HOME/include/ -I$JAVA_HOME/include/linux/ -fPIC -shared -Wl,-z,noexecstack -Wall -Werror -fomit-frame-pointer"
 ARCH=$(uname -m)
 mkdir -p src/main/resources/linux_$ARCH
-gcc $CFLAGS -Ilibdeflate src/main/c/jni_util.c src/main/c/jni_zlib_deflate.c src/main/c/jni_zlib_inflate.c \
+$CC $CFLAGS -Ilibdeflate src/main/c/jni_util.c src/main/c/jni_zlib_deflate.c src/main/c/jni_zlib_inflate.c \
     libdeflate/libdeflate.a -o src/main/resources/linux_$ARCH/velocity-compress.so
-gcc $CFLAGS -I $MBEDTLS_ROOT/include -shared src/main/c/jni_util.c src/main/c/jni_cipher.c \
+$CC $CFLAGS -shared src/main/c/jni_util.c src/main/c/jni_cipher.c \
     -o src/main/resources/linux_$ARCH/velocity-cipher.so -lcrypto

native/src/main/c/jni_cipher.c

@@ -8,29 +8,32 @@ typedef unsigned char byte;
 
 JNIEXPORT jlong JNICALL
 Java_com_velocitypowered_natives_encryption_OpenSslCipherImpl_init(JNIEnv *env,
-    jobject obj,
+    jclass clazz,
     jbyteArray key,
     jboolean encrypt)
 {
+    jsize keyLen = (*env)->GetArrayLength(env, key);
+    if (keyLen != 16) {
+        throwException(env, "java/lang/IllegalArgumentException", "cipher not 16 bytes");
+        return 0;
+    }
+
     EVP_CIPHER_CTX *ctx = EVP_CIPHER_CTX_new();
     if (ctx == NULL) {
         throwException(env, "java/lang/OutOfMemoryError", "allocate cipher");
         return 0;
     }
 
-    jsize keyLen = (*env)->GetArrayLength(env, key);
+    // Since we know the array size is always bounded, we can just use Get<Primitive>ArrayRegion
-    jbyte* keyBytes = (*env)->GetPrimitiveArrayCritical(env, key, NULL);
+    // and save ourselves some error-checking headaches.
-    if (keyBytes == NULL) {
+    jbyte keyBytes[16];
-        EVP_CIPHER_CTX_free(ctx);
+    (*env)->GetByteArrayRegion(env, key, 0, keyLen, (jbyte*) keyBytes);
-        throwException(env, "java/lang/OutOfMemoryError", "cipher get key");
+    if ((*env)->ExceptionCheck(env)) {
         return 0;
     }
 
     int result = EVP_CipherInit(ctx, EVP_aes_128_cfb8(), (byte*) keyBytes, (byte*) keyBytes,
         encrypt);
-    // Release the key byte array now - we won't need it
-    (*env)->ReleasePrimitiveArrayCritical(env, key, keyBytes, 0);
-
     if (result != 1) {
         EVP_CIPHER_CTX_free(ctx);
         throwException(env, "java/security/GeneralSecurityException", "openssl initialize cipher");
@@ -41,7 +44,7 @@ Java_com_velocitypowered_natives_encryption_OpenSslCipherImpl_init(JNIEnv *env,
 
 JNIEXPORT void JNICALL
 Java_com_velocitypowered_natives_encryption_OpenSslCipherImpl_free(JNIEnv *env,
-    jobject obj,
+    jclass clazz,
     jlong ptr)
 {
     EVP_CIPHER_CTX_free((EVP_CIPHER_CTX *) ptr);
@@ -49,7 +52,7 @@ Java_com_velocitypowered_natives_encryption_OpenSslCipherImpl_free(JNIEnv *env,
 
 JNIEXPORT void JNICALL
 Java_com_velocitypowered_natives_encryption_OpenSslCipherImpl_process(JNIEnv *env,
-    jobject obj,
+    jclass clazz,
     jlong ptr,
     jlong source,
     jint len,

native/src/main/c/jni_zlib_deflate.c

@@ -7,7 +7,7 @@
 
 JNIEXPORT jlong JNICALL
 Java_com_velocitypowered_natives_compression_NativeZlibDeflate_init(JNIEnv *env,
-    jobject obj,
+    jclass clazz,
     jint level)
 {
     struct libdeflate_compressor *compressor = libdeflate_alloc_compressor(level);
@@ -21,7 +21,7 @@ Java_com_velocitypowered_natives_compression_NativeZlibDeflate_init(JNIEnv *env,
 
 JNIEXPORT void JNICALL
 Java_com_velocitypowered_natives_compression_NativeZlibDeflate_free(JNIEnv *env,
-    jobject obj,
+    jclass clazz,
     jlong ctx)
 {
     libdeflate_free_compressor((struct libdeflate_compressor *) ctx);
@@ -29,13 +29,12 @@ Java_com_velocitypowered_natives_compression_NativeZlibDeflate_free(JNIEnv *env,
 
 JNIEXPORT jboolean JNICALL
 Java_com_velocitypowered_natives_compression_NativeZlibDeflate_process(JNIEnv *env,
-    jobject obj,
+    jclass clazz,
     jlong ctx,
     jlong sourceAddress,
     jint sourceLength,
     jlong destinationAddress,
-    jint destinationLength,
+    jint destinationLength)
-    jboolean finish)
 {
     struct libdeflate_compressor *compressor = (struct libdeflate_compressor *) ctx;
     size_t produced = libdeflate_zlib_compress(compressor, (void *) sourceAddress, sourceLength,

native/src/main/c/jni_zlib_inflate.c

@@ -7,7 +7,7 @@
 
 JNIEXPORT jlong JNICALL
 Java_com_velocitypowered_natives_compression_NativeZlibInflate_init(JNIEnv *env,
-    jobject obj)
+    jclass clazz)
 {
     struct libdeflate_decompressor *decompress = libdeflate_alloc_decompressor();
     if (decompress == NULL) {
@@ -21,7 +21,7 @@ Java_com_velocitypowered_natives_compression_NativeZlibInflate_init(JNIEnv *env,
 
 JNIEXPORT void JNICALL
 Java_com_velocitypowered_natives_compression_NativeZlibInflate_free(JNIEnv *env,
-    jobject obj,
+    jclass clazz,
     jlong ctx)
 {
     libdeflate_free_decompressor((struct libdeflate_decompressor *) ctx);
@@ -29,7 +29,7 @@ Java_com_velocitypowered_natives_compression_NativeZlibInflate_free(JNIEnv *env,
 
 JNIEXPORT jboolean JNICALL
 Java_com_velocitypowered_natives_compression_NativeZlibInflate_process(JNIEnv *env,
-    jobject obj,
+    jclass clazz,
     jlong ctx,
     jlong sourceAddress,
     jint sourceLength,
@@ -53,5 +53,9 @@ Java_com_velocitypowered_natives_compression_NativeZlibInflate_process(JNIEnv *e
             // These cases are the same for us. We expect the full uncompressed size to be known.
             throwException(env, "java/util/zip/DataFormatException", "uncompressed size is inaccurate");
             return JNI_FALSE;
+        default:
+            // Unhandled case
+            throwException(env, "java/util/zip/DataFormatException", "unknown libdeflate return code");
+            return JNI_FALSE;
     }
 }

native/src/main/java/com/velocitypowered/natives/compression/LibdeflateVelocityCompressor.java

@@ -9,9 +9,7 @@ public class LibdeflateVelocityCompressor implements VelocityCompressor {
 
   public static final VelocityCompressorFactory FACTORY = LibdeflateVelocityCompressor::new;
 
-  private final NativeZlibInflate inflate = new NativeZlibInflate();
   private final long inflateCtx;
-  private final NativeZlibDeflate deflate = new NativeZlibDeflate();
   private final long deflateCtx;
   private boolean disposed = false;
 
@@ -21,8 +19,8 @@ public class LibdeflateVelocityCompressor implements VelocityCompressor {
       throw new IllegalArgumentException("Invalid compression level " + level);
     }
 
-    this.inflateCtx = inflate.init();
+    this.inflateCtx = NativeZlibInflate.init();
-    this.deflateCtx = deflate.init(correctedLevel);
+    this.deflateCtx = NativeZlibDeflate.init(correctedLevel);
   }
 
   @Override
@@ -38,7 +36,7 @@ public class LibdeflateVelocityCompressor implements VelocityCompressor {
     long sourceAddress = source.memoryAddress() + source.readerIndex();
     long destinationAddress = destination.memoryAddress() + destination.writerIndex();
 
-    inflate.process(inflateCtx, sourceAddress, source.readableBytes(), destinationAddress,
+    NativeZlibInflate.process(inflateCtx, sourceAddress, source.readableBytes(), destinationAddress,
         uncompressedSize);
     destination.writerIndex(destination.writerIndex() + uncompressedSize);
   }
@@ -51,7 +49,7 @@ public class LibdeflateVelocityCompressor implements VelocityCompressor {
       long sourceAddress = source.memoryAddress() + source.readerIndex();
       long destinationAddress = destination.memoryAddress() + destination.writerIndex();
 
-      int produced = deflate.process(deflateCtx, sourceAddress, source.readableBytes(),
+      int produced = NativeZlibDeflate.process(deflateCtx, sourceAddress, source.readableBytes(),
           destinationAddress, destination.writableBytes());
       if (produced > 0) {
         destination.writerIndex(destination.writerIndex() + produced);
@@ -70,8 +68,8 @@ public class LibdeflateVelocityCompressor implements VelocityCompressor {
   @Override
   public void close() {
     if (!disposed) {
-      inflate.free(inflateCtx);
+      NativeZlibInflate.free(inflateCtx);
-      deflate.free(deflateCtx);
+      NativeZlibDeflate.free(deflateCtx);
     }
     disposed = true;
   }

native/src/main/java/com/velocitypowered/natives/compression/NativeZlibDeflate.java

@@ -5,10 +5,10 @@ package com.velocitypowered.natives.compression;
  */
 class NativeZlibDeflate {
 
-  native long init(int level);
+  static native long init(int level);
 
-  native long free(long ctx);
+  static native long free(long ctx);
 
-  native int process(long ctx, long sourceAddress, int sourceLength, long destinationAddress,
+  static native int process(long ctx, long sourceAddress, int sourceLength, long destinationAddress,
       int destinationLength);
 }

native/src/main/java/com/velocitypowered/natives/compression/NativeZlibInflate.java

@@ -7,10 +7,10 @@ import java.util.zip.DataFormatException;
  */
 class NativeZlibInflate {
 
-  native long init();
+  static native long init();
 
-  native long free(long ctx);
+  static native long free(long ctx);
 
-  native boolean process(long ctx, long sourceAddress, int sourceLength, long destinationAddress,
+  static  native boolean process(long ctx, long sourceAddress, int sourceLength,
-      int destinationLength) throws DataFormatException;
+      long destinationAddress, int destinationLength) throws DataFormatException;
 }

native/src/main/java/com/velocitypowered/natives/encryption/NativeVelocityCipher.java

@@ -19,13 +19,11 @@ public class NativeVelocityCipher implements VelocityCipher {
       return new NativeVelocityCipher(false, key);
     }
   };
-  private static final OpenSslCipherImpl impl = new OpenSslCipherImpl();
-
   private final long ctx;
   private boolean disposed = false;
 
   private NativeVelocityCipher(boolean encrypt, SecretKey key) throws GeneralSecurityException {
-    this.ctx = impl.init(key.getEncoded(), encrypt);
+    this.ctx = OpenSslCipherImpl.init(key.getEncoded(), encrypt);
   }
 
   @Override
@@ -35,13 +33,13 @@ public class NativeVelocityCipher implements VelocityCipher {
     long base = source.memoryAddress() + source.readerIndex();
     int len = source.readableBytes();
 
-    impl.process(ctx, base, len, base);
+    OpenSslCipherImpl.process(ctx, base, len, base);
   }
 
   @Override
   public void close() {
     if (!disposed) {
-      impl.free(ctx);
+      OpenSslCipherImpl.free(ctx);
     }
     disposed = true;
   }

native/src/main/java/com/velocitypowered/natives/encryption/OpenSslCipherImpl.java

@@ -4,9 +4,9 @@ import java.security.GeneralSecurityException;
 
 class OpenSslCipherImpl {
 
-  native long init(byte[] key, boolean encrypt) throws GeneralSecurityException;
+  static native long init(byte[] key, boolean encrypt) throws GeneralSecurityException;
 
-  native void process(long ctx, long source, int len, long dest);
+  static native void process(long ctx, long source, int len, long dest);
 
-  native void free(long ptr);
+  static native void free(long ptr);
 }

native/src/test/java/com/velocitypowered/natives/encryption/VelocityCipherTest.java

@@ -2,6 +2,7 @@ package com.velocitypowered.natives.encryption;
 
 import static org.junit.jupiter.api.Assertions.assertTrue;
 import static org.junit.jupiter.api.Assertions.fail;
+import static org.junit.jupiter.api.condition.OS.LINUX;
 
 import com.velocitypowered.natives.util.Natives;
 import io.netty.buffer.ByteBuf;
@@ -13,6 +14,7 @@ import java.util.function.Supplier;
 import javax.crypto.spec.SecretKeySpec;
 import org.junit.jupiter.api.BeforeAll;
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.condition.EnabledOnOs;
 
 class VelocityCipherTest {
 
@@ -29,6 +31,7 @@ class VelocityCipherTest {
   }
 
   @Test
+  @EnabledOnOs({LINUX})
   void nativeIntegrityCheck() throws GeneralSecurityException {
     VelocityCipherFactory factory = Natives.cipher.get();
     if (factory == JavaVelocityCipher.FACTORY) {

proxy/src/main/java/com/velocitypowered/proxy/VelocityServer.java

@@ -415,8 +415,11 @@ public class VelocityServer implements ProxyServer, ForwardingAudience {
                   .toArray((IntFunction<CompletableFuture<Void>[]>) CompletableFuture[]::new));
 
           playersTeardownFuture.get(10, TimeUnit.SECONDS);
-        } catch (TimeoutException | ExecutionException e) {
+        } catch (TimeoutException e) {
           timedOut = true;
+        } catch (ExecutionException e) {
+          timedOut = true;
+          logger.error("Exception while tearing down player connections", e);
         }
 
         eventManager.fireShutdownEvent();

proxy/src/main/java/com/velocitypowered/proxy/command/builtin/VelocityCommand.java

@@ -3,19 +3,35 @@ package com.velocitypowered.proxy.command.builtin;
 import com.google.common.base.Joiner;
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableMap;
+
+import com.google.common.collect.ImmutableSet;
+import com.google.common.util.concurrent.MoreExecutors;
+import com.google.gson.JsonArray;
+import com.google.gson.JsonObject;
+import com.google.gson.JsonParseException;
+import com.google.gson.JsonSyntaxException;
 import com.velocitypowered.api.command.CommandSource;
 import com.velocitypowered.api.command.SimpleCommand;
 import com.velocitypowered.api.permission.Tristate;
 import com.velocitypowered.api.plugin.PluginContainer;
 import com.velocitypowered.api.plugin.PluginDescription;
 import com.velocitypowered.api.proxy.ProxyServer;
+import com.velocitypowered.api.proxy.server.RegisteredServer;
 import com.velocitypowered.api.util.ProxyVersion;
 import com.velocitypowered.proxy.VelocityServer;
+import com.velocitypowered.proxy.util.InformationUtils;
+
+import java.net.ConnectException;
+import java.net.UnknownHostException;
+import java.nio.charset.StandardCharsets;
 import java.util.Arrays;
+import java.util.Collection;
 import java.util.List;
 import java.util.Locale;
 import java.util.Map;
+import java.util.concurrent.ExecutionException;
 import java.util.stream.Collectors;
+
 import net.kyori.adventure.identity.Identity;
 import net.kyori.adventure.text.Component;
 import net.kyori.adventure.text.TextComponent;
@@ -25,6 +41,10 @@ import net.kyori.adventure.text.format.NamedTextColor;
 import net.kyori.adventure.text.format.TextDecoration;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
+import org.asynchttpclient.AsyncHttpClient;
+import org.asynchttpclient.BoundRequestBuilder;
+import org.asynchttpclient.ListenableFuture;
+import org.asynchttpclient.Response;
 import org.checkerframework.checker.nullness.qual.NonNull;
 
 public class VelocityCommand implements SimpleCommand {
@@ -52,6 +72,7 @@ public class VelocityCommand implements SimpleCommand {
         .put("version", new Info(server))
         .put("plugins", new Plugins(server))
         .put("reload", new Reload(server))
+        .put("dump", new Dump(server))
         .build();
   }
 
@@ -289,4 +310,140 @@ public class VelocityCommand implements SimpleCommand {
       return source.getPermissionValue("velocity.command.plugins") == Tristate.TRUE;
     }
   }
+
+  private static class Dump implements SubCommand {
+
+    private static final Logger logger = LogManager.getLogger(Dump.class);
+    private final ProxyServer server;
+
+    private Dump(ProxyServer server) {
+      this.server = server;
+    }
+
+    @Override
+    public void execute(CommandSource source, String @NonNull [] args) {
+      if (args.length != 0) {
+        source.sendMessage(Identity.nil(), Component.text("/velocity dump", NamedTextColor.RED));
+        return;
+      }
+
+      Collection<RegisteredServer> allServers = ImmutableSet.copyOf(server.getAllServers());
+      JsonObject servers = new JsonObject();
+      for (RegisteredServer iter : allServers) {
+        servers.add(iter.getServerInfo().getName(),
+                InformationUtils.collectServerInfo(iter));
+      }
+      JsonArray connectOrder = new JsonArray();
+      List<String> attemptedConnectionOrder = ImmutableList.copyOf(
+              server.getConfiguration().getAttemptConnectionOrder());
+      for (int i = 0; i < attemptedConnectionOrder.size(); i++) {
+        connectOrder.add(attemptedConnectionOrder.get(i));
+      }
+
+      JsonObject proxyConfig = InformationUtils.collectProxyConfig(server.getConfiguration());
+      proxyConfig.add("servers", servers);
+      proxyConfig.add("connectOrder", connectOrder);
+      proxyConfig.add("forcedHosts",
+              InformationUtils.collectForcedHosts(server.getConfiguration()));
+
+      JsonObject dump = new JsonObject();
+      dump.add("versionInfo", InformationUtils.collectProxyInfo(server.getVersion()));
+      dump.add("platform", InformationUtils.collectEnvironmentInfo());
+      dump.add("config", proxyConfig);
+      dump.add("plugins", InformationUtils.collectPluginInfo(server));
+
+      source.sendMessage(Component.text().content("Uploading gathered information...").build());
+      AsyncHttpClient httpClient = ((VelocityServer) server).getAsyncHttpClient();
+
+      BoundRequestBuilder request =
+              httpClient.preparePost("https://dump.velocitypowered.com/documents");
+      request.setHeader("Content-Type", "text/plain");
+      request.addHeader("User-Agent", server.getVersion().getName() + "/"
+              + server.getVersion().getVersion());
+      request.setBody(
+              InformationUtils.toHumanReadableString(dump).getBytes(StandardCharsets.UTF_8));
+
+      ListenableFuture<Response> future = request.execute();
+      future.addListener(() -> {
+        try {
+          Response response = future.get();
+          if (response.getStatusCode() != 200) {
+            source.sendMessage(Component.text()
+                    .content("An error occurred while communicating with the Velocity servers. "
+                            + "The servers may be temporarily unavailable or there is an issue "
+                            + "with your network settings. You can find more information in the "
+                            + "log or console of your Velocity server.")
+                    .color(NamedTextColor.RED).build());
+            logger.error("Invalid status code while POST-ing Velocity dump: "
+                    + response.getStatusCode());
+            logger.error("Headers: \n--------------BEGIN HEADERS--------------\n"
+                    + response.getHeaders().toString()
+                    + "\n---------------END HEADERS---------------");
+            return;
+          }
+          JsonObject key = InformationUtils.parseString(
+                  response.getResponseBody(StandardCharsets.UTF_8));
+          if (!key.has("key")) {
+            throw new JsonSyntaxException("Missing Dump-Url-response");
+          }
+          String url = "https://dump.velocitypowered.com/"
+                  + key.get("key").getAsString() + ".json";
+          source.sendMessage(Component.text()
+                  .content("Created an anonymised report containing useful information about "
+                          + "this proxy. If a developer requested it, you may share the "
+                          + "following link with them:")
+                  .append(Component.newline())
+                  .append(Component.text(">> " + url)
+                          .color(NamedTextColor.GREEN)
+                          .clickEvent(ClickEvent.openUrl(url)))
+                 .append(Component.newline())
+                 .append(Component.text("Note: This link is only valid for a few days")
+                          .color(NamedTextColor.GRAY)
+                 ).build());
+        } catch (InterruptedException e) {
+          source.sendMessage(Component.text()
+                  .content("Could not complete the request, the command was interrupted."
+                          + "Please refer to the proxy-log or console for more information.")
+                  .color(NamedTextColor.RED).build());
+          logger.error("Failed to complete dump command, "
+                  + "the executor was interrupted: " + e.getMessage());
+          e.printStackTrace();
+        } catch (ExecutionException e) {
+          TextComponent.Builder message = Component.text()
+                  .content("An error occurred while attempting to upload the gathered "
+                          + "information to the Velocity servers.")
+                  .append(Component.newline())
+                  .color(NamedTextColor.RED);
+          if (e.getCause() instanceof UnknownHostException
+              || e.getCause() instanceof ConnectException) {
+            message.append(Component.text(
+                    "Likely cause: Invalid system DNS settings or no internet connection"));
+          }
+          source.sendMessage(message
+                  .append(Component.newline()
+                  .append(Component.text(
+                          "Error details can be found in the proxy log / console"))
+                  ).build());
+
+          logger.error("Failed to complete dump command, "
+                  + "the executor encountered an Exception: " + e.getCause().getMessage());
+          e.getCause().printStackTrace();
+        } catch (JsonParseException e) {
+          source.sendMessage(Component.text()
+                  .content("An error occurred on the Velocity-servers and the dump could not "
+                          + "be completed. Please contact the Velocity staff about this problem. "
+                          + "If you do, provide the details about this error from the Velocity "
+                          + "console or server log.")
+                  .color(NamedTextColor.RED).build());
+          logger.error("Invalid response from the Velocity servers: " + e.getMessage());
+          e.printStackTrace();
+        }
+      }, MoreExecutors.directExecutor());
+    }
+
+    @Override
+    public boolean hasPermission(final CommandSource source, final String @NonNull [] args) {
+      return source.getPermissionValue("velocity.command.plugins") == Tristate.TRUE;
+    }
+  }
 }

proxy/src/main/java/com/velocitypowered/proxy/config/VelocityConfiguration.java

@@ -7,6 +7,7 @@ import com.electronwill.nightconfig.toml.TomlFormat;
 import com.google.common.base.MoreObjects;
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableMap;
+import com.google.gson.annotations.Expose;
 import com.velocitypowered.api.proxy.config.ProxyConfig;
 import com.velocitypowered.api.util.Favicon;
 import com.velocitypowered.proxy.util.AddressUtil;
@@ -42,20 +43,20 @@ public class VelocityConfiguration implements ProxyConfig {
 
   private static final Logger logger = LogManager.getLogger(VelocityConfiguration.class);
 
-  private String bind = "0.0.0.0:25577";
+  @Expose private String bind = "0.0.0.0:25577";
-  private String motd = "&3A Velocity Server";
+  @Expose private String motd = "&3A Velocity Server";
-  private int showMaxPlayers = 500;
+  @Expose private int showMaxPlayers = 500;
-  private boolean onlineMode = true;
+  @Expose private boolean onlineMode = true;
-  private boolean preventClientProxyConnections = false;
+  @Expose private boolean preventClientProxyConnections = false;
-  private PlayerInfoForwarding playerInfoForwardingMode = PlayerInfoForwarding.NONE;
+  @Expose private PlayerInfoForwarding playerInfoForwardingMode = PlayerInfoForwarding.NONE;
   private byte[] forwardingSecret = generateRandomString(12).getBytes(StandardCharsets.UTF_8);
-  private boolean announceForge = false;
+  @Expose private boolean announceForge = false;
-  private boolean onlineModeKickExistingPlayers = false;
+  @Expose private boolean onlineModeKickExistingPlayers = false;
-  private PingPassthroughMode pingPassthrough = PingPassthroughMode.DISABLED;
+  @Expose private PingPassthroughMode pingPassthrough = PingPassthroughMode.DISABLED;
   private final Servers servers;
   private final ForcedHosts forcedHosts;
-  private final Advanced advanced;
+  @Expose private final Advanced advanced;
-  private final Query query;
+  @Expose private final Query query;
   private final Metrics metrics;
   private final Messages messages;
   private net.kyori.adventure.text.@MonotonicNonNull Component motdAsComponent;
@@ -612,18 +613,18 @@ public class VelocityConfiguration implements ProxyConfig {
 
   private static class Advanced {
 
-    private int compressionThreshold = 256;
+    @Expose private int compressionThreshold = 256;
-    private int compressionLevel = -1;
+    @Expose private int compressionLevel = -1;
-    private int loginRatelimit = 3000;
+    @Expose private int loginRatelimit = 3000;
-    private int connectionTimeout = 5000;
+    @Expose private int connectionTimeout = 5000;
-    private int readTimeout = 30000;
+    @Expose private int readTimeout = 30000;
-    private boolean proxyProtocol = false;
+    @Expose private boolean proxyProtocol = false;
-    private boolean tcpFastOpen = false;
+    @Expose private boolean tcpFastOpen = false;
-    private boolean bungeePluginMessageChannel = true;
+    @Expose private boolean bungeePluginMessageChannel = true;
-    private boolean showPingRequests = false;
+    @Expose private boolean showPingRequests = false;
-    private boolean failoverOnUnexpectedServerDisconnect = true;
+    @Expose private boolean failoverOnUnexpectedServerDisconnect = true;
-    private boolean announceProxyCommands = true;
+    @Expose private boolean announceProxyCommands = true;
-    private boolean logCommandExecutions = false;
+    @Expose private boolean logCommandExecutions = false;
 
     private Advanced() {
     }
@@ -715,10 +716,10 @@ public class VelocityConfiguration implements ProxyConfig {
 
   private static class Query {
 
-    private boolean queryEnabled = false;
+    @Expose private boolean queryEnabled = false;
-    private int queryPort = 25577;
+    @Expose private int queryPort = 25577;
-    private String queryMap = "Velocity";
+    @Expose private String queryMap = "Velocity";
-    private boolean showPlugins = false;
+    @Expose private boolean showPlugins = false;
 
     private Query() {
     }

proxy/src/main/java/com/velocitypowered/proxy/connection/backend/BackendPlaySessionHandler.java

@@ -149,7 +149,11 @@ public class BackendPlaySessionHandler implements MinecraftSessionHandler {
                 Unpooled.wrappedBuffer(copy));
             playerConnection.write(copied);
           }
-        }, playerConnection.eventLoop());
+        }, playerConnection.eventLoop())
+        .exceptionally((ex) -> {
+          logger.error("Exception while handling plugin message {}", packet, ex);
+          return null;
+        });
     return true;
   }
 
@@ -186,7 +190,11 @@ public class BackendPlaySessionHandler implements MinecraftSessionHandler {
 
     server.getEventManager().fire(
         new PlayerAvailableCommandsEvent(serverConn.getPlayer(), rootNode))
-        .thenAcceptAsync(event -> playerConnection.write(commands), playerConnection.eventLoop());
+        .thenAcceptAsync(event -> playerConnection.write(commands), playerConnection.eventLoop())
+        .exceptionally((ex) -> {
+          logger.error("Exception while handling available commands for {}", playerConnection, ex);
+          return null;
+        });
     return true;
   }
 

proxy/src/main/java/com/velocitypowered/proxy/connection/backend/BungeeCordMessageResponder.java

@@ -30,7 +30,7 @@ import net.kyori.adventure.text.serializer.legacy.LegacyComponentSerializer;
 @SuppressFBWarnings(value = "OS_OPEN_STREAM", justification = "Most methods in this class open "
     + "instances of ByteBufDataOutput backed by heap-allocated ByteBufs. Closing them does "
     + "nothing.")
-class BungeeCordMessageResponder {
+public class BungeeCordMessageResponder {
 
   private static final MinecraftChannelIdentifier MODERN_CHANNEL = MinecraftChannelIdentifier
       .create("bungeecord", "main");
@@ -45,6 +45,11 @@ class BungeeCordMessageResponder {
     this.player = player;
   }
 
+  public static boolean isBungeeCordMessage(PluginMessage message) {
+    return MODERN_CHANNEL.getId().equals(message.getChannel()) && !LEGACY_CHANNEL.getId()
+        .equals(message.getChannel());
+  }
+
   private void processConnect(ByteBufDataInput in) {
     String serverName = in.readUTF();
     proxy.getServer(serverName).ifPresent(server -> player.createConnectionRequest(server)
@@ -332,8 +337,7 @@ class BungeeCordMessageResponder {
       return false;
     }
 
-    if (!MODERN_CHANNEL.getId().equals(message.getChannel()) && !LEGACY_CHANNEL.getId()
+    if (!isBungeeCordMessage(message)) {
-        .equals(message.getChannel())) {
       return false;
     }
 

proxy/src/main/java/com/velocitypowered/proxy/connection/client/ClientPlaySessionHandler.java

@@ -16,6 +16,7 @@ import com.velocitypowered.proxy.VelocityServer;
 import com.velocitypowered.proxy.connection.MinecraftConnection;
 import com.velocitypowered.proxy.connection.MinecraftSessionHandler;
 import com.velocitypowered.proxy.connection.backend.BackendConnectionPhases;
+import com.velocitypowered.proxy.connection.backend.BungeeCordMessageResponder;
 import com.velocitypowered.proxy.connection.backend.VelocityServerConnection;
 import com.velocitypowered.proxy.protocol.MinecraftPacket;
 import com.velocitypowered.proxy.protocol.StateRegistry;
@@ -157,7 +158,11 @@ public class ClientPlaySessionHandler implements MinecraftSessionHandler {
                 smc.write(packet);
               }
             }
-          }, smc.eventLoop());
+          }, smc.eventLoop())
+          .exceptionally((ex) -> {
+            logger.error("Exception while handling player chat for {}", player, ex);
+            return null;
+          });
     }
     return true;
   }
@@ -190,6 +195,8 @@ public class ClientPlaySessionHandler implements MinecraftSessionHandler {
       } else if (PluginMessageUtil.isMcBrand(packet)) {
         backendConn.write(PluginMessageUtil
             .rewriteMinecraftBrand(packet, server.getVersion(), player.getProtocolVersion()));
+      } else if (BungeeCordMessageResponder.isBungeeCordMessage(packet)) {
+        return true;
       } else {
         if (serverConn.getPhase() == BackendConnectionPhases.IN_TRANSITION) {
           // We must bypass the currently-connected server when forwarding Forge packets.
@@ -225,7 +232,12 @@ public class ClientPlaySessionHandler implements MinecraftSessionHandler {
                       Unpooled.wrappedBuffer(copy));
                   backendConn.write(message);
                 }
-              }, backendConn.eventLoop());
+              }, backendConn.eventLoop())
+                  .exceptionally((ex) -> {
+                    logger.error("Exception while handling plugin message packet for {}",
+                        player, ex);
+                    return null;
+                  });
             }
           }
         }
@@ -423,7 +435,12 @@ public class ClientPlaySessionHandler implements MinecraftSessionHandler {
             resp.getOffers().addAll(offers);
             player.getConnection().write(resp);
           }
-        }, player.getConnection().eventLoop());
+        }, player.getConnection().eventLoop())
+        .exceptionally((ex) -> {
+          logger.error("Exception while handling command tab completion for player {} executing {}",
+              player, command, ex);
+          return null;
+        });
     return true; // Sorry, handler; we're just gonna have to lie to you here.
   }
 
@@ -475,7 +492,13 @@ public class ClientPlaySessionHandler implements MinecraftSessionHandler {
                 player.getUsername(),
                 command, e);
           }
-        }, player.getConnection().eventLoop());
+        }, player.getConnection().eventLoop())
+        .exceptionally((ex) -> {
+          logger.error(
+              "Exception while finishing command tab completion, with request {} and response {}",
+              request, response, ex);
+          return null;
+        });
   }
 
   private void finishRegularTabComplete(TabCompleteRequest request, TabCompleteResponse response) {
@@ -490,7 +513,13 @@ public class ClientPlaySessionHandler implements MinecraftSessionHandler {
             response.getOffers().add(new Offer(s));
           }
           player.getConnection().write(response);
-        }, player.getConnection().eventLoop());
+        }, player.getConnection().eventLoop())
+        .exceptionally((ex) -> {
+          logger.error(
+              "Exception while finishing regular tab completion, with request {} and response{}",
+              request, response, ex);
+          return null;
+        });
   }
 
   private CompletableFuture<Void> processCommandExecuteResult(String originalCommand,

proxy/src/main/java/com/velocitypowered/proxy/connection/client/ConnectedPlayer.java

@@ -637,7 +637,13 @@ public class ConnectedPlayer implements MinecraftConnectionAssociation, Player {
     }
 
     DisconnectEvent event = new DisconnectEvent(this, status);
-    server.getEventManager().fire(event).thenRun(() -> this.teardownFuture.complete(null));
+    server.getEventManager().fire(event).whenComplete((val, ex) -> {
+      if (ex == null) {
+        this.teardownFuture.complete(null);
+      } else {
+        this.teardownFuture.completeExceptionally(ex);
+      }
+    });
   }
 
   public CompletableFuture<Void> getTeardownFuture() {

proxy/src/main/java/com/velocitypowered/proxy/connection/client/InitialConnectSessionHandler.java

@@ -1,6 +1,7 @@
 package com.velocitypowered.proxy.connection.client;
 
 import com.velocitypowered.proxy.connection.MinecraftSessionHandler;
+import com.velocitypowered.proxy.connection.backend.BungeeCordMessageResponder;
 import com.velocitypowered.proxy.connection.backend.VelocityServerConnection;
 import com.velocitypowered.proxy.protocol.packet.PluginMessage;
 import com.velocitypowered.proxy.protocol.util.PluginMessageUtil;
@@ -25,6 +26,8 @@ public class InitialConnectSessionHandler implements MinecraftSessionHandler {
         player.getKnownChannels().addAll(PluginMessageUtil.getChannels(packet));
       } else if (PluginMessageUtil.isUnregister(packet)) {
         player.getKnownChannels().removeAll(PluginMessageUtil.getChannels(packet));
+      } else if (BungeeCordMessageResponder.isBungeeCordMessage(packet)) {
+        return true;
       }
       serverConn.ensureConnected().write(packet.retain());
     }

proxy/src/main/java/com/velocitypowered/proxy/connection/client/LoginSessionHandler.java

@@ -183,7 +183,11 @@ public class LoginSessionHandler implements MinecraftSessionHandler {
           } else {
             initializePlayer(GameProfile.forOfflinePlayer(login.getUsername()), false);
           }
-        }, mcConnection.eventLoop());
+        }, mcConnection.eventLoop())
+        .exceptionally((ex) -> {
+          logger.error("Exception in pre-login stage", ex);
+          return null;
+        });
   }
 
   private EncryptionRequest generateEncryptionRequest() {
@@ -202,6 +206,7 @@ public class LoginSessionHandler implements MinecraftSessionHandler {
         server.getConfiguration().getPlayerInfoForwardingMode());
     GameProfileRequestEvent profileRequestEvent = new GameProfileRequestEvent(inbound, profile,
         onlineMode);
+    final GameProfile finalProfile = profile;
 
     server.getEventManager().fire(profileRequestEvent).thenCompose(profileEvent -> {
       if (mcConnection.isClosed()) {
@@ -229,6 +234,9 @@ public class LoginSessionHandler implements MinecraftSessionHandler {
               completeLoginProtocolPhaseAndInitialize(player);
             }
           }, mcConnection.eventLoop());
+    }).exceptionally((ex) -> {
+      logger.error("Exception during connection of {}", finalProfile, ex);
+      return null;
     });  
   }
 
@@ -274,7 +282,11 @@ public class LoginSessionHandler implements MinecraftSessionHandler {
             server.getEventManager().fire(new PostLoginEvent(player))
                 .thenRun(() -> connectToInitialServer(player));
           }
-        }, mcConnection.eventLoop());
+        }, mcConnection.eventLoop())
+        .exceptionally((ex) -> {
+          logger.error("Exception while completing login initialisation phase for {}", player, ex);
+          return null;
+        });
   }
 
   private void connectToInitialServer(ConnectedPlayer player) {
@@ -291,7 +303,11 @@ public class LoginSessionHandler implements MinecraftSessionHandler {
             return;
           }
           player.createConnectionRequest(toTry.get()).fireAndForget();
-        }, mcConnection.eventLoop());
+        }, mcConnection.eventLoop())
+        .exceptionally((ex) -> {
+          logger.error("Exception while connecting {} to initial server", player, ex);
+          return null;
+        });
   }
 
   @Override

proxy/src/main/java/com/velocitypowered/proxy/connection/client/StatusSessionHandler.java

@@ -120,6 +120,10 @@ public class StatusSessionHandler implements MinecraftSessionHandler {
               continue;
             }
 
+            if (response.getDescriptionComponent() == null) {
+              continue;
+            }
+
             return new ServerPing(
                 fallback.getVersion(),
                 fallback.getPlayers().orElse(null),
@@ -163,7 +167,11 @@ public class StatusSessionHandler implements MinecraftSessionHandler {
         .thenCompose(ping -> server.getEventManager().fire(new ProxyPingEvent(inbound, ping)))
         .thenAcceptAsync(event -> connection.closeWith(
             LegacyDisconnect.fromServerPing(event.getPing(), packet.getVersion())),
-            connection.eventLoop());
+            connection.eventLoop())
+        .exceptionally((ex) -> {
+          logger.error("Exception while handling legacy ping {}", packet, ex);
+          return null;
+        });
     return true;
   }
 
@@ -189,7 +197,11 @@ public class StatusSessionHandler implements MinecraftSessionHandler {
                   .toJson(event.getPing(), json);
               connection.write(new StatusResponse(json));
             },
-            connection.eventLoop());
+            connection.eventLoop())
+        .exceptionally((ex) -> {
+          logger.error("Exception while handling status request {}", packet, ex);
+          return null;
+        });
     return true;
   }
 

proxy/src/main/java/com/velocitypowered/proxy/plugin/VelocityEventManager.java

@@ -113,12 +113,10 @@ public class VelocityEventManager implements EventManager {
       return CompletableFuture.completedFuture(event);
     }
 
-    CompletableFuture<E> eventFuture = new CompletableFuture<>();
+    return CompletableFuture.supplyAsync(() -> {
-    service.execute(() -> {
       fireEvent(event);
-      eventFuture.complete(event);
+      return event;
-    });
+    }, service);
-    return eventFuture;
   }
 
   @Override

proxy/src/main/java/com/velocitypowered/proxy/protocol/netty/GS4QueryHandler.java

@@ -30,6 +30,7 @@ import java.util.Optional;
 import java.util.concurrent.TimeUnit;
 import java.util.stream.Collectors;
 import net.kyori.adventure.text.serializer.plain.PlainComponentSerializer;
+import org.apache.logging.log4j.LogManager;
 
 public class GS4QueryHandler extends SimpleChannelInboundHandler<DatagramPacket> {
 
@@ -163,7 +164,12 @@ public class GS4QueryHandler extends SimpleChannelInboundHandler<DatagramPacket>
               // Send the response
               DatagramPacket responsePacket = new DatagramPacket(queryResponse, msg.sender());
               ctx.writeAndFlush(responsePacket, ctx.voidPromise());
-            }, ctx.channel().eventLoop());
+            }, ctx.channel().eventLoop())
+            .exceptionally((ex) -> {
+              LogManager.getLogger(getClass()).error(
+                  "Exception while writing GS4 response for query from {}", senderAddress, ex);
+              return null;
+            });
         break;
       }
       default:

proxy/src/main/java/com/velocitypowered/proxy/util/InformationUtils.java

@@ -0,0 +1,240 @@
+package com.velocitypowered.proxy.util;
+
+import com.google.common.collect.ImmutableList;
+import com.google.common.collect.ImmutableMap;
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
+import com.google.gson.JsonArray;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonObject;
+import com.google.gson.JsonParser;
+import com.velocitypowered.api.plugin.PluginContainer;
+import com.velocitypowered.api.plugin.PluginDescription;
+import com.velocitypowered.api.plugin.meta.PluginDependency;
+import com.velocitypowered.api.proxy.ProxyServer;
+import com.velocitypowered.api.proxy.config.ProxyConfig;
+import com.velocitypowered.api.proxy.server.RegisteredServer;
+import com.velocitypowered.api.util.ProxyVersion;
+
+import java.net.Inet4Address;
+import java.net.Inet6Address;
+import java.net.InetAddress;
+import java.net.InetSocketAddress;
+import java.util.List;
+import java.util.Map;
+
+public enum InformationUtils {
+  ;
+
+  /**
+   * Retrieves a {@link JsonArray} containing basic information about all
+   * running plugins on the {@link ProxyServer} instance.
+   *
+   * @param proxy the proxy instance to retrieve from
+   * @return {@link JsonArray} containing zero or more {@link JsonObject}
+   */
+  public static JsonArray collectPluginInfo(ProxyServer proxy) {
+    List<PluginContainer> allPlugins = ImmutableList.copyOf(
+            proxy.getPluginManager().getPlugins());
+    JsonArray plugins = new JsonArray();
+
+    for (PluginContainer plugin : allPlugins) {
+      PluginDescription desc = plugin.getDescription();
+      JsonObject current = new JsonObject();
+      current.addProperty("id", desc.getId());
+      if (desc.getName().isPresent()) {
+        current.addProperty("name", desc.getName().get());
+      }
+      if (desc.getVersion().isPresent()) {
+        current.addProperty("version", desc.getVersion().get());
+      }
+      if (!desc.getAuthors().isEmpty()) {
+        JsonArray authorsArray = new JsonArray();
+        for (String author : desc.getAuthors()) {
+          authorsArray.add(author);
+        }
+        current.add("authors", authorsArray);
+      }
+      if (desc.getDescription().isPresent()) {
+        current.addProperty("description", desc.getDescription().get());
+      }
+      if (desc.getUrl().isPresent()) {
+        current.addProperty("url", desc.getUrl().get());
+      }
+      if (!desc.getDependencies().isEmpty()) {
+        JsonArray dependencies = new JsonArray();
+        for (PluginDependency dependency : desc.getDependencies()) {
+          dependencies.add(dependency.getId());
+        }
+        current.add("dependencies", dependencies);
+      }
+      plugins.add(current);
+    }
+    return plugins;
+  }
+
+  /**
+   * Creates a {@link JsonObject} containing information about the
+   * current environment the project is run under.
+   *
+   * @return {@link JsonObject} containing environment info
+   */
+  public static JsonObject collectEnvironmentInfo() {
+    JsonObject envInfo = new JsonObject();
+    envInfo.addProperty("operatingSystemType", System.getProperty("os.name"));
+    envInfo.addProperty("operatingSystemVersion", System.getProperty("os.version"));
+    envInfo.addProperty("operatingSystemArchitecture", System.getProperty("os.arch"));
+    envInfo.addProperty("javaVersion", System.getProperty("java.version"));
+    envInfo.addProperty("javaVendor", System.getProperty("java.vendor"));
+    return envInfo;
+  }
+
+  /**
+   * Creates a {@link JsonObject} containing information about the
+   * forced hosts of the {@link ProxyConfig} instance.
+   *
+   * @return {@link JsonArray} containing forced hosts
+   */
+  public static JsonObject collectForcedHosts(ProxyConfig config) {
+    JsonObject forcedHosts = new JsonObject();
+    Map<String, List<String>> allForcedHosts = ImmutableMap.copyOf(
+            config.getForcedHosts());
+    for (Map.Entry<String, List<String>> entry : allForcedHosts.entrySet()) {
+      JsonArray host = new JsonArray();
+      for (int i = 0; i < entry.getValue().size(); i++) {
+        host.add(entry.getValue().get(i));
+      }
+      forcedHosts.add(entry.getKey(), host);
+    }
+    return forcedHosts;
+  }
+
+  /**
+   * Anonymises or redacts a given {@link InetAddress}
+   * public address bits.
+   *
+   * @param address The address to redact
+   * @return {@link String} address with public parts redacted
+   */
+  public static String anonymizeInetAddress(InetAddress address) {
+    if (address instanceof Inet4Address) {
+      Inet4Address v4 = (Inet4Address) address;
+      if (v4.isAnyLocalAddress() || v4.isLoopbackAddress()
+              || v4.isLinkLocalAddress()
+              || v4.isSiteLocalAddress()) {
+        return address.getHostAddress();
+      } else {
+        byte[] addr = v4.getAddress();
+        return (addr[0] & 0xff) + "." + (addr[1] & 0xff) + ".XXX.XXX";
+      }
+    } else if (address instanceof Inet6Address) {
+      Inet6Address v6 = (Inet6Address) address;
+      if (v6.isAnyLocalAddress() || v6.isLoopbackAddress()
+              || v6.isSiteLocalAddress()
+              || v6.isSiteLocalAddress()) {
+        return address.getHostAddress();
+      } else {
+        String[] bits = v6.getHostAddress().split(":");
+        String ret = "";
+        boolean flag = false;
+        for (int iter = 0; iter < bits.length; iter++) {
+          if (flag) {
+            ret += ":X";
+            continue;
+          }
+          if (!bits[iter].equals("0")) {
+            if (iter == 0) {
+              ret = bits[iter];
+            } else {
+              ret = "::" + bits[iter];
+            }
+            flag = true;
+          }
+        }
+        return ret;
+      }
+    } else {
+      return address.getHostAddress();
+    }
+  }
+
+  /**
+   * Creates a {@link JsonObject} containing most relevant
+   * information of the {@link RegisteredServer} for diagnosis.
+   *
+   * @param server the server to evaluate
+   * @return {@link JsonObject} containing server and diagnostic info
+   */
+  public static JsonObject collectServerInfo(RegisteredServer server) {
+    JsonObject info = new JsonObject();
+    info.addProperty("currentPlayers", server.getPlayersConnected().size());
+    InetSocketAddress iaddr = server.getServerInfo().getAddress();
+    if (iaddr.isUnresolved()) {
+      // Greetings form Netty 4aa10db9
+      info.addProperty("host", iaddr.getHostString());
+    } else {
+      info.addProperty("host", anonymizeInetAddress(iaddr.getAddress()));
+    }
+    info.addProperty("port", iaddr.getPort());
+    return info;
+  }
+
+  /**
+   * Creates a {@link JsonObject} containing information about the
+   * current environment the project is run under.
+   *
+   * @param version the proxy instance to retrieve from
+   * @return {@link JsonObject} containing environment info
+   */
+  public static JsonObject collectProxyInfo(ProxyVersion version) {
+    return (JsonObject) serializeObject(version, false);
+  }
+
+  /**
+   * Creates a {@link JsonObject} containing most relevant
+   * information of the {@link ProxyConfig} for diagnosis.
+   *
+   * @param config the config instance to retrieve from
+   * @return {@link JsonObject} containing select config values
+   */
+  public static JsonObject collectProxyConfig(ProxyConfig config) {
+    return (JsonObject) serializeObject(config, true);
+  }
+
+  /**
+   * Creates a human-readable String from a {@link JsonElement}.
+   *
+   * @param json the {@link JsonElement} object
+   * @return the human-readable String
+   */
+  public static String toHumanReadableString(JsonElement json) {
+    return GSON_WITHOUT_EXCLUDES.toJson(json);
+  }
+
+  /**
+   * Creates a {@link JsonObject} from a String.
+   *
+   * @param toParse the String to parse
+   * @return {@link JsonObject} object
+   */
+  public static JsonObject parseString(String toParse) {
+    return GSON_WITHOUT_EXCLUDES.fromJson(toParse, JsonObject.class);
+  }
+
+  private static JsonElement serializeObject(Object toSerialize, boolean withExcludes) {
+    return JsonParser.parseString(
+            withExcludes ? GSON_WITH_EXCLUDES.toJson(toSerialize) :
+            GSON_WITHOUT_EXCLUDES.toJson(toSerialize));
+  }
+
+  private static final Gson GSON_WITH_EXCLUDES = new GsonBuilder()
+          .setPrettyPrinting()
+          .excludeFieldsWithoutExposeAnnotation()
+          .create();
+
+  private static final Gson GSON_WITHOUT_EXCLUDES = new GsonBuilder()
+          .setPrettyPrinting()
+          .create();
+
+
+}