4.8.1 Release

Forgot to remove cancellation from initial configuration testing
Fixes #594

.github/workflows/gradle.yml

@@ -9,16 +9,15 @@ jobs:
     runs-on: ubuntu-22.04
 
     steps:
-    - uses: actions/checkout@v3
-    - uses: gradle/wrapper-validation-action@v1
+    - name: Checkout Repository
+      uses: actions/checkout@v4
+    - name: Validate Gradle Wrapper
+      uses: gradle/wrapper-validation-action@v1
     - name: Set up JDK 11
       uses: actions/setup-java@v3
       with:
         distribution: 'temurin'
         java-version: 11
+        check-latest: true
     - name: Build with Gradle
       run: ./gradlew build
-    - uses: actions/upload-artifact@v3
-      with:
-        name: artifact
-        path: build/libs

.github/workflows/publish.yml

@@ -0,0 +1,25 @@
+name: Publish to Hangar and Modrinth
+on:
+  push:
+    branches:
+      - master
+      - dev
+
+jobs:
+  publish:
+    if: github.repository_owner == 'ViaVersion'
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v4
+      - uses: gradle/wrapper-validation-action@v1
+      - name: Set up JDK 17
+        uses: actions/setup-java@v3
+        with:
+          distribution: 'temurin'
+          java-version: 17
+          check-latest: true
+      - name: Publish
+        env:
+          HANGAR_TOKEN: ${{ secrets.HANGAR_TOKEN }}
+          MODRINTH_TOKEN: ${{ secrets.MODRINTH_TOKEN }}
+        run: ./gradlew build modrinth publishAllPublicationsToHangar --stacktrace

README.md

@@ -4,43 +4,51 @@
 [![Build Status](https://github.com/ViaVersion/ViaBackwards/actions/workflows/gradle.yml/badge.svg?branch=master)](https://github.com/ViaVersion/ViaBackwards/actions)
 [![Discord](https://img.shields.io/badge/chat-on%20discord-blue.svg)](https://viaversion.com/discord)
 
-**Allows older Minecraft client versions to connect to newer server versions**
+**Allows older Minecraft client versions to connect to newer server versions.**
+
+Requires [ViaVersion](https://hangar.papermc.io/ViaVersion/ViaVersion) to be installed..
 
 Supported Versions
 -
-**Green** = ViaVersion\
-**Purple** = ViaBackwards addition
+As a plugin, ViaBackwards runs on servers on releases 1.10-latest. Versions from the dev branch will also support the
+latest snapshot. You can also use ViaBackwards in ViaFabric or ViaFabricPlus.
 
-![supported_versions](https://i.imgur.com/KpLsMHj.png)
+See [HERE](https://github.com/ViaVersion) for an overview of the different Via* projects.
 
-Releases / Dev Builds
+Releases/Dev Builds
 -
-**Requires [ViaVersion](https://www.spigotmc.org/resources/viaversion.19254/) to be installed**
-   
-You can find the latest dev builds here:\
-**Jenkins:** https://ci.viaversion.com/view/ViaBackwards/
+You can find releases in the following places:
 
-**Spigot page:** https://www.spigotmc.org/resources/viabackwards.27448/
+- **Hangar (for our plugins)**: https://hangar.papermc.io/ViaVersion/ViaBackwards
+- **Modrinth (for our mods)**: https://modrinth.com/mod/viabackwards
+- **GitHub**: https://github.com/ViaVersion/ViaBackwards/releases
 
-**CurseForge page:** https://www.curseforge.com/minecraft/mc-mods/viabackwards
+Dev builds for **all** of our projects are on our Jenkins server:
+
+- **Jenkins**: https://ci.viaversion.com/view/ViaBackwards/
 
 Known issues
 -
-* Custom 1.17+ min_y and height world values are not and will (most likely) never be supported => Clients older than 1.17 will not be able to see or interact with blocks below y=0 and above y=255
-* < 1.17 clients on 1.17+ servers might experience inventory desyncs on certain inventory click actions
+
+* 1.17+ min_y and height world values that are not 0/256 **are not supported**. Clients older than
+  1.17 will not be able to see or interact with blocks below y=0 and above y=255
+* <1.17 clients on 1.17+ servers might experience inventory desyncs on certain inventory click actions
 * Sound mappings are incomplete ([see here](https://github.com/ViaVersion/ViaBackwards/issues/326))
 
 Other Links
 -
 **Maven:** https://repo.viaversion.com
 
-**Issue tracker:** https://github.com/ViaVersion/ViaBackwards/issues
-
 **List of contributors:** https://github.com/ViaVersion/ViaBackwards/graphs/contributors
 
+Building
+-
+After cloning this repository, build the project with Gradle by running `./gradlew build` and take the created jar out
+of the `build/libs` directory.
+
 License
 -
-This project is licensed under the [GNU General Public License](LICENSE).
+This project is licensed under the [GNU General Public License Version 3](LICENSE).
 
 Special Thanks
 -

build-logic/src/main/kotlin/extensions.kt

@@ -38,6 +38,33 @@ fun Project.latestCommitHash(): String {
     return byteOut.toString(Charsets.UTF_8.name()).trim()
 }
 
+fun Project.latestCommitMessage(): String {
+    val byteOut = ByteArrayOutputStream()
+    exec {
+        commandLine = listOf("git", "log", "-1", "--pretty=%B")
+        standardOutput = byteOut
+    }
+    return byteOut.toString(Charsets.UTF_8.name()).trim()
+}
+
+fun Project.branchName(): String {
+    val byteOut = ByteArrayOutputStream()
+    exec {
+        commandLine = listOf("git", "rev-parse", "--abbrev-ref", "HEAD")
+        standardOutput = byteOut
+    }
+    return byteOut.toString(Charsets.UTF_8.name()).trim()
+}
+
+fun Project.parseMinecraftSnapshotVersion(version: String): String? {
+    val separatorIndex = version.indexOf('-')
+    val lastSeparatorIndex = version.lastIndexOf('-')
+    if (separatorIndex == -1 || separatorIndex == lastSeparatorIndex) {
+        return null
+    }
+    return version.substring(separatorIndex + 1, lastSeparatorIndex)
+}
+
 fun JavaPluginExtension.javaTarget(version: Int) {
     sourceCompatibility = JavaVersion.toVersion(version)
     targetCompatibility = JavaVersion.toVersion(version)

build.gradle.kts

@@ -5,7 +5,7 @@ plugins {
 
 allprojects {
     group = "com.viaversion"
-    version = "4.7.0"
+    version = property("projectVersion") as String // from gradle.properties
     description = "Allow older clients to join newer server versions."
 }
 

common/build.gradle.kts

@@ -1,10 +1,17 @@
 plugins {
     id("net.kyori.blossom")
+    id("org.jetbrains.gradle.plugin.idea-ext")
 }
 
-blossom {
-    replaceToken("\$VERSION", project.version)
-    replaceToken("\$IMPL_VERSION", "git-ViaBackwards-${project.version}:${rootProject.latestCommitHash()}")
+sourceSets {
+    main {
+        blossom {
+            javaSources {
+                property("version", project.version.toString())
+                property("impl_version", "git-ViaBackwards-${project.version}:${rootProject.latestCommitHash()}")
+            }
+        }
+    }
 }
 
 dependencies {

common/src/main/java-templates/com/viaversion/viabackwards/utils/VersionInfo.java

@@ -17,7 +17,16 @@
  */
 package com.viaversion.viabackwards.utils;
 
-public class VersionInfo {
+public final class VersionInfo {
 
-    public static final String VERSION = "$VERSION";
+    public static final String VERSION = "{{ version }}";
+    private static final String IMPLEMENTATION_VERSION = "{{ impl_version }}";
+
+    public static String getVersion() {
+        return VERSION;
+    }
+
+    public static String getImplementationVersion() {
+        return IMPLEMENTATION_VERSION;
+    }
 }

common/src/main/java/com/viaversion/viabackwards/ViaBackwardsConfig.java

@@ -21,10 +21,8 @@ import com.viaversion.viaversion.util.Config;
 import java.io.File;
 import java.net.URL;
 import java.util.Collections;
-import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
-import org.checkerframework.checker.nullness.qual.Nullable;
 
 public class ViaBackwardsConfig extends Config implements com.viaversion.viabackwards.api.ViaBackwardsConfig {
 
@@ -34,7 +32,6 @@ public class ViaBackwardsConfig extends Config implements com.viaversion.viaback
     private boolean alwaysShowOriginalMobName;
     private boolean fix1_13FormattedInventoryTitles;
     private boolean handlePingsAsInvAcknowledgements;
-    private Map<String, String> chatTypeFormats;
 
     public ViaBackwardsConfig(File configFile) {
         super(configFile);
@@ -53,7 +50,6 @@ public class ViaBackwardsConfig extends Config implements com.viaversion.viaback
         fix1_13FormattedInventoryTitles = getBoolean("fix-formatted-inventory-titles", true);
         alwaysShowOriginalMobName = getBoolean("always-show-original-mob-name", true);
         handlePingsAsInvAcknowledgements = getBoolean("handle-pings-as-inv-acknowledgements", false);
-        chatTypeFormats = get("chat-types-1_19_1", Map.class, new HashMap<String, String>());
     }
 
     @Override
@@ -86,11 +82,6 @@ public class ViaBackwardsConfig extends Config implements com.viaversion.viaback
         return handlePingsAsInvAcknowledgements || Boolean.getBoolean("com.viaversion.handlePingsAsInvAcknowledgements");
     }
 
-    @Override
-    public @Nullable String chatTypeFormat(final String translationKey) {
-        return chatTypeFormats.get(translationKey);
-    }
-
     @Override
     public URL getDefaultConfigURL() {
         return getClass().getClassLoader().getResource("assets/viabackwards/config.yml");

common/src/main/java/com/viaversion/viabackwards/api/ViaBackwardsConfig.java

@@ -17,8 +17,6 @@
  */
 package com.viaversion.viabackwards.api;
 
-import org.checkerframework.checker.nullness.qual.Nullable;
-
 public interface ViaBackwardsConfig {
 
     /**
@@ -42,6 +40,11 @@ public interface ViaBackwardsConfig {
      */
     boolean isFix1_13FacePlayer();
 
+    /**
+     * Converts the 1.13 face look-at packet for 1.12- players. Requires a bit of extra caching.
+     *
+     * @return true if enabled
+     */
     boolean fix1_13FormattedInventoryTitle();
 
     /**
@@ -51,7 +54,11 @@ public interface ViaBackwardsConfig {
      */
     boolean alwaysShowOriginalMobName();
 
+    /**
+     * Sends inventory acknowledgement packets to act as a replacement for ping packets for sub 1.17 clients.
+     * This only takes effect for ids in the short range. Useful for anticheat compatibility.
+     *
+     * @return true if enabled
+     */
     boolean handlePingsAsInvAcknowledgements();
-
-    @Nullable String chatTypeFormat(String translationKey);
 }

common/src/main/java/com/viaversion/viabackwards/api/ViaBackwardsPlatform.java

@@ -51,18 +51,22 @@ import com.viaversion.viabackwards.protocol.protocol1_19_1to1_19_3.Protocol1_19_
 import com.viaversion.viabackwards.protocol.protocol1_19_3to1_19_4.Protocol1_19_3To1_19_4;
 import com.viaversion.viabackwards.protocol.protocol1_19_4to1_20.Protocol1_19_4To1_20;
 import com.viaversion.viabackwards.protocol.protocol1_19to1_19_1.Protocol1_19To1_19_1;
+import com.viaversion.viabackwards.protocol.protocol1_20to1_20_2.Protocol1_20To1_20_2;
+import com.viaversion.viabackwards.protocol.protocol1_9_1_2to1_9_3_4.Protocol1_9_1_2To1_9_3_4;
 import com.viaversion.viabackwards.protocol.protocol1_9_4to1_10.Protocol1_9_4To1_10;
+import com.viaversion.viabackwards.protocol.protocol1_9to1_9_1.Protocol1_9To1_9_1;
+import com.viaversion.viabackwards.utils.VersionInfo;
 import com.viaversion.viaversion.api.Via;
 import com.viaversion.viaversion.api.protocol.ProtocolManager;
 import com.viaversion.viaversion.api.protocol.version.ProtocolVersion;
 import com.viaversion.viaversion.update.Version;
 import java.io.File;
+import java.util.Arrays;
 import java.util.logging.Logger;
 
 public interface ViaBackwardsPlatform {
 
-    String MINIMUM_VV_VERSION = "4.7.0";
-    String IMPL_VERSION = "$IMPL_VERSION";
+    String MINIMUM_VV_VERSION = "4.8.1";
 
     /**
      * Initialize ViaBackwards.
@@ -78,13 +82,15 @@ public interface ViaBackwardsPlatform {
             return;
         }
 
-        Via.getManager().getSubPlatforms().add(IMPL_VERSION);
+        Via.getManager().getSubPlatforms().add(VersionInfo.getImplementationVersion());
 
         getLogger().info("Loading translations...");
         TranslatableRewriter.loadTranslatables();
 
         getLogger().info("Registering protocols...");
         final ProtocolManager protocolManager = Via.getManager().getProtocolManager();
+        protocolManager.registerProtocol(new Protocol1_9To1_9_1(), ProtocolVersion.v1_9, ProtocolVersion.v1_9_1);
+        protocolManager.registerProtocol(new Protocol1_9_1_2To1_9_3_4(), Arrays.asList(ProtocolVersion.v1_9_1.getVersion(), ProtocolVersion.v1_9_2.getVersion()), ProtocolVersion.v1_9_3.getVersion());
         protocolManager.registerProtocol(new Protocol1_9_4To1_10(), ProtocolVersion.v1_9_3, ProtocolVersion.v1_10);
 
         protocolManager.registerProtocol(new Protocol1_10To1_11(), ProtocolVersion.v1_10, ProtocolVersion.v1_11);
@@ -126,6 +132,7 @@ public interface ViaBackwardsPlatform {
         protocolManager.registerProtocol(new Protocol1_19_3To1_19_4(), ProtocolVersion.v1_19_3, ProtocolVersion.v1_19_4);
 
         protocolManager.registerProtocol(new Protocol1_19_4To1_20(), ProtocolVersion.v1_19_4, ProtocolVersion.v1_20);
+        protocolManager.registerProtocol(new Protocol1_20To1_20_2(), ProtocolVersion.v1_20, ProtocolVersion.v1_20_2);
     }
 
     /**

common/src/main/java/com/viaversion/viabackwards/api/rewriters/EntityRewriter.java

@@ -90,6 +90,10 @@ public abstract class EntityRewriter<C extends ClientboundPacketType, T extends
 
     public PacketHandler getSpawnTrackerWithDataHandler1_19(EntityType fallingBlockType) {
         return wrapper -> {
+            if (protocol.getMappingData() == null) {
+                return;
+            }
+
             // Check against the UNMAPPED entity type
             EntityType entityType = trackAndMapEntity(wrapper);
             if (entityType == fallingBlockType) {

common/src/main/java/com/viaversion/viabackwards/api/rewriters/ItemRewriter.java

@@ -40,6 +40,10 @@ public class ItemRewriter<C extends ClientboundPacketType, S extends Serverbound
         super(protocol, true);
     }
 
+    public ItemRewriter(T protocol, Type<Item> itemType, Type<Item[]> itemArrayType) {
+        super(protocol, itemType, itemArrayType, true);
+    }
+
     @Override
     public @Nullable Item handleItemToClient(@Nullable Item item) {
         if (item == null) {
@@ -82,7 +86,7 @@ public class ItemRewriter<C extends ClientboundPacketType, S extends Serverbound
             }
         }
 
-        MappedItem data = protocol.getMappingData().getMappedItem(item.identifier());
+        MappedItem data = protocol.getMappingData() != null ? protocol.getMappingData().getMappedItem(item.identifier()) : null;
         if (data == null) {
             // Just rewrite the id
             return super.handleItemToClient(item);

common/src/main/java/com/viaversion/viabackwards/api/rewriters/ItemRewriterBase.java

@@ -21,6 +21,7 @@ import com.viaversion.viabackwards.api.BackwardsProtocol;
 import com.viaversion.viaversion.api.minecraft.item.Item;
 import com.viaversion.viaversion.api.protocol.packet.ClientboundPacketType;
 import com.viaversion.viaversion.api.protocol.packet.ServerboundPacketType;
+import com.viaversion.viaversion.api.type.Type;
 import com.viaversion.viaversion.libs.opennbt.tag.builtin.CompoundTag;
 import com.viaversion.viaversion.libs.opennbt.tag.builtin.ListTag;
 import com.viaversion.viaversion.libs.opennbt.tag.builtin.StringTag;
@@ -35,7 +36,11 @@ public abstract class ItemRewriterBase<C extends ClientboundPacketType, S extend
     protected final boolean jsonNameFormat;
 
     protected ItemRewriterBase(T protocol, boolean jsonNameFormat) {
-        super(protocol);
+        this(protocol, Type.FLAT_VAR_INT_ITEM, Type.FLAT_VAR_INT_ITEM_ARRAY_VAR_INT, jsonNameFormat);
+    }
+
+    public ItemRewriterBase(T protocol, Type<Item> itemType, Type<Item[]> itemArrayType, boolean jsonNameFormat) {
+        super(protocol, itemType, itemArrayType);
         this.jsonNameFormat = jsonNameFormat;
         nbtTagName = "VB|" + protocol.getClass().getSimpleName();
     }

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_10to1_11/packets/BlockItemPackets1_11.java

@@ -41,10 +41,11 @@ import com.viaversion.viaversion.libs.opennbt.tag.builtin.ListTag;
 import com.viaversion.viaversion.libs.opennbt.tag.builtin.StringTag;
 import com.viaversion.viaversion.libs.opennbt.tag.builtin.Tag;
 import com.viaversion.viaversion.protocols.protocol1_11to1_10.EntityIdRewriter;
-import com.viaversion.viaversion.protocols.protocol1_9_1_2to1_9_3_4.types.Chunk1_9_3_4Type;
 import com.viaversion.viaversion.protocols.protocol1_9_3to1_9_1_2.ClientboundPackets1_9_3;
 import com.viaversion.viaversion.protocols.protocol1_9_3to1_9_1_2.ServerboundPackets1_9_3;
 import com.viaversion.viaversion.protocols.protocol1_9_3to1_9_1_2.storage.ClientWorld;
+import com.viaversion.viaversion.protocols.protocol1_9_3to1_9_1_2.types.Chunk1_9_3_4Type;
+
 import java.util.Arrays;
 import java.util.Optional;
 

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_11_1to1_12/packets/BlockItemPackets1_12.java

@@ -33,11 +33,12 @@ import com.viaversion.viaversion.libs.opennbt.tag.builtin.LongArrayTag;
 import com.viaversion.viaversion.libs.opennbt.tag.builtin.Tag;
 import com.viaversion.viaversion.protocols.protocol1_12to1_11_1.ClientboundPackets1_12;
 import com.viaversion.viaversion.protocols.protocol1_12to1_11_1.ServerboundPackets1_12;
-import com.viaversion.viaversion.protocols.protocol1_9_1_2to1_9_3_4.types.Chunk1_9_3_4Type;
 import com.viaversion.viaversion.protocols.protocol1_9_3to1_9_1_2.ServerboundPackets1_9_3;
 import com.viaversion.viaversion.protocols.protocol1_9_3to1_9_1_2.storage.ClientWorld;
 import java.util.Iterator;
 import java.util.Map;
+
+import com.viaversion.viaversion.protocols.protocol1_9_3to1_9_1_2.types.Chunk1_9_3_4Type;
 import org.checkerframework.checker.nullness.qual.Nullable;
 
 public class BlockItemPackets1_12 extends LegacyBlockItemRewriter<ClientboundPackets1_12, ServerboundPackets1_9_3, Protocol1_11_1To1_12> {

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_12_2to1_13/packets/BlockItemPackets1_13.java

@@ -54,8 +54,8 @@ import com.viaversion.viaversion.protocols.protocol1_13to1_12_2.Protocol1_13To1_
 import com.viaversion.viaversion.protocols.protocol1_13to1_12_2.data.BlockIdData;
 import com.viaversion.viaversion.protocols.protocol1_13to1_12_2.data.SpawnEggRewriter;
 import com.viaversion.viaversion.protocols.protocol1_13to1_12_2.types.Chunk1_13Type;
-import com.viaversion.viaversion.protocols.protocol1_9_1_2to1_9_3_4.types.Chunk1_9_3_4Type;
 import com.viaversion.viaversion.protocols.protocol1_9_3to1_9_1_2.storage.ClientWorld;
+import com.viaversion.viaversion.protocols.protocol1_9_3to1_9_1_2.types.Chunk1_9_3_4Type;
 import com.viaversion.viaversion.util.Key;
 import java.util.ArrayList;
 import java.util.HashMap;
@@ -240,7 +240,7 @@ public class BlockItemPackets1_13 extends com.viaversion.viabackwards.api.rewrit
                 map(Type.UNSIGNED_BYTE);
                 map(Type.FLAT_ITEM_ARRAY, Type.ITEM_ARRAY);
 
-                handler(itemArrayHandler(Type.ITEM_ARRAY));
+                handler(itemArrayToClientHandler(Type.ITEM_ARRAY));
             }
         });
 

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_12_2to1_13/packets/PlayerPacket1_13.java

@@ -203,11 +203,7 @@ public class PlayerPacket1_13 extends RewriterBase<Protocol1_12_2To1_13> {
                     if (mode == 0 || mode == 2) {
                         JsonElement value = wrapper.read(Type.COMPONENT);
                         String legacyValue = protocol.jsonToLegacy(value);
-                        if (legacyValue.length() > 32) {
-                            legacyValue = legacyValue.substring(0, 32);
-                        }
-
-                        wrapper.write(Type.STRING, legacyValue);
+                        wrapper.write(Type.STRING, ChatUtil.fromLegacy(legacyValue, 'f', 32));
                         int type = wrapper.read(Type.VAR_INT);
                         wrapper.write(Type.STRING, type == 1 ? "hearts" : "integer");
                     }
@@ -225,11 +221,7 @@ public class PlayerPacket1_13 extends RewriterBase<Protocol1_12_2To1_13> {
                     if (action == 0 || action == 2) {
                         JsonElement displayName = wrapper.read(Type.COMPONENT);
                         String legacyTextDisplayName = protocol.jsonToLegacy(displayName);
-                        legacyTextDisplayName = ChatUtil.removeUnusedColor(legacyTextDisplayName, 'f');
-                        if (legacyTextDisplayName.length() > 32) {
-                            legacyTextDisplayName = legacyTextDisplayName.substring(0, 32);
-                        }
-                        wrapper.write(Type.STRING, legacyTextDisplayName);
+                        wrapper.write(Type.STRING, ChatUtil.fromLegacy(legacyTextDisplayName, 'f', 32));
 
                         byte flags = wrapper.read(Type.BYTE);
                         String nameTagVisibility = wrapper.read(Type.STRING);
@@ -247,18 +239,10 @@ public class PlayerPacket1_13 extends RewriterBase<Protocol1_12_2To1_13> {
                         if (ViaBackwards.getConfig().addTeamColorTo1_13Prefix()) {
                             prefix += "§" + (colour > -1 && colour <= 15 ? Integer.toHexString(colour) : "r");
                         }
-
-                        prefix = ChatUtil.removeUnusedColor(prefix, 'f', true);
-                        if (prefix.length() > 16) prefix = prefix.substring(0, 16);
-                        if (prefix.endsWith("§")) prefix = prefix.substring(0, prefix.length() - 1);
-
                         String suffix = protocol.jsonToLegacy(suffixComponent);
-                        suffix = ChatUtil.removeUnusedColor(suffix, '\0'); // Don't remove white coloring
-                        if (suffix.length() > 16) suffix = suffix.substring(0, 16);
-                        if (suffix.endsWith("§")) suffix = suffix.substring(0, suffix.length() - 1);
 
-                        wrapper.write(Type.STRING, prefix);
-                        wrapper.write(Type.STRING, suffix);
+                        wrapper.write(Type.STRING, ChatUtil.fromLegacyPrefix(prefix, 'f', 16));
+                        wrapper.write(Type.STRING, ChatUtil.fromLegacy(suffix, '\0', 16));
 
                         wrapper.write(Type.BYTE, flags);
                         wrapper.write(Type.STRING, nameTagVisibility);

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_15_2to1_16/packets/BlockItemPackets1_16.java

@@ -33,8 +33,10 @@ import com.viaversion.viaversion.api.protocol.remapper.PacketHandlers;
 import com.viaversion.viaversion.api.protocol.version.ProtocolVersion;
 import com.viaversion.viaversion.api.type.Type;
 import com.viaversion.viaversion.api.type.types.UUIDIntArrayType;
+import com.viaversion.viaversion.libs.gson.JsonElement;
 import com.viaversion.viaversion.libs.opennbt.tag.builtin.CompoundTag;
 import com.viaversion.viaversion.libs.opennbt.tag.builtin.IntArrayTag;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.ListTag;
 import com.viaversion.viaversion.libs.opennbt.tag.builtin.LongArrayTag;
 import com.viaversion.viaversion.libs.opennbt.tag.builtin.StringTag;
 import com.viaversion.viaversion.libs.opennbt.tag.builtin.Tag;
@@ -302,6 +304,22 @@ public class BlockItemPackets1_16 extends com.viaversion.viabackwards.api.rewrit
             }
         }
 
+        // Handle hover event changes in book pages
+        if ((item.identifier() == 758 || item.identifier() == 759) && tag != null) {
+            Tag pagesTag = tag.get("pages");
+            if (pagesTag instanceof ListTag) {
+                for (Tag page : ((ListTag) pagesTag)) {
+                    if (!(page instanceof StringTag)) {
+                        continue;
+                    }
+
+                    StringTag pageTag = (StringTag) page;
+                    JsonElement jsonElement = protocol.getTranslatableRewriter().processText(pageTag.getValue());
+                    pageTag.setValue(jsonElement.toString());
+                }
+            }
+        }
+
         InventoryPackets.newToOldAttributes(item);
         enchantmentRewriter.handleToClient(item);
         return item;

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_16_4to1_17/packets/BlockItemPackets1_17.java

@@ -203,7 +203,7 @@ public final class BlockItemPackets1_17 extends ItemRewriter<ClientboundPackets1
                         wrapper.cancel();
                     }
                 });
-                handler(getSpawnParticleHandler(Type.FLAT_VAR_INT_ITEM));
+                handler(getSpawnParticleHandler());
             }
         });
 

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_18_2to1_19/packets/BlockItemPackets1_19.java

@@ -134,7 +134,7 @@ public final class BlockItemPackets1_19 extends ItemRewriter<ClientboundPackets1
                         wrapper.cancel();
                     }
                 });
-                handler(getSpawnParticleHandler(Type.FLAT_VAR_INT_ITEM));
+                handler(getSpawnParticleHandler());
             }
         });
 

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_19_1to1_19_3/Protocol1_19_1To1_19_3.java

@@ -121,6 +121,7 @@ public final class Protocol1_19_1To1_19_3 extends BackwardsProtocol<ClientboundP
                 }
 
                 wrapper.write(Type.VAR_INT, mappedId);
+                return;
             }
 
             // Convert the resource location to the corresponding integer id

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_19_3to1_19_4/packets/EntityPackets1_19_4.java

@@ -28,11 +28,7 @@ import com.viaversion.viaversion.api.type.Type;
 import com.viaversion.viaversion.api.type.types.version.Types1_19_3;
 import com.viaversion.viaversion.api.type.types.version.Types1_19_4;
 import com.viaversion.viaversion.libs.gson.JsonElement;
-import com.viaversion.viaversion.libs.opennbt.tag.builtin.ByteTag;
-import com.viaversion.viaversion.libs.opennbt.tag.builtin.CompoundTag;
-import com.viaversion.viaversion.libs.opennbt.tag.builtin.ListTag;
-import com.viaversion.viaversion.libs.opennbt.tag.builtin.StringTag;
-import com.viaversion.viaversion.libs.opennbt.tag.builtin.Tag;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.*;
 import com.viaversion.viaversion.protocols.protocol1_19_3to1_19_1.ClientboundPackets1_19_3;
 import com.viaversion.viaversion.protocols.protocol1_19_4to1_19_3.ClientboundPackets1_19_4;
 
@@ -72,7 +68,7 @@ public final class EntityPackets1_19_4 extends EntityRewriter<ClientboundPackets
                     final ListTag biomes = biomeRegistry.get("value");
                     for (final Tag biomeTag : biomes) {
                         final CompoundTag biomeData = ((CompoundTag) biomeTag).get("element");
-                        final ByteTag hasPrecipitation = biomeData.get("has_precipitation");
+                        final NumberTag hasPrecipitation = biomeData.get("has_precipitation");
                         biomeData.put("precipitation", new StringTag(hasPrecipitation.asByte() == 1 ? "rain" : "none"));
                     }
                 });

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_19_4to1_20/Protocol1_19_4To1_20.java

@@ -18,25 +18,25 @@
 package com.viaversion.viabackwards.protocol.protocol1_19_4to1_20;
 
 import com.viaversion.viabackwards.api.BackwardsProtocol;
-import com.viaversion.viabackwards.api.data.BackwardsMappings;
 import com.viaversion.viabackwards.api.rewriters.SoundRewriter;
 import com.viaversion.viabackwards.api.rewriters.TranslatableRewriter;
+import com.viaversion.viabackwards.protocol.protocol1_19_4to1_20.data.BackwardsMappings;
 import com.viaversion.viabackwards.protocol.protocol1_19_4to1_20.packets.BlockItemPackets1_20;
 import com.viaversion.viabackwards.protocol.protocol1_19_4to1_20.packets.EntityPackets1_20;
 import com.viaversion.viaversion.api.connection.UserConnection;
+import com.viaversion.viaversion.api.minecraft.RegistryType;
 import com.viaversion.viaversion.api.minecraft.entities.Entity1_19_4Types;
 import com.viaversion.viaversion.api.type.Type;
 import com.viaversion.viaversion.data.entity.EntityTrackerBase;
 import com.viaversion.viaversion.protocols.protocol1_19_4to1_19_3.ClientboundPackets1_19_4;
 import com.viaversion.viaversion.protocols.protocol1_19_4to1_19_3.ServerboundPackets1_19_4;
-import com.viaversion.viaversion.protocols.protocol1_20to1_19_4.Protocol1_20To1_19_4;
 import com.viaversion.viaversion.rewriter.StatisticsRewriter;
 import com.viaversion.viaversion.rewriter.TagRewriter;
 import java.util.Arrays;
 
 public final class Protocol1_19_4To1_20 extends BackwardsProtocol<ClientboundPackets1_19_4, ClientboundPackets1_19_4, ServerboundPackets1_19_4, ServerboundPackets1_19_4> {
 
-    public static final BackwardsMappings MAPPINGS = new BackwardsMappings("1.20", "1.19.4", Protocol1_20To1_19_4.class);
+    public static final BackwardsMappings MAPPINGS = new BackwardsMappings();
     private final TranslatableRewriter<ClientboundPackets1_19_4> translatableRewriter = new TranslatableRewriter<>(this);
     private final EntityPackets1_20 entityRewriter = new EntityPackets1_20(this);
     private final BlockItemPackets1_20 itemRewriter = new BlockItemPackets1_20(this);
@@ -50,6 +50,7 @@ public final class Protocol1_19_4To1_20 extends BackwardsProtocol<ClientboundPac
         super.registerPackets();
 
         final TagRewriter<ClientboundPackets1_19_4> tagRewriter = new TagRewriter<>(this);
+        tagRewriter.addEmptyTag(RegistryType.BLOCK, "minecraft:replaceable_plants");
         tagRewriter.registerGeneric(ClientboundPackets1_19_4.TAGS);
 
         final SoundRewriter<ClientboundPackets1_19_4> soundRewriter = new SoundRewriter<>(this);

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_19_4to1_20/data/BackwardsMappings.java

@@ -0,0 +1,49 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2023 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.protocol.protocol1_19_4to1_20.data;
+
+import com.viaversion.viabackwards.api.data.VBMappingDataLoader;
+import com.viaversion.viaversion.api.minecraft.nbt.BinaryTagIO;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.CompoundTag;
+import com.viaversion.viaversion.protocols.protocol1_20to1_19_4.Protocol1_20To1_19_4;
+
+import java.io.IOException;
+
+public class BackwardsMappings extends com.viaversion.viabackwards.api.data.BackwardsMappings {
+
+    private CompoundTag trimPatternRegistry;
+
+    public BackwardsMappings() {
+        super("1.20", "1.19.4", Protocol1_20To1_19_4.class);
+    }
+
+    @Override
+    protected void loadExtras(CompoundTag data) {
+        super.loadExtras(data);
+
+        try {
+            trimPatternRegistry = BinaryTagIO.readInputStream(VBMappingDataLoader.getResource("trim_pattern-1.19.4.nbt"));
+        } catch (final IOException e) {
+            e.printStackTrace();
+        }
+    }
+
+    public CompoundTag getTrimPatternRegistry() {
+        return trimPatternRegistry;
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_19_4to1_20/packets/BlockItemPackets1_20.java

@@ -17,25 +17,34 @@
  */
 package com.viaversion.viabackwards.protocol.protocol1_19_4to1_20.packets;
 
+import com.viaversion.viabackwards.api.rewriters.ItemRewriter;
 import com.viaversion.viabackwards.protocol.protocol1_19_4to1_20.Protocol1_19_4To1_20;
 import com.viaversion.viabackwards.protocol.protocol1_19_4to1_20.storage.BackSignEditStorage;
 import com.viaversion.viaversion.api.minecraft.BlockChangeRecord;
 import com.viaversion.viaversion.api.minecraft.Position;
 import com.viaversion.viaversion.api.minecraft.blockentity.BlockEntity;
+import com.viaversion.viaversion.api.minecraft.item.Item;
 import com.viaversion.viaversion.api.protocol.remapper.PacketHandlers;
 import com.viaversion.viaversion.api.type.Type;
 import com.viaversion.viaversion.libs.opennbt.tag.builtin.CompoundTag;
 import com.viaversion.viaversion.libs.opennbt.tag.builtin.ListTag;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.StringTag;
 import com.viaversion.viaversion.libs.opennbt.tag.builtin.Tag;
 import com.viaversion.viaversion.protocols.protocol1_18to1_17_1.types.Chunk1_18Type;
 import com.viaversion.viaversion.protocols.protocol1_19_4to1_19_3.ClientboundPackets1_19_4;
 import com.viaversion.viaversion.protocols.protocol1_19_4to1_19_3.ServerboundPackets1_19_4;
 import com.viaversion.viaversion.protocols.protocol1_19_4to1_19_3.rewriter.RecipeRewriter1_19_4;
 import com.viaversion.viaversion.rewriter.BlockRewriter;
-import com.viaversion.viaversion.rewriter.ItemRewriter;
+import com.viaversion.viaversion.util.Key;
+import java.util.Arrays;
+import java.util.HashSet;
+import java.util.Set;
+import org.checkerframework.checker.nullness.qual.Nullable;
 
 public final class BlockItemPackets1_20 extends ItemRewriter<ClientboundPackets1_19_4, ServerboundPackets1_19_4, Protocol1_19_4To1_20> {
 
+    private static final Set<String> NEW_TRIM_PATTERNS = new HashSet<>(Arrays.asList("host", "raiser", "shaper", "silence", "wayfinder"));
+
     public BlockItemPackets1_20(final Protocol1_19_4To1_20 protocol) {
         super(protocol);
     }
@@ -140,6 +149,46 @@ public final class BlockItemPackets1_20 extends ItemRewriter<ClientboundPackets1
         new RecipeRewriter1_19_4<>(protocol).register(ClientboundPackets1_19_4.DECLARE_RECIPES);
     }
 
+    @Override
+    public @Nullable Item handleItemToClient(@Nullable final Item item) {
+        if (item == null) {
+            return null;
+        }
+
+        super.handleItemToClient(item);
+
+        // Remove new trim tags
+        final Tag trimTag;
+        if (item.tag() != null && (trimTag = item.tag().get("Trim")) instanceof CompoundTag) {
+            final Tag patternTag = ((CompoundTag) trimTag).get("pattern");
+            if (patternTag instanceof StringTag) {
+                final StringTag patternStringTag = (StringTag) patternTag;
+                final String pattern = Key.stripMinecraftNamespace(patternStringTag.getValue());
+                if (NEW_TRIM_PATTERNS.contains(pattern)) {
+                    item.tag().remove("Trim");
+                    item.tag().put(nbtTagName + "|Trim", trimTag);
+                }
+            }
+        }
+        return item;
+    }
+
+    @Override
+    public @Nullable Item handleItemToServer(@Nullable final Item item) {
+        if (item == null) {
+            return null;
+        }
+
+        super.handleItemToServer(item);
+
+        // Add back original trim tag
+        final Tag trimTag;
+        if (item.tag() != null && (trimTag = item.tag().remove(nbtTagName + "|Trim")) != null) {
+            item.tag().put("Trim", trimTag);
+        }
+        return item;
+    }
+
     private void handleBlockEntity(final BlockEntity blockEntity) {
         // Check for signs
         if (blockEntity.typeId() != 7 && blockEntity.typeId() != 8) {

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_19_4to1_20/packets/EntityPackets1_20.java

@@ -20,8 +20,10 @@ package com.viaversion.viabackwards.protocol.protocol1_19_4to1_20.packets;
 import com.google.common.collect.Sets;
 import com.viaversion.viabackwards.api.rewriters.EntityRewriter;
 import com.viaversion.viabackwards.protocol.protocol1_19_4to1_20.Protocol1_19_4To1_20;
+import com.viaversion.viaversion.api.minecraft.Quaternion;
 import com.viaversion.viaversion.api.minecraft.entities.Entity1_19_4Types;
 import com.viaversion.viaversion.api.minecraft.entities.EntityType;
+import com.viaversion.viaversion.api.minecraft.metadata.Metadata;
 import com.viaversion.viaversion.api.protocol.remapper.PacketHandlers;
 import com.viaversion.viaversion.api.type.Type;
 import com.viaversion.viaversion.api.type.types.version.Types1_19_4;
@@ -32,12 +34,14 @@ import com.viaversion.viaversion.libs.opennbt.tag.builtin.StringTag;
 import com.viaversion.viaversion.libs.opennbt.tag.builtin.Tag;
 import com.viaversion.viaversion.protocols.protocol1_19_4to1_19_3.ClientboundPackets1_19_4;
 import com.viaversion.viaversion.util.Key;
+
 import java.util.Set;
 
 public final class EntityPackets1_20 extends EntityRewriter<ClientboundPackets1_19_4, Protocol1_19_4To1_20> {
 
     private final Set<String> newTrimPatterns = Sets.newHashSet("host_armor_trim_smithing_template", "raiser_armor_trim_smithing_template",
             "silence_armor_trim_smithing_template", "shaper_armor_trim_smithing_template", "wayfinder_armor_trim_smithing_template");
+    private static final Quaternion Y_FLIPPED_ROTATION = new Quaternion(0, 1, 0, 0);
 
     public EntityPackets1_20(final Protocol1_19_4To1_20 protocol) {
         super(protocol);
@@ -76,7 +80,17 @@ public final class EntityPackets1_20 extends EntityRewriter<ClientboundPackets1_
                 handler(worldDataTrackerHandlerByKey()); // Tracks world height and name for chunk data and entity (un)tracking
                 handler(wrapper -> {
                     final CompoundTag registry = wrapper.get(Type.NBT, 0);
-                    final ListTag values = ((CompoundTag) registry.get("minecraft:trim_pattern")).get("value");
+
+                    ListTag values;
+                    // A 1.20 server can't send this element, and the 1.20 client still works, if the element is missing
+                    // on a 1.19.4 client there is an exception, so in case the 1.20 server doesn't send the element we put in an original 1.20 element
+                    if (registry.contains("minecraft:trim_pattern")) {
+                        values = ((CompoundTag) registry.get("minecraft:trim_pattern")).get("value");
+                    } else {
+                        final CompoundTag trimPatternRegistry = Protocol1_19_4To1_20.MAPPINGS.getTrimPatternRegistry().clone();
+                        registry.put("minecraft:trim_pattern", trimPatternRegistry);
+                        values = trimPatternRegistry.get("value");
+                    }
                     for (final Tag entry : values) {
                         final CompoundTag element = ((CompoundTag) entry).get("element");
                         final StringTag templateItem = element.get("template_item");
@@ -116,10 +130,29 @@ public final class EntityPackets1_20 extends EntityRewriter<ClientboundPackets1_
             final int blockState = meta.value();
             meta.setValue(protocol.getMappingData().getNewBlockStateId(blockState));
         });
+
+        // Rotate item display by 180 degrees around the Y axis
+        filter().filterFamily(Entity1_19_4Types.ITEM_DISPLAY).handler((event, meta) -> {
+            if (event.trackedEntity().hasSentMetadata() || event.hasExtraMeta()) {
+                return;
+            }
+
+            if (event.metaAtIndex(12) == null) {
+                event.createExtraMeta(new Metadata(12, Types1_19_4.META_TYPES.quaternionType, Y_FLIPPED_ROTATION));
+            }
+        });
+        filter().filterFamily(Entity1_19_4Types.ITEM_DISPLAY).index(12).handler((event, meta) -> {
+            final Quaternion quaternion = meta.value();
+            meta.setValue(rotateY180(quaternion));
+        });
     }
 
     @Override
     public EntityType typeFromId(final int type) {
         return Entity1_19_4Types.getTypeFromId(type);
     }
+
+    private Quaternion rotateY180(final Quaternion quaternion) {
+        return new Quaternion(-quaternion.z(), quaternion.w(), quaternion.x(), -quaternion.y());
+    }
 }

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_20to1_20_2/Protocol1_20To1_20_2.java

@@ -0,0 +1,195 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2023 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.protocol.protocol1_20to1_20_2;
+
+import com.viaversion.viabackwards.api.BackwardsProtocol;
+import com.viaversion.viabackwards.api.data.BackwardsMappings;
+import com.viaversion.viabackwards.api.rewriters.SoundRewriter;
+import com.viaversion.viabackwards.protocol.protocol1_20to1_20_2.rewriter.BlockItemPacketRewriter1_20_2;
+import com.viaversion.viabackwards.protocol.protocol1_20to1_20_2.rewriter.EntityPacketRewriter1_20_2;
+import com.viaversion.viabackwards.protocol.protocol1_20to1_20_2.storage.ConfigurationPacketStorage;
+import com.viaversion.viaversion.api.connection.UserConnection;
+import com.viaversion.viaversion.api.minecraft.entities.Entity1_19_4Types;
+import com.viaversion.viaversion.api.protocol.packet.Direction;
+import com.viaversion.viaversion.api.protocol.packet.PacketWrapper;
+import com.viaversion.viaversion.api.protocol.packet.State;
+import com.viaversion.viaversion.api.rewriter.EntityRewriter;
+import com.viaversion.viaversion.api.rewriter.ItemRewriter;
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.data.entity.EntityTrackerBase;
+import com.viaversion.viaversion.exception.CancelException;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.CompoundTag;
+import com.viaversion.viaversion.protocols.base.ClientboundLoginPackets;
+import com.viaversion.viaversion.protocols.base.ServerboundLoginPackets;
+import com.viaversion.viaversion.protocols.protocol1_19_4to1_19_3.ClientboundPackets1_19_4;
+import com.viaversion.viaversion.protocols.protocol1_19_4to1_19_3.ServerboundPackets1_19_4;
+import com.viaversion.viaversion.protocols.protocol1_20_2to1_20.Protocol1_20_2To1_20;
+import com.viaversion.viaversion.protocols.protocol1_20_2to1_20.packet.ClientboundConfigurationPackets1_20_2;
+import com.viaversion.viaversion.protocols.protocol1_20_2to1_20.packet.ClientboundPackets1_20_2;
+import com.viaversion.viaversion.protocols.protocol1_20_2to1_20.packet.ServerboundConfigurationPackets1_20_2;
+import com.viaversion.viaversion.protocols.protocol1_20_2to1_20.packet.ServerboundPackets1_20_2;
+import java.util.UUID;
+
+public final class Protocol1_20To1_20_2 extends BackwardsProtocol<ClientboundPackets1_20_2, ClientboundPackets1_19_4, ServerboundPackets1_20_2, ServerboundPackets1_19_4> {
+
+    public static final BackwardsMappings MAPPINGS = new BackwardsMappings("1.20.2", "1.20", Protocol1_20_2To1_20.class);
+    private final EntityPacketRewriter1_20_2 entityPacketRewriter = new EntityPacketRewriter1_20_2(this);
+    private final BlockItemPacketRewriter1_20_2 itemPacketRewriter = new BlockItemPacketRewriter1_20_2(this);
+
+    public Protocol1_20To1_20_2() {
+        super(ClientboundPackets1_20_2.class, ClientboundPackets1_19_4.class, ServerboundPackets1_20_2.class, ServerboundPackets1_19_4.class);
+    }
+
+    @Override
+    protected void registerPackets() {
+        super.registerPackets();
+
+        final SoundRewriter<ClientboundPackets1_20_2> soundRewriter = new SoundRewriter<>(this);
+        soundRewriter.register1_19_3Sound(ClientboundPackets1_20_2.SOUND);
+        soundRewriter.registerSound(ClientboundPackets1_20_2.ENTITY_SOUND);
+        soundRewriter.registerStopSound(ClientboundPackets1_20_2.STOP_SOUND);
+
+        registerClientbound(ClientboundPackets1_20_2.DISPLAY_SCOREBOARD, wrapper -> {
+            final int slot = wrapper.read(Type.VAR_INT);
+            wrapper.write(Type.BYTE, (byte) slot);
+        });
+
+        registerClientbound(State.LOGIN, ClientboundLoginPackets.GAME_PROFILE.getId(), ClientboundLoginPackets.GAME_PROFILE.getId(), wrapper -> {
+            // We can't set the internal state to configuration here as protocols down the line will expect the state to be play
+            // Add this *before* sending the ack since the server might immediately answer
+            wrapper.user().put(new ConfigurationPacketStorage());
+
+            // Overwrite what is set by the base protocol
+            wrapper.user().getProtocolInfo().setClientState(State.LOGIN);
+
+            // States set to configuration in the base protocol
+            wrapper.create(ServerboundLoginPackets.LOGIN_ACKNOWLEDGED).sendToServer(Protocol1_20To1_20_2.class);
+        });
+
+        registerClientbound(State.CONFIGURATION, ClientboundConfigurationPackets1_20_2.FINISH_CONFIGURATION.getId(), ClientboundConfigurationPackets1_20_2.FINISH_CONFIGURATION.getId(), wrapper -> {
+            wrapper.cancel();
+            wrapper.user().getProtocolInfo().setServerState(State.PLAY);
+            wrapper.user().get(ConfigurationPacketStorage.class).setFinished(true);
+
+            wrapper.create(ServerboundConfigurationPackets1_20_2.FINISH_CONFIGURATION).sendToServer(Protocol1_20To1_20_2.class);
+            wrapper.user().getProtocolInfo().setClientState(State.PLAY);
+        });
+
+        registerServerbound(State.LOGIN, ServerboundLoginPackets.HELLO.getId(), ServerboundLoginPackets.HELLO.getId(), wrapper -> {
+            wrapper.passthrough(Type.STRING); // Name
+
+            // TODO Bad
+            final UUID uuid = wrapper.read(Type.OPTIONAL_UUID);
+            wrapper.write(Type.UUID, uuid != null ? uuid : new UUID(0, 0));
+        });
+
+        registerClientbound(ClientboundPackets1_20_2.START_CONFIGURATION, null, wrapper -> {
+            wrapper.cancel();
+            wrapper.user().getProtocolInfo().setServerState(State.CONFIGURATION);
+
+            // TODO: Check whether all the necessary data for the join game packet is always expected by the client or if we need to cache it from the initial login
+            final PacketWrapper configAcknowledgedPacket = wrapper.create(ServerboundPackets1_20_2.CONFIGURATION_ACKNOWLEDGED);
+            configAcknowledgedPacket.sendToServer(Protocol1_20To1_20_2.class);
+            wrapper.user().getProtocolInfo().setClientState(State.CONFIGURATION);
+            wrapper.user().put(new ConfigurationPacketStorage());
+        });
+        cancelClientbound(ClientboundPackets1_20_2.PONG_RESPONSE);
+
+        // Some can be directly remapped to play packets, others need to be queued
+        registerClientbound(State.CONFIGURATION, ClientboundConfigurationPackets1_20_2.DISCONNECT.getId(), ClientboundPackets1_19_4.DISCONNECT.getId());
+        registerClientbound(State.CONFIGURATION, ClientboundConfigurationPackets1_20_2.KEEP_ALIVE.getId(), ClientboundPackets1_19_4.KEEP_ALIVE.getId());
+        registerClientbound(State.CONFIGURATION, ClientboundConfigurationPackets1_20_2.RESOURCE_PACK.getId(), ClientboundPackets1_19_4.RESOURCE_PACK.getId());
+        registerClientbound(State.CONFIGURATION, ClientboundConfigurationPackets1_20_2.REGISTRY_DATA.getId(), -1, wrapper -> {
+            wrapper.cancel();
+
+            final CompoundTag registry = wrapper.read(Type.NAMELESS_NBT);
+            entityPacketRewriter.trackBiomeSize(wrapper.user(), registry);
+            entityPacketRewriter.cacheDimensionData(wrapper.user(), registry);
+            wrapper.user().get(ConfigurationPacketStorage.class).setRegistry(registry);
+        });
+        registerClientbound(State.CONFIGURATION, ClientboundConfigurationPackets1_20_2.UPDATE_ENABLED_FEATURES.getId(), -1, wrapper -> {
+            wrapper.cancel();
+
+            final String[] enabledFeatures = wrapper.read(Type.STRING_ARRAY);
+            wrapper.user().get(ConfigurationPacketStorage.class).setEnabledFeatures(enabledFeatures);
+        });
+        registerClientbound(State.CONFIGURATION, ClientboundConfigurationPackets1_20_2.UPDATE_TAGS.getId(), -1, wrapper -> {
+            wrapper.cancel();
+            wrapper.user().get(ConfigurationPacketStorage.class).addRawPacket(wrapper, ClientboundPackets1_19_4.TAGS);
+        });
+        registerClientbound(State.CONFIGURATION, ClientboundConfigurationPackets1_20_2.CUSTOM_PAYLOAD.getId(), -1, wrapper -> {
+            wrapper.cancel();
+            wrapper.user().get(ConfigurationPacketStorage.class).addRawPacket(wrapper, ClientboundPackets1_19_4.PLUGIN_MESSAGE);
+        });
+    }
+
+    @Override
+    public void transform(final Direction direction, final State state, final PacketWrapper wrapper) throws Exception {
+        final ConfigurationPacketStorage configurationPacketStorage = wrapper.user().get(ConfigurationPacketStorage.class);
+        if (configurationPacketStorage == null || configurationPacketStorage.isFinished()) {
+            super.transform(direction, state, wrapper);
+            return;
+        }
+        if (direction == Direction.CLIENTBOUND) {
+            super.transform(direction, State.CONFIGURATION, wrapper);
+            return;
+        }
+
+        // Map some of the packets to their configuration counterparts
+        final int id = wrapper.getId();
+        if (id == ServerboundPackets1_19_4.CLIENT_SETTINGS.getId()) {
+            wrapper.setPacketType(ServerboundConfigurationPackets1_20_2.CLIENT_INFORMATION);
+        } else if (id == ServerboundPackets1_19_4.PLUGIN_MESSAGE.getId()) {
+            wrapper.setPacketType(ServerboundConfigurationPackets1_20_2.CUSTOM_PAYLOAD);
+        } else if (id == ServerboundPackets1_19_4.KEEP_ALIVE.getId()) {
+            wrapper.setPacketType(ServerboundConfigurationPackets1_20_2.KEEP_ALIVE);
+        } else if (id == ServerboundPackets1_19_4.PONG.getId()) {
+            wrapper.setPacketType(ServerboundConfigurationPackets1_20_2.PONG);
+        } else if (id == ServerboundPackets1_19_4.RESOURCE_PACK_STATUS.getId()) {
+            wrapper.setPacketType(ServerboundConfigurationPackets1_20_2.RESOURCE_PACK);
+        } else {
+            // TODO Queue
+            throw CancelException.generate();
+        }
+    }
+
+    @Override
+    protected void registerConfigurationChangeHandlers() {
+        // Don't register them in the transitioning protocol
+    }
+
+    @Override
+    public void init(final UserConnection connection) {
+        addEntityTracker(connection, new EntityTrackerBase(connection, Entity1_19_4Types.PLAYER));
+    }
+
+    @Override
+    public BackwardsMappings getMappingData() {
+        return MAPPINGS;
+    }
+
+    @Override
+    public EntityRewriter<Protocol1_20To1_20_2> getEntityRewriter() {
+        return entityPacketRewriter;
+    }
+
+    @Override
+    public ItemRewriter<Protocol1_20To1_20_2> getItemRewriter() {
+        return itemPacketRewriter;
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_20to1_20_2/rewriter/BlockItemPacketRewriter1_20_2.java

@@ -0,0 +1,396 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2023 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.protocol.protocol1_20to1_20_2.rewriter;
+
+import com.viaversion.viabackwards.api.rewriters.ItemRewriter;
+import com.viaversion.viabackwards.protocol.protocol1_20to1_20_2.Protocol1_20To1_20_2;
+import com.viaversion.viaversion.api.data.ParticleMappings;
+import com.viaversion.viaversion.api.data.entity.EntityTracker;
+import com.viaversion.viaversion.api.minecraft.blockentity.BlockEntity;
+import com.viaversion.viaversion.api.minecraft.chunks.Chunk;
+import com.viaversion.viaversion.api.minecraft.chunks.ChunkSection;
+import com.viaversion.viaversion.api.minecraft.chunks.DataPalette;
+import com.viaversion.viaversion.api.minecraft.chunks.PaletteType;
+import com.viaversion.viaversion.api.minecraft.item.Item;
+import com.viaversion.viaversion.api.minecraft.metadata.ChunkPosition;
+import com.viaversion.viaversion.api.protocol.packet.PacketWrapper;
+import com.viaversion.viaversion.api.protocol.remapper.PacketHandlers;
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.CompoundTag;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.IntTag;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.StringTag;
+import com.viaversion.viaversion.protocols.protocol1_18to1_17_1.types.Chunk1_18Type;
+import com.viaversion.viaversion.protocols.protocol1_19_4to1_19_3.ServerboundPackets1_19_4;
+import com.viaversion.viaversion.protocols.protocol1_20_2to1_20.packet.ClientboundPackets1_20_2;
+import com.viaversion.viaversion.protocols.protocol1_20_2to1_20.packet.ServerboundPackets1_20_2;
+import com.viaversion.viaversion.protocols.protocol1_20_2to1_20.rewriter.RecipeRewriter1_20_2;
+import com.viaversion.viaversion.protocols.protocol1_20_2to1_20.type.ChunkType1_20_2;
+import com.viaversion.viaversion.protocols.protocol1_20_2to1_20.util.PotionEffects;
+import com.viaversion.viaversion.rewriter.BlockRewriter;
+import com.viaversion.viaversion.util.Key;
+import com.viaversion.viaversion.util.MathUtil;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+public final class BlockItemPacketRewriter1_20_2 extends ItemRewriter<ClientboundPackets1_20_2, ServerboundPackets1_19_4, Protocol1_20To1_20_2> {
+
+    public BlockItemPacketRewriter1_20_2(final Protocol1_20To1_20_2 protocol) {
+        super(protocol, Type.ITEM1_20_2, Type.ITEM1_20_2_VAR_INT_ARRAY);
+    }
+
+    @Override
+    public void registerPackets() {
+        final BlockRewriter<ClientboundPackets1_20_2> blockRewriter = new BlockRewriter<>(protocol, Type.POSITION1_14);
+        blockRewriter.registerBlockAction(ClientboundPackets1_20_2.BLOCK_ACTION);
+        blockRewriter.registerBlockChange(ClientboundPackets1_20_2.BLOCK_CHANGE);
+        blockRewriter.registerVarLongMultiBlockChange1_20(ClientboundPackets1_20_2.MULTI_BLOCK_CHANGE);
+        blockRewriter.registerEffect(ClientboundPackets1_20_2.EFFECT, 1010, 2001);
+
+        protocol.cancelClientbound(ClientboundPackets1_20_2.CHUNK_BATCH_START);
+        protocol.registerClientbound(ClientboundPackets1_20_2.CHUNK_BATCH_FINISHED, null, wrapper -> {
+            wrapper.cancel();
+
+            final PacketWrapper receivedPacket = wrapper.create(ServerboundPackets1_20_2.CHUNK_BATCH_RECEIVED);
+            receivedPacket.write(Type.FLOAT, 500F); // Requested next batch size... arbitrary value here
+            receivedPacket.sendToServer(Protocol1_20To1_20_2.class);
+        });
+
+        protocol.registerClientbound(ClientboundPackets1_20_2.UNLOAD_CHUNK, wrapper -> {
+            final ChunkPosition chunkPosition = wrapper.read(Type.CHUNK_POSITION);
+            wrapper.write(Type.INT, chunkPosition.chunkX());
+            wrapper.write(Type.INT, chunkPosition.chunkZ());
+        });
+
+        protocol.registerClientbound(ClientboundPackets1_20_2.NBT_QUERY, wrapper -> {
+            wrapper.passthrough(Type.VAR_INT); // Transaction id
+            wrapper.write(Type.NBT, wrapper.read(Type.NAMELESS_NBT));
+        });
+
+        protocol.registerClientbound(ClientboundPackets1_20_2.BLOCK_ENTITY_DATA, wrapper -> {
+            wrapper.passthrough(Type.POSITION1_14); // Position
+            wrapper.passthrough(Type.VAR_INT); // Type
+            wrapper.write(Type.NBT, handleBlockEntity(wrapper.read(Type.NAMELESS_NBT)));
+        });
+
+        protocol.registerClientbound(ClientboundPackets1_20_2.CHUNK_DATA, wrapper -> {
+            final EntityTracker tracker = protocol.getEntityRewriter().tracker(wrapper.user());
+            final Type<Chunk> chunkType = new ChunkType1_20_2(tracker.currentWorldSectionHeight(),
+                    MathUtil.ceilLog2(protocol.getMappingData().getBlockStateMappings().size()),
+                    MathUtil.ceilLog2(tracker.biomesSent()));
+            final Chunk chunk = wrapper.read(chunkType);
+
+            final Type<Chunk> newChunkType = new Chunk1_18Type(tracker.currentWorldSectionHeight(),
+                    MathUtil.ceilLog2(protocol.getMappingData().getBlockStateMappings().mappedSize()),
+                    MathUtil.ceilLog2(tracker.biomesSent()));
+            wrapper.write(newChunkType, chunk);
+
+            for (final ChunkSection section : chunk.getSections()) {
+                final DataPalette blockPalette = section.palette(PaletteType.BLOCKS);
+                for (int i = 0; i < blockPalette.size(); i++) {
+                    final int id = blockPalette.idByIndex(i);
+                    blockPalette.setIdByIndex(i, protocol.getMappingData().getNewBlockStateId(id));
+                }
+            }
+
+            for (final BlockEntity blockEntity : chunk.blockEntities()) {
+                handleBlockEntity(blockEntity.tag());
+            }
+        });
+
+        protocol.registerServerbound(ServerboundPackets1_19_4.SET_BEACON_EFFECT, wrapper -> {
+            // Effects start at 1 before 1.20.2
+            if (wrapper.passthrough(Type.BOOLEAN)) { // Primary effect
+                wrapper.write(Type.VAR_INT, wrapper.read(Type.VAR_INT) - 1);
+            }
+            if (wrapper.passthrough(Type.BOOLEAN)) { // Secondary effect
+                wrapper.write(Type.VAR_INT, wrapper.read(Type.VAR_INT) - 1);
+            }
+        });
+
+        // Replace the NBT type everywhere
+        protocol.registerClientbound(ClientboundPackets1_20_2.WINDOW_ITEMS, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Type.UNSIGNED_BYTE); // Window id
+                map(Type.VAR_INT); // State id
+                handler(wrapper -> {
+                    final Item[] items = wrapper.read(Type.ITEM1_20_2_VAR_INT_ARRAY);
+                    for (final Item item : items) {
+                        handleItemToClient(item);
+                    }
+
+                    wrapper.write(Type.FLAT_VAR_INT_ITEM_ARRAY_VAR_INT, items);
+                    wrapper.write(Type.FLAT_VAR_INT_ITEM, handleItemToClient(wrapper.read(Type.ITEM1_20_2))); // Carried item
+                });
+            }
+        });
+        protocol.registerClientbound(ClientboundPackets1_20_2.SET_SLOT, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Type.UNSIGNED_BYTE); // Window id
+                map(Type.VAR_INT); // State id
+                map(Type.SHORT); // Slot id
+                handler(wrapper -> wrapper.write(Type.FLAT_VAR_INT_ITEM, handleItemToClient(wrapper.read(Type.ITEM1_20_2))));
+            }
+        });
+        protocol.registerClientbound(ClientboundPackets1_20_2.ADVANCEMENTS, wrapper -> {
+            wrapper.passthrough(Type.BOOLEAN); // Reset/clear
+            final int size = wrapper.passthrough(Type.VAR_INT); // Mapping size
+            for (int i = 0; i < size; i++) {
+                wrapper.passthrough(Type.STRING); // Identifier
+
+                // Parent
+                if (wrapper.passthrough(Type.BOOLEAN)) {
+                    wrapper.passthrough(Type.STRING);
+                }
+
+                // Display data
+                if (wrapper.passthrough(Type.BOOLEAN)) {
+                    wrapper.passthrough(Type.COMPONENT); // Title
+                    wrapper.passthrough(Type.COMPONENT); // Description
+                    wrapper.write(Type.FLAT_VAR_INT_ITEM, handleItemToClient(wrapper.read(Type.ITEM1_20_2))); // Icon
+                    wrapper.passthrough(Type.VAR_INT); // Frame type
+                    final int flags = wrapper.passthrough(Type.INT); // Flags
+                    if ((flags & 1) != 0) {
+                        wrapper.passthrough(Type.STRING); // Background texture
+                    }
+                    wrapper.passthrough(Type.FLOAT); // X
+                    wrapper.passthrough(Type.FLOAT); // Y
+                }
+
+                wrapper.write(Type.STRING_ARRAY, new String[0]); // Criteria
+
+                final int requirements = wrapper.passthrough(Type.VAR_INT);
+                for (int array = 0; array < requirements; array++) {
+                    wrapper.passthrough(Type.STRING_ARRAY);
+                }
+
+                wrapper.passthrough(Type.BOOLEAN); // Send telemetry
+            }
+        });
+        protocol.registerClientbound(ClientboundPackets1_20_2.ENTITY_EQUIPMENT, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Type.VAR_INT); // 0 - Entity ID
+                handler(wrapper -> {
+                    byte slot;
+                    do {
+                        slot = wrapper.passthrough(Type.BYTE);
+                        wrapper.write(Type.FLAT_VAR_INT_ITEM, handleItemToClient(wrapper.read(Type.ITEM1_20_2)));
+                    } while ((slot & 0xFFFFFF80) != 0);
+                });
+            }
+        });
+        protocol.registerServerbound(ServerboundPackets1_19_4.CLICK_WINDOW, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Type.UNSIGNED_BYTE); // Window Id
+                map(Type.VAR_INT); // State id
+                map(Type.SHORT); // Slot
+                map(Type.BYTE); // Button
+                map(Type.VAR_INT); // Mode
+
+                handler(wrapper -> {
+                    // Affected items
+                    final int length = wrapper.passthrough(Type.VAR_INT);
+                    for (int i = 0; i < length; i++) {
+                        wrapper.passthrough(Type.SHORT); // Slot
+                        wrapper.write(Type.ITEM1_20_2, handleItemToServer(wrapper.read(Type.FLAT_VAR_INT_ITEM)));
+                    }
+
+                    // Carried item
+                    wrapper.write(Type.ITEM1_20_2, handleItemToServer(wrapper.read(Type.FLAT_VAR_INT_ITEM)));
+                });
+            }
+        });
+        protocol.registerClientbound(ClientboundPackets1_20_2.TRADE_LIST, wrapper -> {
+            wrapper.passthrough(Type.VAR_INT); // Container id
+            final int size = wrapper.passthrough(Type.VAR_INT);
+            for (int i = 0; i < size; i++) {
+                wrapper.write(Type.FLAT_VAR_INT_ITEM, handleItemToClient(wrapper.read(Type.ITEM1_20_2))); // Input
+                wrapper.write(Type.FLAT_VAR_INT_ITEM, handleItemToClient(wrapper.read(Type.ITEM1_20_2))); // Output
+                wrapper.write(Type.FLAT_VAR_INT_ITEM, handleItemToClient(wrapper.read(Type.ITEM1_20_2))); // Second Item
+
+                wrapper.passthrough(Type.BOOLEAN); // Trade disabled
+                wrapper.passthrough(Type.INT); // Number of tools uses
+                wrapper.passthrough(Type.INT); // Maximum number of trade uses
+                wrapper.passthrough(Type.INT); // XP
+                wrapper.passthrough(Type.INT); // Special price
+                wrapper.passthrough(Type.FLOAT); // Price multiplier
+                wrapper.passthrough(Type.INT); // Demand
+            }
+        });
+        protocol.registerServerbound(ServerboundPackets1_19_4.CREATIVE_INVENTORY_ACTION, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Type.SHORT); // 0 - Slot
+                handler(wrapper -> wrapper.write(Type.ITEM1_20_2, handleItemToServer(wrapper.read(Type.FLAT_VAR_INT_ITEM)))); // 1 - Clicked Item
+            }
+        });
+        protocol.registerClientbound(ClientboundPackets1_20_2.SPAWN_PARTICLE, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Type.VAR_INT); // 0 - Particle ID
+                map(Type.BOOLEAN); // 1 - Long Distance
+                map(Type.DOUBLE); // 2 - X
+                map(Type.DOUBLE); // 3 - Y
+                map(Type.DOUBLE); // 4 - Z
+                map(Type.FLOAT); // 5 - Offset X
+                map(Type.FLOAT); // 6 - Offset Y
+                map(Type.FLOAT); // 7 - Offset Z
+                map(Type.FLOAT); // 8 - Particle Data
+                map(Type.INT); // 9 - Particle Count
+                handler(wrapper -> {
+                    final int id = wrapper.get(Type.VAR_INT, 0);
+                    final ParticleMappings mappings = Protocol1_20To1_20_2.MAPPINGS.getParticleMappings();
+                    if (mappings.isBlockParticle(id)) {
+                        final int data = wrapper.read(Type.VAR_INT);
+                        wrapper.write(Type.VAR_INT, protocol.getMappingData().getNewBlockStateId(data));
+                    } else if (mappings.isItemParticle(id)) {
+                        wrapper.write(Type.FLAT_VAR_INT_ITEM, handleItemToClient(wrapper.read(Type.ITEM1_20_2)));
+                    }
+                });
+            }
+        });
+
+        new RecipeRewriter1_20_2<ClientboundPackets1_20_2>(protocol) {
+            @Override
+            public void handleCraftingShapeless(final PacketWrapper wrapper) throws Exception {
+                wrapper.passthrough(Type.STRING); // Group
+                wrapper.passthrough(Type.VAR_INT); // Crafting book category
+                handleIngredients(wrapper);
+
+                final Item result = wrapper.read(itemType());
+                rewrite(result);
+                wrapper.write(Type.FLAT_VAR_INT_ITEM, result);
+            }
+
+            @Override
+            public void handleSmelting(final PacketWrapper wrapper) throws Exception {
+                wrapper.passthrough(Type.STRING); // Group
+                wrapper.passthrough(Type.VAR_INT); // Crafting book category
+                handleIngredient(wrapper);
+
+                final Item result = wrapper.read(itemType());
+                rewrite(result);
+                wrapper.write(Type.FLAT_VAR_INT_ITEM, result);
+
+                wrapper.passthrough(Type.FLOAT); // EXP
+                wrapper.passthrough(Type.VAR_INT); // Cooking time
+            }
+
+            @Override
+            public void handleCraftingShaped(final PacketWrapper wrapper) throws Exception {
+                final int ingredients = wrapper.passthrough(Type.VAR_INT) * wrapper.passthrough(Type.VAR_INT);
+                wrapper.passthrough(Type.STRING); // Group
+                wrapper.passthrough(Type.VAR_INT); // Crafting book category
+                for (int i = 0; i < ingredients; i++) {
+                    handleIngredient(wrapper);
+                }
+
+                final Item result = wrapper.read(itemType());
+                rewrite(result);
+                wrapper.write(Type.FLAT_VAR_INT_ITEM, result);
+
+                wrapper.passthrough(Type.BOOLEAN); // Show notification
+            }
+
+            @Override
+            public void handleStonecutting(final PacketWrapper wrapper) throws Exception {
+                wrapper.passthrough(Type.STRING); // Group
+                handleIngredient(wrapper);
+
+                final Item result = wrapper.read(itemType());
+                rewrite(result);
+                wrapper.write(Type.FLAT_VAR_INT_ITEM, result);
+            }
+
+            @Override
+            public void handleSmithing(final PacketWrapper wrapper) throws Exception {
+                handleIngredient(wrapper); // Base
+                handleIngredient(wrapper); // Addition
+
+                final Item result = wrapper.read(itemType());
+                rewrite(result);
+                wrapper.write(Type.FLAT_VAR_INT_ITEM, result);
+            }
+
+            @Override
+            public void handleSmithingTransform(final PacketWrapper wrapper) throws Exception {
+                handleIngredient(wrapper); // Template
+                handleIngredient(wrapper); // Base
+                handleIngredient(wrapper); // Additions
+
+                final Item result = wrapper.read(itemType());
+                rewrite(result);
+                wrapper.write(Type.FLAT_VAR_INT_ITEM, result);
+            }
+
+            @Override
+            protected void handleIngredient(final PacketWrapper wrapper) throws Exception {
+                final Item[] items = wrapper.read(itemArrayType());
+                wrapper.write(Type.FLAT_VAR_INT_ITEM_ARRAY_VAR_INT, items);
+                for (final Item item : items) {
+                    rewrite(item);
+                }
+            }
+        }.register(ClientboundPackets1_20_2.DECLARE_RECIPES);
+    }
+
+    @Override
+    public @Nullable Item handleItemToClient(@Nullable final Item item) {
+        if (item == null) {
+            return null;
+        }
+        if (item.tag() != null) {
+            com.viaversion.viaversion.protocols.protocol1_20_2to1_20.rewriter.BlockItemPacketRewriter1_20_2.to1_20_1Effects(item);
+        }
+
+        return super.handleItemToClient(item);
+    }
+
+    @Override
+    public @Nullable Item handleItemToServer(@Nullable final Item item) {
+        if (item == null) {
+            return null;
+        }
+        if (item.tag() != null) {
+            com.viaversion.viaversion.protocols.protocol1_20_2to1_20.rewriter.BlockItemPacketRewriter1_20_2.to1_20_2Effects(item);
+        }
+
+        return super.handleItemToServer(item);
+    }
+
+    private @Nullable CompoundTag handleBlockEntity(@Nullable final CompoundTag tag) {
+        if (tag == null) {
+            return null;
+        }
+
+        final StringTag primaryEffect = tag.remove("primary_effect");
+        if (primaryEffect != null) {
+            final String effectKey = Key.stripMinecraftNamespace(primaryEffect.getValue());
+            tag.put("Primary", new IntTag(PotionEffects.keyToId(effectKey)));
+        }
+
+        final StringTag secondaryEffect = tag.remove("secondary_effect");
+        if (secondaryEffect != null) {
+            final String effectKey = Key.stripMinecraftNamespace(secondaryEffect.getValue());
+            tag.put("Secondary", new IntTag(PotionEffects.keyToId(effectKey)));
+        }
+        return tag;
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_20to1_20_2/rewriter/EntityPacketRewriter1_20_2.java

@@ -0,0 +1,210 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2023 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.protocol.protocol1_20to1_20_2.rewriter;
+
+import com.viaversion.viabackwards.api.rewriters.EntityRewriter;
+import com.viaversion.viabackwards.protocol.protocol1_20to1_20_2.Protocol1_20To1_20_2;
+import com.viaversion.viabackwards.protocol.protocol1_20to1_20_2.storage.ConfigurationPacketStorage;
+import com.viaversion.viaversion.api.minecraft.GlobalPosition;
+import com.viaversion.viaversion.api.minecraft.entities.Entity1_19_4Types;
+import com.viaversion.viaversion.api.minecraft.entities.EntityType;
+import com.viaversion.viaversion.api.protocol.packet.PacketWrapper;
+import com.viaversion.viaversion.api.protocol.remapper.PacketHandlers;
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.api.type.types.version.Types1_20;
+import com.viaversion.viaversion.api.type.types.version.Types1_20_2;
+import com.viaversion.viaversion.protocols.protocol1_19_4to1_19_3.ClientboundPackets1_19_4;
+import com.viaversion.viaversion.protocols.protocol1_20_2to1_20.packet.ClientboundPackets1_20_2;
+
+public final class EntityPacketRewriter1_20_2 extends EntityRewriter<ClientboundPackets1_20_2, Protocol1_20To1_20_2> {
+
+    public EntityPacketRewriter1_20_2(final Protocol1_20To1_20_2 protocol) {
+        super(protocol);
+    }
+
+    @Override
+    public void registerPackets() {
+        registerMetadataRewriter(ClientboundPackets1_20_2.ENTITY_METADATA, Types1_20_2.METADATA_LIST, Types1_20.METADATA_LIST);
+        registerRemoveEntities(ClientboundPackets1_20_2.REMOVE_ENTITIES);
+
+        protocol.registerClientbound(ClientboundPackets1_20_2.SPAWN_ENTITY, new PacketHandlers() {
+            @Override
+            protected void register() {
+                handler(wrapper -> {
+                    final int entityId = wrapper.passthrough(Type.VAR_INT);
+                    wrapper.passthrough(Type.UUID); // UUID
+
+                    final int entityType = wrapper.read(Type.VAR_INT);
+                    if (entityType != Entity1_19_4Types.PLAYER.getId()) {
+                        wrapper.write(Type.VAR_INT, entityType);
+
+                        if (entityType == Entity1_19_4Types.FALLING_BLOCK.getId()) {
+                            wrapper.passthrough(Type.DOUBLE); // X
+                            wrapper.passthrough(Type.DOUBLE); // Y
+                            wrapper.passthrough(Type.DOUBLE); // Z
+                            wrapper.passthrough(Type.BYTE); // Pitch
+                            wrapper.passthrough(Type.BYTE); // Yaw
+                            wrapper.passthrough(Type.BYTE); // Head yaw
+                            final int blockState = wrapper.read(Type.VAR_INT); // Data
+                            wrapper.write(Type.VAR_INT, protocol.getMappingData().getNewBlockStateId(blockState));
+                        }
+                        return;
+                    }
+
+                    // Map to spawn player packet
+                    wrapper.setPacketType(ClientboundPackets1_19_4.SPAWN_PLAYER);
+
+                    wrapper.passthrough(Type.DOUBLE); // X
+                    wrapper.passthrough(Type.DOUBLE); // Y
+                    wrapper.passthrough(Type.DOUBLE); // Z
+
+                    final byte pitch = wrapper.read(Type.BYTE);
+                    wrapper.passthrough(Type.BYTE); // Yaw
+                    wrapper.write(Type.BYTE, pitch);
+                    wrapper.read(Type.BYTE); // Head yaw
+                    wrapper.read(Type.VAR_INT); // Data
+
+                    final short velocityX = wrapper.read(Type.SHORT);
+                    final short velocityY = wrapper.read(Type.SHORT);
+                    final short velocityZ = wrapper.read(Type.SHORT);
+                    if (velocityX == 0 && velocityY == 0 && velocityZ == 0) {
+                        return;
+                    }
+
+                    // Follow up with velocity packet
+                    wrapper.send(Protocol1_20To1_20_2.class);
+                    wrapper.cancel();
+
+                    final PacketWrapper velocityPacket = wrapper.create(ClientboundPackets1_19_4.ENTITY_VELOCITY);
+                    velocityPacket.write(Type.VAR_INT, entityId);
+                    velocityPacket.write(Type.SHORT, velocityX);
+                    velocityPacket.write(Type.SHORT, velocityY);
+                    velocityPacket.write(Type.SHORT, velocityZ);
+                    velocityPacket.send(Protocol1_20To1_20_2.class);
+                });
+            }
+        });
+
+        protocol.registerClientbound(ClientboundPackets1_20_2.JOIN_GAME, new PacketHandlers() {
+            @Override
+            public void register() {
+                handler(wrapper -> {
+                    final ConfigurationPacketStorage configurationPacketStorage = wrapper.user().remove(ConfigurationPacketStorage.class);
+                    wrapper.passthrough(Type.INT); // Entity id
+                    wrapper.passthrough(Type.BOOLEAN); // Hardcore
+
+                    final String[] worlds = wrapper.read(Type.STRING_ARRAY);
+                    final int maxPlayers = wrapper.read(Type.VAR_INT);
+                    final int viewDistance = wrapper.read(Type.VAR_INT);
+                    final int simulationDistance = wrapper.read(Type.VAR_INT);
+                    final boolean reducedDebugInfo = wrapper.read(Type.BOOLEAN);
+                    final boolean showRespawnScreen = wrapper.read(Type.BOOLEAN);
+
+                    wrapper.read(Type.BOOLEAN); // Limited crafting
+
+                    final String dimensionType = wrapper.read(Type.STRING);
+                    final String world = wrapper.read(Type.STRING);
+                    final long seed = wrapper.read(Type.LONG);
+
+                    wrapper.write(Type.UNSIGNED_BYTE, wrapper.read(Type.BYTE).shortValue()); // Gamemode
+                    wrapper.passthrough(Type.BYTE); // Previous gamemode
+
+                    wrapper.write(Type.STRING_ARRAY, worlds);
+                    wrapper.write(Type.NBT, configurationPacketStorage.registry());
+                    wrapper.write(Type.STRING, dimensionType);
+                    wrapper.write(Type.STRING, world);
+                    wrapper.write(Type.LONG, seed);
+                    wrapper.write(Type.VAR_INT, maxPlayers);
+                    wrapper.write(Type.VAR_INT, viewDistance);
+                    wrapper.write(Type.VAR_INT, simulationDistance);
+                    wrapper.write(Type.BOOLEAN, reducedDebugInfo);
+                    wrapper.write(Type.BOOLEAN, showRespawnScreen);
+
+                    worldDataTrackerHandlerByKey().handle(wrapper);
+
+                    wrapper.send(Protocol1_20To1_20_2.class);
+                    wrapper.cancel();
+
+                    final PacketWrapper featuresPacket = wrapper.create(ClientboundPackets1_19_4.UPDATE_ENABLED_FEATURES);
+                    featuresPacket.write(Type.STRING_ARRAY, configurationPacketStorage.enabledFeatures());
+                    featuresPacket.send(Protocol1_20To1_20_2.class);
+
+                    configurationPacketStorage.sendQueuedPackets(wrapper.user());
+                });
+            }
+        });
+
+        protocol.registerClientbound(ClientboundPackets1_20_2.RESPAWN, new PacketHandlers() {
+            @Override
+            public void register() {
+                handler(wrapper -> {
+                    wrapper.passthrough(Type.STRING); // Dimension type
+                    wrapper.passthrough(Type.STRING); // World
+                    wrapper.passthrough(Type.LONG); // Seed
+                    wrapper.write(Type.UNSIGNED_BYTE, wrapper.read(Type.BYTE).shortValue()); // Gamemode
+                    wrapper.passthrough(Type.BYTE); // Previous gamemode
+                    wrapper.passthrough(Type.BOOLEAN); // Debug
+                    wrapper.passthrough(Type.BOOLEAN); // Flat
+
+                    final GlobalPosition lastDeathPosition = wrapper.read(Type.OPTIONAL_GLOBAL_POSITION);
+                    final int portalCooldown = wrapper.read(Type.VAR_INT);
+
+                    wrapper.passthrough(Type.BYTE); // Data to keep
+
+                    wrapper.write(Type.OPTIONAL_GLOBAL_POSITION, lastDeathPosition);
+                    wrapper.write(Type.VAR_INT, portalCooldown);
+                });
+                handler(worldDataTrackerHandlerByKey()); // Tracks world height and name for chunk data and entity (un)tracking
+            }
+        });
+
+        protocol.registerClientbound(ClientboundPackets1_20_2.ENTITY_EFFECT, wrapper -> {
+            wrapper.passthrough(Type.VAR_INT); // Entity id
+            wrapper.write(Type.VAR_INT, wrapper.read(Type.VAR_INT) + 1); // Effect id
+            wrapper.passthrough(Type.BYTE); // Amplifier
+            wrapper.passthrough(Type.VAR_INT); // Duration
+            wrapper.passthrough(Type.BYTE); // Flags
+            if (wrapper.passthrough(Type.BOOLEAN)) {
+                wrapper.write(Type.NBT, wrapper.read(Type.NAMELESS_NBT)); // Factor data
+            }
+        });
+
+        protocol.registerClientbound(ClientboundPackets1_20_2.REMOVE_ENTITY_EFFECT, wrapper -> {
+            wrapper.passthrough(Type.VAR_INT); // Entity id
+            wrapper.write(Type.VAR_INT, wrapper.read(Type.VAR_INT) + 1); // Effect id
+        });
+    }
+
+    @Override
+    protected void registerRewrites() {
+        filter().handler((event, meta) -> meta.setMetaType(Types1_20.META_TYPES.byId(meta.metaType().typeId())));
+        registerMetaTypeHandler(null, Types1_20.META_TYPES.blockStateType, Types1_20.META_TYPES.optionalBlockStateType, Types1_20.META_TYPES.particleType, null, null);
+
+        filter().filterFamily(Entity1_19_4Types.DISPLAY).removeIndex(10);
+
+        filter().filterFamily(Entity1_19_4Types.MINECART_ABSTRACT).index(11).handler((event, meta) -> {
+            final int blockState = meta.value();
+            meta.setValue(protocol.getMappingData().getNewBlockStateId(blockState));
+        });
+    }
+
+    @Override
+    public EntityType typeFromId(final int type) {
+        return Entity1_19_4Types.getTypeFromId(type);
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_20to1_20_2/storage/ConfigurationPacketStorage.java

@@ -0,0 +1,102 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2023 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.protocol.protocol1_20to1_20_2.storage;
+
+import com.google.common.base.Preconditions;
+import com.viaversion.viabackwards.protocol.protocol1_20to1_20_2.Protocol1_20To1_20_2;
+import com.viaversion.viaversion.api.connection.StorableObject;
+import com.viaversion.viaversion.api.connection.UserConnection;
+import com.viaversion.viaversion.api.protocol.packet.PacketType;
+import com.viaversion.viaversion.api.protocol.packet.PacketWrapper;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.CompoundTag;
+import io.netty.buffer.ByteBuf;
+import io.netty.buffer.Unpooled;
+import java.util.ArrayList;
+import java.util.List;
+
+public final class ConfigurationPacketStorage implements StorableObject {
+
+    private final List<QueuedPacket> rawPackets = new ArrayList<>();
+    private CompoundTag registry;
+    private String[] enabledFeatures;
+    private boolean finished;
+
+    public CompoundTag registry() {
+        Preconditions.checkNotNull(registry);
+        return registry;
+    }
+
+    public void setRegistry(final CompoundTag registry) {
+        this.registry = registry;
+    }
+
+    public String[] enabledFeatures() {
+        Preconditions.checkNotNull(enabledFeatures);
+        return enabledFeatures;
+    }
+
+    public void setEnabledFeatures(final String[] enabledFeatures) {
+        this.enabledFeatures = enabledFeatures;
+    }
+
+    public void addRawPacket(final PacketWrapper wrapper, final PacketType type) throws Exception {
+        // It's easier to just copy it to a byte array buffer than to manually read the data
+        final ByteBuf buf = Unpooled.buffer();
+        //noinspection deprecation
+        wrapper.setId(-1); // Don't write the packet id to the buffer
+        wrapper.writeToBuffer(buf);
+        rawPackets.add(new QueuedPacket(buf, type));
+    }
+
+    public void sendQueuedPackets(final UserConnection connection) throws Exception {
+        for (final QueuedPacket queuedPacket : rawPackets) {
+            try {
+                final PacketWrapper packet = PacketWrapper.create(queuedPacket.packetType(), queuedPacket.buf(), connection);
+                packet.send(Protocol1_20To1_20_2.class);
+            } finally {
+                queuedPacket.buf().release();
+            }
+        }
+    }
+
+    public boolean isFinished() {
+        return finished;
+    }
+
+    public void setFinished(final boolean finished) {
+        this.finished = finished;
+    }
+
+    public static final class QueuedPacket {
+        private final ByteBuf buf;
+        private final PacketType packetType;
+
+        public QueuedPacket(final ByteBuf buf, final PacketType packetType) {
+            this.buf = buf;
+            this.packetType = packetType;
+        }
+
+        public ByteBuf buf() {
+            return buf;
+        }
+
+        public PacketType packetType() {
+            return packetType;
+        }
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_9_1_2to1_9_3_4/Protocol1_9_1_2To1_9_3_4.java

@@ -0,0 +1,120 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2023 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.protocol.protocol1_9_1_2to1_9_3_4;
+
+import com.viaversion.viabackwards.protocol.protocol1_9_1_2to1_9_3_4.chunks.BlockEntity;
+import com.viaversion.viaversion.api.connection.UserConnection;
+import com.viaversion.viaversion.api.minecraft.Position;
+import com.viaversion.viaversion.api.minecraft.chunks.Chunk;
+import com.viaversion.viaversion.api.protocol.AbstractProtocol;
+import com.viaversion.viaversion.api.protocol.remapper.PacketHandlers;
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.CompoundTag;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.StringTag;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.Tag;
+import com.viaversion.viaversion.protocols.protocol1_9_1to1_9.types.Chunk1_9_1_2Type;
+import com.viaversion.viaversion.protocols.protocol1_9_3to1_9_1_2.ClientboundPackets1_9_3;
+import com.viaversion.viaversion.protocols.protocol1_9_3to1_9_1_2.ServerboundPackets1_9_3;
+import com.viaversion.viaversion.protocols.protocol1_9_3to1_9_1_2.storage.ClientWorld;
+import com.viaversion.viaversion.protocols.protocol1_9_3to1_9_1_2.types.Chunk1_9_3_4Type;
+import com.viaversion.viaversion.protocols.protocol1_9to1_8.ClientboundPackets1_9;
+import com.viaversion.viaversion.protocols.protocol1_9to1_8.ServerboundPackets1_9;
+
+public class Protocol1_9_1_2To1_9_3_4 extends AbstractProtocol<ClientboundPackets1_9_3, ClientboundPackets1_9, ServerboundPackets1_9_3, ServerboundPackets1_9> {
+
+    public Protocol1_9_1_2To1_9_3_4() {
+        super(ClientboundPackets1_9_3.class, ClientboundPackets1_9.class, ServerboundPackets1_9_3.class, ServerboundPackets1_9.class);
+    }
+
+    @Override
+    protected void registerPackets() {
+        registerClientbound(ClientboundPackets1_9_3.BLOCK_ENTITY_DATA, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Type.POSITION); //Position
+                map(Type.UNSIGNED_BYTE); //Type
+                map(Type.NBT); //NBT
+                handler(wrapper -> {
+                    if (wrapper.get(Type.UNSIGNED_BYTE, 0) == 9) {
+                        Position position = wrapper.get(Type.POSITION, 0);
+                        CompoundTag tag = wrapper.get(Type.NBT, 0);
+
+                        wrapper.clearPacket(); //Clear the packet
+
+                        wrapper.setPacketType(ClientboundPackets1_9.UPDATE_SIGN);
+                        wrapper.write(Type.POSITION, position); // Position
+                        for (int i = 1; i < 5; i++) {
+                            // Should technically be written as COMPONENT, but left as String for simplification/to remove redundant wrapping for VR
+                            Tag textTag = tag.get("Text" + i);
+                            String line = textTag instanceof StringTag ? ((StringTag) textTag).getValue() : "";
+                            wrapper.write(Type.STRING, line); // Sign line
+                        }
+                    }
+                });
+            }
+        });
+
+        registerClientbound(ClientboundPackets1_9_3.CHUNK_DATA, wrapper -> {
+            ClientWorld clientWorld = wrapper.user().get(ClientWorld.class);
+
+            Chunk1_9_3_4Type newType = new Chunk1_9_3_4Type(clientWorld);
+            Chunk1_9_1_2Type oldType = new Chunk1_9_1_2Type(clientWorld); // Get the old type to not write Block Entities
+
+            Chunk chunk = wrapper.read(newType);
+            wrapper.write(oldType, chunk);
+            BlockEntity.handle(chunk.getBlockEntities(), wrapper.user());
+        });
+
+        registerClientbound(ClientboundPackets1_9_3.JOIN_GAME, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Type.INT); // 0 - Entity ID
+                map(Type.UNSIGNED_BYTE); // 1 - Gamemode
+                map(Type.INT); // 2 - Dimension
+
+                handler(wrapper -> {
+                    ClientWorld clientChunks = wrapper.user().get(ClientWorld.class);
+
+                    int dimensionId = wrapper.get(Type.INT, 1);
+                    clientChunks.setEnvironment(dimensionId);
+                });
+            }
+        });
+
+        registerClientbound(ClientboundPackets1_9_3.RESPAWN, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Type.INT); // 0 - Dimension ID
+
+                handler(wrapper -> {
+                    ClientWorld clientWorld = wrapper.user().get(ClientWorld.class);
+
+                    int dimensionId = wrapper.get(Type.INT, 0);
+                    clientWorld.setEnvironment(dimensionId);
+                });
+            }
+        });
+    }
+
+    @Override
+    public void init(UserConnection userConnection) {
+        if (!userConnection.has(ClientWorld.class)) {
+            userConnection.put(new ClientWorld(userConnection));
+        }
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_9_1_2to1_9_3_4/chunks/BlockEntity.java

@@ -0,0 +1,85 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2023 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.protocol.protocol1_9_1_2to1_9_3_4.chunks;
+
+import com.viaversion.viabackwards.protocol.protocol1_9_1_2to1_9_3_4.Protocol1_9_1_2To1_9_3_4;
+import com.viaversion.viaversion.api.Via;
+import com.viaversion.viaversion.api.connection.UserConnection;
+import com.viaversion.viaversion.api.minecraft.Position;
+import com.viaversion.viaversion.api.protocol.packet.PacketWrapper;
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.CompoundTag;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.NumberTag;
+import com.viaversion.viaversion.protocols.protocol1_9_3to1_9_1_2.ClientboundPackets1_9_3;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+public class BlockEntity {
+    private static final Map<String, Integer> types = new HashMap<>();
+
+    static {
+        types.put("MobSpawner", 1);
+        types.put("Control", 2);
+        types.put("Beacon", 3);
+        types.put("Skull", 4);
+        types.put("FlowerPot", 5);
+        types.put("Banner", 6);
+        types.put("UNKNOWN", 7);
+        types.put("EndGateway", 8);
+        types.put("Sign", 9);
+    }
+
+    public static void handle(List<CompoundTag> tags, UserConnection connection) {
+        for (CompoundTag tag : tags) {
+            try {
+                if (!tag.contains("id"))
+                    throw new Exception("NBT tag not handled because the id key is missing");
+
+                String id = (String) tag.get("id").getValue();
+                if (!types.containsKey(id))
+                    throw new Exception("Not handled id: " + id);
+
+                int newId = types.get(id);
+                if (newId == -1)
+                    continue;
+
+                int x = ((NumberTag) tag.get("x")).asInt();
+                int y = ((NumberTag) tag.get("y")).asInt();
+                int z = ((NumberTag) tag.get("z")).asInt();
+
+                Position pos = new Position(x, (short) y, z);
+
+                updateBlockEntity(pos, (short) newId, tag, connection);
+            } catch (Exception e) {
+                if (Via.getManager().isDebug()) {
+                    Via.getPlatform().getLogger().warning("Block Entity: " + e.getMessage() + ": " + tag);
+                }
+            }
+        }
+    }
+
+    private static void updateBlockEntity(Position pos, short id, CompoundTag tag, UserConnection connection) throws Exception {
+        PacketWrapper wrapper = PacketWrapper.create(ClientboundPackets1_9_3.BLOCK_ENTITY_DATA, null, connection);
+        wrapper.write(Type.POSITION, pos);
+        wrapper.write(Type.UNSIGNED_BYTE, id);
+        wrapper.write(Type.NBT, tag);
+        wrapper.scheduleSend(Protocol1_9_1_2To1_9_3_4.class, false);
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_9_4to1_10/packets/BlockItemPackets1_10.java

@@ -25,10 +25,10 @@ import com.viaversion.viaversion.api.minecraft.chunks.Chunk;
 import com.viaversion.viaversion.api.minecraft.item.Item;
 import com.viaversion.viaversion.api.protocol.remapper.PacketHandlers;
 import com.viaversion.viaversion.api.type.Type;
-import com.viaversion.viaversion.protocols.protocol1_9_1_2to1_9_3_4.types.Chunk1_9_3_4Type;
 import com.viaversion.viaversion.protocols.protocol1_9_3to1_9_1_2.ClientboundPackets1_9_3;
 import com.viaversion.viaversion.protocols.protocol1_9_3to1_9_1_2.ServerboundPackets1_9_3;
 import com.viaversion.viaversion.protocols.protocol1_9_3to1_9_1_2.storage.ClientWorld;
+import com.viaversion.viaversion.protocols.protocol1_9_3to1_9_1_2.types.Chunk1_9_3_4Type;
 
 public class BlockItemPackets1_10 extends LegacyBlockItemRewriter<ClientboundPackets1_9_3, ServerboundPackets1_9_3, Protocol1_9_4To1_10> {
 

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_9to1_9_1/Protocol1_9To1_9_1.java

@@ -0,0 +1,64 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2023 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.protocol.protocol1_9to1_9_1;
+
+import com.viaversion.viaversion.api.protocol.AbstractProtocol;
+import com.viaversion.viaversion.api.protocol.remapper.PacketHandlers;
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.protocols.protocol1_9to1_8.ClientboundPackets1_9;
+import com.viaversion.viaversion.protocols.protocol1_9to1_8.ServerboundPackets1_9;
+
+public class Protocol1_9To1_9_1 extends AbstractProtocol<ClientboundPackets1_9, ClientboundPackets1_9, ServerboundPackets1_9, ServerboundPackets1_9> {
+
+    public Protocol1_9To1_9_1() {
+        super(ClientboundPackets1_9.class, ClientboundPackets1_9.class, ServerboundPackets1_9.class, ServerboundPackets1_9.class);
+    }
+
+    @Override
+    protected void registerPackets() {
+        registerClientbound(ClientboundPackets1_9.JOIN_GAME, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Type.INT); // 0 - Player ID
+                map(Type.UNSIGNED_BYTE); // 1 - Player Gamemode
+                // 1.9.1 PRE 2 Changed this
+                map(Type.INT, Type.BYTE); // 2 - Player Dimension
+                map(Type.UNSIGNED_BYTE); // 3 - World Difficulty
+                map(Type.UNSIGNED_BYTE); // 4 - Max Players (Tab)
+                map(Type.STRING); // 5 - Level Type
+                map(Type.BOOLEAN); // 6 - Reduced Debug info
+            }
+        });
+
+        registerClientbound(ClientboundPackets1_9.SOUND, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Type.VAR_INT); // 0 - Sound ID
+
+                handler(wrapper -> {
+                    int sound = wrapper.get(Type.VAR_INT, 0);
+
+                    if (sound == 415) // Stop the Elytra sound for 1.9 (It's introduced in 1.9.2)
+                        wrapper.cancel();
+                    else if (sound >= 416) // Act like the Elytra sound never existed
+                        wrapper.set(Type.VAR_INT, 0, sound - 1);
+                });
+            }
+        });
+    }
+}

common/src/main/java/com/viaversion/viabackwards/utils/ChatUtil.java

@@ -17,6 +17,9 @@
  */
 package com.viaversion.viabackwards.utils;
 
+import java.util.HashSet;
+import java.util.Objects;
+import java.util.Set;
 import java.util.regex.Pattern;
 
 public class ChatUtil {
@@ -27,25 +30,103 @@ public class ChatUtil {
         return removeUnusedColor(legacy, defaultColor, false);
     }
 
+    private static class ChatFormattingState {
+        private final Set<Character> formatting;
+        private final char defaultColor;
+        private char color;
+
+        private ChatFormattingState(char defaultColor) {
+            this(new HashSet<>(), defaultColor, defaultColor);
+        }
+
+        public ChatFormattingState(Set<Character> formatting, char defaultColor, char color) {
+            this.formatting = formatting;
+            this.defaultColor = defaultColor;
+            this.color = color;
+        }
+
+        private void setColor(char newColor) {
+            formatting.clear();
+            color = newColor;
+        }
+
+        public ChatFormattingState copy() {
+            return new ChatFormattingState(new HashSet<>(formatting), defaultColor, color);
+        }
+
+        public void appendTo(StringBuilder builder) {
+            builder.append('§').append(color);
+            for (Character formatCharacter : formatting) {
+                builder.append('§').append(formatCharacter);
+            }
+        }
+
+        @Override
+        public boolean equals(Object o) {
+            if (this == o) {
+                return true;
+            }
+            if (o == null || getClass() != o.getClass()) {
+                return false;
+            }
+            ChatFormattingState that = (ChatFormattingState) o;
+            return defaultColor == that.defaultColor
+                && color == that.color
+                && Objects.equals(formatting, that.formatting);
+        }
+
+        @Override
+        public int hashCode() {
+            return Objects.hash(formatting, defaultColor, color);
+        }
+
+        public void processNextControlChar(char controlChar) {
+            if (controlChar == 'r') {
+                setColor(defaultColor);
+                return;
+            }
+            if (controlChar == 'l' || controlChar == 'm' || controlChar == 'n' || controlChar == 'o') {
+                formatting.add(controlChar);
+                return;
+            }
+            setColor(controlChar);
+        }
+    }
+
+    public static String fromLegacy(String legacy, char defaultColor, int limit) {
+        return fromLegacy(legacy, defaultColor, limit, false);
+    }
+
+    public static String fromLegacyPrefix(String legacy, char defaultColor, int limit) {
+        return fromLegacy(legacy, defaultColor, limit, true);
+    }
+
+    public static String fromLegacy(String legacy, char defaultColor, int limit, boolean isPrefix) {
+        legacy = removeUnusedColor(legacy, defaultColor, isPrefix);
+        if (legacy.length() > limit) legacy = legacy.substring(0, limit);
+        if (legacy.endsWith("§")) legacy = legacy.substring(0, legacy.length() - 1);
+        return legacy;
+    }
+
     public static String removeUnusedColor(String legacy, char defaultColor, boolean isPrefix) {
         if (legacy == null) return null;
-
         Pattern pattern = isPrefix ? UNUSED_COLOR_PATTERN_PREFIX : UNUSED_COLOR_PATTERN;
         legacy = pattern.matcher(legacy).replaceAll("$1$2");
         StringBuilder builder = new StringBuilder();
-        char last = defaultColor;
+        ChatFormattingState builderState = new ChatFormattingState(defaultColor);
+        ChatFormattingState lastState = new ChatFormattingState(defaultColor);
         for (int i = 0; i < legacy.length(); i++) {
             char current = legacy.charAt(i);
             if (current != '§' || i == legacy.length() - 1) {
+                if (!lastState.equals(builderState)) {
+                    lastState.appendTo(builder);
+                    builderState = lastState.copy();
+                }
                 builder.append(current);
                 continue;
             }
-
             current = legacy.charAt(++i);
-            if (current != last) {
-                builder.append('§').append(current);
-                last = current;
-            }
+            lastState.processNextControlChar(current);
         }
         return builder.toString();
     }

common/src/main/resources/assets/viabackwards/config.yml

@@ -19,14 +19,4 @@ fix-formatted-inventory-titles: true
 #
 # Sends inventory acknowledgement packets to act as a replacement for ping packets for sub 1.17 clients.
 # This only takes effect for ids in the short range. Useful for anticheat compatibility.
-handle-pings-as-inv-acknowledgements: false
-#
-# 1.19.1 chat type formats.
-chat-types-1_19_1:
-  "chat.type.text": "<%s> %s"
-  "chat.type.announcement": "[%s] %s"
-  "commands.message.display.incoming": "%s whispers to you: %s"
-  "commands.message.display.outgoing": "You whisper to %s: %s"
-  "chat.type.team.text": "%s <%s> %s"
-  "chat.type.team.sent": "-> %s <%s> %s"
-  "chat.type.emote": "* %s %s"
+handle-pings-as-inv-acknowledgements: false

gradle.properties

@@ -0,0 +1,7 @@
+projectVersion=4.8.1
+
+# Smile emoji
+mcVersions=1.20.2, 1.20.1, 1.20, 1.19.4, 1.19.3, 1.19.2, 1.19.1, 1.19, 1.18.2, 1.18.1, 1.18, 1.17.1, 1.17, 1.16.5, 1.16.4, 1.16.3, 1.16.2, 1.16.1, 1.16, 1.15.2, 1.15.1, 1.15, 1.14.4, 1.14.3, 1.14.2, 1.14.1, 1.14, 1.13.2, 1.13.1, 1.13, 1.12.2, 1.12.1, 1.12, 1.11.2, 1.11.1, 1.11, 1.10.2, 1.10.1, 1.10
+mcVersionRange=1.10-1.20.2
+waterfallVersion=1.20
+velocityVersion=3.2

gradle/libs.versions.toml

@@ -3,7 +3,7 @@ metadata.format.version = "1.1"
 [versions]
 
 # ViaVersion
-viaver = "4.7.0-1.20-rc1-SNAPSHOT"
+viaver = "4.8.1-SNAPSHOT"
 
 # Common provided
 netty = "4.0.20.Final"

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,7 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.1.1-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.3-bin.zip
 networkTimeout=10000
+validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists

gradlew

@@ -83,7 +83,8 @@ done
 # This is normally unused
 # shellcheck disable=SC2034
 APP_BASE_NAME=${0##*/}
-APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
+# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
+APP_HOME=$( cd "${APP_HOME:-./}" > /dev/null && pwd -P ) || exit
 
 # Use the maximum available, or set MAX_FD != -1 to use that value.
 MAX_FD=maximum
@@ -130,10 +131,13 @@ location of your Java installation."
     fi
 else
     JAVACMD=java
-    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+    if ! command -v java >/dev/null 2>&1
+    then
+        die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
 
 Please set the JAVA_HOME variable in your environment to match the
 location of your Java installation."
+    fi
 fi
 
 # Increase the maximum file descriptors if we can.

gradlew.bat

@@ -1,92 +1,92 @@
-@rem
-@rem Copyright 2015 the original author or authors.
-@rem
-@rem Licensed under the Apache License, Version 2.0 (the "License");
-@rem you may not use this file except in compliance with the License.
-@rem You may obtain a copy of the License at
-@rem
-@rem      https://www.apache.org/licenses/LICENSE-2.0
-@rem
-@rem Unless required by applicable law or agreed to in writing, software
-@rem distributed under the License is distributed on an "AS IS" BASIS,
-@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-@rem See the License for the specific language governing permissions and
-@rem limitations under the License.
-@rem
-
-@if "%DEBUG%"=="" @echo off
-@rem ##########################################################################
-@rem
-@rem  Gradle startup script for Windows
-@rem
-@rem ##########################################################################
-
-@rem Set local scope for the variables with windows NT shell
-if "%OS%"=="Windows_NT" setlocal
-
-set DIRNAME=%~dp0
-if "%DIRNAME%"=="" set DIRNAME=.
-@rem This is normally unused
-set APP_BASE_NAME=%~n0
-set APP_HOME=%DIRNAME%
-
-@rem Resolve any "." and ".." in APP_HOME to make it shorter.
-for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
-
-@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
-set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
-
-@rem Find java.exe
-if defined JAVA_HOME goto findJavaFromJavaHome
-
-set JAVA_EXE=java.exe
-%JAVA_EXE% -version >NUL 2>&1
-if %ERRORLEVEL% equ 0 goto execute
-
-echo.
-echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
-echo.
-echo Please set the JAVA_HOME variable in your environment to match the
-echo location of your Java installation.
-
-goto fail
-
-:findJavaFromJavaHome
-set JAVA_HOME=%JAVA_HOME:"=%
-set JAVA_EXE=%JAVA_HOME%/bin/java.exe
-
-if exist "%JAVA_EXE%" goto execute
-
-echo.
-echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
-echo.
-echo Please set the JAVA_HOME variable in your environment to match the
-echo location of your Java installation.
-
-goto fail
-
-:execute
-@rem Setup the command line
-
-set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
-
-
-@rem Execute Gradle
-"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
-
-:end
-@rem End local scope for the variables with windows NT shell
-if %ERRORLEVEL% equ 0 goto mainEnd
-
-:fail
-rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
-rem the _cmd.exe /c_ return code!
-set EXIT_CODE=%ERRORLEVEL%
-if %EXIT_CODE% equ 0 set EXIT_CODE=1
-if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
-exit /b %EXIT_CODE%
-
-:mainEnd
-if "%OS%"=="Windows_NT" endlocal
-
-:omega
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%"=="" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%"=="" set DIRNAME=.
+@rem This is normally unused
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if %ERRORLEVEL% equ 0 goto execute
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if %ERRORLEVEL% equ 0 goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+set EXIT_CODE=%ERRORLEVEL%
+if %EXIT_CODE% equ 0 set EXIT_CODE=1
+if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
+exit /b %EXIT_CODE%
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

settings.gradle.kts

@@ -15,7 +15,8 @@ dependencyResolutionManagement {
 
 pluginManagement {
     plugins {
-        id("net.kyori.blossom") version "1.2.0"
+        id("net.kyori.blossom") version "2.1.0"
+        id("org.jetbrains.gradle.plugin.idea-ext") version "1.1.7"
         id("com.github.johnrengelman.shadow") version "8.1.1"
     }
 }

universal/build.gradle.kts

@@ -1,7 +1,10 @@
 import com.github.jengelman.gradle.plugins.shadow.tasks.ShadowJar
+import io.papermc.hangarpublishplugin.model.Platforms
 
 plugins {
     id("com.github.johnrengelman.shadow")
+    id("io.papermc.hangar-publish-plugin") version "0.1.0"
+    id("com.modrinth.minotaur") version "2.+"
 }
 
 val platforms = setOf(
@@ -39,3 +42,85 @@ tasks {
 }
 
 publishShadowJar()
+
+val branch = rootProject.branchName()
+val baseVersion = project.version as String
+val isRelease = !baseVersion.contains('-')
+val isMainBranch = branch == "master"
+if (!isRelease || isMainBranch) { // Only publish releases from the main branch
+    val suffixedVersion = if (isRelease) baseVersion else baseVersion + "+" + System.getenv("GITHUB_RUN_NUMBER")
+    val changelogContent = if (isRelease) {
+        "See [GitHub](https://github.com/ViaVersion/ViaBackwards) for release notes."
+    } else {
+        val commitHash = rootProject.latestCommitHash()
+        "[$commitHash](https://github.com/ViaVersion/ViaBackwards/commit/$commitHash) ${rootProject.latestCommitMessage()}"
+    }
+    modrinth {
+        // val snapshotVersion = rootProject.parseMinecraftSnapshotVersion(project.version as String)
+        val mcVersions: List<String> = (property("mcVersions") as String)
+                .split(",")
+                .map { it.trim() }
+        //.let { if (snapshotVersion != null) it + snapshotVersion else it } // We're usually too fast for modrinth
+
+        token.set(System.getenv("MODRINTH_TOKEN"))
+        projectId.set("viabackwards")
+        versionType.set(if (isRelease) "release" else if (isMainBranch) "beta" else "alpha")
+        versionNumber.set(suffixedVersion)
+        versionName.set(suffixedVersion)
+        changelog.set(changelogContent)
+        uploadFile.set(tasks.shadowJar.flatMap { it.archiveFile })
+        gameVersions.set(mcVersions)
+        loaders.add("fabric")
+        loaders.add("paper")
+        loaders.add("folia")
+        loaders.add("velocity")
+        loaders.add("bungeecord")
+        loaders.add("sponge")
+        autoAddDependsOn.set(false)
+        detectLoaders.set(false)
+        dependencies {
+            optional.project("viaversion")
+            optional.project("viafabric")
+            optional.project("viafabricplus")
+        }
+    }
+
+    hangarPublish {
+        publications.register("plugin") {
+            version.set(suffixedVersion)
+            id.set("ViaBackwards")
+            channel.set(if (isRelease) "Release" else if (isMainBranch) "Snapshot" else "Alpha")
+            changelog.set(changelogContent)
+            apiKey.set(System.getenv("HANGAR_TOKEN"))
+            platforms {
+                register(Platforms.PAPER) {
+                    jar.set(tasks.shadowJar.flatMap { it.archiveFile })
+                    platformVersions.set(listOf(property("mcVersionRange") as String))
+                    dependencies {
+                        hangar("ViaVersion") {
+                            required.set(true)
+                        }
+                    }
+                }
+                register(Platforms.VELOCITY) {
+                    jar.set(tasks.shadowJar.flatMap { it.archiveFile })
+                    platformVersions.set(listOf(property("velocityVersion") as String))
+                    dependencies {
+                        hangar("ViaVersion") {
+                            required.set(true)
+                        }
+                    }
+                }
+                register(Platforms.WATERFALL) {
+                    jar.set(tasks.shadowJar.flatMap { it.archiveFile })
+                    platformVersions.set(listOf(property("waterfallVersion") as String))
+                    dependencies {
+                        hangar("ViaVersion") {
+                            required.set(true)
+                        }
+                    }
+                }
+            }
+        }
+    }
+}