Merge branch '1.21.5-multiloader' into 1.21-multiloader

# Conflicts:
#	gradle.properties

.github/ISSUE_TEMPLATE/bug_report.yaml

@@ -0,0 +1,90 @@
+name: Bug Report
+description: Report a bug encountered with SkinRestorer
+title: "[Bug]: "
+labels: ["bug"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        🐛 **Before submitting:**
+        - Ensure you're using the latest mod version
+        - Ensure this bug is reproducible consistently
+        - Check existing issues for duplicates
+
+  - type: input
+    id: mod-version
+    attributes:
+      label: SkinRestorer Version
+      description: Exact version of the mod
+      placeholder: e.g., 2.2.1
+    validations:
+      required: true
+
+  - type: input
+    id: minecraft-version
+    attributes:
+      label: Minecraft Version
+      description: Full Minecraft version
+      placeholder: e.g., 1.21.4
+    validations:
+      required: true
+
+  - type: input
+    id: loader-version
+    attributes:
+      label: Mod Loader & Version
+      description: Fabric/Quilt/Forge/NeoForge version
+      placeholder: e.g., Fabric 0.15.7
+    validations:
+      required: true
+
+  - type: input
+    id: java-version
+    attributes:
+      label: Java Version
+      placeholder: e.g. 17, 21
+    validations:
+      required: true
+
+  - type: textarea
+    id: description
+    attributes:
+      label: Bug Description
+      description: What happened vs what you expected to happen
+    validations:
+      required: true
+
+  - type: textarea
+    id: steps
+    attributes:
+      label: Reproduction Steps
+      description: Provide step-by-step instructions or a video showing how to reproduce the issue.
+      placeholder: |
+        1. 
+        2. 
+        3. 
+        Or a video demonstrating the issue.
+    validations:
+      required: true
+
+  - type: textarea
+    id: logs
+    attributes:
+      label: Relevant Logs
+      description: |
+        Please provide any relevant logs, especially error logs from your server console or `latest.log` file.
+        **Important**: Paste the FULL log content. Use a service like [mclo.gs](https://mclo.gs/).
+      render: shell
+    validations:
+      required: true
+
+  - type: checkboxes
+    id: confirmations
+    attributes:
+      label: Confirmations
+      options:
+        - label: I've checked for existing issues
+          required: true
+        - label: This bug is reproducible consistently
+          required: true
+        - label: I've tested without other mods

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1 @@
+blank_issues_enabled: true

.github/ISSUE_TEMPLATE/feature_request.yaml

@@ -0,0 +1,52 @@
+name: Feature Request
+description: Suggest a new feature for SkinRestorer
+title: "[Feature Request]: "
+labels: ["enhancement"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        💡 **Before submitting:**
+        - Check existing feature requests for duplicates
+        - Be clear and concise
+        - Explain the *why* and the *how*
+
+  - type: textarea
+    id: description
+    attributes:
+      label: Feature Description
+      description: Detailed description of the feature
+    validations:
+      required: true
+
+  - type: textarea
+    id: motivation
+    attributes:
+      label: Motivation
+      description: Why is this feature needed? What problem does it solve?
+    validations:
+      required: true
+
+  - type: textarea
+    id: use-cases
+    attributes:
+      label: Use Cases
+      description: How would this feature be used and who would benefit?
+    validations:
+      required: true
+
+  - type: textarea
+    id: implementation-ideas
+    attributes:
+      label: Implementation Ideas (Optional)
+      description: Any thoughts on how it could be implemented?
+    validations:
+      required: false
+
+  - type: checkboxes
+    id: confirmations
+    attributes:
+      label: Confirmations
+      options:
+        - label: I've checked for existing feature requests
+          required: true

.github/workflows/release.yml

@@ -1,8 +1,5 @@
 name: release
 on:
-    push:
-        tags:
-            - "v**"
     workflow_dispatch:
 
 jobs:

.gitignore

@@ -30,3 +30,4 @@ bin/
 
 .architectury-transformer/
 run/
+scripts/

CHANGELOG.md

@@ -4,6 +4,78 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [2.5.0] - 2026-01-14
+### Added
+- Added collection skin provider (allows assigning random skins from a predefined set)
+- Added `forceFirstJoinSkinFetch` config option to force skin fetch on first join even if player already has a skin
+
+## [2.4.3] - 2025-07-25
+### Fixed
+- Fixed crash on client when loading player head skin (fixes [#63](https://github.com/Suiranoil/SkinRestorer/issues/63) and [#64](https://github.com/Suiranoil/SkinRestorer/issues/64))
+- Fixed server freeze when loading player head skin
+
+## [2.4.2] - 2025-07-13
+### Fixed
+- Fix crash when head profile name is null (fixes [#60](https://github.com/Suiranoil/SkinRestorer/issues/60) and [#61](https://github.com/Suiranoil/SkinRestorer/issues/61))
+
+## [2.4.1] - 2025-07-09
+### Changed
+- Log full exception and argument when unable to fetch/set skin
+### Fixed
+- Fixed mojang provider using offline uuids when unable to fetch actual uuid resulting in `no profile with uuid` error
+
+## [2.4.0] - 2025-07-05
+### Fixed
+- Added support for player heads
+
+## [2.3.5] - 2025-06-21
+### Fixed
+- Fix mod not loading on client
+
+## [2.3.4] - 2025-06-19
+### Added
+- Added support for minecraft 1.21.6
+
+## [2.3.3] - 2025-06-01
+### Fixed
+- Fixed forge mixin crash (closes [#54](https://github.com/Suiranoil/SkinRestorer/issues/53))
+### Removed
+- Removed minecraft 1.19 support
+
+## [2.3.2] - 2025-05-24
+### Fixed
+- Fixed mixin incompatibility with ModernFix (closes [#42](https://github.com/Suiranoil/SkinRestorer/issues/52))
+
+## [2.3.1] - 2025-05-03
+### Added
+- Added support for minecraft 1.19-1.19.4
+### Changed
+- Use services and session server urls from environment
+
+## [2.3.0] - 2025-03-27
+### Added
+- Added `skinApplyDelayOnJoin` config option (see [wiki](https://github.com/Suiranoil/SkinRestorer/wiki/Configuration#skinapplydelayonjoin))
+### Changed
+- Updated to 1.21.5
+### Removed
+- [NeoForge] Dropped support for NeoForge on Minecraft 1.20.5-1.20.6
+
+## [2.2.1] - 2024-12-23
+### Fixed
+- Fixed game not closing because of mineskin working threads (closes [#41](https://github.com/Suiranoil/SkinRestorer/issues/41))
+
+## [2.2.0] - 2024-12-02
+### Added
+- Added support for [SkinShuffle](https://modrinth.com/mod/skinshuffle) clients (requires FabricAPI on Fabric)
+  (closes [#34](https://github.com/Suiranoil/SkinRestorer/issues/34))
+- Added `providers.mineskin.apiKey` config option (see [wiki](https://github.com/Suiranoil/SkinRestorer/wiki/Configuration#providersmineskin))
+### Changed
+- Migrated to MineSkin's new API V2
+### Fixed
+- Fixed `providers` config validation
+### Removed
+- Dropped support for NeoForge on Minecraft 1.20.2-1.20.4
+
 ## [2.1.0] - 2024-09-26
 ### Added
 - Added `config reload` command for dynamic configuration updates

CHANGELOG_LATEST.md

@@ -1,9 +1,3 @@
 ### Added
-- Added `config reload` command for dynamic configuration updates
-- Added `refreshSkinOnJoin` config option (see [wiki](https://github.com/Suiranoil/SkinRestorer/wiki/Configuration#refreshskinonjoin))
-- Implemented caching for skin providers
-- Added provider configurations (see [wiki](https://github.com/Suiranoil/SkinRestorer/wiki/Configuration#providers))
-- Added username and url validation for requests
-### Fixed
-- Fixed old skin directory migration not working
-- Prevented overwriting existing skin files during migration
+- Added collection skin provider (allows assigning random skins from a predefined set) (see [wiki](https://github.com/Suiranoil/SkinRestorer/wiki/Configuration#providerscollection))
+- Added `forceFirstJoinSkinFetch` config option to force skin fetch on first join even if player already has a skin (see [wiki](https://github.com/Suiranoil/SkinRestorer/wiki/Configuration#forcefirstjoinskinfetch))

README.md

@@ -1,7 +1,7 @@
 # SkinRestorer
 
-<a href="https://modrinth.com/mod/skinrestorer"><img src="https://raw.githubusercontent.com/Suiranoil/badges/main/assets/minecraft/platform/modrinth/mini/badge.svg" alt="Modrinth" height="32"></a>
-<a href="https://www.curseforge.com/minecraft/mc-mods/skinrestorer"><img src="https://raw.githubusercontent.com/Suiranoil/badges/main/assets/minecraft/platform/curseforge/mini/badge.svg" alt="CurseForge" height="32"></a>
+<a href="https://modrinth.com/mod/skinrestorer"><img src="https://raw.githubusercontent.com/Suiranoil/badges/main/assets/minecraft/platform/modrinth/mini/badge.svg" alt="Modrinth"></a>
+<a href="https://www.curseforge.com/minecraft/mc-mods/skinrestorer"><img src="https://raw.githubusercontent.com/Suiranoil/badges/main/assets/minecraft/platform/curseforge/mini/badge.svg" alt="CurseForge"></a>
 
 A server-side mod for managing and restoring player skins.
 
@@ -9,26 +9,36 @@ A server-side mod for managing and restoring player skins.
 
 - **Set skins from Mojang Account**: Fetch and apply skins using a valid Minecraft username.
 - **Set skins from Ely.by**: Fetch and apply skins using a valid [Ely.by](https://ely.by/) username.
-- **Set skins from URL**: Fetch and apply skins from any image URL, supporting both classic (Steve) and slim (Alex) skin models.
-- **Automatic skin fetching**: Automatically fetch skin from Mojang/Ely.by when a player joins the server running in offline/insecure mode ([configurable](https://github.com/Suiranoil/SkinRestorer/wiki/Configuration)).
+- **Set skins from URL**: Fetch and apply skins from any image URL, supporting both classic (Steve) and slim (Alex) skin
+  models.
+- **Automatic skin fetching**: Automatically fetch skin from Mojang/Ely.by when a player joins the server running in
+  offline/insecure mode ([configurable](https://github.com/Suiranoil/SkinRestorer/wiki/Configuration)).
 - **Singleplayer support**: Apply skins individually for each world.
 - **Permissions API support**
+- **SkinShuffle support**: Allow players with [SkinShuffle](https://modrinth.com/mod/skinshuffle) installed to apply skins using GUI.
 
 ## 📜 Command Usage Guide
 
-For a detailed list of available commands and their usage, please visit the [commands wiki page](https://github.com/Suiranoil/SkinRestorer/wiki/Commands).
+For a detailed list of available commands and their usage, please visit
+the [commands wiki page](https://github.com/Suiranoil/SkinRestorer/wiki/Commands).
 
 ## ❌ Known Incompatibilities
 
-- **[Arclight](https://github.com/IzzelAliz/Arclight) (<=1.20.1)**: Trials or older versions are not compatible due to mixin conflicts.
+- **[Arclight](https://github.com/IzzelAliz/Arclight) (<=1.20.1)**: Trials or older versions are not compatible due to
+  mixin conflicts.
   As an alternative, consider using the [SkinsRestorer](https://www.spigotmc.org/resources/skinsrestorer.2124/) plugin.
 
 ## 🪙 Donation
 
-If you enjoy using **SkinRestorer** and would like to support its development, you can contribute through cryptocurrency donations.
+If you enjoy using **SkinRestorer** and would like to support its development, you can contribute through the following
+platforms:
 
-Bitcoin (BTC): `1Ndbwny8pxdnWXFgadp95fp97y5JqMJKTX`\
-USDT (TRC20): `TGXn8wrqku5KLzwPWQAeH7wgnV4UzwHEae`\
+<a href="https://ko-fi.com/lionarius"><img src="https://raw.githubusercontent.com/Suiranoil/badges/main/assets/donation/kofi/mini/badge.svg" alt="Ko-fi" height="32"></a>
+
+<a href="https://boosty.to/lionarius"><img src="https://raw.githubusercontent.com/Suiranoil/badges/main/assets/donation/boosty/mini/badge.svg" alt="Boosty" height="32"></a>
+
+Bitcoin (BTC): `1Ndbwny8pxdnWXFgadp95fp97y5JqMJKTX`  
+USDT (TRC20): `TGXn8wrqku5KLzwPWQAeH7wgnV4UzwHEae`  
 USDT (TON): `UQAQF18Xlmx-V1oZ90C2YOju5qI7q1LgrCP5QaIUhqIELmDS`
 
 Thank you for your generosity!

build.gradle

@@ -1,13 +1,29 @@
 plugins {
     // see https://fabricmc.net/develop/ for new versions
-    id 'fabric-loom' version '1.7-SNAPSHOT' apply false
-    // see https://projects.neoforged.net/neoforged/neogradle for new versions
-    id 'net.neoforged.gradle.userdev' version '7.0.153' apply false
+    id 'fabric-loom' version '1.10-SNAPSHOT' apply false
+    // see https://projects.neoforged.net/neoforged/moddevgradle for new versions
+    id 'net.neoforged.moddev' version '2.0.+' apply false
     // see https://files.minecraftforge.net/net/minecraftforge/gradle/ForgeGradle/ for new versions
-    id 'net.minecraftforge.gradle' version '6.0.26' apply false
+    id 'net.minecraftforge.gradle' version '6.0.+' apply false
     id 'org.parchmentmc.librarian.forgegradle' version '1.+' apply false
 
     id 'org.spongepowered.mixin' version '0.7-SNAPSHOT' apply false
 
-    id 'me.modmuss50.mod-publish-plugin' version '0.6.3' apply false
+    id 'me.modmuss50.mod-publish-plugin' version '0.8.+' apply false
+}
+
+allprojects {
+    repositories {
+        exclusiveContent {
+            forRepository {
+                maven {
+                    name = 'lionarius-repository'
+                    url = 'https://reposilite.lionarius.ru/releases'
+                }
+            }
+            filter {
+                includeGroupAndSubgroups('org.mineskin')
+            }
+        }
+    }
 }

buildSrc/src/main/groovy/multiloader-common.gradle

@@ -83,7 +83,6 @@ processResources {
             'group'                        : project.group, //Else we target the task's group.
             'minecraft_version'            : minecraft_version,
             'minecraft_version_range'      : minecraft_version_range,
-            'fabric_loader_version'        : fabric_loader_version,
             'mod_name'                     : mod_name,
             'mod_author'                   : mod_author,
             'mod_id'                       : mod_id,
@@ -92,16 +91,20 @@ processResources {
             'mod_issues'                   : mod_issues,
             'license'                      : license,
             'description'                  : project.description,
-            'forge_version'                : forge_version,
-            'forge_loader_version_range'   : forge_loader_version_range,
-            'neoforge_version'             : neoforge_version,
-            'neoforge_loader_version_range': neoforge_loader_version_range,
             'credits'                      : credits,
-            'java_version'                 : java_version
+            'java_version'                 : java_version,
+            
+            // Loader specific properties
+            'fabric_loader_version'        : project.hasProperty('fabric_loader_version') ? fabric_loader_version : '',
+            'forge_version'                : project.hasProperty('forge_version') ? forge_version : '',
+            'forge_loader_version_range'   : project.hasProperty('forge_loader_version_range') ? forge_loader_version_range : '',
+            'neoforge_version'             : project.hasProperty('neoforge_version') ? neoforge_version : '',
+            'neoforge_loader_version_range': project.hasProperty('neoforge_loader_version_range') ? neoforge_loader_version_range : ''
     ]
 
     filesMatching(['pack.mcmeta', 'fabric.mod.json', 'META-INF/mods.toml', 'META-INF/neoforge.mods.toml', '*.mixins.json']) {
         expand expandProps
     }
+
     inputs.properties(expandProps)
 }

buildSrc/src/main/groovy/multiloader-loader.gradle

@@ -3,10 +3,10 @@ plugins {
 }
 
 configurations {
-    commonJava{
+    commonJava {
         canBeResolved = true
     }
-    commonResources{
+    commonResources {
         canBeResolved = true
     }
 }

buildSrc/src/main/groovy/multiloader-publish.gradle

@@ -3,12 +3,17 @@ plugins {
 }
 
 publishMods {
-    if (project.name == 'fabric')
-        file = remapJar.archiveFile
-    else
-        file = jar.archiveFile
+    file = project.layout.buildDirectory.file("libs/${project.archivesBaseName}-${project.version}.jar").map { it.asFile }.getOrNull()
 
     modLoaders.add(project.name)
+
+    if (project.hasProperty('additional_modloaders') && !additional_modloaders.isEmpty())
+    {
+        def loaders = additional_modloaders.split(',')
+        for (loader in loaders)
+            modLoaders.add(loader)
+    }
+    
     type = STABLE
     version = project.version
     displayName = "[${project.name.capitalize()}] ${mod_name} ${mod_version}"
@@ -22,6 +27,9 @@ publishMods {
 
         minecraftVersions.addAll(minecraft_version_list.split(','))
         serverRequired = true
+
+        if (project.hasProperty('optional_dependencies') && !optional_dependencies.isEmpty())
+            optional(optional_dependencies.split(','))
     }
 
     modrinth {
@@ -31,5 +39,8 @@ publishMods {
         accessToken = providers.environmentVariable("MODRINTH_TOKEN")
 
         minecraftVersions.addAll(minecraft_version_list.split(','))
+
+        if (project.hasProperty('optional_dependencies') && !optional_dependencies.isEmpty())
+            optional(optional_dependencies.split(','))
     }
 }

common/build.gradle

@@ -1,6 +1,6 @@
 plugins {
     id 'multiloader-common'
-    
+
     id 'fabric-loom'
 }
 
@@ -11,6 +11,8 @@ dependencies {
         parchment("org.parchmentmc.data:parchment-${parchment_minecraft}:${parchment_version}@zip")
     }
     compileOnly group: 'org.spongepowered', name: 'mixin', version: '0.8.5'
+
+    implementation("org.mineskin:java-client:${mineskin_client_version}")
 }
 
 loom {
@@ -18,7 +20,7 @@ loom {
     if (aw.exists()) {
         accessWidenerPath.set(aw)
     }
-    
+
     mixin {
         useLegacyMixinAp = false
     }

common/gradle.properties

@@ -1 +1 @@
-fabric.loom.dontRemap = true
+fabric.loom.dontRemap=true

common/src/main/java/net/lionarius/skinrestorer/SkinRestorer.java

@@ -1,26 +1,29 @@
 package net.lionarius.skinrestorer;
 
+import com.google.common.base.Throwables;
 import com.mojang.authlib.GameProfile;
-import net.lionarius.skinrestorer.config.BuiltInProviderConfig;
+import com.mojang.brigadier.CommandDispatcher;
+import net.lionarius.skinrestorer.command.SkinCommand;
 import net.lionarius.skinrestorer.config.Config;
+import net.lionarius.skinrestorer.config.provider.BuiltInProviderConfig;
+import net.lionarius.skinrestorer.exception.TransparentException;
 import net.lionarius.skinrestorer.platform.Services;
 import net.lionarius.skinrestorer.skin.SkinIO;
 import net.lionarius.skinrestorer.skin.SkinStorage;
 import net.lionarius.skinrestorer.skin.SkinValue;
 import net.lionarius.skinrestorer.skin.provider.*;
 import net.lionarius.skinrestorer.translation.Translation;
-import net.lionarius.skinrestorer.util.FileUtils;
-import net.lionarius.skinrestorer.util.PlayerUtils;
-import net.lionarius.skinrestorer.util.Result;
-import net.lionarius.skinrestorer.util.WebUtils;
+import net.lionarius.skinrestorer.util.*;
+import net.minecraft.commands.CommandSourceStack;
+import net.minecraft.resources.ResourceLocation;
 import net.minecraft.server.MinecraftServer;
 import net.minecraft.server.level.ServerPlayer;
 import net.minecraft.world.level.storage.LevelResource;
+import org.jetbrains.annotations.Nullable;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 import java.nio.file.Path;
-import java.util.Arrays;
 import java.util.Collection;
 import java.util.HashSet;
 import java.util.Optional;
@@ -34,6 +37,8 @@ public final class SkinRestorer {
     private static SkinStorage skinStorage;
     private static Path configDir;
     private static Config config;
+    private static TickedScheduler tickedScheduler;
+    private static MinecraftServer minecraftServer;
     
     private SkinRestorer() {}
     
@@ -53,48 +58,56 @@ public final class SkinRestorer {
         return SkinRestorer.providersRegistry;
     }
     
+    public static TickedScheduler getTickedScheduler() {
+        return SkinRestorer.tickedScheduler;
+    }
+    
+    public static @Nullable MinecraftServer getMinecraftServer() {
+        return SkinRestorer.minecraftServer;
+    }
+    
     public static Optional<SkinProvider> getProvider(String name) {
         return Optional.ofNullable(SkinRestorer.providersRegistry.get(name));
     }
     
+    public static ResourceLocation resourceLocation(String name) {
+        return ResourceLocation.fromNamespaceAndPath(SkinRestorer.MOD_ID, name);
+    }
+    
+    public static String assetPath(String name) {
+        return String.format("/assets/%s/%s", SkinRestorer.MOD_ID, name);
+    }
+    
     public static void onInitialize() {
         SkinRestorer.configDir = Services.PLATFORM.getConfigDirectory().resolve(SkinRestorer.MOD_ID);
         SkinRestorer.reloadConfig();
         
         SkinRestorer.providersRegistry.register(EmptySkinProvider.PROVIDER_NAME, SkinProvider.EMPTY, false);
+        SkinRestorer.providersRegistry.register(SkinShuffleSkinProvider.PROVIDER_NAME, SkinProvider.SKIN_SHUFFLE, false);
         
         SkinRestorer.registerDefaultSkinProvider(MojangSkinProvider.PROVIDER_NAME, SkinProvider.MOJANG, SkinRestorer.getConfig().providersConfig().mojang());
         SkinRestorer.registerDefaultSkinProvider(ElyBySkinProvider.PROVIDER_NAME, SkinProvider.ELY_BY, SkinRestorer.getConfig().providersConfig().ely_by());
         SkinRestorer.registerDefaultSkinProvider(MineskinSkinProvider.PROVIDER_NAME, SkinProvider.MINESKIN, SkinRestorer.getConfig().providersConfig().mineskin());
+        SkinRestorer.registerDefaultSkinProvider(CollectionSkinProvider.PROVIDER_NAME, SkinProvider.COLLECTION, SkinRestorer.getConfig().providersConfig().collection());
     }
     
     private static void registerDefaultSkinProvider(String defaultName, SkinProvider provider, BuiltInProviderConfig config) {
         var isDefaultName = config.name().equals(defaultName);
         SkinRestorer.providersRegistry.register(defaultName, provider, config.enabled() && isDefaultName);
         
-        if (!isDefaultName && Arrays.stream(SkinProvider.BUILTIN_PROVIDER_NAMES).noneMatch(name -> name.equals(config.name())))
+        if (!isDefaultName && !SkinProvider.BUILTIN_PROVIDER_NAMES.contains(config.name()))
             SkinRestorer.providersRegistry.register(config.name(), provider, config.enabled());
     }
     
-    public static void onServerStarted(MinecraftServer server) {
-        Path worldSkinDirectory = server.getWorldPath(LevelResource.ROOT).resolve(SkinRestorer.MOD_ID);
-        FileUtils.tryMigrateOldSkinDirectory(SkinRestorer.getConfigDir(), worldSkinDirectory);
-        
-        SkinRestorer.skinStorage = new SkinStorage(new SkinIO(worldSkinDirectory));
-    }
-    
     public static void reloadConfig() {
         SkinRestorer.config = Config.load(SkinRestorer.getConfigDir());
         Translation.reloadTranslations();
         WebUtils.recreateHttpClient();
         
-        MojangSkinProvider.createCache();
-        ElyBySkinProvider.createCache();
-        MineskinSkinProvider.createCache();
-    }
-    
-    public static String assetPath(String name) {
-        return String.format("/assets/%s/%s", SkinRestorer.MOD_ID, name);
+        MojangSkinProvider.reload();
+        ElyBySkinProvider.reload();
+        MineskinSkinProvider.reload();
+        CollectionSkinProvider.reload();
     }
     
     public static Collection<ServerPlayer> applySkin(MinecraftServer server, Iterable<GameProfile> targets, SkinValue value, boolean save) {
@@ -104,12 +117,12 @@ public final class SkinRestorer {
             if (!SkinRestorer.getSkinStorage().hasSavedSkin(profile.getId()))
                 value = value.setOriginalValue(PlayerUtils.getPlayerSkin(profile));
             
-            if (save)
-                SkinRestorer.getSkinStorage().setSkin(profile.getId(), value);
-            
             if (PlayerUtils.areSkinPropertiesEquals(value.value(), PlayerUtils.getPlayerSkin(profile)))
                 continue;
             
+            if (save)
+                SkinRestorer.getSkinStorage().setSkin(profile.getId(), value);
+            
             PlayerUtils.applyRestoredSkin(profile, value.value());
             
             var player = server.getPlayerList().getPlayer(profile.getId());
@@ -118,6 +131,8 @@ public final class SkinRestorer {
             
             PlayerUtils.refreshPlayer(player);
             acceptedPlayers.add(player);
+            
+            SkinRestorer.getTickedScheduler().cancel(player.getUUID());
         }
         
         return acceptedPlayers;
@@ -142,7 +157,7 @@ public final class SkinRestorer {
                     
                     var skinResult = result.get();
                     if (skinResult.isError())
-                        return Result.<Collection<ServerPlayer>, String>error(skinResult.getErrorValue().getMessage());
+                        throw new TransparentException(Throwables.getRootCause(skinResult.getErrorValue()));
                     
                     var skinValue = SkinValue.fromProviderContextWithValue(context, skinResult.getSuccessValue().orElse(null));
                     
@@ -151,8 +166,37 @@ public final class SkinRestorer {
                     return Result.<Collection<ServerPlayer>, String>success(acceptedPlayers);
                 }, server)
                 .exceptionally(e -> {
-                    SkinRestorer.LOGGER.error(e.toString());
+                    SkinRestorer.LOGGER.error("Failed to set skin '{}:{}'", context.name(), context.argument(), e);
                     return Result.error(e.getMessage());
                 });
     }
+    
+    public static class Events {
+        private Events() {}
+        
+        public static void onServerStarted(MinecraftServer server) {
+            Path worldSkinDirectory = server.getWorldPath(LevelResource.ROOT).resolve(SkinRestorer.MOD_ID);
+            FileUtils.tryMigrateOldSkinDirectory(SkinRestorer.getConfigDir(), worldSkinDirectory);
+            
+            SkinRestorer.skinStorage = new SkinStorage(new SkinIO(worldSkinDirectory));
+            SkinRestorer.tickedScheduler = new TickedScheduler(server);
+            server.addTickable(SkinRestorer.tickedScheduler);
+            
+            SkinRestorer.minecraftServer = server;
+        }
+        
+        public static void onServerStopped(MinecraftServer server) {
+            SkinRestorer.skinStorage = null;
+            SkinRestorer.tickedScheduler = null;
+            SkinRestorer.minecraftServer = null;
+        }
+        
+        public static void onCommandRegister(CommandDispatcher<CommandSourceStack> dispatcher) {
+            SkinCommand.register(dispatcher);
+        }
+        
+        public static void onPlayerDisconnect(ServerPlayer player) {
+            SkinRestorer.getSkinStorage().removeSkin(player.getUUID());
+        }
+    }
 }

common/src/main/java/net/lionarius/skinrestorer/command/SkinCommand.java

@@ -34,7 +34,7 @@ public final class SkinCommand {
     private SkinCommand() {}
     
     public static void register(CommandDispatcher<CommandSourceStack> dispatcher) {
-        LiteralArgumentBuilder<CommandSourceStack> base =
+        var base =
                 literal("skin")
                         .then(buildSetSubcommand("clear", SkinValue.EMPTY::toProviderContext))
                         .then(literal("reset")
@@ -44,7 +44,7 @@ public final class SkinCommand {
                                 )))
                         .then(literal("refresh").executes(context -> refreshSubcommand(context.getSource())));
         
-        LiteralArgumentBuilder<CommandSourceStack> set = literal("set");
+        var set = literal("set");
         
         var providers = SkinRestorer.getProvidersRegistry().getPublicProviders();
         for (var entry : providers)
@@ -92,7 +92,7 @@ public final class SkinCommand {
             Collection<GameProfile> targets,
             boolean setByOperator
     ) {
-        Collection<ServerPlayer> updatedPlayers = new HashSet<>();
+        var updatedPlayers = new HashSet<ServerPlayer>();
         for (var profile : targets) {
             SkinValue skin = null;
             if (SkinRestorer.getSkinStorage().hasSavedSkin(profile.getId()))
@@ -199,7 +199,7 @@ public final class SkinCommand {
     }
     
     private static LiteralArgumentBuilder<CommandSourceStack> buildSetSubcommand(String name, SkinProvider provider) {
-        LiteralArgumentBuilder<CommandSourceStack> action = literal(name);
+        var action = literal(name);
         
         if (provider.hasVariantSupport()) {
             for (SkinVariant variant : SkinVariant.values()) {

common/src/main/java/net/lionarius/skinrestorer/compat/skinshuffle/SkinShuffleCompatibility.java

@@ -0,0 +1,55 @@
+package net.lionarius.skinrestorer.compat.skinshuffle;
+
+import net.lionarius.skinrestorer.SkinRestorer;
+import net.lionarius.skinrestorer.platform.Services;
+import net.lionarius.skinrestorer.skin.SkinValue;
+import net.lionarius.skinrestorer.skin.provider.SkinShuffleSkinProvider;
+import net.lionarius.skinrestorer.util.PlayerUtils;
+import net.minecraft.resources.ResourceLocation;
+import net.minecraft.server.MinecraftServer;
+import net.minecraft.server.level.ServerPlayer;
+
+import java.util.Collections;
+
+public class SkinShuffleCompatibility {
+    
+    public static final String MOD_ID = "skinshuffle";
+    
+    private static final boolean SHOULD_APPLY = !Services.PLATFORM.isModLoaded(SkinShuffleCompatibility.MOD_ID);
+    
+    private SkinShuffleCompatibility() {}
+    
+    public static boolean shouldApply() {
+        return SkinShuffleCompatibility.SHOULD_APPLY;
+    }
+    
+    public static ResourceLocation resourceLocation(String name) {
+        return ResourceLocation.fromNamespaceAndPath(SkinShuffleCompatibility.MOD_ID, name);
+    }
+    
+    public static void onPlayerJoin(ServerPlayer player) {
+        Services.COMPATIBILITY.skinShuffle_sendHandshake(player);
+    }
+    
+    public static void handleSkinRefresh(MinecraftServer server, ServerPlayer player, SkinShuffleSkinRefreshPayload payload) {
+        var property = payload.textureProperty();
+        
+        if (!property.name().equals(PlayerUtils.TEXTURES_KEY))
+            return;
+        
+        if (!property.hasSignature())
+            return;
+        
+        server.execute(() -> {
+            SkinRestorer.applySkin(
+                    server,
+                    Collections.singleton(player.getGameProfile()),
+                    new SkinValue(SkinShuffleSkinProvider.PROVIDER_NAME, null, null, property),
+                    !server.usesAuthentication()
+            );
+            
+            if (server.usesAuthentication() && SkinRestorer.getSkinStorage().hasSavedSkin(player.getUUID()))
+                SkinRestorer.getSkinStorage().deleteSkin(player.getUUID());
+        });
+    }
+}

common/src/main/java/net/lionarius/skinrestorer/compat/skinshuffle/SkinShuffleHandshakePayload.java

@@ -0,0 +1,19 @@
+package net.lionarius.skinrestorer.compat.skinshuffle;
+
+import net.minecraft.network.FriendlyByteBuf;
+import net.minecraft.network.codec.StreamCodec;
+import net.minecraft.network.protocol.common.custom.CustomPacketPayload;
+import org.jetbrains.annotations.NotNull;
+
+public record SkinShuffleHandshakePayload() implements CustomPacketPayload {
+    
+    public static final SkinShuffleHandshakePayload INSTANCE = new SkinShuffleHandshakePayload();
+    
+    public static final CustomPacketPayload.Type<SkinShuffleHandshakePayload> PACKET_ID = new CustomPacketPayload.Type<>(SkinShuffleCompatibility.resourceLocation("handshake"));
+    public static final StreamCodec<FriendlyByteBuf, SkinShuffleHandshakePayload> PACKET_CODEC = StreamCodec.unit(INSTANCE);
+    
+    @Override
+    public CustomPacketPayload.@NotNull Type<? extends CustomPacketPayload> type() {
+        return PACKET_ID;
+    }
+}

common/src/main/java/net/lionarius/skinrestorer/compat/skinshuffle/SkinShuffleSkinRefreshPayload.java

@@ -0,0 +1,7 @@
+package net.lionarius.skinrestorer.compat.skinshuffle;
+
+import com.mojang.authlib.properties.Property;
+
+public interface SkinShuffleSkinRefreshPayload {
+    Property textureProperty();
+}

common/src/main/java/net/lionarius/skinrestorer/compat/skinshuffle/SkinShuffleSkinRefreshV1Payload.java

@@ -0,0 +1,34 @@
+package net.lionarius.skinrestorer.compat.skinshuffle;
+
+import com.mojang.authlib.properties.Property;
+import net.minecraft.network.FriendlyByteBuf;
+import net.minecraft.network.codec.StreamCodec;
+import net.minecraft.network.protocol.common.custom.CustomPacketPayload;
+import org.jetbrains.annotations.NotNull;
+
+public record SkinShuffleSkinRefreshV1Payload(
+        Property textureProperty) implements CustomPacketPayload, SkinShuffleSkinRefreshPayload {
+    
+    public static final CustomPacketPayload.Type<SkinShuffleSkinRefreshV1Payload> PACKET_ID = new CustomPacketPayload.Type<>(SkinShuffleCompatibility.resourceLocation("refresh"));
+    public static final StreamCodec<FriendlyByteBuf, SkinShuffleSkinRefreshV1Payload> PACKET_CODEC = StreamCodec.of(
+            SkinShuffleSkinRefreshV1Payload::encode,
+            SkinShuffleSkinRefreshV1Payload::decode
+    );
+    
+    public static void encode(FriendlyByteBuf buf, SkinShuffleSkinRefreshV1Payload value) {
+        var textureProperty = value.textureProperty();
+        
+        buf.writeUtf(textureProperty.name());
+        buf.writeUtf(textureProperty.value());
+        buf.writeNullable(textureProperty.signature(), FriendlyByteBuf::writeUtf);
+    }
+    
+    public static SkinShuffleSkinRefreshV1Payload decode(FriendlyByteBuf buf) {
+        return new SkinShuffleSkinRefreshV1Payload(new Property(buf.readUtf(), buf.readUtf(), buf.readNullable(FriendlyByteBuf::readUtf)));
+    }
+    
+    @Override
+    public @NotNull CustomPacketPayload.Type<? extends CustomPacketPayload> type() {
+        return PACKET_ID;
+    }
+}

common/src/main/java/net/lionarius/skinrestorer/compat/skinshuffle/SkinShuffleSkinRefreshV2Payload.java

@@ -0,0 +1,42 @@
+package net.lionarius.skinrestorer.compat.skinshuffle;
+
+import com.mojang.authlib.properties.Property;
+import net.minecraft.network.FriendlyByteBuf;
+import net.minecraft.network.codec.StreamCodec;
+import net.minecraft.network.protocol.common.custom.CustomPacketPayload;
+import org.jetbrains.annotations.NotNull;
+
+public record SkinShuffleSkinRefreshV2Payload(
+        Property textureProperty) implements CustomPacketPayload, SkinShuffleSkinRefreshPayload {
+    
+    public static final CustomPacketPayload.Type<SkinShuffleSkinRefreshV2Payload> PACKET_ID = new CustomPacketPayload.Type<>(SkinShuffleCompatibility.resourceLocation("skin_refresh"));
+    public static final StreamCodec<FriendlyByteBuf, SkinShuffleSkinRefreshV2Payload> PACKET_CODEC = StreamCodec.of(
+            SkinShuffleSkinRefreshV2Payload::encode,
+            SkinShuffleSkinRefreshV2Payload::decode
+    );
+    
+    public static void encode(FriendlyByteBuf buf, SkinShuffleSkinRefreshV2Payload value) {
+        var textureProperty = value.textureProperty();
+        
+        buf.writeBoolean(textureProperty.hasSignature());
+        buf.writeUtf(textureProperty.name());
+        buf.writeUtf(textureProperty.value());
+        if (textureProperty.hasSignature()) {
+            assert textureProperty.signature() != null;
+            
+            buf.writeUtf(textureProperty.signature());
+        }
+    }
+    
+    public static SkinShuffleSkinRefreshV2Payload decode(FriendlyByteBuf buf) {
+        if (buf.readBoolean()) {
+            return new SkinShuffleSkinRefreshV2Payload(new Property(buf.readUtf(), buf.readUtf(), buf.readUtf()));
+        }
+        return new SkinShuffleSkinRefreshV2Payload(new Property(buf.readUtf(), buf.readUtf(), null));
+    }
+    
+    @Override
+    public @NotNull CustomPacketPayload.Type<? extends CustomPacketPayload> type() {
+        return PACKET_ID;
+    }
+}

common/src/main/java/net/lionarius/skinrestorer/config/BuiltInProviderConfig.java

@@ -1,7 +0,0 @@
-package net.lionarius.skinrestorer.config;
-
-public record BuiltInProviderConfig(boolean enabled, String name, CacheConfig cache) {
-    public boolean isValid() {
-        return this.name != null && this.cache != null && !this.name.isEmpty() && this.cache.isValid();
-    }
-}

common/src/main/java/net/lionarius/skinrestorer/config/CacheConfig.java

@@ -1,7 +0,0 @@
-package net.lionarius.skinrestorer.config;
-
-public record CacheConfig(boolean enabled, long duration) {
-    public boolean isValid() {
-        return this.duration > 0;
-    }
-}

common/src/main/java/net/lionarius/skinrestorer/config/Config.java

@@ -1,13 +1,15 @@
 package net.lionarius.skinrestorer.config;
 
 import net.lionarius.skinrestorer.SkinRestorer;
+import net.lionarius.skinrestorer.config.provider.ProvidersConfig;
 import net.lionarius.skinrestorer.util.FileUtils;
 import net.lionarius.skinrestorer.util.JsonUtils;
+import net.lionarius.skinrestorer.util.gson.GsonPostProcessable;
 
 import java.nio.file.Path;
 import java.util.Optional;
 
-public final class Config {
+public final class Config implements GsonPostProcessable {
     
     public static final String CONFIG_FILENAME = "config.json";
     
@@ -16,8 +18,12 @@ public final class Config {
     
     private boolean refreshSkinOnJoin = true;
     
+    private int skinApplyDelayOnJoin = 0;
+    
     private boolean fetchSkinOnFirstJoin = true;
     
+    private boolean forceFirstJoinSkinFetch = false;
+    
     private FirstJoinSkinProvider firstJoinSkinProvider = FirstJoinSkinProvider.MOJANG;
     
     private String proxy = "";
@@ -35,10 +41,18 @@ public final class Config {
         return this.refreshSkinOnJoin;
     }
     
+    public int skinApplyDelayOnJoin() {
+        return this.skinApplyDelayOnJoin;
+    }
+    
     public boolean fetchSkinOnFirstJoin() {
         return this.fetchSkinOnFirstJoin;
     }
     
+    public boolean forceFirstJoinSkinFetch() {
+        return this.forceFirstJoinSkinFetch;
+    }
+    
     public FirstJoinSkinProvider firstJoinSkinProvider() {
         return this.firstJoinSkinProvider;
     }
@@ -68,19 +82,23 @@ public final class Config {
         if (config == null)
             config = new Config();
         
-        config.verifyAndFix();
-        
         FileUtils.writeFile(path.resolve(Config.CONFIG_FILENAME), JsonUtils.toJson(config));
         
         return config;
     }
     
-    private void verifyAndFix() {
+    @Override
+    public void gsonPostProcess() {
         if (this.language == null || this.language.isEmpty()) {
             SkinRestorer.LOGGER.warn("Language config is null or empty, defaulting to 'en_us'");
             this.language = "en_us";
         }
         
+        if (this.skinApplyDelayOnJoin < 0) {
+            SkinRestorer.LOGGER.warn("SkinApplyDelayOnJoin config is less than 0, defaulting to 0");
+            this.skinApplyDelayOnJoin = 0;
+        }
+        
         if (this.firstJoinSkinProvider == null) {
             SkinRestorer.LOGGER.warn("FirstJoinSkinProvider config is null, defaulting to MOJANG");
             this.firstJoinSkinProvider = FirstJoinSkinProvider.MOJANG;
@@ -95,7 +113,7 @@ public final class Config {
             try {
                 this.parsedProxy = Proxy.parse(this.proxy);
             } catch (Exception e) {
-                SkinRestorer.LOGGER.warn("Could not parse proxy config", e);
+                SkinRestorer.LOGGER.warn("Could not parse proxy config: {}", e.getMessage());
                 this.parsedProxy = null;
             }
         }
@@ -109,8 +127,5 @@ public final class Config {
             SkinRestorer.LOGGER.warn("Providers config is null, using default");
             this.providers = ProvidersConfig.DEFAULT;
         }
-        
-        if (!this.providers.isValid())
-            this.providers.fix();
     }
 }

common/src/main/java/net/lionarius/skinrestorer/config/FirstJoinSkinProvider.java

@@ -1,6 +1,7 @@
 package net.lionarius.skinrestorer.config;
 
 import com.google.gson.annotations.SerializedName;
+import net.lionarius.skinrestorer.skin.provider.CollectionSkinProvider;
 import net.lionarius.skinrestorer.skin.provider.ElyBySkinProvider;
 import net.lionarius.skinrestorer.skin.provider.MojangSkinProvider;
 
@@ -8,7 +9,9 @@ public enum FirstJoinSkinProvider {
     @SerializedName(value = "MOJANG", alternate = {"mojang"})
     MOJANG(MojangSkinProvider.PROVIDER_NAME),
     @SerializedName(value = "ELY.BY", alternate = {"ely.by", "ELY_BY", "ely_by"})
-    ELY_BY(ElyBySkinProvider.PROVIDER_NAME);
+    ELY_BY(ElyBySkinProvider.PROVIDER_NAME),
+    @SerializedName(value = "COLLECTION", alternate = {"collection"})
+    COLLECTION(CollectionSkinProvider.PROVIDER_NAME);
     
     private final String name;
     

common/src/main/java/net/lionarius/skinrestorer/config/ProvidersConfig.java

@@ -1,65 +0,0 @@
-package net.lionarius.skinrestorer.config;
-
-import net.lionarius.skinrestorer.SkinRestorer;
-import net.lionarius.skinrestorer.skin.provider.ElyBySkinProvider;
-import net.lionarius.skinrestorer.skin.provider.MineskinSkinProvider;
-import net.lionarius.skinrestorer.skin.provider.MojangSkinProvider;
-
-public final class ProvidersConfig {
-    public static final ProvidersConfig DEFAULT = new ProvidersConfig(
-            new BuiltInProviderConfig(true, MojangSkinProvider.PROVIDER_NAME, new CacheConfig(true, 60)),
-            new BuiltInProviderConfig(true, ElyBySkinProvider.PROVIDER_NAME, new CacheConfig(true, 60)),
-            new BuiltInProviderConfig(true, MineskinSkinProvider.PROVIDER_NAME, new CacheConfig(true, 300))
-    );
-    
-    private BuiltInProviderConfig mojang;
-    private BuiltInProviderConfig ely_by;
-    private BuiltInProviderConfig mineskin;
-    
-    public ProvidersConfig(BuiltInProviderConfig mojang, BuiltInProviderConfig ely_by, BuiltInProviderConfig mineskin) {
-        this.mojang = mojang;
-        this.ely_by = ely_by;
-        this.mineskin = mineskin;
-    }
-    
-    public boolean isValid() {
-        if (this == ProvidersConfig.DEFAULT)
-            return true;
-        
-        return this.mojang == null || !this.mojang.isValid()
-               || this.ely_by == null || !this.ely_by.isValid()
-               || this.mineskin == null || !this.mineskin.isValid();
-    }
-    
-    public void fix() {
-        if (this == ProvidersConfig.DEFAULT)
-            return;
-        
-        if (this.mojang == null || !this.mojang.isValid()) {
-            SkinRestorer.LOGGER.warn("Mojang provider config is invalid, using default");
-            this.mojang = ProvidersConfig.DEFAULT.mojang();
-        }
-        
-        if (this.ely_by == null || !this.ely_by.isValid()) {
-            SkinRestorer.LOGGER.warn("Ely.By provider config is invalid, using default");
-            this.ely_by = ProvidersConfig.DEFAULT.ely_by();
-        }
-        
-        if (this.mineskin == null || !this.mineskin.isValid()) {
-            SkinRestorer.LOGGER.warn("Mineskin provider config is invalid, using default");
-            this.mineskin = ProvidersConfig.DEFAULT.mineskin();
-        }
-    }
-    
-    public BuiltInProviderConfig mojang() {
-        return this.mojang;
-    }
-    
-    public BuiltInProviderConfig ely_by() {
-        return this.ely_by;
-    }
-    
-    public BuiltInProviderConfig mineskin() {
-        return this.mineskin;
-    }
-}

common/src/main/java/net/lionarius/skinrestorer/config/provider/BuiltInProviderConfig.java

@@ -0,0 +1,47 @@
+package net.lionarius.skinrestorer.config.provider;
+
+import net.lionarius.skinrestorer.SkinRestorer;
+import net.lionarius.skinrestorer.util.gson.GsonPostProcessable;
+
+public abstract class BuiltInProviderConfig implements GsonPostProcessable {
+    protected boolean enabled;
+    protected String name;
+    protected CacheConfig cache;
+    
+    
+    public BuiltInProviderConfig(String name, CacheConfig cache) {
+        this(name, cache, true);
+    }
+    
+    public BuiltInProviderConfig(String name, CacheConfig cache, boolean enabled) {
+        this.enabled = enabled;
+        this.name = name;
+        this.cache = cache;
+    }
+    
+    public boolean enabled() {
+        return enabled;
+    }
+    
+    public String name() {
+        return name;
+    }
+    
+    public CacheConfig cache() {
+        return cache;
+    }
+    
+    protected void validate(String defaultName, CacheConfig defaultCache) {
+        if (this.name == null || this.name.isEmpty()) {
+            SkinRestorer.LOGGER.warn("Provider name is null or empty, defaulting to '{}'", defaultName);
+            this.name = defaultName;
+        }
+        
+        if (this.cache == null) {
+            SkinRestorer.LOGGER.warn("Provider cache is null, using default");
+            this.cache = defaultCache;
+        } else {
+            this.cache.validate(defaultCache);
+        }
+    }
+}

common/src/main/java/net/lionarius/skinrestorer/config/provider/CacheConfig.java

@@ -0,0 +1,28 @@
+package net.lionarius.skinrestorer.config.provider;
+
+import net.lionarius.skinrestorer.SkinRestorer;
+
+public final class CacheConfig {
+    private boolean enabled;
+    private long duration;
+    
+    public CacheConfig(boolean enabled, long duration) {
+        this.enabled = enabled;
+        this.duration = duration;
+    }
+    
+    public boolean enabled() {
+        return enabled;
+    }
+    
+    public long duration() {
+        return duration;
+    }
+    
+    void validate(CacheConfig defaultValue) {
+        if (this.duration <= 0) {
+            SkinRestorer.LOGGER.warn("Cache duration is less than or equal to zero, defaulting to {}", defaultValue.duration());
+            this.duration = defaultValue.duration();
+        }
+    }
+}

common/src/main/java/net/lionarius/skinrestorer/config/provider/ElyByProviderConfig.java

@@ -0,0 +1,16 @@
+package net.lionarius.skinrestorer.config.provider;
+
+import net.lionarius.skinrestorer.skin.provider.ElyBySkinProvider;
+
+public final class ElyByProviderConfig extends BuiltInProviderConfig {
+    private static final CacheConfig DEFAULT_CACHE_VALUE = new CacheConfig(true, 60);
+    
+    public ElyByProviderConfig() {
+        super(ElyBySkinProvider.PROVIDER_NAME, DEFAULT_CACHE_VALUE);
+    }
+    
+    @Override
+    public void gsonPostProcess() {
+        super.validate(ElyBySkinProvider.PROVIDER_NAME, DEFAULT_CACHE_VALUE);
+    }
+}

common/src/main/java/net/lionarius/skinrestorer/config/provider/MineskinProviderConfig.java

@@ -0,0 +1,30 @@
+package net.lionarius.skinrestorer.config.provider;
+
+import net.lionarius.skinrestorer.SkinRestorer;
+import net.lionarius.skinrestorer.skin.provider.MineskinSkinProvider;
+
+public final class MineskinProviderConfig extends BuiltInProviderConfig {
+    private static final CacheConfig DEFAULT_CACHE_VALUE = new CacheConfig(true, 300);
+    
+    private String apiKey;
+    
+    public MineskinProviderConfig() {
+        super(MineskinSkinProvider.PROVIDER_NAME, DEFAULT_CACHE_VALUE);
+        
+        this.apiKey = "";
+    }
+    
+    public String apiKey() {
+        return apiKey;
+    }
+    
+    @Override
+    public void gsonPostProcess() {
+        super.validate(MineskinSkinProvider.PROVIDER_NAME, DEFAULT_CACHE_VALUE);
+        
+        if (this.apiKey == null) {
+            SkinRestorer.LOGGER.warn("Mineskin API key is null, defaulting to an empty string");
+            this.apiKey = "";
+        }
+    }
+}

common/src/main/java/net/lionarius/skinrestorer/config/provider/MojangProviderConfig.java

@@ -0,0 +1,16 @@
+package net.lionarius.skinrestorer.config.provider;
+
+import net.lionarius.skinrestorer.skin.provider.MojangSkinProvider;
+
+public final class MojangProviderConfig extends BuiltInProviderConfig {
+    private static final CacheConfig DEFAULT_CACHE_VALUE = new CacheConfig(true, 60);
+    
+    public MojangProviderConfig() {
+        super(MojangSkinProvider.PROVIDER_NAME, DEFAULT_CACHE_VALUE);
+    }
+    
+    @Override
+    public void gsonPostProcess() {
+        super.validate(MojangSkinProvider.PROVIDER_NAME, DEFAULT_CACHE_VALUE);
+    }
+}

common/src/main/java/net/lionarius/skinrestorer/config/provider/ProvidersConfig.java

@@ -0,0 +1,65 @@
+package net.lionarius.skinrestorer.config.provider;
+
+import net.lionarius.skinrestorer.SkinRestorer;
+import net.lionarius.skinrestorer.config.provider.collection.CollectionProviderConfig;
+import net.lionarius.skinrestorer.util.gson.GsonPostProcessable;
+
+public final class ProvidersConfig implements GsonPostProcessable {
+    public static final ProvidersConfig DEFAULT = new ProvidersConfig(
+            new MojangProviderConfig(),
+            new ElyByProviderConfig(),
+            new MineskinProviderConfig(),
+            new CollectionProviderConfig()
+    );
+    
+    private MojangProviderConfig mojang;
+    private ElyByProviderConfig ely_by;
+    private MineskinProviderConfig mineskin;
+    private CollectionProviderConfig collection;
+    
+    public ProvidersConfig(MojangProviderConfig mojang, ElyByProviderConfig ely_by, MineskinProviderConfig mineskin, CollectionProviderConfig collection) {
+        this.mojang = mojang;
+        this.ely_by = ely_by;
+        this.mineskin = mineskin;
+        this.collection = collection;
+    }
+    
+    public MojangProviderConfig mojang() {
+        return this.mojang;
+    }
+    
+    public ElyByProviderConfig ely_by() {
+        return this.ely_by;
+    }
+    
+    public MineskinProviderConfig mineskin() {
+        return this.mineskin;
+    }
+    
+    public CollectionProviderConfig collection() {
+        return this.collection;
+    }
+    
+    @Override
+    public void gsonPostProcess() {
+        if (this.mojang == null) {
+            SkinRestorer.LOGGER.warn("Mojang provider config is null, using default");
+            this.mojang = ProvidersConfig.DEFAULT.mojang();
+        }
+        
+        if (this.ely_by == null) {
+            SkinRestorer.LOGGER.warn("Ely.By provider config is null, using default");
+            this.ely_by = ProvidersConfig.DEFAULT.ely_by();
+        }
+        
+        if (this.mineskin == null) {
+            SkinRestorer.LOGGER.warn("Mineskin provider config is null, using default");
+            this.mineskin = ProvidersConfig.DEFAULT.mineskin();
+        }
+        
+        if (this.collection == null) {
+            SkinRestorer.LOGGER.warn("Collection provider config is null, using default");
+            this.collection = ProvidersConfig.DEFAULT.collection();
+        }
+    }
+}

common/src/main/java/net/lionarius/skinrestorer/config/provider/collection/CollectionProviderConfig.java

@@ -0,0 +1,32 @@
+package net.lionarius.skinrestorer.config.provider.collection;
+
+import com.google.gson.annotations.JsonAdapter;
+import net.lionarius.skinrestorer.config.provider.BuiltInProviderConfig;
+import net.lionarius.skinrestorer.config.provider.CacheConfig;
+import net.lionarius.skinrestorer.skin.provider.CollectionSkinProvider;
+import net.lionarius.skinrestorer.util.gson.GsonPostProcessable;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public final class CollectionProviderConfig extends BuiltInProviderConfig implements GsonPostProcessable {
+    private static final CacheConfig DEFAULT_CACHE_VALUE = new CacheConfig(true, 604800);
+    
+    @JsonAdapter(CollectionSkinSourceListDeserializer.class)
+    private List<CollectionSkinSource> sources = new ArrayList<>();
+    
+    public CollectionProviderConfig() {
+        super(CollectionSkinProvider.PROVIDER_NAME, DEFAULT_CACHE_VALUE, false);
+    }
+    
+    public List<CollectionSkinSource> sources() {
+        return this.sources;
+    }
+    
+    @Override
+    public void gsonPostProcess() {
+        if (this.sources == null) {
+            this.sources = new ArrayList<>();
+        }
+    }
+}

common/src/main/java/net/lionarius/skinrestorer/config/provider/collection/CollectionSkinFile.java

@@ -0,0 +1,60 @@
+package net.lionarius.skinrestorer.config.provider.collection;
+
+import net.lionarius.skinrestorer.SkinRestorer;
+import net.lionarius.skinrestorer.skin.SkinVariant;
+import net.lionarius.skinrestorer.util.gson.GsonPostProcessable;
+import org.jetbrains.annotations.Nullable;
+
+import java.net.URI;
+import java.nio.file.Files;
+import java.nio.file.Path;
+
+public final class CollectionSkinFile implements CollectionSkinSource, GsonPostProcessable {
+    private String path = "";
+    private SkinVariant variant = SkinVariant.CLASSIC;
+    
+    @Override
+    public @Nullable URI uri() {
+        if (this.path.isEmpty())
+            return null;
+        
+        try {
+            var filePath = SkinRestorer.getConfigDir().resolve(this.path);
+            
+            if (!Files.exists(filePath)) {
+                SkinRestorer.LOGGER.warn("Skin file does not exist: {}", this.path);
+                return null;
+            }
+            
+            if (!Files.isRegularFile(filePath)) {
+                SkinRestorer.LOGGER.warn("Skin path is not a file: {}", this.path);
+                return null;
+            }
+            
+            if (!this.path.toLowerCase().endsWith(".png")) {
+                SkinRestorer.LOGGER.warn("Skin file is not a PNG file: {}", this.path);
+                return null;
+            }
+            
+            return filePath.toUri();
+        } catch (Exception e) {
+            SkinRestorer.LOGGER.warn("Invalid file path: {}", this.path, e);
+            return null;
+        }
+    }
+    
+    @Override
+    public SkinVariant variant() {
+        return this.variant;
+    }
+    
+    @Override
+    public void gsonPostProcess() {
+        if (this.path == null) {
+            this.path = "";
+        }
+        if (this.variant == null) {
+            this.variant = SkinVariant.CLASSIC;
+        }
+    }
+}

common/src/main/java/net/lionarius/skinrestorer/config/provider/collection/CollectionSkinSource.java

@@ -0,0 +1,12 @@
+package net.lionarius.skinrestorer.config.provider.collection;
+
+import net.lionarius.skinrestorer.skin.SkinVariant;
+import org.jetbrains.annotations.Nullable;
+
+import java.net.URI;
+
+public interface CollectionSkinSource {
+    @Nullable URI uri();
+    
+    SkinVariant variant();
+}

common/src/main/java/net/lionarius/skinrestorer/config/provider/collection/CollectionSkinSourceListDeserializer.java

@@ -0,0 +1,35 @@
+package net.lionarius.skinrestorer.config.provider.collection;
+
+import com.google.gson.*;
+
+import java.lang.reflect.Type;
+import java.util.ArrayList;
+import java.util.List;
+
+public class CollectionSkinSourceListDeserializer implements JsonSerializer<List<CollectionSkinSource>>, JsonDeserializer<List<CollectionSkinSource>> {
+    @Override
+    public JsonElement serialize(List<CollectionSkinSource> src, Type typeOfT, JsonSerializationContext context) {
+        return context.serialize(src, List.class);
+    }
+    
+    @Override
+    public List<CollectionSkinSource> deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context)
+            throws JsonParseException {
+        List<CollectionSkinSource> sources = new ArrayList<>();
+        
+        if (json.isJsonArray()) {
+            for (JsonElement element : json.getAsJsonArray()) {
+                if (element.isJsonObject()) {
+                    JsonObject obj = element.getAsJsonObject();
+                    if (obj.has("url")) {
+                        sources.add(context.deserialize(obj, CollectionSkinUrl.class));
+                    } else if (obj.has("path")) {
+                        sources.add(context.deserialize(obj, CollectionSkinFile.class));
+                    }
+                }
+            }
+        }
+        
+        return sources;
+    }
+}

common/src/main/java/net/lionarius/skinrestorer/config/provider/collection/CollectionSkinUrl.java

@@ -0,0 +1,41 @@
+package net.lionarius.skinrestorer.config.provider.collection;
+
+import net.lionarius.skinrestorer.SkinRestorer;
+import net.lionarius.skinrestorer.skin.SkinVariant;
+import net.lionarius.skinrestorer.util.gson.GsonPostProcessable;
+import org.jetbrains.annotations.Nullable;
+
+import java.net.URI;
+
+public final class CollectionSkinUrl implements CollectionSkinSource, GsonPostProcessable {
+    private String url = "";
+    private SkinVariant variant = SkinVariant.CLASSIC;
+    
+    @Override
+    public @Nullable URI uri() {
+        try {
+            if (this.url.isEmpty())
+                return null;
+            
+            return new URI(this.url);
+        } catch (Exception e) {
+            SkinRestorer.LOGGER.warn("Invalid URI: {}", this.url, e);
+            return null;
+        }
+    }
+    
+    @Override
+    public SkinVariant variant() {
+        return this.variant;
+    }
+    
+    @Override
+    public void gsonPostProcess() {
+        if (this.url == null) {
+            this.url = "";
+        }
+        if (this.variant == null) {
+            this.variant = SkinVariant.CLASSIC;
+        }
+    }
+}

common/src/main/java/net/lionarius/skinrestorer/exception/TransparentException.java

@@ -0,0 +1,19 @@
+package net.lionarius.skinrestorer.exception;
+
+import org.jetbrains.annotations.NotNull;
+
+public class TransparentException extends RuntimeException {
+    public TransparentException(@NotNull Throwable cause) {
+        super(cause);
+    }
+    
+    @Override
+    public String getMessage() {
+        return this.getCause().getMessage();
+    }
+    
+    @Override
+    public String toString() {
+        return this.getLocalizedMessage();
+    }
+}

common/src/main/java/net/lionarius/skinrestorer/mineskin/Java11RequestHandler.java

@@ -0,0 +1,190 @@
+package net.lionarius.skinrestorer.mineskin;
+
+import com.google.gson.Gson;
+import com.google.gson.JsonObject;
+import com.google.gson.JsonParseException;
+import org.mineskin.MineSkinClientImpl;
+import org.mineskin.data.CodeAndMessage;
+import org.mineskin.exception.MineSkinRequestException;
+import org.mineskin.exception.MineskinException;
+import org.mineskin.request.RequestHandler;
+import org.mineskin.response.MineSkinResponse;
+import org.mineskin.response.ResponseConstructor;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.InetSocketAddress;
+import java.net.ProxySelector;
+import java.net.URI;
+import java.net.http.HttpClient;
+import java.net.http.HttpRequest;
+import java.net.http.HttpRequest.BodyPublishers;
+import java.net.http.HttpResponse;
+import java.net.http.HttpResponse.BodyHandlers;
+import java.util.Map;
+import java.util.logging.Level;
+import java.util.stream.Collectors;
+
+// copy-pasted from https://github.com/InventivetalentDev/MineskinClient/blob/master/java11/src/main/java/org/mineskin/Java11RequestHandler.java
+// with some modifications to support proxy
+public class Java11RequestHandler extends RequestHandler {
+    
+    private final Gson gson;
+    private final HttpClient httpClient;
+    
+    public Java11RequestHandler(String baseUrl, String userAgent, String apiKey, int timeout, Gson gson, InetSocketAddress proxy) {
+        super(baseUrl, userAgent, apiKey, timeout, gson);
+        this.gson = gson;
+        
+        HttpClient.Builder clientBuilder = HttpClient.newBuilder()
+                .connectTimeout(java.time.Duration.ofMillis(timeout));
+        
+        if (userAgent != null) {
+            clientBuilder.followRedirects(HttpClient.Redirect.NORMAL);
+        }
+        
+        if (proxy != null) {
+            clientBuilder.proxy(ProxySelector.of(proxy));
+        }
+        
+        this.httpClient = clientBuilder.build();
+    }
+    
+    private <T, R extends MineSkinResponse<T>> R wrapResponse(HttpResponse<String> response, Class<T> clazz, ResponseConstructor<T, R> constructor)
+            throws IOException {
+        String rawBody = response.body();
+        try {
+            JsonObject jsonBody = gson.fromJson(rawBody, JsonObject.class);
+            R wrapped = constructor.construct(
+                    response.statusCode(),
+                    lowercaseHeaders(response.headers().map()),
+                    jsonBody,
+                    gson, clazz
+            );
+            if (!wrapped.isSuccess()) {
+                throw new MineSkinRequestException(
+                        wrapped.getFirstError().map(CodeAndMessage::code).orElse("request_failed"),
+                        wrapped.getFirstError().map(CodeAndMessage::message).orElse("Request Failed"),
+                        wrapped
+                );
+            }
+            return wrapped;
+        } catch (JsonParseException e) {
+            MineSkinClientImpl.LOGGER.log(Level.WARNING, "Failed to parse response body: " + rawBody, e);
+            throw new MineskinException("Failed to parse response", e);
+        }
+    }
+    
+    private Map<String, String> lowercaseHeaders(Map<String, java.util.List<String>> headers) {
+        return headers.entrySet().stream()
+                .collect(Collectors.toMap(
+                        entry -> entry.getKey().toLowerCase(),
+                        entry -> String.join(", ", entry.getValue())
+                ));
+    }
+    
+    public <T, R extends MineSkinResponse<T>> R getJson(String url, Class<T> clazz, ResponseConstructor<T, R> constructor)
+            throws IOException {
+        url = this.baseUrl + url;
+        MineSkinClientImpl.LOGGER.fine("GET " + url);
+        
+        HttpRequest.Builder requestBuilder = HttpRequest.newBuilder()
+                .uri(URI.create(url))
+                .GET()
+                .header("User-Agent", this.userAgent);
+        HttpRequest request;
+        if (apiKey != null) {
+            request = requestBuilder
+                    .header("Authorization", "Bearer " + apiKey)
+                    .header("Accept", "application/json").build();
+        } else {
+            request = requestBuilder.build();
+        }
+        HttpResponse<String> response;
+        try {
+            response = this.httpClient.send(request, BodyHandlers.ofString());
+        } catch (InterruptedException e) {
+            throw new RuntimeException(e);
+        }
+        return wrapResponse(response, clazz, constructor);
+    }
+    
+    public <T, R extends MineSkinResponse<T>> R postJson(String url, JsonObject data, Class<T> clazz, ResponseConstructor<T, R> constructor)
+            throws IOException {
+        url = this.baseUrl + url;
+        MineSkinClientImpl.LOGGER.fine("POST " + url);
+        
+        HttpRequest.Builder requestBuilder = HttpRequest.newBuilder()
+                .uri(URI.create(url))
+                .POST(BodyPublishers.ofString(gson.toJson(data)))
+                .header("Content-Type", "application/json")
+                .header("User-Agent", this.userAgent);
+        HttpRequest request;
+        if (apiKey != null) {
+            request = requestBuilder
+                    .header("Authorization", "Bearer " + apiKey)
+                    .header("Accept", "application/json").build();
+        } else {
+            request = requestBuilder.build();
+        }
+        
+        HttpResponse<String> response;
+        try {
+            response = this.httpClient.send(request, BodyHandlers.ofString());
+        } catch (InterruptedException e) {
+            throw new RuntimeException(e);
+        }
+        return wrapResponse(response, clazz, constructor);
+    }
+    
+    public <T, R extends MineSkinResponse<T>> R postFormDataFile(String url, String key, String filename, InputStream in, Map<String, String> data, Class<T> clazz, ResponseConstructor<T, R> constructor)
+            throws IOException {
+        url = this.baseUrl + url;
+        MineSkinClientImpl.LOGGER.fine("POST " + url);
+        
+        String boundary = "mineskin-" + System.currentTimeMillis();
+        StringBuilder bodyBuilder = new StringBuilder();
+        
+        // add form fields
+        for (Map.Entry<String, String> entry : data.entrySet()) {
+            bodyBuilder.append("--").append(boundary).append("\r\n")
+                    .append("Content-Disposition: form-data; name=\"").append(entry.getKey()).append("\"\r\n\r\n")
+                    .append(entry.getValue()).append("\r\n");
+        }
+        
+        // add file
+        byte[] fileContent = in.readAllBytes();
+        bodyBuilder.append("--").append(boundary).append("\r\n")
+                .append("Content-Disposition: form-data; name=\"").append(key)
+                .append("\"; filename=\"").append(filename).append("\"\r\n")
+                .append("Content-Type: image/png\r\n\r\n");
+        byte[] bodyStart = bodyBuilder.toString().getBytes();
+        byte[] boundaryEnd = ("\r\n--" + boundary + "--\r\n").getBytes();
+        byte[] bodyString = new byte[bodyStart.length + fileContent.length + boundaryEnd.length];
+        System.arraycopy(bodyStart, 0, bodyString, 0, bodyStart.length);
+        System.arraycopy(fileContent, 0, bodyString, bodyStart.length, fileContent.length);
+        System.arraycopy(boundaryEnd, 0, bodyString, bodyStart.length + fileContent.length, boundaryEnd.length);
+        
+        HttpRequest.Builder requestBuilder = HttpRequest.newBuilder()
+                .uri(URI.create(url))
+                .POST(HttpRequest.BodyPublishers.ofByteArray(bodyString))
+                .header("Content-Type", "multipart/form-data; boundary=" + boundary)
+                .header("User-Agent", this.userAgent);
+        HttpRequest request;
+        if (apiKey != null) {
+            request = requestBuilder
+                    .header("Authorization", "Bearer " + apiKey)
+                    .header("Accept", "application/json").build();
+        } else {
+            request = requestBuilder.build();
+        }
+        
+        HttpResponse<String> response;
+        try {
+            response = this.httpClient.send(request, BodyHandlers.ofString());
+        } catch (InterruptedException e) {
+            throw new RuntimeException(e);
+        }
+        return wrapResponse(response, clazz, constructor);
+    }
+}

common/src/main/java/net/lionarius/skinrestorer/mixin/ChunkMapAccessor.java

@@ -9,5 +9,5 @@ import org.spongepowered.asm.mixin.gen.Accessor;
 public interface ChunkMapAccessor {
     
     @Accessor
-    Int2ObjectMap<Object> getEntityMap();
+    Int2ObjectMap<TrackedEntityAccessorInvoker> getEntityMap();
 }

common/src/main/java/net/lionarius/skinrestorer/mixin/GameProfileCacheAccessor.java

@@ -0,0 +1,14 @@
+package net.lionarius.skinrestorer.mixin;
+
+import net.minecraft.server.players.GameProfileCache;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.gen.Accessor;
+
+import java.util.Map;
+
+@Mixin(GameProfileCache.class)
+public interface GameProfileCacheAccessor {
+    
+    @Accessor
+    Map<String, GameProfileCache.GameProfileInfo> getProfilesByName();
+}

common/src/main/java/net/lionarius/skinrestorer/mixin/PlayerListMixin.java

@@ -4,10 +4,12 @@ import net.lionarius.skinrestorer.SkinRestorer;
 import net.minecraft.network.Connection;
 import net.minecraft.server.MinecraftServer;
 import net.minecraft.server.level.ServerPlayer;
+import net.minecraft.server.network.CommonListenerCookie;
 import net.minecraft.server.players.PlayerList;
 import org.spongepowered.asm.mixin.Final;
 import org.spongepowered.asm.mixin.Mixin;
 import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.Unique;
 import org.spongepowered.asm.mixin.injection.At;
 import org.spongepowered.asm.mixin.injection.Inject;
 import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
@@ -26,18 +28,34 @@ public abstract class PlayerListMixin {
     
     @Inject(method = "remove", at = @At("TAIL"))
     private void remove(ServerPlayer player, CallbackInfo ci) {
-        SkinRestorer.getSkinStorage().removeSkin(player.getUUID());
+        SkinRestorer.Events.onPlayerDisconnect(player);
     }
     
     @Inject(method = "removeAll", at = @At("HEAD"))
     private void removeAll(CallbackInfo ci) {
-        for (ServerPlayer player : getPlayers()) {
-            SkinRestorer.getSkinStorage().removeSkin(player.getUUID());
+        for (var player : getPlayers()) {
+            SkinRestorer.Events.onPlayerDisconnect(player);
         }
     }
     
     @Inject(method = "placeNewPlayer", at = @At("HEAD"))
-    private void placeNewPlayer(Connection connection, ServerPlayer player, CallbackInfo ci) {
+    private void placeNewPlayer(Connection connection, ServerPlayer player, CommonListenerCookie cookie, CallbackInfo ci) {
+        var delay = SkinRestorer.getConfig().skinApplyDelayOnJoin();
+        
+        if (delay <= 0) {
+            skinrestorer$tryApplySkin(server, player);
+        } else {
+            var uuid = player.getUUID();
+            SkinRestorer.getTickedScheduler().schedule(() -> {
+                var actualPlayer = server.getPlayerList().getPlayer(uuid);
+                if (actualPlayer != null)
+                    skinrestorer$tryApplySkin(server, actualPlayer);
+            }, delay, uuid);
+        }
+    }
+    
+    @Unique
+    private static void skinrestorer$tryApplySkin(MinecraftServer server, ServerPlayer player) {
         if (SkinRestorer.getSkinStorage().hasSavedSkin(player.getUUID()))
             SkinRestorer.applySkin(server, Collections.singleton(player.getGameProfile()), SkinRestorer.getSkinStorage().getSkin(player.getUUID()));
     }

common/src/main/java/net/lionarius/skinrestorer/mixin/ServerLoginPacketListenerImplMixin.java

@@ -2,6 +2,7 @@ package net.lionarius.skinrestorer.mixin;
 
 import com.mojang.authlib.GameProfile;
 import net.lionarius.skinrestorer.SkinRestorer;
+import net.lionarius.skinrestorer.config.FirstJoinSkinProvider;
 import net.lionarius.skinrestorer.skin.SkinValue;
 import net.lionarius.skinrestorer.skin.provider.SkinProviderContext;
 import net.lionarius.skinrestorer.util.PlayerUtils;
@@ -21,18 +22,18 @@ import java.util.concurrent.CompletableFuture;
 public abstract class ServerLoginPacketListenerImplMixin {
     
     @Shadow @Nullable
-    private GameProfile gameProfile;
+    private GameProfile authenticatedProfile;
     
     @Unique
     private CompletableFuture<Void> skinrestorer$pendingSkin;
     
-    @Inject(method = "handleAcceptedLogin", at = @At(value = "INVOKE",
+    @Inject(method = "verifyLoginAndFinishConnectionSetup", at = @At(value = "INVOKE",
                                                                      target = "Lnet/minecraft/server/players/PlayerList;canPlayerLogin(Ljava/net/SocketAddress;Lcom/mojang/authlib/GameProfile;)Lnet/minecraft/network/chat/Component;"),
             cancellable = true)
     public void waitForSkin(CallbackInfo ci) {
         if (skinrestorer$pendingSkin == null) {
             skinrestorer$pendingSkin = CompletableFuture.supplyAsync(() -> {
-                final var profile = gameProfile;
+                final var profile = authenticatedProfile;
                 
                 assert profile != null;
                 var originalSkin = PlayerUtils.getPlayerSkin(profile);
@@ -53,9 +54,15 @@ public abstract class ServerLoginPacketListenerImplMixin {
                     return null;
                 }
                 
-                if (originalSkin == null && SkinRestorer.getConfig().fetchSkinOnFirstJoin()) {
+                var config = SkinRestorer.getConfig();
+                var provider = config.firstJoinSkinProvider();
+                
+                var shouldFetch = (originalSkin == null && config.fetchSkinOnFirstJoin()) ||
+                                      (originalSkin != null && config.forceFirstJoinSkinFetch() && provider != FirstJoinSkinProvider.MOJANG);
+                
+                if (shouldFetch) {
                     var context = new SkinProviderContext(
-                            SkinRestorer.getConfig().firstJoinSkinProvider().getName(),
+                            provider.getName(),
                             profile.getName(),
                             null
                     );
@@ -72,17 +79,17 @@ public abstract class ServerLoginPacketListenerImplMixin {
     
     @Unique
     private static void skinrestorer$fetchSkin(GameProfile profile, SkinProviderContext context) {
-        SkinRestorer.LOGGER.debug("fetching {}'s skin", profile.getName());
+        SkinRestorer.LOGGER.debug("Fetching {}'s skin", profile.getName());
         
         var result = SkinRestorer.getProvider(context.name()).map(
                 provider -> provider.fetchSkin(context.argument(), context.variant())
-        ).orElseGet(() -> Result.error(new IllegalArgumentException("skin provider is not registered: " + context.name())));
+        ).orElseGet(() -> Result.error(new IllegalArgumentException("Skin provider is not registered: " + context.name())));
         
         if (!result.isError()) {
             var value = SkinValue.fromProviderContextWithValue(context, result.getSuccessValue().orElse(null));
             SkinRestorer.getSkinStorage().setSkin(profile.getId(), value);
         } else {
-            SkinRestorer.LOGGER.warn("failed to fetch skin", result.getErrorValue());
+            SkinRestorer.LOGGER.warn("Failed to fetch skin '{}:{}'", context.name(), context.argument(), result.getErrorValue());
         }
     }
 }

common/src/main/java/net/lionarius/skinrestorer/mixin/SkullBlockEntityMixin.java

@@ -0,0 +1,69 @@
+package net.lionarius.skinrestorer.mixin;
+
+import com.mojang.authlib.GameProfile;
+import net.lionarius.skinrestorer.SkinRestorer;
+import net.lionarius.skinrestorer.util.PlayerUtils;
+import net.minecraft.Util;
+import net.minecraft.server.Services;
+import net.minecraft.world.level.block.entity.SkullBlockEntity;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Unique;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable;
+
+import java.util.Locale;
+import java.util.Optional;
+import java.util.UUID;
+import java.util.concurrent.CompletableFuture;
+import java.util.function.BooleanSupplier;
+
+@Mixin(SkullBlockEntity.class)
+public abstract class SkullBlockEntityMixin {
+    
+    @Inject(method = "fetchProfileByName", at = @At("HEAD"),
+            cancellable = true)
+    private static void fetchProfileByName(String name, Services services, CallbackInfoReturnable<CompletableFuture<Optional<GameProfile>>> cir) {
+        if (name == null)
+            return;
+        
+        var profileOpt = Optional.<GameProfile>empty();
+        var gameProfileInfo = ((GameProfileCacheAccessor) services.profileCache()).getProfilesByName().get(name.toLowerCase(Locale.ROOT));
+        
+        if (gameProfileInfo != null)
+            profileOpt = Optional.of(gameProfileInfo.getProfile());
+        
+        skinrestorer$replaceSkin(profileOpt, cir);
+    }
+    
+    @Inject(method = "fetchProfileById", at = @At("HEAD"),
+            cancellable = true)
+    private static void fetchProfileById(UUID id, Services services, BooleanSupplier cacheUninitialized, CallbackInfoReturnable<CompletableFuture<Optional<GameProfile>>> cir) {
+        if (id == null)
+            return;
+        
+        var profileOpt = services.profileCache().get(id);
+        
+        skinrestorer$replaceSkin(profileOpt, cir);
+    }
+    
+    @Unique
+    private static void skinrestorer$replaceSkin(Optional<GameProfile> profileOpt, CallbackInfoReturnable<CompletableFuture<Optional<GameProfile>>> cir) {
+        if (SkinRestorer.getMinecraftServer() == null)
+            return;
+        
+        if (profileOpt.isEmpty())
+            return;
+        
+        var profile = PlayerUtils.cloneGameProfile(profileOpt.get());
+        
+        if (SkinRestorer.getSkinStorage().hasSavedSkin(profile.getId())) {
+            cir.setReturnValue(CompletableFuture.supplyAsync(() -> {
+                var skin = SkinRestorer.getSkinStorage().getSkin(profile.getId(), false);
+                PlayerUtils.applyRestoredSkin(profile, skin.value());
+                
+                return Optional.of(profile);
+            }, Util.backgroundExecutor()));
+        }
+    }
+}

common/src/main/java/net/lionarius/skinrestorer/platform/Services.java

@@ -1,15 +1,17 @@
 package net.lionarius.skinrestorer.platform;
 
 import net.lionarius.skinrestorer.SkinRestorer;
+import net.lionarius.skinrestorer.platform.services.CompatibilityHelper;
 import net.lionarius.skinrestorer.platform.services.PlatformHelper;
 
 import java.util.ServiceLoader;
 
 public final class Services {
     
-    private Services() {}
-
     public final static PlatformHelper PLATFORM = load(PlatformHelper.class);
+    public final static CompatibilityHelper COMPATIBILITY = load(CompatibilityHelper.class);
+    
+    private Services() {}
     
     private static <T> T load(Class<T> clazz) {
         final T loadedService = ServiceLoader.load(clazz)

common/src/main/java/net/lionarius/skinrestorer/platform/services/CompatibilityHelper.java

@@ -0,0 +1,8 @@
+package net.lionarius.skinrestorer.platform.services;
+
+import net.minecraft.server.level.ServerPlayer;
+
+public interface CompatibilityHelper {
+    
+    void skinShuffle_sendHandshake(ServerPlayer player);
+}

common/src/main/java/net/lionarius/skinrestorer/skin/SkinIO.java

@@ -27,9 +27,7 @@ public class SkinIO {
     
     public SkinValue loadSkin(UUID uuid) {
         try {
-            var value = SkinIO.loadSkin(savePath.resolve(SkinIO.uuidToFilename(uuid)));
-            Objects.requireNonNull(value.provider());
-            return value;
+            return SkinIO.loadSkin(savePath.resolve(SkinIO.uuidToFilename(uuid)));
         } catch (Exception e) {
             return SkinValue.EMPTY;
         }

common/src/main/java/net/lionarius/skinrestorer/skin/SkinStorage.java

@@ -17,15 +17,22 @@ public class SkinStorage {
         return this.skinMap.containsKey(uuid) || this.skinIO.skinExists(uuid);
     }
     
-    public SkinValue getSkin(UUID uuid) {
+    public SkinValue getSkin(UUID uuid, boolean cache) {
         if (!skinMap.containsKey(uuid)) {
             var skin = skinIO.loadSkin(uuid);
+            if (!cache)
+                return skin;
+            
             setSkin(uuid, skin);
         }
         
         return skinMap.get(uuid);
     }
     
+    public SkinValue getSkin(UUID uuid) {
+        return this.getSkin(uuid, true);
+    }
+    
     public void removeSkin(UUID uuid, boolean save) {
         var skin = skinMap.remove(uuid);
         if (skin != null && save)

common/src/main/java/net/lionarius/skinrestorer/skin/SkinValue.java

@@ -3,11 +3,14 @@ package net.lionarius.skinrestorer.skin;
 import com.mojang.authlib.properties.Property;
 import net.lionarius.skinrestorer.skin.provider.EmptySkinProvider;
 import net.lionarius.skinrestorer.skin.provider.SkinProviderContext;
+import net.lionarius.skinrestorer.util.gson.GsonPostProcessable;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
+import java.util.Objects;
+
 public record SkinValue(@NotNull String provider, @Nullable String argument, @Nullable SkinVariant variant,
-                        @Nullable Property value, @Nullable Property originalValue) {
+                        @Nullable Property value, @Nullable Property originalValue) implements GsonPostProcessable {
     
     public static final SkinValue EMPTY = new SkinValue(EmptySkinProvider.PROVIDER_NAME, null, null, null);
     
@@ -30,4 +33,9 @@ public record SkinValue(@NotNull String provider, @Nullable String argument, @Nu
     public SkinValue setOriginalValue(Property originalValue) {
         return new SkinValue(this.provider, this.argument, this.variant, this.value, originalValue);
     }
+    
+    @Override
+    public void gsonPostProcess() {
+        Objects.requireNonNull(this.provider);
+    }
 }

common/src/main/java/net/lionarius/skinrestorer/skin/SkinVariant.java

@@ -1,8 +1,11 @@
 package net.lionarius.skinrestorer.skin;
 
+import com.google.gson.annotations.SerializedName;
+
 public enum SkinVariant {
-    
+    @SerializedName(value = "classic", alternate = {"CLASSIC"})
     CLASSIC("classic"),
+    @SerializedName(value = "slim", alternate = {"SLIM"})
     SLIM("slim");
     
     private final String name;

common/src/main/java/net/lionarius/skinrestorer/skin/provider/CollectionSkinProvider.java

@@ -0,0 +1,91 @@
+package net.lionarius.skinrestorer.skin.provider;
+
+import com.google.common.cache.CacheBuilder;
+import com.google.common.cache.CacheLoader;
+import com.google.common.cache.LoadingCache;
+import com.google.common.util.concurrent.UncheckedExecutionException;
+import com.mojang.authlib.properties.Property;
+import it.unimi.dsi.fastutil.Pair;
+import net.lionarius.skinrestorer.SkinRestorer;
+import net.lionarius.skinrestorer.config.provider.collection.CollectionSkinSource;
+import net.lionarius.skinrestorer.skin.SkinVariant;
+import net.lionarius.skinrestorer.util.Result;
+import org.jetbrains.annotations.NotNull;
+
+import java.net.URI;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Optional;
+import java.util.concurrent.TimeUnit;
+
+public final class CollectionSkinProvider implements SkinProvider {
+    
+    public static final String PROVIDER_NAME = "collection";
+    
+    private static LoadingCache<Integer, Optional<Property>> SKIN_CACHE;
+    
+    private static List<Pair<URI, SkinVariant>> COLLECTION_SKINS;
+    
+    public static void reload() {
+        COLLECTION_SKINS = loadCollectionSkins();
+        
+        createCache();
+    }
+    
+    private static List<Pair<URI, SkinVariant>> loadCollectionSkins() {
+        List<Pair<URI, SkinVariant>> skins = new ArrayList<>();
+        
+        var config = SkinRestorer.getConfig().providersConfig().collection();
+        
+        for (CollectionSkinSource source : config.sources()) {
+            var uri = source.uri();
+            if (uri != null) {
+                skins.add(Pair.of(uri, source.variant()));
+            }
+        }
+        
+        return skins;
+    }
+    
+    private static void createCache() {
+        var config = SkinRestorer.getConfig().providersConfig().collection();
+        var time = config.cache().enabled() ? config.cache().duration() : 0;
+        
+        SKIN_CACHE = CacheBuilder.newBuilder()
+                .expireAfterWrite(time, TimeUnit.SECONDS)
+                .build(new CacheLoader<>() {
+                    @Override
+                    public @NotNull Optional<Property> load(@NotNull Integer key) throws Exception {
+                        var skinEntry = COLLECTION_SKINS.get(key);
+                        return MineskinSkinProvider.loadSkin(skinEntry.first(), skinEntry.second());
+                    }
+                });
+    }
+    
+    @Override
+    public String getArgumentName() {
+        return "seed";
+    }
+    
+    @Override
+    public boolean hasVariantSupport() {
+        return false;
+    }
+    
+    @Override
+    public Result<Optional<Property>, Exception> fetchSkin(String argument, SkinVariant variant) {
+        if (COLLECTION_SKINS.isEmpty()) {
+            return Result.error(new IllegalStateException("No collection skins configured"));
+        }
+        
+        var skinIndex = Math.abs(argument.hashCode()) % COLLECTION_SKINS.size();
+        
+        try {
+            return Result.success(SKIN_CACHE.get(skinIndex));
+        } catch (UncheckedExecutionException e) {
+            return Result.error((Exception) e.getCause());
+        } catch (Exception e) {
+            return Result.error(e);
+        }
+    }
+}

common/src/main/java/net/lionarius/skinrestorer/skin/provider/ElyBySkinProvider.java

@@ -9,7 +9,11 @@ import com.mojang.authlib.properties.Property;
 import com.mojang.authlib.yggdrasil.response.MinecraftProfilePropertiesResponse;
 import net.lionarius.skinrestorer.SkinRestorer;
 import net.lionarius.skinrestorer.skin.SkinVariant;
-import net.lionarius.skinrestorer.util.*;
+import net.lionarius.skinrestorer.util.JsonUtils;
+import net.lionarius.skinrestorer.util.PlayerUtils;
+import net.lionarius.skinrestorer.util.Result;
+import net.lionarius.skinrestorer.util.WebUtils;
+import net.minecraft.util.StringUtil;
 import org.jetbrains.annotations.NotNull;
 
 import java.io.IOException;
@@ -36,7 +40,11 @@ public final class ElyBySkinProvider implements SkinProvider {
         }
     }
     
-    public static void createCache() {
+    public static void reload() {
+        createCache();
+    }
+    
+    private static void createCache() {
         var config = SkinRestorer.getConfig().providersConfig().ely_by();
         var time = config.cache().enabled() ? config.cache().duration() : 0;
         
@@ -63,7 +71,7 @@ public final class ElyBySkinProvider implements SkinProvider {
     @Override
     public Result<Optional<Property>, Exception> fetchSkin(String username, SkinVariant variant) {
         try {
-            if (!StringUtils.isValidPlayerName(username))
+            if (!StringUtil.isValidPlayerName(username))
                 throw new IllegalArgumentException("invalid username");
             
             var usernameLowerCase = username.toLowerCase(Locale.ROOT);
@@ -98,6 +106,6 @@ public final class ElyBySkinProvider implements SkinProvider {
         if (response.statusCode() != 200)
             throw new IllegalArgumentException("no profile with name " + username);
         
-        return PlayerUtils.toProfile(JsonUtils.fromJson(response.body(), MinecraftProfilePropertiesResponse.class));
+        return JsonUtils.fromJson(response.body(), MinecraftProfilePropertiesResponse.class).toProfile();
     }
 }

common/src/main/java/net/lionarius/skinrestorer/skin/provider/MineskinSkinProvider.java

@@ -4,21 +4,27 @@ import com.google.common.cache.CacheBuilder;
 import com.google.common.cache.CacheLoader;
 import com.google.common.cache.LoadingCache;
 import com.google.common.util.concurrent.UncheckedExecutionException;
-import com.google.gson.JsonObject;
 import com.mojang.authlib.properties.Property;
 import it.unimi.dsi.fastutil.Pair;
 import net.lionarius.skinrestorer.SkinRestorer;
+import net.lionarius.skinrestorer.mineskin.Java11RequestHandler;
 import net.lionarius.skinrestorer.skin.SkinVariant;
 import net.lionarius.skinrestorer.util.JsonUtils;
 import net.lionarius.skinrestorer.util.PlayerUtils;
 import net.lionarius.skinrestorer.util.Result;
 import net.lionarius.skinrestorer.util.WebUtils;
 import org.jetbrains.annotations.NotNull;
+import org.mineskin.MineSkinClient;
+import org.mineskin.data.Variant;
+import org.mineskin.data.Visibility;
+import org.mineskin.request.GenerateRequest;
+import org.mineskin.response.QueueResponse;
 
-import java.io.IOException;
+import java.net.InetSocketAddress;
 import java.net.URI;
-import java.net.URISyntaxException;
-import java.net.http.HttpRequest;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.time.Duration;
 import java.util.Optional;
 import java.util.concurrent.TimeUnit;
 
@@ -26,19 +32,34 @@ public final class MineskinSkinProvider implements SkinProvider {
     
     public static final String PROVIDER_NAME = "web";
     
-    private static final URI API_URI;
+    private static MineSkinClient MINESKIN_CLIENT;
     
     private static LoadingCache<Pair<URI, SkinVariant>, Optional<Property>> SKIN_CACHE;
     
-    static {
-        try {
-            API_URI = new URI("https://api.mineskin.org");
-        } catch (URISyntaxException e) {
-            throw new IllegalArgumentException(e);
-        }
+    public static void reload() {
+        var config = SkinRestorer.getConfig();
+        var configApiKey = config.providersConfig().mineskin().apiKey();
+        
+        MINESKIN_CLIENT = MineSkinClient
+                .builder()
+                .userAgent(WebUtils.USER_AGENT)
+                .gson(JsonUtils.GSON)
+                .timeout((int) Duration.ofSeconds(config.requestTimeout()).toMillis())
+                .requestHandler((baseUrl, userAgent, apiKey, timeout, gson) -> new Java11RequestHandler(
+                        baseUrl,
+                        userAgent,
+                        apiKey,
+                        timeout,
+                        gson,
+                        SkinRestorer.getConfig().proxy().map(proxy -> new InetSocketAddress(proxy.host(), proxy.port())).orElse(null)
+                ))
+                .apiKey(configApiKey.isEmpty() ? null : configApiKey)
+                .build();
+        
+        createCache();
     }
     
-    public static void createCache() {
+    private static void createCache() {
         var config = SkinRestorer.getConfig().providersConfig().mineskin();
         var time = config.cache().enabled() ? config.cache().duration() : 0;
         
@@ -75,30 +96,32 @@ public final class MineskinSkinProvider implements SkinProvider {
         }
     }
     
-    private static Optional<Property> loadSkin(URI uri, SkinVariant variant) throws Exception {
-        var result = MineskinSkinProvider.uploadToMineskin(uri, variant);
-        var texture = result.getAsJsonObject("data").getAsJsonObject("texture");
-        var textures = new Property(PlayerUtils.TEXTURES_KEY, texture.get("value").getAsString(), texture.get("signature").getAsString());
+    static Optional<Property> loadSkin(URI uri, SkinVariant variant) throws Exception {
+        var mineskinVariant = switch (variant) {
+            case CLASSIC -> Variant.CLASSIC;
+            case SLIM -> Variant.SLIM;
+        };
         
-        return Optional.of(textures);
-    }
-    
-    private static JsonObject uploadToMineskin(URI url, SkinVariant variant) throws IOException {
-        var body = ("{\"variant\":\"%s\",\"name\":\"%s\",\"visibility\":%d,\"url\":\"%s\"}")
-                .formatted(variant.toString(), "none", 0, url);
+        var request = "file".equals(uri.getScheme())
+                ? GenerateRequest.upload(Files.newInputStream(Path.of(uri)))
+                .variant(mineskinVariant)
+                .name("skinrestorer-skin")
+                .visibility(Visibility.UNLISTED)
+                : GenerateRequest.url(uri)
+                .variant(mineskinVariant)
+                .name("skinrestorer-skin")
+                .visibility(Visibility.UNLISTED);
         
-        var request = HttpRequest.newBuilder()
-                .uri(MineskinSkinProvider.API_URI.resolve("/generate/url"))
-                .POST(HttpRequest.BodyPublishers.ofString(body))
-                .header("Content-Type", "application/json")
-                .build();
+        var skin = MINESKIN_CLIENT.queue().submit(request)
+                .thenApply(QueueResponse::getJob)
+                .thenCompose(jobInfo -> jobInfo.waitForCompletion(MINESKIN_CLIENT))
+                .thenCompose(jobReference -> jobReference.getOrLoadSkin(MINESKIN_CLIENT))
+                .join();
         
-        var response = WebUtils.executeRequest(request);
-        WebUtils.throwOnClientErrors(response);
-        
-        if (response.statusCode() != 200)
-            throw new IllegalArgumentException("could not get mineskin skin");
-        
-        return JsonUtils.parseJson(response.body());
+        return Optional.of(new Property(
+                PlayerUtils.TEXTURES_KEY,
+                skin.texture().data().value(),
+                skin.texture().data().signature()
+        ));
     }
 }

common/src/main/java/net/lionarius/skinrestorer/skin/provider/MojangSkinProvider.java

@@ -4,13 +4,20 @@ import com.google.common.cache.CacheBuilder;
 import com.google.common.cache.CacheLoader;
 import com.google.common.cache.LoadingCache;
 import com.google.common.util.concurrent.UncheckedExecutionException;
-import com.mojang.authlib.GameProfile;
+import com.mojang.authlib.*;
 import com.mojang.authlib.properties.Property;
+import com.mojang.authlib.yggdrasil.YggdrasilEnvironment;
 import com.mojang.authlib.yggdrasil.response.MinecraftProfilePropertiesResponse;
+import com.mojang.util.UndashedUuid;
 import net.lionarius.skinrestorer.SkinRestorer;
+import net.lionarius.skinrestorer.exception.TransparentException;
 import net.lionarius.skinrestorer.skin.SkinVariant;
-import net.lionarius.skinrestorer.util.*;
+import net.lionarius.skinrestorer.util.JsonUtils;
+import net.lionarius.skinrestorer.util.PlayerUtils;
+import net.lionarius.skinrestorer.util.Result;
+import net.lionarius.skinrestorer.util.WebUtils;
 import net.minecraft.server.players.GameProfileCache;
+import net.minecraft.util.StringUtil;
 import org.jetbrains.annotations.NotNull;
 
 import java.io.IOException;
@@ -25,7 +32,8 @@ public final class MojangSkinProvider implements SkinProvider {
     
     public static final String PROVIDER_NAME = "mojang";
     
-    private static final URI API_URI;
+    private static final Environment ENVIRONMENT;
+    private static final URI SERVICES_SERVER_URI;
     private static final URI SESSION_SERVER_URI;
     
     public static final String PROFILE_CACHE_FILENAME = "mojang_profile_cache.json";
@@ -35,27 +43,31 @@ public final class MojangSkinProvider implements SkinProvider {
     
     static {
         try {
-            API_URI = new URI("https://api.mojang.com");
-            SESSION_SERVER_URI = new URI("https://sessionserver.mojang.com");
+            ENVIRONMENT = EnvironmentParser.getEnvironmentFromProperties().orElse(YggdrasilEnvironment.PROD.getEnvironment());
+            
+            SERVICES_SERVER_URI = new URI(ENVIRONMENT.servicesHost());
+            SESSION_SERVER_URI = new URI(ENVIRONMENT.sessionHost());
         } catch (URISyntaxException e) {
             throw new IllegalArgumentException(e);
         }
         
-        PROFILE_CACHE = new GameProfileCache((names, agent, callback) -> {
+        PROFILE_CACHE = new GameProfileCache((names, callback) -> {
             for (var name : names) {
                 try {
                     var profile = MojangSkinProvider.getProfile(name);
                     callback.onProfileLookupSucceeded(profile);
                 } catch (IOException e) {
-                    callback.onProfileLookupFailed(new GameProfile(null, name), e);
+                    throw new TransparentException(e);
                 }
             }
         }, SkinRestorer.getConfigDir().resolve(PROFILE_CACHE_FILENAME).toFile());
-        
-        
     }
     
-    public static void createCache() {
+    public static void reload() {
+        createCache();
+    }
+    
+    private static void createCache() {
         var config = SkinRestorer.getConfig().providersConfig().mojang();
         var time = config.cache().enabled() ? config.cache().duration() : 0;
         
@@ -86,7 +98,7 @@ public final class MojangSkinProvider implements SkinProvider {
     @Override
     public Result<Optional<Property>, Exception> fetchSkin(String username, SkinVariant variant) {
         try {
-            if (!StringUtils.isValidPlayerName(username))
+            if (!StringUtil.isValidPlayerName(username))
                 throw new IllegalArgumentException("invalid username");
             
             var cachedProfile = MojangSkinProvider.PROFILE_CACHE.get(username);
@@ -110,8 +122,8 @@ public final class MojangSkinProvider implements SkinProvider {
     
     private static GameProfile getProfile(final String name) throws IOException {
         var request = HttpRequest.newBuilder()
-                .uri(MojangSkinProvider.API_URI
-                        .resolve("/users/profiles/minecraft/")
+                .uri(MojangSkinProvider.SERVICES_SERVER_URI
+                        .resolve("/minecraft/profile/lookup/name/")
                         .resolve(name)
                 )
                 .GET()
@@ -130,7 +142,7 @@ public final class MojangSkinProvider implements SkinProvider {
         var request = HttpRequest.newBuilder()
                 .uri(MojangSkinProvider.SESSION_SERVER_URI
                         .resolve("/session/minecraft/profile/")
-                        .resolve(uuid.toString() + "?unsigned=false")
+                        .resolve(UndashedUuid.toString(uuid) + "?unsigned=false")
                 )
                 .GET()
                 .build();
@@ -141,6 +153,6 @@ public final class MojangSkinProvider implements SkinProvider {
         if (response.statusCode() != 200)
             throw new IllegalArgumentException("no profile with uuid " + uuid);
         
-        return PlayerUtils.toProfile(JsonUtils.fromJson(response.body(), MinecraftProfilePropertiesResponse.class));
+        return JsonUtils.fromJson(response.body(), MinecraftProfilePropertiesResponse.class).toProfile();
     }
 }

common/src/main/java/net/lionarius/skinrestorer/skin/provider/SkinProvider.java

@@ -1,18 +1,29 @@
 package net.lionarius.skinrestorer.skin.provider;
 
+import com.google.common.collect.ImmutableSet;
 import com.mojang.authlib.properties.Property;
 import net.lionarius.skinrestorer.skin.SkinVariant;
 import net.lionarius.skinrestorer.util.Result;
 
 import java.util.Optional;
+import java.util.Set;
 
 public interface SkinProvider {
     EmptySkinProvider EMPTY = new EmptySkinProvider();
     MojangSkinProvider MOJANG = new MojangSkinProvider();
     ElyBySkinProvider ELY_BY = new ElyBySkinProvider();
     MineskinSkinProvider MINESKIN = new MineskinSkinProvider();
+    CollectionSkinProvider COLLECTION = new CollectionSkinProvider();
+    SkinShuffleSkinProvider SKIN_SHUFFLE = new SkinShuffleSkinProvider();
     
-    String[] BUILTIN_PROVIDER_NAMES = new String[]{EmptySkinProvider.PROVIDER_NAME, MojangSkinProvider.PROVIDER_NAME, ElyBySkinProvider.PROVIDER_NAME, MineskinSkinProvider.PROVIDER_NAME};
+    Set<String> BUILTIN_PROVIDER_NAMES = ImmutableSet.of(
+            EmptySkinProvider.PROVIDER_NAME,
+            MojangSkinProvider.PROVIDER_NAME,
+            ElyBySkinProvider.PROVIDER_NAME,
+            MineskinSkinProvider.PROVIDER_NAME,
+            CollectionSkinProvider.PROVIDER_NAME,
+            SkinShuffleSkinProvider.PROVIDER_NAME
+    );
     
     String getArgumentName();
     

common/src/main/java/net/lionarius/skinrestorer/skin/provider/SkinShuffleSkinProvider.java

@@ -0,0 +1,27 @@
+package net.lionarius.skinrestorer.skin.provider;
+
+import com.mojang.authlib.properties.Property;
+import net.lionarius.skinrestorer.skin.SkinVariant;
+import net.lionarius.skinrestorer.util.Result;
+
+import java.util.Optional;
+
+public final class SkinShuffleSkinProvider implements SkinProvider {
+    
+    public static final String PROVIDER_NAME = "skinshuffle";
+    
+    @Override
+    public String getArgumentName() {
+        return "unsupported";
+    }
+    
+    @Override
+    public boolean hasVariantSupport() {
+        return false;
+    }
+    
+    @Override
+    public Result<Optional<Property>, Exception> fetchSkin(String argument, SkinVariant variant) {
+        return Result.error(new UnsupportedOperationException("SkinShuffle Provider does not support fetching skins"));
+    }
+}

common/src/main/java/net/lionarius/skinrestorer/util/FileUtils.java

@@ -42,7 +42,7 @@ public final class FileUtils {
                 }
             }
         } catch (Exception e) {
-            SkinRestorer.LOGGER.error("could not migrate skin directory", e);
+            SkinRestorer.LOGGER.error("Could not migrate skin directory", e);
         }
     }
     
@@ -55,7 +55,7 @@ public final class FileUtils {
                 return StringUtils.readString(reader);
             }
         } catch (IOException e) {
-            SkinRestorer.LOGGER.error("failed to read resource", e);
+            SkinRestorer.LOGGER.error("Failed to read resource", e);
             return null;
         }
     }
@@ -67,7 +67,7 @@ public final class FileUtils {
             
             return Files.readString(file);
         } catch (Exception e) {
-            SkinRestorer.LOGGER.error("failed to read file", e);
+            SkinRestorer.LOGGER.error("Failed to read file", e);
             return null;
         }
     }
@@ -83,7 +83,7 @@ public final class FileUtils {
             
             Files.writeString(file, content);
         } catch (IOException e) {
-            SkinRestorer.LOGGER.error("failed to write file", e);
+            SkinRestorer.LOGGER.error("Failed to write file", e);
         }
     }
     
@@ -92,7 +92,7 @@ public final class FileUtils {
             if (Files.exists(file))
                 Files.delete(file);
         } catch (IOException e) {
-            SkinRestorer.LOGGER.error("failed to delete file", e);
+            SkinRestorer.LOGGER.error("Failed to delete file", e);
         }
     }
 }

common/src/main/java/net/lionarius/skinrestorer/util/JsonUtils.java

@@ -9,6 +9,7 @@ import com.mojang.authlib.properties.Property;
 import com.mojang.authlib.properties.PropertyMap;
 import com.mojang.util.UUIDTypeAdapter;
 import net.lionarius.skinrestorer.SkinRestorer;
+import net.lionarius.skinrestorer.util.gson.PostProcessingEnabler;
 
 import java.lang.reflect.Type;
 import java.nio.charset.StandardCharsets;
@@ -17,7 +18,8 @@ import java.util.UUID;
 
 public final class JsonUtils {
     
-    private static final Gson GSON = new GsonBuilder()
+    public static final Gson GSON = new GsonBuilder()
+            .registerTypeAdapterFactory(new PostProcessingEnabler())
             .registerTypeAdapter(UUID.class, new UUIDTypeAdapter())
             .registerTypeAdapter(PropertyMap.class, new PropertyMap.Serializer())
             .registerTypeAdapter(GameProfile.class, new GameProfile.Serializer())
@@ -48,13 +50,13 @@ public final class JsonUtils {
     
     public static JsonObject skinPropertyToJson(Property property) {
         try {
-            JsonObject json = GSON.fromJson(new String(Base64.getDecoder().decode(property.getValue()), StandardCharsets.UTF_8), JsonObject.class);
+            JsonObject json = GSON.fromJson(new String(Base64.getDecoder().decode(property.value()), StandardCharsets.UTF_8), JsonObject.class);
             if (json != null)
                 json.remove("timestamp");
             
             return json;
         } catch (Exception e) {
-            SkinRestorer.LOGGER.error(e.toString());
+            SkinRestorer.LOGGER.error("Could not parse skin property", e);
             return null;
         }
     }

common/src/main/java/net/lionarius/skinrestorer/util/PlayerUtils.java

@@ -6,14 +6,12 @@ import com.mojang.authlib.GameProfile;
 import com.mojang.authlib.properties.Property;
 import com.mojang.authlib.yggdrasil.response.MinecraftProfilePropertiesResponse;
 import net.lionarius.skinrestorer.mixin.ChunkMapAccessor;
-import net.lionarius.skinrestorer.mixin.TrackedEntityAccessorInvoker;
 import net.minecraft.network.chat.Component;
 import net.minecraft.network.protocol.game.*;
 import net.minecraft.server.level.ChunkMap;
 import net.minecraft.server.level.ServerLevel;
 import net.minecraft.server.level.ServerPlayer;
 import net.minecraft.server.players.PlayerList;
-import net.minecraft.world.level.biome.BiomeManager;
 
 import java.util.*;
 
@@ -51,14 +49,14 @@ public final class PlayerUtils {
                 )
         ));
         
-        var trackedEntity = (TrackedEntityAccessorInvoker) ((ChunkMapAccessor) chunkMap).getEntityMap().get(player.getId());
+        var trackedEntity = ((ChunkMapAccessor) chunkMap).getEntityMap().get(player.getId());
         if (trackedEntity != null) {
             var seenBy = Set.copyOf(trackedEntity.getSeenBy());
             for (var observerConnection : seenBy) {
                 var observer = observerConnection.getPlayer();
                 trackedEntity.invokeRemovePlayer(observer);
                 
-                var trackedObserverEntity = (TrackedEntityAccessorInvoker) ((ChunkMapAccessor) chunkMap).getEntityMap().get(observer.getId());
+                var trackedObserverEntity = ((ChunkMapAccessor) chunkMap).getEntityMap().get(observer.getId());
                 if (trackedObserverEntity != null) {
                     trackedObserverEntity.invokeRemovePlayer(player);
                     trackedObserverEntity.invokeUpdatePlayer(player);
@@ -68,20 +66,12 @@ public final class PlayerUtils {
         }
         
         if (!player.isDeadOrDying()) {
-            player.connection.send(
-                    new ClientboundRespawnPacket(
-                            player.level().dimensionTypeId(),
-                            player.level().dimension(),
-                            BiomeManager.obfuscateSeed(player.serverLevel().getSeed()),
-                            player.gameMode.getGameModeForPlayer(),
-                            player.gameMode.getPreviousGameModeForPlayer(),
-                            player.level().isDebug(),
-                            player.serverLevel().isFlat(),
-                            (byte) 3,
-                            player.getLastDeathLocation(),
-                            player.getPortalCooldown()
+            player.connection.send(new ClientboundBundlePacket(
+                    List.of(
+                            new ClientboundRespawnPacket(player.createCommonSpawnInfo(serverLevel), ClientboundRespawnPacket.KEEP_ALL_DATA),
+                            new ClientboundGameEventPacket(ClientboundGameEventPacket.LEVEL_CHUNKS_LOAD_START, 0)
                     )
-            );
+            ));
             player.connection.teleport(player.getX(), player.getY(), player.getZ(), player.getYRot(), player.getXRot());
             player.connection.send(new ClientboundSetEntityMotionPacket(player));
             var vehicle = player.getVehicle();
@@ -95,16 +85,23 @@ public final class PlayerUtils {
             playerList.sendPlayerPermissionLevel(player);
             playerList.sendLevelInfo(player, serverLevel);
             playerList.sendAllPlayerInfo(player);
-            PlayerUtils.sendActivePlayerEffects(player);
+            playerList.sendActivePlayerEffects(player);
         }
     }
     
     private static void sendActivePlayerEffects(ServerPlayer player) {
         for (var effect : player.getActiveEffects()) {
-            player.connection.send(new ClientboundUpdateMobEffectPacket(player.getId(), effect));
+            player.connection.send(new ClientboundUpdateMobEffectPacket(player.getId(), effect, false));
         }
     }
     
+    public static GameProfile cloneGameProfile(GameProfile profile) {
+        var newProfile = new GameProfile(profile.getId(), profile.getName());
+        newProfile.getProperties().putAll(profile.getProperties());
+        
+        return newProfile;
+    }
+    
     public static Property getPlayerSkin(GameProfile profile) {
         return Iterables.getFirst(profile.getProperties().get(TEXTURES_KEY), null);
     }
@@ -136,8 +133,8 @@ public final class PlayerUtils {
     }
     
     public static GameProfile toProfile(MinecraftProfilePropertiesResponse response) {
-        final GameProfile profile = new GameProfile(response.getId(), response.getName());
-        profile.getProperties().putAll(response.getProperties());
+        final GameProfile profile = new GameProfile(response.id(), response.name());
+        profile.getProperties().putAll(response.properties());
         return profile;
     }
 }

common/src/main/java/net/lionarius/skinrestorer/util/Result.java

@@ -19,6 +19,18 @@ public class Result<S, E> {
         this.errorValue = errorValue;
     }
     
+    public static <S, E> Result<S, E> success(@NotNull S successValue) {
+        return new Result<>(successValue, null);
+    }
+    
+    public static <S, E> Result<S, E> error(@NotNull E errorValue) {
+        return new Result<>(null, errorValue);
+    }
+    
+    public static <S, E> Result<Optional<S>, E> ofNullable(S successValue) {
+        return Result.success(Optional.ofNullable(successValue));
+    }
+    
     public S getSuccessValue() {
         return successValue;
     }
@@ -69,16 +81,4 @@ public class Result<S, E> {
     public int hashCode() {
         return Objects.hash(successValue, errorValue);
     }
-    
-    public static <S, E> Result<S, E> success(@NotNull S successValue) {
-        return new Result<>(successValue, null);
-    }
-    
-    public static <S, E> Result<S, E> error(@NotNull E errorValue) {
-        return new Result<>(null, errorValue);
-    }
-    
-    public static <S, E> Result<Optional<S>, E> ofNullable(S successValue) {
-        return Result.success(Optional.ofNullable(successValue));
-    }
 }

common/src/main/java/net/lionarius/skinrestorer/util/TickedScheduler.java

@@ -0,0 +1,60 @@
+package net.lionarius.skinrestorer.util;
+
+import net.minecraft.server.MinecraftServer;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.Map;
+import java.util.Queue;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.PriorityBlockingQueue;
+
+public class TickedScheduler implements Runnable {
+    private final MinecraftServer server;
+    private final Queue<TickTask> queue = new PriorityBlockingQueue<>();
+    private final Map<Integer, Integer> idMap = new ConcurrentHashMap<>();
+    
+    public TickedScheduler(MinecraftServer server) {
+        this.server = server;
+    }
+    
+    public void schedule(Runnable task, int delay) {
+        this.schedule(task, delay, task);
+    }
+    
+    public void schedule(Runnable task, int delay, Object id) {
+        var taskId = id.hashCode();
+        var serverTick = this.server.getTickCount();
+        this.idMap.merge(taskId, serverTick, Integer::max);
+        this.queue.add(new TickTask(serverTick, serverTick + delay, taskId, task));
+    }
+    
+    public void cancel(Object id) {
+        var taskId = id.hashCode();
+        this.idMap.remove(taskId);
+    }
+    
+    @Override
+    public void run() {
+        TickTask nextTask;
+        while ((nextTask = this.queue.peek()) != null) {
+            if (nextTask.runOnTick() > this.server.getTickCount())
+                break;
+            
+            var tickTask = this.queue.remove();
+            var lastTaskScheduledOnTick = this.idMap.get(tickTask.id());
+            
+            if (lastTaskScheduledOnTick != null && lastTaskScheduledOnTick <= tickTask.scheduledOnTick()) {
+                this.idMap.remove(tickTask.id());
+                if (tickTask.task() != null)
+                    tickTask.task().run();
+            }
+        }
+    }
+    
+    private record TickTask(int scheduledOnTick, int runOnTick, int id, Runnable task) implements Comparable<TickTask> {
+        @Override
+        public int compareTo(@NotNull TickedScheduler.TickTask other) {
+            return Integer.compare(this.runOnTick, other.runOnTick);
+        }
+    }
+}

common/src/main/java/net/lionarius/skinrestorer/util/WebUtils.java

@@ -13,8 +13,6 @@ import java.time.temporal.ChronoUnit;
 
 public final class WebUtils {
     
-    private WebUtils() {}
-    
     public static final String USER_AGENT;
     
     private static HttpClient HTTP_CLIENT = null;
@@ -23,6 +21,8 @@ public final class WebUtils {
         USER_AGENT = String.format("SkinRestorer/%d", System.currentTimeMillis() % 65535);
     }
     
+    private WebUtils() {}
+    
     public static void recreateHttpClient() {
         HTTP_CLIENT = WebUtils.buildClient();
     }
@@ -36,7 +36,7 @@ public final class WebUtils {
         try {
             builder.connectTimeout(Duration.of(SkinRestorer.getConfig().requestTimeout(), ChronoUnit.SECONDS));
         } catch (IllegalArgumentException e) {
-            SkinRestorer.LOGGER.error("failed to set request timeout", e);
+            SkinRestorer.LOGGER.error("Failed to set request timeout", e);
             builder.connectTimeout(Duration.of(10, ChronoUnit.SECONDS));
         }
         

common/src/main/java/net/lionarius/skinrestorer/util/gson/GsonPostProcessable.java

@@ -0,0 +1,5 @@
+package net.lionarius.skinrestorer.util.gson;
+
+public interface GsonPostProcessable {
+    void gsonPostProcess();
+}

common/src/main/java/net/lionarius/skinrestorer/util/gson/PostProcessingEnabler.java

@@ -0,0 +1,34 @@
+package net.lionarius.skinrestorer.util.gson;
+
+import com.google.gson.Gson;
+import com.google.gson.TypeAdapter;
+import com.google.gson.TypeAdapterFactory;
+import com.google.gson.reflect.TypeToken;
+import com.google.gson.stream.JsonReader;
+import com.google.gson.stream.JsonWriter;
+
+import java.io.IOException;
+
+public class PostProcessingEnabler implements TypeAdapterFactory {
+    @Override
+    public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> type) {
+        var adapter = gson.getDelegateAdapter(this, type);
+        
+        return new TypeAdapter<>() {
+            @Override
+            public void write(JsonWriter out, T value) throws IOException {
+                adapter.write(out, value);
+            }
+            
+            @Override
+            public T read(JsonReader in) throws IOException {
+                var value = adapter.read(in);
+                
+                if (value instanceof GsonPostProcessable postProcessable)
+                    postProcessable.gsonPostProcess();
+                
+                return value;
+            }
+        };
+    }
+}

common/src/main/resources/META-INF/accesstransformer.cfg

@@ -0,0 +1 @@
+public net.minecraft.server.players.GameProfileCache$GameProfileInfo

common/src/main/resources/skinrestorer.accesswidener

@@ -0,0 +1,3 @@
+accessWidener v2 named
+
+accessible class net/minecraft/server/players/GameProfileCache$GameProfileInfo

common/src/main/resources/skinrestorer.mixins.json

@@ -2,13 +2,16 @@
     "required": true,
     "minVersion": "0.8",
     "package": "net.lionarius.skinrestorer.mixin",
-    "compatibilityLevel": "JAVA_8",
+    "compatibilityLevel": "JAVA_17",
+    "priority": 1100,
     "refmap": "${mod_id}.refmap.json",
     "mixins": [
+        "ChunkMapAccessor",
         "PlayerListMixin",
         "ServerLoginPacketListenerImplMixin",
-        "ChunkMapAccessor",
-        "TrackedEntityAccessorInvoker"
+        "TrackedEntityAccessorInvoker",
+        "SkullBlockEntityMixin",
+        "GameProfileCacheAccessor"
     ],
     "injectors": {
         "defaultRequire": 1

fabric/build.gradle

@@ -1,10 +1,11 @@
 plugins {
     id 'multiloader-loader'
-    
+
     id 'fabric-loom'
 
     id 'multiloader-publish'
 }
+
 dependencies {
     minecraft "com.mojang:minecraft:${minecraft_version}"
     mappings loom.layered {
@@ -12,6 +13,10 @@ dependencies {
         parchment("org.parchmentmc.data:parchment-${parchment_minecraft}:${parchment_version}@zip")
     }
     modImplementation "net.fabricmc:fabric-loader:${fabric_loader_version}"
+
+    modCompileOnly "net.fabricmc.fabric-api:fabric-api:${fabric_api_version}"
+
+    include implementation("org.mineskin:java-client:${mineskin_client_version}")
 }
 
 loom {
@@ -19,11 +24,11 @@ loom {
     if (aw.exists()) {
         accessWidenerPath.set(aw)
     }
-    
+
     mixin {
         defaultRefmapName.set("${mod_id}.refmap.json")
     }
-    
+
     runs {
         client {
             client()

fabric/gradle.properties

@@ -0,0 +1,6 @@
+# Fabric, see https://fabricmc.net/develop/ for new versions
+fabric_loader_version=0.15.0
+fabric_api_version=0.100.1+1.21
+
+optional_dependencies=fabric-api
+additional_modloaders=quilt

fabric/src/main/java/net/lionarius/skinrestorer/fabric/SkinRestorerFabric.java

@@ -2,10 +2,18 @@ package net.lionarius.skinrestorer.fabric;
 
 import net.fabricmc.api.ModInitializer;
 import net.lionarius.skinrestorer.SkinRestorer;
+import net.lionarius.skinrestorer.compat.skinshuffle.SkinShuffleCompatibility;
+import net.lionarius.skinrestorer.platform.Services;
 
 public final class SkinRestorerFabric implements ModInitializer {
+    
+    public static final boolean FABRIC_API_LOADED = Services.PLATFORM.isModLoaded("fabric-api");
+    
     @Override
     public void onInitialize() {
         SkinRestorer.onInitialize();
+        
+        if (SkinShuffleCompatibility.shouldApply())
+            net.lionarius.skinrestorer.fabric.compat.skinshuffle.SkinShuffleCompatibility.initialize();
     }
 }

fabric/src/main/java/net/lionarius/skinrestorer/fabric/compat/skinshuffle/SkinShuffleCompatibility.java

@@ -0,0 +1,37 @@
+package net.lionarius.skinrestorer.fabric.compat.skinshuffle;
+
+import net.fabricmc.fabric.api.networking.v1.PayloadTypeRegistry;
+import net.fabricmc.fabric.api.networking.v1.ServerPlayConnectionEvents;
+import net.fabricmc.fabric.api.networking.v1.ServerPlayNetworking;
+import net.lionarius.skinrestorer.SkinRestorer;
+import net.lionarius.skinrestorer.compat.skinshuffle.SkinShuffleHandshakePayload;
+import net.lionarius.skinrestorer.compat.skinshuffle.SkinShuffleSkinRefreshPayload;
+import net.lionarius.skinrestorer.compat.skinshuffle.SkinShuffleSkinRefreshV1Payload;
+import net.lionarius.skinrestorer.compat.skinshuffle.SkinShuffleSkinRefreshV2Payload;
+import net.lionarius.skinrestorer.fabric.SkinRestorerFabric;
+
+public final class SkinShuffleCompatibility {
+    
+    private SkinShuffleCompatibility() {}
+    
+    public static void initialize() {
+        if (!SkinRestorerFabric.FABRIC_API_LOADED) {
+            SkinRestorer.LOGGER.warn("fabric-api is not loaded, SkinShuffle compatibility will not be available");
+            return;
+        }
+        
+        PayloadTypeRegistry.playS2C().register(SkinShuffleHandshakePayload.PACKET_ID, SkinShuffleHandshakePayload.PACKET_CODEC);
+        PayloadTypeRegistry.playC2S().register(SkinShuffleSkinRefreshV1Payload.PACKET_ID, SkinShuffleSkinRefreshV1Payload.PACKET_CODEC);
+        PayloadTypeRegistry.playC2S().register(SkinShuffleSkinRefreshV2Payload.PACKET_ID, SkinShuffleSkinRefreshV2Payload.PACKET_CODEC);
+        
+        ServerPlayConnectionEvents.JOIN.register((handler, sender, server) -> net.lionarius.skinrestorer.compat.skinshuffle.SkinShuffleCompatibility.onPlayerJoin(handler.getPlayer()));
+        
+        ServerPlayNetworking.registerGlobalReceiver(SkinShuffleSkinRefreshV1Payload.PACKET_ID, SkinShuffleCompatibility::handleSkinRefreshPacket);
+        
+        ServerPlayNetworking.registerGlobalReceiver(SkinShuffleSkinRefreshV2Payload.PACKET_ID, SkinShuffleCompatibility::handleSkinRefreshPacket);
+    }
+    
+    private static void handleSkinRefreshPacket(SkinShuffleSkinRefreshPayload payload, ServerPlayNetworking.Context context) {
+        net.lionarius.skinrestorer.compat.skinshuffle.SkinShuffleCompatibility.handleSkinRefresh(context.player().getServer(), context.player(), payload);
+    }
+}

fabric/src/main/java/net/lionarius/skinrestorer/fabric/mixin/CommandsMixin.java

@@ -1,7 +1,7 @@
 package net.lionarius.skinrestorer.fabric.mixin;
 
 import com.mojang.brigadier.CommandDispatcher;
-import net.lionarius.skinrestorer.command.SkinCommand;
+import net.lionarius.skinrestorer.SkinRestorer;
 import net.minecraft.commands.CommandBuildContext;
 import net.minecraft.commands.CommandSourceStack;
 import net.minecraft.commands.Commands;
@@ -21,6 +21,6 @@ public abstract class CommandsMixin {
     @Inject(method = "<init>", at = @At(value = "INVOKE",
                                         target = "Lnet/minecraft/server/commands/AdvancementCommands;register(Lcom/mojang/brigadier/CommandDispatcher;)V"))
     private void init(Commands.CommandSelection environment, CommandBuildContext commandRegistryAccess, CallbackInfo ci) {
-        SkinCommand.register(dispatcher);
+        SkinRestorer.Events.onCommandRegister(dispatcher);
     }
 }

fabric/src/main/java/net/lionarius/skinrestorer/fabric/mixin/MinecraftServerMixin.java

@@ -11,8 +11,14 @@ import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
 public abstract class MinecraftServerMixin {
     
     @Inject(method = "runServer",
-            at = @At(value = "INVOKE", target = "Lnet/minecraft/Util;getMillis()J", ordinal = 0))
+            at = @At(value = "INVOKE", target = "Lnet/minecraft/Util;getNanos()J", ordinal = 0))
     private void onServerStarted(CallbackInfo ci) {
-        SkinRestorer.onServerStarted((MinecraftServer) (Object) this);
+        SkinRestorer.Events.onServerStarted((MinecraftServer) (Object) this);
+    }
+    
+    @Inject(method = "runServer",
+            at = @At(value = "INVOKE", target = "Lnet/minecraft/server/MinecraftServer;onServerExit()V"))
+    private void onServerStopped(CallbackInfo ci) {
+        SkinRestorer.Events.onServerStopped((MinecraftServer) (Object) this);
     }
 }

fabric/src/main/java/net/lionarius/skinrestorer/fabric/platform/FabricCompatibilityHelper.java

@@ -0,0 +1,13 @@
+package net.lionarius.skinrestorer.fabric.platform;
+
+import net.fabricmc.fabric.api.networking.v1.ServerPlayNetworking;
+import net.lionarius.skinrestorer.compat.skinshuffle.SkinShuffleHandshakePayload;
+import net.lionarius.skinrestorer.platform.services.CompatibilityHelper;
+import net.minecraft.server.level.ServerPlayer;
+
+public final class FabricCompatibilityHelper implements CompatibilityHelper {
+    @Override
+    public void skinShuffle_sendHandshake(ServerPlayer player) {
+        ServerPlayNetworking.send(player, SkinShuffleHandshakePayload.INSTANCE);
+    }
+}

fabric/src/main/resources/META-INF/services/net.lionarius.skinrestorer.platform.services.CompatibilityHelper

@@ -0,0 +1 @@
+net.lionarius.skinrestorer.fabric.platform.FabricCompatibilityHelper

fabric/src/main/resources/fabric.mod.json

@@ -24,9 +24,13 @@
         "${mod_id}.mixins.json",
         "${mod_id}.fabric.mixins.json"
     ],
+    "accessWidener": "${mod_id}.accesswidener",
     "depends": {
         "fabricloader": ">=${fabric_loader_version}",
         "minecraft": ">=${minecraft_version}",
         "java": ">=${java_version}"
+    },
+    "suggests": {
+        "fabric-api": "*"
     }
 }

fabric/src/main/resources/skinrestorer.fabric.mixins.json

@@ -2,7 +2,7 @@
     "required": true,
     "minVersion": "0.8",
     "package": "net.lionarius.skinrestorer.fabric.mixin",
-    "compatibilityLevel": "JAVA_8",
+    "compatibilityLevel": "JAVA_17",
     "refmap": "${mod_id}.refmap.json",
     "mixins": [
         "CommandsMixin",

forge/build.gradle

@@ -2,7 +2,7 @@ plugins {
     id 'multiloader-loader'
     id 'idea'
     id 'eclipse'
-    
+
     id 'net.minecraftforge.gradle'
     id 'org.parchmentmc.librarian.forgegradle'
     id 'org.spongepowered.mixin'
@@ -15,22 +15,32 @@ mixin {
     config "${mod_id}.mixins.json"
 }
 
+jarJar.enable()
+
+tasks.named('jarJar') {
+    archiveClassifier = ''
+}
+
+jar.finalizedBy('jarJar')
+
 minecraft {
-    mappings channel: 'parchment', version: "${parchment_version}-${parchment_minecraft}"
+    mappings channel: 'parchment', version: "${parchment_minecraft}-${parchment_version}-${minecraft_version}"
 
     copyIdeResources = true //Calls processResources when in dev
 
+    reobf = false // Forge 1.20.6+ uses official mappings at runtime, so we shouldn't reobf from official to SRG
+
     // Automatically enable forge AccessTransformers if the file exists
     // This location is hardcoded in Forge and can not be changed.
     // https://github.com/MinecraftForge/MinecraftForge/blob/be1698bb1554f9c8fa2f58e32b9ab70bc4385e60/fmlloader/src/main/java/net/minecraftforge/fml/loading/moddiscovery/ModFile.java#L123
-    def at = project(':common').file('src/main/resources/META-INF/accesstransformer.cfg')
+    def at = project(":common").file('src/main/resources/META-INF/accesstransformer.cfg')
     if (at.exists()) {
         accessTransformer = at
     }
 
     runs {
         client {
-            workingDirectory file('../run/client')
+            workingDirectory rootProject.file('run/client')
             ideaModule "${rootProject.name}.${project.name}.main"
             taskName 'Client'
             mods {
@@ -41,7 +51,7 @@ minecraft {
         }
 
         server {
-            workingDirectory file('../run/server')
+            workingDirectory rootProject.file('run/server')
             ideaModule "${rootProject.name}.${project.name}.main"
             taskName 'Server'
             mods {
@@ -58,6 +68,10 @@ dependencies {
 
     annotationProcessor('org.spongepowered:mixin:0.8.5-SNAPSHOT:processor')
     implementation('net.sf.jopt-simple:jopt-simple:5.0.4') { version { strictly '5.0.4' } }
+
+    minecraftLibrary(jarJar(group: 'org.mineskin', name: 'java-client', version: mineskin_client_version)) {
+        jarJar.ranged(it, "[${mineskin_client_version},)")
+    }
 }
 
 // for some reason mixin plugin does not add 'MixinConfigs' to MANIFEST.MF so we do it manually
@@ -74,3 +88,7 @@ sourceSets.each {
     it.output.resourcesDir = dir
     it.java.destinationDirectory = dir
 }
+
+tasks.named('processResources') {
+    duplicatesStrategy = DuplicatesStrategy.INCLUDE
+}

forge/gradle.properties

@@ -0,0 +1,5 @@
+# Forge, see https://files.minecraftforge.net/net/minecraftforge/forge/ for new versions
+forge_version=51.0.0
+forge_loader_version_range=[51,)
+# Forge sometimes skips minor minecraft versions (like 1.20.5)
+forge_minecraft_version=1.21

forge/src/main/java/net/lionarius/skinrestorer/forge/SkinRestorerForge.java

@@ -1,10 +1,10 @@
 package net.lionarius.skinrestorer.forge;
 
 import net.lionarius.skinrestorer.SkinRestorer;
-import net.lionarius.skinrestorer.command.SkinCommand;
-import net.minecraftforge.common.MinecraftForge;
+import net.lionarius.skinrestorer.compat.skinshuffle.SkinShuffleCompatibility;
 import net.minecraftforge.event.RegisterCommandsEvent;
 import net.minecraftforge.event.server.ServerStartedEvent;
+import net.minecraftforge.event.server.ServerStoppedEvent;
 import net.minecraftforge.eventbus.api.SubscribeEvent;
 import net.minecraftforge.fml.common.Mod;
 
@@ -13,18 +13,24 @@ import net.minecraftforge.fml.common.Mod;
 public final class SkinRestorerForge {
     
     public SkinRestorerForge() {
-        MinecraftForge.EVENT_BUS.register(SkinRestorerForge.class);
-        
         SkinRestorer.onInitialize();
+        
+        if (SkinShuffleCompatibility.shouldApply())
+            net.lionarius.skinrestorer.forge.compat.skinshuffle.SkinShuffleCompatibility.initialize();
     }
     
     @SubscribeEvent
     public static void onCommandRegister(RegisterCommandsEvent event) {
-        SkinCommand.register(event.getDispatcher());
+        SkinRestorer.Events.onCommandRegister(event.getDispatcher());
     }
     
     @SubscribeEvent
     public static void onServerStarted(ServerStartedEvent event) {
-        SkinRestorer.onServerStarted(event.getServer());
+        SkinRestorer.Events.onServerStarted(event.getServer());
+    }
+    
+    @SubscribeEvent
+    public static void onServerStopped(ServerStoppedEvent event) {
+        SkinRestorer.Events.onServerStopped(event.getServer());
     }
 }

forge/src/main/java/net/lionarius/skinrestorer/forge/compat/skinshuffle/SkinShuffleCompatibility.java

@@ -0,0 +1,14 @@
+package net.lionarius.skinrestorer.forge.compat.skinshuffle;
+
+import net.minecraftforge.common.MinecraftForge;
+
+public final class SkinShuffleCompatibility {
+    
+    private SkinShuffleCompatibility() {}
+    
+    public static void initialize() {
+        MinecraftForge.EVENT_BUS.register(SkinShuffleGameEventHandler.class);
+        
+        SkinShufflePacketHandler.initialize();
+    }
+}

forge/src/main/java/net/lionarius/skinrestorer/forge/compat/skinshuffle/SkinShuffleGameEventHandler.java

@@ -0,0 +1,16 @@
+package net.lionarius.skinrestorer.forge.compat.skinshuffle;
+
+import net.lionarius.skinrestorer.compat.skinshuffle.SkinShuffleCompatibility;
+import net.minecraft.server.level.ServerPlayer;
+import net.minecraftforge.event.entity.player.PlayerEvent;
+import net.minecraftforge.eventbus.api.SubscribeEvent;
+
+public final class SkinShuffleGameEventHandler {
+    
+    private SkinShuffleGameEventHandler() {}
+    
+    @SubscribeEvent
+    public static void onPlayerLoggedIn(PlayerEvent.PlayerLoggedInEvent event) {
+        SkinShuffleCompatibility.onPlayerJoin((ServerPlayer) event.getEntity());
+    }
+}

forge/src/main/java/net/lionarius/skinrestorer/forge/compat/skinshuffle/SkinShufflePacketHandler.java

@@ -0,0 +1,45 @@
+package net.lionarius.skinrestorer.forge.compat.skinshuffle;
+
+import net.lionarius.skinrestorer.SkinRestorer;
+import net.lionarius.skinrestorer.compat.skinshuffle.*;
+import net.lionarius.skinrestorer.compat.skinshuffle.SkinShuffleCompatibility;
+import net.minecraft.network.Connection;
+import net.minecraft.network.protocol.common.custom.CustomPacketPayload;
+import net.minecraftforge.event.network.CustomPayloadEvent;
+import net.minecraftforge.network.Channel;
+import net.minecraftforge.network.ChannelBuilder;
+
+public class SkinShufflePacketHandler {
+    private static final Channel<CustomPacketPayload> INSTANCE = ChannelBuilder
+            .named(SkinRestorer.resourceLocation("skin_shuffle_compat"))
+            .optional()
+            .payloadChannel()
+            .any()
+            .clientbound()
+            .add(SkinShuffleHandshakePayload.PACKET_ID, SkinShuffleHandshakePayload.PACKET_CODEC, (payload, context) -> {
+            })
+            .serverbound()
+            .add(SkinShuffleSkinRefreshV1Payload.PACKET_ID, SkinShuffleSkinRefreshV1Payload.PACKET_CODEC, SkinShufflePacketHandler::handleSkinRefreshPacket)
+            .add(SkinShuffleSkinRefreshV2Payload.PACKET_ID, SkinShuffleSkinRefreshV2Payload.PACKET_CODEC, SkinShufflePacketHandler::handleSkinRefreshPacket)
+            .build();
+    
+    private SkinShufflePacketHandler() {
+    }
+    
+    protected static void initialize() {
+        // NO-OP
+    }
+    
+    public static void sendHandshake(Connection connection) {
+        INSTANCE.send(SkinShuffleHandshakePayload.INSTANCE, connection);
+    }
+    
+    private static void handleSkinRefreshPacket(SkinShuffleSkinRefreshPayload payload, CustomPayloadEvent.Context context) {
+        var sender = context.getSender();
+        
+        if (!context.isServerSide() || sender == null)
+            return;
+        
+        SkinShuffleCompatibility.handleSkinRefresh(sender.getServer(), sender, payload);
+    }
+}

forge/src/main/java/net/lionarius/skinrestorer/forge/platform/ForgeCompatibilityHelper.java

@@ -0,0 +1,13 @@
+package net.lionarius.skinrestorer.forge.platform;
+
+import net.lionarius.skinrestorer.forge.compat.skinshuffle.SkinShufflePacketHandler;
+import net.lionarius.skinrestorer.platform.services.CompatibilityHelper;
+import net.minecraft.server.level.ServerPlayer;
+
+public final class ForgeCompatibilityHelper implements CompatibilityHelper {
+    
+    @Override
+    public void skinShuffle_sendHandshake(ServerPlayer player) {
+        SkinShufflePacketHandler.sendHandshake(player.connection.getConnection());
+    }
+}

forge/src/main/resources/META-INF/services/net.lionarius.skinrestorer.platform.services.CompatibilityHelper

@@ -0,0 +1 @@
+net.lionarius.skinrestorer.forge.platform.ForgeCompatibilityHelper

gradle.properties

@@ -1,14 +1,14 @@
 # Project
-group=net.lionarius.skinrestorer
-java_version=17
+group=net.lionarius
+java_version=21
 
 # Common
-minecraft_version=1.20
-minecraft_version_list=1.20,1.20.1
-minecraft_version_range=[1.20, 1.20.1]
+minecraft_version=1.21
+minecraft_version_list=1.21,1.21.1,1.21.2,1.21.3,1.21.4
+minecraft_version_range=[1.21, 1.21.4]
 mod_id=skinrestorer
 mod_name=SkinRestorer
-mod_version=2.1.0
+mod_version=2.5.0
 mod_author=Lionarius
 mod_homepage=https://modrinth.com/mod/skinrestorer
 mod_sources=https://github.com/Suiranoil/SkinRestorer
@@ -17,22 +17,12 @@ license=MIT
 credits=
 description=A server-side mod for managing skins.
 
+# Dependencies
+mineskin_client_version=3.2.1-SNAPSHOT
+
 # ParchmentMC mappings, see https://parchmentmc.org/docs/getting-started#choose-a-version for new versions
-parchment_minecraft=1.20.1
-parchment_version=2023.09.03
-
-# Fabric, see https://fabricmc.net/develop/ for new versions
-fabric_loader_version=0.15.0
-
-# Forge, see https://files.minecraftforge.net/net/minecraftforge/forge/ for new versions
-forge_version=46.0.1
-forge_loader_version_range=[46,)
-# Forge sometimes skips minor minecraft versions (like 1.20.5)
-forge_minecraft_version=1.20
-
-# NeoForge, see https://projects.neoforged.net/neoforged/neoforge for new versions
-neoforge_version=20.2.3-beta
-neoforge_loader_version_range=[1,)
+parchment_minecraft=1.21.1
+parchment_version=2024.11.17
 
 # Publishing
 curseforge_id=443823
@@ -41,3 +31,5 @@ modrinth_id=ghrZDhGW
 # Gradle
 org.gradle.jvmargs=-Xmx3G
 org.gradle.daemon=false
+org.gradle.parallel=true
+org.gradle.caching=true

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.8-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.14-bin.zip
 networkTimeout=10000
 validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME

gradlew

@@ -15,6 +15,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
+# SPDX-License-Identifier: Apache-2.0
+#
 
 ##############################################################################
 #
@@ -84,7 +86,7 @@ done
 # shellcheck disable=SC2034
 APP_BASE_NAME=${0##*/}
 # Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
-APP_HOME=$( cd "${APP_HOME:-./}" > /dev/null && pwd -P ) || exit
+APP_HOME=$( cd -P "${APP_HOME:-./}" > /dev/null && printf '%s\n' "$PWD" ) || exit
 
 # Use the maximum available, or set MAX_FD != -1 to use that value.
 MAX_FD=maximum
@@ -112,7 +114,7 @@ case "$( uname )" in                #(
   NONSTOP* )        nonstop=true ;;
 esac
 
-CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+CLASSPATH="\\\"\\\""
 
 
 # Determine the Java command to use to start the JVM.
@@ -203,7 +205,7 @@ fi
 DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
 
 # Collect all arguments for the java command:
-#   * DEFAULT_JVM_OPTS, JAVA_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
 #     and any embedded shellness will be escaped.
 #   * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
 #     treated as '${Hostname}' itself on the command line.
@@ -211,7 +213,7 @@ DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
 set -- \
         "-Dorg.gradle.appname=$APP_BASE_NAME" \
         -classpath "$CLASSPATH" \
-        org.gradle.wrapper.GradleWrapperMain \
+        -jar "$APP_HOME/gradle/wrapper/gradle-wrapper.jar" \
         "$@"
 
 # Stop when "xargs" is not available.

gradlew.bat

@@ -13,6 +13,8 @@
 @rem See the License for the specific language governing permissions and
 @rem limitations under the License.
 @rem
+@rem SPDX-License-Identifier: Apache-2.0
+@rem
 
 @if "%DEBUG%"=="" @echo off
 @rem ##########################################################################
@@ -68,11 +70,11 @@ goto fail
 :execute
 @rem Setup the command line
 
-set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+set CLASSPATH=
 
 
 @rem Execute Gradle
-"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" -jar "%APP_HOME%\gradle\wrapper\gradle-wrapper.jar" %*
 
 :end
 @rem End local scope for the variables with windows NT shell

neoforge/build.gradle

@@ -3,40 +3,58 @@ plugins {
     id 'idea'
     id 'eclipse'
 
-    id 'net.neoforged.gradle.userdev'
+    id 'net.neoforged.moddev'
 
     id 'multiloader-publish'
 }
 
-// Automatically enable neoforge AccessTransformers if the file exists
-def at = project(':common').file('src/main/resources/META-INF/accesstransformer.cfg')
-if (at.exists()) {
-    minecraft.accessTransformers.file(at)
-}
+neoForge {
+    version = neoforge_version
+    
+    // Automatically enable neoforge AccessTransformers if the file exists
+    def at = project(":common").file('src/main/resources/META-INF/accesstransformer.cfg')
+    if (at.exists()) {
+        accessTransformers.from(at.absolutePath)
+    }
 
-subsystems {
     parchment {
         minecraftVersion = parchment_minecraft
         mappingsVersion = parchment_version
     }
-}
 
-runs {
-    configureEach {
-        modSource project.sourceSets.main
-        systemProperty 'neoforge.enabledGameTestNamespaces', project.mod_id
+    runs {
+        configureEach {
+            ideName = "NeoForge ${it.name.capitalize()} (${project.path})" // Unify the run config names with fabric
+        }
+
+        client {
+            client()
+            gameDirectory = rootProject.file('run/client')
+        }
+
+        server {
+            server()
+            programArgument '--nogui'
+            gameDirectory = rootProject.file('run/server')
+        }
     }
 
-    client {
-        workingDirectory = file('../run/client')
-    }
-
-    server {
-        programArgument '--nogui'
-        workingDirectory = file('../run/server')
+    mods {
+        "${mod_id}" {
+            sourceSet sourceSets.main
+        }
     }
 }
 
 dependencies {
     implementation "net.neoforged:neoforge:${neoforge_version}"
+
+    jarJar(implementation('org.mineskin:java-client')) {
+        version {
+            strictly "[${mineskin_client_version},)"
+            prefer mineskin_client_version
+        }
+    }
+
+    additionalRuntimeClasspath "org.mineskin:java-client:${mineskin_client_version}"
 }

neoforge/gradle.properties

@@ -0,0 +1,3 @@
+# NeoForge, see https://projects.neoforged.net/neoforged/neoforge for new versions
+neoforge_version=21.0.0-beta
+neoforge_loader_version_range=[4,)

neoforge/src/main/java/net/lionarius/skinrestorer/neoforge/SkinRestorerNeoForge.java

@@ -1,30 +1,37 @@
 package net.lionarius.skinrestorer.neoforge;
 
 import net.lionarius.skinrestorer.SkinRestorer;
-import net.lionarius.skinrestorer.command.SkinCommand;
+import net.lionarius.skinrestorer.compat.skinshuffle.SkinShuffleCompatibility;
 import net.neoforged.bus.api.SubscribeEvent;
+import net.neoforged.fml.common.EventBusSubscriber;
 import net.neoforged.fml.common.Mod;
-import net.neoforged.neoforge.common.NeoForge;
 import net.neoforged.neoforge.event.RegisterCommandsEvent;
 import net.neoforged.neoforge.event.server.ServerStartedEvent;
+import net.neoforged.neoforge.event.server.ServerStoppedEvent;
 
 @Mod(SkinRestorer.MOD_ID)
-@Mod.EventBusSubscriber(modid = SkinRestorer.MOD_ID)
+@EventBusSubscriber(modid = SkinRestorer.MOD_ID)
 public final class SkinRestorerNeoForge {
     
     public SkinRestorerNeoForge() {
-        NeoForge.EVENT_BUS.register(SkinRestorerNeoForge.class);
-        
         SkinRestorer.onInitialize();
+        
+        if (SkinShuffleCompatibility.shouldApply())
+            net.lionarius.skinrestorer.neoforge.compat.skinshuffle.SkinShuffleCompatibility.initialize();
     }
     
     @SubscribeEvent
     public static void onCommandRegister(RegisterCommandsEvent event) {
-        SkinCommand.register(event.getDispatcher());
+        SkinRestorer.Events.onCommandRegister(event.getDispatcher());
     }
     
     @SubscribeEvent
     public static void onServerStarted(ServerStartedEvent event) {
-        SkinRestorer.onServerStarted(event.getServer());
+        SkinRestorer.Events.onServerStarted(event.getServer());
+    }
+    
+    @SubscribeEvent
+    public static void onServerStopped(ServerStoppedEvent event) {
+        SkinRestorer.Events.onServerStopped(event.getServer());
     }
 }

neoforge/src/main/java/net/lionarius/skinrestorer/neoforge/compat/skinshuffle/SkinShuffleCompatibility.java

@@ -0,0 +1,17 @@
+package net.lionarius.skinrestorer.neoforge.compat.skinshuffle;
+
+import net.lionarius.skinrestorer.SkinRestorer;
+import net.neoforged.fml.ModList;
+import net.neoforged.neoforge.common.NeoForge;
+
+public final class SkinShuffleCompatibility {
+    
+    private SkinShuffleCompatibility() {}
+    
+    public static void initialize() {
+        NeoForge.EVENT_BUS.register(SkinShuffleGameEventHandler.class);
+        
+        final var mod = ModList.get().getModContainerById(SkinRestorer.MOD_ID).get();
+        mod.getEventBus().register(SkinShuffleModEventHandler.class);
+    }
+}

neoforge/src/main/java/net/lionarius/skinrestorer/neoforge/compat/skinshuffle/SkinShuffleGameEventHandler.java

@@ -0,0 +1,16 @@
+package net.lionarius.skinrestorer.neoforge.compat.skinshuffle;
+
+import net.lionarius.skinrestorer.compat.skinshuffle.SkinShuffleCompatibility;
+import net.minecraft.server.level.ServerPlayer;
+import net.neoforged.bus.api.SubscribeEvent;
+import net.neoforged.neoforge.event.entity.player.PlayerEvent;
+
+public final class SkinShuffleGameEventHandler {
+    
+    private SkinShuffleGameEventHandler() {}
+    
+    @SubscribeEvent
+    public static void onPlayerLoggedIn(PlayerEvent.PlayerLoggedInEvent event) {
+        SkinShuffleCompatibility.onPlayerJoin((ServerPlayer) event.getEntity());
+    }
+}

neoforge/src/main/java/net/lionarius/skinrestorer/neoforge/compat/skinshuffle/SkinShuffleModEventHandler.java

@@ -0,0 +1,31 @@
+package net.lionarius.skinrestorer.neoforge.compat.skinshuffle;
+
+import net.lionarius.skinrestorer.compat.skinshuffle.*;
+import net.lionarius.skinrestorer.compat.skinshuffle.SkinShuffleCompatibility;
+import net.minecraft.server.level.ServerPlayer;
+import net.neoforged.bus.api.SubscribeEvent;
+import net.neoforged.neoforge.network.event.RegisterPayloadHandlersEvent;
+import net.neoforged.neoforge.network.handling.IPayloadContext;
+import net.neoforged.neoforge.network.registration.HandlerThread;
+
+public final class SkinShuffleModEventHandler {
+    private SkinShuffleModEventHandler() {}
+    
+    @SubscribeEvent
+    public static void onRegisterPayloadHandlers(RegisterPayloadHandlersEvent event) {
+        final var registrar = event.registrar("1").optional().executesOn(HandlerThread.NETWORK);
+        
+        registrar
+                .playToClient(SkinShuffleHandshakePayload.PACKET_ID, SkinShuffleHandshakePayload.PACKET_CODEC,
+                        (payload, context) -> {})
+                .playToServer(SkinShuffleSkinRefreshV1Payload.PACKET_ID, SkinShuffleSkinRefreshV1Payload.PACKET_CODEC,
+                        SkinShuffleModEventHandler::handleSkinRefreshPacket)
+                .playToServer(SkinShuffleSkinRefreshV2Payload.PACKET_ID, SkinShuffleSkinRefreshV2Payload.PACKET_CODEC,
+                        SkinShuffleModEventHandler::handleSkinRefreshPacket);
+    }
+    
+    private static void handleSkinRefreshPacket(SkinShuffleSkinRefreshPayload payload, IPayloadContext context) {
+        var player = (ServerPlayer) context.player();
+        SkinShuffleCompatibility.handleSkinRefresh(player.getServer(), player, payload);
+    }
+}

neoforge/src/main/java/net/lionarius/skinrestorer/neoforge/platform/NeoForgeCompatibilityHelper.java

@@ -0,0 +1,15 @@
+package net.lionarius.skinrestorer.neoforge.platform;
+
+import net.lionarius.skinrestorer.compat.skinshuffle.SkinShuffleHandshakePayload;
+import net.lionarius.skinrestorer.platform.services.CompatibilityHelper;
+import net.minecraft.network.protocol.common.ClientboundCustomPayloadPacket;
+import net.minecraft.server.level.ServerPlayer;
+
+public final class NeoForgeCompatibilityHelper implements CompatibilityHelper {
+    
+    @Override
+    public void skinShuffle_sendHandshake(ServerPlayer player) {
+        // we can't use the packet distributor here because neoforge doesn't support sending packets to non-neoforge players
+        player.connection.getConnection().send(new ClientboundCustomPayloadPacket(SkinShuffleHandshakePayload.INSTANCE));
+    }
+}

neoforge/src/main/resources/META-INF/neoforge.mods.toml

@@ -17,14 +17,14 @@ config = "${mod_id}.mixins.json"
 
 [[dependencies.${mod_id}]]
 modId = "neoforge"
-mandatory = true
+type = "required"
 versionRange = "[${neoforge_version},)"
 ordering = "NONE"
 side = "BOTH"
 
 [[dependencies.${mod_id}]]
 modId = "minecraft"
-mandatory = true
+type = "required"
 versionRange = "${minecraft_version_range}"
 ordering = "NONE"
 side = "BOTH"

neoforge/src/main/resources/META-INF/services/net.lionarius.skinrestorer.platform.services.CompatibilityHelper

@@ -0,0 +1 @@
+net.lionarius.skinrestorer.neoforge.platform.NeoForgeCompatibilityHelper

settings.gradle

@@ -71,5 +71,4 @@ rootProject.name = 'skin-restorer'
 include('common')
 include('fabric')
 include('forge')
-// There is no NeoForge for versions <1.20.2
-// include('neoforge')
+include('neoforge')