Forge works!

common/src/main/java/org/samo_lego/simpleauth/mixin/MixinServerPlayerEntity.java

@@ -11,16 +11,17 @@ import net.minecraft.util.registry.Registry;
 import net.minecraft.util.registry.RegistryKey;
 import net.minecraft.world.World;
 import org.samo_lego.simpleauth.storage.PlayerCache;
+import org.samo_lego.simpleauth.utils.PlatformSpecific;
 import org.samo_lego.simpleauth.utils.PlayerAuth;
 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;
 
 import static org.samo_lego.simpleauth.SimpleAuth.*;
-import static org.samo_lego.simpleauth.utils.CarpetHelper.isPlayerCarpetFake;
 import static org.samo_lego.simpleauth.utils.SimpleLogger.logInfo;
 
 @Mixin(ServerPlayerEntity.class)
@@ -29,10 +30,9 @@ public class MixinServerPlayerEntity implements PlayerAuth {
     private final ServerPlayerEntity player = (ServerPlayerEntity) (Object) this;
 
     // * 20 for 20 ticks in second
+    @Unique
     private int kickTimer = config.main.kickTime * 20;
 
-    private final boolean isRunningCarpet = false;//FabricLoader.getInstance().isModLoaded("carpet"); //todo
-
     @Final
     @Shadow
     public MinecraftServer server;
@@ -158,8 +158,7 @@ public class MixinServerPlayerEntity implements PlayerAuth {
      */
     @Override
     public boolean canSkipAuth() {
-        // We ask CarpetHelper class since it has the imports needed
-        return (this.isRunningCarpet && isPlayerCarpetFake(this.player)) || (isUsingMojangAccount() && config.main.premiumAutologin);
+        return PlatformSpecific.isPlayerFake(this.player) || (isUsingMojangAccount() && config.main.premiumAutologin);
     }
 
     /**

common/src/main/java/org/samo_lego/simpleauth/utils/PlatformSpecific.java

@@ -0,0 +1,12 @@
+package org.samo_lego.simpleauth.utils;
+
+import me.shedaniel.architectury.annotations.ExpectPlatform;
+import net.minecraft.entity.player.PlayerEntity;
+
+public class PlatformSpecific {
+    @ExpectPlatform
+    public static boolean isPlayerFake(PlayerEntity player) {
+        // Replaced by Architectury
+        throw new AssertionError();
+    }
+}

fabric/src/main/java/org/samo_lego/simpleauth/utils/CarpetHelper.java

@@ -1,17 +1,16 @@
 package org.samo_lego.simpleauth.utils;
 
-//import carpet.patches.EntityPlayerMPFake;
+import carpet.patches.EntityPlayerMPFake;
 import net.minecraft.entity.player.PlayerEntity;
 
 public class CarpetHelper {
     /**
      * Checks if player is actually a fake one.
-     * Fake players are counted as ones, summoned with Carpet mod.
      *
      * @param player player to check
      * @return true if it's fake, otherwise false
      */
-    public static boolean isPlayerCarpetFake(PlayerEntity player) {
-        return false;//player instanceof EntityPlayerMPFake;
+    public static boolean isPlayerFake(PlayerEntity player) {
+        return player instanceof EntityPlayerMPFake;
     }
 }

fabric/src/main/java/org/samo_lego/simpleauth/utils/fabric/PlatformSpecificImpl.java

@@ -0,0 +1,17 @@
+package org.samo_lego.simpleauth.utils.fabric;
+
+import net.fabricmc.loader.api.FabricLoader;
+import net.minecraft.entity.player.PlayerEntity;
+import org.samo_lego.simpleauth.utils.CarpetHelper;
+
+public class PlatformSpecificImpl {
+    /**
+     * Checks if player is actually a fake one.
+     *
+     * @param player player to check
+     * @return true if it's fake, otherwise false
+     */
+    public static boolean isPlayerFake(PlayerEntity player) {
+        return FabricLoader.getInstance().isModLoaded("carpet") && CarpetHelper.isPlayerFake(player);
+    }
+}

forge/src/main/java/org/samo_lego/simpleauth/SimpleAuthForge.java

@@ -3,6 +3,7 @@ package org.samo_lego.simpleauth;
 import com.mojang.brigadier.CommandDispatcher;
 import me.shedaniel.architectury.platform.forge.EventBuses;
 import net.minecraft.server.command.ServerCommandSource;
+import net.minecraftforge.common.MinecraftForge;
 import net.minecraftforge.event.RegisterCommandsEvent;
 import net.minecraftforge.eventbus.api.SubscribeEvent;
 import net.minecraftforge.fml.common.Mod;
@@ -15,8 +16,9 @@ import org.samo_lego.simpleauth.commands.*;
 public class SimpleAuthForge {
     public SimpleAuthForge() {
         // Submit our event bus to let architectury register our content on the right time
-        EventBuses.registerModEventBus(SimpleAuth.MOD_ID, FMLJavaModLoadingContext.get().getModEventBus());
+        //EventBuses.registerModEventBus(SimpleAuth.MOD_ID, FMLJavaModLoadingContext.get().getModEventBus());
         SimpleAuth.init(FMLPaths.GAMEDIR.get());
+        MinecraftForge.EVENT_BUS.register(this);
     }
 
     @SubscribeEvent

forge/src/main/java/org/samo_lego/simpleauth/utils/forge/PlatformSpecificImpl.java

@@ -0,0 +1,11 @@
+package org.samo_lego.simpleauth.utils.forge;
+
+import net.minecraft.entity.player.PlayerEntity;
+
+public class PlatformSpecificImpl {
+    public static boolean isPlayerFake(PlayerEntity player) {
+        // Are there any forge mods with NPCs that don't work with SimpleAuth?
+        // Let me know!
+        return false;
+    }
+}

gradle.properties

@@ -14,7 +14,7 @@ forge_version=36.0.4
 
 
 # Mod Properties
-mod_version = 1.7.4
+mod_version = 1.7.5
 maven_group = org.samo_lego
 archives_base_name = simpleauth