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Fabric/src/main/java/com/aizistral/nochatrestrictions/NoChatRestrictions.java

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+package com.aizistral.nochatrestrictions;
+
+import net.fabricmc.api.ModInitializer;
+
+public class NoChatRestrictions implements ModInitializer {
+
+    @Override
+    public void onInitialize() {
+	// NO-OP
+    }
+
+}

Fabric/src/main/java/com/aizistral/nochatrestrictions/core/NCRCore.java

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+package com.aizistral.nochatrestrictions.core;
+
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+
+public class NCRCore {
+    public static final Logger LOGGER = LogManager.getLogger("NoChatRestrictions");
+}

Fabric/src/main/java/com/aizistral/nochatrestrictions/core/WrappedSocialInteractionsService.java

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+package com.aizistral.nochatrestrictions.core;
+
+import java.util.UUID;
+import com.mojang.authlib.minecraft.SocialInteractionsService;
+
+public class WrappedSocialInteractionsService implements SocialInteractionsService {
+    private final SocialInteractionsService service;
+
+    public WrappedSocialInteractionsService(SocialInteractionsService service) {
+	if (service == null)
+	    throw new NullPointerException("'service' argument cannot be null!");
+
+	this.service = service;
+    }
+
+    @Override
+    public boolean serversAllowed() {
+	return true;
+    }
+
+    @Override
+    public boolean realmsAllowed() {
+	return true;
+    }
+
+    @Override
+    public boolean chatAllowed() {
+	return true;
+    }
+
+    @Override
+    public boolean isBlockedPlayer(UUID playerID) {
+	return this.service.isBlockedPlayer(playerID);
+    }
+
+}

Fabric/src/main/java/com/aizistral/nochatrestrictions/mixins/MixinMinecraft.java

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+package com.aizistral.nochatrestrictions.mixins;
+
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable;
+
+import com.aizistral.nochatrestrictions.core.NCRCore;
+import com.aizistral.nochatrestrictions.core.WrappedSocialInteractionsService;
+import com.mojang.authlib.minecraft.SocialInteractionsService;
+import com.mojang.authlib.yggdrasil.YggdrasilAuthenticationService;
+
+import net.minecraft.client.Minecraft;
+import net.minecraft.client.main.GameConfig;
+
+@Mixin(Minecraft.class)
+public class MixinMinecraft {
+
+    @Inject(method = { "func_244735_a", "createSocialInteractions" }, at = @At("RETURN"), cancellable = true)
+    public void onCreateSocialInteractions(YggdrasilAuthenticationService authService, GameConfig gameConfig,
+	    CallbackInfoReturnable<SocialInteractionsService> info) {
+	SocialInteractionsService returnedService = info.getReturnValue();
+	assert returnedService != null;
+	info.setReturnValue(new WrappedSocialInteractionsService(returnedService));
+
+	NCRCore.LOGGER.info("Successfully supplanted SocialInteractionsService with a wrapped version.");
+    }
+
+}

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

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+{
+	"schemaVersion": 1,
+	"id": "nochatrestrictions",
+	"version": "${version}",
+	"name": "No Chat Restrictions",
+	"description": "A mod dedicated to removing restrictions around the use of multiplayer features, including in-game chat.",
+	"authors": [
+		"Aizistral"
+	],
+	"contact": {
+		"homepage": "https://modrinth.com/project/no-chat-restrictions",
+		"sources": "https://github.com/Aizistral-Studios/No-Chat-Restrictions",
+		"issues": "https://github.com/Aizistral-Studios/No-Chat-Restrictions/issues"
+	},
+	"license": "WTFPL",
+	"environment": "*",
+	"entrypoints": {
+		"main": [
+			"com.aizistral.nochatrestrictions.NoChatRestrictions"
+		]
+	},
+	"mixins": [
+		"nochatrestrictions.mixins.json"
+	],
+	"depends": {
+		"fabricloader": ">=0.18.4",
+		"minecraft": "~1.16.4",
+		"java": ">=8",
+		"fabric": "*"
+	}
+}

Fabric/src/main/resources/nochatrestrictions.mixins.json

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+{
+	"required": true,
+	"package": "com.aizistral.nochatrestrictions.mixins",
+	"compatibilityLevel": "JAVA_8",
+    "minVersion": "0.8",
+    "mixins": [],
+    "client": [
+	  "MixinMinecraft"
+    ],
+	"injectors": {
+		"defaultRequire": 1
+	},
+	"overwrites": {
+		"requireAnnotations": true
+	}
+}