EZCheat-Fabric/src/main/java/com/cimeyclust/ezcheat/client/EzcheatClient.java

package com.cimeyclust.ezcheat.client;

import com.cimeyclust.ezcheat.Ezcheat;
import com.cimeyclust.ezcheat.EzcheatPayload;
import net.fabricmc.api.ClientModInitializer;
import net.fabricmc.fabric.api.client.networking.v1.ClientPlayConnectionEvents;
import net.fabricmc.fabric.api.client.networking.v1.ClientPlayNetworking;
import net.fabricmc.fabric.api.networking.v1.PayloadTypeRegistry;
import net.fabricmc.loader.api.FabricLoader;
import net.fabricmc.loader.api.metadata.ModOrigin;
import org.apache.commons.codec.digest.DigestUtils;

import java.io.IOException;
import java.io.InputStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.HashMap;
import java.util.Map;

public class EzcheatClient implements ClientModInitializer {

    @Override
    public void onInitializeClient() {
        ClientPlayConnectionEvents.JOIN.register((handler, sender, client) -> {
            Ezcheat.LOGGER.info("Joined server: {}", handler.getConnection().getAddress());
            Ezcheat.LOGGER.info("Is Singleplayer: {}", client.isInSingleplayer());
            if (!client.isInSingleplayer()) {

                Ezcheat.LOGGER.info("Sending mod hashes to server");
                this.sendHashes();
            }
        });
    }

    /** Called client‑side to compute & send hashes */
    private void sendHashes() {
        // gather mod files
        Path modsDir = FabricLoader.getInstance()
                .getGameDir()
                .resolve("mods")
                .toAbsolutePath();

        Map<String, String> hashes = new HashMap<>();
        for (var mod : FabricLoader.getInstance().getAllMods()) {
            try {
                var origin = mod.getOrigin();
                // Skip nested origins
                if (origin.getKind() == ModOrigin.Kind.NESTED) {
                    Ezcheat.LOGGER.debug("Skipping nested mod {}", mod.getMetadata().getId());
                    continue;
                }

                Path modFile = null;
                for (Path p : origin.getPaths()) {
                    if (Files.isRegularFile(p)) {
                        modFile = p;
                        break;
                    }
                }

                if (modFile == null) {
                    Ezcheat.LOGGER.debug("Skipping mod {}: No valid path", mod.getMetadata().getId());
                    continue;
                }

                if (modFile.startsWith(modsDir)) {
                    try (InputStream in = Files.newInputStream(modFile)) {
                        hashes.put(mod.getMetadata().getId(), DigestUtils.sha256Hex(in));
                    }
                }
            } catch (IOException e) {
                Ezcheat.LOGGER.warn("Could not hash {}: {}", mod.getMetadata().getId(), e.getMessage());
            }
        }

        EzcheatPayload payload = new EzcheatPayload(hashes);
        ClientPlayNetworking.send(payload);
    }
}