Make explosion spawn radius configurable separately

build.gradle

@@ -7,11 +7,10 @@ version = project.mod_version
 group = project.maven_group
 
 repositories {
-    // Add repositories to retrieve artifacts from in here.
-    // You should only use this when depending on other mods because
-    // Loom adds the essential maven repositories to download Minecraft and libraries from automatically.
-    // See https://docs.gradle.org/current/userguide/declaring_repositories.html
-    // for more information about repositories.
+    maven {
+        name = "Quilt Maven"
+        url = "https://maven.quiltmc.org/repository/release"
+    }
 }
 
 dependencies {
@@ -22,6 +21,8 @@ dependencies {
 
     // Fabric API. This is technically optional, but you probably want it anyway.
     modImplementation "net.fabricmc.fabric-api:fabric-api:${project.fabric_version}"
+
+    implementation "org.quiltmc:quilt-json5:1.0.2"
 }
 
 processResources {

src/main/java/io/github/modrinthsmp/modrinthsmp/ModrinthServerConfig.java

@@ -0,0 +1,34 @@
+package io.github.modrinthsmp.modrinthsmp;
+
+import org.quiltmc.json5.JsonReader;
+import org.quiltmc.json5.JsonWriter;
+
+import java.io.IOException;
+
+public final class ModrinthServerConfig {
+    private int explosionSpawnRadius = 512;
+
+    public int getExplosionSpawnRadius() {
+        return explosionSpawnRadius;
+    }
+
+    public void writeConfig(JsonWriter writer) throws IOException {
+        writer.beginObject(); {
+            writer.comment("Spawn radius to disable explosions within. Same value as server.properties");
+            writer.name("explosionSpawnRadius").value(explosionSpawnRadius);
+        } writer.endObject();
+    }
+
+    public void readConfig(JsonReader reader) throws IOException {
+        reader.beginObject();
+        while (reader.hasNext()) {
+            final String key;
+            //noinspection SwitchStatementWithTooFewBranches
+            switch (key = reader.nextName()) {
+                case "explosionSpawnRadius" -> explosionSpawnRadius = reader.nextInt();
+                default -> ModrinthSmp.LOGGER.warn("Unknown config key: {}", key);
+            }
+        }
+        reader.endObject();
+    }
+}

src/main/java/io/github/modrinthsmp/modrinthsmp/ModrinthSmp.java

@@ -1,9 +1,46 @@
 package io.github.modrinthsmp.modrinthsmp;
 
+import com.mojang.logging.LogUtils;
 import net.fabricmc.api.ModInitializer;
+import net.fabricmc.loader.api.FabricLoader;
+import org.quiltmc.json5.JsonReader;
+import org.quiltmc.json5.JsonWriter;
+import org.slf4j.Logger;
+
+import java.io.IOException;
+import java.nio.file.Path;
 
 public class ModrinthSmp implements ModInitializer {
+    public static final Logger LOGGER = LogUtils.getLogger();
+    private static final ModrinthServerConfig CONFIG = new ModrinthServerConfig();
+
     @Override
     public void onInitialize() {
+        readConfig();
+    }
+
+    public static void readConfig() {
+        try (final JsonReader reader = JsonReader.json5(getConfigPath())) {
+            CONFIG.readConfig(reader);
+        } catch (IOException e) {
+            LOGGER.error("Failed to load config", e);
+        }
+        writeConfig();
+    }
+
+    public static void writeConfig() {
+        try (final JsonWriter writer = JsonWriter.json5(getConfigPath())) {
+            CONFIG.writeConfig(writer);
+        } catch (IOException e) {
+            LOGGER.error("Failed to save config", e);
+        }
+    }
+
+    public static Path getConfigPath() {
+        return FabricLoader.getInstance().getConfigDir().resolve("modrinth-smp.json5");
+    }
+
+    public static ModrinthServerConfig getConfig() {
+        return CONFIG;
     }
 }

src/main/java/io/github/modrinthsmp/modrinthsmp/mixin/MixinServerWorld.java

@@ -1,5 +1,6 @@
 package io.github.modrinthsmp.modrinthsmp.mixin;
 
+import io.github.modrinthsmp.modrinthsmp.ModrinthSmp;
 import net.minecraft.entity.Entity;
 import net.minecraft.entity.damage.DamageSource;
 import net.minecraft.server.world.ServerWorld;
@@ -54,6 +55,6 @@ private boolean spawnProtected() {
         final double distanceX = Math.abs(msu$msw$explosionX - spawnPos.getX());
         final double distanceZ = Math.abs(msu$msw$explosionZ - spawnPos.getZ());
         final double distance = Math.max(distanceX, distanceZ);
-        return distance <= ((ServerWorld)(Object)this).getServer().getSpawnProtectionRadius();
+        return distance <= ModrinthSmp.getConfig().getExplosionSpawnRadius();
     }
 }