add: broadcasting location by sending .xyz (#2)

src/main/java/io/ib67/sfcraft/Helper.java

@@ -28,4 +28,8 @@ public class Helper {
         }
         return null;
     }
+
+    public static int fromRgb(int r, int g, int b) {
+        return ((r & 0x0ff) << 16) | ((g & 0x0ff) << 8) | (b & 0x0ff);
+    }
 }

src/main/java/io/ib67/sfcraft/SFCraft.java

@@ -7,6 +7,7 @@ import com.mojang.brigadier.builder.LiteralArgumentBuilder;
 import com.mojang.brigadier.builder.RequiredArgumentBuilder;
 import io.ib67.sfcraft.config.SFConfig;
 import io.ib67.sfcraft.geoip.GeoIPService;
+import io.ib67.sfcraft.message.SFMessageDecorator;
 import io.ib67.sfcraft.registry.event.RandomEventRegistry;
 import io.ib67.sfcraft.event.SFRandomEventRegistry;
 import lombok.Getter;
@@ -16,6 +17,7 @@ import net.fabricmc.fabric.api.command.v2.CommandRegistrationCallback;
 import net.fabricmc.fabric.api.event.lifecycle.v1.ServerLifecycleEvents;
 import net.fabricmc.fabric.api.networking.v1.ServerPlayConnectionEvents;
 import net.minecraft.command.CommandRegistryAccess;
+import net.minecraft.network.message.MessageDecorator;
 import net.minecraft.server.MinecraftServer;
 import net.minecraft.server.command.CommandManager;
 import net.minecraft.server.command.ServerCommandSource;
@@ -42,6 +44,8 @@ public class SFCraft implements ModInitializer {
     private String updateLog;
     @Getter
     private RandomEventRegistry randomEventRegistry;
+    @Getter
+    private MessageDecorator messageDecorator;
 
     @Override
     @SneakyThrows
@@ -56,15 +60,22 @@ public class SFCraft implements ModInitializer {
         motd = loadMotd();
         updateLog = loadUpdateLog();
         geoIPService = new GeoIPService();
-        this.setupRandomEvents();
+
+        randomEventRegistry = setupRandomEvents();
+        messageDecorator = setupMessageDecorator();
 
         ServerPlayConnectionEvents.JOIN.register(listener::onPlayerJoin);
         CommandRegistrationCallback.EVENT.register(this::registerCommands);
         ServerLifecycleEvents.SERVER_STARTED.register(this::onServerStarted);
+
     }
 
-    private void setupRandomEvents() {
+    private MessageDecorator setupMessageDecorator() {
-        randomEventRegistry = new SFRandomEventRegistry();
+        return new SFMessageDecorator();
+    }
+
+    private SFRandomEventRegistry setupRandomEvents() {
+        return new SFRandomEventRegistry();
     }
 
     private void onServerStarted(MinecraftServer minecraftServer) {
@@ -135,5 +146,4 @@ public class SFCraft implements ModInitializer {
                 .executes(handler::listOffline)
         );
     }
-
 }

src/main/java/io/ib67/sfcraft/event/SFRandomEventRegistry.java

@@ -10,7 +10,7 @@ public class SFRandomEventRegistry extends SimpleRandomEventRegistry {
         registerEvent(LongNightEvent::new, World.OVERWORLD
                 , world -> !LongNightEvent.isRunning()
                         && world.getTimeOfDay() % 24000 == 18000
-                        && world.getRandom().nextBetween(0,100) < 15); // At midnight
+                        && world.getRandom().nextBetween(0,100) < 5); // At midnight
         registerEvent(DawnAfterLongNightEvent::new, World.OVERWORLD
                 , world -> world.getTimeOfDay() % 22200 == 0); // At dawn
     }

src/main/java/io/ib67/sfcraft/message/SFMessageDecorator.java

@@ -0,0 +1,9 @@
+package io.ib67.sfcraft.message;
+
+import io.ib67.sfcraft.message.feature.SendLocationFeature;
+
+public class SFMessageDecorator extends SimpleMessageDecorator {
+    public SFMessageDecorator() {
+        registerDecorator(new SendLocationFeature());
+    }
+}

src/main/java/io/ib67/sfcraft/message/SimpleMessageDecorator.java

@@ -0,0 +1,29 @@
+package io.ib67.sfcraft.message;
+
+import net.minecraft.network.message.MessageDecorator;
+import net.minecraft.server.network.ServerPlayerEntity;
+import net.minecraft.text.Text;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class SimpleMessageDecorator implements MessageDecorator {
+    protected final List<MessageDecorator> decorators = new ArrayList<>();
+
+    protected SimpleMessageDecorator() {
+
+    }
+
+    protected void registerDecorator(MessageDecorator decorator) {
+        decorators.add(decorator);
+    }
+
+    @Override
+    public Text decorate(@Nullable ServerPlayerEntity sender, Text message) {
+        for (MessageDecorator decorator : decorators) {
+            message = decorator.decorate(sender, message);
+        }
+        return message;
+    }
+}

src/main/java/io/ib67/sfcraft/message/feature/SendLocationFeature.java

@@ -0,0 +1,59 @@
+package io.ib67.sfcraft.message.feature;
+
+import io.ib67.sfcraft.Helper;
+import net.minecraft.network.message.MessageDecorator;
+import net.minecraft.registry.RegistryKey;
+import net.minecraft.server.network.ServerPlayerEntity;
+import net.minecraft.text.ClickEvent;
+import net.minecraft.text.Text;
+import net.minecraft.world.World;
+import org.jetbrains.annotations.Nullable;
+
+public class SendLocationFeature implements MessageDecorator {
+    @Override
+    public Text decorate(@Nullable ServerPlayerEntity sender, Text message) {
+        var text = message.getLiteralString().trim();
+        if (text == null) {
+            return message;
+        }
+        if (text.trim().equals(".xyz")) {
+            return generateLocText(sender);
+        }
+        var result = Text.literal("");
+        var head = 0;
+        var i = text.indexOf(".xyz");
+        while (i != -1) {
+            result.append(text.substring(0, i).trim());
+            result.append(generateLocText(sender));
+            head = i + 4;
+            i = text.indexOf(".xyz", head + 1);
+        }
+        result.append(text.substring(head).trim());
+        return result;
+    }
+
+    private static Text generateLocText(ServerPlayerEntity sender) {
+        if (sender == null) return Text.of(" (invalid position) ");
+        var x = sender.getBlockPos().getX();
+        var y = sender.getBlockPos().getY();
+        var z = sender.getBlockPos().getZ();
+        var key = sender.getServerWorld().getRegistryKey();
+        var world = translate(key);
+        return Text
+                .literal(" " + x + ", " + y + ", " + z + world + " ")
+                .withColor(Helper.fromRgb(63, 254, 254))
+                .styled(style -> style.withClickEvent(new ClickEvent(ClickEvent.Action.RUN_COMMAND, "/gps " + key + " " + x + " " + y + " " + z)));
+    }
+
+    private static String translate(RegistryKey<World> registryKey) {
+        if (registryKey == World.END) {
+            return " (末地)";
+        } else if (registryKey == World.NETHER) {
+            return " (地狱)";
+        } else if (registryKey == World.OVERWORLD) {
+            return "";
+        } else {
+            return " (未知)";
+        }
+    }
+}

src/main/java/io/ib67/sfcraft/mixin/server/ServerPlayNetworkHandlerMixin.java

@@ -0,0 +1,27 @@
+package io.ib67.sfcraft.mixin.server;
+
+import io.ib67.sfcraft.SFCraft;
+import net.minecraft.network.message.MessageChainTaskQueue;
+import net.minecraft.network.message.MessageDecorator;
+import net.minecraft.network.message.SignedMessage;
+import net.minecraft.server.MinecraftServer;
+import net.minecraft.server.network.ServerPlayNetworkHandler;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Overwrite;
+import org.spongepowered.asm.mixin.injection.*;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+import java.util.concurrent.CompletableFuture;
+import java.util.function.Consumer;
+
+@Mixin(ServerPlayNetworkHandler.class)
+public abstract class ServerPlayNetworkHandlerMixin {
+    /**
+     * @author icybear
+     * @reason small method, provide custom one
+     */
+    @Redirect(method = "method_44900", at = @At(value = "INVOKE", target = "Lnet/minecraft/server/MinecraftServer;getMessageDecorator()Lnet/minecraft/network/message/MessageDecorator;"))
+    public MessageDecorator getMessageDecorator(MinecraftServer instance) {
+        return SFCraft.getInstance().getMessageDecorator();
+    }
+}

src/main/resources/sfcraft.mixins.json

@@ -8,6 +8,7 @@
   "client": [
   ],
   "server": [
+    "server.ServerPlayNetworkHandlerMixin",
     "server.bridge.ServerWorldBridge",
     "server.SleepManagerMixin",
     "server.ServerWorldMixin",