Add UrlFallbackOption

api/src/main/java/org/geysermc/geyser/api/pack/ResourcePack.java

@@ -83,7 +83,7 @@ public interface ResourcePack {
 
     /**
      * Returns a {@link Builder} for a resource pack.
-     * It can be used to set a content key, or a default subpack.
+     * It can be used to set a content key.
      *
      * @param codec the {@link PackCodec} to base the builder on
      * @return a {@link Builder} to build a resource pack.
@@ -93,8 +93,7 @@ public interface ResourcePack {
     }
 
     /**
-     * A builder for a resource pack. It allows providing a content key manually, or
-     * setting a default subpack.
+     * A builder for a resource pack. It allows providing a content key manually.
      */
     interface Builder {
 

api/src/main/java/org/geysermc/geyser/api/pack/option/ResourcePackOption.java

@@ -54,7 +54,8 @@ public interface ResourcePackOption<T> {
 
     enum Type {
         SUBPACK,
-        PRIORITY
+        PRIORITY,
+        FALLBACK
     }
 
 }

api/src/main/java/org/geysermc/geyser/api/pack/option/UrlFallbackOption.java

@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 2024 GeyserMC. http://geysermc.org
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * @author GeyserMC
+ * @link https://github.com/GeyserMC/Geyser
+ */
+
+package org.geysermc.geyser.api.pack.option;
+
+import org.geysermc.geyser.api.GeyserApi;
+
+/**
+ * Can be used for resource packs using the {@link org.geysermc.geyser.api.pack.UrlPackCodec}.
+ * When a Bedrock client is unable to download a resource pack from a URL, Geyser will, by default,
+ * serve the resource pack over raknet (as packs are served with the {@link org.geysermc.geyser.api.pack.PathPackCodec}).
+ * This option can be used to disable that behavior, and disconnect the player instead.
+ */
+public interface UrlFallbackOption extends ResourcePackOption<Boolean> {
+
+    UrlFallbackOption TRUE = fallback(true);
+    UrlFallbackOption FALSE = fallback(false);
+
+    /**
+     * Whether to fall back to serving packs over the raknet connection
+     * @param fallback whether to fall back
+     * @return a UrlFallbackOption with the specified behavior
+     */
+    static UrlFallbackOption fallback(boolean fallback) {
+        return GeyserApi.api().provider(UrlFallbackOption.class, fallback);
+    }
+
+}

core/src/main/java/org/geysermc/geyser/event/type/SessionLoadResourcePacksEventImpl.java

@@ -188,22 +188,20 @@ public class SessionLoadResourcePacksEventImpl extends SessionLoadResourcePacksE
 
     // Helper methods to get the options for a ResourcePack
 
-    private double priority(GeyserResourcePack pack) {
-        OptionHolder holder = options.get(pack.uuid());
-        OptionHolder defaultHolder = packs.get(pack.uuid()).optionHolder();
+    public <T> T getValue(UUID uuid, ResourcePackOption.Type type, T defaultValue) {
+        OptionHolder holder = options.get(uuid);
+        OptionHolder defaultHolder = packs.get(uuid).optionHolder();
         Objects.requireNonNull(defaultHolder); // should never be null
 
-        return OptionHolder.getWithFallbacks(ResourcePackOption.Type.PRIORITY,
-            holder, defaultHolder, 5);
+        return OptionHolder.getWithFallbacks(type, holder, defaultHolder, defaultValue);
+    }
+
+    private double priority(GeyserResourcePack pack) {
+        return getValue(pack.uuid(), ResourcePackOption.Type.PRIORITY, 5);
     }
 
     private String subpackName(GeyserResourcePack pack) {
-        OptionHolder holder = options.get(pack.uuid());
-        OptionHolder defaultHolder = packs.get(pack.uuid()).optionHolder();
-        Objects.requireNonNull(defaultHolder); // should never be null
-
-        return OptionHolder.getWithFallbacks(ResourcePackOption.Type.SUBPACK,
-            holder, defaultHolder, "");
+        return getValue(pack.uuid(), ResourcePackOption.Type.SUBPACK, "");
     }
 
     // Helper method to validate a pack

core/src/main/java/org/geysermc/geyser/network/UpstreamPacketHandler.java

@@ -60,6 +60,7 @@ import org.geysermc.geyser.api.pack.PackCodec;
 import org.geysermc.geyser.api.pack.ResourcePack;
 import org.geysermc.geyser.api.pack.ResourcePackManifest;
 import org.geysermc.geyser.api.pack.UrlPackCodec;
+import org.geysermc.geyser.api.pack.option.ResourcePackOption;
 import org.geysermc.geyser.event.type.SessionLoadResourcePacksEventImpl;
 import org.geysermc.geyser.pack.GeyserResourcePack;
 import org.geysermc.geyser.pack.ResourcePackHolder;
@@ -314,6 +315,11 @@ public class UpstreamPacketHandler extends LoggingPacketHandler {
         // If a remote pack ends up here, that usually implies that a client was not able to download the pack
         if (codec instanceof UrlPackCodec urlPackCodec) {
             ResourcePackLoader.testRemotePack(session, urlPackCodec, packet.getPackId(), packet.getPackVersion());
+
+            if (!resourcePackLoadEvent.getValue(pack.uuid(), ResourcePackOption.Type.FALLBACK, true)) {
+                session.disconnect("Unable to provide downloaded resource pack. Contact an administrator!");
+                return PacketSignal.HANDLED;
+            }
         }
 
         data.setChunkIndex(packet.getChunkIndex());

core/src/main/java/org/geysermc/geyser/pack/option/GeyserUrlFallbackOption.java

@@ -0,0 +1,52 @@
+/*
+ * Copyright (c) 2024 GeyserMC. http://geysermc.org
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * @author GeyserMC
+ * @link https://github.com/GeyserMC/Geyser
+ */
+
+package org.geysermc.geyser.pack.option;
+
+import org.checkerframework.checker.nullness.qual.NonNull;
+import org.geysermc.geyser.api.pack.ResourcePack;
+import org.geysermc.geyser.api.pack.UrlPackCodec;
+import org.geysermc.geyser.api.pack.option.UrlFallbackOption;
+
+public record GeyserUrlFallbackOption(Boolean enabled) implements UrlFallbackOption {
+
+    @Override
+    public @NonNull Type type() {
+        return Type.FALLBACK;
+    }
+
+    @Override
+    public @NonNull Boolean value() {
+        return enabled;
+    }
+
+    @Override
+    public void validate(@NonNull ResourcePack pack) {
+        if (!(pack.codec() instanceof UrlPackCodec)) {
+            throw new IllegalArgumentException("UrlFallbackOption cannot be set on resource packs that do not use" +
+                "the url pack codec!");
+        }
+    }
+}

core/src/main/java/org/geysermc/geyser/registry/loader/ResourcePackLoader.java

@@ -116,10 +116,11 @@ public class ResourcePackLoader implements RegistryLoader<Path, Map<UUID, Resour
             resourcePacks.add(skullResourcePack);
         }
 
-        @SuppressWarnings("deprecation")
+        //noinspection removal
         GeyserLoadResourcePacksEvent event = new GeyserLoadResourcePacksEvent(resourcePacks);
         GeyserImpl.getInstance().eventBus().fire(event);
 
+        //noinspection removal
         for (Path path : event.resourcePacks()) {
             try {
                 GeyserResourcePack pack = readPack(path).build();