server resource pack spoofing

src/client/java/autumnvn/autumn/mixin/client/ResourcePackSendS2CPacketMixin.java

@@ -0,0 +1,32 @@
+package autumnvn.autumn.mixin.client;
+
+import autumnvn.autumn.AutumnClient;
+import net.minecraft.client.network.ServerInfo;
+import net.minecraft.network.packet.c2s.common.ResourcePackStatusC2SPacket;
+import net.minecraft.network.packet.s2c.common.ResourcePackSendS2CPacket;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+import java.util.Objects;
+import java.util.UUID;
+
+@Mixin(ResourcePackSendS2CPacket.class)
+public class ResourcePackSendS2CPacketMixin {
+
+    @Shadow
+    public UUID id() {
+        return null;
+    }
+
+    // ServerResourcePackSpoofing
+    @Inject(method = "apply*", at = @At("HEAD"), cancellable = true)
+    private void apply(CallbackInfo ci) {
+        if (Objects.requireNonNull(AutumnClient.client.getCurrentServerEntry()).getResourcePackPolicy() == ServerInfo.ResourcePackPolicy.DISABLED) {
+            Objects.requireNonNull(AutumnClient.client.getNetworkHandler()).sendPacket(new ResourcePackStatusC2SPacket(id(), ResourcePackStatusC2SPacket.Status.SUCCESSFULLY_LOADED));
+            ci.cancel();
+        }
+    }
+}

src/client/resources/autumn.client.mixins.json

@@ -21,6 +21,7 @@
     "MinecraftClientMixin",
     "OptionsScreenMixin",
     "PlayerListHudMixin",
+    "ResourcePackSendS2CPacketMixin",
     "SimpleOptionMixin",
     "SplashOverlayMixin",
     "TitleScreenMixin",