From 80c2fc68aae23e11b190c681a9c77a526ec22c1c Mon Sep 17 00:00:00 2001
From: ToadDev <748280+Toad-Dev@users.noreply.github.com>
Date: Thu, 3 Jun 2021 21:54:28 -0700
Subject: [PATCH] Fix crash playing a music disc from drive on server.

#48
---
 .../fabric/mixin/MusicDiscItemAccessor.java          | 12 ++++++++++++
 .../shared/media/items/RecordMedia.java              |  7 ++++++-
 src/main/resources/computercraft.mixins.json         |  3 ++-
 3 files changed, 20 insertions(+), 2 deletions(-)
 create mode 100644 src/main/java/dan200/computercraft/fabric/mixin/MusicDiscItemAccessor.java

diff --git a/src/main/java/dan200/computercraft/fabric/mixin/MusicDiscItemAccessor.java b/src/main/java/dan200/computercraft/fabric/mixin/MusicDiscItemAccessor.java
new file mode 100644
index 000000000..77757a1ce
--- /dev/null
+++ b/src/main/java/dan200/computercraft/fabric/mixin/MusicDiscItemAccessor.java
@@ -0,0 +1,12 @@
+package dan200.computercraft.fabric.mixin;
+
+import net.minecraft.item.MusicDiscItem;
+import net.minecraft.sound.SoundEvent;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.gen.Accessor;
+
+@Mixin(MusicDiscItem.class)
+public interface MusicDiscItemAccessor {
+    @Accessor
+    SoundEvent getSound();
+}
diff --git a/src/main/java/dan200/computercraft/shared/media/items/RecordMedia.java b/src/main/java/dan200/computercraft/shared/media/items/RecordMedia.java
index 8fefda4c6..17c76ee1b 100644
--- a/src/main/java/dan200/computercraft/shared/media/items/RecordMedia.java
+++ b/src/main/java/dan200/computercraft/shared/media/items/RecordMedia.java
@@ -10,6 +10,7 @@ import javax.annotation.Nonnull;
 
 import dan200.computercraft.api.media.IMedia;
 
+import dan200.computercraft.fabric.mixin.MusicDiscItemAccessor;
 import net.minecraft.item.Item;
 import net.minecraft.item.ItemStack;
 import net.minecraft.item.MusicDiscItem;
@@ -42,6 +43,10 @@ public final class RecordMedia implements IMedia {
 
     @Override
     public SoundEvent getAudio(@Nonnull ItemStack stack) {
-        return ((MusicDiscItem) stack.getItem()).getSound();
+        Item item = stack.getItem();
+        if (!(item instanceof MusicDiscItem)) {
+            return null;
+        }
+        return ((MusicDiscItemAccessor) item).getSound();
     }
 }
diff --git a/src/main/resources/computercraft.mixins.json b/src/main/resources/computercraft.mixins.json
index c9ae3995a..09a5bc326 100644
--- a/src/main/resources/computercraft.mixins.json
+++ b/src/main/resources/computercraft.mixins.json
@@ -11,7 +11,8 @@
         "SignBlockEntityAccess",
         "SoundEventAccess",
         "WorldSavePathAccess",
-        "MixinServerPlayerInteractionManager"
+        "MixinServerPlayerInteractionManager",
+        "MusicDiscItemAccessor"
     ],
     "client": [
         "AffineTransformationAccess",