Fix MC-257487

src/main/java/io/github/rektroth/whiteout/mixin/entity/boss/dragon/EnderDragonFightAccessor.java

@@ -0,0 +1,22 @@
+/*
+ * Patch for MC-257487
+ * 
+ * Authored for CraftBukkit/Spigot by Jake Potrebic <[email protected]> on November 12, 2022.
+ * Ported to Fabric by Rektroth <[email protected]> on October 12, 2023.
+ */
+
+package io.github.rektroth.whiteout.mixin.entity.boss.dragon;
+
+import net.minecraft.entity.boss.ServerBossBar;
+import net.minecraft.entity.boss.dragon.EnderDragonFight;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.gen.Accessor;
+
+@Mixin(EnderDragonFight.class)
+public interface EnderDragonFightAccessor {
+	@Accessor("bossBar")
+	public ServerBossBar getBossBar();
+
+	@Accessor("bossBar")
+	public void setBossBar(ServerBossBar bossBar);
+}

src/main/java/io/github/rektroth/whiteout/mixin/entity/boss/dragon/EnderDragonFightMixin.java

@@ -0,0 +1,47 @@
+/*
+ * Patch for MC-257487
+ * 
+ * Authored for CraftBukkit/Spigot by Jake Potrebic <[email protected]> on November 12, 2022.
+ * Ported to Fabric by Rektroth <[email protected]> on October 12, 2023.
+ */
+
+package io.github.rektroth.whiteout.mixin.entity.boss.dragon;
+
+import io.github.rektroth.whiteout.mixin.entity.boss.dragon.EnderDragonFightAccessor;
+import net.minecraft.entity.boss.BossBar;
+import net.minecraft.entity.boss.ServerBossBar;
+import net.minecraft.entity.boss.dragon.EnderDragonEntity;
+import net.minecraft.entity.boss.dragon.EnderDragonFight;
+import net.minecraft.text.Text;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.Redirect;
+
+@Mixin(EnderDragonFight.class)
+public class EnderDragonFightMixin {
+	private static final Text DEFAULT_BOSS_EVENT_NAME = Text.translatable("entity.minecraft.ender_dragon");
+
+	@Inject(at = @At("HEAD"), method = "<init>")
+	private void fixBossBar() {
+		((EnderDragonFightAccessor)((EnderDragonFight)(Object)this)).setBossBar((ServerBossBar)(new ServerBossBar(DEFAULT_BOSS_EVENT_NAME, BossBar.Color.PINK, BossBar.Style.PROGRESS)).setDragonMusic(true).setThickenFog(true));
+	}
+
+	@Inject(at = @At("TAIL"), method = "updateFight(Lnet/minecraft/entity/boss/dragon/EnderDragonEntity;)V")
+	private void fixedCustomNameCheck(EnderDragonEntity dragon) {
+		ServerBossBar bossBar = ((EnderDragonFightAccessor)((EnderDragonFight)(Object)this)).getBossBar();
+
+		if (dragon.hasCustomName()) {
+			bossBar.setName(dragon.getDisplayName());
+		} else {
+			bossBar.setName(DEFAULT_BOSS_EVENT_NAME);
+		}
+
+		((EnderDragonFightAccessor)((EnderDragonFight)(Object)this)).setBossBar(bossBar);
+	}
+
+	@Redirect(at = @At(value = "INVOKE", target = "Lnet/minecraft/entity/boss/dragon/EnderDragonEntity;hasCustomName()Z"), method = "updateFight(Lnet/minecraft/entity/boss/dragon/EnderDragonEntity;)V")
+	private boolean skipBadCustomNameCheck() {
+		return false;
+	}
+}