Add custom textures to placed skulls

src/main/kotlin/moe/nea/firmament/features/texturepack/CustomSkyBlockTextures.kt

@@ -6,11 +6,21 @@
 
 package moe.nea.firmament.features.texturepack
 
+import com.mojang.authlib.GameProfile
+import com.mojang.authlib.minecraft.MinecraftProfileTexture
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable
+import net.minecraft.block.SkullBlock
+import net.minecraft.client.MinecraftClient
+import net.minecraft.client.render.RenderLayer
+import net.minecraft.client.texture.PlayerSkinProvider
 import net.minecraft.client.util.ModelIdentifier
+import net.minecraft.util.Identifier
 import moe.nea.firmament.events.CustomItemModelEvent
 import moe.nea.firmament.events.TickEvent
 import moe.nea.firmament.features.FirmamentFeature
 import moe.nea.firmament.gui.config.ManagedConfig
+import moe.nea.firmament.util.IdentityCharacteristics
+import moe.nea.firmament.util.item.decodeProfileTextureProperty
 import moe.nea.firmament.util.skyBlockId
 
 object CustomSkyBlockTextures : FirmamentFeature {
@@ -19,6 +29,7 @@ object CustomSkyBlockTextures : FirmamentFeature {
 
     object TConfig : ManagedConfig(identifier) {
         val enabled by toggle("enabled") { true }
+        val skullsEnabled by toggle("skulls-enabled") { true }
         val cacheDuration by integer("cache-duration", 0, 20) { 1 }
     }
 
@@ -32,8 +43,50 @@ object CustomSkyBlockTextures : FirmamentFeature {
             it.overrideModel = ModelIdentifier("firmskyblock", id.identifier.path, "inventory")
         }
         TickEvent.subscribe {
-            if (it.tickCount % TConfig.cacheDuration == 0)
+            if (it.tickCount % TConfig.cacheDuration == 0) {
                 CustomItemModelEvent.clearCache()
+                skullTextureCache.clear()
+            }
         }
     }
+
+    private val skullTextureCache = mutableMapOf<IdentityCharacteristics<GameProfile>, Any>()
+    private val sentinelPresentInvalid = Object()
+
+    val mcUrlRegex = "https?://textures.minecraft.net/texture/([a-fA-F0-9]+)".toRegex()
+    fun getSkullId(profile: GameProfile): String? {
+        val textures = profile.properties.get(PlayerSkinProvider.TEXTURES)
+        val textureProperty = textures.singleOrNull() ?: return null
+        val texture = decodeProfileTextureProperty(textureProperty) ?: return null
+        val textureUrl =
+            texture.textures[MinecraftProfileTexture.Type.SKIN]?.url ?: return null
+        val mcUrlData = mcUrlRegex.matchEntire(textureUrl) ?: return null
+        return mcUrlData.groupValues[1]
+    }
+
+    fun getSkullTexture(profile: GameProfile): Identifier? {
+        val id = getSkullId(profile) ?: return null
+        return Identifier("firmskyblock", "textures/placedskull/$id.png")
+    }
+
+    fun modifySkullTexture(
+        type: SkullBlock.SkullType?,
+        profile: GameProfile?,
+        cir: CallbackInfoReturnable<RenderLayer>
+    ) {
+        if (type != SkullBlock.Type.PLAYER) return
+        if (!TConfig.skullsEnabled) return
+        if (profile == null) return
+        val ic = IdentityCharacteristics(profile)
+
+        val n = skullTextureCache.getOrPut(ic) {
+            val id = getSkullTexture(profile) ?: return@getOrPut sentinelPresentInvalid
+            if (!MinecraftClient.getInstance().resourceManager.getResource(id).isPresent) {
+                return@getOrPut sentinelPresentInvalid
+            }
+            return@getOrPut id
+        }
+        if (n === sentinelPresentInvalid) return
+        cir.returnValue = RenderLayer.getEntityTranslucent(n as Identifier)
+    }
 }