Fix some textures not being loaded to due being misaligned base64 data

src/main/java/moe/nea/firmament/mixins/TextureUnpackBase64PadPatch.java

@@ -0,0 +1,24 @@
+/*
+ * SPDX-FileCopyrightText: 2024 Linnea Gräf <nea@nea.moe>
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+package moe.nea.firmament.mixins;
+
+import com.llamalad7.mixinextras.injector.ModifyExpressionValue;
+import com.mojang.authlib.yggdrasil.YggdrasilMinecraftSessionService;
+import moe.nea.firmament.util.Base64Util;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+
+@Mixin(value = YggdrasilMinecraftSessionService.class, remap = false)
+public class TextureUnpackBase64PadPatch {
+    @ModifyExpressionValue(method = "unpackTextures",
+        remap = false,
+        at = @At(value = "INVOKE", target = "Lcom/mojang/authlib/properties/Property;value()Ljava/lang/String;"))
+    private String base64PadTexture(String original) {
+        if (original.length() % 4 == 0) return original;
+        return Base64Util.INSTANCE.padToValidBase64(original);
+    }
+}

src/main/kotlin/moe/nea/firmament/util/Base64Util.kt

@@ -0,0 +1,15 @@
+/*
+ * SPDX-FileCopyrightText: 2024 Linnea Gräf <nea@nea.moe>
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+package moe.nea.firmament.util
+
+object Base64Util {
+    fun String.padToValidBase64(): String {
+        val align = this.length % 4
+        if (align == 0) return this
+        return this + "=".repeat(4 - align)
+    }
+}

src/main/kotlin/moe/nea/firmament/util/item/SkullItemData.kt

@@ -23,6 +23,7 @@ import net.minecraft.component.type.ProfileComponent
 import net.minecraft.item.ItemStack
 import net.minecraft.item.Items
 import moe.nea.firmament.Firmament
+import moe.nea.firmament.util.Base64Util.padToValidBase64
 import moe.nea.firmament.util.assertTrueOr
 import moe.nea.firmament.util.json.DashlessUUIDSerializer
 import moe.nea.firmament.util.json.InstantAsLongSerializer
@@ -49,14 +50,11 @@ fun GameProfile.setTextures(textures: MinecraftTexturesPayloadKt) {
 }
 
 private val propertyTextures = "textures"
-fun String.padBase64(): String {
-    return this + "=".repeat((4 - (this.length % 4)) % 4)
-}
 
 fun ItemStack.setEncodedSkullOwner(uuid: UUID, encodedData: String) {
     assert(this.item == Items.PLAYER_HEAD)
     val gameProfile = GameProfile(uuid, "LameGuy123")
-    gameProfile.properties.put(propertyTextures, Property(propertyTextures, encodedData.padBase64()))
+    gameProfile.properties.put(propertyTextures, Property(propertyTextures, encodedData.padToValidBase64()))
     this.set(DataComponentTypes.PROFILE, ProfileComponent(gameProfile))
 }