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Library for easy creation of GUIs for Bukkit plugins.
There is a newer version: 3.1.11
/**
 * MIT License
 *
 * Copyright (c) 2021 TriumphTeam
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package dev.triumphteam.gui.components.util;

import com.google.gson.Gson;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import org.bukkit.Material;
import org.bukkit.inventory.ItemStack;
import org.jetbrains.annotations.NotNull;

import java.util.Base64;

public final class SkullUtil {

    /**
     * The main SKULL material for the version
     */
    private static final Material SKULL = getSkullMaterial();
    private static final Gson GSON = new Gson();

    /**
     * Gets the correct {@link Material} for the version
     *
     * @return The correct SKULL {@link Material}
     */
    private static Material getSkullMaterial() {
        if (VersionHelper.IS_ITEM_LEGACY) {
            return Material.valueOf("SKULL_ITEM");
        }

        return Material.PLAYER_HEAD;
    }

    /**
     * Create a player skull
     *
     * @return player skull
     */
    @SuppressWarnings("deprecation")
    public static ItemStack skull() {
        return VersionHelper.IS_ITEM_LEGACY ? new ItemStack(SKULL, 1, (short) 3) : new ItemStack(SKULL);
    }

    /**
     * Checks if an {@link ItemStack} is a player skull
     *
     * @param item item to check
     * @return whether the item is a player skull
     */
    @SuppressWarnings("deprecation")
    public static boolean isPlayerSkull(@NotNull final ItemStack item) {
        if (VersionHelper.IS_ITEM_LEGACY) {
            return item.getType() == SKULL && item.getDurability() == (short) 3;
        }

        return item.getType() == SKULL;
    }

    /**
     * Decode a base64 string and extract the url of the skin. Example:
     * 

     * - Base64: {@code eyJ0ZXh0dXJlcyI6eyJTS0lOIjp7InVybCI6Imh0dHA6Ly90ZXh0dXJlcy5taW5lY3JhZnQubmV0L3RleHR1cmUvZGNlYjE3MDhkNTQwNGVmMzI2MTAzZTdiNjA1NTljOTE3OGYzZGNlNzI5MDA3YWM5YTBiNDk4YmRlYmU0NjEwNyJ9fX0=}
     * 

     * - JSON: {@code {"textures":{"SKIN":{"url":"http://textures.minecraft.net/texture/dceb1708d5404ef326103e7b60559c9178f3dce729007ac9a0b498bdebe46107"}}}}
     * 

     * - Result: {@code http://textures.minecraft.net/texture/dceb1708d5404ef326103e7b60559c9178f3dce729007ac9a0b498bdebe46107}
     * @param base64Texture the texture
     * @return the url of the texture if found, otherwise {@code null}
     */
    public static String getSkinUrl(String base64Texture) {
        final String decoded = new String(Base64.getDecoder().decode(base64Texture));
        final JsonObject object = GSON.fromJson(decoded, JsonObject.class);

        final JsonElement textures = object.get("textures");

        if (textures == null) {
            return null;
        }

        final JsonElement skin = textures.getAsJsonObject().get("SKIN");

        if (skin == null) {
            return null;
        }

        final JsonElement url = skin.getAsJsonObject().get("url");
        return url == null ? null : url.getAsString();
    }

}