feat: head item maker

src/main/java/in/arcadelabs/labaide/item/HeadBuilder.java

@@ -0,0 +1,112 @@
+/*
+ *                LabAide - Common utility library for our products.
+ *                Copyright (C) 2022  ArcadeLabs Production.
+ *
+ *       This program is free software: you can redistribute it and/or modify
+ *       it under the terms of the GNU General Public License as published by
+ *       the Free Software Foundation, either version 3 of the License, or
+ *       (at your option) any later version.
+ *
+ *       This program is distributed in the hope that it will be useful,
+ *       but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *       GNU General Public License for more details.
+ *
+ *       You should have received a copy of the GNU General Public License
+ *       along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package in.arcadelabs.labaide.item;
+
+import in.arcadelabs.labaide.logger.Logger;
+import net.kyori.adventure.text.Component;
+import net.kyori.adventure.text.format.NamedTextColor;
+
+import java.io.BufferedOutputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.DataOutput;
+import java.io.DataOutputStream;
+import java.io.IOException;
+import java.util.Base64;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.UUID;
+import java.util.zip.GZIPOutputStream;
+
+/**
+ * The type Skull maker.
+ *
+ * @author Schottky
+ * <a href="https://www.spigotmc.org/threads/player-skulls-without-reflection-nms-or-unsafe.458015/">Original code snippet.</a>
+ */
+@SuppressWarnings("unused")
+public class HeadBuilder {
+  private static final int TYPE_COMPOUND = 10;
+  private static final int TYPE_LIST = 9;
+  private static final int TYPE_STRING = 8;
+  private static final int END_MARK = 0;
+  private final Logger logger;
+  private final Logger.Level level;
+  public HeadBuilder(final Logger logger, final Logger.Level level) {
+    this.logger = logger;
+    this.level = level;
+  }
+
+  private static void write(DataOutput output, String value) throws IOException {
+    output.writeByte(TYPE_COMPOUND);
+    output.writeUTF("");
+
+    output.writeByte(TYPE_COMPOUND);
+    output.writeUTF("SkullProfile");
+
+    output.writeByte(TYPE_STRING);
+    output.writeUTF("Id");
+    output.writeUTF(UUID.randomUUID().toString());
+
+    output.writeByte(TYPE_COMPOUND);
+    output.writeUTF("Properties");
+
+    output.writeByte(TYPE_LIST);
+    output.writeUTF("textures");
+
+    output.writeByte(TYPE_COMPOUND);
+    output.writeInt(1);
+
+    output.writeByte(TYPE_STRING);
+    output.writeUTF("Value");
+    output.writeUTF(value);
+
+    output.writeByte(END_MARK);
+
+    output.writeByte(END_MARK);
+
+    output.writeByte(END_MARK);
+
+    output.writeByte(END_MARK);
+  }
+
+  /**
+   * Create skull texture.
+   *
+   * @param value the base64 encoded skull texture value
+   * @return the skull texture map
+   */
+  public Map<String, Object> createSkullMap(String value) {
+    try {
+      final ByteArrayOutputStream out = new ByteArrayOutputStream();
+      final DataOutputStream dos = new DataOutputStream(new BufferedOutputStream(new GZIPOutputStream(out)));
+      write(dos, value);
+      dos.close();
+      final String internal = Base64.getEncoder().encodeToString(out.toByteArray());
+      final Map<String, Object> map = new HashMap<>();
+      map.put("internal", internal);
+      map.put("meta-type", "SKULL");
+      map.put("==", "ItemMeta");
+      return map;
+    } catch (IOException e) {
+      this.logger.log(level, Component.text("Invalid skull texture value.", NamedTextColor.DARK_PURPLE));
+      this.logger.log(level, Component.text(e.getMessage(), NamedTextColor.DARK_PURPLE), e.fillInStackTrace());
+      return null;
+    }
+  }
+}