Added the ability to fetch heads directly from minecraft-heads.com wi…

…thout needing the texture value

src/main/java/com/bgsoftware/superiorskyblock/core/itemstack/ItemBuilder.java

@@ -77,7 +77,7 @@ public ItemBuilder asSkullOf(SuperiorPlayer superiorPlayer) {
 
     public ItemBuilder asSkullOf(String textureValue) {
         if (itemStack.getType() == Materials.PLAYER_HEAD.toBukkitType())
-            this.textureValue = textureValue;
+            this.textureValue = ItemSkulls.parseTexture(textureValue);
         return this;
     }
 

src/main/java/com/bgsoftware/superiorskyblock/core/itemstack/ItemSkulls.java

@@ -2,7 +2,9 @@
 
 import com.bgsoftware.common.config.CommentedConfiguration;
 import com.bgsoftware.superiorskyblock.SuperiorSkyblockPlugin;
+import com.bgsoftware.superiorskyblock.core.LazyReference;
 import com.bgsoftware.superiorskyblock.core.ServerVersion;
+import com.bgsoftware.superiorskyblock.core.itemstack.heads.MinecraftHeadsClient;
 import com.bgsoftware.superiorskyblock.core.logging.Log;
 import com.bgsoftware.superiorskyblock.core.serialization.Serializers;
 import com.bgsoftware.superiorskyblock.tag.CompoundTag;
@@ -21,6 +23,12 @@ public class ItemSkulls {
 
     private static final String NULL_PLAYER_TEXTURE = "eyJ0ZXh0dXJlcyI6eyJTS0lOIjp7InVybCI6Imh0dHA6Ly90ZXh0dXJlcy5taW5lY3JhZnQubmV0L3RleHR1cmUvYmFkYzA0OGE3Y2U3OGY3ZGFkNzJhMDdkYTI3ZDg1YzA5MTY4ODFlNTUyMmVlZWQxZTNkYWYyMTdhMzhjMWEifX19";
     private static final Map<String, String> entitySkullTextures = new HashMap<>();
+    private static final LazyReference<MinecraftHeadsClient> minecraftHeadsClient = new LazyReference<MinecraftHeadsClient>() {
+        @Override
+        protected MinecraftHeadsClient create() {
+            return new MinecraftHeadsClient();
+        }
+    };
 
     private ItemSkulls() {
 
@@ -44,7 +52,7 @@ public static void readTextures(SuperiorSkyblockPlugin plugin) {
         }
 
         for (String entityType : cfg.getConfigurationSection("").getKeys(false))
-            entitySkullTextures.put(entityType, cfg.getString(entityType));
+            entitySkullTextures.put(entityType, parseTexture(cfg.getString(entityType)));
     }
 
     public static ItemStack getPlayerHead(ItemStack itemStack, String texture) {
@@ -88,4 +96,10 @@ public static String getTexture(String entityType) {
         return entitySkullTextures.getOrDefault(entityType, "");
     }
 
+    public static String parseTexture(String texture) {
+        return MinecraftHeadsClient.getMinecraftHeadsTextureId(texture)
+                .map(textureId -> minecraftHeadsClient.get().getTexture(textureId))
+                .orElse(texture);
+    }
+
 }

src/main/java/com/bgsoftware/superiorskyblock/core/itemstack/heads/MinecraftHeadsClient.java

@@ -0,0 +1,74 @@
+package com.bgsoftware.superiorskyblock.core.itemstack.heads;
+
+import com.bgsoftware.superiorskyblock.core.DynamicArray;
+import com.bgsoftware.superiorskyblock.core.logging.Log;
+
+import javax.annotation.Nullable;
+import java.io.BufferedReader;
+import java.io.InputStreamReader;
+import java.net.URL;
+import java.net.URLConnection;
+import java.nio.charset.StandardCharsets;
+import java.util.ArrayList;
+import java.util.Base64;
+import java.util.Collections;
+import java.util.List;
+import java.util.Optional;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+public class MinecraftHeadsClient {
+
+    private static final Pattern MINECRAFT_HEADS_PATTERN = Pattern.compile("minecraft-heads:(\\d+)");
+    private static final int EXPECTED_HEADS_SIZE = 50_000;
+    private static final String MINECRAFT_HEADS_DATABASE_URL = "https://minecraft-heads.com/csv/2020-01-31-IUgRbJoHRbVhjKnOlkmH/Custom-Head-DB.csv";
+
+    public static Optional<Integer> getMinecraftHeadsTextureId(String texture) {
+        Matcher matcher = MINECRAFT_HEADS_PATTERN.matcher(texture);
+        return matcher.matches() ? Optional.of(Integer.parseInt(matcher.group(1))) : Optional.empty();
+    }
+
+    private final List<String> cachedHeads;
+
+    public MinecraftHeadsClient() {
+        this.cachedHeads = fetchHeadsDatabase();
+    }
+
+    @Nullable
+    public String getTexture(int id) {
+        int index = id - 1;
+        return index < cachedHeads.size() ? cachedHeads.get(index) : null;
+    }
+
+    private static List<String> fetchHeadsDatabase() {
+        DynamicArray<String> heads = new DynamicArray<>(EXPECTED_HEADS_SIZE);
+        boolean addedAnyHead = false;
+
+        try {
+            URLConnection connection = new URL(MINECRAFT_HEADS_DATABASE_URL).openConnection();
+            try (BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream(), StandardCharsets.UTF_8))) {
+                String texture;
+                while ((texture = reader.readLine()) != null) {
+                    String[] textureSegments = texture.split(";");
+                    if (textureSegments.length >= 4) {
+                        int id;
+                        try {
+                            id = Integer.parseInt(textureSegments[1]);
+                        } catch (NumberFormatException ignored) {
+                            continue;
+                        }
+                        String textureValue = textureSegments[3];
+                        String textureUrl = "{\"textures\":{\"SKIN\":{\"url\":\"http://textures.minecraft.net/texture/" + textureValue + "\"}}}";
+                        heads.set(id - 1, Base64.getEncoder().encodeToString(textureUrl.getBytes(StandardCharsets.UTF_8)));
+                        addedAnyHead = true;
+                    }
+                }
+            }
+        } catch (Exception error) {
+            Log.error(error, "Failed to obtain heads from minecraft-heads:");
+        }
+
+        return addedAnyHead ? heads.toList() : Collections.emptyList();
+    }
+
+}