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src/icons.js

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+'use strict';
+
+/*
+ * icons.js – echte Minecraft-Item-Icons
+ * -------------------------------------
+ * Die Original-Texturen werden aus der bereits heruntergeladenen client.jar
+ * des Nutzers extrahiert (also aus seinen eigenen Spieldateien) und lokal
+ * als Icons abgelegt. Es werden keine fremden Assets mitgeliefert.
+ */
+
+const fs = require('fs');
+const path = require('path');
+const forge = require('./forge');
+
+// Auswahl gut erkennbarer 16x16-Texturen (Pfade im client.jar)
+const WANTED = [
+  ['grass', 'block/grass_block_side.png', 'Grasblock'],
+  ['dirt', 'block/dirt.png', 'Erde'],
+  ['stone', 'block/cobblestone.png', 'Bruchstein'],
+  ['planks', 'block/oak_planks.png', 'Holzbretter'],
+  ['tnt', 'block/tnt_side.png', 'TNT'],
+  ['obsidian', 'block/obsidian.png', 'Obsidian'],
+  ['netherrack', 'block/netherrack.png', 'Netherrack'],
+  ['crafting', 'block/crafting_table_front.png', 'Werkbank'],
+  ['furnace', 'block/furnace_front.png', 'Ofen'],
+  ['bookshelf', 'block/bookshelf.png', 'Bücherregal'],
+  ['diamondblock', 'block/diamond_block.png', 'Diamantblock'],
+  ['goldblock', 'block/gold_block.png', 'Goldblock'],
+  ['emeraldblock', 'block/emerald_block.png', 'Smaragdblock'],
+  ['redstoneblock', 'block/redstone_block.png', 'Redstoneblock'],
+  ['diamond', 'item/diamond.png', 'Diamant'],
+  ['emerald', 'item/emerald.png', 'Smaragd'],
+  ['gold', 'item/gold_ingot.png', 'Goldbarren'],
+  ['iron', 'item/iron_ingot.png', 'Eisenbarren'],
+  ['redstone', 'item/redstone.png', 'Redstone'],
+  ['coal', 'item/coal.png', 'Kohle'],
+  ['sword', 'item/diamond_sword.png', 'Diamantschwert'],
+  ['pickaxe', 'item/diamond_pickaxe.png', 'Diamantspitzhacke'],
+  ['axe', 'item/diamond_axe.png', 'Diamantaxt'],
+  ['bow', 'item/bow.png', 'Bogen'],
+  ['apple', 'item/apple.png', 'Apfel'],
+  ['goldenapple', 'item/golden_apple.png', 'Goldener Apfel'],
+  ['book', 'item/book.png', 'Buch'],
+  ['enchantedbook', 'item/enchanted_book.png', 'Verzaubertes Buch'],
+  ['map', 'item/map.png', 'Karte'],
+  ['star', 'item/nether_star.png', 'Netherstern'],
+  ['endereye', 'item/ender_eye.png', 'Enderauge'],
+  ['enderpearl', 'item/ender_pearl.png', 'Enderperle'],
+  ['blaze', 'item/blaze_powder.png', 'Lohenstaub'],
+  ['xp', 'item/experience_bottle.png', 'Erfahrungsfläschchen'],
+  ['cake', 'item/cake.png', 'Kuchen'],
+  ['bucket', 'item/water_bucket.png', 'Wassereimer'],
+  ['lava', 'item/lava_bucket.png', 'Lavaeimer'],
+  ['tnt_item', 'item/gunpowder.png', 'Schwarzpulver'],
+];
+
+// sucht die neueste vorhandene client.jar (auch im Datenordner vor der Umbenennung)
+function findClientJars(sharedDirs) {
+  const jars = [];
+  for (const shared of sharedDirs) {
+    const vdir = path.join(shared, 'versions');
+    if (!fs.existsSync(vdir)) continue;
+    for (const entry of fs.readdirSync(vdir, { withFileTypes: true })) {
+      if (!entry.isDirectory()) continue;
+      const jar = path.join(vdir, entry.name, entry.name + '.jar');
+      try {
+        if (fs.existsSync(jar) && fs.statSync(jar).size > 1024 * 1024) {
+          jars.push({ version: entry.name, path: jar, mtime: fs.statSync(jar).mtimeMs });
+        }
+      } catch { /* überspringen */ }
+    }
+  }
+  jars.sort((a, b) => b.mtime - a.mtime);
+  return jars;
+}
+
+/*
+ * Extrahiert die Texturen in <outDir>. Gibt die Liste der gefundenen Icons zurück.
+ */
+function extractIcons(sharedDirs, outDir) {
+  const jars = findClientJars(sharedDirs);
+  if (!jars.length) return { ok: false, reason: 'no-jar' };
+
+  const jar = jars[0];
+  const buf = fs.readFileSync(jar.path);
+  const zip = forge.readZipIndex(buf);
+  fs.mkdirSync(outDir, { recursive: true });
+
+  const found = [];
+  for (const [key, rel, label] of WANTED) {
+    const entry = zip['assets/minecraft/textures/' + rel];
+    if (!entry) continue;
+    try {
+      const png = forge.readZipEntry(buf, entry);
+      // sehr große Dateien überspringen (animierte Texturen sind gestreckt)
+      if (png.length > 64 * 1024) continue;
+      const dest = path.join(outDir, key + '.png');
+      fs.writeFileSync(dest, png);
+      found.push({ key, label, file: dest });
+    } catch { /* Textur überspringen */ }
+  }
+  return { ok: true, version: jar.version, count: found.length, icons: found };
+}
+
+// liest die extrahierten Icons als data:-URIs (für die Anzeige)
+function listIcons(outDir) {
+  if (!fs.existsSync(outDir)) return [];
+  const labels = Object.fromEntries(WANTED.map(([k, , l]) => [k, l]));
+  return fs.readdirSync(outDir)
+    .filter((f) => f.endsWith('.png'))
+    .map((f) => {
+      const key = path.basename(f, '.png');
+      try {
+        const data = fs.readFileSync(path.join(outDir, f)).toString('base64');
+        return { key, label: labels[key] || key, dataUri: 'data:image/png;base64,' + data };
+      } catch { return null; }
+    })
+    .filter(Boolean);
+}
+
+module.exports = { extractIcons, listIcons, findClientJars, WANTED };