chore: translate Japanese comments to English for better code readability

src/main.ts

@@ -8,7 +8,7 @@ const requestTimeout = config.request_timeout || 30000;
 
 const app = new Hono();
 
-// CORSミドルウェア: すべての制限を無効化
+// CORS middleware: Disable all restrictions
 app.use(
   '*',
   cors({
@@ -20,7 +20,7 @@ app.use(
   }),
 );
 
-// リクエストログミドルウェア
+// Request log middleware
 app.use('*', async (c, next) => {
   const start = Date.now();
   await next();
@@ -43,7 +43,7 @@ app.use('*', async (c, next) => {
   c.header('Server', 'THIS SERVER IS POWERED BY PENGUINS');
 });
 
-// ベースルート
+// Base route
 app.get('/', (c) => {
   const baseDomain = new URL(c.req.url).host;
   return c.text(
@@ -72,10 +72,10 @@ More info: /docs`,
   );
 });
 
-// APIルートグループ
+// API route group
 const apiRoutes = app.basePath('/api');
 
-// ルートを登録
+// Register routes
 import searchRoutes from './routes/search';
 import metaRoutes from './routes/meta';
 import metaWebRoutes from './routes/metaWeb';
@@ -90,7 +90,7 @@ apiRoutes.route('/download/sticker', stickerRoutes);
 apiRoutes.route('/download/emoji', emojiRoutes);
 app.route('/docs', docsRoutes);
 
-// サーバー起動
+// Start server
 const port = process.env.PORT || 3000;
 logger.info(`Server running on port ${port}`);
 Bun.serve({

src/routes/download/emoji.ts

@@ -10,7 +10,7 @@ const requestTimeout = config.request_timeout || 30000;
 
 const app = new Hono();
 
-// ZIPダウンロードエンドポイント
+// ZIP download endpoint
 app.get('/zip/:productId', async (c) => {
   const validDeviceTypes = ['ios', 'android'] as const;
   type DeviceType = (typeof validDeviceTypes)[number];
@@ -64,7 +64,7 @@ app.get('/zip/:productId', async (c) => {
   }
 });
 
-// 個別絵文字ダウンロードエンドポイント
+// Individual emoji download endpoint
 app.get('/single/:productId/:iconIndex', async (c) => {
   const validDeviceTypes = ['ios', 'android'] as const;
   type DeviceType = (typeof validDeviceTypes)[number];
@@ -98,7 +98,7 @@ app.get('/single/:productId/:iconIndex', async (c) => {
       },
     );
 
-    // GIF変換が必要な場合（アニメーションの場合のみ）
+    // If GIF conversion is needed (only for animations)
     if (gifFlag && !isStaticFlag) {
       const buffer = await response.arrayBuffer();
       const prefix = Math.random().toString(36).substring(2);
@@ -120,7 +120,7 @@ app.get('/single/:productId/:iconIndex', async (c) => {
 
       const gifBuffer = fs.readFileSync(outputPath);
 
-      // 一時ファイルをクリーンアップ
+      // Clean up temporary files
       fs.unlink(inputPath, () => {});
       fs.unlink(outputPath, () => {});
 
@@ -156,7 +156,7 @@ app.get('/single/:productId/:iconIndex', async (c) => {
   }
 });
 
-// 絵文字サムネイルダウンロードエンドポイント
+// Emoji thumbnail download endpoint
 app.get('/thumb/:productId', async (c) => {
   const productId: string = c.req.param('productId') || 'null';
   if (!/^[0-9a-f]+$/.test(productId)) return c.text('Invalid productId', 400);

src/routes/download/sticker.ts

@@ -10,7 +10,7 @@ const requestTimeout = config.request_timeout || 30000;
 
 const app = new Hono();
 
-// ZIPダウンロードエンドポイント
+// ZIP download endpoint
 app.get('/zip/:productId', async (c) => {
   const validDeviceTypes = ['ios', 'android'] as const;
   type DeviceType = (typeof validDeviceTypes)[number];
@@ -62,7 +62,7 @@ app.get('/zip/:productId', async (c) => {
   }
 });
 
-// 個別ステッカーダウンロードエンドポイント
+// Individual sticker download endpoint
 app.get('/single/:stickerId', async (c) => {
   const validDeviceTypes = ['ios', 'android'] as const;
   type DeviceType = (typeof validDeviceTypes)[number];
@@ -89,7 +89,7 @@ app.get('/single/:stickerId', async (c) => {
       },
     );
 
-    // GIF変換が必要な場合（アニメーションの場合のみ）
+    // If GIF conversion is needed (only for animations)
     if (gifFlag && !isStaticFlag) {
       const buffer = await response.arrayBuffer();
       const prefix = Math.random().toString(36).substring(2);
@@ -111,7 +111,7 @@ app.get('/single/:stickerId', async (c) => {
 
       const gifBuffer = fs.readFileSync(outputPath);
 
-      // 一時ファイルをクリーンアップ
+      // Clean up temporary files
       fs.unlink(inputPath, () => {});
       fs.unlink(outputPath, () => {});
 
@@ -125,7 +125,7 @@ app.get('/single/:stickerId', async (c) => {
       });
     }
 
-    // 通常の場合
+    // Normal case
     const allowedHeaders = ['Content-Type', 'ETag', 'Cache-Control', 'Last-Modified'];
     const filteredHeaders = new Headers();
     allowedHeaders.forEach((header) => {
@@ -152,7 +152,7 @@ app.get('/single/:stickerId', async (c) => {
   }
 });
 
-// サムネイルダウンロードエンドポイント
+// Thumbnail download endpoint
 app.get('/thumb/:productId', async (c) => {
   const productId: number = parseInt(c.req.param('productId') || '-1');
   if (productId === -1) return c.text('Invalid productId', 400);
@@ -189,7 +189,7 @@ app.get('/thumb/:productId', async (c) => {
   }
 });
 
-// 個別ステッカーサウンドダウンロードエンドポイント
+// Individual sticker sound download endpoint
 app.get('/sound/single/:stickerId', async (c) => {
   const validDeviceTypes = ['ios', 'android', 'pc'] as const;
   type DeviceType = (typeof validDeviceTypes)[number];
@@ -240,7 +240,7 @@ app.get('/sound/single/:stickerId', async (c) => {
   }
 });
 
-// サムネイルサウンドダウンロードエンドポイント
+// Thumbnail sound download endpoint
 app.get('/sound/thumb/:productId', async (c) => {
   const validDeviceTypes = ['ios', 'android', 'pc'] as const;
   type DeviceType = (typeof validDeviceTypes)[number];
@@ -288,7 +288,7 @@ app.get('/sound/thumb/:productId', async (c) => {
   }
 });
 
-// SOUND+(ANIMATION or STATIC) 動画化ダウンロードエンドポイント
+// SOUND+(ANIMATION or STATIC) video download endpoint
 app.get('/mp4/single/:stickerId', async (c) => {
   const validDeviceTypes = ['ios', 'android'] as const;
   type DeviceType = (typeof validDeviceTypes)[number];

src/routes/meta.ts

@@ -8,6 +8,7 @@ const requestTimeout = config.request_timeout || 30000;
 
 const app = new Hono();
 
+// Sticker metadata endpoint
 app.get('/sticker/:productId', async (c) => {
   const validDeviceTypes = ['ios', 'android', 'pc'] as const;
   type DeviceType = (typeof validDeviceTypes)[number];
@@ -52,6 +53,7 @@ app.get('/sticker/:productId', async (c) => {
   }
 });
 
+// Emoji metadata endpoint
 app.get('/emoji/:productId', async (c) => {
   const validDeviceTypes = ['ios', 'android'] as const;
   type DeviceType = (typeof validDeviceTypes)[number];

src/routes/metaWeb.ts

@@ -9,6 +9,7 @@ const requestTimeout = config.request_timeout || 30000;
 
 const app = new Hono();
 
+// Sticker web metadata endpoint
 app.get('/sticker/:productId', async (c) => {
   const productId: number = parseInt(c.req.param('productId') || '-1');
   if (productId === -1) return c.text('Invalid productId', 400);
@@ -43,6 +44,7 @@ app.get('/sticker/:productId', async (c) => {
   }
 });
 
+// Emoji web metadata endpoint
 app.get('/emoji/:productId', async (c) => {
   const productId: string = c.req.param('productId') || 'null';
   if (!/^[0-9a-f]+$/.test(productId)) return c.text('Invalid productId', 400);

src/routes/search.ts

@@ -8,11 +8,11 @@ const requestTimeout = config.request_timeout || 30000;
 
 const app = new Hono();
 
-// カテゴリタイプのバリデーション
+// Category type validation
 const validCategories = ['sticker', 'emoji', 'theme', 'family'] as const;
 type Category = (typeof validCategories)[number];
 
-// タイプのバリデーション
+// Type validation
 const validTypes = ['ALL', 'OFFICIAL', 'CREATORS', 'SUBSCRIPTION'] as const;
 type SearchType = (typeof validTypes)[number];
 
@@ -24,7 +24,7 @@ app.get('/', async (c) => {
     return c.text('Missing query parameter', 400);
   }
 
-  // カテゴリのバリデーション
+  // Category validation
   if (!validCategories.includes(queryParams.category as Category)) {
     return c.text('Invalid category', 400);
   }
@@ -36,9 +36,9 @@ app.get('/', async (c) => {
   const preferredLanguage = 'lang' in queryParams ? queryParams.lang : c.req.header('Accept-Language') || 'ja';
 
   try {
-    // LINE Store APIへのリクエスト
+    // Request to LINE Store API
     const response = await ky(`https://store.line.me/api/search/${queryParams.category}`, {
-      searchParams: queryParams, // クエリパラメータをそのまま渡す
+      searchParams: queryParams, // Pass query parameters as-is
       headers: {
         'Accept-Language': preferredLanguage,
         'User-Agent': config.userAgent.chromeWindows,
@@ -46,7 +46,7 @@ app.get('/', async (c) => {
       timeout: requestTimeout,
     });
 
-    // 許可するヘッダーをフィルタリング（Content-Length追加）
+    // Filter allowed headers (add Content-Length)
     const allowedHeaders = ['Date', 'Content-Type', 'ETag', 'Cache-Control'];
     const filteredHeaders = new Headers();