new features

backend/src/services/upload.service.ts

@@ -0,0 +1,44 @@
+import path from 'path';
+import fs from 'fs';
+import logger from '../utils/logger';
+import { THUMBNAIL_DIR } from '../middleware/upload';
+
+let sharp: any = null;
+try {
+  sharp = require('sharp');
+} catch {
+  logger.warn('sharp not installed — thumbnail generation disabled');
+}
+
+async function generateThumbnail(filePath: string, mimeType: string): Promise<string | null> {
+  if (!sharp) return null;
+  if (!mimeType.startsWith('image/')) return null;
+
+  try {
+    const ext = path.extname(filePath);
+    const baseName = path.basename(filePath, ext);
+    const thumbPath = path.join(THUMBNAIL_DIR, `${baseName}_thumb.webp`);
+
+    await sharp(filePath)
+      .resize(200, 200, { fit: 'inside', withoutEnlargement: true })
+      .webp({ quality: 70 })
+      .toFile(thumbPath);
+
+    return thumbPath;
+  } catch (error) {
+    logger.error('Thumbnail generation failed', { filePath, error });
+    return null;
+  }
+}
+
+function deleteFile(filePath: string): void {
+  try {
+    if (fs.existsSync(filePath)) {
+      fs.unlinkSync(filePath);
+    }
+  } catch (error) {
+    logger.error('File deletion failed', { filePath, error });
+  }
+}
+
+export default { generateThumbnail, deleteFile };