feat: replace JSZip with archiver for ZIP file creation and streaming to disk

- Added archiver package to package.json
- Updated download-filtered-entries API to use archiver for creating ZIP files
- Streamlined ZIP file creation process and ensured proper error handling
- Improved logging for added audio files and ZIP file saving

package.json

@@ -13,6 +13,7 @@
     "@better-auth/drizzle-adapter": "^1.5.4",
     "@libsql/client": "^0.17.0",
     "@tailwindcss/postcss": "^4.2.1",
+    "archiver": "^7.0.0",
     "auth": "^1.5.3",
     "better-auth": "^1.4.19",
     "better-auth-localization": "^2.3.1",

src/app/api/download-filtered-entries/route.ts

@@ -1,13 +1,10 @@
 import { NextRequest, NextResponse } from 'next/server';
 import { downloadFilteredEntries } from '@/app/actions/download-filtered-entries';
-import JSZip from 'jszip';
+import archiver from 'archiver';
 import { join } from 'path';
-import { readFile, existsSync, writeFileSync, mkdirSync, readdirSync, unlinkSync, statSync } from 'fs';
+import { existsSync, mkdirSync, readdirSync, unlinkSync, statSync, createWriteStream } from 'fs';
-import { promisify } from 'util';
 import { requireAdmin } from '@/lib/auth';
 
-const readFileAsync = promisify(readFile);
-
 // Clean up old ZIP files older than 24 hours
 async function cleanupOldZips(downloadsDir: string, maxAgeHours: number = 24) {
   try {
@@ -72,19 +69,36 @@ export async function POST(request: NextRequest) {
     // Get filtered entries data from server action
     const result = await downloadFilteredEntries(datasetId, filters || {});
 
-    // Create ZIP on server
+    // Create filename with timestamp for uniqueness
-    const zip = new JSZip();
+    const timestamp = Date.now();
+    const fileName = `dataset-${datasetId}-export-${new Date().toISOString().split('T')[0]}-${timestamp}.zip`;
+    
+    const downloadsDir = join(process.cwd(), 'public', 'downloads');
+    
+    // Ensure downloads directory exists
+    try {
+      mkdirSync(downloadsDir, { recursive: true });
+    } catch (error) {
+      console.error('Error creating downloads directory:', error);
+    }
+
+    const filePath = join(downloadsDir, fileName);
+
+    // Create ZIP archive with streaming to disk
+    const output = createWriteStream(filePath);
+    const zip = archiver('zip', { zlib: { level: 9 } });
+
+    // Pipe archive to file
+    zip.pipe(output);
 
     // Add CSV file
-    zip.file('metadata.csv', result.csvContent);
+    zip.append(result.csvContent, { name: 'metadata.csv' });
 
     // Add metadata JSON
-    zip.file('filter-metadata.json', result.metadataContent);
+    zip.append(result.metadataContent, { name: 'filter-metadata.json' });
 
-    // Add audio files to 'audio' folder
+    // Add audio files to 'wavs' folder
     if (result.entries && result.entries.length > 0) {
-      const audioFolder = zip.folder('wavs');
-      if (audioFolder) {
       let filesAdded = 0;
       for (const entry of result.entries) {
         try {
@@ -98,8 +112,7 @@ export async function POST(request: NextRequest) {
           );
 
           if (existsSync(audioPath)) {
-              const fileBuffer = await readFileAsync(audioPath);
+            zip.file(audioPath, { name: `wavs/${entry.fileName}` });
-              zip.file(entry.fileName, fileBuffer);
             filesAdded++;
           } else {
             console.warn(`Audio file not found: ${audioPath}`);
@@ -110,32 +123,26 @@ export async function POST(request: NextRequest) {
         }
       }
       console.log(`Added ${filesAdded}/${result.entries.length} audio files to ZIP`);
-      }
     } else {
       console.warn('No entries to add audio files for');
     }
 
-    // Generate ZIP blob
+    // Finalize and wait for the archive to finish writing to disk
-    const zipBuffer = await zip.generateAsync({ type: 'nodebuffer' });
+    await new Promise<void>((resolve, reject) => {
-
+      output.on('close', () => {
-    // Save ZIP to public folder
-    const downloadsDir = join(process.cwd(), 'public', 'downloads');
-    
-    // Ensure downloads directory exists
-    try {
-      mkdirSync(downloadsDir, { recursive: true });
-    } catch (error) {
-      console.error('Error creating downloads directory:', error);
-    }
-
-    // Create filename with timestamp for uniqueness
-    const timestamp = Date.now();
-    const fileName = `dataset-${datasetId}-export-${new Date().toISOString().split('T')[0]}-${timestamp}.zip`;
-    const filePath = join(downloadsDir, fileName);
-
-    // Write ZIP file to disk
-    writeFileSync(filePath, zipBuffer);
         console.log(`ZIP file saved to: ${filePath}`);
+        resolve();
+      });
+      zip.on('error', (error) => {
+        console.error('Archive error:', error);
+        reject(error);
+      });
+      output.on('error', (error) => {
+        console.error('Output stream error:', error);
+        reject(error);
+      });
+      zip.finalize();
+    });
 
     // Clean up old ZIP files in the background
     cleanupOldZips(downloadsDir).catch(error => {