Add download bucket as zip archive

lib/endpoints.js

@@ -11,7 +11,9 @@ const fs = require("fs");
 const tusMeta = require('tus-metadata');
 const assert = require('assert');
 const AES = require("crypto-js/aes");
+const MD5 = require("crypto-js/md5");
 const debug = require('debug')('psitransfer:main');
+const archiver = require('archiver');
 
 const errorPage = fs.readFileSync(path.join(__dirname, '../public/html/error.html')).toString();
 const store = new Store(config.uploadDir);
@@ -73,6 +75,50 @@ app.get('/files/:fid', async(req, res, next) => {
   // let tusboy handle HEAD with Tus Header
   if(req.method === 'HEAD' && req.get('Tus-Resumable')) return next();
 
+  // Download all files
+  if(req.params.fid.endsWith('.zip')) {
+    const sid = req.params.fid.split('++')[0];
+    const bucket = db.get(sid);
+    if(req.params.fid !== sid + '++' + MD5(bucket.map(f => f.key).join()).toString() + '.zip') {
+      res.status(404).send(errorPage.replace('%%ERROR%%', 'Invalid link'));
+      return;
+    }
+    debug(`Download Bucket ${sid}`);
+
+    res.header('ContentType', 'application/zip');
+    res.header('Content-Disposition', 'attachment; filename="' + sid + '.zip"');
+
+    const archive = archiver('zip');
+    archive.on('error', function(err) {
+      console.error(err);
+    });
+
+    bucket.forEach(info => {
+      archive.append(
+        fs.createReadStream(store.getFilename(info.metadata.sid + '++' + info.key)),
+        {name: info.metadata.name}
+      );
+    });
+
+    archive.pipe(res);
+    archive.finalize();
+
+    try {
+      res.on('finish', async () => {
+        bucket.forEach(async info => {
+          if(info.metadata.retention === 'one-time') {
+            await db.remove(info.metadata.sid, info.metadata.key);
+          }
+        });
+      });
+    } catch(e) {
+      console.error(e);
+    }
+
+    return;
+  }
+
+  // Download single file
   debug(`Download ${req.params.fid}`);
   try {
     const info = await store.info(req.params.fid); // throws on 404