added download only mode that simply downloads files to the client when the server finishes the download

added dependency on savefile library for download-only mode

backend/app.js

@@ -255,9 +255,7 @@ app.post('/fileStatusMp4', function(req, res) {
     var fullpath = videoPath + name + ".mp4";
     if (fs.existsSync(fullpath)) {
     	exists = [basePath + videoPath + name, getFileSizeMp4(name)];
-    }
-    else
-    {
+    } else {
         var percent = 0;
         var size = getFileSizeMp4(name);
         var downloaded = getAmountDownloadedMp4(name);
@@ -386,6 +384,19 @@ app.post('/deleteMp4', function(req, res) {
     }
 });
 
+app.post('/downloadFile', function(req, res) {
+    let fileName = req.body.fileName;
+    let type = req.body.type;
+    let file = null;
+    if (type === 'audio') {
+        file = __dirname + '/' + 'audio/' + fileName + '.mp3';
+    } else if (type === 'video') {
+        file = __dirname + '/' + 'video/' + fileName + '.mp4';
+    }
+
+    res.sendFile(file);
+});
+
 
 app.get('/video/:id', function(req , res){
     var head;

backend/config/default.json

@@ -16,7 +16,8 @@
       },
       "Extra": {
         "title_top": "Youtube Downloader",
-		"file_manager_enabled": true
+        "download_only_mode": false,
+		    "file_manager_enabled": true
       }
     }
   }