still about the file backup

Flask/app.py

@@ -412,8 +412,28 @@ def download(filename):
     print("file send !")
     return send_from_directory(directory='/app/MsRewards-Reborn/user_data/', path=filename, as_attachment=True)
 
+ALLOWED_EXTENSIONS = [".json"]
+def allowed_file(filename):
+    return '.' in filename and \
+           filename.rsplit('.', 1)[1].lower() in ALLOWED_EXTENSIONS
 
-
+@app.route('/upload_file/', methods=['POST'])
+@login_required
+def upload_file():
+    # check if the post request has the file part
+    if 'file' not in request.files:
+        print('No file part')
+        return redirect(request.url)
+    file = request.files['file']
+    # If the user does not select a file, the browser submits an
+    # empty file without a filename.
+    if file.filename == '':
+        print('No selected file')
+        return redirect(request.url)
+    if file and allowed_file(file.filename):
+        filename = secure_filename(file.filename)
+        file.save(os.path.join('/app/MsRewards-Reborn/user_data/', filename))
+        return redirect(url_for('download_file', name=filename))
 
 def maxi(dict):
     m = 0