add website

app/util/redirect.py

@@ -0,0 +1,20 @@
+from urllib.parse import urlparse
+from flask import request
+
+
+def safe_redirect(fallback_url: str = "/", referrer_url: str = None) -> str:
+    if referrer_url is None:
+        referrer_url = request.referrer
+
+    if not referrer_url:
+        return fallback_url
+
+    try:
+        parsed_referrer = urlparse(referrer_url)
+
+        if parsed_referrer.netloc and parsed_referrer.netloc == request.host:
+            return referrer_url
+    except Exception:
+        pass
+
+    return fallback_url