# 382 - Redirect as 404

* extends 404 template (user should check the URL)
* introduces new decorator "uuid_required" which performs a check on a given 'uuid' or 'id' parameter
    * throws a Http404 exception --> redirect to 404 template instead of 500 error template

konova/decorators.py

@@ -7,9 +7,11 @@ Created on: 16.11.20
 """
 
 from functools import wraps
+from uuid import UUID
 
 from bootstrap_modal_forms.mixins import is_ajax
 from django.contrib import messages
+from django.http import Http404
 from django.shortcuts import redirect, get_object_or_404, render
 from django.urls import reverse
 from django.utils.translation import gettext_lazy as _
@@ -171,3 +173,20 @@ def login_required_modal(function):
             return render(request, template, context)
         return function(request, *args, **kwargs)
     return wrap
+
+
+def uuid_required(function):
+    """
+    Checks whether the given input is a valid UUID
+    """
+    @wraps(function)
+    def wrap(request, *args, **kwargs):
+        uuid = kwargs.get("uuid", None) or kwargs.get("id", None)
+        try:
+            uuid = UUID(uuid)
+        except ValueError:
+            raise Http404(
+                "Invalid UUID"
+            )
+        return function(request, *args, **kwargs)
+    return wrap