Login required on modals

* adds new login_required_modal decorator
    * can be used before regular login_required decorator to return a proper session-timed-out message

konova/decorators.py

@@ -8,12 +8,12 @@ Created on: 16.11.20
 
 from functools import wraps
 
+from bootstrap_modal_forms.utils import is_ajax
 from django.contrib import messages
-from django.shortcuts import redirect, get_object_or_404
+from django.shortcuts import redirect, get_object_or_404, render
 from django.urls import reverse
 from django.utils.translation import gettext_lazy as _
 
-from konova.settings import DEFAULT_GROUP, ETS_GROUP, ZB_GROUP
 from konova.utils.message_templates import MISSING_GROUP_PERMISSION, DATA_UNSHARED
 
 
@@ -146,4 +146,28 @@ def shared_access_required(obj_class, id_key):
                     return redirect("home")
             return function(request, *args, **kwargs)
         return wrap
-    return decorator
+    return decorator
+
+
+def login_required_modal(function):
+    """ Checks on modal requests whether the user is authenticated or not
+
+    If not, the user will not be redirected but informed about the need to relogin.
+
+    """
+    @wraps(function)
+    def wrap(request, *args, **kwargs):
+        is_modal_request = is_ajax(request.META)
+        is_user_not_logged_in = not request.user.is_authenticated
+
+        if is_modal_request and is_user_not_logged_in:
+            template = "modal/modal_generic.html"
+            body_template = "modal/modal_session_timed_out.html"
+
+            context = {
+                "modal_body_template": body_template,
+                "modal_title": _("Session timed out"),
+            }
+            return render(request, template, context)
+        return function(request, *args, **kwargs)
+    return wrap