fix: csp rules for notification importers preview view

Preview was prevented by CSP control.

Author: nikomakela

notification_importers/admin.py

@@ -1,6 +1,7 @@
 import importlib
 import logging
 
+from csp.decorators import csp_update
 from django.conf import settings
 from django.contrib import admin, messages
 from django.http import HttpResponseRedirect
@@ -10,6 +11,8 @@
 from django_ilmoitin.admin import NotificationTemplateAdmin
 from django_ilmoitin.models import NotificationTemplate
 
+from palvelutarjotin.consts import CSP
+
 from .notification_importer import (
     AbstractNotificationImporter,
     NotificationImporterException,
@@ -107,6 +110,16 @@ def _send_error_message(self, request, message):
         logger.error(message)
         self.message_user(request, message, messages.ERROR)
 
+    # Acecpt CSP_UNSAFE_INLINE for the changeform view to allow
+    # the preview template to work correctly.
+    @csp_update(
+        SCRIPT_SRC=settings.CSP_SCRIPT_SRC + [CSP.UNSAFE_INLINE],
+    )
+    def changeform_view(self, request, object_id=None, form_url="", extra_context=None):
+        return super().changeform_view(
+            request, object_id, form_url, extra_context=extra_context
+        )
+
 
 if hasattr(settings, "NOTIFICATIONS_IMPORTER"):
     admin.site.unregister(NotificationTemplate)