euth/offlinephases: add permission required mixin to offlineevent det…

…ail view

euth/offlinephases/rules.py

@@ -1,8 +1,17 @@
 import rules
 from rules.predicates import is_superuser
 
+from adhocracy4.modules.predicates import (is_context_initiator,
+                                           is_context_member,
+                                           is_context_moderator,
+                                           is_public_context)
+
 from .predicates import is_offlinephase_moderator
 
 rules.add_perm(
     'euth_offlinephases.modify_offlinephase',
     is_offlinephase_moderator | is_superuser)
+
+rules.add_perm('euth_offlinephases.view_offlineevent',
+               is_superuser | is_context_moderator | is_context_initiator |
+               is_context_member | is_public_context)

euth/offlinephases/views.py

@@ -4,6 +4,7 @@
 from django.urls import reverse
 from django.utils.translation import ugettext_lazy as _
 from django.views import generic
+from rules.contrib.views import PermissionRequiredMixin
 
 from adhocracy4.dashboard import mixins
 from adhocracy4.projects.mixins import ProjectMixin
@@ -12,10 +13,10 @@
 from .mixins import OfflineEventFormMixin
 
 
-class OfflineEventDetailView(
-    generic.DetailView
-):
+class OfflineEventDetailView(PermissionRequiredMixin,
+                             generic.DetailView):
     model = models.OfflineEvent
+    permission_required = 'euth_offlinephases.view_offlineevent'
 
     @property
     def project(self):