Add basic moderation to forum

forum/migrations/0007_forummessagemeta.py

+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+import django.utils.timezone
+from django.conf import settings
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+        ('forum', '0006_auto_20170128_2243'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='ForumMessageMeta',
+            fields=[
+                ('id', models.AutoField(verbose_name='ID', serialize=False, primary_key=True, auto_created=True)),
+                ('date', models.DateTimeField(default=django.utils.timezone.now, verbose_name='date')),
+                ('action', models.CharField(max_length=16, choices=[('EDIT', 'Edit'), ('DELETE', 'Delete'), ('UNDELETE', 'Undelete')], verbose_name='action')),
+                ('message', models.ForeignKey(related_name='metas', to='forum.ForumMessage')),
+                ('user', models.ForeignKey(related_name='forum_message_metas', to=settings.AUTH_USER_MODEL)),
+            ],
+        ),
+    ]

forum/models.py

@@ -156,12 +156,33 @@ class ForumMessage(models.Model):
     def can_be_viewed_by(self, user):
         return user.can_view(self.topic)
 
+    def can_be_moderated_by(self, user):
+        return user.is_in_group(settings.SITH_GROUP_FORUM_ADMIN_ID)
+
     def get_absolute_url(self):
         return self.topic.get_absolute_url() + "#first_unread"
 
     def mark_as_read(self, user):
         self.readers.add(user)
 
+    def is_deleted(self):
+        meta = self.metas.exclude(action="EDIT").order_by('-date').first()
+        if meta:
+            return meta.action == "DELETE"
+        return False
+
+MESSAGE_META_ACTIONS = [
+        ('EDIT', _("Message edited by")),
+        ('DELETE', _("Message deleted by")),
+        ('UNDELETE', _("Message undeleted by")),
+        ]
+
+class ForumMessageMeta(models.Model):
+    user = models.ForeignKey(User, related_name="forum_message_metas")
+    message = models.ForeignKey(ForumMessage, related_name="metas")
+    date = models.DateTimeField(_('date'), default=timezone.now)
+    action = models.CharField(_("action"), choices=MESSAGE_META_ACTIONS, max_length=16)
+
 class ForumUserInfo(models.Model):
     user = models.OneToOneField(User, related_name="_forum_infos")
     last_read_date = models.DateTimeField(_('last read date'), default=datetime(year=settings.SITH_SCHOOL_START_YEAR,

forum/templates/forum/topic.jinja

@@ -67,6 +67,13 @@
                 {% if user.can_edit(m) %}
                 <span> <a href="{{ url('forum:edit_message', message_id=m.id) }}">{% trans %}Edit{% endtrans %}</a></span>
                 {% endif %}
+                {% if m.can_be_moderated_by(user) %}
+                {% if m.is_deleted() %}
+                <span> <a href="{{ url('forum:undelete_message', message_id=m.id) }}">{% trans %}Undelete{% endtrans %}</a></span>
+                {% else %}
+                <span> <a href="{{ url('forum:delete_message', message_id=m.id) }}">{% trans %}Delete{% endtrans %}</a></span>
+                {% endif %}
+                {% endif %}
                 <br/>
                 <span>{{ m.date|date(DATETIME_FORMAT) }} {{ m.date|time(DATETIME_FORMAT) }}</span>
             </div>
@@ -74,6 +81,13 @@
             <div>
             {{ m.message|markdown }}
             </div>
+            <ul>
+            {% for meta in m.metas.all() %}
+                <li>{{ meta.get_action_display() }} {{ meta.user.get_display_name() }}
+                    {% trans %} at {% endtrans %}{{ meta.date|time(DATETIME_FORMAT) }}
+                    {% trans %} the {% endtrans %}{{ meta.date|date(DATETIME_FORMAT)}}</li>
+            {% endfor %}
+            </ul>
         </div>
     </div>
     {{ m.mark_as_read(user) or "" }}

forum/urls.py

@@ -15,5 +15,7 @@ urlpatterns = [
     url(r'^topic/(?P<topic_id>[0-9]+)/edit$', ForumTopicEditView.as_view(), name='edit_topic'),
     url(r'^topic/(?P<topic_id>[0-9]+)/new_message$', ForumMessageCreateView.as_view(), name='new_message'),
     url(r'^message/(?P<message_id>[0-9]+)/edit$', ForumMessageEditView.as_view(), name='edit_message'),
+    url(r'^message/(?P<message_id>[0-9]+)/delete$', ForumMessageDeleteView.as_view(), name='delete_message'),
+    url(r'^message/(?P<message_id>[0-9]+)/undelete$', ForumMessageUndeleteView.as_view(), name='undelete_message'),
 ]
 

forum/views.py

 from django.shortcuts import render, get_object_or_404
 from django.views.generic import ListView, DetailView, RedirectView
 from django.views.generic.edit import UpdateView, CreateView, DeleteView
+from django.views.generic.detail import SingleObjectMixin
 from django.utils.translation import ugettext_lazy as _
 from django.core.urlresolvers import reverse, reverse_lazy
 from django.utils import timezone
@@ -10,7 +11,7 @@ from django.db import models
 from django.core.exceptions import PermissionDenied
 
 from core.views import CanViewMixin, CanEditMixin, CanEditPropMixin, CanCreateMixin, TabedViewMixin
-from forum.models import Forum, ForumMessage, ForumTopic
+from forum.models import Forum, ForumMessage, ForumTopic, ForumMessageMeta
 
 class ForumMainView(ListView):
     queryset = Forum.objects.filter(parent=None)
@@ -133,6 +134,30 @@ class ForumMessageEditView(CanEditMixin, UpdateView):
     template_name = "core/edit.jinja"
     pk_url_kwarg = "message_id"
 
+    def form_valid(self, form):
+        ForumMessageMeta(message=self.object, user=self.request.user, action="EDIT").save()
+        return super(ForumMessageEditView, self).form_valid(form)
+
+class ForumMessageDeleteView(SingleObjectMixin, RedirectView):
+    model = ForumMessage
+    pk_url_kwarg = "message_id"
+    permanent = False
+
+    def get_redirect_url(self, *args, **kwargs):
+        if self.object.can_be_moderated_by(self.request.user):
+            ForumMessageMeta(message=self.object, user=self.request.user, action="DELETE").save()
+        return self.object.get_absolute_url()
+
+class ForumMessageUndeleteView(SingleObjectMixin, RedirectView):
+    model = ForumMessage
+    pk_url_kwarg = "message_id"
+    permanent = False
+
+    def get_redirect_url(self, *args, **kwargs):
+        if self.object.can_be_moderated_by(self.request.user):
+            ForumMessageMeta(message=self.object, user=self.request.user, action="UNDELETE").save()
+        return self.object.get_absolute_url()
+
 class ForumMessageCreateView(CanCreateMixin, CreateView):
     model = ForumMessage
     fields = ['title', 'message']