superusers don't see all extensions in the question editor

see #516

accounts/templates/profile/extensions.html

@@ -53,7 +53,10 @@
 </table>
 {% else %}
 {% if is_me %}
-<p><a class="btn btn-primary" href="{% url 'extension_new' %}"><span class="glyphicon glyphicon-upload"></span> Upload a new extension</a></p>
+<p>
+    <a class="btn btn-primary" href="{% url 'extension_new' %}"><span class="glyphicon glyphicon-plus"></span> Create a new extension</a>
+    <a class="btn btn-primary" href="{% url 'extension_new' %}"><span class="glyphicon glyphicon-upload"></span> Upload a new extension</a>
+</p>
 {% else %}
 <p class="nothing-here">{{view_user.first_name}} hasn't uploaded any extensions yet.</p>
 {% endif %}

editor/models.py

@@ -57,6 +57,8 @@
 @deconstructible
 class ControlledObject(object):
 
+    superuser_sees_everything = True
+
     @property
     def owner(self):
         raise NotImplementedError
@@ -74,7 +76,7 @@ def can_be_viewed_by(self, user):
                 return True
         except AttributeError:
             pass
-        return (user.is_superuser) or (self.owner == user) or (self.has_access(user, accept_levels))
+        return (self.superuser_sees_everything and user.is_superuser) or (self.owner == user) or (self.has_access(user, accept_levels))
 
     def can_be_copied_by(self, user):
         if not self.can_be_viewed_by(user):
@@ -107,7 +109,7 @@ def filter_can_be_viewed_by(cls, user):
             return Q()
 
         view_perms = ('edit', 'view')
-        if user.is_superuser:
+        if user.is_superuser and self.superuser_sees_everything:
             return Q()
         elif user.is_anonymous:
             return Q(published=True, public_access__in=view_perms)
@@ -361,6 +363,8 @@ class Extension(models.Model, ControlledObject):
     editable = models.BooleanField(default=True, help_text='Is this extension stored within the editor\'s media folder?')
     runs_headless = models.BooleanField(default=True, help_text='Can this extension run outside a browser?')
 
+    superuser_sees_everything = False
+
     class Meta:
         ordering = ['name']
     def __str__(self):
@@ -393,7 +397,7 @@ def filter_can_be_viewed_by(cls, user):
             return Q()
 
         view_perms = ('edit', 'view')
-        if user.is_superuser:
+        if self.superuser_sees_everything and user.is_superuser:
             return Q()
         elif user.is_anonymous:
             return Q(public=True)