dashboard: Temporary user quota

Closes #44

circle/dashboard/models.py

@@ -2,14 +2,16 @@ from logging import getLogger
 
 from django.conf import settings
 from django.contrib.auth.models import User
-from django.db.models import Model, ForeignKey, OneToOneField, CharField
+from django.db.models import (
+    Model, ForeignKey, OneToOneField, CharField, IntegerField
+)
 from django.utils.translation import ugettext_lazy as _
 
 from vm.models import Instance
 
-
 logger = getLogger(__name__)
 
+
 class Favourite(Model):
     instance = ForeignKey(Instance)
     user = ForeignKey(User)
@@ -24,6 +26,7 @@ class Profile(Model):
     org_id = CharField(  # may be populated from eduPersonOrgId field
         unique=True, blank=True, null=True, max_length=64,
         help_text=_('Unique identifier of the person, e.g. a student number.'))
+    instance_limit = IntegerField(default=5)
 
 
 if hasattr(settings, 'SAML_ORG_ID_ATTRIBUTE'):
@@ -51,7 +54,6 @@ if hasattr(settings, 'SAML_ORG_ID_ATTRIBUTE'):
                          value, sender.username)
         return False
 
-
     pre_user_save.connect(save_org_id, weak=False)
 else:
     logger.debug("Do not register save_org_id to djangosaml2 pre_user_save")

circle/dashboard/views.py

@@ -683,7 +683,6 @@ class VmCreate(LoginRequiredMixin, TemplateView):
         })
         return self.render_to_response(context)
 
-    # TODO handle not ajax posts
     def post(self, request, *args, **kwargs):
         form = self.form_class(request.POST)
         if not form.is_valid():
@@ -691,6 +690,22 @@ class VmCreate(LoginRequiredMixin, TemplateView):
         post = form.cleaned_data
         user = request.user
 
+        try:
+            limit = user.profile.instance_limit
+        except Exception as e:
+            logger.debug('No profile or instance limit: %s', e)
+        else:
+            current = Instance.active.filter(owner=user).count()
+            logger.debug('current use: %d, limit: %d', current, limit)
+            if limit < current:
+                messages.error(request,
+                               _('Instance limit (%d) exceeded.') % limit)
+                if request.is_ajax():
+                    return HttpResponse(json.dumps({'redirect': '/'}),
+                                        content_type="application/json")
+                else:
+                    return redirect('/')
+
         template = post['template']
         if not template.has_level(request.user, 'user'):
             raise PermissionDenied()