one: share quota checked on template editing

one/models.py

@@ -387,6 +387,27 @@ class Template(models.Model):
     def get_credits_per_instance(self):
         return self.instance_type.credit
 
+    def get_shares_for(self, user=None):
+        shares = Share.objects.all().filter(template=self)
+        if user:
+            return shares.filter(owner=user)
+        else:
+            return shares
+
+    def get_share_quota_usage_for(self, user=None):
+        shares = self.get_shares_for(user)
+        usage = 0
+        for share in shares:
+            usage += share.instance_limit * self.get_credits_per_instance()
+        return usage
+
+    def get_share_quota_usage_for_user_with_type(self, type, user=None):
+        shares = self.get_shares_for(user)
+        usage = 0
+        for share in shares:
+            usage += share.instance_limit * type.credit
+        return usage
+
 class Instance(models.Model):
     """Virtual machine instance."""
     name = models.CharField(max_length=100,

one/views.py

@@ -147,9 +147,19 @@ class AjaxTemplateEditWizard(View):
             }))
     def post(self, request, id, *args, **kwargs):
         template = get_object_or_404(Template, id=id)
+        user_details = UserCloudDetails.objects.get(user=request.user)
         if template.owner != request.user and not template.public and not request.user.is_superuser:
             raise PermissionDenied()
-        template.instance_type_id = request.POST['size']
+        instance_type = get_object_or_404(InstanceType, id=request.POST['size'])
+        current_used_share_quota = user_details.get_weighted_share_count()
+        current_used_share_quota_without_template = current_used_share_quota - template.get_share_quota_usage_for(request.user)
+        new_quota_for_current_template = template.get_share_quota_usage_for_user_with_type(instance_type, request.user)
+        new_used_share_quota = current_used_share_quota_without_template + new_quota_for_current_template
+        allow_type_modify = True if new_used_share_quota <= user_details.share_quota else False
+        if not allow_type_modify:
+            messages.error(request, _('You do not have enough free share quota.'))
+            return redirect(home)
+        template.instance_type = instance_type
         template.description = request.POST['description']
         template.name = request.POST['name']
         template.save()