added newsletter

1 files changed, 18 insertions, 0 deletions

diff --git a/app/lttr/validators.py b/app/lttr/validators.py
new file mode 100644
index 0000000..754df3b
--- /dev/null
+++ b/app/lttr/validators.py
@@ -0,0 +1,18 @@
+from django.contrib.auth import get_user_model
+from django.forms.utils import ValidationError
+from django.utils.translation import ugettext_lazy as _
+
+
+def validate_email_nouser(email):
+    """
+    Check if the email address does not belong to an existing user.
+    """
+    # Check whether we should be subscribed to as a user
+    User = get_user_model()
+
+    if User.objects.filter(email__exact=email).exists():
+        raise ValidationError(_(
+            "The e-mail address '%(email)s' belongs to a user with an "
+            "account on this site. Please log in as that user "
+            "and try again."
+        ) % {'email': email})