Request invite flow

bookwyrm/forms.py

@@ -3,6 +3,7 @@ import datetime
 from collections import defaultdict
 
 from django import forms
+from django.core.exceptions import ValidationError
 from django.forms import ModelForm, PasswordInput, widgets
 from django.forms.widgets import Textarea
 from django.utils import timezone
@@ -203,6 +204,13 @@ class ExpiryWidget(widgets.Select):
 
 
 class InviteRequestForm(CustomForm):
+    def clean(self):
+        """ make sure the email isn't in use by a registered user """
+        cleaned_data = super().clean()
+        email = cleaned_data.get("email")
+        if email and models.User.objects.filter(email=email).exists():
+            self.add_error("email", _("A user with this email already exists."))
+
     class Meta:
         model = models.InviteRequest
         fields = ["email"]