Check email address domain when signing up

photo21/forms.py

@@ -0,0 +1,25 @@
+from django import forms
+from django.utils.translation import gettext_lazy as _
+from allauth.account.forms import SignupForm
+
+
+class CustomSignupForm(SignupForm):
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+
+        # Add description on email field
+        self.fields["email"].help_text = _(
+            "Please enter a valid email address ending with `@crans.org` or "
+            "`@ens-paris-saclay.fr`."
+        )
+
+    def clean_email(self):
+        """
+        Check that the email address ends with a trusted domain.
+        """
+        email = self.cleaned_data.get("email")
+        if not email.endswith("@crans.org") and not email.endswith("@ens-paris-saclay.fr"):
+            raise forms.ValidationError(
+                _("Must end with `@crans.org` or `@ens-paris-saclay.fr`.")
+            )
+        return email