feat(account): Add a template with a message when a CAS account is forbidden

src/dgsi/urls.py

@@ -7,4 +7,9 @@ app_name = "dgsi"
 urlpatterns = [
     path("accounts/profile/", views.ProfileView.as_view(), name="dgn-profile"),
     path("accounts/create/", views.CreateUserView.as_view(), name="dgn-create_user"),
+    path(
+        "accounts/forbidden/",
+        views.TemplateView.as_view(template_name="account/forbidden_category.html"),
+        name="dgn-forbidden_account",
+    ),
 ]

src/shared/account.py

@@ -2,6 +2,7 @@ from allauth.core.exceptions import ImmediateHttpResponse
 from allauth.socialaccount.adapter import DefaultSocialAccountAdapter
 from allauth.socialaccount.models import SocialLogin
 from django.http import HttpResponseRedirect
+from django.urls import reverse
 
 from dgsi.models import User
 
@@ -25,7 +26,9 @@ class SharedAccountAdapter(DefaultSocialAccountAdapter):
                     home[2]
                     in ["absint", "algo", "grecc", "guests", "spi", "spi1", "staffs"]
                 ):
-                    raise ImmediateHttpResponse(HttpResponseRedirect("/"))
+                    raise ImmediateHttpResponse(
+                        HttpResponseRedirect(reverse("dgsi:dgn-forbidden_account"))
+                    )
 
             case "kanidm":
                 username = sociallogin.account.extra_data["preferred_username"]

src/shared/templates/account/forbidden_category.html

@@ -0,0 +1,8 @@
+{% extends "base.html" %}
+{% load i18n %}
+
+{% block content %}
+  <div class="notification is-warning is-light px-5 py-5 has-text-centered is-size-5">
+    {% blocktrans %}Votre catégorie de compte ENS ne permet pas de vous identifier auprès de la DGNum.<br>Si vous pensez qu'il s'agit une erreur, merci de contacter la DGNum à l'adresse : <a href="mailto:contact@dgnum.eu">contact@dgnum.eu</a>{% endblocktrans  %}
+  </div>
+{% endblock content %}