feat(account): Use a custom adpater

src/app/settings.py

@@ -111,11 +111,6 @@ AUTHENTICATION_BACKENDS = [
     "allauth.account.auth_backends.AuthenticationBackend",
 ]
 
-ACCOUNT_ADAPTER = "shared.account.AccountAdapter"
-ACCOUNT_CHANGE_EMAIL = True
-ACCOUNT_EMAIL_NOTIFICATIONS = True
-
-SOCIALACCOUNT_ONLY = True
 SOCIALACCOUNT_PROVIDERS = {
     "openid_connect": {
         "OAUTH_PKCE_ENABLED": True,
@@ -127,12 +122,25 @@ SOCIALACCOUNT_PROVIDERS = {
                 "secret": credentials["KANIDM_SECRET"],
                 "settings": {
                     "server_url": f"https://sso.dgnum.eu/oauth2/openid/{credentials['KANIDM_CLIENT']}",
+                    "color": "primary",
                 },
             }
         ],
     },
+    "cas": {
+        "APP": {
+            "provider_id": "ens_cas",
+            "name": "CAS ENS",
+            "settings": {"color": "danger"},
+        },
+    },
 }
 
+SOCIALACCOUNT_ONLY = True
+SOCIALACCOUNT_ADAPTER = "shared.account.SharedAccountAdapter"
+ACCOUNT_EMAIL_VERIFICATION = "none"
+ACCOUNT_AUTHENTICATION_METHOD = "username"
+
 AUTH_PASSWORD_VALIDATORS = []
 AUTH_USER_MODEL = "dgsi.User"
 
@@ -206,6 +214,8 @@ if DEBUG:
         "django_browser_reload.middleware.BrowserReloadMiddleware",
     ]
 
+    EMAIL_BACKEND = "django.core.mail.backends.console.EmailBackend"
+
     INTERNAL_IPS = ["127.0.0.1"]
 
     DEBUG_TOOLBAR_CONFIG = {"INSERT_BEFORE": "</footer>"}

src/shared/account.py

@@ -1,10 +1,35 @@
-from allauth.account.adapter import DefaultAccountAdapter
+from allauth.socialaccount.adapter import DefaultSocialAccountAdapter
+from allauth.socialaccount.models import SocialLogin
+
+from dgsi.models import User
 
 
-class AccountAdapter(DefaultAccountAdapter):
+class SharedAccountAdapter(DefaultSocialAccountAdapter):
     """
-    Overrides the Account Adapter.
+    Overrides the Account Adapter, to allow a simpler connection via CAS.
     """
 
-    def is_open_for_signup(self, request):
-        return False
+    def pre_social_login(self, request, sociallogin):
+        match sociallogin.account.provider:
+            # TODO: Add a correspondance table between ENS logins and ours
+            case "ens_cas":
+                # In this case, the username is located in extra_data["uid"]
+                username = sociallogin.account.extra_data["uid"]
+            case "kanidm":
+                username = sociallogin.account.extra_data["preferred_username"]
+            case _p:
+                raise KeyError(f"No sociallogin '{_p}' is supposed to exist.")
+
+        try:
+            # Connect an existing user if the login already exists, even if it
+            # with another social method
+            user = User.objects.get(username=username)
+            sociallogin.connect(request, user)
+        except User.DoesNotExist:
+            pass
+
+    def populate_user(self, request, sociallogin, data):
+        return super().populate_user(request, sociallogin, data)
+
+    def save_user(self, request, sociallogin: SocialLogin, form=None):
+        return super().save_user(request, sociallogin, form)