Use cas server to use authentication in other services

Signed-off-by: Yohann D'ANELLO <ynerant@crans.org>

apps/member/auth.py

@@ -0,0 +1,15 @@
+from cas_server.auth import DjangoAuthUser  # pragma: no cover
+
+from note.models import Alias
+
+
+class CustomAuthUser(DjangoAuthUser):  # pragma: no cover
+    """
+    Override Django Auth User model to define a custom Matrix username.
+    """
+
+    def attributs(self):
+        d = super().attributs()
+        if self.user:
+            d["normalized_name"] = Alias.normalize(self.user.username)
+        return d