Inherit from Dovecot auth plugin.

Author: tonioo

radicale_modoboa_auth_oauth2/__init__.py

@@ -2,11 +2,23 @@
 
 import requests
 
-from radicale import auth
+from radicale.auth.dovecot import Auth as DovecotAuth
 from radicale.log import logger
 
 
-class Auth(auth.BaseAuth):
+class Auth(DovecotAuth):
+    """
+    Custom authentication plugin using oAuth2 introspection mode.
+
+    If the authentication fails with given credentials, it falls back to Dovecot
+    authentication.
+
+    Configuration:
+
+    [auth]
+    type = radicale_modoboa_auth_oauth2
+    oauth2_introspection_endpoint = <URL HERE>
+    """
 
     def __init__(self, configuration):
         super().__init__(configuration)
@@ -25,4 +37,4 @@ def _login(self, login, password):
         content = response.json()
         if response.status_code == 200 and content.get("active") and content.get("username") == login:
             return login
-        return ""
+        return super()._login(login, password)