aurweb.auth: add user credentials and matcher functions

This clones the behavior already present in the PHP implementation,
but it uses a global dict with credential constant keys to
validation functions to determine if a given user has a credential.

Signed-off-by: Kevin Morris <kevr@0cost.org>

aurweb/models/user.py

@@ -141,6 +141,11 @@ class User:
         request.cookies["AURSID"] = self.session.SessionID
         return self.session.SessionID
 
+    def has_credential(self, credential: str, approved: list = tuple()):
+        import aurweb.auth
+        cred = getattr(aurweb.auth, credential)
+        return aurweb.auth.has_credential(self, cred, approved)
+
     def logout(self, request):
         from aurweb.db import session