uranusjr commented on a change in pull request #18757:
URL: https://github.com/apache/airflow/pull/18757#discussion_r723183980



##########
File path: airflow/api_connexion/endpoints/user_endpoint.py
##########
@@ -124,9 +124,21 @@ def patch_user(username, update_mask=None):
     if user is None:
         detail = f"The User with username `{username}` was not found"
         raise NotFound(title="User not found", detail=detail)
-
-    # Get fields to update. 'username' is always excluded (and it's an error to
-    # include it in update_maek).
+    # Check unique username
+    new_username = data.get('username')
+    if new_username:
+        usr = security_manager.find_user(username=new_username)
+        if usr and usr != user:
+            raise AlreadyExists(detail=f"The username `{new_username}` already 
exists")
+
+    # Check unique email
+    email = data.get('email')
+    if email:
+        usr = security_manager.find_user(email=email)
+        if usr and usr != user:
+            raise AlreadyExists(detail=f"The email `{email}` already exists")

Review comment:
       Hmm, that's not what the JSON Schema specification says (OpenAPI takes 
both `required` and `minLength` directly from it), so this is more likely a bug 
in the implementation. In that case, maybe we should leave both fields out from 
the specification, but mention that both must be non-empty if supplied, and 
validate them manually instead.




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