alternative user name

Author: pcrespov

packages/postgres-database/src/simcore_postgres_database/utils_users.py

@@ -36,6 +36,10 @@ def _generate_random_chars(length=5) -> str:
     return "".join(secrets.choice(string.digits) for _ in range(length - 1))
 
 
+def generate_alternative_username(username) -> str:
+    return f"{username}_{_generate_random_chars()}"
+
+
 class UsersRepo:
     @staticmethod
     async def new_user(
@@ -61,7 +65,7 @@ async def new_user(
                     users.insert().values(**data).returning(users.c.id)
                 )
             except UniqueViolation:  # noqa: PERF203
-                data["name"] = f'{data["name"]}_{_generate_random_chars()}'
+                data["name"] = generate_alternative_username(data["name"])
 
         result = await conn.execute(
             sa.select(

services/web/server/src/simcore_service_webserver/users/api.py

@@ -28,6 +28,7 @@
 from simcore_postgres_database.utils_groups_extra_properties import (
     GroupExtraPropertiesNotFoundError,
 )
+from simcore_postgres_database.utils_users import generate_alternative_username
 
 from ..db.plugin import get_database_engine
 from ..groups.models import convert_groups_db_to_schema
@@ -180,8 +181,13 @@ async def update_user_profile(
                 assert resp.rowcount == 1  # nosec
 
             except db_errors.UniqueViolation as err:
+                user_name = updated_values.get("name")
+
                 raise UserNameDuplicateError(
-                    user_name=updated_values.get("name")
+                    user_name=user_name,
+                    alternative_user_name=generate_alternative_username(user_name),
+                    user_id=user_id,
+                    updated_values=updated_values,
                 ) from err
 
 

services/web/server/src/simcore_service_webserver/users/exceptions.py

@@ -22,7 +22,10 @@ def __init__(self, *, uid: int | None = None, email: str | None = None, **ctx: A
 
 
 class UserNameDuplicateError(UsersBaseError):
-    msg_template = "Username {user_name} is already in use. Violates unique constraint"
+    msg_template = (
+        "The username '{user_name}' is already taken. "
+        "Consider using '{alternative_user_name}' instead."
+    )
 
 
 class TokenNotFoundError(UsersBaseError):