[Bug]: OpenID username case-sensitive

[stich86]

⚠️ This issue respects the following points: ⚠️

• This is a bug, not a question or a configuration issue.
• This issue is not already reported on Github (I've searched it).

Bug description

Hello,

i've configured my SFTPGo to do authentication using OIDC with Microsoft Entra ID, and using email as "username".
My tenant is a nightmare, because lot of people have username and emails with some letters or the a part in upper case, so if I configure the email as username into SFTPGo in lowercase, this will not work because it doesn't match the claim recevived from Entra.

Is it possible to make this case insensitive?

I currently cannot replace all emails in my tenant, until I understand what can this change break..

Thanks

Steps to reproduce

Just configure an user with upper case email on Entra, and lower case on SFTPGo, after authentication it will give error because it doesn't find the matched user on the SFTPGo DB

Expected behavior

Login without check username case

SFTPGo version

v2.6.4

Data provider

N/A

Installation method

Community Deb package

Configuration

config

Relevant log output

What are you using SFTPGo for?

Medium business

Additional info

No response