core Fix case sensitivity for app passwords/tokens

Description

Fix case sensitivity for app passwords/tokens

Related Issue

https://github.com/owncloud/core/issues/40119
https://github.com/owncloud/core/issues/29708

Motivation and Context

Currently, app passwords/tokens are case sensitive. That is, login will be prevented if the entered username has different case as the app password/token's username (which comes from the user's session).

How Has This Been Tested?

Login as user User1 and create an app password/token --> username will be automatically set to User1 and saved as the login_name in the oc_authtoken table.
Try to authenticate by using i.e. the ownCloud desktop client with the newly generated app password/token by using user1 as username (note the different casing):

Before this fix --> login failed with exception https://github.com/owncloud/core/blob/master/lib/private/User/Session.php#L927

After this fix --> login is correctly allowed, which is consistent with the "normal" login via username/password where usernames are case-insensitive.

Types of changes

[x] Bug fix (non-breaking change which fixes an issue)
[ ] New feature (non-breaking change which adds functionality)
[ ] Database schema changes (next release will require increase of minor version instead of patch)
[ ] Breaking change (fix or feature that would cause existing functionality to change)
[ ] Technical debt
[ ] Tests only (no source changes)

Checklist:

[x] Code changes
[ ] Unit tests added
[ ] Acceptance tests added
[ ] Documentation ticket raised

Aug 10 '22 13:08 pako81

Thanks for opening this pull request! The maintainers of this repository would appreciate it if you would create a changelog item based on your changes.