Server-Side Validation for “Save As” Actions in Mobile Client Web View

[alperozturk96]

When a user tries to create a spreadsheet or document and presses “Save As” from the mobile client, which uses a web view, the server should perform the validation for file name

Demo

https://github.com/user-attachments/assets/616ad9b5-a8c0-4366-8bc6-65e9da003639

[susnux]

I think this is part of Nextcloud office, so cc @juliushaertl

Context: If you try to create a file you always should validate the filename. You can do this easily with: https://nextcloud-libraries.github.io/nextcloud-files/functions/validateFilename.html

[susnux]

(Please move this issue to the correct repository (richdocuments ?))