[Bug]: File Provider domain identifiers cannot be created containing slashes or colons

[claucambra]

⚠️ Before submitting, please verify the following: ⚠️

• This is a bug, not a question or a configuration issue.
• This issue is not already reported on Github (I've searched it).
• Nextcloud Server and Desktop Client are up to date. See Server Maintenance and Release Schedule and Desktop Releases for supported versions.
• I agree to follow Nextcloud's Code of Conduct

Bug description

This is an issue since we use userIdAtHost which can contain a port number suffixed to a server url, e.g. "user@c.nc.com:6969"

Steps to reproduce

Start the client

Expected behavior

Use legal file provider domain identifiers

Which files are affected by this bug

N/A

Operating system

Mac OS

Which version of the operating system you are running.

macOS 14.4

Package

Other

Nextcloud Server version

28

Nextcloud Desktop Client version

3.13.0-fileprovider-rc1

Is this bug present after an update or on a fresh install?

Fresh desktop client install

Are you using the Nextcloud Server Encryption module?

Encryption is Disabled

Are you using an external user-backend?

• Default internal user-backend
• LDAP/ Active Directory
• SSO - SAML
• Other

Nextcloud Server logs

No response

Additional info

No response