enterprise-mode-site-list-portal | project contains source code for the Enterprise | Portal library

Plenty of ways to figure out directory permissions here: How do you check for permissions to write to a directory or file?

As for the domain membership, use this: https://docs.microsoft.com/en-us/dotnet/api/system.environment.userdomainname?view=netframework-4.8

The UserDomainName property first attempts to get the domain name component of the Windows account name for the current user. If that attempt fails, this property attempts to get the domain name associated with the user name provided by the UserName property. If that attempt fails because the host computer is not joined to a domain, then the host computer name is returned.