[DSL] Better support for authentication outside of URL

[ysb33r]

The easiest way to perform suer auth is to encode the username & password in the URL. This is obvisouly not the best way for a nuber of reasons.

Currently in Apache VFS the way of creating a user authentication object is

StaticUserAuthenticator auth = new StaticUserAuthenticator("domain", "username", "password");
FileSystemOptions opts = new FileSystemOptions(); 
DefaultFileSystemConfigBuilder.getInstance().setUserAuthenticator(opts, auth); 
FileObject fo = VFS.getManager().resolveFile("smb://host/anyshare/dir", opts);

Need a Groovy way of adding this to a fie system or a per-request execution.

Maybe something like

// In an options block 
options {
  ftp {
    auth {
      username : 'USERNAME'
      password : 'PASSWORD'
    }
 }
}

// As an auth object
def credentials = auth ( username : 'USERNAME', password : 'PASSWORD', domain :  'DOMAIN' )

// Using an auth object in a statement
// (But does the auth object apply to src or dest url?
cp 'ftp://from.server/a.file', 'file:///home/ysb33r/b.file', auth : credentials