Puppet users - Jul 2013 - accessing puppet:/// resources in custom providers

I''ve got a custom type which I have written which I have given a source
attribute that I want as a puppet:///<foo>/<my thing>. But I
can''t find
an example of how to get at that content from in there. Is it as obvious 
as something like

Net::HTTP.get("#{:server}/file_content/modules/<foo>/#{resource[:source]})

Or is this the part where I fall down the indirector rabbit hole?

-adam

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