Extracting WhereFroms Data to a File

I see a number of posts on how to delete the WhereFrom extended attributes data, but I would like to do the opposite and extract the information into a file.

I download Creative Commons photos from Flickr and provide photo credits on my blog.

I would like to set up a Folder Action that extracts the WhereFrom URL from the photo into a file, that way I can easily copy-paste the URL into my blog photo credit. It would also give me an archive of all my downloads.

I tried to reverse-engineer some of the delete scripts on StackExchange but didn't have any luck.