Email document as attachment

I have setup a form and phpmailer function to send an email with the information regarding the current download page. Is there a way to grab the URL of the document page?

For example:
A user clicks on a form from the tree view and it loads the download page. From there I would like to show some information on the screen and provide a share function (This is what I wrote) so user’s can email the form out. If i can get the actual file URL, I can sanitize it for my script, just not sure how to get that.