use R to retrieve public link to dropbox file

I have several R functions that save files to drop box (mainly plots). This enables me to share them on the web as a web address. These functions will save the plots and automatically open them and the dropbox directory they're located in. I'm all about laziness/efficiency (depending on your perspective) and, unfortunately, when I finish I still have to right click the file I created and then Dropbox/copy public link. I would like to have R retrieve this public link, if possible (once I have that I'll be even lazier and have it write right to the clipboard).