version 0.0
Require Yale credentials to access a url.
http://www.yale.edu/tp/auth/usingcasatyale.html
http://jasig.github.io/cas/development/protocol/CAS-Protocol-Specification.html
- Prevent multiple POSTs to the same url by same user.
- Prevent SPAM. (Require Net Id to shorten?)
- Make sure url is valid? CHeck bit.ly behavior.