oauth2

NewClient returns a client that has two helper functions, one is an AuthHandler with needs to be installed at the same address as redirect, the other is a Shim that checks for valid credentials and rejects the unauthorized users.

BSUEmail is a valid regexp for any BSU address.

Client supplies the ability to authenticate via OAuth2 on Google, but more specifically for BSU people through Google.

Config holds the information necessary to create a new client.