auth
auth/token_test.go
Start supporting our pluggable grant_type. Define GrantType as a way to bundle information that can be used to validate requests based on their grant_type parameter. Move our validation of the authorization_code grant_type out of GetTokenHandler and into its own function. Define RegisterGrantType as a way to register new grant_type bundles and associate them with the string passed to grant_type. This enables other packages to define RegisterGrantType in their init() functions and plug in new grant types without forking this code. Implement RegisterGrantType for our authorization_code grant type.