Use sensible default for success and failure URIs

[pledbrook]

At the moment, if you don't specify successUri and failureUri settings for a provider, you just end up with an exception. THe plugin should really use a sensible default if those settings haven't been provided.

I originally thought successUri should be '/' by default, but then that leaves a big question mark over the default for the failure URI. Perhaps the defaults should be /oauth/success and /oauth/failure? Then the controller could provide default action implementations.

[antony]

I reckon this is not a bad idea. At least then you'd have a differentiator. Not sure what format the default action should take though - perhaps a simple page like the Grails error page?

[pledbrook]

I think a basic view that uses either the default application layout or 'main' would work. I think using 'main' layout is the best approach as not every project has a default application layout.