- Add a new storer specifically for OAuth2 to enable clients to choose
regular database storing OR Oauth2 but not have to have both.
- Stop storing OAuth2 credentials in a combined form inside username.
- Add new events to capture OAuth events just like auth.
- Have pass-through parameters for OAuth init urls, this allows us to
pass additional behavior options (redirects and remember me) as well
as other things that should be present on the page that is redirected
to.
- Context.LoadUser is now OAuth aware.
- Remember's callbacks now include an OAuth check to see if a horribly
packed state variable contains a flag to say that we want to be
remembered.
- Change the OAuth2 Callback to use Attributes instead of that custom
struct to allow people to append whatever attributes they want into
the user that will be saved.
- Add error handling at the routing level so that all errors can bubble
up and be handled and logged there in one place.
- Add Err variants for ClientStorer and Attributes to facilitate
generating errors for missing type-failing arguments.
- Add better control flow and error handling for callbacks.
- Export ModuleAttrMeta so the modules can access it.
- Add a couple new events for later use.
- Fix a few compile errors.
- Prefix err constants with Err.
