Hi.

In our application all presenters inherit from a base class to enable passing of some @persistent attributes. Unfortunately, as I understand it, nette does not allow passing them between classes without common parent.

This means we get into a kind of impossible situation because:

• while we can extend the OAuth2Presenter from this package it doesn't help because it does not inherit from our base presenter and therefore it will not get the persistent attribute
• we can not make it extend from our base presenter because, well, we don't control the code
• we can copy-paste all your code into our own class and make it inherit from the base presenter, but I think we will all agree that is incredibly stupid.

The change here would involve pulling all the code from the presenter to a trait. By default the presenter provided by this package would just use the trait and everything will stay exactly the same for the outside users.

But in addition it would enable us to make our own class, inherit our own base presenter but use the shared code from this package as an implementation.

We should probably extract an interface from the OAuth2Presenter just to be sure it preserves the contract.

What do you think? I can make a pull request if this seems like a not-completely-terrible idea.

(NB. Please also understand the application I work on is several years old and the architecture is not the best possible. We know that. It is also impossible to change. Please don't tell us we are doing it wrong :D)