[WIP] Evented implementation for Zend Auth

[weierophinney]

I've been playing around with making the core of Zend Auth event based, this is very much a WIP but the idea is to support the use cases in the cookbook directory.

Feedback would be appreciated; if it is agreed that this is the right direction to go, I can finish off the code: add tests, docs and migrate the existing adapters to listeners.

---

Originally posted by @carnage at zendframework/zend-authentication#7

[weierophinney]

After talking with @akrabat at PHPUK I've updated this adding back in some backward compatibility.

The remaining BC breaks are:

authenticate method used to take an adapter; this doesn't quite make sense via the new event based internals and instead needs to take parameters to authenticate against.

I've removed the get/set adapter methods and replaced with an addAdapter method (get/set makes no sense with multiple adapter setup)

It should be noted however that the service still complies with it's interface.

---

Originally posted by @carnage at zendframework/zend-authentication#7 (comment)

[weierophinney]

@carnage If you're still interested in this approach (and it does look interesting!), please rebase against current develop and re-target the PR against that branch so we can review.

Thanks!

---

Originally posted by @weierophinney at zendframework/zend-authentication#7 (comment)

[weierophinney]

I'd totally forgotten about this PR

Will try and get some time to bring it up to spec in the next few weeks

---

Originally posted by @carnage at zendframework/zend-authentication#7 (comment)

[weierophinney]

@weierophinney how keen are you to preserve BC here? Zend auth has basically remained the same since ZF1 and could really use a bit of refactoring (eg adaptors which require you to set them up in advance as opposed to authenticating against given paramters)

---

Originally posted by @carnage at zendframework/zend-authentication#7 (comment)