Support basic auth in user context subscriber

[dbu]

The user context subscriber added in #145 should support basic authentication header instead or in addition to the session cookie.

The default behaviour should be to look at both authorization header and cookies, just as we propose with varnish. we could add an option to select one of the two exclusively and then ignore the other if the option is set.

[sprain]

I would like to contribute to this (as we have a need for it) but have a basic and probably stupid question: Where is the method generating the actual response content in https://github.com/FriendsOfSymfony/FOSHttpCache/blob/master/src/SymfonyCache/UserContextSubscriber.php#L167?

[hpatoio]

The library calls the URI specified in user_hash_uri and there you generate the response content. See http://foshttpcache.readthedocs.org/en/latest/user-context.html#returning-the-user-context-hash

Am I right @dbu ?

[ddeboer]

That's exactly right, @hpatoio. See also http://foshttpcache.readthedocs.org/en/latest/symfony-cache-configuration.html.

[sprain]

Oh, I see. Thanks. I will look into it.

[ddeboer]

@sprain Great if you can add this functionality!

[dbu]

fixed in #167