Add Central Authentication Service support

[Claudius Henrichs <claudius.h@…>]

Use case:
We want to use Transifex as the localization tool of our choice for the Mer and on the long run for the Maemo project. For setting up our own Transifex site we'd like to integrate it into our existing single-sign-on infrastructure which is using the Central Authentication Service (CAS).

This is a feature request to add Central Authentication Service support to Transifex.

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Ressources:
Python CAS implementation:  http://www.cs.princeton.edu/courses/archive/spr08/cos333/CAS.html
Django CAS implementation:  http://github.com/Nitron/django-cas-provider/tree/master

Further information:
Central Authentication Service project:  http://www.jasig.org/cas
 http://en.wikipedia.org/wiki/Central_Authentication_Service

[glezos]

Quoting from the mailing list:

I've found one (and maybe two) ready-made Django consumer for CAS
backends. django-cas seems to be pretty OK:

 http://code.google.com/p/django-cas/

It seems that writing one's own authentication backend isn't
necessary, although the CAS consumer needs a way to pull the data. So
at some point an implementation of ``class
PopulatedCASBackend(CASBackend)`` will take place (probably in
``transifex/auth/cas``).

I don't have much experience with CAS, so I wasn't able to test right
away. With some more details on your CAS server setup, I believe I
could experiment using django-cas to connect to it. My plan would be
to tweak our 'simpleauth' application to use CAS if it's enabled.

[glezos]

No activity seen for a while, will be closing this as wontfix. Additionally, Maemo will start using gitorious and github via transifex.net anyway. =)