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Django Auth: Use external service (without Django-social-app)

How could I do to allow users to link their Gmail or Facebook account in my Django App ?
I'd like to avoid my clients to register in my site if they have an account in any of the common sites (Gmail, Facebook etc...)
I know the app Django Social Auth can be used for this purposes but I'd like to know how to do this auth by my own.
Can anyone point me to some documentation or small example ?
I'd like to do this kind of authentication by my own, without external app, I'm looking for information not anybody to solve my code
Thanks

Actually, you can try to find an example how to use OAuth2 technology in Django from different django app. I use django-allauth and you can try to copy some techniques from them.

user system with social authentication in django

I've read about a lot of different apps for django for integrating social authentication to django projects. But, I'm having some trouble understanding how this integration works
Does it extends the default USER models? Where do I find those kind of information in the applications?
I basically need a user system that has groups (for permission purposes). The user would be able to register using a common registration proccess or facebook. Will I be able to achieve that with any kind of application?
Thanks in advance.

There is an app called django-allauth. If you read their official documentation, it is pretty easy to follow. As per their instructions, you install the core app, and any other authentication you need (like facebook, oauth which google uses). Then, you have to go to facebook, get developers key, and add it to your django admin.
Basically, when somebody tries to login using facebook, the signin process sends the keys to facebook, and check if the user exists. If it does, then the authentication app creates user on the backend, just like a normal signin process. You can get javascript from facebook to make a login window.

Which openid / oauth library to connect a django project to Google Apps Accounts?

I'm working on an intranet django project (not using GAE) for a company that uses Google Apps for login. So I'd like my users to be able to log in to my django project using their google accounts login. OpenID seems appropriate, although maybe Oauth might work too?
I see a lot of similarly named libraries out there to connect django's auth system to external login systems:
django-authopenid - http://bitbucket.org/benoitc/django-authopenid
django-openid - http://github.com/simonw/django-openid
django-openidauth - http://code.google.com/p/django-openid-auth/
django-oauth - http://bitbucket.org/david/django-oauth
Here's what I'd like to do with the integration: Have users login with their google accounts, instead of the native django system. Keep django's permissions model for things like the admin system. So I think that means automatically creating a new user record in django the first time a new account we haven't seen before logs in.
Can anyone with experience using any of these projects advise me on which would work best? Or just advice on which are most active / functional if you've tried them? Thanks!

I finally got this working, so I'll answer my own question since the previous answers here were helpful but don't tell the whole story.
django-openid-auth is actually quite easy to set up and use. The README file is very clear. If you just want to use standard google accounts (i.e. #gmail.com addresses) then you configure it in settings.py with:
OPENID_SSO_SERVER_URL = 'https://www.google.com/accounts/o8/id'
But if you want to use a "google apps" account, i.e. hosted gmail at your own company's domain, then it's more complicated. I got my details from this question. To use your google apps accounts, configure your settings.py to:
OPENID_SSO_SERVER_URL = 'https://www.google.com/accounts/o8/site-xrds?hd=example.com'
# replace example.com with your hosted google apps domain
In the future this might just work, but today it probably won't. The problem is in python-openid which django-openid-auth relies on. The standard build of python-openid doesn't understand some protocol extensions google is using. (Why does google need to extend the protocol? Dig through http://groups.google.com/group/google-federated-login-api/web/openid-discovery-for-hosted-domains and report back. Good luck.) So you need to instead use adieu's patch to python-openid, which is available here:
http://github.com/adieu/python-openid
Install this over your existing python-openid. Now it should work.
Be careful with the OPENID_USE_AS_ADMIN_LOGIN setting since it requires you to have an openid user account which is 'staff' or 'superuser' to use admin which won't happen by default. So you'll need to do a 2-step process of enabling openid, logging in with your openid to create an account in django, then using your old admin account to mark your own openid account as superuser, and then disabling non-openid admin access.
One more thing: your domain admin might need to enable openid login for your domain before this will work. The control is at http://www.google.com/a/cpanel/example.com/SetupIdp

I've used django-openid-auth. Works fine, can create user account when signing first time. You also can associate openid login with user account in django admin panel.

I know this is a late answer, but I'm doing similar stuff and I just discovered django-socialregistration. which basically does OAuth, OpenID, Facebook Connect, etc. Unlike some of the other options it seems to be actively developed and used by a lot of projects.

I liked that Django socialregistration allowed me to plug in Google Accounts, Facebook, Yahoo and any other OpenID site pretty easily. You just need to give the provider as a link like so:
<img src="{{MEDIA_URL}}/images/yahoo.png"/>

They are all almost identical. I like django-authopenid. It has great documentation and is extremely easy to use. It'll do exactly what you want and do it better than django-openid (which is the only other one I have tried).
HTH

Can I use the google chat image on google app engine?

I am writing an app using python on GAE. I figure since I'm using google logins as the authentication for my users, why can't I use each users google chat picture as their user portrait? However I haven't found a way to access that info. Maybe I've been using facebook api's for too long, but is there any way to access that information?
Chris

There is a separate API for retrieving a user's profile information, which unfortunately does not currently support profile pictures.

Facebook connect on Google App Engine with Django Patch

We are building a website on Google App Engine, using django patch.
We would like to use Facebook connect for two purposes:
Authenticate users.
Access user's social data.
Searching for a solution in the usual places (google, FB, SO) brigs up a lot of noise, many partial solutions and no clear answer.
So the question is this: does anyone has a clear working solution? maybe even a recipe?
Thanks.

Honza: we where looking for something that also does authentication Django style.
We ended up doing the login on the client side than sending an AJAX request to Django and wrote our own authenticate/login logic.
Once we get the user's credentials, we use PyFacebook for FB connectivity.