Thursday, November 24, 2011

django-social-auth: Installing and troubleshooting « William John Bert

Thanks to django-registration, I was able to build a working account registration/login system pretty easily. But I wanted to give users the ability to use their existing accounts through popular services such as Facebook, Twitter, etc., rather than have to create yet another account. Here’s how I did it.

Sorting Through the Choices

There are a number of reusable Django apps out there to help with registration/login from social media sites. I found this Review of 4 Django Social Auth apps very helpful in sorting out the options. After reading it, I was left to choose between django-social-auth and django-allauth. In the end, I went with django-social-auth (not to be confused with django-socialauth) because a friend had recommended it and because I’d already installed it before I read this article. However, the article’s conclusion that django-allauth is best out of the box also seems valid.

Installation

The instructions in django-social-auth‘s docs are helpful in walking you through available settings and options.

I also found the included example app useful. To use this app, I cloned django-social-auth‘s git repo, created a virtualenv called django-social-auth, ran pip install -r requirements.txt inside this virtualenv to install all the required apps, ran manage.py syncdb, and finally ran manage.py runserver. Voila, example app is up and running at 127.0.0.1, showing a simple screen with options to login through about a dozen different different services.

API Keys

The first service I tested was Twitter. I use it more than any others, and I already had the API keys for it. I threw my API key and secret key into the example local_settings.py file provided with django-social-auth and tried to log in via the example app. Boom: 401 Unauthorized. I double-checked all my settings and installation and whatnot. Seemed fine.

I turned my attention to the API keys. The ones I had were generated for Readsr, i.e., I entered readsrs.com as the domain when I generated them at dev.twitter.com. But now I was running on localhost, 127.0.0.1, so I suspected the readsrs.com keys wouldn’t be valid. I wasn’t sure whether Twitter would hand over a new consumer key for 127.0.0.1, or baulk at the request. (It seemed like it should do so, but I hadn’t seen any instructions anywhere that said to get a key for your development machine.) Turns out Twitter will happily give you a key for 127.0.0.1. Once I plugged the new keys in, I was able to log in with my Twitter credentials, and just as it should, django-social-auth automatically created an auth.user for this account.

Integrating with Readsr

I followed the instructions again to config my own app, Readsr. To add a login option using Twitter credentials, I put a link to the reversed view that begins the django-social-auth login process for twitter, i.e., {% url socialauth_begin "twitter" %}, to my login template. And it worked.

I still need to fix a few oddities. For example, Twitter returns my first and last names together in first_name (or else django-social-auth is concatenating them into that column), and doesn’t supply any email address. But the basic functionality is there, and was relatively easy to achieve.

Postscript

The author of the article I linked above had an error using OpenID when using django-social-auth, which is why he preferred django-authall. He filed a bug for the error he got, and I notice that it was closed 15 hours ago (though if you read the comments, it seems it was actually fixed back in mid-July). Good timing.

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