This is the unofficial OmniAuth strategy for authenticating to VKontakte via OAuth. To use it, you'll need to sign up for an OAuth2 Application ID and Secret on the Vkontakte Developers Page.

use OmniAuth::Builder do
  provider :vkontakte, ENV['API_KEY'], ENV['API_SECRET']
end

You can configure several options, which you pass in to the provider method via a Hash:

• scope: A comma-separated list of permissions you want to request from the user. Read the Vkontakte docs for more details
• display: The display context to show the authentication page. Options are: page, popup, touch and wap.

For example, to request friends, audio and photos permissions and display the authentication page in a popup window:

use OmniAuth::Builder do
  provider :vkontakte, ENV['API_KEY'], ENV['API_SECRET'],
    :scope => 'friends,audio,photos', :display => 'popup'
end

Application raise "invalid credensials" when login. The reason is csrf protection in omniauth-oauth2 1.1.0. Vkontakte doesn't return state parameter with the code, if the scope doesn't include notify.

The solution is to specify at least the notify in parameter scope, like so:

use OmniAuth::Builder do
  provider :vkontakte, ENV['API_KEY'], ENV['API_SECRET'], :scope => 'notify'
end

Tested with the following Ruby versions:

• MRI 1.9.3
• MRI 1.8.7

• Fork, fix, then send me a pull request.

Copyright (c) 2011, 2012 Anton Maminov

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