Set up omniauth for a social website

omniauth.rb

module SocialAppConfig
  ['twitter', 'renren', 'facebook', 'douban', 'tsina', 'tqq', 't163', 'kaixin', 'tsohu'].each do |auth|
    raw_config = File.read("#{Rails.root}/config/providers/#{auth}.yml")
    const_set "#{auth.upcase!}", YAML.load(raw_config)[Rails.env].symbolize_keys
  end
end

include SocialAppConfig

Rails.application.config.middleware.use OmniAuth::Builder do
  provider :twitter,  TWITTER[:app_id],   TWITTER[:app_key]
  provider :facebook, FACEBOOK[:app_id],  FACEBOOK[:app_key], {:scope => "user_photos,user_videos,publish_stream"}
  provider :renren,   RENREN[:api_key],   RENREN[:secret_key], {:scope => "publish_feed email read_user_status status_update read_user_photo read_user_like_history"}
  provider :douban,   DOUBAN[:api_key],   DOUBAN[:secret_key]
  provider :tsina,    TSINA[:api_key],    TSINA[:secret_key]
  provider :t163,     T163[:api_key],     T163[:secret_key]
  provider :tqq,      TQQ[:api_key],      TQQ[:secret_key]
  provider :tsohu,    TSOHU[:api_key],    TSOHU[:secret_key]
end