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Omniauth google oauth2 strategy with offline access
Rails.application.config.middleware.use OmniAuth::Builder do
  provider :google_oauth2, KEY, SECRET,
  :access_type => 'offline',
  :scope => 'https://www.googleapis.com/auth/userinfo.profile'
end

def authorize_params
    base_scope_url = "https://www.googleapis.com/auth/"
    super.tap do |params|
      scopes = (params[:scope] || DEFAULT_SCOPE).split(",")
      scopes.map! { |s| s =~ /^https?:/// ? s : "#{base_scope_url}#{s}" }
      params[:scope] = scopes.join(' ')
      # This makes sure we get a refresh_token.
      # http://googlecode.blogspot.com/2011/10/upcoming-changes-to-oauth-20-endpoint.html
      **params[:access_type] = 'offline' if params[:access_type].nil?
      params[:approval_prompt] = 'force' if params[:approval_prompt].nil?**
    end
  end