google plus problem

gistfile1.rb

def gapi_authorization(code)
    # Read in the client secrets
    client_secrets = {
      temporary_credential_uri: 'https://www.google.com/accounts/OAuthGetRequestToken',
      authorization_uri: 'https://accounts.google.com/o/oauth2/auth',
      token_credential_uri: 'https://accounts.google.com/o/oauth2/token',
      client_id: '711346440759-xxx.apps.googleusercontent.com',
      client_secret: 'xxx',
      redirect_uris: [ "oob" ]
    }

    authorization = Signet::OAuth2::Client.new(
      authorization_uri: client_secrets[:authorization_uri],
      token_credential_uri: client_secrets[:token_credential_uri],
      client_id: client_secrets[:client_id],
      client_secret: client_secrets[:client_secret],
      scope: 'https://www.googleapis.com/auth/plus.login')

    unless code.nil?
      authorization.redirect_uri = client_secrets[:redirect_uris].first
      authorization.code = code
      authorization.fetch_access_token!
    end

    return authorization
  end