provider :openid, openid_options
provider :google_oauth2, GOOGLE_AUTH_ID, GOOGLE_AUTH_SECRET, google_options if defined?(GOOGLE_AUTH_ID)
provider :facebook, FACEBOOK_AUTH_ID, FACEBOOK_AUTH_SECRET, facebook_options if defined?(FACEBOOK_AUTH_ID)
provider :openid, openid_options
provider :google_oauth2, GOOGLE_AUTH_ID, GOOGLE_AUTH_SECRET, google_options if defined?(GOOGLE_AUTH_ID)
provider :facebook, FACEBOOK_AUTH_ID, FACEBOOK_AUTH_SECRET, facebook_options if defined?(FACEBOOK_AUTH_ID)