+ ##
+ # Read @preferred_auth_provider and @client_app_name from oauth2 authorization request's referer
+ def parse_oauth_referer(referer)
+ referer_query = URI(referer).query if referer
+ return unless referer_query
+
+ ref_params = CGI.parse referer_query
+ preferred = ref_params["preferred_auth_provider"].first
+ @preferred_auth_provider = preferred if preferred && Settings.key?(:"#{preferred}_auth_id")
+ @client_app_name = Oauth2Application.where(:uid => ref_params["client_id"].first).pick(:name)
+ end
+