o O@sNdZddlZddlmZddlmZddlmZddZGdd d ejZdS) z3Interface to handle end to end flow of U2F signing.N)baseauthenticator)customauthenticator)localauthenticatorcCst|t|g}t|SN)rCustomAuthenticatorrLocalAuthenticatorCompositeAuthenticator)originauthenticatorsr H/tmp/google-cloud-sdk/lib/third_party/pyu2f/convenience/authenticator.pyCreateCompositeAuthenticatorsr c@s0eZdZdZddZejjfddZddZ dS) rzComposes multiple authenticators into a single authenticator. Priority is based on the order of the list initialized with the instance. cCs ||_dSr)r )selfr r r r __init__$s zCompositeAuthenticator.__init__cCs2|jD]}|r||||}|Sqtd)See base class.zNo valid authenticators found)r IsAvailable Authenticate ValueError)rapp_idchallenge_dataprint_callback authenticatorresultr r r r's z#CompositeAuthenticator.AuthenticatecCsdS)rTr )rr r r r3sz"CompositeAuthenticator.IsAvailableN) __name__ __module__ __qualname____doc__rsysstderrwriterrr r r r rs  r) rrpyu2f.conveniencerrrr BaseAuthenticatorrr r r r s