protected Optional < C > retrieveCredentials ( final WebContext context ) { try { final Optional < C > optCredentials = this . credentialsExtractor . extract ( context ) ; optCredentials . ifPresent ( credentials -> { final long t0 = System . currentTimeMillis ( ) ; try { this . authenticator . validate ( credentials , context ) ; } finally { final long t1 = System . currentTimeMillis ( ) ; logger . debug ( "Credentials validation took: {} ms" , t1 - t0 ) ; } } ) ; return optCredentials ; } catch ( CredentialsException e ) { logger . info ( "Failed to retrieve or validate credentials: {}" , e . getMessage ( ) ) ; logger . debug ( "Failed to retrieve or validate credentials" , e ) ; return Optional . empty ( ) ; } }
Retrieve the credentials .