io.ktor.auth.io.ktor.application.ApplicationCall -

authentication	`val ApplicationCall.authentication: AuthenticationContext` Retrieves an AuthenticationContext for `this` call
digestAuthenticationCredentials	`fun ApplicationCall.digestAuthenticationCredentials(): DigestCredential?` Retrieves DigestCredential from this call
principal	`fun <P : Principal> ApplicationCall.principal(): P?` Retrieves authenticated Principal for `this` call