private boolean contains(final String username) {
        return accounts.containsKey(username.toLowerCase(Locale.ENGLISH).trim());
    }
This is {@link InMemoryGoogleAuthenticatorTokenCredentialRepository}.

@author Misagh Moayyed
@since 5.0.0
support/cas-server-support-gauth-core/src/main/java/org/apereo/cas/gauth/credential/InMemoryGoogleAuthenticatorTokenCredentialRepository.java