public boolean isValid() {
        return response.isValid();
    }
Returns whether the identity asserted by the original SAML response is
still valid. An asserted identity may cease to be valid after creation
if it has expired according to the timestamps included in the response.

@return
    true if the original SAML response is still valid, false otherwise.
extensions/guacamole-auth-sso/modules/guacamole-auth-sso-saml/src/main/java/org/apache/guacamole/auth/saml/acs/AssertedIdentity.java