public URI getAuthorizationEndpoint() throws GuacamoleException {
        return environment.getRequiredProperty(CASGuacamoleProperties.CAS_AUTHORIZATION_ENDPOINT);
    }
Returns the authorization endpoint (URI) of the CAS service as
configured with guacamole.properties.

@return
    The authorization endpoint of the CAS service, as configured with
    guacamole.properties.

@throws GuacamoleException
    If guacamole.properties cannot be parsed, or if the authorization
    endpoint property is missing.
extensions/guacamole-auth-sso/modules/guacamole-auth-sso-cas/src/main/java/org/apache/guacamole/auth/cas/conf/ConfigurationService.java