public String getAllowedUsers(String proxyUser) {
    return getValue(String.format(TEMPLATE_PROXY_USER_ALLOWED_USERS, proxyUser),
        configurationMap,
        AmbariServerConfigurationKey.TPROXY_ALLOWED_USERS.getDefaultValue());
  }
Determines of trusted proxy support is enabled based on the configuration data.

@return <code>true</code> if trusted proxy support is enabled; <code>false</code> otherwise
@see AmbariServerConfigurationKey#TPROXY_AUTHENTICATION_ENABLED
ambari-server/src/main/java/org/apache/ambari/server/security/authentication/tproxy/AmbariTProxyConfiguration.java