owncloud / core

	 */

	public function requestSharedSecret($url, $token) {

		if ($this->trustedServers->isTrustedServer($url) === false) {

			$this->logger->error('remote server not trusted (' . $url . ') while requesting shared secret', ['app' => 'federation']);

			return ['statuscode' => Http::STATUS_FORBIDDEN];

		}

		// if both server initiated the exchange of the shared secret the greater

		// token wins

		// if both server initiated the exchange of the shared secret the greater

		// token wins

		$localToken = $this->dbHandler->getToken($url);

		if (strcmp($localToken, $token) > 0) {

			$this->logger->info(

				'remote server (' . $url . ') presented lower token. We will initiate the exchange of the shared secret.',

				['app' => 'federation']

			);

			return ['statuscode' => Http::STATUS_FORBIDDEN];

		}

		// we ask for the shared secret so we no longer have to ask the other server

		// to request the shared secret

	 */

	public function getSharedSecret($url, $token) {

		if ($this->trustedServers->isTrustedServer($url) === false) {

			$this->logger->error('remote server not trusted (' . $url . ') while getting shared secret', ['app' => 'federation']);

			return ['statuscode' => Http::STATUS_FORBIDDEN];

		}

		if ($this->isValidToken($url, $token) === false) {

			$expectedToken = $this->dbHandler->getToken($url);