server = $server; $this->server->on('beforeMethod:*', [$this, 'beforeHandler'], 200); } /** * Detects all unsupported clients and throws a \Sabre\DAV\Exception\Forbidden * exception which will result in a 403 to them. * @param RequestInterface $request * @throws \Sabre\DAV\Exception\Forbidden If the client version is not supported */ public function beforeHandler(RequestInterface $request) { $userAgent = $request->getHeader('User-Agent'); if ($userAgent === null) { return; } $minimumSupportedDesktopVersion = $this->config->getSystemValueString('minimum.supported.desktop.version', '2.7.0'); $maximumSupportedDesktopVersion = $this->config->getSystemValueString('maximum.supported.desktop.version', '99.99.99'); // Check if the client is a desktop client preg_match(IRequest::USER_AGENT_CLIENT_DESKTOP, $userAgent, $versionMatches); // If the client is a desktop client and the version is too old, block it if (isset($versionMatches[1]) && version_compare($versionMatches[1], $minimumSupportedDesktopVersion) === -1) { $customClientDesktopLink = htmlspecialchars($this->themingDefaults->getSyncClientUrl()); $minimumSupportedDesktopVersion = htmlspecialchars($minimumSupportedDesktopVersion); throw new \Sabre\DAV\Exception\Forbidden("This version of the client is unsupported. Upgrade to version $minimumSupportedDesktopVersion or later."); } // If the client is a desktop client and the version is too new, block it if (isset($versionMatches[1]) && version_compare($versionMatches[1], $maximumSupportedDesktopVersion) === 1) { $customClientDesktopLink = htmlspecialchars($this->themingDefaults->getSyncClientUrl()); $maximumSupportedDesktopVersion = htmlspecialchars($maximumSupportedDesktopVersion); throw new \Sabre\DAV\Exception\Forbidden("This version of the client is unsupported. Downgrade to version $maximumSupportedDesktopVersion or earlier."); } } }