Method checkDb

/**
 * Verifies database connection
 *
 * @param   array  $options  Options array
 *
 * @return boolean|\Joomla\Database\DatabaseInterface
 *
 * @since 4.0.0
 * @throws \Exception
 */
public function checkDb($options) : bool
{
    // Ensure a database type was selected.
    if (empty($options['dbtype'])) {
        $this->ioStyle->error(Text::_('INSTL_DATABASE_INVALID_TYPE'));
        return false;
    }
    // Ensure that a hostname and user name were input.
    if (empty($options['host']) || empty($options['user'])) {
        $this->ioStyle->error(Text::_('INSTL_DATABASE_INVALID_DB_DETAILS'));
        return false;
    }
    // Validate database table prefix.
    if (isset($options['dbprefix']) && !preg_match('#^[a-zA-Z]+[a-zA-Z0-9_]*$#', $options['dbprefix'])) {
        $this->ioStyle->error(Text::_('INSTL_DATABASE_PREFIX_MSG'));
        return false;
    }
    // Validate length of database table prefix.
    if (isset($options['dbprefix']) && strlen($options['dbprefix']) > 15) {
        $this->ioStyle->error(Text::_('INSTL_DATABASE_FIX_TOO_LONG'), 'warning');
        return false;
    }
    // Validate length of database name.
    if (strlen($options['db']) > 64) {
        $this->ioStyle->error(Text::_('INSTL_DATABASE_NAME_TOO_LONG'));
        return false;
    }
    // Validate database name.
    if (in_array($options['dbtype'], ['pgsql', 'postgresql'], true) && !preg_match('#^[a-zA-Z_][0-9a-zA-Z_$]*$#', $options['db'])) {
        $this->ioStyle->error(Text::_('INSTL_DATABASE_NAME_MSG_POSTGRES'));
        return false;
    }
    if (in_array($options['dbtype'], ['mysql', 'mysqli']) && preg_match('#[\\\\\\/]#', $options['db'])) {
        $this->ioStyle->error(Text::_('INSTL_DATABASE_NAME_MSG_MYSQL'));
        return false;
    }
    // Workaround for UPPERCASE table prefix for PostgreSQL
    if (in_array($options['dbtype'], ['pgsql', 'postgresql'])) {
        if (isset($options['dbprefix']) && strtolower($options['dbprefix']) !== $options['dbprefix']) {
            $this->ioStyle->error(Text::_('INSTL_DATABASE_FIX_LOWERCASE'));
            return false;
        }
    }
    $app = $this->getApplication();
    // Check db connection encryption properties
    $model = $app->bootComponent('com_config')->getMVCFactory($app)->createModel('Application', 'Administrator');
    if (!$model->validateDbConnection($options)) {
        $this->ioStyle->error(Text::_('Failed to validate the db connection encryption properties'));
        return false;
    }
    // Build the connection options array.
    $settings = ['driver' => $options['dbtype'], 'host' => $options['host'], 'user' => $options['user'], 'password' => $options['password'], 'database' => $options['db'], 'prefix' => $options['dbprefix']];
    if ((int) $options['dbencryption'] !== 0) {
        $settings['ssl'] = ['enable' => true, 'verify_server_cert' => (bool) $options['dbsslverifyservercert']];
        foreach (['cipher', 'ca', 'key', 'cert'] as $value) {
            $confVal = trim($options['dbssl' . $value]);
            if ($confVal !== '') {
                $settings['ssl'][$value] = $confVal;
            }
        }
    }
    // Get a database object.
    try {
        $db = DatabaseDriver::getInstance($settings);
        $db->getVersion();
    } catch (\Exception $e) {
        $this->ioStyle->error(Text::sprintf('Cannot connect to database, verify that you specified the correct database details %s', $e->getMessage()));
        return false;
    }
    if ((int) $options['dbencryption'] !== 0 && empty($db->getConnectionEncryption())) {
        if ($db->isConnectionEncryptionSupported()) {
            $this->ioStyle->error(Text::_('COM_CONFIG_ERROR_DATABASE_ENCRYPTION_CONN_NOT_ENCRYPT'));
        } else {
            $this->ioStyle->error(Text::_('COM_CONFIG_ERROR_DATABASE_ENCRYPTION_SRV_NOT_SUPPORTS'));
        }
        return false;
    }
    return true;
}