class SSH

class SSH extends FileTransfer implements ChmodInterface {
    
    /**
     * {@inheritdoc}
     */
    public function __construct($jail, $username, $password, $hostname = "localhost", $port = 22) {
        $this->username = $username;
        $this->password = $password;
        $this->hostname = $hostname;
        $this->port = $port;
        parent::__construct($jail);
    }
    
    /**
     * {@inheritdoc}
     */
    public function connect() {
        $this->connection = @ssh2_connect($this->hostname, $this->port);
        if (!$this->connection) {
            throw new FileTransferException('SSH Connection failed to @host:@port', NULL, [
                '@host' => $this->hostname,
                '@port' => $this->port,
            ]);
        }
        if (!@ssh2_auth_password($this->connection, $this->username, $this->password)) {
            throw new FileTransferException('The supplied username/password combination was not accepted.');
        }
    }
    
    /**
     * {@inheritdoc}
     */
    public static function factory($jail, $settings) {
        $username = empty($settings['username']) ? '' : $settings['username'];
        $password = empty($settings['password']) ? '' : $settings['password'];
        $hostname = empty($settings['advanced']['hostname']) ? 'localhost' : $settings['advanced']['hostname'];
        $port = empty($settings['advanced']['port']) ? 22 : $settings['advanced']['port'];
        return new SSH($jail, $username, $password, $hostname, $port);
    }
    
    /**
     * {@inheritdoc}
     */
    protected function copyFileJailed($source, $destination) {
        if (!@ssh2_scp_send($this->connection, $source, $destination)) {
            throw new FileTransferException('Cannot copy @source_file to @destination_file.', NULL, [
                '@source' => $source,
                '@destination' => $destination,
            ]);
        }
    }
    
    /**
     * {@inheritdoc}
     */
    protected function copyDirectoryJailed($source, $destination) {
        if (@(!ssh2_exec($this->connection, 'cp -Rp ' . escapeshellarg($source) . ' ' . escapeshellarg($destination)))) {
            throw new FileTransferException('Cannot copy directory @directory.', NULL, [
                '@directory' => $source,
            ]);
        }
    }
    
    /**
     * {@inheritdoc}
     */
    protected function createDirectoryJailed($directory) {
        if (@(!ssh2_exec($this->connection, 'mkdir ' . escapeshellarg($directory)))) {
            throw new FileTransferException('Cannot create directory @directory.', NULL, [
                '@directory' => $directory,
            ]);
        }
    }
    
    /**
     * {@inheritdoc}
     */
    protected function removeDirectoryJailed($directory) {
        if (@(!ssh2_exec($this->connection, 'rm -Rf ' . escapeshellarg($directory)))) {
            throw new FileTransferException('Cannot remove @directory.', NULL, [
                '@directory' => $directory,
            ]);
        }
    }
    
    /**
     * {@inheritdoc}
     */
    protected function removeFileJailed($destination) {
        if (!@ssh2_exec($this->connection, 'rm ' . escapeshellarg($destination))) {
            throw new FileTransferException('Cannot remove @directory.', NULL, [
                '@directory' => $destination,
            ]);
        }
    }
    
    /**
     * Implements Drupal\Core\FileTransfer\FileTransfer::isDirectory().
     *
     * WARNING: This is untested. It is not currently used, but should do the
     * trick.
     */
    public function isDirectory($path) {
        $directory = escapeshellarg($path);
        $cmd = "[ -d {$directory} ] && echo 'yes'";
        if ($output = @ssh2_exec($this->connection, $cmd)) {
            if ($output == 'yes') {
                return TRUE;
            }
            return FALSE;
        }
        else {
            throw new FileTransferException('Cannot check @path.', NULL, [
                '@path' => $path,
            ]);
        }
    }
    
    /**
     * {@inheritdoc}
     */
    public function isFile($path) {
        $file = escapeshellarg($path);
        $cmd = "[ -f {$file} ] && echo 'yes'";
        if ($output = @ssh2_exec($this->connection, $cmd)) {
            if ($output == 'yes') {
                return TRUE;
            }
            return FALSE;
        }
        else {
            throw new FileTransferException('Cannot check @path.', NULL, [
                '@path' => $path,
            ]);
        }
    }
    
    /**
     * {@inheritdoc}
     */
    public function chmodJailed($path, $mode, $recursive) {
        $cmd = sprintf("chmod %s%o %s", $recursive ? '-R ' : '', $mode, escapeshellarg($path));
        if (@(!ssh2_exec($this->connection, $cmd))) {
            throw new FileTransferException('Cannot change permissions of @path.', NULL, [
                '@path' => $path,
            ]);
        }
    }
    
    /**
     * {@inheritdoc}
     */
    public function getSettingsForm() {
        $form = parent::getSettingsForm();
        $form['advanced']['port']['#default_value'] = 22;
        return $form;
    }

}