<?php

/**

 * The SSH connection class for the update module.

 */

class FileTransferSSH extends FileTransfer implements FileTransferChmodInterface {

  function __construct($jail, $username, $password, $hostname = "localhost", $port = 22) {

    $this->username = $username;

    $this->password = $password;

    $this->hostname = $hostname;

    $this->port = $port;

    parent::__construct($jail);

  }

  function connect() {

    $this->connection = @ssh2_connect($this->hostname, $this->port);

    if (!$this->connection) {

      throw new FileTransferException('SSH Connection failed to @host:@port', NULL, array('@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.');

    }

  }

  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 FileTransferSSH($jail, $username, $password, $hostname, $port);

  }

  protected function copyFileJailed($source, $destination) {

    if (!@ssh2_scp_send($this->connection, $source, $destination)) {

      throw new FileTransferException('Cannot copy @source_file to @destination_file.', NULL, array('@source' => $source, '@destination' => $destination));

    }

  }

  protected function copyDirectoryJailed($source, $destination) {

    if (@!ssh2_exec($this->connection, 'cp -Rp ' . escapeshellarg($source) . ' ' . escapeshellarg($destination))) {

      throw new FileTransferException('Cannot copy directory @directory.', NULL, array('@directory' => $source));

    }

  }

  protected function createDirectoryJailed($directory) {

    if (@!ssh2_exec($this->connection, 'mkdir ' . escapeshellarg($directory))) {

      throw new FileTransferException('Cannot create directory @directory.', NULL, array('@directory' => $directory));

    }

  }

  protected function removeDirectoryJailed($directory) {

    if (@!ssh2_exec($this->connection, 'rm -Rf ' . escapeshellarg($directory))) {

      throw new FileTransferException('Cannot remove @directory.', NULL, array('@directory' => $directory));

    }

  }

  protected function removeFileJailed($destination) {

    if (!@ssh2_exec($this->connection, 'rm ' . escapeshellarg($destination))) {

      throw new FileTransferException('Cannot remove @directory.', NULL, array('@directory' => $destination));

    }

  }

  /**

   * 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, array('@path' => $path));

    }

  }

  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, array('@path' => $path));

    }

  }

  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, array('@path' => $path));

    }

  }

  /**

   * Returns the form to configure the FileTransfer class for SSH.

   */

  public function getSettingsForm() {

    $form = parent::getSettingsForm();

    $form['advanced']['port']['#default_value'] = 22;

    return $form;

  }

}