<?php

/**

 * WordPress Filesystem Class for implementing SSH2

 *

 * To use this class you must follow these steps for PHP 5.2.6+

 *

 * @contrib http://kevin.vanzonneveld.net/techblog/article/make_ssh_connections_with_php/ - Installation Notes

 *

 * Complie libssh2 (Note: Only 0.14 is officaly working with PHP 5.2.6+ right now, But many users have found the latest versions work)

 *

 * cd /usr/src

 * wget http://surfnet.dl.sourceforge.net/sourceforge/libssh2/libssh2-0.14.tar.gz

 * tar -zxvf libssh2-0.14.tar.gz

 * cd libssh2-0.14/

 * ./configure

 * make all install

 *

 * Note: Do not leave the directory yet!

 *

 * Enter: pecl install -f ssh2

 *

 * Copy the ssh.so file it creates to your PHP Module Directory.

 * Open up your PHP.INI file and look for where extensions are placed.

 * Add in your PHP.ini file: extension=ssh2.so

 *

 * Restart Apache!

 * Check phpinfo() streams to confirm that: ssh2.shell, ssh2.exec, ssh2.tunnel, ssh2.scp, ssh2.sftp  exist.

 *

 * Note: as of WordPress 2.8, This utilises the PHP5+ function 'stream_get_contents'

 *

 * @since 2.7.0

 *

 * @package WordPress

 * @subpackage Filesystem

 */

class WP_Filesystem_SSH2 extends WP_Filesystem_Base {

	public $link = false;

	/**

	 * @var resource

	 */

	public $sftp_link;

	public $keys = false;

		$this->method = 'ssh2';

		$this->errors = new WP_Error();

		//Check if possible to use ssh2 functions.

		if ( ! extension_loaded('ssh2') ) {

			$this->errors->add('no_ssh2_ext', __('The ssh2 PHP extension is not available'));

			return;

		}

		if ( !function_exists('stream_get_contents') ) {

			return;

		}

		// Set defaults:

		if ( empty($opt['port']) )

			$this->options['port'] = 22;

		else

			$this->options['port'] = $opt['port'];

		if ( empty($opt['hostname']) )

			$this->errors->add('empty_hostname', __('SSH2 hostname is required'));

		else

			$this->options['hostname'] = $opt['hostname'];

		// Check if the options provided are OK.

		if ( !empty ($opt['public_key']) && !empty ($opt['private_key']) ) {

			$this->options['public_key'] = $opt['public_key'];

			$this->options['private_key'] = $opt['private_key'];

			$this->options['hostkey'] = array('hostkey' => 'ssh-rsa');

			$this->keys = true;

		} elseif ( empty ($opt['username']) ) {

			$this->errors->add('empty_username', __('SSH2 username is required'));

		}

		if ( !empty($opt['username']) )

			$this->options['username'] = $opt['username'];

		if ( empty ($opt['password']) ) {

			// Password can be blank if we are using keys.

			if ( !$this->keys )

				$this->errors->add('empty_password', __('SSH2 password is required'));

		} else {

			$this->options['password'] = $opt['password'];

		}

	}

	public function connect() {

		if ( ! $this->keys ) {

			$this->link = @ssh2_connect($this->options['hostname'], $this->options['port']);

		} else {

			$this->link = @ssh2_connect($this->options['hostname'], $this->options['port'], $this->options['hostkey']);

		}

		if ( ! $this->link ) {

			return false;

		}

		if ( !$this->keys ) {

			if ( ! @ssh2_auth_password($this->link, $this->options['username'], $this->options['password']) ) {

				return false;

			}

		} else {

			if ( ! @ssh2_auth_pubkey_file($this->link, $this->options['username'], $this->options['public_key'], $this->options['private_key'], $this->options['password'] ) ) {

				return false;

			}

		}

		return true;

	}

	/**

	 * @param string $command

	 * @param bool $returnbool

	 */

		if ( ! $this->link )

			return false;

		if ( ! ($stream = ssh2_exec($this->link, $command)) ) {

		} else {

			stream_set_blocking( $stream, true );

			stream_set_timeout( $stream, FS_TIMEOUT );

			$data = stream_get_contents( $stream );

			fclose( $stream );

			if ( $returnbool )

				return ( $data === false ) ? false : '' != trim($data);

			else

				return $data;

		}

		return false;

	}

	/**

	 * @param string $file

	 * @return string|false

	 */

	public function get_contents( $file ) {

	}

	/**

	 * @param string $file

	 * @return array

	 */

	public function get_contents_array($file) {

	}

	/**

	 * @param bool|int $mode

	 * @return bool

	 */

	public function put_contents($file, $contents, $mode = false ) {

		if ( $ret !== strlen( $contents ) )

			return false;

		$this->chmod($file, $mode);

		return true;

	}

	public function cwd() {

		if ( $cwd ) {

			$cwd = trailingslashit( trim( $cwd ) );

		}

		return $cwd;

	}

	/**

	 * @param string $dir

	 * @return bool|string

	 */

	public function chdir($dir) {

		return $this->run_command('cd ' . $dir, true);

	}

	/**

	 * @param string $file

	 * @param string $group

	 */

	public function chgrp($file, $group, $recursive = false ) {

		if ( ! $this->exists($file) )

			return false;

		if ( ! $recursive || ! $this->is_dir($file) )

			return $this->run_command(sprintf('chgrp %s %s', escapeshellarg($group), escapeshellarg($file)), true);

		return $this->run_command(sprintf('chgrp -R %s %s', escapeshellarg($group), escapeshellarg($file)), true);

	}

	/**

	 * @param string $file

	 * @return bool|string

	 */

	public function chmod($file, $mode = false, $recursive = false) {

		if ( ! $this->exists($file) )

			return false;

		if ( ! $mode ) {

			if ( $this->is_file($file) )

				$mode = FS_CHMOD_FILE;

			elseif ( $this->is_dir($file) )

				$mode = FS_CHMOD_DIR;

			else

				return false;

		}

		if ( ! $recursive || ! $this->is_dir($file) )

			return $this->run_command(sprintf('chmod %o %s', $mode, escapeshellarg($file)), true);

		return $this->run_command(sprintf('chmod -R %o %s', $mode, escapeshellarg($file)), true);

	}

	/**

	 * Change the ownership of a file / folder.

	 *

	 *

	 */

	public function chown( $file, $owner, $recursive = false ) {

		if ( ! $this->exists($file) )

			return false;

		if ( ! $recursive || ! $this->is_dir($file) )

			return $this->run_command(sprintf('chown %s %s', escapeshellarg($owner), escapeshellarg($file)), true);

		return $this->run_command(sprintf('chown -R %s %s', escapeshellarg($owner), escapeshellarg($file)), true);

	}

	/**

	 * @param string $file

	 * @return string|false

	 */

	public function owner($file) {

		if ( ! $owneruid )

			return false;

		if ( ! function_exists('posix_getpwuid') )

			return $owneruid;

		$ownerarray = posix_getpwuid($owneruid);

		return $ownerarray['name'];

	}

	/**

	 * @param string $file

	 * @return string

	 */

	public function getchmod($file) {

	}

	/**

	 * @param string $file

	 * @return string|false

	 */

	public function group($file) {

		if ( ! $gid )

			return false;

		if ( ! function_exists('posix_getgrgid') )

			return $gid;

		$grouparray = posix_getgrgid($gid);

		return $grouparray['name'];

	}

	/**

	 * @param int|bool $mode

	 * @return bool

	 */

	public function copy($source, $destination, $overwrite = false, $mode = false) {

		if ( ! $overwrite && $this->exists($destination) )

			return false;

		$content = $this->get_contents($source);

		if ( false === $content)

			return false;

		return $this->put_contents($destination, $content, $mode);

	}

	/**

	 * @param string $source

	 * @param string $destination

	 * @return bool

	 */

	public function move($source, $destination, $overwrite = false) {

		return @ssh2_sftp_rename( $this->sftp_link, $source, $destination );

	}

	/**

	 * @param string|bool $type

	 * @return bool

	 */

	public function delete($file, $recursive = false, $type = false) {