<?php

/**

 * Base WordPress Filesystem

 *

 * @package WordPress

 * @subpackage Filesystem

 */

/**

 * Base WordPress Filesystem class for which Filesystem implementations extend

 *

 * @since 2.5.0

 */

class WP_Filesystem_Base {

	/**

	 * Whether to display debug data for the connection.

	 *

	 * @access public

	 * @since 2.5.0

	 * @var bool

	 */

	var $verbose = false;

	/**

	 * Cached list of local filepaths to mapped remote filepaths.

	 *

	 * @access private

	 * @since 2.7.0

	 * @var array

	 */

	var $cache = array();

	/**

	 * The Access method of the current connection, Set automatically.

	 *

	 * @access public

	 * @since 2.5.0

	 * @var string

	 */

	var $method = '';

	/**

	 * Constructor (empty).

	 */

	function __construct() {}

	/**

	 * Return the path on the remote filesystem of ABSPATH.

	 *

	 * @access public

	 * @since 2.7.0

	 *

	 * @return string The location of the remote path.

	 */

	function abspath() {

		$folder = $this->find_folder(ABSPATH);

		// Perhaps the FTP folder is rooted at the WordPress install, Check for wp-includes folder in root, Could have some false positives, but rare.

		if ( ! $folder && $this->is_dir('/wp-includes') )

			$folder = '/';

		return $folder;

	}

	/**

	 * Return the path on the remote filesystem of WP_CONTENT_DIR.

	 *

	 * @access public

	 * @since 2.7.0

	 *

	 * @return string The location of the remote path.

	 */

	function wp_content_dir() {

		return $this->find_folder(WP_CONTENT_DIR);

	}

	/**

	 * Return the path on the remote filesystem of WP_PLUGIN_DIR.

	 *

	 * @access public

	 * @since 2.7.0

	 *

	 * @return string The location of the remote path.

	 */

	function wp_plugins_dir() {

		return $this->find_folder(WP_PLUGIN_DIR);

	}

	/**

	 * Return the path on the remote filesystem of the Themes Directory.

	 *

	 * @access public

	 * @since 2.7.0

	 *

	 * @param string $theme The Theme stylesheet or template for the directory.

	 * @return string The location of the remote path.

	 */

	function wp_themes_dir( $theme = false ) {

		$theme_root = get_theme_root( $theme );

		// Account for relative theme roots

		if ( '/themes' == $theme_root || ! is_dir( $theme_root ) )

			$theme_root = WP_CONTENT_DIR . $theme_root;

		return $this->find_folder( $theme_root );

	}

	/**

	 * Return the path on the remote filesystem of WP_LANG_DIR.

	 *

	 * @access public

	 * @since 3.2.0

	 *

	 * @return string The location of the remote path.

	 */

	function wp_lang_dir() {

		return $this->find_folder(WP_LANG_DIR);

	}

	/**

	 * Locate a folder on the remote filesystem.

	 *

	 * @access public

	 * @since 2.5.0

	 * @deprecated 2.7.0 use WP_Filesystem::abspath() or WP_Filesystem::wp_*_dir() instead.

	 * @see WP_Filesystem::abspath()

	 * @see WP_Filesystem::wp_content_dir()

	 * @see WP_Filesystem::wp_plugins_dir()

	 * @see WP_Filesystem::wp_themes_dir()

	 * @see WP_Filesystem::wp_lang_dir()

	 *

	 * @param string $base The folder to start searching from.

	 * @param bool   $echo True to display debug information.

	 *                     Default false.

	 * @return string The location of the remote path.

	 */

	function find_base_dir( $base = '.', $echo = false ) {

		_deprecated_function(__FUNCTION__, '2.7', 'WP_Filesystem::abspath() or WP_Filesystem::wp_*_dir()' );

		$this->verbose = $echo;

		return $this->abspath();

	}

	/**

	 * Locate a folder on the remote filesystem.

	 *

	 * @access public

	 * @since 2.5.0

	 * @deprecated 2.7.0 use WP_Filesystem::abspath() or WP_Filesystem::wp_*_dir() methods instead.

	 * @see WP_Filesystem::abspath()

	 * @see WP_Filesystem::wp_content_dir()

	 * @see WP_Filesystem::wp_plugins_dir()

	 * @see WP_Filesystem::wp_themes_dir()

	 * @see WP_Filesystem::wp_lang_dir()

	 *

	 * @param string $base The folder to start searching from.

	 * @param bool   $echo True to display debug information.

	 * @return string The location of the remote path.

	 */

	function get_base_dir( $base = '.', $echo = false ) {

		_deprecated_function(__FUNCTION__, '2.7', 'WP_Filesystem::abspath() or WP_Filesystem::wp_*_dir()' );

		$this->verbose = $echo;

		return $this->abspath();

	}

	/**

	 * Locate a folder on the remote filesystem.

	 *

	 * Assumes that on Windows systems, Stripping off the Drive

	 * letter is OK Sanitizes \\ to / in windows filepaths.

	 *

	 * @access public

	 * @since 2.7.0

	 *

	 * @param string $folder the folder to locate.

	 * @return string The location of the remote path.

	 */

	function find_folder( $folder ) {

		if ( isset( $this->cache[ $folder ] ) )

			return $this->cache[ $folder ];

		if ( stripos($this->method, 'ftp') !== false ) {

			$constant_overrides = array(

				'FTP_BASE' => ABSPATH,

				'FTP_CONTENT_DIR' => WP_CONTENT_DIR,

				'FTP_PLUGIN_DIR' => WP_PLUGIN_DIR,

				'FTP_LANG_DIR' => WP_LANG_DIR

			);

			// Direct matches ( folder = CONSTANT/ )

			foreach ( $constant_overrides as $constant => $dir ) {

				if ( ! defined( $constant ) )

					continue;

				if ( $folder === $dir )

					return trailingslashit( constant( $constant ) );

			}

			// Prefix Matches ( folder = CONSTANT/subdir )

			foreach ( $constant_overrides as $constant => $dir ) {

				if ( ! defined( $constant ) )

					continue;

				if ( 0 === stripos( $folder, $dir ) ) { // $folder starts with $dir

					$potential_folder = preg_replace( '#^' . preg_quote( $dir, '#' ) . '/#i', trailingslashit( constant( $constant ) ), $folder );

					$potential_folder = trailingslashit( $potential_folder );

					if ( $this->is_dir( $potential_folder ) ) {

						$this->cache[ $folder ] = $potential_folder;

						return $potential_folder;

					}

				}

			}

		} elseif ( 'direct' == $this->method ) {

			$folder = str_replace('\\', '/', $folder); // Windows path sanitisation

			return trailingslashit($folder);

		}

		$folder = preg_replace('|^([a-z]{1}):|i', '', $folder); // Strip out windows drive letter if it's there.

		$folder = str_replace('\\', '/', $folder); // Windows path sanitisation

		if ( isset($this->cache[ $folder ] ) )

			return $this->cache[ $folder ];

		if ( $this->exists($folder) ) { // Folder exists at that absolute path.

			$folder = trailingslashit($folder);

			$this->cache[ $folder ] = $folder;

			return $folder;

		}

		if ( $return = $this->search_for_folder($folder) )

			$this->cache[ $folder ] = $return;

		return $return;

	}

	/**

	 * Locate a folder on the remote filesystem.

	 *

	 * Expects Windows sanitized path.

	 *

	 * @access private

	 * @since 2.7.0

	 *

	 * @param string $folder The folder to locate.

	 * @param string $base   The folder to start searching from.

	 * @param bool   $loop   If the function has recursed, Internal use only.

	 * @return string The location of the remote path.

	 */

	function search_for_folder( $folder, $base = '.', $loop = false ) {

		if ( empty( $base ) || '.' == $base )

			$base = trailingslashit($this->cwd());

		$folder = untrailingslashit($folder);

		if ( $this->verbose )

			printf( "\n" . __('Looking for %1$s in %2$s') . "<br/>\n", $folder, $base );

		$folder_parts = explode('/', $folder);

		$folder_part_keys = array_keys( $folder_parts );

		$last_index = array_pop( $folder_part_keys );

		$last_path = $folder_parts[ $last_index ];

		$files = $this->dirlist( $base );

		foreach ( $folder_parts as $index => $key ) {

			if ( $index == $last_index )

				continue; // We want this to be caught by the next code block.

			// Working from /home/ to /user/ to /wordpress/ see if that file exists within the current folder,

			// If it's found, change into it and follow through looking for it.

			// If it cant find WordPress down that route, it'll continue onto the next folder level, and see if that matches, and so on.

			// If it reaches the end, and still cant find it, it'll return false for the entire function.

			if ( isset($files[ $key ]) ){

				// Lets try that folder:

				$newdir = trailingslashit(path_join($base, $key));

				if ( $this->verbose )

					printf( "\n" . __('Changing to %s') . "<br/>\n", $newdir );

				// only search for the remaining path tokens in the directory, not the full path again

				$newfolder = implode( '/', array_slice( $folder_parts, $index + 1 ) );

				if ( $ret = $this->search_for_folder( $newfolder, $newdir, $loop) )

					return $ret;

			}

		}

		// Only check this as a last resort, to prevent locating the incorrect install. All above procedures will fail quickly if this is the right branch to take.

		if (isset( $files[ $last_path ] ) ) {

			if ( $this->verbose )

				printf( "\n" . __('Found %s') . "<br/>\n",  $base . $last_path );

			return trailingslashit($base . $last_path);

		}

		// Prevent this function from looping again.

		// No need to proceed if we've just searched in /

		if ( $loop || '/' == $base )

			return false;

		// As an extra last resort, Change back to / if the folder wasn't found.

		// This comes into effect when the CWD is /home/user/ but WP is at /var/www/....

		return $this->search_for_folder( $folder, '/', true );

	}

	/**

	 * Return the *nix-style file permissions for a file.

	 *

	 * From the PHP documentation page for fileperms().

	 *

	 * @link http://docs.php.net/fileperms

	 *

	 * @access public

	 * @since 2.5.0

	 *

	 * @param string $file String filename.

	 * @return string The *nix-style representation of permissions.

	 */

	function gethchmod( $file ){

		$perms = $this->getchmod($file);

		if (($perms & 0xC000) == 0xC000) // Socket

			$info = 's';

		elseif (($perms & 0xA000) == 0xA000) // Symbolic Link

			$info = 'l';

		elseif (($perms & 0x8000) == 0x8000) // Regular

			$info = '-';

		elseif (($perms & 0x6000) == 0x6000) // Block special

			$info = 'b';

		elseif (($perms & 0x4000) == 0x4000) // Directory

			$info = 'd';

		elseif (($perms & 0x2000) == 0x2000) // Character special

			$info = 'c';

		elseif (($perms & 0x1000) == 0x1000) // FIFO pipe

			$info = 'p';

		else // Unknown

			$info = 'u';

		// Owner

		$info .= (($perms & 0x0100) ? 'r' : '-');

		$info .= (($perms & 0x0080) ? 'w' : '-');

		$info .= (($perms & 0x0040) ?

					(($perms & 0x0800) ? 's' : 'x' ) :

					(($perms & 0x0800) ? 'S' : '-'));

		// Group

		$info .= (($perms & 0x0020) ? 'r' : '-');

		$info .= (($perms & 0x0010) ? 'w' : '-');

		$info .= (($perms & 0x0008) ?

					(($perms & 0x0400) ? 's' : 'x' ) :

					(($perms & 0x0400) ? 'S' : '-'));

		// World

		$info .= (($perms & 0x0004) ? 'r' : '-');

		$info .= (($perms & 0x0002) ? 'w' : '-');

		$info .= (($perms & 0x0001) ?

					(($perms & 0x0200) ? 't' : 'x' ) :

					(($perms & 0x0200) ? 'T' : '-'));

		return $info;

	}

	/**

	 * Convert *nix-style file permissions to a octal number.

	 *

	 * Converts '-rw-r--r--' to 0644

	 * From "info at rvgate dot nl"'s comment on the PHP documentation for chmod()

 	 *

	 * @link http://docs.php.net/manual/en/function.chmod.php#49614

	 *

	 * @access public

	 * @since 2.5.0

	 *

	 * @param string $mode string The *nix-style file permission.

	 * @return int octal representation

	 */

	function getnumchmodfromh( $mode ) {

		$realmode = '';

		$legal =  array('', 'w', 'r', 'x', '-');

		$attarray = preg_split('//', $mode);

		for ($i=0; $i < count($attarray); $i++)

		   if ($key = array_search($attarray[$i], $legal))

			   $realmode .= $legal[$key];

		$mode = str_pad($realmode, 10, '-', STR_PAD_LEFT);

		$trans = array('-'=>'0', 'r'=>'4', 'w'=>'2', 'x'=>'1');

		$mode = strtr($mode,$trans);

		$newmode = $mode[0];

		$newmode .= $mode[1] + $mode[2] + $mode[3];

		$newmode .= $mode[4] + $mode[5] + $mode[6];

		$newmode .= $mode[7] + $mode[8] + $mode[9];

		return $newmode;

	}

	/**

	 * Determine if the string provided contains binary characters.

	 *

	 * @access private

	 * @since 2.7.0

	 *

	 * @param string $text String to test against.

	 * @return bool true if string is binary, false otherwise.

	 */

	function is_binary( $text ) {

		return (bool) preg_match( '|[^\x20-\x7E]|', $text ); // chr(32)..chr(127)

	}

	/**

	 * Change the ownership of a file / folder.

	 *

	 * Default behavior is to do nothing, override this in your subclass, if desired.

	 *

	 * @since 2.5.0

	 *

	 * @param string $file      Path to the file.

	 * @param mixed  $owner     A user name or number.

	 * @param bool   $recursive Optional. If set True changes file owner recursivly. Defaults to False.

	 * @return bool Returns true on success or false on failure.

	 */

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

		return false;

	}

	/**

	 * Connect filesystem.

	 *

	 * @since 2.5.0

	 *

	 * @return bool True on success or false on failure (always true for WP_Filesystem_Direct).

	 */

	function connect() {

		return true;

	}

	/**

	 * Read entire file into a string.

	 *

	 * @since 2.5.0

	 *

	 * @param string $file Name of the file to read.