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egroupware_official/phpgwapi/inc/class.egw_find_iterator.inc.php

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<?php
/**
* eGroupWare API: Find Iterator - classes to iterate over large directory trees
* This is a rewrite of the original egw_vfs::find function, original author
* Ralf Becker <RalfBecker-AT-outdoor-training.de>
*
* @link http://www.egroupware.org
* @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
* @package api
* @subpackage vfs
* @author Andreas Stoeckel
* @copyright (c) 2010 by Andreas Stoeckel
* @version $Id$
*/
define("FILTER_NOFOLLOW", 2); //Display the element but do not follow
define("FILTER_OK", 1); //The filter has passed
define("FILTER_DISPLAY", -1); //The element filtered should not be returned to the caller of find, it should not be displayed
define("FILTER_ALL", -2); //The element didn't pass the filter
function translate_path($path, $isurl) {
return $isurl ? $path : egw_vfs::PREFIX.parse_url($path, PHP_URL_PATH);
}
class egw_find_file
{
private $isurl = false;
private $need_mime = false;
private $base_path = "";
private $stat = null;
private $mime = null;
private $props = null;
private $result = null;
public $filename = ''; //< The filename including the file path, e.g. /home/user/example.file
public $path = ''; //< The filename, e.g. example.file
public $name = ''; //< The file path, e.g. /home/user/
public $isdot = false;
public $filterstate = FILTER_ALL;
public function __construct($path, $isurl, $need_mime)
{
//Copy the given parameters
$this->isurl = $isurl;
$this->need_mime = $need_mime;
$this->pair_result = $pair_result;
$this->base_path = $path;
//Set filename, path and path + name as this information will most likely
//be needed
$paths = $this->isurl ? explode('/', $path) : explode('/', parse_url($path, PHP_URL_PATH));
$this->name = implode('/',$paths);
$this->filename = array_pop($paths);
$this->path = implode('/',$paths).'/';
$this->is_dot = ($this->filename == '.') || ($this->filename == '..');
}
public function get_stat()
{
//Check whether the stat data has already been created, if not, create it
if ($this->stat === null)
{
$this->stat = $this->isurl ? lstat($this->base_path) :
egw_vfs::url_stat($this->base_path, STREAM_URL_STAT_LINK);
//Remove numerical indices 0-12
$this->stat = array_slice($this->stat, 13);
};
return $this->stat;
}
public function get_mime()
{
//Check if the mime data has already been read, if not, read it
if ($this->mime === null)
$res['mime'] = egw_vfs::mime_content_type($this->base_path);
return $this->mime;
}
public function get_props()
{
//Check whether props has already been read, if not, read it
if ($this->props === null)
{
$this->props = array(
"isfile" => is_file($this->base_path),
"isdir" => is_dir($this->base_path),
"islink" => is_link($this->base_path),
);
if ($this->props['islink'])
$this->props['linktarget'] = readlink($this->base_path);
}
return $this->props;
}
public function get_result($pair_result)
{
//Check whether the result has already been produced, if not, produce it
if ($this->result === null)
{
//Check whether only the file name/path should be returned or the complete
//resultset
if ($pair_result)
{
//Copy the state and add some custom information
$this->result = $this->get_stat();
$this->result['path'] = $this->name;
$this->result['name'] = $this->filename;
if ($this->need_mime)
$this->result['mime'] = $this->get_mime();
}
else
{
$this->result = $this->name;
}
}
return $this->result;
}
public function translate_path()
{
return translate_path($this->name, $this->isurl);
}
}
/*
* egw_directory_iterator_filter filters files based on the options set supplied during
* construction. It is used by the RecursiveDirectoryIteratorWrapper and
* FindIterator classes. Filtering is performed by calling the "filter" function
* and passing an url_state array.
*/
class egw_directory_iterator_filter
{
//Parsed options
private $hidden = false;
private $type = null;
private $name_preg = null;
private $path_preg = null;
private $curkey = 0;
private $lcur = null;
private $uid = null;
private $gid = null;
private $ctime = null;
private $mtime = null;
private $cmin = null;
private $mmin = null;
private $size = null;
private $empty = true;
private $follow = false;
private $mime = null;
/*
* check_num is internally used to compare strings/numerical values.
* @param(value is an integer parameter)
* @param(argument may be a string or an integer. If argument is an integer
* the result gets true if argument equals value. If argument is a string, the
* first char, which may be '+' or '-' defines whether the result gets true if
* value is greater than argument (+) or when it is smaller than argument (-))
*/
private static function check_num($value, $argument)
{
if (is_int($argument) && $argument >= 0 || $argument[0] != '-' && $argument[0] != '+')
return $value == $argument;
if ($argument < 0)
return $value < abs($argument);
return $value > (int) substr($argument,1);
}
public function __construct($options)
{
//Preprocess the parameters
$this->hidden = isset($options['hidden']) ? $options['hidden'] : false;
$this->type = isset($options['type']) ? $options['type'] : null;
$this->name_preg = isset($options['name_preg']) ? $options['name_preg'] : null;
$this->path_preg = isset($options['path_preg']) ? $options['path_preg'] : null;
$this->cmin = isset($options['cmin']) ? $options['cmin'] : null;
$this->mmin = isset($options['mmin']) ? $options['mmin'] : null;
$this->ctime = isset($options['ctime']) ? $options['ctime'] : null;
$this->mtime = isset($options['mtime']) ? $options['mtime'] : null;
$this->empty = isset($options['empty']) ? $options['empty'] : true;
$this->size = isset($options['size']) ? $options['size'] : null;
$this->follow = isset($options['follow']) ? $options['follow'] : false;
$this->mime = isset($options['mime']) ? $options['mime'] : null;
//Convert the (probably) given path/name filters to regular expressions
if (isset($options['name']) && !isset($options['name_preg'])) // change from simple *,? wildcards to preg regular expression once
$this->name_preg = '/^'.str_replace(array('\\?','\\*'),
array('.{1}','.*'), preg_quote($options['name'])).'$/i';
if (isset($options['path']) && !isset($options['preg_path'])) // change from simple *,? wildcards to preg regular expression once
$this->path_preg = '/^'.str_replace(array('\\?','\\*'),
array('.{1}','.*'), preg_quote($options['path'])).'$/i';
//Translate username to uid
if (!isset($options['uid']))
{
if (isset($options['user']))
{
$this->uid = $GLOBALS['egw']->accounts->name2id($options['user'],'account_lid','u');
}
elseif (isset($options['nouser']))
{
$this->uid = 0;
}
}
else
{
$this->uid = $options['uid'];
}
//Translate groupid to gid
if (!isset($options['gid']))
{
if (isset($options['group']))
{
$this->gid = abs($GLOBALS['egw']->accounts->name2id($options['group'],'account_lid','g'));
}
elseif (isset($options['nogroup']))
{
$this->gid = 0;
}
}
else
{
$this->gid = $options['group'];
}
}
public function filter($findfile)
{
if ($findfile)
{
//Exclude directory and parent directory
if ($findfile->isdot)
return FILTER_ALL;
//Exclude hidden files
if (!$this->hidden && (($findfile->filename[0] == '.') || ($findfile->filename == 'Thumbs.db')))
return FILTER_ALL;
//Read the file properties (like (is link etc.))
$props = $findfile->get_props();
//If this is a directory, we probably need to keep this entry to crawl
//for files inside this directory. That's what FILTER_DISPLAY is for
if ($props['isdir'] && (!($props['islink']) || $this->follow))
$dir_filter = FILTER_DISPLAY;
else
$dir_filter = FILTER_ALL;
//Exclude files/directories based on the given regular expression
if ($this->name_preg && !preg_match($this->name_preg, $findfile->filename) ||
$this->path_preg && !preg_match($this->path_preg, $findfile->path))
return $dir_filter;
//Exclude directories/symlinks/files
if ($this->type && ($this->type == 'd') == !($props['isdir'] && !$props['islink']) ||
(($this->type == 'F') && ($props['isdir'] || $props['islink'])))
return $dir_filter;
if (($this->cmin !== null) || ($this->mmin !== null) ||
($this->ctime !== null) || ($this->mtime !== null) ||
($this->size !== null) || (!$this->empty) ||
($this->gid !== null) || ($this->uid !== null))
{
//Check user/group
if (($this->gid !== null) && $stat['gid'] != $options['gid'] ||
($this->uid !== null) && $stat['uid'] != $options['uid'])
{
return FILTER_ALL; // wrong user or group
}
//Retrieve the file stat
$stat = $this->get_stat();
//Excludes files where the creation/last modification timestamps is greater than
//the given time
if ($this->cmin && !self::check_num(round((time()-$stat['ctime'])/60), $this->cmin) ||
$this->mmin && !self::check_num(round((time()-$stat['mtime'])/60), $this->mmin) ||
$this->ctime && !self::check_num(round((time()-$stat['ctime'])/86400), $this->ctime) ||
$this->mtime && !self::check_num(round((time()-$stat['mtime'])/86400), $this->mtime))
{
return $dir_filter;
}
//Check filesize
if (($this->size !== null) && !self::check_num($stat['size'], $this->size) ||
(!$this->empty && $stat['size'] <= 0)) //TODO Check this
{
return $dir_filter;
}
}
//Check the mime type and subtype. As loading the mime type takes the
//longest time, it is postponed as long as possible
if ($this->mime !== null) {
$mime = $findfile->get_mime();
if ($options['mime'] != $mime)
{
list($type, $subtype) = explode('/', $this->mime);
// no subtype (eg. 'image') --> check only the main type
if ($sub_type || substr($this->mime, 0, strlen($type)+1) != $type.'/')
return $dir_filter; // wrong mime-type
}
}
//Return FILTER_OK, if the filters have passed
return FILTER_OK;
}
else
{
return FILTER_ALL;
}
}
}
class egw_recursive_directory_iterator_wrapper implements RecursiveIterator
{
private $base = "";
private $exec = null;
private $exec_params = null;
private $filter = null;
private $elements = null;
private $index = 0;
private $iterator = null;
private $follow = false;
private $sortfunc;
private $sort = false;
private $url = false;
private $needmime = false;
private function fillelemarray()
{
//Fill the "elements" array with all filestates
$this->elements = array();
//Loop through each element of the recursive directory iterator
foreach($this->iterator as $key => $value)
{
//Create a new egw_find_file class for each entry and filter it
$findfile = new egw_find_file(
$this->iterator->getPath().'/'.$this->iterator->getFilename(),
$this->url, $this->needmime);
//Filter the element
$filterresult = $this->filter->filter($findfile);
if ($filterresult >= FILTER_DISPLAY)
{
$findfile->filterstate = $filterresult;
$this->elements[] = $findfile;
}
}
//Sort the elements
if ($this->sort)
{
usort($this->elements, $this->sortfunc);
}
}
public function __construct($iterator, &$filter, $follow, $url, $needmime,
$sort, $sortfunc)
{
$this->filter = $filter;
$this->iterator = $iterator;
if ($this->iterator->valid())
{
$this->base = $this->iterator->getPath();
}
$this->follow = $follow;
$this->sortfunc = $sortfunc;
$this->sort = $sort;
$this->url = $url;
$this->needmime = $needmime;
//Get the element array. As this array only contains the current directory,
//and subdirectories are first loaded when they are accessed, a lot of memory
//is saved.
$this->fillelemarray();
}
public function valid()
{
return $this->index < count($this->elements);
}
public function next()
{
$this->index++;
}
public function current()
{
return $this->elements[$this->index];
}
public function key()
{
return $this->elements[$this->index]['name'];
}
public function hasChildren()
{
$props = &$this->elements[$this->index]->get_props();
//Only follow symlinks if we were ought to do so
if ($props['isdir'] && !$props['isdot'] && (!$props['islink'] || $this->follow))
{
//Check whether the link points on a file
if ($props['islink'])
{
$info = new SplFileInfo($props['linktarget']);
//Only follow the symlink if the symlink points to a directory.
//TODO: Recursion prevention?
return ($info->isDir());
}
else
{
return true;
}
}
return false;
}
public function getChildren()
{
$it = new RecursiveDirectoryIterator($this->elements[$this->index]->translate_path());
return new egw_recursive_directory_iterator_wrapper($it, $this->filter,
$this->follow, $this->url, $this->needmime, $this->sort,
$this->sortfunc, false);
}
public function rewind()
{
$this->index = 0;
}
}
class egw_find_iterator implements Iterator
{
private $filter = null;
private $follow = false;
private $iterator_stack = array();
private $base = array();
private $base_index = 0;
private $current_cache = null;
private $needs_next = false;
private $rewind = false;
private $pairs = false;
private $numerical_sort = false;
private $dirsontop = true;
private $sort = 1;
private $order = null;
private $index = 0;
private $lower_limit = 0;
private $upper_limit = null;
private $mindepth = null;
private $maxdepth = null;
private $depth = false;
private $url = false;
private $needmime = false;
private function push_root_iterator()
{
$root_iterator = new egw_recursive_directory_iterator_wrapper(
new RecursiveDirectoryIterator($this->base[$this->base_index]),
$this->filter, $this->follow, $this->url, $this->needmime,
($this->order !== null) || $this->dirsontop, array($this, "sort"), true);
array_push($this->iterator_stack, $root_iterator);
}
public function sort($a, $b)
{
//TODO restore, make it much faster :-)
/*if ($this->dirsontop)
{
if (($a['isdir'] != $b['isdir']) && ($a['isdir'] || $b['isdir']))
return $a['isdir'] ? -1:1;
}
if ($this->numerical_sort)
{
$res = $a[$this->order] == $b[$this->order] ? 0 : ($a[$this->order] > $b[$this->order] ? -1:1);
}
else
{
$res = strcasecmp($a[$this->order], $b[$this->order]);
}
//Always use name as second sort criteria
if (($res == 0) && ($this->order != 'name'))
{
$res = strcasecmp($a['name'], $b['name']);
}*/
return 0; //$res * $this->sort;
}
private function cur_iterator()
{
$s = count($this->iterator_stack);
if ($s > 0)
{
return $this->iterator_stack[$s - 1];
}
else
{
return null;
}
}
private function output_directory(&$findfile)
{
//If the element is visible, set $current_cache properly and return
if ($findfile->filterstate >= FILTER_OK)
{
$this->index++;
if (($this->index-1 >= $this->lower_limit) &&
(($this->mindepth === null) || count($this->iterator_stack) >= $this->mindepth))
{
$this->current_cache = $findfile->get_result($this->pairs);
return true;
}
}
return false;
}
private function prefetch_current()
{
//If needs_next is true, a new element has been requested by calling the
//"next()" function
if ($this->needs_next)
{
//Reset $current_cache
$this->needs_next = false;
$this->current_cache = null;
$this->rewind = false;
$cur = $this->cur_iterator();
while (($cur != null) && (!$this->upper_limit || ($this->index <= $this->upper_limit)))
{
$skip = false;
if ($cur->valid())
{
//Get a copy of the current file state
$findfile = $cur->current();
//Add the children elements, if some exist
if ($cur->hasChildren() && !($findfile->filterstate == FILTER_NOFOLLOW))
{
if (($this->maxdepth === null) || count($this->iterator_stack) < $this->maxdepth)
{
array_push($this->iterator_stack, $cur->getChildren());
$skip = $this->depth;
}
}
//Step the current element one further and get the (probably) new iterator
if (!$skip)
$cur->next();
$cur = $this->cur_iterator();
if (!$skip && $this->output_directory($findfile))
break;
}
//If the current iterator doesn't contain any valid element, we're at the
//end of the current directory. Switch to the last directory
if (!$cur->valid())
{
array_pop($this->iterator_stack);
$cur = $this->cur_iterator();
//If cur = null we're at the end of the current directory tree.
//Check whether there was another directory specified
if ($cur === null)
{
//Increment the base dir array index
$this->base_index++;
if ($this->base_index < count($this->base))
{
$this->push_root_iterator();
$cur = $this->cur_iterator();
}
}
else
{
//If the contents of the directory were listed before the directory itself
//output the directory name when it was popped from the iterator stack
if ($this->depth && $cur && $cur->valid())
{
$findfile = $cur->current();
$cur->next();
if ($this->output_directory($findfile))
break;
}
}
}
}
}
}
private function parseoptions(&$options)
{
//If options is not set, make it an empty array
if (!$options)
$options = array();
//Create the filter object (passed to other objects by reference) and
//parse some other options relevant for this base class
$this->filter = new egw_directory_iterator_filter($options);
$this->follow = isset($options['follow']) ? $options['follow'] : false;
$this->mindepth = isset($options['mindepth']) ? $options['mindepth'] : null;
$this->maxdepth = isset($options['maxdepth']) ? $options['maxdepth'] : null;
$this->depth = isset($options['depth']) ? $options['depth'] : false;
$this->dirsontop = isset($options['dirsontop']) ? (boolean)$options['dirsontop'] :
(isset($options['maxdepth']) && $options['maxdepth']>0);
$this->sort = isset($options['sort']) ? (($options['sort'] == 'ASC') ? 1 : -1) : 1;
$this->order = isset($options['order']) ? $options['order'] : null;
$this->numerical_sort = ($this->order == 'size' || $this->order == 'uid' ||
$this->order == 'gid' || $this->order == 'mode' || $this->order == 'ctime' ||
$this->order == 'mtime');
$this->url = isset($options['url']) ? (boolean)$options['url'] : false;
$this->needmime = isset($options['need_mime']) ? $options['need_mime'] : false;
$this->needmime = $this->needmime || isset($options['mime']) || ($this->order == 'mime');
//Retrieve the limit parameters
if (isset($options['limit']))
{
$args = explode(',', $options['limit']);
$count = $args[0];
if (isset($args[1]))
{
$this->lower_limit = $args[1];
}
$this->upper_limit = $this->lower_limit + $count;
}
}
public function __construct($base, $options=null, $pairs = false)
{
//_debug_array($options);
$this->pairs = $pairs;
$this->parseoptions($options);
//Make sure that base is an array with numeric keys
if (is_array($base))
{
$this->base = array_values($base);
}
else
{
$this->base[] = $base;
}
//Add the default url prefix to every path if url is not set.
foreach($this->base as $key => $path)
$this->base[$key] = translate_path($path, $this->url);
$this->rewind();
}
public function current()
{
$this->prefetch_current();
return $this->current_cache;
}
public function key()
{
$this->prefetch_current();
if ($this->pairs)
{
return $this->current_cache->path;
}
else
{
return $this->index - 1 - $this->lower_limit;
}
}
public function next()
{
$this->needs_next = true;
$this->prefetch_current();
}
public function valid()
{
if (!$this->upper_limit || ($this->index <= $this->upper_limit))
{
$this->prefetch_current();
return $this->current_cache != null;
}
else
{
return false;
}
}
public function rewind()
{
if (!$this->rewind)
{
//Empty the iterator stack
$this->iterator_stack = array();
$this->current_cache = null;
$this->needs_next = true;
$this->index = 0;
$this->base_index = 0;
$this->rewind = true;
//Create the root directory iterator
$this->push_root_iterator();
}
}
}