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<?php defined("SYSPATH") or die("No direct script access.");
/**
* Gallery - a web based photo album viewer and editor
* Copyright (C) 2000-2013 Bharat Mediratta
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at
* your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
*/
class system_Core {
private static $files_marked_for_deletion = array();
/**
* Return the path to an executable version of the named binary, or null.
* The paths are traversed in the following order:
* 1. $priority_path (if specified)
* 2. Gallery's own bin directory (DOCROOT . "bin")
* 3. PATH environment variable
* 4. extra_binary_paths Gallery variable (if specified)
* In addition, if the file is found inside Gallery's bin directory but
* it's not executable, we try to change its permissions to 0755.
*
* @param string $binary
* @param string $priority_path (optional)
* @return string path to binary if found; null if not found
*/
static function find_binary($binary, $priority_path=null) {
$bin_path = DOCROOT . "bin";
if ($priority_path) {
$paths = array($priority_path, $bin_path);
} else {
$paths = array($bin_path);
}
$paths = array_merge($paths,
explode(":", getenv("PATH")),
explode(":", module::get_var("gallery", "extra_binary_paths")));
foreach ($paths as $path) {
$path = rtrim($path, "/");
$candidate = "$path/$binary";
// @suppress errors below to avoid open_basedir issues
if (@file_exists($candidate)) {
if (!@is_executable($candidate) &&
(substr_compare($bin_path, $candidate, 0, strlen($bin_path)) == 0)) {
// Binary isn't executable but is in Gallery's bin directory - try fixing permissions.
@chmod($candidate, 0755);
}
if (@is_executable($candidate)) {
return $candidate;
}
}
}
return null;
}
/**
* Create a file with a unique file name.
* This helper is similar to the built-in tempnam.
* It allows the caller to specify a prefix and an extension.
* It always places the file in TMPPATH.
* Unless specified with the $delete_later argument, it will be marked
* for deletion at shutdown using system::delete_later.
*/
static function temp_filename($prefix="", $extension="", $delete_later=true) {
do {
$basename = tempnam(TMPPATH, $prefix);
if (!$basename) {
return false;
}
$filename = "$basename.$extension";
$success = !file_exists($filename) && @rename($basename, $filename);
if (!$success) {
@unlink($basename);
}
} while (!$success);
if ($delete_later) {
system::delete_later($filename);
}
return $filename;
}
/**
* Mark a file for deletion at shutdown time. This is useful for temp files, where we can delay
* the deletion time until shutdown to keep page load time quick.
*/
static function delete_later($filename) {
self::$files_marked_for_deletion[] = $filename;
}
/**
* Delete all files marked using system::delete_later. This is called at gallery shutdown.
*/
static function delete_marked_files() {
foreach (self::$files_marked_for_deletion as $filename) {
// We want to suppress all errors, as it's possible that some of these
// files may have been deleted/moved before we got here.
@unlink($filename);
}
}
}
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