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