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Diffstat (limited to 'modules/gallery/helpers/system.php')
| -rw-r--r-- | modules/gallery/helpers/system.php | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/modules/gallery/helpers/system.php b/modules/gallery/helpers/system.php new file mode 100644 index 0000000..f0879d6 --- /dev/null +++ b/modules/gallery/helpers/system.php @@ -0,0 +1,113 @@ +<?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); + } + } +} |