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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 legal_file_Core {
private static $photo_types_by_extension;
private static $movie_types_by_extension;
private static $photo_extensions;
private static $movie_extensions;
private static $photo_types;
private static $movie_types;
private static $blacklist = array("php", "php3", "php4", "php5", "phtml", "phtm", "shtml", "shtm",
"pl", "cgi", "asp", "sh", "py", "c", "js");
/**
* Create a default list of allowed photo MIME types paired with their extensions and then let
* modules modify it. This is an ordered map, mapping extensions to their MIME types.
* Extensions cannot be duplicated, but MIMEs can (e.g. jpeg and jpg both map to image/jpeg).
*
* @param string $extension (opt.) - return MIME of extension; if not given, return complete array
*/
static function get_photo_types_by_extension($extension=null) {
if (empty(self::$photo_types_by_extension)) {
$types_by_extension_wrapper = new stdClass();
$types_by_extension_wrapper->types_by_extension = array(
"jpg" => "image/jpeg", "jpeg" => "image/jpeg", "gif" => "image/gif", "png" => "image/png");
module::event("photo_types_by_extension", $types_by_extension_wrapper);
foreach (self::$blacklist as $key) {
unset($types_by_extension_wrapper->types_by_extension[$key]);
}
self::$photo_types_by_extension = $types_by_extension_wrapper->types_by_extension;
}
if ($extension) {
// return matching MIME type
$extension = strtolower($extension);
if (isset(self::$photo_types_by_extension[$extension])) {
return self::$photo_types_by_extension[$extension];
} else {
return null;
}
} else {
// return complete array
return self::$photo_types_by_extension;
}
}
/**
* Create a default list of allowed movie MIME types paired with their extensions and then let
* modules modify it. This is an ordered map, mapping extensions to their MIME types.
* Extensions cannot be duplicated, but MIMEs can (e.g. jpeg and jpg both map to image/jpeg).
*
* @param string $extension (opt.) - return MIME of extension; if not given, return complete array
*/
static function get_movie_types_by_extension($extension=null) {
if (empty(self::$movie_types_by_extension)) {
$types_by_extension_wrapper = new stdClass();
$types_by_extension_wrapper->types_by_extension = array(
"flv" => "video/x-flv", "mp4" => "video/mp4", "m4v" => "video/x-m4v");
module::event("movie_types_by_extension", $types_by_extension_wrapper);
foreach (self::$blacklist as $key) {
unset($types_by_extension_wrapper->types_by_extension[$key]);
}
self::$movie_types_by_extension = $types_by_extension_wrapper->types_by_extension;
}
if ($extension) {
// return matching MIME type
$extension = strtolower($extension);
if (isset(self::$movie_types_by_extension[$extension])) {
return self::$movie_types_by_extension[$extension];
} else {
return null;
}
} else {
// return complete array
return self::$movie_types_by_extension;
}
}
/**
* Create a merged list of all allowed photo and movie MIME types paired with their extensions.
*
* @param string $extension (opt.) - return MIME of extension; if not given, return complete array
*/
static function get_types_by_extension($extension=null) {
$types_by_extension = legal_file::get_photo_types_by_extension();
if (movie::find_ffmpeg()) {
$types_by_extension = array_merge($types_by_extension,
legal_file::get_movie_types_by_extension());
}
if ($extension) {
// return matching MIME type
$extension = strtolower($extension);
if (isset($types_by_extension[$extension])) {
return $types_by_extension[$extension];
} else {
return null;
}
} else {
// return complete array
return $types_by_extension;
}
}
/**
* Create a default list of allowed photo extensions and then let modules modify it.
*
* @param string $extension (opt.) - return true if allowed; if not given, return complete array
*/
static function get_photo_extensions($extension=null) {
if (empty(self::$photo_extensions)) {
$extensions_wrapper = new stdClass();
$extensions_wrapper->extensions = array_keys(legal_file::get_photo_types_by_extension());
module::event("legal_photo_extensions", $extensions_wrapper);
self::$photo_extensions = array_diff($extensions_wrapper->extensions, self::$blacklist);
}
if ($extension) {
// return true if in array, false if not
return in_array(strtolower($extension), self::$photo_extensions);
} else {
// return complete array
return self::$photo_extensions;
}
}
/**
* Create a default list of allowed movie extensions and then let modules modify it.
*
* @param string $extension (opt.) - return true if allowed; if not given, return complete array
*/
static function get_movie_extensions($extension=null) {
if (empty(self::$movie_extensions)) {
$extensions_wrapper = new stdClass();
$extensions_wrapper->extensions = array_keys(legal_file::get_movie_types_by_extension());
module::event("legal_movie_extensions", $extensions_wrapper);
self::$movie_extensions = array_diff($extensions_wrapper->extensions, self::$blacklist);
}
if ($extension) {
// return true if in array, false if not
return in_array(strtolower($extension), self::$movie_extensions);
} else {
// return complete array
return self::$movie_extensions;
}
}
/**
* Create a merged list of all allowed photo and movie extensions.
*
* @param string $extension (opt.) - return true if allowed; if not given, return complete array
*/
static function get_extensions($extension=null) {
$extensions = legal_file::get_photo_extensions();
if (movie::find_ffmpeg()) {
$extensions = array_merge($extensions, legal_file::get_movie_extensions());
}
if ($extension) {
// return true if in array, false if not
return in_array(strtolower($extension), $extensions);
} else {
// return complete array
return $extensions;
}
}
/**
* Create a merged list of all photo and movie filename filters,
* (e.g. "*.gif"), based on allowed extensions.
*/
static function get_filters() {
$filters = array();
foreach (legal_file::get_extensions() as $extension) {
array_push($filters, "*." . $extension, "*." . strtoupper($extension));
}
return $filters;
}
/**
* Create a default list of allowed photo MIME types and then let modules modify it.
* Can be used to add legal alternatives for default MIME types.
* (e.g. flv maps to video/x-flv by default, but video/flv is still legal).
*/
static function get_photo_types() {
if (empty(self::$photo_types)) {
$types_wrapper = new stdClass();
// Need array_unique since types_by_extension can be many-to-one (e.g. jpeg and jpg).
$types_wrapper->types = array_unique(array_values(legal_file::get_photo_types_by_extension()));
module::event("legal_photo_types", $types_wrapper);
self::$photo_types = $types_wrapper->types;
}
return self::$photo_types;
}
/**
* Create a default list of allowed movie MIME types and then let modules modify it.
* Can be used to add legal alternatives for default MIME types.
* (e.g. flv maps to video/x-flv by default, but video/flv is still legal).
*/
static function get_movie_types() {
if (empty(self::$movie_types)) {
$types_wrapper = new stdClass();
// Need array_unique since types_by_extension can be many-to-one (e.g. jpeg and jpg).
$types_wrapper->types = array_unique(array_values(legal_file::get_movie_types_by_extension()));
$types_wrapper->types[] = "video/flv";
module::event("legal_movie_types", $types_wrapper);
self::$movie_types = $types_wrapper->types;
}
return self::$movie_types;
}
/**
* Change the extension of a filename. If the original filename has no
* extension, add the new one to the end.
*/
static function change_extension($filename, $new_ext) {
$filename_no_ext = preg_replace("/\.[^\.\/]*?$/", "", $filename);
return "{$filename_no_ext}.{$new_ext}";
}
/**
* Reduce the given file to having a single extension.
*/
static function smash_extensions($filename) {
if (!$filename) {
// It's harmless, so return it before it causes issues with pathinfo.
return $filename;
}
$parts = pathinfo($filename);
$result = "";
if ($parts["dirname"] != ".") {
$result .= $parts["dirname"] . "/";
}
$parts["filename"] = str_replace(".", "_", $parts["filename"]);
$parts["filename"] = preg_replace("/[_]+/", "_", $parts["filename"]);
$parts["filename"] = trim($parts["filename"], "_");
$result .= isset($parts["extension"]) ? "{$parts['filename']}.{$parts['extension']}" : $parts["filename"];
return $result;
}
}
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