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<?php
/* vim:set softtabstop=4 shiftwidth=4 expandtab: */
/**
*
* LICENSE: GNU General Public License, version 2 (GPLv2)
* Copyright 2001 - 2013 Ampache.org
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License v2
* as published by the Free Software Foundation.
*
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
*/
/**
* Core Class
*
* This is really just a namespace class, it's full of static functions
* would be replaced by a namespace library once that exists in php
*
*/
class Core {
/**
* constructor
* This doesn't do anything
*/
private function __construct() {
return false;
} // construction
/**
* autoload
*
* This function automatically loads any missing classes as they are
* needed so that we don't use a million include statements which load
* more than we need.
*/
public static function autoload($class) {
$file = Config::get('prefix') . '/lib/class/' .
strtolower($class) . '.class.php';
if (Core::is_readable($file)) {
require_once $file;
// Call _auto_init if it exists
$autocall = array($class, '_auto_init');
if (is_callable($autocall)) {
call_user_func($autocall);
}
}
else {
debug_event('autoload', "'$class' not found!", 1);
}
}
/**
* form_register
* This registers a form with a SID, inserts it into the session
* variables and then returns a string for use in the HTML form
*/
public static function form_register($name, $type = 'post') {
// Make ourselves a nice little sid
$sid = md5(uniqid(rand(), true));
$window = Config::get('session_length');
$expire = time() + $window;
// Register it
$_SESSION['forms'][$sid] = array('name' => $name, 'expire' => $expire);
debug_event('Core', "Registered $type form $name with SID $sid and expiration $expire ($window seconds from now)", 5);
switch ($type) {
default:
case 'post':
$string = '<input type="hidden" name="form_validation" value="' . $sid . '" />';
break;
case 'get':
$string = $sid;
break;
} // end switch on type
return $string;
} // form_register
/**
* form_verify
*
* This takes a form name and then compares it with the posted sid, if
* they don't match then it returns false and doesn't let the person
* continue
*/
public static function form_verify($name, $type = 'post') {
switch ($type) {
case 'post':
$sid = $_POST['form_validation'];
break;
case 'get':
$sid = $_GET['form_validation'];
break;
case 'cookie':
$sid = $_COOKIE['form_validation'];
break;
case 'request':
$sid = $_REQUEST['form_validation'];
break;
}
if (!isset($_SESSION['forms'][$sid])) {
debug_event('Core', "Form $sid not found in session, rejecting request", 2);
return false;
}
$form = $_SESSION['forms'][$sid];
unset($_SESSION['forms'][$sid]);
if ($form['name'] == $name) {
debug_event('Core', "Verified SID $sid for $type form $name", 5);
if ($form['expire'] < time()) {
debug_event('Core', "Form $sid is expired, rejecting request", 2);
return false;
}
return true;
}
// OMG HAX0RZ
debug_event('Core', "$type form $sid failed consistency check, rejecting request", 2);
return false;
} // form_verify
/**
* image_dimensions
* This returns the dimensions of the passed song of the passed type
* returns an empty array if PHP-GD is not currently installed, returns
* false on error
*/
public static function image_dimensions($image_data) {
if (!function_exists('ImageCreateFromString')) { return false; }
$image = ImageCreateFromString($image_data);
if (!$image) { return false; }
$width = imagesx($image);
$height = imagesy($image);
if (!$width || !$height) { return false; }
return array('width'=>$width,'height'=>$height);
} // image_dimensions
/*
* is_readable
*
* Replacement function because PHP's is_readable is buggy:
* https://bugs.php.net/bug.php?id=49620
*/
public static function is_readable($path) {
if (is_dir($path)) {
$handle = opendir($path);
if ($handle === false) {
return false;
}
closedir($handle);
return true;
}
$handle = fopen($path, 'rb');
if ($handle === false) {
return false;
}
fclose($handle);
return true;
}
} // Core
?>
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