850 lines
21 KiB
PHP
850 lines
21 KiB
PHP
<?php
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/**
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* CodeIgniter
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*
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* An open source application development framework for PHP
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*
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* This content is released under the MIT License (MIT)
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*
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* Copyright (c) 2014 - 2019, British Columbia Institute of Technology
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*
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* @package CodeIgniter
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* @author EllisLab Dev Team
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* @copyright Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)
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* @copyright Copyright (c) 2014 - 2019, British Columbia Institute of Technology (https://bcit.ca/)
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* @license https://opensource.org/licenses/MIT MIT License
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* @link https://codeigniter.com
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* @since Version 1.0.0
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* @filesource
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*/
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defined('BASEPATH') OR exit('No direct script access allowed');
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/**
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* Common Functions
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*
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* Loads the base classes and executes the request.
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*
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* @package CodeIgniter
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* @subpackage CodeIgniter
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* @category Common Functions
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* @author EllisLab Dev Team
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* @link https://codeigniter.com/user_guide/
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*/
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// ------------------------------------------------------------------------
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if ( ! function_exists('is_php'))
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{
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/**
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* Determines if the current version of PHP is equal to or greater than the supplied value
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*
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* @param string
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* @return bool TRUE if the current version is $version or higher
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*/
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function is_php($version)
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{
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static $_is_php;
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$version = (string) $version;
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if ( ! isset($_is_php[$version]))
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{
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$_is_php[$version] = version_compare(PHP_VERSION, $version, '>=');
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}
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return $_is_php[$version];
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}
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}
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// ------------------------------------------------------------------------
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if ( ! function_exists('is_really_writable'))
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{
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/**
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* Tests for file writability
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*
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* is_writable() returns TRUE on Windows servers when you really can't write to
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* the file, based on the read-only attribute. is_writable() is also unreliable
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* on Unix servers if safe_mode is on.
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*
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* @link https://bugs.php.net/bug.php?id=54709
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* @param string
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* @return bool
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*/
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function is_really_writable($file)
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{
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// If we're on a Unix server with safe_mode off we call is_writable
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if (DIRECTORY_SEPARATOR === '/' && (is_php('5.4') OR ! ini_get('safe_mode')))
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{
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return is_writable($file);
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}
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/* For Windows servers and safe_mode "on" installations we'll actually
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* write a file then read it. Bah...
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*/
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if (is_dir($file))
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{
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$file = rtrim($file, '/').'/'.md5(mt_rand());
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if (($fp = @fopen($file, 'ab')) === FALSE)
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{
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return FALSE;
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}
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fclose($fp);
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@chmod($file, 0777);
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@unlink($file);
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return TRUE;
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}
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elseif ( ! is_file($file) OR ($fp = @fopen($file, 'ab')) === FALSE)
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{
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return FALSE;
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}
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fclose($fp);
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return TRUE;
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}
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}
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// ------------------------------------------------------------------------
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if ( ! function_exists('load_class'))
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{
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/**
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* Class registry
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*
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* This function acts as a singleton. If the requested class does not
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* exist it is instantiated and set to a static variable. If it has
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* previously been instantiated the variable is returned.
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*
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* @param string the class name being requested
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* @param string the directory where the class should be found
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* @param mixed an optional argument to pass to the class constructor
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* @return object
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*/
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function &load_class($class, $directory = 'libraries', $param = NULL)
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{
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static $_classes = array();
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// Does the class exist? If so, we're done...
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if (isset($_classes[$class]))
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{
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return $_classes[$class];
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}
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$name = FALSE;
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// Look for the class first in the local application/libraries folder
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// then in the native system/libraries folder
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foreach (array(APPPATH, BASEPATH) as $path)
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{
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if (file_exists($path.$directory.'/'.$class.'.php'))
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{
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$name = 'CI_'.$class;
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if (class_exists($name, FALSE) === FALSE)
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{
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require_once($path.$directory.'/'.$class.'.php');
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}
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break;
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}
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}
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// Is the request a class extension? If so we load it too
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if (file_exists(APPPATH.$directory.'/'.config_item('subclass_prefix').$class.'.php'))
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{
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$name = config_item('subclass_prefix').$class;
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if (class_exists($name, FALSE) === FALSE)
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{
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require_once(APPPATH.$directory.'/'.$name.'.php');
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}
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}
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// Did we find the class?
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if ($name === FALSE)
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{
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// Note: We use exit() rather than show_error() in order to avoid a
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// self-referencing loop with the Exceptions class
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set_status_header(503);
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echo 'Unable to locate the specified class: '.$class.'.php';
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exit(5); // EXIT_UNK_CLASS
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}
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// Keep track of what we just loaded
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is_loaded($class);
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$_classes[$class] = isset($param)
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? new $name($param)
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: new $name();
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return $_classes[$class];
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}
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}
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// --------------------------------------------------------------------
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if ( ! function_exists('is_loaded'))
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{
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/**
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* Keeps track of which libraries have been loaded. This function is
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* called by the load_class() function above
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*
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* @param string
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* @return array
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*/
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function &is_loaded($class = '')
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{
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static $_is_loaded = array();
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if ($class !== '')
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{
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$_is_loaded[strtolower($class)] = $class;
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}
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return $_is_loaded;
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}
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}
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// ------------------------------------------------------------------------
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if ( ! function_exists('get_config'))
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{
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/**
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* Loads the main config.php file
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*
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* This function lets us grab the config file even if the Config class
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* hasn't been instantiated yet
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*
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* @param array
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* @return array
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*/
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function &get_config(Array $replace = array())
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{
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static $config;
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if (empty($config))
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{
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$file_path = APPPATH.'config/config.php';
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$found = FALSE;
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if (file_exists($file_path))
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{
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$found = TRUE;
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require($file_path);
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}
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// Is the config file in the environment folder?
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if (file_exists($file_path = APPPATH.'config/'.ENVIRONMENT.'/config.php'))
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{
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require($file_path);
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}
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elseif ( ! $found)
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{
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set_status_header(503);
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echo 'The configuration file does not exist.';
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exit(3); // EXIT_CONFIG
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}
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// Does the $config array exist in the file?
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if ( ! isset($config) OR ! is_array($config))
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{
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set_status_header(503);
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echo 'Your config file does not appear to be formatted correctly.';
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exit(3); // EXIT_CONFIG
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}
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}
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// Are any values being dynamically added or replaced?
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foreach ($replace as $key => $val)
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{
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$config[$key] = $val;
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}
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return $config;
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}
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}
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// ------------------------------------------------------------------------
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if ( ! function_exists('config_item'))
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{
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/**
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* Returns the specified config item
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*
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* @param string
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* @return mixed
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*/
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function config_item($item)
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{
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static $_config;
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if (empty($_config))
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{
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// references cannot be directly assigned to static variables, so we use an array
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$_config[0] =& get_config();
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}
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return isset($_config[0][$item]) ? $_config[0][$item] : NULL;
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}
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}
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// ------------------------------------------------------------------------
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if ( ! function_exists('get_mimes'))
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{
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/**
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* Returns the MIME types array from config/mimes.php
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*
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* @return array
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*/
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function &get_mimes()
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{
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static $_mimes;
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if (empty($_mimes))
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{
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$_mimes = file_exists(APPPATH.'config/mimes.php')
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? include(APPPATH.'config/mimes.php')
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: array();
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if (file_exists(APPPATH.'config/'.ENVIRONMENT.'/mimes.php'))
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{
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$_mimes = array_merge($_mimes, include(APPPATH.'config/'.ENVIRONMENT.'/mimes.php'));
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}
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}
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return $_mimes;
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}
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}
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// ------------------------------------------------------------------------
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if ( ! function_exists('is_https'))
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{
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/**
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* Is HTTPS?
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*
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* Determines if the application is accessed via an encrypted
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* (HTTPS) connection.
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*
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* @return bool
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*/
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function is_https()
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{
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if ( ! empty($_SERVER['HTTPS']) && strtolower($_SERVER['HTTPS']) !== 'off')
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{
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return TRUE;
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}
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elseif (isset($_SERVER['HTTP_X_FORWARDED_PROTO']) && strtolower($_SERVER['HTTP_X_FORWARDED_PROTO']) === 'https')
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{
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return TRUE;
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}
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elseif ( ! empty($_SERVER['HTTP_FRONT_END_HTTPS']) && strtolower($_SERVER['HTTP_FRONT_END_HTTPS']) !== 'off')
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{
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return TRUE;
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}
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return FALSE;
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}
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}
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// ------------------------------------------------------------------------
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if ( ! function_exists('is_cli'))
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{
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/**
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* Is CLI?
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*
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* Test to see if a request was made from the command line.
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*
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* @return bool
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*/
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function is_cli()
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{
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return (PHP_SAPI === 'cli' OR defined('STDIN'));
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}
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}
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// ------------------------------------------------------------------------
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if ( ! function_exists('show_error'))
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{
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/**
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* Error Handler
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*
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* This function lets us invoke the exception class and
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* display errors using the standard error template located
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* in application/views/errors/error_general.php
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* This function will send the error page directly to the
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* browser and exit.
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*
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* @param string
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* @param int
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* @param string
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* @return void
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*/
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function show_error($message, $status_code = 500, $heading = 'An Error Was Encountered')
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{
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$status_code = abs($status_code);
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if ($status_code < 100)
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{
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$exit_status = $status_code + 9; // 9 is EXIT__AUTO_MIN
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$status_code = 500;
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}
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else
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{
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$exit_status = 1; // EXIT_ERROR
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}
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$_error =& load_class('Exceptions', 'core');
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echo $_error->show_error($heading, $message, 'error_general', $status_code);
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exit($exit_status);
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}
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}
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// ------------------------------------------------------------------------
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if ( ! function_exists('show_404'))
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{
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/**
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* 404 Page Handler
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*
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* This function is similar to the show_error() function above
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* However, instead of the standard error template it displays
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* 404 errors.
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*
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* @param string
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* @param bool
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* @return void
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*/
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function show_404($page = '', $log_error = TRUE)
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{
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$_error =& load_class('Exceptions', 'core');
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$_error->show_404($page, $log_error);
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exit(4); // EXIT_UNKNOWN_FILE
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}
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}
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// ------------------------------------------------------------------------
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if ( ! function_exists('log_message'))
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{
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/**
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* Error Logging Interface
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*
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* We use this as a simple mechanism to access the logging
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* class and send messages to be logged.
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*
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* @param string the error level: 'error', 'debug' or 'info'
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* @param string the error message
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* @return void
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*/
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function log_message($level, $message)
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{
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static $_log;
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if ($_log === NULL)
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{
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// references cannot be directly assigned to static variables, so we use an array
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$_log[0] =& load_class('Log', 'core');
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}
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$_log[0]->write_log($level, $message);
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}
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}
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// ------------------------------------------------------------------------
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if ( ! function_exists('set_status_header'))
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{
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/**
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* Set HTTP Status Header
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*
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* @param int the status code
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* @param string
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* @return void
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*/
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function set_status_header($code = 200, $text = '')
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{
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if (is_cli())
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{
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return;
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}
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if (empty($code) OR ! is_numeric($code))
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{
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show_error('Status codes must be numeric', 500);
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}
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if (empty($text))
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{
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is_int($code) OR $code = (int) $code;
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$stati = array(
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100 => 'Continue',
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101 => 'Switching Protocols',
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200 => 'OK',
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201 => 'Created',
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202 => 'Accepted',
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203 => 'Non-Authoritative Information',
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204 => 'No Content',
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205 => 'Reset Content',
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206 => 'Partial Content',
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300 => 'Multiple Choices',
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301 => 'Moved Permanently',
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302 => 'Found',
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303 => 'See Other',
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304 => 'Not Modified',
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305 => 'Use Proxy',
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307 => 'Temporary Redirect',
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400 => 'Bad Request',
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401 => 'Unauthorized',
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402 => 'Payment Required',
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403 => 'Forbidden',
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404 => 'Not Found',
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405 => 'Method Not Allowed',
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406 => 'Not Acceptable',
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407 => 'Proxy Authentication Required',
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408 => 'Request Timeout',
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409 => 'Conflict',
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410 => 'Gone',
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411 => 'Length Required',
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412 => 'Precondition Failed',
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413 => 'Request Entity Too Large',
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414 => 'Request-URI Too Long',
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415 => 'Unsupported Media Type',
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416 => 'Requested Range Not Satisfiable',
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417 => 'Expectation Failed',
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422 => 'Unprocessable Entity',
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426 => 'Upgrade Required',
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428 => 'Precondition Required',
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429 => 'Too Many Requests',
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431 => 'Request Header Fields Too Large',
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500 => 'Internal Server Error',
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501 => 'Not Implemented',
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502 => 'Bad Gateway',
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503 => 'Service Unavailable',
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504 => 'Gateway Timeout',
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505 => 'HTTP Version Not Supported',
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511 => 'Network Authentication Required',
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);
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if (isset($stati[$code]))
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{
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$text = $stati[$code];
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}
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else
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{
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show_error('No status text available. Please check your status code number or supply your own message text.', 500);
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}
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}
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if (strpos(PHP_SAPI, 'cgi') === 0)
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{
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header('Status: '.$code.' '.$text, TRUE);
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return;
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}
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$server_protocol = (isset($_SERVER['SERVER_PROTOCOL']) && in_array($_SERVER['SERVER_PROTOCOL'], array('HTTP/1.0', 'HTTP/1.1', 'HTTP/2'), TRUE))
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? $_SERVER['SERVER_PROTOCOL'] : 'HTTP/1.1';
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header($server_protocol.' '.$code.' '.$text, TRUE, $code);
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}
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}
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// --------------------------------------------------------------------
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if ( ! function_exists('_error_handler'))
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{
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/**
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* Error Handler
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*
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* This is the custom error handler that is declared at the (relative)
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|
* top of CodeIgniter.php. The main reason we use this is to permit
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* PHP errors to be logged in our own log files since the user may
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* not have access to server logs. Since this function effectively
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* intercepts PHP errors, however, we also need to display errors
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* based on the current error_reporting level.
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|
* We do that with the use of a PHP error template.
|
|
*
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|
* @param int $severity
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* @param string $message
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* @param string $filepath
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* @param int $line
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* @return void
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*/
|
|
function _error_handler($severity, $message, $filepath, $line)
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{
|
|
$is_error = (((E_ERROR | E_PARSE | E_COMPILE_ERROR | E_CORE_ERROR | E_USER_ERROR) & $severity) === $severity);
|
|
|
|
// When an error occurred, set the status header to '500 Internal Server Error'
|
|
// to indicate to the client something went wrong.
|
|
// This can't be done within the $_error->show_php_error method because
|
|
// it is only called when the display_errors flag is set (which isn't usually
|
|
// the case in a production environment) or when errors are ignored because
|
|
// they are above the error_reporting threshold.
|
|
if ($is_error)
|
|
{
|
|
set_status_header(500);
|
|
}
|
|
|
|
// Should we ignore the error? We'll get the current error_reporting
|
|
// level and add its bits with the severity bits to find out.
|
|
if (($severity & error_reporting()) !== $severity)
|
|
{
|
|
return;
|
|
}
|
|
|
|
$_error =& load_class('Exceptions', 'core');
|
|
$_error->log_exception($severity, $message, $filepath, $line);
|
|
|
|
// Should we display the error?
|
|
if (str_ireplace(array('off', 'none', 'no', 'false', 'null'), '', ini_get('display_errors')))
|
|
{
|
|
$_error->show_php_error($severity, $message, $filepath, $line);
|
|
}
|
|
|
|
// If the error is fatal, the execution of the script should be stopped because
|
|
// errors can't be recovered from. Halting the script conforms with PHP's
|
|
// default error handling. See http://www.php.net/manual/en/errorfunc.constants.php
|
|
if ($is_error)
|
|
{
|
|
exit(1); // EXIT_ERROR
|
|
}
|
|
}
|
|
}
|
|
|
|
// ------------------------------------------------------------------------
|
|
|
|
if ( ! function_exists('_exception_handler'))
|
|
{
|
|
/**
|
|
* Exception Handler
|
|
*
|
|
* Sends uncaught exceptions to the logger and displays them
|
|
* only if display_errors is On so that they don't show up in
|
|
* production environments.
|
|
*
|
|
* @param Exception $exception
|
|
* @return void
|
|
*/
|
|
function _exception_handler($exception)
|
|
{
|
|
$_error =& load_class('Exceptions', 'core');
|
|
$_error->log_exception('error', 'Exception: '.$exception->getMessage(), $exception->getFile(), $exception->getLine());
|
|
|
|
is_cli() OR set_status_header(500);
|
|
// Should we display the error?
|
|
if (str_ireplace(array('off', 'none', 'no', 'false', 'null'), '', ini_get('display_errors')))
|
|
{
|
|
$_error->show_exception($exception);
|
|
}
|
|
|
|
exit(1); // EXIT_ERROR
|
|
}
|
|
}
|
|
|
|
// ------------------------------------------------------------------------
|
|
|
|
if ( ! function_exists('_shutdown_handler'))
|
|
{
|
|
/**
|
|
* Shutdown Handler
|
|
*
|
|
* This is the shutdown handler that is declared at the top
|
|
* of CodeIgniter.php. The main reason we use this is to simulate
|
|
* a complete custom exception handler.
|
|
*
|
|
* E_STRICT is purposively neglected because such events may have
|
|
* been caught. Duplication or none? None is preferred for now.
|
|
*
|
|
* @link http://insomanic.me.uk/post/229851073/php-trick-catching-fatal-errors-e-error-with-a
|
|
* @return void
|
|
*/
|
|
function _shutdown_handler()
|
|
{
|
|
$last_error = error_get_last();
|
|
if (isset($last_error) &&
|
|
($last_error['type'] & (E_ERROR | E_PARSE | E_CORE_ERROR | E_CORE_WARNING | E_COMPILE_ERROR | E_COMPILE_WARNING)))
|
|
{
|
|
_error_handler($last_error['type'], $last_error['message'], $last_error['file'], $last_error['line']);
|
|
}
|
|
}
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
if ( ! function_exists('remove_invisible_characters'))
|
|
{
|
|
/**
|
|
* Remove Invisible Characters
|
|
*
|
|
* This prevents sandwiching null characters
|
|
* between ascii characters, like Java\0script.
|
|
*
|
|
* @param string
|
|
* @param bool
|
|
* @return string
|
|
*/
|
|
function remove_invisible_characters($str, $url_encoded = TRUE)
|
|
{
|
|
$non_displayables = array();
|
|
|
|
// every control character except newline (dec 10),
|
|
// carriage return (dec 13) and horizontal tab (dec 09)
|
|
if ($url_encoded)
|
|
{
|
|
$non_displayables[] = '/%0[0-8bcef]/i'; // url encoded 00-08, 11, 12, 14, 15
|
|
$non_displayables[] = '/%1[0-9a-f]/i'; // url encoded 16-31
|
|
$non_displayables[] = '/%7f/i'; // url encoded 127
|
|
}
|
|
|
|
$non_displayables[] = '/[\x00-\x08\x0B\x0C\x0E-\x1F\x7F]+/S'; // 00-08, 11, 12, 14-31, 127
|
|
|
|
do
|
|
{
|
|
$str = preg_replace($non_displayables, '', $str, -1, $count);
|
|
}
|
|
while ($count);
|
|
|
|
return $str;
|
|
}
|
|
}
|
|
|
|
// ------------------------------------------------------------------------
|
|
|
|
if ( ! function_exists('html_escape'))
|
|
{
|
|
/**
|
|
* Returns HTML escaped variable.
|
|
*
|
|
* @param mixed $var The input string or array of strings to be escaped.
|
|
* @param bool $double_encode $double_encode set to FALSE prevents escaping twice.
|
|
* @return mixed The escaped string or array of strings as a result.
|
|
*/
|
|
function html_escape($var, $double_encode = TRUE)
|
|
{
|
|
if (empty($var))
|
|
{
|
|
return $var;
|
|
}
|
|
|
|
if (is_array($var))
|
|
{
|
|
foreach (array_keys($var) as $key)
|
|
{
|
|
$var[$key] = html_escape($var[$key], $double_encode);
|
|
}
|
|
|
|
return $var;
|
|
}
|
|
|
|
return htmlspecialchars($var, ENT_QUOTES, config_item('charset'), $double_encode);
|
|
}
|
|
}
|
|
|
|
// ------------------------------------------------------------------------
|
|
|
|
if ( ! function_exists('_stringify_attributes'))
|
|
{
|
|
/**
|
|
* Stringify attributes for use in HTML tags.
|
|
*
|
|
* Helper function used to convert a string, array, or object
|
|
* of attributes to a string.
|
|
*
|
|
* @param mixed string, array, object
|
|
* @param bool
|
|
* @return string
|
|
*/
|
|
function _stringify_attributes($attributes, $js = FALSE)
|
|
{
|
|
$atts = NULL;
|
|
|
|
if (empty($attributes))
|
|
{
|
|
return $atts;
|
|
}
|
|
|
|
if (is_string($attributes))
|
|
{
|
|
return ' '.$attributes;
|
|
}
|
|
|
|
$attributes = (array) $attributes;
|
|
|
|
foreach ($attributes as $key => $val)
|
|
{
|
|
$atts .= ($js) ? $key.'='.$val.',' : ' '.$key.'="'.$val.'"';
|
|
}
|
|
|
|
return rtrim($atts, ',');
|
|
}
|
|
}
|
|
|
|
// ------------------------------------------------------------------------
|
|
|
|
if ( ! function_exists('function_usable'))
|
|
{
|
|
/**
|
|
* Function usable
|
|
*
|
|
* Executes a function_exists() check, and if the Suhosin PHP
|
|
* extension is loaded - checks whether the function that is
|
|
* checked might be disabled in there as well.
|
|
*
|
|
* This is useful as function_exists() will return FALSE for
|
|
* functions disabled via the *disable_functions* php.ini
|
|
* setting, but not for *suhosin.executor.func.blacklist* and
|
|
* *suhosin.executor.disable_eval*. These settings will just
|
|
* terminate script execution if a disabled function is executed.
|
|
*
|
|
* The above described behavior turned out to be a bug in Suhosin,
|
|
* but even though a fix was committed for 0.9.34 on 2012-02-12,
|
|
* that version is yet to be released. This function will therefore
|
|
* be just temporary, but would probably be kept for a few years.
|
|
*
|
|
* @link http://www.hardened-php.net/suhosin/
|
|
* @param string $function_name Function to check for
|
|
* @return bool TRUE if the function exists and is safe to call,
|
|
* FALSE otherwise.
|
|
*/
|
|
function function_usable($function_name)
|
|
{
|
|
static $_suhosin_func_blacklist;
|
|
|
|
if (function_exists($function_name))
|
|
{
|
|
if ( ! isset($_suhosin_func_blacklist))
|
|
{
|
|
$_suhosin_func_blacklist = extension_loaded('suhosin')
|
|
? explode(',', trim(ini_get('suhosin.executor.func.blacklist')))
|
|
: array();
|
|
}
|
|
|
|
return ! in_array($function_name, $_suhosin_func_blacklist, TRUE);
|
|
}
|
|
|
|
return FALSE;
|
|
}
|
|
}
|