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<?php /** * CodeIgniter * * An open source application development framework for PHP * * This content is released under the MIT License (MIT) * * Copyright (c) 2014 - 2018, British Columbia Institute of Technology * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. * * @package CodeIgniter * @author EllisLab Dev Team * @copyright Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/) * @copyright Copyright (c) 2014 - 2018, British Columbia Institute of Technology (http://bcit.ca/) * @license http://opensource.org/licenses/MIT MIT License * @link https://codeigniter.com * @since Version 1.0.0 * @filesource */ defined('BASEPATH') OR exit('No direct script access allowed'); /** * Common Functions * * Loads the base classes and executes the request. * * @package CodeIgniter * @subpackage CodeIgniter * @category Common Functions * @author EllisLab Dev Team * @link https://codeigniter.com/user_guide/ */ // ------------------------------------------------------------------------ if ( ! function_exists('is_php')) { /** * Determines if the current version of PHP is equal to or greater than the supplied value * * @param string * @return bool TRUE if the current version is $version or higher */ function is_php($version) { static $_is_php; $version = (string) $version; if ( ! isset($_is_php[$version])) { $_is_php[$version] = version_compare(PHP_VERSION, $version, '>='); } return $_is_php[$version]; } } // ------------------------------------------------------------------------ if ( ! function_exists('is_really_writable')) { /** * Tests for file writability * * is_writable() returns TRUE on Windows servers when you really can't write to * the file, based on the read-only attribute. is_writable() is also unreliable * on Unix servers if safe_mode is on. * * @link https://bugs.php.net/bug.php?id=54709 * @param string * @return bool */ function is_really_writable($file) { // If we're on a Unix server with safe_mode off we call is_writable if (DIRECTORY_SEPARATOR === '/' && (is_php('5.4') OR ! ini_get('safe_mode'))) { return is_writable($file); } /* For Windows servers and safe_mode "on" installations we'll actually * write a file then read it. Bah... */ if (is_dir($file)) { $file = rtrim($file, '/').'/'.md5(mt_rand()); if (($fp = @fopen($file, 'ab')) === FALSE) { return FALSE; } fclose($fp); @chmod($file, 0777); @unlink($file); return TRUE; } elseif ( ! is_file($file) OR ($fp = @fopen($file, 'ab')) === FALSE) { return FALSE; } fclose($fp); return TRUE; } } // ------------------------------------------------------------------------ if ( ! function_exists('load_class')) { /** * Class registry * * This function acts as a singleton. If the requested class does not * exist it is instantiated and set to a static variable. If it has * previously been instantiated the variable is returned. * * @param string the class name being requested * @param string the directory where the class should be found * @param mixed an optional argument to pass to the class constructor * @return object */ function &load_class($class, $directory = 'libraries', $param = NULL) { static $_classes = array(); // Does the class exist? If so, we're done... if (isset($_classes[$class])) { return $_classes[$class]; } $name = FALSE; // Look for the class first in the local application/libraries folder // then in the native system/libraries folder foreach (array(APPPATH, BASEPATH) as $path) { if (file_exists($path.$directory.'/'.$class.'.php')) { $name = 'CI_'.$class; if (class_exists($name, FALSE) === FALSE) { require_once($path.$directory.'/'.$class.'.php'); } break; } } // Is the request a class extension? If so we load it too if (file_exists(APPPATH.$directory.'/'.config_item('subclass_prefix').$class.'.php')) { $name = config_item('subclass_prefix').$class; if (class_exists($name, FALSE) === FALSE) { require_once(APPPATH.$directory.'/'.$name.'.php'); } } // Did we find the class? if ($name === FALSE) { // Note: We use exit() rather than show_error() in order to avoid a // self-referencing loop with the Exceptions class set_status_header(503); echo 'Unable to locate the specified class: '.$class.'.php'; exit(5); // EXIT_UNK_CLASS } // Keep track of what we just loaded is_loaded($class); $_classes[$class] = isset($param) ? new $name($param) : new $name(); return $_classes[$class]; } } // -------------------------------------------------------------------- if ( ! function_exists('is_loaded')) { /** * Keeps track of which libraries have been loaded. This function is * called by the load_class() function above * * @param string * @return array */ function &is_loaded($class = '') { static $_is_loaded = array(); if ($class !== '') { $_is_loaded[strtolower($class)] = $class; } return $_is_loaded; } } // ------------------------------------------------------------------------ if ( ! function_exists('get_config')) { /** * Loads the main config.php file * * This function lets us grab the config file even if the Config class * hasn't been instantiated yet * * @param array * @return array */ function &get_config(Array $replace = array()) { static $config; if (empty($config)) { $file_path = APPPATH.'config/config.php'; $found = FALSE; if (file_exists($file_path)) { $found = TRUE; require($file_path); } // Is the config file in the environment folder? if (file_exists($file_path = APPPATH.'config/'.ENVIRONMENT.'/config.php')) { require($file_path); } elseif ( ! $found) { set_status_header(503); echo 'The configuration file does not exist.'; exit(3); // EXIT_CONFIG } // Does the $config array exist in the file? if ( ! isset($config) OR ! is_array($config)) { set_status_header(503); echo 'Your config file does not appear to be formatted correctly.'; exit(3); // EXIT_CONFIG } } // Are any values being dynamically added or replaced? foreach ($replace as $key => $val) { $config[$key] = $val; } return $config; } } // ------------------------------------------------------------------------ if ( ! function_exists('config_item')) { /** * Returns the specified config item * * @param string * @return mixed */ function config_item($item) { static $_config; if (empty($_config)) { // references cannot be directly assigned to static variables, so we use an array $_config[0] =& get_config(); } return isset($_config[0][$item]) ? $_config[0][$item] : NULL; } } // ------------------------------------------------------------------------ if ( ! function_exists('get_mimes')) { /** * Returns the MIME types array from config/mimes.php * * @return array */ function &get_mimes() { static $_mimes; if (empty($_mimes)) { $_mimes = file_exists(APPPATH.'config/mimes.php') ? include(APPPATH.'config/mimes.php') : array(); if (file_exists(APPPATH.'config/'.ENVIRONMENT.'/mimes.php')) { $_mimes = array_merge($_mimes, include(APPPATH.'config/'.ENVIRONMENT.'/mimes.php')); } } return $_mimes; } } // ------------------------------------------------------------------------ if ( ! function_exists('is_https')) { /** * Is HTTPS? * * Determines if the application is accessed via an encrypted * (HTTPS) connection. * * @return bool */ function is_https() { if ( ! empty($_SERVER['HTTPS']) && strtolower($_SERVER['HTTPS']) !== 'off') { return TRUE; } elseif (isset($_SERVER['HTTP_X_FORWARDED_PROTO']) && strtolower($_SERVER['HTTP_X_FORWARDED_PROTO']) === 'https') { return TRUE; } elseif ( ! empty($_SERVER['HTTP_FRONT_END_HTTPS']) && strtolower($_SERVER['HTTP_FRONT_END_HTTPS']) !== 'off') { return TRUE; } return FALSE; } } // ------------------------------------------------------------------------ if ( ! function_exists('is_cli')) { /** * Is CLI? * * Test to see if a request was made from the command line. * * @return bool */ function is_cli() { return (PHP_SAPI === 'cli' OR defined('STDIN')); } } // ------------------------------------------------------------------------ if ( ! function_exists('show_error')) { /** * Error Handler * * This function lets us invoke the exception class and * display errors using the standard error template located * in application/views/errors/error_general.php * This function will send the error page directly to the * browser and exit. * * @param string * @param int * @param string * @return void */ function show_error($message, $status_code = 500, $heading = 'An Error Was Encountered') { $status_code = abs($status_code); if ($status_code < 100) { $exit_status = $status_code + 9; // 9 is EXIT__AUTO_MIN $status_code = 500; } else { $exit_status = 1; // EXIT_ERROR } $_error =& load_class('Exceptions', 'core'); echo $_error->show_error($heading, $message, 'error_general', $status_code); exit($exit_status); } } // ------------------------------------------------------------------------ if ( ! function_exists('show_404')) { /** * 404 Page Handler * * This function is similar to the show_error() function above * However, instead of the standard error template it displays * 404 errors. * * @param string * @param bool * @return void */ function show_404($page = '', $log_error = TRUE) { $_error =& load_class('Exceptions', 'core'); $_error->show_404($page, $log_error); exit(4); // EXIT_UNKNOWN_FILE } } // ------------------------------------------------------------------------ if ( ! function_exists('log_message')) { /** * Error Logging Interface * * We use this as a simple mechanism to access the logging * class and send messages to be logged. * * @param string the error level: 'error', 'debug' or 'info' * @param string the error message * @return void */ function log_message($level, $message) { static $_log; if ($_log === NULL) { // references cannot be directly assigned to static variables, so we use an array $_log[0] =& load_class('Log', 'core'); } $_log[0]->write_log($level, $message); } } // ------------------------------------------------------------------------ if ( ! function_exists('set_status_header')) { /** * Set HTTP Status Header * * @param int the status code * @param string * @return void */ function set_status_header($code = 200, $text = '') { if (is_cli()) { return; } if (empty($code) OR ! is_numeric($code)) { show_error('Status codes must be numeric', 500); } if (empty($text)) { is_int($code) OR $code = (int) $code; $stati = array( 100 => 'Continue', 101 => 'Switching Protocols', 200 => 'OK', 201 => 'Created', 202 => 'Accepted', 203 => 'Non-Authoritative Information', 204 => 'No Content', 205 => 'Reset Content', 206 => 'Partial Content', 300 => 'Multiple Choices', 301 => 'Moved Permanently', 302 => 'Found', 303 => 'See Other', 304 => 'Not Modified', 305 => 'Use Proxy', 307 => 'Temporary Redirect', 400 => 'Bad Request', 401 => 'Unauthorized', 402 => 'Payment Required', 403 => 'Forbidden', 404 => 'Not Found', 405 => 'Method Not Allowed', 406 => 'Not Acceptable', 407 => 'Proxy Authentication Required', 408 => 'Request Timeout', 409 => 'Conflict', 410 => 'Gone', 411 => 'Length Required', 412 => 'Precondition Failed', 413 => 'Request Entity Too Large', 414 => 'Request-URI Too Long', 415 => 'Unsupported Media Type', 416 => 'Requested Range Not Satisfiable', 417 => 'Expectation Failed', 422 => 'Unprocessable Entity', 426 => 'Upgrade Required', 428 => 'Precondition Required', 429 => 'Too Many Requests', 431 => 'Request Header Fields Too Large', 500 => 'Internal Server Error', 501 => 'Not Implemented', 502 => 'Bad Gateway', 503 => 'Service Unavailable', 504 => 'Gateway Timeout', 505 => 'HTTP Version Not Supported', 511 => 'Network Authentication Required', ); if (isset($stati[$code])) { $text = $stati[$code]; } else { show_error('No status text available. Please check your status code number or supply your own message text.', 500); } } if (strpos(PHP_SAPI, 'cgi') === 0) { header('Status: '.$code.' '.$text, TRUE); return; } $server_protocol = (isset($_SERVER['SERVER_PROTOCOL']) && in_array($_SERVER['SERVER_PROTOCOL'], array('HTTP/1.0', 'HTTP/1.1', 'HTTP/2'), TRUE)) ? $_SERVER['SERVER_PROTOCOL'] : 'HTTP/1.1'; header($server_protocol.' '.$code.' '.$text, TRUE, $code); } } // -------------------------------------------------------------------- if ( ! function_exists('_error_handler')) { /** * Error Handler * * This is the custom error handler that is declared at the (relative) * top of CodeIgniter.php. The main reason we use this is to permit * PHP errors to be logged in our own log files since the user may * not have access to server logs. Since this function effectively * intercepts PHP errors, however, we also need to display errors * based on the current error_reporting level. * We do that with the use of a PHP error template. * * @param int $severity * @param string $message * @param string $filepath * @param int $line * @return void */ function _error_handler($severity, $message, $filepath, $line) { $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; } }