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CodeIgniter4/system/Common.php

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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 CodeIgniter Dev Team
* @copyright 2014-2018 British Columbia Institute of Technology (https://bcit.ca/)
* @license https://opensource.org/licenses/MIT MIT License
* @link https://codeigniter.com
* @since Version 3.0.0
* @filesource
*/
use CodeIgniter\HTTP\RequestInterface;
use CodeIgniter\HTTP\ResponseInterface;
use Config\Services;
/**
* Common Functions
*
* Several application-wide utility methods.
*
* @package CodeIgniter
* @category Common Functions
*/
//--------------------------------------------------------------------
// Services Convenience Functions
//--------------------------------------------------------------------
if ( ! function_exists('cache'))
{
/**
* A convenience method that provides access to the Cache
* object. If no parameter is provided, will return the object,
* otherwise, will attempt to return the cached value.
*
* Examples:
* cache()->save('foo', 'bar');
* $foo = cache('bar');
*
* @param string|null $key
*
* @return \CodeIgniter\Cache\CacheInterface|mixed
*/
function cache(string $key = null)
{
$cache = \Config\Services::cache();
// No params - return cache object
if (is_null($key))
{
return $cache;
}
// Still here? Retrieve the value.
return $cache->get($key);
}
}
//--------------------------------------------------------------------
if ( ! function_exists('config'))
{
/**
* More simple way of getting config instances
*
* @param string $name
* @param bool $getShared
*
* @return mixed
*/
function config(string $name, bool $getShared = true)
{
return \CodeIgniter\Config\Config::get($name, $getShared);
}
}
//--------------------------------------------------------------------
if ( ! function_exists('view'))
{
/**
* Grabs the current RendererInterface-compatible class
* and tells it to render the specified view. Simply provides
* a convenience method that can be used in Controllers,
* libraries, and routed closures.
*
* NOTE: Does not provide any escaping of the data, so that must
* all be handled manually by the developer.
*
* @param string $name
* @param array $data
* @param array $options Unused - reserved for third-party extensions.
*
* @return string
*/
function view(string $name, array $data = [], array $options = [])
{
/**
* @var CodeIgniter\View\View $renderer
*/
$renderer = Services::renderer();
$saveData = null;
if (array_key_exists('saveData', $options) && $options['saveData'] === true)
{
$saveData = (bool) $options['saveData'];
unset($options['saveData']);
}
return $renderer->setData($data, 'raw')
->render($name, $options, $saveData);
}
}
//--------------------------------------------------------------------
if ( ! function_exists('view_cell'))
{
/**
* View cells are used within views to insert HTML chunks that are managed
* by other classes.
*
* @param string $library
* @param null $params
* @param int $ttl
* @param string|null $cacheName
*
* @return string
*/
function view_cell(string $library, $params = null, int $ttl = 0, string $cacheName = null)
{
return Services::viewcell()
->render($library, $params, $ttl, $cacheName);
}
}
//--------------------------------------------------------------------
if ( ! function_exists('env'))
{
/**
* Allows user to retrieve values from the environment
* variables that have been set. Especially useful for
* retrieving values set from the .env file for
* use in config files.
*
* @param string $key
* @param null $default
*
* @return mixed
*/
function env(string $key, $default = null)
{
$value = getenv($key);
if ($value === false)
{
$value = $_ENV[$key] ?? $_SERVER[$key] ?? false;
}
// Not found? Return the default value
if ($value === false)
{
return $default;
}
// Handle any boolean values
switch (strtolower($value))
{
case 'true':
return true;
case 'false':
return false;
case 'empty':
return '';
case 'null':
return;
}
return $value;
}
}
//--------------------------------------------------------------------
if ( ! function_exists('esc'))
{
/**
* Performs simple auto-escaping of data for security reasons.
* Might consider making this more complex at a later date.
*
* If $data is a string, then it simply escapes and returns it.
* If $data is an array, then it loops over it, escaping each
* 'value' of the key/value pairs.
*
* Valid context values: html, js, css, url, attr, raw, null
*
* @param string|array $data
* @param string $context
* @param string $encoding
*
* @return string|array
*/
function esc($data, $context = 'html', $encoding = null)
{
if (is_array($data))
{
foreach ($data as $key => &$value)
{
$value = esc($value, $context);
}
}
if (is_string($data))
{
$context = strtolower($context);
// Provide a way to NOT escape data since
// this could be called automatically by
// the View library.
if (empty($context) || $context == 'raw')
{
return $data;
}
if ( ! in_array($context, ['html', 'js', 'css', 'url', 'attr']))
{
throw new \InvalidArgumentException('Invalid escape context provided.');
}
if ($context == 'attr')
{
$method = 'escapeHtmlAttr';
}
else
{
$method = 'escape' . ucfirst($context);
}
static $escaper;
if (! $escaper)
{
$escaper = new \Zend\Escaper\Escaper($encoding);
}
if ($encoding && $escaper->getEncoding() !== $encoding)
{
$escaper = new \Zend\Escaper\Escaper($encoding);
}
$data = $escaper->$method($data);
}
return $data;
}
}
//--------------------------------------------------------------------
if ( ! function_exists('session'))
{
/**
* A convenience method for accessing the session instance,
* or an item that has been set in the session.
*
* Examples:
* session()->set('foo', 'bar');
* $foo = session('bar');
*
* @param string $val
*
* @return \CodeIgniter\Session\Session|mixed|null
*/
function session($val = null)
{
$session = \Config\Services::session();
// Returning a single item?
if (is_string($val))
{
return $session->get($val);
}
return $session;
}
}
//--------------------------------------------------------------------
if ( ! function_exists('timer'))
{
/**
* A convenience method for working with the timer.
* If no parameter is passed, it will return the timer instance,
* otherwise will start or stop the timer intelligently.
*
* @param string|null $name
*
* @return \CodeIgniter\Debug\Timer|mixed
*/
function timer(string $name = null)
{
$timer = \Config\Services::timer();
if (empty($name))
{
return $timer;
}
if ($timer->has($name))
{
return $timer->stop($name);
}
return $timer->start($name);
}
}
//--------------------------------------------------------------------
if ( ! function_exists('service'))
{
/**
* Allows cleaner access to the Services Config file.
* Always returns a SHARED instance of the class, so
* calling the function multiple times should always
* return the same instance.
*
* These are equal:
* - $timer = service('timer')
* - $timer = \CodeIgniter\Config\Services::timer();
*
* @param string $name
* @param array ...$params
*
* @return mixed
*/
function service(string $name, ...$params)
{
return Services::$name(...$params);
}
}
//--------------------------------------------------------------------
if ( ! function_exists('single_service'))
{
/**
* Allow cleaner access to a Service.
* Always returns a new instance of the class.
*
* @param string $name
* @param array|null $params
*
* @return mixed
*/
function single_service(string $name, ...$params)
{
// Ensure it's NOT a shared instance
array_push($params, false);
return Services::$name(...$params);
}
}
//--------------------------------------------------------------------
if ( ! function_exists('lang'))
{
/**
* A convenience method to translate a string and format it
* with the intl extension's MessageFormatter object.
*
* @param string $line
* @param array $args
* @param string $locale
*
* @return string
*/
function lang(string $line, array $args = [], string $locale = null)
{
return Services::language($locale)
->getLine($line, $args);
}
}
//--------------------------------------------------------------------
if ( ! function_exists('log_message'))
{
/**
* A convenience/compatibility method for logging events through
* the Log system.
*
* Allowed log levels are:
* - emergency
* - alert
* - critical
* - error
* - warning
* - notice
* - info
* - debug
*
* @param string $level
* @param string $message
* @param array|null $context
*
* @return mixed
*/
function log_message(string $level, string $message, array $context = [])
{
// When running tests, we want to always ensure that the
// TestLogger is running, which provides utilities for
// for asserting that logs were called in the test code.
if (ENVIRONMENT == 'testing')
{
$logger = new \Tests\Support\Log\TestLogger(new \Config\Logger());
return $logger->log($level, $message, $context);
}
// @codeCoverageIgnoreStart
return Services::logger(true)
->log($level, $message, $context);
// @codeCoverageIgnoreEnd
}
}
//--------------------------------------------------------------------
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' || defined('STDIN'));
}
}
//--------------------------------------------------------------------
if ( ! function_exists('route_to'))
{
/**
* Given a controller/method string and any params,
* will attempt to build the relative URL to the
* matching route.
*
* NOTE: This requires the controller/method to
* have a route defined in the routes Config file.
*
* @param string $method
* @param array ...$params
*
* @return false|string
*/
function route_to(string $method, ...$params): string
{
$routes = Services::routes();
return $routes->reverseRoute($method, ...$params);
}
}
//--------------------------------------------------------------------
if ( ! function_exists('remove_invisible_characters'))
{
/**
* Remove Invisible Characters
*
* This prevents sandwiching null characters
* between ascii characters, like Java\0script.
*
* @param string $str
* @param bool $url_encoded
*
* @return string
*/
function remove_invisible_characters($str, $url_encoded = true)
{
$non_displayables = [];
// every control character except newline (dec 10),
// carriage return (dec 13) and horizontal tab (dec 09)
if ($url_encoded)
{
$non_displayables[] = '/%0[0-8bcef]/'; // url encoded 00-08, 11, 12, 14, 15
$non_displayables[] = '/%1[0-9a-f]/'; // url encoded 16-31
}
$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('helper'))
{
/**
* Loads a helper file into memory. Supports namespaced helpers,
* both in and out of the 'helpers' directory of a namespaced directory.
*
* @param string|array $filenames
*/
function helper($filenames)
{
$loader = Services::locator(true);
if ( ! is_array($filenames))
{
$filenames = [$filenames];
}
foreach ($filenames as $filename)
{
if (strpos($filename, '_helper') === false)
{
$filename .= '_helper';
}
$path = $loader->locateFile($filename, 'Helpers');
if ( ! empty($path))
{
include_once $path;
}
}
}
}
//--------------------------------------------------------------------
if ( ! function_exists('app_timezone'))
{
/**
* Returns the timezone the application has been set to display
* dates in. This might be different than the timezone set
* at the server level, as you often want to stores dates in UTC
* and convert them on the fly for the user.
*
* @return string
*/
function app_timezone()
{
$config = config(\Config\App::class);
return $config->appTimezone;
}
}
//--------------------------------------------------------------------
if ( ! function_exists('csrf_token'))
{
/**
* Returns the CSRF token name.
* Can be used in Views when building hidden inputs manually,
* or used in javascript vars when using APIs.
*
* @return string
*/
function csrf_token()
{
$config = config(\Config\App::class);
return $config->CSRFTokenName;
}
}
//--------------------------------------------------------------------
if ( ! function_exists('csrf_hash'))
{
/**
* Returns the current hash value for the CSRF protection.
* Can be used in Views when building hidden inputs manually,
* or used in javascript vars for API usage.
*
* @return string
*/
function csrf_hash()
{
$security = Services::security(null, true);
return $security->getCSRFHash();
}
}
//--------------------------------------------------------------------
if ( ! function_exists('csrf_field'))
{
/**
* Generates a hidden input field for use within manually generated forms.
*
* @return string
*/
function csrf_field()
{
return '<input type="hidden" name="' . csrf_token() . '" value="' . csrf_hash() . '">';
}
}
//--------------------------------------------------------------------
if ( ! function_exists('force_https'))
{
/**
* Used to force a page to be accessed in via HTTPS.
* Uses a standard redirect, plus will set the HSTS header
* for modern browsers that support, which gives best
* protection against man-in-the-middle attacks.
*
* @see https://en.wikipedia.org/wiki/HTTP_Strict_Transport_Security
*
* @param int $duration How long should the SSL header be set for? (in seconds)
* Defaults to 1 year.
* @param RequestInterface $request
* @param ResponseInterface $response
*
* Not testable, as it will exit!
*
* @throws \CodeIgniter\HTTP\RedirectException
* @codeCoverageIgnore
*/
function force_https(int $duration = 31536000, RequestInterface $request = null, ResponseInterface $response = null)
{
if (is_null($request))
{
$request = Services::request(null, true);
}
if (is_null($response))
{
$response = Services::response(null, true);
}
if (is_cli() || $request->isSecure())
{
return;
}
// If the session library is loaded, we should regenerate
// the session ID for safety sake.
if (class_exists('Session', false))
{
Services::session(null, true)
->regenerate();
}
$uri = $request->uri;
$uri->setScheme('https');
$uri = \CodeIgniter\HTTP\URI::createURIString(
$uri->getScheme(), $uri->getAuthority(true), $uri->getPath(), // Absolute URIs should use a "/" for an empty path
$uri->getQuery(), $uri->getFragment()
);
// Set an HSTS header
$response->setHeader('Strict-Transport-Security', 'max-age=' . $duration);
$response->redirect($uri);
exit();
}
}
//--------------------------------------------------------------------
if (! function_exists('old'))
{
/**
* Provides access to "old input" that was set in the session
* during a redirect()->withInput().
*
* @param string $key
* @param null $default
* @param string|bool $escape
*
* @return mixed|null
*/
function old(string $key, $default = null, $escape = 'html')
{
$request = Services::request();
$value = $request->getOldInput($key);
// Return the default value if nothing
// found in the old input.
if (is_null($value))
{
return $default;
}
// If the result was serialized array or string, then unserialize it for use...
if (strpos($value, 'a:') === 0 || strpos($value, 's:') === 0)
{
$value = unserialize($value);
}
return $escape === false ? $value : esc($value, $escape);
}
}
//--------------------------------------------------------------------
if ( ! function_exists('redirect'))
{
/**
* Convenience method that works with the current global $request and
* $router instances to redirect using named/reverse-routed routes
* to determine the URL to go to. If nothing is found, will treat
* as a traditional redirect and pass the string in, letting
* $response->redirect() determine the correct method and code.
*
* If more control is needed, you must use $response->redirect explicitly.
*
* @param string $uri
*
* @return \CodeIgniter\HTTP\RedirectResponse
*/
function redirect(string $uri=null)
{
$response = Services::redirectResponse(null, true);
if (! empty($uri))
{
return $response->to($uri);
}
return $response;
}
}
//--------------------------------------------------------------------
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 $attributes string, array, object
* @param bool $js
*
* @return string
*/
function stringify_attributes($attributes, $js = false): string
{
$atts = '';
if (empty($attributes))
{
return $atts;
}
if (is_string($attributes))
{
return ' ' . $attributes;
}
$attributes = (array) $attributes;
foreach ($attributes as $key => $val)
{
$atts .= ($js) ? $key . '=' . esc($val, 'js') . ',' : ' ' . $key . '="' . esc($val, 'attr') . '"';
}
return rtrim($atts, ',');
}
}
//--------------------------------------------------------------------
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 $file
*
* @return bool
*
* @codeCoverageIgnore Not practical to test, as travis runs on linux
*/
function is_really_writable($file)
{
// If we're on a Unix server with safe_mode off we call is_writable
if (DIRECTORY_SEPARATOR === '/' || ! 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, '/') . '/' . bin2hex(random_bytes(16));
if (($fp = @fopen($file, 'ab')) === false)
{
return false;
}
fclose($fp);
@chmod($file, 0777);
@unlink($file);
return true;
}
elseif ( ! is_file($file) || ( $fp = @fopen($file, 'ab')) === false)
{
return false;
}
fclose($fp);
return true;
}
}
//--------------------------------------------------------------------
if ( ! function_exists('slash_item'))
{
//Unlike CI3, this function is placed here because
//it's not a config, or part of a config.
/**
* Fetch a config file item with slash appended (if not empty)
*
* @param string $item Config item name
*
* @return string|null The configuration item or NULL if
* the item doesn't exist
*/
function slash_item($item)
{
$config = config(\Config\App::class);
$configItem = $config->{$item};
if ( ! isset($configItem) || empty(trim($configItem)))
{
return $configItem;
}
return rtrim($configItem, '/') . '/';
}
}
//--------------------------------------------------------------------
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 commited 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 $function_name Function to check for
* @return bool TRUE if the function exists and is safe to call,
* FALSE otherwise.
*
* @codeCoverageIgnore This is too exotic
*/
function function_usable($function_name)
{
static $_suhosin_func_blacklist;
if (function_exists($function_name))
{
if ( ! isset($_suhosin_func_blacklist))
{
$_suhosin_func_blacklist = extension_loaded('suhosin') ? explode(',', trim(ini_get('suhosin.executor.func.blacklist'))) : [];
}
return ! in_array($function_name, $_suhosin_func_blacklist, TRUE);
}
return FALSE;
}
}
//--------------------------------------------------------------------
if (! function_exists('dd'))
{
/**
* Prints a Kint debug report and exits.
*
* @param array ...$vars
*
* @codeCoverageIgnore Can't be tested ... exits
*/
function dd(...$vars)
{
Kint::dump(...$vars);
exit;
}
}
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