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730
libraries/loader.php
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730
libraries/loader.php
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<?php
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/**
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* Joomla! Content Management System
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*
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* @copyright (C) 2005 Open Source Matters, Inc. <https://www.joomla.org>
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* @license GNU General Public License version 2 or later; see LICENSE.txt
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*
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* @phpcs:disable PSR1.Classes.ClassDeclaration.MissingNamespace
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*/
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defined('_JEXEC') or die;
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/**
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* Static class to handle loading of libraries.
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*
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* @since 1.7.0
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*/
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abstract class JLoader
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{
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/**
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* Container for already imported library paths.
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*
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* @var array
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* @since 1.7.0
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*/
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protected static $classes = [];
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/**
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* Container for already imported library paths.
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*
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* @var array
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* @since 1.7.0
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*/
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protected static $imported = [];
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/**
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* Container for registered library class prefixes and path lookups.
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*
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* @var array
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* @since 3.0.0
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*/
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protected static $prefixes = [];
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/**
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* Holds proxy classes and the class names the proxy.
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*
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* @var array
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* @since 3.2
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*/
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protected static $classAliases = [];
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/**
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* Holds the inverse lookup for proxy classes and the class names the proxy.
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*
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* @var array
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* @since 3.4
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*/
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protected static $classAliasesInverse = [];
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/**
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* Container for namespace => path map.
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*
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* @var array
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* @since 3.1.4
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*/
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protected static $namespaces = [];
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/**
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* Holds a reference for all deprecated aliases (mainly for use by a logging platform).
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*
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* @var array
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* @since 3.6.3
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*/
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protected static $deprecatedAliases = [];
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/**
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* The root folders where extensions can be found.
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*
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* @var array
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* @since 4.0.0
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*/
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protected static $extensionRootFolders = [];
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/**
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* Method to discover classes of a given type in a given path.
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*
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* @param string $classPrefix The class name prefix to use for discovery.
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* @param string $parentPath Full path to the parent folder for the classes to discover.
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* @param boolean $force True to overwrite the autoload path value for the class if it already exists.
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* @param boolean $recurse Recurse through all child directories as well as the parent path.
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*
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* @return void
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*
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* @since 1.7.0
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*
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* @deprecated 4.3 will be removed in 6.0
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* Classes should be autoloaded. Use JLoader::registerPrefix() or JLoader::registerNamespace() to
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* register an autoloader for your files.
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*/
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public static function discover($classPrefix, $parentPath, $force = true, $recurse = false)
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{
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try {
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if ($recurse) {
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$iterator = new RecursiveIteratorIterator(
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new RecursiveDirectoryIterator($parentPath),
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RecursiveIteratorIterator::SELF_FIRST
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);
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} else {
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$iterator = new DirectoryIterator($parentPath);
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}
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/** @type $file DirectoryIterator */
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foreach ($iterator as $file) {
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$fileName = $file->getFilename();
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// Only load for php files.
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if ($file->isFile() && $file->getExtension() === 'php') {
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// Get the class name and full path for each file.
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$class = strtolower($classPrefix . preg_replace('#\.php$#', '', $fileName));
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// Register the class with the autoloader if not already registered or the force flag is set.
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if ($force || empty(self::$classes[$class])) {
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self::register($class, $file->getPath() . '/' . $fileName);
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}
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}
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}
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} catch (UnexpectedValueException $e) {
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// Exception will be thrown if the path is not a directory. Ignore it.
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}
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}
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/**
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* Method to get the list of registered classes and their respective file paths for the autoloader.
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*
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* @return array The array of class => path values for the autoloader.
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*
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* @since 1.7.0
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*/
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public static function getClassList()
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{
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return self::$classes;
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}
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/**
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* Method to get the list of deprecated class aliases.
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*
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* @return array An associative array with deprecated class alias data.
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*
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* @since 3.6.3
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*/
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public static function getDeprecatedAliases()
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{
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return self::$deprecatedAliases;
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}
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/**
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* Method to get the list of registered namespaces.
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*
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* @return array The array of namespace => path values for the autoloader.
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*
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* @since 3.1.4
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*/
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public static function getNamespaces()
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{
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return self::$namespaces;
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}
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/**
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* Loads a class from specified directories.
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*
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* @param string $key The class name to look for (dot notation).
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* @param string $base Search this directory for the class.
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*
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* @return boolean True on success.
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*
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* @since 1.7.0
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*
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* @deprecated 4.3 will be removed in 6.0
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* Classes should be autoloaded. Use JLoader::registerPrefix() or JLoader::registerNamespace() to
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* register an autoloader for your files.
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*/
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public static function import($key, $base = null)
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{
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// Only import the library if not already attempted.
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if (!isset(self::$imported[$key])) {
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// Setup some variables.
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$success = false;
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$parts = explode('.', $key);
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$class = array_pop($parts);
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$base = (!empty($base)) ? $base : __DIR__;
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$path = str_replace('.', DIRECTORY_SEPARATOR, $key);
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// Handle special case for helper classes.
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if ($class === 'helper') {
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$class = ucfirst(array_pop($parts)) . ucfirst($class);
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} else {
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// Standard class.
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$class = ucfirst($class);
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}
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// If we are importing a library from the Joomla namespace set the class to autoload.
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if (strpos($path, 'joomla') === 0) {
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// Since we are in the Joomla namespace prepend the classname with J.
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$class = 'J' . $class;
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// Only register the class for autoloading if the file exists.
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if (is_file($base . '/' . $path . '.php')) {
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self::$classes[strtolower($class)] = $base . '/' . $path . '.php';
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$success = true;
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}
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} else {
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/**
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* If we are not importing a library from the Joomla namespace directly include the
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* file since we cannot assert the file/folder naming conventions.
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*/
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// If the file exists attempt to include it.
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if (is_file($base . '/' . $path . '.php')) {
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$success = (bool) include_once $base . '/' . $path . '.php';
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}
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}
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// Add the import key to the memory cache container.
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self::$imported[$key] = $success;
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}
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return self::$imported[$key];
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}
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/**
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* Load the file for a class.
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*
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* @param string $class The class to be loaded.
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*
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* @return boolean True on success
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||||
*
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||||
* @since 1.7.0
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*/
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public static function load($class)
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{
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// Sanitize class name.
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$key = strtolower($class);
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// If the class already exists do nothing.
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if (class_exists($class, false)) {
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return true;
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}
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// If the class is registered include the file.
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if (isset(self::$classes[$key])) {
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$found = (bool) include_once self::$classes[$key];
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if ($found) {
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self::loadAliasFor($class);
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}
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// If the class doesn't exists, we probably have a class alias available
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if (!class_exists($class, false)) {
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// Search the alias class, first none namespaced and then namespaced
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$original = array_search($class, self::$classAliases) ?: array_search('\\' . $class, self::$classAliases);
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// When we have an original and the class exists an alias should be created
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if ($original && class_exists($original, false)) {
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class_alias($original, $class);
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}
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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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* Directly register a class to the autoload list.
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*
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* @param string $class The class name to register.
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* @param string $path Full path to the file that holds the class to register.
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* @param boolean $force True to overwrite the autoload path value for the class if it already exists.
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*
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* @return void
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*
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||||
* @since 1.7.0
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||||
*
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||||
* @deprecated 4.3 will be removed in 6.0
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||||
* Classes should be autoloaded. Use JLoader::registerPrefix() or JLoader::registerNamespace() to
|
||||
* register an autoloader for your files.
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||||
*/
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public static function register($class, $path, $force = true)
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{
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// When an alias exists, register it as well
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if (array_key_exists(strtolower($class), self::$classAliases)) {
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self::register(self::stripFirstBackslash(self::$classAliases[strtolower($class)]), $path, $force);
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}
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// Sanitize class name.
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$class = strtolower($class);
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// Only attempt to register the class if the name and file exist.
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if (!empty($class) && is_file($path)) {
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// Register the class with the autoloader if not already registered or the force flag is set.
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if ($force || empty(self::$classes[$class])) {
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self::$classes[$class] = $path;
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||||
}
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||||
}
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||||
}
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||||
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/**
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* Register a class prefix with lookup path. This will allow developers to register library
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* packages with different class prefixes to the system autoloader. More than one lookup path
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* may be registered for the same class prefix, but if this method is called with the reset flag
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* set to true then any registered lookups for the given prefix will be overwritten with the current
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||||
* lookup path. When loaded, prefix paths are searched in a "last in, first out" order.
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||||
*
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* @param string $prefix The class prefix to register.
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||||
* @param string $path Absolute file path to the library root where classes with the given prefix can be found.
|
||||
* @param boolean $reset True to reset the prefix with only the given lookup path.
|
||||
* @param boolean $prepend If true, push the path to the beginning of the prefix lookup paths array.
|
||||
*
|
||||
* @return void
|
||||
*
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||||
* @throws RuntimeException
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||||
*
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||||
* @since 3.0.0
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||||
*/
|
||||
public static function registerPrefix($prefix, $path, $reset = false, $prepend = false)
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||||
{
|
||||
// Verify the library path exists.
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||||
if (!is_dir($path)) {
|
||||
$path = (str_replace(JPATH_ROOT, '', $path) == $path) ? basename($path) : str_replace(JPATH_ROOT, '', $path);
|
||||
|
||||
throw new RuntimeException('Library path ' . $path . ' cannot be found.', 500);
|
||||
}
|
||||
|
||||
// If the prefix is not yet registered or we have an explicit reset flag then set set the path.
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||||
if ($reset || !isset(self::$prefixes[$prefix])) {
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||||
self::$prefixes[$prefix] = [$path];
|
||||
} else {
|
||||
// Otherwise we want to simply add the path to the prefix.
|
||||
if ($prepend) {
|
||||
array_unshift(self::$prefixes[$prefix], $path);
|
||||
} else {
|
||||
self::$prefixes[$prefix][] = $path;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/**
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||||
* Offers the ability for "just in time" usage of `class_alias()`.
|
||||
* You cannot overwrite an existing alias.
|
||||
*
|
||||
* @param string $alias The alias name to register.
|
||||
* @param string $original The original class to alias.
|
||||
* @param string|boolean $version The version in which the alias will no longer be present.
|
||||
*
|
||||
* @return boolean True if registration was successful. False if the alias already exists.
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||||
*
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||||
* @since 3.2
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||||
*/
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||||
public static function registerAlias($alias, $original, $version = false)
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||||
{
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||||
// PHP is case insensitive so support all kind of alias combination
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||||
$lowercasedAlias = strtolower($alias);
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||||
|
||||
if (!isset(self::$classAliases[$lowercasedAlias])) {
|
||||
self::$classAliases[$lowercasedAlias] = $original;
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||||
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||||
$original = self::stripFirstBackslash($original);
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||||
|
||||
if (!isset(self::$classAliasesInverse[$original])) {
|
||||
self::$classAliasesInverse[$original] = [$lowercasedAlias];
|
||||
} else {
|
||||
self::$classAliasesInverse[$original][] = $lowercasedAlias;
|
||||
}
|
||||
|
||||
// If given a version, log this alias as deprecated
|
||||
if ($version) {
|
||||
self::$deprecatedAliases[] = ['old' => $alias, 'new' => $original, 'version' => $version];
|
||||
}
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
return false;
|
||||
}
|
||||
|
||||
/**
|
||||
* Register a namespace to the autoloader. When loaded, namespace paths are searched in a "last in, first out" order.
|
||||
*
|
||||
* @param string $namespace A case sensitive Namespace to register.
|
||||
* @param string $path A case sensitive absolute file path to the library root where classes of the given namespace can be found.
|
||||
* @param boolean $reset True to reset the namespace with only the given lookup path.
|
||||
* @param boolean $prepend If true, push the path to the beginning of the namespace lookup paths array.
|
||||
*
|
||||
* @return void
|
||||
*
|
||||
* @throws RuntimeException
|
||||
*
|
||||
* @since 3.1.4
|
||||
*/
|
||||
public static function registerNamespace($namespace, $path, $reset = false, $prepend = false)
|
||||
{
|
||||
// Verify the library path exists.
|
||||
if (!is_dir($path)) {
|
||||
$path = (str_replace(JPATH_ROOT, '', $path) == $path) ? basename($path) : str_replace(JPATH_ROOT, '', $path);
|
||||
|
||||
throw new RuntimeException('Library path ' . $path . ' cannot be found.', 500);
|
||||
}
|
||||
|
||||
// Trim leading and trailing backslashes from namespace, allowing "\Parent\Child", "Parent\Child\" and "\Parent\Child\" to be treated the same way.
|
||||
$namespace = trim($namespace, '\\');
|
||||
|
||||
// If the namespace is not yet registered or we have an explicit reset flag then set the path.
|
||||
if ($reset || !isset(self::$namespaces[$namespace])) {
|
||||
self::$namespaces[$namespace] = [$path];
|
||||
} else {
|
||||
// Otherwise we want to simply add the path to the namespace.
|
||||
if ($prepend) {
|
||||
array_unshift(self::$namespaces[$namespace], $path);
|
||||
} else {
|
||||
self::$namespaces[$namespace][] = $path;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Method to setup the autoloaders for the Joomla Platform.
|
||||
* Since the SPL autoloaders are called in a queue we will add our explicit
|
||||
* class-registration based loader first, then fall back on the autoloader based on conventions.
|
||||
* This will allow people to register a class in a specific location and override platform libraries
|
||||
* as was previously possible.
|
||||
*
|
||||
* @param boolean $enablePsr True to enable autoloading based on PSR-0.
|
||||
* @param boolean $enablePrefixes True to enable prefix based class loading (needed to auto load the Joomla core).
|
||||
* @param boolean $enableClasses True to enable class map based class loading (needed to auto load the Joomla core).
|
||||
*
|
||||
* @return void
|
||||
*
|
||||
* @since 3.1.4
|
||||
*/
|
||||
public static function setup($enablePsr = true, $enablePrefixes = true, $enableClasses = true)
|
||||
{
|
||||
if ($enableClasses) {
|
||||
// Register the class map based autoloader.
|
||||
spl_autoload_register(['JLoader', 'load']);
|
||||
}
|
||||
|
||||
if ($enablePrefixes) {
|
||||
// Register the prefix autoloader.
|
||||
spl_autoload_register(['JLoader', '_autoload']);
|
||||
}
|
||||
|
||||
if ($enablePsr) {
|
||||
// Register the PSR based autoloader.
|
||||
spl_autoload_register(['JLoader', 'loadByPsr']);
|
||||
spl_autoload_register(['JLoader', 'loadByAlias']);
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Method to autoload classes that are namespaced to the PSR-4 standard.
|
||||
*
|
||||
* @param string $class The fully qualified class name to autoload.
|
||||
*
|
||||
* @return boolean True on success, false otherwise.
|
||||
*
|
||||
* @since 3.7.0
|
||||
*
|
||||
* @deprecated 4.3 will be removed in 6.0
|
||||
* Use JLoader::loadByPsr instead
|
||||
*/
|
||||
public static function loadByPsr4($class)
|
||||
{
|
||||
return self::loadByPsr($class);
|
||||
}
|
||||
|
||||
/**
|
||||
* Method to autoload classes that are namespaced to the PSR-4 standard.
|
||||
*
|
||||
* @param string $class The fully qualified class name to autoload.
|
||||
*
|
||||
* @return boolean True on success, false otherwise.
|
||||
*
|
||||
* @since 4.0.0
|
||||
*/
|
||||
public static function loadByPsr($class)
|
||||
{
|
||||
$class = self::stripFirstBackslash($class);
|
||||
|
||||
// Find the location of the last NS separator.
|
||||
$pos = strrpos($class, '\\');
|
||||
|
||||
// If one is found, we're dealing with a NS'd class.
|
||||
if ($pos !== false) {
|
||||
$classPath = str_replace('\\', DIRECTORY_SEPARATOR, substr($class, 0, $pos)) . DIRECTORY_SEPARATOR;
|
||||
$className = substr($class, $pos + 1);
|
||||
} else {
|
||||
// If not, no need to parse path.
|
||||
$classPath = null;
|
||||
$className = $class;
|
||||
}
|
||||
|
||||
$classPath .= $className . '.php';
|
||||
|
||||
// Loop through registered namespaces until we find a match.
|
||||
foreach (self::$namespaces as $ns => $paths) {
|
||||
if (strpos($class, "{$ns}\\") === 0) {
|
||||
$nsPath = trim(str_replace('\\', DIRECTORY_SEPARATOR, $ns), DIRECTORY_SEPARATOR);
|
||||
|
||||
// Loop through paths registered to this namespace until we find a match.
|
||||
foreach ($paths as $path) {
|
||||
$classFilePath = realpath($path . DIRECTORY_SEPARATOR . substr_replace($classPath, '', 0, strlen($nsPath) + 1));
|
||||
|
||||
// We do not allow files outside the namespace root to be loaded
|
||||
if (strpos($classFilePath, realpath($path)) !== 0) {
|
||||
continue;
|
||||
}
|
||||
|
||||
// We check for class_exists to handle case-sensitive file systems
|
||||
if (is_file($classFilePath) && !class_exists($class, false)) {
|
||||
$found = (bool) include_once $classFilePath;
|
||||
|
||||
if ($found) {
|
||||
self::loadAliasFor($class);
|
||||
}
|
||||
|
||||
return $found;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
return false;
|
||||
}
|
||||
|
||||
/**
|
||||
* Method to autoload classes that have been aliased using the registerAlias method.
|
||||
*
|
||||
* @param string $class The fully qualified class name to autoload.
|
||||
*
|
||||
* @return void
|
||||
*
|
||||
* @since 3.2
|
||||
*/
|
||||
public static function loadByAlias($class)
|
||||
{
|
||||
$class = strtolower(self::stripFirstBackslash($class));
|
||||
|
||||
if (isset(self::$classAliases[$class])) {
|
||||
// Force auto-load of the regular class
|
||||
class_exists(self::$classAliases[$class], true);
|
||||
|
||||
// Normally this shouldn't execute as the autoloader will execute applyAliasFor when the regular class is
|
||||
// auto-loaded above.
|
||||
if (!class_exists($class, false) && !interface_exists($class, false)) {
|
||||
class_alias(self::$classAliases[$class], $class);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Applies a class alias for an already loaded class, if a class alias was created for it.
|
||||
*
|
||||
* @param string $class We'll look for and register aliases for this (real) class name
|
||||
*
|
||||
* @return void
|
||||
*
|
||||
* @since 3.4
|
||||
*/
|
||||
public static function applyAliasFor($class)
|
||||
{
|
||||
$class = self::stripFirstBackslash($class);
|
||||
|
||||
if (isset(self::$classAliasesInverse[$class])) {
|
||||
foreach (self::$classAliasesInverse[$class] as $alias) {
|
||||
class_alias($class, $alias);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Autoload a class based on name.
|
||||
*
|
||||
* @param string $class The class to be loaded.
|
||||
*
|
||||
* @return boolean True if the class was loaded, false otherwise.
|
||||
*
|
||||
* @since 1.7.3
|
||||
*/
|
||||
public static function _autoload($class)
|
||||
{
|
||||
foreach (self::$prefixes as $prefix => $lookup) {
|
||||
$chr = strlen($prefix) < strlen($class) ? $class[strlen($prefix)] : 0;
|
||||
|
||||
if (strpos($class, $prefix) === 0 && ($chr === strtoupper($chr))) {
|
||||
return self::_load(substr($class, strlen($prefix)), $lookup);
|
||||
}
|
||||
}
|
||||
|
||||
return false;
|
||||
}
|
||||
|
||||
/**
|
||||
* Load a class based on name and lookup array.
|
||||
*
|
||||
* @param string $class The class to be loaded (without prefix).
|
||||
* @param array $lookup The array of base paths to use for finding the class file.
|
||||
*
|
||||
* @return boolean True if the class was loaded, false otherwise.
|
||||
*
|
||||
* @since 3.0.0
|
||||
*/
|
||||
private static function _load($class, $lookup)
|
||||
{
|
||||
// Split the class name into parts separated by camelCase.
|
||||
$parts = preg_split('/(?<=[a-z0-9])(?=[A-Z])/x', $class);
|
||||
$partsCount = count($parts);
|
||||
|
||||
foreach ($lookup as $base) {
|
||||
// Generate the path based on the class name parts.
|
||||
$path = realpath($base . '/' . implode('/', array_map('strtolower', $parts)) . '.php');
|
||||
|
||||
// Load the file if it exists and is in the lookup path.
|
||||
if (strpos($path, realpath($base)) === 0 && is_file($path)) {
|
||||
$found = (bool) include_once $path;
|
||||
|
||||
if ($found) {
|
||||
self::loadAliasFor($class);
|
||||
}
|
||||
|
||||
return $found;
|
||||
}
|
||||
|
||||
// Backwards compatibility patch
|
||||
|
||||
// If there is only one part we want to duplicate that part for generating the path.
|
||||
if ($partsCount === 1) {
|
||||
// Generate the path based on the class name parts.
|
||||
$path = realpath($base . '/' . implode('/', array_map('strtolower', [$parts[0], $parts[0]])) . '.php');
|
||||
|
||||
// Load the file if it exists and is in the lookup path.
|
||||
if (strpos($path, realpath($base)) === 0 && is_file($path)) {
|
||||
$found = (bool) include_once $path;
|
||||
|
||||
if ($found) {
|
||||
self::loadAliasFor($class);
|
||||
}
|
||||
|
||||
return $found;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
return false;
|
||||
}
|
||||
|
||||
/**
|
||||
* Loads the aliases for the given class.
|
||||
*
|
||||
* @param string $class The class.
|
||||
*
|
||||
* @return void
|
||||
*
|
||||
* @since 3.8.0
|
||||
*/
|
||||
private static function loadAliasFor($class)
|
||||
{
|
||||
if (!array_key_exists($class, self::$classAliasesInverse)) {
|
||||
return;
|
||||
}
|
||||
|
||||
foreach (self::$classAliasesInverse[$class] as $alias) {
|
||||
// Force auto-load of the alias class
|
||||
class_exists($alias, true);
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Strips the first backslash from the given class if present.
|
||||
*
|
||||
* @param string $class The class to strip the first prefix from.
|
||||
*
|
||||
* @return string The striped class name.
|
||||
*
|
||||
* @since 3.8.0
|
||||
*/
|
||||
private static function stripFirstBackslash($class)
|
||||
{
|
||||
return $class && $class[0] === '\\' ? substr($class, 1) : $class;
|
||||
}
|
||||
}
|
||||
|
||||
// Check if jexit is defined first (our unit tests mock this)
|
||||
if (!function_exists('jexit')) {
|
||||
/**
|
||||
* Global application exit.
|
||||
*
|
||||
* This function provides a single exit point for the platform.
|
||||
*
|
||||
* @param mixed $message Exit code or string. Defaults to zero.
|
||||
*
|
||||
* @return never
|
||||
*
|
||||
* @codeCoverageIgnore
|
||||
* @since 1.7.0
|
||||
*/
|
||||
function jexit($message = 0): never
|
||||
{
|
||||
exit($message);
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Intelligent file importer.
|
||||
*
|
||||
* @param string $path A dot syntax path.
|
||||
* @param string $base Search this directory for the class.
|
||||
*
|
||||
* @return boolean True on success.
|
||||
*
|
||||
* @since 1.7.0
|
||||
*
|
||||
* @deprecated 4.3 will be removed in 6.0
|
||||
* Classes should be autoloaded. Use JLoader::registerPrefix() or JLoader::registerNamespace() to
|
||||
* register an autoloader for your files.
|
||||
*/
|
||||
function jimport($path, $base = null)
|
||||
{
|
||||
return JLoader::import($path, $base);
|
||||
}
|
||||
Reference in New Issue
Block a user