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<?php
/**
* @package Joomla.Platform
*
* @copyright Copyright (C) 2005 - 2019 Open Source Matters, Inc. All rights reserved.
* @license GNU General Public License version 2 or later; see LICENSE.txt
*/
defined('JPATH_PLATFORM') or die;
/**
* Static class to handle loading of libraries.
*
* @package Joomla.Platform
* @since 1.7.0
*/
abstract class JLoader
{
/**
* Container for already imported library paths.
*
* @var array
* @since 1.7.0
*/
protected static $classes = array();
/**
* Container for already imported library paths.
*
* @var array
* @since 1.7.0
*/
protected static $imported = array();
/**
* Container for registered library class prefixes and path lookups.
*
* @var array
* @since 3.0.0
*/
protected static $prefixes = array();
/**
* Holds proxy classes and the class names the proxy.
*
* @var array
* @since 3.2
*/
protected static $classAliases = array();
/**
* Holds the inverse lookup for proxy classes and the class names the proxy.
*
* @var array
* @since 3.4
*/
protected static $classAliasesInverse = array();
/**
* Container for namespace => path map.
*
* @var array
* @since 3.1.4
*/
protected static $namespaces = array('psr0' => array(), 'psr4' => array());
/**
* Holds a reference for all deprecated aliases (mainly for use by a logging platform).
*
* @var array
* @since 3.6.3
*/
protected static $deprecatedAliases = array();
/**
* Method to discover classes of a given type in a given path.
*
* @param string $classPrefix The class name prefix to use for discovery.
* @param string $parentPath Full path to the parent folder for the classes to discover.
* @param boolean $force True to overwrite the autoload path value for the class if it already exists.
* @param boolean $recurse Recurse through all child directories as well as the parent path.
*
* @return void
*
* @since 1.7.0
*/
public static function discover($classPrefix, $parentPath, $force = true, $recurse = false)
{
try
{
if ($recurse)
{
$iterator = new RecursiveIteratorIterator(
new RecursiveDirectoryIterator($parentPath),
RecursiveIteratorIterator::SELF_FIRST
);
}
else
{
$iterator = new DirectoryIterator($parentPath);
}
/** @type $file DirectoryIterator */
foreach ($iterator as $file)
{
$fileName = $file->getFilename();
// Only load for php files.
if ($file->isFile() && $file->getExtension() === 'php')
{
// Get the class name and full path for each file.
$class = strtolower($classPrefix . preg_replace('#\.php$#', '', $fileName));
// Register the class with the autoloader if not already registered or the force flag is set.
if ($force || empty(self::$classes[$class]))
{
self::register($class, $file->getPath() . '/' . $fileName);
}
}
}
}
catch (UnexpectedValueException $e)
{
// Exception will be thrown if the path is not a directory. Ignore it.
}
}
/**
* Method to get the list of registered classes and their respective file paths for the autoloader.
*
* @return array The array of class => path values for the autoloader.
*
* @since 1.7.0
*/
public static function getClassList()
{
return self::$classes;
}
/**
* Method to get the list of deprecated class aliases.
*
* @return array An associative array with deprecated class alias data.
*
* @since 3.6.3
*/
public static function getDeprecatedAliases()
{
return self::$deprecatedAliases;
}
/**
* Method to get the list of registered namespaces.
*
* @param string $type Defines the type of namespace, can be prs0 or psr4.
*
* @return array The array of namespace => path values for the autoloader.
*
* @since 3.1.4
*/
public static function getNamespaces($type = 'psr0')
{
if ($type !== 'psr0' && $type !== 'psr4')
{
throw new InvalidArgumentException('Type needs to be prs0 or psr4!');
}
return self::$namespaces[$type];
}
/**
* Loads a class from specified directories.
*
* @param string $key The class name to look for (dot notation).
* @param string $base Search this directory for the class.
*
* @return boolean True on success.
*
* @since 1.7.0
*/
public static function import($key, $base = null)
{
// Only import the library if not already attempted.
if (!isset(self::$imported[$key]))
{
// Setup some variables.
$success = false;
$parts = explode('.', $key);
$class = array_pop($parts);
$base = (!empty($base)) ? $base : __DIR__;
$path = str_replace('.', DIRECTORY_SEPARATOR, $key);
// Handle special case for helper classes.
if ($class === 'helper')
{
$class = ucfirst(array_pop($parts)) . ucfirst($class);
}
// Standard class.
else
{
$class = ucfirst($class);
}
// If we are importing a library from the Joomla namespace set the class to autoload.
if (strpos($path, 'joomla') === 0)
{
// Since we are in the Joomla namespace prepend the classname with J.
$class = 'J' . $class;
// Only register the class for autoloading if the file exists.
if (is_file($base . '/' . $path . '.php'))
{
self::$classes[strtolower($class)] = $base . '/' . $path . '.php';
$success = true;
}
}
/*
* If we are not importing a library from the Joomla namespace directly include the
* file since we cannot assert the file/folder naming conventions.
*/
else
{
// If the file exists attempt to include it.
if (is_file($base . '/' . $path . '.php'))
{
$success = (bool) include_once $base . '/' . $path . '.php';
}
}
// Add the import key to the memory cache container.
self::$imported[$key] = $success;
}
return self::$imported[$key];
}
/**
* Load the file for a class.
*
* @param string $class The class to be loaded.
*
* @return boolean True on success
*
* @since 1.7.0
*/
public static function load($class)
{
// Sanitize class name.
$key = strtolower($class);
// If the class already exists do nothing.
if (class_exists($class, false))
{
return true;
}
// If the class is registered include the file.
if (isset(self::$classes[$key]))
{
$found = (bool) include_once self::$classes[$key];
if ($found)
{
self::loadAliasFor($class);
}
// If the class doesn't exists, we probably have a class alias available
if (!class_exists($class, false))
{
// Search the alias class, first none namespaced and then namespaced
$original = array_search($class, self::$classAliases) ? : array_search('\\' . $class, self::$classAliases);
// When we have an original and the class exists an alias should be created
if ($original && class_exists($original, false))
{
class_alias($original, $class);
}
}
return true;
}
return false;
}
/**
* Directly register a class to the autoload list.
*
* @param string $class The class name to register.
* @param string $path Full path to the file that holds the class to register.
* @param boolean $force True to overwrite the autoload path value for the class if it already exists.
*
* @return void
*
* @since 1.7.0
*/
public static function register($class, $path, $force = true)
{
// When an alias exists, register it as well
if (key_exists(strtolower($class), self::$classAliases))
{
self::register(self::stripFirstBackslash(self::$classAliases[strtolower($class)]), $path, $force);
}
// Sanitize class name.
$class = strtolower($class);
// Only attempt to register the class if the name and file exist.
if (!empty($class) && is_file($path))
{
// Register the class with the autoloader if not already registered or the force flag is set.
if ($force || empty(self::$classes[$class]))
{
self::$classes[$class] = $path;
}
}
}
/**
* Register a class prefix with lookup path. This will allow developers to register library
* packages with different class prefixes to the system autoloader. More than one lookup path
* may be registered for the same class prefix, but if this method is called with the reset flag
* set to true then any registered lookups for the given prefix will be overwritten with the current
* lookup path. When loaded, prefix paths are searched in a "last in, first out" order.
*
* @param string $prefix The class prefix to register.
* @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 $prepend If true, push the path to the beginning of the prefix lookup paths array.
*
* @return void
*
* @throws RuntimeException
*
* @since 3.0.0
*/
public static function registerPrefix($prefix, $path, $reset = false, $prepend = false)
{
// Verify the library path exists.
if (!file_exists($path))
{
$path = (str_replace(JPATH_ROOT, '', $path) == $path) ? basename($path) : str_replace(JPATH_ROOT, '', $path);
throw new RuntimeException('Library path ' . $path . ' cannot be found.', 500);
}
// If the prefix is not yet registered or we have an explicit reset flag then set set the path.
if ($reset || !isset(self::$prefixes[$prefix]))
{
self::$prefixes[$prefix] = array($path);
}
// Otherwise we want to simply add the path to the prefix.
else
{
if ($prepend)
{
array_unshift(self::$prefixes[$prefix], $path);
}
else
{
self::$prefixes[$prefix][] = $path;
}
}
}
/**
* 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 $version The version in which the alias will no longer be present.
*
* @return boolean True if registration was successful. False if the alias already exists.
*
* @since 3.2
*/
public static function registerAlias($alias, $original, $version = false)
{
// PHP is case insensitive so support all kind of alias combination
$lowercasedAlias = strtolower($alias);
if (!isset(self::$classAliases[$lowercasedAlias]))
{
self::$classAliases[$lowercasedAlias] = $original;
$original = self::stripFirstBackslash($original);
if (!isset(self::$classAliasesInverse[$original]))
{
self::$classAliasesInverse[$original] = array($lowercasedAlias);
}
else
{
self::$classAliasesInverse[$original][] = $lowercasedAlias;
}
// If given a version, log this alias as deprecated
if ($version)
{
self::$deprecatedAliases[] = array('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.
* @param string $type Defines the type of namespace, can be prs0 or psr4.
*
* @return void
*
* @throws RuntimeException
*
* @note The default argument of $type will be changed in J4 to be 'psr4'
* @since 3.1.4
*/
public static function registerNamespace($namespace, $path, $reset = false, $prepend = false, $type = 'psr0')
{
if ($type !== 'psr0' && $type !== 'psr4')
{
throw new InvalidArgumentException('Type needs to be prs0 or psr4!');
}
// Verify the library path exists.
if (!file_exists($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[$type][$namespace]))
{
self::$namespaces[$type][$namespace] = array($path);
}
// Otherwise we want to simply add the path to the namespace.
else
{
if ($prepend)
{
array_unshift(self::$namespaces[$type][$namespace], $path);
}
else
{
self::$namespaces[$type][$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(array('JLoader', 'load'));
}
if ($enablePrefixes)
{
// Register the J prefix and base path for Joomla platform libraries.
self::registerPrefix('J', JPATH_PLATFORM . '/joomla');
// Register the prefix autoloader.
spl_autoload_register(array('JLoader', '_autoload'));
}
if ($enablePsr)
{
// Register the PSR based autoloader.
spl_autoload_register(array('JLoader', 'loadByPsr0'));
spl_autoload_register(array('JLoader', 'loadByPsr4'));
spl_autoload_register(array('JLoader', 'loadByAlias'));
}
}
/**
* Method to autoload classes that are namespaced to the PSR-4 standard.
*
* @param string $class The fully qualified class name to autoload.
*
* @return boolean True on success, false otherwise.
*
* @since 3.7.0
*/
public static function loadByPsr4($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);
}
// If not, no need to parse path.
else
{
$classPath = null;
$className = $class;
}
$classPath .= $className . '.php';
// Loop through registered namespaces until we find a match.
foreach (self::$namespaces['psr4'] 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 (file_exists($classFilePath) && !class_exists($class, false))
{
$found = (bool) include_once $classFilePath;
if ($found)
{
self::loadAliasFor($class);
}
return $found;
}
}
}
}
return false;
}
/**
* Method to autoload classes that are namespaced to the PSR-0 standard.
*
* @param string $class The fully qualified class name to autoload.
*
* @return boolean True on success, false otherwise.
*
* @since 3.2.0
*
* @deprecated 4.0 this method will be removed
*/
public static function loadByPsr0($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);
}
// If not, no need to parse path.
else
{
$classPath = null;
$className = $class;
}
$classPath .= str_replace('_', DIRECTORY_SEPARATOR, $className) . '.php';
// Loop through registered namespaces until we find a match.
foreach (self::$namespaces['psr0'] as $ns => $paths)
{
if (strpos($class, $ns) === 0)
{
// Loop through paths registered to this namespace until we find a match.
foreach ($paths as $path)
{
$classFilePath = realpath($path . DIRECTORY_SEPARATOR . $classPath);
// We do not allow files outside the namespace root to be loaded
if (strpos($classFilePath, realpath($path)) !== 0)
{
continue;
}
// We check for class_exists to handle case-sensitive file systems
if (file_exists($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 $class The fully qualified class name to autoload.
*
* @return boolean True on success, false otherwise.
*
* @since 3.2
*/
public static function loadByAlias($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($base)) === 0 && file_exists($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', array($parts[0], $parts[0]))) . '.php');
// Load the file if it exists and is in the lookup path.
if (strpos($path, realpath($base)) === 0 && file_exists($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 (!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 $message Exit code or string. Defaults to zero.
*
* @return void
*
* @codeCoverageIgnore
* @since 1.7.0
*/
function jexit($message = 0)
{
exit($message);
}
}
/**
* Intelligent file importer.
*
* @param string $path A dot syntax path.
* @param string $base Search this directory for the class.
*
* @return boolean True on success.
*
* @since 1.7.0
*/
function jimport($path, $base = null)
{
return JLoader::import($path, $base);
}
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