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<?php
declare(strict_types=1);
/**
* Vonage Nexmo Bridge
*
* @copyright Copyright (c) 2020 Vonage, Inc. (http://vonage.com)
* @license https://github.com/nexmo/vonage-php-nexmo-bridge/blob/master/LICENSE MIT License
*/
namespace Vonage\NexmoBridge;
use \ArrayObject;
use Closure;
use Composer\Autoload\ClassLoader;
use \RuntimeException;
/**
* Alias legacy Nexmo classes/interfaces/traits to Vonage equivalents.
*/
class Autoloader
{
/**
* Attach autoloaders for managing legacy Nexmo artifacts.
*
* We attach two autoloaders:
*
* - The first is _prepended_ to handle new classes and add aliases for
* legacy classes. PHP expects any interfaces implemented, classes
* extended, or traits used when declaring class_alias() to exist and/or
* be autoloadable already at the time of declaration. If not, it will
* raise a fatal error. This autoloader helps mitigate errors in such
* situations.
*
* - The second is _appended_ in order to create aliases for legacy
* classes.
*/
/**
* @var array<string, string>
*/
protected static $namespaces = ['Nexmo\\' => 'Vonage\\'];
/**
* @var array<string, string>
*/
protected static $namespacesReversed = ['Vonage\\' => 'Nexmo\\'];
public static function load() : void
{
$loaded = new ArrayObject([]);
spl_autoload_register(self::createPrependAutoloader(
static::$namespacesReversed,
self::getClassLoader(),
$loaded
), true, true);
spl_autoload_register(self::createAppendAutoloader(
static::$namespaces,
$loaded
));
}
/**
* @throws RuntimeException
*/
private static function getClassLoader() : ClassLoader
{
if (getenv('COMPOSER_VENDOR_DIR') !== false && file_exists(getenv('COMPOSER_VENDOR_DIR') . '/autoload.php')) {
return include getenv('COMPOSER_VENDOR_DIR') . '/autoload.php';
}
if (file_exists(__DIR__ . '/../../../autoload.php')) {
return include __DIR__ . '/../../../autoload.php';
}
if (file_exists(__DIR__ . '/../vendor/autoload.php')) {
return include __DIR__ . '/../vendor/autoload.php';
}
throw new RuntimeException('Cannot detect composer autoload. Please run composer install');
}
/**
* @param array<string, string> $namespaces Namespaces to flip between
* @return Closure(string): void
*/
private static function createPrependAutoloader(
array $namespaces,
ClassLoader $classLoader,
ArrayObject $loaded
) : Closure {
/**
* @param string $class Class name to autoload
* @return void
*/
return static function (string $class) use ($namespaces, $classLoader, $loaded) : void {
if (isset($loaded[$class])) {
return;
}
$segments = explode('\\', $class);
$i = 0;
$check = '';
while (isset($segments[$i + 1], $namespaces[$check . $segments[$i] . '\\'])) {
$check .= $segments[$i] . '\\';
++$i;
}
if ($check === '') {
return;
}
if ($classLoader->loadClass($class)) {
$legacy = $namespaces[$check]
. strtr(substr($class, strlen($check)), [
'Vonage' => 'Nexmo',
]);
class_alias($class, $legacy);
}
};
}
/**
* @param array<string, string> $namespaces Namespaces to flip between
* @return Closure(string): void
*/
private static function createAppendAutoloader(array $namespaces, ArrayObject $loaded) : Closure
{
/**
* @param string $class Class name to autoload
* @return void
*/
return static function (string $class) use ($namespaces, $loaded) : void {
$segments = explode('\\', $class);
$i = 0;
$check = '';
// We are checking segments of the namespace to match quicker
while (isset($segments[$i + 1], $namespaces[$check . $segments[$i] . '\\'])) {
$check .= $segments[$i] . '\\';
++$i;
}
if ($check === '') {
return;
}
$alias = $namespaces[$check]
. strtr(substr($class, strlen($check)), [
'Nexmo' => 'Vonage',
]);
$loaded[$alias] = true;
if (class_exists($alias) || interface_exists($alias) || trait_exists($alias)) {
class_alias($alias, $class);
}
};
}
}
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