<?php

/**

 * Autoloader for Requests for PHP.

 *

 * Include this file if you'd like to avoid having to create your own autoloader.

 *

 * @package Requests

 * @since   2.0.0

 *

 * @codeCoverageIgnore

 */

namespace WpOrg\Requests;

/*

 * Ensure the autoloader is only declared once.

 * This safeguard is in place as this is the typical entry point for this library

 * and this file being required unconditionally could easily cause

 * fatal "Class already declared" errors.

 */

if (class_exists('WpOrg\Requests\Autoload') === false) {

	/**

	 * Autoloader for Requests for PHP.

	 *

	 * This autoloader supports the PSR-4 based Requests 2.0.0 classes in a case-sensitive manner

	 * as the most common server OS-es are case-sensitive and the file names are in mixed case.

	 *

	 * For the PSR-0 Requests 1.x BC-layer, requested classes will be treated case-insensitively.

	 *

	 * @package Requests

	 */

	final class Autoload {

		/**

		 * List of the old PSR-0 class names in lowercase as keys with their PSR-4 case-sensitive name as a value.

		 *

		 * @var array

		 */

		private static $deprecated_classes = [

			// Interfaces.

			'requests_auth'                              => '\WpOrg\Requests\Auth',

			'requests_hooker'                            => '\WpOrg\Requests\HookManager',

			'requests_proxy'                             => '\WpOrg\Requests\Proxy',

			'requests_transport'                         => '\WpOrg\Requests\Transport',

			// Classes.

			'requests_cookie'                            => '\WpOrg\Requests\Cookie',

			'requests_exception'                         => '\WpOrg\Requests\Exception',

			'requests_hooks'                             => '\WpOrg\Requests\Hooks',

			'requests_idnaencoder'                       => '\WpOrg\Requests\IdnaEncoder',

			'requests_ipv6'                              => '\WpOrg\Requests\Ipv6',

			'requests_iri'                               => '\WpOrg\Requests\Iri',

			'requests_response'                          => '\WpOrg\Requests\Response',

			'requests_session'                           => '\WpOrg\Requests\Session',

			'requests_ssl'                               => '\WpOrg\Requests\Ssl',

			'requests_auth_basic'                        => '\WpOrg\Requests\Auth\Basic',

			'requests_cookie_jar'                        => '\WpOrg\Requests\Cookie\Jar',

			'requests_proxy_http'                        => '\WpOrg\Requests\Proxy\Http',

			'requests_response_headers'                  => '\WpOrg\Requests\Response\Headers',

			'requests_transport_curl'                    => '\WpOrg\Requests\Transport\Curl',

			'requests_transport_fsockopen'               => '\WpOrg\Requests\Transport\Fsockopen',

			'requests_utility_caseinsensitivedictionary' => '\WpOrg\Requests\Utility\CaseInsensitiveDictionary',

			'requests_utility_filterediterator'          => '\WpOrg\Requests\Utility\FilteredIterator',

			'requests_exception_http'                    => '\WpOrg\Requests\Exception\Http',

			'requests_exception_transport'               => '\WpOrg\Requests\Exception\Transport',

			'requests_exception_transport_curl'          => '\WpOrg\Requests\Exception\Transport\Curl',

			'requests_exception_http_304'                => '\WpOrg\Requests\Exception\Http\Status304',

			'requests_exception_http_305'                => '\WpOrg\Requests\Exception\Http\Status305',

			'requests_exception_http_306'                => '\WpOrg\Requests\Exception\Http\Status306',

			'requests_exception_http_400'                => '\WpOrg\Requests\Exception\Http\Status400',

			'requests_exception_http_401'                => '\WpOrg\Requests\Exception\Http\Status401',

			'requests_exception_http_402'                => '\WpOrg\Requests\Exception\Http\Status402',

			'requests_exception_http_403'                => '\WpOrg\Requests\Exception\Http\Status403',

			'requests_exception_http_404'                => '\WpOrg\Requests\Exception\Http\Status404',

			'requests_exception_http_405'                => '\WpOrg\Requests\Exception\Http\Status405',

			'requests_exception_http_406'                => '\WpOrg\Requests\Exception\Http\Status406',

			'requests_exception_http_407'                => '\WpOrg\Requests\Exception\Http\Status407',

			'requests_exception_http_408'                => '\WpOrg\Requests\Exception\Http\Status408',

			'requests_exception_http_409'                => '\WpOrg\Requests\Exception\Http\Status409',

			'requests_exception_http_410'                => '\WpOrg\Requests\Exception\Http\Status410',

			'requests_exception_http_411'                => '\WpOrg\Requests\Exception\Http\Status411',

			'requests_exception_http_412'                => '\WpOrg\Requests\Exception\Http\Status412',

			'requests_exception_http_413'                => '\WpOrg\Requests\Exception\Http\Status413',

			'requests_exception_http_414'                => '\WpOrg\Requests\Exception\Http\Status414',

			'requests_exception_http_415'                => '\WpOrg\Requests\Exception\Http\Status415',

			'requests_exception_http_416'                => '\WpOrg\Requests\Exception\Http\Status416',

			'requests_exception_http_417'                => '\WpOrg\Requests\Exception\Http\Status417',

			'requests_exception_http_418'                => '\WpOrg\Requests\Exception\Http\Status418',

			'requests_exception_http_428'                => '\WpOrg\Requests\Exception\Http\Status428',

			'requests_exception_http_429'                => '\WpOrg\Requests\Exception\Http\Status429',

			'requests_exception_http_431'                => '\WpOrg\Requests\Exception\Http\Status431',

			'requests_exception_http_500'                => '\WpOrg\Requests\Exception\Http\Status500',

			'requests_exception_http_501'                => '\WpOrg\Requests\Exception\Http\Status501',

			'requests_exception_http_502'                => '\WpOrg\Requests\Exception\Http\Status502',

			'requests_exception_http_503'                => '\WpOrg\Requests\Exception\Http\Status503',

			'requests_exception_http_504'                => '\WpOrg\Requests\Exception\Http\Status504',

			'requests_exception_http_505'                => '\WpOrg\Requests\Exception\Http\Status505',

			'requests_exception_http_511'                => '\WpOrg\Requests\Exception\Http\Status511',

			'requests_exception_http_unknown'            => '\WpOrg\Requests\Exception\Http\StatusUnknown',

		];

		/**

		 * Register the autoloader.

		 *

		 * Note: the autoloader is *prepended* in the autoload queue.

		 * This is done to ensure that the Requests 2.0 autoloader takes precedence

		 * over a potentially (dependency-registered) Requests 1.x autoloader.

		 *

		 * @internal This method contains a safeguard against the autoloader being

		 * registered multiple times. This safeguard uses a global constant to

		 * (hopefully/in most cases) still function correctly, even if the

		 * class would be renamed.

		 *

		 * @return void

		 */

		public static function register() {

			if (defined('REQUESTS_AUTOLOAD_REGISTERED') === false) {

				spl_autoload_register([self::class, 'load'], true);

				define('REQUESTS_AUTOLOAD_REGISTERED', true);

			}

		}

		/**

		 * Autoloader.

		 *

		 * @param string $class_name Name of the class name to load.

		 *

		 * @return bool Whether a class was loaded or not.

		 */

		public static function load($class_name) {

			// Check that the class starts with "Requests" (PSR-0) or "WpOrg\Requests" (PSR-4).

			$psr_4_prefix_pos = strpos($class_name, 'WpOrg\\Requests\\');

			if (stripos($class_name, 'Requests') !== 0 && $psr_4_prefix_pos !== 0) {

				return false;

			}

			$class_lower = strtolower($class_name);

			if ($class_lower === 'requests') {

				// Reference to the original PSR-0 Requests class.

				$file = dirname(__DIR__) . '/library/Requests.php';

			} elseif ($psr_4_prefix_pos === 0) {

				// PSR-4 classname.

				$file = __DIR__ . '/' . strtr(substr($class_name, 15), '\\', '/') . '.php';

			}

			if (isset($file) && file_exists($file)) {

				include $file;

				return true;

			}

			/*

			 * Okay, so the class starts with "Requests", but we couldn't find the file.

			 * If this is one of the deprecated/renamed PSR-0 classes being requested,

			 * let's alias it to the new name and throw a deprecation notice.

			 */

			if (isset(self::$deprecated_classes[$class_lower])) {

				/*

				 * Integrators who cannot yet upgrade to the PSR-4 class names can silence deprecations

				 * by defining a `REQUESTS_SILENCE_PSR0_DEPRECATIONS` constant and setting it to `true`.

				 * The constant needs to be defined before the first deprecated class is requested

				 * via this autoloader.

				 */

				if (!defined('REQUESTS_SILENCE_PSR0_DEPRECATIONS') || REQUESTS_SILENCE_PSR0_DEPRECATIONS !== true) {

					// phpcs:ignore WordPress.PHP.DevelopmentFunctions.error_log_trigger_error

					trigger_error(

						'The PSR-0 `Requests_...` class names in the Requests library are deprecated.'

						. ' Switch to the PSR-4 `WpOrg\Requests\...` class names at your earliest convenience.',

						E_USER_DEPRECATED

					);

					// Prevent the deprecation notice from being thrown twice.

					if (!defined('REQUESTS_SILENCE_PSR0_DEPRECATIONS')) {

						define('REQUESTS_SILENCE_PSR0_DEPRECATIONS', true);

					}

				}

				// Create an alias and let the autoloader recursively kick in to load the PSR-4 class.

				return class_alias(self::$deprecated_classes[$class_lower], $class_name, true);

			}

			return false;

		}

	}

}