FetchAuthKeysTask.php

<?php
 
/*
 *
 *  ____            _        _   __  __ _                  __  __ ____
 * |  _ \ ___   ___| | _____| |_|  \/  (_)_ __   ___      |  \/  |  _ \
 * | |_) / _ \ / __| |/ / _ \ __| |\/| | | '_ \ / _ \_____| |\/| | |_) |
 * |  __/ (_) | (__|   <  __/ |_| |  | | | | | |  __/_____| |  | |  __/
 * |_|   \___/ \___|_|\_\___|\__|_|  |_|_|_| |_|\___|     |_|  |_|_|
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * @author PocketMine Team
 * @link http://www.pocketmine.net/
 *
 *
 */
 
declare(strict_types=1);
 
namespace pocketmine\network\mcpe\auth;
 
use pocketmine\network\mcpe\protocol\ProtocolInfo;
use pocketmine\network\mcpe\protocol\types\login\openid\api\AuthServiceKey;
use pocketmine\network\mcpe\protocol\types\login\openid\api\AuthServiceOpenIdConfiguration;
use pocketmine\network\mcpe\protocol\types\login\openid\api\MinecraftServicesDiscovery;
use pocketmine\scheduler\AsyncTask;
use pocketmine\thread\NonThreadSafeValue;
use pocketmine\utils\Internet;
use pocketmine\utils\InternetException;
use pocketmine\utils\InternetRequestResult;
use function gettype;
use function is_array;
use function is_object;
use function json_decode;
use const JSON_THROW_ON_ERROR;
 
class FetchAuthKeysTask extends AsyncTask{
    private const KEYS_ON_COMPLETION = "completion";
 
    private const MINECRAFT_SERVICES_DISCOVERY_URL = "https://client.discovery.minecraft-services.net/api/v1.0/discovery/MinecraftPE/builds/" . ProtocolInfo::MINECRAFT_VERSION_NETWORK;
    private const AUTHORIZATION_SERVICE_URI_FALLBACK = "https://authorization.franchise.minecraft-services.net";
    private const AUTHORIZATION_SERVICE_OPENID_CONFIGURATION_PATH = "/.well-known/openid-configuration";
    private const AUTHORIZATION_SERVICE_KEYS_PATH = "/.well-known/keys";
 
    private ?NonThreadSafeValue $keys = null;
    private string $issuer;
 
    private ?NonThreadSafeValue $errors = null;
 
    public function __construct(
        \Closure $onCompletion
    ){
        $this->storeLocal(self::KEYS_ON_COMPLETION, $onCompletion);
    }
 
    public function onRun() : void{
        $errors = [];
 
        try{
            $authServiceUri = $this->getAuthServiceURI();
        }catch(\RuntimeException $e){
            $errors[] = $e->getMessage();
            $authServiceUri = self::AUTHORIZATION_SERVICE_URI_FALLBACK;
        }
 
        try {
            $openIdConfig = $this->getOpenIdConfiguration($authServiceUri);
            $jwksUri = $openIdConfig->jwks_uri;
 
            $this->issuer = $openIdConfig->issuer;
        } catch (\RuntimeException $e) {
            $errors[] = $e->getMessage();
            $jwksUri = $authServiceUri . self::AUTHORIZATION_SERVICE_KEYS_PATH;
 
            $this->issuer = $authServiceUri;
        }
 
        try{
            $this->keys = new NonThreadSafeValue($this->getKeys($jwksUri));
        }catch(\RuntimeException $e){
            $errors[] = $e->getMessage();
        }
 
        $this->errors = $errors === [] ? null : new NonThreadSafeValue($errors);
    }
 
    private static function fetchURL(string $url, int $expectedCode) : InternetRequestResult{
        try{
            $result = Internet::simpleCurl($url);
            if($result->getCode() !== $expectedCode){
                throw new \RuntimeException("Unexpected HTTP response code accessing \"$url\": " . $result->getCode());
            }
            return $result;
        }catch(InternetException $e){
            throw new \RuntimeException("Failed accessing \"$url\": " . $e->getMessage(), 0, $e);
        }
    }
 
    private function getAuthServiceURI() : string{
        $result = self::fetchURL(self::MINECRAFT_SERVICES_DISCOVERY_URL, 200);
        try{
            $json = json_decode($result->getBody(), false, flags: JSON_THROW_ON_ERROR);
        }catch(\JsonException $e){
            throw new \RuntimeException($e->getMessage(), 0, $e);
        }
        if(!is_object($json)){
            throw new \RuntimeException("Unexpected root type of schema file " . gettype($json) . ", expected object");
        }
 
        $mapper = new \JsonMapper();
        $mapper->bExceptionOnUndefinedProperty = false; //we only care about the properties we're using in this case
        $mapper->bExceptionOnMissingData = true;
        $mapper->bStrictObjectTypeChecking = true;
        $mapper->bEnforceMapType = false;
        $mapper->bRemoveUndefinedAttributes = true;
        try{
            $discovery = $mapper->map($json, new MinecraftServicesDiscovery());
        }catch(\JsonMapper_Exception $e){
            throw new \RuntimeException("Invalid schema file: " . $e->getMessage(), 0, $e);
        }
 
        return $discovery->result->serviceEnvironments->auth->prod->serviceUri;
    }
 
    private function getOpenIdConfiguration(string $authServiceUri) : AuthServiceOpenIdConfiguration{
        $result = self::fetchURL($authServiceUri . self::AUTHORIZATION_SERVICE_OPENID_CONFIGURATION_PATH, 200);
 
        try{
            $json = json_decode($result->getBody(), false, flags: JSON_THROW_ON_ERROR);
        }catch(\JsonException $e){
            throw new \RuntimeException($e->getMessage(), 0, $e);
        }
        if(!is_object($json)){
            throw new \RuntimeException("Unexpected root type of schema file " . gettype($json) . ", expected object");
        }
 
        $mapper = new \JsonMapper();
        $mapper->bExceptionOnUndefinedProperty = false; //we only care about the properties we're using in this case
        $mapper->bExceptionOnMissingData = true;
        $mapper->bStrictObjectTypeChecking = true;
        $mapper->bEnforceMapType = false;
        $mapper->bRemoveUndefinedAttributes = true;
        try{
            $configuration = $mapper->map($json, new AuthServiceOpenIdConfiguration());
        }catch(\JsonMapper_Exception $e){
            throw new \RuntimeException("Invalid schema file: " . $e->getMessage(), 0, $e);
        }
 
        return $configuration;
    }
 
    private function getKeys(string $jwksUri) : array{
        $result = self::fetchURL($jwksUri, 200);
 
        try{
            $json = json_decode($result->getBody(), true, flags: JSON_THROW_ON_ERROR);
        }catch(\JsonException $e){
            throw new \RuntimeException($e->getMessage(), 0, $e);
        }
 
        if(!is_array($json) || !isset($json["keys"]) || !is_array($keysArray = $json["keys"])){
            throw new \RuntimeException("Unexpected root type of schema file " . gettype($json) . ", expected object");
        }
 
        $mapper = new \JsonMapper();
        $mapper->bExceptionOnUndefinedProperty = true;
        $mapper->bExceptionOnMissingData = true;
        $mapper->bStrictObjectTypeChecking = true;
        $mapper->bEnforceMapType = false;
        $mapper->bRemoveUndefinedAttributes = true;
 
        $keys = [];
        foreach($keysArray as $keyJson){
            if(!is_array($keyJson)){
                throw new \RuntimeException("Unexpected key type in schema file: " . gettype($keyJson) . ", expected object");
            }
 
            try{
                $key = $mapper->map($keyJson, new AuthServiceKey());
                $keys[$key->kid] = $key;
            }catch(\JsonMapper_Exception $e){
                throw new \RuntimeException("Invalid schema file: " . $e->getMessage(), 0, $e);
            }
        }
 
        return $keys;
    }
 
    public function onCompletion() : void{
        $callback = $this->fetchLocal(self::KEYS_ON_COMPLETION);
        $callback($this->keys?->deserialize(), $this->issuer, $this->errors?->deserialize());
    }
}