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| 1 | <?php |
| 2 | |
| 3 | namespace MediaWiki\Extension\EventBus\Rest; |
| 4 | |
| 5 | use Exception; |
| 6 | use Job; |
| 7 | use MediaWiki\Extension\EventBus\EventBus; |
| 8 | use MediaWiki\Extension\EventBus\EventFactory; |
| 9 | use MediaWiki\MediaWikiServices; |
| 10 | use MediaWiki\Rest\HttpException; |
| 11 | use Psr\Log\LoggerInterface; |
| 12 | |
| 13 | /** |
| 14 | * Validates the body |
| 15 | */ |
| 16 | class EventBodyValidator { |
| 17 | |
| 18 | /** |
| 19 | * @var string |
| 20 | */ |
| 21 | private $secretKey; |
| 22 | |
| 23 | /** |
| 24 | * @var LoggerInterface |
| 25 | */ |
| 26 | private $logger; |
| 27 | |
| 28 | public function __construct( $secretKey, LoggerInterface $logger ) { |
| 29 | $this->secretKey = $secretKey; |
| 30 | $this->logger = $logger; |
| 31 | } |
| 32 | |
| 33 | public function validateEvent( array $event ): Job { |
| 34 | // check that we have the needed components of the event |
| 35 | if ( !isset( $event['database'] ) || |
| 36 | !isset( $event['type'] ) || |
| 37 | !isset( $event['params'] ) |
| 38 | ) { |
| 39 | $missingParams = []; |
| 40 | if ( !isset( $event['database'] ) ) { |
| 41 | $missingParams[] = 'database'; |
| 42 | } |
| 43 | if ( !isset( $event['type'] ) ) { |
| 44 | $missingParams[] = 'type'; |
| 45 | } |
| 46 | if ( !isset( $event['params'] ) ) { |
| 47 | $missingParams[] = 'params'; |
| 48 | } |
| 49 | throw new HttpException( 'Invalid event received', 400, [ 'missing_params' => $missingParams ] ); |
| 50 | } |
| 51 | |
| 52 | if ( !isset( $event['mediawiki_signature'] ) ) { |
| 53 | throw new HttpException( 'Missing mediawiki signature', 403 ); |
| 54 | } |
| 55 | |
| 56 | $signature = $event['mediawiki_signature']; |
| 57 | unset( $event['mediawiki_signature'] ); |
| 58 | |
| 59 | $serialized_event = EventBus::serializeEvents( $event ); |
| 60 | $expected_signature = EventFactory::getEventSignature( |
| 61 | $serialized_event, |
| 62 | $this->secretKey |
| 63 | ); |
| 64 | |
| 65 | $verified = is_string( $signature ) |
| 66 | && hash_equals( $expected_signature, $signature ); |
| 67 | |
| 68 | if ( !$verified ) { |
| 69 | throw new HttpException( 'Invalid mediawiki signature', 403 ); |
| 70 | } |
| 71 | |
| 72 | // check if there are any base64-encoded parameters and if so decode them |
| 73 | foreach ( $event['params'] as $key => &$value ) { |
| 74 | if ( !is_string( $value ) ) { |
| 75 | continue; |
| 76 | } |
| 77 | if ( preg_match( '/^data:application\/octet-stream;base64,([\s\S]+)$/', $value, $match ) ) { |
| 78 | $value = base64_decode( $match[1], true ); |
| 79 | if ( $value === false ) { |
| 80 | |
| 81 | throw new HttpException( |
| 82 | 'Parameter base64_decode() failed', |
| 83 | 500, |
| 84 | [ |
| 85 | 'param_name' => $key, |
| 86 | 'param_value' => $match[1] |
| 87 | ] |
| 88 | ); |
| 89 | } |
| 90 | } |
| 91 | } |
| 92 | unset( $value ); |
| 93 | |
| 94 | return $this->getJobFromParams( $event ); |
| 95 | } |
| 96 | |
| 97 | /** |
| 98 | * @param array $jobEvent containing the job EventBus event |
| 99 | * @return Job|void |
| 100 | * @throws HttpException |
| 101 | */ |
| 102 | private function getJobFromParams( array $jobEvent ) { |
| 103 | try { |
| 104 | $jobFactory = MediaWikiServices::getInstance()->getJobFactory(); |
| 105 | $job = $jobFactory->newJob( $jobEvent['type'], $jobEvent['params'] ); |
| 106 | } catch ( Exception $e ) { |
| 107 | $this->throwJobErrors( [ |
| 108 | 'status' => false, |
| 109 | 'error' => $e->getMessage(), |
| 110 | 'type' => $jobEvent['type'] |
| 111 | ] ); |
| 112 | } |
| 113 | |
| 114 | if ( $job === null ) { |
| 115 | $this->throwJobErrors( [ |
| 116 | 'status' => false, |
| 117 | 'error' => 'Could not create a job from event', |
| 118 | 'type' => $jobEvent['type'] |
| 119 | ] ); |
| 120 | } |
| 121 | |
| 122 | return $job; |
| 123 | } |
| 124 | |
| 125 | /** |
| 126 | * @param array $jobResults |
| 127 | * @throws HttpException |
| 128 | * @return never |
| 129 | */ |
| 130 | private function throwJobErrors( $jobResults ) { |
| 131 | $this->logger->error( 'Failed creating job from description', [ |
| 132 | 'job_type' => $jobResults['type'], |
| 133 | 'error' => $jobResults['error'] |
| 134 | ] ); |
| 135 | |
| 136 | throw new HttpException( "Failed creating job from description", |
| 137 | 400, |
| 138 | [ 'error' => $jobResults['error'] ] |
| 139 | ); |
| 140 | } |
| 141 | } |