SpecialRunJobs.php

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<?php
use MediaWiki\Logger\LoggerFactory;

class SpecialRunJobs extends UnlistedSpecialPage {
    public function __construct() {
        parent::__construct( 'RunJobs' );
    }

    public function doesWrites() {
        return true;
    }

    public function execute( $par = '' ) {
        $this->getOutput()->disable();

        if ( wfReadOnly() ) {
            wfHttpError( 423, 'Locked', 'Wiki is in read-only mode.' );
            return;
        }

        // Validate request method
        if ( !$this->getRequest()->wasPosted() ) {
            wfHttpError( 400, 'Bad Request', 'Request must be POSTed.' );
            return;
        }

        // Validate request parameters
        $optional = [ 'maxjobs' => 0, 'maxtime' => 30, 'type' => false,
            'async' => true, 'stats' => false ];
        $required = array_flip( [ 'title', 'tasks', 'signature', 'sigexpiry' ] );
        $params = array_intersect_key( $this->getRequest()->getValues(), $required + $optional );
        $missing = array_diff_key( $required, $params );
        if ( count( $missing ) ) {
            wfHttpError( 400, 'Bad Request',
                'Missing parameters: ' . implode( ', ', array_keys( $missing ) )
            );
            return;
        }

        // Validate request signature
        $squery = $params;
        unset( $squery['signature'] );
        $correctSignature = self::getQuerySignature( $squery, $this->getConfig()->get( 'SecretKey' ) );
        $providedSignature = $params['signature'];
        $verified = is_string( $providedSignature )
            && hash_equals( $correctSignature, $providedSignature );
        if ( !$verified || $params['sigexpiry'] < time() ) {
            wfHttpError( 400, 'Bad Request', 'Invalid or stale signature provided.' );
            return;
        }

        // Apply any default parameter values
        $params += $optional;

        if ( $params['async'] ) {
            // HTTP 202 Accepted
            HttpStatus::header( 202 );
            // Clients are meant to disconnect without waiting for the full response.
            // Let the page output happen before the jobs start, so that clients know it's
            // safe to disconnect. MediaWiki::preOutputCommit() calls ignore_user_abort()
            // or similar to make sure we stay alive to run the deferred update.
            DeferredUpdates::addUpdate(
                new TransactionRoundDefiningUpdate(
                    function () use ( $params ) {
                        $this->doRun( $params );
                    },
                    __METHOD__
                ),
                DeferredUpdates::POSTSEND
            );
        } else {
            $stats = $this->doRun( $params );

            if ( $params['stats'] ) {
                $this->getRequest()->response()->header( 'Content-Type: application/json' );
                print FormatJson::encode( $stats );
            } else {
                print "Done\n";
            }
        }
    }

    protected function doRun( array $params ) {
        $runner = new JobRunner( LoggerFactory::getInstance( 'runJobs' ) );
        return $runner->run( [
            'type'     => $params['type'],
            'maxJobs'  => $params['maxjobs'] ?: 1,
            'maxTime'  => $params['maxtime'] ?: 30
        ] );
    }

    public static function getQuerySignature( array $query, $secretKey ) {
        ksort( $query ); // stable order
        return hash_hmac( 'sha1', wfArrayToCgi( $query ), $secretKey );
    }
}