AjaxDispatcher.php

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<?php
use MediaWiki\MediaWikiServices;
 
// Use superglobals, but since it's deprecated, it's not worth fixing
// phpcs:disable MediaWiki.Usage.SuperGlobalsUsage.SuperGlobals
 
class AjaxDispatcher {
    private $mode;
 
    private $func_name;
 
    private $args;
 
    private $config;
 
    public function __construct( Config $config ) {
        $this->config = $config;
 
        $this->mode = "";
 
        if ( !empty( $_GET["rs"] ) ) {
            $this->mode = "get";
        }
 
        if ( !empty( $_POST["rs"] ) ) {
            $this->mode = "post";
        }
 
        switch ( $this->mode ) {
            case 'get':
                $this->func_name = $_GET["rs"] ?? '';
                if ( !empty( $_GET["rsargs"] ) ) {
                    $this->args = $_GET["rsargs"];
                } else {
                    $this->args = [];
                }
                break;
            case 'post':
                $this->func_name = $_POST["rs"] ?? '';
                if ( !empty( $_POST["rsargs"] ) ) {
                    $this->args = $_POST["rsargs"];
                } else {
                    $this->args = [];
                }
                break;
            default:
                return;
                # Or we could throw an exception:
                # throw new MWException( __METHOD__ . ' called without any data (mode empty).' );
        }
    }
 
    public function performAction( User $user ) {
        if ( empty( $this->mode ) ) {
            return;
        }
 
        $permissionManager = MediaWikiServices::getInstance()->getPermissionManager();
        if ( !in_array( $this->func_name, $this->config->get( 'AjaxExportList' ) ) ) {
            wfDebug( __METHOD__ . ' Bad Request for unknown function ' . $this->func_name );
            wfHttpError(
                400,
                'Bad Request',
                "unknown function " . $this->func_name
            );
        } elseif ( !$permissionManager->isEveryoneAllowed( 'read' ) &&
            !$permissionManager->userHasRight( $user, 'read' )
        ) {
            wfHttpError(
                403,
                'Forbidden',
                'You are not allowed to view pages.' );
        } else {
            wfDebug( __METHOD__ . ' dispatching ' . $this->func_name );
            try {
                $result = call_user_func_array( $this->func_name, $this->args );
 
                if ( $result === false || $result === null ) {
                    wfDebug( __METHOD__ . ' ERROR while dispatching ' .
                        $this->func_name . "(" . var_export( $this->args, true ) . "): " .
                        "no data returned" );
 
                    wfHttpError( 500, 'Internal Error',
                        "{$this->func_name} returned no data" );
                } else {
                    if ( is_string( $result ) ) {
                        $result = new AjaxResponse( $result );
                    }
 
                    // Make sure DB commit succeeds before sending a response
                    $lbFactory = MediaWikiServices::getInstance()->getDBLoadBalancerFactory();
                    $lbFactory->commitPrimaryChanges( __METHOD__ );
 
                    $result->sendHeaders();
                    $result->printText();
 
                    wfDebug( __METHOD__ . ' dispatch complete for ' . $this->func_name );
                }
            } catch ( Exception $e ) {
                wfDebug( __METHOD__ . ' ERROR while dispatching ' .
                    $this->func_name . "(" . var_export( $this->args, true ) . "): " .
                    get_class( $e ) . ": " . $e->getMessage() );
 
                if ( !headers_sent() ) {
                    wfHttpError( 500, 'Internal Error',
                        $e->getMessage() );
                } else {
                    print $e->getMessage();
                }
            }
        }
    }
}