AjaxDispatcher.php

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<?php
class AjaxDispatcher {
        private $mode;

        private $func_name;

        private $args;

        function __construct() {
                wfProfileIn( __METHOD__ );

                $this->mode = "";

                if ( ! empty( $_GET["rs"] ) ) {
                        $this->mode = "get";
                }

                if ( !empty( $_POST["rs"] ) ) {
                        $this->mode = "post";
                }

                switch( $this->mode ) {
                        case 'get':
                                $this->func_name = isset( $_GET["rs"] ) ? $_GET["rs"] : '';
                                if ( ! empty( $_GET["rsargs"] ) ) {
                                        $this->args = $_GET["rsargs"];
                                } else {
                                        $this->args = array();
                                }
                                break;
                        case 'post':
                                $this->func_name = isset( $_POST["rs"] ) ? $_POST["rs"] : '';
                                if ( ! empty( $_POST["rsargs"] ) ) {
                                        $this->args = $_POST["rsargs"];
                                } else {
                                        $this->args = array();
                                }
                                break;
                        default:
                                wfProfileOut( __METHOD__ );
                                return;
                                # Or we could throw an exception:
                                # throw new MWException( __METHOD__ . ' called without any data (mode empty).' );
                }

                wfProfileOut( __METHOD__ );
        }

        function performAction() {
                global $wgAjaxExportList, $wgOut, $wgUser;

                if ( empty( $this->mode ) ) {
                        return;
                }

                wfProfileIn( __METHOD__ );

                if ( ! in_array( $this->func_name, $wgAjaxExportList ) ) {
                        wfDebug( __METHOD__ . ' Bad Request for unknown function ' . $this->func_name . "\n" );

                        wfHttpError(
                                400,
                                'Bad Request',
                                "unknown function " . (string) $this->func_name
                        );
                } elseif ( !in_array( 'read', User::getGroupPermissions( array( '*' ) ), true ) 
                        && !$wgUser->isAllowed( 'read' ) )
                {
                        wfHttpError(
                                403,
                                'Forbidden',
                                'You must log in to view pages.' );
                } else {
                        wfDebug( __METHOD__ . ' dispatching ' . $this->func_name . "\n" );

                        if ( strpos( $this->func_name, '::' ) !== false ) {
                                $func = explode( '::', $this->func_name, 2 );
                        } else {
                                $func = $this->func_name;
                        }

                        try {
                                $result = call_user_func_array( $func, $this->args );

                                if ( $result === false || $result === null ) {
                                        wfDebug( __METHOD__ . ' ERROR while dispatching '
                                                        . $this->func_name . "(" . var_export( $this->args, true ) . "): "
                                                        . "no data returned\n" );

                                        wfHttpError( 500, 'Internal Error',
                                                "{$this->func_name} returned no data" );
                                } else {
                                        if ( is_string( $result ) ) {
                                                $result = new AjaxResponse( $result );
                                        }

                                        $result->sendHeaders();
                                        $result->printText();

                                        wfDebug( __METHOD__ . ' dispatch complete for ' . $this->func_name . "\n" );
                                }
                        } catch ( Exception $e ) {
                                wfDebug( __METHOD__ . ' ERROR while dispatching '
                                                . $this->func_name . "(" . var_export( $this->args, true ) . "): "
                                                . get_class( $e ) . ": " . $e->getMessage() . "\n" );

                                if ( !headers_sent() ) {
                                        wfHttpError( 500, 'Internal Error',
                                                $e->getMessage() );
                                } else {
                                        print $e->getMessage();
                                }
                        }
                }

                $wgOut = null;
                wfProfileOut( __METHOD__ );
        }
}