ApiFormatPhp.php

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<?php
class ApiFormatPhp extends ApiFormatBase {

    public function getMimeType() {
        return 'application/vnd.php.serialized';
    }

    public function execute() {
        $params = $this->extractRequestParams();

        switch ( $params['formatversion'] ) {
            case 1:
                $transforms = [
                    'BC' => [],
                    'Types' => [],
                    'Strip' => 'all',
                ];
                break;

            case 2:
            case 'latest':
                $transforms = [
                    'Types' => [],
                    'Strip' => 'all',
                ];
                break;

            default:
                // Should have been caught during parameter validation
                $this->dieDebug( __METHOD__, 'Unknown value for \'formatversion\'' );
        }
        $text = serialize( $this->getResult()->getResultData( null, $transforms ) );

        // T68776: OutputHandler::mangleFlashPolicy() avoids a nasty bug in
        // Flash, but what it does isn't friendly for the API. There's nothing
        // we can do here that isn't actively broken in some manner, so let's
        // just be broken in a useful manner.
        if ( $this->getConfig()->get( 'MangleFlashPolicy' ) &&
            in_array( 'MediaWiki\\OutputHandler::handle', ob_list_handlers(), true ) &&
            preg_match( '/<\s*cross-domain-policy(?=\s|>)/i', $text )
        ) {
            $this->dieWithError( 'apierror-formatphp', 'internalerror' );
        }

        $this->printText( $text );
    }

    public function getAllowedParams() {
        $ret = parent::getAllowedParams() + [
            'formatversion' => [
                ApiBase::PARAM_TYPE => [ '1', '2', 'latest' ],
                ApiBase::PARAM_DFLT => '1',
                ApiBase::PARAM_HELP_MSG => 'apihelp-php-param-formatversion',
            ],
        ];
        return $ret;
    }
}