MimeMagic.php

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<?php
use MediaWiki\MediaWikiServices;
use MediaWiki\Logger\LoggerFactory;

class MimeMagic extends MimeAnalyzer {
    public static function singleton() {
        return MediaWikiServices::getInstance()->getMIMEAnalyzer();
    }

    public static function applyDefaultParameters( array $params, Config $mainConfig ) {
        $logger = LoggerFactory::getInstance( 'Mime' );
        $params += [
            'typeFile' => $mainConfig->get( 'MimeTypeFile' ),
            'infoFile' => $mainConfig->get( 'MimeInfoFile' ),
            'xmlTypes' => $mainConfig->get( 'XMLMimeTypes' ),
            'guessCallback' =>
                function ( $mimeAnalyzer, &$head, &$tail, $file, &$mime ) use ( $logger ) {
                    // Also test DjVu
                    $deja = new DjVuImage( $file );
                    if ( $deja->isValid() ) {
                        $logger->info( __METHOD__ . ": detected $file as image/vnd.djvu\n" );
                        $mime = 'image/vnd.djvu';

                        return;
                    }
                    // Some strings by reference for performance - assuming well-behaved hooks
                    Hooks::run(
                        'MimeMagicGuessFromContent',
                        [ $mimeAnalyzer, &$head, &$tail, $file, &$mime ]
                    );
                },
            'extCallback' => function ( $mimeAnalyzer, $ext, &$mime ) {
                // Media handling extensions can improve the MIME detected
                Hooks::run( 'MimeMagicImproveFromExtension', [ $mimeAnalyzer, $ext, &$mime ] );
            },
            'initCallback' => function ( $mimeAnalyzer ) {
                // Allow media handling extensions adding MIME-types and MIME-info
                Hooks::run( 'MimeMagicInit', [ $mimeAnalyzer ] );
            },
            'logger' => $logger
        ];

        if ( $params['infoFile'] === 'includes/mime.info' ) {
            $params['infoFile'] = __DIR__ . "/libs/mime/mime.info";
        }

        if ( $params['typeFile'] === 'includes/mime.types' ) {
            $params['typeFile'] = __DIR__ . "/libs/mime/mime.types";
        }

        $detectorCmd = $mainConfig->get( 'MimeDetectorCommand' );
        if ( $detectorCmd ) {
            $params['detectCallback'] = function ( $file ) use ( $detectorCmd ) {
                return wfShellExec( "$detectorCmd " . wfEscapeShellArg( $file ) );
            };
        }

        return $params;
    }
}