Font.php

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<?php
class FCFontFinder {
    public static function findFile( $code ) {
        $data = self::callFontConfig( $code );
        if ( is_array( $data ) ) {
            return $data['file'];
        }

        return false;
    }

    public static function findFamily( $code ) {
        $data = self::callFontConfig( $code );
        if ( is_array( $data ) ) {
            return $data['family'];
        }

        return false;
    }

    protected static function callFontConfig( $code ) {
        if ( ini_get( 'open_basedir' ) ) {
            wfDebugLog( 'fcfont', 'Disabled because of open_basedir is active' );

            // Most likely we can't access any fonts we might find
            return false;
        }

        $cache = self::getCache();
        $cachekey = wfMemckey( 'fcfont', $code );
        $timeout = 60 * 60 * 12;

        $cached = $cache->get( $cachekey );
        if ( is_array( $cached ) ) {
            return $cached;
        } elseif ( $cached === 'NEGATIVE' ) {
            return false;
        }

        $code = wfEscapeShellArg( ":lang=$code" );
        $ok = 0;
        $cmd = "fc-match $code";
        $suggestion = wfShellExec( $cmd, $ok );

        wfDebugLog( 'fcfont', "$cmd returned $ok" );

        if ( $ok !== 0 ) {
            wfDebugLog( 'fcfont', "fc-match error output: $suggestion" );
            $cache->set( $cachekey, 'NEGATIVE', $timeout );

            return false;
        }

        $pattern = '/^(.*?): "(.*)" "(.*)"$/';
        $matches = array();

        if ( !preg_match( $pattern, $suggestion, $matches ) ) {
            wfDebugLog( 'fcfont', "fc-match: return format not understood: $suggestion" );
            $cache->set( $cachekey, 'NEGATIVE', $timeout );

            return false;
        }

        list( , $file, $family, $type ) = $matches;
        wfDebugLog( 'fcfont', "fc-match: got $file: $family $type" );

        $file = wfEscapeShellArg( $file );
        $family = wfEscapeShellArg( $family );
        $type = wfEscapeShellArg( $type );
        $cmd = "fc-list $family $type $code file | grep $file";

        $candidates = trim( wfShellExec( $cmd, $ok ) );

        wfDebugLog( 'fcfont', "$cmd returned $ok" );

        if ( $ok !== 0 ) {
            wfDebugLog( 'fcfont', "fc-list error output: $candidates" );
            $cache->set( $cachekey, 'NEGATIVE', $timeout );

            return false;
        }

        # trim spaces
        $files = array_map( 'trim', explode( "\n", $candidates ) );
        $count = count( $files );
        if ( !$count ) {
            wfDebugLog( 'fcfont', "fc-list got zero canditates: $candidates" );
        }

        # remove the trailing ":"
        $chosen = substr( $files[0], 0, -1 );

        wfDebugLog( 'fcfont', "fc-list got $count candidates; using $chosen" );

        $data = array(
            'family' => $family,
            'type' => $type,
            'file' => $chosen,
        );

        $cache->set( $cachekey, $data, $timeout );

        return $data;
    }

    protected static function getCache() {
        return wfGetCache( CACHE_ANYTHING );
    }
}