File: SafeFontParser-Worker.html

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<!DOCTYPE html>
<html>
<head>
    <script>
    let fontLoadResult;

    let fontWorkerSource = new Blob([`
        self.onmessage = function(e) {
            const { fontFamily, fontUrl, options } = e.data;

            async function loadFont(fontFamily, fontUrl, options = {}) {
                try {
                    const fontFace = new FontFace(fontFamily, fontUrl, options);
                    const loadedFont = await fontFace.load();
                    fonts.add(loadedFont);
                    return { success: true, fontFamily };
                } catch (error) {
                    return { success: false, fontFamily, error: error.message };
                }
            }

            loadFont(fontFamily, fontUrl, options)
                .then(result => {
                    self.postMessage(result);
                }).catch(error => {
                    self.postMessage({
                        success: false,
                        fontFamily,
                        error: error.message
                    });
                });
        };`], {type: 'application/javascript'});

    let fontWorker = new Worker(URL.createObjectURL(fontWorkerSource));

    fontWorker.onmessage = function(e) {
        const { success, fontFamily, error } = e.data;
        if (success) {
            fontLoadResult = "success";
        } else {
            fontLoadResult = error;
        }

        console.log(fontLoadResult);
    };

    fontWorker.onerror = function(error) {
        fontLoadResult = error.message;
        console.log(fontLoadResult);
    };
    </script>
</head>
<body>
</body>
</html>