腾讯云边缘安全加速（EdgeOne）之图片优化

/**
 * 图片转换 for EdgeOne Worker
 * @url https://www.rehiy.com/post/505/
 * @author Rehiy
 */

async function handleEvent(request) {
    const uObj = new URL(request.url);
    const resize = uObj.search.match(/(\d+)x(\d+)/);
    const accept = request.headers.get('Accept');

    const option = {
        eo: {
            image: {},
            cacheKey: request.url,
        }
    };

    if (resize) {
        if (resize[1] > 0) {
            option.eo.image.width = +resize[1];
        }
        if (resize[2] > 0) {
            option.eo.image.height = +resize[2];
        }
    }

    for (const format of ['avif', 'webp', 'jp2', 'jxr', 'heif']) {
        if (accept.includes(format)) {
            option.eo.image.format = format;
            option.eo.cacheKey += '.' + format;
            break;
        }
    }

    const resp = await fetch(request, option);
    resp.headers.set('Backend-Option', JSON.stringify(option));
    resp.headers.set('Vary', 'Accept');

    return resp;
}

// eo listener

addEventListener('fetch', event => {
    event.passThroughOnException();
    event.respondWith(handleEvent(event.request));
});