45 lines
1.2 KiB
JavaScript
45 lines
1.2 KiB
JavaScript
function synthesizeImage(suffix) {
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// Serve image-20px for the first page, and image-40px for the second page.
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return clients
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.matchAll()
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.then(clients => {
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var url = "image-20px.png";
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clients.forEach(client => {
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if (client.url.indexOf("?new") > 0) {
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url = "image-40px.png";
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}
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client.postMessage({ suffix, url });
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});
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return fetch(url);
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})
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.then(response => {
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return response.arrayBuffer();
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})
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.then(ab => {
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var headers;
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if (suffix == "") {
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headers = {
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"Content-Type": "image/png",
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Date: "Tue, 1 Jan 1990 01:02:03 GMT",
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"Cache-Control": "max-age=1",
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};
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} else {
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headers = {
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"Content-Type": "image/png",
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"Cache-Control": "no-cache",
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};
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}
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return new Response(ab, {
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status: 200,
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headers,
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});
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});
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}
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self.addEventListener("fetch", function (event) {
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if (event.request.url.includes("image.png")) {
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event.respondWith(synthesizeImage(""));
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} else if (event.request.url.includes("image2.png")) {
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event.respondWith(synthesizeImage("2"));
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}
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});
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