79 lines
3.4 KiB
JavaScript
79 lines
3.4 KiB
JavaScript
// NOTE: This file creates a service worker that cross-origin-isolates the page (read more here: https://web.dev/coop-coep/) which allows us to use wasm threads.
|
|
// Normally you would set the COOP and COEP headers on the server to do this, but Github Pages doesn't allow this, so this is a hack to do that.
|
|
|
|
/* Edited version of: coi-serviceworker v0.1.6 - Guido Zuidhof, licensed under MIT */
|
|
// From here: https://github.com/gzuidhof/coi-serviceworker
|
|
if(typeof window === 'undefined') {
|
|
self.addEventListener("install", () => self.skipWaiting());
|
|
self.addEventListener("activate", e => e.waitUntil(self.clients.claim()));
|
|
|
|
async function handleFetch(request) {
|
|
if(request.cache === "only-if-cached" && request.mode !== "same-origin") {
|
|
return;
|
|
}
|
|
|
|
if(request.mode === "no-cors") { // We need to set `credentials` to "omit" for no-cors requests, per this comment: https://bugs.chromium.org/p/chromium/issues/detail?id=1309901#c7
|
|
request = new Request(request.url, {
|
|
cache: request.cache,
|
|
credentials: "omit",
|
|
headers: request.headers,
|
|
integrity: request.integrity,
|
|
destination: request.destination,
|
|
keepalive: request.keepalive,
|
|
method: request.method,
|
|
mode: request.mode,
|
|
redirect: request.redirect,
|
|
referrer: request.referrer,
|
|
referrerPolicy: request.referrerPolicy,
|
|
signal: request.signal,
|
|
});
|
|
}
|
|
|
|
let r = await fetch(request).catch(e => console.error(e));
|
|
|
|
if(r.status === 0) {
|
|
return r;
|
|
}
|
|
|
|
const headers = new Headers(r.headers);
|
|
headers.set("Cross-Origin-Embedder-Policy", "require-corp"); // or: require-corp
|
|
headers.set("Cross-Origin-Opener-Policy", "same-origin");
|
|
|
|
return new Response(r.body, { status: r.status, statusText: r.statusText, headers });
|
|
}
|
|
|
|
self.addEventListener("fetch", function(e) {
|
|
e.respondWith(handleFetch(e.request)); // respondWith must be executed synchonously (but can be passed a Promise)
|
|
});
|
|
|
|
} else {
|
|
(async function() {
|
|
if(window.crossOriginIsolated !== false) return;
|
|
|
|
if (!('serviceWorker' in navigator)) {
|
|
alert("Your browser doesn't support service workers.\nIf you're using Firefox, you need to not be in a private window.")
|
|
}
|
|
|
|
let registration = await navigator.serviceWorker.register(window.document.currentScript.src).catch(e => console.error("COOP/COEP Service Worker failed to register:", e));
|
|
if(registration) {
|
|
console.log("COOP/COEP Service Worker registered", registration.scope);
|
|
|
|
registration.addEventListener("updatefound", () => {
|
|
console.log("Reloading page to make use of updated COOP/COEP Service Worker.");
|
|
window.location.reload();
|
|
});
|
|
|
|
// If the registration is active, but it's not controlling the page
|
|
if(registration.active && !navigator.serviceWorker.controller) {
|
|
console.log("Reloading page to make use of COOP/COEP Service Worker.");
|
|
window.location.reload();
|
|
}
|
|
}
|
|
})();
|
|
}
|
|
|
|
// Code to deregister:
|
|
// let registrations = await navigator.serviceWorker.getRegistrations();
|
|
// for(let registration of registrations) {
|
|
// await registration.unregister();
|
|
// }
|