Create coi-serviceworker.js

coi-serviceworker.js

@@ -0,0 +1,39 @@
+/*! coi-serviceworker v0.1.7 - By Guido Zuidhof, licensed under MIT */
+let coepCredentialless = false;
+if (typeof window === 'undefined') {
+  self.addEventListener("install", () => self.skipWaiting());
+  self.addEventListener("activate", (event) => event.waitUntil(self.clients.claim()));
+  self.addEventListener("message", (ev) => {
+    if (!ev.data) return;
+    if (ev.data.type === "deregister") {
+      self.registration.unregister().then(() => self.clients.matchAll().then(clients => clients.forEach(client => client.navigate(client.url))));
+    }
+  });
+  self.addEventListener("fetch", function (event) {
+    const { request } = event;
+    if (request.cache === "only-if-cached" && request.mode !== "same-origin") return;
+    event.respondWith(
+      fetch(request).then((response) => {
+        if (response.status === 0) return response;
+        const newHeaders = new Headers(response.headers);
+        newHeaders.set("Cross-Origin-Embedder-Policy", coepCredentialless ? "credentialless" : "require-corp");
+        if (!coepCredentialless) newHeaders.set("Cross-Origin-Resource-Policy", "cross-origin");
+        newHeaders.set("Cross-Origin-Opener-Policy", "same-origin");
+        return new Response(response.body, { status: response.status, statusText: response.statusText, headers: newHeaders });
+      }).catch((e) => console.error(e))
+    );
+  });
+} else {
+  (() => {
+    const re = window.location.reload.bind(window.location);
+    const n = navigator;
+    if (n.serviceWorker && n.serviceWorker.controller) {
+      n.serviceWorker.controller.postMessage({ type: "coep_credentialless", value: coepCredentialless });
+    } else {
+      n.serviceWorker && n.serviceWorker.register(window.document.currentScript.src).then((registration) => {
+        registration.addEventListener("updatefound", () => re());
+        if (registration.active && !n.serviceWorker.controller) re();
+      });
+    }
+  })();
+}