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<!DOCTYPE html>
<script>
const service_worker_unregister = async scope => {
const absoluteScope = new URL(scope, window.location).href;
const registration = await navigator.serviceWorker.getRegistration(scope);
if (registration && registration.scope === absoluteScope) {
return registration.unregister();
}
};
const service_worker_reregister = async (url, scope) => {
if (!scope || scope.length == 0) {
return Promise.reject(new Error('tests must define a scope'));
}
await service_worker_unregister(scope);
return navigator.serviceWorker.register(url, {'scope': scope});
};
const wait_for_state_activated = worker => {
if (worker.state === 'activated')
return Promise.resolve();
if (worker.state === 'redundant') {
return Promise.reject(new Error('worker is redundant'));
}
return new Promise(function(resolve) {
worker.addEventListener('statechange', () => {
if (worker.state === 'activated') {
resolve();
}
});
});
};
(async () => {
const script = '/resource-timing/resources/sw.js';
const scope = '/resource-timing/resources/';
const registration = await service_worker_reregister(script, scope);
await wait_for_state_activated(registration.installing);
const opener = window.opener;
if (!opener) {
return;
}
opener.postMessage("installed", "*");
window.addEventListener("message", async e => {
if (e.data === "unregister") {
await registration.unregister();
opener.postMessage("unregistered", "*");
}
});
})();
</script>
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