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// This worker is designed to expose information about clients that is only available from Service Worker contexts.
//
// In the case of the `onfetch` handler, it provides the `clientId` property of
// the `event` object. In the case of the `onmessage` handler, it provides the
// Client instance attributes of the requested clients.
self.onfetch = function(e) {
if (/\/clientId$/.test(e.request.url)) {
e.respondWith(new Response(e.clientId));
return;
}
};
self.onmessage = function(e) {
var client_ids = e.data.clientIds;
var message = [];
e.waitUntil(Promise.all(
client_ids.map(function(client_id) {
return self.clients.get(client_id);
}))
.then(function(clients) {
// No matching client for a given id or a matched client is off-origin
// from the service worker.
if (clients.length == 1 && clients[0] == undefined) {
e.source.postMessage(clients[0]);
} else {
clients.forEach(function(client) {
if (client instanceof Client) {
message.push([client.visibilityState,
client.focused,
client.url,
client.type,
client.frameType]);
} else {
message.push(client);
}
});
e.source.postMessage(message);
}
}));
};
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