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sw.js
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const map = new Map();
self.addEventListener('install', event => {
console.log("sw installed");
event.waitUntil(self.skipWaiting());
});
self.addEventListener('activate', event => {
console.log("sw activated");
event.waitUntil(self.clients.claim());
});
self.addEventListener('message', event => {
if (event.data === 'ping') {
return;
}
// console.log('message at sw');
const uniqueLink = self.registration.scope + "/local-download/" + Math.random();
const port = event.ports[0];
const stream = new ReadableStream({
start (controller) {
port.onmessage = ({ data }) => {
//console.log("got message ");
if (data === 'end') {
console.log('End of the download');
map.delete(uniqueLink);
port.close();
return controller.close();
}
if (data === 'abort') {
console.log('Aborted the download');
controller.error('Aborted the download');
map.delete(uniqueLink);
port.close();
return;
}
const realData = new Uint8Array(data.data);
controller.enqueue(realData);
};
port.onmessageerror = () => {
console.log("received onmessageerror in sw");
};
},
pull(controller) {
// On Firefox this is called multiple times.
// Fetch doesn't seem to support backpressure
port.postMessage({enqueued: true});
},
cancel () {
console.log('user aborted');
}
});
map.set(uniqueLink, [stream, event.data]);
port.postMessage({downloadLink: uniqueLink});
});
self.addEventListener('fetch', event => {
console.log('fetch ' + event);
const url = event.request.url;
console.log('Handling ', url);
const stored = map.get(url);
if (!stored) return;
const [stream, data] = stored;
const filename = encodeURIComponent(data.filename);
const headers = {
'Content-Type': 'application/octet-stream; charset=utf-8',
'Content-Disposition': "attachment; filename=" + filename,
'Content-Length': data.size
};
event.respondWith(new Response(stream, { headers }));
});