fox-send/app/serviceWorker.js

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import Keychain from './keychain';
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import { downloadStream } from './api';
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import { transformStream } from './streams';
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import Zip from './zip';
import contentDisposition from 'content-disposition';
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let noSave = false;
const map = new Map();
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self.addEventListener('install', event => {
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self.skipWaiting();
});
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self.addEventListener('activate', event => {
self.clients.claim();
});
async function decryptStream(id) {
const file = map.get(id);
if (!file) {
return new Response(null, { status: 400 });
}
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try {
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let size = file.size;
let type = file.type;
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const keychain = new Keychain(file.key, file.nonce);
if (file.requiresPassword) {
keychain.setPassword(file.password, file.url);
}
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file.download = downloadStream(id, keychain);
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const body = await file.download.result;
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const decrypted = keychain.decryptStream(body);
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let zipStream = null;
if (file.type === 'send-archive') {
const zip = new Zip(file.manifest, decrypted);
zipStream = zip.stream;
type = 'application/zip';
size = zip.size;
}
const responseStream = transformStream(
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zipStream || decrypted,
{
transform(chunk, controller) {
file.progress += chunk.length;
controller.enqueue(chunk);
}
},
function oncancel() {
// NOTE: cancel doesn't currently fire on chrome
// https://bugs.chromium.org/p/chromium/issues/detail?id=638494
file.download.cancel();
map.delete(id);
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}
);
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const headers = {
'Content-Disposition': contentDisposition(file.filename),
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'Content-Type': type,
'Content-Length': size
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};
return new Response(responseStream, { headers });
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} catch (e) {
if (noSave) {
return new Response(null, { status: e.message });
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}
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return new Response(null, {
status: 302,
headers: {
Location: `/download/${id}`
}
});
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}
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}
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self.onfetch = event => {
const req = event.request;
const match = /\/api\/download\/([A-Fa-f0-9]{4,})/.exec(req.url);
if (match) {
event.respondWith(decryptStream(match[1]));
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}
};
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self.onmessage = event => {
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if (event.data.request === 'init') {
noSave = event.data.noSave;
const info = {
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key: event.data.key,
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nonce: event.data.nonce,
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filename: event.data.filename,
requiresPassword: event.data.requiresPassword,
password: event.data.password,
url: event.data.url,
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type: event.data.type,
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manifest: event.data.manifest,
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size: event.data.size,
progress: 0
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};
map.set(event.data.id, info);
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event.ports[0].postMessage('file info received');
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} else if (event.data.request === 'progress') {
const file = map.get(event.data.id);
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if (!file) {
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event.ports[0].postMessage({ error: 'cancelled' });
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} else {
if (file.progress === file.size) {
map.delete(event.data.id);
}
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event.ports[0].postMessage({ progress: file.progress });
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}
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} else if (event.data.request === 'cancel') {
const file = map.get(event.data.id);
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if (file) {
if (file.download) {
file.download.cancel();
}
map.delete(event.data.id);
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}
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event.ports[0].postMessage('download cancelled');
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}
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};