99 lines
2.6 KiB
JavaScript
99 lines
2.6 KiB
JavaScript
import Keychain from './keychain';
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import { downloadStream } from './api';
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import { transform } from './streams';
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import contentDisposition from 'content-disposition';
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let noSave = false;
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const map = new Map();
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self.addEventListener('install', event => {
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self.skipWaiting();
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});
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self.addEventListener('activate', event => {
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self.clients.claim();
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});
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async function decryptStream(request) {
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const id = request.url.split('/')[5];
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try {
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const file = map.get(id);
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const keychain = new Keychain(file.key, file.nonce);
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file.download = downloadStream(id, keychain);
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const body = await file.download.result;
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const readStream = transform(body, {
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transform: (chunk, controller) => {
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file.progress += chunk.length;
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controller.enqueue(chunk);
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}
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});
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const decrypted = keychain.decryptStream(readStream);
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const headers = {
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'Content-Disposition': contentDisposition(file.filename),
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'Content-Type': file.type,
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'Content-Length': file.size
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};
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return new Response(decrypted, { headers });
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} catch (e) {
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if (noSave) {
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return new Response(null, { status: e.message });
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}
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const redirectRes = await fetch(`/download/${id}`);
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return new Response(redirectRes.body, { status: 302 });
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} finally {
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// TODO: need to clean up, but not break progress
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// map.delete(id)
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}
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}
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self.onfetch = event => {
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const req = event.request.clone();
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if (req.url.includes('/api/download')) {
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event.respondWith(decryptStream(req));
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}
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};
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self.onmessage = event => {
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if (event.data.request === 'init') {
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noSave = event.data.noSave;
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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,
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type: event.data.type,
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size: event.data.size,
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progress: 0,
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cancelled: false
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};
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if (event.data.requiresPassword) {
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info.password = event.data.password;
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info.url = event.data.url;
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}
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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') {
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const file = map.get(event.data.id);
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if (!file) {
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event.ports[0].postMessage({ progress: 0 });
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} else if (file.cancelled) {
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event.ports[0].postMessage({ error: 'cancelled' });
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} else {
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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') {
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const file = map.get(event.data.id);
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if (file) {
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file.cancelled = true;
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if (file.download) {
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file.download.cancel();
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}
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}
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event.ports[0].postMessage('download cancelled');
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}
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};
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