74 lines
1.9 KiB
JavaScript
74 lines
1.9 KiB
JavaScript
import Keychain from './keychain';
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self.addEventListener('install', event => {
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self.skipWaiting();
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});
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async function decryptStream(request) {
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self.controller = new AbortController();
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//console.log('SW INTERCEPTED DOWNLOAD');
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const response = await fetch(request.url, {
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method: 'GET',
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headers: { Authorization: self.auth },
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signal: controller.signal
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});
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if (response.status !== 200) {
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return response;
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}
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self.authHeader = response.headers.get('WWW-Authenticate');
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const body = response.body; //stream
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const progStream = new TransformStream({
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transform: (chunk, controller) => {
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self.progress += chunk.length;
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controller.enqueue(chunk);
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}
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});
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const decrypted = self.keychain.decryptStream(body.pipeThrough(progStream));
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const headers = {
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headers: {
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'Content-Disposition': 'attachment; filename=' + self.filename
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}
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};
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const newRes = new Response(decrypted, headers);
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return newRes;
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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.key) {
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self.keychain = new Keychain(event.data.key, event.data.nonce);
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self.filename = event.data.filename;
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self.auth = event.data.auth;
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self.progress = 0;
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self.cancelled = false;
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event.ports[0].postMessage('file info received');
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} else if (event.data === 'progress') {
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if (self.cancelled) {
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event.ports[0].postMessage({ error: 'cancelled' });
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} else {
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event.ports[0].postMessage(self.progress);
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}
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} else if (event.data === 'authHeader') {
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event.ports[0].postMessage(self.authHeader);
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} else if (event.data === 'cancel') {
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self.cancelled = true;
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if (self.controller) {
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self.controller.abort();
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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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