89 lines
1.7 KiB
JavaScript
89 lines
1.7 KiB
JavaScript
/* global AUTH_CONFIG */
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import { browserName } from './utils';
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async function checkCrypto() {
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try {
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const key = await crypto.subtle.generateKey(
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{
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name: 'AES-GCM',
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length: 128
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},
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true,
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['encrypt', 'decrypt']
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);
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await crypto.subtle.exportKey('raw', key);
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await crypto.subtle.encrypt(
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{
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name: 'AES-GCM',
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iv: crypto.getRandomValues(new Uint8Array(12)),
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tagLength: 128
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},
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key,
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new ArrayBuffer(8)
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);
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await crypto.subtle.importKey(
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'raw',
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crypto.getRandomValues(new Uint8Array(16)),
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'PBKDF2',
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false,
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['deriveKey']
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);
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await crypto.subtle.importKey(
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'raw',
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crypto.getRandomValues(new Uint8Array(16)),
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'HKDF',
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false,
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['deriveKey']
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);
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return true;
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} catch (err) {
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return false;
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}
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}
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function checkStreams() {
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try {
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new ReadableStream({
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pull() {}
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});
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return true;
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} catch (e) {
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return false;
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}
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}
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async function polyfillStreams() {
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try {
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await import('@mattiasbuelens/web-streams-polyfill');
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return true;
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} catch (e) {
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return false;
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}
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}
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export default async function capabilities() {
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const crypto = await checkCrypto();
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const nativeStreams = checkStreams();
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let polyStreams = false;
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if (!nativeStreams) {
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polyStreams = await polyfillStreams();
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}
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let account = typeof AUTH_CONFIG !== 'undefined';
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try {
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account = account && !!localStorage;
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} catch (e) {
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// nevermind
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}
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return {
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account,
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crypto,
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streamUpload: nativeStreams || polyStreams,
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streamDownload:
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nativeStreams &&
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'serviceWorker' in navigator &&
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browserName() !== 'safari',
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multifile: nativeStreams || polyStreams
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};
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}
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