fox-send/app/capabilities.js

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/* global AUTH_CONFIG */
import { browserName } from './utils';
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async function checkCrypto() {
try {
const key = await crypto.subtle.generateKey(
{
name: 'AES-GCM',
length: 128
},
true,
['encrypt', 'decrypt']
);
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await crypto.subtle.exportKey('raw', key);
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await crypto.subtle.encrypt(
{
name: 'AES-GCM',
iv: crypto.getRandomValues(new Uint8Array(12)),
tagLength: 128
},
key,
new ArrayBuffer(8)
);
await crypto.subtle.importKey(
'raw',
crypto.getRandomValues(new Uint8Array(16)),
'PBKDF2',
false,
['deriveKey']
);
await crypto.subtle.importKey(
'raw',
crypto.getRandomValues(new Uint8Array(16)),
'HKDF',
false,
['deriveKey']
);
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await crypto.subtle.generateKey(
{
name: 'ECDH',
namedCurve: 'P-256'
},
true,
['deriveBits']
);
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return true;
} catch (err) {
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try {
window.asmCrypto = await import('asmcrypto.js');
await import('@dannycoates/webcrypto-liner/build/shim');
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return true;
} catch (e) {
return false;
}
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}
}
function checkStreams() {
try {
new ReadableStream({
pull() {}
});
return true;
} catch (e) {
return false;
}
}
async function polyfillStreams() {
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try {
await import('@mattiasbuelens/web-streams-polyfill');
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return true;
} catch (e) {
return false;
}
}
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export default async function getCapabilities() {
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const serviceWorker =
'serviceWorker' in navigator && browserName() !== 'edge';
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let crypto = await checkCrypto();
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const nativeStreams = checkStreams();
let polyStreams = false;
if (!nativeStreams) {
polyStreams = await polyfillStreams();
}
let account = typeof AUTH_CONFIG !== 'undefined';
try {
account = account && !!localStorage && browserName() !== 'edge';
} catch (e) {
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account = false;
}
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return {
account,
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crypto,
serviceWorker,
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streamUpload: nativeStreams || polyStreams,
streamDownload:
nativeStreams && serviceWorker && browserName() !== 'safari',
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multifile: nativeStreams || polyStreams
};
}