fox-send/app/capabilities.js

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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']
);
return true;
} catch (err) {
return false;
}
}
function checkStreams() {
try {
new ReadableStream({
pull() {}
});
return true;
} catch (e) {
return false;
}
}
function polyfillStreams() {
try {
require('@mattiasbuelens/web-streams-polyfill');
return true;
} catch (e) {
return false;
}
}
export default async function capabilities() {
const crypto = await checkCrypto();
const nativeStreams = checkStreams();
const polyStreams = nativeStreams ? false : polyfillStreams();
let account = false;
try {
account = !!localStorage;
} catch (e) {
// nevermind
}
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return {
account,
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crypto,
streamUpload: nativeStreams || polyStreams,
streamDownload:
nativeStreams &&
'serviceWorker' in navigator &&
browserName() !== 'safari',
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multifile: nativeStreams || polyStreams
};
}