fox-send/frontend/src/utils.js

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function arrayToHex(iv) {
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let hexStr = '';
// eslint-disable-next-line prefer-const
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for (let i in iv) {
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if (iv[i] < 16) {
hexStr += '0' + iv[i].toString(16);
} else {
hexStr += iv[i].toString(16);
}
}
return hexStr;
}
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function hexToArray(str) {
const iv = new Uint8Array(str.length / 2);
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for (let i = 0; i < str.length; i += 2) {
iv[i / 2] = parseInt(str.charAt(i) + str.charAt(i + 1), 16);
}
return iv;
}
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function notify(str) {
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return str;
/* TODO: enable once we have an opt-in ui element
if (!('Notification' in window)) {
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return;
} else if (Notification.permission === 'granted') {
new Notification(str);
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} else if (Notification.permission !== 'denied') {
Notification.requestPermission(function(permission) {
if (permission === 'granted') new Notification(str);
});
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}
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*/
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}
function gcmCompliant() {
try {
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return window.crypto.subtle
.generateKey(
{
name: 'AES-GCM',
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length: 128
},
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true,
['encrypt', 'decrypt']
)
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.then(key => {
return window.crypto.subtle
.encrypt(
{
name: 'AES-GCM',
iv: window.crypto.getRandomValues(new Uint8Array(12)),
additionalData: window.crypto.getRandomValues(new Uint8Array(6)),
tagLength: 128
},
key,
new ArrayBuffer(8)
)
.then(() => {
return Promise.resolve();
});
})
.catch(err => {
return loadShim();
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});
} catch (err) {
return loadShim();
}
function loadShim() {
return new Promise((resolve, reject) => {
const shim = document.createElement('script');
shim.src = '/cryptofill.js';
shim.addEventListener('load', resolve);
shim.addEventListener('error', reject);
document.head.appendChild(shim);
});
}
}
function isFile(id) {
return /^[0-9a-fA-F]{10}$/.test(id);
}
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function copyToClipboard(str) {
const aux = document.createElement('input');
aux.setAttribute('value', str);
aux.contentEditable = true;
aux.readOnly = true;
document.body.appendChild(aux);
if (navigator.userAgent.match(/iphone|ipad|ipod/i)) {
const range = document.createRange();
range.selectNodeContents(aux);
const sel = window.getSelection();
sel.removeAllRanges();
sel.addRange(range);
aux.setSelectionRange(0, str.length);
} else {
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aux.select();
}
const result = document.execCommand('copy');
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document.body.removeChild(aux);
return result;
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}
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const LOCALIZE_NUMBERS = !!(
typeof Intl === 'object' &&
Intl &&
typeof Intl.NumberFormat === 'function'
);
const UNITS = ['B', 'kB', 'MB', 'GB'];
function bytes(num) {
const exponent = Math.min(Math.floor(Math.log10(num) / 3), UNITS.length - 1);
const n = Number(num / Math.pow(1000, exponent));
const nStr = LOCALIZE_NUMBERS
? n.toLocaleString(navigator.languages, {
minimumFractionDigits: 1,
maximumFractionDigits: 1
})
: n.toFixed(1);
return `${nStr}${UNITS[exponent]}`;
}
function percent(ratio) {
return LOCALIZE_NUMBERS
? ratio.toLocaleString(navigator.languages, { style: 'percent' })
: `${Math.floor(ratio * 100)}%`;
}
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function allowedCopy() {
const support = !!document.queryCommandSupported;
return support ? document.queryCommandSupported('copy') : false;
}
const ONE_DAY_IN_MS = 86400000;
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export {
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allowedCopy,
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bytes,
percent,
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copyToClipboard,
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arrayToHex,
hexToArray,
notify,
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gcmCompliant,
isFile,
ONE_DAY_IN_MS
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};