79 lines
2.9 KiB
JavaScript
79 lines
2.9 KiB
JavaScript
//---------------------------------------------------------------------------
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// @syndicate-lang/driver-browser-ui, Browser-based UI for Syndicate
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// Copyright (C) 2016-2018 Tony Garnock-Jones <tonyg@leastfixedpoint.com>
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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//---------------------------------------------------------------------------
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if (require('preserves/src/singletonmodule.js')('syndicate-lang.org/syndicate-js',
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require('../package.json').version,
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'randomid.js',
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module)) return;
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let randomId;
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function browserCryptoObject(crypto) {
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if (typeof crypto.getRandomValues === 'undefined') return false;
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randomId = function (byteCount, hexOutput) {
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let buf = new Uint8Array(byteCount);
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crypto.getRandomValues(buf);
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if (hexOutput) {
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let encoded = [];
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for (let i = 0; i < buf.length; i++) {
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encoded.push("0123456789abcdef"[(buf[i] >> 4) & 15]);
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encoded.push("0123456789abcdef"[buf[i] & 15]);
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}
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return encoded.join('');
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} else {
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return btoa(String.fromCharCode.apply(null, buf)).replace(/=/g,'');
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}
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};
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return true;
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}
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if ((typeof window !== 'undefined') &&
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(typeof window.crypto !== 'undefined') &&
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browserCryptoObject(window.crypto)) {
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// We are in the main page, and window.crypto is available, and
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// browserCryptoObject has installed a suitable randomId. Do
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// nothing.
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} else if ((typeof self !== 'undefined') &&
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(typeof self.crypto !== 'undefined') &&
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browserCryptoObject(self.crypto)) {
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// We are in a web worker, and self.crypto is available, and
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// browserCryptoObject has installed a suitable randomId. Do
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// nothing.
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} else {
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// See if we're in node.js.
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let crypto;
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try {
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crypto = require('crypto');
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} catch (e) {}
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if ((typeof crypto !== 'undefined') &&
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(typeof crypto.randomBytes !== 'undefined')) {
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randomId = function (byteCount, hexOutput) {
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if (hexOutput) {
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return crypto.randomBytes(byteCount).hexSlice().replace(/=/g,'');
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} else {
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return crypto.randomBytes(byteCount).base64Slice().replace(/=/g,'');
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}
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};
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} else {
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console.warn('No suitable implementation for RandomID.randomId available.');
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}
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}
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module.exports.randomId = randomId;
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