mirror of
https://github.com/ether/etherpad-lite.git
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62 lines
2.1 KiB
JavaScript
62 lines
2.1 KiB
JavaScript
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// @license magnet:?xt=urn:btih:8e4f440f4c65981c5bf93c76d35135ba5064d8b7&dn=apache-2.0.txt Apache-2.0
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/**
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* Copyright 2011 Peter Martischka, Primary Technology.
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* Copyright 2020 Richard Hansen
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/* global $, customStart */
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function randomPadName() {
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// the number of distinct chars (64) is chosen to ensure that the selection will be uniform when
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// using the PRNG below
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const chars = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz-_';
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// the length of the pad name is chosen to get 120-bit security: log2(64^20) = 120
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const string_length = 20;
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// make room for 8-bit integer values that span from 0 to 255.
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const randomarray = new Uint8Array(string_length);
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// use browser's PRNG to generate a "unique" sequence
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const cryptoObj = window.crypto || window.msCrypto; // for IE 11
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cryptoObj.getRandomValues(randomarray);
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let randomstring = '';
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for (let i = 0; i < string_length; i++) {
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// instead of writing "Math.floor(randomarray[i]/256*64)"
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// we can save some cycles.
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const rnum = Math.floor(randomarray[i]/4);
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randomstring += chars.substring(rnum, rnum + 1);
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}
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return randomstring;
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}
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$(() => {
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$('#go2Name').submit(function() {
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const padname = $('#padname').val();
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if (padname.length > 0) {
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window.location = 'p/' + encodeURIComponent(padname.trim());
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} else {
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alert('Please enter a name');
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}
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return false;
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});
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$('#button').click(function() {
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window.location = 'p/' + randomPadName();
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});
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// start the custom js
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if (typeof customStart === 'function') customStart();
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});
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// @license-end
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