Last change
on this file since 8d391a1 was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago |
initial commit
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1 | 'use strict';
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2 |
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3 | var crypto = require('crypto');
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4 |
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5 | // This string has length 32, a power of 2, so the modulus doesn't introduce a
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6 | // bias.
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7 | var _randomStringChars = 'abcdefghijklmnopqrstuvwxyz012345';
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8 | module.exports = {
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9 | string: function(length) {
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10 | var max = _randomStringChars.length;
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11 | var bytes = crypto.randomBytes(length);
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12 | var ret = [];
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13 | for (var i = 0; i < length; i++) {
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14 | ret.push(_randomStringChars.substr(bytes[i] % max, 1));
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15 | }
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16 | return ret.join('');
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17 | }
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18 |
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19 | , number: function(max) {
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20 | return Math.floor(Math.random() * max);
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21 | }
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22 |
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23 | , numberString: function(max) {
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24 | var t = ('' + (max - 1)).length;
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25 | var p = new Array(t + 1).join('0');
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26 | return (p + this.number(max)).slice(-t);
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27 | }
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28 | };
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