49 lines
924 B
JavaScript
49 lines
924 B
JavaScript
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/**
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* Module depenndencies.
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*/
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var crypto = require('crypto');
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/**
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* 62 characters in the ascii range that can be used in URLs without special
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* encoding.
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*/
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var chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
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/**
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* Return a token of `length` characters.
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*
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* @param {Number} length
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* @param {Function} fn
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*/
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module.exports = function(length, fn){
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if (typeof length === 'function') fn = length, length = null;
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if (!length) length = 10;
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if (!fn) return str(crypto.randomBytes(length));
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crypto.randomBytes(length, function(err, bytes){
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if (err) return fn(err);
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fn(null, str(bytes));
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})
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}
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/**
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* Make a Buffer into a string ready for use in URLs.
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*
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* @param {Buffer}
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* @returns {String}
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* @api private
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*/
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function str(bytes){
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var res = [];
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for (var i = 0; i < bytes.length; i++){
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res.push(chars[bytes[i] % chars.length]);
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}
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return res.join('');
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}
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