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96 lines
2.8 KiB
JavaScript
96 lines
2.8 KiB
JavaScript
var unidecode = require('unidecode'),
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utils,
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getRandomInt;
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/**
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* Return a random int, used by `utils.uid()`
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*
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* @param {Number} min
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* @param {Number} max
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* @return {Number}
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* @api private
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*/
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getRandomInt = function (min, max) {
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return Math.floor(Math.random() * (max - min + 1)) + min;
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};
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utils = {
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/**
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* Timespans in seconds and milliseconds for better readability
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*/
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ONE_HOUR_S: 3600,
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ONE_DAY_S: 86400,
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ONE_YEAR_S: 31536000,
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ONE_HOUR_MS: 3600000,
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ONE_DAY_MS: 86400000,
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ONE_WEEK_MS: 604800000,
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ONE_MONTH_MS: 2628000000,
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ONE_YEAR_MS: 31536000000,
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/**
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* Return a unique identifier with the given `len`.
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*
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* utils.uid(10);
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* // => "FDaS435D2z"
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*
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* @param {Number} len
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* @return {String}
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* @api private
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*/
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uid: function (len) {
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var buf = [],
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chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789',
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charlen = chars.length,
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i;
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for (i = 1; i < len; i = i + 1) {
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buf.push(chars[getRandomInt(0, charlen - 1)]);
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}
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return buf.join('');
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},
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safeString: function (string) {
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// Handle the £ symbol seperately, since it needs to be removed before
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// the unicode conversion.
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string = string.replace(/£/g, '-');
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// Remove non ascii characters
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string = unidecode(string);
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// Replace URL reserved chars: `:/?#[]!$&()*+,;=` as well as `\%<>|^~£"`
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string = string.replace(/(\s|\.|@|:|\/|\?|#|\[|\]|!|\$|&|\(|\)|\*|\+|,|;|=|\\|%|<|>|\||\^|~|"|–|—)/g, '-')
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// Remove apostrophes
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.replace(/'/g, '')
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// Convert 2 or more dashes into a single dash
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.replace(/-+/g, '-')
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// Remove any dashes at the beginning
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.replace(/^-/, '')
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// Make the whole thing lowercase
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.toLowerCase();
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// Remove trailing dash if needed
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string = string.charAt(string.length - 1) === '-' ? string.substr(0, string.length - 1) : string;
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// Handle whitespace at the beginning or end.
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string = string.trim();
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return string;
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},
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// The token is encoded URL safe by replacing '+' with '-', '\' with '_' and removing '='
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// NOTE: the token is not encoded using valid base64 anymore
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encodeBase64URLsafe: function (base64String) {
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return base64String.replace(/\+/g, '-').replace(/\//g, '_').replace(/=+$/, '');
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},
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// Decode url safe base64 encoding and add padding ('=')
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decodeBase64URLsafe: function (base64String) {
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base64String = base64String.replace(/-/g, '+').replace(/_/g, '/');
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while (base64String.length % 4) {
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base64String += '=';
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}
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return base64String;
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}
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};
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module.exports = utils;
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