ghost/core/server/utils/index.js

/**
 * Return a random int, used by `utils.uid()`
 *
 * @param {Number} min
 * @param {Number} max
 * @return {Number}
 * @api private
 */
function getRandomInt(min, max) {
    return Math.floor(Math.random() * (max - min + 1)) + min;
}

var utils = {
    /**
     * Return a unique identifier with the given `len`.
     *
     *     utils.uid(10);
     *     // => "FDaS435D2z"
     *
     * @param {Number} len
     * @return {String}
     * @api private
     */
    uid: function (len) {
        var buf = [],
            chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789',
            charlen = chars.length,
            i;

        for (i = 1; i < len; i = i + 1) {
            buf.push(chars[getRandomInt(0, charlen - 1)]);
        }

        return buf.join('');
    }
};

module.exports = utils;