Sha256: bcac4717feecf106d171a305931cd4c1ec0c842bd1f1e1b6b3aad873ef3f1283
Contents?: true
Size: 1.79 KB
Versions: 17
Compression:
Stored size: 1.79 KB
Contents
/*!
* uid-safe
* Copyright(c) 2014 Jonathan Ong
* MIT Licensed
*/
/**
* Module dependencies.
* @private
*/
var Promise
var crypto = require('crypto')
var escape = require('base64-url').escape
/**
* Module exports.
*/
module.exports = uid
module.exports.sync = uidSync
/**
* Create a unique ID.
*
* @param {number} length
* @param {function} [callback]
* @return {Promise}
* @public
*/
function uid(length, callback) {
if (callback) {
return generateUid(length, callback)
}
if (!Promise) {
Promise = require('native-or-bluebird')
}
return new Promise(function (resolve, reject) {
generateUid(length, function (err, str) {
if (err) return reject(err)
resolve(str)
})
})
}
/**
* Create a unique ID sync.
*
* @param {number} length
* @return {string}
* @public
*/
function uidSync(length) {
try {
return toString(crypto.randomBytes(length))
} catch (e) {
return toString(crypto.pseudoRandomBytes(length))
}
}
/**
* Generate a unique ID string.
*
* @param {number} length
* @param {function} callback
* @private
*/
function generateUid(length, callback) {
randomBytes(length, function (err, buf) {
if (err) return callback(err)
callback(null, toString(buf))
})
}
/**
* Get some random bytes.
*
* @param {number} length
* @param {function} callback
* @return {Buffer}
* @private
*/
function randomBytes(length, callback) {
crypto.randomBytes(length, function (err, buf) {
if (!err) return callback(null, buf)
crypto.pseudoRandomBytes(length, function (err, buf) {
if (err) return callback(err)
callback(null, buf)
})
})
}
/**
* Change a Buffer into a string.
*
* @param {Buffer} buf
* @return {string}
* @private
*/
function toString(buf) {
return escape(buf.toString('base64'))
}
Version data entries
17 entries across 17 versions & 2 rubygems