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- 'use strict'
- var randomBytes = require('random-bytes')
- var EQUAL_END_REGEXP = /=+$/
- var PLUS_GLOBAL_REGEXP = /\+/g
- var SLASH_GLOBAL_REGEXP = /\//g
- module.exports = uid
- module.exports.sync = uidSync
- function uid (length, callback) {
-
- if (callback !== undefined && typeof callback !== 'function') {
- throw new TypeError('argument callback must be a function')
- }
-
- if (!callback && !global.Promise) {
- throw new TypeError('argument callback is required')
- }
- if (callback) {
-
- return generateUid(length, callback)
- }
- return new Promise(function executor (resolve, reject) {
- generateUid(length, function onUid (err, str) {
- if (err) return reject(err)
- resolve(str)
- })
- })
- }
- function uidSync (length) {
- return toString(randomBytes.sync(length))
- }
- function generateUid (length, callback) {
- randomBytes(length, function (err, buf) {
- if (err) return callback(err)
- callback(null, toString(buf))
- })
- }
- function toString (buf) {
- return buf.toString('base64')
- .replace(EQUAL_END_REGEXP, '')
- .replace(PLUS_GLOBAL_REGEXP, '-')
- .replace(SLASH_GLOBAL_REGEXP, '_')
- }
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