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/*!
* basic-auth
* Copyright(c) 2013 TJ Holowaychuk
* Copyright(c) 2014 Jonathan Ong
* Copyright(c) 2015-2016 Douglas Christopher Wilson
* MIT Licensed
*/
'use strict'
/**
* Module dependencies.
* @private
*/
var Buffer = require('safe-buffer').Buffer
/**
* Module exports.
* @public
*/
module.exports = auth
module.exports.parse = parse
/**
* RegExp for basic auth credentials
*
* credentials = auth-scheme 1*SP token68
* auth-scheme = "Basic" ; case insensitive
* token68 = 1*( ALPHA / DIGIT / "-" / "." / "_" / "~" / "+" / "/" ) *"="
* @private
*/
var CREDENTIALS_REGEXP = /^ *(?:[Bb][Aa][Ss][Ii][Cc]) +([A-Za-z0-9._~+/-]+=*) *$/
/**
* RegExp for basic auth user/pass
*
* user-pass = userid ":" password
* userid = *<TEXT excluding ":">
* password = *TEXT
* @private
*/
var USER_PASS_REGEXP = /^([^:]*):(.*)$/
/**
* Parse the Authorization header field of a request.
*
* @param {object} req
* @return {object} with .name and .pass
* @public
*/
function auth (req) {
if (!req) {
throw new TypeError('argument req is required')
}
if (typeof req !== 'object') {
throw new TypeError('argument req is required to be an object')
}
// get header
var header = getAuthorization(req)
// parse header
return parse(header)
}
/**
* Decode base64 string.
* @private
*/
function decodeBase64 (str) {
return Buffer.from(str, 'base64').toString()
}
/**
* Get the Authorization header from request object.
* @private
*/
function getAuthorization (req) {
if (!req.headers || typeof req.headers !== 'object') {
throw new TypeError('argument req is required to have headers property')
}
return req.headers.authorization
}
/**
* Parse basic auth to object.
*
* @param {string} string
* @return {object}
* @public
*/
function parse (string) {
if (typeof string !== 'string') {
return undefined
}
// parse header
var match = CREDENTIALS_REGEXP.exec(string)
if (!match) {
return undefined
}
// decode user pass
var userPass = USER_PASS_REGEXP.exec(decodeBase64(match[1]))
if (!userPass) {
return undefined
}
// return credentials object
return new Credentials(userPass[1], userPass[2])
}
/**
* Object to represent user credentials.
* @private
*/
function Credentials (name, pass) {
this.name = name
this.pass = pass
}