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/*! * basic-auth * Copyright(c) 2013 TJ Holowaychuk * Copyright(c) 2014 Jonathan Ong * Copyright(c) 2015-2016 Douglas Christopher Wilson * Copyright(c) 2020 Anthony Mancini * MIT Licensed */
'use strict'
/** * Module dependencies. * @private */
import Buffer_lib from "./deps/safe-buffer/index.js";var Buffer = Buffer_lib.Buffer;

/** * 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 */
export 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.get("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}