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