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/// !-----------------------------------------------------------------------------------------------------------
/// |
// | `digest-fetch` is a wrapper of `node-fetch` or `fetch` to provide http digest authentication boostraping.
// |
/// !-----------------------------------------------------------------------------------------------------------
const canRequire = typeof(require) == 'function'
if (typeof(fetch) !== 'function' && canRequire) var fetch = require('node-fetch')
const md5 = require('md5')
const base64 = require('base-64')
const supported_algorithms = ['MD5', 'MD5-sess']
const parse = (raw, field, trim=true) => {
const regex = new RegExp(`${field}=("[^"]*"|[^,]*)`, "i")
const match = regex.exec(raw)
if (match)
return trim ? match[1].replace(/[\s"]/g, '') : match[1]
return null
}
class DigestClient {
constructor(user, password, options={}) {
this.user = user
this.password = password
this.nonceRaw = 'abcdef0123456789'
this.logger = options.logger
this.precomputedHash = options.precomputedHash
let algorithm = options.algorithm || 'MD5'
if (!supported_algorithms.includes(algorithm)) {
if (this.logger) this.logger.warn(`Unsupported algorithm ${algorithm}, will try with MD5`)
algorithm = 'MD5'
}
this.digest = { nc: 0, algorithm, realm: '' }
this.hasAuth = false
const _cnonceSize = parseInt(options.cnonceSize)
this.cnonceSize = isNaN(_cnonceSize) ? 32 : _cnonceSize // cnonce length 32 as default
// Custom authentication failure code for avoiding browser prompt:
// https://stackoverflow.com/questions/9859627/how-to-prevent-browser-to-invoke-basic-auth-popup-and-handle-401-error-using-jqu
this.statusCode = options.statusCode
this.basic = options.basic || false
}
async fetch (url, options={}) {
if (this.basic) return fetch(url, this.addBasicAuth(options))
const resp = await fetch(url, this.addAuth(url, options))
if (resp.status == 401 || (resp.status == this.statusCode && this.statusCode)) {
this.hasAuth = false
await this.parseAuth(resp.headers.get('www-authenticate'))
if (this.hasAuth) {
const respFinal = await fetch(url, this.addAuth(url, options))
if (respFinal.status == 401 || respFinal.status == this.statusCode) {
this.hasAuth = false
} else {
this.digest.nc++
}
return respFinal
}
} else this.digest.nc++
return resp
}
addBasicAuth (options={}) {
let _options = {}
if (typeof(options.factory) == 'function') {
_options = options.factory()
} else {
_options = options
}
const auth = 'Basic ' + base64.encode(this.user + ":" + this.password)
_options.headers = _options.headers || {}
_options.headers.Authorization = auth;
if (typeof(_options.headers.set) == 'function') {
_options.headers.set('Authorization', auth)
}
if (this.logger) this.logger.debug(options)
return _options
}
static computeHash(user, realm, password) {
return md5(`${user}:${realm}:${password}`);
}
addAuth (url, options) {
if (typeof(options.factory) == 'function') options = options.factory()
if (!this.hasAuth) return options
if (this.logger) this.logger.info(`requesting with auth carried`)
const isRequest = typeof(url) === 'object' && typeof(url.url) === 'string'
const urlStr = isRequest ? url.url : url
const _url = urlStr.replace('//', '')
const uri = _url.indexOf('/') == -1 ? '/' : _url.slice(_url.indexOf('/'))
const method = options.method ? options.method.toUpperCase() : 'GET'
let ha1 = this.precomputedHash ? this.password : DigestClient.computeHash(this.user, this.digest.realm, this.password)
if (this.digest.algorithm === 'MD5-sess') {
ha1 = md5(`${ha1}:${this.digest.nonce}:${this.digest.cnonce}`);
}
// optional MD5(entityBody) for 'auth-int'
let _ha2 = ''
if (this.digest.qop === 'auth-int') {
// not implemented for auth-int
if (this.logger) this.logger.warn('Sorry, auth-int is not implemented in this plugin')
// const entityBody = xxx
// _ha2 = ':' + md5(entityBody)
}
const ha2 = md5(`${method}:${uri}${_ha2}`);
const ncString = ('00000000'+this.digest.nc).slice(-8)
let _response = `${ha1}:${this.digest.nonce}:${ncString}:${this.digest.cnonce}:${this.digest.qop}:${ha2}`
if (!this.digest.qop) _response = `${ha1}:${this.digest.nonce}:${ha2}`
const response = md5(_response);
const opaqueString = this.digest.opaque !== null ? `opaque="${this.digest.opaque}",` : ''
const qopString = this.digest.qop ? `qop="${this.digest.qop}",` : ''
const digest = `${this.digest.scheme} username="${this.user}",realm="${this.digest.realm}",\
nonce="${this.digest.nonce}",uri="${uri}",${opaqueString}${qopString}\
algorithm="${this.digest.algorithm}",response="${response}",nc=${ncString},cnonce="${this.digest.cnonce}"`
options.headers = options.headers || {}
options.headers.Authorization = digest
if (typeof(options.headers.set) == 'function') {
options.headers.set('Authorization', digest)
}
if (this.logger) this.logger.debug(options)
// const {factory, ..._options} = options
const _options = {}
Object.assign(_options, options)
delete _options.factory
return _options;
}
async parseAuth (h) {
this.lastAuth = h
if (!h || h.length < 5) {
this.hasAuth = false
return
}
this.hasAuth = true
this.digest.scheme = h.split(/\s/)[0]
this.digest.realm = (parse(h, 'realm', false) || '').replace(/["]/g, '')
this.digest.qop = this.parseQop(h)
this.digest.opaque = parse(h, 'opaque')
this.digest.nonce = parse(h, 'nonce') || ''
this.digest.cnonce = this.makeNonce()
this.digest.nc++
}
parseQop (rawAuth) {
// Following https://en.wikipedia.org/wiki/Digest_access_authentication
// to parse valid qop
// Samples
// : qop="auth,auth-init",realm=
// : qop=auth,realm=
const _qop = parse(rawAuth, 'qop')
if (_qop !== null) {
const qops = _qop.split(',')
if (qops.includes('auth')) return 'auth'
else if (qops.includes('auth-int')) return 'auth-int'
}
// when not specified
return null
}
makeNonce () {
let uid = ''
for (let i = 0; i < this.cnonceSize; ++i) {
uid += this.nonceRaw[Math.floor(Math.random() * this.nonceRaw.length)];
}
return uid
}
static parse(...args) {
return parse(...args)
}
}
if (typeof(window) === "object") window.DigestFetch = DigestClient
module.exports = DigestClient
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