janl/couchdb-cookie-in-pure-js.js

## couchdb-cookie-in-pure-js.js
/*
  We are trying to mimick:
  make_cookie_hash(UserName, Secret, TimeStamp) ->
      SessionData = UserName ++ ":" ++ erlang:integer_to_list(TimeStamp, 16),
      Hash = crypto:sha_mac(Secret, SessionData),
      couch_util:encodeBase64Url(SessionData ++ ":" ++ ?b2l(Hash)).

  SessionData = string(Username) + ":" + string(TimeStamp)
  Hsah = sha_mac(string(Secret), string(SessionData))
  return base64_encode(string(SessionData) + ":" + string(Hash))

  might have to use https://github.com/iriscouch/erlang.js or https://github.com/okeuday/erlang_js

UserName: "jan"
Secret: <<"4ed13457964f05535fbb54c0e9f77a83d5513283df4f649c72757a91aa30bdde">>
TimeStamp: 1449689785
SessionData: "jan:566882B9"
Hash: <<65,10,223,237,82,70,199,168,235,35,81,29,249,62,154,105,58,204,236,102>>
R: <<"amFuOjU2Njg4MkI5OkEK3-1SRseo6yNRHfk-mmk6zOxm">>


  secret: 4ed13457964f05535fbb54c0e9f77a83
  salt: d5513283df4f649c72757a91aa30bdde

  hash: amFuOjU2Njg4MTc1OoX6TDq2hsQk550vVKTkzbhlgSJe

*/
var crypto = require('crypto')

var make_cookie_hash = function(UserName, Secret, TimeStamp) {
  var ts = TimeStamp.toString(16).toUpperCase()
  var SessionData = UserName + ':' + ts
  var hmac = crypto.createHmac('sha1', Secret)
  hmac.update(SessionData)
  var hash = hmac.digest()

  var result = Buffer.concat([
    new Buffer(SessionData + ':'),
    new Buffer(hash)
  ]).toString('base64')

  console.log('UserName: ', UserName)
  console.log('Secret: ', Secret)
  console.log('TimeStamp: ', TimeStamp)
  console.log('SessionData: ', SessionData)
  console.log('hash: ', hash)
  console.log('result: ', result)
  return result.replace(/\+/g, '-')
}

var timestamp = 1449689785
var username = 'jan'
var secret = '4ed13457964f05535fbb54c0e9f77a83d5513283df4f649c72757a91aa30bdde' // server secret + user salt

var result = make_cookie_hash(username, secret, timestamp)

console.log();
console.log('WANT: amFuOjU2Njg4MkI5OkEK3-1SRseo6yNRHfk-mmk6zOxm')
console.log('GOT: ', result)