auth.coffee

   1 fs = require 'fs'
   2 http = require 'http'
   3 crypto = require 'crypto'
   4 expat = require 'node-expat'
   5
   6 auth = {}
   7
   8 md5 = (str) ->
   9         sum = crypto.createHash 'md5'
  10         sum.update str
  11         return sum.digest 'hex'
  12
  13 new_auth_token = (user, pass) ->
  14         token = md5(user + md5(pass))
  15         auth.user = user
  16         auth.token = token
  17         return token
  18
  19 auth_file = "#{process.env.HOME}/.libre.fm-cmus.auth"
  20 save_auth = (user, pass, callback) ->
  21         token = new_auth_token(user, pass)
  22         text = JSON.stringify user: user, token: new_auth_token(user, pass)
  23         fs.writeFile auth_file, text, 'utf8', callback
  24         return token
  25
  26 # load login credentials from settings file
  27 load_auth = (callback) ->
  28         if auth.user and auth.token
  29                 callback auth
  30                 return
  31
  32         fs.readFile auth_file, 'utf8', (err, data) ->
  33                 if err
  34                         callback err
  35                 else
  36                         callback null, JSON.parse data
  37
  38 # login and get a session key
  39 login = (callback) ->
  40         load_auth (err, auth) ->
  41                 return callback(err) if err?
  42
  43                 http.get { host: 'alpha.libre.fm', port: 80, path: "/2.0/?method=auth.getmobilesession&username=#{auth.user}&authToken=#{auth.token}"}, (res) ->
  44                         if res.statusCode != 200
  45                                 console.log "login response code: #{res.statusCode}"
  46                                 callback "login response code: #{res.statusCode}"
  47                                 return
  48
  49                         res.setEncoding 'utf8'
  50                         body = ''
  51                         res.on 'data', (chunk) ->
  52                                 body += chunk
  53                         res.on 'end', ->
  54                                 parser = new expat.Parser 'UTF-8'
  55                                 cur_tag = ''
  56                                 done = false
  57                                 parser.on 'startElement', (name, attrs) ->
  58                                         cur_tag = name
  59                                 parser.on 'text', (str) ->
  60                                         if cur_tag is 'key'
  61                                                 done = true
  62                                                 auth.sk = str
  63                                                 console.log("got key \"#{str}\"")
  64                                                 callback null, str
  65                                         else if cur_tag is 'error'
  66                                                 done = true
  67                                                 callback "login failed: #{str}"
  68                                         # ignore other stuff in there
  69                                 unless parser.parse body, true
  70                                         done = true
  71                                         callback "login server response wouldn't parse as XML."
  72                                         console.log "login server sent us bad XML: #{body}"
  73
  74                                 unless done
  75                                         callback "Couldn't understand response from login server"
  76
  77
  78
  79 exports.login = login # fixme remove this from the API and call it automatically
  80 exports.new_auth_token = new_auth_token
  81 exports.save_auth = save_auth