Background page for authentication flow in the chrome extension

background.coffee

'use strict'
do ->
  BM = window.BM
  storage = chrome.storage.local
  authBaseUrl = BM.serverURL + '/oauth/authorize'

  onTokenSet = (token) ->
    console.debug 'token set to', token
    return

  onLoginFailed = (err) ->
    console.error 'login failed:', err and err.message, err
    return

  authParams = ->
    {
      client_id: BM.clientId
      response_type: 'token'
      redirect_uri: chrome.identity.getRedirectURL('provider_cb')
    }

  getAuthUrl = ->
    url = authBaseUrl
    params = authParams()
    Object.keys(params).forEach (key, index) ->
      url += (if index == 0 then '?' else '&') + key + '=' + params[key]
      return
    url

  login = (cb) ->
    chrome.identity.launchWebAuthFlow {
      url: getAuthUrl()
      interactive: true
    }, (resp) ->
      err = chrome.runtime.lastError
      token = resp and resp.match(/\#(?:access_token)\=([\S\s]*?)\&/)[1]
      if token
        storage.set { token: token }, ->
          cb and cb(null, token)
          onTokenSet token
          return
      else
        cb and cb(err)
        onLoginFailed err
      return
    return

  window.login = login
  return