snowflake/proxy/broker.coffee
2016-01-21 10:44:14 -08:00

48 lines
1.6 KiB
CoffeeScript

###
Communication with the snowflake broker.
Browser snowflakes must register with the broker in order
to get assigned to clients.
###
# Represents a broker running remotely.
class Broker
# When interacting with the Broker, snowflake must generate a unique session
# ID so the Broker can keep track of which signalling channel it's speaking
# to.
constructor: (@url) ->
log 'Using Broker at ' + @url
# Snowflake registers with the broker using an HTTP POST request, and expects
# a response from the broker containing some client offer
register: ->
# base_url = this.fac_url.replace(/\?.*/, "");
# url = base_url + "?" + build_query_string(params);
xhr = new XMLHttpRequest()
try
xhr.open 'POST', @url
catch err
###
An exception happens here when, for example, NoScript allows the domain on
which the proxy badge runs, but not the domain to which it's trying to
make the HTTP request. The exception message is like "Component returned
failure code: 0x805e0006 [nsIXMLHttpRequest.open]" on Firefox.
###
log 'Broker: exception while connecting: ' + err.message
return
# xhr.responseType = 'text'
xhr.onreadystatechange = ->
if xhr.DONE == xhr.readyState
log 'Broker: ' + xhr.status
if 200 == xhr.status
log 'Response: ' + xhr.responseText
log xhr
else
log 'Broker error ' + xhr.status + ' - ' + xhr.statusText
xhr.send 'snowflake-testing'
log "Broker: sent a registration message, waiting for reply..."
sendAnswer: (answer) ->
log 'Sending answer to broker.'
log answer