mirror of
https://gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/snowflake.git
synced 2025-10-13 20:11:19 -04:00
95 lines
2.4 KiB
CoffeeScript
95 lines
2.4 KiB
CoffeeScript
# General snowflake proxy constants.
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# For websocket-specific constants, see websocket.coffee.
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BROKER = 'snowflake-broker.bamsoftware.com'
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RELAY =
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host: 'snowflake.bamsoftware.com'
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port: '443'
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# Original non-wss relay:
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# host: '192.81.135.242'
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# port: 9902
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COOKIE_NAME = "snowflake-allow"
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silenceNotifications = false
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query = Query.parse(location)
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DEBUG = Params.getBool(query, 'debug', false)
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# Bytes per second. Set to undefined to disable limit.
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DEFAULT_RATE_LIMIT = DEFAULT_RATE_LIMIT || undefined
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MIN_RATE_LIMIT = 10 * 1024
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RATE_LIMIT_HISTORY = 5.0
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DEFAULT_BROKER_POLL_INTERVAL = 5.0 * 1000
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MAX_NUM_CLIENTS = 1
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CONNECTIONS_PER_CLIENT = 1
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# TODO: Different ICE servers.
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config = {
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iceServers: [
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{ urls: ['stun:stun.l.google.com:19302'] }
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]
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}
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# Janky state machine
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MODE =
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INIT: 0
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WEBRTC_CONNECTING: 1
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WEBRTC_READY: 2
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CONFIRMATION_MESSAGE = 'You\'re currently serving a Tor user via Snowflake.'
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snowflake = null
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# Log to both console and UI if applicable.
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# Requires that the snowflake and UI objects are hooked up in order to
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# log to console.
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log = (msg) ->
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console.log 'Snowflake: ' + msg
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snowflake?.ui?.log msg
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dbg = (msg) -> log msg if DEBUG or snowflake.ui?.debug
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snowflakeIsDisabled = ->
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cookies = Parse.cookie document.cookie
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# Do nothing if snowflake has not been opted in by user.
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if cookies[COOKIE_NAME] != '1'
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log 'Not opted-in. Please click the badge to change options.'
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return true
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# Also do nothing if running in Tor Browser.
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if mightBeTBB()
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log 'Will not run within Tor Browser.'
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return true
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return false
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###
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Entry point.
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###
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init = (isNode) ->
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# Hook up to the debug UI if available.
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ui = if isNode then null else new UI()
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silenceNotifications = Params.getBool(query, 'silent', false)
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broker = new Broker BROKER
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snowflake = new Snowflake broker, ui
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log '== snowflake proxy =='
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if snowflakeIsDisabled()
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# Do not activate the proxy if any number of conditions are true.
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log 'Currently not active.'
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return
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# Otherwise, begin setting up WebRTC and acting as a proxy.
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dbg 'Contacting Broker at ' + broker.url
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snowflake.setRelayAddr RELAY
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snowflake.beginWebRTC()
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# Notification of closing tab with active proxy.
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window.onbeforeunload = ->
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if !silenceNotifications && MODE.WEBRTC_READY == snowflake.state
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return CONFIRMATION_MESSAGE
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null
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window.onunload = ->
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pair.close() for pair in snowflake.proxyPairs
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null
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window.onload = init.bind null, false
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