mirror of
https://gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/snowflake.git
synced 2025-10-14 05:11:19 -04:00
61 lines
1.9 KiB
CoffeeScript
61 lines
1.9 KiB
CoffeeScript
###
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Only websocket-specific stuff.
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###
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class WS
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@WSS_ENABLED: true
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@DEFAULT_PORTS:
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http: 80
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https: 443
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# Build an escaped URL string from unescaped components. Only scheme and host
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# are required. See RFC 3986, section 3.
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@buildUrl: (scheme, host, port, path, params) ->
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parts = []
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parts.push(encodeURIComponent scheme)
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parts.push '://'
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# If it contains a colon but no square brackets, treat it as IPv6.
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if host.match(/:/) && !host.match(/[[\]]/)
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parts.push '['
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parts.push host
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parts.push ']'
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else
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parts.push(encodeURIComponent host)
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if undefined != port && @DEFAULT_PORTS[scheme] != port
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parts.push ':'
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parts.push(encodeURIComponent port.toString())
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if undefined != path && '' != path
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if !path.match(/^\//)
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path = '/' + path
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###
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Slash is significant so we must protect it from encodeURIComponent, while
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still encoding question mark and number sign. RFC 3986, section 3.3: 'The
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path is terminated by the first question mark ('?') or number sign ('#')
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character, or by the end of the URI. ... A path consists of a sequence of
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path segments separated by a slash ('/') character.'
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###
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path = path.replace /[^\/]+/, (m) ->
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encodeURIComponent m
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parts.push path
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if undefined != params
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parts.push '?'
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parts.push Query.buildString params
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parts.join ''
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@makeWebsocket: (addr, params) ->
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wsProtocol = if @WSS_ENABLED then 'wss' else 'ws'
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url = @buildUrl wsProtocol, addr.host, addr.port, '/', params
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ws = new WebSocket url
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###
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'User agents can use this as a hint for how to handle incoming binary data:
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if the attribute is set to 'blob', it is safe to spool it to disk, and if it
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is set to 'arraybuffer', it is likely more efficient to keep the data in
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memory.'
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###
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ws.binaryType = 'arraybuffer'
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ws
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