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A pure-Elixir HTTP server built for Plug & WebSock apps
Security advisory:
This version has known vulnerabilities.
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lib/bandit/primitive_ops/websocket.ex
defmodule Bandit.PrimitiveOps.WebSocket do
@moduledoc """
WebSocket primitive operations behaviour and default implementation
"""
@doc """
WebSocket masking according to [RFC6455§5.3](https://www.rfc-editor.org/rfc/rfc6455#section-5.3)
"""
@callback ws_mask(payload :: binary(), mask :: integer()) :: binary()
@behaviour __MODULE__
# Note that masking is an involution, so we don't need a separate unmask function
@impl true
def ws_mask(payload, mask)
when is_binary(payload) and is_integer(mask) and mask >= 0x00000000 and mask <= 0xFFFFFFFF do
ws_mask(<<>>, payload, mask)
end
defp ws_mask(acc, <<h::32, rest::binary>>, mask) do
ws_mask(<<acc::binary, (<<Bitwise.bxor(h, mask)::32>>)>>, rest, mask)
end
for size <- [24, 16, 8] do
defp ws_mask(acc, <<h::unquote(size)>>, mask) do
<<mask::unquote(size), _::binary>> = <<mask::32>>
<<acc::binary, (<<Bitwise.bxor(h, mask)::unquote(size)>>)>>
end
end
defp ws_mask(acc, <<>>, _mask) do
acc
end
end