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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/http2/frame/ping.ex
defmodule Bandit.HTTP2.Frame.Ping do
@moduledoc false
import Bandit.HTTP2.Frame.Flags
defstruct ack: false, payload: nil
@typedoc "An HTTP/2 PING frame"
@type t :: %__MODULE__{
ack: boolean(),
payload: iodata()
}
@ack_bit 0
@spec deserialize(Bandit.HTTP2.Frame.flags(), Bandit.HTTP2.Stream.stream_id(), iodata()) ::
{:ok, t()} | {:error, Bandit.HTTP2.Errors.error_code(), binary()}
def deserialize(flags, 0, <<payload::binary-size(8)>>) when set?(flags, @ack_bit) do
{:ok, %__MODULE__{ack: true, payload: payload}}
end
def deserialize(flags, 0, <<payload::binary-size(8)>>) when clear?(flags, @ack_bit) do
{:ok, %__MODULE__{ack: false, payload: payload}}
end
def deserialize(_flags, stream_id, _payload) when stream_id != 0 do
{:error, Bandit.HTTP2.Errors.protocol_error(),
"Invalid stream ID in PING frame (RFC9113§6.7)"}
end
def deserialize(_flags, _stream_id, _payload) do
{:error, Bandit.HTTP2.Errors.frame_size_error(),
"PING frame with invalid payload size (RFC9113§6.7)"}
end
defimpl Bandit.HTTP2.Frame.Serializable do
@ack_bit 0
def serialize(%Bandit.HTTP2.Frame.Ping{ack: true} = frame, _max_frame_size),
do: [{0x6, set([@ack_bit]), 0, frame.payload}]
def serialize(%Bandit.HTTP2.Frame.Ping{ack: false} = frame, _max_frame_size),
do: [{0x6, 0x0, 0, frame.payload}]
end
end