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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/priority.ex
defmodule Bandit.HTTP2.Frame.Priority do
@moduledoc false
alias Bandit.HTTP2.{Connection, Errors, Frame, Stream}
defstruct stream_id: nil, dependent_stream_id: nil, weight: nil
@typedoc "An HTTP/2 PRIORITY frame"
@type t :: %__MODULE__{
stream_id: Stream.stream_id(),
dependent_stream_id: Stream.stream_id(),
weight: non_neg_integer()
}
@spec deserialize(Frame.flags(), Stream.stream_id(), iodata()) ::
{:ok, t()} | {:error, Connection.error()}
def deserialize(_flags, 0, _payload) do
{:error,
{:connection, Errors.protocol_error(), "PRIORITY frame with zero stream_id (RFC7540§6.3)"}}
end
def deserialize(_flags, stream_id, <<_reserved::1, dependent_stream_id::31, weight::8>>) do
{:ok,
%__MODULE__{stream_id: stream_id, dependent_stream_id: dependent_stream_id, weight: weight}}
end
def deserialize(_flags, _stream_id, _payload) do
{:error,
{:connection, Errors.frame_size_error(),
"Invalid payload size in PRIORITY frame (RFC7540§6.3)"}}
end
defimpl Frame.Serializable do
alias Bandit.HTTP2.Frame.Priority
def serialize(%Priority{} = frame, _max_frame_size) do
[{0x2, 0x0, frame.stream_id, <<0::1, frame.dependent_stream_id::31, frame.weight::8>>}]
end
end
end