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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/continuation.ex
defmodule Bandit.HTTP2.Frame.Continuation do
@moduledoc false
import Bandit.HTTP2.Frame.Flags
defstruct stream_id: nil,
end_headers: false,
fragment: nil
@typedoc "An HTTP/2 CONTINUATION frame"
@type t :: %__MODULE__{
stream_id: Bandit.HTTP2.Stream.stream_id(),
end_headers: boolean(),
fragment: iodata()
}
@end_headers_bit 2
@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) do
{:error, Bandit.HTTP2.Errors.protocol_error(),
"CONTINUATION frame with zero stream_id (RFC9113§6.10)"}
end
def deserialize(flags, stream_id, <<fragment::binary>>) do
{:ok,
%__MODULE__{
stream_id: stream_id,
end_headers: set?(flags, @end_headers_bit),
fragment: fragment
}}
end
defimpl Bandit.HTTP2.Frame.Serializable do
@end_headers_bit 2
def serialize(%Bandit.HTTP2.Frame.Continuation{} = frame, max_frame_size) do
fragment_length = IO.iodata_length(frame.fragment)
if fragment_length <= max_frame_size do
[{0x9, set([@end_headers_bit]), frame.stream_id, frame.fragment}]
else
<<this_frame::binary-size(max_frame_size), rest::binary>> =
IO.iodata_to_binary(frame.fragment)
[
{0x9, 0x00, frame.stream_id, this_frame}
| Bandit.HTTP2.Frame.Serializable.serialize(
%Bandit.HTTP2.Frame.Continuation{stream_id: frame.stream_id, fragment: rest},
max_frame_size
)
]
end
end
end
end