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# Pleroma: A lightweight social networking server
# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Web.Plugs.DigestPlug do
alias Plug.Conn
require Logger
def read_body(conn, opts) do
digest_algorithm =
with [digest_header] <- Conn.get_req_header(conn, "digest") do
digest_header
|> String.split("=", parts: 2)
|> List.first()
else
_ -> "SHA-256"
end
unless String.downcase(digest_algorithm) == "sha-256" do
raise ArgumentError,
message: "invalid value for digest algorithm, got: #{digest_algorithm}"
end
{:ok, body, conn} = Conn.read_body(conn, opts)
encoded_digest = :crypto.hash(:sha256, body) |> Base.encode64()
{:ok, body, Conn.assign(conn, :digest, "#{digest_algorithm}=#{encoded_digest}")}
end
end
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