digest_plug.ex
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digest_plug.ex
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	# Pleroma: A lightweight social networking server
	# Copyright © 2017-2022 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