70 lines
2 KiB
Elixir
70 lines
2 KiB
Elixir
# Portions of this file are derived from Pleroma:
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# Copyright © 2017-2018 Pleroma Authors <https://pleroma.social>
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# SPDX-License-Identifier: AGPL-3.0-only
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# Upstream: https://git.pleroma.social/pleroma/pleroma/blob/develop/lib/pleroma/plugs/http_signature.ex
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defmodule Mobilizon.Web.Plugs.HTTPSignatures do
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@moduledoc """
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Plug to check HTTP Signatures on every incoming request
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"""
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import Plug.Conn
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require Logger
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def init(options) do
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options
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end
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@spec call(Plug.Conn.t(), any) :: Plug.Conn.t()
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def call(%{assigns: %{valid_signature: true}} = conn, _opts) do
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conn
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end
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def call(conn, _opts) do
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case get_req_header(conn, "signature") do
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[signature | _] ->
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if signature do
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# set (request-target) header to the appropriate value
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# we also replace the digest header with the one we computed
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conn =
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conn
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|> put_req_header(
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"(request-target)",
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String.downcase("#{conn.method}") <> " #{conn.request_path}"
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)
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conn =
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if conn.assigns[:digest] do
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conn
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|> put_req_header("digest", conn.assigns[:digest])
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else
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conn
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end
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signature_valid = HTTPSignatures.validate_conn(conn)
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Logger.debug("Is signature valid ? #{inspect(signature_valid)}")
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date_valid = date_valid?(conn)
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assign(conn, :valid_signature, signature_valid && date_valid)
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else
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Logger.debug("No signature header!")
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conn
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end
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_ ->
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conn
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end
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end
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@spec date_valid?(Plug.Conn.t()) :: boolean()
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defp date_valid?(conn) do
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with [date | _] <- get_req_header(conn, "date") || [""],
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{:ok, date} <- Timex.parse(date, "{WDshort}, {0D} {Mshort} {YYYY} {h24}:{m}:{s} GMT") do
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Timex.diff(date, DateTime.utc_now(), :hours) <= 12 &&
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Timex.diff(date, DateTime.utc_now(), :hours) >= -12
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else
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_ -> false
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end
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end
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end
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