http_signature.ex (1747B)
- # Pleroma: A lightweight social networking server
- # Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
- # SPDX-License-Identifier: AGPL-3.0-only
- defmodule Pleroma.Web.Plugs.HTTPSignaturePlug do
- import Plug.Conn
- import Phoenix.Controller, only: [get_format: 1, text: 2]
- require Logger
- def init(options) do
- options
- end
- def call(%{assigns: %{valid_signature: true}} = conn, _opts) do
- conn
- end
- def call(conn, _opts) do
- if get_format(conn) == "activity+json" do
- conn
- |> maybe_assign_valid_signature()
- |> maybe_require_signature()
- else
- conn
- end
- end
- defp maybe_assign_valid_signature(conn) do
- if has_signature_header?(conn) do
- # set (request-target) header to the appropriate value
- # we also replace the digest header with the one we computed
- request_target = String.downcase("#{conn.method}") <> " #{conn.request_path}"
- conn =
- conn
- |> put_req_header("(request-target)", request_target)
- |> case do
- %{assigns: %{digest: digest}} = conn -> put_req_header(conn, "digest", digest)
- conn -> conn
- end
- assign(conn, :valid_signature, HTTPSignatures.validate_conn(conn))
- else
- Logger.debug("No signature header!")
- conn
- end
- end
- defp has_signature_header?(conn) do
- conn |> get_req_header("signature") |> Enum.at(0, false)
- end
- defp maybe_require_signature(%{assigns: %{valid_signature: true}} = conn), do: conn
- defp maybe_require_signature(conn) do
- if Pleroma.Config.get([:activitypub, :authorized_fetch_mode], false) do
- conn
- |> put_status(:unauthorized)
- |> text("Request not signed")
- |> halt()
- else
- conn
- end
- end
- end