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   1 # Pleroma: A lightweight social networking server
   2 # Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
   3 # SPDX-License-Identifier: AGPL-3.0-only
   4
   5 defmodule Pleroma.Signature do
   6   @behaviour HTTPSignatures.Adapter
   7
   8   alias Pleroma.Keys
   9   alias Pleroma.User
  10   alias Pleroma.Web.ActivityPub.ActivityPub
  11
  12   defp key_id_to_actor_id(key_id) do
  13     URI.parse(key_id)
  14     |> Map.put(:fragment, nil)
  15     |> URI.to_string()
  16   end
  17
  18   def fetch_public_key(conn) do
  19     with %{"keyId" => kid} <- HTTPSignatures.signature_for_conn(conn),
  20          actor_id <- key_id_to_actor_id(kid),
  21          {:ok, public_key} <- User.get_public_key_for_ap_id(actor_id) do
  22       {:ok, public_key}
  23     else
  24       e ->
  25         {:error, e}
  26     end
  27   end
  28
  29   def refetch_public_key(conn) do
  30     with %{"keyId" => kid} <- HTTPSignatures.signature_for_conn(conn),
  31          actor_id <- key_id_to_actor_id(kid),
  32          {:ok, _user} <- ActivityPub.make_user_from_ap_id(actor_id),
  33          {:ok, public_key} <- User.get_public_key_for_ap_id(actor_id) do
  34       {:ok, public_key}
  35     else
  36       e ->
  37         {:error, e}
  38     end
  39   end
  40
  41   def sign(%User{} = user, headers) do
  42     with {:ok, %{info: %{keys: keys}}} <- User.ensure_keys_present(user),
  43          {:ok, private_key, _} <- Keys.keys_from_pem(keys) do
  44       HTTPSignatures.sign(private_key, user.ap_id <> "#main-key", headers)
  45     end
  46   end
  47 end