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   1 # Pleroma: A lightweight social networking server
   2 # Copyright © 2017-2020 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   def key_id_to_actor_id(key_id) do
  13     uri =
  14       URI.parse(key_id)
  15       |> Map.put(:fragment, nil)
  16
  17     uri =
  18       if not is_nil(uri.path) and String.ends_with?(uri.path, "/publickey") do
  19         Map.put(uri, :path, String.replace(uri.path, "/publickey", ""))
  20       else
  21         uri
  22       end
  23
  24     URI.to_string(uri)
  25   end
  26
  27   def fetch_public_key(conn) do
  28     with %{"keyId" => kid} <- HTTPSignatures.signature_for_conn(conn),
  29          actor_id <- key_id_to_actor_id(kid),
  30          {:ok, public_key} <- User.get_public_key_for_ap_id(actor_id) do
  31       {:ok, public_key}
  32     else
  33       e ->
  34         {:error, e}
  35     end
  36   end
  37
  38   def refetch_public_key(conn) do
  39     with %{"keyId" => kid} <- HTTPSignatures.signature_for_conn(conn),
  40          actor_id <- key_id_to_actor_id(kid),
  41          {:ok, _user} <- ActivityPub.make_user_from_ap_id(actor_id),
  42          {:ok, public_key} <- User.get_public_key_for_ap_id(actor_id) do
  43       {:ok, public_key}
  44     else
  45       e ->
  46         {:error, e}
  47     end
  48   end
  49
  50   def sign(%User{} = user, headers) do
  51     with {:ok, %{keys: keys}} <- User.ensure_keys_present(user),
  52          {:ok, private_key, _} <- Keys.keys_from_pem(keys) do
  53       HTTPSignatures.sign(private_key, user.ap_id <> "#main-key", headers)
  54     end
  55   end
  56
  57   def signed_date, do: signed_date(NaiveDateTime.utc_now())
  58
  59   def signed_date(%NaiveDateTime{} = date) do
  60     Timex.format!(date, "{WDshort}, {0D} {Mshort} {YYYY} {h24}:{m}:{s} GMT")
  61   end
  62 end