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81 lines
2.2 KiB
Elixir
81 lines
2.2 KiB
Elixir
# Pleroma: A lightweight social networking server
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# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
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# SPDX-License-Identifier: AGPL-3.0-only
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defmodule Pleroma.Signature do
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@behaviour HTTPSignatures.Adapter
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alias Pleroma.EctoType.ActivityPub.ObjectValidators
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alias Pleroma.Keys
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alias Pleroma.User
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alias Pleroma.Web.ActivityPub.ActivityPub
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@known_suffixes ["/publickey", "/main-key"]
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def key_id_to_actor_id(key_id) do
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uri =
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key_id
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|> URI.parse()
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|> Map.put(:fragment, nil)
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|> remove_suffix(@known_suffixes)
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maybe_ap_id = URI.to_string(uri)
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case ObjectValidators.ObjectID.cast(maybe_ap_id) do
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{:ok, ap_id} ->
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{:ok, ap_id}
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_ ->
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case Pleroma.Web.WebFinger.finger(maybe_ap_id) do
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%{"ap_id" => ap_id} -> {:ok, ap_id}
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_ -> {:error, maybe_ap_id}
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end
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end
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end
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defp remove_suffix(uri, [test | rest]) do
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if not is_nil(uri.path) and String.ends_with?(uri.path, test) do
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Map.put(uri, :path, String.replace(uri.path, test, ""))
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else
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remove_suffix(uri, rest)
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end
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end
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defp remove_suffix(uri, []), do: uri
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def fetch_public_key(conn) do
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with %{"keyId" => kid} <- HTTPSignatures.signature_for_conn(conn),
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{:ok, actor_id} <- key_id_to_actor_id(kid),
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{:ok, public_key} <- User.get_public_key_for_ap_id(actor_id) do
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{:ok, public_key}
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else
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e ->
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{:error, e}
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end
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end
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def refetch_public_key(conn) do
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with %{"keyId" => kid} <- HTTPSignatures.signature_for_conn(conn),
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{:ok, actor_id} <- key_id_to_actor_id(kid),
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{:ok, _user} <- ActivityPub.make_user_from_ap_id(actor_id),
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{:ok, public_key} <- User.get_public_key_for_ap_id(actor_id) do
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{:ok, public_key}
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else
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e ->
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{:error, e}
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end
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end
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def sign(%User{} = user, headers) do
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with {:ok, %{keys: keys}} <- User.ensure_keys_present(user),
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{:ok, private_key, _} <- Keys.keys_from_pem(keys) do
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HTTPSignatures.sign(private_key, user.ap_id <> "#main-key", headers)
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end
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end
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def signed_date, do: signed_date(NaiveDateTime.utc_now())
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def signed_date(%NaiveDateTime{} = date) do
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Timex.format!(date, "{WDshort}, {0D} {Mshort} {YYYY} {h24}:{m}:{s} GMT")
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end
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end
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