69 lines
2 KiB
Elixir
69 lines
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.User
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alias Pleroma.Web.ActivityPub.ActivityPub
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alias Pleroma.User.SigningKey
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def key_id_to_actor_id(key_id) do
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# Given the key ID, first attempt to look it up in the signing keys table.
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# If it's not found, then attempt to look it up via request to the remote instance.
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case SigningKey.key_id_to_ap_id(key_id) do
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nil ->
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# this requires us to look up the url!
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request_key_id_from_remote_instance(key_id)
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key ->
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{:ok, key}
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end
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end
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def request_key_id_from_remote_instance(key_id) do
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case SigningKey.fetch_remote_key(key_id) do
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{:ok, key_id} ->
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{:ok, key_id}
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{:error, _} ->
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{:error, "Key ID not found"}
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end
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end
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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, private_key} <- SigningKey.private_key(user) 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.lformat!(date, "{WDshort}, {0D} {Mshort} {YYYY} {h24}:{m}:{s} GMT", "en")
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end
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end
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