84 lines
2.4 KiB
Elixir
84 lines
2.4 KiB
Elixir
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# Portions of this file are derived from Pleroma:
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# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social>
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# SPDX-License-Identifier: AGPL-3.0-only
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# Upstream: https://git.pleroma.social/pleroma/pleroma/blob/develop/lib/pleroma/signature.ex
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defmodule Mobilizon.Service.HTTPSignatures.Signature do
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@moduledoc """
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Adapter for the `HTTPSignatures` lib that handles signing and providing public keys to verify HTTPSignatures
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"""
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@behaviour HTTPSignatures.Adapter
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alias Mobilizon.Actors.Actor
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alias Mobilizon.Service.ActivityPub
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require Logger
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def key_id_to_actor_url(key_id) do
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uri =
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URI.parse(key_id)
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|> Map.put(:fragment, nil)
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uri =
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if not is_nil(uri.path) and String.ends_with?(uri.path, "/publickey") do
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Map.put(uri, :path, String.replace(uri.path, "/publickey", ""))
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else
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uri
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end
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URI.to_string(uri)
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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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actor_id <- key_id_to_actor_url(kid),
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:ok <- Logger.debug("Fetching public key for #{actor_id}"),
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{:ok, public_key} <- Actor.get_public_key_for_url(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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actor_id <- key_id_to_actor_url(kid),
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:ok <- Logger.debug("Refetching public key for #{actor_id}"),
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{:ok, _actor} <- ActivityPub.make_actor_from_url(actor_id),
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{:ok, public_key} <- Actor.get_public_key_for_url(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(%Actor{} = actor, headers) do
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Logger.debug("Signing on behalf of #{actor.url}")
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Logger.debug("headers")
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Logger.debug(inspect(headers))
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with {:ok, key} <- actor.keys |> Actor.prepare_public_key() do
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HTTPSignatures.sign(key, actor.url <> "#main-key", headers)
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end
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end
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def generate_date_header(date \\ Timex.now("GMT")) do
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case Timex.format(date, "%a, %d %b %Y %H:%M:%S %Z", :strftime) do
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{:ok, date} ->
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date
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{:error, err} ->
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Logger.error("Unable to generate date header")
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Logger.debug(inspect(err))
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nil
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end
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end
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def generate_request_target(method, path), do: "#{method} #{path}"
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def build_digest(body) do
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"SHA-256=" <> (:crypto.hash(:sha256, body) |> Base.encode64())
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end
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end
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