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announce_validator.ex
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# Pleroma: A lightweight social networking server
# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Web.ActivityPub.ObjectValidators.AnnounceValidator do
use Ecto.Schema
alias Pleroma.EctoType.ActivityPub.ObjectValidators
alias Pleroma.Object
alias Pleroma.User
alias Pleroma.Web.ActivityPub.ObjectValidators.CommonFixes
alias Pleroma.Web.ActivityPub.Utils
alias Pleroma.Web.ActivityPub.Visibility
import Ecto.Changeset
import Pleroma.Web.ActivityPub.ObjectValidators.CommonValidations
require Pleroma.Constants
@primary_key false
embedded_schema do
quote do
unquote do
import Elixir.Pleroma.Web.ActivityPub.ObjectValidators.CommonFields
message_fields()
activity_fields()
end
end
field(:context, :string)
field(:published, ObjectValidators.DateTime)
end
def cast_and_validate(data) do
data
|> cast_data()
|> validate_data()
end
def cast_data(data) do
data =
data
|> fix()
%__MODULE__{}
|> changeset(data)
end
def changeset(struct, data) do
struct
|> cast(data, __schema__(:fields))
end
defp fix(data) do
data =
data
|> CommonFixes.fix_actor()
|> CommonFixes.fix_activity_addressing()
with %Object{} = object <- Object.normalize(data["object"]) do
data
|> CommonFixes.fix_activity_context(object)
|> CommonFixes.fix_object_action_recipients(object)
else
_ -> data
end
end
defp validate_data(data_cng) do
data_cng
|> validate_inclusion(:type, ["Announce"])
|> validate_required([:id, :type, :object, :actor, :to, :cc])
|> validate_actor_presence()
|> validate_object_presence()
|> validate_existing_announce()
|> validate_announcable()
end
defp validate_announcable(cng) do
with actor when is_binary(actor) <- get_field(cng, :actor),
object when is_binary(object) <- get_field(cng, :object),
%User{} = actor <- User.get_cached_by_ap_id(actor),
%Object{} = object <- Object.get_cached_by_ap_id(object),
false <- Visibility.public?(object) do
same_actor = object.data["actor"] == actor.ap_id
recipients = get_field(cng, :to) ++ get_field(cng, :cc)
local_public = Utils.as_local_public()
is_public =
Enum.member?(recipients, Pleroma.Constants.as_public()) or
Enum.member?(recipients, local_public)
cond do
same_actor && is_public ->
cng
|> add_error(:actor, "can not announce this object publicly")
!same_actor ->
cng
|> add_error(:actor, "can not announce this object")
true ->
cng
end
else
_ -> cng
end
end
defp validate_existing_announce(cng) do
actor = get_field(cng, :actor)
object = get_field(cng, :object)
if actor && object && Utils.get_existing_announce(actor, %{data: %{"id" => object}}) do
cng
|> add_error(:actor, "already announced this object")
|> add_error(:object, "already announced by this actor")
else
cng
end
end
end

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