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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.ObjectValidator do
@moduledoc """
This module is responsible for validating an object (which can be an activity)
and checking if it is both well formed and also compatible with our view of
the system.
"""
@behaviour Pleroma.Web.ActivityPub.ObjectValidator.Validating
alias Pleroma.Activity
alias Pleroma.EctoType.ActivityPub.ObjectValidators
alias Pleroma.Object
alias Pleroma.Object.Containment
alias Pleroma.User
alias Pleroma.Web.ActivityPub.ObjectValidators.AcceptRejectValidator
alias Pleroma.Web.ActivityPub.ObjectValidators.AddRemoveValidator
alias Pleroma.Web.ActivityPub.ObjectValidators.AnnounceValidator
alias Pleroma.Web.ActivityPub.ObjectValidators.AnswerValidator
alias Pleroma.Web.ActivityPub.ObjectValidators.ArticleNotePageValidator
alias Pleroma.Web.ActivityPub.ObjectValidators.AudioImageVideoValidator
alias Pleroma.Web.ActivityPub.ObjectValidators.BlockValidator
alias Pleroma.Web.ActivityPub.ObjectValidators.ChatMessageValidator
alias Pleroma.Web.ActivityPub.ObjectValidators.CreateChatMessageValidator
alias Pleroma.Web.ActivityPub.ObjectValidators.CreateGenericValidator
alias Pleroma.Web.ActivityPub.ObjectValidators.DeleteValidator
alias Pleroma.Web.ActivityPub.ObjectValidators.EmojiReactValidator
alias Pleroma.Web.ActivityPub.ObjectValidators.EventValidator
alias Pleroma.Web.ActivityPub.ObjectValidators.FollowValidator
alias Pleroma.Web.ActivityPub.ObjectValidators.LikeValidator
alias Pleroma.Web.ActivityPub.ObjectValidators.QuestionValidator
alias Pleroma.Web.ActivityPub.ObjectValidators.UndoValidator
alias Pleroma.Web.ActivityPub.ObjectValidators.UpdateValidator
@impl true
def validate(object, meta)
def validate(%{"type" => "Block"} = block_activity, meta) do
with {:ok, block_activity} <-
block_activity
|> BlockValidator.cast_and_validate()
|> Ecto.Changeset.apply_action(:insert) do
block_activity = stringify_keys(block_activity)
outgoing_blocks = Pleroma.Config.get([:activitypub, :outgoing_blocks])
meta =
if !outgoing_blocks do
Keyword.put(meta, :do_not_federate, true)
else
meta
end
{:ok, block_activity, meta}
end
end
def validate(%{"type" => "Undo"} = object, meta) do
with {:ok, object} <-
object
|> UndoValidator.cast_and_validate()
|> Ecto.Changeset.apply_action(:insert) do
object = stringify_keys(object)
undone_object = Activity.get_by_ap_id(object["object"])
meta =
meta
|> Keyword.put(:object_data, undone_object.data)
{:ok, object, meta}
end
end
def validate(%{"type" => "Delete"} = object, meta) do
with cng <- DeleteValidator.cast_and_validate(object),
do_not_federate <- DeleteValidator.do_not_federate?(cng),
{:ok, object} <- Ecto.Changeset.apply_action(cng, :insert) do
object = stringify_keys(object)
meta = Keyword.put(meta, :do_not_federate, do_not_federate)
{:ok, object, meta}
end
end
def validate(
%{"type" => "Create", "object" => %{"type" => "ChatMessage"} = object} = create_activity,
meta
) do
with {:ok, object_data} <- cast_and_apply(object),
meta = Keyword.put(meta, :object_data, object_data |> stringify_keys),
{:ok, create_activity} <-
create_activity
|> CreateChatMessageValidator.cast_and_validate(meta)
|> Ecto.Changeset.apply_action(:insert) do
create_activity = stringify_keys(create_activity)
{:ok, create_activity, meta}
end
end
def validate(
%{"type" => "Create", "object" => %{"type" => objtype} = object} = create_activity,
meta
)
when objtype in ~w[Question Answer Audio Video Image Event Article Note Page] do
with {:ok, object_data} <- cast_and_apply(object),
meta = Keyword.put(meta, :object_data, object_data |> stringify_keys),
{:ok, create_activity} <-
create_activity
|> CreateGenericValidator.cast_and_validate(meta)
|> Ecto.Changeset.apply_action(:insert) do
create_activity = stringify_keys(create_activity)
{:ok, create_activity, meta}
end
end
def validate(%{"type" => type} = object, meta)
when type in ~w[Event Question Audio Video Image Article Note Page] do
validator =
case type do
"Event" -> EventValidator
"Question" -> QuestionValidator
"Audio" -> AudioImageVideoValidator
"Video" -> AudioImageVideoValidator
"Image" -> AudioImageVideoValidator
"Article" -> ArticleNotePageValidator
"Note" -> ArticleNotePageValidator
"Page" -> ArticleNotePageValidator
end
with {:ok, object} <-
object
|> validator.cast_and_validate()
|> Ecto.Changeset.apply_action(:insert) do
object = stringify_keys(object)
# Insert copy of hashtags as strings for the non-hashtag table indexing
tag = (object["tag"] || []) ++ Object.hashtags(%Object{data: object})
object = Map.put(object, "tag", tag)
{:ok, object, meta}
end
end
def validate(%{"type" => type} = object, meta)
when type in ~w[Accept Reject Follow Update Like EmojiReact Announce
ChatMessage Answer] do
validator =
case type do
"Accept" -> AcceptRejectValidator
"Reject" -> AcceptRejectValidator
"Follow" -> FollowValidator
"Update" -> UpdateValidator
"Like" -> LikeValidator
"EmojiReact" -> EmojiReactValidator
"Announce" -> AnnounceValidator
"ChatMessage" -> ChatMessageValidator
"Answer" -> AnswerValidator
end
with {:ok, object} <-
object
|> validator.cast_and_validate()
|> Ecto.Changeset.apply_action(:insert) do
object = stringify_keys(object)
{:ok, object, meta}
end
end
def validate(%{"type" => type} = object, meta) when type in ~w(Add Remove) do
with {:ok, object} <-
object
|> AddRemoveValidator.cast_and_validate()
|> Ecto.Changeset.apply_action(:insert) do
object = stringify_keys(object)
{:ok, object, meta}
end
end
def validate(o, m), do: {:error, {:validator_not_set, {o, m}}}
def cast_and_apply(%{"type" => "ChatMessage"} = object) do
ChatMessageValidator.cast_and_apply(object)
end
def cast_and_apply(%{"type" => "Question"} = object) do
QuestionValidator.cast_and_apply(object)
end
def cast_and_apply(%{"type" => "Answer"} = object) do
AnswerValidator.cast_and_apply(object)
end
def cast_and_apply(%{"type" => type} = object) when type in ~w[Audio Image Video] do
AudioImageVideoValidator.cast_and_apply(object)
end
def cast_and_apply(%{"type" => "Event"} = object) do
EventValidator.cast_and_apply(object)
end
def cast_and_apply(%{"type" => type} = object) when type in ~w[Article Note Page] do
ArticleNotePageValidator.cast_and_apply(object)
end
def cast_and_apply(o), do: {:error, {:validator_not_set, o}}
# is_struct/1 appears in Elixir 1.11
def stringify_keys(%{__struct__: _} = object) do
object
|> Map.from_struct()
|> stringify_keys
end
def stringify_keys(object) when is_map(object) do
object
|> Enum.filter(fn {_, v} -> v != nil end)
|> Map.new(fn {key, val} -> {to_string(key), stringify_keys(val)} end)
end
def stringify_keys(object) when is_list(object) do
object
|> Enum.map(&stringify_keys/1)
end
def stringify_keys(object), do: object
def fetch_actor(object) do
with actor <- Containment.get_actor(object),
{:ok, actor} <- ObjectValidators.ObjectID.cast(actor) do
User.get_or_fetch_by_ap_id(actor)
end
end
def fetch_actor_and_object(object) do
fetch_actor(object)
Object.normalize(object["object"], fetch: true)
:ok
end
end
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