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# Pleroma: A lightweight social networking server
# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Web.ActivityPub.ObjectValidators.LikeValidator do
use Ecto.Schema
alias Pleroma.EctoType.ActivityPub.ObjectValidators
alias Pleroma.Object
alias Pleroma.Web.ActivityPub.Utils
import Ecto.Changeset
import Pleroma.Web.ActivityPub.ObjectValidators.CommonValidations
@primary_key false
embedded_schema do
field(:id, ObjectValidators.ObjectID, primary_key: true)
field(:type, :string)
field(:object, ObjectValidators.ObjectID)
field(:actor, ObjectValidators.ObjectID)
field(:context, :string)
field(:to, ObjectValidators.Recipients, default: [])
field(:cc, ObjectValidators.Recipients, default: [])
end
def cast_and_validate(data) do
data
|> cast_data()
|> validate_data()
end
def cast_data(data) do
%__MODULE__{}
|> changeset(data)
end
def changeset(struct, data) do
struct
|> cast(data, __schema__(:fields))
|> fix_after_cast()
end
def fix_after_cast(cng) do
cng
|> fix_recipients()
|> fix_context()
end
def fix_context(cng) do
object = get_field(cng, :object)
with nil <- get_field(cng, :context),
%Object{data: %{"context" => context}} <- Object.get_cached_by_ap_id(object) do
cng
|> put_change(:context, context)
else
_ ->
cng
end
end
def fix_recipients(cng) do
to = get_field(cng, :to)
cc = get_field(cng, :cc)
object = get_field(cng, :object)
with {[], []} <- {to, cc},
%Object{data: %{"actor" => actor}} <- Object.get_cached_by_ap_id(object),
{:ok, actor} <- ObjectValidators.ObjectID.cast(actor) do
cng
|> put_change(:to, [actor])
else
_ ->
cng
end
end
def validate_data(data_cng) do
data_cng
|> validate_inclusion(:type, ["Like"])
|> validate_required([:id, :type, :object, :actor, :context, :to, :cc])
|> validate_actor_presence()
|> validate_object_presence()
|> validate_existing_like()
end
def validate_existing_like(%{changes: %{actor: actor, object: object}} = cng) do
if Utils.get_existing_like(actor, %{data: %{"id" => object}}) do
cng
|> add_error(:actor, "already liked this object")
|> add_error(:object, "already liked by this actor")
else
cng
end
end
def validate_existing_like(cng), do: cng
end
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