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   1 # Pleroma: A lightweight social networking server
   2 # Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
   3 # SPDX-License-Identifier: AGPL-3.0-only
   4
   5 defmodule Pleroma.Web.ActivityPub.ObjectValidators.LikeValidator do
   6   use Ecto.Schema
   7
   8   alias Pleroma.Object
   9   alias Pleroma.Web.ActivityPub.ObjectValidators.CommonFixes
  10   alias Pleroma.Web.ActivityPub.Utils
  11
  12   import Ecto.Changeset
  13   import Pleroma.Web.ActivityPub.ObjectValidators.CommonValidations
  14
  15   @primary_key false
  16
  17   embedded_schema do
  18     quote do
  19       unquote do
  20         import Elixir.Pleroma.Web.ActivityPub.ObjectValidators.CommonFields
  21         message_fields()
  22         activity_fields()
  23       end
  24     end
  25
  26     field(:context, :string)
  27   end
  28
  29   def cast_and_validate(data) do
  30     data
  31     |> cast_data()
  32     |> validate_data()
  33   end
  34
  35   def cast_data(data) do
  36     data =
  37       data
  38       |> fix()
  39
  40     %__MODULE__{}
  41     |> changeset(data)
  42   end
  43
  44   def changeset(struct, data) do
  45     struct
  46     |> cast(data, __schema__(:fields))
  47   end
  48
  49   defp fix(data) do
  50     data =
  51       data
  52       |> CommonFixes.fix_actor()
  53       |> CommonFixes.fix_activity_addressing()
  54
  55     with %Object{} = object <- Object.normalize(data["object"]) do
  56       data
  57       |> CommonFixes.fix_activity_context(object)
  58       |> CommonFixes.fix_object_action_recipients(object)
  59     else
  60       _ -> data
  61     end
  62   end
  63
  64   defp validate_data(data_cng) do
  65     data_cng
  66     |> validate_inclusion(:type, ["Like"])
  67     |> validate_required([:id, :type, :object, :actor, :context, :to, :cc])
  68     |> validate_actor_presence()
  69     |> validate_object_presence()
  70     |> validate_existing_like()
  71   end
  72
  73   defp validate_existing_like(%{changes: %{actor: actor, object: object}} = cng) do
  74     if Utils.get_existing_like(actor, %{data: %{"id" => object}}) do
  75       cng
  76       |> add_error(:actor, "already liked this object")
  77       |> add_error(:object, "already liked by this actor")
  78     else
  79       cng
  80     end
  81   end
  82
  83   defp validate_existing_like(cng), do: cng
  84 end