Pleroma/lib/pleroma/activity.ex

# Pleroma: A lightweight social networking server
# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only

defmodule Pleroma.Activity do
  use Ecto.Schema

  alias Pleroma.Activity
  alias Pleroma.Notification
  alias Pleroma.Object
  alias Pleroma.Repo

  import Ecto.Query

  @type t :: %__MODULE__{}
  @primary_key {:id, Pleroma.FlakeId, autogenerate: true}

  # https://github.com/tootsuite/mastodon/blob/master/app/models/notification.rb#L19
  @mastodon_notification_types %{
    "Create" => "mention",
    "Follow" => "follow",
    "Announce" => "reblog",
    "Like" => "favourite"
  }

  @mastodon_to_ap_notification_types for {k, v} <- @mastodon_notification_types,
                                         into: %{},
                                         do: {v, k}

  schema "activities" do
    field(:data, :map)
    field(:local, :boolean, default: true)
    field(:actor, :string)
    field(:recipients, {:array, :string})
    has_many(:notifications, Notification, on_delete: :delete_all)

    # Attention: this is a fake relation, don't try to preload it blindly and expect it to work!
    # The foreign key is embedded in a jsonb field.
    #
    # To use it, you probably want to do an inner join and a preload:
    #
    # ```
    # |> join(:inner, [activity], o in Object,
    #      on: fragment("(?->>'id') = COALESCE((?)->'object'->> 'id', (?)->>'object')",
    #        o.data, activity.data, activity.data))
    # |> preload([activity, object], [object: object])
    # ```
    #
    # As a convenience, Activity.with_preloaded_object() sets up an inner join and preload for the
    # typical case.
    has_one(:object, Object, on_delete: :nothing, foreign_key: :id)

    timestamps()
  end

  def with_preloaded_object(query) do
    query
    |> join(
      :inner,
      [activity],
      o in Object,
      on:
        fragment(
          "(?->>'id') = COALESCE(?->'object'->>'id', ?->>'object')",
          o.data,
          activity.data,
          activity.data
        )
    )
    |> preload([activity, object], object: object)
  end

  def get_by_ap_id(ap_id) do
    Repo.one(
      from(
        activity in Activity,
        where: fragment("(?)->>'id' = ?", activity.data, ^to_string(ap_id))
      )
    )
  end

  def get_by_ap_id_with_object(ap_id) do
    Repo.one(
      from(
        activity in Activity,
        where: fragment("(?)->>'id' = ?", activity.data, ^to_string(ap_id)),
        left_join: o in Object,
        on:
          fragment(
            "(?->>'id') = COALESCE(?->'object'->>'id', ?->>'object')",
            o.data,
            activity.data,
            activity.data
          ),
        preload: [object: o]
      )
    )
  end

  def get_by_id(id) do
    Repo.get(Activity, id)
  end

  def get_by_id_with_object(id) do
    from(activity in Activity,
      where: activity.id == ^id,
      inner_join: o in Object,
      on:
        fragment(
          "(?->>'id') = COALESCE(?->'object'->>'id', ?->>'object')",
          o.data,
          activity.data,
          activity.data
        ),
      preload: [object: o]
    )
    |> Repo.one()
  end

  def by_object_ap_id(ap_id) do
    from(
      activity in Activity,
      where:
        fragment(
          "coalesce((?)->'object'->>'id', (?)->>'object') = ?",
          activity.data,
          activity.data,
          ^to_string(ap_id)
        )
    )
  end

  def create_by_object_ap_id(ap_ids) when is_list(ap_ids) do
    from(
      activity in Activity,
      where:
        fragment(
          "coalesce((?)->'object'->>'id', (?)->>'object') = ANY(?)",
          activity.data,
          activity.data,
          ^ap_ids
        ),
      where: fragment("(?)->>'type' = 'Create'", activity.data)
    )
  end

  def create_by_object_ap_id(ap_id) when is_binary(ap_id) do
    from(
      activity in Activity,
      where:
        fragment(
          "coalesce((?)->'object'->>'id', (?)->>'object') = ?",
          activity.data,
          activity.data,
          ^to_string(ap_id)
        ),
      where: fragment("(?)->>'type' = 'Create'", activity.data)
    )
  end

  def create_by_object_ap_id(_), do: nil

  def get_all_create_by_object_ap_id(ap_id) do
    Repo.all(create_by_object_ap_id(ap_id))
  end

  def get_create_by_object_ap_id(ap_id) when is_binary(ap_id) do
    create_by_object_ap_id(ap_id)
    |> Repo.one()
  end

  def get_create_by_object_ap_id(_), do: nil

  def create_by_object_ap_id_with_object(ap_id) when is_binary(ap_id) do
    from(
      activity in Activity,
      where:
        fragment(
          "coalesce((?)->'object'->>'id', (?)->>'object') = ?",
          activity.data,
          activity.data,
          ^to_string(ap_id)
        ),
      where: fragment("(?)->>'type' = 'Create'", activity.data),
      inner_join: o in Object,
      on:
        fragment(
          "(?->>'id') = COALESCE(?->'object'->>'id', ?->>'object')",
          o.data,
          activity.data,
          activity.data
        ),
      preload: [object: o]
    )
  end

  def create_by_object_ap_id_with_object(_), do: nil

  def get_create_by_object_ap_id_with_object(ap_id) do
    ap_id
    |> create_by_object_ap_id_with_object()
    |> Repo.one()
  end

  def normalize(obj) when is_map(obj), do: get_by_ap_id_with_object(obj["id"])
  def normalize(ap_id) when is_binary(ap_id), do: get_by_ap_id_with_object(ap_id)
  def normalize(_), do: nil

  def get_in_reply_to_activity(%Activity{data: %{"object" => %{"inReplyTo" => ap_id}}}) do
    get_create_by_object_ap_id(ap_id)
  end

  def get_in_reply_to_activity(_), do: nil

  def delete_by_ap_id(id) when is_binary(id) do
    by_object_ap_id(id)
    |> select([u], u)
    |> Repo.delete_all()
    |> elem(1)
    |> Enum.find(fn
      %{data: %{"type" => "Create", "object" => %{"id" => ap_id}}} -> ap_id == id
      _ -> nil
    end)
  end

  def delete_by_ap_id(_), do: nil

  for {ap_type, type} <- @mastodon_notification_types do
    def mastodon_notification_type(%Activity{data: %{"type" => unquote(ap_type)}}),
      do: unquote(type)
  end

  def mastodon_notification_type(%Activity{}), do: nil

  def from_mastodon_notification_type(type) do
    Map.get(@mastodon_to_ap_notification_types, type)
  end

  def all_by_actor_and_id(actor, status_ids \\ [])
  def all_by_actor_and_id(_actor, []), do: []

  def all_by_actor_and_id(actor, status_ids) do
    Activity
    |> where([s], s.id in ^status_ids)
    |> where([s], s.actor == ^actor)
    |> Repo.all()
  end

  def increase_replies_count(id) do
    Activity
    |> where(id: ^id)
    |> update([a],
      set: [
        data:
          fragment(
            """
            jsonb_set(?, '{object, repliesCount}',
              (coalesce((?->'object'->>'repliesCount')::int, 0) + 1)::varchar::jsonb, true)
            """,
            a.data,
            a.data
          )
      ]
    )
    |> Repo.update_all([])
    |> case do
      {1, [activity]} -> activity
      _ -> {:error, "Not found"}
    end
  end

  def decrease_replies_count(id) do
    Activity
    |> where(id: ^id)
    |> update([a],
      set: [
        data:
          fragment(
            """
            jsonb_set(?, '{object, repliesCount}',
              (greatest(0, (?->'object'->>'repliesCount')::int - 1))::varchar::jsonb, true)
            """,
            a.data,
            a.data
          )
      ]
    )
    |> Repo.update_all([])
    |> case do
      {1, [activity]} -> activity
      _ -> {:error, "Not found"}
    end
  end
end