akkoma/lib/pleroma/web/mastodon_api/controllers/status_controller.ex

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

defmodule Pleroma.Web.MastodonAPI.StatusController do
  use Pleroma.Web, :controller

  import Pleroma.Web.MastodonAPI.MastodonAPIController, only: [try_render: 3]

  require Ecto.Query

  alias Pleroma.Activity
  alias Pleroma.Bookmark
  alias Pleroma.Object
  alias Pleroma.Plugs.RateLimiter
  alias Pleroma.Repo
  alias Pleroma.ScheduledActivity
  alias Pleroma.User
  alias Pleroma.Web.ActivityPub.ActivityPub
  alias Pleroma.Web.ActivityPub.Visibility
  alias Pleroma.Web.CommonAPI
  alias Pleroma.Web.MastodonAPI.AccountView
  alias Pleroma.Web.MastodonAPI.ScheduledActivityView
  alias Pleroma.Web.MastodonAPI.StatusView

  @rate_limited_status_actions ~w(reblog unreblog favourite unfavourite create delete)a

  plug(
    RateLimiter,
    {:status_id_action, bucket_name: "status_id_action:reblog_unreblog", params: ["id"]}
    when action in ~w(reblog unreblog)a
  )

  plug(
    RateLimiter,
    {:status_id_action, bucket_name: "status_id_action:fav_unfav", params: ["id"]}
    when action in ~w(favourite unfavourite)a
  )

  plug(RateLimiter, :statuses_actions when action in @rate_limited_status_actions)

  action_fallback(Pleroma.Web.MastodonAPI.FallbackController)

  @doc """
  GET `/api/v1/statuses?ids[]=1&ids[]=2`

  `ids` query param is required
  """
  def index(%{assigns: %{user: user}} = conn, %{"ids" => ids}) do
    limit = 100

    activities =
      ids
      |> Enum.take(limit)
      |> Activity.all_by_ids_with_object()
      |> Enum.filter(&Visibility.visible_for_user?(&1, user))

    render(conn, "index.json", activities: activities, for: user, as: :activity)
  end

  @doc """
  POST /api/v1/statuses

  Creates a scheduled status when `scheduled_at` param is present and it's far enough
  """
  def create(
        %{assigns: %{user: user}} = conn,
        %{"status" => _, "scheduled_at" => scheduled_at} = params
      ) do
    params = Map.put(params, "in_reply_to_status_id", params["in_reply_to_id"])

    if ScheduledActivity.far_enough?(scheduled_at) do
      with {:ok, scheduled_activity} <-
             ScheduledActivity.create(user, %{"params" => params, "scheduled_at" => scheduled_at}) do
        conn
        |> put_view(ScheduledActivityView)
        |> render("show.json", scheduled_activity: scheduled_activity)
      end
    else
      create(conn, Map.drop(params, ["scheduled_at"]))
    end
  end

  @doc """
  POST /api/v1/statuses

  Creates a regular status
  """
  def create(%{assigns: %{user: user}} = conn, %{"status" => _} = params) do
    params = Map.put(params, "in_reply_to_status_id", params["in_reply_to_id"])

    with {:ok, activity} <- CommonAPI.post(user, params) do
      try_render(conn, "show.json",
        activity: activity,
        for: user,
        as: :activity,
        with_direct_conversation_id: true
      )
    else
      {:error, message} ->
        conn
        |> put_status(:unprocessable_entity)
        |> json(%{error: message})
    end
  end

  @doc "GET /api/v1/statuses/:id"
  def show(%{assigns: %{user: user}} = conn, %{"id" => id}) do
    with %Activity{} = activity <- Activity.get_by_id_with_object(id),
         true <- Visibility.visible_for_user?(activity, user) do
      try_render(conn, "show.json", activity: activity, for: user)
    end
  end

  @doc "DELETE /api/v1/statuses/:id"
  def delete(%{assigns: %{user: user}} = conn, %{"id" => id}) do
    with {:ok, %Activity{}} <- CommonAPI.delete(id, user) do
      json(conn, %{})
    else
      _e -> render_error(conn, :forbidden, "Can't delete this post")
    end
  end

  @doc "POST /api/v1/statuses/:id/reblog"
  def reblog(%{assigns: %{user: user}} = conn, %{"id" => ap_id_or_id}) do
    with {:ok, announce, _activity} <- CommonAPI.repeat(ap_id_or_id, user),
         %Activity{} = announce <- Activity.normalize(announce.data) do
      try_render(conn, "show.json", %{activity: announce, for: user, as: :activity})
    end
  end

  @doc "POST /api/v1/statuses/:id/unreblog"
  def unreblog(%{assigns: %{user: user}} = conn, %{"id" => ap_id_or_id}) do
    with {:ok, _unannounce, %{data: %{"id" => id}}} <- CommonAPI.unrepeat(ap_id_or_id, user),
         %Activity{} = activity <- Activity.get_create_by_object_ap_id_with_object(id) do
      try_render(conn, "show.json", %{activity: activity, for: user, as: :activity})
    end
  end

  @doc "POST /api/v1/statuses/:id/favourite"
  def favourite(%{assigns: %{user: user}} = conn, %{"id" => ap_id_or_id}) do
    with {:ok, _fav, %{data: %{"id" => id}}} <- CommonAPI.favorite(ap_id_or_id, user),
         %Activity{} = activity <- Activity.get_create_by_object_ap_id(id) do
      try_render(conn, "show.json", activity: activity, for: user, as: :activity)
    end
  end

  @doc "POST /api/v1/statuses/:id/unfavourite"
  def unfavourite(%{assigns: %{user: user}} = conn, %{"id" => ap_id_or_id}) do
    with {:ok, _, _, %{data: %{"id" => id}}} <- CommonAPI.unfavorite(ap_id_or_id, user),
         %Activity{} = activity <- Activity.get_create_by_object_ap_id(id) do
      try_render(conn, "show.json", activity: activity, for: user, as: :activity)
    end
  end

  @doc "POST /api/v1/statuses/:id/pin"
  def pin(%{assigns: %{user: user}} = conn, %{"id" => ap_id_or_id}) do
    with {:ok, activity} <- CommonAPI.pin(ap_id_or_id, user) do
      try_render(conn, "show.json", activity: activity, for: user, as: :activity)
    end
  end

  @doc "POST /api/v1/statuses/:id/unpin"
  def unpin(%{assigns: %{user: user}} = conn, %{"id" => ap_id_or_id}) do
    with {:ok, activity} <- CommonAPI.unpin(ap_id_or_id, user) do
      try_render(conn, "show.json", activity: activity, for: user, as: :activity)
    end
  end

  @doc "POST /api/v1/statuses/:id/bookmark"
  def bookmark(%{assigns: %{user: user}} = conn, %{"id" => id}) do
    with %Activity{} = activity <- Activity.get_by_id_with_object(id),
         %User{} = user <- User.get_cached_by_nickname(user.nickname),
         true <- Visibility.visible_for_user?(activity, user),
         {:ok, _bookmark} <- Bookmark.create(user.id, activity.id) do
      try_render(conn, "show.json", activity: activity, for: user, as: :activity)
    end
  end

  @doc "POST /api/v1/statuses/:id/unbookmark"
  def unbookmark(%{assigns: %{user: user}} = conn, %{"id" => id}) do
    with %Activity{} = activity <- Activity.get_by_id_with_object(id),
         %User{} = user <- User.get_cached_by_nickname(user.nickname),
         true <- Visibility.visible_for_user?(activity, user),
         {:ok, _bookmark} <- Bookmark.destroy(user.id, activity.id) do
      try_render(conn, "show.json", activity: activity, for: user, as: :activity)
    end
  end

  @doc "POST /api/v1/statuses/:id/mute"
  def mute_conversation(%{assigns: %{user: user}} = conn, %{"id" => id}) do
    with %Activity{} = activity <- Activity.get_by_id(id),
         {:ok, activity} <- CommonAPI.add_mute(user, activity) do
      try_render(conn, "show.json", activity: activity, for: user, as: :activity)
    end
  end

  @doc "POST /api/v1/statuses/:id/unmute"
  def unmute_conversation(%{assigns: %{user: user}} = conn, %{"id" => id}) do
    with %Activity{} = activity <- Activity.get_by_id(id),
         {:ok, activity} <- CommonAPI.remove_mute(user, activity) do
      try_render(conn, "show.json", activity: activity, for: user, as: :activity)
    end
  end

  @doc "GET /api/v1/statuses/:id/card"
  def card(%{assigns: %{user: user}} = conn, %{"id" => status_id}) do
    with %Activity{} = activity <- Activity.get_by_id(status_id),
         true <- Visibility.visible_for_user?(activity, user) do
      data = Pleroma.Web.RichMedia.Helpers.fetch_data_for_activity(activity)
      render(conn, "card.json", data)
    else
      _ -> render_error(conn, :not_found, "Record not found")
    end
  end

  @doc "GET /api/v1/statuses/:id/favourited_by"
  def favourited_by(%{assigns: %{user: user}} = conn, %{"id" => id}) do
    with %Activity{} = activity <- Activity.get_by_id_with_object(id),
         {:visible, true} <- {:visible, Visibility.visible_for_user?(activity, user)},
         %Object{data: %{"likes" => likes}} <- Object.normalize(activity) do
      users =
        User
        |> Ecto.Query.where([u], u.ap_id in ^likes)
        |> Repo.all()
        |> Enum.filter(&(not User.blocks?(user, &1)))

      conn
      |> put_view(AccountView)
      |> render("accounts.json", for: user, users: users, as: :user)
    else
      {:visible, false} -> {:error, :not_found}
      _ -> json(conn, [])
    end
  end

  @doc "GET /api/v1/statuses/:id/reblogged_by"
  def reblogged_by(%{assigns: %{user: user}} = conn, %{"id" => id}) do
    with %Activity{} = activity <- Activity.get_by_id_with_object(id),
         {:visible, true} <- {:visible, Visibility.visible_for_user?(activity, user)},
         %Object{data: %{"announcements" => announces}} <- Object.normalize(activity) do
      users =
        User
        |> Ecto.Query.where([u], u.ap_id in ^announces)
        |> Repo.all()
        |> Enum.filter(&(not User.blocks?(user, &1)))

      conn
      |> put_view(AccountView)
      |> render("accounts.json", for: user, users: users, as: :user)
    else
      {:visible, false} -> {:error, :not_found}
      _ -> json(conn, [])
    end
  end

  @doc "GET /api/v1/statuses/:id/context"
  def context(%{assigns: %{user: user}} = conn, %{"id" => id}) do
    with %Activity{} = activity <- Activity.get_by_id(id) do
      activities =
        ActivityPub.fetch_activities_for_context(activity.data["context"], %{
          "blocking_user" => user,
          "user" => user,
          "exclude_id" => activity.id
        })

      # TODO: Move to view
      grouped_activities = Enum.group_by(activities, fn %{id: id} -> id < activity.id end)

      result = %{
        ancestors:
          StatusView.render(
            "index.json",
            for: user,
            activities: grouped_activities[true] || [],
            as: :activity
          )
          |> Enum.reverse(),
        # credo:disable-for-previous-line Credo.Check.Refactor.PipeChainStart
        descendants:
          StatusView.render(
            "index.json",
            for: user,
            activities: grouped_activities[false] || [],
            as: :activity
          )
          |> Enum.reverse()
        # credo:disable-for-previous-line Credo.Check.Refactor.PipeChainStart
      }

      json(conn, result)
    end
  end
end