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   1 # Pleroma: A lightweight social networking server
   2 # Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
   3 # SPDX-License-Identifier: AGPL-3.0-only
   4
   5 defmodule Pleroma.Web.MastodonAPI.MastodonAPI do
   6   import Ecto.Query
   7   import Ecto.Changeset
   8
   9   alias Pleroma.Activity
  10   alias Pleroma.Notification
  11   alias Pleroma.Pagination
  12   alias Pleroma.ScheduledActivity
  13   alias Pleroma.User
  14   alias Pleroma.Web.CommonAPI
  15
  16   @spec follow(User.t(), User.t(), map) :: {:ok, User.t()} | {:error, String.t()}
  17   def follow(follower, followed, params \\ %{}) do
  18     result =
  19       if not User.following?(follower, followed) do
  20         CommonAPI.follow(follower, followed)
  21       else
  22         {:ok, follower, followed, nil}
  23       end
  24
  25     with {:ok, follower, _followed, _} <- result do
  26       options = cast_params(params)
  27       set_reblogs_visibility(options[:reblogs], result)
  28       {:ok, follower}
  29     end
  30   end
  31
  32   defp set_reblogs_visibility(false, {:ok, follower, followed, _}) do
  33     CommonAPI.hide_reblogs(follower, followed)
  34   end
  35
  36   defp set_reblogs_visibility(_, {:ok, follower, followed, _}) do
  37     CommonAPI.show_reblogs(follower, followed)
  38   end
  39
  40   @spec get_followers(User.t(), map()) :: list(User.t())
  41   def get_followers(user, params \\ %{}) do
  42     user
  43     |> User.get_followers_query()
  44     |> Pagination.fetch_paginated(params)
  45   end
  46
  47   def get_friends(user, params \\ %{}) do
  48     user
  49     |> User.get_friends_query()
  50     |> Pagination.fetch_paginated(params)
  51   end
  52
  53   def get_notifications(user, params \\ %{}) do
  54     options = cast_params(params)
  55
  56     user
  57     |> Notification.for_user_query(options)
  58     |> restrict(:exclude_types, options)
  59     |> restrict(:account_ap_id, options)
  60     |> Pagination.fetch_paginated(params)
  61   end
  62
  63   def get_scheduled_activities(user, params \\ %{}) do
  64     user
  65     |> ScheduledActivity.for_user_query()
  66     |> Pagination.fetch_paginated(params)
  67   end
  68
  69   defp cast_params(params) do
  70     param_types = %{
  71       exclude_types: {:array, :string},
  72       exclude_visibilities: {:array, :string},
  73       reblogs: :boolean,
  74       with_muted: :boolean,
  75       account_ap_id: :string
  76     }
  77
  78     changeset = cast({%{}, param_types}, params, Map.keys(param_types))
  79     changeset.changes
  80   end
  81
  82   defp restrict(query, :exclude_types, %{exclude_types: mastodon_types = [_ | _]}) do
  83     ap_types =
  84       mastodon_types
  85       |> Enum.map(&Activity.from_mastodon_notification_type/1)
  86       |> Enum.filter(& &1)
  87
  88     query
  89     |> where([q, a], not fragment("? @> ARRAY[?->>'type']::varchar[]", ^ap_types, a.data))
  90   end
  91
  92   defp restrict(query, :account_ap_id, %{account_ap_id: account_ap_id}) do
  93     where(query, [n, a], a.actor == ^account_ap_id)
  94   end
  95
  96   defp restrict(query, _, _), do: query
  97 end