git.squeep.com Git - akkoma/blob - lib/pleroma/object.ex

   1 # Pleroma: A lightweight social networking server
   2 # Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
   3 # SPDX-License-Identifier: AGPL-3.0-only
   4
   5 defmodule Pleroma.Object do
   6   use Ecto.Schema
   7
   8   alias Pleroma.Activity
   9   alias Pleroma.Object
  10   alias Pleroma.Object.Fetcher
  11   alias Pleroma.ObjectTombstone
  12   alias Pleroma.Repo
  13   alias Pleroma.User
  14
  15   import Ecto.Query
  16   import Ecto.Changeset
  17
  18   require Logger
  19
  20   schema "objects" do
  21     field(:data, :map)
  22
  23     timestamps()
  24   end
  25
  26   def create(data) do
  27     Object.change(%Object{}, %{data: data})
  28     |> Repo.insert()
  29   end
  30
  31   def change(struct, params \\ %{}) do
  32     struct
  33     |> cast(params, [:data])
  34     |> validate_required([:data])
  35     |> unique_constraint(:ap_id, name: :objects_unique_apid_index)
  36   end
  37
  38   def get_by_id(nil), do: nil
  39   def get_by_id(id), do: Repo.get(Object, id)
  40
  41   def get_by_ap_id(nil), do: nil
  42
  43   def get_by_ap_id(ap_id) do
  44     Repo.one(from(object in Object, where: fragment("(?)->>'id' = ?", object.data, ^ap_id)))
  45   end
  46
  47   defp warn_on_no_object_preloaded(ap_id) do
  48     "Object.normalize() called without preloaded object (#{ap_id}). Consider preloading the object"
  49     |> Logger.debug()
  50
  51     Logger.debug("Backtrace: #{inspect(Process.info(:erlang.self(), :current_stacktrace))}")
  52   end
  53
  54   def normalize(_, fetch_remote \\ true, options \\ [])
  55
  56   # If we pass an Activity to Object.normalize(), we can try to use the preloaded object.
  57   # Use this whenever possible, especially when walking graphs in an O(N) loop!
  58   def normalize(%Object{} = object, _, _), do: object
  59   def normalize(%Activity{object: %Object{} = object}, _, _), do: object
  60
  61   # A hack for fake activities
  62   def normalize(%Activity{data: %{"object" => %{"fake" => true} = data}}, _, _) do
  63     %Object{id: "pleroma:fake_object_id", data: data}
  64   end
  65
  66   # No preloaded object
  67   def normalize(%Activity{data: %{"object" => %{"id" => ap_id}}}, fetch_remote, _) do
  68     warn_on_no_object_preloaded(ap_id)
  69     normalize(ap_id, fetch_remote)
  70   end
  71
  72   # No preloaded object
  73   def normalize(%Activity{data: %{"object" => ap_id}}, fetch_remote, _) do
  74     warn_on_no_object_preloaded(ap_id)
  75     normalize(ap_id, fetch_remote)
  76   end
  77
  78   # Old way, try fetching the object through cache.
  79   def normalize(%{"id" => ap_id}, fetch_remote, _), do: normalize(ap_id, fetch_remote)
  80   def normalize(ap_id, false, _) when is_binary(ap_id), do: get_cached_by_ap_id(ap_id)
  81
  82   def normalize(ap_id, true, options) when is_binary(ap_id) do
  83     Fetcher.fetch_object_from_id!(ap_id, options)
  84   end
  85
  86   def normalize(_, _, _), do: nil
  87
  88   # Owned objects can only be mutated by their owner
  89   def authorize_mutation(%Object{data: %{"actor" => actor}}, %User{ap_id: ap_id}),
  90     do: actor == ap_id
  91
  92   # Legacy objects can be mutated by anybody
  93   def authorize_mutation(%Object{}, %User{}), do: true
  94
  95   def get_cached_by_ap_id(ap_id) do
  96     key = "object:#{ap_id}"
  97
  98     Cachex.fetch!(:object_cache, key, fn _ ->
  99       object = get_by_ap_id(ap_id)
 100
 101       if object do
 102         {:commit, object}
 103       else
 104         {:ignore, object}
 105       end
 106     end)
 107   end
 108
 109   def context_mapping(context) do
 110     Object.change(%Object{}, %{data: %{"id" => context}})
 111   end
 112
 113   def make_tombstone(%Object{data: %{"id" => id, "type" => type}}, deleted \\ DateTime.utc_now()) do
 114     %ObjectTombstone{
 115       id: id,
 116       formerType: type,
 117       deleted: deleted
 118     }
 119     |> Map.from_struct()
 120   end
 121
 122   def swap_object_with_tombstone(object) do
 123     tombstone = make_tombstone(object)
 124
 125     object
 126     |> Object.change(%{data: tombstone})
 127     |> Repo.update()
 128   end
 129
 130   def delete(%Object{data: %{"id" => id}} = object) do
 131     with {:ok, _obj} = swap_object_with_tombstone(object),
 132          deleted_activity = Activity.delete_by_ap_id(id),
 133          {:ok, true} <- Cachex.del(:object_cache, "object:#{id}") do
 134       {:ok, object, deleted_activity}
 135     end
 136   end
 137
 138   def prune(%Object{data: %{"id" => id}} = object) do
 139     with {:ok, object} <- Repo.delete(object),
 140          {:ok, true} <- Cachex.del(:object_cache, "object:#{id}") do
 141       {:ok, object}
 142     end
 143   end
 144
 145   def set_cache(%Object{data: %{"id" => ap_id}} = object) do
 146     Cachex.put(:object_cache, "object:#{ap_id}", object)
 147     {:ok, object}
 148   end
 149
 150   def update_and_set_cache(changeset) do
 151     with {:ok, object} <- Repo.update(changeset) do
 152       set_cache(object)
 153     end
 154   end
 155
 156   def increase_replies_count(ap_id) do
 157     Object
 158     |> where([o], fragment("?->>'id' = ?::text", o.data, ^to_string(ap_id)))
 159     |> update([o],
 160       set: [
 161         data:
 162           fragment(
 163             """
 164             jsonb_set(?, '{repliesCount}',
 165               (coalesce((?->>'repliesCount')::int, 0) + 1)::varchar::jsonb, true)
 166             """,
 167             o.data,
 168             o.data
 169           )
 170       ]
 171     )
 172     |> Repo.update_all([])
 173     |> case do
 174       {1, [object]} -> set_cache(object)
 175       _ -> {:error, "Not found"}
 176     end
 177   end
 178
 179   def decrease_replies_count(ap_id) do
 180     Object
 181     |> where([o], fragment("?->>'id' = ?::text", o.data, ^to_string(ap_id)))
 182     |> update([o],
 183       set: [
 184         data:
 185           fragment(
 186             """
 187             jsonb_set(?, '{repliesCount}',
 188               (greatest(0, (?->>'repliesCount')::int - 1))::varchar::jsonb, true)
 189             """,
 190             o.data,
 191             o.data
 192           )
 193       ]
 194     )
 195     |> Repo.update_all([])
 196     |> case do
 197       {1, [object]} -> set_cache(object)
 198       _ -> {:error, "Not found"}
 199     end
 200   end
 201
 202   def increase_vote_count(ap_id, name) do
 203     with %Object{} = object <- Object.normalize(ap_id),
 204          "Question" <- object.data["type"] do
 205       multiple = Map.has_key?(object.data, "anyOf")
 206
 207       options =
 208         (object.data["anyOf"] || object.data["oneOf"] || [])
 209         |> Enum.map(fn
 210           %{"name" => ^name} = option ->
 211             Kernel.update_in(option["replies"]["totalItems"], &(&1 + 1))
 212
 213           option ->
 214             option
 215         end)
 216
 217       data =
 218         if multiple do
 219           Map.put(object.data, "anyOf", options)
 220         else
 221           Map.put(object.data, "oneOf", options)
 222         end
 223
 224       object
 225       |> Object.change(%{data: data})
 226       |> update_and_set_cache()
 227     else
 228       _ -> :noop
 229     end
 230   end
 231 end