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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.ActivityPub.ObjectValidator do
   6   @moduledoc """
   7   This module is responsible for validating an object (which can be an activity)
   8   and checking if it is both well formed and also compatible with our view of
   9   the system.
  10   """
  11
  12   alias Pleroma.EctoType.ActivityPub.ObjectValidators
  13   alias Pleroma.Object
  14   alias Pleroma.User
  15   alias Pleroma.Web.ActivityPub.ObjectValidators.AnnounceValidator
  16   alias Pleroma.Web.ActivityPub.ObjectValidators.BlockValidator
  17   alias Pleroma.Web.ActivityPub.ObjectValidators.ChatMessageValidator
  18   alias Pleroma.Web.ActivityPub.ObjectValidators.CreateChatMessageValidator
  19   alias Pleroma.Web.ActivityPub.ObjectValidators.DeleteValidator
  20   alias Pleroma.Web.ActivityPub.ObjectValidators.EmojiReactValidator
  21   alias Pleroma.Web.ActivityPub.ObjectValidators.FollowValidator
  22   alias Pleroma.Web.ActivityPub.ObjectValidators.LikeValidator
  23   alias Pleroma.Web.ActivityPub.ObjectValidators.UndoValidator
  24   alias Pleroma.Web.ActivityPub.ObjectValidators.UpdateValidator
  25
  26   @spec validate(map(), keyword()) :: {:ok, map(), keyword()} | {:error, any()}
  27   def validate(object, meta)
  28
  29   def validate(%{"type" => "Follow"} = object, meta) do
  30     with {:ok, object} <-
  31            object
  32            |> FollowValidator.cast_and_validate()
  33            |> Ecto.Changeset.apply_action(:insert) do
  34       object = stringify_keys(object)
  35       {:ok, object, meta}
  36     end
  37   end
  38
  39   def validate(%{"type" => "Block"} = block_activity, meta) do
  40     with {:ok, block_activity} <-
  41            block_activity
  42            |> BlockValidator.cast_and_validate()
  43            |> Ecto.Changeset.apply_action(:insert) do
  44       block_activity = stringify_keys(block_activity)
  45       outgoing_blocks = Pleroma.Config.get([:activitypub, :outgoing_blocks])
  46
  47       meta =
  48         if !outgoing_blocks do
  49           Keyword.put(meta, :do_not_federate, true)
  50         else
  51           meta
  52         end
  53
  54       {:ok, block_activity, meta}
  55     end
  56   end
  57
  58   def validate(%{"type" => "Update"} = update_activity, meta) do
  59     with {:ok, update_activity} <-
  60            update_activity
  61            |> UpdateValidator.cast_and_validate()
  62            |> Ecto.Changeset.apply_action(:insert) do
  63       update_activity = stringify_keys(update_activity)
  64       {:ok, update_activity, meta}
  65     end
  66   end
  67
  68   def validate(%{"type" => "Undo"} = object, meta) do
  69     with {:ok, object} <-
  70            object
  71            |> UndoValidator.cast_and_validate()
  72            |> Ecto.Changeset.apply_action(:insert) do
  73       object = stringify_keys(object)
  74       {:ok, object, meta}
  75     end
  76   end
  77
  78   def validate(%{"type" => "Delete"} = object, meta) do
  79     with cng <- DeleteValidator.cast_and_validate(object),
  80          do_not_federate <- DeleteValidator.do_not_federate?(cng),
  81          {:ok, object} <- Ecto.Changeset.apply_action(cng, :insert) do
  82       object = stringify_keys(object)
  83       meta = Keyword.put(meta, :do_not_federate, do_not_federate)
  84       {:ok, object, meta}
  85     end
  86   end
  87
  88   def validate(%{"type" => "Like"} = object, meta) do
  89     with {:ok, object} <-
  90            object
  91            |> LikeValidator.cast_and_validate()
  92            |> Ecto.Changeset.apply_action(:insert) do
  93       object = stringify_keys(object)
  94       {:ok, object, meta}
  95     end
  96   end
  97
  98   def validate(%{"type" => "ChatMessage"} = object, meta) do
  99     with {:ok, object} <-
 100            object
 101            |> ChatMessageValidator.cast_and_validate()
 102            |> Ecto.Changeset.apply_action(:insert) do
 103       object = stringify_keys(object)
 104       {:ok, object, meta}
 105     end
 106   end
 107
 108   def validate(%{"type" => "EmojiReact"} = object, meta) do
 109     with {:ok, object} <-
 110            object
 111            |> EmojiReactValidator.cast_and_validate()
 112            |> Ecto.Changeset.apply_action(:insert) do
 113       object = stringify_keys(object |> Map.from_struct())
 114       {:ok, object, meta}
 115     end
 116   end
 117
 118   def validate(%{"type" => "Create", "object" => object} = create_activity, meta) do
 119     with {:ok, object_data} <- cast_and_apply(object),
 120          meta = Keyword.put(meta, :object_data, object_data |> stringify_keys),
 121          {:ok, create_activity} <-
 122            create_activity
 123            |> CreateChatMessageValidator.cast_and_validate(meta)
 124            |> Ecto.Changeset.apply_action(:insert) do
 125       create_activity = stringify_keys(create_activity)
 126       {:ok, create_activity, meta}
 127     end
 128   end
 129
 130   def validate(%{"type" => "Announce"} = object, meta) do
 131     with {:ok, object} <-
 132            object
 133            |> AnnounceValidator.cast_and_validate()
 134            |> Ecto.Changeset.apply_action(:insert) do
 135       object = stringify_keys(object |> Map.from_struct())
 136       {:ok, object, meta}
 137     end
 138   end
 139
 140   def cast_and_apply(%{"type" => "ChatMessage"} = object) do
 141     ChatMessageValidator.cast_and_apply(object)
 142   end
 143
 144   def cast_and_apply(o), do: {:error, {:validator_not_set, o}}
 145
 146   def stringify_keys(%{__struct__: _} = object) do
 147     object
 148     |> Map.from_struct()
 149     |> stringify_keys
 150   end
 151
 152   def stringify_keys(object) when is_map(object) do
 153     object
 154     |> Map.new(fn {key, val} -> {to_string(key), stringify_keys(val)} end)
 155   end
 156
 157   def stringify_keys(object) when is_list(object) do
 158     object
 159     |> Enum.map(&stringify_keys/1)
 160   end
 161
 162   def stringify_keys(object), do: object
 163
 164   def fetch_actor(object) do
 165     with {:ok, actor} <- ObjectValidators.ObjectID.cast(object["actor"]) do
 166       User.get_or_fetch_by_ap_id(actor)
 167     end
 168   end
 169
 170   def fetch_actor_and_object(object) do
 171     fetch_actor(object)
 172     Object.normalize(object["object"], true)
 173     :ok
 174   end
 175 end