total rebase
[anni] / lib / pleroma / web / activity_pub / object_validators / announce_validator.ex
1 # Pleroma: A lightweight social networking server
2 # Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
3 # SPDX-License-Identifier: AGPL-3.0-only
4
5 defmodule Pleroma.Web.ActivityPub.ObjectValidators.AnnounceValidator do
6   use Ecto.Schema
7
8   alias Pleroma.EctoType.ActivityPub.ObjectValidators
9   alias Pleroma.Object
10   alias Pleroma.User
11   alias Pleroma.Web.ActivityPub.ObjectValidators.CommonFixes
12   alias Pleroma.Web.ActivityPub.Utils
13   alias Pleroma.Web.ActivityPub.Visibility
14
15   import Ecto.Changeset
16   import Pleroma.Web.ActivityPub.ObjectValidators.CommonValidations
17
18   require Pleroma.Constants
19
20   @primary_key false
21
22   embedded_schema do
23     quote do
24       unquote do
25         import Elixir.Pleroma.Web.ActivityPub.ObjectValidators.CommonFields
26         message_fields()
27         activity_fields()
28       end
29     end
30
31     field(:context, :string)
32     field(:published, ObjectValidators.DateTime)
33   end
34
35   def cast_and_validate(data) do
36     data
37     |> cast_data()
38     |> validate_data()
39   end
40
41   def cast_data(data) do
42     data =
43       data
44       |> fix()
45
46     %__MODULE__{}
47     |> changeset(data)
48   end
49
50   def changeset(struct, data) do
51     struct
52     |> cast(data, __schema__(:fields))
53   end
54
55   defp fix(data) do
56     data =
57       data
58       |> CommonFixes.fix_actor()
59       |> CommonFixes.fix_activity_addressing()
60
61     with %Object{} = object <- Object.normalize(data["object"]) do
62       data
63       |> CommonFixes.fix_activity_context(object)
64       |> CommonFixes.fix_object_action_recipients(object)
65     else
66       _ -> data
67     end
68   end
69
70   defp validate_data(data_cng) do
71     data_cng
72     |> validate_inclusion(:type, ["Announce"])
73     |> validate_required([:id, :type, :object, :actor, :to, :cc])
74     |> validate_actor_presence()
75     |> validate_object_presence()
76     |> validate_existing_announce()
77     |> validate_announcable()
78   end
79
80   defp validate_announcable(cng) do
81     with actor when is_binary(actor) <- get_field(cng, :actor),
82          object when is_binary(object) <- get_field(cng, :object),
83          %User{} = actor <- User.get_cached_by_ap_id(actor),
84          %Object{} = object <- Object.get_cached_by_ap_id(object),
85          false <- Visibility.public?(object) do
86       same_actor = object.data["actor"] == actor.ap_id
87       recipients = get_field(cng, :to) ++ get_field(cng, :cc)
88       local_public = Utils.as_local_public()
89
90       is_public =
91         Enum.member?(recipients, Pleroma.Constants.as_public()) or
92           Enum.member?(recipients, local_public)
93
94       cond do
95         same_actor && is_public ->
96           cng
97           |> add_error(:actor, "can not announce this object publicly")
98
99         !same_actor ->
100           cng
101           |> add_error(:actor, "can not announce this object")
102
103         true ->
104           cng
105       end
106     else
107       _ -> cng
108     end
109   end
110
111   defp validate_existing_announce(cng) do
112     actor = get_field(cng, :actor)
113     object = get_field(cng, :object)
114
115     if actor && object && Utils.get_existing_announce(actor, %{data: %{"id" => object}}) do
116       cng
117       |> add_error(:actor, "already announced this object")
118       |> add_error(:object, "already announced by this actor")
119     else
120       cng
121     end
122   end
123 end