summaryrefslogtreecommitdiff
path: root/lib/pleroma/web/activity_pub/builder.ex
blob: f56bfc600ecce9b24c061b1485a21e376368bc41 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
# Pleroma: A lightweight social networking server
# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only

defmodule Pleroma.Web.ActivityPub.Builder do
  @moduledoc """
  This module builds the objects. Meant to be used for creating local objects.

  This module encodes our addressing policies and general shape of our objects.
  """

  alias Pleroma.Emoji
  alias Pleroma.Object
  alias Pleroma.User
  alias Pleroma.Web.ActivityPub.Relay
  alias Pleroma.Web.ActivityPub.Utils
  alias Pleroma.Web.ActivityPub.Visibility

  require Pleroma.Constants

  def accept_or_reject(actor, activity, type) do
    data = %{
      "id" => Utils.generate_activity_id(),
      "actor" => actor.ap_id,
      "type" => type,
      "object" => activity.data["id"],
      "to" => [activity.actor]
    }

    {:ok, data, []}
  end

  @spec reject(User.t(), Activity.t()) :: {:ok, map(), keyword()}
  def reject(actor, rejected_activity) do
    accept_or_reject(actor, rejected_activity, "Reject")
  end

  @spec accept(User.t(), Activity.t()) :: {:ok, map(), keyword()}
  def accept(actor, accepted_activity) do
    accept_or_reject(actor, accepted_activity, "Accept")
  end

  @spec follow(User.t(), User.t()) :: {:ok, map(), keyword()}
  def follow(follower, followed) do
    data = %{
      "id" => Utils.generate_activity_id(),
      "actor" => follower.ap_id,
      "type" => "Follow",
      "object" => followed.ap_id,
      "to" => [followed.ap_id]
    }

    {:ok, data, []}
  end

  @spec emoji_react(User.t(), Object.t(), String.t()) :: {:ok, map(), keyword()}
  def emoji_react(actor, object, emoji) do
    with {:ok, data, meta} <- object_action(actor, object) do
      data =
        data
        |> Map.put("content", emoji)
        |> Map.put("type", "EmojiReact")

      {:ok, data, meta}
    end
  end

  @spec undo(User.t(), Activity.t()) :: {:ok, map(), keyword()}
  def undo(actor, object) do
    {:ok,
     %{
       "id" => Utils.generate_activity_id(),
       "actor" => actor.ap_id,
       "type" => "Undo",
       "object" => object.data["id"],
       "to" => object.data["to"] || [],
       "cc" => object.data["cc"] || []
     }, []}
  end

  @spec delete(User.t(), String.t()) :: {:ok, map(), keyword()}
  def delete(actor, object_id) do
    object = Object.normalize(object_id, fetch: false)

    user = !object && User.get_cached_by_ap_id(object_id)

    to =
      case {object, user} do
        {%Object{}, _} ->
          # We are deleting an object, address everyone who was originally mentioned
          (object.data["to"] || []) ++ (object.data["cc"] || [])

        {_, %User{follower_address: follower_address}} ->
          # We are deleting a user, address the followers of that user
          [follower_address]
      end

    {:ok,
     %{
       "id" => Utils.generate_activity_id(),
       "actor" => actor.ap_id,
       "object" => object_id,
       "to" => to,
       "type" => "Delete"
     }, []}
  end

  def create(actor, object, recipients) do
    context =
      if is_map(object) do
        object["context"]
      else
        nil
      end

    {:ok,
     %{
       "id" => Utils.generate_activity_id(),
       "actor" => actor.ap_id,
       "to" => recipients,
       "object" => object,
       "type" => "Create",
       "published" => DateTime.utc_now() |> DateTime.to_iso8601()
     }
     |> Pleroma.Maps.put_if_present("context", context), []}
  end

  def chat_message(actor, recipient, content, opts \\ []) do
    basic = %{
      "id" => Utils.generate_object_id(),
      "actor" => actor.ap_id,
      "type" => "ChatMessage",
      "to" => [recipient],
      "content" => content,
      "published" => DateTime.utc_now() |> DateTime.to_iso8601(),
      "emoji" => Emoji.Formatter.get_emoji_map(content)
    }

    case opts[:attachment] do
      %Object{data: attachment_data} ->
        {
          :ok,
          Map.put(basic, "attachment", attachment_data),
          []
        }

      _ ->
        {:ok, basic, []}
    end
  end

  def answer(user, object, name) do
    {:ok,
     %{
       "type" => "Answer",
       "actor" => user.ap_id,
       "attributedTo" => user.ap_id,
       "cc" => [object.data["actor"]],
       "to" => [],
       "name" => name,
       "inReplyTo" => object.data["id"],
       "context" => object.data["context"],
       "published" => DateTime.utc_now() |> DateTime.to_iso8601(),
       "id" => Utils.generate_object_id()
     }, []}
  end

  @spec tombstone(String.t(), String.t()) :: {:ok, map(), keyword()}
  def tombstone(actor, id) do
    {:ok,
     %{
       "id" => id,
       "actor" => actor,
       "type" => "Tombstone"
     }, []}
  end

  @spec like(User.t(), Object.t()) :: {:ok, map(), keyword()}
  def like(actor, object) do
    with {:ok, data, meta} <- object_action(actor, object) do
      data =
        data
        |> Map.put("type", "Like")

      {:ok, data, meta}
    end
  end

  # Retricted to user updates for now, always public
  @spec update(User.t(), Object.t()) :: {:ok, map(), keyword()}
  def update(actor, object) do
    to = [Pleroma.Constants.as_public(), actor.follower_address]

    {:ok,
     %{
       "id" => Utils.generate_activity_id(),
       "type" => "Update",
       "actor" => actor.ap_id,
       "object" => object,
       "to" => to
     }, []}
  end

  @spec block(User.t(), User.t()) :: {:ok, map(), keyword()}
  def block(blocker, blocked) do
    {:ok,
     %{
       "id" => Utils.generate_activity_id(),
       "type" => "Block",
       "actor" => blocker.ap_id,
       "object" => blocked.ap_id,
       "to" => [blocked.ap_id]
     }, []}
  end

  @spec announce(User.t(), Object.t(), keyword()) :: {:ok, map(), keyword()}
  def announce(actor, object, options \\ []) do
    public? = Keyword.get(options, :public, false)

    to =
      cond do
        actor.ap_id == Relay.ap_id() ->
          [actor.follower_address]

        public? and Visibility.is_local_public?(object) ->
          [actor.follower_address, object.data["actor"], Pleroma.Constants.as_local_public()]

        public? ->
          [actor.follower_address, object.data["actor"], Pleroma.Constants.as_public()]

        true ->
          [actor.follower_address, object.data["actor"]]
      end

    {:ok,
     %{
       "id" => Utils.generate_activity_id(),
       "actor" => actor.ap_id,
       "object" => object.data["id"],
       "to" => to,
       "context" => object.data["context"],
       "type" => "Announce",
       "published" => Utils.make_date()
     }, []}
  end

  @spec object_action(User.t(), Object.t()) :: {:ok, map(), keyword()}
  defp object_action(actor, object) do
    object_actor = User.get_cached_by_ap_id(object.data["actor"])

    # Address the actor of the object, and our actor's follower collection if the post is public.
    to =
      if Visibility.is_public?(object) do
        [actor.follower_address, object.data["actor"]]
      else
        [object.data["actor"]]
      end

    # CC everyone who's been addressed in the object, except ourself and the object actor's
    # follower collection
    cc =
      (object.data["to"] ++ (object.data["cc"] || []))
      |> List.delete(actor.ap_id)
      |> List.delete(object_actor.follower_address)

    {:ok,
     %{
       "id" => Utils.generate_activity_id(),
       "actor" => actor.ap_id,
       "object" => object.data["id"],
       "to" => to,
       "cc" => cc,
       "context" => object.data["context"]
     }, []}
  end
end