transmogrifier.ex 32.5 KB
Newer Older
1
# Pleroma: A lightweight social networking server
kaniini's avatar
kaniini committed
2
# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
3
4
# SPDX-License-Identifier: AGPL-3.0-only

5
6
7
8
defmodule Pleroma.Web.ActivityPub.Transmogrifier do
  @moduledoc """
  A module to handle coding from internal to wire ActivityPub and back.
  """
Haelwenn's avatar
Haelwenn committed
9
10
  alias Pleroma.Activity
  alias Pleroma.Object
rinpatch's avatar
rinpatch committed
11
  alias Pleroma.Object.Containment
Haelwenn's avatar
Haelwenn committed
12
  alias Pleroma.Repo
13
  alias Pleroma.User
Haelwenn's avatar
Haelwenn committed
14
15
  alias Pleroma.Web.ActivityPub.ActivityPub
  alias Pleroma.Web.ActivityPub.Utils
lain's avatar
lain committed
16
  alias Pleroma.Web.ActivityPub.Visibility
17
  alias Pleroma.Web.Federator
18
  alias Pleroma.Workers.TransmogrifierWorker
19

lain's avatar
lain committed
20
21
  import Ecto.Query

22
  require Logger
23
  require Pleroma.Constants
24

25
26
27
  @doc """
  Modifies an incoming AP object (mastodon format) to our internal format.
  """
28
  def fix_object(object, options \\ []) do
29
    object
30
    |> strip_internal_fields
31
    |> fix_actor
32
    |> fix_url
33
    |> fix_attachments
lain's avatar
lain committed
34
    |> fix_context
35
    |> fix_in_reply_to(options)
lain's avatar
lain committed
36
    |> fix_emoji
37
    |> fix_tag
38
    |> fix_content_map
39
    |> fix_addressing
40
    |> fix_summary
41
    |> fix_type(options)
42
43
44
  end

  def fix_summary(%{"summary" => nil} = object) do
45
    Map.put(object, "summary", "")
46
47
48
49
50
51
52
  end

  def fix_summary(%{"summary" => _} = object) do
    # summary is present, nothing to do
    object
  end

53
  def fix_summary(object), do: Map.put(object, "summary", "")
54
55

  def fix_addressing_list(map, field) do
56
57
58
59
60
61
62
63
64
    cond do
      is_binary(map[field]) ->
        Map.put(map, field, [map[field]])

      is_nil(map[field]) ->
        Map.put(map, field, [])

      true ->
        map
65
66
67
    end
  end

68
69
70
71
72
  def fix_explicit_addressing(
        %{"to" => to, "cc" => cc} = object,
        explicit_mentions,
        follower_collection
      ) do
73
    explicit_to = Enum.filter(to, fn x -> x in explicit_mentions end)
74

75
    explicit_cc = Enum.filter(to, fn x -> x not in explicit_mentions end)
76
77
78

    final_cc =
      (cc ++ explicit_cc)
79
      |> Enum.reject(fn x -> String.ends_with?(x, "/followers") and x != follower_collection end)
80
81
82
83
84
85
86
      |> Enum.uniq()

    object
    |> Map.put("to", explicit_to)
    |> Map.put("cc", final_cc)
  end

87
  def fix_explicit_addressing(object, _explicit_mentions, _followers_collection), do: object
88

89
90
  # if directMessage flag is set to true, leave the addressing alone
  def fix_explicit_addressing(%{"directMessage" => true} = object), do: object
91

92
  def fix_explicit_addressing(object) do
93
    explicit_mentions = Utils.determine_explicit_mentions(object)
94

95
96
97
98
    %User{follower_address: follower_collection} =
      object
      |> Containment.get_actor()
      |> User.get_cached_by_ap_id()
99

100
101
102
103
104
105
    explicit_mentions =
      explicit_mentions ++
        [
          Pleroma.Constants.as_public(),
          follower_collection
        ]
106

107
    fix_explicit_addressing(object, explicit_mentions, follower_collection)
lain's avatar
lain committed
108
109
  end

110
111
112
113
114
115
116
  # if as:Public is addressed, then make sure the followers collection is also addressed
  # so that the activities will be delivered to local users.
  def fix_implicit_addressing(%{"to" => to, "cc" => cc} = object, followers_collection) do
    recipients = to ++ cc

    if followers_collection not in recipients do
      cond do
117
        Pleroma.Constants.as_public() in cc ->
118
119
120
          to = to ++ [followers_collection]
          Map.put(object, "to", to)

121
        Pleroma.Constants.as_public() in to ->
122
123
124
125
126
127
          cc = cc ++ [followers_collection]
          Map.put(object, "cc", cc)

        true ->
          object
      end
128
    else
129
      object
130
131
132
    end
  end

133
134
  def fix_implicit_addressing(object, _), do: object

135
  def fix_addressing(object) do
Alexander Strizhakov's avatar
Alexander Strizhakov committed
136
    {:ok, %User{} = user} = User.get_or_fetch_by_ap_id(object["actor"])
137
138
    followers_collection = User.ap_followers(user)

139
    object
140
141
142
143
    |> fix_addressing_list("to")
    |> fix_addressing_list("cc")
    |> fix_addressing_list("bto")
    |> fix_addressing_list("bcc")
144
    |> fix_explicit_addressing()
145
    |> fix_implicit_addressing(followers_collection)
lain's avatar
lain committed
146
147
  end

148
  def fix_actor(%{"attributedTo" => actor} = object) do
149
    Map.put(object, "actor", Containment.get_actor(%{"actor" => actor}))
150
151
  end

152
153
154
  def fix_in_reply_to(object, options \\ [])

  def fix_in_reply_to(%{"inReplyTo" => in_reply_to} = object, options)
155
      when not is_nil(in_reply_to) do
156
    in_reply_to_id = prepare_in_reply_to(in_reply_to)
157
    object = Map.put(object, "inReplyToAtomUri", in_reply_to_id)
lain's avatar
lain committed
158

159
    if Federator.allowed_incoming_reply_depth?(options[:depth]) do
160
161
162
163
164
165
166
167
      with {:ok, replied_object} <- get_obj_helper(in_reply_to_id, options),
           %Activity{} = _ <- Activity.get_create_by_object_ap_id(replied_object.data["id"]) do
        object
        |> Map.put("inReplyTo", replied_object.data["id"])
        |> Map.put("inReplyToAtomUri", object["inReplyToAtomUri"] || in_reply_to_id)
        |> Map.put("conversation", replied_object.data["context"] || object["conversation"])
        |> Map.put("context", replied_object.data["context"] || object["conversation"])
      else
168
        e ->
feld's avatar
feld committed
169
          Logger.error("Couldn't fetch #{inspect(in_reply_to_id)}, error: #{inspect(e)}")
170
171
172
173
          object
      end
    else
      object
lain's avatar
lain committed
174
175
    end
  end
lain's avatar
lain committed
176

177
  def fix_in_reply_to(object, _options), do: object
lain's avatar
lain committed
178

179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
  defp prepare_in_reply_to(in_reply_to) do
    cond do
      is_bitstring(in_reply_to) ->
        in_reply_to

      is_map(in_reply_to) && is_bitstring(in_reply_to["id"]) ->
        in_reply_to["id"]

      is_list(in_reply_to) && is_bitstring(Enum.at(in_reply_to, 0)) ->
        Enum.at(in_reply_to, 0)

      true ->
        ""
    end
  end

lain's avatar
lain committed
195
  def fix_context(object) do
Haelwenn's avatar
Haelwenn committed
196
197
    context = object["context"] || object["conversation"] || Utils.generate_context_id()

lain's avatar
lain committed
198
    object
Haelwenn's avatar
Haelwenn committed
199
200
    |> Map.put("context", context)
    |> Map.put("conversation", context)
lain's avatar
lain committed
201
202
  end

203
  def fix_attachments(%{"attachment" => attachment} = object) when is_list(attachment) do
lain's avatar
lain committed
204
    attachments =
205
      Enum.map(attachment, fn data ->
206
207
208
209
210
211
212
        media_type = data["mediaType"] || data["mimeType"]
        href = data["url"] || data["href"]
        url = [%{"type" => "Link", "mediaType" => media_type, "href" => href}]

        data
        |> Map.put("mediaType", media_type)
        |> Map.put("url", url)
lain's avatar
lain committed
213
      end)
lain's avatar
lain committed
214

215
    Map.put(object, "attachment", attachments)
216
217
  end

218
  def fix_attachments(%{"attachment" => attachment} = object) when is_map(attachment) do
Maksim's avatar
Maksim committed
219
220
221
    object
    |> Map.put("attachment", [attachment])
    |> fix_attachments()
222
223
  end

224
  def fix_attachments(object), do: object
225

226
  def fix_url(%{"url" => url} = object) when is_map(url) do
227
    Map.put(object, "url", url["href"])
228
229
  end

230
231
232
  def fix_url(%{"type" => "Video", "url" => url} = object) when is_list(url) do
    first_element = Enum.at(url, 0)

233
    link_element = Enum.find(url, fn x -> is_map(x) and x["mimeType"] == "text/html" end)
234
235
236
237
238
239
240
241

    object
    |> Map.put("attachment", [first_element])
    |> Map.put("url", link_element["href"])
  end

  def fix_url(%{"type" => object_type, "url" => url} = object)
      when object_type != "Video" and is_list(url) do
242
243
244
245
246
247
248
249
250
    first_element = Enum.at(url, 0)

    url_string =
      cond do
        is_bitstring(first_element) -> first_element
        is_map(first_element) -> first_element["href"] || ""
        true -> ""
      end

251
    Map.put(object, "url", url_string)
252
253
254
255
  end

  def fix_url(object), do: object

256
  def fix_emoji(%{"tag" => tags} = object) when is_list(tags) do
lain's avatar
lain committed
257
    emoji =
258
259
      tags
      |> Enum.filter(fn data -> data["type"] == "Emoji" and data["icon"] end)
lain's avatar
lain committed
260
      |> Enum.reduce(%{}, fn data, mapping ->
261
        name = String.trim(data["name"], ":")
lain's avatar
lain committed
262

263
        Map.put(mapping, name, data["icon"]["url"])
lain's avatar
lain committed
264
      end)
lain's avatar
lain committed
265
266
267
268

    # we merge mastodon and pleroma emoji into a single mapping, to allow for both wire formats
    emoji = Map.merge(object["emoji"] || %{}, emoji)

269
    Map.put(object, "emoji", emoji)
lain's avatar
lain committed
270
271
  end

272
273
274
275
  def fix_emoji(%{"tag" => %{"type" => "Emoji"} = tag} = object) do
    name = String.trim(tag["name"], ":")
    emoji = %{name => tag["icon"]["url"]}

276
    Map.put(object, "emoji", emoji)
277
278
  end

279
  def fix_emoji(object), do: object
280

281
  def fix_tag(%{"tag" => tag} = object) when is_list(tag) do
lain's avatar
lain committed
282
    tags =
283
      tag
lain's avatar
lain committed
284
285
      |> Enum.filter(fn data -> data["type"] == "Hashtag" and data["name"] end)
      |> Enum.map(fn data -> String.slice(data["name"], 1..-1) end)
286

287
    Map.put(object, "tag", tag ++ tags)
288
289
  end

290
291
  def fix_tag(%{"tag" => %{"type" => "Hashtag", "name" => hashtag} = tag} = object) do
    combined = [tag, String.slice(hashtag, 1..-1)]
292

293
    Map.put(object, "tag", combined)
294
295
  end

296
297
  def fix_tag(%{"tag" => %{} = tag} = object), do: Map.put(object, "tag", [tag])

298
  def fix_tag(object), do: object
299

300
301
302
303
304
  # content map usually only has one language so this will do for now.
  def fix_content_map(%{"contentMap" => content_map} = object) do
    content_groups = Map.to_list(content_map)
    {_, content} = Enum.at(content_groups, 0)

305
    Map.put(object, "content", content)
306
307
308
309
  end

  def fix_content_map(object), do: object

310
311
  def fix_type(object, options \\ [])

312
313
  def fix_type(%{"inReplyTo" => reply_id, "name" => _} = object, options)
      when is_binary(reply_id) do
314
315
    with true <- Federator.allowed_incoming_reply_depth?(options[:depth]),
         {:ok, %{data: %{"type" => "Question"} = _} = _} <- get_obj_helper(reply_id, options) do
316
317
      Map.put(object, "type", "Answer")
    else
318
      _ -> object
319
320
321
    end
  end

322
  def fix_type(object, _), do: object
323

Maksim's avatar
Maksim committed
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
  defp mastodon_follow_hack(%{"id" => id, "actor" => follower_id}, followed) do
    with true <- id =~ "follows",
         %User{local: true} = follower <- User.get_cached_by_ap_id(follower_id),
         %Activity{} = activity <- Utils.fetch_latest_follow(follower, followed) do
      {:ok, activity}
    else
      _ -> {:error, nil}
    end
  end

  defp mastodon_follow_hack(_, _), do: {:error, nil}

  defp get_follow_activity(follow_object, followed) do
    with object_id when not is_nil(object_id) <- Utils.get_ap_id(follow_object),
         {_, %Activity{} = activity} <- {:activity, Activity.get_by_ap_id(object_id)} do
      {:ok, activity}
    else
      # Can't find the activity. This might a Mastodon 2.3 "Accept"
      {:activity, nil} ->
        mastodon_follow_hack(follow_object, followed)

      _ ->
        {:error, nil}
    end
  end

350
351
352
353
354
355
356
357
358
359
360
  # Reduce the object list to find the reported user.
  defp get_reported(objects) do
    Enum.reduce_while(objects, nil, fn ap_id, _ ->
      with %User{} = user <- User.get_cached_by_ap_id(ap_id) do
        {:halt, user}
      else
        _ -> {:cont, nil}
      end
    end)
  end

361
362
  def handle_incoming(data, options \\ [])

363
364
  # Flag objects are placed ahead of the ID check because Mastodon 2.8 and earlier send them
  # with nil ID.
365
  def handle_incoming(%{"type" => "Flag", "object" => objects, "actor" => actor} = data, _options) do
366
367
368
369
    with context <- data["context"] || Utils.generate_context_id(),
         content <- data["content"] || "",
         %User{} = actor <- User.get_cached_by_ap_id(actor),
         # Reduce the object list to find the reported user.
370
         %User{} = account <- get_reported(objects),
371
372
         # Remove the reported user from the object list.
         statuses <- Enum.filter(objects, fn ap_id -> ap_id != account.ap_id end) do
373
      %{
374
375
376
377
378
        actor: actor,
        context: context,
        account: account,
        statuses: statuses,
        content: content,
379
        additional: %{"cc" => [account.ap_id]}
380
      }
381
      |> ActivityPub.flag()
382
383
384
    end
  end

385
  # disallow objects with bogus IDs
386
387
  def handle_incoming(%{"id" => nil}, _options), do: :error
  def handle_incoming(%{"id" => ""}, _options), do: :error
388
  # length of https:// = 8, should validate better, but good enough for now.
389
390
  def handle_incoming(%{"id" => id}, _options) when not (is_binary(id) and length(id) > 8),
    do: :error
391

392
393
394
  # TODO: validate those with a Ecto scheme
  # - tags
  # - emoji
395
396
397
398
  def handle_incoming(
        %{"type" => "Create", "object" => %{"type" => objtype} = object} = data,
        options
      )
399
      when objtype in ["Article", "Note", "Video", "Page", "Question", "Answer"] do
400
    actor = Containment.get_actor(data)
401
402
403
404

    data =
      Map.put(data, "actor", actor)
      |> fix_addressing
405

406
    with nil <- Activity.get_create_by_object_ap_id(object["id"]),
407
         {:ok, %User{} = user} <- User.get_or_fetch_by_ap_id(data["actor"]) do
408
409
      options = Keyword.put(options, :depth, (options[:depth] || 0) + 1)
      object = fix_object(data["object"], options)
410

411
412
413
414
      params = %{
        to: data["to"],
        object: object,
        actor: user,
lain's avatar
lain committed
415
        context: object["conversation"],
416
417
        local: false,
        published: data["published"],
lain's avatar
lain committed
418
419
420
        additional:
          Map.take(data, [
            "cc",
421
            "directMessage",
lain's avatar
lain committed
422
423
            "id"
          ])
424
425
426
427
      }

      ActivityPub.create(params)
    else
lain's avatar
lain committed
428
      %Activity{} = activity -> {:ok, activity}
429
430
431
432
      _e -> :error
    end
  end

433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
  def handle_incoming(
        %{"type" => "Listen", "object" => %{"type" => "Audio"} = object} = data,
        options
      ) do
    actor = Containment.get_actor(data)

    data =
      Map.put(data, "actor", actor)
      |> fix_addressing

    with {:ok, %User{} = user} <- User.get_or_fetch_by_ap_id(data["actor"]) do
      options = Keyword.put(options, :depth, (options[:depth] || 0) + 1)
      object = fix_object(object, options)

      params = %{
        to: data["to"],
        object: object,
        actor: user,
        context: nil,
        local: false,
        published: data["published"],
        additional: Map.take(data, ["cc", "id"])
      }

      ActivityPub.listen(params)
    else
      _e -> :error
    end
  end

lain's avatar
lain committed
463
  def handle_incoming(
464
465
        %{"type" => "Follow", "object" => followed, "actor" => follower, "id" => id} = data,
        _options
lain's avatar
lain committed
466
      ) do
467
468
469
470
    with %User{local: true} = followed <-
           User.get_cached_by_ap_id(Containment.get_actor(%{"actor" => followed})),
         {:ok, %User{} = follower} <-
           User.get_or_fetch_by_ap_id(Containment.get_actor(%{"actor" => follower})),
471
         {:ok, activity} <- ActivityPub.follow(follower, followed, id, false) do
472
      with deny_follow_blocked <- Pleroma.Config.get([:user, :deny_follow_blocked]),
473
           {_, false} <- {:user_blocked, User.blocks?(followed, follower) && deny_follow_blocked},
474
475
           {_, false} <- {:user_locked, User.locked?(followed)},
           {_, {:ok, follower}} <- {:follow, User.follow(follower, followed)},
476
477
           {_, {:ok, _}} <-
             {:follow_state_update, Utils.update_follow_state_for_all(activity, "accept")} do
kaniini's avatar
kaniini committed
478
479
        ActivityPub.accept(%{
          to: [follower.ap_id],
480
          actor: followed,
kaniini's avatar
kaniini committed
481
482
483
          object: data,
          local: true
        })
484
485
      else
        {:user_blocked, true} ->
486
          {:ok, _} = Utils.update_follow_state_for_all(activity, "reject")
487
488
489
490
491
492
493
494
495

          ActivityPub.reject(%{
            to: [follower.ap_id],
            actor: followed,
            object: data,
            local: true
          })

        {:follow, {:error, _}} ->
496
          {:ok, _} = Utils.update_follow_state_for_all(activity, "reject")
497
498
499
500
501
502
503
504
505
506

          ActivityPub.reject(%{
            to: [follower.ap_id],
            actor: followed,
            object: data,
            local: true
          })

        {:user_locked, true} ->
          :noop
507
      end
lain's avatar
lain committed
508

509
510
      {:ok, activity}
    else
511
512
      _e ->
        :error
513
514
515
    end
  end

516
  def handle_incoming(
517
        %{"type" => "Accept", "object" => follow_object, "actor" => _actor, "id" => id} = data,
518
        _options
519
      ) do
520
    with actor <- Containment.get_actor(data),
521
         {:ok, %User{} = followed} <- User.get_or_fetch_by_ap_id(actor),
522
         {:ok, follow_activity} <- get_follow_activity(follow_object, followed),
523
         {:ok, follow_activity} <- Utils.update_follow_state_for_all(follow_activity, "accept"),
524
         %User{local: true} = follower <- User.get_cached_by_ap_id(follow_activity.data["actor"]),
525
526
527
528
529
530
         {:ok, _follower} = User.follow(follower, followed) do
      ActivityPub.accept(%{
        to: follow_activity.data["to"],
        type: "Accept",
        actor: followed,
        object: follow_activity.data["id"],
531
532
        local: false,
        activity_id: id
533
      })
534
535
    else
      _e -> :error
536
537
538
539
    end
  end

  def handle_incoming(
540
        %{"type" => "Reject", "object" => follow_object, "actor" => _actor, "id" => id} = data,
541
        _options
542
      ) do
543
    with actor <- Containment.get_actor(data),
544
         {:ok, %User{} = followed} <- User.get_or_fetch_by_ap_id(actor),
545
         {:ok, follow_activity} <- get_follow_activity(follow_object, followed),
546
         {:ok, follow_activity} <- Utils.update_follow_state_for_all(follow_activity, "reject"),
547
         %User{local: true} = follower <- User.get_cached_by_ap_id(follow_activity.data["actor"]),
lain's avatar
lain committed
548
         {:ok, activity} <-
549
           ActivityPub.reject(%{
lain's avatar
lain committed
550
             to: follow_activity.data["to"],
551
             type: "Reject",
552
             actor: followed,
lain's avatar
lain committed
553
             object: follow_activity.data["id"],
554
555
             local: false,
             activity_id: id
lain's avatar
lain committed
556
           }) do
557
558
      User.unfollow(follower, followed)

559
      {:ok, activity}
560
561
    else
      _e -> :error
562
563
564
    end
  end

lain's avatar
lain committed
565
  def handle_incoming(
566
567
        %{"type" => "Like", "object" => object_id, "actor" => _actor, "id" => id} = data,
        _options
lain's avatar
lain committed
568
      ) do
569
    with actor <- Containment.get_actor(data),
570
         {:ok, %User{} = actor} <- User.get_or_fetch_by_ap_id(actor),
571
         {:ok, object} <- get_obj_helper(object_id),
feld's avatar
feld committed
572
         {:ok, activity, _object} <- ActivityPub.like(actor, object, id, false) do
lain's avatar
lain committed
573
574
575
576
577
578
      {:ok, activity}
    else
      _e -> :error
    end
  end

lain's avatar
lain committed
579
  def handle_incoming(
580
581
        %{"type" => "Announce", "object" => object_id, "actor" => _actor, "id" => id} = data,
        _options
lain's avatar
lain committed
582
      ) do
583
    with actor <- Containment.get_actor(data),
584
         {:ok, %User{} = actor} <- User.get_or_fetch_by_ap_id(actor),
585
         {:ok, object} <- get_embedded_obj_helper(object_id, actor),
lain's avatar
lain committed
586
         public <- Visibility.is_public?(data),
587
         {:ok, activity, _object} <- ActivityPub.announce(actor, object, id, false, public) do
lain's avatar
lain committed
588
589
590
591
592
593
      {:ok, activity}
    else
      _e -> :error
    end
  end

lain's avatar
lain committed
594
  def handle_incoming(
595
        %{"type" => "Update", "object" => %{"type" => object_type} = object, "actor" => actor_id} =
596
597
          data,
        _options
598
599
      )
      when object_type in ["Person", "Application", "Service", "Organization"] do
minibikini's avatar
minibikini committed
600
    with %User{ap_id: ^actor_id} = actor <- User.get_cached_by_ap_id(object["id"]) do
lain's avatar
lain committed
601
602
      {:ok, new_user_data} = ActivityPub.user_data_from_user_object(object)

rinpatch's avatar
rinpatch committed
603
604
      banner = new_user_data[:info][:banner]
      locked = new_user_data[:info][:locked] || false
605
606
607
608
609
610
      attachment = get_in(new_user_data, [:info, :source_data, "attachment"]) || []

      fields =
        attachment
        |> Enum.filter(fn %{"type" => t} -> t == "PropertyValue" end)
        |> Enum.map(fn fields -> Map.take(fields, ["name", "value"]) end)
lain's avatar
lain committed
611
612
613
614

      update_data =
        new_user_data
        |> Map.take([:name, :bio, :avatar])
615
        |> Map.put(:info, %{banner: banner, locked: locked, fields: fields})
lain's avatar
lain committed
616
617

      actor
618
      |> User.upgrade_changeset(update_data, true)
lain's avatar
lain committed
619
      |> User.update_and_set_cache()
lain's avatar
lain committed
620

lain's avatar
lain committed
621
622
623
624
625
      ActivityPub.update(%{
        local: false,
        to: data["to"] || [],
        cc: data["cc"] || [],
        object: object,
626
627
        actor: actor_id,
        activity_id: data["id"]
lain's avatar
lain committed
628
      })
lain's avatar
lain committed
629
630
631
632
633
634
635
    else
      e ->
        Logger.error(e)
        :error
    end
  end

636
637
638
639
640
  # TODO: We presently assume that any actor on the same origin domain as the object being
  # deleted has the rights to delete that object.  A better way to validate whether or not
  # the object should be deleted is to refetch the object URI, which should return either
  # an error or a tombstone.  This would allow us to verify that a deletion actually took
  # place.
lain's avatar
lain committed
641
  def handle_incoming(
642
        %{"type" => "Delete", "object" => object_id, "actor" => actor, "id" => id} = data,
643
        _options
lain's avatar
lain committed
644
      ) do
lain's avatar
lain committed
645
    object_id = Utils.get_ap_id(object_id)
lain's avatar
lain committed
646

647
    with actor <- Containment.get_actor(data),
648
         {:ok, %User{} = actor} <- User.get_or_fetch_by_ap_id(actor),
649
         {:ok, object} <- get_obj_helper(object_id),
650
         :ok <- Containment.contain_origin(actor.ap_id, object.data),
651
652
         {:ok, activity} <-
           ActivityPub.delete(object, local: false, activity_id: id, actor: actor.ap_id) do
lain's avatar
lain committed
653
654
      {:ok, activity}
    else
655
656
657
      nil ->
        case User.get_cached_by_ap_id(object_id) do
          %User{ap_id: ^actor} = user ->
658
            User.delete(user)
659
660
661
662
663
664
665

          nil ->
            :error
        end

      _e ->
        :error
lain's avatar
lain committed
666
667
668
    end
  end

669
  def handle_incoming(
670
671
        %{
          "type" => "Undo",
672
          "object" => %{"type" => "Announce", "object" => object_id},
Maksim's avatar
Maksim committed
673
          "actor" => _actor,
674
          "id" => id
675
676
        } = data,
        _options
677
      ) do
678
    with actor <- Containment.get_actor(data),
679
         {:ok, %User{} = actor} <- User.get_or_fetch_by_ap_id(actor),
680
         {:ok, object} <- get_obj_helper(object_id),
681
         {:ok, activity, _} <- ActivityPub.unannounce(actor, object, id, false) do
682
683
      {:ok, activity}
    else
Thog's avatar
Thog committed
684
      _e -> :error
685
686
687
    end
  end

normandy's avatar
normandy committed
688
689
690
691
692
693
  def handle_incoming(
        %{
          "type" => "Undo",
          "object" => %{"type" => "Follow", "object" => followed},
          "actor" => follower,
          "id" => id
694
695
        } = _data,
        _options
normandy's avatar
normandy committed
696
      ) do
normandy's avatar
normandy committed
697
    with %User{local: true} = followed <- User.get_cached_by_ap_id(followed),
698
         {:ok, %User{} = follower} <- User.get_or_fetch_by_ap_id(follower),
normandy's avatar
normandy committed
699
         {:ok, activity} <- ActivityPub.unfollow(follower, followed, id, false) do
normandy's avatar
normandy committed
700
701
702
      User.unfollow(follower, followed)
      {:ok, activity}
    else
Maksim's avatar
Maksim committed
703
      _e -> :error
normandy's avatar
normandy committed
704
705
706
    end
  end

normandy's avatar
normandy committed
707
708
709
710
711
712
  def handle_incoming(
        %{
          "type" => "Undo",
          "object" => %{"type" => "Block", "object" => blocked},
          "actor" => blocker,
          "id" => id
713
714
        } = _data,
        _options
normandy's avatar
normandy committed
715
      ) do
716
    with %User{local: true} = blocked <- User.get_cached_by_ap_id(blocked),
717
         {:ok, %User{} = blocker} <- User.get_or_fetch_by_ap_id(blocker),
normandy's avatar
normandy committed
718
         {:ok, activity} <- ActivityPub.unblock(blocker, blocked, id, false) do
normandy's avatar
normandy committed
719
      User.unblock(blocker, blocked)
normandy's avatar
normandy committed
720
721
      {:ok, activity}
    else
Maksim's avatar
Maksim committed
722
      _e -> :error
normandy's avatar
normandy committed
723
724
725
    end
  end

726
  def handle_incoming(
727
728
        %{"type" => "Block", "object" => blocked, "actor" => blocker, "id" => id} = _data,
        _options
729
      ) do
730
    with %User{local: true} = blocked = User.get_cached_by_ap_id(blocked),
0x1C3B00DA's avatar
0x1C3B00DA committed
731
         {:ok, %User{} = blocker} = User.get_or_fetch_by_ap_id(blocker),
normandy's avatar
normandy committed
732
         {:ok, activity} <- ActivityPub.block(blocker, blocked, id, false) do
733
      User.unfollow(blocker, blocked)
734
      User.block(blocker, blocked)
normandy's avatar
normandy committed
735
736
      {:ok, activity}
    else
Maksim's avatar
Maksim committed
737
      _e -> :error
normandy's avatar
normandy committed
738
739
    end
  end
740

Thog's avatar
Thog committed
741
742
743
744
  def handle_incoming(
        %{
          "type" => "Undo",
          "object" => %{"type" => "Like", "object" => object_id},
Maksim's avatar
Maksim committed
745
          "actor" => _actor,
Thog's avatar
Thog committed
746
          "id" => id
747
748
        } = data,
        _options
Thog's avatar
Thog committed
749
      ) do
750
    with actor <- Containment.get_actor(data),
751
         {:ok, %User{} = actor} <- User.get_or_fetch_by_ap_id(actor),
752
         {:ok, object} <- get_obj_helper(object_id),
Thog's avatar
Thog committed
753
754
755
         {:ok, activity, _, _} <- ActivityPub.unlike(actor, object, id, false) do
      {:ok, activity}
    else
Thog's avatar
Thog committed
756
      _e -> :error
Thog's avatar
Thog committed
757
758
759
    end
  end

760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
  # For Undos that don't have the complete object attached, try to find it in our database.
  def handle_incoming(
        %{
          "type" => "Undo",
          "object" => object
        } = activity,
        options
      )
      when is_binary(object) do
    with %Activity{data: data} <- Activity.get_by_ap_id(object) do
      activity
      |> Map.put("object", data)
      |> handle_incoming(options)
    else
      _e -> :error
    end
  end

778
  def handle_incoming(_, _), do: :error
779

780
  @spec get_obj_helper(String.t(), Keyword.t()) :: {:ok, Object.t()} | nil
781
  def get_obj_helper(id, options \\ []) do
Maksim's avatar
Maksim committed
782
783
784
    case Object.normalize(id, true, options) do
      %Object{} = object -> {:ok, object}
      _ -> nil
785
    end
786
787
  end

788
  @spec get_embedded_obj_helper(String.t() | Object.t(), User.t()) :: {:ok, Object.t()} | nil
Thibaut Girka's avatar
Thibaut Girka committed
789
  def get_embedded_obj_helper(%{"attributedTo" => attributed_to, "id" => object_id} = data, %User{
790
791
        ap_id: ap_id
      })
Thibaut Girka's avatar
Thibaut Girka committed
792
      when attributed_to == ap_id do
793
794
795
796
797
    with {:ok, activity} <-
           handle_incoming(%{
             "type" => "Create",
             "to" => data["to"],
             "cc" => data["cc"],
Thibaut Girka's avatar
Thibaut Girka committed
798
             "actor" => attributed_to,
799
800
801
802
803
804
805
806
807
808
809
810
             "object" => data
           }) do
      {:ok, Object.normalize(activity)}
    else
      _ -> get_obj_helper(object_id)
    end
  end

  def get_embedded_obj_helper(object_id, _) do
    get_obj_helper(object_id)
  end

811
812
813
814
  def set_reply_to_uri(%{"inReplyTo" => in_reply_to} = object) when is_binary(in_reply_to) do
    with false <- String.starts_with?(in_reply_to, "http"),
         {:ok, %{data: replied_to_object}} <- get_obj_helper(in_reply_to) do
      Map.put(object, "inReplyTo", replied_to_object["external_url"] || in_reply_to)
815
816
817
818
    else
      _e -> object
    end
  end
lain's avatar
lain committed
819

820
821
822
  def set_reply_to_uri(obj), do: obj

  # Prepares the object of an outgoing create activity.
lain's avatar
lain committed
823
824
  def prepare_object(object) do
    object
lain's avatar
lain committed
825
    |> set_sensitive
lain's avatar
lain committed
826
    |> add_hashtags
lain's avatar
lain committed
827
    |> add_mention_tags
lain's avatar
lain committed
828
    |> add_emoji_tags
lain's avatar
lain committed
829
    |> add_attributed_to
lain's avatar
lain committed
830
    |> prepare_attachments
lain's avatar
lain committed
831
    |> set_conversation
832
    |> set_reply_to_uri
833
834
    |> strip_internal_fields
    |> strip_internal_tags
835
    |> set_type
lain's avatar
lain committed
836
837
  end

feld's avatar
feld committed
838
839
840
841
  #  @doc
  #  """
  #  internal -> Mastodon
  #  """
lain's avatar
lain committed
842

843
844
  def prepare_outgoing(%{"type" => activity_type, "object" => object_id} = data)
      when activity_type in ["Create", "Listen"] do
lain's avatar
lain committed
845
    object =
minibikini's avatar
minibikini committed
846
847
848
      object_id
      |> Object.normalize()
      |> Map.get(:data)
lain's avatar
lain committed
849
850
851
852
853
      |> prepare_object

    data =
      data
      |> Map.put("object", object)
lain's avatar
lain committed
854
      |> Map.merge(Utils.make_json_ld_header())
minibikini's avatar
minibikini committed
855
      |> Map.delete("bcc")
lain's avatar
lain committed
856
857
858
859

    {:ok, data}
  end

860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
  def prepare_outgoing(%{"type" => "Announce", "actor" => ap_id, "object" => object_id} = data) do
    object =
      object_id
      |> Object.normalize()

    data =
      if Visibility.is_private?(object) && object.data["actor"] == ap_id do
        data |> Map.put("object", object |> Map.get(:data) |> prepare_object)
      else
        data |> maybe_fix_object_url
      end

    data =
      data
      |> strip_internal_fields
      |> Map.merge(Utils.make_json_ld_header())
      |> Map.delete("bcc")

    {:ok, data}
  end

kaniini's avatar
kaniini committed
881
882
883
  # Mastodon Accept/Reject requires a non-normalized object containing the actor URIs,
  # because of course it does.
  def prepare_outgoing(%{"type" => "Accept"} = data) do
884
    with follow_activity <- Activity.normalize(data["object"]) do
kaniini's avatar
kaniini committed
885
886
887
888
889
890
891
892
893
894
      object = %{
        "actor" => follow_activity.actor,
        "object" => follow_activity.data["object"],
        "id" => follow_activity.data["id"],
        "type" => "Follow"
      }

      data =
        data
        |> Map.put("object", object)
lain's avatar
lain committed
895
        |> Map.merge(Utils.make_json_ld_header())
kaniini's avatar
kaniini committed
896
897
898
899
900

      {:ok, data}
    end
  end

901
  def prepare_outgoing(%{"type" => "Reject"} = data) do
902
    with follow_activity <- Activity.normalize(data["object"]) do
903
904
905
906
907
908
909
910
911
912
      object = %{
        "actor" => follow_activity.actor,
        "object" => follow_activity.data["object"],
        "id" => follow_activity.data["id"],
        "type" => "Follow"
      }

      data =
        data
        |> Map.put("object", object)
lain's avatar
lain committed
913
        |> Map.merge(Utils.make_json_ld_header())
914
915
916
917
918

      {:ok, data}
    end
  end

feld's avatar
feld committed
919
  def prepare_outgoing(%{"type" => _type} = data) do
lain's avatar
lain committed
920
921
    data =
      data
922
      |> strip_internal_fields
lain's avatar
lain committed
923
      |> maybe_fix_object_url
lain's avatar
lain committed
924
      |> Map.merge(Utils.make_json_ld_header())
925
926
927
928

    {:ok, data}
  end

929
930
931
932
933
934
  def maybe_fix_object_url(%{"object" => object} = data) when is_binary(object) do
    with false <- String.starts_with?(object, "http"),
         {:fetch, {:ok, relative_object}} <- {:fetch, get_obj_helper(object)},
         %{data: %{"external_url" => external_url}} when not is_nil(external_url) <-
           relative_object do
      Map.put(data, "object", external_url)
935
    else
936
937
938
939
940
941
      {:fetch, e} ->
        Logger.error("Couldn't fetch #{object} #{inspect(e)}")
        data

      _ ->
        data
942
943
944
    end
  end

945
946
  def maybe_fix_object_url(data), do: data

lain's avatar
lain committed
947