transmogrifier.ex 28 KB
Newer Older
1
# Pleroma: A lightweight social networking server
2
# Copyright © 2017-2020 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
  alias Pleroma.Activity
10
  alias Pleroma.EctoType.ActivityPub.ObjectValidators
11
  alias Pleroma.Maps
Haelwenn's avatar
Haelwenn committed
12
  alias Pleroma.Object
rinpatch's avatar
rinpatch committed
13
  alias Pleroma.Object.Containment
Haelwenn's avatar
Haelwenn committed
14
  alias Pleroma.Repo
15
  alias Pleroma.User
Haelwenn's avatar
Haelwenn committed
16
  alias Pleroma.Web.ActivityPub.ActivityPub
17
  alias Pleroma.Web.ActivityPub.Builder
18
19
  alias Pleroma.Web.ActivityPub.ObjectValidator
  alias Pleroma.Web.ActivityPub.Pipeline
Haelwenn's avatar
Haelwenn committed
20
  alias Pleroma.Web.ActivityPub.Utils
lain's avatar
lain committed
21
  alias Pleroma.Web.ActivityPub.Visibility
22
  alias Pleroma.Web.Federator
23
  alias Pleroma.Workers.TransmogrifierWorker
24

lain's avatar
lain committed
25
26
  import Ecto.Query

27
  require Logger
28
  require Pleroma.Constants
29

30
31
32
  @doc """
  Modifies an incoming AP object (mastodon format) to our internal format.
  """
33
  def fix_object(object, options \\ []) do
34
    object
35
    |> strip_internal_fields
36
    |> fix_actor
37
    |> fix_url
38
    |> fix_attachments
lain's avatar
lain committed
39
    |> fix_context
40
    |> fix_in_reply_to(options)
lain's avatar
lain committed
41
    |> fix_emoji
42
    |> fix_tag
43
    |> set_sensitive
44
    |> fix_content_map
45
    |> fix_addressing
46
    |> fix_summary
47
    |> fix_type(options)
48
49
50
  end

  def fix_summary(%{"summary" => nil} = object) do
51
    Map.put(object, "summary", "")
52
53
54
55
56
57
58
  end

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

59
  def fix_summary(object), do: Map.put(object, "summary", "")
60
61

  def fix_addressing_list(map, field) do
62
63
    addrs = map[field]

64
    cond do
65
66
      is_list(addrs) ->
        Map.put(map, field, Enum.filter(addrs, &is_binary/1))
67

68
69
      is_binary(addrs) ->
        Map.put(map, field, [addrs])
70
71

      true ->
72
        Map.put(map, field, [])
73
74
75
    end
  end

76
77
78
79
80
  def fix_explicit_addressing(
        %{"to" => to, "cc" => cc} = object,
        explicit_mentions,
        follower_collection
      ) do
81
    explicit_to = Enum.filter(to, fn x -> x in explicit_mentions end)
82

83
    explicit_cc = Enum.filter(to, fn x -> x not in explicit_mentions end)
84
85
86

    final_cc =
      (cc ++ explicit_cc)
87
      |> Enum.reject(fn x -> String.ends_with?(x, "/followers") and x != follower_collection end)
88
89
90
91
92
93
94
      |> Enum.uniq()

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

95
  def fix_explicit_addressing(object, _explicit_mentions, _followers_collection), do: object
96

97
98
  # if directMessage flag is set to true, leave the addressing alone
  def fix_explicit_addressing(%{"directMessage" => true} = object), do: object
99

100
  def fix_explicit_addressing(object) do
101
    explicit_mentions = Utils.determine_explicit_mentions(object)
102

103
104
105
106
    %User{follower_address: follower_collection} =
      object
      |> Containment.get_actor()
      |> User.get_cached_by_ap_id()
107

108
109
110
111
112
113
    explicit_mentions =
      explicit_mentions ++
        [
          Pleroma.Constants.as_public(),
          follower_collection
        ]
114

115
    fix_explicit_addressing(object, explicit_mentions, follower_collection)
lain's avatar
lain committed
116
117
  end

118
119
120
121
122
123
124
  # 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
125
        Pleroma.Constants.as_public() in cc ->
126
127
128
          to = to ++ [followers_collection]
          Map.put(object, "to", to)

129
        Pleroma.Constants.as_public() in to ->
130
131
132
133
134
135
          cc = cc ++ [followers_collection]
          Map.put(object, "cc", cc)

        true ->
          object
      end
136
    else
137
      object
138
139
140
    end
  end

141
142
  def fix_implicit_addressing(object, _), do: object

143
  def fix_addressing(object) do
Alexander Strizhakov's avatar
Alexander Strizhakov committed
144
    {:ok, %User{} = user} = User.get_or_fetch_by_ap_id(object["actor"])
145
146
    followers_collection = User.ap_followers(user)

147
    object
148
149
150
151
    |> fix_addressing_list("to")
    |> fix_addressing_list("cc")
    |> fix_addressing_list("bto")
    |> fix_addressing_list("bcc")
152
    |> fix_explicit_addressing()
153
    |> fix_implicit_addressing(followers_collection)
lain's avatar
lain committed
154
155
  end

156
  def fix_actor(%{"attributedTo" => actor} = object) do
157
158
159
160
161
162
    actor = Containment.get_actor(%{"actor" => actor})

    # TODO: Remove actor field for Objects
    object
    |> Map.put("actor", actor)
    |> Map.put("attributedTo", actor)
163
164
  end

165
166
167
  def fix_in_reply_to(object, options \\ [])

  def fix_in_reply_to(%{"inReplyTo" => in_reply_to} = object, options)
168
      when not is_nil(in_reply_to) do
169
    in_reply_to_id = prepare_in_reply_to(in_reply_to)
170
    depth = (options[:depth] || 0) + 1
lain's avatar
lain committed
171

172
    if Federator.allowed_thread_distance?(depth) do
173
      with {:ok, replied_object} <- get_obj_helper(in_reply_to_id, options),
minibikini's avatar
minibikini committed
174
           %Activity{} <- Activity.get_create_by_object_ap_id(replied_object.data["id"]) do
175
176
177
        object
        |> Map.put("inReplyTo", replied_object.data["id"])
        |> Map.put("context", replied_object.data["context"] || object["conversation"])
178
        |> Map.drop(["conversation", "inReplyToAtomUri"])
179
      else
180
        e ->
181
          Logger.warn("Couldn't fetch #{inspect(in_reply_to_id)}, error: #{inspect(e)}")
182
183
184
185
          object
      end
    else
      object
lain's avatar
lain committed
186
187
    end
  end
lain's avatar
lain committed
188

189
  def fix_in_reply_to(object, _options), do: object
lain's avatar
lain committed
190

191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
  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
207
  def fix_context(object) do
Haelwenn's avatar
Haelwenn committed
208
209
    context = object["context"] || object["conversation"] || Utils.generate_context_id()

lain's avatar
lain committed
210
    object
Haelwenn's avatar
Haelwenn committed
211
    |> Map.put("context", context)
212
    |> Map.drop(["conversation"])
lain's avatar
lain committed
213
214
  end

215
  def fix_attachments(%{"attachment" => attachment} = object) when is_list(attachment) do
lain's avatar
lain committed
216
    attachments =
217
      Enum.map(attachment, fn data ->
218
219
220
221
222
223
224
225
226
        url =
          cond do
            is_list(data["url"]) -> List.first(data["url"])
            is_map(data["url"]) -> data["url"]
            true -> nil
          end

        media_type =
          cond do
227
228
229
            is_map(url) && MIME.valid?(url["mediaType"]) -> url["mediaType"]
            MIME.valid?(data["mediaType"]) -> data["mediaType"]
            MIME.valid?(data["mimeType"]) -> data["mimeType"]
230
231
232
233
234
235
236
237
            true -> nil
          end

        href =
          cond do
            is_map(url) && is_binary(url["href"]) -> url["href"]
            is_binary(data["url"]) -> data["url"]
            is_binary(data["href"]) -> data["href"]
Haelwenn's avatar
Haelwenn committed
238
            true -> nil
239
240
          end

Haelwenn's avatar
Haelwenn committed
241
242
        if href do
          attachment_url =
Haelwenn's avatar
Haelwenn committed
243
244
245
246
            %{
              "href" => href,
              "type" => Map.get(url || %{}, "type", "Link")
            }
Haelwenn's avatar
Haelwenn committed
247
            |> Maps.put_if_present("mediaType", media_type)
248

Haelwenn's avatar
Haelwenn committed
249
250
251
252
          %{
            "url" => [attachment_url],
            "type" => data["type"] || "Document"
          }
Haelwenn's avatar
Haelwenn committed
253
254
          |> Maps.put_if_present("mediaType", media_type)
          |> Maps.put_if_present("name", data["name"])
255
          |> Maps.put_if_present("blurhash", data["blurhash"])
Haelwenn's avatar
Haelwenn committed
256
257
258
        else
          nil
        end
lain's avatar
lain committed
259
      end)
Haelwenn's avatar
Haelwenn committed
260
      |> Enum.filter(& &1)
lain's avatar
lain committed
261

262
    Map.put(object, "attachment", attachments)
263
264
  end

265
  def fix_attachments(%{"attachment" => attachment} = object) when is_map(attachment) do
Maksim's avatar
Maksim committed
266
267
268
    object
    |> Map.put("attachment", [attachment])
    |> fix_attachments()
269
270
  end

271
  def fix_attachments(object), do: object
272

273
  def fix_url(%{"url" => url} = object) when is_map(url) do
274
    Map.put(object, "url", url["href"])
275
276
  end

Haelwenn's avatar
Haelwenn committed
277
  def fix_url(%{"url" => url} = object) when is_list(url) do
278
279
280
281
282
283
284
285
286
    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

287
    Map.put(object, "url", url_string)
288
289
290
291
  end

  def fix_url(object), do: object

292
  def fix_emoji(%{"tag" => tags} = object) when is_list(tags) do
lain's avatar
lain committed
293
    emoji =
294
      tags
295
      |> Enum.filter(fn data -> is_map(data) and data["type"] == "Emoji" and data["icon"] end)
lain's avatar
lain committed
296
      |> Enum.reduce(%{}, fn data, mapping ->
297
        name = String.trim(data["name"], ":")
lain's avatar
lain committed
298

299
        Map.put(mapping, name, data["icon"]["url"])
lain's avatar
lain committed
300
      end)
lain's avatar
lain committed
301

302
    Map.put(object, "emoji", emoji)
lain's avatar
lain committed
303
304
  end

305
306
307
308
  def fix_emoji(%{"tag" => %{"type" => "Emoji"} = tag} = object) do
    name = String.trim(tag["name"], ":")
    emoji = %{name => tag["icon"]["url"]}

309
    Map.put(object, "emoji", emoji)
310
311
  end

312
  def fix_emoji(object), do: object
313

314
  def fix_tag(%{"tag" => tag} = object) when is_list(tag) do
lain's avatar
lain committed
315
    tags =
316
      tag
lain's avatar
lain committed
317
      |> Enum.filter(fn data -> data["type"] == "Hashtag" and data["name"] end)
318
319
320
321
322
      |> Enum.map(fn %{"name" => name} ->
        name
        |> String.slice(1..-1)
        |> String.downcase()
      end)
323

324
    Map.put(object, "tag", tag ++ tags)
325
326
  end

327
328
329
330
  def fix_tag(%{"tag" => %{} = tag} = object) do
    object
    |> Map.put("tag", [tag])
    |> fix_tag
331
332
  end

333
  def fix_tag(object), do: object
334

335
336
337
338
339
  # 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)

340
    Map.put(object, "content", content)
341
342
343
344
  end

  def fix_content_map(object), do: object

345
346
  def fix_type(object, options \\ [])

347
348
  def fix_type(%{"inReplyTo" => reply_id, "name" => _} = object, options)
      when is_binary(reply_id) do
349
    with true <- Federator.allowed_thread_distance?(options[:depth]),
350
         {:ok, %{data: %{"type" => "Question"} = _} = _} <- get_obj_helper(reply_id, options) do
351
352
      Map.put(object, "type", "Answer")
    else
353
      _ -> object
354
355
356
    end
  end

357
  def fix_type(object, _), do: object
358

359
360
361
362
363
364
365
366
367
368
369
  # 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

370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
  # Compatibility wrapper for Mastodon votes
  defp handle_create(%{"object" => %{"type" => "Answer"}} = data, _user) do
    handle_incoming(data)
  end

  defp handle_create(%{"object" => object} = data, user) do
    %{
      to: data["to"],
      object: object,
      actor: user,
      context: object["context"],
      local: false,
      published: data["published"],
      additional:
        Map.take(data, [
          "cc",
          "directMessage",
          "id"
        ])
    }
    |> ActivityPub.create()
  end

393
394
  def handle_incoming(data, options \\ [])

395
396
  # Flag objects are placed ahead of the ID check because Mastodon 2.8 and earlier send them
  # with nil ID.
397
  def handle_incoming(%{"type" => "Flag", "object" => objects, "actor" => actor} = data, _options) do
398
399
400
401
    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.
402
         %User{} = account <- get_reported(objects),
403
404
         # Remove the reported user from the object list.
         statuses <- Enum.filter(objects, fn ap_id -> ap_id != account.ap_id end) do
405
      %{
406
407
408
409
410
        actor: actor,
        context: context,
        account: account,
        statuses: statuses,
        content: content,
411
        additional: %{"cc" => [account.ap_id]}
412
      }
413
      |> ActivityPub.flag()
414
415
416
    end
  end

417
  # disallow objects with bogus IDs
418
419
  def handle_incoming(%{"id" => nil}, _options), do: :error
  def handle_incoming(%{"id" => ""}, _options), do: :error
420
  # length of https:// = 8, should validate better, but good enough for now.
rinpatch's avatar
rinpatch committed
421
  def handle_incoming(%{"id" => id}, _options) when is_binary(id) and byte_size(id) < 8,
422
    do: :error
423

424
425
426
  # TODO: validate those with a Ecto scheme
  # - tags
  # - emoji
427
428
429
430
  def handle_incoming(
        %{"type" => "Create", "object" => %{"type" => objtype} = object} = data,
        options
      )
Haelwenn's avatar
Haelwenn committed
431
      when objtype in ~w{Note Page} do
432
    actor = Containment.get_actor(data)
433

434
    with nil <- Activity.get_create_by_object_ap_id(object["id"]),
435
436
437
438
439
440
441
442
         {:ok, %User{} = user} <- User.get_or_fetch_by_ap_id(actor) do
      data =
        data
        |> Map.put("object", fix_object(object, options))
        |> Map.put("actor", actor)
        |> fix_addressing()

      with {:ok, created_activity} <- handle_create(data, user) do
443
444
445
446
447
448
449
450
451
        reply_depth = (options[:depth] || 0) + 1

        if Federator.allowed_thread_distance?(reply_depth) do
          for reply_id <- replies(object) do
            Pleroma.Workers.RemoteFetcherWorker.enqueue("fetch_remote", %{
              "id" => reply_id,
              "depth" => reply_depth
            })
          end
452
453
454
455
        end

        {:ok, created_activity}
      end
456
    else
lain's avatar
lain committed
457
      %Activity{} = activity -> {:ok, activity}
458
459
460
461
      _e -> :error
    end
  end

462
463
464
465
466
467
468
469
470
471
472
  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
473
474
      reply_depth = (options[:depth] || 0) + 1
      options = Keyword.put(options, :depth, reply_depth)
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
      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

493
494
495
496
497
498
499
500
501
502
  @misskey_reactions %{
    "like" => "👍",
    "love" => "❤️",
    "laugh" => "😆",
    "hmm" => "🤔",
    "surprise" => "😮",
    "congrats" => "🎉",
    "angry" => "💢",
    "confused" => "😥",
    "rip" => "😇",
503
504
    "pudding" => "🍮",
    "star" => "⭐"
505
506
  }

lain's avatar
lain committed
507
  @doc "Rewrite misskey likes into EmojiReacts"
508
509
510
511
512
513
514
515
  def handle_incoming(
        %{
          "type" => "Like",
          "_misskey_reaction" => reaction
        } = data,
        options
      ) do
    data
lain's avatar
lain committed
516
    |> Map.put("type", "EmojiReact")
517
    |> Map.put("content", @misskey_reactions[reaction] || reaction)
518
519
520
    |> handle_incoming(options)
  end

Haelwenn's avatar
Haelwenn committed
521
  def handle_incoming(
522
        %{"type" => "Create", "object" => %{"type" => objtype, "id" => obj_id}} = data,
Haelwenn's avatar
Haelwenn committed
523
        _options
Haelwenn's avatar
Haelwenn committed
524
      )
Haelwenn's avatar
Haelwenn committed
525
      when objtype in ~w{Question Answer ChatMessage Audio Video Event Article} do
526
527
    data = Map.put(data, "object", strip_internal_fields(data["object"]))

Haelwenn's avatar
Haelwenn committed
528
    with {:ok, %User{}} <- ObjectValidator.fetch_actor(data),
529
         nil <- Activity.get_create_by_object_ap_id(obj_id),
Haelwenn's avatar
Haelwenn committed
530
531
         {:ok, activity, _} <- Pipeline.common_pipeline(data, local: false) do
      {:ok, activity}
532
533
534
    else
      %Activity{} = activity -> {:ok, activity}
      e -> e
Haelwenn's avatar
Haelwenn committed
535
536
537
    end
  end

538
  def handle_incoming(%{"type" => type} = data, _options)
539
      when type in ~w{Like EmojiReact Announce} do
lain's avatar
lain committed
540
541
542
    with :ok <- ObjectValidator.fetch_actor_and_object(data),
         {:ok, activity, _meta} <-
           Pipeline.common_pipeline(data, local: false) do
lain's avatar
lain committed
543
544
      {:ok, activity}
    else
545
      e -> {:error, e}
lain's avatar
lain committed
546
547
548
    end
  end

lain's avatar
lain committed
549
  def handle_incoming(
550
        %{"type" => type} = data,
551
        _options
552
      )
553
      when type in ~w{Update Block Follow Accept Reject} do
554
    with {:ok, %User{}} <- ObjectValidator.fetch_actor(data),
555
556
         {:ok, activity, _} <-
           Pipeline.common_pipeline(data, local: false) do
557
      {:ok, activity}
lain's avatar
lain committed
558
559
560
    end
  end

lain's avatar
lain committed
561
  def handle_incoming(
562
        %{"type" => "Delete"} = data,
563
        _options
lain's avatar
lain committed
564
      ) do
565
566
    with {:ok, activity, _} <-
           Pipeline.common_pipeline(data, local: false) do
lain's avatar
lain committed
567
      {:ok, activity}
568
569
570
    else
      {:error, {:validate_object, _}} = e ->
        # Check if we have a create activity for this
571
        with {:ok, object_id} <- ObjectValidators.ObjectID.cast(data["object"]),
572
573
574
575
576
577
578
579
580
             %Activity{data: %{"actor" => actor}} <-
               Activity.create_by_object_ap_id(object_id) |> Repo.one(),
             # We have one, insert a tombstone and retry
             {:ok, tombstone_data, _} <- Builder.tombstone(actor, object_id),
             {:ok, _tombstone} <- Object.create(tombstone_data) do
          handle_incoming(data)
        else
          _ -> e
        end
lain's avatar
lain committed
581
582
583
    end
  end

normandy's avatar
normandy committed
584
585
586
587
588
589
  def handle_incoming(
        %{
          "type" => "Undo",
          "object" => %{"type" => "Follow", "object" => followed},
          "actor" => follower,
          "id" => id
590
591
        } = _data,
        _options
normandy's avatar
normandy committed
592
      ) do
normandy's avatar
normandy committed
593
    with %User{local: true} = followed <- User.get_cached_by_ap_id(followed),
594
         {:ok, %User{} = follower} <- User.get_or_fetch_by_ap_id(follower),
normandy's avatar
normandy committed
595
         {:ok, activity} <- ActivityPub.unfollow(follower, followed, id, false) do
normandy's avatar
normandy committed
596
597
598
      User.unfollow(follower, followed)
      {:ok, activity}
    else
Maksim's avatar
Maksim committed
599
      _e -> :error
normandy's avatar
normandy committed
600
601
602
    end
  end

603
604
605
  def handle_incoming(
        %{
          "type" => "Undo",
606
          "object" => %{"type" => type}
607
608
        } = data,
        _options
609
      )
610
      when type in ["Like", "EmojiReact", "Announce", "Block"] do
611
    with {:ok, activity, _} <- Pipeline.common_pipeline(data, local: false) do
612
613
614
615
      {:ok, activity}
    end
  end

616
  # For Undos that don't have the complete object attached, try to find it in our database.
normandy's avatar
normandy committed
617
618
619
  def handle_incoming(
        %{
          "type" => "Undo",
620
621
622
623
624
625
626
627
628
          "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)
normandy's avatar
normandy committed
629
    else
Maksim's avatar
Maksim committed
630
      _e -> :error
normandy's avatar
normandy committed
631
632
633
    end
  end

minibikini's avatar
minibikini committed
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
  def handle_incoming(
        %{
          "type" => "Move",
          "actor" => origin_actor,
          "object" => origin_actor,
          "target" => target_actor
        },
        _options
      ) do
    with %User{} = origin_user <- User.get_cached_by_ap_id(origin_actor),
         {:ok, %User{} = target_user} <- User.get_or_fetch_by_ap_id(target_actor),
         true <- origin_actor in target_user.also_known_as do
      ActivityPub.move(origin_user, target_user, false)
    else
      _e -> :error
    end
  end

652
  def handle_incoming(_, _), do: :error
653

654
  @spec get_obj_helper(String.t(), Keyword.t()) :: {:ok, Object.t()} | nil
655
  def get_obj_helper(id, options \\ []) do
Maksim's avatar
Maksim committed
656
657
658
    case Object.normalize(id, true, options) do
      %Object{} = object -> {:ok, object}
      _ -> nil
659
    end
660
661
  end

662
  @spec get_embedded_obj_helper(String.t() | Object.t(), User.t()) :: {:ok, Object.t()} | nil
Thibaut Girka's avatar
Thibaut Girka committed
663
  def get_embedded_obj_helper(%{"attributedTo" => attributed_to, "id" => object_id} = data, %User{
664
665
        ap_id: ap_id
      })
Thibaut Girka's avatar
Thibaut Girka committed
666
      when attributed_to == ap_id do
667
668
669
670
671
    with {:ok, activity} <-
           handle_incoming(%{
             "type" => "Create",
             "to" => data["to"],
             "cc" => data["cc"],
Thibaut Girka's avatar
Thibaut Girka committed
672
             "actor" => attributed_to,
673
674
675
676
677
678
679
680
681
682
683
684
             "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

685
686
687
688
  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)
689
690
691
692
    else
      _e -> object
    end
  end
lain's avatar
lain committed
693

694
695
  def set_reply_to_uri(obj), do: obj

696
697
698
699
  @doc """
  Serialized Mastodon-compatible `replies` collection containing _self-replies_.
  Based on Mastodon's ActivityPub::NoteSerializer#replies.
  """
700
  def set_replies(obj_data) do
701
    replies_uris =
Ivan Tashkinov's avatar
Ivan Tashkinov committed
702
703
      with limit when limit > 0 <-
             Pleroma.Config.get([:activitypub, :note_replies_output_limit], 0),
704
705
706
707
           %Object{} = object <- Object.get_cached_by_ap_id(obj_data["id"]) do
        object
        |> Object.self_replies()
        |> select([o], fragment("?->>'id'", o.data))
708
709
        |> limit(^limit)
        |> Repo.all()
Ivan Tashkinov's avatar
Ivan Tashkinov committed
710
711
      else
        _ -> []
712
713
      end

Ivan Tashkinov's avatar
Ivan Tashkinov committed
714
    set_replies(obj_data, replies_uris)
715
716
  end

Ivan Tashkinov's avatar
Ivan Tashkinov committed
717
  defp set_replies(obj, []) do
718
719
720
721
722
723
    obj
  end

  defp set_replies(obj, replies_uris) do
    replies_collection = %{
      "type" => "Collection",
724
      "items" => replies_uris
725
726
727
728
729
    }

    Map.merge(obj, %{"replies" => replies_collection})
  end

Ivan Tashkinov's avatar
Ivan Tashkinov committed
730
731
732
  def replies(%{"replies" => %{"first" => %{"items" => items}}}) when not is_nil(items) do
    items
  end
733

Ivan Tashkinov's avatar
Ivan Tashkinov committed
734
735
  def replies(%{"replies" => %{"items" => items}}) when not is_nil(items) do
    items
736
737
738
739
  end

  def replies(_), do: []

740
  # Prepares the object of an outgoing create activity.
lain's avatar
lain committed
741
742
  def prepare_object(object) do
    object
lain's avatar
lain committed
743
    |> set_sensitive
lain's avatar
lain committed
744
    |> add_hashtags
lain's avatar
lain committed
745
    |> add_mention_tags
lain's avatar
lain committed
746
    |> add_emoji_tags
lain's avatar
lain committed
747
    |> add_attributed_to
lain's avatar
lain committed
748
    |> prepare_attachments
lain's avatar
lain committed
749
    |> set_conversation
750
    |> set_reply_to_uri
751
    |> set_replies
752
753
    |> strip_internal_fields
    |> strip_internal_tags
754
    |> set_type
lain's avatar
lain committed
755
756
  end

feld's avatar
feld committed
757
758
759
760
  #  @doc
  #  """
  #  internal -> Mastodon
  #  """
lain's avatar
lain committed
761

762
763
  def prepare_outgoing(%{"type" => activity_type, "object" => object_id} = data)
      when activity_type in ["Create", "Listen"] do
lain's avatar
lain committed
764
    object =
minibikini's avatar
minibikini committed
765
766
767
      object_id
      |> Object.normalize()
      |> Map.get(:data)
lain's avatar
lain committed
768
769
770
771
772
      |> prepare_object

    data =
      data
      |> Map.put("object", object)
lain's avatar
lain committed
773
      |> Map.merge(Utils.make_json_ld_header())
minibikini's avatar
minibikini committed
774
      |> Map.delete("bcc")
lain's avatar
lain committed
775
776
777
778

    {:ok, data}
  end

779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
  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
800
801
802
  # Mastodon Accept/Reject requires a non-normalized object containing the actor URIs,
  # because of course it does.
  def prepare_outgoing(%{"type" => "Accept"} = data) do
803
    with follow_activity <- Activity.normalize(data["object"]) do
kaniini's avatar
kaniini committed
804
805
806
807
808
809
810
811
812
813
      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
814
        |> Map.merge(Utils.make_json_ld_header())
kaniini's avatar
kaniini committed
815
816
817
818
819

      {:ok, data}
    end
  end

820
  def prepare_outgoing(%{"type" => "Reject"} = data) do
821
    with follow_activity <- Activity.normalize(data["object"]) do
822
823
824
825
826
827
828
829
830
831
      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
832
        |> Map.merge(Utils.make_json_ld_header())
833
834
835
836
837

      {:ok, data}
    end
  end

feld's avatar
feld committed
838
  def prepare_outgoing(%{"type" => _type} = data) do
lain's avatar
lain committed
839
840
    data =
      data
841
      |> strip_internal_fields
lain's avatar
lain committed
842
      |> maybe_fix_object_url
lain's avatar
lain committed
843
      |> Map.merge(Utils.make_json_ld_header())
844
845
846
847

    {:ok, data}
  end

848
849
850
851
852
853
  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)
854
    else
855
856
857
858
859
860
      {:fetch, e} ->
        Logger.error("Couldn't fetch #{object} #{inspect(e)}")
        data

      _ ->
        data
861
862
863
    end
  end

864
865
  def maybe_fix_object_url(data), do: data

lain's avatar
lain committed
866
  def add_hashtags(object) do
lain's avatar
lain committed
867
868
    tags =
      (object["tag"] || [])
869
870
871
872
873
874
875
876
877
878
879
880
      |> Enum.map(fn
        # Expand internal representation tags into AS2 tags.
        tag when is_binary(tag) ->
          %{
            "href" => Pleroma.Web.Endpoint.url() <> "/tags/#{tag}",
            "name" => "##{tag}",
            "type" => "Hashtag"
          }

        # Do not process tags which are already AS2 tag objects.
        tag when is_map(tag) ->
          tag
lain's avatar
lain committed
881
      end)
lain's avatar
lain committed
882

883
    Map.put(object, "tag", tags)
lain's avatar
lain committed
884
885
  end

886
887
  # TODO These should be added on our side on insertion, it doesn't make much
  # sense to regenerate these all the time
lain's avatar
lain committed
888
  def add_mention_tags(object) do
889
890
891
892
893
    to = object["to"] || []
    cc = object["cc"] || []
    mentioned = User.get_users_from_set(to ++ cc, local_only: false)

    mentions = Enum.map(mentioned, &build_mention_tag/1)
lain's avatar
lain committed
894

lain's avatar
lain committed
895
    tags = object["tag"] || []
896
    Map.put(object, "tag", tags ++ mentions)
lain's avatar
lain committed
897
898
  end

Maksim's avatar
Maksim committed
899
900
901
  defp build_mention_tag(%{ap_id: ap_id, nickname: nickname} = _) do
    %{"type" => "Mention", "href" => ap_id, "name" => "@#{nickname}"}
  end
Haelwenn's avatar
Haelwenn committed
902

903
  def take_emoji_tags(%User{emoji: emoji}) do
Maksim's avatar
Maksim committed
904
    emoji
905
    |> Map.to_list()
Maksim's avatar
Maksim committed
906
    |> Enum.map(&build_emoji_tag/1)
Haelwenn's avatar
Haelwenn committed
907
908
  end

lain's avatar
lain committed
909
  # TODO: we should probably send mtime instead of unix epoch time for updated
Haelwenn's avatar
Haelwenn committed
910
  def add_emoji_tags(%{"emoji" => emoji} = object) do
lain's avatar
lain committed
911
    tags = object["tag"] || []
lain's avatar
lain committed
912

Maksim's avatar
Maksim committed
913
    out = Enum.map(emoji, &build_emoji_tag/1)
lain's avatar
lain committed
914

915
    Map.put(object, "tag", tags ++ out)
lain's avatar
lain committed
916
917
  end

918
  def add_emoji_tags(object), do: object
Haelwenn's avatar
Haelwenn committed
919

Maksim's avatar
Maksim committed
920
921
922
923
924
925
926
927
928
929
  defp build_emoji_tag({name, url}) do
    %{
      "icon" => %{"url" => url, "type" => "Image"},
      "name" => ":" <> name <> ":",
      "type" => "Emoji",
      "updated" => "1970-01-01T00:00:00Z",
      "id" => url
    }
  end

lain's avatar
lain committed
930
931
932
933
  def set_conversation(object) do
    Map.put(object, "conversation", object["context"])
  end

934
  def set_sensitive(%{"sensitive" => _} = object) do
935
936
937
    object
  end

lain's avatar
lain committed
938
939
940
941
942
  def set_sensitive(object) do
    tags = object["tag"] || []
    Map.put(object, "sensitive", "nsfw" in tags)
  end

943
944
945
946
947
948
  def set_type(%{"type" => "Answer"} = object) do
    Map.put(object, "type", "Note")
  end

  def set_type(object), do: object

lain's avatar
lain committed
949
  def add_attributed_to(object) do
950
    attributed_to = object["attributedTo"] || object["actor"]
951
    Map.put(object, "attributedTo", attributed_to)
952
  end
lain's avatar
lain committed
953

954
955
956
  # TODO: Revisit this
  def prepare_attachments(%{"type" => "ChatMessage"} = object), do: object

lain's avatar
lain committed
957
  def prepare_attachments(object) do
lain's avatar
lain committed
958
    attachments =
Maksim's avatar
Maksim committed
959
960
      object
      |> Map.get("attachment", [])
lain's avatar
lain committed
961
962
      |> Enum.map(fn data ->
        [%{"mediaType" => media_type, "href" => href} | _] = data["url"]
Maksim's avatar
Maksim committed
963
964
965
966
967
968
969

        %{
          "url" => href,
          "mediaType" => media_type,
          "name" => data["name"],
          "type" => "Document"
        }
lain's avatar
lain committed
970
      end)
lain's avatar
lain committed
971

972
    Map.put(object, "attachment", attachments)
lain's avatar
lain committed
973
  end
lain's avatar
lain committed
974

975
  def strip_internal_fields(object) do
Maksim's avatar
Maksim committed
976
    Map.drop(object, Pleroma.Constants.object_internal_fields())