transmogrifier.ex 27.9 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
255
256
257
          |> Maps.put_if_present("mediaType", media_type)
          |> Maps.put_if_present("name", data["name"])
        else
          nil
        end
lain's avatar
lain committed
258
      end)
Haelwenn's avatar
Haelwenn committed
259
      |> Enum.filter(& &1)
lain's avatar
lain committed
260

261
    Map.put(object, "attachment", attachments)
262
263
  end

264
  def fix_attachments(%{"attachment" => attachment} = object) when is_map(attachment) do
Maksim's avatar
Maksim committed
265
266
267
    object
    |> Map.put("attachment", [attachment])
    |> fix_attachments()
268
269
  end

270
  def fix_attachments(object), do: object
271

272
  def fix_url(%{"url" => url} = object) when is_map(url) do
273
    Map.put(object, "url", url["href"])
274
275
  end

Haelwenn's avatar
Haelwenn committed
276
  def fix_url(%{"url" => url} = object) when is_list(url) do
277
278
279
280
281
282
283
284
285
    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

286
    Map.put(object, "url", url_string)
287
288
289
290
  end

  def fix_url(object), do: object

291
  def fix_emoji(%{"tag" => tags} = object) when is_list(tags) do
lain's avatar
lain committed
292
    emoji =
293
      tags
294
      |> Enum.filter(fn data -> is_map(data) and data["type"] == "Emoji" and data["icon"] end)
lain's avatar
lain committed
295
      |> Enum.reduce(%{}, fn data, mapping ->
296
        name = String.trim(data["name"], ":")
lain's avatar
lain committed
297

298
        Map.put(mapping, name, data["icon"]["url"])
lain's avatar
lain committed
299
      end)
lain's avatar
lain committed
300

301
    Map.put(object, "emoji", emoji)
lain's avatar
lain committed
302
303
  end

304
305
306
307
  def fix_emoji(%{"tag" => %{"type" => "Emoji"} = tag} = object) do
    name = String.trim(tag["name"], ":")
    emoji = %{name => tag["icon"]["url"]}

308
    Map.put(object, "emoji", emoji)
309
310
  end

311
  def fix_emoji(object), do: object
312

313
  def fix_tag(%{"tag" => tag} = object) when is_list(tag) do
lain's avatar
lain committed
314
    tags =
315
      tag
lain's avatar
lain committed
316
      |> Enum.filter(fn data -> data["type"] == "Hashtag" and data["name"] end)
317
318
319
320
321
      |> Enum.map(fn %{"name" => name} ->
        name
        |> String.slice(1..-1)
        |> String.downcase()
      end)
322

323
    Map.put(object, "tag", tag ++ tags)
324
325
  end

326
327
328
329
  def fix_tag(%{"tag" => %{} = tag} = object) do
    object
    |> Map.put("tag", [tag])
    |> fix_tag
330
331
  end

332
  def fix_tag(object), do: object
333

334
335
336
337
338
  # 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)

339
    Map.put(object, "content", content)
340
341
342
343
  end

  def fix_content_map(object), do: object

344
345
  def fix_type(object, options \\ [])

346
347
  def fix_type(%{"inReplyTo" => reply_id, "name" => _} = object, options)
      when is_binary(reply_id) do
348
    with true <- Federator.allowed_thread_distance?(options[:depth]),
349
         {:ok, %{data: %{"type" => "Question"} = _} = _} <- get_obj_helper(reply_id, options) do
350
351
      Map.put(object, "type", "Answer")
    else
352
      _ -> object
353
354
355
    end
  end

356
  def fix_type(object, _), do: object
357

358
359
360
361
362
363
364
365
366
367
368
  # 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

369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
  # 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

392
393
  def handle_incoming(data, options \\ [])

394
395
  # Flag objects are placed ahead of the ID check because Mastodon 2.8 and earlier send them
  # with nil ID.
396
  def handle_incoming(%{"type" => "Flag", "object" => objects, "actor" => actor} = data, _options) do
397
398
399
400
    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.
401
         %User{} = account <- get_reported(objects),
402
403
         # Remove the reported user from the object list.
         statuses <- Enum.filter(objects, fn ap_id -> ap_id != account.ap_id end) do
404
      %{
405
406
407
408
409
        actor: actor,
        context: context,
        account: account,
        statuses: statuses,
        content: content,
410
        additional: %{"cc" => [account.ap_id]}
411
      }
412
      |> ActivityPub.flag()
413
414
415
    end
  end

416
  # disallow objects with bogus IDs
417
418
  def handle_incoming(%{"id" => nil}, _options), do: :error
  def handle_incoming(%{"id" => ""}, _options), do: :error
419
  # length of https:// = 8, should validate better, but good enough for now.
rinpatch's avatar
rinpatch committed
420
  def handle_incoming(%{"id" => id}, _options) when is_binary(id) and byte_size(id) < 8,
421
    do: :error
422

423
424
425
  # TODO: validate those with a Ecto scheme
  # - tags
  # - emoji
426
427
428
429
  def handle_incoming(
        %{"type" => "Create", "object" => %{"type" => objtype} = object} = data,
        options
      )
Haelwenn's avatar
Haelwenn committed
430
      when objtype in ~w{Note Page} do
431
    actor = Containment.get_actor(data)
432

433
    with nil <- Activity.get_create_by_object_ap_id(object["id"]),
434
435
436
437
438
439
440
441
         {: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
442
443
444
445
446
447
448
449
450
        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
451
452
453
454
        end

        {:ok, created_activity}
      end
455
    else
lain's avatar
lain committed
456
      %Activity{} = activity -> {:ok, activity}
457
458
459
460
      _e -> :error
    end
  end

461
462
463
464
465
466
467
468
469
470
471
  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
472
473
      reply_depth = (options[:depth] || 0) + 1
      options = Keyword.put(options, :depth, reply_depth)
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
      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

492
493
494
495
496
497
498
499
500
501
  @misskey_reactions %{
    "like" => "👍",
    "love" => "❤️",
    "laugh" => "😆",
    "hmm" => "🤔",
    "surprise" => "😮",
    "congrats" => "🎉",
    "angry" => "💢",
    "confused" => "😥",
    "rip" => "😇",
502
503
    "pudding" => "🍮",
    "star" => "⭐"
504
505
  }

lain's avatar
lain committed
506
  @doc "Rewrite misskey likes into EmojiReacts"
507
508
509
510
511
512
513
514
  def handle_incoming(
        %{
          "type" => "Like",
          "_misskey_reaction" => reaction
        } = data,
        options
      ) do
    data
lain's avatar
lain committed
515
    |> Map.put("type", "EmojiReact")
516
    |> Map.put("content", @misskey_reactions[reaction] || reaction)
517
518
519
    |> handle_incoming(options)
  end

Haelwenn's avatar
Haelwenn committed
520
  def handle_incoming(
521
        %{"type" => "Create", "object" => %{"type" => objtype, "id" => obj_id}} = data,
Haelwenn's avatar
Haelwenn committed
522
        _options
Haelwenn's avatar
Haelwenn committed
523
      )
Haelwenn's avatar
Haelwenn committed
524
      when objtype in ~w{Question Answer ChatMessage Audio Video Event Article} do
525
526
    data = Map.put(data, "object", strip_internal_fields(data["object"]))

Haelwenn's avatar
Haelwenn committed
527
    with {:ok, %User{}} <- ObjectValidator.fetch_actor(data),
528
         nil <- Activity.get_create_by_object_ap_id(obj_id),
Haelwenn's avatar
Haelwenn committed
529
530
         {:ok, activity, _} <- Pipeline.common_pipeline(data, local: false) do
      {:ok, activity}
531
532
533
    else
      %Activity{} = activity -> {:ok, activity}
      e -> e
Haelwenn's avatar
Haelwenn committed
534
535
536
    end
  end

537
  def handle_incoming(%{"type" => type} = data, _options)
538
      when type in ~w{Like EmojiReact Announce} do
lain's avatar
lain committed
539
540
541
    with :ok <- ObjectValidator.fetch_actor_and_object(data),
         {:ok, activity, _meta} <-
           Pipeline.common_pipeline(data, local: false) do
lain's avatar
lain committed
542
543
      {:ok, activity}
    else
544
      e -> {:error, e}
lain's avatar
lain committed
545
546
547
    end
  end

lain's avatar
lain committed
548
  def handle_incoming(
549
        %{"type" => type} = data,
550
        _options
551
      )
552
      when type in ~w{Update Block Follow Accept Reject} do
553
    with {:ok, %User{}} <- ObjectValidator.fetch_actor(data),
554
555
         {:ok, activity, _} <-
           Pipeline.common_pipeline(data, local: false) do
556
      {:ok, activity}
lain's avatar
lain committed
557
558
559
    end
  end

lain's avatar
lain committed
560
  def handle_incoming(
561
        %{"type" => "Delete"} = data,
562
        _options
lain's avatar
lain committed
563
      ) do
564
565
    with {:ok, activity, _} <-
           Pipeline.common_pipeline(data, local: false) do
lain's avatar
lain committed
566
      {:ok, activity}
567
568
569
    else
      {:error, {:validate_object, _}} = e ->
        # Check if we have a create activity for this
570
        with {:ok, object_id} <- ObjectValidators.ObjectID.cast(data["object"]),
571
572
573
574
575
576
577
578
579
             %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
580
581
582
    end
  end

normandy's avatar
normandy committed
583
584
585
586
587
588
  def handle_incoming(
        %{
          "type" => "Undo",
          "object" => %{"type" => "Follow", "object" => followed},
          "actor" => follower,
          "id" => id
589
590
        } = _data,
        _options
normandy's avatar
normandy committed
591
      ) do
normandy's avatar
normandy committed
592
    with %User{local: true} = followed <- User.get_cached_by_ap_id(followed),
593
         {:ok, %User{} = follower} <- User.get_or_fetch_by_ap_id(follower),
normandy's avatar
normandy committed
594
         {:ok, activity} <- ActivityPub.unfollow(follower, followed, id, false) do
normandy's avatar
normandy committed
595
596
597
      User.unfollow(follower, followed)
      {:ok, activity}
    else
Maksim's avatar
Maksim committed
598
      _e -> :error
normandy's avatar
normandy committed
599
600
601
    end
  end

602
603
604
  def handle_incoming(
        %{
          "type" => "Undo",
605
          "object" => %{"type" => type}
606
607
        } = data,
        _options
608
      )
609
      when type in ["Like", "EmojiReact", "Announce", "Block"] do
610
    with {:ok, activity, _} <- Pipeline.common_pipeline(data, local: false) do
611
612
613
614
      {:ok, activity}
    end
  end

615
  # For Undos that don't have the complete object attached, try to find it in our database.
normandy's avatar
normandy committed
616
617
618
  def handle_incoming(
        %{
          "type" => "Undo",
619
620
621
622
623
624
625
626
627
          "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
628
    else
Maksim's avatar
Maksim committed
629
      _e -> :error
normandy's avatar
normandy committed
630
631
632
    end
  end

minibikini's avatar
minibikini committed
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
  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

651
  def handle_incoming(_, _), do: :error
652

653
  @spec get_obj_helper(String.t(), Keyword.t()) :: {:ok, Object.t()} | nil
654
  def get_obj_helper(id, options \\ []) do
Maksim's avatar
Maksim committed
655
656
657
    case Object.normalize(id, true, options) do
      %Object{} = object -> {:ok, object}
      _ -> nil
658
    end
659
660
  end

661
  @spec get_embedded_obj_helper(String.t() | Object.t(), User.t()) :: {:ok, Object.t()} | nil
Thibaut Girka's avatar
Thibaut Girka committed
662
  def get_embedded_obj_helper(%{"attributedTo" => attributed_to, "id" => object_id} = data, %User{
663
664
        ap_id: ap_id
      })
Thibaut Girka's avatar
Thibaut Girka committed
665
      when attributed_to == ap_id do
666
667
668
669
670
    with {:ok, activity} <-
           handle_incoming(%{
             "type" => "Create",
             "to" => data["to"],
             "cc" => data["cc"],
Thibaut Girka's avatar
Thibaut Girka committed
671
             "actor" => attributed_to,
672
673
674
675
676
677
678
679
680
681
682
683
             "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

684
685
686
687
  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)
688
689
690
691
    else
      _e -> object
    end
  end
lain's avatar
lain committed
692

693
694
  def set_reply_to_uri(obj), do: obj

695
696
697
698
  @doc """
  Serialized Mastodon-compatible `replies` collection containing _self-replies_.
  Based on Mastodon's ActivityPub::NoteSerializer#replies.
  """
699
  def set_replies(obj_data) do
700
    replies_uris =
Ivan Tashkinov's avatar
Ivan Tashkinov committed
701
702
      with limit when limit > 0 <-
             Pleroma.Config.get([:activitypub, :note_replies_output_limit], 0),
703
704
705
706
           %Object{} = object <- Object.get_cached_by_ap_id(obj_data["id"]) do
        object
        |> Object.self_replies()
        |> select([o], fragment("?->>'id'", o.data))
707
708
        |> limit(^limit)
        |> Repo.all()
Ivan Tashkinov's avatar
Ivan Tashkinov committed
709
710
      else
        _ -> []
711
712
      end

Ivan Tashkinov's avatar
Ivan Tashkinov committed
713
    set_replies(obj_data, replies_uris)
714
715
  end

Ivan Tashkinov's avatar
Ivan Tashkinov committed
716
  defp set_replies(obj, []) do
717
718
719
720
721
722
    obj
  end

  defp set_replies(obj, replies_uris) do
    replies_collection = %{
      "type" => "Collection",
723
      "items" => replies_uris
724
725
726
727
728
    }

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

Ivan Tashkinov's avatar
Ivan Tashkinov committed
729
730
731
  def replies(%{"replies" => %{"first" => %{"items" => items}}}) when not is_nil(items) do
    items
  end
732

Ivan Tashkinov's avatar
Ivan Tashkinov committed
733
734
  def replies(%{"replies" => %{"items" => items}}) when not is_nil(items) do
    items
735
736
737
738
  end

  def replies(_), do: []

739
  # Prepares the object of an outgoing create activity.
lain's avatar
lain committed
740
741
  def prepare_object(object) do
    object
lain's avatar
lain committed
742
    |> set_sensitive
lain's avatar
lain committed
743
    |> add_hashtags
lain's avatar
lain committed
744
    |> add_mention_tags
lain's avatar
lain committed
745
    |> add_emoji_tags
lain's avatar
lain committed
746
    |> add_attributed_to
lain's avatar
lain committed
747
    |> prepare_attachments
lain's avatar
lain committed
748
    |> set_conversation
749
    |> set_reply_to_uri
750
    |> set_replies
751
752
    |> strip_internal_fields
    |> strip_internal_tags
753
    |> set_type
lain's avatar
lain committed
754
755
  end

feld's avatar
feld committed
756
757
758
759
  #  @doc
  #  """
  #  internal -> Mastodon
  #  """
lain's avatar
lain committed
760

761
762
  def prepare_outgoing(%{"type" => activity_type, "object" => object_id} = data)
      when activity_type in ["Create", "Listen"] do
lain's avatar
lain committed
763
    object =
minibikini's avatar
minibikini committed
764
765
766
      object_id
      |> Object.normalize()
      |> Map.get(:data)
lain's avatar
lain committed
767
768
769
770
771
      |> prepare_object

    data =
      data
      |> Map.put("object", object)
lain's avatar
lain committed
772
      |> Map.merge(Utils.make_json_ld_header())
minibikini's avatar
minibikini committed
773
      |> Map.delete("bcc")
lain's avatar
lain committed
774
775
776
777

    {:ok, data}
  end

778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
  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
799
800
801
  # Mastodon Accept/Reject requires a non-normalized object containing the actor URIs,
  # because of course it does.
  def prepare_outgoing(%{"type" => "Accept"} = data) do
802
    with follow_activity <- Activity.normalize(data["object"]) do
kaniini's avatar
kaniini committed
803
804
805
806
807
808
809
810
811
812
      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
813
        |> Map.merge(Utils.make_json_ld_header())
kaniini's avatar
kaniini committed
814
815
816
817
818

      {:ok, data}
    end
  end

819
  def prepare_outgoing(%{"type" => "Reject"} = data) do
820
    with follow_activity <- Activity.normalize(data["object"]) do
821
822
823
824
825
826
827
828
829
830
      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
831
        |> Map.merge(Utils.make_json_ld_header())
832
833
834
835
836

      {:ok, data}
    end
  end

feld's avatar
feld committed
837
  def prepare_outgoing(%{"type" => _type} = data) do
lain's avatar
lain committed
838
839
    data =
      data
840
      |> strip_internal_fields
lain's avatar
lain committed
841
      |> maybe_fix_object_url
lain's avatar
lain committed
842
      |> Map.merge(Utils.make_json_ld_header())
843
844
845
846

    {:ok, data}
  end

847
848
849
850
851
852
  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)
853
    else
854
855
856
857
858
859
      {:fetch, e} ->
        Logger.error("Couldn't fetch #{object} #{inspect(e)}")
        data

      _ ->
        data
860
861
862
    end
  end

863
864
  def maybe_fix_object_url(data), do: data

lain's avatar
lain committed
865
  def add_hashtags(object) do
lain's avatar
lain committed
866
867
    tags =
      (object["tag"] || [])
868
869
870
871
872
873
874
875
876
877
878
879
      |> 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
880
      end)
lain's avatar
lain committed
881

882
    Map.put(object, "tag", tags)
lain's avatar
lain committed
883
884
  end

885
886
  # 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
887
  def add_mention_tags(object) do
888
889
890
891
892
    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
893

lain's avatar
lain committed
894
    tags = object["tag"] || []
895
    Map.put(object, "tag", tags ++ mentions)
lain's avatar
lain committed
896
897
  end

Maksim's avatar
Maksim committed
898
899
900
  defp build_mention_tag(%{ap_id: ap_id, nickname: nickname} = _) do
    %{"type" => "Mention", "href" => ap_id, "name" => "@#{nickname}"}
  end
Haelwenn's avatar
Haelwenn committed
901

902
  def take_emoji_tags(%User{emoji: emoji}) do
Maksim's avatar
Maksim committed
903
    emoji
904
    |> Map.to_list()
Maksim's avatar
Maksim committed
905
    |> Enum.map(&build_emoji_tag/1)
Haelwenn's avatar
Haelwenn committed
906
907
  end

lain's avatar
lain committed
908
  # TODO: we should probably send mtime instead of unix epoch time for updated
Haelwenn's avatar
Haelwenn committed
909
  def add_emoji_tags(%{"emoji" => emoji} = object) do
lain's avatar
lain committed
910
    tags = object["tag"] || []
lain's avatar
lain committed
911

Maksim's avatar
Maksim committed
912
    out = Enum.map(emoji, &build_emoji_tag/1)
lain's avatar
lain committed
913

914
    Map.put(object, "tag", tags ++ out)
lain's avatar
lain committed
915
916
  end

917
  def add_emoji_tags(object), do: object
Haelwenn's avatar
Haelwenn committed
918

Maksim's avatar
Maksim committed
919
920
921
922
923
924
925
926
927
928
  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
929
930
931
932
  def set_conversation(object) do
    Map.put(object, "conversation", object["context"])
  end

933
  def set_sensitive(%{"sensitive" => _} = object) do
934
935
936
    object
  end

lain's avatar
lain committed
937
938
939
940
941
  def set_sensitive(object) do
    tags = object["tag"] || []
    Map.put(object, "sensitive", "nsfw" in tags)
  end

942
943
944
945
946
947
  def set_type(%{"type" => "Answer"} = object) do
    Map.put(object, "type", "Note")
  end

  def set_type(object), do: object

lain's avatar
lain committed
948
  def add_attributed_to(object) do
949
    attributed_to = object["attributedTo"] || object["actor"]
950
    Map.put(object, "attributedTo", attributed_to)
951
  end
lain's avatar
lain committed
952

953
954
955
  # TODO: Revisit this
  def prepare_attachments(%{"type" => "ChatMessage"} = object), do: object

lain's avatar
lain committed
956
  def prepare_attachments(object) do
lain's avatar
lain committed
957
    attachments =
Maksim's avatar
Maksim committed
958
959
      object
      |> Map.get("attachment", [])
lain's avatar
lain committed
960
961
      |> Enum.map(fn data ->
        [%{"mediaType" => media_type, "href" => href} | _] = data["url"]
Maksim's avatar
Maksim committed
962
963
964
965
966
967
968

        %{
          "url" => href,
          "mediaType" => media_type,
          "name" => data["name"],
          "type" => "Document"
        }
lain's avatar
lain committed
969
      end)
lain's avatar
lain committed
970

971
    Map.put(object, "attachment", attachments)
lain's avatar
lain committed
972
  end
lain's avatar
lain committed
973

974
  def strip_internal_fields(object) do
Maksim's avatar
Maksim committed
975
    Map.drop(object, Pleroma.Constants.object_internal_fields())
976
977
978
  end

  defp strip_internal_tags(%{"tag" => tags} = object) do
979