git.squeep.com Git - akkoma/blob - lib/pleroma/web/activity_pub/transmogrifier.ex

   1 defmodule Pleroma.Web.ActivityPub.Transmogrifier do
   2   @moduledoc """
   3   A module to handle coding from internal to wire ActivityPub and back.
   4   """
   5   alias Pleroma.User
   6   alias Pleroma.Object
   7   alias Pleroma.Activity
   8   alias Pleroma.Repo
   9   alias Pleroma.Web.ActivityPub.ActivityPub
  10   alias Pleroma.Web.ActivityPub.Utils
  11
  12   import Ecto.Query
  13
  14   require Logger
  15
  16   def get_actor(%{"actor" => actor}) when is_binary(actor) do
  17     actor
  18   end
  19
  20   def get_actor(%{"actor" => actor}) when is_list(actor) do
  21     if is_binary(Enum.at(actor, 0)) do
  22       Enum.at(actor, 0)
  23     else
  24       Enum.find(actor, fn %{"type" => type} -> type in ["Person", "Service", "Application"] end)
  25       |> Map.get("id")
  26     end
  27   end
  28
  29   def get_actor(%{"actor" => %{"id" => id}}) when is_bitstring(id) do
  30     id
  31   end
  32
  33   @doc """
  34   Checks that an imported AP object's actor matches the domain it came from.
  35   """
  36   def contain_origin(id, %{"actor" => actor} = params) do
  37     id_uri = URI.parse(id)
  38     actor_uri = URI.parse(get_actor(params))
  39
  40     if id_uri.host == actor_uri.host do
  41       :ok
  42     else
  43       :error
  44     end
  45   end
  46
  47   @doc """
  48   Modifies an incoming AP object (mastodon format) to our internal format.
  49   """
  50   def fix_object(object) do
  51     object
  52     |> fix_actor
  53     |> fix_attachments
  54     |> fix_context
  55     |> fix_in_reply_to
  56     |> fix_emoji
  57     |> fix_tag
  58     |> fix_content_map
  59     |> fix_likes
  60     |> fix_addressing
  61   end
  62
  63   def fix_addressing_list(map, field) do
  64     if is_binary(map[field]) do
  65       map
  66       |> Map.put(field, [map[field]])
  67     else
  68       map
  69     end
  70   end
  71
  72   def fix_addressing(map) do
  73     map
  74     |> fix_addressing_list("to")
  75     |> fix_addressing_list("cc")
  76     |> fix_addressing_list("bto")
  77     |> fix_addressing_list("bcc")
  78   end
  79
  80   def fix_actor(%{"attributedTo" => actor} = object) do
  81     object
  82     |> Map.put("actor", get_actor(%{"actor" => actor}))
  83   end
  84
  85   def fix_likes(%{"likes" => likes} = object)
  86       when is_bitstring(likes) do
  87     # Check for standardisation
  88     # This is what Peertube does
  89     # curl -H 'Accept: application/activity+json' $likes | jq .totalItems
  90     object
  91     |> Map.put("likes", [])
  92     |> Map.put("like_count", 0)
  93   end
  94
  95   def fix_likes(object) do
  96     object
  97   end
  98
  99   def fix_in_reply_to(%{"inReplyTo" => in_reply_to} = object)
 100       when not is_nil(in_reply_to) do
 101     in_reply_to_id =
 102       cond do
 103         is_bitstring(in_reply_to) ->
 104           in_reply_to
 105
 106         is_map(in_reply_to) && is_bitstring(in_reply_to["id"]) ->
 107           in_reply_to["id"]
 108
 109         is_list(in_reply_to) && is_bitstring(Enum.at(in_reply_to, 0)) ->
 110           Enum.at(in_reply_to, 0)
 111
 112         # Maybe I should output an error too?
 113         true ->
 114           ""
 115       end
 116
 117     case fetch_obj_helper(in_reply_to_id) do
 118       {:ok, replied_object} ->
 119         with %Activity{} = activity <-
 120                Activity.get_create_activity_by_object_ap_id(replied_object.data["id"]) do
 121           object
 122           |> Map.put("inReplyTo", replied_object.data["id"])
 123           |> Map.put("inReplyToAtomUri", object["inReplyToAtomUri"] || in_reply_to_id)
 124           |> Map.put("inReplyToStatusId", activity.id)
 125           |> Map.put("conversation", replied_object.data["context"] || object["conversation"])
 126           |> Map.put("context", replied_object.data["context"] || object["conversation"])
 127         else
 128           e ->
 129             Logger.error("Couldn't fetch \"#{inspect(in_reply_to_id)}\", error: #{inspect(e)}")
 130             object
 131         end
 132
 133       e ->
 134         Logger.error("Couldn't fetch \"#{inspect(in_reply_to_id)}\", error: #{inspect(e)}")
 135         object
 136     end
 137   end
 138
 139   def fix_in_reply_to(object), do: object
 140
 141   def fix_context(object) do
 142     context = object["context"] || object["conversation"] || Utils.generate_context_id()
 143
 144     object
 145     |> Map.put("context", context)
 146     |> Map.put("conversation", context)
 147   end
 148
 149   def fix_attachments(%{"attachment" => attachment} = object) when is_list(attachment) do
 150     attachments =
 151       attachment
 152       |> Enum.map(fn data ->
 153         url = [%{"type" => "Link", "mediaType" => data["mediaType"], "href" => data["url"]}]
 154         Map.put(data, "url", url)
 155       end)
 156
 157     object
 158     |> Map.put("attachment", attachments)
 159   end
 160
 161   def fix_attachments(%{"attachment" => attachment} = object) when is_map(attachment) do
 162     Map.put(object, "attachment", [attachment])
 163     |> fix_attachments()
 164   end
 165
 166   def fix_attachments(object), do: object
 167
 168   def fix_emoji(%{"tag" => tags} = object) when is_list(tags) do
 169     emoji = tags |> Enum.filter(fn data -> data["type"] == "Emoji" and data["icon"] end)
 170
 171     emoji =
 172       emoji
 173       |> Enum.reduce(%{}, fn data, mapping ->
 174         name = String.trim(data["name"], ":")
 175
 176         mapping |> Map.put(name, data["icon"]["url"])
 177       end)
 178
 179     # we merge mastodon and pleroma emoji into a single mapping, to allow for both wire formats
 180     emoji = Map.merge(object["emoji"] || %{}, emoji)
 181
 182     object
 183     |> Map.put("emoji", emoji)
 184   end
 185
 186   def fix_emoji(%{"tag" => %{"type" => "Emoji"} = tag} = object) do
 187     name = String.trim(tag["name"], ":")
 188     emoji = %{name => tag["icon"]["url"]}
 189
 190     object
 191     |> Map.put("emoji", emoji)
 192   end
 193
 194   def fix_emoji(object), do: object
 195
 196   def fix_tag(%{"tag" => tag} = object) when is_list(tag) do
 197     tags =
 198       tag
 199       |> Enum.filter(fn data -> data["type"] == "Hashtag" and data["name"] end)
 200       |> Enum.map(fn data -> String.slice(data["name"], 1..-1) end)
 201
 202     combined = tag ++ tags
 203
 204     object
 205     |> Map.put("tag", combined)
 206   end
 207
 208   def fix_tag(%{"tag" => %{"type" => "Hashtag", "name" => hashtag} = tag} = object) do
 209     combined = [tag, String.slice(hashtag, 1..-1)]
 210
 211     object
 212     |> Map.put("tag", combined)
 213   end
 214
 215   def fix_tag(object), do: object
 216
 217   # content map usually only has one language so this will do for now.
 218   def fix_content_map(%{"contentMap" => content_map} = object) do
 219     content_groups = Map.to_list(content_map)
 220     {_, content} = Enum.at(content_groups, 0)
 221
 222     object
 223     |> Map.put("content", content)
 224   end
 225
 226   def fix_content_map(object), do: object
 227
 228   # disallow objects with bogus IDs
 229   def handle_incoming(%{"id" => nil}), do: :error
 230   def handle_incoming(%{"id" => ""}), do: :error
 231   # length of https:// = 8, should validate better, but good enough for now.
 232   def handle_incoming(%{"id" => id}) when not (is_binary(id) and length(id) > 8), do: :error
 233
 234   # TODO: validate those with a Ecto scheme
 235   # - tags
 236   # - emoji
 237   def handle_incoming(%{"type" => "Create", "object" => %{"type" => objtype} = object} = data)
 238       when objtype in ["Article", "Note", "Video"] do
 239     actor = get_actor(data)
 240
 241     data =
 242       Map.put(data, "actor", actor)
 243       |> fix_addressing
 244
 245     with nil <- Activity.get_create_activity_by_object_ap_id(object["id"]),
 246          %User{} = user <- User.get_or_fetch_by_ap_id(data["actor"]) do
 247       object = fix_object(data["object"])
 248
 249       params = %{
 250         to: data["to"],
 251         object: object,
 252         actor: user,
 253         context: object["conversation"],
 254         local: false,
 255         published: data["published"],
 256         additional:
 257           Map.take(data, [
 258             "cc",
 259             "id"
 260           ])
 261       }
 262
 263       ActivityPub.create(params)
 264     else
 265       %Activity{} = activity -> {:ok, activity}
 266       _e -> :error
 267     end
 268   end
 269
 270   def handle_incoming(
 271         %{"type" => "Follow", "object" => followed, "actor" => follower, "id" => id} = data
 272       ) do
 273     with %User{local: true} = followed <- User.get_cached_by_ap_id(followed),
 274          %User{} = follower <- User.get_or_fetch_by_ap_id(follower),
 275          {:ok, activity} <- ActivityPub.follow(follower, followed, id, false) do
 276       if not User.locked?(followed) do
 277         ActivityPub.accept(%{
 278           to: [follower.ap_id],
 279           actor: followed.ap_id,
 280           object: data,
 281           local: true
 282         })
 283
 284         User.follow(follower, followed)
 285       end
 286
 287       {:ok, activity}
 288     else
 289       _e -> :error
 290     end
 291   end
 292
 293   defp mastodon_follow_hack(%{"id" => id, "actor" => follower_id}, followed) do
 294     with true <- id =~ "follows",
 295          %User{local: true} = follower <- User.get_cached_by_ap_id(follower_id),
 296          %Activity{} = activity <- Utils.fetch_latest_follow(follower, followed) do
 297       {:ok, activity}
 298     else
 299       _ -> {:error, nil}
 300     end
 301   end
 302
 303   defp mastodon_follow_hack(_), do: {:error, nil}
 304
 305   defp get_follow_activity(follow_object, followed) do
 306     with object_id when not is_nil(object_id) <- Utils.get_ap_id(follow_object),
 307          {_, %Activity{} = activity} <- {:activity, Activity.get_by_ap_id(object_id)} do
 308       {:ok, activity}
 309     else
 310       # Can't find the activity. This might a Mastodon 2.3 "Accept"
 311       {:activity, nil} ->
 312         mastodon_follow_hack(follow_object, followed)
 313
 314       _ ->
 315         {:error, nil}
 316     end
 317   end
 318
 319   def handle_incoming(
 320         %{"type" => "Accept", "object" => follow_object, "actor" => actor, "id" => id} = data
 321       ) do
 322     with actor <- get_actor(data),
 323          %User{} = followed <- User.get_or_fetch_by_ap_id(actor),
 324          {:ok, follow_activity} <- get_follow_activity(follow_object, followed),
 325          %User{local: true} = follower <- User.get_cached_by_ap_id(follow_activity.data["actor"]),
 326          {:ok, activity} <-
 327            ActivityPub.accept(%{
 328              to: follow_activity.data["to"],
 329              type: "Accept",
 330              actor: followed.ap_id,
 331              object: follow_activity.data["id"],
 332              local: false
 333            }) do
 334       if not User.following?(follower, followed) do
 335         {:ok, follower} = User.follow(follower, followed)
 336       end
 337
 338       {:ok, activity}
 339     else
 340       _e -> :error
 341     end
 342   end
 343
 344   def handle_incoming(
 345         %{"type" => "Reject", "object" => follow_object, "actor" => actor, "id" => id} = data
 346       ) do
 347     with actor <- get_actor(data),
 348          %User{} = followed <- User.get_or_fetch_by_ap_id(actor),
 349          {:ok, follow_activity} <- get_follow_activity(follow_object, followed),
 350          %User{local: true} = follower <- User.get_cached_by_ap_id(follow_activity.data["actor"]),
 351          {:ok, activity} <-
 352            ActivityPub.accept(%{
 353              to: follow_activity.data["to"],
 354              type: "Accept",
 355              actor: followed.ap_id,
 356              object: follow_activity.data["id"],
 357              local: false
 358            }) do
 359       User.unfollow(follower, followed)
 360
 361       {:ok, activity}
 362     else
 363       _e -> :error
 364     end
 365   end
 366
 367   def handle_incoming(
 368         %{"type" => "Like", "object" => object_id, "actor" => actor, "id" => id} = data
 369       ) do
 370     with actor <- get_actor(data),
 371          %User{} = actor <- User.get_or_fetch_by_ap_id(actor),
 372          {:ok, object} <- get_obj_helper(object_id) || fetch_obj_helper(object_id),
 373          {:ok, activity, _object} <- ActivityPub.like(actor, object, id, false) do
 374       {:ok, activity}
 375     else
 376       _e -> :error
 377     end
 378   end
 379
 380   def handle_incoming(
 381         %{"type" => "Announce", "object" => object_id, "actor" => actor, "id" => id} = data
 382       ) do
 383     with actor <- get_actor(data),
 384          %User{} = actor <- User.get_or_fetch_by_ap_id(actor),
 385          {:ok, object} <- get_obj_helper(object_id) || fetch_obj_helper(object_id),
 386          {:ok, activity, _object} <- ActivityPub.announce(actor, object, id, false) do
 387       {:ok, activity}
 388     else
 389       _e -> :error
 390     end
 391   end
 392
 393   def handle_incoming(
 394         %{"type" => "Update", "object" => %{"type" => object_type} = object, "actor" => actor_id} =
 395           data
 396       )
 397       when object_type in ["Person", "Application", "Service", "Organization"] do
 398     with %User{ap_id: ^actor_id} = actor <- User.get_by_ap_id(object["id"]) do
 399       {:ok, new_user_data} = ActivityPub.user_data_from_user_object(object)
 400
 401       banner = new_user_data[:info]["banner"]
 402       locked = new_user_data[:info]["locked"] || false
 403
 404       update_data =
 405         new_user_data
 406         |> Map.take([:name, :bio, :avatar])
 407         |> Map.put(:info, Map.merge(actor.info, %{"banner" => banner, "locked" => locked}))
 408
 409       actor
 410       |> User.upgrade_changeset(update_data)
 411       |> User.update_and_set_cache()
 412
 413       ActivityPub.update(%{
 414         local: false,
 415         to: data["to"] || [],
 416         cc: data["cc"] || [],
 417         object: object,
 418         actor: actor_id
 419       })
 420     else
 421       e ->
 422         Logger.error(e)
 423         :error
 424     end
 425   end
 426
 427   # TODO: Make secure.
 428   def handle_incoming(
 429         %{"type" => "Delete", "object" => object_id, "actor" => actor, "id" => _id} = data
 430       ) do
 431     object_id = Utils.get_ap_id(object_id)
 432
 433     with actor <- get_actor(data),
 434          %User{} = _actor <- User.get_or_fetch_by_ap_id(actor),
 435          {:ok, object} <- get_obj_helper(object_id) || fetch_obj_helper(object_id),
 436          {:ok, activity} <- ActivityPub.delete(object, false) do
 437       {:ok, activity}
 438     else
 439       _e -> :error
 440     end
 441   end
 442
 443   def handle_incoming(
 444         %{
 445           "type" => "Undo",
 446           "object" => %{"type" => "Announce", "object" => object_id},
 447           "actor" => actor,
 448           "id" => id
 449         } = data
 450       ) do
 451     with actor <- get_actor(data),
 452          %User{} = actor <- User.get_or_fetch_by_ap_id(actor),
 453          {:ok, object} <- get_obj_helper(object_id) || fetch_obj_helper(object_id),
 454          {:ok, activity, _} <- ActivityPub.unannounce(actor, object, id, false) do
 455       {:ok, activity}
 456     else
 457       _e -> :error
 458     end
 459   end
 460
 461   def handle_incoming(
 462         %{
 463           "type" => "Undo",
 464           "object" => %{"type" => "Follow", "object" => followed},
 465           "actor" => follower,
 466           "id" => id
 467         } = _data
 468       ) do
 469     with %User{local: true} = followed <- User.get_cached_by_ap_id(followed),
 470          %User{} = follower <- User.get_or_fetch_by_ap_id(follower),
 471          {:ok, activity} <- ActivityPub.unfollow(follower, followed, id, false) do
 472       User.unfollow(follower, followed)
 473       {:ok, activity}
 474     else
 475       e -> :error
 476     end
 477   end
 478
 479   @ap_config Application.get_env(:pleroma, :activitypub)
 480   @accept_blocks Keyword.get(@ap_config, :accept_blocks)
 481
 482   def handle_incoming(
 483         %{
 484           "type" => "Undo",
 485           "object" => %{"type" => "Block", "object" => blocked},
 486           "actor" => blocker,
 487           "id" => id
 488         } = _data
 489       ) do
 490     with true <- @accept_blocks,
 491          %User{local: true} = blocked <- User.get_cached_by_ap_id(blocked),
 492          %User{} = blocker <- User.get_or_fetch_by_ap_id(blocker),
 493          {:ok, activity} <- ActivityPub.unblock(blocker, blocked, id, false) do
 494       User.unblock(blocker, blocked)
 495       {:ok, activity}
 496     else
 497       e -> :error
 498     end
 499   end
 500
 501   def handle_incoming(
 502         %{"type" => "Block", "object" => blocked, "actor" => blocker, "id" => id} = data
 503       ) do
 504     with true <- @accept_blocks,
 505          %User{local: true} = blocked = User.get_cached_by_ap_id(blocked),
 506          %User{} = blocker = User.get_or_fetch_by_ap_id(blocker),
 507          {:ok, activity} <- ActivityPub.block(blocker, blocked, id, false) do
 508       User.unfollow(blocker, blocked)
 509       User.block(blocker, blocked)
 510       {:ok, activity}
 511     else
 512       e -> :error
 513     end
 514   end
 515
 516   def handle_incoming(
 517         %{
 518           "type" => "Undo",
 519           "object" => %{"type" => "Like", "object" => object_id},
 520           "actor" => actor,
 521           "id" => id
 522         } = data
 523       ) do
 524     with actor <- get_actor(data),
 525          %User{} = actor <- User.get_or_fetch_by_ap_id(actor),
 526          {:ok, object} <- get_obj_helper(object_id) || fetch_obj_helper(object_id),
 527          {:ok, activity, _, _} <- ActivityPub.unlike(actor, object, id, false) do
 528       {:ok, activity}
 529     else
 530       _e -> :error
 531     end
 532   end
 533
 534   def handle_incoming(_), do: :error
 535
 536   def fetch_obj_helper(id) when is_bitstring(id), do: ActivityPub.fetch_object_from_id(id)
 537   def fetch_obj_helper(obj) when is_map(obj), do: ActivityPub.fetch_object_from_id(obj["id"])
 538
 539   def get_obj_helper(id) do
 540     if object = Object.normalize(id), do: {:ok, object}, else: nil
 541   end
 542
 543   def set_reply_to_uri(%{"inReplyTo" => inReplyTo} = object) do
 544     with false <- String.starts_with?(inReplyTo, "http"),
 545          {:ok, %{data: replied_to_object}} <- get_obj_helper(inReplyTo) do
 546       Map.put(object, "inReplyTo", replied_to_object["external_url"] || inReplyTo)
 547     else
 548       _e -> object
 549     end
 550   end
 551
 552   def set_reply_to_uri(obj), do: obj
 553
 554   # Prepares the object of an outgoing create activity.
 555   def prepare_object(object) do
 556     object
 557     |> set_sensitive
 558     |> add_hashtags
 559     |> add_mention_tags
 560     |> add_emoji_tags
 561     |> add_attributed_to
 562     |> prepare_attachments
 563     |> set_conversation
 564     |> set_reply_to_uri
 565   end
 566
 567   #  @doc
 568   #  """
 569   #  internal -> Mastodon
 570   #  """
 571
 572   def prepare_outgoing(%{"type" => "Create", "object" => %{"type" => "Note"} = object} = data) do
 573     object =
 574       object
 575       |> prepare_object
 576
 577     data =
 578       data
 579       |> Map.put("object", object)
 580       |> Map.put("@context", "https://www.w3.org/ns/activitystreams")
 581
 582     {:ok, data}
 583   end
 584
 585   # Mastodon Accept/Reject requires a non-normalized object containing the actor URIs,
 586   # because of course it does.
 587   def prepare_outgoing(%{"type" => "Accept"} = data) do
 588     with follow_activity <- Activity.normalize(data["object"]) do
 589       object = %{
 590         "actor" => follow_activity.actor,
 591         "object" => follow_activity.data["object"],
 592         "id" => follow_activity.data["id"],
 593         "type" => "Follow"
 594       }
 595
 596       data =
 597         data
 598         |> Map.put("object", object)
 599         |> Map.put("@context", "https://www.w3.org/ns/activitystreams")
 600
 601       {:ok, data}
 602     end
 603   end
 604
 605   def prepare_outgoing(%{"type" => "Reject"} = data) do
 606     with follow_activity <- Activity.normalize(data["object"]) do
 607       object = %{
 608         "actor" => follow_activity.actor,
 609         "object" => follow_activity.data["object"],
 610         "id" => follow_activity.data["id"],
 611         "type" => "Follow"
 612       }
 613
 614       data =
 615         data
 616         |> Map.put("object", object)
 617         |> Map.put("@context", "https://www.w3.org/ns/activitystreams")
 618
 619       {:ok, data}
 620     end
 621   end
 622
 623   def prepare_outgoing(%{"type" => _type} = data) do
 624     data =
 625       data
 626       |> maybe_fix_object_url
 627       |> Map.put("@context", "https://www.w3.org/ns/activitystreams")
 628
 629     {:ok, data}
 630   end
 631
 632   def maybe_fix_object_url(data) do
 633     if is_binary(data["object"]) and not String.starts_with?(data["object"], "http") do
 634       case fetch_obj_helper(data["object"]) do
 635         {:ok, relative_object} ->
 636           if relative_object.data["external_url"] do
 637             _data =
 638               data
 639               |> Map.put("object", relative_object.data["external_url"])
 640           else
 641             data
 642           end
 643
 644         e ->
 645           Logger.error("Couldn't fetch #{data["object"]} #{inspect(e)}")
 646           data
 647       end
 648     else
 649       data
 650     end
 651   end
 652
 653   def add_hashtags(object) do
 654     tags =
 655       (object["tag"] || [])
 656       |> Enum.map(fn tag ->
 657         %{
 658           "href" => Pleroma.Web.Endpoint.url() <> "/tags/#{tag}",
 659           "name" => "##{tag}",
 660           "type" => "Hashtag"
 661         }
 662       end)
 663
 664     object
 665     |> Map.put("tag", tags)
 666   end
 667
 668   def add_mention_tags(object) do
 669     recipients = object["to"] ++ (object["cc"] || [])
 670
 671     mentions =
 672       recipients
 673       |> Enum.map(fn ap_id -> User.get_cached_by_ap_id(ap_id) end)
 674       |> Enum.filter(& &1)
 675       |> Enum.map(fn user ->
 676         %{"type" => "Mention", "href" => user.ap_id, "name" => "@#{user.nickname}"}
 677       end)
 678
 679     tags = object["tag"] || []
 680
 681     object
 682     |> Map.put("tag", tags ++ mentions)
 683   end
 684
 685   # TODO: we should probably send mtime instead of unix epoch time for updated
 686   def add_emoji_tags(object) do
 687     tags = object["tag"] || []
 688     emoji = object["emoji"] || []
 689
 690     out =
 691       emoji
 692       |> Enum.map(fn {name, url} ->
 693         %{
 694           "icon" => %{"url" => url, "type" => "Image"},
 695           "name" => ":" <> name <> ":",
 696           "type" => "Emoji",
 697           "updated" => "1970-01-01T00:00:00Z",
 698           "id" => url
 699         }
 700       end)
 701
 702     object
 703     |> Map.put("tag", tags ++ out)
 704   end
 705
 706   def set_conversation(object) do
 707     Map.put(object, "conversation", object["context"])
 708   end
 709
 710   def set_sensitive(object) do
 711     tags = object["tag"] || []
 712     Map.put(object, "sensitive", "nsfw" in tags)
 713   end
 714
 715   def add_attributed_to(object) do
 716     attributedTo = object["attributedTo"] || object["actor"]
 717
 718     object
 719     |> Map.put("attributedTo", attributedTo)
 720   end
 721
 722   def prepare_attachments(object) do
 723     attachments =
 724       (object["attachment"] || [])
 725       |> Enum.map(fn data ->
 726         [%{"mediaType" => media_type, "href" => href} | _] = data["url"]
 727         %{"url" => href, "mediaType" => media_type, "name" => data["name"], "type" => "Document"}
 728       end)
 729
 730     object
 731     |> Map.put("attachment", attachments)
 732   end
 733
 734   defp user_upgrade_task(user) do
 735     old_follower_address = User.ap_followers(user)
 736
 737     q =
 738       from(
 739         u in User,
 740         where: ^old_follower_address in u.following,
 741         update: [
 742           set: [
 743             following:
 744               fragment(
 745                 "array_replace(?,?,?)",
 746                 u.following,
 747                 ^old_follower_address,
 748                 ^user.follower_address
 749               )
 750           ]
 751         ]
 752       )
 753
 754     Repo.update_all(q, [])
 755
 756     maybe_retire_websub(user.ap_id)
 757
 758     # Only do this for recent activties, don't go through the whole db.
 759     # Only look at the last 1000 activities.
 760     since = (Repo.aggregate(Activity, :max, :id) || 0) - 1_000
 761
 762     q =
 763       from(
 764         a in Activity,
 765         where: ^old_follower_address in a.recipients,
 766         where: a.id > ^since,
 767         update: [
 768           set: [
 769             recipients:
 770               fragment(
 771                 "array_replace(?,?,?)",
 772                 a.recipients,
 773                 ^old_follower_address,
 774                 ^user.follower_address
 775               )
 776           ]
 777         ]
 778       )
 779
 780     Repo.update_all(q, [])
 781   end
 782
 783   def upgrade_user_from_ap_id(ap_id, async \\ true) do
 784     with %User{local: false} = user <- User.get_by_ap_id(ap_id),
 785          {:ok, data} <- ActivityPub.fetch_and_prepare_user_from_ap_id(ap_id) do
 786       data =
 787         data
 788         |> Map.put(:info, Map.merge(user.info, data[:info]))
 789
 790       already_ap = User.ap_enabled?(user)
 791
 792       {:ok, user} =
 793         User.upgrade_changeset(user, data)
 794         |> Repo.update()
 795
 796       if !already_ap do
 797         # This could potentially take a long time, do it in the background
 798         if async do
 799           Task.start(fn ->
 800             user_upgrade_task(user)
 801           end)
 802         else
 803           user_upgrade_task(user)
 804         end
 805       end
 806
 807       {:ok, user}
 808     else
 809       e -> e
 810     end
 811   end
 812
 813   def maybe_retire_websub(ap_id) do
 814     # some sanity checks
 815     if is_binary(ap_id) && String.length(ap_id) > 8 do
 816       q =
 817         from(
 818           ws in Pleroma.Web.Websub.WebsubClientSubscription,
 819           where: fragment("? like ?", ws.topic, ^"#{ap_id}%")
 820         )
 821
 822       Repo.delete_all(q)
 823     end
 824   end
 825
 826   def maybe_fix_user_url(data) do
 827     if is_map(data["url"]) do
 828       Map.put(data, "url", data["url"]["href"])
 829     else
 830       data
 831     end
 832   end
 833
 834   def maybe_fix_user_object(data) do
 835     data
 836     |> maybe_fix_user_url
 837   end
 838 end