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

   1 defmodule Pleroma.Web.ActivityPub.ActivityPub do
   2   alias Pleroma.{Activity, Repo, Object, Upload, User, Notification}
   3   alias Pleroma.Web.ActivityPub.{Transmogrifier, MRF}
   4   alias Pleroma.Web.WebFinger
   5   alias Pleroma.Web.Federator
   6   alias Pleroma.Web.OStatus
   7   import Ecto.Query
   8   import Pleroma.Web.ActivityPub.Utils
   9   require Logger
  10
  11   @httpoison Application.get_env(:pleroma, :httpoison)
  12
  13   @instance Application.get_env(:pleroma, :instance)
  14
  15   # For Announce activities, we filter the recipients based on following status for any actors
  16   # that match actual users.  See issue #164 for more information about why this is necessary.
  17   defp get_recipients(%{"type" => "Announce"} = data) do
  18     to = data["to"] || []
  19     cc = data["cc"] || []
  20     recipients = to ++ cc
  21     actor = User.get_cached_by_ap_id(data["actor"])
  22
  23     recipients
  24     |> Enum.filter(fn recipient ->
  25       case User.get_cached_by_ap_id(recipient) do
  26         nil ->
  27           true
  28
  29         user ->
  30           User.following?(user, actor)
  31       end
  32     end)
  33
  34     {recipients, to, cc}
  35   end
  36
  37   defp get_recipients(data) do
  38     to = data["to"] || []
  39     cc = data["cc"] || []
  40     recipients = to ++ cc
  41     {recipients, to, cc}
  42   end
  43
  44   defp check_actor_is_active(actor) do
  45     if not is_nil(actor) do
  46       with user <- User.get_cached_by_ap_id(actor),
  47            nil <- user.info["deactivated"] do
  48         :ok
  49       else
  50         _e -> :reject
  51       end
  52     else
  53       :ok
  54     end
  55   end
  56
  57   def insert(map, local \\ true) when is_map(map) do
  58     with nil <- Activity.normalize(map),
  59          map <- lazy_put_activity_defaults(map),
  60          :ok <- check_actor_is_active(map["actor"]),
  61          {:ok, map} <- MRF.filter(map),
  62          :ok <- insert_full_object(map) do
  63       {recipients, recipients_to, recipients_cc} = get_recipients(map)
  64
  65       {:ok, activity} =
  66         Repo.insert(%Activity{
  67           data: map,
  68           local: local,
  69           actor: map["actor"],
  70           recipients: recipients,
  71           recipients_to: recipients_to,
  72           recipients_cc: recipients_cc
  73         })
  74
  75       Notification.create_notifications(activity)
  76       stream_out(activity)
  77       {:ok, activity}
  78     else
  79       %Activity{} = activity -> {:ok, activity}
  80       error -> {:error, error}
  81     end
  82   end
  83
  84   def stream_out(activity) do
  85     public = "https://www.w3.org/ns/activitystreams#Public"
  86
  87     if activity.data["type"] in ["Create", "Announce"] do
  88       Pleroma.Web.Streamer.stream("user", activity)
  89       Pleroma.Web.Streamer.stream("list", activity)
  90
  91       if Enum.member?(activity.data["to"], public) do
  92         Pleroma.Web.Streamer.stream("public", activity)
  93
  94         if activity.local do
  95           Pleroma.Web.Streamer.stream("public:local", activity)
  96         end
  97
  98         if activity.data["object"]["attachment"] != [] do
  99           Pleroma.Web.Streamer.stream("public:media", activity)
 100
 101           if activity.local do
 102             Pleroma.Web.Streamer.stream("public:local:media", activity)
 103           end
 104         end
 105       else
 106         if !Enum.member?(activity.data["cc"] || [], public) &&
 107              !Enum.member?(
 108                activity.data["to"],
 109                User.get_by_ap_id(activity.data["actor"]).follower_address
 110              ),
 111            do: Pleroma.Web.Streamer.stream("direct", activity)
 112       end
 113     end
 114   end
 115
 116   def create(%{to: to, actor: actor, context: context, object: object} = params) do
 117     additional = params[:additional] || %{}
 118     # only accept false as false value
 119     local = !(params[:local] == false)
 120     published = params[:published]
 121
 122     with create_data <-
 123            make_create_data(
 124              %{to: to, actor: actor, published: published, context: context, object: object},
 125              additional
 126            ),
 127          {:ok, activity} <- insert(create_data, local),
 128          :ok <- maybe_federate(activity),
 129          {:ok, _actor} <- User.increase_note_count(actor) do
 130       {:ok, activity}
 131     end
 132   end
 133
 134   def accept(%{to: to, actor: actor, object: object} = params) do
 135     # only accept false as false value
 136     local = !(params[:local] == false)
 137
 138     with data <- %{"to" => to, "type" => "Accept", "actor" => actor, "object" => object},
 139          {:ok, activity} <- insert(data, local),
 140          :ok <- maybe_federate(activity) do
 141       {:ok, activity}
 142     end
 143   end
 144
 145   def reject(%{to: to, actor: actor, object: object} = params) do
 146     # only accept false as false value
 147     local = !(params[:local] == false)
 148
 149     with data <- %{"to" => to, "type" => "Reject", "actor" => actor, "object" => object},
 150          {:ok, activity} <- insert(data, local),
 151          :ok <- maybe_federate(activity) do
 152       {:ok, activity}
 153     end
 154   end
 155
 156   def update(%{to: to, cc: cc, actor: actor, object: object} = params) do
 157     # only accept false as false value
 158     local = !(params[:local] == false)
 159
 160     with data <- %{
 161            "to" => to,
 162            "cc" => cc,
 163            "type" => "Update",
 164            "actor" => actor,
 165            "object" => object
 166          },
 167          {:ok, activity} <- insert(data, local),
 168          :ok <- maybe_federate(activity) do
 169       {:ok, activity}
 170     end
 171   end
 172
 173   # TODO: This is weird, maybe we shouldn't check here if we can make the activity.
 174   def like(
 175         %User{ap_id: ap_id} = user,
 176         %Object{data: %{"id" => _}} = object,
 177         activity_id \\ nil,
 178         local \\ true
 179       ) do
 180     with nil <- get_existing_like(ap_id, object),
 181          like_data <- make_like_data(user, object, activity_id),
 182          {:ok, activity} <- insert(like_data, local),
 183          {:ok, object} <- add_like_to_object(activity, object),
 184          :ok <- maybe_federate(activity) do
 185       {:ok, activity, object}
 186     else
 187       %Activity{} = activity -> {:ok, activity, object}
 188       error -> {:error, error}
 189     end
 190   end
 191
 192   def unlike(
 193         %User{} = actor,
 194         %Object{} = object,
 195         activity_id \\ nil,
 196         local \\ true
 197       ) do
 198     with %Activity{} = like_activity <- get_existing_like(actor.ap_id, object),
 199          unlike_data <- make_unlike_data(actor, like_activity, activity_id),
 200          {:ok, unlike_activity} <- insert(unlike_data, local),
 201          {:ok, _activity} <- Repo.delete(like_activity),
 202          {:ok, object} <- remove_like_from_object(like_activity, object),
 203          :ok <- maybe_federate(unlike_activity) do
 204       {:ok, unlike_activity, like_activity, object}
 205     else
 206       _e -> {:ok, object}
 207     end
 208   end
 209
 210   def announce(
 211         %User{ap_id: _} = user,
 212         %Object{data: %{"id" => _}} = object,
 213         activity_id \\ nil,
 214         local \\ true
 215       ) do
 216     with true <- is_public?(object),
 217          announce_data <- make_announce_data(user, object, activity_id),
 218          {:ok, activity} <- insert(announce_data, local),
 219          {:ok, object} <- add_announce_to_object(activity, object),
 220          :ok <- maybe_federate(activity) do
 221       {:ok, activity, object}
 222     else
 223       error -> {:error, error}
 224     end
 225   end
 226
 227   def unannounce(
 228         %User{} = actor,
 229         %Object{} = object,
 230         activity_id \\ nil,
 231         local \\ true
 232       ) do
 233     with %Activity{} = announce_activity <- get_existing_announce(actor.ap_id, object),
 234          unannounce_data <- make_unannounce_data(actor, announce_activity, activity_id),
 235          {:ok, unannounce_activity} <- insert(unannounce_data, local),
 236          :ok <- maybe_federate(unannounce_activity),
 237          {:ok, _activity} <- Repo.delete(announce_activity),
 238          {:ok, object} <- remove_announce_from_object(announce_activity, object) do
 239       {:ok, unannounce_activity, object}
 240     else
 241       _e -> {:ok, object}
 242     end
 243   end
 244
 245   def follow(follower, followed, activity_id \\ nil, local \\ true) do
 246     with data <- make_follow_data(follower, followed, activity_id),
 247          {:ok, activity} <- insert(data, local),
 248          :ok <- maybe_federate(activity) do
 249       {:ok, activity}
 250     end
 251   end
 252
 253   def unfollow(follower, followed, activity_id \\ nil, local \\ true) do
 254     with %Activity{} = follow_activity <- fetch_latest_follow(follower, followed),
 255          {:ok, follow_activity} <- update_follow_state(follow_activity, "cancelled"),
 256          unfollow_data <- make_unfollow_data(follower, followed, follow_activity, activity_id),
 257          {:ok, activity} <- insert(unfollow_data, local),
 258          :ok <- maybe_federate(activity) do
 259       {:ok, activity}
 260     end
 261   end
 262
 263   def delete(%Object{data: %{"id" => id, "actor" => actor}} = object, local \\ true) do
 264     user = User.get_cached_by_ap_id(actor)
 265
 266     data = %{
 267       "type" => "Delete",
 268       "actor" => actor,
 269       "object" => id,
 270       "to" => [user.follower_address, "https://www.w3.org/ns/activitystreams#Public"]
 271     }
 272
 273     with Repo.delete(object),
 274          Repo.delete_all(Activity.all_non_create_by_object_ap_id_q(id)),
 275          {:ok, activity} <- insert(data, local),
 276          :ok <- maybe_federate(activity),
 277          {:ok, _actor} <- User.decrease_note_count(user) do
 278       {:ok, activity}
 279     end
 280   end
 281
 282   def block(blocker, blocked, activity_id \\ nil, local \\ true) do
 283     ap_config = Application.get_env(:pleroma, :activitypub)
 284     unfollow_blocked = Keyword.get(ap_config, :unfollow_blocked)
 285     outgoing_blocks = Keyword.get(ap_config, :outgoing_blocks)
 286
 287     with true <- unfollow_blocked do
 288       follow_activity = fetch_latest_follow(blocker, blocked)
 289
 290       if follow_activity do
 291         unfollow(blocker, blocked, nil, local)
 292       end
 293     end
 294
 295     with true <- outgoing_blocks,
 296          block_data <- make_block_data(blocker, blocked, activity_id),
 297          {:ok, activity} <- insert(block_data, local),
 298          :ok <- maybe_federate(activity) do
 299       {:ok, activity}
 300     else
 301       _e -> {:ok, nil}
 302     end
 303   end
 304
 305   def unblock(blocker, blocked, activity_id \\ nil, local \\ true) do
 306     with %Activity{} = block_activity <- fetch_latest_block(blocker, blocked),
 307          unblock_data <- make_unblock_data(blocker, blocked, block_activity, activity_id),
 308          {:ok, activity} <- insert(unblock_data, local),
 309          :ok <- maybe_federate(activity) do
 310       {:ok, activity}
 311     end
 312   end
 313
 314   def fetch_activities_for_context(context, opts \\ %{}) do
 315     public = ["https://www.w3.org/ns/activitystreams#Public"]
 316
 317     recipients =
 318       if opts["user"], do: [opts["user"].ap_id | opts["user"].following] ++ public, else: public
 319
 320     query = from(activity in Activity)
 321
 322     query =
 323       query
 324       |> restrict_blocked(opts)
 325       |> restrict_recipients(recipients, opts["user"])
 326
 327     query =
 328       from(
 329         activity in query,
 330         where:
 331           fragment(
 332             "?->>'type' = ? and ?->>'context' = ?",
 333             activity.data,
 334             "Create",
 335             activity.data,
 336             ^context
 337           ),
 338         order_by: [desc: :id]
 339       )
 340
 341     Repo.all(query)
 342   end
 343
 344   def fetch_public_activities(opts \\ %{}) do
 345     q = fetch_activities_query(["https://www.w3.org/ns/activitystreams#Public"], opts)
 346
 347     q
 348     |> restrict_unlisted()
 349     |> Repo.all()
 350     |> Enum.reverse()
 351   end
 352
 353   @valid_visibilities ~w[direct unlisted public private]
 354
 355   defp restrict_visibility(query, %{visibility: "direct"}) do
 356     public = "https://www.w3.org/ns/activitystreams#Public"
 357
 358     from(
 359       activity in query,
 360       join: sender in User,
 361       on: sender.ap_id == activity.actor,
 362       # Are non-direct statuses with no to/cc possible?
 363       where:
 364         fragment(
 365           "not (? && ?)",
 366           [^public, sender.follower_address],
 367           activity.recipients
 368         )
 369     )
 370   end
 371
 372   defp restrict_visibility(_query, %{visibility: visibility})
 373        when visibility not in @valid_visibilities do
 374     Logger.error("Could not restrict visibility to #{visibility}")
 375   end
 376
 377   defp restrict_visibility(query, _visibility), do: query
 378
 379   def fetch_user_activities(user, reading_user, params \\ %{}) do
 380     params =
 381       params
 382       |> Map.put("type", ["Create", "Announce"])
 383       |> Map.put("actor_id", user.ap_id)
 384       |> Map.put("whole_db", true)
 385
 386     recipients =
 387       if reading_user do
 388         ["https://www.w3.org/ns/activitystreams#Public"] ++
 389           [reading_user.ap_id | reading_user.following]
 390       else
 391         ["https://www.w3.org/ns/activitystreams#Public"]
 392       end
 393
 394     fetch_activities(recipients, params)
 395     |> Enum.reverse()
 396   end
 397
 398   defp restrict_since(query, %{"since_id" => since_id}) do
 399     from(activity in query, where: activity.id > ^since_id)
 400   end
 401
 402   defp restrict_since(query, _), do: query
 403
 404   defp restrict_tag(query, %{"tag" => tag}) do
 405     from(
 406       activity in query,
 407       where: fragment("? <@ (? #> '{\"object\",\"tag\"}')", ^tag, activity.data)
 408     )
 409   end
 410
 411   defp restrict_tag(query, _), do: query
 412
 413   defp restrict_recipients(query, [], _user), do: query
 414
 415   defp restrict_recipients(query, recipients, nil) do
 416     from(activity in query, where: fragment("? && ?", ^recipients, activity.recipients))
 417   end
 418
 419   defp restrict_recipients(query, recipients, user) do
 420     from(
 421       activity in query,
 422       where: fragment("? && ?", ^recipients, activity.recipients),
 423       or_where: activity.actor == ^user.ap_id
 424     )
 425   end
 426
 427   defp restrict_limit(query, %{"limit" => limit}) do
 428     from(activity in query, limit: ^limit)
 429   end
 430
 431   defp restrict_limit(query, _), do: query
 432
 433   defp restrict_local(query, %{"local_only" => true}) do
 434     from(activity in query, where: activity.local == true)
 435   end
 436
 437   defp restrict_local(query, _), do: query
 438
 439   defp restrict_max(query, %{"max_id" => max_id}) do
 440     from(activity in query, where: activity.id < ^max_id)
 441   end
 442
 443   defp restrict_max(query, _), do: query
 444
 445   defp restrict_actor(query, %{"actor_id" => actor_id}) do
 446     from(activity in query, where: activity.actor == ^actor_id)
 447   end
 448
 449   defp restrict_actor(query, _), do: query
 450
 451   defp restrict_type(query, %{"type" => type}) when is_binary(type) do
 452     restrict_type(query, %{"type" => [type]})
 453   end
 454
 455   defp restrict_type(query, %{"type" => type}) do
 456     from(activity in query, where: fragment("?->>'type' = ANY(?)", activity.data, ^type))
 457   end
 458
 459   defp restrict_type(query, _), do: query
 460
 461   defp restrict_favorited_by(query, %{"favorited_by" => ap_id}) do
 462     from(
 463       activity in query,
 464       where: fragment("? <@ (? #> '{\"object\",\"likes\"}')", ^ap_id, activity.data)
 465     )
 466   end
 467
 468   defp restrict_favorited_by(query, _), do: query
 469
 470   defp restrict_media(query, %{"only_media" => val}) when val == "true" or val == "1" do
 471     from(
 472       activity in query,
 473       where: fragment("not (? #> '{\"object\",\"attachment\"}' = ?)", activity.data, ^[])
 474     )
 475   end
 476
 477   defp restrict_media(query, _), do: query
 478
 479   defp restrict_replies(query, %{"exclude_replies" => val}) when val == "true" or val == "1" do
 480     from(
 481       activity in query,
 482       where: fragment("?->'object'->>'inReplyTo' is null", activity.data)
 483     )
 484   end
 485
 486   defp restrict_replies(query, _), do: query
 487
 488   # Only search through last 100_000 activities by default
 489   defp restrict_recent(query, %{"whole_db" => true}), do: query
 490
 491   defp restrict_recent(query, _) do
 492     since = (Repo.aggregate(Activity, :max, :id) || 0) - 100_000
 493
 494     from(activity in query, where: activity.id > ^since)
 495   end
 496
 497   defp restrict_blocked(query, %{"blocking_user" => %User{info: info}}) do
 498     blocks = info["blocks"] || []
 499     domain_blocks = info["domain_blocks"] || []
 500
 501     from(
 502       activity in query,
 503       where: fragment("not (? = ANY(?))", activity.actor, ^blocks),
 504       where: fragment("not (?->'to' \\?| ?)", activity.data, ^blocks),
 505       where: fragment("not (split_part(?, '/', 3) = ANY(?))", activity.actor, ^domain_blocks)
 506     )
 507   end
 508
 509   defp restrict_blocked(query, _), do: query
 510
 511   defp restrict_unlisted(query) do
 512     from(
 513       activity in query,
 514       where:
 515         fragment(
 516           "not (coalesce(?->'cc', '{}'::jsonb) \\?| ?)",
 517           activity.data,
 518           ^["https://www.w3.org/ns/activitystreams#Public"]
 519         )
 520     )
 521   end
 522
 523   def fetch_activities_query(recipients, opts \\ %{}) do
 524     base_query =
 525       from(
 526         activity in Activity,
 527         limit: 20,
 528         order_by: [fragment("? desc nulls last", activity.id)]
 529       )
 530
 531     base_query
 532     |> restrict_recipients(recipients, opts["user"])
 533     |> restrict_tag(opts)
 534     |> restrict_since(opts)
 535     |> restrict_local(opts)
 536     |> restrict_limit(opts)
 537     |> restrict_max(opts)
 538     |> restrict_actor(opts)
 539     |> restrict_type(opts)
 540     |> restrict_favorited_by(opts)
 541     |> restrict_recent(opts)
 542     |> restrict_blocked(opts)
 543     |> restrict_media(opts)
 544     |> restrict_visibility(opts)
 545     |> restrict_replies(opts)
 546   end
 547
 548   def fetch_activities(recipients, opts \\ %{}) do
 549     fetch_activities_query(recipients, opts)
 550     |> Repo.all()
 551     |> Enum.reverse()
 552   end
 553
 554   def upload(file) do
 555     data = Upload.store(file, Application.get_env(:pleroma, :instance)[:dedupe_media])
 556     Repo.insert(%Object{data: data})
 557   end
 558
 559   def user_data_from_user_object(data) do
 560     avatar =
 561       data["icon"]["url"] &&
 562         %{
 563           "type" => "Image",
 564           "url" => [%{"href" => data["icon"]["url"]}]
 565         }
 566
 567     banner =
 568       data["image"]["url"] &&
 569         %{
 570           "type" => "Image",
 571           "url" => [%{"href" => data["image"]["url"]}]
 572         }
 573
 574     locked = data["manuallyApprovesFollowers"] || false
 575     data = Transmogrifier.maybe_fix_user_object(data)
 576
 577     user_data = %{
 578       ap_id: data["id"],
 579       info: %{
 580         "ap_enabled" => true,
 581         "source_data" => data,
 582         "banner" => banner,
 583         "locked" => locked
 584       },
 585       avatar: avatar,
 586       name: data["name"],
 587       follower_address: data["followers"],
 588       bio: data["summary"]
 589     }
 590
 591     # nickname can be nil because of virtual actors
 592     user_data =
 593       if data["preferredUsername"] do
 594         Map.put(
 595           user_data,
 596           :nickname,
 597           "#{data["preferredUsername"]}@#{URI.parse(data["id"]).host}"
 598         )
 599       else
 600         Map.put(user_data, :nickname, nil)
 601       end
 602
 603     {:ok, user_data}
 604   end
 605
 606   def fetch_and_prepare_user_from_ap_id(ap_id) do
 607     with {:ok, %{status_code: 200, body: body}} <-
 608            @httpoison.get(ap_id, [Accept: "application/activity+json"], follow_redirect: true),
 609          {:ok, data} <- Jason.decode(body) do
 610       user_data_from_user_object(data)
 611     else
 612       e -> Logger.error("Could not decode user at fetch #{ap_id}, #{inspect(e)}")
 613     end
 614   end
 615
 616   def make_user_from_ap_id(ap_id) do
 617     if _user = User.get_by_ap_id(ap_id) do
 618       Transmogrifier.upgrade_user_from_ap_id(ap_id)
 619     else
 620       with {:ok, data} <- fetch_and_prepare_user_from_ap_id(ap_id) do
 621         User.insert_or_update_user(data)
 622       else
 623         e -> {:error, e}
 624       end
 625     end
 626   end
 627
 628   def make_user_from_nickname(nickname) do
 629     with {:ok, %{"ap_id" => ap_id}} when not is_nil(ap_id) <- WebFinger.finger(nickname) do
 630       make_user_from_ap_id(ap_id)
 631     else
 632       _e -> {:error, "No AP id in WebFinger"}
 633     end
 634   end
 635
 636   @quarantined_instances Keyword.get(@instance, :quarantined_instances, [])
 637
 638   def should_federate?(inbox, public) do
 639     if public do
 640       true
 641     else
 642       inbox_info = URI.parse(inbox)
 643       inbox_info.host not in @quarantined_instances
 644     end
 645   end
 646
 647   def publish(actor, activity) do
 648     followers =
 649       if actor.follower_address in activity.recipients do
 650         {:ok, followers} = User.get_followers(actor)
 651         followers |> Enum.filter(&(!&1.local))
 652       else
 653         []
 654       end
 655
 656     public = is_public?(activity)
 657
 658     remote_inboxes =
 659       (Pleroma.Web.Salmon.remote_users(activity) ++ followers)
 660       |> Enum.filter(fn user -> User.ap_enabled?(user) end)
 661       |> Enum.map(fn %{info: %{"source_data" => data}} ->
 662         (data["endpoints"] && data["endpoints"]["sharedInbox"]) || data["inbox"]
 663       end)
 664       |> Enum.uniq()
 665       |> Enum.filter(fn inbox -> should_federate?(inbox, public) end)
 666
 667     {:ok, data} = Transmogrifier.prepare_outgoing(activity.data)
 668     json = Jason.encode!(data)
 669
 670     Enum.each(remote_inboxes, fn inbox ->
 671       Federator.enqueue(:publish_single_ap, %{
 672         inbox: inbox,
 673         json: json,
 674         actor: actor,
 675         id: activity.data["id"]
 676       })
 677     end)
 678   end
 679
 680   def publish_one(%{inbox: inbox, json: json, actor: actor, id: id}) do
 681     Logger.info("Federating #{id} to #{inbox}")
 682     host = URI.parse(inbox).host
 683
 684     digest = "SHA-256=" <> (:crypto.hash(:sha256, json) |> Base.encode64())
 685
 686     signature =
 687       Pleroma.Web.HTTPSignatures.sign(actor, %{
 688         host: host,
 689         "content-length": byte_size(json),
 690         digest: digest
 691       })
 692
 693     @httpoison.post(
 694       inbox,
 695       json,
 696       [
 697         {"Content-Type", "application/activity+json"},
 698         {"signature", signature},
 699         {"digest", digest}
 700       ],
 701       hackney: [pool: :default]
 702     )
 703   end
 704
 705   # TODO:
 706   # This will create a Create activity, which we need internally at the moment.
 707   def fetch_object_from_id(id) do
 708     if object = Object.get_cached_by_ap_id(id) do
 709       {:ok, object}
 710     else
 711       Logger.info("Fetching #{id} via AP")
 712
 713       with true <- String.starts_with?(id, "http"),
 714            {:ok, %{body: body, status_code: code}} when code in 200..299 <-
 715              @httpoison.get(
 716                id,
 717                [Accept: "application/activity+json"],
 718                follow_redirect: true,
 719                timeout: 10000,
 720                recv_timeout: 20000
 721              ),
 722            {:ok, data} <- Jason.decode(body),
 723            nil <- Object.normalize(data),
 724            params <- %{
 725              "type" => "Create",
 726              "to" => data["to"],
 727              "cc" => data["cc"],
 728              "actor" => data["attributedTo"],
 729              "object" => data
 730            },
 731            {:ok, activity} <- Transmogrifier.handle_incoming(params) do
 732         {:ok, Object.normalize(activity.data["object"])}
 733       else
 734         object = %Object{} ->
 735           {:ok, object}
 736
 737         _e ->
 738           Logger.info("Couldn't get object via AP, trying out OStatus fetching...")
 739
 740           case OStatus.fetch_activity_from_url(id) do
 741             {:ok, [activity | _]} -> {:ok, Object.normalize(activity.data["object"])}
 742             e -> e
 743           end
 744       end
 745     end
 746   end
 747
 748   def is_public?(activity) do
 749     "https://www.w3.org/ns/activitystreams#Public" in (activity.data["to"] ++
 750                                                          (activity.data["cc"] || []))
 751   end
 752
 753   def visible_for_user?(activity, nil) do
 754     is_public?(activity)
 755   end
 756
 757   def visible_for_user?(activity, user) do
 758     x = [user.ap_id | user.following]
 759     y = activity.data["to"] ++ (activity.data["cc"] || [])
 760     visible_for_user?(activity, nil) || Enum.any?(x, &(&1 in y))
 761   end
 762 end