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