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