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   def insert(map, local \\ true) when is_map(map) do
  20     with nil <- Activity.get_by_ap_id(map["id"]),
  21          map <- lazy_put_activity_defaults(map),
  22          {:ok, map} <- MRF.filter(map),
  23          :ok <- insert_full_object(map) do
  24       {:ok, activity} =
  25         Repo.insert(%Activity{
  26           data: map,
  27           local: local,
  28           actor: map["actor"],
  29           recipients: get_recipients(map)
  30         })
  31
  32       Notification.create_notifications(activity)
  33       stream_out(activity)
  34       {:ok, activity}
  35     else
  36       %Activity{} = activity -> {:ok, activity}
  37       error -> {:error, error}
  38     end
  39   end
  40
  41   def stream_out(activity) do
  42     if activity.data["type"] in ["Create", "Announce"] do
  43       Pleroma.Web.Streamer.stream("user", activity)
  44
  45       if Enum.member?(activity.data["to"], "https://www.w3.org/ns/activitystreams#Public") do
  46         Pleroma.Web.Streamer.stream("public", activity)
  47
  48         if activity.local do
  49           Pleroma.Web.Streamer.stream("public:local", activity)
  50         end
  51       end
  52     end
  53   end
  54
  55   def create(%{to: to, actor: actor, context: context, object: object} = params) do
  56     additional = params[:additional] || %{}
  57     # only accept false as false value
  58     local = !(params[:local] == false)
  59     published = params[:published]
  60
  61     with create_data <-
  62            make_create_data(
  63              %{to: to, actor: actor, published: published, context: context, object: object},
  64              additional
  65            ),
  66          {:ok, activity} <- insert(create_data, local),
  67          :ok <- maybe_federate(activity),
  68          {:ok, _actor} <- User.increase_note_count(actor) do
  69       {:ok, activity}
  70     end
  71   end
  72
  73   def accept(%{to: to, actor: actor, object: object} = params) do
  74     # only accept false as false value
  75     local = !(params[:local] == false)
  76
  77     with data <- %{"to" => to, "type" => "Accept", "actor" => actor, "object" => object},
  78          {:ok, activity} <- insert(data, local),
  79          :ok <- maybe_federate(activity) do
  80       {:ok, activity}
  81     end
  82   end
  83
  84   def update(%{to: to, cc: cc, actor: actor, object: object} = params) do
  85     # only accept false as false value
  86     local = !(params[:local] == false)
  87
  88     with data <- %{
  89            "to" => to,
  90            "cc" => cc,
  91            "type" => "Update",
  92            "actor" => actor,
  93            "object" => object
  94          },
  95          {:ok, activity} <- insert(data, local),
  96          :ok <- maybe_federate(activity) do
  97       {:ok, activity}
  98     end
  99   end
 100
 101   # TODO: This is weird, maybe we shouldn't check here if we can make the activity.
 102   def like(
 103         %User{ap_id: ap_id} = user,
 104         %Object{data: %{"id" => _}} = object,
 105         activity_id \\ nil,
 106         local \\ true
 107       ) do
 108     with nil <- get_existing_like(ap_id, object),
 109          like_data <- make_like_data(user, object, activity_id),
 110          {:ok, activity} <- insert(like_data, local),
 111          {:ok, object} <- add_like_to_object(activity, object),
 112          :ok <- maybe_federate(activity) do
 113       {:ok, activity, object}
 114     else
 115       %Activity{} = activity -> {:ok, activity, object}
 116       error -> {:error, error}
 117     end
 118   end
 119
 120   def unlike(%User{} = actor, %Object{} = object) do
 121     with %Activity{} = activity <- get_existing_like(actor.ap_id, object),
 122          {:ok, _activity} <- Repo.delete(activity),
 123          {:ok, object} <- remove_like_from_object(activity, object) do
 124       {:ok, object}
 125     else
 126       _e -> {:ok, object}
 127     end
 128   end
 129
 130   def announce(
 131         %User{ap_id: _} = user,
 132         %Object{data: %{"id" => _}} = object,
 133         activity_id \\ nil,
 134         local \\ true
 135       ) do
 136     with true <- is_public?(object),
 137          announce_data <- make_announce_data(user, object, activity_id),
 138          {:ok, activity} <- insert(announce_data, local),
 139          {:ok, object} <- add_announce_to_object(activity, object),
 140          :ok <- maybe_federate(activity) do
 141       {:ok, activity, object}
 142     else
 143       error -> {:error, error}
 144     end
 145   end
 146
 147   def follow(follower, followed, activity_id \\ nil, local \\ true) do
 148     with data <- make_follow_data(follower, followed, activity_id),
 149          {:ok, activity} <- insert(data, local),
 150          :ok <- maybe_federate(activity) do
 151       {:ok, activity}
 152     end
 153   end
 154
 155   def unfollow(follower, followed, local \\ true) do
 156     with %Activity{} = follow_activity <- fetch_latest_follow(follower, followed),
 157          unfollow_data <- make_unfollow_data(follower, followed, follow_activity),
 158          {:ok, activity} <- insert(unfollow_data, local),
 159          :ok,
 160          maybe_federate(activity) do
 161       {:ok, activity}
 162     end
 163   end
 164
 165   def delete(%Object{data: %{"id" => id, "actor" => actor}} = object, local \\ true) do
 166     user = User.get_cached_by_ap_id(actor)
 167
 168     data = %{
 169       "type" => "Delete",
 170       "actor" => actor,
 171       "object" => id,
 172       "to" => [user.follower_address, "https://www.w3.org/ns/activitystreams#Public"]
 173     }
 174
 175     with Repo.delete(object),
 176          Repo.delete_all(Activity.all_non_create_by_object_ap_id_q(id)),
 177          {:ok, activity} <- insert(data, local),
 178          :ok <- maybe_federate(activity),
 179          {:ok, _actor} <- User.decrease_note_count(user) do
 180       {:ok, activity}
 181     end
 182   end
 183
 184   def fetch_activities_for_context(context, opts \\ %{}) do
 185     public = ["https://www.w3.org/ns/activitystreams#Public"]
 186
 187     recipients =
 188       if opts["user"], do: [opts["user"].ap_id | opts["user"].following] ++ public, else: public
 189
 190     query = from(activity in Activity)
 191
 192     query =
 193       query
 194       |> restrict_blocked(opts)
 195       |> restrict_recipients(recipients, opts["user"])
 196
 197     query =
 198       from(
 199         activity in query,
 200         where:
 201           fragment(
 202             "?->>'type' = ? and ?->>'context' = ?",
 203             activity.data,
 204             "Create",
 205             activity.data,
 206             ^context
 207           ),
 208         order_by: [desc: :id]
 209       )
 210
 211     Repo.all(query)
 212   end
 213
 214   # TODO: Make this work properly with unlisted.
 215   def fetch_public_activities(opts \\ %{}) do
 216     q = fetch_activities_query(["https://www.w3.org/ns/activitystreams#Public"], opts)
 217
 218     q
 219     |> Repo.all()
 220     |> Enum.reverse()
 221   end
 222
 223   defp restrict_since(query, %{"since_id" => since_id}) do
 224     from(activity in query, where: activity.id > ^since_id)
 225   end
 226
 227   defp restrict_since(query, _), do: query
 228
 229   defp restrict_tag(query, %{"tag" => tag}) do
 230     from(
 231       activity in query,
 232       where: fragment("? <@ (? #> '{\"object\",\"tag\"}')", ^tag, activity.data)
 233     )
 234   end
 235
 236   defp restrict_tag(query, _), do: query
 237
 238   defp restrict_recipients(query, [], _user), do: query
 239
 240   defp restrict_recipients(query, recipients, nil) do
 241     from(activity in query, where: fragment("? && ?", ^recipients, activity.recipients))
 242   end
 243
 244   defp restrict_recipients(query, recipients, user) do
 245     from(
 246       activity in query,
 247       where: fragment("? && ?", ^recipients, activity.recipients),
 248       or_where: activity.actor == ^user.ap_id
 249     )
 250   end
 251
 252   defp restrict_limit(query, %{"limit" => limit}) do
 253     from(activity in query, limit: ^limit)
 254   end
 255
 256   defp restrict_limit(query, _), do: query
 257
 258   defp restrict_local(query, %{"local_only" => true}) do
 259     from(activity in query, where: activity.local == true)
 260   end
 261
 262   defp restrict_local(query, _), do: query
 263
 264   defp restrict_max(query, %{"max_id" => max_id}) do
 265     from(activity in query, where: activity.id < ^max_id)
 266   end
 267
 268   defp restrict_max(query, _), do: query
 269
 270   defp restrict_actor(query, %{"actor_id" => actor_id}) do
 271     from(activity in query, where: activity.actor == ^actor_id)
 272   end
 273
 274   defp restrict_actor(query, _), do: query
 275
 276   defp restrict_type(query, %{"type" => type}) when is_binary(type) do
 277     restrict_type(query, %{"type" => [type]})
 278   end
 279
 280   defp restrict_type(query, %{"type" => type}) do
 281     from(activity in query, where: fragment("?->>'type' = ANY(?)", activity.data, ^type))
 282   end
 283
 284   defp restrict_type(query, _), do: query
 285
 286   defp restrict_favorited_by(query, %{"favorited_by" => ap_id}) do
 287     from(
 288       activity in query,
 289       where: fragment("? <@ (? #> '{\"object\",\"likes\"}')", ^ap_id, activity.data)
 290     )
 291   end
 292
 293   defp restrict_favorited_by(query, _), do: query
 294
 295   defp restrict_media(query, %{"only_media" => val}) when val == "true" or val == "1" do
 296     from(
 297       activity in query,
 298       where: fragment("not (? #> '{\"object\",\"attachment\"}' = ?)", activity.data, ^[])
 299     )
 300   end
 301
 302   defp restrict_media(query, _), do: query
 303
 304   # Only search through last 100_000 activities by default
 305   defp restrict_recent(query, %{"whole_db" => true}), do: query
 306
 307   defp restrict_recent(query, _) do
 308     since = (Repo.aggregate(Activity, :max, :id) || 0) - 100_000
 309
 310     from(activity in query, where: activity.id > ^since)
 311   end
 312
 313   defp restrict_blocked(query, %{"blocking_user" => %User{info: info}}) do
 314     blocks = info["blocks"] || []
 315
 316     from(
 317       activity in query,
 318       where: fragment("not (? = ANY(?))", activity.actor, ^blocks),
 319       where: fragment("not (?->'to' \\?| ?)", activity.data, ^blocks)
 320     )
 321   end
 322
 323   defp restrict_blocked(query, _), do: query
 324
 325   def fetch_activities_query(recipients, opts \\ %{}) do
 326     base_query =
 327       from(
 328         activity in Activity,
 329         limit: 20,
 330         order_by: [fragment("? desc nulls last", activity.id)]
 331       )
 332
 333     base_query
 334     |> restrict_recipients(recipients, opts["user"])
 335     |> restrict_tag(opts)
 336     |> restrict_since(opts)
 337     |> restrict_local(opts)
 338     |> restrict_limit(opts)
 339     |> restrict_max(opts)
 340     |> restrict_actor(opts)
 341     |> restrict_type(opts)
 342     |> restrict_favorited_by(opts)
 343     |> restrict_recent(opts)
 344     |> restrict_blocked(opts)
 345     |> restrict_media(opts)
 346   end
 347
 348   def fetch_activities(recipients, opts \\ %{}) do
 349     fetch_activities_query(recipients, opts)
 350     |> Repo.all()
 351     |> Enum.reverse()
 352   end
 353
 354   def upload(file) do
 355     data = Upload.store(file)
 356     Repo.insert(%Object{data: data})
 357   end
 358
 359   def user_data_from_user_object(data) do
 360     avatar =
 361       data["icon"]["url"] &&
 362         %{
 363           "type" => "Image",
 364           "url" => [%{"href" => data["icon"]["url"]}]
 365         }
 366
 367     banner =
 368       data["image"]["url"] &&
 369         %{
 370           "type" => "Image",
 371           "url" => [%{"href" => data["image"]["url"]}]
 372         }
 373
 374     user_data = %{
 375       ap_id: data["id"],
 376       info: %{
 377         "ap_enabled" => true,
 378         "source_data" => data,
 379         "banner" => banner
 380       },
 381       avatar: avatar,
 382       nickname: "#{data["preferredUsername"]}@#{URI.parse(data["id"]).host}",
 383       name: data["name"],
 384       follower_address: data["followers"],
 385       bio: data["summary"]
 386     }
 387
 388     {:ok, user_data}
 389   end
 390
 391   def fetch_and_prepare_user_from_ap_id(ap_id) do
 392     with {:ok, %{status_code: 200, body: body}} <-
 393            @httpoison.get(ap_id, Accept: "application/activity+json"),
 394          {:ok, data} <- Jason.decode(body) do
 395       user_data_from_user_object(data)
 396     else
 397       e -> Logger.error("Could not decode user at fetch #{ap_id}, #{inspect(e)}")
 398     end
 399   end
 400
 401   def make_user_from_ap_id(ap_id) do
 402     if _user = User.get_by_ap_id(ap_id) do
 403       Transmogrifier.upgrade_user_from_ap_id(ap_id)
 404     else
 405       with {:ok, data} <- fetch_and_prepare_user_from_ap_id(ap_id) do
 406         User.insert_or_update_user(data)
 407       else
 408         e -> {:error, e}
 409       end
 410     end
 411   end
 412
 413   def make_user_from_nickname(nickname) do
 414     with {:ok, %{"ap_id" => ap_id}} when not is_nil(ap_id) <- WebFinger.finger(nickname) do
 415       make_user_from_ap_id(ap_id)
 416     else
 417       _e -> {:error, "No AP id in WebFinger"}
 418     end
 419   end
 420
 421   def publish(actor, activity) do
 422     followers =
 423       if actor.follower_address in activity.recipients do
 424         {:ok, followers} = User.get_followers(actor)
 425         followers |> Enum.filter(&(!&1.local))
 426       else
 427         []
 428       end
 429
 430     remote_inboxes =
 431       (Pleroma.Web.Salmon.remote_users(activity) ++ followers)
 432       |> Enum.filter(fn user -> User.ap_enabled?(user) end)
 433       |> Enum.map(fn %{info: %{"source_data" => data}} ->
 434         (data["endpoints"] && data["endpoints"]["sharedInbox"]) || data["inbox"]
 435       end)
 436       |> Enum.uniq()
 437
 438     {:ok, data} = Transmogrifier.prepare_outgoing(activity.data)
 439     json = Jason.encode!(data)
 440
 441     Enum.each(remote_inboxes, fn inbox ->
 442       Federator.enqueue(:publish_single_ap, %{
 443         inbox: inbox,
 444         json: json,
 445         actor: actor,
 446         id: activity.data["id"]
 447       })
 448     end)
 449   end
 450
 451   def publish_one(%{inbox: inbox, json: json, actor: actor, id: id}) do
 452     Logger.info("Federating #{id} to #{inbox}")
 453     host = URI.parse(inbox).host
 454
 455     signature =
 456       Pleroma.Web.HTTPSignatures.sign(actor, %{host: host, "content-length": byte_size(json)})
 457
 458     @httpoison.post(
 459       inbox,
 460       json,
 461       [{"Content-Type", "application/activity+json"}, {"signature", signature}],
 462       hackney: [pool: :default]
 463     )
 464   end
 465
 466   # TODO:
 467   # This will create a Create activity, which we need internally at the moment.
 468   def fetch_object_from_id(id) do
 469     if object = Object.get_cached_by_ap_id(id) do
 470       {:ok, object}
 471     else
 472       Logger.info("Fetching #{id} via AP")
 473
 474       with true <- String.starts_with?(id, "http"),
 475            {:ok, %{body: body, status_code: code}} when code in 200..299 <-
 476              @httpoison.get(
 477                id,
 478                [Accept: "application/activity+json"],
 479                follow_redirect: true,
 480                timeout: 10000,
 481                recv_timeout: 20000
 482              ),
 483            {:ok, data} <- Jason.decode(body),
 484            nil <- Object.get_by_ap_id(data["id"]),
 485            params <- %{
 486              "type" => "Create",
 487              "to" => data["to"],
 488              "cc" => data["cc"],
 489              "actor" => data["attributedTo"],
 490              "object" => data
 491            },
 492            {:ok, activity} <- Transmogrifier.handle_incoming(params) do
 493         {:ok, Object.get_by_ap_id(activity.data["object"]["id"])}
 494       else
 495         object = %Object{} ->
 496           {:ok, object}
 497
 498         _e ->
 499           Logger.info("Couldn't get object via AP, trying out OStatus fetching...")
 500
 501           case OStatus.fetch_activity_from_url(id) do
 502             {:ok, [activity | _]} -> {:ok, Object.get_by_ap_id(activity.data["object"]["id"])}
 503             e -> e
 504           end
 505       end
 506     end
 507   end
 508
 509   def is_public?(activity) do
 510     "https://www.w3.org/ns/activitystreams#Public" in (activity.data["to"] ++
 511                                                          (activity.data["cc"] || []))
 512   end
 513
 514   def visible_for_user?(activity, nil) do
 515     is_public?(activity)
 516   end
 517
 518   def visible_for_user?(activity, user) do
 519     x = [user.ap_id | user.following]
 520     y = activity.data["to"] ++ (activity.data["cc"] || [])
 521     visible_for_user?(activity, nil) || Enum.any?(x, &(&1 in y))
 522   end
 523 end