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
   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   @rewrite_policy Keyword.get(@instance, :rewrite_policy)
  15
  16   def get_recipients(data) do
  17     (data["to"] || []) ++ (data["cc"] || [])
  18   end
  19
  20   def insert(map, local \\ true) when is_map(map) do
  21     with nil <- Activity.get_by_ap_id(map["id"]),
  22          map <- lazy_put_activity_defaults(map),
  23          :ok <- insert_full_object(map),
  24          {:ok, map} <- @rewrite_policy.filter(map) do
  25       {:ok, activity} =
  26         Repo.insert(%Activity{
  27           data: map,
  28           local: local,
  29           actor: map["actor"],
  30           recipients: get_recipients(map)
  31         })
  32
  33       Notification.create_notifications(activity)
  34       stream_out(activity)
  35       {:ok, activity}
  36     else
  37       %Activity{} = activity -> {:ok, activity}
  38       error -> {:error, error}
  39     end
  40   end
  41
  42   def stream_out(activity) do
  43     if activity.data["type"] in ["Create", "Announce"] do
  44       Pleroma.Web.Streamer.stream("user", activity)
  45
  46       if Enum.member?(activity.data["to"], "https://www.w3.org/ns/activitystreams#Public") do
  47         Pleroma.Web.Streamer.stream("public", activity)
  48
  49         if activity.local do
  50           Pleroma.Web.Streamer.stream("public:local", activity)
  51         end
  52       end
  53     end
  54   end
  55
  56   def create(%{to: to, actor: actor, context: context, object: object} = params) do
  57     additional = params[:additional] || %{}
  58     # only accept false as false value
  59     local = !(params[:local] == false)
  60     published = params[:published]
  61
  62     with create_data <-
  63            make_create_data(
  64              %{to: to, actor: actor, published: published, context: context, object: object},
  65              additional
  66            ),
  67          {:ok, activity} <- insert(create_data, local),
  68          :ok <- maybe_federate(activity),
  69          {:ok, actor} <- User.increase_note_count(actor) do
  70       {:ok, activity}
  71     end
  72   end
  73
  74   def accept(%{to: to, actor: actor, object: object} = params) do
  75     # only accept false as false value
  76     local = !(params[:local] == false)
  77
  78     with data <- %{"to" => to, "type" => "Accept", "actor" => actor, "object" => object},
  79          {:ok, activity} <- insert(data, local),
  80          :ok <- maybe_federate(activity) do
  81       {:ok, activity}
  82     end
  83   end
  84
  85   def update(%{to: to, cc: cc, actor: actor, object: object} = params) do
  86     # only accept false as false value
  87     local = !(params[:local] == false)
  88
  89     with data <- %{
  90            "to" => to,
  91            "cc" => cc,
  92            "type" => "Update",
  93            "actor" => actor,
  94            "object" => object
  95          },
  96          {:ok, activity} <- insert(data, local),
  97          :ok <- maybe_federate(activity) do
  98       {:ok, activity}
  99     end
 100   end
 101
 102   # TODO: This is weird, maybe we shouldn't check here if we can make the activity.
 103   def like(
 104         %User{ap_id: ap_id} = user,
 105         %Object{data: %{"id" => _}} = object,
 106         activity_id \\ nil,
 107         local \\ true
 108       ) do
 109     with nil <- get_existing_like(ap_id, object),
 110          like_data <- make_like_data(user, object, activity_id),
 111          {:ok, activity} <- insert(like_data, local),
 112          {:ok, object} <- add_like_to_object(activity, object),
 113          :ok <- maybe_federate(activity) do
 114       {:ok, activity, object}
 115     else
 116       %Activity{} = activity -> {:ok, activity, object}
 117       error -> {:error, error}
 118     end
 119   end
 120
 121   def unlike(%User{} = actor, %Object{} = object) do
 122     with %Activity{} = activity <- get_existing_like(actor.ap_id, object),
 123          {:ok, _activity} <- Repo.delete(activity),
 124          {:ok, object} <- remove_like_from_object(activity, object) do
 125       {:ok, object}
 126     else
 127       _e -> {:ok, object}
 128     end
 129   end
 130
 131   def announce(
 132         %User{ap_id: _} = user,
 133         %Object{data: %{"id" => _}} = object,
 134         activity_id \\ nil,
 135         local \\ true
 136       ) do
 137     with true <- is_public?(object),
 138          announce_data <- make_announce_data(user, object, activity_id),
 139          {:ok, activity} <- insert(announce_data, local),
 140          {:ok, object} <- add_announce_to_object(activity, object),
 141          :ok <- maybe_federate(activity) do
 142       {:ok, activity, object}
 143     else
 144       error -> {:error, error}
 145     end
 146   end
 147
 148   def unannounce(
 149         %User{} = actor,
 150         %Object{} = object,
 151         local \\ true,
 152         activity_id \\ nil
 153       ) do
 154     with %Activity{} = announce_activity <- get_existing_announce(actor.ap_id, object),
 155          unannounce_data <- make_unannounce_data(actor, announce_activity, activity_id),
 156          {:ok, unannounce_activity} <- insert(unannounce_data, local),
 157          :ok <- maybe_federate(unannounce_activity),
 158          {:ok, _activity} <- Repo.delete(announce_activity),
 159          {:ok, object} <- remove_announce_from_object(announce_activity, object) do
 160       {:ok, unannounce_activity, announce_activity, object}
 161     else
 162       _e -> {:ok, object}
 163     end
 164   end
 165
 166   def follow(follower, followed, activity_id \\ nil, local \\ true) do
 167     with data <- make_follow_data(follower, followed, activity_id),
 168          {:ok, activity} <- insert(data, local),
 169          :ok <- maybe_federate(activity) do
 170       {:ok, activity}
 171     end
 172   end
 173
 174   def unfollow(follower, followed, local \\ true) do
 175     with %Activity{} = follow_activity <- fetch_latest_follow(follower, followed),
 176          unfollow_data <- make_unfollow_data(follower, followed, follow_activity),
 177          {:ok, activity} <- insert(unfollow_data, local),
 178          :ok,
 179          maybe_federate(activity) do
 180       {:ok, activity}
 181     end
 182   end
 183
 184   def delete(%Object{data: %{"id" => id, "actor" => actor}} = object, local \\ true) do
 185     user = User.get_cached_by_ap_id(actor)
 186
 187     data = %{
 188       "type" => "Delete",
 189       "actor" => actor,
 190       "object" => id,
 191       "to" => [user.follower_address, "https://www.w3.org/ns/activitystreams#Public"]
 192     }
 193
 194     with Repo.delete(object),
 195          Repo.delete_all(Activity.all_non_create_by_object_ap_id_q(id)),
 196          {:ok, activity} <- insert(data, local),
 197          :ok <- maybe_federate(activity),
 198          {:ok, actor} <- User.decrease_note_count(user) do
 199       {:ok, activity}
 200     end
 201   end
 202
 203   def fetch_activities_for_context(context, opts \\ %{}) do
 204     public = ["https://www.w3.org/ns/activitystreams#Public"]
 205
 206     recipients =
 207       if opts["user"], do: [opts["user"].ap_id | opts["user"].following] ++ public, else: public
 208
 209     query = from(activity in Activity)
 210
 211     query =
 212       query
 213       |> restrict_blocked(opts)
 214       |> restrict_recipients(recipients, opts["user"])
 215
 216     query =
 217       from(
 218         activity in query,
 219         where:
 220           fragment(
 221             "?->>'type' = ? and ?->>'context' = ?",
 222             activity.data,
 223             "Create",
 224             activity.data,
 225             ^context
 226           ),
 227         order_by: [desc: :id]
 228       )
 229
 230     Repo.all(query)
 231   end
 232
 233   # TODO: Make this work properly with unlisted.
 234   def fetch_public_activities(opts \\ %{}) do
 235     q = fetch_activities_query(["https://www.w3.org/ns/activitystreams#Public"], opts)
 236
 237     q
 238     |> Repo.all()
 239     |> Enum.reverse()
 240   end
 241
 242   defp restrict_since(query, %{"since_id" => since_id}) do
 243     from(activity in query, where: activity.id > ^since_id)
 244   end
 245
 246   defp restrict_since(query, _), do: query
 247
 248   defp restrict_tag(query, %{"tag" => tag}) do
 249     from(
 250       activity in query,
 251       where: fragment("? <@ (? #> '{\"object\",\"tag\"}')", ^tag, activity.data)
 252     )
 253   end
 254
 255   defp restrict_tag(query, _), do: query
 256
 257   defp restrict_recipients(query, [], user), do: query
 258
 259   defp restrict_recipients(query, recipients, nil) do
 260     from(activity in query, where: fragment("? && ?", ^recipients, activity.recipients))
 261   end
 262
 263   defp restrict_recipients(query, recipients, user) do
 264     from(
 265       activity in query,
 266       where: fragment("? && ?", ^recipients, activity.recipients),
 267       or_where: activity.actor == ^user.ap_id
 268     )
 269   end
 270
 271   defp restrict_limit(query, %{"limit" => limit}) do
 272     from(activity in query, limit: ^limit)
 273   end
 274
 275   defp restrict_limit(query, _), do: query
 276
 277   defp restrict_local(query, %{"local_only" => true}) do
 278     from(activity in query, where: activity.local == true)
 279   end
 280
 281   defp restrict_local(query, _), do: query
 282
 283   defp restrict_max(query, %{"max_id" => max_id}) do
 284     from(activity in query, where: activity.id < ^max_id)
 285   end
 286
 287   defp restrict_max(query, _), do: query
 288
 289   defp restrict_actor(query, %{"actor_id" => actor_id}) do
 290     from(activity in query, where: activity.actor == ^actor_id)
 291   end
 292
 293   defp restrict_actor(query, _), do: query
 294
 295   defp restrict_type(query, %{"type" => type}) when is_binary(type) do
 296     restrict_type(query, %{"type" => [type]})
 297   end
 298
 299   defp restrict_type(query, %{"type" => type}) do
 300     from(activity in query, where: fragment("?->>'type' = ANY(?)", activity.data, ^type))
 301   end
 302
 303   defp restrict_type(query, _), do: query
 304
 305   defp restrict_favorited_by(query, %{"favorited_by" => ap_id}) do
 306     from(
 307       activity in query,
 308       where: fragment("? <@ (? #> '{\"object\",\"likes\"}')", ^ap_id, activity.data)
 309     )
 310   end
 311
 312   defp restrict_favorited_by(query, _), do: query
 313
 314   defp restrict_media(query, %{"only_media" => val}) when val == "true" or val == "1" do
 315     from(
 316       activity in query,
 317       where: fragment("not (? #> '{\"object\",\"attachment\"}' = ?)", activity.data, ^[])
 318     )
 319   end
 320
 321   defp restrict_media(query, _), do: query
 322
 323   # Only search through last 100_000 activities by default
 324   defp restrict_recent(query, %{"whole_db" => true}), do: query
 325
 326   defp restrict_recent(query, _) do
 327     since = (Repo.aggregate(Activity, :max, :id) || 0) - 100_000
 328
 329     from(activity in query, where: activity.id > ^since)
 330   end
 331
 332   defp restrict_blocked(query, %{"blocking_user" => %User{info: info}}) do
 333     blocks = info["blocks"] || []
 334     from(activity in query, where: fragment("not (? = ANY(?))", activity.actor, ^blocks))
 335   end
 336
 337   defp restrict_blocked(query, _), do: query
 338
 339   def fetch_activities_query(recipients, opts \\ %{}) do
 340     base_query =
 341       from(
 342         activity in Activity,
 343         limit: 20,
 344         order_by: [fragment("? desc nulls last", activity.id)]
 345       )
 346
 347     base_query
 348     |> restrict_recipients(recipients, opts["user"])
 349     |> restrict_tag(opts)
 350     |> restrict_since(opts)
 351     |> restrict_local(opts)
 352     |> restrict_limit(opts)
 353     |> restrict_max(opts)
 354     |> restrict_actor(opts)
 355     |> restrict_type(opts)
 356     |> restrict_favorited_by(opts)
 357     |> restrict_recent(opts)
 358     |> restrict_blocked(opts)
 359     |> restrict_media(opts)
 360   end
 361
 362   def fetch_activities(recipients, opts \\ %{}) do
 363     fetch_activities_query(recipients, opts)
 364     |> Repo.all()
 365     |> Enum.reverse()
 366   end
 367
 368   def upload(file) do
 369     data = Upload.store(file)
 370     Repo.insert(%Object{data: data})
 371   end
 372
 373   def user_data_from_user_object(data) do
 374     avatar =
 375       data["icon"]["url"] &&
 376         %{
 377           "type" => "Image",
 378           "url" => [%{"href" => data["icon"]["url"]}]
 379         }
 380
 381     banner =
 382       data["image"]["url"] &&
 383         %{
 384           "type" => "Image",
 385           "url" => [%{"href" => data["image"]["url"]}]
 386         }
 387
 388     user_data = %{
 389       ap_id: data["id"],
 390       info: %{
 391         "ap_enabled" => true,
 392         "source_data" => data,
 393         "banner" => banner
 394       },
 395       avatar: avatar,
 396       nickname: "#{data["preferredUsername"]}@#{URI.parse(data["id"]).host}",
 397       name: data["name"],
 398       follower_address: data["followers"],
 399       bio: data["summary"]
 400     }
 401
 402     {:ok, user_data}
 403   end
 404
 405   def fetch_and_prepare_user_from_ap_id(ap_id) do
 406     with {:ok, %{status_code: 200, body: body}} <-
 407            @httpoison.get(ap_id, Accept: "application/activity+json"),
 408          {:ok, data} <- Jason.decode(body) do
 409       user_data_from_user_object(data)
 410     else
 411       e -> Logger.error("Could not decode user at fetch #{ap_id}, #{inspect(e)}")
 412     end
 413   end
 414
 415   def make_user_from_ap_id(ap_id) do
 416     if user = User.get_by_ap_id(ap_id) do
 417       Transmogrifier.upgrade_user_from_ap_id(ap_id)
 418     else
 419       with {:ok, data} <- fetch_and_prepare_user_from_ap_id(ap_id) do
 420         User.insert_or_update_user(data)
 421       else
 422         e -> {:error, e}
 423       end
 424     end
 425   end
 426
 427   def make_user_from_nickname(nickname) do
 428     with {:ok, %{"ap_id" => ap_id}} when not is_nil(ap_id) <- WebFinger.finger(nickname) do
 429       make_user_from_ap_id(ap_id)
 430     else
 431       _e -> {:error, "No AP id in WebFinger"}
 432     end
 433   end
 434
 435   def publish(actor, activity) do
 436     followers =
 437       if actor.follower_address in activity.recipients do
 438         {:ok, followers} = User.get_followers(actor)
 439         followers |> Enum.filter(&(!&1.local))
 440       else
 441         []
 442       end
 443
 444     remote_inboxes =
 445       (Pleroma.Web.Salmon.remote_users(activity) ++ followers)
 446       |> Enum.filter(fn user -> User.ap_enabled?(user) end)
 447       |> Enum.map(fn %{info: %{"source_data" => data}} ->
 448         (data["endpoints"] && data["endpoints"]["sharedInbox"]) || data["inbox"]
 449       end)
 450       |> Enum.uniq()
 451
 452     {:ok, data} = Transmogrifier.prepare_outgoing(activity.data)
 453     json = Jason.encode!(data)
 454
 455     Enum.each(remote_inboxes, fn inbox ->
 456       Federator.enqueue(:publish_single_ap, %{
 457         inbox: inbox,
 458         json: json,
 459         actor: actor,
 460         id: activity.data["id"]
 461       })
 462     end)
 463   end
 464
 465   def publish_one(%{inbox: inbox, json: json, actor: actor, id: id}) do
 466     Logger.info("Federating #{id} to #{inbox}")
 467     host = URI.parse(inbox).host
 468
 469     signature =
 470       Pleroma.Web.HTTPSignatures.sign(actor, %{host: host, "content-length": byte_size(json)})
 471
 472     @httpoison.post(
 473       inbox,
 474       json,
 475       [{"Content-Type", "application/activity+json"}, {"signature", signature}],
 476       hackney: [pool: :default]
 477     )
 478   end
 479
 480   # TODO:
 481   # This will create a Create activity, which we need internally at the moment.
 482   def fetch_object_from_id(id) do
 483     if object = Object.get_cached_by_ap_id(id) do
 484       {:ok, object}
 485     else
 486       Logger.info("Fetching #{id} via AP")
 487
 488       with true <- String.starts_with?(id, "http"),
 489            {:ok, %{body: body, status_code: code}} when code in 200..299 <-
 490              @httpoison.get(
 491                id,
 492                [Accept: "application/activity+json"],
 493                follow_redirect: true,
 494                timeout: 10000,
 495                recv_timeout: 20000
 496              ),
 497            {:ok, data} <- Jason.decode(body),
 498            nil <- Object.get_by_ap_id(data["id"]),
 499            params <- %{
 500              "type" => "Create",
 501              "to" => data["to"],
 502              "cc" => data["cc"],
 503              "actor" => data["attributedTo"],
 504              "object" => data
 505            },
 506            {:ok, activity} <- Transmogrifier.handle_incoming(params) do
 507         {:ok, Object.get_by_ap_id(activity.data["object"]["id"])}
 508       else
 509         object = %Object{} ->
 510           {:ok, object}
 511
 512         e ->
 513           Logger.info("Couldn't get object via AP, trying out OStatus fetching...")
 514
 515           case OStatus.fetch_activity_from_url(id) do
 516             {:ok, [activity | _]} -> {:ok, Object.get_by_ap_id(activity.data["object"]["id"])}
 517             e -> e
 518           end
 519       end
 520     end
 521   end
 522
 523   def is_public?(activity) do
 524     "https://www.w3.org/ns/activitystreams#Public" in (activity.data["to"] ++
 525                                                          (activity.data["cc"] || []))
 526   end
 527
 528   def visible_for_user?(activity, nil) do
 529     is_public?(activity)
 530   end
 531
 532   def visible_for_user?(activity, user) do
 533     x = [user.ap_id | user.following]
 534     y = activity.data["to"] ++ (activity.data["cc"] || [])
 535     visible_for_user?(activity, nil) || Enum.any?(x, &(&1 in y))
 536   end
 537 end