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

   1 # Pleroma: A lightweight social networking server
   2 # Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
   3 # SPDX-License-Identifier: AGPL-3.0-only
   4
   5 defmodule Pleroma.Web.ActivityPub.Transmogrifier do
   6   @moduledoc """
   7   A module to handle coding from internal to wire ActivityPub and back.
   8   """
   9   alias Pleroma.Activity
  10   alias Pleroma.FollowingRelationship
  11   alias Pleroma.Object
  12   alias Pleroma.Object.Containment
  13   alias Pleroma.Repo
  14   alias Pleroma.User
  15   alias Pleroma.Web.ActivityPub.ActivityPub
  16   alias Pleroma.Web.ActivityPub.ObjectValidator
  17   alias Pleroma.Web.ActivityPub.ObjectValidators.LikeValidator
  18   alias Pleroma.Web.ActivityPub.Pipeline
  19   alias Pleroma.Web.ActivityPub.Utils
  20   alias Pleroma.Web.ActivityPub.Visibility
  21   alias Pleroma.Web.Federator
  22   alias Pleroma.Workers.TransmogrifierWorker
  23
  24   import Ecto.Query
  25
  26   require Logger
  27   require Pleroma.Constants
  28
  29   @doc """
  30   Modifies an incoming AP object (mastodon format) to our internal format.
  31   """
  32   def fix_object(object, options \\ []) do
  33     object
  34     |> strip_internal_fields
  35     |> fix_actor
  36     |> fix_url
  37     |> fix_attachments
  38     |> fix_context
  39     |> fix_in_reply_to(options)
  40     |> fix_emoji
  41     |> fix_tag
  42     |> fix_content_map
  43     |> fix_addressing
  44     |> fix_summary
  45     |> fix_type(options)
  46   end
  47
  48   def fix_summary(%{"summary" => nil} = object) do
  49     Map.put(object, "summary", "")
  50   end
  51
  52   def fix_summary(%{"summary" => _} = object) do
  53     # summary is present, nothing to do
  54     object
  55   end
  56
  57   def fix_summary(object), do: Map.put(object, "summary", "")
  58
  59   def fix_addressing_list(map, field) do
  60     cond do
  61       is_binary(map[field]) ->
  62         Map.put(map, field, [map[field]])
  63
  64       is_nil(map[field]) ->
  65         Map.put(map, field, [])
  66
  67       true ->
  68         map
  69     end
  70   end
  71
  72   def fix_explicit_addressing(
  73         %{"to" => to, "cc" => cc} = object,
  74         explicit_mentions,
  75         follower_collection
  76       ) do
  77     explicit_to = Enum.filter(to, fn x -> x in explicit_mentions end)
  78
  79     explicit_cc = Enum.filter(to, fn x -> x not in explicit_mentions end)
  80
  81     final_cc =
  82       (cc ++ explicit_cc)
  83       |> Enum.reject(fn x -> String.ends_with?(x, "/followers") and x != follower_collection end)
  84       |> Enum.uniq()
  85
  86     object
  87     |> Map.put("to", explicit_to)
  88     |> Map.put("cc", final_cc)
  89   end
  90
  91   def fix_explicit_addressing(object, _explicit_mentions, _followers_collection), do: object
  92
  93   # if directMessage flag is set to true, leave the addressing alone
  94   def fix_explicit_addressing(%{"directMessage" => true} = object), do: object
  95
  96   def fix_explicit_addressing(object) do
  97     explicit_mentions = Utils.determine_explicit_mentions(object)
  98
  99     %User{follower_address: follower_collection} =
 100       object
 101       |> Containment.get_actor()
 102       |> User.get_cached_by_ap_id()
 103
 104     explicit_mentions =
 105       explicit_mentions ++
 106         [
 107           Pleroma.Constants.as_public(),
 108           follower_collection
 109         ]
 110
 111     fix_explicit_addressing(object, explicit_mentions, follower_collection)
 112   end
 113
 114   # if as:Public is addressed, then make sure the followers collection is also addressed
 115   # so that the activities will be delivered to local users.
 116   def fix_implicit_addressing(%{"to" => to, "cc" => cc} = object, followers_collection) do
 117     recipients = to ++ cc
 118
 119     if followers_collection not in recipients do
 120       cond do
 121         Pleroma.Constants.as_public() in cc ->
 122           to = to ++ [followers_collection]
 123           Map.put(object, "to", to)
 124
 125         Pleroma.Constants.as_public() in to ->
 126           cc = cc ++ [followers_collection]
 127           Map.put(object, "cc", cc)
 128
 129         true ->
 130           object
 131       end
 132     else
 133       object
 134     end
 135   end
 136
 137   def fix_implicit_addressing(object, _), do: object
 138
 139   def fix_addressing(object) do
 140     {:ok, %User{} = user} = User.get_or_fetch_by_ap_id(object["actor"])
 141     followers_collection = User.ap_followers(user)
 142
 143     object
 144     |> fix_addressing_list("to")
 145     |> fix_addressing_list("cc")
 146     |> fix_addressing_list("bto")
 147     |> fix_addressing_list("bcc")
 148     |> fix_explicit_addressing()
 149     |> fix_implicit_addressing(followers_collection)
 150   end
 151
 152   def fix_actor(%{"attributedTo" => actor} = object) do
 153     Map.put(object, "actor", Containment.get_actor(%{"actor" => actor}))
 154   end
 155
 156   def fix_in_reply_to(object, options \\ [])
 157
 158   def fix_in_reply_to(%{"inReplyTo" => in_reply_to} = object, options)
 159       when not is_nil(in_reply_to) do
 160     in_reply_to_id = prepare_in_reply_to(in_reply_to)
 161     object = Map.put(object, "inReplyToAtomUri", in_reply_to_id)
 162     depth = (options[:depth] || 0) + 1
 163
 164     if Federator.allowed_thread_distance?(depth) do
 165       with {:ok, replied_object} <- get_obj_helper(in_reply_to_id, options),
 166            %Activity{} <- Activity.get_create_by_object_ap_id(replied_object.data["id"]) do
 167         object
 168         |> Map.put("inReplyTo", replied_object.data["id"])
 169         |> Map.put("inReplyToAtomUri", object["inReplyToAtomUri"] || in_reply_to_id)
 170         |> Map.put("conversation", replied_object.data["context"] || object["conversation"])
 171         |> Map.put("context", replied_object.data["context"] || object["conversation"])
 172       else
 173         e ->
 174           Logger.error("Couldn't fetch #{inspect(in_reply_to_id)}, error: #{inspect(e)}")
 175           object
 176       end
 177     else
 178       object
 179     end
 180   end
 181
 182   def fix_in_reply_to(object, _options), do: object
 183
 184   defp prepare_in_reply_to(in_reply_to) do
 185     cond do
 186       is_bitstring(in_reply_to) ->
 187         in_reply_to
 188
 189       is_map(in_reply_to) && is_bitstring(in_reply_to["id"]) ->
 190         in_reply_to["id"]
 191
 192       is_list(in_reply_to) && is_bitstring(Enum.at(in_reply_to, 0)) ->
 193         Enum.at(in_reply_to, 0)
 194
 195       true ->
 196         ""
 197     end
 198   end
 199
 200   def fix_context(object) do
 201     context = object["context"] || object["conversation"] || Utils.generate_context_id()
 202
 203     object
 204     |> Map.put("context", context)
 205     |> Map.put("conversation", context)
 206   end
 207
 208   defp add_if_present(map, _key, nil), do: map
 209
 210   defp add_if_present(map, key, value) do
 211     Map.put(map, key, value)
 212   end
 213
 214   def fix_attachments(%{"attachment" => attachment} = object) when is_list(attachment) do
 215     attachments =
 216       Enum.map(attachment, fn data ->
 217         url =
 218           cond do
 219             is_list(data["url"]) -> List.first(data["url"])
 220             is_map(data["url"]) -> data["url"]
 221             true -> nil
 222           end
 223
 224         media_type =
 225           cond do
 226             is_map(url) && is_binary(url["mediaType"]) -> url["mediaType"]
 227             is_binary(data["mediaType"]) -> data["mediaType"]
 228             is_binary(data["mimeType"]) -> data["mimeType"]
 229             true -> nil
 230           end
 231
 232         href =
 233           cond do
 234             is_map(url) && is_binary(url["href"]) -> url["href"]
 235             is_binary(data["url"]) -> data["url"]
 236             is_binary(data["href"]) -> data["href"]
 237           end
 238
 239         attachment_url =
 240           %{"href" => href}
 241           |> add_if_present("mediaType", media_type)
 242           |> add_if_present("type", Map.get(url || %{}, "type"))
 243
 244         %{"url" => [attachment_url]}
 245         |> add_if_present("mediaType", media_type)
 246         |> add_if_present("type", data["type"])
 247         |> add_if_present("name", data["name"])
 248       end)
 249
 250     Map.put(object, "attachment", attachments)
 251   end
 252
 253   def fix_attachments(%{"attachment" => attachment} = object) when is_map(attachment) do
 254     object
 255     |> Map.put("attachment", [attachment])
 256     |> fix_attachments()
 257   end
 258
 259   def fix_attachments(object), do: object
 260
 261   def fix_url(%{"url" => url} = object) when is_map(url) do
 262     Map.put(object, "url", url["href"])
 263   end
 264
 265   def fix_url(%{"type" => object_type, "url" => url} = object)
 266       when object_type in ["Video", "Audio"] and is_list(url) do
 267     first_element = Enum.at(url, 0)
 268
 269     link_element = Enum.find(url, fn x -> is_map(x) and x["mimeType"] == "text/html" end)
 270
 271     object
 272     |> Map.put("attachment", [first_element])
 273     |> Map.put("url", link_element["href"])
 274   end
 275
 276   def fix_url(%{"type" => object_type, "url" => url} = object)
 277       when object_type != "Video" and is_list(url) do
 278     first_element = Enum.at(url, 0)
 279
 280     url_string =
 281       cond do
 282         is_bitstring(first_element) -> first_element
 283         is_map(first_element) -> first_element["href"] || ""
 284         true -> ""
 285       end
 286
 287     Map.put(object, "url", url_string)
 288   end
 289
 290   def fix_url(object), do: object
 291
 292   def fix_emoji(%{"tag" => tags} = object) when is_list(tags) do
 293     emoji =
 294       tags
 295       |> Enum.filter(fn data -> data["type"] == "Emoji" and data["icon"] end)
 296       |> Enum.reduce(%{}, fn data, mapping ->
 297         name = String.trim(data["name"], ":")
 298
 299         Map.put(mapping, name, data["icon"]["url"])
 300       end)
 301
 302     # we merge mastodon and pleroma emoji into a single mapping, to allow for both wire formats
 303     emoji = Map.merge(object["emoji"] || %{}, emoji)
 304
 305     Map.put(object, "emoji", emoji)
 306   end
 307
 308   def fix_emoji(%{"tag" => %{"type" => "Emoji"} = tag} = object) do
 309     name = String.trim(tag["name"], ":")
 310     emoji = %{name => tag["icon"]["url"]}
 311
 312     Map.put(object, "emoji", emoji)
 313   end
 314
 315   def fix_emoji(object), do: object
 316
 317   def fix_tag(%{"tag" => tag} = object) when is_list(tag) do
 318     tags =
 319       tag
 320       |> Enum.filter(fn data -> data["type"] == "Hashtag" and data["name"] end)
 321       |> Enum.map(fn data -> String.slice(data["name"], 1..-1) end)
 322
 323     Map.put(object, "tag", tag ++ tags)
 324   end
 325
 326   def fix_tag(%{"tag" => %{"type" => "Hashtag", "name" => hashtag} = tag} = object) do
 327     combined = [tag, String.slice(hashtag, 1..-1)]
 328
 329     Map.put(object, "tag", combined)
 330   end
 331
 332   def fix_tag(%{"tag" => %{} = tag} = object), do: Map.put(object, "tag", [tag])
 333
 334   def fix_tag(object), do: object
 335
 336   # content map usually only has one language so this will do for now.
 337   def fix_content_map(%{"contentMap" => content_map} = object) do
 338     content_groups = Map.to_list(content_map)
 339     {_, content} = Enum.at(content_groups, 0)
 340
 341     Map.put(object, "content", content)
 342   end
 343
 344   def fix_content_map(object), do: object
 345
 346   def fix_type(object, options \\ [])
 347
 348   def fix_type(%{"inReplyTo" => reply_id, "name" => _} = object, options)
 349       when is_binary(reply_id) do
 350     with true <- Federator.allowed_thread_distance?(options[:depth]),
 351          {:ok, %{data: %{"type" => "Question"} = _} = _} <- get_obj_helper(reply_id, options) do
 352       Map.put(object, "type", "Answer")
 353     else
 354       _ -> object
 355     end
 356   end
 357
 358   def fix_type(object, _), do: object
 359
 360   defp mastodon_follow_hack(%{"id" => id, "actor" => follower_id}, followed) do
 361     with true <- id =~ "follows",
 362          %User{local: true} = follower <- User.get_cached_by_ap_id(follower_id),
 363          %Activity{} = activity <- Utils.fetch_latest_follow(follower, followed) do
 364       {:ok, activity}
 365     else
 366       _ -> {:error, nil}
 367     end
 368   end
 369
 370   defp mastodon_follow_hack(_, _), do: {:error, nil}
 371
 372   defp get_follow_activity(follow_object, followed) do
 373     with object_id when not is_nil(object_id) <- Utils.get_ap_id(follow_object),
 374          {_, %Activity{} = activity} <- {:activity, Activity.get_by_ap_id(object_id)} do
 375       {:ok, activity}
 376     else
 377       # Can't find the activity. This might a Mastodon 2.3 "Accept"
 378       {:activity, nil} ->
 379         mastodon_follow_hack(follow_object, followed)
 380
 381       _ ->
 382         {:error, nil}
 383     end
 384   end
 385
 386   # Reduce the object list to find the reported user.
 387   defp get_reported(objects) do
 388     Enum.reduce_while(objects, nil, fn ap_id, _ ->
 389       with %User{} = user <- User.get_cached_by_ap_id(ap_id) do
 390         {:halt, user}
 391       else
 392         _ -> {:cont, nil}
 393       end
 394     end)
 395   end
 396
 397   def handle_incoming(data, options \\ [])
 398
 399   # Flag objects are placed ahead of the ID check because Mastodon 2.8 and earlier send them
 400   # with nil ID.
 401   def handle_incoming(%{"type" => "Flag", "object" => objects, "actor" => actor} = data, _options) do
 402     with context <- data["context"] || Utils.generate_context_id(),
 403          content <- data["content"] || "",
 404          %User{} = actor <- User.get_cached_by_ap_id(actor),
 405          # Reduce the object list to find the reported user.
 406          %User{} = account <- get_reported(objects),
 407          # Remove the reported user from the object list.
 408          statuses <- Enum.filter(objects, fn ap_id -> ap_id != account.ap_id end) do
 409       %{
 410         actor: actor,
 411         context: context,
 412         account: account,
 413         statuses: statuses,
 414         content: content,
 415         additional: %{"cc" => [account.ap_id]}
 416       }
 417       |> ActivityPub.flag()
 418     end
 419   end
 420
 421   # disallow objects with bogus IDs
 422   def handle_incoming(%{"id" => nil}, _options), do: :error
 423   def handle_incoming(%{"id" => ""}, _options), do: :error
 424   # length of https:// = 8, should validate better, but good enough for now.
 425   def handle_incoming(%{"id" => id}, _options) when is_binary(id) and byte_size(id) < 8,
 426     do: :error
 427
 428   # TODO: validate those with a Ecto scheme
 429   # - tags
 430   # - emoji
 431   def handle_incoming(
 432         %{"type" => "Create", "object" => %{"type" => objtype} = object} = data,
 433         options
 434       )
 435       when objtype in ["Article", "Event", "Note", "Video", "Page", "Question", "Answer", "Audio"] do
 436     actor = Containment.get_actor(data)
 437
 438     data =
 439       Map.put(data, "actor", actor)
 440       |> fix_addressing
 441
 442     with nil <- Activity.get_create_by_object_ap_id(object["id"]),
 443          {:ok, %User{} = user} <- User.get_or_fetch_by_ap_id(data["actor"]) do
 444       object = fix_object(object, options)
 445
 446       params = %{
 447         to: data["to"],
 448         object: object,
 449         actor: user,
 450         context: object["conversation"],
 451         local: false,
 452         published: data["published"],
 453         additional:
 454           Map.take(data, [
 455             "cc",
 456             "directMessage",
 457             "id"
 458           ])
 459       }
 460
 461       with {:ok, created_activity} <- ActivityPub.create(params) do
 462         reply_depth = (options[:depth] || 0) + 1
 463
 464         if Federator.allowed_thread_distance?(reply_depth) do
 465           for reply_id <- replies(object) do
 466             Pleroma.Workers.RemoteFetcherWorker.enqueue("fetch_remote", %{
 467               "id" => reply_id,
 468               "depth" => reply_depth
 469             })
 470           end
 471         end
 472
 473         {:ok, created_activity}
 474       end
 475     else
 476       %Activity{} = activity -> {:ok, activity}
 477       _e -> :error
 478     end
 479   end
 480
 481   def handle_incoming(
 482         %{"type" => "Listen", "object" => %{"type" => "Audio"} = object} = data,
 483         options
 484       ) do
 485     actor = Containment.get_actor(data)
 486
 487     data =
 488       Map.put(data, "actor", actor)
 489       |> fix_addressing
 490
 491     with {:ok, %User{} = user} <- User.get_or_fetch_by_ap_id(data["actor"]) do
 492       reply_depth = (options[:depth] || 0) + 1
 493       options = Keyword.put(options, :depth, reply_depth)
 494       object = fix_object(object, options)
 495
 496       params = %{
 497         to: data["to"],
 498         object: object,
 499         actor: user,
 500         context: nil,
 501         local: false,
 502         published: data["published"],
 503         additional: Map.take(data, ["cc", "id"])
 504       }
 505
 506       ActivityPub.listen(params)
 507     else
 508       _e -> :error
 509     end
 510   end
 511
 512   def handle_incoming(
 513         %{"type" => "Follow", "object" => followed, "actor" => follower, "id" => id} = data,
 514         _options
 515       ) do
 516     with %User{local: true} = followed <-
 517            User.get_cached_by_ap_id(Containment.get_actor(%{"actor" => followed})),
 518          {:ok, %User{} = follower} <-
 519            User.get_or_fetch_by_ap_id(Containment.get_actor(%{"actor" => follower})),
 520          {:ok, activity} <- ActivityPub.follow(follower, followed, id, false) do
 521       with deny_follow_blocked <- Pleroma.Config.get([:user, :deny_follow_blocked]),
 522            {_, false} <- {:user_blocked, User.blocks?(followed, follower) && deny_follow_blocked},
 523            {_, false} <- {:user_locked, User.locked?(followed)},
 524            {_, {:ok, follower}} <- {:follow, User.follow(follower, followed)},
 525            {_, {:ok, _}} <-
 526              {:follow_state_update, Utils.update_follow_state_for_all(activity, "accept")},
 527            {:ok, _relationship} <-
 528              FollowingRelationship.update(follower, followed, :follow_accept) do
 529         ActivityPub.accept(%{
 530           to: [follower.ap_id],
 531           actor: followed,
 532           object: data,
 533           local: true
 534         })
 535       else
 536         {:user_blocked, true} ->
 537           {:ok, _} = Utils.update_follow_state_for_all(activity, "reject")
 538           {:ok, _relationship} = FollowingRelationship.update(follower, followed, :follow_reject)
 539
 540           ActivityPub.reject(%{
 541             to: [follower.ap_id],
 542             actor: followed,
 543             object: data,
 544             local: true
 545           })
 546
 547         {:follow, {:error, _}} ->
 548           {:ok, _} = Utils.update_follow_state_for_all(activity, "reject")
 549           {:ok, _relationship} = FollowingRelationship.update(follower, followed, :follow_reject)
 550
 551           ActivityPub.reject(%{
 552             to: [follower.ap_id],
 553             actor: followed,
 554             object: data,
 555             local: true
 556           })
 557
 558         {:user_locked, true} ->
 559           {:ok, _relationship} = FollowingRelationship.update(follower, followed, :follow_pending)
 560           :noop
 561       end
 562
 563       {:ok, activity}
 564     else
 565       _e ->
 566         :error
 567     end
 568   end
 569
 570   def handle_incoming(
 571         %{"type" => "Accept", "object" => follow_object, "actor" => _actor, "id" => id} = data,
 572         _options
 573       ) do
 574     with actor <- Containment.get_actor(data),
 575          {:ok, %User{} = followed} <- User.get_or_fetch_by_ap_id(actor),
 576          {:ok, follow_activity} <- get_follow_activity(follow_object, followed),
 577          {:ok, follow_activity} <- Utils.update_follow_state_for_all(follow_activity, "accept"),
 578          %User{local: true} = follower <- User.get_cached_by_ap_id(follow_activity.data["actor"]),
 579          {:ok, _relationship} <- FollowingRelationship.update(follower, followed, :follow_accept) do
 580       ActivityPub.accept(%{
 581         to: follow_activity.data["to"],
 582         type: "Accept",
 583         actor: followed,
 584         object: follow_activity.data["id"],
 585         local: false,
 586         activity_id: id
 587       })
 588     else
 589       _e -> :error
 590     end
 591   end
 592
 593   def handle_incoming(
 594         %{"type" => "Reject", "object" => follow_object, "actor" => _actor, "id" => id} = data,
 595         _options
 596       ) do
 597     with actor <- Containment.get_actor(data),
 598          {:ok, %User{} = followed} <- User.get_or_fetch_by_ap_id(actor),
 599          {:ok, follow_activity} <- get_follow_activity(follow_object, followed),
 600          {:ok, follow_activity} <- Utils.update_follow_state_for_all(follow_activity, "reject"),
 601          %User{local: true} = follower <- User.get_cached_by_ap_id(follow_activity.data["actor"]),
 602          {:ok, _relationship} <- FollowingRelationship.update(follower, followed, :follow_reject),
 603          {:ok, activity} <-
 604            ActivityPub.reject(%{
 605              to: follow_activity.data["to"],
 606              type: "Reject",
 607              actor: followed,
 608              object: follow_activity.data["id"],
 609              local: false,
 610              activity_id: id
 611            }) do
 612       {:ok, activity}
 613     else
 614       _e -> :error
 615     end
 616   end
 617
 618   @misskey_reactions %{
 619     "like" => "👍",
 620     "love" => "❤️",
 621     "laugh" => "😆",
 622     "hmm" => "🤔",
 623     "surprise" => "😮",
 624     "congrats" => "🎉",
 625     "angry" => "💢",
 626     "confused" => "😥",
 627     "rip" => "😇",
 628     "pudding" => "🍮",
 629     "star" => "⭐"
 630   }
 631
 632   @doc "Rewrite misskey likes into EmojiReacts"
 633   def handle_incoming(
 634         %{
 635           "type" => "Like",
 636           "_misskey_reaction" => reaction
 637         } = data,
 638         options
 639       ) do
 640     data
 641     |> Map.put("type", "EmojiReact")
 642     |> Map.put("content", @misskey_reactions[reaction] || reaction)
 643     |> handle_incoming(options)
 644   end
 645
 646   def handle_incoming(%{"type" => "Like"} = data, _options) do
 647     with {_, {:ok, cast_data_sym}} <-
 648            {:casting_data,
 649             data |> LikeValidator.cast_data() |> Ecto.Changeset.apply_action(:insert)},
 650          cast_data = ObjectValidator.stringify_keys(Map.from_struct(cast_data_sym)),
 651          :ok <- ObjectValidator.fetch_actor_and_object(cast_data),
 652          {_, {:ok, cast_data}} <- {:ensure_context_presence, ensure_context_presence(cast_data)},
 653          {_, {:ok, cast_data}} <-
 654            {:ensure_recipients_presence, ensure_recipients_presence(cast_data)},
 655          {_, {:ok, activity, _meta}} <-
 656            {:common_pipeline, Pipeline.common_pipeline(cast_data, local: false)} do
 657       {:ok, activity}
 658     else
 659       e -> {:error, e}
 660     end
 661   end
 662
 663   def handle_incoming(
 664         %{
 665           "type" => "EmojiReact",
 666           "object" => object_id,
 667           "actor" => _actor,
 668           "id" => id,
 669           "content" => emoji
 670         } = data,
 671         _options
 672       ) do
 673     with actor <- Containment.get_actor(data),
 674          {:ok, %User{} = actor} <- User.get_or_fetch_by_ap_id(actor),
 675          {:ok, object} <- get_obj_helper(object_id),
 676          {:ok, activity, _object} <-
 677            ActivityPub.react_with_emoji(actor, object, emoji, activity_id: id, local: false) do
 678       {:ok, activity}
 679     else
 680       _e -> :error
 681     end
 682   end
 683
 684   def handle_incoming(
 685         %{"type" => "Announce", "object" => object_id, "actor" => _actor, "id" => id} = data,
 686         _options
 687       ) do
 688     with actor <- Containment.get_actor(data),
 689          {:ok, %User{} = actor} <- User.get_or_fetch_by_ap_id(actor),
 690          {:ok, object} <- get_embedded_obj_helper(object_id, actor),
 691          public <- Visibility.is_public?(data),
 692          {:ok, activity, _object} <- ActivityPub.announce(actor, object, id, false, public) do
 693       {:ok, activity}
 694     else
 695       _e -> :error
 696     end
 697   end
 698
 699   def handle_incoming(
 700         %{"type" => "Update", "object" => %{"type" => object_type} = object, "actor" => actor_id} =
 701           data,
 702         _options
 703       )
 704       when object_type in [
 705              "Person",
 706              "Application",
 707              "Service",
 708              "Organization"
 709            ] do
 710     with %User{ap_id: ^actor_id} = actor <- User.get_cached_by_ap_id(object["id"]) do
 711       {:ok, new_user_data} = ActivityPub.user_data_from_user_object(object)
 712
 713       actor
 714       |> User.remote_user_changeset(new_user_data)
 715       |> User.update_and_set_cache()
 716
 717       ActivityPub.update(%{
 718         local: false,
 719         to: data["to"] || [],
 720         cc: data["cc"] || [],
 721         object: object,
 722         actor: actor_id,
 723         activity_id: data["id"]
 724       })
 725     else
 726       e ->
 727         Logger.error(e)
 728         :error
 729     end
 730   end
 731
 732   # TODO: We presently assume that any actor on the same origin domain as the object being
 733   # deleted has the rights to delete that object.  A better way to validate whether or not
 734   # the object should be deleted is to refetch the object URI, which should return either
 735   # an error or a tombstone.  This would allow us to verify that a deletion actually took
 736   # place.
 737   def handle_incoming(
 738         %{"type" => "Delete", "object" => object_id, "actor" => actor, "id" => id} = data,
 739         _options
 740       ) do
 741     object_id = Utils.get_ap_id(object_id)
 742
 743     with actor <- Containment.get_actor(data),
 744          {:ok, %User{} = actor} <- User.get_or_fetch_by_ap_id(actor),
 745          {:ok, object} <- get_obj_helper(object_id),
 746          :ok <- Containment.contain_origin(actor.ap_id, object.data),
 747          {:ok, activity} <-
 748            ActivityPub.delete(object, local: false, activity_id: id, actor: actor.ap_id) do
 749       {:ok, activity}
 750     else
 751       nil ->
 752         case User.get_cached_by_ap_id(object_id) do
 753           %User{ap_id: ^actor} = user ->
 754             User.delete(user)
 755
 756           nil ->
 757             :error
 758         end
 759
 760       _e ->
 761         :error
 762     end
 763   end
 764
 765   def handle_incoming(
 766         %{
 767           "type" => "Undo",
 768           "object" => %{"type" => "Announce", "object" => object_id},
 769           "actor" => _actor,
 770           "id" => id
 771         } = data,
 772         _options
 773       ) do
 774     with actor <- Containment.get_actor(data),
 775          {:ok, %User{} = actor} <- User.get_or_fetch_by_ap_id(actor),
 776          {:ok, object} <- get_obj_helper(object_id),
 777          {:ok, activity, _} <- ActivityPub.unannounce(actor, object, id, false) do
 778       {:ok, activity}
 779     else
 780       _e -> :error
 781     end
 782   end
 783
 784   def handle_incoming(
 785         %{
 786           "type" => "Undo",
 787           "object" => %{"type" => "Follow", "object" => followed},
 788           "actor" => follower,
 789           "id" => id
 790         } = _data,
 791         _options
 792       ) do
 793     with %User{local: true} = followed <- User.get_cached_by_ap_id(followed),
 794          {:ok, %User{} = follower} <- User.get_or_fetch_by_ap_id(follower),
 795          {:ok, activity} <- ActivityPub.unfollow(follower, followed, id, false) do
 796       User.unfollow(follower, followed)
 797       {:ok, activity}
 798     else
 799       _e -> :error
 800     end
 801   end
 802
 803   def handle_incoming(
 804         %{
 805           "type" => "Undo",
 806           "object" => %{"type" => "EmojiReact", "id" => reaction_activity_id},
 807           "actor" => _actor,
 808           "id" => id
 809         } = data,
 810         _options
 811       ) do
 812     with actor <- Containment.get_actor(data),
 813          {:ok, %User{} = actor} <- User.get_or_fetch_by_ap_id(actor),
 814          {:ok, activity, _} <-
 815            ActivityPub.unreact_with_emoji(actor, reaction_activity_id,
 816              activity_id: id,
 817              local: false
 818            ) do
 819       {:ok, activity}
 820     else
 821       _e -> :error
 822     end
 823   end
 824
 825   def handle_incoming(
 826         %{
 827           "type" => "Undo",
 828           "object" => %{"type" => "Block", "object" => blocked},
 829           "actor" => blocker,
 830           "id" => id
 831         } = _data,
 832         _options
 833       ) do
 834     with %User{local: true} = blocked <- User.get_cached_by_ap_id(blocked),
 835          {:ok, %User{} = blocker} <- User.get_or_fetch_by_ap_id(blocker),
 836          {:ok, activity} <- ActivityPub.unblock(blocker, blocked, id, false) do
 837       User.unblock(blocker, blocked)
 838       {:ok, activity}
 839     else
 840       _e -> :error
 841     end
 842   end
 843
 844   def handle_incoming(
 845         %{"type" => "Block", "object" => blocked, "actor" => blocker, "id" => id} = _data,
 846         _options
 847       ) do
 848     with %User{local: true} = blocked = User.get_cached_by_ap_id(blocked),
 849          {:ok, %User{} = blocker} = User.get_or_fetch_by_ap_id(blocker),
 850          {:ok, activity} <- ActivityPub.block(blocker, blocked, id, false) do
 851       User.unfollow(blocker, blocked)
 852       User.block(blocker, blocked)
 853       {:ok, activity}
 854     else
 855       _e -> :error
 856     end
 857   end
 858
 859   def handle_incoming(
 860         %{
 861           "type" => "Undo",
 862           "object" => %{"type" => "Like", "object" => object_id},
 863           "actor" => _actor,
 864           "id" => id
 865         } = data,
 866         _options
 867       ) do
 868     with actor <- Containment.get_actor(data),
 869          {:ok, %User{} = actor} <- User.get_or_fetch_by_ap_id(actor),
 870          {:ok, object} <- get_obj_helper(object_id),
 871          {:ok, activity, _, _} <- ActivityPub.unlike(actor, object, id, false) do
 872       {:ok, activity}
 873     else
 874       _e -> :error
 875     end
 876   end
 877
 878   # For Undos that don't have the complete object attached, try to find it in our database.
 879   def handle_incoming(
 880         %{
 881           "type" => "Undo",
 882           "object" => object
 883         } = activity,
 884         options
 885       )
 886       when is_binary(object) do
 887     with %Activity{data: data} <- Activity.get_by_ap_id(object) do
 888       activity
 889       |> Map.put("object", data)
 890       |> handle_incoming(options)
 891     else
 892       _e -> :error
 893     end
 894   end
 895
 896   def handle_incoming(
 897         %{
 898           "type" => "Move",
 899           "actor" => origin_actor,
 900           "object" => origin_actor,
 901           "target" => target_actor
 902         },
 903         _options
 904       ) do
 905     with %User{} = origin_user <- User.get_cached_by_ap_id(origin_actor),
 906          {:ok, %User{} = target_user} <- User.get_or_fetch_by_ap_id(target_actor),
 907          true <- origin_actor in target_user.also_known_as do
 908       ActivityPub.move(origin_user, target_user, false)
 909     else
 910       _e -> :error
 911     end
 912   end
 913
 914   def handle_incoming(_, _), do: :error
 915
 916   @spec get_obj_helper(String.t(), Keyword.t()) :: {:ok, Object.t()} | nil
 917   def get_obj_helper(id, options \\ []) do
 918     case Object.normalize(id, true, options) do
 919       %Object{} = object -> {:ok, object}
 920       _ -> nil
 921     end
 922   end
 923
 924   @spec get_embedded_obj_helper(String.t() | Object.t(), User.t()) :: {:ok, Object.t()} | nil
 925   def get_embedded_obj_helper(%{"attributedTo" => attributed_to, "id" => object_id} = data, %User{
 926         ap_id: ap_id
 927       })
 928       when attributed_to == ap_id do
 929     with {:ok, activity} <-
 930            handle_incoming(%{
 931              "type" => "Create",
 932              "to" => data["to"],
 933              "cc" => data["cc"],
 934              "actor" => attributed_to,
 935              "object" => data
 936            }) do
 937       {:ok, Object.normalize(activity)}
 938     else
 939       _ -> get_obj_helper(object_id)
 940     end
 941   end
 942
 943   def get_embedded_obj_helper(object_id, _) do
 944     get_obj_helper(object_id)
 945   end
 946
 947   def set_reply_to_uri(%{"inReplyTo" => in_reply_to} = object) when is_binary(in_reply_to) do
 948     with false <- String.starts_with?(in_reply_to, "http"),
 949          {:ok, %{data: replied_to_object}} <- get_obj_helper(in_reply_to) do
 950       Map.put(object, "inReplyTo", replied_to_object["external_url"] || in_reply_to)
 951     else
 952       _e -> object
 953     end
 954   end
 955
 956   def set_reply_to_uri(obj), do: obj
 957
 958   @doc """
 959   Serialized Mastodon-compatible `replies` collection containing _self-replies_.
 960   Based on Mastodon's ActivityPub::NoteSerializer#replies.
 961   """
 962   def set_replies(obj_data) do
 963     replies_uris =
 964       with limit when limit > 0 <-
 965              Pleroma.Config.get([:activitypub, :note_replies_output_limit], 0),
 966            %Object{} = object <- Object.get_cached_by_ap_id(obj_data["id"]) do
 967         object
 968         |> Object.self_replies()
 969         |> select([o], fragment("?->>'id'", o.data))
 970         |> limit(^limit)
 971         |> Repo.all()
 972       else
 973         _ -> []
 974       end
 975
 976     set_replies(obj_data, replies_uris)
 977   end
 978
 979   defp set_replies(obj, []) do
 980     obj
 981   end
 982
 983   defp set_replies(obj, replies_uris) do
 984     replies_collection = %{
 985       "type" => "Collection",
 986       "items" => replies_uris
 987     }
 988
 989     Map.merge(obj, %{"replies" => replies_collection})
 990   end
 991
 992   def replies(%{"replies" => %{"first" => %{"items" => items}}}) when not is_nil(items) do
 993     items
 994   end
 995
 996   def replies(%{"replies" => %{"items" => items}}) when not is_nil(items) do
 997     items
 998   end
 999
1000   def replies(_), do: []
1001
1002   # Prepares the object of an outgoing create activity.
1003   def prepare_object(object) do
1004     object
1005     |> set_sensitive
1006     |> add_hashtags
1007     |> add_mention_tags
1008     |> add_emoji_tags
1009     |> add_attributed_to
1010     |> prepare_attachments
1011     |> set_conversation
1012     |> set_reply_to_uri
1013     |> set_replies
1014     |> strip_internal_fields
1015     |> strip_internal_tags
1016     |> set_type
1017   end
1018
1019   #  @doc
1020   #  """
1021   #  internal -> Mastodon
1022   #  """
1023
1024   def prepare_outgoing(%{"type" => activity_type, "object" => object_id} = data)
1025       when activity_type in ["Create", "Listen"] do
1026     object =
1027       object_id
1028       |> Object.normalize()
1029       |> Map.get(:data)
1030       |> prepare_object
1031
1032     data =
1033       data
1034       |> Map.put("object", object)
1035       |> Map.merge(Utils.make_json_ld_header())
1036       |> Map.delete("bcc")
1037
1038     {:ok, data}
1039   end
1040
1041   def prepare_outgoing(%{"type" => "Announce", "actor" => ap_id, "object" => object_id} = data) do
1042     object =
1043       object_id
1044       |> Object.normalize()
1045
1046     data =
1047       if Visibility.is_private?(object) && object.data["actor"] == ap_id do
1048         data |> Map.put("object", object |> Map.get(:data) |> prepare_object)
1049       else
1050         data |> maybe_fix_object_url
1051       end
1052
1053     data =
1054       data
1055       |> strip_internal_fields
1056       |> Map.merge(Utils.make_json_ld_header())
1057       |> Map.delete("bcc")
1058
1059     {:ok, data}
1060   end
1061
1062   # Mastodon Accept/Reject requires a non-normalized object containing the actor URIs,
1063   # because of course it does.
1064   def prepare_outgoing(%{"type" => "Accept"} = data) do
1065     with follow_activity <- Activity.normalize(data["object"]) do
1066       object = %{
1067         "actor" => follow_activity.actor,
1068         "object" => follow_activity.data["object"],
1069         "id" => follow_activity.data["id"],
1070         "type" => "Follow"
1071       }
1072
1073       data =
1074         data
1075         |> Map.put("object", object)
1076         |> Map.merge(Utils.make_json_ld_header())
1077
1078       {:ok, data}
1079     end
1080   end
1081
1082   def prepare_outgoing(%{"type" => "Reject"} = data) do
1083     with follow_activity <- Activity.normalize(data["object"]) do
1084       object = %{
1085         "actor" => follow_activity.actor,
1086         "object" => follow_activity.data["object"],
1087         "id" => follow_activity.data["id"],
1088         "type" => "Follow"
1089       }
1090
1091       data =
1092         data
1093         |> Map.put("object", object)
1094         |> Map.merge(Utils.make_json_ld_header())
1095
1096       {:ok, data}
1097     end
1098   end
1099
1100   def prepare_outgoing(%{"type" => _type} = data) do
1101     data =
1102       data
1103       |> strip_internal_fields
1104       |> maybe_fix_object_url
1105       |> Map.merge(Utils.make_json_ld_header())
1106
1107     {:ok, data}
1108   end
1109
1110   def maybe_fix_object_url(%{"object" => object} = data) when is_binary(object) do
1111     with false <- String.starts_with?(object, "http"),
1112          {:fetch, {:ok, relative_object}} <- {:fetch, get_obj_helper(object)},
1113          %{data: %{"external_url" => external_url}} when not is_nil(external_url) <-
1114            relative_object do
1115       Map.put(data, "object", external_url)
1116     else
1117       {:fetch, e} ->
1118         Logger.error("Couldn't fetch #{object} #{inspect(e)}")
1119         data
1120
1121       _ ->
1122         data
1123     end
1124   end
1125
1126   def maybe_fix_object_url(data), do: data
1127
1128   def add_hashtags(object) do
1129     tags =
1130       (object["tag"] || [])
1131       |> Enum.map(fn
1132         # Expand internal representation tags into AS2 tags.
1133         tag when is_binary(tag) ->
1134           %{
1135             "href" => Pleroma.Web.Endpoint.url() <> "/tags/#{tag}",
1136             "name" => "##{tag}",
1137             "type" => "Hashtag"
1138           }
1139
1140         # Do not process tags which are already AS2 tag objects.
1141         tag when is_map(tag) ->
1142           tag
1143       end)
1144
1145     Map.put(object, "tag", tags)
1146   end
1147
1148   def add_mention_tags(object) do
1149     {enabled_receivers, disabled_receivers} = Utils.get_notified_from_object(object)
1150     potential_receivers = enabled_receivers ++ disabled_receivers
1151     mentions = Enum.map(potential_receivers, &build_mention_tag/1)
1152
1153     tags = object["tag"] || []
1154     Map.put(object, "tag", tags ++ mentions)
1155   end
1156
1157   defp build_mention_tag(%{ap_id: ap_id, nickname: nickname} = _) do
1158     %{"type" => "Mention", "href" => ap_id, "name" => "@#{nickname}"}
1159   end
1160
1161   def take_emoji_tags(%User{emoji: emoji}) do
1162     emoji
1163     |> Map.to_list()
1164     |> Enum.map(&build_emoji_tag/1)
1165   end
1166
1167   # TODO: we should probably send mtime instead of unix epoch time for updated
1168   def add_emoji_tags(%{"emoji" => emoji} = object) do
1169     tags = object["tag"] || []
1170
1171     out = Enum.map(emoji, &build_emoji_tag/1)
1172
1173     Map.put(object, "tag", tags ++ out)
1174   end
1175
1176   def add_emoji_tags(object), do: object
1177
1178   defp build_emoji_tag({name, url}) do
1179     %{
1180       "icon" => %{"url" => url, "type" => "Image"},
1181       "name" => ":" <> name <> ":",
1182       "type" => "Emoji",
1183       "updated" => "1970-01-01T00:00:00Z",
1184       "id" => url
1185     }
1186   end
1187
1188   def set_conversation(object) do
1189     Map.put(object, "conversation", object["context"])
1190   end
1191
1192   def set_sensitive(object) do
1193     tags = object["tag"] || []
1194     Map.put(object, "sensitive", "nsfw" in tags)
1195   end
1196
1197   def set_type(%{"type" => "Answer"} = object) do
1198     Map.put(object, "type", "Note")
1199   end
1200
1201   def set_type(object), do: object
1202
1203   def add_attributed_to(object) do
1204     attributed_to = object["attributedTo"] || object["actor"]
1205     Map.put(object, "attributedTo", attributed_to)
1206   end
1207
1208   def prepare_attachments(object) do
1209     attachments =
1210       (object["attachment"] || [])
1211       |> Enum.map(fn data ->
1212         [%{"mediaType" => media_type, "href" => href} | _] = data["url"]
1213         %{"url" => href, "mediaType" => media_type, "name" => data["name"], "type" => "Document"}
1214       end)
1215
1216     Map.put(object, "attachment", attachments)
1217   end
1218
1219   def strip_internal_fields(object) do
1220     object
1221     |> Map.drop(Pleroma.Constants.object_internal_fields())
1222   end
1223
1224   defp strip_internal_tags(%{"tag" => tags} = object) do
1225     tags = Enum.filter(tags, fn x -> is_map(x) end)
1226
1227     Map.put(object, "tag", tags)
1228   end
1229
1230   defp strip_internal_tags(object), do: object
1231
1232   def perform(:user_upgrade, user) do
1233     # we pass a fake user so that the followers collection is stripped away
1234     old_follower_address = User.ap_followers(%User{nickname: user.nickname})
1235
1236     from(
1237       a in Activity,
1238       where: ^old_follower_address in a.recipients,
1239       update: [
1240         set: [
1241           recipients:
1242             fragment(
1243               "array_replace(?,?,?)",
1244               a.recipients,
1245               ^old_follower_address,
1246               ^user.follower_address
1247             )
1248         ]
1249       ]
1250     )
1251     |> Repo.update_all([])
1252   end
1253
1254   def upgrade_user_from_ap_id(ap_id) do
1255     with %User{local: false} = user <- User.get_cached_by_ap_id(ap_id),
1256          {:ok, data} <- ActivityPub.fetch_and_prepare_user_from_ap_id(ap_id),
1257          {:ok, user} <- update_user(user, data) do
1258       TransmogrifierWorker.enqueue("user_upgrade", %{"user_id" => user.id})
1259       {:ok, user}
1260     else
1261       %User{} = user -> {:ok, user}
1262       e -> e
1263     end
1264   end
1265
1266   defp update_user(user, data) do
1267     user
1268     |> User.remote_user_changeset(data)
1269     |> User.update_and_set_cache()
1270   end
1271
1272   def maybe_fix_user_url(%{"url" => url} = data) when is_map(url) do
1273     Map.put(data, "url", url["href"])
1274   end
1275
1276   def maybe_fix_user_url(data), do: data
1277
1278   def maybe_fix_user_object(data), do: maybe_fix_user_url(data)
1279
1280   defp ensure_context_presence(%{"context" => context} = data) when is_binary(context),
1281     do: {:ok, data}
1282
1283   defp ensure_context_presence(%{"object" => object} = data) when is_binary(object) do
1284     with %{data: %{"context" => context}} when is_binary(context) <- Object.normalize(object) do
1285       {:ok, Map.put(data, "context", context)}
1286     else
1287       _ ->
1288         {:error, :no_context}
1289     end
1290   end
1291
1292   defp ensure_context_presence(_) do
1293     {:error, :no_context}
1294   end
1295
1296   defp ensure_recipients_presence(%{"to" => [_ | _], "cc" => [_ | _]} = data),
1297     do: {:ok, data}
1298
1299   defp ensure_recipients_presence(%{"object" => object} = data) do
1300     case Object.normalize(object) do
1301       %{data: %{"actor" => actor}} ->
1302         data =
1303           data
1304           |> Map.put("to", [actor])
1305           |> Map.put("cc", data["cc"] || [])
1306
1307         {:ok, data}
1308
1309       nil ->
1310         {:error, :no_object}
1311
1312       _ ->
1313         {:error, :no_actor}
1314     end
1315   end
1316
1317   defp ensure_recipients_presence(_) do
1318     {:error, :no_object}
1319   end
1320 end