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   1 # Pleroma: A lightweight social networking server
   2 # Copyright © 2017-2019 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.Utils
  17   alias Pleroma.Web.ActivityPub.Visibility
  18   alias Pleroma.Web.Federator
  19   alias Pleroma.Workers.TransmogrifierWorker
  20
  21   import Ecto.Query
  22
  23   require Logger
  24   require Pleroma.Constants
  25
  26   @doc """
  27   Modifies an incoming AP object (mastodon format) to our internal format.
  28   """
  29   def fix_object(object, options \\ []) do
  30     object
  31     |> strip_internal_fields
  32     |> fix_actor
  33     |> fix_url
  34     |> fix_attachments
  35     |> fix_context
  36     |> fix_in_reply_to(options)
  37     |> fix_emoji
  38     |> fix_tag
  39     |> fix_content_map
  40     |> fix_addressing
  41     |> fix_summary
  42     |> fix_type(options)
  43   end
  44
  45   def fix_summary(%{"summary" => nil} = object) do
  46     Map.put(object, "summary", "")
  47   end
  48
  49   def fix_summary(%{"summary" => _} = object) do
  50     # summary is present, nothing to do
  51     object
  52   end
  53
  54   def fix_summary(object), do: Map.put(object, "summary", "")
  55
  56   def fix_addressing_list(map, field) do
  57     cond do
  58       is_binary(map[field]) ->
  59         Map.put(map, field, [map[field]])
  60
  61       is_nil(map[field]) ->
  62         Map.put(map, field, [])
  63
  64       true ->
  65         map
  66     end
  67   end
  68
  69   def fix_explicit_addressing(
  70         %{"to" => to, "cc" => cc} = object,
  71         explicit_mentions,
  72         follower_collection
  73       ) do
  74     explicit_to = Enum.filter(to, fn x -> x in explicit_mentions end)
  75
  76     explicit_cc = Enum.filter(to, fn x -> x not in explicit_mentions end)
  77
  78     final_cc =
  79       (cc ++ explicit_cc)
  80       |> Enum.reject(fn x -> String.ends_with?(x, "/followers") and x != follower_collection end)
  81       |> Enum.uniq()
  82
  83     object
  84     |> Map.put("to", explicit_to)
  85     |> Map.put("cc", final_cc)
  86   end
  87
  88   def fix_explicit_addressing(object, _explicit_mentions, _followers_collection), do: object
  89
  90   # if directMessage flag is set to true, leave the addressing alone
  91   def fix_explicit_addressing(%{"directMessage" => true} = object), do: object
  92
  93   def fix_explicit_addressing(object) do
  94     explicit_mentions = Utils.determine_explicit_mentions(object)
  95
  96     %User{follower_address: follower_collection} =
  97       object
  98       |> Containment.get_actor()
  99       |> User.get_cached_by_ap_id()
 100
 101     explicit_mentions =
 102       explicit_mentions ++
 103         [
 104           Pleroma.Constants.as_public(),
 105           follower_collection
 106         ]
 107
 108     fix_explicit_addressing(object, explicit_mentions, follower_collection)
 109   end
 110
 111   # if as:Public is addressed, then make sure the followers collection is also addressed
 112   # so that the activities will be delivered to local users.
 113   def fix_implicit_addressing(%{"to" => to, "cc" => cc} = object, followers_collection) do
 114     recipients = to ++ cc
 115
 116     if followers_collection not in recipients do
 117       cond do
 118         Pleroma.Constants.as_public() in cc ->
 119           to = to ++ [followers_collection]
 120           Map.put(object, "to", to)
 121
 122         Pleroma.Constants.as_public() in to ->
 123           cc = cc ++ [followers_collection]
 124           Map.put(object, "cc", cc)
 125
 126         true ->
 127           object
 128       end
 129     else
 130       object
 131     end
 132   end
 133
 134   def fix_implicit_addressing(object, _), do: object
 135
 136   def fix_addressing(object) do
 137     {:ok, %User{} = user} = User.get_or_fetch_by_ap_id(object["actor"])
 138     followers_collection = User.ap_followers(user)
 139
 140     object
 141     |> fix_addressing_list("to")
 142     |> fix_addressing_list("cc")
 143     |> fix_addressing_list("bto")
 144     |> fix_addressing_list("bcc")
 145     |> fix_explicit_addressing()
 146     |> fix_implicit_addressing(followers_collection)
 147   end
 148
 149   def fix_actor(%{"attributedTo" => actor} = object) do
 150     Map.put(object, "actor", Containment.get_actor(%{"actor" => actor}))
 151   end
 152
 153   def fix_in_reply_to(object, options \\ [])
 154
 155   def fix_in_reply_to(%{"inReplyTo" => in_reply_to} = object, options)
 156       when not is_nil(in_reply_to) do
 157     in_reply_to_id = prepare_in_reply_to(in_reply_to)
 158     object = Map.put(object, "inReplyToAtomUri", in_reply_to_id)
 159
 160     if Federator.allowed_incoming_reply_depth?(options[:depth]) do
 161       with {:ok, replied_object} <- get_obj_helper(in_reply_to_id, options),
 162            %Activity{} = _ <- Activity.get_create_by_object_ap_id(replied_object.data["id"]) do
 163         object
 164         |> Map.put("inReplyTo", replied_object.data["id"])
 165         |> Map.put("inReplyToAtomUri", object["inReplyToAtomUri"] || in_reply_to_id)
 166         |> Map.put("conversation", replied_object.data["context"] || object["conversation"])
 167         |> Map.put("context", replied_object.data["context"] || object["conversation"])
 168       else
 169         e ->
 170           Logger.error("Couldn't fetch #{inspect(in_reply_to_id)}, error: #{inspect(e)}")
 171           object
 172       end
 173     else
 174       object
 175     end
 176   end
 177
 178   def fix_in_reply_to(object, _options), do: object
 179
 180   defp prepare_in_reply_to(in_reply_to) do
 181     cond do
 182       is_bitstring(in_reply_to) ->
 183         in_reply_to
 184
 185       is_map(in_reply_to) && is_bitstring(in_reply_to["id"]) ->
 186         in_reply_to["id"]
 187
 188       is_list(in_reply_to) && is_bitstring(Enum.at(in_reply_to, 0)) ->
 189         Enum.at(in_reply_to, 0)
 190
 191       true ->
 192         ""
 193     end
 194   end
 195
 196   def fix_context(object) do
 197     context = object["context"] || object["conversation"] || Utils.generate_context_id()
 198
 199     object
 200     |> Map.put("context", context)
 201     |> Map.put("conversation", context)
 202   end
 203
 204   def fix_attachments(%{"attachment" => attachment} = object) when is_list(attachment) do
 205     attachments =
 206       Enum.map(attachment, fn data ->
 207         media_type = data["mediaType"] || data["mimeType"]
 208         href = data["url"] || data["href"]
 209         url = [%{"type" => "Link", "mediaType" => media_type, "href" => href}]
 210
 211         data
 212         |> Map.put("mediaType", media_type)
 213         |> Map.put("url", url)
 214       end)
 215
 216     Map.put(object, "attachment", attachments)
 217   end
 218
 219   def fix_attachments(%{"attachment" => attachment} = object) when is_map(attachment) do
 220     object
 221     |> Map.put("attachment", [attachment])
 222     |> fix_attachments()
 223   end
 224
 225   def fix_attachments(object), do: object
 226
 227   def fix_url(%{"url" => url} = object) when is_map(url) do
 228     Map.put(object, "url", url["href"])
 229   end
 230
 231   def fix_url(%{"type" => "Video", "url" => url} = object) when is_list(url) do
 232     first_element = Enum.at(url, 0)
 233
 234     link_element = Enum.find(url, fn x -> is_map(x) and x["mimeType"] == "text/html" end)
 235
 236     object
 237     |> Map.put("attachment", [first_element])
 238     |> Map.put("url", link_element["href"])
 239   end
 240
 241   def fix_url(%{"type" => object_type, "url" => url} = object)
 242       when object_type != "Video" and is_list(url) do
 243     first_element = Enum.at(url, 0)
 244
 245     url_string =
 246       cond do
 247         is_bitstring(first_element) -> first_element
 248         is_map(first_element) -> first_element["href"] || ""
 249         true -> ""
 250       end
 251
 252     Map.put(object, "url", url_string)
 253   end
 254
 255   def fix_url(object), do: object
 256
 257   def fix_emoji(%{"tag" => tags} = object) when is_list(tags) do
 258     emoji =
 259       tags
 260       |> Enum.filter(fn data -> data["type"] == "Emoji" and data["icon"] end)
 261       |> Enum.reduce(%{}, fn data, mapping ->
 262         name = String.trim(data["name"], ":")
 263
 264         Map.put(mapping, name, data["icon"]["url"])
 265       end)
 266
 267     # we merge mastodon and pleroma emoji into a single mapping, to allow for both wire formats
 268     emoji = Map.merge(object["emoji"] || %{}, emoji)
 269
 270     Map.put(object, "emoji", emoji)
 271   end
 272
 273   def fix_emoji(%{"tag" => %{"type" => "Emoji"} = tag} = object) do
 274     name = String.trim(tag["name"], ":")
 275     emoji = %{name => tag["icon"]["url"]}
 276
 277     Map.put(object, "emoji", emoji)
 278   end
 279
 280   def fix_emoji(object), do: object
 281
 282   def fix_tag(%{"tag" => tag} = object) when is_list(tag) do
 283     tags =
 284       tag
 285       |> Enum.filter(fn data -> data["type"] == "Hashtag" and data["name"] end)
 286       |> Enum.map(fn data -> String.slice(data["name"], 1..-1) end)
 287
 288     Map.put(object, "tag", tag ++ tags)
 289   end
 290
 291   def fix_tag(%{"tag" => %{"type" => "Hashtag", "name" => hashtag} = tag} = object) do
 292     combined = [tag, String.slice(hashtag, 1..-1)]
 293
 294     Map.put(object, "tag", combined)
 295   end
 296
 297   def fix_tag(%{"tag" => %{} = tag} = object), do: Map.put(object, "tag", [tag])
 298
 299   def fix_tag(object), do: object
 300
 301   # content map usually only has one language so this will do for now.
 302   def fix_content_map(%{"contentMap" => content_map} = object) do
 303     content_groups = Map.to_list(content_map)
 304     {_, content} = Enum.at(content_groups, 0)
 305
 306     Map.put(object, "content", content)
 307   end
 308
 309   def fix_content_map(object), do: object
 310
 311   def fix_type(object, options \\ [])
 312
 313   def fix_type(%{"inReplyTo" => reply_id, "name" => _} = object, options)
 314       when is_binary(reply_id) do
 315     with true <- Federator.allowed_incoming_reply_depth?(options[:depth]),
 316          {:ok, %{data: %{"type" => "Question"} = _} = _} <- get_obj_helper(reply_id, options) do
 317       Map.put(object, "type", "Answer")
 318     else
 319       _ -> object
 320     end
 321   end
 322
 323   def fix_type(object, _), do: object
 324
 325   defp mastodon_follow_hack(%{"id" => id, "actor" => follower_id}, followed) do
 326     with true <- id =~ "follows",
 327          %User{local: true} = follower <- User.get_cached_by_ap_id(follower_id),
 328          %Activity{} = activity <- Utils.fetch_latest_follow(follower, followed) do
 329       {:ok, activity}
 330     else
 331       _ -> {:error, nil}
 332     end
 333   end
 334
 335   defp mastodon_follow_hack(_, _), do: {:error, nil}
 336
 337   defp get_follow_activity(follow_object, followed) do
 338     with object_id when not is_nil(object_id) <- Utils.get_ap_id(follow_object),
 339          {_, %Activity{} = activity} <- {:activity, Activity.get_by_ap_id(object_id)} do
 340       {:ok, activity}
 341     else
 342       # Can't find the activity. This might a Mastodon 2.3 "Accept"
 343       {:activity, nil} ->
 344         mastodon_follow_hack(follow_object, followed)
 345
 346       _ ->
 347         {:error, nil}
 348     end
 349   end
 350
 351   # Reduce the object list to find the reported user.
 352   defp get_reported(objects) do
 353     Enum.reduce_while(objects, nil, fn ap_id, _ ->
 354       with %User{} = user <- User.get_cached_by_ap_id(ap_id) do
 355         {:halt, user}
 356       else
 357         _ -> {:cont, nil}
 358       end
 359     end)
 360   end
 361
 362   def handle_incoming(data, options \\ [])
 363
 364   # Flag objects are placed ahead of the ID check because Mastodon 2.8 and earlier send them
 365   # with nil ID.
 366   def handle_incoming(%{"type" => "Flag", "object" => objects, "actor" => actor} = data, _options) do
 367     with context <- data["context"] || Utils.generate_context_id(),
 368          content <- data["content"] || "",
 369          %User{} = actor <- User.get_cached_by_ap_id(actor),
 370          # Reduce the object list to find the reported user.
 371          %User{} = account <- get_reported(objects),
 372          # Remove the reported user from the object list.
 373          statuses <- Enum.filter(objects, fn ap_id -> ap_id != account.ap_id end) do
 374       %{
 375         actor: actor,
 376         context: context,
 377         account: account,
 378         statuses: statuses,
 379         content: content,
 380         additional: %{"cc" => [account.ap_id]}
 381       }
 382       |> ActivityPub.flag()
 383     end
 384   end
 385
 386   # disallow objects with bogus IDs
 387   def handle_incoming(%{"id" => nil}, _options), do: :error
 388   def handle_incoming(%{"id" => ""}, _options), do: :error
 389   # length of https:// = 8, should validate better, but good enough for now.
 390   def handle_incoming(%{"id" => id}, _options) when not (is_binary(id) and length(id) > 8),
 391     do: :error
 392
 393   # TODO: validate those with a Ecto scheme
 394   # - tags
 395   # - emoji
 396   def handle_incoming(
 397         %{"type" => "Create", "object" => %{"type" => objtype} = object} = data,
 398         options
 399       )
 400       when objtype in ["Article", "Note", "Video", "Page", "Question", "Answer"] do
 401     actor = Containment.get_actor(data)
 402
 403     data =
 404       Map.put(data, "actor", actor)
 405       |> fix_addressing
 406
 407     with nil <- Activity.get_create_by_object_ap_id(object["id"]),
 408          {:ok, %User{} = user} <- User.get_or_fetch_by_ap_id(data["actor"]) do
 409       options = Keyword.put(options, :depth, (options[:depth] || 0) + 1)
 410       object = fix_object(data["object"], options)
 411
 412       params = %{
 413         to: data["to"],
 414         object: object,
 415         actor: user,
 416         context: object["conversation"],
 417         local: false,
 418         published: data["published"],
 419         additional:
 420           Map.take(data, [
 421             "cc",
 422             "directMessage",
 423             "id"
 424           ])
 425       }
 426
 427       ActivityPub.create(params)
 428     else
 429       %Activity{} = activity -> {:ok, activity}
 430       _e -> :error
 431     end
 432   end
 433
 434   def handle_incoming(
 435         %{"type" => "Listen", "object" => %{"type" => "Audio"} = object} = data,
 436         options
 437       ) do
 438     actor = Containment.get_actor(data)
 439
 440     data =
 441       Map.put(data, "actor", actor)
 442       |> fix_addressing
 443
 444     with {:ok, %User{} = user} <- User.get_or_fetch_by_ap_id(data["actor"]) do
 445       options = Keyword.put(options, :depth, (options[:depth] || 0) + 1)
 446       object = fix_object(object, options)
 447
 448       params = %{
 449         to: data["to"],
 450         object: object,
 451         actor: user,
 452         context: nil,
 453         local: false,
 454         published: data["published"],
 455         additional: Map.take(data, ["cc", "id"])
 456       }
 457
 458       ActivityPub.listen(params)
 459     else
 460       _e -> :error
 461     end
 462   end
 463
 464   def handle_incoming(
 465         %{"type" => "Follow", "object" => followed, "actor" => follower, "id" => id} = data,
 466         _options
 467       ) do
 468     with %User{local: true} = followed <-
 469            User.get_cached_by_ap_id(Containment.get_actor(%{"actor" => followed})),
 470          {:ok, %User{} = follower} <-
 471            User.get_or_fetch_by_ap_id(Containment.get_actor(%{"actor" => follower})),
 472          {:ok, activity} <- ActivityPub.follow(follower, followed, id, false) do
 473       with deny_follow_blocked <- Pleroma.Config.get([:user, :deny_follow_blocked]),
 474            {_, false} <- {:user_blocked, User.blocks?(followed, follower) && deny_follow_blocked},
 475            {_, false} <- {:user_locked, User.locked?(followed)},
 476            {_, {:ok, follower}} <- {:follow, User.follow(follower, followed)},
 477            {_, {:ok, _}} <-
 478              {:follow_state_update, Utils.update_follow_state_for_all(activity, "accept")},
 479            {:ok, _relationship} <- FollowingRelationship.update(follower, followed, "accept") do
 480         ActivityPub.accept(%{
 481           to: [follower.ap_id],
 482           actor: followed,
 483           object: data,
 484           local: true
 485         })
 486       else
 487         {:user_blocked, true} ->
 488           {:ok, _} = Utils.update_follow_state_for_all(activity, "reject")
 489           {:ok, _relationship} = FollowingRelationship.update(follower, followed, "reject")
 490
 491           ActivityPub.reject(%{
 492             to: [follower.ap_id],
 493             actor: followed,
 494             object: data,
 495             local: true
 496           })
 497
 498         {:follow, {:error, _}} ->
 499           {:ok, _} = Utils.update_follow_state_for_all(activity, "reject")
 500           {:ok, _relationship} = FollowingRelationship.update(follower, followed, "reject")
 501
 502           ActivityPub.reject(%{
 503             to: [follower.ap_id],
 504             actor: followed,
 505             object: data,
 506             local: true
 507           })
 508
 509         {:user_locked, true} ->
 510           {:ok, _relationship} = FollowingRelationship.update(follower, followed, "pending")
 511           :noop
 512       end
 513
 514       {:ok, activity}
 515     else
 516       _e ->
 517         :error
 518     end
 519   end
 520
 521   def handle_incoming(
 522         %{"type" => "Accept", "object" => follow_object, "actor" => _actor, "id" => id} = data,
 523         _options
 524       ) do
 525     with actor <- Containment.get_actor(data),
 526          {:ok, %User{} = followed} <- User.get_or_fetch_by_ap_id(actor),
 527          {:ok, follow_activity} <- get_follow_activity(follow_object, followed),
 528          {:ok, follow_activity} <- Utils.update_follow_state_for_all(follow_activity, "accept"),
 529          %User{local: true} = follower <- User.get_cached_by_ap_id(follow_activity.data["actor"]),
 530          {:ok, _relationship} <- FollowingRelationship.update(follower, followed, "accept") do
 531       ActivityPub.accept(%{
 532         to: follow_activity.data["to"],
 533         type: "Accept",
 534         actor: followed,
 535         object: follow_activity.data["id"],
 536         local: false,
 537         activity_id: id
 538       })
 539     else
 540       _e -> :error
 541     end
 542   end
 543
 544   def handle_incoming(
 545         %{"type" => "Reject", "object" => follow_object, "actor" => _actor, "id" => id} = data,
 546         _options
 547       ) do
 548     with actor <- Containment.get_actor(data),
 549          {:ok, %User{} = followed} <- User.get_or_fetch_by_ap_id(actor),
 550          {:ok, follow_activity} <- get_follow_activity(follow_object, followed),
 551          {:ok, follow_activity} <- Utils.update_follow_state_for_all(follow_activity, "reject"),
 552          %User{local: true} = follower <- User.get_cached_by_ap_id(follow_activity.data["actor"]),
 553          {:ok, _relationship} <- FollowingRelationship.update(follower, followed, "reject"),
 554          {:ok, activity} <-
 555            ActivityPub.reject(%{
 556              to: follow_activity.data["to"],
 557              type: "Reject",
 558              actor: followed,
 559              object: follow_activity.data["id"],
 560              local: false,
 561              activity_id: id
 562            }) do
 563       {:ok, activity}
 564     else
 565       _e -> :error
 566     end
 567   end
 568
 569   @misskey_reactions %{
 570     "like" => "👍",
 571     "love" => "❤️",
 572     "laugh" => "😆",
 573     "hmm" => "🤔",
 574     "surprise" => "😮",
 575     "congrats" => "🎉",
 576     "angry" => "💢",
 577     "confused" => "😥",
 578     "rip" => "😇",
 579     "pudding" => "🍮",
 580     "star" => "⭐"
 581   }
 582
 583   @doc "Rewrite misskey likes into EmojiReactions"
 584   def handle_incoming(
 585         %{
 586           "type" => "Like",
 587           "_misskey_reaction" => reaction
 588         } = data,
 589         options
 590       ) do
 591     data
 592     |> Map.put("type", "EmojiReaction")
 593     |> Map.put("content", @misskey_reactions[reaction] || reaction)
 594     |> handle_incoming(options)
 595   end
 596
 597   def handle_incoming(
 598         %{"type" => "Like", "object" => object_id, "actor" => _actor, "id" => id} = data,
 599         _options
 600       ) do
 601     with actor <- Containment.get_actor(data),
 602          {:ok, %User{} = actor} <- User.get_or_fetch_by_ap_id(actor),
 603          {:ok, object} <- get_obj_helper(object_id),
 604          {:ok, activity, _object} <- ActivityPub.like(actor, object, id, false) do
 605       {:ok, activity}
 606     else
 607       _e -> :error
 608     end
 609   end
 610
 611   def handle_incoming(
 612         %{
 613           "type" => "EmojiReaction",
 614           "object" => object_id,
 615           "actor" => _actor,
 616           "id" => id,
 617           "content" => emoji
 618         } = data,
 619         _options
 620       ) do
 621     with actor <- Containment.get_actor(data),
 622          {:ok, %User{} = actor} <- User.get_or_fetch_by_ap_id(actor),
 623          {:ok, object} <- get_obj_helper(object_id),
 624          {:ok, activity, _object} <-
 625            ActivityPub.react_with_emoji(actor, object, emoji, activity_id: id, local: false) do
 626       {:ok, activity}
 627     else
 628       _e -> :error
 629     end
 630   end
 631
 632   def handle_incoming(
 633         %{"type" => "Announce", "object" => object_id, "actor" => _actor, "id" => id} = data,
 634         _options
 635       ) do
 636     with actor <- Containment.get_actor(data),
 637          {:ok, %User{} = actor} <- User.get_or_fetch_by_ap_id(actor),
 638          {:ok, object} <- get_embedded_obj_helper(object_id, actor),
 639          public <- Visibility.is_public?(data),
 640          {:ok, activity, _object} <- ActivityPub.announce(actor, object, id, false, public) do
 641       {:ok, activity}
 642     else
 643       _e -> :error
 644     end
 645   end
 646
 647   def handle_incoming(
 648         %{"type" => "Update", "object" => %{"type" => object_type} = object, "actor" => actor_id} =
 649           data,
 650         _options
 651       )
 652       when object_type in [
 653              "Person",
 654              "Application",
 655              "Service",
 656              "Organization"
 657            ] do
 658     with %User{ap_id: ^actor_id} = actor <- User.get_cached_by_ap_id(object["id"]) do
 659       {:ok, new_user_data} = ActivityPub.user_data_from_user_object(object)
 660
 661       locked = new_user_data[:locked] || false
 662       attachment = get_in(new_user_data, [:source_data, "attachment"]) || []
 663       invisible = new_user_data[:invisible] || false
 664
 665       fields =
 666         attachment
 667         |> Enum.filter(fn %{"type" => t} -> t == "PropertyValue" end)
 668         |> Enum.map(fn fields -> Map.take(fields, ["name", "value"]) end)
 669
 670       update_data =
 671         new_user_data
 672         |> Map.take([:avatar, :banner, :bio, :name])
 673         |> Map.put(:fields, fields)
 674         |> Map.put(:locked, locked)
 675         |> Map.put(:invisible, invisible)
 676
 677       actor
 678       |> User.upgrade_changeset(update_data, true)
 679       |> User.update_and_set_cache()
 680
 681       ActivityPub.update(%{
 682         local: false,
 683         to: data["to"] || [],
 684         cc: data["cc"] || [],
 685         object: object,
 686         actor: actor_id,
 687         activity_id: data["id"]
 688       })
 689     else
 690       e ->
 691         Logger.error(e)
 692         :error
 693     end
 694   end
 695
 696   # TODO: We presently assume that any actor on the same origin domain as the object being
 697   # deleted has the rights to delete that object.  A better way to validate whether or not
 698   # the object should be deleted is to refetch the object URI, which should return either
 699   # an error or a tombstone.  This would allow us to verify that a deletion actually took
 700   # place.
 701   def handle_incoming(
 702         %{"type" => "Delete", "object" => object_id, "actor" => actor, "id" => id} = data,
 703         _options
 704       ) do
 705     object_id = Utils.get_ap_id(object_id)
 706
 707     with actor <- Containment.get_actor(data),
 708          {:ok, %User{} = actor} <- User.get_or_fetch_by_ap_id(actor),
 709          {:ok, object} <- get_obj_helper(object_id),
 710          :ok <- Containment.contain_origin(actor.ap_id, object.data),
 711          {:ok, activity} <-
 712            ActivityPub.delete(object, local: false, activity_id: id, actor: actor.ap_id) do
 713       {:ok, activity}
 714     else
 715       nil ->
 716         case User.get_cached_by_ap_id(object_id) do
 717           %User{ap_id: ^actor} = user ->
 718             User.delete(user)
 719
 720           nil ->
 721             :error
 722         end
 723
 724       _e ->
 725         :error
 726     end
 727   end
 728
 729   def handle_incoming(
 730         %{
 731           "type" => "Undo",
 732           "object" => %{"type" => "Announce", "object" => object_id},
 733           "actor" => _actor,
 734           "id" => id
 735         } = data,
 736         _options
 737       ) do
 738     with actor <- Containment.get_actor(data),
 739          {:ok, %User{} = actor} <- User.get_or_fetch_by_ap_id(actor),
 740          {:ok, object} <- get_obj_helper(object_id),
 741          {:ok, activity, _} <- ActivityPub.unannounce(actor, object, id, false) do
 742       {:ok, activity}
 743     else
 744       _e -> :error
 745     end
 746   end
 747
 748   def handle_incoming(
 749         %{
 750           "type" => "Undo",
 751           "object" => %{"type" => "Follow", "object" => followed},
 752           "actor" => follower,
 753           "id" => id
 754         } = _data,
 755         _options
 756       ) do
 757     with %User{local: true} = followed <- User.get_cached_by_ap_id(followed),
 758          {:ok, %User{} = follower} <- User.get_or_fetch_by_ap_id(follower),
 759          {:ok, activity} <- ActivityPub.unfollow(follower, followed, id, false) do
 760       User.unfollow(follower, followed)
 761       {:ok, activity}
 762     else
 763       _e -> :error
 764     end
 765   end
 766
 767   def handle_incoming(
 768         %{
 769           "type" => "Undo",
 770           "object" => %{"type" => "EmojiReaction", "id" => reaction_activity_id},
 771           "actor" => _actor,
 772           "id" => id
 773         } = data,
 774         _options
 775       ) do
 776     with actor <- Containment.get_actor(data),
 777          {:ok, %User{} = actor} <- User.get_or_fetch_by_ap_id(actor),
 778          {:ok, activity, _} <-
 779            ActivityPub.unreact_with_emoji(actor, reaction_activity_id,
 780              activity_id: id,
 781              local: false
 782            ) do
 783       {:ok, activity}
 784     else
 785       _e -> :error
 786     end
 787   end
 788
 789   def handle_incoming(
 790         %{
 791           "type" => "Undo",
 792           "object" => %{"type" => "Block", "object" => blocked},
 793           "actor" => blocker,
 794           "id" => id
 795         } = _data,
 796         _options
 797       ) do
 798     with %User{local: true} = blocked <- User.get_cached_by_ap_id(blocked),
 799          {:ok, %User{} = blocker} <- User.get_or_fetch_by_ap_id(blocker),
 800          {:ok, activity} <- ActivityPub.unblock(blocker, blocked, id, false) do
 801       User.unblock(blocker, blocked)
 802       {:ok, activity}
 803     else
 804       _e -> :error
 805     end
 806   end
 807
 808   def handle_incoming(
 809         %{"type" => "Block", "object" => blocked, "actor" => blocker, "id" => id} = _data,
 810         _options
 811       ) do
 812     with %User{local: true} = blocked = User.get_cached_by_ap_id(blocked),
 813          {:ok, %User{} = blocker} = User.get_or_fetch_by_ap_id(blocker),
 814          {:ok, activity} <- ActivityPub.block(blocker, blocked, id, false) do
 815       User.unfollow(blocker, blocked)
 816       User.block(blocker, blocked)
 817       {:ok, activity}
 818     else
 819       _e -> :error
 820     end
 821   end
 822
 823   def handle_incoming(
 824         %{
 825           "type" => "Undo",
 826           "object" => %{"type" => "Like", "object" => object_id},
 827           "actor" => _actor,
 828           "id" => id
 829         } = data,
 830         _options
 831       ) do
 832     with actor <- Containment.get_actor(data),
 833          {:ok, %User{} = actor} <- User.get_or_fetch_by_ap_id(actor),
 834          {:ok, object} <- get_obj_helper(object_id),
 835          {:ok, activity, _, _} <- ActivityPub.unlike(actor, object, id, false) do
 836       {:ok, activity}
 837     else
 838       _e -> :error
 839     end
 840   end
 841
 842   # For Undos that don't have the complete object attached, try to find it in our database.
 843   def handle_incoming(
 844         %{
 845           "type" => "Undo",
 846           "object" => object
 847         } = activity,
 848         options
 849       )
 850       when is_binary(object) do
 851     with %Activity{data: data} <- Activity.get_by_ap_id(object) do
 852       activity
 853       |> Map.put("object", data)
 854       |> handle_incoming(options)
 855     else
 856       _e -> :error
 857     end
 858   end
 859
 860   def handle_incoming(_, _), do: :error
 861
 862   @spec get_obj_helper(String.t(), Keyword.t()) :: {:ok, Object.t()} | nil
 863   def get_obj_helper(id, options \\ []) do
 864     case Object.normalize(id, true, options) do
 865       %Object{} = object -> {:ok, object}
 866       _ -> nil
 867     end
 868   end
 869
 870   @spec get_embedded_obj_helper(String.t() | Object.t(), User.t()) :: {:ok, Object.t()} | nil
 871   def get_embedded_obj_helper(%{"attributedTo" => attributed_to, "id" => object_id} = data, %User{
 872         ap_id: ap_id
 873       })
 874       when attributed_to == ap_id do
 875     with {:ok, activity} <-
 876            handle_incoming(%{
 877              "type" => "Create",
 878              "to" => data["to"],
 879              "cc" => data["cc"],
 880              "actor" => attributed_to,
 881              "object" => data
 882            }) do
 883       {:ok, Object.normalize(activity)}
 884     else
 885       _ -> get_obj_helper(object_id)
 886     end
 887   end
 888
 889   def get_embedded_obj_helper(object_id, _) do
 890     get_obj_helper(object_id)
 891   end
 892
 893   def set_reply_to_uri(%{"inReplyTo" => in_reply_to} = object) when is_binary(in_reply_to) do
 894     with false <- String.starts_with?(in_reply_to, "http"),
 895          {:ok, %{data: replied_to_object}} <- get_obj_helper(in_reply_to) do
 896       Map.put(object, "inReplyTo", replied_to_object["external_url"] || in_reply_to)
 897     else
 898       _e -> object
 899     end
 900   end
 901
 902   def set_reply_to_uri(obj), do: obj
 903
 904   # Prepares the object of an outgoing create activity.
 905   def prepare_object(object) do
 906     object
 907     |> set_sensitive
 908     |> add_hashtags
 909     |> add_mention_tags
 910     |> add_emoji_tags
 911     |> add_attributed_to
 912     |> prepare_attachments
 913     |> set_conversation
 914     |> set_reply_to_uri
 915     |> strip_internal_fields
 916     |> strip_internal_tags
 917     |> set_type
 918   end
 919
 920   #  @doc
 921   #  """
 922   #  internal -> Mastodon
 923   #  """
 924
 925   def prepare_outgoing(%{"type" => activity_type, "object" => object_id} = data)
 926       when activity_type in ["Create", "Listen"] do
 927     object =
 928       object_id
 929       |> Object.normalize()
 930       |> Map.get(:data)
 931       |> prepare_object
 932
 933     data =
 934       data
 935       |> Map.put("object", object)
 936       |> Map.merge(Utils.make_json_ld_header())
 937       |> Map.delete("bcc")
 938
 939     {:ok, data}
 940   end
 941
 942   def prepare_outgoing(%{"type" => "Announce", "actor" => ap_id, "object" => object_id} = data) do
 943     object =
 944       object_id
 945       |> Object.normalize()
 946
 947     data =
 948       if Visibility.is_private?(object) && object.data["actor"] == ap_id do
 949         data |> Map.put("object", object |> Map.get(:data) |> prepare_object)
 950       else
 951         data |> maybe_fix_object_url
 952       end
 953
 954     data =
 955       data
 956       |> strip_internal_fields
 957       |> Map.merge(Utils.make_json_ld_header())
 958       |> Map.delete("bcc")
 959
 960     {:ok, data}
 961   end
 962
 963   # Mastodon Accept/Reject requires a non-normalized object containing the actor URIs,
 964   # because of course it does.
 965   def prepare_outgoing(%{"type" => "Accept"} = data) do
 966     with follow_activity <- Activity.normalize(data["object"]) do
 967       object = %{
 968         "actor" => follow_activity.actor,
 969         "object" => follow_activity.data["object"],
 970         "id" => follow_activity.data["id"],
 971         "type" => "Follow"
 972       }
 973
 974       data =
 975         data
 976         |> Map.put("object", object)
 977         |> Map.merge(Utils.make_json_ld_header())
 978
 979       {:ok, data}
 980     end
 981   end
 982
 983   def prepare_outgoing(%{"type" => "Reject"} = data) do
 984     with follow_activity <- Activity.normalize(data["object"]) do
 985       object = %{
 986         "actor" => follow_activity.actor,
 987         "object" => follow_activity.data["object"],
 988         "id" => follow_activity.data["id"],
 989         "type" => "Follow"
 990       }
 991
 992       data =
 993         data
 994         |> Map.put("object", object)
 995         |> Map.merge(Utils.make_json_ld_header())
 996
 997       {:ok, data}
 998     end
 999   end
1000
1001   def prepare_outgoing(%{"type" => _type} = data) do
1002     data =
1003       data
1004       |> strip_internal_fields
1005       |> maybe_fix_object_url
1006       |> Map.merge(Utils.make_json_ld_header())
1007
1008     {:ok, data}
1009   end
1010
1011   def maybe_fix_object_url(%{"object" => object} = data) when is_binary(object) do
1012     with false <- String.starts_with?(object, "http"),
1013          {:fetch, {:ok, relative_object}} <- {:fetch, get_obj_helper(object)},
1014          %{data: %{"external_url" => external_url}} when not is_nil(external_url) <-
1015            relative_object do
1016       Map.put(data, "object", external_url)
1017     else
1018       {:fetch, e} ->
1019         Logger.error("Couldn't fetch #{object} #{inspect(e)}")
1020         data
1021
1022       _ ->
1023         data
1024     end
1025   end
1026
1027   def maybe_fix_object_url(data), do: data
1028
1029   def add_hashtags(object) do
1030     tags =
1031       (object["tag"] || [])
1032       |> Enum.map(fn
1033         # Expand internal representation tags into AS2 tags.
1034         tag when is_binary(tag) ->
1035           %{
1036             "href" => Pleroma.Web.Endpoint.url() <> "/tags/#{tag}",
1037             "name" => "##{tag}",
1038             "type" => "Hashtag"
1039           }
1040
1041         # Do not process tags which are already AS2 tag objects.
1042         tag when is_map(tag) ->
1043           tag
1044       end)
1045
1046     Map.put(object, "tag", tags)
1047   end
1048
1049   def add_mention_tags(object) do
1050     mentions =
1051       object
1052       |> Utils.get_notified_from_object()
1053       |> Enum.map(&build_mention_tag/1)
1054
1055     tags = object["tag"] || []
1056
1057     Map.put(object, "tag", tags ++ mentions)
1058   end
1059
1060   defp build_mention_tag(%{ap_id: ap_id, nickname: nickname} = _) do
1061     %{"type" => "Mention", "href" => ap_id, "name" => "@#{nickname}"}
1062   end
1063
1064   def take_emoji_tags(%User{emoji: emoji}) do
1065     emoji
1066     |> Enum.flat_map(&Map.to_list/1)
1067     |> Enum.map(&build_emoji_tag/1)
1068   end
1069
1070   # TODO: we should probably send mtime instead of unix epoch time for updated
1071   def add_emoji_tags(%{"emoji" => emoji} = object) do
1072     tags = object["tag"] || []
1073
1074     out = Enum.map(emoji, &build_emoji_tag/1)
1075
1076     Map.put(object, "tag", tags ++ out)
1077   end
1078
1079   def add_emoji_tags(object), do: object
1080
1081   defp build_emoji_tag({name, url}) do
1082     %{
1083       "icon" => %{"url" => url, "type" => "Image"},
1084       "name" => ":" <> name <> ":",
1085       "type" => "Emoji",
1086       "updated" => "1970-01-01T00:00:00Z",
1087       "id" => url
1088     }
1089   end
1090
1091   def set_conversation(object) do
1092     Map.put(object, "conversation", object["context"])
1093   end
1094
1095   def set_sensitive(object) do
1096     tags = object["tag"] || []
1097     Map.put(object, "sensitive", "nsfw" in tags)
1098   end
1099
1100   def set_type(%{"type" => "Answer"} = object) do
1101     Map.put(object, "type", "Note")
1102   end
1103
1104   def set_type(object), do: object
1105
1106   def add_attributed_to(object) do
1107     attributed_to = object["attributedTo"] || object["actor"]
1108     Map.put(object, "attributedTo", attributed_to)
1109   end
1110
1111   def prepare_attachments(object) do
1112     attachments =
1113       (object["attachment"] || [])
1114       |> Enum.map(fn data ->
1115         [%{"mediaType" => media_type, "href" => href} | _] = data["url"]
1116         %{"url" => href, "mediaType" => media_type, "name" => data["name"], "type" => "Document"}
1117       end)
1118
1119     Map.put(object, "attachment", attachments)
1120   end
1121
1122   def strip_internal_fields(object) do
1123     object
1124     |> Map.drop(Pleroma.Constants.object_internal_fields())
1125   end
1126
1127   defp strip_internal_tags(%{"tag" => tags} = object) do
1128     tags = Enum.filter(tags, fn x -> is_map(x) end)
1129
1130     Map.put(object, "tag", tags)
1131   end
1132
1133   defp strip_internal_tags(object), do: object
1134
1135   def perform(:user_upgrade, user) do
1136     # we pass a fake user so that the followers collection is stripped away
1137     old_follower_address = User.ap_followers(%User{nickname: user.nickname})
1138
1139     from(
1140       a in Activity,
1141       where: ^old_follower_address in a.recipients,
1142       update: [
1143         set: [
1144           recipients:
1145             fragment(
1146               "array_replace(?,?,?)",
1147               a.recipients,
1148               ^old_follower_address,
1149               ^user.follower_address
1150             )
1151         ]
1152       ]
1153     )
1154     |> Repo.update_all([])
1155   end
1156
1157   def upgrade_user_from_ap_id(ap_id) do
1158     with %User{local: false} = user <- User.get_cached_by_ap_id(ap_id),
1159          {:ok, data} <- ActivityPub.fetch_and_prepare_user_from_ap_id(ap_id),
1160          already_ap <- User.ap_enabled?(user),
1161          {:ok, user} <- upgrade_user(user, data) do
1162       if not already_ap do
1163         TransmogrifierWorker.enqueue("user_upgrade", %{"user_id" => user.id})
1164       end
1165
1166       {:ok, user}
1167     else
1168       %User{} = user -> {:ok, user}
1169       e -> e
1170     end
1171   end
1172
1173   defp upgrade_user(user, data) do
1174     user
1175     |> User.upgrade_changeset(data, true)
1176     |> User.update_and_set_cache()
1177   end
1178
1179   def maybe_fix_user_url(%{"url" => url} = data) when is_map(url) do
1180     Map.put(data, "url", url["href"])
1181   end
1182
1183   def maybe_fix_user_url(data), do: data
1184
1185   def maybe_fix_user_object(data), do: maybe_fix_user_url(data)
1186 end