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   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.MastodonAPI.StatusView do
   6   use Pleroma.Web, :view
   7
   8   require Pleroma.Constants
   9
  10   alias Pleroma.Activity
  11   alias Pleroma.ActivityExpiration
  12   alias Pleroma.HTML
  13   alias Pleroma.Object
  14   alias Pleroma.Repo
  15   alias Pleroma.User
  16   alias Pleroma.UserRelationship
  17   alias Pleroma.Web.CommonAPI
  18   alias Pleroma.Web.CommonAPI.Utils
  19   alias Pleroma.Web.MastodonAPI.AccountView
  20   alias Pleroma.Web.MastodonAPI.PollView
  21   alias Pleroma.Web.MastodonAPI.StatusView
  22   alias Pleroma.Web.MediaProxy
  23
  24   import Pleroma.Web.ActivityPub.Visibility, only: [get_visibility: 1, visible_for_user?: 2]
  25
  26   # TODO: Add cached version.
  27   defp get_replied_to_activities([]), do: %{}
  28
  29   defp get_replied_to_activities(activities) do
  30     activities
  31     |> Enum.map(fn
  32       %{data: %{"type" => "Create"}} = activity ->
  33         object = Object.normalize(activity)
  34         object && object.data["inReplyTo"] != "" && object.data["inReplyTo"]
  35
  36       _ ->
  37         nil
  38     end)
  39     |> Enum.filter(& &1)
  40     |> Activity.create_by_object_ap_id_with_object()
  41     |> Repo.all()
  42     |> Enum.reduce(%{}, fn activity, acc ->
  43       object = Object.normalize(activity)
  44       if object, do: Map.put(acc, object.data["id"], activity), else: acc
  45     end)
  46   end
  47
  48   def get_user(ap_id, fake_record_fallback \\ true) do
  49     cond do
  50       user = User.get_cached_by_ap_id(ap_id) ->
  51         user
  52
  53       user = User.get_by_guessed_nickname(ap_id) ->
  54         user
  55
  56       fake_record_fallback ->
  57         # TODO: refactor (fake records is never a good idea)
  58         User.error_user(ap_id)
  59
  60       true ->
  61         nil
  62     end
  63   end
  64
  65   defp get_context_id(%{data: %{"context_id" => context_id}}) when not is_nil(context_id),
  66     do: context_id
  67
  68   defp get_context_id(%{data: %{"context" => context}}) when is_binary(context),
  69     do: Utils.context_to_conversation_id(context)
  70
  71   defp get_context_id(_), do: nil
  72
  73   defp reblogged?(activity, user) do
  74     object = Object.normalize(activity) || %{}
  75     present?(user && user.ap_id in (object.data["announcements"] || []))
  76   end
  77
  78   def render("index.json", opts) do
  79     reading_user = opts[:for]
  80
  81     # To do: check AdminAPIControllerTest on the reasons behind nil activities in the list
  82     activities = Enum.filter(opts.activities, & &1)
  83     replied_to_activities = get_replied_to_activities(activities)
  84
  85     parent_activities =
  86       activities
  87       |> Enum.filter(&(&1.data["type"] == "Announce" && &1.data["object"]))
  88       |> Enum.map(&Object.normalize(&1).data["id"])
  89       |> Activity.create_by_object_ap_id()
  90       |> Activity.with_preloaded_object(:left)
  91       |> Activity.with_preloaded_bookmark(reading_user)
  92       |> Activity.with_set_thread_muted_field(reading_user)
  93       |> Repo.all()
  94
  95     relationships_opt =
  96       cond do
  97         Map.has_key?(opts, :relationships) ->
  98           opts[:relationships]
  99
 100         is_nil(reading_user) ->
 101           UserRelationship.view_relationships_option(nil, [])
 102
 103         true ->
 104           # Note: unresolved users are filtered out
 105           actors =
 106             (activities ++ parent_activities)
 107             |> Enum.map(&get_user(&1.data["actor"], false))
 108             |> Enum.filter(& &1)
 109
 110           UserRelationship.view_relationships_option(reading_user, actors, subset: :source_mutes)
 111       end
 112
 113     opts =
 114       opts
 115       |> Map.put(:replied_to_activities, replied_to_activities)
 116       |> Map.put(:parent_activities, parent_activities)
 117       |> Map.put(:relationships, relationships_opt)
 118
 119     safe_render_many(activities, StatusView, "show.json", opts)
 120   end
 121
 122   def render(
 123         "show.json",
 124         %{activity: %{data: %{"type" => "Announce", "object" => _object}} = activity} = opts
 125       ) do
 126     user = get_user(activity.data["actor"])
 127     created_at = Utils.to_masto_date(activity.data["published"])
 128     activity_object = Object.normalize(activity)
 129
 130     reblogged_parent_activity =
 131       if opts[:parent_activities] do
 132         Activity.Queries.find_by_object_ap_id(
 133           opts[:parent_activities],
 134           activity_object.data["id"]
 135         )
 136       else
 137         Activity.create_by_object_ap_id(activity_object.data["id"])
 138         |> Activity.with_preloaded_bookmark(opts[:for])
 139         |> Activity.with_set_thread_muted_field(opts[:for])
 140         |> Repo.one()
 141       end
 142
 143     reblog_rendering_opts = Map.put(opts, :activity, reblogged_parent_activity)
 144     reblogged = render("show.json", reblog_rendering_opts)
 145
 146     favorited = opts[:for] && opts[:for].ap_id in (activity_object.data["likes"] || [])
 147
 148     bookmarked = Activity.get_bookmark(reblogged_parent_activity, opts[:for]) != nil
 149
 150     mentions =
 151       activity.recipients
 152       |> Enum.map(fn ap_id -> User.get_cached_by_ap_id(ap_id) end)
 153       |> Enum.filter(& &1)
 154       |> Enum.map(fn user -> AccountView.render("mention.json", %{user: user}) end)
 155
 156     %{
 157       id: to_string(activity.id),
 158       uri: activity_object.data["id"],
 159       url: activity_object.data["id"],
 160       account:
 161         AccountView.render("show.json", %{
 162           user: user,
 163           for: opts[:for]
 164         }),
 165       in_reply_to_id: nil,
 166       in_reply_to_account_id: nil,
 167       reblog: reblogged,
 168       content: reblogged[:content] || "",
 169       created_at: created_at,
 170       reblogs_count: 0,
 171       replies_count: 0,
 172       favourites_count: 0,
 173       reblogged: reblogged?(reblogged_parent_activity, opts[:for]),
 174       favourited: present?(favorited),
 175       bookmarked: present?(bookmarked),
 176       muted: false,
 177       pinned: pinned?(activity, user),
 178       sensitive: false,
 179       spoiler_text: "",
 180       visibility: get_visibility(activity),
 181       media_attachments: reblogged[:media_attachments] || [],
 182       mentions: mentions,
 183       tags: reblogged[:tags] || [],
 184       application: %{
 185         name: "Web",
 186         website: nil
 187       },
 188       language: nil,
 189       emojis: [],
 190       pleroma: %{
 191         local: activity.local
 192       }
 193     }
 194   end
 195
 196   def render("show.json", %{activity: %{data: %{"object" => _object}} = activity} = opts) do
 197     object = Object.normalize(activity)
 198
 199     user = get_user(activity.data["actor"])
 200     user_follower_address = user.follower_address
 201
 202     like_count = object.data["like_count"] || 0
 203     announcement_count = object.data["announcement_count"] || 0
 204
 205     tags = object.data["tag"] || []
 206     sensitive = object.data["sensitive"] || Enum.member?(tags, "nsfw")
 207
 208     tag_mentions =
 209       tags
 210       |> Enum.filter(fn tag -> is_map(tag) and tag["type"] == "Mention" end)
 211       |> Enum.map(fn tag -> tag["href"] end)
 212
 213     mentions =
 214       (object.data["to"] ++ tag_mentions)
 215       |> Enum.uniq()
 216       |> Enum.map(fn
 217         Pleroma.Constants.as_public() -> nil
 218         ^user_follower_address -> nil
 219         ap_id -> User.get_cached_by_ap_id(ap_id)
 220       end)
 221       |> Enum.filter(& &1)
 222       |> Enum.map(fn user -> AccountView.render("mention.json", %{user: user}) end)
 223
 224     favorited = opts[:for] && opts[:for].ap_id in (object.data["likes"] || [])
 225
 226     bookmarked = Activity.get_bookmark(activity, opts[:for]) != nil
 227
 228     client_posted_this_activity = opts[:for] && user.id == opts[:for].id
 229
 230     expires_at =
 231       with true <- client_posted_this_activity,
 232            %ActivityExpiration{scheduled_at: scheduled_at} <-
 233              ActivityExpiration.get_by_activity_id(activity.id) do
 234         scheduled_at
 235       else
 236         _ -> nil
 237       end
 238
 239     thread_muted? =
 240       cond do
 241         is_nil(opts[:for]) -> false
 242         is_boolean(activity.thread_muted?) -> activity.thread_muted?
 243         true -> CommonAPI.thread_muted?(opts[:for], activity)
 244       end
 245
 246     attachment_data = object.data["attachment"] || []
 247     attachments = render_many(attachment_data, StatusView, "attachment.json", as: :attachment)
 248
 249     created_at = Utils.to_masto_date(object.data["published"])
 250
 251     reply_to = get_reply_to(activity, opts)
 252
 253     reply_to_user = reply_to && get_user(reply_to.data["actor"])
 254
 255     content =
 256       object
 257       |> render_content()
 258
 259     content_html =
 260       content
 261       |> HTML.get_cached_scrubbed_html_for_activity(
 262         User.html_filter_policy(opts[:for]),
 263         activity,
 264         "mastoapi:content"
 265       )
 266
 267     content_plaintext =
 268       content
 269       |> HTML.get_cached_stripped_html_for_activity(
 270         activity,
 271         "mastoapi:content"
 272       )
 273
 274     summary = object.data["summary"] || ""
 275
 276     card = render("card.json", Pleroma.Web.RichMedia.Helpers.fetch_data_for_activity(activity))
 277
 278     url =
 279       if user.local do
 280         Pleroma.Web.Router.Helpers.o_status_url(Pleroma.Web.Endpoint, :notice, activity)
 281       else
 282         object.data["url"] || object.data["external_url"] || object.data["id"]
 283       end
 284
 285     direct_conversation_id =
 286       with {_, nil} <- {:direct_conversation_id, opts[:direct_conversation_id]},
 287            {_, true} <- {:include_id, opts[:with_direct_conversation_id]},
 288            {_, %User{} = for_user} <- {:for_user, opts[:for]} do
 289         Activity.direct_conversation_id(activity, for_user)
 290       else
 291         {:direct_conversation_id, participation_id} when is_integer(participation_id) ->
 292           participation_id
 293
 294         _e ->
 295           nil
 296       end
 297
 298     emoji_reactions =
 299       with %{data: %{"reactions" => emoji_reactions}} <- object do
 300         Enum.map(emoji_reactions, fn [emoji, users] ->
 301           %{
 302             name: emoji,
 303             count: length(users),
 304             me: !!(opts[:for] && opts[:for].ap_id in users)
 305           }
 306         end)
 307       else
 308         _ -> []
 309       end
 310
 311     # Status muted state (would do 1 request per status unless user mutes are preloaded)
 312     muted =
 313       thread_muted? ||
 314         UserRelationship.exists?(
 315           get_in(opts, [:relationships, :user_relationships]),
 316           :mute,
 317           opts[:for],
 318           user,
 319           fn for_user, user -> User.mutes?(for_user, user) end
 320         )
 321
 322     %{
 323       id: to_string(activity.id),
 324       uri: object.data["id"],
 325       url: url,
 326       account:
 327         AccountView.render("show.json", %{
 328           user: user,
 329           for: opts[:for]
 330         }),
 331       in_reply_to_id: reply_to && to_string(reply_to.id),
 332       in_reply_to_account_id: reply_to_user && to_string(reply_to_user.id),
 333       reblog: nil,
 334       card: card,
 335       content: content_html,
 336       created_at: created_at,
 337       reblogs_count: announcement_count,
 338       replies_count: object.data["repliesCount"] || 0,
 339       favourites_count: like_count,
 340       reblogged: reblogged?(activity, opts[:for]),
 341       favourited: present?(favorited),
 342       bookmarked: present?(bookmarked),
 343       muted: muted,
 344       pinned: pinned?(activity, user),
 345       sensitive: sensitive,
 346       spoiler_text: summary,
 347       visibility: get_visibility(object),
 348       media_attachments: attachments,
 349       poll: render(PollView, "show.json", object: object, for: opts[:for]),
 350       mentions: mentions,
 351       tags: build_tags(tags),
 352       application: %{
 353         name: "Web",
 354         website: nil
 355       },
 356       language: nil,
 357       emojis: build_emojis(object.data["emoji"]),
 358       pleroma: %{
 359         local: activity.local,
 360         conversation_id: get_context_id(activity),
 361         in_reply_to_account_acct: reply_to_user && reply_to_user.nickname,
 362         content: %{"text/plain" => content_plaintext},
 363         spoiler_text: %{"text/plain" => summary},
 364         expires_at: expires_at,
 365         direct_conversation_id: direct_conversation_id,
 366         thread_muted: thread_muted?,
 367         emoji_reactions: emoji_reactions,
 368         parent_visible: visible_for_user?(reply_to, opts[:for])
 369       }
 370     }
 371   end
 372
 373   def render("show.json", _) do
 374     nil
 375   end
 376
 377   def render("card.json", %{rich_media: rich_media, page_url: page_url}) do
 378     page_url_data = URI.parse(page_url)
 379
 380     page_url_data =
 381       if is_binary(rich_media["url"]) do
 382         URI.merge(page_url_data, URI.parse(rich_media["url"]))
 383       else
 384         page_url_data
 385       end
 386
 387     page_url = page_url_data |> to_string
 388
 389     image_url =
 390       if is_binary(rich_media["image"]) do
 391         URI.merge(page_url_data, URI.parse(rich_media["image"]))
 392         |> to_string
 393       end
 394
 395     %{
 396       type: "link",
 397       provider_name: page_url_data.host,
 398       provider_url: page_url_data.scheme <> "://" <> page_url_data.host,
 399       url: page_url,
 400       image: image_url |> MediaProxy.url(),
 401       title: rich_media["title"] || "",
 402       description: rich_media["description"] || "",
 403       pleroma: %{
 404         opengraph: rich_media
 405       }
 406     }
 407   end
 408
 409   def render("card.json", _), do: nil
 410
 411   def render("attachment.json", %{attachment: attachment}) do
 412     [attachment_url | _] = attachment["url"]
 413     media_type = attachment_url["mediaType"] || attachment_url["mimeType"] || "image"
 414     href = attachment_url["href"] |> MediaProxy.url()
 415
 416     type =
 417       cond do
 418         String.contains?(media_type, "image") -> "image"
 419         String.contains?(media_type, "video") -> "video"
 420         String.contains?(media_type, "audio") -> "audio"
 421         true -> "unknown"
 422       end
 423
 424     <<hash_id::signed-32, _rest::binary>> = :crypto.hash(:md5, href)
 425
 426     %{
 427       id: to_string(attachment["id"] || hash_id),
 428       url: href,
 429       remote_url: href,
 430       preview_url: href,
 431       text_url: href,
 432       type: type,
 433       description: attachment["name"],
 434       pleroma: %{mime_type: media_type}
 435     }
 436   end
 437
 438   def render("context.json", %{activity: activity, activities: activities, user: user}) do
 439     %{ancestors: ancestors, descendants: descendants} =
 440       activities
 441       |> Enum.reverse()
 442       |> Enum.group_by(fn %{id: id} -> if id < activity.id, do: :ancestors, else: :descendants end)
 443       |> Map.put_new(:ancestors, [])
 444       |> Map.put_new(:descendants, [])
 445
 446     %{
 447       ancestors: render("index.json", for: user, activities: ancestors, as: :activity),
 448       descendants: render("index.json", for: user, activities: descendants, as: :activity)
 449     }
 450   end
 451
 452   def get_reply_to(activity, %{replied_to_activities: replied_to_activities}) do
 453     object = Object.normalize(activity)
 454
 455     with nil <- replied_to_activities[object.data["inReplyTo"]] do
 456       # If user didn't participate in the thread
 457       Activity.get_in_reply_to_activity(activity)
 458     end
 459   end
 460
 461   def get_reply_to(%{data: %{"object" => _object}} = activity, _) do
 462     object = Object.normalize(activity)
 463
 464     if object.data["inReplyTo"] && object.data["inReplyTo"] != "" do
 465       Activity.get_create_by_object_ap_id(object.data["inReplyTo"])
 466     else
 467       nil
 468     end
 469   end
 470
 471   def render_content(%{data: %{"type" => object_type}} = object)
 472       when object_type in ["Video", "Event", "Audio"] do
 473     with name when not is_nil(name) and name != "" <- object.data["name"] do
 474       "<p><a href=\"#{object.data["id"]}\">#{name}</a></p>#{object.data["content"]}"
 475     else
 476       _ -> object.data["content"] || ""
 477     end
 478   end
 479
 480   def render_content(%{data: %{"type" => object_type}} = object)
 481       when object_type in ["Article", "Page"] do
 482     with summary when not is_nil(summary) and summary != "" <- object.data["name"],
 483          url when is_bitstring(url) <- object.data["url"] do
 484       "<p><a href=\"#{url}\">#{summary}</a></p>#{object.data["content"]}"
 485     else
 486       _ -> object.data["content"] || ""
 487     end
 488   end
 489
 490   def render_content(object), do: object.data["content"] || ""
 491
 492   @doc """
 493   Builds a dictionary tags.
 494
 495   ## Examples
 496
 497   iex> Pleroma.Web.MastodonAPI.StatusView.build_tags(["fediverse", "nextcloud"])
 498   [{"name": "fediverse", "url": "/tag/fediverse"},
 499    {"name": "nextcloud", "url": "/tag/nextcloud"}]
 500
 501   """
 502   @spec build_tags(list(any())) :: list(map())
 503   def build_tags(object_tags) when is_list(object_tags) do
 504     object_tags
 505     |> Enum.filter(&is_binary/1)
 506     |> Enum.map(&%{name: &1, url: "/tag/#{URI.encode(&1)}"})
 507   end
 508
 509   def build_tags(_), do: []
 510
 511   @doc """
 512   Builds list emojis.
 513
 514   Arguments: `nil` or list tuple of name and url.
 515
 516   Returns list emojis.
 517
 518   ## Examples
 519
 520   iex> Pleroma.Web.MastodonAPI.StatusView.build_emojis([{"2hu", "corndog.png"}])
 521   [%{shortcode: "2hu", static_url: "corndog.png", url: "corndog.png", visible_in_picker: false}]
 522
 523   """
 524   @spec build_emojis(nil | list(tuple())) :: list(map())
 525   def build_emojis(nil), do: []
 526
 527   def build_emojis(emojis) do
 528     emojis
 529     |> Enum.map(fn {name, url} ->
 530       name = HTML.strip_tags(name)
 531
 532       url =
 533         url
 534         |> HTML.strip_tags()
 535         |> MediaProxy.url()
 536
 537       %{shortcode: name, url: url, static_url: url, visible_in_picker: false}
 538     end)
 539   end
 540
 541   defp present?(nil), do: false
 542   defp present?(false), do: false
 543   defp present?(_), do: true
 544
 545   defp pinned?(%Activity{id: id}, %User{pinned_activities: pinned_activities}),
 546     do: id in pinned_activities
 547 end