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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       text: opts[:with_source] && object.data["source"],
 337       created_at: created_at,
 338       reblogs_count: announcement_count,
 339       replies_count: object.data["repliesCount"] || 0,
 340       favourites_count: like_count,
 341       reblogged: reblogged?(activity, opts[:for]),
 342       favourited: present?(favorited),
 343       bookmarked: present?(bookmarked),
 344       muted: muted,
 345       pinned: pinned?(activity, user),
 346       sensitive: sensitive,
 347       spoiler_text: summary,
 348       visibility: get_visibility(object),
 349       media_attachments: attachments,
 350       poll: render(PollView, "show.json", object: object, for: opts[:for]),
 351       mentions: mentions,
 352       tags: build_tags(tags),
 353       application: %{
 354         name: "Web",
 355         website: nil
 356       },
 357       language: nil,
 358       emojis: build_emojis(object.data["emoji"]),
 359       pleroma: %{
 360         local: activity.local,
 361         conversation_id: get_context_id(activity),
 362         in_reply_to_account_acct: reply_to_user && reply_to_user.nickname,
 363         content: %{"text/plain" => content_plaintext},
 364         spoiler_text: %{"text/plain" => summary},
 365         expires_at: expires_at,
 366         direct_conversation_id: direct_conversation_id,
 367         thread_muted: thread_muted?,
 368         emoji_reactions: emoji_reactions,
 369         parent_visible: visible_for_user?(reply_to, opts[:for])
 370       }
 371     }
 372   end
 373
 374   def render("show.json", _) do
 375     nil
 376   end
 377
 378   def render("card.json", %{rich_media: rich_media, page_url: page_url}) do
 379     page_url_data = URI.parse(page_url)
 380
 381     page_url_data =
 382       if is_binary(rich_media["url"]) do
 383         URI.merge(page_url_data, URI.parse(rich_media["url"]))
 384       else
 385         page_url_data
 386       end
 387
 388     page_url = page_url_data |> to_string
 389
 390     image_url =
 391       if is_binary(rich_media["image"]) do
 392         URI.merge(page_url_data, URI.parse(rich_media["image"]))
 393         |> to_string
 394       end
 395
 396     %{
 397       type: "link",
 398       provider_name: page_url_data.host,
 399       provider_url: page_url_data.scheme <> "://" <> page_url_data.host,
 400       url: page_url,
 401       image: image_url |> MediaProxy.url(),
 402       title: rich_media["title"] || "",
 403       description: rich_media["description"] || "",
 404       pleroma: %{
 405         opengraph: rich_media
 406       }
 407     }
 408   end
 409
 410   def render("card.json", _), do: nil
 411
 412   def render("attachment.json", %{attachment: attachment}) do
 413     [attachment_url | _] = attachment["url"]
 414     media_type = attachment_url["mediaType"] || attachment_url["mimeType"] || "image"
 415     href = attachment_url["href"] |> MediaProxy.url()
 416     href_preview = attachment_url["href"] |> MediaProxy.preview_url()
 417
 418     type =
 419       cond do
 420         String.contains?(media_type, "image") -> "image"
 421         String.contains?(media_type, "video") -> "video"
 422         String.contains?(media_type, "audio") -> "audio"
 423         true -> "unknown"
 424       end
 425
 426     <<hash_id::signed-32, _rest::binary>> = :crypto.hash(:md5, href)
 427
 428     %{
 429       id: to_string(attachment["id"] || hash_id),
 430       url: href,
 431       remote_url: href,
 432       preview_url: href_preview,
 433       text_url: href,
 434       type: type,
 435       description: attachment["name"],
 436       pleroma: %{mime_type: media_type}
 437     }
 438   end
 439
 440   def render("context.json", %{activity: activity, activities: activities, user: user}) do
 441     %{ancestors: ancestors, descendants: descendants} =
 442       activities
 443       |> Enum.reverse()
 444       |> Enum.group_by(fn %{id: id} -> if id < activity.id, do: :ancestors, else: :descendants end)
 445       |> Map.put_new(:ancestors, [])
 446       |> Map.put_new(:descendants, [])
 447
 448     %{
 449       ancestors: render("index.json", for: user, activities: ancestors, as: :activity),
 450       descendants: render("index.json", for: user, activities: descendants, as: :activity)
 451     }
 452   end
 453
 454   def get_reply_to(activity, %{replied_to_activities: replied_to_activities}) do
 455     object = Object.normalize(activity)
 456
 457     with nil <- replied_to_activities[object.data["inReplyTo"]] do
 458       # If user didn't participate in the thread
 459       Activity.get_in_reply_to_activity(activity)
 460     end
 461   end
 462
 463   def get_reply_to(%{data: %{"object" => _object}} = activity, _) do
 464     object = Object.normalize(activity)
 465
 466     if object.data["inReplyTo"] && object.data["inReplyTo"] != "" do
 467       Activity.get_create_by_object_ap_id(object.data["inReplyTo"])
 468     else
 469       nil
 470     end
 471   end
 472
 473   def render_content(%{data: %{"type" => object_type}} = object)
 474       when object_type in ["Video", "Event", "Audio"] do
 475     with name when not is_nil(name) and name != "" <- object.data["name"] do
 476       "<p><a href=\"#{object.data["id"]}\">#{name}</a></p>#{object.data["content"]}"
 477     else
 478       _ -> object.data["content"] || ""
 479     end
 480   end
 481
 482   def render_content(%{data: %{"type" => object_type}} = object)
 483       when object_type in ["Article", "Page"] do
 484     with summary when not is_nil(summary) and summary != "" <- object.data["name"],
 485          url when is_bitstring(url) <- object.data["url"] do
 486       "<p><a href=\"#{url}\">#{summary}</a></p>#{object.data["content"]}"
 487     else
 488       _ -> object.data["content"] || ""
 489     end
 490   end
 491
 492   def render_content(object), do: object.data["content"] || ""
 493
 494   @doc """
 495   Builds a dictionary tags.
 496
 497   ## Examples
 498
 499   iex> Pleroma.Web.MastodonAPI.StatusView.build_tags(["fediverse", "nextcloud"])
 500   [{"name": "fediverse", "url": "/tag/fediverse"},
 501    {"name": "nextcloud", "url": "/tag/nextcloud"}]
 502
 503   """
 504   @spec build_tags(list(any())) :: list(map())
 505   def build_tags(object_tags) when is_list(object_tags) do
 506     object_tags
 507     |> Enum.filter(&is_binary/1)
 508     |> Enum.map(&%{name: &1, url: "/tag/#{URI.encode(&1)}"})
 509   end
 510
 511   def build_tags(_), do: []
 512
 513   @doc """
 514   Builds list emojis.
 515
 516   Arguments: `nil` or list tuple of name and url.
 517
 518   Returns list emojis.
 519
 520   ## Examples
 521
 522   iex> Pleroma.Web.MastodonAPI.StatusView.build_emojis([{"2hu", "corndog.png"}])
 523   [%{shortcode: "2hu", static_url: "corndog.png", url: "corndog.png", visible_in_picker: false}]
 524
 525   """
 526   @spec build_emojis(nil | list(tuple())) :: list(map())
 527   def build_emojis(nil), do: []
 528
 529   def build_emojis(emojis) do
 530     emojis
 531     |> Enum.map(fn {name, url} ->
 532       name = HTML.strip_tags(name)
 533
 534       url =
 535         url
 536         |> HTML.strip_tags()
 537         |> MediaProxy.url()
 538
 539       %{shortcode: name, url: url, static_url: url, visible_in_picker: false}
 540     end)
 541   end
 542
 543   defp present?(nil), do: false
 544   defp present?(false), do: false
 545   defp present?(_), do: true
 546
 547   defp pinned?(%Activity{id: id}, %User{pinned_activities: pinned_activities}),
 548     do: id in pinned_activities
 549 end