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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
 417     type =
 418       cond do
 419         String.contains?(media_type, "image") -> "image"
 420         String.contains?(media_type, "video") -> "video"
 421         String.contains?(media_type, "audio") -> "audio"
 422         true -> "unknown"
 423       end
 424
 425     <<hash_id::signed-32, _rest::binary>> = :crypto.hash(:md5, href)
 426
 427     %{
 428       id: to_string(attachment["id"] || hash_id),
 429       url: href,
 430       remote_url: href,
 431       preview_url: href,
 432       text_url: href,
 433       type: type,
 434       description: attachment["name"],
 435       pleroma: %{mime_type: media_type}
 436     }
 437   end
 438
 439   def render("context.json", %{activity: activity, activities: activities, user: user}) do
 440     %{ancestors: ancestors, descendants: descendants} =
 441       activities
 442       |> Enum.reverse()
 443       |> Enum.group_by(fn %{id: id} -> if id < activity.id, do: :ancestors, else: :descendants end)
 444       |> Map.put_new(:ancestors, [])
 445       |> Map.put_new(:descendants, [])
 446
 447     %{
 448       ancestors: render("index.json", for: user, activities: ancestors, as: :activity),
 449       descendants: render("index.json", for: user, activities: descendants, as: :activity)
 450     }
 451   end
 452
 453   def get_reply_to(activity, %{replied_to_activities: replied_to_activities}) do
 454     object = Object.normalize(activity)
 455
 456     with nil <- replied_to_activities[object.data["inReplyTo"]] do
 457       # If user didn't participate in the thread
 458       Activity.get_in_reply_to_activity(activity)
 459     end
 460   end
 461
 462   def get_reply_to(%{data: %{"object" => _object}} = activity, _) do
 463     object = Object.normalize(activity)
 464
 465     if object.data["inReplyTo"] && object.data["inReplyTo"] != "" do
 466       Activity.get_create_by_object_ap_id(object.data["inReplyTo"])
 467     else
 468       nil
 469     end
 470   end
 471
 472   def render_content(%{data: %{"type" => object_type}} = object)
 473       when object_type in ["Video", "Event", "Audio"] do
 474     with name when not is_nil(name) and name != "" <- object.data["name"] do
 475       "<p><a href=\"#{object.data["id"]}\">#{name}</a></p>#{object.data["content"]}"
 476     else
 477       _ -> object.data["content"] || ""
 478     end
 479   end
 480
 481   def render_content(%{data: %{"type" => object_type}} = object)
 482       when object_type in ["Article", "Page"] do
 483     with summary when not is_nil(summary) and summary != "" <- object.data["name"],
 484          url when is_bitstring(url) <- object.data["url"] do
 485       "<p><a href=\"#{url}\">#{summary}</a></p>#{object.data["content"]}"
 486     else
 487       _ -> object.data["content"] || ""
 488     end
 489   end
 490
 491   def render_content(object), do: object.data["content"] || ""
 492
 493   @doc """
 494   Builds a dictionary tags.
 495
 496   ## Examples
 497
 498   iex> Pleroma.Web.MastodonAPI.StatusView.build_tags(["fediverse", "nextcloud"])
 499   [{"name": "fediverse", "url": "/tag/fediverse"},
 500    {"name": "nextcloud", "url": "/tag/nextcloud"}]
 501
 502   """
 503   @spec build_tags(list(any())) :: list(map())
 504   def build_tags(object_tags) when is_list(object_tags) do
 505     object_tags
 506     |> Enum.filter(&is_binary/1)
 507     |> Enum.map(&%{name: &1, url: "/tag/#{URI.encode(&1)}"})
 508   end
 509
 510   def build_tags(_), do: []
 511
 512   @doc """
 513   Builds list emojis.
 514
 515   Arguments: `nil` or list tuple of name and url.
 516
 517   Returns list emojis.
 518
 519   ## Examples
 520
 521   iex> Pleroma.Web.MastodonAPI.StatusView.build_emojis([{"2hu", "corndog.png"}])
 522   [%{shortcode: "2hu", static_url: "corndog.png", url: "corndog.png", visible_in_picker: false}]
 523
 524   """
 525   @spec build_emojis(nil | list(tuple())) :: list(map())
 526   def build_emojis(nil), do: []
 527
 528   def build_emojis(emojis) do
 529     emojis
 530     |> Enum.map(fn {name, url} ->
 531       name = HTML.strip_tags(name)
 532
 533       url =
 534         url
 535         |> HTML.strip_tags()
 536         |> MediaProxy.url()
 537
 538       %{shortcode: name, url: url, static_url: url, visible_in_picker: false}
 539     end)
 540   end
 541
 542   defp present?(nil), do: false
 543   defp present?(false), do: false
 544   defp present?(_), do: true
 545
 546   defp pinned?(%Activity{id: id}, %User{pinned_activities: pinned_activities}),
 547     do: id in pinned_activities
 548 end