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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.OStatus.ActivityRepresenter do
   6   alias Pleroma.Activity
   7   alias Pleroma.Object
   8   alias Pleroma.User
   9   alias Pleroma.Web.OStatus.UserRepresenter
  10
  11   require Logger
  12
  13   defp get_href(id) do
  14     with %Object{data: %{"external_url" => external_url}} <- Object.get_cached_by_ap_id(id) do
  15       external_url
  16     else
  17       _e -> id
  18     end
  19   end
  20
  21   defp get_in_reply_to(%{"object" => %{"inReplyTo" => in_reply_to}}) do
  22     [
  23       {:"thr:in-reply-to",
  24        [ref: to_charlist(in_reply_to), href: to_charlist(get_href(in_reply_to))], []}
  25     ]
  26   end
  27
  28   defp get_in_reply_to(_), do: []
  29
  30   defp get_mentions(to) do
  31     Enum.map(to, fn id ->
  32       cond do
  33         # Special handling for the AP/Ostatus public collections
  34         "https://www.w3.org/ns/activitystreams#Public" == id ->
  35           {:link,
  36            [
  37              rel: "mentioned",
  38              "ostatus:object-type": "http://activitystrea.ms/schema/1.0/collection",
  39              href: "http://activityschema.org/collection/public"
  40            ], []}
  41
  42         # Ostatus doesn't handle follower collections, ignore these.
  43         Regex.match?(~r/^#{Pleroma.Web.base_url()}.+followers$/, id) ->
  44           []
  45
  46         true ->
  47           {:link,
  48            [
  49              rel: "mentioned",
  50              "ostatus:object-type": "http://activitystrea.ms/schema/1.0/person",
  51              href: id
  52            ], []}
  53       end
  54     end)
  55   end
  56
  57   defp get_links(%{local: true}, %{"id" => object_id}) do
  58     h = fn str -> [to_charlist(str)] end
  59
  60     [
  61       {:link, [type: ['application/atom+xml'], href: h.(object_id), rel: 'self'], []},
  62       {:link, [type: ['text/html'], href: h.(object_id), rel: 'alternate'], []}
  63     ]
  64   end
  65
  66   defp get_links(%{local: false}, %{"external_url" => external_url}) do
  67     h = fn str -> [to_charlist(str)] end
  68
  69     [
  70       {:link, [type: ['text/html'], href: h.(external_url), rel: 'alternate'], []}
  71     ]
  72   end
  73
  74   defp get_links(_activity, _object_data), do: []
  75
  76   defp get_emoji_links(emojis) do
  77     Enum.map(emojis, fn {emoji, file} ->
  78       {:link, [name: to_charlist(emoji), rel: 'emoji', href: to_charlist(file)], []}
  79     end)
  80   end
  81
  82   def to_simple_form(activity, user, with_author \\ false)
  83
  84   def to_simple_form(%{data: %{"type" => "Create"}} = activity, user, with_author) do
  85     h = fn str -> [to_charlist(str)] end
  86
  87     object = Object.normalize(activity.data["object"])
  88
  89     updated_at = object.data["published"]
  90     inserted_at = object.data["published"]
  91
  92     attachments =
  93       Enum.map(object.data["attachment"] || [], fn attachment ->
  94         url = hd(attachment["url"])
  95
  96         {:link,
  97          [rel: 'enclosure', href: to_charlist(url["href"]), type: to_charlist(url["mediaType"])],
  98          []}
  99       end)
 100
 101     in_reply_to = get_in_reply_to(activity.data)
 102     author = if with_author, do: [{:author, UserRepresenter.to_simple_form(user)}], else: []
 103     mentions = activity.recipients |> get_mentions
 104
 105     categories =
 106       (object.data["tag"] || [])
 107       |> Enum.map(fn tag ->
 108         if is_binary(tag) do
 109           {:category, [term: to_charlist(tag)], []}
 110         else
 111           nil
 112         end
 113       end)
 114       |> Enum.filter(& &1)
 115
 116     emoji_links = get_emoji_links(object.data["emoji"] || %{})
 117
 118     summary =
 119       if object.data["summary"] do
 120         [{:summary, [], h.(object.data["summary"])}]
 121       else
 122         []
 123       end
 124
 125     [
 126       {:"activity:object-type", ['http://activitystrea.ms/schema/1.0/note']},
 127       {:"activity:verb", ['http://activitystrea.ms/schema/1.0/post']},
 128       # For notes, federate the object id.
 129       {:id, h.(object.data["id"])},
 130       {:title, ['New note by #{user.nickname}']},
 131       {:content, [type: 'html'], h.(object.data["content"] |> String.replace(~r/[\n\r]/, ""))},
 132       {:published, h.(inserted_at)},
 133       {:updated, h.(updated_at)},
 134       {:"ostatus:conversation", [ref: h.(activity.data["context"])],
 135        h.(activity.data["context"])},
 136       {:link, [ref: h.(activity.data["context"]), rel: 'ostatus:conversation'], []}
 137     ] ++
 138       summary ++
 139       get_links(activity, object.data) ++
 140       categories ++ attachments ++ in_reply_to ++ author ++ mentions ++ emoji_links
 141   end
 142
 143   def to_simple_form(%{data: %{"type" => "Like"}} = activity, user, with_author) do
 144     h = fn str -> [to_charlist(str)] end
 145
 146     updated_at = activity.data["published"]
 147     inserted_at = activity.data["published"]
 148
 149     _in_reply_to = get_in_reply_to(activity.data)
 150     author = if with_author, do: [{:author, UserRepresenter.to_simple_form(user)}], else: []
 151     mentions = activity.recipients |> get_mentions
 152
 153     [
 154       {:"activity:verb", ['http://activitystrea.ms/schema/1.0/favorite']},
 155       {:id, h.(activity.data["id"])},
 156       {:title, ['New favorite by #{user.nickname}']},
 157       {:content, [type: 'html'], ['#{user.nickname} favorited something']},
 158       {:published, h.(inserted_at)},
 159       {:updated, h.(updated_at)},
 160       {:"activity:object",
 161        [
 162          {:"activity:object-type", ['http://activitystrea.ms/schema/1.0/note']},
 163          # For notes, federate the object id.
 164          {:id, h.(activity.data["object"])}
 165        ]},
 166       {:"ostatus:conversation", [ref: h.(activity.data["context"])],
 167        h.(activity.data["context"])},
 168       {:link, [ref: h.(activity.data["context"]), rel: 'ostatus:conversation'], []},
 169       {:link, [rel: 'self', type: ['application/atom+xml'], href: h.(activity.data["id"])], []},
 170       {:"thr:in-reply-to", [ref: to_charlist(activity.data["object"])], []}
 171     ] ++ author ++ mentions
 172   end
 173
 174   def to_simple_form(%{data: %{"type" => "Announce"}} = activity, user, with_author) do
 175     h = fn str -> [to_charlist(str)] end
 176
 177     updated_at = activity.data["published"]
 178     inserted_at = activity.data["published"]
 179
 180     _in_reply_to = get_in_reply_to(activity.data)
 181     author = if with_author, do: [{:author, UserRepresenter.to_simple_form(user)}], else: []
 182
 183     retweeted_activity = Activity.get_create_by_object_ap_id(activity.data["object"])
 184     retweeted_user = User.get_cached_by_ap_id(retweeted_activity.data["actor"])
 185
 186     retweeted_xml = to_simple_form(retweeted_activity, retweeted_user, true)
 187
 188     mentions =
 189       ([retweeted_user.ap_id] ++ activity.recipients)
 190       |> Enum.uniq()
 191       |> get_mentions()
 192
 193     [
 194       {:"activity:object-type", ['http://activitystrea.ms/schema/1.0/activity']},
 195       {:"activity:verb", ['http://activitystrea.ms/schema/1.0/share']},
 196       {:id, h.(activity.data["id"])},
 197       {:title, ['#{user.nickname} repeated a notice']},
 198       {:content, [type: 'html'], ['RT #{retweeted_activity.data["object"]["content"]}']},
 199       {:published, h.(inserted_at)},
 200       {:updated, h.(updated_at)},
 201       {:"ostatus:conversation", [ref: h.(activity.data["context"])],
 202        h.(activity.data["context"])},
 203       {:link, [ref: h.(activity.data["context"]), rel: 'ostatus:conversation'], []},
 204       {:link, [rel: 'self', type: ['application/atom+xml'], href: h.(activity.data["id"])], []},
 205       {:"activity:object", retweeted_xml}
 206     ] ++ mentions ++ author
 207   end
 208
 209   def to_simple_form(%{data: %{"type" => "Follow"}} = activity, user, with_author) do
 210     h = fn str -> [to_charlist(str)] end
 211
 212     updated_at = activity.data["published"]
 213     inserted_at = activity.data["published"]
 214
 215     author = if with_author, do: [{:author, UserRepresenter.to_simple_form(user)}], else: []
 216
 217     mentions = (activity.recipients || []) |> get_mentions
 218
 219     [
 220       {:"activity:object-type", ['http://activitystrea.ms/schema/1.0/activity']},
 221       {:"activity:verb", ['http://activitystrea.ms/schema/1.0/follow']},
 222       {:id, h.(activity.data["id"])},
 223       {:title, ['#{user.nickname} started following #{activity.data["object"]}']},
 224       {:content, [type: 'html'],
 225        ['#{user.nickname} started following #{activity.data["object"]}']},
 226       {:published, h.(inserted_at)},
 227       {:updated, h.(updated_at)},
 228       {:"activity:object",
 229        [
 230          {:"activity:object-type", ['http://activitystrea.ms/schema/1.0/person']},
 231          {:id, h.(activity.data["object"])},
 232          {:uri, h.(activity.data["object"])}
 233        ]},
 234       {:link, [rel: 'self', type: ['application/atom+xml'], href: h.(activity.data["id"])], []}
 235     ] ++ mentions ++ author
 236   end
 237
 238   # Only undos of follow for now. Will need to get redone once there are more
 239   def to_simple_form(
 240         %{data: %{"type" => "Undo", "object" => %{"type" => "Follow"} = follow_activity}} =
 241           activity,
 242         user,
 243         with_author
 244       ) do
 245     h = fn str -> [to_charlist(str)] end
 246
 247     updated_at = activity.data["published"]
 248     inserted_at = activity.data["published"]
 249
 250     author = if with_author, do: [{:author, UserRepresenter.to_simple_form(user)}], else: []
 251
 252     mentions = (activity.recipients || []) |> get_mentions
 253     follow_activity = Activity.normalize(follow_activity)
 254
 255     [
 256       {:"activity:object-type", ['http://activitystrea.ms/schema/1.0/activity']},
 257       {:"activity:verb", ['http://activitystrea.ms/schema/1.0/unfollow']},
 258       {:id, h.(activity.data["id"])},
 259       {:title, ['#{user.nickname} stopped following #{follow_activity.data["object"]}']},
 260       {:content, [type: 'html'],
 261        ['#{user.nickname} stopped following #{follow_activity.data["object"]}']},
 262       {:published, h.(inserted_at)},
 263       {:updated, h.(updated_at)},
 264       {:"activity:object",
 265        [
 266          {:"activity:object-type", ['http://activitystrea.ms/schema/1.0/person']},
 267          {:id, h.(follow_activity.data["object"])},
 268          {:uri, h.(follow_activity.data["object"])}
 269        ]},
 270       {:link, [rel: 'self', type: ['application/atom+xml'], href: h.(activity.data["id"])], []}
 271     ] ++ mentions ++ author
 272   end
 273
 274   def to_simple_form(%{data: %{"type" => "Delete"}} = activity, user, with_author) do
 275     h = fn str -> [to_charlist(str)] end
 276
 277     updated_at = activity.data["published"]
 278     inserted_at = activity.data["published"]
 279
 280     author = if with_author, do: [{:author, UserRepresenter.to_simple_form(user)}], else: []
 281
 282     [
 283       {:"activity:object-type", ['http://activitystrea.ms/schema/1.0/activity']},
 284       {:"activity:verb", ['http://activitystrea.ms/schema/1.0/delete']},
 285       {:id, h.(activity.data["object"])},
 286       {:title, ['An object was deleted']},
 287       {:content, [type: 'html'], ['An object was deleted']},
 288       {:published, h.(inserted_at)},
 289       {:updated, h.(updated_at)}
 290     ] ++ author
 291   end
 292
 293   def to_simple_form(_, _, _), do: nil
 294
 295   def wrap_with_entry(simple_form) do
 296     [
 297       {
 298         :entry,
 299         [
 300           xmlns: 'http://www.w3.org/2005/Atom',
 301           "xmlns:thr": 'http://purl.org/syndication/thread/1.0',
 302           "xmlns:activity": 'http://activitystrea.ms/spec/1.0/',
 303           "xmlns:poco": 'http://portablecontacts.net/spec/1.0',
 304           "xmlns:ostatus": 'http://ostatus.org/schema/1.0'
 305         ],
 306         simple_form
 307       }
 308     ]
 309   end
 310 end