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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.User
   8   alias Pleroma.Object
   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, data: data}) do
  58     h = fn str -> [to_charlist(str)] end
  59
  60     [
  61       {:link, [type: ['application/atom+xml'], href: h.(data["object"]["id"]), rel: 'self'], []},
  62       {:link, [type: ['text/html'], href: h.(data["object"]["id"]), rel: 'alternate'], []}
  63     ]
  64   end
  65
  66   defp get_links(%{
  67          local: false,
  68          data: %{
  69            "object" => %{
  70              "external_url" => external_url
  71            }
  72          }
  73        }) do
  74     h = fn str -> [to_charlist(str)] end
  75
  76     [
  77       {:link, [type: ['text/html'], href: h.(external_url), rel: 'alternate'], []}
  78     ]
  79   end
  80
  81   defp get_links(_activity), do: []
  82
  83   defp get_emoji_links(emojis) do
  84     Enum.map(emojis, fn {emoji, file} ->
  85       {:link, [name: to_charlist(emoji), rel: 'emoji', href: to_charlist(file)], []}
  86     end)
  87   end
  88
  89   def to_simple_form(activity, user, with_author \\ false)
  90
  91   def to_simple_form(%{data: %{"object" => %{"type" => "Note"}}} = activity, user, with_author) do
  92     h = fn str -> [to_charlist(str)] end
  93
  94     updated_at = activity.data["object"]["published"]
  95     inserted_at = activity.data["object"]["published"]
  96
  97     attachments =
  98       Enum.map(activity.data["object"]["attachment"] || [], fn attachment ->
  99         url = hd(attachment["url"])
 100
 101         {:link,
 102          [rel: 'enclosure', href: to_charlist(url["href"]), type: to_charlist(url["mediaType"])],
 103          []}
 104       end)
 105
 106     in_reply_to = get_in_reply_to(activity.data)
 107     author = if with_author, do: [{:author, UserRepresenter.to_simple_form(user)}], else: []
 108     mentions = activity.recipients |> get_mentions
 109
 110     categories =
 111       (activity.data["object"]["tag"] || [])
 112       |> Enum.map(fn tag ->
 113         if is_binary(tag) do
 114           {:category, [term: to_charlist(tag)], []}
 115         else
 116           nil
 117         end
 118       end)
 119       |> Enum.filter(& &1)
 120
 121     emoji_links = get_emoji_links(activity.data["object"]["emoji"] || %{})
 122
 123     summary =
 124       if activity.data["object"]["summary"] do
 125         [{:summary, [], h.(activity.data["object"]["summary"])}]
 126       else
 127         []
 128       end
 129
 130     [
 131       {:"activity:object-type", ['http://activitystrea.ms/schema/1.0/note']},
 132       {:"activity:verb", ['http://activitystrea.ms/schema/1.0/post']},
 133       # For notes, federate the object id.
 134       {:id, h.(activity.data["object"]["id"])},
 135       {:title, ['New note by #{user.nickname}']},
 136       {:content, [type: 'html'],
 137        h.(activity.data["object"]["content"] |> String.replace(~r/[\n\r]/, ""))},
 138       {:published, h.(inserted_at)},
 139       {:updated, h.(updated_at)},
 140       {:"ostatus:conversation", [ref: h.(activity.data["context"])],
 141        h.(activity.data["context"])},
 142       {:link, [ref: h.(activity.data["context"]), rel: 'ostatus:conversation'], []}
 143     ] ++
 144       summary ++
 145       get_links(activity) ++
 146       categories ++ attachments ++ in_reply_to ++ author ++ mentions ++ emoji_links
 147   end
 148
 149   def to_simple_form(%{data: %{"type" => "Like"}} = activity, user, with_author) do
 150     h = fn str -> [to_charlist(str)] end
 151
 152     updated_at = activity.data["published"]
 153     inserted_at = activity.data["published"]
 154
 155     _in_reply_to = get_in_reply_to(activity.data)
 156     author = if with_author, do: [{:author, UserRepresenter.to_simple_form(user)}], else: []
 157     mentions = activity.recipients |> get_mentions
 158
 159     [
 160       {:"activity:verb", ['http://activitystrea.ms/schema/1.0/favorite']},
 161       {:id, h.(activity.data["id"])},
 162       {:title, ['New favorite by #{user.nickname}']},
 163       {:content, [type: 'html'], ['#{user.nickname} favorited something']},
 164       {:published, h.(inserted_at)},
 165       {:updated, h.(updated_at)},
 166       {:"activity:object",
 167        [
 168          {:"activity:object-type", ['http://activitystrea.ms/schema/1.0/note']},
 169          # For notes, federate the object id.
 170          {:id, h.(activity.data["object"])}
 171        ]},
 172       {:"ostatus:conversation", [ref: h.(activity.data["context"])],
 173        h.(activity.data["context"])},
 174       {:link, [ref: h.(activity.data["context"]), rel: 'ostatus:conversation'], []},
 175       {:link, [rel: 'self', type: ['application/atom+xml'], href: h.(activity.data["id"])], []},
 176       {:"thr:in-reply-to", [ref: to_charlist(activity.data["object"])], []}
 177     ] ++ author ++ mentions
 178   end
 179
 180   def to_simple_form(%{data: %{"type" => "Announce"}} = activity, user, with_author) do
 181     h = fn str -> [to_charlist(str)] end
 182
 183     updated_at = activity.data["published"]
 184     inserted_at = activity.data["published"]
 185
 186     _in_reply_to = get_in_reply_to(activity.data)
 187     author = if with_author, do: [{:author, UserRepresenter.to_simple_form(user)}], else: []
 188
 189     retweeted_activity = Activity.get_create_by_object_ap_id(activity.data["object"])
 190     retweeted_user = User.get_cached_by_ap_id(retweeted_activity.data["actor"])
 191
 192     retweeted_xml = to_simple_form(retweeted_activity, retweeted_user, true)
 193
 194     mentions =
 195       ([retweeted_user.ap_id] ++ activity.recipients)
 196       |> Enum.uniq()
 197       |> get_mentions()
 198
 199     [
 200       {:"activity:object-type", ['http://activitystrea.ms/schema/1.0/activity']},
 201       {:"activity:verb", ['http://activitystrea.ms/schema/1.0/share']},
 202       {:id, h.(activity.data["id"])},
 203       {:title, ['#{user.nickname} repeated a notice']},
 204       {:content, [type: 'html'], ['RT #{retweeted_activity.data["object"]["content"]}']},
 205       {:published, h.(inserted_at)},
 206       {:updated, h.(updated_at)},
 207       {:"ostatus:conversation", [ref: h.(activity.data["context"])],
 208        h.(activity.data["context"])},
 209       {:link, [ref: h.(activity.data["context"]), rel: 'ostatus:conversation'], []},
 210       {:link, [rel: 'self', type: ['application/atom+xml'], href: h.(activity.data["id"])], []},
 211       {:"activity:object", retweeted_xml}
 212     ] ++ mentions ++ author
 213   end
 214
 215   def to_simple_form(%{data: %{"type" => "Follow"}} = activity, user, with_author) do
 216     h = fn str -> [to_charlist(str)] end
 217
 218     updated_at = activity.data["published"]
 219     inserted_at = activity.data["published"]
 220
 221     author = if with_author, do: [{:author, UserRepresenter.to_simple_form(user)}], else: []
 222
 223     mentions = (activity.recipients || []) |> get_mentions
 224
 225     [
 226       {:"activity:object-type", ['http://activitystrea.ms/schema/1.0/activity']},
 227       {:"activity:verb", ['http://activitystrea.ms/schema/1.0/follow']},
 228       {:id, h.(activity.data["id"])},
 229       {:title, ['#{user.nickname} started following #{activity.data["object"]}']},
 230       {:content, [type: 'html'],
 231        ['#{user.nickname} started following #{activity.data["object"]}']},
 232       {:published, h.(inserted_at)},
 233       {:updated, h.(updated_at)},
 234       {:"activity:object",
 235        [
 236          {:"activity:object-type", ['http://activitystrea.ms/schema/1.0/person']},
 237          {:id, h.(activity.data["object"])},
 238          {:uri, h.(activity.data["object"])}
 239        ]},
 240       {:link, [rel: 'self', type: ['application/atom+xml'], href: h.(activity.data["id"])], []}
 241     ] ++ mentions ++ author
 242   end
 243
 244   # Only undos of follow for now. Will need to get redone once there are more
 245   def to_simple_form(
 246         %{data: %{"type" => "Undo", "object" => %{"type" => "Follow"} = follow_activity}} =
 247           activity,
 248         user,
 249         with_author
 250       ) do
 251     h = fn str -> [to_charlist(str)] end
 252
 253     updated_at = activity.data["published"]
 254     inserted_at = activity.data["published"]
 255
 256     author = if with_author, do: [{:author, UserRepresenter.to_simple_form(user)}], else: []
 257
 258     mentions = (activity.recipients || []) |> get_mentions
 259     follow_activity = Activity.normalize(follow_activity)
 260
 261     [
 262       {:"activity:object-type", ['http://activitystrea.ms/schema/1.0/activity']},
 263       {:"activity:verb", ['http://activitystrea.ms/schema/1.0/unfollow']},
 264       {:id, h.(activity.data["id"])},
 265       {:title, ['#{user.nickname} stopped following #{follow_activity.data["object"]}']},
 266       {:content, [type: 'html'],
 267        ['#{user.nickname} stopped following #{follow_activity.data["object"]}']},
 268       {:published, h.(inserted_at)},
 269       {:updated, h.(updated_at)},
 270       {:"activity:object",
 271        [
 272          {:"activity:object-type", ['http://activitystrea.ms/schema/1.0/person']},
 273          {:id, h.(follow_activity.data["object"])},
 274          {:uri, h.(follow_activity.data["object"])}
 275        ]},
 276       {:link, [rel: 'self', type: ['application/atom+xml'], href: h.(activity.data["id"])], []}
 277     ] ++ mentions ++ author
 278   end
 279
 280   def to_simple_form(%{data: %{"type" => "Delete"}} = activity, user, with_author) do
 281     h = fn str -> [to_charlist(str)] end
 282
 283     updated_at = activity.data["published"]
 284     inserted_at = activity.data["published"]
 285
 286     author = if with_author, do: [{:author, UserRepresenter.to_simple_form(user)}], else: []
 287
 288     [
 289       {:"activity:object-type", ['http://activitystrea.ms/schema/1.0/activity']},
 290       {:"activity:verb", ['http://activitystrea.ms/schema/1.0/delete']},
 291       {:id, h.(activity.data["object"])},
 292       {:title, ['An object was deleted']},
 293       {:content, [type: 'html'], ['An object was deleted']},
 294       {:published, h.(inserted_at)},
 295       {:updated, h.(updated_at)}
 296     ] ++ author
 297   end
 298
 299   def to_simple_form(_, _, _), do: nil
 300
 301   def wrap_with_entry(simple_form) do
 302     [
 303       {
 304         :entry,
 305         [
 306           xmlns: 'http://www.w3.org/2005/Atom',
 307           "xmlns:thr": 'http://purl.org/syndication/thread/1.0',
 308           "xmlns:activity": 'http://activitystrea.ms/spec/1.0/',
 309           "xmlns:poco": 'http://portablecontacts.net/spec/1.0',
 310           "xmlns:ostatus": 'http://ostatus.org/schema/1.0'
 311         ],
 312         simple_form
 313       }
 314     ]
 315   end
 316 end