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