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