git.squeep.com Git - akkoma/blob - lib/pleroma/web/ostatus/handlers/note_handler.ex

   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.NoteHandler do
   6   require Logger
   7   alias Pleroma.Web.{XML, OStatus}
   8   alias Pleroma.{Object, Activity}
   9   alias Pleroma.Web.ActivityPub.{ActivityPub, Utils}
  10   alias Pleroma.Web.CommonAPI
  11
  12   @doc """
  13   Get the context for this note. Uses this:
  14   1. The context of the parent activity
  15   2. The conversation reference in the ostatus xml
  16   3. A newly generated context id.
  17   """
  18   def get_context(entry, inReplyTo) do
  19     context =
  20       (XML.string_from_xpath("//ostatus:conversation[1]", entry) ||
  21          XML.string_from_xpath("//ostatus:conversation[1]/@ref", entry) || "")
  22       |> String.trim()
  23
  24     with %{data: %{"context" => context}} <- Object.get_cached_by_ap_id(inReplyTo) do
  25       context
  26     else
  27       _e ->
  28         if String.length(context) > 0 do
  29           context
  30         else
  31           Utils.generate_context_id()
  32         end
  33     end
  34   end
  35
  36   def get_people_mentions(entry) do
  37     :xmerl_xpath.string(
  38       '//link[@rel="mentioned" and @ostatus:object-type="http://activitystrea.ms/schema/1.0/person"]',
  39       entry
  40     )
  41     |> Enum.map(fn person -> XML.string_from_xpath("@href", person) end)
  42   end
  43
  44   def get_collection_mentions(entry) do
  45     transmogrify = fn
  46       "http://activityschema.org/collection/public" ->
  47         "https://www.w3.org/ns/activitystreams#Public"
  48
  49       group ->
  50         group
  51     end
  52
  53     :xmerl_xpath.string(
  54       '//link[@rel="mentioned" and @ostatus:object-type="http://activitystrea.ms/schema/1.0/collection"]',
  55       entry
  56     )
  57     |> Enum.map(fn collection -> XML.string_from_xpath("@href", collection) |> transmogrify.() end)
  58   end
  59
  60   def get_mentions(entry) do
  61     (get_people_mentions(entry) ++ get_collection_mentions(entry))
  62     |> Enum.filter(& &1)
  63   end
  64
  65   def get_emoji(entry) do
  66     try do
  67       :xmerl_xpath.string('//link[@rel="emoji"]', entry)
  68       |> Enum.reduce(%{}, fn emoji, acc ->
  69         Map.put(acc, XML.string_from_xpath("@name", emoji), XML.string_from_xpath("@href", emoji))
  70       end)
  71     rescue
  72       _e -> nil
  73     end
  74   end
  75
  76   def make_to_list(actor, mentions) do
  77     [
  78       actor.follower_address
  79     ] ++ mentions
  80   end
  81
  82   def add_external_url(note, entry) do
  83     url = XML.string_from_xpath("//link[@rel='alternate' and @type='text/html']/@href", entry)
  84     Map.put(note, "external_url", url)
  85   end
  86
  87   def fetch_replied_to_activity(entry, inReplyTo) do
  88     with %Activity{} = activity <- Activity.get_create_by_object_ap_id(inReplyTo) do
  89       activity
  90     else
  91       _e ->
  92         with inReplyToHref when not is_nil(inReplyToHref) <-
  93                XML.string_from_xpath("//thr:in-reply-to[1]/@href", entry),
  94              {:ok, [activity | _]} <- OStatus.fetch_activity_from_url(inReplyToHref) do
  95           activity
  96         else
  97           _e -> nil
  98         end
  99     end
 100   end
 101
 102   # TODO: Clean this up a bit.
 103   def handle_note(entry, doc \\ nil) do
 104     with id <- XML.string_from_xpath("//id", entry),
 105          activity when is_nil(activity) <- Activity.get_create_by_object_ap_id(id),
 106          [author] <- :xmerl_xpath.string('//author[1]', doc),
 107          {:ok, actor} <- OStatus.find_make_or_update_user(author),
 108          content_html <- OStatus.get_content(entry),
 109          cw <- OStatus.get_cw(entry),
 110          inReplyTo <- XML.string_from_xpath("//thr:in-reply-to[1]/@ref", entry),
 111          inReplyToActivity <- fetch_replied_to_activity(entry, inReplyTo),
 112          inReplyTo <- (inReplyToActivity && inReplyToActivity.data["object"]["id"]) || inReplyTo,
 113          attachments <- OStatus.get_attachments(entry),
 114          context <- get_context(entry, inReplyTo),
 115          tags <- OStatus.get_tags(entry),
 116          mentions <- get_mentions(entry),
 117          to <- make_to_list(actor, mentions),
 118          date <- XML.string_from_xpath("//published", entry),
 119          unlisted <- XML.string_from_xpath("//mastodon:scope", entry) == "unlisted",
 120          cc <- if(unlisted, do: ["https://www.w3.org/ns/activitystreams#Public"], else: []),
 121          note <-
 122            CommonAPI.Utils.make_note_data(
 123              actor.ap_id,
 124              to,
 125              context,
 126              content_html,
 127              attachments,
 128              inReplyToActivity,
 129              [],
 130              cw
 131            ),
 132          note <- note |> Map.put("id", id) |> Map.put("tag", tags),
 133          note <- note |> Map.put("published", date),
 134          note <- note |> Map.put("emoji", get_emoji(entry)),
 135          note <- add_external_url(note, entry),
 136          note <- note |> Map.put("cc", cc),
 137          # TODO: Handle this case in make_note_data
 138          note <-
 139            if(
 140              inReplyTo && !inReplyToActivity,
 141              do: note |> Map.put("inReplyTo", inReplyTo),
 142              else: note
 143            ) do
 144       ActivityPub.create(%{
 145         to: to,
 146         actor: actor,
 147         context: context,
 148         object: note,
 149         published: date,
 150         local: false,
 151         additional: %{"cc" => cc}
 152       })
 153     else
 154       %Activity{} = activity -> {:ok, activity}
 155       e -> {:error, e}
 156     end
 157   end
 158 end