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