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   require Pleroma.Constants
   8
   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   alias Pleroma.Web.Federator
  15   alias Pleroma.Web.OStatus
  16   alias Pleroma.Web.XML
  17
  18   @doc """
  19   Get the context for this note. Uses this:
  20   1. The context of the parent activity
  21   2. The conversation reference in the ostatus xml
  22   3. A newly generated context id.
  23   """
  24   def get_context(entry, in_reply_to) do
  25     context =
  26       (XML.string_from_xpath("//ostatus:conversation[1]", entry) ||
  27          XML.string_from_xpath("//ostatus:conversation[1]/@ref", entry) || "")
  28       |> String.trim()
  29
  30     with %{data: %{"context" => context}} <- Object.get_cached_by_ap_id(in_reply_to) do
  31       context
  32     else
  33       _e ->
  34         if String.length(context) > 0 do
  35           context
  36         else
  37           Utils.generate_context_id()
  38         end
  39     end
  40   end
  41
  42   def get_people_mentions(entry) do
  43     :xmerl_xpath.string(
  44       '//link[@rel="mentioned" and @ostatus:object-type="http://activitystrea.ms/schema/1.0/person"]',
  45       entry
  46     )
  47     |> Enum.map(fn person -> XML.string_from_xpath("@href", person) end)
  48   end
  49
  50   def get_collection_mentions(entry) do
  51     transmogrify = fn
  52       "http://activityschema.org/collection/public" ->
  53         Pleroma.Constants.as_public()
  54
  55       group ->
  56         group
  57     end
  58
  59     :xmerl_xpath.string(
  60       '//link[@rel="mentioned" and @ostatus:object-type="http://activitystrea.ms/schema/1.0/collection"]',
  61       entry
  62     )
  63     |> Enum.map(fn collection -> XML.string_from_xpath("@href", collection) |> transmogrify.() end)
  64   end
  65
  66   def get_mentions(entry) do
  67     (get_people_mentions(entry) ++ get_collection_mentions(entry))
  68     |> Enum.filter(& &1)
  69   end
  70
  71   def get_emoji(entry) do
  72     try do
  73       :xmerl_xpath.string('//link[@rel="emoji"]', entry)
  74       |> Enum.reduce(%{}, fn emoji, acc ->
  75         Map.put(acc, XML.string_from_xpath("@name", emoji), XML.string_from_xpath("@href", emoji))
  76       end)
  77     rescue
  78       _e -> nil
  79     end
  80   end
  81
  82   def make_to_list(actor, mentions) do
  83     [
  84       actor.follower_address
  85     ] ++ mentions
  86   end
  87
  88   def add_external_url(note, entry) do
  89     url = XML.string_from_xpath("//link[@rel='alternate' and @type='text/html']/@href", entry)
  90     Map.put(note, "external_url", url)
  91   end
  92
  93   def fetch_replied_to_activity(entry, in_reply_to, options \\ []) do
  94     with %Activity{} = activity <- Activity.get_create_by_object_ap_id(in_reply_to) do
  95       activity
  96     else
  97       _e ->
  98         with true <- Federator.allowed_incoming_reply_depth?(options[:depth]),
  99              in_reply_to_href when not is_nil(in_reply_to_href) <-
 100                XML.string_from_xpath("//thr:in-reply-to[1]/@href", entry),
 101              {:ok, [activity | _]} <- OStatus.fetch_activity_from_url(in_reply_to_href, options) do
 102           activity
 103         else
 104           _e -> nil
 105         end
 106     end
 107   end
 108
 109   # TODO: Clean this up a bit.
 110   def handle_note(entry, doc \\ nil, options \\ []) do
 111     with id <- XML.string_from_xpath("//id", entry),
 112          activity when is_nil(activity) <- Activity.get_create_by_object_ap_id_with_object(id),
 113          [author] <- :xmerl_xpath.string('//author[1]', doc),
 114          {:ok, actor} <- OStatus.find_make_or_update_actor(author),
 115          content_html <- OStatus.get_content(entry),
 116          cw <- OStatus.get_cw(entry),
 117          in_reply_to <- XML.string_from_xpath("//thr:in-reply-to[1]/@ref", entry),
 118          options <- Keyword.put(options, :depth, (options[:depth] || 0) + 1),
 119          in_reply_to_activity <- fetch_replied_to_activity(entry, in_reply_to, options),
 120          in_reply_to_object <-
 121            (in_reply_to_activity && Object.normalize(in_reply_to_activity)) || nil,
 122          in_reply_to <- (in_reply_to_object && in_reply_to_object.data["id"]) || in_reply_to,
 123          attachments <- OStatus.get_attachments(entry),
 124          context <- get_context(entry, in_reply_to),
 125          tags <- OStatus.get_tags(entry),
 126          mentions <- get_mentions(entry),
 127          to <- make_to_list(actor, mentions),
 128          date <- XML.string_from_xpath("//published", entry),
 129          unlisted <- XML.string_from_xpath("//mastodon:scope", entry) == "unlisted",
 130          cc <- if(unlisted, do: [Pleroma.Constants.as_public()], else: []),
 131          note <-
 132            CommonAPI.Utils.make_note_data(
 133              actor.ap_id,
 134              to,
 135              context,
 136              content_html,
 137              attachments,
 138              in_reply_to_activity,
 139              [],
 140              cw
 141            ),
 142          note <- note |> Map.put("id", id) |> Map.put("tag", tags),
 143          note <- note |> Map.put("published", date),
 144          note <- note |> Map.put("emoji", get_emoji(entry)),
 145          note <- add_external_url(note, entry),
 146          note <- note |> Map.put("cc", cc),
 147          # TODO: Handle this case in make_note_data
 148          note <-
 149            if(
 150              in_reply_to && !in_reply_to_activity,
 151              do: note |> Map.put("inReplyTo", in_reply_to),
 152              else: note
 153            ) do
 154       ActivityPub.create(%{
 155         to: to,
 156         actor: actor,
 157         context: context,
 158         object: note,
 159         published: date,
 160         local: false,
 161         additional: %{"cc" => cc}
 162       })
 163     else
 164       %Activity{} = activity -> {:ok, activity}
 165       e -> {:error, e}
 166     end
 167   end
 168 end