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# Pleroma: A lightweight social networking server
# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Web.OStatus.NoteHandler do
require Logger
alias Pleroma.Activity
alias Pleroma.Object
alias Pleroma.Web.ActivityPub.ActivityPub
alias Pleroma.Web.ActivityPub.Utils
alias Pleroma.Web.CommonAPI
alias Pleroma.Web.OStatus
alias Pleroma.Web.XML
@doc """
Get the context for this note. Uses this:
1. The context of the parent activity
2. The conversation reference in the ostatus xml
3. A newly generated context id.
"""
def get_context(entry, in_reply_to) do
context =
(XML.string_from_xpath("//ostatus:conversation[1]", entry) ||
XML.string_from_xpath("//ostatus:conversation[1]/@ref", entry) || "")
|> String.trim()
with %{data: %{"context" => context}} <- Object.get_cached_by_ap_id(in_reply_to) do
context
else
_e ->
if String.length(context) > 0 do
context
else
Utils.generate_context_id()
end
end
end
def get_people_mentions(entry) do
:xmerl_xpath.string(
'//link[@rel="mentioned" and @ostatus:object-type="http://activitystrea.ms/schema/1.0/person"]',
entry
)
|> Enum.map(fn person -> XML.string_from_xpath("@href", person) end)
end
def get_collection_mentions(entry) do
transmogrify = fn
"http://activityschema.org/collection/public" ->
"https://www.w3.org/ns/activitystreams#Public"
group ->
group
end
:xmerl_xpath.string(
'//link[@rel="mentioned" and @ostatus:object-type="http://activitystrea.ms/schema/1.0/collection"]',
entry
)
|> Enum.map(fn collection -> XML.string_from_xpath("@href", collection) |> transmogrify.() end)
end
def get_mentions(entry) do
(get_people_mentions(entry) ++ get_collection_mentions(entry))
|> Enum.filter(& &1)
end
def get_emoji(entry) do
try do
:xmerl_xpath.string('//link[@rel="emoji"]', entry)
|> Enum.reduce(%{}, fn emoji, acc ->
Map.put(acc, XML.string_from_xpath("@name", emoji), XML.string_from_xpath("@href", emoji))
end)
rescue
_e -> nil
end
end
def make_to_list(actor, mentions) do
[
actor.follower_address
] ++ mentions
end
def add_external_url(note, entry) do
url = XML.string_from_xpath("//link[@rel='alternate' and @type='text/html']/@href", entry)
Map.put(note, "external_url", url)
end
def fetch_replied_to_activity(entry, in_reply_to) do
with %Activity{} = activity <- Activity.get_create_by_object_ap_id(in_reply_to) do
activity
else
_e ->
with in_reply_to_href when not is_nil(in_reply_to_href) <-
XML.string_from_xpath("//thr:in-reply-to[1]/@href", entry),
{:ok, [activity | _]} <- OStatus.fetch_activity_from_url(in_reply_to_href) do
activity
else
_e -> nil
end
end
end
# TODO: Clean this up a bit.
def handle_note(entry, doc \\ nil) do
with id <- XML.string_from_xpath("//id", entry),
activity when is_nil(activity) <- Activity.get_create_by_object_ap_id(id),
[author] <- :xmerl_xpath.string('//author[1]', doc),
{:ok, actor} <- OStatus.find_make_or_update_user(author),
content_html <- OStatus.get_content(entry),
cw <- OStatus.get_cw(entry),
in_reply_to <- XML.string_from_xpath("//thr:in-reply-to[1]/@ref", entry),
in_reply_to_activity <- fetch_replied_to_activity(entry, in_reply_to),
in_reply_to <-
(in_reply_to_activity && in_reply_to_activity.data["object"]["id"]) || in_reply_to,
attachments <- OStatus.get_attachments(entry),
context <- get_context(entry, in_reply_to),
tags <- OStatus.get_tags(entry),
mentions <- get_mentions(entry),
to <- make_to_list(actor, mentions),
date <- XML.string_from_xpath("//published", entry),
unlisted <- XML.string_from_xpath("//mastodon:scope", entry) == "unlisted",
cc <- if(unlisted, do: ["https://www.w3.org/ns/activitystreams#Public"], else: []),
note <-
CommonAPI.Utils.make_note_data(
actor.ap_id,
to,
context,
content_html,
attachments,
in_reply_to_activity,
[],
cw
),
note <- note |> Map.put("id", id) |> Map.put("tag", tags),
note <- note |> Map.put("published", date),
note <- note |> Map.put("emoji", get_emoji(entry)),
note <- add_external_url(note, entry),
note <- note |> Map.put("cc", cc),
# TODO: Handle this case in make_note_data
note <-
if(
in_reply_to && !in_reply_to_activity,
do: note |> Map.put("inReplyTo", in_reply_to),
else: note
) do
ActivityPub.create(%{
to: to,
actor: actor,
context: context,
object: note,
published: date,
local: false,
additional: %{"cc" => cc}
})
else
%Activity{} = activity -> {:ok, activity}
e -> {:error, e}
end
end
end
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