mobilizon/lib/federation/activity_stream/converter/comment.ex

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defmodule Mobilizon.Federation.ActivityStream.Converter.Comment do
@moduledoc """
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Comment converter.
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This module allows to convert events from ActivityStream format to our own
internal one, and back.
"""
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alias Mobilizon.Actors.Actor
alias Mobilizon.Discussions
alias Mobilizon.Discussions.Comment, as: CommentModel
alias Mobilizon.Discussions.Discussion
alias Mobilizon.Events.Event
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alias Mobilizon.Federation.ActivityPub
alias Mobilizon.Federation.ActivityPub.Visibility
alias Mobilizon.Federation.ActivityStream.{Converter, Convertible}
alias Mobilizon.Federation.ActivityStream.Converter.Comment, as: CommentConverter
alias Mobilizon.Tombstone, as: TombstoneModel
import Mobilizon.Federation.ActivityStream.Converter.Utils,
only: [
fetch_tags: 1,
fetch_mentions: 1,
build_tags: 1,
build_mentions: 1,
maybe_fetch_actor_and_attributed_to_id: 1
]
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require Logger
@behaviour Converter
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defimpl Convertible, for: CommentModel do
defdelegate model_to_as(comment), to: CommentConverter
end
@doc """
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Converts an AP object data to our internal data structure.
"""
@impl Converter
@spec as_to_model_data(map) :: map | {:error, atom}
def as_to_model_data(object) do
Logger.debug("We're converting raw ActivityStream data to a comment entity")
Logger.debug(inspect(object))
tag_object = Map.get(object, "tag", [])
case maybe_fetch_actor_and_attributed_to_id(object) do
{:ok, %Actor{id: actor_id, domain: actor_domain}, attributed_to} ->
data = %{
text: object["content"],
url: object["id"],
# Will be used in conversations, ignored in basic comments
title: object["name"],
context: object["context"],
actor_id: actor_id,
attributed_to_id: if(is_nil(attributed_to), do: nil, else: attributed_to.id),
in_reply_to_comment_id: nil,
event_id: nil,
uuid: object["uuid"],
discussion_id: get_discussion_id(object),
tags: fetch_tags(tag_object),
mentions: fetch_mentions(tag_object),
local: is_nil(actor_domain),
visibility: if(Visibility.is_public?(object), do: :public, else: :private),
published_at: object["published"],
is_announcement: Map.get(object, "isAnnouncement", false)
}
maybe_fetch_parent_object(object, data)
{:error, err} ->
{:error, err}
end
end
@doc """
Make an AS comment object from an existing `Comment` structure.
A "soft-deleted" comment is a tombstone
"""
@impl Converter
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@spec model_to_as(CommentModel.t()) :: map
def model_to_as(
%CommentModel{
deleted_at: nil,
attributed_to: attributed_to,
actor: %Actor{url: comment_actor_url}
} = comment
) do
to = determine_to(comment)
attributed_to =
if is_nil(attributed_to),
do: comment_actor_url,
else: Map.get(attributed_to, :url, comment_actor_url)
object = %{
"type" => "Note",
"to" => to,
"cc" => [],
"content" => comment.text,
"mediaType" => "text/html",
"actor" => comment.actor.url,
"attributedTo" => attributed_to,
"uuid" => comment.uuid,
"id" => comment.url,
"tag" => build_mentions(comment.mentions) ++ build_tags(comment.tags),
"published" => comment.published_at |> DateTime.to_iso8601(),
"isAnnouncement" => comment.is_announcement
}
object =
if comment.discussion_id,
do: Map.put(object, "context", comment.discussion.url),
else: object
cond do
comment.in_reply_to_comment ->
Map.put(object, "inReplyTo", comment.in_reply_to_comment.url)
comment.event ->
Map.put(object, "inReplyTo", comment.event.url)
true ->
object
end
end
@impl Converter
def model_to_as(%CommentModel{} = comment) do
Convertible.model_to_as(%TombstoneModel{
uri: comment.url,
actor: comment.actor,
inserted_at: comment.deleted_at
})
end
@spec determine_to(CommentModel.t()) :: [String.t()]
defp determine_to(%CommentModel{visibility: :private, mentions: mentions} = _comment) do
Enum.map(mentions, fn mention -> mention.actor.url end)
end
defp determine_to(%CommentModel{visibility: :public} = comment) do
if is_nil(comment.attributed_to) do
["https://www.w3.org/ns/activitystreams#Public"]
else
[comment.attributed_to.url]
end
end
defp determine_to(%CommentModel{} = comment) do
[comment.actor.followers_url]
end
defp maybe_fetch_parent_object(object, data) do
# We fetch the parent object
Logger.debug("We're fetching the parent object")
if Map.has_key?(object, "inReplyTo") && object["inReplyTo"] != nil &&
object["inReplyTo"] != "" do
Logger.debug(fn -> "Object has inReplyTo #{object["inReplyTo"]}" end)
case ActivityPub.fetch_object_from_url(object["inReplyTo"]) do
# Reply to an event (Event)
{:ok, %Event{id: id} = event} ->
Logger.debug("Parent object is an event")
data
|> Map.put(:event_id, id)
|> Map.put(:event, event)
# Reply to a comment (Comment)
{:ok, %CommentModel{id: id} = comment} ->
Logger.debug("Parent object is another comment")
data
|> Map.put(:in_reply_to_comment_id, id)
|> Map.put(:origin_comment_id, comment |> CommentModel.get_thread_id())
|> Map.put(:event_id, comment.event_id)
|> Map.put(:conversation_id, comment.conversation_id)
# Reply to a discucssion (Discussion)
{:ok,
%Discussion{
id: discussion_id,
last_comment: %CommentModel{id: last_comment_id, origin_comment_id: origin_comment_id}
} = _discussion} ->
Logger.debug("Parent object is a discussion")
data
|> Map.put(:in_reply_to_comment_id, last_comment_id)
|> Map.put(:origin_comment_id, origin_comment_id)
|> Map.put(:discussion_id, discussion_id)
# Reply to a deleted entity
{:ok, %Mobilizon.Tombstone{}} ->
data
# Anything else is kind of a MP
{:error, parent} ->
Logger.warning("Parent object is something we don't handle")
Logger.debug(inspect(parent))
data
end
else
Logger.debug("No parent object for this comment")
data
end
end
defp get_discussion_id(%{"context" => context}) do
case Discussions.get_discussion_by_url(context) do
%Discussion{id: discussion_id} -> discussion_id
nil -> nil
end
end
defp get_discussion_id(_object), do: nil
end