mobilizon/lib/service/activity_pub/converter/comment.ex

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defmodule Mobilizon.Service.ActivityPub.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.Events.Comment, as: CommentModel
alias Mobilizon.Events.Event
alias Mobilizon.Service.ActivityPub
alias Mobilizon.Service.ActivityPub.{Converter, Convertible, Visibility}
alias Mobilizon.Service.ActivityPub.Converter.Utils, as: ConverterUtils
alias Mobilizon.Tombstone, as: TombstoneModel
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require Logger
@behaviour Converter
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defimpl Convertible, for: CommentModel do
alias Mobilizon.Service.ActivityPub.Converter.Comment, as: CommentConverter
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) :: {:ok, map} | {:error, any()}
def as_to_model_data(object) do
Logger.debug("We're converting raw ActivityStream data to a comment entity")
Logger.debug(inspect(object))
with author_url <- Map.get(object, "actor") || Map.get(object, "attributedTo"),
{:ok, %Actor{id: actor_id, domain: domain}} <-
ActivityPub.get_or_fetch_actor_by_url(author_url),
{:tags, tags} <- {:tags, ConverterUtils.fetch_tags(Map.get(object, "tag", []))},
{:mentions, mentions} <-
{:mentions, ConverterUtils.fetch_mentions(Map.get(object, "tag", []))} do
Logger.debug("Inserting full comment")
Logger.debug(inspect(object))
data = %{
text: object["content"],
url: object["id"],
actor_id: actor_id,
in_reply_to_comment_id: nil,
event_id: nil,
uuid: object["uuid"],
tags: tags,
mentions: mentions,
local: is_nil(domain),
visibility: if(Visibility.is_public?(object), do: :public, else: :private)
}
# We fetch the parent object
Logger.debug("We're fetching the parent object")
data =
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}} ->
Logger.debug("Parent object is an event")
data |> Map.put(:event_id, id)
# 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)
# Anything else is kind of a MP
{:error, parent} ->
Logger.warn("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
{:ok, data}
else
err ->
{:error, err}
end
end
@doc """
Make an AS comment object from an existing `Comment` structure.
"""
@impl Converter
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@spec model_to_as(CommentModel.t()) :: map
def model_to_as(%CommentModel{deleted_at: nil} = comment) do
to =
if comment.visibility == :public,
do: ["https://www.w3.org/ns/activitystreams#Public"],
else: [comment.actor.followers_url]
object = %{
"type" => "Note",
"to" => to,
"cc" => [],
"content" => comment.text,
"mediaType" => "text/html",
"actor" => comment.actor.url,
"attributedTo" => comment.actor.url,
"uuid" => comment.uuid,
"id" => comment.url,
"tag" =>
ConverterUtils.build_mentions(comment.mentions) ++ ConverterUtils.build_tags(comment.tags)
}
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
@spec model_to_as(CommentModel.t()) :: map
@doc """
A "soft-deleted" comment is a tombstone
"""
def model_to_as(%CommentModel{} = comment) do
Convertible.model_to_as(%TombstoneModel{
uri: comment.url,
inserted_at: comment.deleted_at
})
end
end