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

114 lines
3.1 KiB
Elixir

defmodule Mobilizon.Federation.ActivityStream.Converter.Flag do
@moduledoc """
Flag converter.
This module allows to convert reports from ActivityStream format to our own
internal one, and back.
Note: Reports are named Flag in AS.
"""
alias Mobilizon.Actors.Actor
alias Mobilizon.Discussions.Comment
alias Mobilizon.Events.Event
alias Mobilizon.Reports.Report
alias Mobilizon.Federation.ActivityPub
alias Mobilizon.Federation.ActivityPub.Actor, as: ActivityPubActor
alias Mobilizon.Federation.ActivityPub.Relay
alias Mobilizon.Federation.ActivityStream.{Converter, Convertible}
@behaviour Converter
defimpl Convertible, for: Report do
alias Mobilizon.Federation.ActivityStream.Converter.Flag, as: FlagConverter
defdelegate model_to_as(report), to: FlagConverter
end
@doc """
Converts an AP object data to our internal data structure.
"""
@impl Converter
@spec as_to_model_data(map) :: map
def as_to_model_data(object) do
with params <- as_to_model(object) do
%{
"reporter_id" => params["reporter"].id,
"uri" => params["uri"],
"content" => params["content"],
"reported_id" => params["reported"].id,
"events" => params["events"],
"comments" => params["comments"]
}
end
end
@doc """
Convert an event struct to an ActivityStream representation
"""
@impl Converter
@spec model_to_as(Report.t()) :: map
def model_to_as(%Report{} = report) do
object =
[report.reported.url] ++
Enum.map(report.comments, fn comment -> comment.url end) ++
Enum.map(report.events, & &1.url)
%{
"type" => "Flag",
"actor" => Relay.get_actor().url,
"id" => report.url,
"content" => report.content,
"object" => object
}
end
@spec as_to_model(map) :: map
def as_to_model(%{"object" => objects} = object) do
with {:ok, %Actor{} = reporter} <-
ActivityPubActor.get_or_fetch_actor_by_url(object["actor"]),
%Actor{} = reported <- find_reported(objects),
%{events: events, comments: comments} <- find_events_and_comments(objects) do
%{
"reporter" => reporter,
"uri" => object["id"],
"content" => object["content"],
"reported" => reported,
"events" => events,
"comments" => comments
}
end
end
@spec find_reported(list(String.t())) :: Actor.t() | nil
defp find_reported(objects) do
Enum.reduce_while(objects, nil, fn url, _ ->
case ActivityPubActor.get_or_fetch_actor_by_url(url) do
{:ok, %Actor{} = actor} ->
{:halt, actor}
_ ->
{:cont, nil}
end
end)
end
defp find_events_and_comments(objects) do
objects
|> Enum.map(&ActivityPub.fetch_object_from_url/1)
|> Enum.reduce(%{comments: [], events: []}, fn res, acc ->
case res do
{:ok, %Event{} = event} ->
Map.put(acc, :events, [event | acc.events])
{:ok, %Comment{} = comment} ->
Map.put(acc, :comments, [comment | acc.comments])
_ ->
acc
end
end)
end
end