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

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defmodule Mobilizon.Service.ActivityPub.Converter.Flag do
@moduledoc """
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Flag converter.
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This module allows to convert reports from ActivityStream format to our own
internal one, and back.
Note: Reports are named Flag in AS.
"""
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alias Mobilizon.Actors
alias Mobilizon.Actors.Actor
alias Mobilizon.Events
alias Mobilizon.Events.Event
alias Mobilizon.Reports.Report
alias Mobilizon.Service.ActivityPub.Converter
alias Mobilizon.Service.ActivityPub.Convertible
@behaviour Converter
defimpl Convertible, for: Report do
alias Mobilizon.Service.ActivityPub.Converter.Flag, as: FlagConverter
defdelegate model_to_as(report), to: FlagConverter
end
@doc """
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Converts an AP object data to our internal data structure.
"""
@impl Converter
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@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,
"event_id" => (!is_nil(params["event"]) && params["event"].id) || nil,
"comments" => params["comments"]
}
end
end
@audience %{"to" => ["https://www.w3.org/ns/activitystreams#Public"], "cc" => []}
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@doc """
Convert an event struct to an ActivityStream representation
"""
@impl Converter
@spec model_to_as(Report.t()) :: map
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def model_to_as(%Report{} = report) do
object = [report.reported.url] ++ Enum.map(report.comments, fn comment -> comment.url end)
object = if report.event, do: object ++ [report.event.url], else: object
audience =
if report.local, do: @audience, else: Map.put(@audience, "cc", [report.reported.url])
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%{
"type" => "Flag",
"actor" => report.reporter.url,
"id" => report.url,
"content" => report.content,
"object" => object
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}
|> Map.merge(audience)
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end
@spec as_to_model(map) :: map
def as_to_model(%{"object" => objects} = object) do
with {:ok, %Actor{} = reporter} <- Actors.get_actor_by_url(object["actor"]),
%Actor{} = reported <-
Enum.reduce_while(objects, nil, fn url, _ ->
case Actors.get_actor_by_url(url) do
{:ok, %Actor{} = actor} ->
{:halt, actor}
_ ->
{:cont, nil}
end
end),
event <-
Enum.reduce_while(objects, nil, fn url, _ ->
case Events.get_event_by_url(url) do
%Event{} = event ->
{:halt, event}
_ ->
{:cont, nil}
end
end),
# Remove the reported user from the object list.
comments <-
Enum.filter(objects, fn url ->
!(url == reported.url || (!is_nil(event) && event.url == url))
end),
comments <- Enum.map(comments, &Events.get_comment_from_url/1) do
%{
"reporter" => reporter,
"uri" => object["id"],
"content" => object["content"],
"reported" => reported,
"event" => event,
"comments" => comments
}
end
end
end