WIP

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

lib/federation/activity_stream/converter/conversation.ex

@@ -0,0 +1,68 @@
+defmodule Mobilizon.Federation.ActivityStream.Converter.Conversation do
+  @moduledoc """
+  Comment converter.
+
+  This module allows to convert conversations from ActivityStream format to our own
+  internal one, and back.
+  """
+
+  alias Mobilizon.Actors.Actor
+  alias Mobilizon.Conversations.Conversation
+  alias Mobilizon.Federation.ActivityPub.Actor, as: ActivityPubActor
+  alias Mobilizon.Federation.ActivityStream.{Converter, Convertible}
+  alias Mobilizon.Federation.ActivityStream.Converter.Conversation, as: ConversationConverter
+  alias Mobilizon.Storage.Repo
+  import Mobilizon.Service.Guards, only: [is_valid_string: 1]
+
+  require Logger
+
+  @behaviour Converter
+
+  defimpl Convertible, for: Conversation do
+    defdelegate model_to_as(comment), to: ConversationConverter
+  end
+
+  @doc """
+  Make an AS comment object from an existing `conversation` structure.
+  """
+  @impl Converter
+  @spec model_to_as(Conversation.t()) :: map
+  def model_to_as(%Conversation{} = conversation) do
+    conversation = Repo.preload(conversation, [:participants, last_comment: [:actor]])
+
+    %{
+      "type" => "Note",
+      "to" => Enum.map(conversation.participants, & &1.url),
+      "cc" => [],
+      "content" => conversation.last_comment.text,
+      "mediaType" => "text/html",
+      "actor" => conversation.last_comment.actor.url,
+      "id" => conversation.last_comment.url,
+      "publishedAt" => conversation.inserted_at
+    }
+  end
+
+  @impl Converter
+  @spec as_to_model_data(map) :: map() | {:error, atom()}
+  def as_to_model_data(%{"type" => "Note", "name" => name} = object) when is_valid_string(name) do
+    with %{actor_id: actor_id, creator_id: creator_id} <- extract_actors(object) do
+      %{actor_id: actor_id, creator_id: creator_id, title: name, url: object["id"]}
+    end
+  end
+
+  @spec extract_actors(map()) ::
+          %{actor_id: String.t(), creator_id: String.t()} | {:error, atom()}
+  defp extract_actors(%{"actor" => creator_url, "attributedTo" => actor_url} = _object)
+       when is_valid_string(creator_url) and is_valid_string(actor_url) do
+    with {:ok, %Actor{id: creator_id, suspended: false}} <-
+           ActivityPubActor.get_or_fetch_actor_by_url(creator_url),
+         {:ok, %Actor{id: actor_id, suspended: false}} <-
+           ActivityPubActor.get_or_fetch_actor_by_url(actor_url) do
+      %{actor_id: actor_id, creator_id: creator_id}
+    else
+      {:error, error} -> {:error, error}
+      {:ok, %Actor{url: ^creator_url}} -> {:error, :creator_suspended}
+      {:ok, %Actor{url: ^actor_url}} -> {:error, :actor_suspended}
+    end
+  end
+end