Expose posts media through AP

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

lib/federation/activity_stream/converter/post.ex

@@ -9,9 +9,15 @@ defmodule Mobilizon.Federation.ActivityStream.Converter.Post do
   alias Mobilizon.Federation.ActivityPub
   alias Mobilizon.Federation.ActivityPub.Utils
   alias Mobilizon.Federation.ActivityStream.{Converter, Convertible}
+  alias Mobilizon.Federation.ActivityStream.Converter.Media, as: MediaConverter
   alias Mobilizon.Posts.Post
   require Logger
 
+  import Mobilizon.Federation.ActivityStream.Converter.Utils,
+    only: [
+      process_pictures: 2
+    ]
+
   @behaviour Converter
 
   defimpl Convertible, for: Post do
@@ -20,6 +26,8 @@ defmodule Mobilizon.Federation.ActivityStream.Converter.Post do
     defdelegate model_to_as(post), to: PostConverter
   end
 
+  @banner_picture_name "Banner"
+
   @doc """
   Convert an post struct to an ActivityStream representation
   """
@@ -35,8 +43,11 @@ defmodule Mobilizon.Federation.ActivityStream.Converter.Post do
       "name" => post.title,
       "content" => post.body,
       "attributedTo" => creator_url,
-      "published" => (post.publish_at || post.inserted_at) |> to_date()
+      "published" => (post.publish_at || post.inserted_at) |> to_date(),
+      "attachment" => []
     }
+    |> maybe_add_post_picture(post)
+    |> maybe_add_inline_media(post)
   end
 
   @doc """
@@ -48,15 +59,19 @@ defmodule Mobilizon.Federation.ActivityStream.Converter.Post do
         %{"type" => "Article", "actor" => creator, "attributedTo" => group} = object
       ) do
     with {:ok, %Actor{id: attributed_to_id}} <- get_actor(group),
-         {:ok, %Actor{id: author_id}} <- get_actor(creator) do
+         {:ok, %Actor{id: author_id}} <- get_actor(creator),
+         [description: description, picture_id: picture_id, medias: medias] <-
+           process_pictures(object, attributed_to_id) do
       %{
         title: object["name"],
-        body: object["content"],
+        body: description,
         url: object["id"],
         attributed_to_id: attributed_to_id,
         author_id: author_id,
         local: false,
-        publish_at: object["published"]
+        publish_at: object["published"],
+        picture_id: picture_id,
+        medias: medias
       }
     else
       {:error, err} -> {:error, err}
@@ -70,4 +85,34 @@ defmodule Mobilizon.Federation.ActivityStream.Converter.Post do
 
   defp to_date(%DateTime{} = date), do: DateTime.to_iso8601(date)
   defp to_date(%NaiveDateTime{} = date), do: NaiveDateTime.to_iso8601(date)
+
+  @spec maybe_add_post_picture(map(), Post.t()) :: map()
+  defp maybe_add_post_picture(res, post) do
+    if is_nil(post.picture),
+      do: res,
+      else:
+        Map.update(
+          res,
+          "attachment",
+          [],
+          &(&1 ++
+              [
+                post.picture
+                |> MediaConverter.model_to_as()
+                |> Map.put("name", @banner_picture_name)
+              ])
+        )
+  end
+
+  @spec maybe_add_inline_media(map(), Post.t()) :: map()
+  defp maybe_add_inline_media(res, post) do
+    medias = Enum.map(post.media, &MediaConverter.model_to_as/1)
+
+    Map.update(
+      res,
+      "attachment",
+      [],
+      &(&1 ++ medias)
+    )
+  end
 end