Add blurhash support to backend

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

lib/mobilizon/medias/media.ex

@@ -5,21 +5,32 @@ defmodule Mobilizon.Medias.Media do
 
   use Ecto.Schema
 
-  import Ecto.Changeset, only: [cast: 3, cast_embed: 2]
+  import Ecto.Changeset, only: [cast: 3, cast_embed: 2, cast_embed: 3]
 
   alias Mobilizon.Actors.Actor
   alias Mobilizon.Discussions.Comment
   alias Mobilizon.Events.Event
   alias Mobilizon.Medias.File
+  alias Mobilizon.Medias.Media.Metadata
   alias Mobilizon.Posts.Post
 
   @type t :: %__MODULE__{
           file: File.t(),
+          metadata: Metadata.t(),
           actor: Actor.t()
         }
 
+  @metadata_attrs [:height, :width, :blurhash]
+
   schema "medias" do
     embeds_one(:file, File, on_replace: :update)
+
+    embeds_one :metadata, Metadata, on_replace: :update do
+      field(:height, :integer)
+      field(:width, :integer)
+      field(:blurhash, :string)
+    end
+
     belongs_to(:actor, Actor)
     has_many(:event_picture, Event, foreign_key: :picture_id)
     many_to_many(:events, Event, join_through: "events_medias")
@@ -36,5 +47,13 @@ defmodule Mobilizon.Medias.Media do
     media
     |> cast(attrs, [:actor_id])
     |> cast_embed(:file)
+    |> cast_embed(:metadata, with: &metadata_changeset/2)
+  end
+
+  @doc false
+  @spec changeset(struct(), map) :: Ecto.Changeset.t()
+  def metadata_changeset(metadata, attrs) do
+    metadata
+    |> cast(attrs, @metadata_attrs)
   end
 end