Spec improvements

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

lib/mobilizon/resources/resource/metadata.ex

@@ -0,0 +1,64 @@
+defmodule Mobilizon.Resources.Resource.Metadata do
+  @moduledoc """
+  Represents a resource metadata
+  """
+
+  use Ecto.Schema
+  import Ecto.Changeset
+
+  @type t :: %__MODULE__{
+          type: String.t(),
+          title: String.t(),
+          image_remote_url: String.t(),
+          width: non_neg_integer(),
+          height: non_neg_integer(),
+          author_name: String.t(),
+          author_url: String.t(),
+          provider_name: String.t(),
+          provider_url: String.t(),
+          html: String.t(),
+          favicon_url: String.t()
+        }
+
+  @required_attrs []
+
+  @optional_attrs [
+    :type,
+    :title,
+    :description,
+    :image_remote_url,
+    :width,
+    :height,
+    :author_name,
+    :author_url,
+    :provider_name,
+    :provider_url,
+    :html,
+    :favicon_url
+  ]
+
+  @attrs @required_attrs ++ @optional_attrs
+
+  @primary_key false
+  embedded_schema do
+    field(:type, :string)
+    field(:title, :string)
+    field(:description, :string)
+    field(:image_remote_url, :string)
+    field(:width, :integer)
+    field(:height, :integer)
+    field(:author_name, :string)
+    field(:author_url, :string)
+    field(:provider_name, :string)
+    field(:provider_url, :string)
+    field(:html, :string)
+    field(:favicon_url, :string)
+  end
+
+  @doc false
+  @spec changeset(t | Ecto.Schema.t(), map) :: Ecto.Changeset.t()
+  def changeset(schema, params) do
+    schema
+    |> cast(params, @attrs)
+  end
+end