Move to GraphQL

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

lib/mobilizon_web/schema/custom/UUID4.ex

@@ -0,0 +1,36 @@
+defmodule MobilizonWeb.Schema.Custom.UUID do
+  @moduledoc """
+  The UUID4 scalar type allows UUID compliant strings to be passed in and out.
+  Requires `{ :ecto, ">= 0.0.0" }` package: https://github.com/elixir-ecto/ecto
+  """
+  use Absinthe.Schema.Notation
+
+  alias Ecto.UUID
+
+  scalar :uuid, name: "UUID" do
+    description("""
+    The `UUID` scalar type represents UUID4 compliant string data, represented as UTF-8
+    character sequences. The UUID4 type is most often used to represent unique
+    human-readable ID strings.
+    """)
+
+    serialize(&encode/1)
+    parse(&decode/1)
+  end
+
+  @spec decode(Absinthe.Blueprint.Input.String.t()) :: {:ok, term()} | :error
+  @spec decode(Absinthe.Blueprint.Input.Null.t()) :: {:ok, nil}
+  defp decode(%Absinthe.Blueprint.Input.String{value: value}) do
+    UUID.cast(value)
+  end
+
+  defp decode(%Absinthe.Blueprint.Input.Null{}) do
+    {:ok, nil}
+  end
+
+  defp decode(_) do
+    :error
+  end
+
+  defp encode(value), do: value
+end