Introduce Mimirsbrunn geocoder and improve addresses & maps

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

lib/mobilizon_web/resolvers/config.ex

@@ -4,16 +4,35 @@ defmodule MobilizonWeb.Resolvers.Config do
   """
 
   alias Mobilizon.Config
+  alias Geolix.Adapter.MMDB2.Record.{Country, Location}
 
   @doc """
   Gets config.
   """
-  def get_config(_parent, _params, _context) do
+  def get_config(_parent, _params, %{
+        context: %{ip: ip}
+      }) do
+    geolix = Geolix.lookup(ip)
+
+    country_code =
+      case geolix.city do
+        %{country: %Country{iso_code: country_code}} -> String.downcase(country_code)
+        _ -> nil
+      end
+
+    location =
+      case geolix.city do
+        %{location: %Location{} = location} -> Map.from_struct(location)
+        _ -> nil
+      end
+
     {:ok,
      %{
        name: Config.instance_name(),
        registrations_open: Config.instance_registrations_open?(),
-       description: Config.instance_description()
+       description: Config.instance_description(),
+       location: location,
+       country_code: country_code
      }}
   end
 end