add france connect logout process

app/controllers/users/sessions_controller.rb

@@ -10,14 +10,26 @@ class Users::SessionsController < Devise::SessionsController
   def create
     super
 
-    current_user.login_with_france_connect = false
-    current_user.save
+    current_user.update_attributes(login_with_france_connect: false)
   end
 
   # DELETE /resource/sign_out
-  # def destroy
-  #   super
-  # end
+  def destroy
+    connected_with_france_connect = current_user.login_with_france_connect
+    current_user.update_attributes(login_with_france_connect: false)
+
+
+    signed_out = (Devise.sign_out_all_scopes ? sign_out : sign_out(resource_name))
+    set_flash_message :notice, :signed_out if signed_out && is_flashing_format?
+    yield if block_given?
+
+
+    if connected_with_france_connect
+      redirect_to FRANCE_CONNECT.logout_endpoint
+    else
+      respond_to_on_destroy
+    end
+  end
 
   # protected
 

app/models/france_connect_client.rb

@@ -4,10 +4,13 @@ class FranceConnectClient < OpenIDConnect::Client
     super(
         identifier: FRANCE_CONNECT.identifier,
         secret: FRANCE_CONNECT.secret,
+
         redirect_uri: FRANCE_CONNECT.redirect_uri,
+
         authorization_endpoint: FRANCE_CONNECT.authorization_endpoint,
         token_endpoint: FRANCE_CONNECT.token_endpoint,
-        userinfo_endpoint: FRANCE_CONNECT.userinfo_endpoint
+        userinfo_endpoint: FRANCE_CONNECT.userinfo_endpoint,
+        logout_endpoint: FRANCE_CONNECT.logout_endpoint
     )
     self.authorization_code = params[:code] if params.has_key? :code
   end