[Fix #1096] Github Oauth

app/controllers/administrations/omniauth_callbacks_controller.rb

@@ -0,0 +1,16 @@
+class Administrations::OmniauthCallbacksController < Devise::OmniauthCallbacksController
+  def github
+    administration = Administration.from_omniauth(request.env["omniauth.auth"])
+    if administration.present?
+      sign_in administration
+      redirect_to administrations_path
+    else
+      flash[:alert] = "Compte GitHub non autorisé"
+      redirect_to root_path
+    end
+  end
+
+  def failure
+    redirect_to root_path
+  end
+end