[Fix #1096] Sign in with GitHub page

app/assets/stylesheets/new_design/flex.scss

@@ -16,4 +16,8 @@
   &.justify-between {
     justify-content: space-between;
   }
+
+  &.justify-center {
+    justify-content: center;
+  }
 }

app/assets/stylesheets/new_design/super_admin.scss

@@ -0,0 +1,11 @@
+@import "constants";
+
+.super-admin {
+  margin-top: 40px;
+  text-align: center;
+
+  h2 {
+    font-size: 24px;
+    margin-bottom: 4 * $default-spacer;
+  }
+}

app/controllers/administrations/sessions_controller.rb

@@ -0,0 +1,11 @@
+class Administrations::SessionsController < ApplicationController
+  layout "new_application"
+
+  def new
+  end
+
+  def destroy
+    sign_out :administration if administration_signed_in?
+    redirect_to root_path
+  end
+end

app/views/administrations/index.html.haml

@@ -13,4 +13,4 @@
     %br
 
     .text-center
-      = link_to 'Deconnexion', '/administrations/sign_out', method: :delete
+      = link_to 'Deconnexion', administrations_sign_out_path, method: :delete

app/views/administrations/sessions/new.html.haml

@@ -0,0 +1,6 @@
+.super-admin.flex.justify-center
+  %div
+    %h2 Espace Admin
+    = link_to administration_github_omniauth_authorize_path, class: "button large" do
+      %span.icon.lock
+      Connexion avec GitHub

config/routes.rb

@@ -2,8 +2,10 @@ Rails.application.routes.draw do
   get "/ping" => "ping#index", :constraints => {:ip => /127.0.0.1/}
 
   devise_for :administrations,
-    skip: [:password, :registrations],
-    controllers: { omniauth_callbacks: 'administrations/omniauth_callbacks' }
+    skip: [:password, :registrations, :sessions],
+    controllers: {
+      omniauth_callbacks: 'administrations/omniauth_callbacks'
+    }
 
   devise_for :administrateurs, controllers: {
                                  sessions: 'administrateurs/sessions'
@@ -44,6 +46,8 @@ Rails.application.routes.draw do
   get 'admin' => 'admin#index'
   get 'backoffice' => 'backoffice#index'
 
+  get 'administrations/sign_in' => 'administrations/sessions#new'
+  delete 'administrations/sign_out' => 'administrations/sessions#destroy'
   authenticate :administration do
     resources :administrations, only: [:index, :create]
     namespace :administrations do