Update README.md

Author: danieltjewett

README.md

@@ -2,22 +2,75 @@
 
 Provides Azure Authentication Middleware for a Laravel App.
 
-## Installation
+## Normal Installation
 
 1. `composer require rootinc/laravel-azure-middleware`
-2. In our routes folder (most likely `web.php`), add ```Route::get('/login/azure', '\RootInc\LaravelAzureMiddleware\Azure@azure');Route::get('/login/azurecallback', '\RootInc\LaravelAzureMiddleware\Azure@azurecallback');```
+2. In our routes folder (most likely `web.php`), add
+```php
+Route::get('/login/azure', '\RootInc\LaravelAzureMiddleware\Azure@azure');
+Route::get('/login/azurecallback', '\RootInc\LaravelAzureMiddleware\Azure@azurecallback');
+```
+
 3. In our `App\Http\Kernel.php` add `'azure' => \RootInc\LaravelAzureMiddleware\Azure::class,` most likely to the `$routeMiddleware` array.
 4. In our `.env` add `TENANT_ID, CLIENT_ID, CLIENT_SECRET and RESOURCE`.  We can get these values/read more here: https://portal.azure.com/
 5. Add the `azure` middleware to your route groups (or wherever) and enjoy :tada:
+6. If you need custom callbacks, see #Extended Installation.
 
 ## Routing
+
 `Route::get('/login/azure', '\RootInc\LaravelAzureMiddleware\Azure@azure');` First parameter can be wherever you want to route the azure login.  Change as you would like.
+
 `Route::get('/login/azurecallback', '\RootInc\LaravelAzureMiddleware\Azure@azurecallback');` First parameter can be whatever you want to route after your callback.  Change as you would like.
 
 ## Front End
 
 It's best to have an Office 365 button on our login webpage that routes to `/login/azure` (or whatever you renamed it to).  This can be as simple as an anchor tag like this `<a href="/login/azure" class="officeButton"></a>` 
 
+## Extended Installation
+
+The out-of-the-box implementation let's you login users.  However, let's say we would like to store this user into a database.  There are two callbacks that are recommended to extend from the Azure class called `success` and `fail`. The following provides information on how to extend the Root Laravel Azure Middleware Library:
+
+1. To get started (assuming we've followed the #Normal Installation directions), create a file called `AppAzure.php` in the `App\Http\Middleware` folder.  You can either do this through `artisan` or manually.
+2. Add this as a starting point in this file:
+
+```php
+<?php
+
+namespace App\Http\Middleware;
+
+use RootInc\LaravelAzureMiddleware\Azure as Azure;
+
+use App\User;
+
+class AppAzure extends Azure
+{
+    protected function success($request, $access_token, $refresh_token, $profile)
+    {
+        $email = strtolower($profile->unique_name);
+
+        $user = User::updateOrCreate(['email' => $email], [
+            'firstName' => $profile->given_name,
+            'lastName' => $profile->family_name
+        ]);
+
+        $request->session()->put('user_id', $user->id);
+
+        return parent::success($request, $access_token, $refresh_token, $profile);
+    }
+}
+```
+
+The above gives us a way to add/update users after a successful handshake.  `$profile` contains all sorts of metadata that we use to create or update our user.  More information here: https://docs.microsoft.com/en-us/azure/active-directory/develop/active-directory-protocols-oauth-code#jwt-token-claims . The default implementation redirects to `/`, so we call the parent here.  Feel free to not extend the default and to redirect elsewhere.
+
+3. Our routes need to be updated to the following:
+
+```php
+Route::get('/login/azure', '\App\Http\Middleware\AppAzure@azure');
+Route::get('/login/azurecallback', '\App\Http\Middleware\AppAzure@azurecallback');
+```
+
+4. Finally, update `Kernel.php`'s `azure` key to be `'azure' => \App\Http\Middleware\AppAzure::class,`
+
 ## Contributing
 
 TODO