Allow configurable windows auth attributes

Author: stevebauman

src/Config/auth.php

@@ -62,6 +62,25 @@
 
     'login_attribute' => 'samaccountname',
 
+    /*
+    |--------------------------------------------------------------------------
+    | Windows Auth Attribute (SSO)
+    |--------------------------------------------------------------------------
+    |
+    | The windows authentication attribute is the name of the server variable
+    | that is filled when SSO authentication is performed.
+    |
+    | This is only used in conjunction with the Adldap\Laravel\Middleware\WindowsAuthenticate
+    | middleware.
+    |
+    | If your using Windows authentication this attribute must be named `AUTH_USER`.
+    |
+    | If your using Apache, this attribute must be named `REMOTE_USER`.
+    |
+    */
+
+    'windows_auth_attribute' => 'AUTH_USER',
+
     /*
     |--------------------------------------------------------------------------
     | Bind User to Model

src/Middleware/WindowsAuthenticate.php

@@ -8,6 +8,7 @@
 use Illuminate\Contracts\Auth\Guard;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Http\Request;
+use Illuminate\Support\Facades\Config;
 
 class WindowsAuthenticate
 {
@@ -40,8 +41,11 @@ public function __construct(Guard $auth)
      */
     public function handle(Request $request, Closure $next)
     {
+        // Retrieve the SSO login attribute.
+        $auth = $this->getWindowsAuthAttribute();
+
         // Handle Windows Authentication.
-        if ($account = $request->server('AUTH_USER')) {
+        if ($account = $request->server($auth)) {
             // Usernames will be prefixed with their domain,
             // we just need their account name.
             list($domain, $username) = explode('\\', $account);
@@ -83,4 +87,14 @@ public function createModel()
     {
         $this->auth->model();
     }
+
+    /**
+     * Returns the windows authentication attribute.
+     *
+     * @return string
+     */
+    protected function getWindowsAuthAttribute()
+    {
+        return Config::get('adldap_auth.windows_auth_attribute', 'AUTH_USER');
+    }
 }