Use route parameter for idpName

From PR feedback, use routeParam to get the idpName.
Removes need for hardcoded list of routes built by for-loop,
and in controller ctor, removes need for (awkward) request path
parsing.
Instead, just abort(404) if the `$idpName` is not in the configured list

Tested, works with and without routesPrefix defined.

README.md

@@ -86,7 +86,7 @@ $metadata['http://laravel_url/myidp1/metadata'] = array(
 
 ### Usage
 
-When you want your user to login, just redirect to the login route configured for the particular IDP, `route('myIdp1_login')`. You can also instantiate a `Saml2Auth` for the desired IDP using the `Saml2Auth::loadOneLoginAuthFromIpdConfig()` function to load the config and construct the OneLogin auth argment; just remember that it does not use any session storage, so if you ask it to login it will redirect to the IDP whether the user is already logged in or not. For example, you can change your authentication middleware.
+When you want your user to login, just redirect to the login route configured for the particular IDP, `route('saml2_login', 'myIdp1')`. You can also instantiate a `Saml2Auth` for the desired IDP using the `Saml2Auth::loadOneLoginAuthFromIpdConfig('myIdp1')` function to load the config and construct the OneLogin auth argment; just remember that it does not use any session storage, so if you ask it to login it will redirect to the IDP whether the user is already logged in or not. For example, you can change your authentication middleware.
 ```php
 public function handle($request, Closure $next)
 {

src/Aacotroneo/Saml2/Http/Controllers/Saml2Controller.php

@@ -17,17 +17,14 @@ class Saml2Controller extends Controller
     protected $idp;
 
     /**
-     * @param Saml2Auth $saml2Auth injected.
      */
-    function __construct($idpName){
-        if (empty($idpName)) {
-            // Get IDP name from path. IdP name is *2nd-to-last* item in path, whether
-            // using routesPrefix ("routesPrefix/idpName/page") or no routesPrefix ("idpName/page")
-            $pathSegments = request()->segments();
-            $idpName = $pathSegments[count($pathSegments)-2];
+    function __construct(){
+        $idpName = request()->route('idpName');
+        if (!in_array($idpName, config('saml2_settings.idpNames'))) {
+            abort(404);
         }
-        $this->idp = $idpName ?: 'test';
 
+        $this->idp = $idpName;
         $auth = Saml2Auth::loadOneLoginAuthFromIpdConfig($this->idp);
         $this->saml2Auth = new Saml2Auth($auth);
     }

src/Aacotroneo/Saml2/Saml2Auth.php

@@ -44,14 +44,14 @@ public static function loadOneLoginAuthFromIpdConfig($idpName)
         $config = config('saml2.'.$idpName.'_idp_settings');
 
         if (empty($config['sp']['entityId'])) {
-            $config['sp']['entityId'] = URL::route($idpName.'_metadata');
+            $config['sp']['entityId'] = URL::route('saml2_metadata', $idpName);
         }
         if (empty($config['sp']['assertionConsumerService']['url'])) {
-            $config['sp']['assertionConsumerService']['url'] = URL::route($idpName.'_acs');
+            $config['sp']['assertionConsumerService']['url'] = URL::route('saml2_acs', $idpName);
         }
         if (!empty($config['sp']['singleLogoutService']) &&
             empty($config['sp']['singleLogoutService']['url'])) {
-            $config['sp']['singleLogoutService']['url'] = URL::route($idpName.'_sls');
+            $config['sp']['singleLogoutService']['url'] = URL::route('saml2_sls', $idpName);
         }
         if (strpos($config['sp']['privateKey'], 'file://')===0) {
             $config['sp']['privateKey'] = $this->extractPkeyFromFile($config['sp']['privateKey']);

src/routes.php

@@ -1,36 +1,31 @@
 <?php
 
-foreach (config('saml2_settings.idpNames') as $key => $value) {
-
-    Route::group([
-        'prefix' => config('saml2_settings.routesPrefix').'/'.$value,
-        'middleware' => config('saml2_settings.routesMiddleware'),
-    ], function () use ($value) {
-
+Route::middleware(config('saml2_settings.routesMiddleware'))
+->prefix(config('saml2_settings.routesPrefix').'/')->group(function() {
+    Route::prefix('{idpName}')->group(function() {
         Route::get('/logout', array(
-            'as' => $value.'_logout',
+            'as' => 'saml2_logout',
             'uses' => 'Aacotroneo\Saml2\Http\Controllers\Saml2Controller@logout',
         ));
 
         Route::get('/login', array(
-            'as' => $value.'_login',
+            'as' => 'saml2_login',
             'uses' => 'Aacotroneo\Saml2\Http\Controllers\Saml2Controller@login',
         ));
 
         Route::get('/metadata', array(
-            'as' => $value.'_metadata',
+            'as' => 'saml2_metadata',
             'uses' => 'Aacotroneo\Saml2\Http\Controllers\Saml2Controller@metadata',
         ));
 
         Route::post('/acs', array(
-            'as' => $value.'_acs',
+            'as' => 'saml2_acs',
             'uses' => 'Aacotroneo\Saml2\Http\Controllers\Saml2Controller@acs',
         ));
 
         Route::get('/sls', array(
-            'as' => $value.'_sls',
+            'as' => 'saml2_sls',
             'uses' => 'Aacotroneo\Saml2\Http\Controllers\Saml2Controller@sls',
         ));
     });
-
-}
+});