add ability to generate a token to retrieve the config for a specific node

app/Http/Controllers/Remote/RemoteController.php

@@ -24,10 +24,12 @@
 
 namespace Pterodactyl\Http\Controllers\Remote;
 
+use Carbon\Carbon;
 use Pterodactyl\Models;
 use Illuminate\Http\Request;
 use Pterodactyl\Http\Controllers\Controller;
 use Pterodactyl\Services\NotificationService;
+use Pterodactyl\Models\NodeConfigurationToken;
 
 class RemoteController extends Controller
 {
@@ -107,4 +109,28 @@ class RemoteController extends Controller
 
         return response('', 201);
     }
+
+    public function getConfiguration(Request $request, $tokenString) {
+        // Try to query the token and the node from the database
+        try {
+            $token = Models\NodeConfigurationToken::where('token', $tokenString)->firstOrFail();
+            $node = Models\Node::findOrFail($token->node);
+        } catch(\Illuminate\Database\Eloquent\ModelNotFoundException $e) {
+            return response(json_encode(array('error' => 'token_invalid')), 403)
+                ->header('Content-Type', 'application/json');
+        }
+
+        // Check if token is expired
+        if ($token->expires_at->lt(Carbon::now())) {
+            $token->delete();
+            return response(json_encode(array('error' => 'token_expired')), 403)
+                ->header('Content-Type', 'application/json');
+        }
+
+        // Delete the token, it's one-time use
+        $token->delete();
+
+        return response($node->getConfigurationAsJson(), 200)
+            ->header('Content-Type', 'application/json');
+    }
 }