Create ApiKeyHandler.php

src/middleware/ApiKeyHandler.php

+<?php
+
+class ApiKeyHandler
+{
+    private static $instance;
+    private $apiKey;
+
+    private function __construct()
+    {
+        $this->apiKey = $_ENV['API_KEY'];
+    }
+    /**
+     * @return ApiKeyHandler
+     */
+    public static function getInstance()
+    {
+        if (!isset(self::$instance)) {
+            self::$instance = new static();
+        }
+        return self::$instance;
+    }
+
+    public function checkApiKey($apiKeyHeader)
+    {
+        $res = $this->apiKey === $apiKeyHeader;
+        // if (!$res) {
+        //     throw new Exception('Invalid API Key');
+        // }
+        return $res;
+    }
+
+}
+
+
+?>
\ No newline at end of file