Imitate the REST api using url parameter based implementation

Reason for this implementation is some clients having trouble configuring the rest api either due to not having proper access to the webserver in a shared hosting environment or security restrictions. But still from icehrm frontend we need to consume the backend rest api.

core/api.php

@@ -0,0 +1,41 @@
+<?php
+define('CLIENT_PATH',dirname(__FILE__));
+include ("config.base.php");
+include ("include.common.php");
+include("server.includes.inc.php");
+
+if(\Classes\SettingsManager::getInstance()->getSetting('Api: REST Api Enabled') == '1') {
+
+    \Utils\LogManager::getInstance()->info("Request: " . $_REQUEST);
+
+    if ($_SERVER['REQUEST_METHOD'] === 'OPTIONS') {
+        http_response_code(200);
+        exit();
+    }
+
+    define('REST_API_PATH', '/');
+
+    $echoRoute = \Classes\Macaw::get(REST_API_PATH . 'echo', function () {
+        echo "Echo " . rand();
+    });
+
+    \Utils\LogManager::getInstance()->debug('Api registered URI: '.$echoRoute);
+
+    $moduleManagers = \Classes\BaseService::getInstance()->getModuleManagers();
+
+    foreach ($moduleManagers as $moduleManagerObj) {
+
+        $moduleManagerObj->setupRestEndPoints();
+    }
+    $method = $_SERVER['REQUEST_METHOD'];
+    if (strtoupper($method) === 'GET') {
+        \Classes\IceRoute::dispatch($_GET['url'], $method);
+    } else {
+        $method = strtoupper($_REQUEST['method']);
+        \Classes\IceRoute::dispatch($_REQUEST['url'], $method);
+    }
+
+
+}else{
+    echo "REST Api is not enabled. Please set 'Api: REST Api Enabled' setting to true";
+}