Simple PHP REST Router for MVC Frameworks

router.php

<?php
	/*
	 *	REST INTERNAL API
	 *	© Uday Hiwarale
	 *	Date Created : 10/05/2016
	 *	API Version : 1.0
	**/
	

	/*
	 *	Set headers
	**/
	header('Content-Type: application/json');
	http_response_code(400); //Bad Request
	
	
	/*
	 *	Start autoloading
	**/
	require_once('autoload.php');
	
	
	/*
	 *	Allow only HTTPS connections
	**/
	if(empty($_SERVER['HTTPS']) || $_SERVER['HTTPS'] == 'off'){
		exit;
	}
	
	
	/*
	 *	Get HTTP Method
	**/
	$httpMethod = strtolower($_SERVER['REQUEST_METHOD']);
	$validHttpMethods = array('get', 'post', 'put', 'patch', 'delete');
	if(!in_array($httpMethod, $validHttpMethods)){
		http_response_code(405); //Method Not Allowed
		exit;
	}
	
	
	/*
	 *	Get headers
	**/
	$authToken = (!empty($_SERVER['HTTP_X_AUTH_TOKEN'])) ? $_SERVER['HTTP_X_AUTH_TOKEN'] : ''; 
	$apiVersion = (!empty($_SERVER['HTTP_X_API_VERSION'])) ? $_SERVER['HTTP_X_API_VERSION'] : 'v1'; 
	
	
	/*
	 *	Check sign in authorization
	**/
	$authHttpMethods = array('post', 'put', 'patch', 'delete');
	if(in_array($httpMethod, $authHttpMethods)){
		if(empty($authToken)){
			http_response_code(401); //Unauthorized
			exit;
		}
		else{
			$mongo = new \MongoClient();
			$found = $mongo -> archibiz -> users -> findOne(
				array('authToken' => $authToken)
			);
			
			if(empty($found)){
				http_response_code(403); //Forbidden
				exit;
			}
		}
	}
	

	/*
	 *	Gather URL Parameters
	**/
	$routeUrl = explode("?", $_SERVER['REQUEST_URI'], 2)[0];
	$routeUrl = trim($routeUrl, '/');
	$routeUrlArr = (empty($routeUrl)) ? array() : explode('/', $routeUrl);
	
	
	/*
	 *	Get class and method name for routeUrl
	**/
	if(empty($routeUrlArr[0]) || empty($routeUrlArr[1])){
		exit;
	}
	else{
		$class = $routeUrlArr[0];
		$method = $routeUrlArr[1];
	}
	
	
	/*
	 *	Get request body
	**/
	$routeParams = array_slice($routeUrlArr, 2);
	$reqBody = (!empty(file_get_contents('php://input'))) ? json_decode(file_get_contents('php://input'), true) : array();
	
	
	/*
	 *	Create object for REST Request
	 *	Call requested method
	**/
	try{
		//Prepare class name
		$class = "api\\{$apiVersion}\\{$httpMethod}\\{$class}";
		
		//Create class object
		if($httpMethod == 'get'){
			$getParams = (!empty($_GET)) ? $_GET : array();
			$obj = new $class($routeParams, $getParams);
			$res = $obj -> $method();
			if(!empty($res)){
				echo json_encode($res);
				http_response_code(200); //Ok
			}
			else{
				http_response_code(204); //No content
			}
		}
		else if($httpMethod == 'post'){
			$obj = new $class($routeParams, $reqBody);
			$res = $obj -> $method();
		}
		else if($httpMethod == 'put'){
			$obj = new $class($routeParams, $reqBody);
			$res = $obj -> $method();
		}
		else if($httpMethod == 'patch'){
			$obj = new $class($routeParams, $reqBody);
			$res = $obj -> $method();
		}
		else if($httpMethod == 'delete'){
			$obj = new $class($routeParams);
			$res = $obj -> $method();
		}
	}
	catch(\Exception $e){
		echo $e -> getMessage();
		exit;
	}