Slim v2 to Slim v3 Upgrade - php

Question

I have been using Slim v2 for my APIs and am thinking about upgrading to v3.
Unfortunately I have limited experience and could use your help on a code example below.
This is the login code:
$app->post('/register', function() use ($app) {
// check for required params
verifyRequiredParams(array('name', 'email', 'password'));
$response = array();
// reading post params
$name = $app->request->post('name');
$email = $app->request->post('email');
$password = $app->request->post('password');
// validating email address
validateEmail($email);
$db = new DbHandler();
$res = $db->createUser($name, $email, $password);
if ($res == USER_CREATED_SUCCESSFULLY) {
$response["error"] = false;
$response["message"] = "You are successfully registered";
} else if ($res == USER_CREATE_FAILED) {
$response["error"] = true;
$response["message"] = "Oops! An error occurred while registereing";
} else if ($res == USER_ALREADY_EXISTED) {
$response["error"] = true;
$response["message"] = "Sorry, this email already existed";
}
// echo json response
echoRespnse(201, $response);
});
Here is the validateEmail function:
function validateEmail($email) {
$app = \Slim\Slim::getInstance();
if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
$response["error"] = true;
$response["message"] = 'Email address is not valid';
echoRespnse(400, $response);
$app->stop();
}
}
How do I get an Instance of app in Slim v3 to actually stop the app when input criteria are not met?
I would appreciate it if you could give me an example with the help of my code.
Thanks for the help!
EDIT
The above issue was solved. Unfortunately, a new issue arose after checking my code.
I have a middle layer to authenticate the user:
function authenticate(\Slim\Route $route) {
// Getting request headers
$headers = apache_request_headers();
$response = array();
$app = \Slim\Slim::getInstance();
// Verifying Authorization Header
if (isset($headers['Authorization'])) {
//omitted code
} else {
// api key is missing in header
$response["error"] = true;
$response["message"] = "Api key is misssing";
echoRespnse(400, $response);
$app->stop();
}
In my main code i implement function authenticate as follows:
$app->get('/tasks', 'authenticate', function() {
global $user_id;
$response = array();
$db = new DbHandler();
//ommit some code
echoRespnse(200, $response);
});
Would you know how to do this in Slim v3?
I would really appreciate your help.

Answer 1

In Slim3, return $response (return Response object) is a better way to stop app.
So how is the below?
$app->post('/register', function($request, $response, $args) {
// omit some codes
if(!validateEmail($request->getParsedBodyParam('email'))){
return $response->withJson(['message' => 'Email address is not valid', 'error' => true], 400);
}
// omit some codes
}
validateEmail function is changed to like below.
function validateEmail($email) {
if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
return false
}
return true;
}
Hope it will help you.