How to invoke a function that accepts Request Object from another function? - php

Question

In a PHP OAuth Implementation, there is a function as below:
/**
* Processes POST requests to /oauth/token.
*/
public function token(ServerRequestInterface $request) {
// Extract the grant type from the request body.
$body = $request->getParsedBody();
$grant_type_id = !empty($body['grant_type']) ? $body['grant_type'] : 'implicit';
/*.. CODE TRIMMED ..*/
catch (OAuthServerException $exception) {
watchdog_exception('simple_oauth', $exception);
$response = $exception->generateHttpResponse(new Response());
}
return $response;
}
I think its an instance of:
Psr\Http\Message\ServerRequestInterface;
I want to call this function, and pass the body params to this function from another function. Something as below:
public function call_token(){
//Something like this??
$request = new ServerRequestInterface();
$request->setUrl('https://some.url/oauth/token');
$request->setMethod("POST");
$request->setHeader(array(
'Content-Type' => 'application/x-www-form-urlencoded',
));
$request->addPostParameter(array(
'grant_type' => 'password',
'client_id' => '828472a8-f2c5-4e79-a158-ab041d3b313a',
'client_secret' => 'secret',
'username' => 'admin',
'password' => '123'
));
$response = $token($request);
}
I am not able to figure out how we can call this function.
This is the full source code where the token code is implemented. I am trying to call this function from another class.
Below is a working CURL request of how requests are made to this endpoint. I however want to emulate the request from within the application.
$curl = curl_init();
curl_setopt_array($curl, array(
CURLOPT_URL => 'https://some.url/oauth/token',
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => '',
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 0,
CURLOPT_FOLLOWLOCATION => true,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => 'POST',
CURLOPT_POSTFIELDS => 'grant_type=password&client_id=828472a8-f2c5-4e79-a158-ab041d3b313a&client_secret=secret&username=admin&password=123',
CURLOPT_HTTPHEADER => array(
'Content-Type: application/x-www-form-urlencoded',
),
));
$response = curl_exec($curl);
curl_close($curl);
echo $response;