/**
* Any implementing HTTP providers should send a request to the provided endpoint with the parameters.
* They should return, in string form, the response body and throw an exception on error.
*
* @param UriInterface $endpoint
* @param mixed $requestBody
* @param array $extraHeaders
* @param string $method
*
* @return string
*
* @throws TokenResponseException
* @throws \InvalidArgumentException
*/
public function retrieveResponse(UriInterface $endpoint, $requestBody, array $extraHeaders = array(), $method = 'POST')
{
// Normalize method name
$method = strtoupper($method);
$this->normalizeHeaders($extraHeaders);
if ($method === 'GET' && !empty($requestBody)) {
throw new \InvalidArgumentException('No body expected for "GET" request.');
}
if (!isset($extraHeaders['Content-type']) && $method === 'POST' && is_array($requestBody)) {
$extraHeaders['Content-type'] = 'Content-type: application/x-www-form-urlencoded';
}
$host = 'Host: ' . $endpoint->getHost();
// Append port to Host if it has been specified
if ($endpoint->hasExplicitPortSpecified()) {
$host .= ':' . $endpoint->getPort();
}
$extraHeaders['Host'] = $host;
$extraHeaders['Connection'] = 'Connection: close';
if (is_array($requestBody)) {
$requestBody = http_build_query($requestBody, '', '&');
}
$extraHeaders['Content-length'] = 'Content-length: ' . strlen($requestBody);
$context = $this->generateStreamContext($requestBody, $extraHeaders, $method);
$level = error_reporting(0);
$response = file_get_contents($endpoint->getAbsoluteUri(), false, $context);
error_reporting($level);
if (false === $response) {
$lastError = error_get_last();
if (is_null($lastError)) {
throw new TokenResponseException('Failed to request resource.');
}
throw new TokenResponseException($lastError['message']);
}
return $response;
}
