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<?php
/*
* This file is part of asm89/stack-cors.
*
* (c) Alexander <iam.asm89@gmail.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Asm89\Stack;
use Symfony\Component\HttpKernel\HttpKernelInterface;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
class CorsService
{
private $options;
public function __construct(array $options = array())
{
$this->options = $this->normalizeOptions($options);
}
private function normalizeOptions(array $options = array())
{
$options += array(
'allowedOrigins' => array(),
'allowedOriginsPatterns' => array(),
'supportsCredentials' => false,
'allowedHeaders' => array(),
'exposedHeaders' => array(),
'allowedMethods' => array(),
'maxAge' => 0,
);
// normalize array('*') to true
if (in_array('*', $options['allowedOrigins'])) {
$options['allowedOrigins'] = true;
}
if (in_array('*', $options['allowedHeaders'])) {
$options['allowedHeaders'] = true;
} else {
$options['allowedHeaders'] = array_map('strtolower', $options['allowedHeaders']);
}
if (in_array('*', $options['allowedMethods'])) {
$options['allowedMethods'] = true;
} else {
$options['allowedMethods'] = array_map('strtoupper', $options['allowedMethods']);
}
return $options;
}
public function isActualRequestAllowed(Request $request)
{
return $this->checkOrigin($request);
}
public function isCorsRequest(Request $request)
{
return $request->headers->has('Origin') && !$this->isSameHost($request);
}
public function isPreflightRequest(Request $request)
{
return $this->isCorsRequest($request)
&& $request->getMethod() === 'OPTIONS'
&& $request->headers->has('Access-Control-Request-Method');
}
public function addActualRequestHeaders(Response $response, Request $request)
{
if (!$this->checkOrigin($request)) {
return $response;
}
$response->headers->set('Access-Control-Allow-Origin', $request->headers->get('Origin'));
if (!$response->headers->has('Vary')) {
$response->headers->set('Vary', 'Origin');
} else {
$response->headers->set('Vary', $response->headers->get('Vary') . ', Origin');
}
if ($this->options['supportsCredentials']) {
$response->headers->set('Access-Control-Allow-Credentials', 'true');
}
if ($this->options['exposedHeaders']) {
$response->headers->set('Access-Control-Expose-Headers', implode(', ', $this->options['exposedHeaders']));
}
return $response;
}
public function handlePreflightRequest(Request $request)
{
if (true !== $check = $this->checkPreflightRequestConditions($request)) {
return $check;
}
return $this->buildPreflightCheckResponse($request);
}
private function buildPreflightCheckResponse(Request $request)
{
$response = new Response();
if ($this->options['supportsCredentials']) {
$response->headers->set('Access-Control-Allow-Credentials', 'true');
}
$response->headers->set('Access-Control-Allow-Origin', $request->headers->get('Origin'));
if ($this->options['maxAge']) {
$response->headers->set('Access-Control-Max-Age', $this->options['maxAge']);
}
$allowMethods = $this->options['allowedMethods'] === true
? strtoupper($request->headers->get('Access-Control-Request-Method'))
: implode(', ', $this->options['allowedMethods']);
$response->headers->set('Access-Control-Allow-Methods', $allowMethods);
$allowHeaders = $this->options['allowedHeaders'] === true
? strtoupper($request->headers->get('Access-Control-Request-Headers'))
: implode(', ', $this->options['allowedHeaders']);
$response->headers->set('Access-Control-Allow-Headers', $allowHeaders);
$response->setStatusCode(204);
return $response;
}
private function checkPreflightRequestConditions(Request $request)
{
if (!$this->checkOrigin($request)) {
return $this->createBadRequestResponse(403, 'Origin not allowed');
}
if (!$this->checkMethod($request)) {
return $this->createBadRequestResponse(405, 'Method not allowed');
}
$requestHeaders = array();
// if allowedHeaders has been set to true ('*' allow all flag) just skip this check
if ($this->options['allowedHeaders'] !== true && $request->headers->has('Access-Control-Request-Headers')) {
$headers = strtolower($request->headers->get('Access-Control-Request-Headers'));
$requestHeaders = array_filter(explode(',', $headers));
foreach ($requestHeaders as $header) {
if (!in_array(trim($header), $this->options['allowedHeaders'])) {
return $this->createBadRequestResponse(403, 'Header not allowed');
}
}
}
return true;
}
private function createBadRequestResponse($code, $reason = '')
{
return new Response($reason, $code);
}
private function isSameHost(Request $request)
{
return $request->headers->get('Origin') === $request->getSchemeAndHttpHost();
}
private function checkOrigin(Request $request)
{
if ($this->options['allowedOrigins'] === true) {
// allow all '*' flag
return true;
}
$origin = $request->headers->get('Origin');
if (in_array($origin, $this->options['allowedOrigins'])) {
return true;
}
foreach ($this->options['allowedOriginsPatterns'] as $pattern) {
if (preg_match($pattern, $origin)) {
return true;
}
}
return false;
}
private function checkMethod(Request $request)
{
if ($this->options['allowedMethods'] === true) {
// allow all '*' flag
return true;
}
$requestMethod = strtoupper($request->headers->get('Access-Control-Request-Method'));
return in_array($requestMethod, $this->options['allowedMethods']);
}
}