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<?php
namespace Illuminate\Foundation\Http\Middleware;
use Closure;
use Illuminate\Contracts\Encryption\DecryptException;
use Illuminate\Contracts\Encryption\Encrypter;
use Illuminate\Contracts\Foundation\Application;
use Illuminate\Contracts\Support\Responsable;
use Illuminate\Cookie\CookieValuePrefix;
use Illuminate\Cookie\Middleware\EncryptCookies;
use Illuminate\Session\TokenMismatchException;
use Illuminate\Support\InteractsWithTime;
use Symfony\Component\HttpFoundation\Cookie;
class VerifyCsrfToken
{
use InteractsWithTime;
/**
* The application instance.
*
* @var \Illuminate\Contracts\Foundation\Application
*/
protected $app;
/**
* The encrypter implementation.
*
* @var \Illuminate\Contracts\Encryption\Encrypter
*/
protected $encrypter;
/**
* The URIs that should be excluded from CSRF verification.
*
* @var array
*/
protected $except = [];
/**
* Indicates whether the XSRF-TOKEN cookie should be set on the response.
*
* @var bool
*/
protected $addHttpCookie = true;
/**
* Create a new middleware instance.
*
* @param \Illuminate\Contracts\Foundation\Application $app
* @param \Illuminate\Contracts\Encryption\Encrypter $encrypter
* @return void
*/
public function __construct(Application $app, Encrypter $encrypter)
{
$this->app = $app;
$this->encrypter = $encrypter;
}
/**
* Handle an incoming request.
*
* @param \Illuminate\Http\Request $request
* @param \Closure $next
* @return mixed
*
* @throws \Illuminate\Session\TokenMismatchException
*/
public function handle($request, Closure $next)
{
if (
$this->isReading($request) ||
$this->runningUnitTests() ||
$this->inExceptArray($request) ||
$this->tokensMatch($request)
) {
return tap($next($request), function ($response) use ($request) {
if ($this->shouldAddXsrfTokenCookie()) {
$this->addCookieToResponse($request, $response);
}
});
}
throw new TokenMismatchException('CSRF token mismatch.');
}
/**
* Determine if the HTTP request uses a ‘read’ verb.
*
* @param \Illuminate\Http\Request $request
* @return bool
*/
protected function isReading($request)
{
return in_array($request->method(), ['HEAD', 'GET', 'OPTIONS']);
}
/**
* Determine if the application is running unit tests.
*
* @return bool
*/
protected function runningUnitTests()
{
return $this->app->runningInConsole() && $this->app->runningUnitTests();
}
/**
* Determine if the request has a URI that should pass through CSRF verification.
*
* @param \Illuminate\Http\Request $request
* @return bool
*/
protected function inExceptArray($request)
{
foreach ($this->except as $except) {
if ($except !== '/') {
$except = trim($except, '/');
}
if ($request->fullUrlIs($except) || $request->is($except)) {
return true;
}
}
return false;
}
/**
* Determine if the session and input CSRF tokens match.
*
* @param \Illuminate\Http\Request $request
* @return bool
*/
protected function tokensMatch($request)
{
$token = $this->getTokenFromRequest($request);
return is_string($request->session()->token()) &&
is_string($token) &&
hash_equals($request->session()->token(), $token);
}
/**
* Get the CSRF token from the request.
*
* @param \Illuminate\Http\Request $request
* @return string|null
*/
protected function getTokenFromRequest($request)
{
$token = $request->input('_token') ?: $request->header('X-CSRF-TOKEN');
if (! $token && $header = $request->header('X-XSRF-TOKEN')) {
try {
$token = CookieValuePrefix::remove($this->encrypter->decrypt($header, static::serialized()));
} catch (DecryptException $e) {
$token = '';
}
}
return $token;
}
/**
* Determine if the cookie should be added to the response.
*
* @return bool
*/
public function shouldAddXsrfTokenCookie()
{
return $this->addHttpCookie;
}
/**
* Add the CSRF token to the response cookies.
*
* @param \Illuminate\Http\Request $request
* @param \Symfony\Component\HttpFoundation\Response $response
* @return \Symfony\Component\HttpFoundation\Response
*/
protected function addCookieToResponse($request, $response)
{
$config = config('session');
if ($response instanceof Responsable) {
$response = $response->toResponse($request);
}
$response->headers->setCookie($this->newCookie($request, $config));
return $response;
}
/**
* Create a new "XSRF-TOKEN" cookie that contains the CSRF token.
*
* @param \Illuminate\Http\Request $request
* @param array $config
* @return \Symfony\Component\HttpFoundation\Cookie
*/
protected function newCookie($request, $config)
{
return new Cookie(
'XSRF-TOKEN',
$request->session()->token(),
$this->availableAt(60 * $config['lifetime']),
$config['path'],
$config['domain'],
$config['secure'],
false,
false,
$config['same_site'] ?? null
);
}
/**
* Determine if the cookie contents should be serialized.
*
* @return bool
*/
public static function serialized()
{
return EncryptCookies::serialized('XSRF-TOKEN');
}
}
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