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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\HttpKernel\Controller;
use Psr\Log\LoggerInterface;
use Symfony\Component\HttpFoundation\Request;
/**
* This implementation uses the '_controller' request attribute to determine
* the controller to execute and uses the request attributes to determine
* the controller method arguments.
*
* @author Fabien Potencier <fabien@symfony.com>
*/
class ControllerResolver implements ControllerResolverInterface
{
private $logger;
/**
* If the ...$arg functionality is available.
*
* Requires at least PHP 5.6.0 or HHVM 3.9.1
*
* @var bool
*/
private $supportsVariadic;
/**
* If scalar types exists.
*
* @var bool
*/
private $supportsScalarTypes;
public function __construct(LoggerInterface $logger = null)
{
$this->logger = $logger;
$this->supportsVariadic = method_exists('ReflectionParameter', 'isVariadic');
$this->supportsScalarTypes = method_exists('ReflectionParameter', 'getType');
}
/**
* {@inheritdoc}
*
* This method looks for a '_controller' request attribute that represents
* the controller name (a string like ClassName::MethodName).
*/
public function getController(Request $request)
{
if (!$controller = $request->attributes->get('_controller')) {
if (null !== $this->logger) {
$this->logger->warning('Unable to look for the controller as the "_controller" parameter is missing.');
}
return false;
}
if (is_array($controller)) {
return $controller;
}
if (is_object($controller)) {
if (method_exists($controller, '__invoke')) {
return $controller;
}
throw new \InvalidArgumentException(sprintf('Controller "%s" for URI "%s" is not callable.', get_class($controller), $request->getPathInfo()));
}
if (false === strpos($controller, ':')) {
if (method_exists($controller, '__invoke')) {
return $this->instantiateController($controller);
} elseif (function_exists($controller)) {
return $controller;
}
}
$callable = $this->createController($controller);
if (!is_callable($callable)) {
throw new \InvalidArgumentException(sprintf('Controller "%s" for URI "%s" is not callable.', $controller, $request->getPathInfo()));
}
return $callable;
}
/**
* {@inheritdoc}
*/
public function getArguments(Request $request, $controller)
{
if (is_array($controller)) {
$r = new \ReflectionMethod($controller[0], $controller[1]);
} elseif (is_object($controller) && !$controller instanceof \Closure) {
$r = new \ReflectionObject($controller);
$r = $r->getMethod('__invoke');
} else {
$r = new \ReflectionFunction($controller);
}
return $this->doGetArguments($request, $controller, $r->getParameters());
}
/**
* @param Request $request
* @param callable $controller
* @param \ReflectionParameter[] $parameters
*
* @return array The arguments to use when calling the action
*/
protected function doGetArguments(Request $request, $controller, array $parameters)
{
$attributes = $request->attributes->all();
$arguments = array();
foreach ($parameters as $param) {
if (array_key_exists($param->name, $attributes)) {
if ($this->supportsVariadic && $param->isVariadic() && is_array($attributes[$param->name])) {
$arguments = array_merge($arguments, array_values($attributes[$param->name]));
} else {
$arguments[] = $attributes[$param->name];
}
} elseif ($param->getClass() && $param->getClass()->isInstance($request)) {
$arguments[] = $request;
} elseif ($param->isDefaultValueAvailable()) {
$arguments[] = $param->getDefaultValue();
} elseif ($this->supportsScalarTypes && $param->hasType() && $param->allowsNull()) {
$arguments[] = null;
} else {
if (is_array($controller)) {
$repr = sprintf('%s::%s()', get_class($controller[0]), $controller[1]);
} elseif (is_object($controller)) {
$repr = get_class($controller);
} else {
$repr = $controller;
}
throw new \RuntimeException(sprintf('Controller "%s" requires that you provide a value for the "$%s" argument (because there is no default value or because there is a non optional argument after this one).', $repr, $param->name));
}
}
return $arguments;
}
/**
* Returns a callable for the given controller.
*
* @param string $controller A Controller string
*
* @return callable A PHP callable
*
* @throws \InvalidArgumentException
*/
protected function createController($controller)
{
if (false === strpos($controller, '::')) {
throw new \InvalidArgumentException(sprintf('Unable to find controller "%s".', $controller));
}
list($class, $method) = explode('::', $controller, 2);
if (!class_exists($class)) {
throw new \InvalidArgumentException(sprintf('Class "%s" does not exist.', $class));
}
return array($this->instantiateController($class), $method);
}
/**
* Returns an instantiated controller.
*
* @param string $class A class name
*
* @return object
*/
protected function instantiateController($class)
{
return new $class();
}
}