<?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.
*
* @author Fabien Potencier <fabien@symfony.com>
* @author Tobias Schultze <http://tobion.de>
*/
class ControllerResolver implements ControllerResolverInterface
{
private $logger;
public function __construct(LoggerInterface $logger = null)
{
$this->logger = $logger;
}
/**
* {@inheritdoc}
*/
public function getController(Request $request): callable|false
{
if (!$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)) {
if (isset($controller[0]) && \is_string($controller[0]) && isset($controller[1])) {
try {
$controller[0] = $this->instantiateController($controller[0]);
} catch (\Error|\LogicException $e) {
if (\is_callable($controller)) {
return $controller;
}
throw $e;
}
}
if (!\is_callable($controller)) {
throw new \InvalidArgumentException(sprintf('The controller for URI "%s" is not callable: ', $request->getPathInfo()).$this->getControllerError($controller));
}
return $controller;
}
if (\is_object($controller)) {
if (!\is_callable($controller)) {
throw new \InvalidArgumentException(sprintf('The controller for URI "%s" is not callable: ', $request->getPathInfo()).$this->getControllerError($controller));
}
return $controller;
}
if (\function_exists($controller)) {
return $controller;
}
try {
$callable = $this->createController($controller);
} catch (\InvalidArgumentException $e) {
throw new \InvalidArgumentException(sprintf('The controller for URI "%s" is not callable: ', $request->getPathInfo()).$e->getMessage(), 0, $e);
}
if (!\is_callable($callable)) {
throw new \InvalidArgumentException(sprintf('The controller for URI "%s" is not callable: ', $request->getPathInfo()).$this->getControllerError($callable));
}
return $callable;
}
/**
* Returns a callable for the given controller.
*
* @throws \InvalidArgumentException When the controller cannot be created
*/
protected function createController(string $controller): callable
{
if (!str_contains($controller, '::')) {
$controller = $this->instantiateController($controller);
if (!\is_callable($controller)) {
throw new \InvalidArgumentException($this->getControllerError($controller));
}
return $controller;
}
[$class, $method] = explode('::', $controller, 2);
try {
$controller = [$this->instantiateController($class), $method];
} catch (\Error|\LogicException $e) {
try {
if ((new \ReflectionMethod($class, $method))->isStatic()) {
return $class.'::'.$method;
}
} catch (\ReflectionException $reflectionException) {
throw $e;
}
throw $e;
}
if (!\is_callable($controller)) {
throw new \InvalidArgumentException($this->getControllerError($controller));
}
return $controller;
}
/**
* Returns an instantiated controller.
*/
protected function instantiateController(string $class): object
{
return new $class();
}
private function getControllerError(mixed $callable): string
{
if (\is_string($callable)) {
if (str_contains($callable, '::')) {
$callable = explode('::', $callable, 2);
} else {
return sprintf('Function "%s" does not exist.', $callable);
}
}
if (\is_object($callable)) {
$availableMethods = $this->getClassMethodsWithoutMagicMethods($callable);
$alternativeMsg = $availableMethods ? sprintf(' or use one of the available methods: "%s"', implode('", "', $availableMethods)) : '';
return sprintf('Controller class "%s" cannot be called without a method name. You need to implement "__invoke"%s.', get_debug_type($callable), $alternativeMsg);
}
if (!\is_array($callable)) {
return sprintf('Invalid type for controller given, expected string, array or object, got "%s".', get_debug_type($callable));
}
if (!isset($callable[0]) || !isset($callable[1]) || 2 !== \count($callable)) {
return 'Invalid array callable, expected [controller, method].';
}
[$controller, $method] = $callable;
if (\is_string($controller) && !class_exists($controller)) {
return sprintf('Class "%s" does not exist.', $controller);
}
$className = \is_object($controller) ? get_debug_type($controller) : $controller;
if (method_exists($controller, $method)) {
return sprintf('Method "%s" on class "%s" should be public and non-abstract.', $method, $className);
}
$collection = $this->getClassMethodsWithoutMagicMethods($controller);
$alternatives = [];
foreach ($collection as $item) {
$lev = levenshtein($method, $item);
if ($lev <= \strlen($method) / 3 || str_contains($item, $method)) {
$alternatives[] = $item;
}
}
asort($alternatives);
$message = sprintf('Expected method "%s" on class "%s"', $method, $className);
if (\count($alternatives) > 0) {
$message .= sprintf(', did you mean "%s"?', implode('", "', $alternatives));
} else {
$message .= sprintf('. Available methods: "%s".', implode('", "', $collection));
}
return $message;
}
private function getClassMethodsWithoutMagicMethods($classOrObject): array
{
$methods = get_class_methods($classOrObject);
return array_filter($methods, function (string $method) {
return 0 !== strncmp($method, '__', 2);
});
}
}
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