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<?php |
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/* |
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* This file is part of the FOSRestBundle package. |
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* |
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* (c) FriendsOfSymfony <http://friendsofsymfony.github.com/> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace FOS\RestBundle\Negotiation; |
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use FOS\RestBundle\Util\StopFormatListenerException; |
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use Negotiation\Accept; |
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use Negotiation\AcceptHeader; |
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use Negotiation\Negotiator as BaseNegotiator; |
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use Symfony\Component\HttpFoundation\Request; |
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use Symfony\Component\HttpFoundation\RequestMatcherInterface; |
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use Symfony\Component\HttpFoundation\RequestStack; |
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/** |
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* @author Ener-Getick <[email protected]> |
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*/ |
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final class FormatNegotiator extends BaseNegotiator |
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{ |
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private $map = []; |
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private $requestStack; |
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private $mimeTypes; |
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public function __construct(RequestStack $requestStack, array $mimeTypes = array()) |
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{ |
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$this->requestStack = $requestStack; |
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$this->mimeTypes = $mimeTypes; |
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} |
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public function add(RequestMatcherInterface $requestMatcher, array $options = []): void |
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{ |
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$this->map[] = [$requestMatcher, $options]; |
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} |
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public function getBest($header, array $priorities = []): ?AcceptHeader |
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{ |
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$request = $this->getRequest(); |
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$header = $header ?: $request->headers->get('Accept'); |
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foreach ($this->map as $elements) { |
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// Check if the current RequestMatcherInterface matches the current request |
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if (!$elements[0]->matches($request)) { |
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continue; |
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} |
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$options = &$elements[1]; // Do not reallow memory for this variable |
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if (!empty($options['stop'])) { |
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throw new StopFormatListenerException('Stopped format listener'); |
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} |
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if (empty($options['priorities']) && empty($priorities)) { |
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if (!empty($options['fallback_format'])) { |
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return new Accept($request->getMimeType($options['fallback_format'])); |
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} |
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continue; |
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} |
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if (isset($options['prefer_extension']) && $options['prefer_extension'] && !isset($extensionHeader)) { |
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$extension = pathinfo($request->getPathInfo(), PATHINFO_EXTENSION); |
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if (!empty($extension)) { |
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// $extensionHeader will now be either a non empty string or an empty string |
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$extensionHeader = $request->getMimeType($extension); |
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if ($extensionHeader) { |
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$header = $extensionHeader.'; q='.$options['prefer_extension'].($header ? ','.$header : ''); |
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} |
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} |
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} |
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if ($header) { |
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$mimeTypes = $this->normalizePriorities( |
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$request, |
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empty($priorities) ? $options['priorities'] : $priorities |
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); |
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$mimeType = parent::getBest($header, $mimeTypes); |
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if (null !== $mimeType) { |
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return $mimeType; |
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} |
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} |
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if (isset($options['fallback_format'])) { |
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// if false === fallback_format then we fail here instead of considering more rules |
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if (false === $options['fallback_format']) { |
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return null; |
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} |
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// stop looking at rules since we have a fallback defined |
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return new Accept($request->getMimeType($options['fallback_format'])); |
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} |
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} |
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return null; |
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} |
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private function sanitize(array $values): array |
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{ |
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return array_map(function ($value) { |
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return preg_replace('/\s+/', '', strtolower($value)); |
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}, $values); |
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} |
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/** |
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* @param string[] $priorities |
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* |
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* @return string[] formatted priorities |
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*/ |
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private function normalizePriorities(Request $request, array $priorities): array |
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{ |
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$priorities = $this->sanitize($priorities); |
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$mimeTypes = array(); |
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foreach ($priorities as $priority) { |
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if (strpos($priority, '/')) { |
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$mimeTypes[] = $priority; |
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continue; |
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} |
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$mimeTypes = array_merge($mimeTypes, Request::getMimeTypes($priority)); |
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if (isset($this->mimeTypes[$priority])) { |
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foreach ($this->mimeTypes[$priority] as $mimeType) { |
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$mimeTypes[] = $mimeType; |
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} |
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} |
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} |
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return $mimeTypes; |
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} |
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private function getRequest(): Request |
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{ |
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$request = $this->requestStack->getCurrentRequest(); |
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if (null === $request) { |
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throw new \RuntimeException('There is no current request.'); |
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} |
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return $request; |
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} |
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} |
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In PHP, under loose comparison (like
==
, or!=
, orswitch
conditions), values of different types might be equal.For
string
values, the empty string''
is a special case, in particular the following results might be unexpected: