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<?php |
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namespace BenTools\MercurePHP\Controller; |
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use BenTools\MercurePHP\Exception\Http\AccessDeniedHttpException; |
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use BenTools\MercurePHP\Hub\Hub; |
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use BenTools\MercurePHP\Model\Subscription; |
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use BenTools\MercurePHP\Security\Authenticator; |
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use BenTools\MercurePHP\Security\TopicMatcher; |
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use BenTools\MercurePHP\Storage\StorageInterface; |
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use Psr\Http\Message\RequestInterface; |
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use Psr\Http\Message\ResponseInterface; |
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use Psr\Http\Message\ServerRequestInterface; |
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use React\Http\Message\Response; |
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use React\Stream\ThroughStream as Stream; |
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use function BenTools\MercurePHP\nullify; |
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final class SubscriptionsController extends AbstractController |
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{ |
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private const PATH = '/.well-known/mercure/subscriptions'; |
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private const TOPIC_SELECTOR = '/.well-known/mercure/subscriptions/{topic}'; |
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private const TOPIC_AND_SUBSCRIBER_SELECTOR = '/.well-known/mercure/subscriptions/{topic}/{subscriber}'; |
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private Hub $hub; |
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private Authenticator $authenticator; |
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public function __construct(Hub $hub, Authenticator $authenticator) |
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{ |
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$this->hub = $hub; |
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$this->authenticator = $authenticator; |
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} |
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public function __invoke(ServerRequestInterface $request): ResponseInterface |
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{ |
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if (!\in_array($request->getMethod(), ['GET', 'HEAD', 'OPTIONS'])) { |
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return new Response(405); |
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} |
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$path = $request->getUri()->getPath(); |
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[$topicFilter, $subscriberFilter] = $this->extractFilters($request); |
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$token = $this->authenticator->authenticate($request); |
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if (null === $token) { |
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throw new AccessDeniedHttpException('You must be authenticated to access the Subscription API.'); |
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} |
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$claim = (array) $token->getClaim('mercure'); |
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$allowedTopics = $claim['subscribe'] ?? []; |
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$deniedTopics = $claim['subscribe_exclude'] ?? []; |
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$matchAllowedTopics = TopicMatcher::matchesTopicSelectors($path, $allowedTopics); |
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$matchDeniedTopics = TopicMatcher::matchesTopicSelectors($path, $deniedTopics); |
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if (!$matchAllowedTopics || $matchDeniedTopics) { |
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throw new AccessDeniedHttpException('You are not authorized to display these subscriptions.'); |
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} |
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$stream = new Stream(); |
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$this->sendSubscriptionsList($stream, $path, $topicFilter, $subscriberFilter, $allowedTopics, $deniedTopics); |
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$headers = [ |
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'Content-Type' => 'application/ld+json', |
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]; |
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return new Response(200, $headers, $stream); |
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} |
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public function matchRequest(RequestInterface $request): bool |
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{ |
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[$topic, $subscriber] = $this->extractFilters($request); |
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$hasTopicPattern = false !== \strpos($topic ?? '', '{'); |
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$hasSubscriberPattern = false !== \strpos($subscriber ?? '', '{'); |
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$hasBothFilters = null !== $topic && null !== $subscriber; |
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$hasNoPattern = !$hasTopicPattern && !$hasSubscriberPattern; |
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$isSubscriptionIRI = $hasBothFilters && $hasNoPattern; |
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return $this->matchesPattern($request) && !$isSubscriptionIRI; |
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} |
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private function matchesPattern(RequestInterface $request): bool |
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{ |
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$path = $request->getUri()->getPath(); |
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return TopicMatcher::matchesTopicSelectors($path, [ |
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self::PATH, |
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self::TOPIC_SELECTOR, |
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self::TOPIC_AND_SUBSCRIBER_SELECTOR, |
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]); |
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} |
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private function extractFilters(RequestInterface $request): array |
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{ |
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$path = $request->getUri()->getPath(); |
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$filters = \explode('/', \trim(\strtr($path, [self::PATH => '']), '/'), 2); |
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$topic = nullify(\urldecode($filters[0] ?? '')); |
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$subscriber = nullify(\urldecode($filters[1] ?? '')); |
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return [$topic, $subscriber]; |
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} |
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private function sendSubscriptionsList( |
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Stream $stream, |
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string $path, |
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?string $topic, |
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?string $subscriber, |
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array $allowedTopics, |
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array $deniedTopics |
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): void { |
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$this->hub->hook( |
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function () use ($stream, $path, $subscriber, $topic, $allowedTopics, $deniedTopics) { |
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$this->hub->getLastEventID()->then( |
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function (?string $lastEventId) use ( |
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$topic, |
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$subscriber, |
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$stream, |
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$path, |
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$allowedTopics, |
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$deniedTopics |
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) { |
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$this->hub->getActiveSubscriptions($topic, $subscriber) |
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->then( |
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function (iterable $subscriptions) use ( |
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$stream, |
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$path, |
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$allowedTopics, |
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$deniedTopics, |
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$lastEventId |
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) { |
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$subscriptions = $this->filterSubscriptions( |
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$subscriptions, |
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$allowedTopics, |
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$deniedTopics |
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); |
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$result = [ |
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'@context' => 'https://mercure.rocks/', |
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'id' => $path, |
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'type' => 'Subscriptions', |
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'lastEventID' => $lastEventId ?? StorageInterface::EARLIEST, |
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'subscriptions' => $subscriptions, |
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]; |
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$this->sendResult($stream, $result); |
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} |
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); |
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} |
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); |
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} |
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); |
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} |
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private function sendResult(Stream $stream, array $result): void |
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{ |
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$stream->write(\json_encode($result, \JSON_THROW_ON_ERROR)); |
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$stream->end(); |
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$stream->close(); |
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} |
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private function filterSubscriptions(iterable $subscriptions, array $allowedTopics, array $deniedTopics): array |
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{ |
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$subscriptions = \iterable_to_array($subscriptions); |
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$subscriptions = \array_filter( |
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$subscriptions, |
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function (Subscription $subscription) use ($allowedTopics, $deniedTopics) { |
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$matchAllowedTopics = TopicMatcher::matchesTopicSelectors( |
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$subscription->getId(), |
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$allowedTopics |
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); |
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$matchDeniedTopics = TopicMatcher::matchesTopicSelectors( |
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$subscription->getId(), |
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$deniedTopics |
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); |
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return $matchAllowedTopics && !$matchDeniedTopics; |
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} |
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); |
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return \array_values($subscriptions); |
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} |
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} |
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bpolaszek /
mercure-php-hub
