Created action to get mercure integration info

module/Rest/src/Action/MercureAction.php

@@ -0,0 +1,56 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Shlinkio\Shlink\Rest\Action;
+
+use Cake\Chronos\Chronos;
+use Laminas\Diactoros\Response\JsonResponse;
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\ServerRequestInterface;
+use Psr\Log\LoggerInterface;
+use Shlinkio\Shlink\Common\Mercure\JwtProviderInterface;
+use Shlinkio\Shlink\Rest\Exception\MercureException;
+use Throwable;
+
+class MercureAction extends AbstractRestAction
+{
+    protected const ROUTE_PATH = '/mercure-info';
+    protected const ROUTE_ALLOWED_METHODS = [self::METHOD_GET];
+
+    private JwtProviderInterface $jwtProvider;
+    private array $mercureConfig;
+
+    public function __construct(
+        JwtProviderInterface $jwtProvider,
+        array $mercureConfig,
+        ?LoggerInterface $logger = null
+    ) {
+        parent::__construct($logger);
+        $this->jwtProvider = $jwtProvider;
+        $this->mercureConfig = $mercureConfig;
+    }
+
+    public function handle(ServerRequestInterface $request): ResponseInterface
+    {
+        $hubUrl = $this->mercureConfig['public_hub_url'] ?? null;
+        if ($hubUrl === null) {
+            throw MercureException::mercureNotConfigured();
+        }
+
+        $days = $this->mercureConfig['jwt_days_duration'] ?? 3;
+        $expiresAt = Chronos::now()->addDays($days);
+
+        try {
+            $jwt = $this->jwtProvider->buildSubscriptionToken($expiresAt);
+        } catch (Throwable $e) {
+            throw MercureException::mercureNotConfigured($e);
+        }
+
+        return new JsonResponse([
+            'mercureHubUrl' => $hubUrl,
+            'token' => $jwt,
+            'jwtExpiration' => $expiresAt->toAtomString(),
+        ]);
+    }
+}