Fix stuck HTTP2 request when sent challenge has resumed request

fixes: #23360
(cherry picked from commit b696f31)

extensions/resteasy-reactive/quarkus-resteasy-reactive/deployment/src/test/java/io/quarkus/resteasy/reactive/server/test/security/Http2FormAuthRedirectTestCase.java

@@ -0,0 +1,86 @@
+package io.quarkus.resteasy.reactive.server.test.security;
+
+import java.net.URL;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.ExecutionException;
+import java.util.function.Supplier;
+
+import org.jboss.shrinkwrap.api.ShrinkWrap;
+import org.jboss.shrinkwrap.api.asset.StringAsset;
+import org.jboss.shrinkwrap.api.spec.JavaArchive;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.RegisterExtension;
+
+import io.quarkus.security.test.utils.TestIdentityController;
+import io.quarkus.security.test.utils.TestIdentityProvider;
+import io.quarkus.test.QuarkusUnitTest;
+import io.quarkus.test.common.http.TestHTTPResource;
+import io.quarkus.vertx.http.runtime.QuarkusHttpHeaders;
+import io.vertx.core.MultiMap;
+import io.vertx.core.Vertx;
+import io.vertx.core.buffer.Buffer;
+import io.vertx.core.http.HttpVersion;
+import io.vertx.ext.web.client.HttpResponse;
+import io.vertx.ext.web.client.WebClient;
+import io.vertx.ext.web.client.WebClientOptions;
+
+public class Http2FormAuthRedirectTestCase {
+
+    @TestHTTPResource(value = "/j_security_check", ssl = true)
+    URL sslUrl;
+
+    @RegisterExtension
+    static QuarkusUnitTest test = new QuarkusUnitTest().setArchiveProducer(new Supplier<>() {
+        @Override
+        public JavaArchive get() {
+            return ShrinkWrap.create(JavaArchive.class)
+                    .addClasses(TestIdentityProvider.class, TestIdentityController.class)
+                    .addAsResource(new StringAsset("quarkus.http.auth.form.enabled=true\n" +
+                            "quarkus.http.insecure-requests=disabled\n" +
+                            "quarkus.http.ssl.certificate.key-store-file=server-keystore.jks\n" +
+                            "quarkus.http.ssl.certificate.key-store-password=secret"), "application.properties")
+                    .addAsResource("server-keystore.jks");
+        }
+    });
+
+    @BeforeAll
+    public static void setup() {
+        TestIdentityController.resetRoles().add("a d m i n", "a d m i n", "a d m i n");
+    }
+
+    @Test
+    public void testFormAuthFailure() {
+        Vertx vertx = Vertx.vertx();
+        try {
+            WebClientOptions options = new WebClientOptions()
+                    .setSsl(true)
+                    .setVerifyHost(false)
+                    .setTrustAll(true)
+                    .setProtocolVersion(HttpVersion.HTTP_2)
+                    .setFollowRedirects(false)
+                    .setUseAlpn(true);
+            CompletableFuture<Integer> result = new CompletableFuture<>();
+            MultiMap formParams = new QuarkusHttpHeaders()
+                    .add("j_username", "a d m i n")
+                    .add("j_password", "wrongpassword");
+            WebClient.create(vertx, options)
+                    .post(sslUrl.getPort(), sslUrl.getHost(), sslUrl.getPath())
+                    .sendForm(formParams, ar -> {
+                        if (ar.succeeded()) {
+                            HttpResponse<Buffer> response = ar.result();
+                            result.complete(response.statusCode());
+                        } else {
+                            result.completeExceptionally(ar.cause());
+                        }
+                    });
+            Assertions.assertEquals(302, result.get());
+        } catch (ExecutionException | InterruptedException e) {
+            Assertions.fail(e.getMessage());
+        } finally {
+            vertx.close();
+        }
+    }
+
+}

extensions/vertx-http/runtime/src/main/java/io/quarkus/vertx/http/runtime/security/HttpAuthenticator.java

@@ -136,9 +136,11 @@ public Uni<SecurityIdentity> apply(SecurityIdentity data) {
      */
     public Uni<Boolean> sendChallenge(RoutingContext routingContext) {
         //we want to consume any body content if present
-        //challenges won't read the body, and if we don't consume
-        //things can get stuck
-        routingContext.request().resume();
+        //challenges won't read the body and didn't resume context themselves
+        //as if we don't consume things can get stuck
+        if (!routingContext.request().isEnded()) {
+            routingContext.request().resume();
+        }
         Uni<Boolean> result = null;
 
         // we only require auth mechanism to put itself into routing context when there is more than one mechanism registered