Add test to check SSL RestTemplate requests work against server

Add a test to `AbstractClientHttpRequestFactoriesTests` to ensure
that SSL configuration works when calling a real Tomcat server.

See gh-34810

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/web/client/ClientHttpRequestFactories.java

@@ -16,13 +16,16 @@
 
 package org.springframework.boot.web.client;
 
+import java.io.IOException;
 import java.lang.reflect.Constructor;
 import java.lang.reflect.Field;
 import java.lang.reflect.Method;
+import java.net.HttpURLConnection;
 import java.time.Duration;
 import java.util.concurrent.TimeUnit;
 import java.util.function.Supplier;
 
+import javax.net.ssl.HttpsURLConnection;
 import javax.net.ssl.SSLSocketFactory;
 import javax.net.ssl.TrustManager;
 import javax.net.ssl.X509TrustManager;
@@ -220,7 +223,9 @@ public final class ClientHttpRequestFactories {
 	static class Simple {
 
 		static SimpleClientHttpRequestFactory get(ClientHttpRequestFactorySettings settings) {
-			SimpleClientHttpRequestFactory requestFactory = new SimpleClientHttpRequestFactory();
+			SslBundle sslBundle = settings.sslBundle();
+			SimpleClientHttpRequestFactory requestFactory = (sslBundle != null)
+					? new SimpleClientHttpsRequestFactory(sslBundle) : new SimpleClientHttpRequestFactory();
 			PropertyMapper map = PropertyMapper.get().alwaysApplyingWhenNonNull();
 			map.from(settings::readTimeout).asInt(Duration::toMillis).to(requestFactory::setReadTimeout);
 			map.from(settings::connectTimeout).asInt(Duration::toMillis).to(requestFactory::setConnectTimeout);
@@ -228,6 +233,28 @@ public final class ClientHttpRequestFactories {
 			return requestFactory;
 		}
 
+		/**
+		 * {@link SimpleClientHttpsRequestFactory} to configure SSL from an
+		 * {@link SslBundle}.
+		 */
+		private static class SimpleClientHttpsRequestFactory extends SimpleClientHttpRequestFactory {
+
+			private SslBundle sslBundle;
+
+			SimpleClientHttpsRequestFactory(SslBundle sslBundle) {
+				this.sslBundle = sslBundle;
+			}
+
+			@Override
+			protected void prepareConnection(HttpURLConnection connection, String httpMethod) throws IOException {
+				if (this.sslBundle != null && connection instanceof HttpsURLConnection secureConnection) {
+					SSLSocketFactory socketFactory = this.sslBundle.createSslContext().getSocketFactory();
+					secureConnection.setSSLSocketFactory(socketFactory);
+				}
+			}
+
+		}
+
 	}
 
 	/**

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/web/client/AbstractClientHttpRequestFactoriesTests.java

@@ -16,13 +16,30 @@
 
 package org.springframework.boot.web.client;
 
+import java.net.URI;
+import java.nio.charset.StandardCharsets;
 import java.time.Duration;
 
+import javax.net.ssl.SSLHandshakeException;
+
 import org.junit.jupiter.api.Test;
 
+import org.springframework.boot.ssl.SslBundle;
+import org.springframework.boot.ssl.SslBundleKey;
+import org.springframework.boot.ssl.jks.JksSslStoreBundle;
+import org.springframework.boot.ssl.jks.JksSslStoreDetails;
+import org.springframework.boot.testsupport.web.servlet.DirtiesUrlFactories;
+import org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory;
+import org.springframework.boot.web.server.Ssl;
+import org.springframework.boot.web.server.Ssl.ClientAuth;
+import org.springframework.boot.web.server.WebServer;
+import org.springframework.http.HttpMethod;
+import org.springframework.http.client.ClientHttpRequest;
 import org.springframework.http.client.ClientHttpRequestFactory;
+import org.springframework.util.StreamUtils;
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
 
 /**
  * Base classes for testing of {@link ClientHttpRequestFactories} with different HTTP
@@ -31,6 +48,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  * @param <T> the {@link ClientHttpRequestFactory} to be produced
  * @author Andy Wilkinson
  */
+@DirtiesUrlFactories
 abstract class AbstractClientHttpRequestFactoriesTests<T extends ClientHttpRequestFactory> {
 
 	private final Class<T> requestFactoryType;
@@ -76,6 +94,39 @@ abstract class AbstractClientHttpRequestFactoriesTests<T extends ClientHttpReque
 		assertThat(readTimeout((T) requestFactory)).isEqualTo(Duration.ofSeconds(120).toMillis());
 	}
 
+	@Test
+	void connectWithSslBundle() throws Exception {
+		TomcatServletWebServerFactory webServerFactory = new TomcatServletWebServerFactory(0);
+		Ssl ssl = new Ssl();
+		ssl.setClientAuth(ClientAuth.NEED);
+		ssl.setKeyPassword("password");
+		ssl.setKeyStore("classpath:test.jks");
+		ssl.setTrustStore("classpath:test.jks");
+		webServerFactory.setSsl(ssl);
+		WebServer webServer = webServerFactory.getWebServer();
+		try {
+			webServer.start();
+			int port = webServer.getPort();
+			URI uri = new URI("https://localhost:%s".formatted(port));
+			ClientHttpRequestFactory insecureRequestFactory = ClientHttpRequestFactories
+				.get(ClientHttpRequestFactorySettings.DEFAULTS);
+			ClientHttpRequest insecureRequest = insecureRequestFactory.createRequest(uri, HttpMethod.GET);
+			assertThatExceptionOfType(SSLHandshakeException.class)
+				.isThrownBy(() -> insecureRequest.execute().getBody());
+			JksSslStoreDetails storeDetails = JksSslStoreDetails.forLocation("classpath:test.jks");
+			JksSslStoreBundle stores = new JksSslStoreBundle(storeDetails, storeDetails);
+			SslBundle sslBundle = SslBundle.of(stores, SslBundleKey.of("password"));
+			ClientHttpRequestFactory secureRequestFactory = ClientHttpRequestFactories
+				.get(ClientHttpRequestFactorySettings.DEFAULTS.withSslBundle(sslBundle));
+			ClientHttpRequest secureRequest = secureRequestFactory.createRequest(uri, HttpMethod.GET);
+			String secureResponse = StreamUtils.copyToString(secureRequest.execute().getBody(), StandardCharsets.UTF_8);
+			assertThat(secureResponse).contains("HTTP Status 404 – Not Found");
+		}
+		finally {
+			webServer.stop();
+		}
+	}
+
 	protected abstract long connectTimeout(T requestFactory);
 
 	protected abstract long readTimeout(T requestFactory);

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/web/client/ClientHttpRequestFactoriesOkHttp3Tests.java

@@ -19,6 +19,7 @@ package org.springframework.boot.web.client;
 import java.io.File;
 
 import okhttp3.OkHttpClient;
+import org.junit.jupiter.api.Disabled;
 import org.junit.jupiter.api.Test;
 
 import org.springframework.boot.testsupport.classpath.ClassPathExclusions;
@@ -66,4 +67,9 @@ class ClientHttpRequestFactoriesOkHttp3Tests
 		return ((OkHttpClient) ReflectionTestUtils.getField(requestFactory, "client")).readTimeoutMillis();
 	}
 
+	@Override
+	@Disabled("OkHostnameVerifier fails because the JSK doesn't have a type 2 SubjectAltName")
+	void connectWithSslBundle() throws Exception {
+	}
+
 }

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/web/client/ClientHttpRequestFactoriesOkHttp4Tests.java

@@ -19,6 +19,7 @@ package org.springframework.boot.web.client;
 import java.io.File;
 
 import okhttp3.OkHttpClient;
+import org.junit.jupiter.api.Disabled;
 import org.junit.jupiter.api.Test;
 
 import org.springframework.boot.testsupport.classpath.ClassPathExclusions;
@@ -64,4 +65,9 @@ class ClientHttpRequestFactoriesOkHttp4Tests
 		return ((OkHttpClient) ReflectionTestUtils.getField(requestFactory, "client")).readTimeoutMillis();
 	}
 
+	@Override
+	@Disabled("OkHostnameVerifier fails because the JSK doesn't have a type 2 SubjectAltName")
+	void connectWithSslBundle() throws Exception {
+	}
+
 }