Allow setting TLS versions via properties. WIP.

spring-cloud-commons/src/main/java/org/springframework/cloud/configuration/TLS.java

@@ -0,0 +1,55 @@
+/*
+ * Copyright 2022-2022 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.cloud.configuration;
+
+/**
+ * Represents TLS versions to be used while setting up Apache HC5 HttpClient.
+ *
+ * @author Olga Maciaszek-Sharma
+ */
+public enum TLS {
+
+	/**
+	 * Represents TLS 1.0. Not recommended due to lower security level.
+	 */
+	V_1_0("TLSv1"),
+
+	/**
+	 * Represents TLS 1.1. Not recommended due to lower security level.
+	 */
+	V_1_1("TLSv1.1"),
+
+	/**
+	 * Represents TLS 1.2.
+	 */
+	V_1_2("TLSv1.2"),
+
+	/**
+	 * Represents TLS 1.3.
+	 */
+	V_1_3("TLSv1.3");
+
+	/**
+	 * TLS version name used to match with Apache HC5 HttpClient.
+	 */
+	public final String name;
+
+	TLS(String name) {
+		this.name = name;
+	}
+
+}

spring-cloud-commons/src/main/java/org/springframework/cloud/configuration/TlsProperties.java

@@ -19,6 +19,7 @@ package org.springframework.cloud.configuration;
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.Map;
+import java.util.Set;
 
 import org.springframework.core.io.Resource;
 
@@ -47,6 +48,8 @@ public class TlsProperties {
 
 	private String trustStorePassword = "";
 
+	private Set<TLS> tlsVersions = Set.of(TLS.V_1_2, TLS.V_1_3);
+
 	private static Map<String, String> extTypes() {
 		Map<String, String> result = new HashMap<>();
 
@@ -139,6 +142,14 @@ public class TlsProperties {
 		return trustStorePassword.toCharArray();
 	}
 
+	public Set<TLS> getTlsVersions() {
+		return tlsVersions;
+	}
+
+	public void setTlsVersions(Set<TLS> tlsVersions) {
+		this.tlsVersions = tlsVersions;
+	}
+
 	private String storeTypeOf(Resource resource) {
 		String extension = fileExtensionOf(resource);
 		String type = EXTENSION_STORE_TYPES.get(extension);