Add support for Redis sentinel username

See gh-29661

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/data/redis/RedisConnectionConfiguration.java

@@ -99,6 +99,7 @@ abstract class RedisConnectionConfiguration {
 			if (this.properties.getPassword() != null) {
 				config.setPassword(RedisPassword.of(this.properties.getPassword()));
 			}
+			config.setSentinelUsername(sentinelProperties.getUsername());
 			if (sentinelProperties.getPassword() != null) {
 				config.setSentinelPassword(RedisPassword.of(sentinelProperties.getPassword()));
 			}

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/data/redis/RedisProperties.java

@@ -377,6 +377,11 @@ public class RedisProperties {
 		 */
 		private String password;
 
+		/**
+		 * Login username for authenticating with sentinel(s).
+		 */
+		private String username;
+
 		public String getMaster() {
 			return this.master;
 		}
@@ -401,6 +406,14 @@ public class RedisProperties {
 			this.password = password;
 		}
 
+		public String getUsername() {
+			return this.username;
+		}
+
+		public void setUsername(String username) {
+			this.username = username;
+		}
+
 	}
 
 	/**

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/data/redis/RedisAutoConfigurationTests.java

@@ -315,6 +315,25 @@ class RedisAutoConfigurationTests {
 					assertThat(getUserName(connectionFactory)).isNull();
 					assertThat(connectionFactory.getPassword()).isEqualTo("password");
 					RedisSentinelConfiguration sentinelConfiguration = connectionFactory.getSentinelConfiguration();
+					assertThat(sentinelConfiguration.getSentinelUsername()).isNull();
+					assertThat(new String(sentinelConfiguration.getSentinelPassword().get())).isEqualTo("secret");
+					Set<RedisNode> sentinels = sentinelConfiguration.getSentinels();
+					assertThat(sentinels.stream().map(Object::toString).collect(Collectors.toSet()))
+							.contains("127.0.0.1:26379", "127.0.0.1:26380");
+				});
+	}
+
+	@Test
+	void testRedisConfigurationWithSentinelAuthenticationAndDataNodeAuthentication() {
+		this.contextRunner.withPropertyValues("spring.redis.username=username", "spring.redis.password=password",
+				"spring.redis.sentinel.username=sentinel", "spring.redis.sentinel.password=secret",
+				"spring.redis.sentinel.master:mymaster",
+				"spring.redis.sentinel.nodes:127.0.0.1:26379,  127.0.0.1:26380").run((context) -> {
+					LettuceConnectionFactory connectionFactory = context.getBean(LettuceConnectionFactory.class);
+					assertThat(getUserName(connectionFactory)).isEqualTo("username");
+					assertThat(connectionFactory.getPassword()).isEqualTo("password");
+					RedisSentinelConfiguration sentinelConfiguration = connectionFactory.getSentinelConfiguration();
+					assertThat(sentinelConfiguration.getSentinelUsername()).isEqualTo("sentinel");
 					assertThat(new String(sentinelConfiguration.getSentinelPassword().get())).isEqualTo("secret");
 					Set<RedisNode> sentinels = sentinelConfiguration.getSentinels();
 					assertThat(sentinels.stream().map(Object::toString).collect(Collectors.toSet()))