Add support for Lettuce's 6.2 RedisCredentialsProvider.

We now support construction of RedisCredentialsProvider through LettuceClientConfiguration and RedisCredentialsProviderFactory.

The default implementation adapts credentials configured in RedisConfiguration objects.

Closes: #2376
Original Pull Request: #2387

src/main/java/org/springframework/data/redis/connection/lettuce/DefaultLettuceClientConfiguration.java

@@ -41,13 +41,15 @@ class DefaultLettuceClientConfiguration implements LettuceClientConfiguration {
 	private final Optional<ClientOptions> clientOptions;
 	private final Optional<String> clientName;
 	private final Optional<ReadFrom> readFrom;
+	private final Optional<RedisCredentialsProviderFactory> redisCredentialsProviderFactory;
 	private final Duration timeout;
 	private final Duration shutdownTimeout;
 	private final Duration shutdownQuietPeriod;
 
 	DefaultLettuceClientConfiguration(boolean useSsl, boolean verifyPeer, boolean startTls,
 			@Nullable ClientResources clientResources, @Nullable ClientOptions clientOptions, @Nullable String clientName,
-			@Nullable ReadFrom readFrom, Duration timeout, Duration shutdownTimeout, @Nullable Duration shutdownQuietPeriod) {
+			@Nullable ReadFrom readFrom, @Nullable RedisCredentialsProviderFactory redisCredentialsProviderFactory,
+			Duration timeout, Duration shutdownTimeout, @Nullable Duration shutdownQuietPeriod) {
 
 		this.useSsl = useSsl;
 		this.verifyPeer = verifyPeer;
@@ -56,6 +58,7 @@ class DefaultLettuceClientConfiguration implements LettuceClientConfiguration {
 		this.clientOptions = Optional.ofNullable(clientOptions);
 		this.clientName = Optional.ofNullable(clientName);
 		this.readFrom = Optional.ofNullable(readFrom);
+		this.redisCredentialsProviderFactory = Optional.ofNullable(redisCredentialsProviderFactory);
 		this.timeout = timeout;
 		this.shutdownTimeout = shutdownTimeout;
 		this.shutdownQuietPeriod = shutdownQuietPeriod != null ? shutdownQuietPeriod : shutdownTimeout;
@@ -96,6 +99,11 @@ class DefaultLettuceClientConfiguration implements LettuceClientConfiguration {
 		return readFrom;
 	}
 
+	@Override
+	public Optional<RedisCredentialsProviderFactory> getRedisCredentialsProviderFactory() {
+		return redisCredentialsProviderFactory;
+	}
+
 	@Override
 	public Duration getCommandTimeout() {
 		return timeout;

src/main/java/org/springframework/data/redis/connection/lettuce/DefaultLettucePoolingClientConfiguration.java

@@ -79,6 +79,11 @@ class DefaultLettucePoolingClientConfiguration implements LettucePoolingClientCo
 		return clientConfiguration.getReadFrom();
 	}
 
+	@Override
+	public Optional<RedisCredentialsProviderFactory> getRedisCredentialsProviderFactory() {
+		return clientConfiguration.getRedisCredentialsProviderFactory();
+	}
+
 	@Override
 	public Duration getCommandTimeout() {
 		return clientConfiguration.getCommandTimeout();

src/main/java/org/springframework/data/redis/connection/lettuce/LettuceClientConfiguration.java

@@ -94,6 +94,12 @@ public interface LettuceClientConfiguration {
 	 */
 	Optional<ReadFrom> getReadFrom();
 
+	/**
+	 * @return the optional {@link RedisCredentialsProviderFactory}.
+	 * @since 3.0
+	 */
+	Optional<RedisCredentialsProviderFactory> getRedisCredentialsProviderFactory();
+
 	/**
 	 * @return the timeout.
 	 */
@@ -166,6 +172,7 @@ public interface LettuceClientConfiguration {
 		ClientOptions clientOptions = ClientOptions.builder().timeoutOptions(TimeoutOptions.enabled()).build();
 		@Nullable String clientName;
 		@Nullable ReadFrom readFrom;
+		@Nullable RedisCredentialsProviderFactory redisCredentialsProviderFactory;
 		Duration timeout = Duration.ofSeconds(RedisURI.DEFAULT_TIMEOUT);
 		Duration shutdownTimeout = Duration.ofMillis(100);
 		@Nullable Duration shutdownQuietPeriod;
@@ -242,7 +249,7 @@ public interface LettuceClientConfiguration {
 		 *
 		 * @param readFrom must not be {@literal null}.
 		 * @return {@literal this} builder.
-		 * @throws IllegalArgumentException if clientOptions is {@literal null}.
+		 * @throws IllegalArgumentException if readFrom is {@literal null}.
 		 * @since 2.1
 		 */
 		public LettuceClientConfigurationBuilder readFrom(ReadFrom readFrom) {
@@ -253,6 +260,24 @@ public interface LettuceClientConfiguration {
 			return this;
 		}
 
+		/**
+		 * Configure a {@link RedisCredentialsProviderFactory} to obtain {@link io.lettuce.core.RedisCredentialsProvider}
+		 * instances to support credential rotation.
+		 *
+		 * @param redisCredentialsProviderFactory must not be {@literal null}.
+		 * @return {@literal this} builder.
+		 * @throws IllegalArgumentException if redisCredentialsProviderFactory is {@literal null}.
+		 * @since 3.0
+		 */
+		public LettuceClientConfigurationBuilder redisCredentialsProviderFactory(
+				RedisCredentialsProviderFactory redisCredentialsProviderFactory) {
+
+			Assert.notNull(redisCredentialsProviderFactory, "RedisCredentialsProviderFactory must not be null");
+
+			this.redisCredentialsProviderFactory = redisCredentialsProviderFactory;
+			return this;
+		}
+
 		/**
 		 * Configure a {@code clientName} to be set with {@code CLIENT SETNAME}.
 		 *
@@ -323,7 +348,7 @@ public interface LettuceClientConfiguration {
 		public LettuceClientConfiguration build() {
 
 			return new DefaultLettuceClientConfiguration(useSsl, verifyPeer, startTls, clientResources, clientOptions,
-					clientName, readFrom, timeout, shutdownTimeout, shutdownQuietPeriod);
+					clientName, readFrom, redisCredentialsProviderFactory, timeout, shutdownTimeout, shutdownQuietPeriod);
 		}
 	}
 

src/main/java/org/springframework/data/redis/connection/lettuce/LettuceConnectionFactory.java

@@ -22,6 +22,7 @@ import io.lettuce.core.ClientOptions;
 import io.lettuce.core.ReadFrom;
 import io.lettuce.core.RedisClient;
 import io.lettuce.core.RedisConnectionException;
+import io.lettuce.core.RedisCredentialsProvider;
 import io.lettuce.core.RedisURI;
 import io.lettuce.core.api.StatefulConnection;
 import io.lettuce.core.api.StatefulRedisConnection;
@@ -1216,6 +1217,15 @@ public class LettuceConnectionFactory
 
 		redisUri.setDatabase(getDatabase());
 
+		clientConfiguration.getRedisCredentialsProviderFactory().ifPresent(factory -> {
+
+			redisUri.setCredentialsProvider(factory.createCredentialsProvider(configuration));
+
+			RedisCredentialsProvider sentinelCredentials = factory
+					.createSentinelCredentialsProvider((RedisSentinelConfiguration) configuration);
+			redisUri.getSentinels().forEach(it -> it.setCredentialsProvider(sentinelCredentials));
+		});
+
 		return redisUri;
 	}
 
@@ -1267,6 +1277,10 @@ public class LettuceConnectionFactory
 		} else {
 			getRedisPassword().toOptional().ifPresent(builder::withPassword);
 		}
+
+		clientConfiguration.getRedisCredentialsProviderFactory().ifPresent(factory -> {
+			builder.withAuthentication(factory.createCredentialsProvider(configuration));
+		});
 	}
 
 	@Override
@@ -1456,6 +1470,11 @@ public class LettuceConnectionFactory
 			return Optional.empty();
 		}
 
+		@Override
+		public Optional<RedisCredentialsProviderFactory> getRedisCredentialsProviderFactory() {
+			return Optional.empty();
+		}
+
 		@Override
 		public Optional<String> getClientName() {
 			return Optional.ofNullable(clientName);

src/main/java/org/springframework/data/redis/connection/lettuce/LettucePoolingClientConfiguration.java

@@ -145,6 +145,13 @@ public interface LettucePoolingClientConfiguration extends LettuceClientConfigur
 			return this;
 		}
 
+		@Override
+		public LettucePoolingClientConfigurationBuilder redisCredentialsProviderFactory(
+				RedisCredentialsProviderFactory redisCredentialsProviderFactory) {
+			super.redisCredentialsProviderFactory(redisCredentialsProviderFactory);
+			return this;
+		}
+
 		@Override
 		public LettucePoolingClientConfigurationBuilder clientName(String clientName) {
 			super.clientName(clientName);

src/main/java/org/springframework/data/redis/connection/lettuce/RedisCredentialsProviderFactory.java

@@ -0,0 +1,111 @@
+/*
+ * Copyright 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.data.redis.connection.lettuce;
+
+import io.lettuce.core.RedisCredentials;
+import io.lettuce.core.RedisCredentialsProvider;
+import reactor.core.publisher.Mono;
+
+import org.springframework.data.redis.connection.RedisConfiguration;
+import org.springframework.data.redis.connection.RedisSentinelConfiguration;
+import org.springframework.lang.Nullable;
+
+/**
+ * Factory interface to create {@link RedisCredentialsProvider} from a {@link RedisConfiguration}. Credentials can be
+ * associated with {@link RedisCredentials#hasUsername() username} and/or {@link RedisCredentials#hasPassword()
+ * password}.
+ * <p>
+ * Credentials are based off the given {@link RedisConfiguration} objects. Changing the credentials in the actual object
+ * affects the constructed {@link RedisCredentials} object. Credentials are requested by the Lettuce client after
+ * connecting to the host. Therefore, credential retrieval is subject to complete within the configured connection
+ * creation timeout to avoid connection failures.
+ *
+ * @author Mark Paluch
+ * @since 3.0
+ */
+public interface RedisCredentialsProviderFactory {
+
+	/**
+	 * Create a {@link RedisCredentialsProvider} for data node authentication given {@link RedisConfiguration}.
+	 *
+	 * @param redisConfiguration the {@link RedisConfiguration} object.
+	 * @return a {@link RedisCredentialsProvider} that emits {@link RedisCredentials} for data node authentication.
+	 */
+	@Nullable
+	default RedisCredentialsProvider createCredentialsProvider(RedisConfiguration redisConfiguration) {
+
+		if (redisConfiguration instanceof RedisConfiguration.WithAuthentication
+				&& ((RedisConfiguration.WithAuthentication) redisConfiguration).getPassword().isPresent()) {
+
+			return RedisCredentialsProvider.from(() -> {
+
+				RedisConfiguration.WithAuthentication withAuthentication = (RedisConfiguration.WithAuthentication) redisConfiguration;
+
+				return RedisCredentials.just(withAuthentication.getUsername(), withAuthentication.getPassword().get());
+			});
+		}
+
+		return () -> Mono.just(AbsentRedisCredentials.ANONYMOUS);
+	}
+
+	/**
+	 * Create a {@link RedisCredentialsProvider} for Sentinel node authentication given
+	 * {@link RedisSentinelConfiguration}.
+	 *
+	 * @param redisConfiguration the {@link RedisSentinelConfiguration} object.
+	 * @return a {@link RedisCredentialsProvider} that emits {@link RedisCredentials} for sentinel authentication.
+	 */
+	default RedisCredentialsProvider createSentinelCredentialsProvider(RedisSentinelConfiguration redisConfiguration) {
+
+		if (redisConfiguration.getSentinelPassword().isPresent()) {
+
+			return RedisCredentialsProvider.from(() -> RedisCredentials.just(redisConfiguration.getSentinelUsername(),
+					redisConfiguration.getSentinelPassword().get()));
+		}
+
+		return () -> Mono.just(AbsentRedisCredentials.ANONYMOUS);
+	}
+
+	/**
+	 * Default anonymous {@link RedisCredentials} without username/password.
+	 */
+	enum AbsentRedisCredentials implements RedisCredentials {
+
+		ANONYMOUS;
+
+		@Override
+		@Nullable
+		public String getUsername() {
+			return null;
+		}
+
+		@Override
+		public boolean hasUsername() {
+			return false;
+		}
+
+		@Override
+		@Nullable
+		public char[] getPassword() {
+			return null;
+		}
+
+		@Override
+		public boolean hasPassword() {
+			return false;
+		}
+	}
+}