Improve Redis URL validation

This commit improves the validation of URLs provided in the property
'spring.redis.url' used to auto-configure a Spring Data Redis
connection. In particular, only the URL schemes 'redis://' and
'rediss://' are allowed, and any other scheme will result in a
configuration error. A failure analyzer is also provided to improve
diagnostics for common mis-configurations detected by this validation.

Fixes gh-21999

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

@@ -36,6 +36,7 @@
  * @author Mark Paluch
  * @author Stephane Nicoll
  * @author Alen Turkovic
+ * @author Scott Frederick
  */
 abstract class RedisConnectionConfiguration {
 
@@ -135,7 +136,11 @@ private List<RedisNode> createSentinels(RedisProperties.Sentinel sentinel) {
 	protected ConnectionInfo parseUrl(String url) {
 		try {
 			URI uri = new URI(url);
-			boolean useSsl = (url.startsWith("rediss://"));
+			String scheme = uri.getScheme();
+			if (!"redis".equals(scheme) && !"rediss".equals(scheme)) {
+				throw new RedisUrlSyntaxException(url);
+			}
+			boolean useSsl = ("rediss".equals(scheme));
 			String password = null;
 			if (uri.getUserInfo() != null) {
 				password = uri.getUserInfo();
@@ -147,7 +152,7 @@ protected ConnectionInfo parseUrl(String url) {
 			return new ConnectionInfo(uri, useSsl, password);
 		}
 		catch (URISyntaxException ex) {
-			throw new IllegalArgumentException("Malformed url '" + url + "'", ex);
+			throw new RedisUrlSyntaxException(url, ex);
 		}
 	}
 

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

@@ -0,0 +1,46 @@
+/*
+ * Copyright 2012-2020 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.boot.autoconfigure.data.redis;
+
+/**
+ * Exception thrown when a Redis URL is malformed or invalid.
+ *
+ * @author Scott Frederick
+ */
+class RedisUrlSyntaxException extends RuntimeException {
+
+	private final String url;
+
+	RedisUrlSyntaxException(String url, Exception cause) {
+		super(buildMessage(url), cause);
+		this.url = url;
+	}
+
+	RedisUrlSyntaxException(String url) {
+		super(buildMessage(url));
+		this.url = url;
+	}
+
+	String getUrl() {
+		return this.url;
+	}
+
+	private static String buildMessage(String url) {
+		return "Invalid Redis URL '" + url + "'";
+	}
+
+}

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

@@ -0,0 +1,68 @@
+/*
+ * Copyright 2012-2020 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.boot.autoconfigure.data.redis;
+
+import java.net.URI;
+import java.net.URISyntaxException;
+
+import org.springframework.boot.diagnostics.AbstractFailureAnalyzer;
+import org.springframework.boot.diagnostics.FailureAnalysis;
+
+/**
+ * A {@code FailureAnalyzer} that performs analysis of failures caused by a
+ * {@link RedisUrlSyntaxException}.
+ *
+ * @author Scott Frederick
+ */
+class RedisUrlSyntaxFailureAnalyzer extends AbstractFailureAnalyzer<RedisUrlSyntaxException> {
+
+	@Override
+	protected FailureAnalysis analyze(Throwable rootFailure, RedisUrlSyntaxException cause) {
+		try {
+			URI uri = new URI(cause.getUrl());
+			if ("redis-sentinel".equals(uri.getScheme())) {
+				return new FailureAnalysis(getUnsupportedSchemeDescription(cause.getUrl(), uri.getScheme()),
+						"Use spring.redis.sentinel properties instead of spring.redis.url to configure Redis sentinel addresses.",
+						cause);
+			}
+			if ("redis-socket".equals(uri.getScheme())) {
+				return new FailureAnalysis(getUnsupportedSchemeDescription(cause.getUrl(), uri.getScheme()),
+						"Configure the appropriate Spring Data Redis connection beans directly instead of setting the property 'spring.redis.url'.",
+						cause);
+			}
+			if (!"redis".equals(uri.getScheme()) && !"rediss".equals(uri.getScheme())) {
+				return new FailureAnalysis(getUnsupportedSchemeDescription(cause.getUrl(), uri.getScheme()),
+						"Use the scheme 'redis://` for insecure or `rediss://` for secure Redis standalone configuration.",
+						cause);
+			}
+		}
+		catch (URISyntaxException ex) {
+			// fall through to default description and action
+		}
+		return new FailureAnalysis(getDefaultDescription(cause.getUrl()),
+				"Review the value of the property 'spring.redis.url'.", cause);
+	}
+
+	private String getDefaultDescription(String url) {
+		return "The URL '" + url + "' is not valid for configuring Spring Data Redis. ";
+	}
+
+	private String getUnsupportedSchemeDescription(String url, String scheme) {
+		return getDefaultDescription(url) + "The scheme '" + scheme + "' is not supported.";
+	}
+
+}

spring-boot-project/spring-boot-autoconfigure/src/main/resources/META-INF/spring.factories

@@ -149,6 +149,7 @@ org.springframework.boot.autoconfigure.webservices.client.WebServiceTemplateAuto
 
 # Failure analyzers
 org.springframework.boot.diagnostics.FailureAnalyzer=\
+org.springframework.boot.autoconfigure.data.redis.RedisUrlSyntaxFailureAnalyzer,\
 org.springframework.boot.autoconfigure.diagnostics.analyzer.NoSuchBeanDefinitionFailureAnalyzer,\
 org.springframework.boot.autoconfigure.flyway.FlywayMigrationScriptMissingFailureAnalyzer,\
 org.springframework.boot.autoconfigure.jdbc.DataSourceBeanCreationFailureAnalyzer,\

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

@@ -48,6 +48,7 @@
 import org.springframework.util.StringUtils;
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatIllegalStateException;
 
 /**
  * Tests for {@link RedisAutoConfiguration}.
@@ -60,6 +61,7 @@
  * @author Mark Paluch
  * @author Stephane Nicoll
  * @author Alen Turkovic
+ * @author Scott Frederick
  */
 class RedisAutoConfigurationTests {
 
@@ -228,6 +230,17 @@ void testRedisConfigurationWithSentinelPasswordAndDataNodePassword() {
 				});
 	}
 
+	@Test
+	void testRedisSentinelUrlConfiguration() {
+		this.contextRunner
+				.withPropertyValues(
+						"spring.redis.url=redis-sentinel://username:password@127.0.0.1:26379,127.0.0.1:26380/mymaster")
+				.run((context) -> assertThatIllegalStateException()
+						.isThrownBy(() -> context.getBean(LettuceConnectionFactory.class))
+						.withRootCauseInstanceOf(RedisUrlSyntaxException.class).havingRootCause().withMessageContaining(
+								"Invalid Redis URL 'redis-sentinel://username:password@127.0.0.1:26379,127.0.0.1:26380/mymaster'"));
+	}
+
 	@Test
 	void testRedisConfigurationWithCluster() {
 		List<String> clusterNodes = Arrays.asList("127.0.0.1:27379", "127.0.0.1:27380");

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

@@ -0,0 +1,69 @@
+/*
+ * Copyright 2012-2020 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.boot.autoconfigure.data.redis;
+
+import org.junit.jupiter.api.Test;
+
+import org.springframework.boot.diagnostics.FailureAnalysis;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for {@link RedisUrlSyntaxFailureAnalyzer}.
+ *
+ * @author Scott Frederick
+ */
+class RedisUrlSyntaxFailureAnalyzerTests {
+
+	@Test
+	void analyzeInvalidUrlSyntax() {
+		RedisUrlSyntaxException exception = new RedisUrlSyntaxException("redis://invalid");
+		FailureAnalysis analysis = new RedisUrlSyntaxFailureAnalyzer().analyze(exception);
+		assertThat(analysis.getDescription()).contains("The URL 'redis://invalid' is not valid");
+		assertThat(analysis.getAction()).contains("Review the value of the property 'spring.redis.url'");
+	}
+
+	@Test
+	void analyzeRedisHttpUrl() {
+		RedisUrlSyntaxException exception = new RedisUrlSyntaxException("http://127.0.0.1:26379/mymaster");
+		FailureAnalysis analysis = new RedisUrlSyntaxFailureAnalyzer().analyze(exception);
+		assertThat(analysis.getDescription()).contains("The URL 'http://127.0.0.1:26379/mymaster' is not valid")
+				.contains("The scheme 'http' is not supported");
+		assertThat(analysis.getAction()).contains("Use the scheme 'redis://` for insecure or `rediss://` for secure");
+	}
+
+	@Test
+	void analyzeRedisSentinelUrl() {
+		RedisUrlSyntaxException exception = new RedisUrlSyntaxException(
+				"redis-sentinel://username:password@127.0.0.1:26379,127.0.0.1:26380/mymaster");
+		FailureAnalysis analysis = new RedisUrlSyntaxFailureAnalyzer().analyze(exception);
+		assertThat(analysis.getDescription()).contains(
+				"The URL 'redis-sentinel://username:password@127.0.0.1:26379,127.0.0.1:26380/mymaster' is not valid")
+				.contains("The scheme 'redis-sentinel' is not supported");
+		assertThat(analysis.getAction()).contains("Use spring.redis.sentinel properties");
+	}
+
+	@Test
+	void analyzeRedisSocketUrl() {
+		RedisUrlSyntaxException exception = new RedisUrlSyntaxException("redis-socket:///redis/redis.sock");
+		FailureAnalysis analysis = new RedisUrlSyntaxFailureAnalyzer().analyze(exception);
+		assertThat(analysis.getDescription()).contains("The URL 'redis-socket:///redis/redis.sock' is not valid")
+				.contains("The scheme 'redis-socket' is not supported");
+		assertThat(analysis.getAction()).contains("Configure the appropriate Spring Data Redis connection beans");
+	}
+
+}