Allow overriding SecretBackendMetadataFactory beans.

We now allow overriding SecretBackendMetadataFactory by application-provided configuration to customize behavior of integrated secret backends.

Closes gh-118.

spring-cloud-vault-config-databases/src/main/java/org/springframework/cloud/vault/config/databases/VaultConfigDatabaseBootstrapConfiguration.java

@@ -18,6 +18,7 @@ package org.springframework.cloud.vault.config.databases;
 import java.util.HashMap;
 import java.util.Map;
 
+import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
 import org.springframework.cloud.vault.config.PropertyNameTransformer;
 import org.springframework.cloud.vault.config.SecretBackendMetadata;
@@ -41,11 +42,16 @@ import org.springframework.vault.core.util.PropertyTransformer;
 public class VaultConfigDatabaseBootstrapConfiguration {
 
 	@Bean
-	public SecretBackendMetadataFactory<DatabaseSecretProperties> databaseSecretBackendMetadataFactory() {
+	@ConditionalOnMissingBean
+	public DatabaseSecretBackendMetadataFactory databaseSecretBackendMetadataFactory() {
 		return new DatabaseSecretBackendMetadataFactory();
 	}
 
-	static class DatabaseSecretBackendMetadataFactory
+	/**
+	 * {@link SecretBackendMetadataFactory} for Database integration using
+	 * {@link DatabaseSecretProperties}.
+	 */
+	public static class DatabaseSecretBackendMetadataFactory
 			implements SecretBackendMetadataFactory<DatabaseSecretProperties> {
 
 		@Override
@@ -69,7 +75,7 @@ public class VaultConfigDatabaseBootstrapConfiguration {
 		 * @param properties must not be {@literal null}.
 		 * @return the {@link SecretBackendMetadata}
 		 */
-		public static SecretBackendMetadata forDatabase(
+		static SecretBackendMetadata forDatabase(
 				final DatabaseSecretProperties properties) {
 
 			Assert.notNull(properties, "DatabaseSecretProperties must not be null");

spring-cloud-vault-config-databases/src/test/java/org/springframework/cloud/vault/config/databases/VaultConfigDatabaseBootstrapConfigurationTests.java

@@ -0,0 +1,79 @@
+/*
+ * Copyright 2017 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
+ *
+ *      http://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.vault.config.databases;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.cloud.vault.config.GenericSecretBackendMetadata;
+import org.springframework.cloud.vault.config.SecretBackendMetadata;
+import org.springframework.cloud.vault.config.databases.VaultConfigDatabaseBootstrapConfiguration.DatabaseSecretBackendMetadataFactory;
+import org.springframework.cloud.vault.config.databases.VaultConfigDatabaseBootstrapConfigurationTests.CustomBootstrapConfiguration;
+import org.springframework.cloud.vault.util.IntegrationTestSupport;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for {@link VaultConfigDatabaseBootstrapConfiguration}.
+ *
+ * @author Mark Paluch
+ */
+@RunWith(SpringJUnit4ClassRunner.class)
+@SpringBootTest(classes = CustomBootstrapConfiguration.class, properties = {
+		"VaultConfigDatabaseBootstrapConfigurationTests.custom.config=true",
+		"spring.cloud.vault.mysql.role=foo", "spring.cloud.vault.mysql.enabled=true" })
+public class VaultConfigDatabaseBootstrapConfigurationTests
+		extends IntegrationTestSupport {
+
+	@Autowired
+	DatabaseSecretBackendMetadataFactory factory;
+
+	@Autowired
+	VaultMySqlProperties properties;
+
+	@Test
+	public void shouldApplyCustomConfiguration() {
+
+		SecretBackendMetadata metadata = factory.createMetadata(properties);
+
+		assertThat(metadata).isInstanceOf(GenericSecretBackendMetadata.class);
+		assertThat(metadata.getPath()).isEqualTo(properties.getRole());
+	}
+
+	@Configuration
+	public static class CustomBootstrapConfiguration {
+
+		@Bean
+		@ConditionalOnProperty("VaultConfigDatabaseBootstrapConfigurationTests.custom.config")
+		DatabaseSecretBackendMetadataFactory customFactory() {
+
+			return new DatabaseSecretBackendMetadataFactory() {
+				@Override
+				public SecretBackendMetadata createMetadata(
+						DatabaseSecretProperties backendDescriptor) {
+					return GenericSecretBackendMetadata
+							.create(backendDescriptor.getRole());
+				}
+			};
+		}
+	}
+}

spring-cloud-vault-config-databases/src/test/resources/META-INF/spring.factories

@@ -0,0 +1,4 @@
+# Bootstrap Configuration
+org.springframework.cloud.bootstrap.BootstrapConfiguration=\
+org.springframework.cloud.vault.config.databases.VaultConfigDatabaseBootstrapConfigurationTests.CustomBootstrapConfiguration,\
+org.springframework.cloud.vault.config.databases.VaultConfigDatabaseBootstrapConfiguration