#281 - Add support for auditing.

We now provide auditing support that can be enabled through EnableR2dbcAuditing.

@configuration
@EnableR2dbcAuditing
class Config {

  @bean
  public ReactiveAuditorAware<String> myAuditorProvider() {
      return new AuditorAwareImpl();
  }
}

Author: mp911de

Diff for: src/main/asciidoc/index.adoc

@@ -8,7 +8,7 @@ ifdef::backend-epub3[:front-cover-image: image:epub-cover.png[Front Cover,1050,1
 :spring-framework-ref: https://docs.spring.io/spring/docs/{springVersion}/spring-framework-reference
 :reactiveStreamsJavadoc: https://www.reactive-streams.org/reactive-streams-{reactiveStreamsVersion}-javadoc
 
-(C) 2018-2019 The original authors.
+(C) 2018-2020 The original authors.
 
 NOTE: Copies of this document may be made for your own use and for distribution to others, provided that you do not charge any fee for such copies and further provided that each copy contains this Copyright Notice, whether distributed in print or electronically.
 
@@ -34,6 +34,10 @@ include::reference/r2dbc.adoc[leveloffset=+1]
 
 include::reference/r2dbc-repositories.adoc[leveloffset=+1]
 
+include::{spring-data-commons-docs}/auditing.adoc[leveloffset=+1]
+
+include::reference/r2dbc-auditing.adoc[leveloffset=+1]
+
 include::reference/r2dbc-connections.adoc[leveloffset=+1]
 
 include::reference/r2dbc-initialization.adoc[leveloffset=+1]

Diff for: src/main/asciidoc/new-features.adoc

@@ -5,6 +5,7 @@
 == What's New in Spring Data R2DBC 1.2.0
 
 * Support for <<entity-callbacks>>.
+* <<r2dbc.auditing,Auditing>> through `@EnableR2dbcAuditing`.
 
 [[new-features.1-1-0]]
 == What's New in Spring Data R2DBC 1.1.0

Diff for: src/main/asciidoc/reference/r2dbc-auditing.adoc

@@ -0,0 +1,23 @@
+[[r2dbc.auditing]]
+== General Auditing Configuration for R2DBC
+
+Since Spring Data R2DBC 1.2, auditing can be enabled by annotating a configuration class with the `@EnableR2dbcAuditing` annotation, as the following example shows:
+
+.Activating auditing using JavaConfig
+====
+[source,java]
+----
+@Configuration
+@EnableR2dbcAuditing
+class Config {
+
+  @Bean
+  public ReactiveAuditorAware<AuditableUser> myAuditorProvider() {
+      return new AuditorAwareImpl();
+  }
+}
+----
+====
+
+If you expose a bean of type `ReactiveAuditorAware` to the `ApplicationContext`, the auditing infrastructure picks it up automatically and uses it to determine the current user to be set on domain types.
+If you have multiple implementations registered in the `ApplicationContext`, you can select the one to be used by explicitly setting the `auditorAwareRef` attribute of `@EnableR2dbcAuditing`.

Diff for: src/main/asciidoc/reference/r2dbc-entity-callbacks.adoc

@@ -1,7 +1,7 @@
 [[r2dbc.entity-callbacks]]
 = Store specific EntityCallbacks
 
-Spring Data R2DBC uses the `EntityCallback` API and reacts on the following callbacks.
+Spring Data R2DBC uses the `EntityCallback` API for its auditing support and reacts on the following callbacks.
 
 .Supported Entity Callbacks
 [%header,cols="4"]
@@ -22,6 +22,11 @@ Spring Data R2DBC uses the `EntityCallback` API and reacts on the following call
 Can modify the domain object after reading it from a row.
 | `Ordered.LOWEST_PRECEDENCE`
 
+| AuditingEntityCallback
+| `onBeforeConvert(T entity, SqlIdentifier table)`
+| Marks an auditable entity _created_ or _modified_
+| 100
+
 | BeforeSaveCallback
 | `onBeforeSave(T entity, OutboundRow row, SqlIdentifier table)`
 | Invoked before a domain object is saved. +

Diff for: src/main/java/org/springframework/data/r2dbc/config/EnableR2dbcAuditing.java

@@ -0,0 +1,70 @@
+/*
+ * Copyright 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.data.r2dbc.config;
+
+import java.lang.annotation.Documented;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Inherited;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+import org.springframework.context.annotation.Import;
+import org.springframework.data.auditing.DateTimeProvider;
+import org.springframework.data.domain.ReactiveAuditorAware;
+
+/**
+ * Annotation to enable auditing in R2DBC via annotation configuration.
+ *
+ * @author Mark Paluch
+ * @since 1.2
+ */
+@Inherited
+@Documented
+@Target(ElementType.TYPE)
+@Retention(RetentionPolicy.RUNTIME)
+@Import(R2dbcAuditingRegistrar.class)
+public @interface EnableR2dbcAuditing {
+
+	/**
+	 * Configures the {@link ReactiveAuditorAware} bean to be used to lookup the current principal.
+	 *
+	 * @return empty {@link String} by default.
+	 */
+	String auditorAwareRef() default "";
+
+	/**
+	 * Configures whether the creation and modification dates are set. Defaults to {@literal true}.
+	 *
+	 * @return {@literal true} by default.
+	 */
+	boolean setDates() default true;
+
+	/**
+	 * Configures whether the entity shall be marked as modified on creation. Defaults to {@literal true}.
+	 *
+	 * @return {@literal true} by default.
+	 */
+	boolean modifyOnCreate() default true;
+
+	/**
+	 * Configures a {@link DateTimeProvider} bean name that allows customizing the timestamp to be used for setting
+	 * creation and modification dates.
+	 *
+	 * @return empty {@link String} by default.
+	 */
+	String dateTimeProviderRef() default "";
+}

Diff for: src/main/java/org/springframework/data/r2dbc/config/PersistentEntitiesFactoryBean.java

@@ -0,0 +1,59 @@
+/*
+ * Copyright 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.data.r2dbc.config;
+
+import org.springframework.beans.factory.FactoryBean;
+import org.springframework.data.mapping.context.PersistentEntities;
+import org.springframework.data.r2dbc.mapping.R2dbcMappingContext;
+
+/**
+ * Simple helper to be able to wire the {@link PersistentEntities} from a {@link R2dbcMappingContext} bean available in
+ * the application context.
+ *
+ * @author Mark Paluch
+ * @since 1.2
+ */
+class PersistentEntitiesFactoryBean implements FactoryBean<PersistentEntities> {
+
+	private final R2dbcMappingContext mappingContext;
+
+	/**
+	 * Creates a new {@link PersistentEntitiesFactoryBean} for the given {@link R2dbcMappingContext}.
+	 *
+	 * @param converter must not be {@literal null}.
+	 */
+	public PersistentEntitiesFactoryBean(R2dbcMappingContext mappingContext) {
+		this.mappingContext = mappingContext;
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * @see org.springframework.beans.factory.FactoryBean#getObject()
+	 */
+	@Override
+	public PersistentEntities getObject() {
+		return PersistentEntities.of(mappingContext);
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * @see org.springframework.beans.factory.FactoryBean#getObjectType()
+	 */
+	@Override
+	public Class<?> getObjectType() {
+		return PersistentEntities.class;
+	}
+}

Diff for: src/main/java/org/springframework/data/r2dbc/config/R2dbcAuditingRegistrar.java

@@ -0,0 +1,96 @@
+/*
+ * Copyright 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.data.r2dbc.config;
+
+import java.lang.annotation.Annotation;
+
+import org.springframework.beans.factory.config.BeanDefinition;
+import org.springframework.beans.factory.support.AbstractBeanDefinition;
+import org.springframework.beans.factory.support.BeanDefinitionBuilder;
+import org.springframework.beans.factory.support.BeanDefinitionRegistry;
+import org.springframework.context.annotation.ImportBeanDefinitionRegistrar;
+import org.springframework.data.auditing.ReactiveIsNewAwareAuditingHandler;
+import org.springframework.data.auditing.config.AuditingBeanDefinitionRegistrarSupport;
+import org.springframework.data.auditing.config.AuditingConfiguration;
+import org.springframework.data.config.ParsingUtils;
+import org.springframework.data.r2dbc.mapping.event.ReactiveAuditingEntityCallback;
+import org.springframework.util.Assert;
+
+/**
+ * {@link ImportBeanDefinitionRegistrar} to enable {@link EnableR2dbcAuditing} annotation.
+ *
+ * @author Mark Paluch
+ * @since 1.2
+ */
+class R2dbcAuditingRegistrar extends AuditingBeanDefinitionRegistrarSupport {
+
+	/*
+	 * (non-Javadoc)
+	 * @see org.springframework.data.auditing.config.AuditingBeanDefinitionRegistrarSupport#getAnnotation()
+	 */
+	@Override
+	protected Class<? extends Annotation> getAnnotation() {
+		return EnableR2dbcAuditing.class;
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * @see org.springframework.data.auditing.config.AuditingBeanDefinitionRegistrarSupport#getAuditingHandlerBeanName()
+	 */
+	@Override
+	protected String getAuditingHandlerBeanName() {
+		return "r2dbcAuditingHandler";
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * @see org.springframework.data.auditing.config.AuditingBeanDefinitionRegistrarSupport#getAuditHandlerBeanDefinitionBuilder(org.springframework.data.auditing.config.AuditingConfiguration)
+	 */
+	@Override
+	protected BeanDefinitionBuilder getAuditHandlerBeanDefinitionBuilder(AuditingConfiguration configuration) {
+
+		Assert.notNull(configuration, "AuditingConfiguration must not be null!");
+
+		BeanDefinitionBuilder builder = BeanDefinitionBuilder.rootBeanDefinition(ReactiveIsNewAwareAuditingHandler.class);
+
+		BeanDefinitionBuilder definition = BeanDefinitionBuilder.genericBeanDefinition(PersistentEntitiesFactoryBean.class);
+		definition.setAutowireMode(AbstractBeanDefinition.AUTOWIRE_CONSTRUCTOR);
+
+		builder.addConstructorArgValue(definition.getBeanDefinition());
+		return configureDefaultAuditHandlerAttributes(configuration, builder);
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * @see org.springframework.data.auditing.config.AuditingBeanDefinitionRegistrarSupport#registerAuditListener(org.springframework.beans.factory.config.BeanDefinition, org.springframework.beans.factory.support.BeanDefinitionRegistry)
+	 */
+	@Override
+	protected void registerAuditListenerBeanDefinition(BeanDefinition auditingHandlerDefinition,
+			BeanDefinitionRegistry registry) {
+
+		Assert.notNull(auditingHandlerDefinition, "BeanDefinition must not be null!");
+		Assert.notNull(registry, "BeanDefinitionRegistry must not be null!");
+
+		BeanDefinitionBuilder builder = BeanDefinitionBuilder.rootBeanDefinition(ReactiveAuditingEntityCallback.class);
+
+		builder.addConstructorArgValue(ParsingUtils.getObjectFactoryBeanDefinition(getAuditingHandlerBeanName(), registry));
+		builder.getRawBeanDefinition().setSource(auditingHandlerDefinition.getSource());
+
+		registerInfrastructureBeanWithId(builder.getBeanDefinition(), ReactiveAuditingEntityCallback.class.getName(),
+				registry);
+	}
+
+}

Diff for: src/main/java/org/springframework/data/r2dbc/mapping/event/ReactiveAuditingEntityCallback.java

@@ -0,0 +1,68 @@
+/*
+ * Copyright 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.data.r2dbc.mapping.event;
+
+import org.reactivestreams.Publisher;
+
+import org.springframework.beans.factory.ObjectFactory;
+import org.springframework.core.Ordered;
+import org.springframework.data.auditing.AuditingHandler;
+import org.springframework.data.auditing.ReactiveIsNewAwareAuditingHandler;
+import org.springframework.data.mapping.callback.EntityCallback;
+import org.springframework.data.mapping.context.MappingContext;
+import org.springframework.data.relational.core.sql.SqlIdentifier;
+import org.springframework.util.Assert;
+
+/**
+ * Reactive {@link EntityCallback} to populate auditing related fields on an entity about to be saved.
+ *
+ * @author Mark Paluch
+ * @since 1.2
+ */
+public class ReactiveAuditingEntityCallback implements BeforeConvertCallback<Object>, Ordered {
+
+	private final ObjectFactory<ReactiveIsNewAwareAuditingHandler> auditingHandlerFactory;
+
+	/**
+	 * Creates a new {@link BeforeConvertCallback} using the given {@link MappingContext} and {@link AuditingHandler}
+	 * provided by the given {@link ObjectFactory}.
+	 *
+	 * @param auditingHandlerFactory must not be {@literal null}.
+	 */
+	public ReactiveAuditingEntityCallback(ObjectFactory<ReactiveIsNewAwareAuditingHandler> auditingHandlerFactory) {
+
+		Assert.notNull(auditingHandlerFactory, "IsNewAwareAuditingHandler must not be null!");
+		this.auditingHandlerFactory = auditingHandlerFactory;
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * @see org.springframework.data.r2dbc.mapping.event.ReactiveBeforeConvertCallback#onBeforeConvert(java.lang.Object, SqlIdentifier)
+	 */
+	@Override
+	public Publisher<Object> onBeforeConvert(Object entity, SqlIdentifier table) {
+		return auditingHandlerFactory.getObject().markAudited(entity);
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * @see org.springframework.core.Ordered#getOrder()
+	 */
+	@Override
+	public int getOrder() {
+		return 100;
+	}
+}