Rework Antora Gradle Infrastructure

Closes gh-40572

Co-authored-by: Phillip Webb <phil.webb@broadcom.com>

buildSrc/build.gradle

@@ -70,6 +70,14 @@ gradlePlugin {
 			id = "org.springframework.boot.annotation-processor"
 			implementationClass = "org.springframework.boot.build.processors.AnnotationProcessorPlugin"
 		}
+		antoraAggregatedPlugin {
+			id = "org.springframework.boot.antora-contributor"
+			implementationClass = "org.springframework.boot.build.antora.AntoraContributorPlugin"
+		}
+		antoraAggregatorPlugin {
+			id = "org.springframework.boot.antora-dependencies"
+			implementationClass = "org.springframework.boot.build.antora.AntoraDependenciesPlugin"
+		}
 		architecturePlugin {
 			id = "org.springframework.boot.architecture"
 			implementationClass = "org.springframework.boot.build.architecture.ArchitecturePlugin"

buildSrc/src/main/java/org/springframework/boot/build/AntoraConventions.java

@@ -58,10 +58,18 @@ public class AntoraConventions {
 
 	private static final String DEPENDENCIES_PATH = ":spring-boot-project:spring-boot-dependencies";
 
-	private static final String ANTORA_SOURCE_DIR = "src/docs/antora";
-
 	private static final List<String> NAV_FILES = List.of("nav.adoc", "local-nav.adoc");
 
+	/**
+	 * Default Antora source directory.
+	 */
+	public static final String ANTORA_SOURCE_DIR = "src/docs/antora";
+
+	/**
+	 * Name of the {@link GenerateAntoraPlaybook} task.
+	 */
+	public static final String GENERATE_ANTORA_PLAYBOOK_TASK_NAME = "generateAntoraPlaybook";
+
 	void apply(Project project) {
 		project.getPlugins().withType(AntoraPlugin.class, (antoraPlugin) -> apply(project, antoraPlugin));
 	}
@@ -70,7 +78,7 @@ public class AntoraConventions {
 		ExtractVersionConstraints dependencyVersionsTask = addDependencyVersionsTask(project);
 		project.getPlugins().apply(GenerateAntoraYmlPlugin.class);
 		TaskContainer tasks = project.getTasks();
-		GenerateAntoraPlaybook generateAntoraPlaybookTask = tasks.create("generateAntoraPlaybook",
+		GenerateAntoraPlaybook generateAntoraPlaybookTask = tasks.create(GENERATE_ANTORA_PLAYBOOK_TASK_NAME,
 				GenerateAntoraPlaybook.class);
 		configureGenerateAntoraPlaybookTask(project, generateAntoraPlaybookTask);
 		Copy copyAntoraPackageJsonTask = tasks.create("copyAntoraPackageJson", Copy.class);

buildSrc/src/main/java/org/springframework/boot/build/antora/AggregateContentContribution.java

@@ -0,0 +1,32 @@
+/*
+ * Copyright 2012-2024 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.build.antora;
+
+import org.gradle.api.Project;
+
+/**
+ * A contribution of aggregate content.
+ *
+ * @author Andy Wilkinson
+ */
+class AggregateContentContribution extends ConsumableContentContribution {
+
+	protected AggregateContentContribution(Project project, String name) {
+		super(project, "aggregate", name);
+	}
+
+}

buildSrc/src/main/java/org/springframework/boot/build/antora/AntoraContributorPlugin.java

@@ -0,0 +1,85 @@
+/*
+ * Copyright 2012-2024 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.build.antora;
+
+import javax.inject.Inject;
+
+import org.antora.gradle.AntoraPlugin;
+import org.gradle.api.Action;
+import org.gradle.api.NamedDomainObjectContainer;
+import org.gradle.api.Plugin;
+import org.gradle.api.Project;
+import org.gradle.api.file.CopySpec;
+
+/**
+ * {@link Plugin} for a project that contributes to Antora-based documentation that is
+ * {@link AntoraDependenciesPlugin depended upon} by another project.
+ *
+ * @author Andy Wilkinson
+ */
+public class AntoraContributorPlugin implements Plugin<Project> {
+
+	@Override
+	public void apply(Project project) {
+		project.getPlugins().apply(AntoraPlugin.class);
+		NamedDomainObjectContainer<Contribution> antoraContributions = project.getObjects()
+			.domainObjectContainer(Contribution.class,
+					(name) -> project.getObjects().newInstance(Contribution.class, name, project));
+		project.getExtensions().add("antoraContributions", antoraContributions);
+	}
+
+	public static class Contribution {
+
+		private final String name;
+
+		private final Project project;
+
+		@Inject
+		public Contribution(String name, Project project) {
+			this.name = name;
+			this.project = project;
+		}
+
+		public String getName() {
+			return this.name;
+		}
+
+		public void source() {
+			new SourceContribution(this.project, this.name).produce();
+		}
+
+		public void catalogContent(Action<CopySpec> action) {
+			CopySpec copySpec = this.project.copySpec();
+			action.execute(copySpec);
+			new CatalogContentContribution(this.project, this.name).produceFrom(copySpec);
+		}
+
+		public void aggregateContent(Action<CopySpec> action) {
+			CopySpec copySpec = this.project.copySpec();
+			action.execute(copySpec);
+			new AggregateContentContribution(this.project, this.name).produceFrom(copySpec);
+		}
+
+		public void localAggregateContent(Action<CopySpec> action) {
+			CopySpec copySpec = this.project.copySpec();
+			action.execute(copySpec);
+			new LocalAggregateContentContribution(this.project, this.name).produceFrom(copySpec);
+		}
+
+	}
+
+}

buildSrc/src/main/java/org/springframework/boot/build/antora/AntoraDependenciesPlugin.java

@@ -0,0 +1,80 @@
+/*
+ * Copyright 2012-2024 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.build.antora;
+
+import javax.inject.Inject;
+
+import org.gradle.api.NamedDomainObjectContainer;
+import org.gradle.api.Plugin;
+import org.gradle.api.Project;
+
+/**
+ * {@link Plugin} for a project that depends on {@link AntoraContributorPlugin
+ * contributed} Antora-based documentation.
+ *
+ * @author Andy Wilkinson
+ */
+public class AntoraDependenciesPlugin implements Plugin<Project> {
+
+	@Override
+	public void apply(Project project) {
+		NamedDomainObjectContainer<AntoraDependency> antoraDependencies = project.getObjects()
+			.domainObjectContainer(AntoraDependency.class);
+		project.getExtensions().add("antoraDependencies", antoraDependencies);
+	}
+
+	public static class AntoraDependency {
+
+		private final String name;
+
+		private final Project project;
+
+		private String path;
+
+		@Inject
+		public AntoraDependency(String name, Project project) {
+			this.name = name;
+			this.project = project;
+		}
+
+		public String getName() {
+			return this.name;
+		}
+
+		public String getPath() {
+			return this.path;
+		}
+
+		public void setPath(String path) {
+			this.path = path;
+		}
+
+		public void catalogContent() {
+			new CatalogContentContribution(this.project, this.name).consumeFrom(this.path);
+		}
+
+		public void aggregateContent() {
+			new AggregateContentContribution(this.project, this.name).consumeFrom(this.path);
+		}
+
+		public void source() {
+			new SourceContribution(this.project, this.name).consumeFrom(this.path);
+		}
+
+	}
+
+}

buildSrc/src/main/java/org/springframework/boot/build/antora/CatalogContentContribution.java

@@ -0,0 +1,32 @@
+/*
+ * Copyright 2012-2024 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.build.antora;
+
+import org.gradle.api.Project;
+
+/**
+ * A contribution of catalog content.
+ *
+ * @author Andy Wilkinson
+ */
+class CatalogContentContribution extends ConsumableContentContribution {
+
+	CatalogContentContribution(Project project, String name) {
+		super(project, "catalog", name);
+	}
+
+}

buildSrc/src/main/java/org/springframework/boot/build/antora/ConsumableContentContribution.java

@@ -0,0 +1,107 @@
+/*
+ * Copyright 2012-2024 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.build.antora;
+
+import org.gradle.api.Project;
+import org.gradle.api.Task;
+import org.gradle.api.artifacts.Configuration;
+import org.gradle.api.artifacts.dsl.DependencyHandler;
+import org.gradle.api.file.CopySpec;
+import org.gradle.api.file.Directory;
+import org.gradle.api.file.RegularFile;
+import org.gradle.api.provider.Provider;
+import org.gradle.api.publish.PublishingExtension;
+import org.gradle.api.publish.maven.MavenPublication;
+import org.gradle.api.tasks.TaskContainer;
+import org.gradle.api.tasks.TaskProvider;
+
+/**
+ * A contribution of content to Antora that can be consumed by other projects.
+ *
+ * @author Andy Wilkinson
+ */
+class ConsumableContentContribution extends ContentContribution {
+
+	protected ConsumableContentContribution(Project project, String type, String name) {
+		super(project, name, type);
+	}
+
+	@Override
+	void produceFrom(CopySpec copySpec) {
+		TaskProvider<? extends Task> producer = super.configureProduction(copySpec);
+		Configuration configuration = createConfiguration(getName(),
+				"Configuration for %s Antora %s content artifacts.");
+		configuration.setCanBeConsumed(true);
+		configuration.setCanBeResolved(false);
+		getProject().getArtifacts().add(configuration.getName(), producer);
+	}
+
+	void consumeFrom(String path) {
+		Configuration configuration = createConfiguration(getName(), "Configuration for %s Antora %s content.");
+		configuration.setCanBeConsumed(false);
+		configuration.setCanBeResolved(true);
+		DependencyHandler dependencies = getProject().getDependencies();
+		dependencies.add(configuration.getName(),
+				getProject().provider(() -> projectDependency(path, configuration.getName())));
+		Provider<Directory> outputDirectory = outputDirectory("content", getName());
+		TaskContainer tasks = getProject().getTasks();
+		TaskProvider<?> copyAntoraContent = tasks.register(taskName("copy", "%s", configuration.getName()),
+				CopyAntoraContent.class, (task) -> configureCopyContent(task, path, configuration, outputDirectory));
+		configureAntora(addInputFrom(copyAntoraContent, configuration.getName()));
+		configurePlaybookGeneration(this::addToZipContentsCollectorDependencies);
+		getProject().getExtensions()
+			.getByType(PublishingExtension.class)
+			.getPublications()
+			.withType(MavenPublication.class)
+			.configureEach((mavenPublication) -> addPublishedMavenArtifact(mavenPublication, copyAntoraContent));
+	}
+
+	private void configureCopyContent(CopyAntoraContent task, String path, Configuration configuration,
+			Provider<Directory> outputDirectory) {
+		task.setDescription(
+				"Syncs the %s Antora %s content from %s.".formatted(getName(), toDescription(getType()), path));
+		task.setSource(configuration);
+		task.getOutputFile().set(outputDirectory.map(this::getContentZipFile));
+	}
+
+	private void addToZipContentsCollectorDependencies(GenerateAntoraPlaybook task) {
+		task.getAntoraExtensions().getZipContentsCollector().getDependencies().add(getName());
+	}
+
+	private void addPublishedMavenArtifact(MavenPublication mavenPublication, TaskProvider<?> copyAntoraContent) {
+		if ("maven".equals(mavenPublication.getName())) {
+			String classifier = "%s-%s-content".formatted(getName(), getType());
+			mavenPublication.artifact(copyAntoraContent, (mavenArtifact) -> mavenArtifact.setClassifier(classifier));
+		}
+	}
+
+	private RegularFile getContentZipFile(Directory dir) {
+		Object version = getProject().getVersion();
+		return dir.file("spring-boot-docs-%s-%s-%s-content.zip".formatted(version, getName(), getType()));
+	}
+
+	private static String toDescription(String input) {
+		return input.replace("-", " ");
+	}
+
+	private Configuration createConfiguration(String name, String description) {
+		return getProject().getConfigurations()
+			.create(configurationName(name, "Antora%sContent", getType()),
+					(configuration) -> configuration.setDescription(description.formatted(getName(), getType())));
+	}
+
+}

buildSrc/src/main/java/org/springframework/boot/build/antora/ContentContribution.java

@@ -0,0 +1,65 @@
+/*
+ * Copyright 2012-2024 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.build.antora;
+
+import org.gradle.api.Project;
+import org.gradle.api.Task;
+import org.gradle.api.file.CopySpec;
+import org.gradle.api.tasks.TaskContainer;
+import org.gradle.api.tasks.TaskProvider;
+import org.gradle.api.tasks.bundling.Zip;
+
+/**
+ * A contribution of content to Antora.
+ *
+ * @author Andy Wilkinson
+ */
+abstract class ContentContribution extends Contribution {
+
+	private final String type;
+
+	protected ContentContribution(Project project, String name, String type) {
+		super(project, name);
+		this.type = type;
+	}
+
+	protected String getType() {
+		return this.type;
+	}
+
+	abstract void produceFrom(CopySpec copySpec);
+
+	protected TaskProvider<? extends Task> configureProduction(CopySpec copySpec) {
+		TaskContainer tasks = getProject().getTasks();
+		TaskProvider<Zip> zipContent = tasks.register(taskName("zip", "%sAntora%sContent", getName(), this.type),
+				Zip.class, (zip) -> {
+					zip.getDestinationDirectory()
+						.set(getProject().getLayout().getBuildDirectory().dir("generated/docs/antora-content"));
+					zip.getArchiveClassifier().set("%s-%s-content".formatted(getName(), this.type));
+					zip.with(copySpec);
+					zip.setDescription("Creates a zip archive of the %s Antora %s content.".formatted(getName(),
+							toDescription(this.type)));
+				});
+		configureAntora(addInputFrom(zipContent, zipContent.getName()));
+		return zipContent;
+	}
+
+	private static String toDescription(String input) {
+		return input.replace("-", " ");
+	}
+
+}

buildSrc/src/main/java/org/springframework/boot/build/antora/Contribution.java

@@ -0,0 +1,115 @@
+/*
+ * Copyright 2012-2024 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.build.antora;
+
+import java.util.Arrays;
+import java.util.Map;
+
+import org.antora.gradle.AntoraTask;
+import org.apache.commons.lang3.StringUtils;
+import org.gradle.api.Action;
+import org.gradle.api.Project;
+import org.gradle.api.artifacts.Dependency;
+import org.gradle.api.file.Directory;
+import org.gradle.api.provider.Provider;
+import org.gradle.api.tasks.PathSensitivity;
+import org.gradle.api.tasks.TaskProvider;
+
+import org.springframework.boot.build.AntoraConventions;
+
+/**
+ * A contribution to Antora.
+ *
+ * @author Andy Wilkinson
+ */
+abstract class Contribution {
+
+	private final Project project;
+
+	private final String name;
+
+	protected Contribution(Project project, String name) {
+		this.project = project;
+		this.name = name;
+	}
+
+	protected Project getProject() {
+		return this.project;
+	}
+
+	protected String getName() {
+		return this.name;
+	}
+
+	protected Dependency projectDependency(String path, String configurationName) {
+		return getProject().getDependencies().project(Map.of("path", path, "configuration", configurationName));
+	}
+
+	protected Provider<Directory> outputDirectory(String dependencyType, String theName) {
+		return getProject().getLayout()
+			.getBuildDirectory()
+			.dir("generated/docs/antora-dependencies-" + dependencyType + "/" + theName);
+	}
+
+	protected String taskName(String verb, String object, String... args) {
+		return name(verb, object, args);
+	}
+
+	protected String configurationName(String name, String type, String... args) {
+		return name(toCamelCase(name), type, args);
+	}
+
+	protected void configurePlaybookGeneration(Action<GenerateAntoraPlaybook> action) {
+		this.project.getTasks()
+			.named(AntoraConventions.GENERATE_ANTORA_PLAYBOOK_TASK_NAME, GenerateAntoraPlaybook.class, action);
+	}
+
+	protected void configureAntora(Action<AntoraTask> action) {
+		this.project.getTasks().named("antora", AntoraTask.class, action);
+	}
+
+	protected Action<AntoraTask> addInputFrom(TaskProvider<?> task, String propertyName) {
+		return (antora) -> antora.getInputs()
+			.files(task)
+			.withPathSensitivity(PathSensitivity.RELATIVE)
+			.withPropertyName(propertyName);
+	}
+
+	private String name(String prefix, String format, String... args) {
+		return prefix + format.formatted(Arrays.stream(args).map(this::toPascalCase).toArray());
+	}
+
+	private String toPascalCase(String input) {
+		return StringUtils.capitalize(toCamelCase(input));
+	}
+
+	private String toCamelCase(String input) {
+		StringBuilder output = new StringBuilder(input.length());
+		boolean capitalize = false;
+		for (char c : input.toCharArray()) {
+			if (c == '-') {
+				capitalize = true;
+			}
+			else {
+				output.append(capitalize ? Character.toUpperCase(c) : c);
+				capitalize = false;
+			}
+		}
+		return output.toString();
+	}
+
+}

buildSrc/src/main/java/org/springframework/boot/build/antora/CopyAntoraContent.java

@@ -0,0 +1,65 @@
+/*
+ * Copyright 2012-2024 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.build.antora;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.StandardCopyOption;
+
+import javax.inject.Inject;
+
+import org.gradle.api.DefaultTask;
+import org.gradle.api.file.FileCollection;
+import org.gradle.api.file.RegularFileProperty;
+import org.gradle.api.tasks.InputFiles;
+import org.gradle.api.tasks.OutputFile;
+import org.gradle.api.tasks.TaskAction;
+
+/**
+ * Tasks to copy Antora content.
+ *
+ * @author Andy Wilkinson
+ */
+public abstract class CopyAntoraContent extends DefaultTask {
+
+	private FileCollection source;
+
+	@Inject
+	public CopyAntoraContent() {
+	}
+
+	@InputFiles
+	public FileCollection getSource() {
+		return this.source;
+	}
+
+	public void setSource(FileCollection source) {
+		this.source = source;
+	}
+
+	@OutputFile
+	public abstract RegularFileProperty getOutputFile();
+
+	@TaskAction
+	void copyAntoraContent() throws IllegalStateException, IOException {
+		Path source = this.source.getSingleFile().toPath();
+		Path target = getOutputFile().getAsFile().get().toPath();
+		Files.copy(source, target, StandardCopyOption.REPLACE_EXISTING);
+	}
+
+}

buildSrc/src/main/java/org/springframework/boot/build/antora/Extensions.java

@@ -16,7 +16,7 @@
 
 package org.springframework.boot.build.antora;
 
-import java.nio.file.Path;
+import java.io.Serializable;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collections;
@@ -158,20 +158,24 @@ public final class Extensions {
 				customize("version_file", versionFile);
 			}
 
-			void locations(Path... locations) {
-				locations(Arrays.stream(locations).map(Path::toString).toList());
-			}
-
-			private void locations(List<String> locations) {
+			void locations(List<String> locations) {
 				customize("locations", locations);
 			}
 
-			void alwaysInclude(Map<String, String> alwaysInclude) {
+			void alwaysInclude(List<AlwaysInclude> alwaysInclude) {
 				if (alwaysInclude != null && !alwaysInclude.isEmpty()) {
-					customize("always_include", List.of(new TreeMap<>(alwaysInclude)));
+					customize("always_include", alwaysInclude.stream().map(AlwaysInclude::asMap).toList());
 				}
 			}
 
+			record AlwaysInclude(String name, String classifier) implements Serializable {
+
+				private Map<String, String> asMap() {
+					return new TreeMap<>(Map.of("name", name(), "classifier", classifier()));
+				}
+
+			}
+
 		}
 
 		class RootComponent extends Customizer {

buildSrc/src/main/java/org/springframework/boot/build/antora/GenerateAntoraPlaybook.java

@@ -26,26 +26,31 @@ import java.nio.file.Path;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.LinkedHashMap;
-import java.util.LinkedHashSet;
 import java.util.List;
 import java.util.Map;
-import java.util.Set;
+
+import javax.inject.Inject;
 
 import org.gradle.api.DefaultTask;
 import org.gradle.api.Project;
-import org.gradle.api.artifacts.Configuration;
-import org.gradle.api.artifacts.ProjectDependency;
+import org.gradle.api.file.Directory;
 import org.gradle.api.file.RegularFileProperty;
+import org.gradle.api.model.ObjectFactory;
 import org.gradle.api.provider.ListProperty;
-import org.gradle.api.provider.MapProperty;
 import org.gradle.api.provider.Property;
+import org.gradle.api.provider.Provider;
+import org.gradle.api.provider.SetProperty;
 import org.gradle.api.tasks.Input;
+import org.gradle.api.tasks.Nested;
 import org.gradle.api.tasks.Optional;
 import org.gradle.api.tasks.OutputFile;
 import org.gradle.api.tasks.TaskAction;
 import org.yaml.snakeyaml.DumperOptions;
 import org.yaml.snakeyaml.Yaml;
 
+import org.springframework.boot.build.AntoraConventions;
+import org.springframework.boot.build.antora.Extensions.AntoraExtensionsConfiguration.ZipContentsCollector.AlwaysInclude;
+
 /**
  * Task to generate a local Antora playbook.
  *
@@ -53,35 +58,61 @@ import org.yaml.snakeyaml.Yaml;
  */
 public abstract class GenerateAntoraPlaybook extends DefaultTask {
 
-	private static final String ANTORA_SOURCE_DIR = "src/docs/antora";
-
 	private static final String GENERATED_DOCS = "build/generated/docs/";
 
-	@OutputFile
-	public abstract RegularFileProperty getOutputFile();
+	private final Path root;
 
-	@Input
-	public abstract Property<String> getContentSourceConfiguration();
+	private final Provider<String> playbookOutputDir;
 
-	@Input
-	@Optional
-	public abstract ListProperty<String> getXrefStubs();
+	private final String version;
 
-	@Input
-	@Optional
-	public abstract MapProperty<String, String> getAlwaysInclude();
+	private final AntoraExtensions antoraExtensions;
 
-	@Input
-	@Optional
-	public abstract Property<Boolean> getExcludeJavadocExtension();
+	private final AsciidocExtensions asciidocExtensions;
+
+	private final ContentSource contentSource;
+
+	@OutputFile
+	public abstract RegularFileProperty getOutputFile();
 
 	public GenerateAntoraPlaybook() {
+		this.root = toRealPath(getProject().getRootDir().toPath());
+		this.antoraExtensions = getProject().getObjects().newInstance(AntoraExtensions.class, this.root);
+		this.asciidocExtensions = getProject().getObjects().newInstance(AsciidocExtensions.class);
+		this.version = getProject().getVersion().toString();
+		this.playbookOutputDir = configurePlaybookOutputDir(getProject());
+		this.contentSource = getProject().getObjects().newInstance(ContentSource.class, this.root);
 		setGroup("Documentation");
 		setDescription("Generates an Antora playbook.yml file for local use");
 		getOutputFile().convention(getProject().getLayout()
 			.getBuildDirectory()
 			.file("generated/docs/antora-playbook/antora-playbook.yml"));
-		getContentSourceConfiguration().convention("antoraContent");
+		this.contentSource.addStartPath(getProject()
+			.provider(() -> getProject().getLayout().getProjectDirectory().dir(AntoraConventions.ANTORA_SOURCE_DIR)));
+	}
+
+	@Nested
+	public AntoraExtensions getAntoraExtensions() {
+		return this.antoraExtensions;
+	}
+
+	@Nested
+	public AsciidocExtensions getAsciidocExtensions() {
+		return this.asciidocExtensions;
+	}
+
+	@Nested
+	public ContentSource getContentSource() {
+		return this.contentSource;
+	}
+
+	private Provider<String> configurePlaybookOutputDir(Project project) {
+		Path siteDirectory = getProject().getLayout().getBuildDirectory().dir("site").get().getAsFile().toPath();
+		return project.provider(() -> {
+			Path playbookDir = toRealPath(getOutputFile().get().getAsFile().toPath()).getParent();
+			Path outputDir = toRealPath(siteDirectory);
+			return "." + File.separator + playbookDir.relativize(outputDir).toString();
+		});
 	}
 
 	@TaskAction
@@ -93,26 +124,14 @@ public abstract class GenerateAntoraPlaybook extends DefaultTask {
 		}
 	}
 
-	@Input
-	final Map<String, Object> getData() throws IOException {
+	private Map<String, Object> getData() throws IOException {
 		Map<String, Object> data = loadPlaybookTemplate();
 		addExtensions(data);
 		addSources(data);
 		addDir(data);
-		filterJavadocExtension(data);
 		return data;
 	}
 
-	@SuppressWarnings("unchecked")
-	private void filterJavadocExtension(Map<String, Object> data) {
-		if (getExcludeJavadocExtension().getOrElse(Boolean.FALSE)) {
-			Map<String, Object> asciidoc = (Map<String, Object>) data.get("asciidoc");
-			List<String> extensions = new ArrayList<>((List<String>) asciidoc.get("extensions"));
-			extensions.remove("@springio/asciidoctor-extensions/javadoc-extension");
-			asciidoc.put("extensions", extensions);
-		}
-	}
-
 	@SuppressWarnings("unchecked")
 	private Map<String, Object> loadPlaybookTemplate() throws IOException {
 		try (InputStream resource = getClass().getResourceAsStream("antora-playbook-template.yml")) {
@@ -124,21 +143,25 @@ public abstract class GenerateAntoraPlaybook extends DefaultTask {
 	private void addExtensions(Map<String, Object> data) {
 		Map<String, Object> antora = (Map<String, Object>) data.get("antora");
 		antora.put("extensions", Extensions.antora((extensions) -> {
-			extensions.xref((xref) -> xref.stub(getXrefStubs().getOrElse(Collections.emptyList())));
+			extensions.xref(
+					(xref) -> xref.stub(this.antoraExtensions.getXref().getStubs().getOrElse(Collections.emptyList())));
 			extensions.zipContentsCollector((zipContentsCollector) -> {
 				zipContentsCollector.versionFile("gradle.properties");
-				String locationName = getProject().getName() + "-${version}-${name}-${classifier}.zip";
-				Path antoraContent = getRelativeProjectPath()
-					.resolve(GENERATED_DOCS + "antora-content/" + locationName);
-				Path antoraDependencies = getRelativeProjectPath()
-					.resolve(GENERATED_DOCS + "antora-dependencies-content/" + locationName);
-				zipContentsCollector.locations(antoraContent, antoraDependencies);
-				zipContentsCollector.alwaysInclude(getAlwaysInclude().getOrNull());
+				zipContentsCollector.locations(this.antoraExtensions.getZipContentsCollector()
+					.getLocations()
+					.getOrElse(Collections.emptyList()));
+				zipContentsCollector
+					.alwaysInclude(this.antoraExtensions.getZipContentsCollector().getAlwaysInclude().getOrNull());
 			});
 			extensions.rootComponent((rootComponent) -> rootComponent.name("boot"));
 		}));
 		Map<String, Object> asciidoc = (Map<String, Object>) data.get("asciidoc");
-		asciidoc.put("extensions", Extensions.asciidoc());
+		List<String> asciidocExtensions = Extensions.asciidoc();
+		if (this.asciidocExtensions.getExcludeJavadocExtension().getOrElse(Boolean.FALSE)) {
+			asciidocExtensions = new ArrayList<>(asciidocExtensions);
+			asciidocExtensions.remove("@springio/asciidoctor-extensions/javadoc-extension");
+		}
+		asciidoc.put("extensions", asciidocExtensions);
 	}
 
 	private void addSources(Map<String, Object> data) {
@@ -149,34 +172,17 @@ public abstract class GenerateAntoraPlaybook extends DefaultTask {
 	private Map<String, Object> createContentSource() {
 		Map<String, Object> source = new LinkedHashMap<>();
 		Path playbookPath = getOutputFile().get().getAsFile().toPath().getParent();
-		Path antoraSrc = getProjectPath(getProject()).resolve(ANTORA_SOURCE_DIR);
 		StringBuilder url = new StringBuilder(".");
-		relativizeFromRootProject(playbookPath).normalize().forEach((path) -> url.append(File.separator).append(".."));
+		this.root.relativize(playbookPath).normalize().forEach((path) -> url.append(File.separator).append(".."));
 		source.put("url", url.toString());
 		source.put("branches", "HEAD");
-		source.put("version", getProject().getVersion().toString());
-		Set<String> startPaths = new LinkedHashSet<>();
-		addAntoraContentStartPaths(startPaths);
-		startPaths.add(relativizeFromRootProject(antoraSrc).toString());
-		source.put("start_paths", startPaths.stream().toList());
+		source.put("version", this.version);
+		source.put("start_paths", this.contentSource.getStartPaths().get());
 		return source;
 	}
 
-	private void addAntoraContentStartPaths(Set<String> startPaths) {
-		Configuration configuration = getProject().getConfigurations().findByName("antoraContent");
-		if (configuration != null) {
-			for (ProjectDependency dependency : configuration.getAllDependencies().withType(ProjectDependency.class)) {
-				Path path = dependency.getDependencyProject().getProjectDir().toPath();
-				startPaths.add(relativizeFromRootProject(path).resolve(ANTORA_SOURCE_DIR).toString());
-			}
-		}
-	}
-
 	private void addDir(Map<String, Object> data) {
-		Path playbookDir = toRealPath(getOutputFile().get().getAsFile().toPath()).getParent();
-		Path outputDir = toRealPath(
-				getProject().getLayout().getBuildDirectory().dir("site").get().getAsFile().toPath());
-		data.put("output", Map.of("dir", "." + File.separator + playbookDir.relativize(outputDir).toString()));
+		data.put("output", Map.of("dir", this.playbookOutputDir.get()));
 	}
 
 	@SuppressWarnings("unchecked")
@@ -201,26 +207,121 @@ public abstract class GenerateAntoraPlaybook extends DefaultTask {
 		return new Yaml(options);
 	}
 
-	private Path getRelativeProjectPath() {
-		return relativizeFromRootProject(getProjectPath(getProject()));
+	private static Path toRealPath(Path path) {
+		try {
+			return Files.exists(path) ? path.toRealPath() : path;
+		}
+		catch (IOException ex) {
+			throw new UncheckedIOException(ex);
+		}
 	}
 
-	private Path relativizeFromRootProject(Path subPath) {
-		Path rootProjectPath = getProjectPath(getProject().getRootProject());
-		return rootProjectPath.relativize(subPath).normalize();
+	public abstract static class AntoraExtensions {
+
+		private final Xref xref;
+
+		private final ZipContentsCollector zipContentsCollector;
+
+		@Inject
+		public AntoraExtensions(ObjectFactory objects, Path root) {
+			this.xref = objects.newInstance(Xref.class);
+			this.zipContentsCollector = objects.newInstance(ZipContentsCollector.class, root);
+		}
+
+		@Nested
+		public Xref getXref() {
+			return this.xref;
+		}
+
+		@Nested
+		public ZipContentsCollector getZipContentsCollector() {
+			return this.zipContentsCollector;
+		}
+
+		public abstract static class Xref {
+
+			@Input
+			@Optional
+			public abstract ListProperty<String> getStubs();
+
+		}
+
+		public abstract static class ZipContentsCollector {
+
+			private final Provider<List<String>> locations;
+
+			@Inject
+			public ZipContentsCollector(Project project, Path root) {
+				this.locations = configureZipContentCollectorLocations(project, root);
+			}
+
+			private Provider<List<String>> configureZipContentCollectorLocations(Project project, Path root) {
+				ListProperty<String> locations = project.getObjects().listProperty(String.class);
+				Path relativeProjectPath = relativize(root, project.getProjectDir().toPath());
+				String locationName = project.getName() + "-${version}-${name}-${classifier}.zip";
+				locations.add(project
+					.provider(() -> relativeProjectPath.resolve(GENERATED_DOCS + "antora-content/" + locationName)
+						.toString()));
+				locations.addAll(getDependencies().map((dependencies) -> dependencies.stream()
+					.map((dependency) -> relativeProjectPath
+						.resolve(GENERATED_DOCS + "antora-dependencies-content/" + dependency + "/" + locationName))
+					.map(Path::toString)
+					.toList()));
+				return locations;
+			}
+
+			private static Path relativize(Path root, Path subPath) {
+				return toRealPath(root).relativize(toRealPath(subPath)).normalize();
+			}
+
+			@Input
+			@Optional
+			public abstract ListProperty<AlwaysInclude> getAlwaysInclude();
+
+			@Input
+			@Optional
+			public Provider<List<String>> getLocations() {
+				return this.locations;
+			}
+
+			@Input
+			@Optional
+			public abstract SetProperty<String> getDependencies();
+
+		}
+
 	}
 
-	private Path getProjectPath(Project project) {
-		return toRealPath(project.getProjectDir().toPath());
+	public abstract static class AsciidocExtensions {
+
+		@Inject
+		public AsciidocExtensions() {
+
+		}
+
+		@Input
+		@Optional
+		public abstract Property<Boolean> getExcludeJavadocExtension();
+
 	}
 
-	private Path toRealPath(Path path) {
-		try {
-			return Files.exists(path) ? path.toRealPath() : path;
+	public abstract static class ContentSource {
+
+		private final Path root;
+
+		@Inject
+		public ContentSource(Path root) {
+			this.root = root;
 		}
-		catch (IOException ex) {
-			throw new UncheckedIOException(ex);
+
+		@Input
+		public abstract ListProperty<String> getStartPaths();
+
+		void addStartPath(Provider<Directory> startPath) {
+			getStartPaths()
+				.add(startPath.map((dir) -> this.root.relativize(toRealPath(dir.getAsFile().toPath())).toString()));
 		}
+
 	}
 
 }

buildSrc/src/main/java/org/springframework/boot/build/antora/LocalAggregateContentContribution.java

@@ -0,0 +1,48 @@
+/*
+ * Copyright 2012-2024 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.build.antora;
+
+import org.gradle.api.Project;
+import org.gradle.api.file.CopySpec;
+
+import org.springframework.boot.build.antora.Extensions.AntoraExtensionsConfiguration.ZipContentsCollector.AlwaysInclude;
+
+/**
+ * A contribution of aggregate content that cannot be consumed by other projects.
+ *
+ * @author Andy Wilkinson
+ */
+class LocalAggregateContentContribution extends ContentContribution {
+
+	protected LocalAggregateContentContribution(Project project, String name) {
+		super(project, name, "local-aggregate");
+	}
+
+	@Override
+	void produceFrom(CopySpec copySpec) {
+		super.configureProduction(copySpec);
+		configurePlaybookGeneration(this::addToAlwaysInclude);
+	}
+
+	private void addToAlwaysInclude(GenerateAntoraPlaybook task) {
+		task.getAntoraExtensions()
+			.getZipContentsCollector()
+			.getAlwaysInclude()
+			.add(new AlwaysInclude(getName(), "local-aggregate-content"));
+	}
+
+}

buildSrc/src/main/java/org/springframework/boot/build/antora/SourceContribution.java

@@ -0,0 +1,79 @@
+/*
+ * Copyright 2012-2024 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.build.antora;
+
+import org.gradle.api.Project;
+import org.gradle.api.artifacts.Configuration;
+import org.gradle.api.artifacts.dsl.DependencyHandler;
+import org.gradle.api.file.Directory;
+import org.gradle.api.provider.Provider;
+import org.gradle.api.tasks.TaskContainer;
+import org.gradle.api.tasks.TaskProvider;
+import org.gradle.api.tasks.bundling.Zip;
+
+import org.springframework.boot.build.AntoraConventions;
+
+/**
+ * A contribution of source to Antora.
+ *
+ * @author Andy Wilkinson
+ */
+class SourceContribution extends Contribution {
+
+	private static final String CONFIGURATION_NAME = "antoraSource";
+
+	SourceContribution(Project project, String name) {
+		super(project, name);
+	}
+
+	void produce() {
+		Configuration antoraSource = getProject().getConfigurations().create(CONFIGURATION_NAME);
+		TaskProvider<Zip> antoraSourceZip = getProject().getTasks().register("antoraSourceZip", Zip.class, (zip) -> {
+			zip.getDestinationDirectory().set(getProject().getLayout().getBuildDirectory().dir("antora-source"));
+			zip.from(AntoraConventions.ANTORA_SOURCE_DIR);
+			zip.setDescription(
+					"Creates a zip archive of the Antora source in %s.".formatted(AntoraConventions.ANTORA_SOURCE_DIR));
+		});
+		getProject().getArtifacts().add(antoraSource.getName(), antoraSourceZip);
+	}
+
+	void consumeFrom(String path) {
+		Configuration configuration = createConfiguration(getName());
+		DependencyHandler dependencies = getProject().getDependencies();
+		dependencies.add(configuration.getName(),
+				getProject().provider(() -> projectDependency(path, CONFIGURATION_NAME)));
+		Provider<Directory> outputDirectory = outputDirectory("source", getName());
+		TaskContainer tasks = getProject().getTasks();
+		TaskProvider<SyncAntoraSource> syncSource = tasks.register(taskName("sync", "%s", configuration.getName()),
+				SyncAntoraSource.class, (task) -> configureSyncSource(task, path, configuration, outputDirectory));
+		configureAntora(addInputFrom(syncSource, configuration.getName()));
+		configurePlaybookGeneration(
+				(generatePlaybook) -> generatePlaybook.getContentSource().addStartPath(outputDirectory));
+	}
+
+	private void configureSyncSource(SyncAntoraSource task, String path, Configuration configuration,
+			Provider<Directory> outputDirectory) {
+		task.setDescription("Syncs the %s Antora source from %s.".formatted(getName(), path));
+		task.setSource(configuration);
+		task.getOutputDirectory().set(outputDirectory);
+	}
+
+	private Configuration createConfiguration(String name) {
+		return getProject().getConfigurations().create(configurationName(name, "AntoraSource"));
+	}
+
+}

buildSrc/src/main/java/org/springframework/boot/build/antora/SyncAntoraSource.java

@@ -0,0 +1,72 @@
+/*
+ * Copyright 2012-2024 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.build.antora;
+
+import javax.inject.Inject;
+
+import org.gradle.api.DefaultTask;
+import org.gradle.api.file.ArchiveOperations;
+import org.gradle.api.file.CopySpec;
+import org.gradle.api.file.DirectoryProperty;
+import org.gradle.api.file.FileCollection;
+import org.gradle.api.file.FileSystemOperations;
+import org.gradle.api.tasks.InputFiles;
+import org.gradle.api.tasks.OutputDirectory;
+import org.gradle.api.tasks.TaskAction;
+
+/**
+ * Task sync Antora source.
+ *
+ * @author Andy Wilkinson
+ */
+public abstract class SyncAntoraSource extends DefaultTask {
+
+	private final FileSystemOperations fileSystemOperations;
+
+	private final ArchiveOperations archiveOperations;
+
+	private FileCollection source;
+
+	@Inject
+	public SyncAntoraSource(FileSystemOperations fileSystemOperations, ArchiveOperations archiveOperations) {
+		this.fileSystemOperations = fileSystemOperations;
+		this.archiveOperations = archiveOperations;
+	}
+
+	@OutputDirectory
+	public abstract DirectoryProperty getOutputDirectory();
+
+	@InputFiles
+	public FileCollection getSource() {
+		return this.source;
+	}
+
+	public void setSource(FileCollection source) {
+		this.source = source;
+	}
+
+	@TaskAction
+	void syncAntoraSource() {
+		this.fileSystemOperations.sync(this::syncAntoraSource);
+	}
+
+	private void syncAntoraSource(CopySpec sync) {
+		sync.into(getOutputDirectory());
+		this.source.getFiles().forEach((file) -> sync.from(this.archiveOperations.zipTree(file)));
+	}
+
+}

buildSrc/src/test/java/org/springframework/boot/build/antora/GenerateAntoraPlaybookTests.java

@@ -19,13 +19,15 @@ package org.springframework.boot.build.antora;
 import java.io.File;
 import java.nio.file.Files;
 import java.nio.file.Path;
-import java.util.Map;
+import java.util.List;
 
 import org.gradle.api.Project;
 import org.gradle.testfixtures.ProjectBuilder;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.io.TempDir;
 
+import org.springframework.boot.build.antora.Extensions.AntoraExtensionsConfiguration.ZipContentsCollector.AlwaysInclude;
+import org.springframework.boot.build.antora.GenerateAntoraPlaybook.AntoraExtensions.ZipContentsCollector;
 import org.springframework.util.function.ThrowingConsumer;
 
 import static org.assertj.core.api.Assertions.assertThat;
@@ -43,23 +45,26 @@ class GenerateAntoraPlaybookTests {
 	@Test
 	void writePlaybookGeneratesExpectedContent() throws Exception {
 		writePlaybookYml((task) -> {
-			task.getXrefStubs().addAll("appendix:.*", "api:.*", "reference:.*");
-			task.getAlwaysInclude().set(Map.of("name", "test", "classifier", "local-aggregate-content"));
+			task.getAntoraExtensions().getXref().getStubs().addAll("appendix:.*", "api:.*", "reference:.*");
+			ZipContentsCollector zipContentsCollector = task.getAntoraExtensions().getZipContentsCollector();
+			zipContentsCollector.getAlwaysInclude().set(List.of(new AlwaysInclude("test", "local-aggregate-content")));
+			zipContentsCollector.getDependencies().add("test-dependency");
 		});
 		String actual = Files.readString(this.temp.toPath()
 			.resolve("rootproject/project/build/generated/docs/antora-playbook/antora-playbook.yml"));
 		String expected = Files
 			.readString(Path.of("src/test/resources/org/springframework/boot/build/antora/expected-playbook.yml"));
-		System.out.println(actual);
 		assertThat(actual.replace('\\', '/')).isEqualToNormalizingNewlines(expected.replace('\\', '/'));
 	}
 
 	@Test
 	void writePlaybookWhenHasJavadocExcludeGeneratesExpectedContent() throws Exception {
 		writePlaybookYml((task) -> {
-			task.getXrefStubs().addAll("appendix:.*", "api:.*", "reference:.*");
-			task.getAlwaysInclude().set(Map.of("name", "test", "classifier", "local-aggregate-content"));
-			task.getExcludeJavadocExtension().set(true);
+			task.getAntoraExtensions().getXref().getStubs().addAll("appendix:.*", "api:.*", "reference:.*");
+			ZipContentsCollector zipContentsCollector = task.getAntoraExtensions().getZipContentsCollector();
+			zipContentsCollector.getAlwaysInclude().set(List.of(new AlwaysInclude("test", "local-aggregate-content")));
+			zipContentsCollector.getDependencies().add("test-dependency");
+			task.getAsciidocExtensions().getExcludeJavadocExtension().set(true);
 		});
 		String actual = Files.readString(this.temp.toPath()
 			.resolve("rootproject/project/build/generated/docs/antora-playbook/antora-playbook.yml"));

buildSrc/src/test/resources/org/springframework/boot/build/antora/expected-playbook.yml

@@ -13,7 +13,7 @@ antora:
       name: test
     locations:
     - project/build/generated/docs/antora-content/test-${version}-${name}-${classifier}.zip
-    - project/build/generated/docs/antora-dependencies-content/test-${version}-${name}-${classifier}.zip
+    - project/build/generated/docs/antora-dependencies-content/test-dependency/test-${version}-${name}-${classifier}.zip
     version_file: gradle.properties
   - require: '@springio/antora-extensions/root-component-extension'
     root_component_name: boot

spring-boot-project/spring-boot-actuator-autoconfigure/build.gradle

@@ -1,6 +1,6 @@
 plugins {
 	id "java-library"
-	id "org.antora"
+	id "org.springframework.boot.antora-contributor"
 	id "org.springframework.boot.auto-configuration"
 	id "org.springframework.boot.configuration-properties"
 	id "org.springframework.boot.deployed"
@@ -9,10 +9,6 @@ plugins {
 
 description = "Spring Boot Actuator AutoConfigure"
 
-configurations {
-	antoraContent
-}
-
 dependencies {
 	api(project(":spring-boot-project:spring-boot-actuator"))
 	api(project(":spring-boot-project:spring-boot"))
@@ -215,36 +211,18 @@ def documentationTest = tasks.register("documentationTest", Test) {
 	}
 }
 
-def antoraActuatorRestApiLocalAggregateContent  = tasks.register("antoraActuatorRestApiLocalAggregateContent", Zip) {
-	destinationDirectory = layout.buildDirectory.dir('generated/docs/antora-content')
-	archiveClassifier = "actuator-rest-api-local-aggregate-content"
-	from(tasks.getByName("generateAntoraYml")) {
-		into "modules"
-	}
-}
-
-def antoraActuatorRestApiAggregateContent = tasks.register("antoraActuatorRestApiAggregateContent", Zip) {
-	dependsOn documentationTest
-	inputs.dir(layout.buildDirectory.dir("generated-snippets"))
-		.withPathSensitivity(PathSensitivity.RELATIVE)
-		.withPropertyName("generatedSnippets")
-	destinationDirectory = layout.buildDirectory.dir('generated/docs/antora-content')
-	archiveClassifier = "actuator-rest-api-aggregate-content"
-	from(layout.buildDirectory.dir("generated-snippets")) {
-		into "modules/api/partials/rest/actuator"
+antoraContributions {
+	'actuator-rest-api' {
+		aggregateContent {
+			from(documentationTest.map { layout.buildDirectory.dir("generated-snippets") }) {
+				into "modules/api/partials/rest/actuator"
+			}
+		}
+		localAggregateContent {
+			from(tasks.named("generateAntoraYml")) {
+				into "modules"
+			}
+		}
+		source()
 	}
 }
-
-tasks.named("generateAntoraPlaybook") {
-	alwaysInclude = [name: "actuator-rest-api", classifier: "local-aggregate-content"]
-	dependsOn antoraActuatorRestApiLocalAggregateContent
-}
-
-tasks.named("antora") {
-	inputs.files(antoraActuatorRestApiAggregateContent)
-}
-
-artifacts {
-	antoraContent antoraActuatorRestApiAggregateContent
-}
-

spring-boot-project/spring-boot-docs/build.gradle

@@ -2,6 +2,8 @@ plugins {
 	id "dev.adamko.dokkatoo-html"
 	id "java"
 	id "org.antora"
+	id "org.springframework.boot.antora-contributor"
+	id "org.springframework.boot.antora-dependencies"
 	id "org.springframework.boot.deployed"
 	id 'org.jetbrains.kotlin.jvm'
 }
@@ -14,7 +16,6 @@ configurations {
 	remoteSpringApplicationExample
 	springApplicationExample
 	testSlices
-	antoraContent
 	all {
 		resolutionStrategy.eachDependency { DependencyResolveDetails details ->
 			if (details.requested.module.group == "org.apache.kafka" && details.requested.module.name == "kafka-server-common") {
@@ -179,10 +180,6 @@ dependencies {
 	springApplicationExample(platform(project(":spring-boot-project:spring-boot-dependencies")))
 	springApplicationExample(project(path: ":spring-boot-project:spring-boot-starters:spring-boot-starter-web"))
 
-	antoraContent(project(path: ":spring-boot-project:spring-boot-actuator-autoconfigure", configuration: "antoraContent"))
-	antoraContent(project(path: ":spring-boot-project:spring-boot-tools:spring-boot-gradle-plugin", configuration: "antoraContent"))
-	antoraContent(project(path: ":spring-boot-project:spring-boot-tools:spring-boot-maven-plugin", configuration: "antoraContent"))
-
 	testImplementation(project(":spring-boot-project:spring-boot-actuator-autoconfigure"))
 	testImplementation(project(":spring-boot-project:spring-boot-tools:spring-boot-test-support"))
 	testImplementation("org.assertj:assertj-core")
@@ -308,86 +305,86 @@ def getRelativeExamplesPath(var outputs) {
 	'example$example-output/' + fileName
 }
 
-def antoraRootAggregateContent = tasks.register("antoraRootAggregateContent", Zip) {
-	destinationDirectory = layout.buildDirectory.dir('generated/docs/antora-content')
-	archiveClassifier = "root-aggregate-content"
-	from("src/main") {
-		into "modules/ROOT/examples"
-	}
-	from(project.configurations.configurationProperties) {
-		eachFile {
-			it.path = rootProject
-				.projectDir
-				.toPath()
-				.relativize(it.file.toPath())
-				.toString()
-				.replace('\\', '/')
-				.replaceAll('.*/([^/]+)/build.*', 'modules/ROOT/partials/$1/spring-configuration-metadata.json')
-		}
-	}
-	from(runRemoteSpringApplicationExample) {
-		into "modules/ROOT/examples"
-	}
-	from(documentDevtoolsPropertyDefaults) {
-		into "modules/ROOT/partials/propertydefaults"
-	}
-	from(documentStarters) {
-		into "modules/ROOT/partials/starters"
-	}
-	from(documentTestSlices) {
-		into "modules/appendix/partials/slices"
-	}
-	from(runSpringApplicationExample) {
-		into "modules/ROOT/partials/application"
-	}
-	from(runLoggingFormatExample) {
-		into "modules/ROOT/partials/logging"
-	}
-	from(documentDependencyVersionCoordinates) {
-		into "modules/appendix/partials/dependency-versions"
-	}
-	from(documentDependencyVersionProperties) {
-		into "modules/appendix/partials/dependency-versions"
+antoraDependencies {
+	'actuator-rest-api' {
+		path = ":spring-boot-project:spring-boot-actuator-autoconfigure"
+		source()
+		aggregateContent()
 	}
-	from(documentAutoConfigurationClasses) {
-		into "modules/appendix/partials/auto-configuration-classes"
+	'gradle-plugin' {
+		path = ":spring-boot-project:spring-boot-tools:spring-boot-gradle-plugin"
+		source()
+		catalogContent()
 	}
-	from(documentConfigurationProperties) {
-		into "modules/appendix/partials/configuration-properties"
-	}
-	from(tasks.getByName("generateAntoraYml")) {
-		into "modules"
+	'maven-plugin' {
+		path = ":spring-boot-project:spring-boot-tools:spring-boot-maven-plugin"
+		source()
+		catalogContent()
+		aggregateContent()
 	}
 }
 
-def antoraApiCatalogContent = tasks.register("antoraApiCatalogContent", Zip) {
-	destinationDirectory = layout.buildDirectory.dir('generated/docs/antora-content')
-	archiveClassifier = "api-catalog-content"
-	from(aggregatedJavadoc) {
-		into "java"
-	}
-	from(tasks.named("dokkatooGeneratePublicationHtml")) {
-		into "kotlin"
+antoraContributions {
+	'api' {
+		catalogContent {
+			from(aggregatedJavadoc) {
+				into "java"
+			}
+			from(tasks.named("dokkatooGeneratePublicationHtml")) {
+				into "kotlin"
+			}
+		}
 	}
-}
-
-def copyAntoraContentDependencies = tasks.register("copyAntoraContentDependencies", Copy) {
-	into layout.buildDirectory.dir('generated/docs/antora-dependencies-content')
-	from(configurations.antoraContent)
-	rename("spring-boot-actuator-autoconfigure", "spring-boot-docs")
-	rename("spring-boot-maven-plugin", "spring-boot-docs")
-	rename("spring-boot-gradle-plugin", "spring-boot-docs")
-}
-
-tasks.named("antora") {
-	inputs.files(antoraRootAggregateContent, antoraApiCatalogContent, copyAntoraContentDependencies)
-}
-
-gradle.projectsEvaluated {
-	def mavenPublication = publishing.publications.getByName("maven");
-	configurations.antoraContent.dependencies.forEach { dependency ->
-		dependency.dependencyProject.configurations.getByName(dependency.targetConfiguration)
-			.artifacts.forEach(mavenPublication::artifact)
+	'root' {
+		aggregateContent {
+			from("src/main") {
+				into "modules/ROOT/examples"
+			}
+			from(project.configurations.configurationProperties) {
+				eachFile {
+					it.path = rootProject
+						.projectDir
+						.toPath()
+						.relativize(it.file.toPath())
+						.toString()
+						.replace('\\', '/')
+						.replaceAll('.*/([^/]+)/build.*', 'modules/ROOT/partials/$1/spring-configuration-metadata.json')
+				}
+			}
+			from(runRemoteSpringApplicationExample) {
+				into "modules/ROOT/examples"
+			}
+			from(documentDevtoolsPropertyDefaults) {
+				into "modules/ROOT/partials/propertydefaults"
+			}
+			from(documentStarters) {
+				into "modules/ROOT/partials/starters"
+			}
+			from(documentTestSlices) {
+				into "modules/appendix/partials/slices"
+			}
+			from(runSpringApplicationExample) {
+				into "modules/ROOT/partials/application"
+			}
+			from(runLoggingFormatExample) {
+				into "modules/ROOT/partials/logging"
+			}
+			from(documentDependencyVersionCoordinates) {
+				into "modules/appendix/partials/dependency-versions"
+			}
+			from(documentDependencyVersionProperties) {
+				into "modules/appendix/partials/dependency-versions"
+			}
+			from(documentAutoConfigurationClasses) {
+				into "modules/appendix/partials/auto-configuration-classes"
+			}
+			from(documentConfigurationProperties) {
+				into "modules/appendix/partials/configuration-properties"
+			}
+			from(tasks.getByName("generateAntoraYml")) {
+				into "modules"
+			}
+		}
 	}
 }
 
@@ -396,12 +393,3 @@ dokkatoo {
 		includes.from("src/docs/dokkatoo/dokka-overview.md")
 	}
 }
-
-publishing {
-	publications {
-		getByName("maven") {
-			artifact antoraRootAggregateContent
-			artifact antoraApiCatalogContent
-		}
-	}
-}

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/build.gradle

@@ -5,7 +5,7 @@ import org.gradle.plugins.ide.eclipse.model.Library
 plugins {
 	id "java-gradle-plugin"
 	id "maven-publish"
-	id "org.antora"
+	id "org.springframework.boot.antora-contributor"
 	id "org.springframework.boot.docker-test"
 	id "org.springframework.boot.maven-repository"
 	id "org.springframework.boot.optional-dependencies"
@@ -14,7 +14,6 @@ plugins {
 description = "Spring Boot Gradle Plugins"
 
 configurations {
-	antoraContent
 	"testCompileClasspath" {
 		// Downgrade SLF4J is required for tests to run in Eclipse
 		resolutionStrategy.force("org.slf4j:slf4j-api:1.7.36")
@@ -166,35 +165,25 @@ javadoc {
 	}
 }
 
-def antoraGradlePluginLocalAggregateContent  = tasks.register("antoraGradlePluginLocalAggregateContent", Zip) {
-	destinationDirectory = layout.buildDirectory.dir('generated/docs/antora-content')
-	archiveClassifier = "gradle-plugin-local-aggregate-content"
-	from(tasks.getByName("generateAntoraYml")) {
-		into "modules"
-	}
-}
-
-def antoraGradlePluginCatalogContent = tasks.register("antoraGradlePluginCatalogContent", Zip) {
-	destinationDirectory = layout.buildDirectory.dir('generated/docs/antora-content')
-	archiveClassifier = "gradle-plugin-catalog-content"
-	from(javadoc) {
-		into "api/java"
+antoraContributions {
+	'gradle-plugin' {
+		catalogContent {
+			from(javadoc) {
+				into("api/java")
+			}
+		}
+		localAggregateContent {
+			from(tasks.named("generateAntoraYml")) {
+				into "modules"
+			}
+		}
+		source()
 	}
 }
 
 tasks.named("generateAntoraPlaybook") {
-	xrefStubs = ["appendix:.*", "api:.*", "reference:.*"]
-	excludeJavadocExtension = true
-	alwaysInclude = [name: "gradle-plugin", classifier: "local-aggregate-content"]
-	dependsOn antoraGradlePluginLocalAggregateContent
-}
-
-tasks.named("antora") {
-	inputs.files(antoraGradlePluginLocalAggregateContent, antoraGradlePluginCatalogContent)
-}
-
-artifacts {
-	antoraContent antoraGradlePluginCatalogContent
+	antoraExtensions.xref.stubs = ["appendix:.*", "api:.*", "reference:.*"]
+	asciidocExtensions.excludeJavadocExtension = true
 }
 
 toolchain {

spring-boot-project/spring-boot-tools/spring-boot-maven-plugin/build.gradle

@@ -1,5 +1,5 @@
 plugins {
-	id "org.antora"
+	id "org.springframework.boot.antora-contributor"
 	id "org.springframework.boot.maven-plugin"
 	id "org.springframework.boot.optional-dependencies"
 	id "org.springframework.boot.docker-test"
@@ -9,7 +9,6 @@ description = "Spring Boot Maven Plugin"
 
 configurations {
 	dependenciesBom
-	antoraContent
 }
 
 dependencies {
@@ -148,45 +147,30 @@ tasks.named("documentPluginGoals") {
 	]
 }
 
-def antoraMavenPluginLocalAggregateContent  = tasks.register("antoraMavenPluginLocalAggregateContent", Zip) {
-	destinationDirectory = layout.buildDirectory.dir('generated/docs/antora-content')
-	archiveClassifier = "maven-plugin-local-aggregate-content"
-	from(tasks.getByName("generateAntoraYml")) {
-		into "modules"
-	}
-}
-
-def antoraMavenPluginAggregateContent = tasks.register("antoraMavenPluginAggregateContent", Zip) {
-	destinationDirectory = layout.buildDirectory.dir('generated/docs/antora-content')
-	archiveClassifier = "maven-plugin-aggregate-content"
-	from(documentPluginGoals) {
-		into "modules/maven-plugin/partials/goals"
-	}
-}
-
-def antoraMavenPluginCatalogContent = tasks.register("antoraMavenPluginCatalogContent", Zip) {
-	destinationDirectory = layout.buildDirectory.dir('generated/docs/antora-content')
-	archiveClassifier = "maven-plugin-catalog-content"
-	from(javadoc) {
-		into "api/java"
+antoraContributions {
+	'maven-plugin' {
+		aggregateContent {
+			from(documentPluginGoals) {
+				into "modules/maven-plugin/partials/goals"
+			}
+		}
+		catalogContent {
+			from(javadoc) {
+				into "api/java"
+			}
+		}
+		localAggregateContent {
+			from(tasks.named("generateAntoraYml")) {
+				into "modules"
+			}
+		}
+		source()
 	}
 }
 
 tasks.named("generateAntoraPlaybook") {
-	xrefStubs = ["appendix:.*", "api:.*", "reference:.*", "how-to:.*"]
-	excludeJavadocExtension = true
-	alwaysInclude = [name: "maven-plugin", classifier: "local-aggregate-content"]
-	dependsOn antoraMavenPluginLocalAggregateContent
-}
-
-
-tasks.named("antora") {
-	inputs.files(antoraMavenPluginLocalAggregateContent, antoraMavenPluginAggregateContent, antoraMavenPluginCatalogContent)
-}
-
-artifacts {
-	antoraContent antoraMavenPluginAggregateContent
-	antoraContent antoraMavenPluginCatalogContent
+	antoraExtensions.xref.stubs = ["appendix:.*", "api:.*", "reference:.*", "how-to:.*"]
+	asciidocExtensions.excludeJavadocExtension = true
 }
 
 tasks.named("dockerTest").configure {