Provide Runtime Hints for Beans used in Pre/PostAuthorize Expressions

Closes spring-projectsgh-14652

config/src/main/java/org/springframework/security/config/annotation/method/configuration/PrePostAuthorizeBeanFactoryInitializationAotProcessor.java

@@ -0,0 +1,199 @@
+/*
+ * Copyright 2002-2024 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.security.config.annotation.method.configuration;
+
+import java.lang.annotation.Annotation;
+import java.lang.reflect.AnnotatedElement;
+import java.lang.reflect.Field;
+import java.lang.reflect.Method;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+import java.util.function.Function;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+
+import org.springframework.aot.generate.GenerationContext;
+import org.springframework.aot.hint.MemberCategory;
+import org.springframework.aot.hint.RuntimeHints;
+import org.springframework.aot.hint.TypeReference;
+import org.springframework.beans.factory.NoSuchBeanDefinitionException;
+import org.springframework.beans.factory.aot.BeanFactoryInitializationAotContribution;
+import org.springframework.beans.factory.aot.BeanFactoryInitializationAotProcessor;
+import org.springframework.beans.factory.aot.BeanFactoryInitializationCode;
+import org.springframework.beans.factory.config.BeanDefinition;
+import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
+import org.springframework.beans.factory.support.RegisteredBean;
+import org.springframework.core.annotation.AnnotationConfigurationException;
+import org.springframework.core.annotation.MergedAnnotation;
+import org.springframework.core.annotation.MergedAnnotations;
+import org.springframework.core.annotation.RepeatableContainers;
+import org.springframework.core.log.LogMessage;
+import org.springframework.expression.spel.SpelNode;
+import org.springframework.expression.spel.ast.BeanReference;
+import org.springframework.expression.spel.standard.SpelExpression;
+import org.springframework.expression.spel.standard.SpelExpressionParser;
+import org.springframework.security.access.prepost.PostAuthorize;
+import org.springframework.security.access.prepost.PreAuthorize;
+import org.springframework.util.ReflectionUtils;
+
+/**
+ * AOT BeanFactoryInitializationAotProcessor that detects the presence of
+ * {@link PreAuthorize} and {@link PostAuthorize} on annotated elements of all registered
+ * beans and register runtime hints for the beans used within the security expressions.
+ *
+ * @author Marcus da Coregio
+ * @since 6.3
+ */
+class PrePostAuthorizeBeanFactoryInitializationAotProcessor implements BeanFactoryInitializationAotProcessor {
+
+	@Override
+	public BeanFactoryInitializationAotContribution processAheadOfTime(ConfigurableListableBeanFactory beanFactory) {
+		Class<?>[] beanTypes = Arrays.stream(beanFactory.getBeanDefinitionNames())
+			.map((beanName) -> RegisteredBean.of(beanFactory, beanName).getBeanClass())
+			.toArray(Class<?>[]::new);
+		return new PrePostAuthorizeContribution(beanTypes, beanFactory);
+	}
+
+	private static class PrePostAuthorizeContribution implements BeanFactoryInitializationAotContribution {
+
+		private final Log logger = LogFactory.getLog(getClass());
+
+		private final Class<?>[] types;
+
+		private final ConfigurableListableBeanFactory beanFactory;
+
+		private final SpelExpressionParser expressionParser = new SpelExpressionParser();
+
+		PrePostAuthorizeContribution(Class<?>[] types, ConfigurableListableBeanFactory beanFactory) {
+			this.types = types;
+			this.beanFactory = beanFactory;
+		}
+
+		@Override
+		public void applyTo(GenerationContext generationContext,
+				BeanFactoryInitializationCode beanFactoryInitializationCode) {
+			List<PreAuthorize> preAuthorizes = new ArrayList<>();
+			List<PostAuthorize> postAuthorizes = new ArrayList<>();
+			for (Class<?> type : this.types) {
+				preAuthorizes.addAll(collectAnnotations(type, PreAuthorize.class));
+				postAuthorizes.addAll(collectAnnotations(type, PostAuthorize.class));
+			}
+			Set<String> expressions = Stream
+				.concat(preAuthorizes.stream().map(PreAuthorize::value),
+						postAuthorizes.stream().map(PostAuthorize::value))
+				.collect(Collectors.toSet());
+			Set<String> beanNames = new HashSet<>();
+			for (String expr : expressions) {
+				beanNames.addAll(extractBeanNames(expr));
+			}
+			registerHints(beanNames, generationContext.getRuntimeHints());
+		}
+
+		private void registerHints(Set<String> beanNames, RuntimeHints runtimeHints) {
+			for (String beanName : beanNames) {
+				try {
+					BeanDefinition definition = this.beanFactory.getBeanDefinition(beanName);
+					runtimeHints.reflection()
+						.registerType(TypeReference.of(definition.getBeanClassName()),
+								MemberCategory.INVOKE_DECLARED_METHODS);
+				}
+				catch (NoSuchBeanDefinitionException ex) {
+					this.logger.debug(LogMessage.format(
+							"""
+									Could not register runtime hints for bean with name [%s] because it is not available, please provide
+									the needed hints manually""",
+							beanName));
+				}
+			}
+		}
+
+		private <A extends Annotation> List<A> collectAnnotations(Class<?> type, Class<A> annotationType) {
+			List<A> annotations = new ArrayList<>();
+			A classAnnotation = findDistinctAnnotation(type, annotationType, MergedAnnotation::synthesize);
+			if (classAnnotation != null) {
+				annotations.add(classAnnotation);
+			}
+			for (Method method : type.getDeclaredMethods()) {
+				A methodAnnotation = findDistinctAnnotation(method, annotationType, MergedAnnotation::synthesize);
+				if (methodAnnotation != null) {
+					annotations.add(methodAnnotation);
+				}
+			}
+			return annotations;
+		}
+
+		private Set<String> extractBeanNames(String rawExpression) {
+			SpelExpression expression = this.expressionParser.parseRaw(rawExpression);
+			SpelNode node = expression.getAST();
+			Set<String> beanNames = new HashSet<>();
+			resolveBeanNames(beanNames, node);
+			return beanNames;
+		}
+
+		private void resolveBeanNames(Set<String> beanNames, SpelNode node) {
+			if (node instanceof BeanReference br) {
+				beanNames.add(resolveBeanName(br));
+			}
+			int childCount = node.getChildCount();
+			if (childCount == 0) {
+				return;
+			}
+			for (int i = 0; i < childCount; i++) {
+				resolveBeanNames(beanNames, node.getChild(i));
+			}
+		}
+
+		private String resolveBeanName(BeanReference br) {
+			try {
+				Field field = ReflectionUtils.findField(BeanReference.class, "beanName");
+				field.setAccessible(true);
+				return (String) field.get(br);
+			}
+			catch (IllegalAccessException ex) {
+				throw new IllegalStateException("Could not resolve beanName for BeanReference [%s]".formatted(br), ex);
+			}
+		}
+
+		private static <A extends Annotation> A findDistinctAnnotation(AnnotatedElement annotatedElement,
+				Class<A> annotationType, Function<MergedAnnotation<A>, A> map) {
+			MergedAnnotations mergedAnnotations = MergedAnnotations.from(annotatedElement,
+					MergedAnnotations.SearchStrategy.TYPE_HIERARCHY, RepeatableContainers.none());
+			List<A> annotations = mergedAnnotations.stream(annotationType)
+				.map(MergedAnnotation::withNonMergedAttributes)
+				.map(map)
+				.distinct()
+				.toList();
+
+			return switch (annotations.size()) {
+				case 0 -> null;
+				case 1 -> annotations.get(0);
+				default -> throw new AnnotationConfigurationException("""
+						Please ensure there is one unique annotation of type @%s attributed to %s. \
+						Found %d competing annotations: %s""".formatted(annotationType.getName(), annotatedElement,
+						annotations.size(), annotations));
+			};
+		}
+
+	}
+
+}

config/src/main/java/org/springframework/security/config/annotation/method/configuration/PrePostMethodSecurityConfiguration.java

@@ -152,6 +152,12 @@ static MethodInterceptor postFilterAuthorizationMethodInterceptor(
 		});
 	}
 
+	@Bean
+	@Role(BeanDefinition.ROLE_INFRASTRUCTURE)
+	static PrePostAuthorizeBeanFactoryInitializationAotProcessor prePostAuthorizeBeanFactoryInitializationAotProcessor() {
+		return new PrePostAuthorizeBeanFactoryInitializationAotProcessor();
+	}
+
 	private static MethodSecurityExpressionHandler defaultExpressionHandler(
 			ObjectProvider<GrantedAuthorityDefaults> defaultsProvider,
 			ObjectProvider<RoleHierarchy> roleHierarchyProvider, ApplicationContext context) {