Add Coroutine Support

Closes gh-12080

config/src/test/java/org/springframework/security/config/annotation/method/configuration/EnableAuthorizationManagerReactiveMethodSecurityTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 the original author or authors.
+ * Copyright 2002-2023 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.
@@ -80,7 +80,7 @@ public class EnableAuthorizationManagerReactiveMethodSecurityTests {
 			.withMessage("The returnType class java.lang.String on public abstract java.lang.String "
 					+ "org.springframework.security.config.annotation.method.configuration.ReactiveMessageService"
 					+ ".notPublisherPreAuthorizeFindById(long) must return an instance of org.reactivestreams"
-					+ ".Publisher (for example, a Mono or Flux) in order to support Reactor Context");
+					+ ".Publisher (for example, a Mono or Flux) or the function must be a Kotlin coroutine in order to support Reactor Context");
 	}
 
 	@Test

config/src/test/java/org/springframework/security/config/annotation/method/configuration/EnableReactiveMethodSecurityTests.java

@@ -78,7 +78,7 @@ public class EnableReactiveMethodSecurityTests {
 			.withMessage("The returnType class java.lang.String on public abstract java.lang.String "
 					+ "org.springframework.security.config.annotation.method.configuration.ReactiveMessageService"
 					+ ".notPublisherPreAuthorizeFindById(long) must return an instance of org.reactivestreams"
-					+ ".Publisher (for example, a Mono or Flux) in order to support Reactor Context");
+					+ ".Publisher (for example, a Mono or Flux) or the function must be a Kotlin coroutine in order to support Reactor Context");
 	}
 
 	@Test

config/src/test/kotlin/org/springframework/security/config/annotation/method/configuration/KotlinEnableReactiveMethodSecurityTests.kt

@@ -41,8 +41,7 @@ import org.springframework.test.context.junit.jupiter.SpringExtension
 
 @ExtendWith(SpringExtension::class)
 @ContextConfiguration
-// no authorization manager due to https://github.com/spring-projects/spring-security/issues/12080
-class KotlinEnableReactiveMethodSecurityNoAuthorizationManagerTests {
+class KotlinEnableReactiveMethodSecurityTests {
 
     private lateinit var delegate: KotlinReactiveMessageService
 
@@ -138,6 +137,39 @@ class KotlinEnableReactiveMethodSecurityNoAuthorizationManagerTests {
         coVerify(exactly = 1) { delegate.suspendingPreAuthorizeHasRole() }
     }
 
+    @Test
+    @WithMockUser
+    fun `suspendingPrePostAuthorizeHasRoleContainsName when not pre authorized then delegate not called`() {
+        assertThatExceptionOfType(AccessDeniedException::class.java).isThrownBy {
+            runBlocking {
+                messageService!!.suspendingPrePostAuthorizeHasRoleContainsName()
+            }
+        }
+        verify { delegate wasNot Called }
+    }
+
+    @Test
+    @WithMockUser(authorities = ["ROLE_ADMIN"])
+    fun `suspendingPrePostAuthorizeHasRoleContainsName when not post authorized then exception`() {
+        coEvery { delegate.suspendingPrePostAuthorizeHasRoleContainsName() } returns "wrong"
+        assertThatExceptionOfType(AccessDeniedException::class.java).isThrownBy {
+            runBlocking {
+                messageService!!.suspendingPrePostAuthorizeHasRoleContainsName()
+            }
+        }
+        coVerify(exactly = 1) { delegate.suspendingPrePostAuthorizeHasRoleContainsName() }
+    }
+
+    @Test
+    @WithMockUser(authorities = ["ROLE_ADMIN"])
+    fun `suspendingPrePostAuthorizeHasRoleContainsName when authorized then success`() {
+        coEvery { delegate.suspendingPrePostAuthorizeHasRoleContainsName() } returns "user"
+        runBlocking {
+            assertThat(messageService!!.suspendingPrePostAuthorizeHasRoleContainsName()).contains("user")
+        }
+        coVerify(exactly = 1) { delegate.suspendingPrePostAuthorizeHasRoleContainsName() }
+    }
+
     @Test
     @WithMockUser(authorities = ["ROLE_ADMIN"])
     fun `suspendingFlowPreAuthorize when user has role then success`() {
@@ -181,6 +213,33 @@ class KotlinEnableReactiveMethodSecurityNoAuthorizationManagerTests {
         verify { delegate wasNot Called }
     }
 
+    @Test
+    fun `suspendingFlowPrePostAuthorizeBean when not pre authorized then delegate not called`() {
+        assertThatExceptionOfType(AccessDeniedException::class.java).isThrownBy {
+            runBlocking {
+                messageService!!.suspendingFlowPrePostAuthorizeBean(true).collect()
+            }
+        }
+    }
+
+    @Test
+    @WithMockUser(roles = ["ADMIN"])
+    fun `suspendingFlowPrePostAuthorizeBean when not post authorized then denied`() {
+        assertThatExceptionOfType(AccessDeniedException::class.java).isThrownBy {
+            runBlocking {
+                messageService!!.suspendingFlowPrePostAuthorizeBean(false).collect()
+            }
+        }
+    }
+
+    @Test
+    @WithMockUser(roles = ["ADMIN"])
+    fun `suspendingFlowPrePostAuthorizeBean when authorized then success`() {
+        runBlocking {
+            assertThat(messageService!!.suspendingFlowPrePostAuthorizeBean(true).toList()).containsExactly(1, 2, 3)
+        }
+    }
+
     @Test
     @WithMockUser(authorities = ["ROLE_ADMIN"])
     fun `suspendingFlowPreAuthorizeDelegate when user has role then delegate called`() {
@@ -244,8 +303,35 @@ class KotlinEnableReactiveMethodSecurityNoAuthorizationManagerTests {
         coVerify(exactly = 1) { delegate.flowPreAuthorize() }
     }
 
+    @Test
+    fun `flowPrePostAuthorize when not pre authorized then denied`() {
+        assertThatExceptionOfType(AccessDeniedException::class.java).isThrownBy {
+            runBlocking {
+                messageService!!.flowPrePostAuthorize(true).collect()
+            }
+        }
+    }
+
+    @Test
+    @WithMockUser(roles = ["ADMIN"])
+    fun `flowPrePostAuthorize when not post authorized then denied`() {
+        assertThatExceptionOfType(AccessDeniedException::class.java).isThrownBy {
+            runBlocking {
+                messageService!!.flowPrePostAuthorize(false).collect()
+            }
+        }
+    }
+
+    @Test
+    @WithMockUser(roles = ["ADMIN"])
+    fun `flowPrePostAuthorize when authorized then success`() {
+        runBlocking {
+            assertThat(messageService!!.flowPrePostAuthorize(true).toList()).containsExactly(1, 2, 3)
+        }
+    }
+
     @Configuration
-    @EnableReactiveMethodSecurity(useAuthorizationManager = false)
+    @EnableReactiveMethodSecurity
     open class Config {
         var delegate = mockk<KotlinReactiveMessageService>()
 

config/src/test/kotlin/org/springframework/security/config/annotation/method/configuration/KotlinReactiveMessageService.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2021 the original author or authors.
+ * Copyright 2002-2023 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.
@@ -30,15 +30,21 @@ interface KotlinReactiveMessageService {
 
     suspend fun suspendingPreAuthorizeDelegate(): String
 
+    suspend fun suspendingPrePostAuthorizeHasRoleContainsName(): String
+
     suspend fun suspendingFlowPreAuthorize(): Flow<Int>
 
     suspend fun suspendingFlowPostAuthorize(id: Boolean): Flow<Int>
 
     suspend fun suspendingFlowPreAuthorizeDelegate(): Flow<Int>
 
+    suspend fun suspendingFlowPrePostAuthorizeBean(id: Boolean): Flow<Int>
+
     fun flowPreAuthorize(): Flow<Int>
 
     fun flowPostAuthorize(id: Boolean): Flow<Int>
 
     fun flowPreAuthorizeDelegate(): Flow<Int>
+
+    fun flowPrePostAuthorize(id: Boolean): Flow<Int>
 }

config/src/test/kotlin/org/springframework/security/config/annotation/method/configuration/KotlinReactiveMessageServiceImpl.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2021 the original author or authors.
+ * Copyright 2002-2023 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.
@@ -47,6 +47,12 @@ class KotlinReactiveMessageServiceImpl(val delegate: KotlinReactiveMessageServic
         return "user"
     }
 
+    @PreAuthorize("hasRole('ADMIN')")
+    @PostAuthorize("returnObject?.contains(authentication?.name)")
+    override suspend fun suspendingPrePostAuthorizeHasRoleContainsName(): String {
+        return delegate.suspendingPrePostAuthorizeHasRoleContainsName()
+    }
+
     @PreAuthorize("hasRole('ADMIN')")
     override suspend fun suspendingPreAuthorizeDelegate(): String {
         return delegate.suspendingPreAuthorizeHasRole()
@@ -80,6 +86,18 @@ class KotlinReactiveMessageServiceImpl(val delegate: KotlinReactiveMessageServic
         return delegate.flowPreAuthorize()
     }
 
+    @PreAuthorize("hasRole('ADMIN')")
+    @PostAuthorize("@authz.check(#id)")
+    override suspend fun suspendingFlowPrePostAuthorizeBean(id: Boolean): Flow<Int> {
+        delay(1)
+        return flow {
+            for (i in 1..3) {
+                delay(1)
+                emit(i)
+            }
+        }
+    }
+
     @PreAuthorize("hasRole('ADMIN')")
     override fun flowPreAuthorize(): Flow<Int> {
         return flow {
@@ -104,4 +122,15 @@ class KotlinReactiveMessageServiceImpl(val delegate: KotlinReactiveMessageServic
     override fun flowPreAuthorizeDelegate(): Flow<Int> {
         return delegate.flowPreAuthorize()
     }
+
+    @PreAuthorize("hasRole('ADMIN')")
+    @PostAuthorize("@authz.check(#id)")
+    override fun flowPrePostAuthorize(id: Boolean): Flow<Int> {
+        return flow {
+            for (i in 1..3) {
+                delay(1)
+                emit(i)
+            }
+        }
+    }
 }

core/src/main/java/org/springframework/security/authorization/method/AuthorizationManagerAfterReactiveMethodInterceptor.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 the original author or authors.
+ * Copyright 2002-2023 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.
@@ -19,6 +19,7 @@ package org.springframework.security.authorization.method;
 import java.lang.reflect.Method;
 import java.util.function.Function;
 
+import kotlinx.coroutines.reactive.ReactiveFlowKt;
 import org.aopalliance.aop.Advice;
 import org.aopalliance.intercept.MethodInterceptor;
 import org.aopalliance.intercept.MethodInvocation;
@@ -29,6 +30,8 @@ import reactor.core.publisher.Mono;
 import org.springframework.aop.Pointcut;
 import org.springframework.aop.PointcutAdvisor;
 import org.springframework.aop.framework.AopInfrastructureBean;
+import org.springframework.core.KotlinDetector;
+import org.springframework.core.MethodParameter;
 import org.springframework.core.Ordered;
 import org.springframework.core.ReactiveAdapter;
 import org.springframework.core.ReactiveAdapterRegistry;
@@ -48,6 +51,10 @@ import org.springframework.util.Assert;
 public final class AuthorizationManagerAfterReactiveMethodInterceptor
 		implements Ordered, MethodInterceptor, PointcutAdvisor, AopInfrastructureBean {
 
+	private static final String COROUTINES_FLOW_CLASS_NAME = "kotlinx.coroutines.flow.Flow";
+
+	private static final int RETURN_TYPE_METHOD_PARAMETER_INDEX = -1;
+
 	private final Pointcut pointcut;
 
 	private final ReactiveAuthorizationManager<MethodInvocationResult> authorizationManager;
@@ -99,15 +106,32 @@ public final class AuthorizationManagerAfterReactiveMethodInterceptor
 	public Object invoke(MethodInvocation mi) throws Throwable {
 		Method method = mi.getMethod();
 		Class<?> type = method.getReturnType();
-		Assert
-			.state(Publisher.class.isAssignableFrom(type),
-					() -> String.format(
-							"The returnType %s on %s must return an instance of org.reactivestreams.Publisher "
-									+ "(for example, a Mono or Flux) in order to support Reactor Context",
-							type, method));
+		boolean isSuspendingFunction = KotlinDetector.isSuspendingFunction(method);
+		boolean hasFlowReturnType = COROUTINES_FLOW_CLASS_NAME
+			.equals(new MethodParameter(method, RETURN_TYPE_METHOD_PARAMETER_INDEX).getParameterType().getName());
+		boolean hasReactiveReturnType = Publisher.class.isAssignableFrom(type) || isSuspendingFunction
+				|| hasFlowReturnType;
+		Assert.state(hasReactiveReturnType,
+				() -> "The returnType " + type + " on " + method
+						+ " must return an instance of org.reactivestreams.Publisher "
+						+ "(for example, a Mono or Flux) or the function must be a Kotlin coroutine "
+						+ "in order to support Reactor Context");
 		Mono<Authentication> authentication = ReactiveAuthenticationUtils.getAuthentication();
 		Function<Object, Mono<?>> postAuthorize = (result) -> postAuthorize(authentication, mi, result);
 		ReactiveAdapter adapter = ReactiveAdapterRegistry.getSharedInstance().getAdapter(type);
+		if (hasFlowReturnType) {
+			if (isSuspendingFunction) {
+				Publisher<?> publisher = ReactiveMethodInvocationUtils.proceed(mi);
+				return Flux.from(publisher).flatMap(postAuthorize);
+			}
+			else {
+				Assert.state(adapter != null, () -> "The returnType " + type + " on " + method
+						+ " must have a org.springframework.core.ReactiveAdapter registered");
+				Flux<?> response = Flux.defer(() -> adapter.toPublisher(ReactiveMethodInvocationUtils.proceed(mi)))
+					.flatMap(postAuthorize);
+				return KotlinDelegate.asFlow(response);
+			}
+		}
 		Publisher<?> publisher = ReactiveMethodInvocationUtils.proceed(mi);
 		if (isMultiValue(type, adapter)) {
 			Flux<?> flux = Flux.from(publisher).flatMap(postAuthorize);
@@ -121,7 +145,7 @@ public final class AuthorizationManagerAfterReactiveMethodInterceptor
 		if (Flux.class.isAssignableFrom(returnType)) {
 			return true;
 		}
-		return adapter == null || adapter.isMultiValue();
+		return adapter != null && adapter.isMultiValue();
 	}
 
 	private Mono<?> postAuthorize(Mono<Authentication> authentication, MethodInvocation mi, Object result) {
@@ -153,4 +177,15 @@ public final class AuthorizationManagerAfterReactiveMethodInterceptor
 		this.order = order;
 	}
 
+	/**
+	 * Inner class to avoid a hard dependency on Kotlin at runtime.
+	 */
+	private static class KotlinDelegate {
+
+		private static Object asFlow(Publisher<?> publisher) {
+			return ReactiveFlowKt.asFlow(publisher);
+		}
+
+	}
+
 }

core/src/main/java/org/springframework/security/authorization/method/AuthorizationManagerBeforeReactiveMethodInterceptor.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 the original author or authors.
+ * Copyright 2002-2023 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.
@@ -18,6 +18,7 @@ package org.springframework.security.authorization.method;
 
 import java.lang.reflect.Method;
 
+import kotlinx.coroutines.reactive.ReactiveFlowKt;
 import org.aopalliance.aop.Advice;
 import org.aopalliance.intercept.MethodInterceptor;
 import org.aopalliance.intercept.MethodInvocation;
@@ -28,6 +29,8 @@ import reactor.core.publisher.Mono;
 import org.springframework.aop.Pointcut;
 import org.springframework.aop.PointcutAdvisor;
 import org.springframework.aop.framework.AopInfrastructureBean;
+import org.springframework.core.KotlinDetector;
+import org.springframework.core.MethodParameter;
 import org.springframework.core.Ordered;
 import org.springframework.core.ReactiveAdapter;
 import org.springframework.core.ReactiveAdapterRegistry;
@@ -48,6 +51,10 @@ import org.springframework.util.Assert;
 public final class AuthorizationManagerBeforeReactiveMethodInterceptor
 		implements Ordered, MethodInterceptor, PointcutAdvisor, AopInfrastructureBean {
 
+	private static final String COROUTINES_FLOW_CLASS_NAME = "kotlinx.coroutines.flow.Flow";
+
+	private static final int RETURN_TYPE_METHOD_PARAMETER_INDEX = -1;
+
 	private final Pointcut pointcut;
 
 	private final ReactiveAuthorizationManager<MethodInvocation> authorizationManager;
@@ -99,15 +106,31 @@ public final class AuthorizationManagerBeforeReactiveMethodInterceptor
 	public Object invoke(MethodInvocation mi) throws Throwable {
 		Method method = mi.getMethod();
 		Class<?> type = method.getReturnType();
-		Assert
-			.state(Publisher.class.isAssignableFrom(type),
-					() -> String.format(
-							"The returnType %s on %s must return an instance of org.reactivestreams.Publisher "
-									+ "(for example, a Mono or Flux) in order to support Reactor Context",
-							type, method));
+		boolean isSuspendingFunction = KotlinDetector.isSuspendingFunction(method);
+		boolean hasFlowReturnType = COROUTINES_FLOW_CLASS_NAME
+			.equals(new MethodParameter(method, RETURN_TYPE_METHOD_PARAMETER_INDEX).getParameterType().getName());
+		boolean hasReactiveReturnType = Publisher.class.isAssignableFrom(type) || isSuspendingFunction
+				|| hasFlowReturnType;
+		Assert.state(hasReactiveReturnType,
+				() -> "The returnType " + type + " on " + method
+						+ " must return an instance of org.reactivestreams.Publisher "
+						+ "(for example, a Mono or Flux) or the function must be a Kotlin coroutine "
+						+ "in order to support Reactor Context");
 		Mono<Authentication> authentication = ReactiveAuthenticationUtils.getAuthentication();
 		ReactiveAdapter adapter = ReactiveAdapterRegistry.getSharedInstance().getAdapter(type);
 		Mono<Void> preAuthorize = this.authorizationManager.verify(authentication, mi);
+		if (hasFlowReturnType) {
+			if (isSuspendingFunction) {
+				return preAuthorize.thenMany(Flux.defer(() -> ReactiveMethodInvocationUtils.proceed(mi)));
+			}
+			else {
+				Assert.state(adapter != null, () -> "The returnType " + type + " on " + method
+						+ " must have a org.springframework.core.ReactiveAdapter registered");
+				Flux<?> response = preAuthorize
+					.thenMany(Flux.defer(() -> adapter.toPublisher(ReactiveMethodInvocationUtils.proceed(mi))));
+				return KotlinDelegate.asFlow(response);
+			}
+		}
 		if (isMultiValue(type, adapter)) {
 			Publisher<?> publisher = Flux.defer(() -> ReactiveMethodInvocationUtils.proceed(mi));
 			Flux<?> result = preAuthorize.thenMany(publisher);
@@ -122,7 +145,7 @@ public final class AuthorizationManagerBeforeReactiveMethodInterceptor
 		if (Flux.class.isAssignableFrom(returnType)) {
 			return true;
 		}
-		return adapter == null || adapter.isMultiValue();
+		return adapter != null && adapter.isMultiValue();
 	}
 
 	@Override
@@ -149,4 +172,15 @@ public final class AuthorizationManagerBeforeReactiveMethodInterceptor
 		this.order = order;
 	}
 
+	/**
+	 * Inner class to avoid a hard dependency on Kotlin at runtime.
+	 */
+	private static class KotlinDelegate {
+
+		private static Object asFlow(Publisher<?> publisher) {
+			return ReactiveFlowKt.asFlow(publisher);
+		}
+
+	}
+
 }