companion object {
    @Bean
    fun roleHierarchy(): RoleHierarchy {
        return RoleHierarchyImpl.fromHierarchy("ROLE_ADMIN > permission:read")
    }
}

<bean id="roleHierarchy"
        class="org.springframework.security.access.hierarchicalroles.RoleHierarchyImpl" factory-method="fromHierarchy">
    <constructor-arg value="ROLE_ADMIN > permission:read"/>
</bean>

@PreAuthorize("hasAuthority('permission:read')")

@Component
open class BankService {
	@PreAuthorize("hasRole('ADMIN')")
	fun readAccount(val id: Long): Account {
        // ... is only invoked if the `Authentication` has the `ROLE_ADMIN` authority
	}
}

@WithMockUser(roles="ADMIN")
@Test
fun readAccountWithAdminRoleThenInvokes() {
    val account: Account = this.bankService.readAccount("12345678")
    // ... assertions
}

@WithMockUser(roles="WRONG")
@Test
fun readAccountWithWrongRoleThenAccessDenied() {
    assertThatExceptionOfType(AccessDeniedException::class.java).isThrownBy {
        this.bankService.readAccount("12345678")
    }
}

@Component
open class BankService {
	@PostAuthorize("returnObject.owner == authentication.name")
	fun readAccount(val id: Long): Account {
        // ... is only returned if the `Account` belongs to the logged in user
	}
}

@WithMockUser(username="owner")
@Test
fun readAccountWhenOwnedThenReturns() {
    val account: Account = this.bankService.readAccount("12345678")
    // ... assertions
}

@WithMockUser(username="wrong")
@Test
fun readAccountWhenNotOwnedThenAccessDenied() {
    assertThatExceptionOfType(AccessDeniedException::class.java).isThrownBy {
        this.bankService.readAccount("12345678")
    }
}

@Target(ElementType.METHOD, ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
@PostAuthorize("returnObject.owner == authentication.name")
annotation class RequireOwnership

@Component
open class BankService {
	@RequireOwnership
	fun readAccount(val id: Long): Account {
        // ... is only returned if the `Account` belongs to the logged in user
	}
}

@Component
open class BankService {
	@PreFilter("filterObject.owner == authentication.name")
	fun updateAccounts(vararg accounts: Account): Collection<Account> {
        // ... `accounts` will only contain the accounts owned by the logged-in user
        return updated
	}
}

@Autowired
lateinit var bankService: BankService

@WithMockUser(username="owner")
@Test
fun updateAccountsWhenOwnedThenReturns() {
    val ownedBy: Account = ...
    val notOwnedBy: Account = ...
    val updated: Collection<Account> = bankService.updateAccounts(ownedBy, notOwnedBy)
    assertThat(updated).containsOnly(ownedBy)
}

@PreFilter("filterObject.owner == authentication.name")
fun updateAccounts(accounts: Array<Account>): Collection<Account>

@PreFilter("filterObject.owner == authentication.name")
fun updateAccounts(accounts: Collection<Account>): Collection<Account>

@PreFilter("filterObject.value.owner == authentication.name")
fun updateAccounts(accounts: Map<String, Account>): Collection<Account>

@PreFilter("filterObject.owner == authentication.name")
fun updateAccounts(accounts: Stream<Account>): Collection<Account>

@Component
open class BankService {
	@PreFilter("filterObject.owner == authentication.name")
	fun readAccounts(vararg ids: String): Collection<Account> {
        // ... the return value will be filtered to only contain the accounts owned by the logged-in user
        return accounts
	}
}

@Autowired
lateinit var bankService: BankService

@WithMockUser(username="owner")
@Test
fun readAccountsWhenOwnedThenReturns() {
    val accounts: Collection<Account> = bankService.updateAccounts("owner", "not-owner")
    assertThat(accounts).hasSize(1)
    assertThat(accounts[0].owner).isEqualTo("owner")
}

@PostFilter("filterObject.owner == authentication.name")
fun readAccounts(vararg ids: String): Collection<Account>

@PostFilter("filterObject.owner == authentication.name")
fun readAccounts(vararg ids: String): Array<Account>

@PostFilter("filterObject.owner == authentication.name")
fun readAccounts(vararg ids: String): Map<String, Account>

@PostFilter("filterObject.owner == authentication.name")
fun readAccounts(vararg ids: String): Stream<Account>

@EnableMethodSecurity(securedEnabled = true)

<sec:method-security secured-enabled="true"/>

@EnableMethodSecurity(jsr250Enabled = true)

<sec:method-security jsr250-enabled="true"/>

@Controller
@PreAuthorize("hasAuthority('ROLE_USER')")
open class MyController {
    @GetMapping("/endpoint")
    fun endpoint(): String { ... }
}

@Controller
@PreAuthorize("hasAuthority('ROLE_USER')")
open class MyController {
    @GetMapping("/endpoint")
    @PreAuthorize("hasAuthority('ROLE_ADMIN')")
    fun endpoint(): String { ... }
}

@Target(ElementType.METHOD, ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
@PreAuthorize("hasRole('ADMIN')")
annotation class IsAdmin

@Component
open class BankService {
	@IsAdmin
	fun readAccount(val id: Long): Account {
        // ... is only returned if the `Account` belongs to the logged in user
	}
}

@Configuration
@EnableMethodSecurity(prePostEnabled = false)
class MethodSecurityConfig {
	@Bean
	@Role(BeanDefinition.ROLE_INFRASTRUCTURE)
	fun postAuthorize() : Advisor {
		return AuthorizationManagerAfterMethodInterceptor.postAuthorize()
	}
}

<sec:method-security pre-post-enabled="false"/>

<aop:config/>

<bean id="postAuthorize"
	class="org.springframework.security.authorization.method.AuthorizationManagerBeforeMethodInterceptor"
	factory-method="postAuthorize"/>

@Component("authz")
open class AuthorizationLogic {
    fun decide(val operations: MethodSecurityExpressionOperations): boolean {
        // ... authorization logic
    }
}

@Controller
open class MyController {
    @PreAuthorize("@authz.decide(#root)")
    @GetMapping("/endpoint")
    fun String endpoint() {
        // ...
    }
}

@Component("authz")
open class AuthorizationLogic {
    fun decide(val operations: MethodSecurityExpressionOperations): AuthorizationDecision {
        // ... authorization logic
        return MyAuthorizationDecision(false, details)
    }
}

@Component
class MyAuthorizationManager : AuthorizationManager<MethodInvocation>, AuthorizationManager<MethodInvocationResult> {
    override fun check(authentication: Supplier<Authentication>, invocation: MethodInvocation): AuthorizationDecision {
        // ... authorization logic
    }

    override fun check(authentication: Supplier<Authentication>, invocation: MethodInvocationResult): AuthorizationDecision {
        // ... authorization logic
    }
}

@Configuration
@EnableMethodSecurity(prePostEnabled = false)
class MethodSecurityConfig {
   	@Bean
	@Role(BeanDefinition.ROLE_INFRASTRUCTURE)
	fun preAuthorize(val manager: MyAuthorizationManager) : Advisor {
		return AuthorizationManagerBeforeMethodInterceptor.preAuthorize(manager)
	}

	@Bean
	@Role(BeanDefinition.ROLE_INFRASTRUCTURE)
	fun postAuthorize(val manager: MyAuthorizationManager) : Advisor {
		return AuthorizationManagerAfterMethodInterceptor.postAuthorize(manager)
	}
}

<sec:method-security pre-post-enabled="false"/>

<aop:config/>

<bean id="preAuthorize"
	class="org.springframework.security.authorization.method.AuthorizationManagerBeforeMethodInterceptor"
	factory-method="preAuthorize">
    <constructor-arg ref="myAuthorizationManager"/>
</bean>

<bean id="postAuthorize"
	class="org.springframework.security.authorization.method.AuthorizationManagerAfterMethodInterceptor"
	factory-method="postAuthorize">
    <constructor-arg ref="myAuthorizationManager"/>
</bean>

companion object {
	@Bean
	fun methodSecurityExpressionHandler(val roleHierarchy: RoleHierarchy) : MethodSecurityExpressionHandler {
		val handler = DefaultMethodSecurityExpressionHandler()
		handler.setRoleHierarchy(roleHierarchy)
		return handler
	}
}

<sec:method-security>
	<sec:expression-handler ref="myExpressionHandler"/>
</sec:method-security>

<bean id="myExpressionHandler"
		class="org.springframework.security.messaging.access.expression.DefaultMessageSecurityExpressionHandler">
	<property name="roleHierarchy" ref="roleHierarchy"/>
</bean>

@Service
class AccountService { (1)

    @PreAuthorize("@authz.decide()") (2)
    @AuthorizeReturnObject (3)
    fun getAccountById(accountId: String): Account {
        // ...
    }

}

class Account(private val accountNumber: String) {

    @PreAuthorize("@accountAuthz.canViewAccountNumber()") (4)
    fun getAccountNumber(): String {
        return this.accountNumber
    }

    @AuthorizeReturnObject (5)
    fun getUser(): User {
        return User("John Doe")
    }

}

class User(private val fullName: String) {

    @PostAuthorize("@myOtherAuthz.decide()") (6)
    fun getFullName(): String {
        return this.fullName
    }

}

@Service
class AccountService {

    @AuthorizeReturnObject
    fun getAllAccounts(): List<Account> {
        // ...
    }

}

@Bean
@Role(BeanDefinition.ROLE_INFRASTRUCTURE)
fun registerTheseToo(): SecurityHintsRegistrar {
    return PrePostAuthorizeExpressionBeanHintsRegistrar(Account::class.java)
}

import static org.springframework.security.authorization.AuthorityAuthorizationManager.hasRole

companion object {
    @Bean
    @Role(BeanDefinition.ROLE_INFRASTRUCTURE)
    fun protectServicePointcut(): Advisor {
        val pattern = AspectJExpressionPointcut()
        pattern.setExpression("execution(* com.mycompany.*Service.*(..))")
        return new AuthorizationManagerBeforeMethodInterceptor(pattern, hasRole("USER"))
    }
}

<sec:method-security>
    <protect-pointcut expression="execution(* com.mycompany.*Service.*(..))" access="hasRole('USER')"/>
</sec:method-security>

@EnableMethodSecurity(mode=AdviceMode.ASPECTJ)

<sec:method-security mode="aspectj"/>

@Component
open class MyService {
    @PreAuthorize("denyAll") (1)
    fun myDeprecatedMethod(...): MyResource

    @PreAuthorize("hasRole('ADMIN')") (2)
    fun writeResource(...): MyResource

    @PreAuthorize("hasAuthority('db') and hasRole('ADMIN')") (3)
    fun deleteResource(...): MyResource

    @PreAuthorize("principal.claims['aud'] == 'my-audience'") (4)
    fun readResource(...): MyResource

    @PreAuthorize("@authz.check(#root)")
    fun shareResource(...): MyResource
}

<sec:method-security>
    <protect-pointcut expression="execution(* com.mycompany.*Service.myDeprecatedMethod(..))" access="denyAll"/> (1)
    <protect-pointcut expression="execution(* com.mycompany.*Service.writeResource(..))" access="hasRole('ADMIN')"/> (2)
    <protect-pointcut expression="execution(* com.mycompany.*Service.deleteResource(..))" access="hasAuthority('db') and hasRole('ADMIN')"/> (3)
    <protect-pointcut expression="execution(* com.mycompany.*Service.readResource(..))" access="principal.claims['aud'] == 'my-audience'"/> (4)
    <protect-pointcut expression="execution(* com.mycompany.*Service.shareResource(..))" access="@authz.check(#root)"/> (5)
</sec:method-security>

@Bean
open fun skipValueTypes() = Customizer<AuthorizationAdvisorProxyFactory> {
    it.setTargetVisitor(TargetVisitor.defaultsSkipValueTypes())
}

@Autowired
var proxyFactory:AuthorizationProxyFactory? = null

@Test
fun getEmailWhenProxiedThenAuthorizes() {
    val user: User = User("name", "email")
    assertThat(user.getEmail()).isNotNull()
    val securedUser: User = proxyFactory.proxy(user)
    assertThatExceptionOfType(AccessDeniedException::class.java).isThrownBy(securedUser::getEmail)
}

import org.springframework.security.authorization.method.AuthorizationAdvisorProxyFactory.TargetVisitor;
import org.springframework.security.authorization.method.AuthorizationManagerBeforeMethodInterceptor.preAuthorize

// ...

val proxyFactory: AuthorizationProxyFactory = AuthorizationProxyFactory(preAuthorize())
// and if needing to skip value types
proxyFactory.setTargetVisitor(TargetVisitor.defaultsSkipValueTypes())

@Test
fun getEmailWhenProxiedThenAuthorizes() {
    val proxyFactory: AuthorizationProxyFactory = AuthorizationAdvisorProxyFactory.withDefaults()
    val user: User = User("name", "email")
    assertThat(user.getEmail()).isNotNull()
    val securedUser: User = proxyFactory.proxy(user)
    assertThatExceptionOfType(AccessDeniedException::class.java).isThrownBy(securedUser::getEmail)
}

@EnableMethodSecurity
internal class SecurityConfig {
    @Bean
    fun myAuthorizationAdvisor(): AuthorizationAdvisor {
        return AuthorizationAdvisor()
    }
]

@RestController
class UserController  {
    @Autowired
    var proxyFactory: AuthorizationProxyFactory? = null

    @GetMapping
    fun currentUser(@AuthenticationPrincipal user:User?): User {
        return proxyFactory.proxy(user)
    }
}

@Component
class Null : MethodAuthorizationDeniedHandler {
    override fun handleDeniedInvocation(methodInvocation: MethodInvocation?, authorizationResult: AuthorizationResult?): Any? {
        return null
    }
}

// ...

@HandleAuthorizationDenied(handlerClass = Null.class)
open class User {
	...
}

@SpringBootApplication
open class MyApplication {
	@RestController
    open class MyController { (1)
		@GetMapping
        @AuthorizeReturnObject
        fun getMessage():Message { (2)
			return Message(someUser, "hello!")
        }
    }

	open class Message { (3)
		val to: User
		val test: String

		// ...

        @AuthorizeReturnObject
        fun getTo(): User { (4)
			return this.to
        }

		// ...
	}

	open class User { (5)
		// ...
	}

	fun main(args: Array<String>) {
		SpringApplication.run(MyApplication.class)
	}
}

@RestController
static class MyController {
    @AuthorizeReturnObject
    @GetMapping
    fun getMessages(): Array<Message> = arrayOf(Message(someUser, "hello!"))
}

@Bean
@Role(BeanDefinition.ROLE_INFRASTRUCTURE)
fun registerTheseToo(proxyFactory: AuthorizationProxyFactory?): SecurityHintsRegistrar {
    return AuthorizeReturnObjectHintsRegistrar(proxyFactory, Message::class.java)
}

class EmailMaskingMethodAuthorizationDeniedHandler : MethodAuthorizationDeniedHandler {

    override fun handleDeniedInvocation(methodInvocation: MethodInvocation, authorizationResult: AuthorizationResult): Any {
        return "***"
    }

    override fun handleDeniedInvocationResult(methodInvocationResult: MethodInvocationResult, authorizationResult: AuthorizationResult): Any {
        val email = methodInvocationResult.result as String
        return email.replace("(^[^@]{3}|(?!^)\\G)[^@]".toRegex(), "$1*")
    }

}

@Configuration
@EnableMethodSecurity
class SecurityConfig {

    @Bean
    fun emailMaskingMethodAuthorizationDeniedHandler(): EmailMaskingMethodAuthorizationDeniedHandler {
        return EmailMaskingMethodAuthorizationDeniedHandler()
    }

}

class User (val name:String, @PostAuthorize(value = "hasAuthority('user:read')") @HandleAuthorizationDenied(handlerClass = EmailMaskingMethodAuthorizationDeniedHandler::class) val email:String) (3)

@Autowired
var users:UserRepository? = null

@Test
fun getEmailWhenProxiedThenMaskedEmail() {
    val securedUser: Optional<User> = users.findByName("name")
    // email is [email protected]
    assertThat(securedUser.get().getEmail()).isEqualTo("use******@example.com")
}

import org.springframework.core.annotation.AnnotationUtils

@Target(AnnotationTarget.FUNCTION, AnnotationTarget.CLASS)
@Retention(AnnotationRetention.RUNTIME)
annotation class Mask(val value: String)

class MaskAnnotationDeniedHandler : MethodAuthorizationDeniedHandler {

    override fun handleDeniedInvocation(methodInvocation: MethodInvocation, authorizationResult: AuthorizationResult): Any {
        val mask = AnnotationUtils.getAnnotation(methodInvocation.method, Mask::class.java)
        return mask.value
    }

}

@Configuration
@EnableMethodSecurity
class SecurityConfig {

    @Bean
    fun maskAnnotationDeniedHandler(): MaskAnnotationDeniedHandler {
        return MaskAnnotationDeniedHandler()
    }

}

@Component
class MyService {

    @PreAuthorize(value = "hasAuthority('user:read')")
    @HandleAuthorizationDenied(handlerClass = MaskAnnotationDeniedHandler::class)
    @Mask("***")
    fun foo(): String {
        return "foo"
    }

    @PreAuthorize(value = "hasAuthority('user:read')")
    @HandleAuthorizationDenied(handlerClass = MaskAnnotationDeniedHandler::class)
    @Mask("???")
    fun bar(): String {
        return "bar"
    }

}

@Autowired
var myService: MyService

@Test
fun fooWhenDeniedThenReturnStars() {
    val value: String = myService.foo()
    assertThat(value).isEqualTo("***")
}

@Test
fun barWhenDeniedThenReturnQuestionMarks() {
    val value: String = myService.foo()
    assertThat(value).isEqualTo("???")
}

@Target(AnnotationTarget.FUNCTION, AnnotationTarget.CLASS)
@Retention(AnnotationRetention.RUNTIME)
@HandleAuthorizationDenied(handlerClass = MaskAnnotationDeniedHandler::class)
annotation class Mask(val value: String)

@Mask("***")
fun myMethod(): String {
    // ...
}

@EnableGlobalMethodSecurity(prePostEnabled = true)

<global-method-security pre-post-enabled="true"/>

@EnableMethodSecurity

<method-security/>

@EnableGlobalMethodSecurity(securedEnabled = true)

<global-method-security secured-enabled="true"/>

@EnableMethodSecurity(securedEnabled = true, prePostEnabled = false)

<method-security secured-enabled="true" pre-post-enabled="false"/>

class MyAuthorizer {
	fun isAdmin(val root: MethodSecurityExpressionOperations): boolean {
		val decision = root.hasAuthority("ADMIN");
		// custom work ...
        return decision;
	}
}

@PreAuthorize("@authz.isAdmin(#root)")