Allow ordering of exception handlers

Adds `@Order` to the security access exception handler which allows
user-defined exception handlers to be ordered around the access
exception handler.

Closes #371

Signed-off-by: Thomas Skjølberg <thomas.skjolberg@gmail.com>

Author: skjolber

spring-grpc-core/src/main/java/org/springframework/grpc/server/security/SecurityGrpcExceptionHandler.java

@@ -20,17 +20,24 @@
 import org.apache.commons.logging.LogFactory;
 import org.jspecify.annotations.Nullable;
 
+import org.springframework.core.Ordered;
 import org.springframework.grpc.server.exception.GrpcExceptionHandler;
 import org.springframework.security.access.AccessDeniedException;
 import org.springframework.security.core.AuthenticationException;
 
 import io.grpc.Status;
 import io.grpc.StatusException;
 
-public class SecurityGrpcExceptionHandler implements GrpcExceptionHandler {
+public class SecurityGrpcExceptionHandler implements GrpcExceptionHandler, Ordered {
 
 	private static final Log logger = LogFactory.getLog(SecurityGrpcExceptionHandler.class);
 
+	private final int order;
+
+	public SecurityGrpcExceptionHandler(int order) {
+		this.order = order;
+	}
+
 	@Override
 	public @Nullable StatusException handleException(Throwable exception) {
 		if (exception instanceof AuthenticationException) {
@@ -48,4 +55,9 @@ public class SecurityGrpcExceptionHandler implements GrpcExceptionHandler {
 		return null;
 	}
 
+	@Override
+	public int getOrder() {
+		return this.order;
+	}
+
 }

spring-grpc-server-spring-boot-autoconfigure/src/main/java/org/springframework/boot/grpc/server/autoconfigure/security/GrpcSecurityAutoConfiguration.java

@@ -72,7 +72,7 @@ static class ExceptionHandlerConfiguration {
 
 		@Bean
 		GrpcExceptionHandler accessExceptionHandler() {
-			return new SecurityGrpcExceptionHandler();
+			return new SecurityGrpcExceptionHandler(0);
 		}
 
 	}