java - Spring WebFlux: set max file(s) size for uploading files

Question

I'm using flux of FileParts to upload files @RequestPart(FILES) Flux<FilePart> files

And trying to limit maximum size of files. Looks like old way does not work:

spring.servlet.multipart.max-file-size=1MB
spring.servlet.multipart.max-request-size=1MB

And I dont have any methods to get file size in FilePart interface. So is ther any way to limit max size of uploaded file in webflux, whithout copying it? I know that there are headers like Content-Length, but it does not look secure way.

Answer 1

The Web on Reactive Stack documentation states the following:

For file parts written to disk, there is an additional maxDiskUsagePerPart property to limit the amount of disk space per part. There is also a maxParts property to limit the overall number of parts in a multipart request. To configure all 3 in WebFlux, you’ll need to supply a pre-configured instance of MultipartHttpMessageReader to ServerCodecConfigurer.

I was able to apply it via this configuration class:

@Configuration
@EnableWebFlux
public class WebConfig implements WebFluxConfigurer {

    @Override
    public void configureHttpMessageCodecs(ServerCodecConfigurer configurer) {
        SynchronossPartHttpMessageReader partReader = new SynchronossPartHttpMessageReader();
        partReader.setMaxParts(1);
        partReader.setMaxDiskUsagePerPart(10L * 1024L);
        partReader.setEnableLoggingRequestDetails(true);

        MultipartHttpMessageReader multipartReader = new MultipartHttpMessageReader(partReader);
        multipartReader.setEnableLoggingRequestDetails(true);

        configurer.defaultCodecs().multipartReader(multipartReader);
    }

}