Package com.vaadin.flow.server.streams

Interface UploadHeaderCallback

All Superinterfaces:

Serializable

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
public interface UploadHeaderCallback
extends Serializable

Callback for validating the leading bytes of an upload, used with AbstractUploadHandler.validateHeader(int, UploadHeaderCallback).

Call UploadEvent.reject(String) to refuse the upload. See UploadValidator.validateHeader(UploadEvent, ByteBuffer) for the phase semantics.

Method Summary

Modifier and Type	Method	Description
void	validate(UploadEvent event, ByteBuffer header)	Validates the header (leading bytes) of an upload, rejecting it via UploadEvent.reject(String) if it must not be stored.

Method Details

validate

void validate(UploadEvent event,
 ByteBuffer header)
       throws IOException

Validates the header (leading bytes) of an upload, rejecting it via UploadEvent.reject(String) if it must not be stored.

Parameters:

event - the current upload

header - a read-only view of the leading bytes of the upload, up to the requested size (fewer if the upload is smaller); only valid for the duration of the call

Throws:

IOException - if validation fails; treated as a transfer error