倾销不良要求 [英] Dumping bad requests

问题描述

我有一个用Dropwizard实现的服务，我需要将不正确的请求转储到某个地方.

I have a service implemented with Dropwizard and I need to dump incorrect requests somewhere.

我看到有一个可能性可以自定义通过注册ExceptionMapper<JerseyViolationException>来显示错误消息.但是我需要完整的请求(标​​题，正文)，而不仅是ConstraintViolations.

I saw that there is a possibility to customise the error message by registering ExceptionMapper<JerseyViolationException>. But I need to have the complete request (headers, body) and not only ConstraintViolations.

推荐答案

您可以注入

You can inject ContainerRequest into the ExceptionMapper. You need to inject it as a javax.inject.Provider though, so that you can lazily retrieve it. Otherwise you will run into scoping problems.

@Provider
public class Mapper implements ExceptionMapper<ConstraintViolationException> {

    @Inject
    private javax.inject.Provider<ContainerRequest> requestProvider;

    @Override
    public Response toResponse(ConstraintViolationException ex) {
        ContainerRequest request = requestProvider.get();
    }
}

在ContainerRequest中，您可以使用getHeaderString()或getHeaders()获得标头.如果要获取主体，则需要做一些改动，因为在到达映射器时，Jersey已经读取了实体流.因此，我们需要实现ContainerRequestFilter来缓冲实体.

In the ContainerRequest, you can get headers with getHeaderString() or getHeaders(). If you want to get the body, you need to do a little hack because the entity stream is already read by Jersey by the time the mapper is reached. So we need to implement a ContainerRequestFilter to buffer the entity.

public class EntityBufferingFilter implements ContainerRequestFilter {

    @Override
    public void filter(ContainerRequestContext containerRequestContext) throws IOException {
        ContainerRequest request = (ContainerRequest) containerRequestContext;
        request.bufferEntity();
    }
}

您可能不希望针对所有请求调用此过滤器(出于性能原因)，因此您可能希望使用

You might not want this filter to be called for all requests (for performance reasons), so you might want to use a DynamicFeature to register the filter just on methods that use bean validation (or use Name Binding).

一旦注册了此过滤器，就可以使用ContainerRequest#readEntity(Class)读取正文.您可以像在客户端使用Response#readEntity()一样使用此方法.因此，对于该类，如果要保持其通用性，可以使用String.class或InputStream.class并将InputStream转换为字符串.

Once you have this filter registered, you can read the body using ContainerRequest#readEntity(Class). You use this method just like you would on the client side with Response#readEntity(). So for the class, if you want to keep it generic, you can use String.class or InputStream.class and convert the InputStream to a String.

ContainerRequest request = requestProvider.get();
String body = request.readEntity(String.class);

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