What is the proper replacement of the Resteasy 3.X PreProcessInterceptor?

问题

I'm building rest service using an authentication/authorization mechanism as described in this tutorial: http://howtodoinjava.com/2013/06/26/jax-rs-resteasy-basic-authentication-and-authorization-tutorial/

Basically it uses the PreProcessInterceptor interface to scan the target method for annotations (from javax.annotation.security package) which describe the required roles to access that method. As the the authenticator here is an interceptor, it can cancel the target method invocation, returning a 401 (unauthorized) if needed.

The problem here is that the interface org.jboss.resteasy.spi.interception.PreProcessInterceptor is deprecated in the current RestEasy version (3.0.1), and I'm having problems trying to implement the same behaviour with the standard JAX-RS interfaces.

I'm using the javax.ws.rs.ext.ReaderInterceptor interface to intercept the call. But somehow the server never calls it: the interceptor is just ignored.

I'm registering the interceptors/resources the same way as I did with the former PreProcessInterceptor, and using the same @Provider and @ServerInterceptor annotations:

ServerApplication:

public class ServerApplication extends javax.ws.rs.core.Application {

     private final HashSet<Object> singletons = new LinkedHashSet<Object>();

     public ServerApplication() {
         singletons.add(new SecurityInterceptor());
         singletons.add( ... ); //add each of my rest resources
     }

    @Override
    public Set<Class<?>> getClasses() {
        HashSet<Class<?>> set = new HashSet<Class<?>>();
        return set;
    }

    @Override
    public Set<Object> getSingletons() {
        return singletons;
    }
}

SecurityInterceptor:

@Provider
@ServerInterceptor
public class SecurityInterceptor implements javax.ws.rs.ext.ReaderInterceptor {
     @Override
     public Object aroundReadFrom(ReaderInterceptorContext context){
            //code that is never called... so lonely here...
     }
}

Any insights about how can I solve this problem?

Thank you.

回答1:

RESTEasy 3.x.x conforms to the JAX-RS 2.0 specification.

What you are trying to do could be accomplished (maybe better) with:

@Provider
public class SecurityInterceptor 
      implements javax.ws.rs.container.ContainerRequestFilter {
     @Override
     public void filter(ContainerRequestContext requestContext){
       if (not_authenticated){ requestContext.abortWith(response)};
     }
}

since the ReaderInterceptor is invoked only if the underlying MessageBodyReader.readFrom is called by the standard JAX-RS pipeline, not fromthe application code.

The reason why your interceptor is not called, though, could be the @ServerInterceptor annotation, which is a RESTEasy extension.

The spec states at §6.5.2 that a interceptor is globally registered, unless the @Provider is annotated with a @NameBinding annotation, but I don't know if RESTEasy can handle a @ServerInterceptor if it's not explicitly registered as shown in RestEASY Interceptor Not Being Called

回答2:

If you need to get access to the underlying java.lang.reflect.Method (like you used to be able to get by implementing AcceptedByMethod), you can do the following:

ResourceMethodInvoker methodInvoker = (ResourceMethodInvoker) 
            requestContext.getProperty("org.jboss.resteasy.core.ResourceMethodInvoker");
Method method = methodInvoker.getMethod();

回答3:

I also wanted to get access to the underlying java.lang.reflect.Method and tried mtpettyp's answer with Resteasy 3.0.8, but that was returning null on the getProperty call. I am also using Spring and resteasy-spring although I don't believe that should impact this at all.

If you run into my situation and are implementing a Post Matching ContainerRequestFilter (you kind of have to if you were expecting to get the matched resource method anyway) then you can actually cast the ContainerRequestContext to the implementation Resteasy has for the Post Match scenario. The PostMatchContainerRequestContext has a reference to the ResourceMethodInvoker.

public void filter(ContainerRequestContext context) throws IOException {
    PostMatchContainerRequestContext pmContext = (PostMatchContainerRequestContext) context;

    Method method = pmContext.getResourceMethod().getMethod();

    /* rest of code here */
}

来源：https://stackoverflow.com/questions/17594910/what-is-the-proper-replacement-of-the-resteasy-3-x-preprocessinterceptor

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