How to get the WRO4J generated content from a servet?

[Tekno]

Hi,

I'd like to get the content of the generated WRO4J from a java servlet.

I need this because I want to calculate the hash of the content, and then distribute the file via an url: /hashed/$HASH/wro/style.css

The servlet that listens on /hashed/* gets the content from the original URL using a RequestDispatcher. Something like this:

        RequestDispatcher dispatcher = context.getRequestDispatcher(plainUri);

        ByteArrayResponseWrapper responseWrapper = new ByteArrayResponseWrapper(resp);

        dispatcher.include(req, responseWrapper);

        byte[] bytes = responseWrapper.getBytes();

        String hash = SHA1Digest.toSHA1(bytes);

     // if the calculated hash is the same as in the request uri then:

        resp.getWriter().println(SHA1Digest.toSHA1(bytes));

        resp.addHeader("Cache-Control", "max-age=" + SECONDS_IN_A_YEAR + ", public");

        resp.addHeader("ETAG", hash);

    

 ....

(ByteArrayResponseWrapper is a custom class that gets the written content of the response accumulated into a byte array.)

This works for any static resources and also for servlet generated resources, but does not work for WRO4j as it creates the content using a filter.

How to get around this issue?

The problem is related to this issue: https://code.google.com/p/wro4j/issues/detail?id=360

And it's pretty much the same issue described at http://stackoverflow.com/questions/19422960/jetty-concatservlet-to-handle-filter-generated-content

(I posted that myself, it's a different problem but both problems are caused by the same issue.)

Thanks,

T.

[Alex Objelean]

I think the reason why it doesn't work with wro filter is because you are missing the following filter-mapping configuration:

  <filter-mapping>
    <filter-name>WebResourceOptimizer</filter-name>
    <url-pattern>/wro/*</url-pattern>

    <dispatcher>REQUEST</dispatcher>
    <dispatcher>INCLUDE</dispatcher>
    <dispatcher>FORWARD</dispatcher>

  </filter-mapping>


Let me know if that works.


Thanks,
Alex

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