Question

I have a an object that I d like to grab the contents of in java. The only problem is that is is currently in ruby.

irb(main):050:0> blah
=> "BAh7ByIeYXV0aGVudGljYXRpb25fc3RyYXRlZ2llczAiCXVzZXJpBg%253D%253D-
-0cdecf4edfaa5cbe4693c9fb83b204c1256a54a6"

irb(main):049:0> Marshal.load(Base64.decode64(blah))
=> {"authentication_strategies"=>nil, "user"=>1}

I got the base64 portion allright -- so now everything is in bytes. How would i access that 2nd string? I presume something can be done with jruby but I ve never used it before and would have no clue where to start.

let me elaborate on my problem here.

1) these are cookies that I m trying to share between a servlet on tomcat and a merb app on apache

2) I am not going to be storing them in the database. I have thought about using them in memcached but for other reasons I d like to store them as cookies (yes I m well aware of the security implications involved)

I am currently looking at jruby s Red Bridge/jruby-embed, however since this is only like 70 bytes I need to look at I think it s ridiculous to call up all that overhead for something so simple.

rather than start up a new question.... code I have right now looks like so:

        // using commons
        Base64 b64 = new Base64();
        byte[] decoded = b64.decode(cookie.getValue().getBytes());

        ScriptingContainer container = new ScriptingContainer();
        container.runScriptlet("la = Marshal.load("" + decoded + ""); puts la.to_s;");

obviously this isn t going to work cause marshal is going to check the first 2 bytes of decoded and freak out since it doesn t match jruby s major/minor version....hrmss..

Answer 1

Ok! This is what I did. Let me re-iterate my whole purpose here was to get a cookie session from merb to a servlet running under tomcat.

import java.io.*;
import java.util.*;
import org.jruby.embed.ScriptingContainer;
import org.apache.commons.codec.binary.Base64;
import javax.servlet.*;
import javax.servlet.http.*;

public class process extends HttpServlet {

  public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
   HttpSession session = request.getSession(true);

    PrintWriter out = response.getWriter();
    Cookie[] cookies = request.getCookies();

    for(int i=0; i<cookies.length; i++) {
      Cookie cookie = cookies[i];

      // base64 decode, then un-marshall ruby style...
      // finally figure out what to do with our session secret key
      if(cookie.getName().equals("_session_id")) {
        ScriptingContainer container = new ScriptingContainer();
        container.setWriter(out);
        container.runScriptlet("require  base64 ; puts "" + cookie.getValue() + ""; " +
                              "puts Marshal.load(Base64.decode64("" + cookie.getValue() + "")).to_s; ");
      }                       

    } 

}     
}

Obviously this code can be cleaned up quite a lot -- eg: moving the base64 decoding back to java -- but this will get a cookie from merb. Now I just need to throw the validator in there to make sure this isn t forged.

Thanks for your suggestions everyone!

Answer 2

For a solution not involving JRuby, Why don t you serialize the fields you are interested in yourself? For example, saving them as raw strings into a file or to a relational database?

I realize that this may not exactly answer the question but it may be a possibility that you hadn t previously thought of!

EDIT - feydr has made it clear that he was not talking about serializing object data to a file. I presume therefore that the serialization is for inter-process communication, in which case a binary protocol (or any protocol really) delivered via sockets isa good solution and easy to implement. You could do worse than to have a look at Google protocol buffers (it can even do code generation on the Java side).

Answer 3

You may also consider using Google protocol buffers which are available for Ruby and Java (as well as C++ and Python).

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