Controlling Java with JavaScript

I am facing a challenge with a complex, generated Javascript file (it is created by the GWT compiler) that requires programmatically making changes to and outputting a modified version of the file. The specific section in question contains:

function bookmark(){
    // lots-o-javascript
    var M=Vb+s+I+Wb;n.write(Xb+Yb+Zb+$b+_b+ac+bc+$b+_b+cc+dc+ec+M+fc+gc+hc+ic)
}
bookmark();

The unobfuscated content inside the function reads as follows:

var compiledScriptTag = '"<script src=\\"' + base + strongName + '.cache.js\\"><\/scr" + "ipt>"';
$doc_0.write('<scr' + 'ipt><!-' + '-\n' + 'blah blah blah' + 'document.write(' + compiledScriptTag + ');' + '\n-' + '-><\/scr' + 'ipt>');

My goal is to transform the above two lines within a Java servlet into the equivalent of:

eval('blah blah blah');
document.body.appendChild(document.createElement('script')).src=base + strongName + ".cache.js";

I am seeking advice on the best approach to parse and restructure this Javascript file. Would utilizing Rhino be a viable option for handling these changes and nested Javascript content being written using $doc.write? Any suggestions or insights would be greatly welcomed.

javajavascriptgwtserverside-javascript

Answer №1

One alternative approach could involve refining the iframe linker to make specific adjustments, or potentially developing a separate linker to modify the necessary lines prior to obfuscation by the loader. Although I have not extensively experimented with linkers, they seem to be an ideal location for achieving your desired customization.

Answer №2

If you want to obtain unobfuscated JavaScript from the GWT compiler, try adding the -style PRETTY option.

When using Rhino to run your JavaScript code, make sure to include browser-specific objects like document and window. However, dealing with document.write can introduce complexity.

An alternative approach is to utilize ANTLRv3 along with the provided ECMAScript grammar for parsing JavaScript. It's uncertain whether this method will be beneficial in your case.

Answer №3

Given the unique nature of the required transformation, it seems that the most straightforward approach is to handle the JavaScript code as plain text rather than interpreting it as a programming language.

One potential method is to divide the text based on the "+" symbol and extract the necessary array values.

Answer №4

While RegEx can be utilized in Java, a more efficient approach would be to utilize the standard String search methods and methodically reconstruct the JavaScript code within a StringBuilder object.

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