Develop Reference

Execution uglifyJs2 via Nashorn

I extracted uglifyJs2 via uglifyjs --self and I'm trying to minify app.js using uglify.js. I expect, that minified js should be generated into new file or console at least but now it doesn't work. What should I do to minify app.js using uglify.min.js?
public static void main(String[] args) throws Exception {
ScriptEngine scriptEngine = new ScriptEngineManager().getEngineByName("nashorn");
Bindings bindings = new SimpleBindings();
bindings.put("console", System.console());
executeJs("uglifyjs.min.js",scriptEngine, bindings);
String res = (String) invocable.invokeFunction("UglifyJS.parse(code)", code);
//Here I got NoSuchMethodException: No such function UglifyJS.parse(code)
}
static String readFile(String path, Charset encoding)
throws IOException
{
byte[] encoded = Files.readAllBytes(Paths.get(path));
return new String(encoded, encoding);
}
private static void executeJs(String fileName, ScriptEngine engine, Bindings bindings) throws Exception {
String test = readFile(fileName, StandardCharsets.UTF_8);
engine.put(ScriptEngine.FILENAME, fileName);
engine.eval(test, bindings);
}
When i mo

invokeFunction can be used to invoke only global functions. It can not be used to evaluate arbitrary code like you've above. The following will work:
// define a global function that accepts one arg and invoke UglifyJS.parse on it
scriptEngine.eval("function func(code) { return UglifyJS.parse(code) }");
// call the newly defined global function "func"
invocable.invokeFunction("func", code);

As an alternative...
ScriptObjectMirror uglify = (ScriptObjectMirror)this.scriptEngine.eval("UglifyJS");
String ugly = (String)uglify.callMember("parse", "mycode");
It does appear a wee bit slower in 100,000 calls of uglify.callMember(...) on my system its about 150ms slower. It didn't seem to make any improvement by first calling uglify.getMember("parse") and using call directly on that object.
It does however avoid a naming conflict

Simplest way to "unpack" obfuscated javascript from within a Java program

Let's say that you have a web page that only contains obfuscated Javascript in the form of an eval(...) function within a script tag.
Dean Edwards' online unpacker (link) correctly unpacks this Javascript.
I would like to write a simple Java class that loads the initial web page (I use HttpClient), extracts the eval(...) function from the HTML, and unpacks it, in order to obtain the de-obfuscated Javascript.
I've tried with Rhino, here's my code :
int start = html.indexOf("<script>eval") + "<script>".length();
int end = html.indexOf("</script>");
javascript = html.substring(start, end);
evaled = eval(javascript);
NativeFunction fEvaled = (NativeFunction) evaled;
String encodedSource = fEvaled.getEncodedSource();
log.info("encodedSource: " + encodedSource);
and the "eval" java function called:
private Object eval(String javascript){
ScriptEngineManager factory = new ScriptEngineManager();
ScriptEngine engine = factory.getEngineByName("JavaScript");
Object eval = null;
try {
eval = engine.eval(javascript);
} catch (ScriptException e) {
// TODO Auto-generated catch block
log.error("Exception evaluating javascript " + javascript, e);
}
return eval;
}
But, that doesn't work, the code returned is far from being the correct code (returned by Edwards' unpacker). I've inspected the Rhino variables, found nothing useful.
Am I doing something wrong ?
I'm open to any suggestion, for example if there's a command-line tool that will work I can make a system call.
I'm on Ubuntu.
Thanks.

How to call javascript from java code

I have no idea how to do this and found some examples of how to call it however creating the script in java code (what I don't want), in ASP.NET I would use this code ScriptManager.RegisterStartupScript(this.Page, Page.GetType(), "info only", "alert('" + message + "');", true); to call my script + pass parameters and would work fine as I wished. However I have no idea of how to do this in java. Thank you

Simply by googling I found this link which provides good examples on how to invoke a javascript file.
Here is a simple example to get you going:
import java.io.*;
import javax.script.*;
public class App
{
public static void main(String[] args)
{
String file = "javascript.js";
try
{
ScriptEngine engine =
new ScriptEngineManager().getEngineByName("javascript");
FileReader fr = new FileReader(file);
engine.eval(fr);
}
catch(IOException ioEx)
{
ioEx.printStackTrace();
}
catch(ScriptException scrEx)
{
scrEx.printStackTrace();
}
}
}

I saw that it wasn't possible to call my javascript via Servlet, however if I just pass my parameters using my resp/req objects and retrieve them in my JSP page and my JSP page call myt javascript method would work.
Anyway here is the code I used:
Check if my params arent empty and call my script
<c:if test="${not empty errors}">
<script>displayErrors(errors);</script>
</c:if>
The script I would like to call (sample):
<script>
var errors = ${errors};
if (errors.length) {
displayErrors(errors);
}
</script>
And I found this answer here (How to call function of JavaScript from servlet)
Big thanks for everybody

Java - Flex 4 AIR 2.0 Native Process

i'm using Flex 4 Native Process to interact with Java to connect to a remote server using PHP.
I tried this example i found on the internet to connect Flex with Java:
Flex:
protected function windowedApplication1_creationCompleteHandler(event: FlexEvent): void
{
var info:NativeProcessStartupInfo = new NativeProcessStartupInfo();
info.executable = new File("C:/Program Files/Java/jre6/bin/java.exe");
info.workingDirectory = File.applicationDirectory;
var args: Vector.<String> = new Vector.<String>();
args.push("-cp", "../bin", "scanner.Main");
info.arguments = args;
process = new NativeProcess();
process.addEventListener(ProgressEvent.STANDARD_OUTPUT_DATA, onDataOutput);
process.start(info);
}
private function onDataOutput(event: ProgressEvent): void
{
var message:String = process.standardOutput.readUTFBytes(process.standardOutput.bytesAvailable);
Alert.show(message);
}
Java:
public static void main(String[] args)
{
String input;
Scanner scanner = new Scanner(System.in);
while (scanner.hasNext("hello|stop"))
{
input = scanner.next();
if (input.equals("hello"))
{
System.out.println("hello flex! ... from java");
}
else if (input.equals("stop"))
{
return;
}
}
}
And it works perfect.
But when i try calling the Java method that connects to the remote server, switching the line System.out.println("hello flex! ... from java"); for the name of the method, it dies (does nothing).
I'm new to the Native Process concept, but researching on the web i found out that you need to send the libraries as arguments that your project uses.
I need some help on how to do so.
The Java project uses Http and JSon libraries.
How do i add those to the arguments? and do i need to add the JRE System libraries too?
PS: The java method works fine if i execute it from eclipse.
Thank you.
Edit: Tried it with a Jar file
var file:File = new File("C:/Program Files/Java/jre6/");
file = file.resolvePath("bin/javaw.exe");
var arg:Vector.<String> = new Vector.<String>;
arg.push("-jar");
arg.push(File.applicationDirectory.resolvePath("prueba3.jar").nativePath);
arg.push("-Djava.library.path=C:\\Users\\Administrador\\Desktop\\libhttp");
var npInfo:NativeProcessStartupInfo = new NativeProcessStartupInfo();
npInfo.executable = file;
npInfo.arguments = arg;
process = new NativeProcess();
process.addEventListener(ProgressEvent.STANDARD_OUTPUT_DATA, onStandardOutputData);
process.start(npInfo);
and adding the library path, but still didn't work.

You could make a AMFPHP service, and connect directly to PHP with AS3

Can Verification Java API in Digital Persona One Touch run w/o RTE?

Does this code require the Digital Persona One Touch RTE (Runtime environment) to work?:
DPFPVerification verifier = DPFPGlobal.getVerificationFactory().createVerification();
If so, is there another way to verify Digital Persona SampleFeatures (serialized) against a Digital Persona Template (serialized) using only the dpfp JARs?
Reason: We plan to have our DPFP verifier on a Web Service provided by TIBCO.
Any help is greatly appreciated!
I get a Java JNI exception with this sample test main code:
import com.digitalpersona.onetouch.DPFPFeatureSet;
import com.digitalpersona.onetouch.DPFPFeatureSetFactory;
import com.digitalpersona.onetouch.DPFPGlobal;
import com.digitalpersona.onetouch.DPFPTemplate;
import com.digitalpersona.onetouch.DPFPTemplateFactory;
import com.digitalpersona.onetouch.verification.DPFPVerification;
import com.digitalpersona.onetouch.verification.DPFPVerificationResult;
public class Main {
/**
* fingerScanTemplate is from WC DB
* sample is from the WS input parameters
*/
public boolean performVerification(byte[] fingerScanTemplate, byte[] sampleFeatures) {
DPFPTemplateFactory templateFactory = DPFPGlobal.getTemplateFactory();
DPFPFeatureSetFactory featureSetFactory = DPFPGlobal.getFeatureSetFactory();
DPFPVerification verifier = DPFPGlobal.getVerificationFactory().createVerification();
// Deserialize template & sampleFeature
DPFPTemplate deserializedTemplate = templateFactory.createTemplate(fingerScanTemplate);
DPFPFeatureSet features = featureSetFactory.createFeatureSet(sampleFeatures);
//Compare the feature set with the template, based on which finger was captured
DPFPVerificationResult result = null;
result = verifier.verify(features, deserializedTemplate);
return result != null && result.isVerified();
}
/**
* #param args
*/
public static void main(String[] args) {
new Main().performVerification(null, null);
}
}

No you should not need some sort of RTE. I do know that I had to have the One Touch SDK installed because it runs a windows service called Biometric scanning or something similar. The main problem I see with your code is that:
DPFPVerificationResult result = null;
result = verifier.verify(features, deserializedTemplate);
Needs to be:
DPFP.Verification.Verification.Result result = new DPFP.Verification.Verification.Result();
verifier.verify(features, template, ref result );
At least that is what got my code to start verifying correctly. I also had to fix a programmer's mistake in creating the FeatureSet which needs to be done like this:
DPFP.FeatureSet features = ExtractFeatures(Sample, DPFP.Processing.DataPurpose.Verification);
I have a feeling you are using an older SDK than I am but maybe this will help out some.