B4J Question How To Implement JWT on B4J web server

[adjie]

Currently I'm trying to implement JWT (JSON Web Tokens) in B4J server. I'm not familiar with java.
from this site https://github.com/jwtk/jjwt i got information that to get the token, the quick start is like this (in java) :

import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;
import io.jsonwebtoken.impl.crypto.MacProvider;
import java.security.Key;

// We need a signing key, so we'll create one just for this example. Usually
// the key would be read from your application configuration instead.
Key key = MacProvider.generateKey();

String compactJws = Jwts.builder()
  .setSubject("Joe")
  .signWith(SignatureAlgorithm.HS512, key)
  .compact();

What I have done is add the jar file to additional file like this.
#AdditionalJar: jjwt-0.8.0-SNAPSHOT.jar

Sub AppStart (Form1 As Form, Args() As String)
MainForm = Form1
    MainForm.RootPane.LoadLayout("frmMain") 
jo.InitializeStatic("io.jsonwebtoken.Jwts")
        MainForm.Show
End Sub

Sub cmdConnect_Action
    Dim cout As String
    jo.RunMethod("builder",Null)
    jo.runMethod("setSubject",Null)
    cout = jo.RunMethod("compact",Null)
    log(cout)
End Sub

but It just error on line jo.RunMethod("builder",Null)

how to implement it correctly in b4j ?

here is the complete error

Spoiler: the complete error

Waiting for debugger to connect...
Program started.
Error occurred on line: 45
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at anywheresoftware.b4j.object.JavaObject.RunMethod(JavaObject.java:131)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at anywheresoftware.b4a.shell.Shell.runVoidMethod(Shell.java:656)
at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:232)
at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:159)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:93)
at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:90)
at anywheresoftware.b4a.BA$2.run(BA.java:165)
at com.sun.javafx.application.PlatformImpl.lambda$null$170(PlatformImpl.java:295)
at com.sun.javafx.application.PlatformImpl$$Lambda$48/1296242029.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.application.PlatformImpl.lambda$runLater$171(PlatformImpl.java:294)
at com.sun.javafx.application.PlatformImpl$$Lambda$47/580024961.run(Unknown Source)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$145(WinApplication.java:101)
at com.sun.glass.ui.win.WinApplication$$Lambda$36/355629945.run(Unknown Source)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NoClassDefFoundError: com/fasterxml/jackson/core/JsonProcessingException
at io.jsonwebtoken.Jwts.builder(Jwts.java:116)
... 29 more
Caused by: java.lang.ClassNotFoundException: com.fasterxml.jackson.core.JsonProcessingException
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 30 more

 

[Erel]

What do you need it for?

You are missing the Jackson jar file. This library depends on it.

 

[adjie]

Has adding the jackson jar #AdditionalJar: com.fasterxml.jackson.core
but still no luck.

I need it to convert my php web server to b4j web server. the web app using angularjs(javascript) wich using JWT (Json Web Token https://jwt.io/) . It supported by many languages like .net, node.js, python, java, perl, ruby, php, etc..

very similar with b4x encryption https://www.b4x.com/android/forum/threads/jb4xencryption.48178/#content
but I really need this cause the front end using javascript. Many website / web apps that use jwt as security token. Android coded in java also using jwt.
Any help erel ?

 

[Erel]

Please upload:
1. The project.
2. The two jars.

 

[adjie]

Here is the project and the two jars in one zip file.

Need two methods:
1. jwt builder
2. jwt verify. The java code is like this:
assert Jwts.parser().setSigningKey(key).parseClaimsJws(compactJws).getBody().getSubject().equals("Joe");

 

[Erel]

  #AdditionalJar: jjwt-0.8.0-SNAPSHOT.jar
  #AdditionalJar:jackson-core-2.0.0
   #AdditionalJar:jackson-databind-2.0.0
   #AdditionalJar:jackson-annotations-2.0.0

You can find the three jars here: http://repo1.maven.org/maven2/com/fasterxml/jackson/core/

Log(jo.RunMethodJO("parser", Null).RunMethodJO("setSigningKey", Array(key)).RunMethodJO("parseClaimsJws", compactJws"). _
  RunMethodJO("getBody", Null).RunMethodJO("equals", Array("Joe"))

 

[adjie]

Nice information. Will try it tomorrow. Thank you erel.