AEM OSGI and PYTHON(yowsup)

As fa as I know about Yowsup, Yowsup is a python library that enables you build application which use WhatsApp service.
yowsup-cli is a command line interface to Yowsup library.
We need to use yowsup-cli for sending or reciveing messages.

So you can create a OSGI Sling service from which you can call Python scripts.
Option 1:-
//Link:- http://blog.xebia.in/2013/11/25/yowsup-the-whatsapp-api/

To embed it in Java, all you have to do is call this command from Java's process builder framework. For this, first create a shell script to send message. Name it `sendMessage.sh` which looks like: 

                     #!/bin/bash
         python yowsup-cli -c config.example -s $1 "$2"

         
         String message = "The message goes here";
        String[] sendCommand = { "/bin/bash", “path/to/sendMessage.sh”, "<to number including cc>", message };
        ProcessBuilder processBuilder = new ProcessBuilder();processBuilder.directory(new File(<YOWSUP_HOME>));
        processBuilder.environment().put("PYTHONPATH", <YOWSUP_HOME>);
        processBuilder.command(sendCommand);
        System.out.println(processBuilder.environment());
        Process process = processBuilder.start();
        process.waitFor();

  8. Run the above program and your message will be sent to the intended receiver.
  9. You can read the ` process.getInputStream()` to get the output of the script you executed. For ex- 

                    InputStream stream = process.getInputStream();
        BufferedReader br = new BufferedReader(new InputStreamReader(stream));
        String str = null;
        while ((str = br.readLine()) != null) {
            System.out.println(str);
        }

Option 2:-
//Link:- http://stackoverflow.com/questions/16447410/how-to-execute-python-script-from-java
Execute Python script from Java?

Put your command to a shell script and execute that shell script with .exec() or
You can do something similar to the following

String[] cmd = {
        "/bin/bash",
        "-c",
        "echo password | python script.py '" + packet.toString() + "'"
    };
Runtime.getRuntime().exec(cmd);

I am not sure about if we can do something with REST APIs, if we have rest framework for Yowsup, then we can call the APIs from OSGI Sling Service.

I hope this would help you.

Thanks and Regards
Kautuk Sahni