This is a crude, experimental HTTP web service around Straightjacket and Nashorn.

It exposes an /execute endpoint that you can POST to with any JavaScript code snippet you want. Shrink then runs the script in a Straightjacket sandbox, exposing any Java packages you choose to allow.

This is just a simple proof of concept and is not production ready. Letting other people run scripts on your server has obvious security implications, so only run this in friendly environments.

To start the server, just run the main method of com.andyhawkes.shrink.Server. The server will listen on http://localhost:4567.

Navigate to http://localhost:4567 in your browser. Fill in a snippet of JavaScript (which must declare at least one function). Then enter the name of the function you want to execute, up to 3 optional arguments, and a comma-separated list of Java classes or packages that should be exposed to the script's classloader. Submitting this will send a POST to Shrink's /execute endpoint.

You can also run scripts with your HTTP client of choice. For instance, curl:

$ curl -X POST --data '{"script":"function hello() { return \"hello\"; }","function":"hello","arguments":[],"exposedJavaClasses":[""]}' http://localhost:4567/execute