Hello Assaf Elgov,
As Pai mentioned, you need to create a Thingworx Extension - please refer to Thingworx Extension guide for further details. Extensions for Thingworx are created in Java and they are great if you need to extend the possibilities of the Platform.
One of the entity types you can create in the Extension is an Authenticator. It's an object that can handle / process the authentication request. In every Authenticator you should implement three methods (please find more here: PTC). One is authenticate, it takes two parameters - HttpRequest and HttpResponse. In this method you should implement your logic (e.g. to take the URL of the request:
String url = httpServletRequest.getRequestURI(); // e.g. /Thingworx/Runtime/...
Then you can redirect to another URL:
httpServletResponse.sendRedirect("/Thingworx/Runtime/index.html#mashup=b");
Notice, that there is a bunch of OOTB Authenticators in Thingworx ant every has its priority (order). If prior Authenticator is fired and authenticates user successfully, the rest is skipped.
Please also note, that if you redirect to another mashup, it would require login from the user anyway. That's why I recommend to redirect to the Organizational login page, which then allows to login in a nicer-looking way:
httpServletResponse.sendRedirect("/Thingworx/FormLogin/<OrganizationName>");
Don't forget, that User needs to be a member of the Organization to be able to use its Login Page to authenticate.
Hope it helps, if you need any further assistance, don't hesitate to ask.
Regards,
J.
