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Writing Secure Ajax Portlets for Liferay using DWR

Liferay PortletSession cannot be shared with DWR Servlet Session however using following technique we can copy required information from Liferay Session to Application Session

request.getPortletSession().setAttribute("remoteUser", request.getRemoteUser(), PortletSession.APPLICATION_SCOPE);


Access above session data inside DWR

public String test(HttpSession session) {

/**
* s1 == portal session
* s2 == DWR session
*
* s1 expires before s2 --> s2 will also expire (Tested)
* s2 expires before s1 --> s2 invalidates and should work after reload (Tested)
* s1 & s2 expires --> user reloads and relogins both should work
*
*/

String userId = (String) session.getAttribute("remoteUser");
if (userId == null) {
session.invalidate();
return "Page reload is required!";
}
return userId;
}

the above code is pretty self explanatory and safe way of exposing DWR services in a Portal Architecture.

have fun....

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