SerletFilter

AuthorizationFilter.java

@Override
public void doFilter(ServletRequest req, ServletResponse res,
		FilterChain chain) throws IOException, ServletException {

	HttpServletRequest request = (HttpServletRequest) req;

	HttpServletResponse response = (HttpServletResponse) res;

	HttpSession session = request.getSession();

	LOGGER.info("Invoking Authorization Filter");

	LOGGER.info("Destination URL is: " + request.getRequestURI());

	if (filterConfig == null)
		return;

	// get the Google user
	AppUser appUser = LoginService.login(request, response);

	if (appUser != null) {
		session.setAttribute(Constant.AUTH_USER, appUser);
	}

	// identify if user has an OAuth accessToken - it not, will set in motion
	// oauth procedure
	if (appUser.getCredentials() == null) {

		// need to save the target URI in session so we can forward to it when
		// oauth is completed
		session.setAttribute(Constant.TARGET_URI, request.getRequestURI());

		OAuthRequestService.requestOAuth(request, response, session);
		return;
	} else
		// store DocService in the session so it can be reused
		session.setAttribute(Constant.DOC_SESSION_ID,
				LoginService.docServiceFactory(appUser));

	chain.doFilter(request, response);

}