PubSubHubbub subscriber (購読確認)

gistfile1.java

private static final String verifyToken = "this_is_test";

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
	String hubMode = request.getParameter("hub.mode");
	String hubChallenge = request.getParameter("hub.challenge");
	String hubVerifyToken = request.getParameter("hub.verify_token");

	if (hubMode != null && !hubMode.isEmpty() && hubChallenge != null
			&& !hubChallenge.isEmpty() && hubVerifyToken != null && !hubVerifyToken.isEmpty()) {
		if (hubVerifyToken.equals(verifyToken)) {
			if (hubMode.equals("subscribe") || hubMode.equals("unsubscribe")) {
				response.setContentType("text/plain;charset=UTF8");
				response.setStatus(HttpServletResponse.SC_OK);
				PrintWriter out = response.getWriter();
				out.print(hubChallenge);
			}
		} else {
			response.sendError(HttpServletResponse.SC_BAD_REQUEST, "Bad Request (verify token mismatch)");
		}
	} else {
		response.sendError(HttpServletResponse.SC_BAD_REQUEST, "Bad Request (parameter not set)");
	}
}