IpDetectController.java example

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robonobo-master
package com.robonobo.sonar;

import java.io.IOException;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
public class IpDetectController {
	Log log = LogFactory.getLog(getClass());
	
	@RequestMapping("/ipdetect")
	public void ipDetect(HttpServletRequest req, HttpServletResponse resp) throws IOException {
		resp.setStatus(HttpServletResponse.SC_OK);
		resp.setContentType("text/plain");
		String clientIp = getClientIpAddress(req);
		log.info("Returning IP address to "+clientIp);
		resp.getWriter().print(clientIp);
	}
	
	/** If we're behind a front end cache, the client ip of the request won't be accurate - figure out the real ip */
	protected String getClientIpAddress(HttpServletRequest req) {
		String forwardFor = req.getHeader("X-Forwarded-For");
		if(forwardFor == null)
			return req.getRemoteAddr();
		return forwardFor;
	}

}