com.ningpai.common.util.CaptchaController.java Source code

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Here is the source code for com.ningpai.common.util.CaptchaController.java

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/*
* Copyright 2010-2013 NingPai, Inc. All rights reserved.
* NINGPAI PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/
/**
 * 
 */
package com.ningpai.common.util;

import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.IOException;

import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.lang.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import com.octo.captcha.service.CaptchaServiceException;
import com.octo.captcha.service.multitype.MultiTypeCaptchaService;

/**
 * ???
 * 
 * @author zhangcy
 * 
 */
@Controller
public class CaptchaController {

    public static final String CAPTCHA_IMAGE_FORMAT = "jpeg";

    @Autowired
    private MultiTypeCaptchaService captchaService;

    @RequestMapping("/captcha")
    public void writeCaptcha(HttpServletRequest request, HttpServletResponse response) {
        byte[] captchaChallengeAsJpeg = null;
        // the output stream to render the captcha image as jpeg into
        ByteArrayOutputStream jpegOutputStream = new ByteArrayOutputStream();
        try {
            // get the session id that will identify the generated captcha.
            // the same id must be used to validate the response, the session id is a good candidate!
            String captchaId = request.getSession().getId();
            BufferedImage challenge = captchaService.getImageChallengeForID(captchaId, request.getLocale());
            try {
                ImageIO.write(challenge, CAPTCHA_IMAGE_FORMAT, jpegOutputStream);
            } catch (IOException e) {
            }
        } catch (IllegalArgumentException e) {
            try {
                response.sendError(HttpServletResponse.SC_NOT_FOUND);
            } catch (IOException e1) {
            }
            return;
        } catch (CaptchaServiceException e) {
            try {
                response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
            } catch (IOException e1) {
            }
            return;
        }

        captchaChallengeAsJpeg = jpegOutputStream.toByteArray();

        // flush it in the response
        response.setHeader("Cache-Control", "no-store");
        response.setHeader("Pragma", "no-cache");
        response.setDateHeader("Expires", 0);
        response.setContentType("image/" + CAPTCHA_IMAGE_FORMAT);

        ServletOutputStream responseOutputStream;
        try {
            responseOutputStream = response.getOutputStream();
            responseOutputStream.write(captchaChallengeAsJpeg);
            responseOutputStream.flush();
            responseOutputStream.close();
        } catch (IOException e) {
        }

    }

    /**
     * AjaxloginName?
     */
    public boolean validateCaptcha(String captcha, String sessionID) {
        // If the captcha field is already rejected
        Boolean validCaptcha = false;
        if (StringUtils.isBlank(captcha)) {
            return validCaptcha;
        }
        try {
            validCaptcha = captchaService.validateResponseForID(sessionID, captcha);
        } catch (CaptchaServiceException e) {
        }
        return validCaptcha;
    }

}