package com.wsm.admin.api;

import com.google.code.kaptcha.Producer;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.IOException;

@Controller
public class KaptchaController {

    @Autowired
    private Producer captchaProducer;

    /**
     * 后台登录验证码
     * @param request
     * @param response
     * @throws Exception
     */
    @RequestMapping("/kaptcha")
    public void kaptcha(HttpServletRequest request, HttpServletResponse response) throws Exception {
        generateKaptcha(request, response, "validateCode");
    }

    /**
     * 官网登录验证码
     * @param request
     * @param response
     * @throws Exception
     */
    @RequestMapping("/api/kaptcha")
    public void apiKaptcha(HttpServletRequest request, HttpServletResponse response) throws Exception {
        generateKaptcha(request, response, "apiValidateCode");
    }

    private void generateKaptcha(HttpServletRequest request, HttpServletResponse response, String apiValidateCode) throws IOException {
        byte[] captchaChallengeAsJpeg;
        ByteArrayOutputStream jpegOutputStream = new ByteArrayOutputStream();
        try {
            //生产验证码字符串并保存到session中
            String createText = captchaProducer.createText();
            request.getSession().setAttribute(apiValidateCode, createText);
            //使用生产的验证码字符串返回一个BufferedImage对象并转为byte写入到byte数组中
            BufferedImage challenge = captchaProducer.createImage(createText);
            ImageIO.write(challenge, "jpg", jpegOutputStream);
        } catch (IllegalArgumentException e) {
            response.sendError(HttpServletResponse.SC_NOT_FOUND);
            return;
        }

        //定义response输出类型为image/jpeg类型，使用response输出流输出图片的byte数组
        captchaChallengeAsJpeg = jpegOutputStream.toByteArray();
        response.setHeader("Cache-Control", "no-store");
        response.setHeader("Pragma", "no-cache");
        response.setDateHeader("Expires", 0);
        response.setContentType("image/jpeg");
        ServletOutputStream responseOutputStream = response.getOutputStream();
        responseOutputStream.write(captchaChallengeAsJpeg);
        responseOutputStream.flush();
        responseOutputStream.close();
    }

}
