image change to base 64

maxkey-authentications/maxkey-authentication-captcha/src/main/java/org/maxkey/web/contorller/ImageCaptchaBase64Endpoint.java

@@ -0,0 +1,142 @@
+/*
+ * Copyright [2020] [MaxKey of copyright http://www.maxkey.top]
+ * 
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+ 
+
+package org.maxkey.web.contorller;
+
+import com.google.code.kaptcha.Producer;
+import java.awt.image.BufferedImage;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.util.Base64;
+
+import javax.imageio.ImageIO;
+import javax.servlet.ServletOutputStream;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+
+
+/**
+ * ImageCaptchaEndpoint  Producer captcha.
+ * @author Crystal.Sea
+ *
+ */
+@Controller
+public class ImageCaptchaBase64Endpoint {
+    private static final Logger _logger = LoggerFactory.getLogger(ImageCaptchaBase64Endpoint.class);
+
+    public static final	String IMAGE_GIF 			= "image/gif";
+    
+    public static final	String KAPTCHA_SESSION_KEY 	= "kaptcha_session_key";
+    
+    @Autowired
+    private Producer captchaProducer;
+
+    /**
+     * captcha image Producer.
+     * 
+     * @param request HttpServletRequest
+     * @param response HttpServletResponse
+     */
+    @RequestMapping(value = "/captcha/base64")
+    public void captchaHandleRequest(HttpServletRequest  request, 
+    								 HttpServletResponse response, 
+    								 @RequestParam(value="captcha",required=false,defaultValue="text") String captchaType) {
+        try {
+        	
+            String kaptchaText = captchaProducer.createText();
+            if (captchaType.equalsIgnoreCase("Arithmetic")) {
+                Integer intParamA = Integer.valueOf(kaptchaText.substring(0, 1));
+                Integer intParamB = Integer.valueOf(kaptchaText.substring(1, 2));
+                Integer calculateValue = 0;
+                if ((intParamA > intParamB) && ((intParamA + intParamB) % 5 > 3)) {
+                    calculateValue = intParamA - intParamB;
+                    kaptchaText = intParamA + "-" + intParamB + "=?";
+                } else {
+                    calculateValue = intParamA + intParamB;
+                    kaptchaText = intParamA + "+" + intParamB + "=?";
+                }
+                _logger.trace("Sesssion id " + request.getSession().getId() 
+                        + " , Arithmetic calculate Value is " + calculateValue);
+                request.getSession().setAttribute(
+                        KAPTCHA_SESSION_KEY, calculateValue + "");
+            } else {
+                // store the text in the session
+                request.getSession().setAttribute(KAPTCHA_SESSION_KEY, kaptchaText);
+            }
+            _logger.trace("Sesssion id " + request.getSession().getId() 
+                                + " , Captcha Text is " + kaptchaText);
+           
+            // create the image with the text
+            BufferedImage bufferedImage = captchaProducer.createImage(kaptchaText);
+            producerImage(request,response,bufferedImage);
+        } catch (Exception e) {
+            _logger.error("captcha Producer Error " + e.getMessage());
+        }
+    }
+
+    /**
+     * producerImage.
+     * @param request HttpServletRequest
+     * @param response HttpServletResponse
+     * @param bufferedImage BufferedImage
+     * @throws IOException error
+     */
+    public static void producerImage(HttpServletRequest request, 
+                              HttpServletResponse response,
+                              BufferedImage bufferedImage) throws IOException {
+        // Set to expire far in the past.
+        response.setDateHeader("Expires", 0);
+        // Set standard HTTP/1.1 no-cache headers.
+        response.setHeader("Cache-Control", "no-store, no-cache, must-revalidate");
+        // Set IE extended HTTP/1.1 no-cache headers (use addHeader).
+        response.addHeader("Cache-Control", "post-check=0, pre-check=0");
+        // Set standard HTTP/1.0 no-cache header.
+        response.setHeader("Pragma", "no-cache");
+        // return a jpeg/gif
+        //response.setContentType(IMAGE_GIF);
+        _logger.trace("create the image");
+        // create the image
+        if (bufferedImage != null) {
+            ServletOutputStream out = response.getOutputStream();
+            // write the data out
+            ByteArrayOutputStream stream = new ByteArrayOutputStream();
+			ImageIO.write(bufferedImage, "png", stream);
+			String b64Image = "data:image/png;base64," + Base64.getEncoder().encodeToString(stream.toByteArray());
+            out.print(b64Image);
+            _logger.debug("b64Image {}" , b64Image);
+            stream.close();
+            try {
+                out.flush();
+            } finally {
+                out.close();
+            }
+        }
+    }
+
+	public void setCaptchaProducer(Producer captchaProducer) {
+        this.captchaProducer = captchaProducer;
+    }
+
+
+}