2 * Copyright 2008 ZXing authors
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 package com.google.zxing.web;
19 import com.google.zxing.DecodeHintType;
20 import com.google.zxing.MultiFormatReader;
21 import com.google.zxing.Reader;
22 import com.google.zxing.ReaderException;
23 import com.google.zxing.Result;
24 import com.google.zxing.client.j2se.BufferedImageMonochromeBitmapSource;
25 import com.google.zxing.client.result.ParsedResult;
26 import com.google.zxing.client.result.ResultParser;
27 import org.apache.commons.fileupload.FileItem;
28 import org.apache.commons.fileupload.FileUploadException;
29 import org.apache.commons.fileupload.disk.DiskFileItemFactory;
30 import org.apache.commons.fileupload.servlet.ServletFileUpload;
31 import org.apache.commons.lang.StringEscapeUtils;
32 import org.apache.http.Header;
33 import org.apache.http.HttpException;
34 import org.apache.http.HttpMessage;
35 import org.apache.http.HttpResponse;
36 import org.apache.http.HttpVersion;
37 import org.apache.http.client.HttpClient;
38 import org.apache.http.client.methods.HttpGet;
39 import org.apache.http.conn.PlainSocketFactory;
40 import org.apache.http.conn.Scheme;
41 import org.apache.http.conn.SchemeRegistry;
42 import org.apache.http.conn.ssl.SSLSocketFactory;
43 import org.apache.http.impl.client.DefaultHttpClient;
44 import org.apache.http.impl.conn.tsccm.ThreadSafeClientConnManager;
45 import org.apache.http.params.BasicHttpParams;
46 import org.apache.http.params.HttpParams;
47 import org.apache.http.params.HttpProtocolParams;
49 import javax.imageio.ImageIO;
50 import javax.mail.Authenticator;
51 import javax.servlet.ServletConfig;
52 import javax.servlet.ServletException;
53 import javax.servlet.http.HttpServlet;
54 import javax.servlet.http.HttpServletRequest;
55 import javax.servlet.http.HttpServletResponse;
56 import java.awt.image.BufferedImage;
57 import java.io.IOException;
58 import java.io.InputStream;
59 import java.io.OutputStreamWriter;
60 import java.io.Writer;
62 import java.net.URISyntaxException;
63 import java.net.UnknownHostException;
64 import java.util.Hashtable;
65 import java.util.List;
66 import java.util.Timer;
67 import java.util.logging.Logger;
70 * {@link HttpServlet} which decodes images containing barcodes. Given a URL, it will
71 * retrieve the image and decode it. It can also process image files uploaded via POST.
73 * @author Sean Owen (srowen@google.com)
75 public final class DecodeServlet extends HttpServlet {
77 private static final long MAX_IMAGE_SIZE = 500000L;
78 private static final long EMAIL_CHECK_INTERVAL = 2L * 60 * 1000;
80 private static final Logger log = Logger.getLogger(DecodeServlet.class.getName());
82 static final Hashtable<DecodeHintType, Object> HINTS;
85 HINTS = new Hashtable<DecodeHintType, Object>(3);
86 HINTS.put(DecodeHintType.TRY_HARDER, Boolean.TRUE);
89 private HttpClient client;
90 private DiskFileItemFactory diskFileItemFactory;
91 private Timer emailTimer;
94 public void init(ServletConfig servletConfig) throws ServletException {
96 Logger logger = Logger.getLogger("com.google.zxing");
97 logger.addHandler(new ServletContextLogHandler(servletConfig.getServletContext()));
99 String emailAddress = servletConfig.getInitParameter("emailAddress");
100 String emailPassword = servletConfig.getInitParameter("emailPassword");
101 if (emailAddress == null || emailPassword == null) {
102 throw new ServletException("emailAddress or emailPassword not specified");
105 HttpParams params = new BasicHttpParams();
106 HttpProtocolParams.setVersion(params, HttpVersion.HTTP_1_1);
108 SchemeRegistry registry = new SchemeRegistry();
109 registry.register(new Scheme("http", PlainSocketFactory.getSocketFactory(), 80));
110 registry.register(new Scheme("https", SSLSocketFactory.getSocketFactory(), 443));
112 client = new DefaultHttpClient(new ThreadSafeClientConnManager(params, registry), params);
114 diskFileItemFactory = new DiskFileItemFactory();
116 Authenticator emailAuthenticator = new EmailAuthenticator(emailAddress, emailPassword);
117 emailTimer = new Timer("Email decoder timer", true);
118 emailTimer.schedule(new DecodeEmailTask(emailAddress, emailAuthenticator), 0L, EMAIL_CHECK_INTERVAL);
120 log.info("DecodeServlet configured");
124 protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
126 String imageURIString = request.getParameter("u");
127 if (imageURIString == null || imageURIString.length() == 0) {
128 response.sendRedirect("badurl.jspx");
132 if (!(imageURIString.startsWith("http://") || imageURIString.startsWith("https://"))) {
133 imageURIString = "http://" + imageURIString;
138 imageURI = new URI(imageURIString);
139 } catch (URISyntaxException urise) {
140 response.sendRedirect("badurl.jspx");
144 HttpGet getRequest = new HttpGet(imageURI);
147 HttpResponse getResponse = client.execute(getRequest);
148 if (getResponse.getStatusLine().getStatusCode() != HttpServletResponse.SC_OK) {
149 response.sendRedirect("badurl.jspx");
152 if (!isSizeOK(getResponse)) {
153 response.sendRedirect("badimage.jspx");
156 log.info("Decoding " + imageURI);
157 InputStream is = getResponse.getEntity().getContent();
159 processStream(is, request, response);
163 } catch (InterruptedException ie) {
165 response.sendRedirect("badurl.jspx");
166 } catch (HttpException he) {
168 response.sendRedirect("badurl.jspx");
169 } catch (UnknownHostException uhe) {
171 response.sendRedirect("badurl.jspx");
177 protected void doPost(HttpServletRequest request, HttpServletResponse response)
178 throws ServletException, IOException {
180 if (!ServletFileUpload.isMultipartContent(request)) {
181 response.sendRedirect("badimage.jspx");
185 ServletFileUpload upload = new ServletFileUpload(diskFileItemFactory);
186 upload.setFileSizeMax(MAX_IMAGE_SIZE);
190 for (FileItem item : (List<FileItem>) upload.parseRequest(request)) {
191 if (!item.isFormField()) {
192 if (item.getSize() <= MAX_IMAGE_SIZE) {
193 log.info("Decoding uploaded file");
194 InputStream is = item.getInputStream();
196 processStream(is, request, response);
201 response.sendRedirect("badimage.jspx");
206 } catch (FileUploadException fue) {
207 response.sendRedirect("badimage.jspx");
212 private static void processStream(InputStream is, HttpServletRequest request, HttpServletResponse response)
213 throws ServletException, IOException {
214 BufferedImage image = ImageIO.read(is);
216 response.sendRedirect("badimage.jspx");
220 Reader reader = new MultiFormatReader();
223 result = reader.decode(new BufferedImageMonochromeBitmapSource(image), HINTS);
224 } catch (ReaderException re) {
225 log.info("DECODE FAILED: " + re.toString());
226 response.sendRedirect("notfound.jspx");
230 if (request.getParameter("full") == null) {
231 response.setContentType("text/plain");
232 response.setCharacterEncoding("UTF8");
233 Writer out = new OutputStreamWriter(response.getOutputStream(), "UTF8");
235 out.write(result.getText());
240 request.setAttribute("result", result);
241 byte[] rawBytes = result.getRawBytes();
242 if (rawBytes != null) {
243 request.setAttribute("rawBytesString", arrayToString(rawBytes));
245 request.setAttribute("rawBytesString", "(Not applicable)");
247 String text = result.getText();
249 request.setAttribute("text", StringEscapeUtils.escapeXml(text));
251 request.setAttribute("text", "(Not applicable)");
253 ParsedResult parsedResult = ResultParser.parseResult(result);
254 request.setAttribute("parsedResult", parsedResult);
255 String displayResult = parsedResult.getDisplayResult();
256 if (displayResult != null) {
257 request.setAttribute("displayResult", StringEscapeUtils.escapeXml(displayResult));
259 request.setAttribute("displayResult", "(Not applicable)");
261 request.getRequestDispatcher("decoderesult.jspx").forward(request, response);
265 private static boolean isSizeOK(HttpMessage getResponse) {
266 Header lengthHeader = getResponse.getLastHeader("Content-Length");
267 if (lengthHeader != null) {
268 long length = Long.parseLong(lengthHeader.getValue());
269 if (length > MAX_IMAGE_SIZE) {
276 private static String arrayToString(byte[] bytes) {
277 int length = bytes.length;
278 StringBuilder result = new StringBuilder(length << 2);
281 int max = Math.min(i + 8, length);
282 for (int j = i; j < max; j++) {
283 int value = bytes[j] & 0xFF;
284 result.append(Integer.toHexString(value / 16));
285 result.append(Integer.toHexString(value % 16));
291 for (int j = i - 8; j < length; j++) {
292 result.append(Integer.toHexString(bytes[j] & 0xFF));
295 return result.toString();
299 public void destroy() {
300 log.config("DecodeServlet shutting down...");