| ETagUtil.java |
1 /**
2 * Copyright (c) 2000-2009 Liferay, Inc. All rights reserved.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a copy
5 * of this software and associated documentation files (the "Software"), to deal
6 * in the Software without restriction, including without limitation the rights
7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
8 * copies of the Software, and to permit persons to whom the Software is
9 * furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
20 * SOFTWARE.
21 */
22
23 package com.liferay.portal.servlet.filters.etag;
24
25 import com.liferay.portal.kernel.servlet.HttpHeaders;
26 import com.liferay.portal.kernel.util.GetterUtil;
27 import com.liferay.portal.util.PropsUtil;
28
29 import java.util.Arrays;
30
31 import javax.servlet.http.HttpServletRequest;
32 import javax.servlet.http.HttpServletResponse;
33
34 /**
35 * <a href="ETagUtil.java.html"><b><i>View Source</i></b></a>
36 *
37 * @author Brian Wing Shun Chan
38 */
39 public class ETagUtil {
40
41 public static boolean processETag(
42 HttpServletRequest request, HttpServletResponse response,
43 byte[] bytes) {
44
45 if (!_ETAG_FILTER_ENABLED) {
46 return false;
47 }
48
49 String eTag = Integer.toHexString(Arrays.hashCode(bytes));
50
51 response.setHeader(HttpHeaders.ETAG, eTag);
52
53 String ifNoneMatch = request.getHeader(HttpHeaders.IF_NONE_MATCH);
54
55 if (eTag.equals(ifNoneMatch)) {
56 response.setStatus(HttpServletResponse.SC_NOT_MODIFIED);
57 response.setContentLength(0);
58
59 return true;
60 }
61 else {
62 return false;
63 }
64 }
65
66 public static boolean processETag(
67 HttpServletRequest request, HttpServletResponse response, String s) {
68
69 return processETag(request, response, s.getBytes());
70 }
71
72 private static final boolean _ETAG_FILTER_ENABLED = GetterUtil.getBoolean(
73 PropsUtil.get(ETagFilter.class.getName()), true);
74
75 }