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1
11 package org.eclipse.help.internal.webapp.servlet;
12
13 import java.io.*;
14
15 import javax.servlet.http.*;
16
17 import org.eclipse.help.internal.webapp.*;
18 import org.eclipse.help.internal.webapp.data.*;
19
20
25 public class CookieUtil {
26 private static final int COOKIE_LIFE = 5 * 365 * 24 * 60 * 60;
27 private static final int MAX_COOKIE_PAYLOAD = 4096
28 - "wset01=".length() - "81920<".length() - 1;
30
33 public static String  getCookieValue(String name, HttpServletRequest request) {
34 String ret = null;
35 Cookie[] cookies = request.getCookies();
36 if (cookies != null) {
37 for (int i = 0; i < cookies.length; i++) {
38 if (name.equals(cookies[i].getName())) {
39 ret = cookies[i].getValue();
40 break;
41 }
42 }
43 }
44 if (HelpWebappPlugin.DEBUG_WORKINGSETS) {
45 System.out.println("CookieUtil.getCookieValue(" + name + ", " + request.getRequestURI() + ") returning " + ret);
49 }
50 return ret;
51 }
52 public static void setCookieValue(String name, String value,
53 HttpServletResponse response) {
54 Cookie cookie = new Cookie(name, value);
55 cookie.setMaxAge(COOKIE_LIFE);
56 response.addCookie(cookie);
57 if (HelpWebappPlugin.DEBUG_WORKINGSETS) {
58 System.out
59 .println("CookieUtil.setCookieValue(" + name + ", " + value + ",...)"); }
61 }
62
63 public static void deleteCookie(String name, HttpServletResponse response) {
64 Cookie cookie = new Cookie(name, ""); cookie.setMaxAge(0);
66 response.addCookie(cookie);
67 }
68
79 public static void saveString(String name, String data, int maxCookies,
80 HttpServletRequest request, HttpServletResponse response)
81 throws IOException {
82 int len = data.length();
83 int n = len / MAX_COOKIE_PAYLOAD;
84 if (n > maxCookies) {
85 throw new IOException(WebappResources.getString(
86 "CookieUtil.tooManyCookiesNeeded", UrlUtil.getLocaleObj( request, response)));
88 }
89 for (int i = 1; i <= n; i++) {
90 if (i == 1) {
91 setCookieValue(name + "1", len + "<" + data.substring(0, MAX_COOKIE_PAYLOAD), response);
94 } else {
95 setCookieValue(name + i, data.substring(MAX_COOKIE_PAYLOAD
96 * (i - 1), MAX_COOKIE_PAYLOAD * i), response);
97 }
98 }
99 if (len % MAX_COOKIE_PAYLOAD > 0) {
100 if (n == 0) {
101 setCookieValue(name + "1", len + "<" + data.substring(0, len), response);
104 } else {
105 setCookieValue(name + (n + 1), data.substring(
106 MAX_COOKIE_PAYLOAD * n, len), response);
107 }
108 }
109
110 for (int i = n + 1; i <= maxCookies; i++) {
113 if (i == n + 1 && len % MAX_COOKIE_PAYLOAD > 0) {
114 continue;
115 }
116 if (getCookieValue(name + i, request) != null) {
117 deleteCookie(name + i, response);
118 } else {
119 break;
120 }
121 }
122 }
123
126 public static String restoreString(String name, HttpServletRequest request) {
127 String value1 = CookieUtil.getCookieValue(name + "1", request); if (value1 == null) {
129 return null;
131 }
132 String lengthAndSubstring1[] = value1.split("<"); if (lengthAndSubstring1.length < 2) {
134 return null;
135 }
136 int len = 0;
137 try {
138 len = Integer.parseInt(lengthAndSubstring1[0]);
139 } catch (NumberFormatException nfe) {
140 return null;
141 }
142 if (len <= 0) {
143 return null;
144 }
145 StringBuffer data = new StringBuffer (len);
146 data.append(lengthAndSubstring1[1]);
147 int n = len / MAX_COOKIE_PAYLOAD;
148 for (int i = 2; i <= n; i++) {
149 String substring = CookieUtil.getCookieValue(name + i, request);
150 if (substring == null) {
151 return null;
152 }
153 data.append(substring);
154 }
155 if (len % MAX_COOKIE_PAYLOAD > 0 && n > 0) {
156 String substring = CookieUtil.getCookieValue(name + (n + 1),
157 request);
158 if (substring == null) {
159 return null;
160 }
161 data.append(substring);
162 }
163
164 if (data.length() != len) {
165 return null;
166 }
167
168 return data.toString();
169 }
170 }
171 |
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