1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
|
/*
* Copyright 2000-2016 Vaadin Ltd.
*
* 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 com.vaadin.server;
import java.io.IOException;
import java.io.Writer;
/**
* A {@link RequestHandler} that presents an informative page if the browser in
* use is unsupported. Recognizes Chrome Frame and allow it to be used.
*
* <p>
* This handler is usually added to the application by
* {@link LegacyCommunicationManager}.
* </p>
*/
@SuppressWarnings("serial")
public class UnsupportedBrowserHandler extends SynchronizedRequestHandler {
/** Cookie used to ignore browser checks */
public static final String FORCE_LOAD_COOKIE = "vaadinforceload=1";
@Override
public boolean synchronizedHandleRequest(VaadinSession session,
VaadinRequest request, VaadinResponse response) throws IOException {
// Check if the browser is supported
// If Chrome Frame is available we'll assume it's ok
WebBrowser b = session.getBrowser();
if (b.isTooOldToFunctionProperly() && !b.isChromeFrameCapable()) {
// bypass if cookie set
String c = request.getHeader("Cookie");
if (c == null || !c.contains(FORCE_LOAD_COOKIE)) {
writeBrowserTooOldPage(request, response);
return true; // request handled
}
}
return false; // pass to next handler
}
/**
* Writes a page encouraging the user to upgrade to a more current browser.
*
* @param request
* @param response
* @throws IOException
*/
protected void writeBrowserTooOldPage(VaadinRequest request,
VaadinResponse response) throws IOException {
try (Writer page = response.getWriter()) {
WebBrowser b = VaadinSession.getCurrent().getBrowser();
page.write(
"<html>"
+ "<head>"
+ " <style>"
+ " html {"
+ " background: #fff;"
+ " color: #444;"
+ " font: 400 1em/1.5 \"Helvetica Neue\", Roboto, \"Segoe UI\", sans-serif;"
+ " padding: 2em;"
+ " }"
+ " body {"
+ " margin: 2em auto;"
+ " width: 27em;"
+ " max-width: 100%;"
+ " }"
+ " h1 {"
+ " line-height: 1.1;"
+ " margin: 2em 0 1em;"
+ " color: #000;"
+ " font-weight: 400;"
+ " }"
+ " em {"
+ " font-size: 1.2em;"
+ " font-style: normal;"
+ " display: block;"
+ " margin-bottom: 1.2em;"
+ " }"
+ " p {"
+ " margin: 0.5em 0 0;"
+ " }"
+ " a {"
+ " text-decoration: none;"
+ " color: #007df0;"
+ " }"
+ " sub {"
+ " display: block;"
+ " margin-top: 2.5em;"
+ " text-align: center;"
+ " border-top: 1px solid #eee;"
+ " padding-top: 2em;"
+ " }"
+ " sub,"
+ " small {"
+ " color: #999;"
+ " }"
+ " </style>"
+ "</head>"
+ "<body><h1>I'm sorry, but your browser is not supported</h1>"
+ "<p>The version (" + b.getBrowserMajorVersion()
+ "." + b.getBrowserMinorVersion()
+ ") of the browser you are using "
+ " is outdated and not supported.</p>"
+ "<p>You should <b>consider upgrading</b> to a more up-to-date browser.</p> "
+ "<p>The most popular browsers are <b>"
+ " <a href=\"https://www.google.com/chrome\">Chrome</a>,"
+ " <a href=\"http://www.mozilla.com/firefox\">Firefox</a>,"
+ (b.isWindows()
? " <a href=\"http://windows.microsoft.com/en-US/internet-explorer/downloads/ie\">Internet Explorer</a>,"
: "")
+ " <a href=\"http://www.opera.com/browser\">Opera</a>"
+ " and <a href=\"http://www.apple.com/safari\">Safari</a>.</b><br/>"
+ "Upgrading to the latest version of one of these <b>will make the web safer, faster and better looking.</b></p>"
+ (b.isIE()
? "<script type=\"text/javascript\" src=\"http://ajax.googleapis.com/ajax/libs/chrome-frame/1/CFInstall.min.js\"></script>"
+ "<p>If you can not upgrade your browser, please consider trying <a onclick=\"CFInstall.check({mode:'overlay'});return false;\" href=\"http://www.google.com/chromeframe\">Chrome Frame</a>.</p>"
: "") //
+ "<p><sub><a onclick=\"document.cookie='"
+ FORCE_LOAD_COOKIE
+ "';window.location.reload();return false;\" href=\"#\">Continue without updating</a> (not recommended)</sub></p>"
+ "</body>\n" + "</html>");
}
}
}
|
