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/*
* Copyright 2000-2014 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 {
Writer page = response.getWriter();
WebBrowser b = VaadinSession.getCurrent().getBrowser();
page.write("<html><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+ " is outdated and not supported.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>");
page.close();
}
}
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