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- /*
- * Copyright 2011 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;
-
- import com.vaadin.Application;
-
- /**
- * 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 AbstractCommunicationManager}.
- * </p>
- */
- @SuppressWarnings("serial")
- public class UnsupportedBrowserHandler implements RequestHandler {
-
- /** Cookie used to ignore browser checks */
- public static final String FORCE_LOAD_COOKIE = "vaadinforceload=1";
-
- @Override
- public boolean handleRequest(Application application,
- WrappedRequest request, WrappedResponse response)
- throws IOException {
-
- if (request.getBrowserDetails() != null) {
- // Check if the browser is supported
- // If Chrome Frame is available we'll assume it's ok
- WebBrowser b = request.getBrowserDetails().getWebBrowser();
- 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(WrappedRequest request,
- WrappedResponse response) throws IOException {
- Writer page = response.getWriter();
- WebBrowser b = request.getBrowserDetails().getWebBrowser();
-
- 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();
- }
- }
|
