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/*
@VaadinApache2LicenseForJavaFiles@
*/
package com.vaadin.terminal.gwt.server;
import java.io.IOException;
import java.io.Writer;
import com.vaadin.Application;
import com.vaadin.terminal.RequestHandler;
import com.vaadin.terminal.WrappedRequest;
import com.vaadin.terminal.WrappedResponse;
/**
* 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";
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+ " is outdated and not supported.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();
}
}
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