/*
* 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.Serializable;
import java.util.Date;
import java.util.Locale;
import java.util.TimeZone;
import com.vaadin.shared.VBrowserDetails;
/**
* Class that provides information about the web browser the user is using.
* Provides information such as browser name and version, screen resolution and
* IP address.
*
* @author Vaadin Ltd.
*/
public class WebBrowser implements Serializable {
private int screenHeight = -1;
private int screenWidth = -1;
private String browserApplication = null;
private Locale locale;
private String address;
private boolean secureConnection;
private int timezoneOffset = 0;
private int rawTimezoneOffset = 0;
private int dstSavings;
private boolean dstInEffect;
private boolean touchDevice;
private VBrowserDetails browserDetails;
private long clientServerTimeDelta;
/**
* Gets the height of the screen in pixels. This is the full screen
* resolution and not the height available for the application.
*
* @return the height of the screen in pixels.
*/
public int getScreenHeight() {
return screenHeight;
}
/**
* Gets the width of the screen in pixels. This is the full screen
* resolution and not the width available for the application.
*
* @return the width of the screen in pixels.
*/
public int getScreenWidth() {
return screenWidth;
}
/**
* Get the browser user-agent string.
*
* @return The raw browser userAgent string
*/
public String getBrowserApplication() {
return browserApplication;
}
/**
* Gets the IP-address of the web browser. If the application is running
* inside a portlet, this method will return null.
*
* @return IP-address in 1.12.123.123 -format
*/
public String getAddress() {
return address;
}
/** Get the default locate of the browser. */
public Locale getLocale() {
return locale;
}
/** Is the connection made using HTTPS? */
public boolean isSecureConnection() {
return secureConnection;
}
/**
* Tests whether the user is using Firefox.
*
* @return true if the user is using Firefox, false if the user is not using
* Firefox or if no information on the browser is present
*/
public boolean isFirefox() {
if (browserDetails == null) {
return false;
}
return browserDetails.isFirefox();
}
/**
* Tests whether the user is using Internet Explorer.
*
* @return true if the user is using Internet Explorer, false if the user is
* not using Internet Explorer or if no information on the browser
* is present
*/
public boolean isIE() {
if (browserDetails == null) {
return false;
}
return browserDetails.isIE();
}
/**
* Tests whether the user is using Edge.
*
* @since 7.5.3
* @return true if the user is using Edge, false if the user is not using
* Edge or if no information on the browser is present
*/
public boolean isEdge() {
if (browserDetails == null) {
return false;
}
return browserDetails.isEdge();
}
/**
* Tests whether the user is using Safari. Note that Chrome on iOS is not
* detected as Safari but as Chrome although the underlying browser engine
* is the same.
*
* @return true if the user is using Safari, false if the user is not using
* Safari or if no information on the browser is present
*/
public boolean isSafari() {
if (browserDetails == null) {
return false;
}
return browserDetails.isSafari();
}
/**
* Tests whether the user is using Opera.
*
* @return true if the user is using Opera, false if the user is not using
* Opera or if no information on the browser is present
*/
public boolean isOpera() {
if (browserDetails == null) {
return false;
}
return browserDetails.isOpera();
}
/**
* Tests whether the user is using Chrome.
*
* @return true if the user is using Chrome, false if the user is not using
* Chrome or if no information on the browser is present
*/
public boolean isChrome() {
if (browserDetails == null) {
return false;
}
return browserDetails.isChrome();
}
/**
* Tests whether the user is using Chrome Frame.
*
* @return true if the user is using Chrome Frame, false if the user is not
* using Chrome or if no information on the browser is present
*/
public boolean isChromeFrame() {
if (browserDetails == null) {
return false;
}
return browserDetails.isChromeFrame();
}
/**
* Tests whether the user's browser is Chrome Frame capable.
*
* @return true if the user can use Chrome Frame, false if the user can not
* or if no information on the browser is present
*/
public boolean isChromeFrameCapable() {
if (browserDetails == null) {
return false;
}
return browserDetails.isChromeFrameCapable();
}
/**
* Gets the major version of the browser the user is using.
*
* <p>
* Note that Internet Explorer in IE7 compatibility mode might return 8 in
* some cases even though it should return 7.
* </p>
*
* @return The major version of the browser or -1 if not known.
*/
public int getBrowserMajorVersion() {
if (browserDetails == null) {
return -1;
}
return browserDetails.getBrowserMajorVersion();
}
/**
* Gets the minor version of the browser the user is using.
*
* @see #getBrowserMajorVersion()
*
* @return The minor version of the browser or -1 if not known.
*/
public int getBrowserMinorVersion() {
if (browserDetails == null) {
return -1;
}
return browserDetails.getBrowserMinorVersion();
}
/**
* Tests whether the user is using Linux.
*
* @return true if the user is using Linux, false if the user is not using
* Linux or if no information on the browser is present
*/
public boolean isLinux() {
return browserDetails.isLinux();
}
/**
* Tests whether the user is using Mac OS X.
*
* @return true if the user is using Mac OS X, false if the user is not
* using Mac OS X or if no information on the browser is present
*/
public boolean isMacOSX() {
return browserDetails.isMacOSX();
}
/**
* Tests whether the user is using Windows.
*
* @return true if the user is using Windows, false if the user is not using
* Windows or if no information on the browser is present
*/
public boolean isWindows() {
return browserDetails.isWindows();
}
/**
* Tests whether the user is using Windows Phone.
*
* @return true if the user is using Windows Phone, false if the user is not
* using Windows Phone or if no information on the browser is
* present
* @since 7.3.2
*/
public boolean isWindowsPhone() {
return browserDetails.isWindowsPhone();
}
/**
* Tests if the browser is run on Android.
*
* @return true if run on Android false if the user is not using Android or
* if no information on the browser is present
*/
public boolean isAndroid() {
return browserDetails.isAndroid();
}
/**
* Tests if the browser is run in iOS.
*
* @return true if run in iOS false if the user is not using iOS or if no
* information on the browser is present
*/
public boolean isIOS() {
return browserDetails.isIOS();
}
/**
* Tests if the browser is run on IPhone.
*
* @return true if run on IPhone false if the user is not using IPhone or if
* no information on the browser is present
* @since 7.3.3
*/
public boolean isIPhone() {
return browserDetails.isIPhone();
}
/**
* Tests if the browser is run on IPad.
*
* @return true if run on IPad false if the user is not using IPad or if no
* information on the browser is present
* @since 7.3.3
*/
public boolean isIPad() {
return browserDetails.isIPad();
}
/**
* Returns the browser-reported TimeZone offset in milliseconds from GMT.
* This includes possible daylight saving adjustments, to figure out which
* TimeZone the user actually might be in, see
* {@link #getRawTimezoneOffset()}.
*
* @see WebBrowser#getRawTimezoneOffset()
* @return timezone offset in milliseconds, 0 if not available
*/
public int getTimezoneOffset() {
return timezoneOffset;
}
/**
* Returns the browser-reported TimeZone offset in milliseconds from GMT
* ignoring possible daylight saving adjustments that may be in effect in
* the browser.
* <p>
* You can use this to figure out which TimeZones the user could actually be
* in by calling {@link TimeZone#getAvailableIDs(int)}.
* </p>
* <p>
* If {@link #getRawTimezoneOffset()} and {@link #getTimezoneOffset()}
* returns the same value, the browser is either in a zone that does not
* currently have daylight saving time, or in a zone that never has daylight
* saving time.
* </p>
*
* @return timezone offset in milliseconds excluding DST, 0 if not available
*/
public int getRawTimezoneOffset() {
return rawTimezoneOffset;
}
/**
* Returns the offset in milliseconds between the browser's GMT TimeZone and
* DST.
*
* @return the number of milliseconds that the TimeZone shifts when DST is
* in effect
*/
public int getDSTSavings() {
return dstSavings;
}
/**
* Returns whether daylight saving time (DST) is currently in effect in the
* region of the browser or not.
*
* @return true if the browser resides at a location that currently is in
* DST
*/
public boolean isDSTInEffect() {
return dstInEffect;
}
/**
* Returns the current date and time of the browser. This will not be
* entirely accurate due to varying network latencies, but should provide a
* close-enough value for most cases. Also note that the returned Date
* object uses servers default time zone, not the clients.
* <p>
* To get the actual date and time shown in the end users computer, you can
* do something like:
*
* <pre>
* WebBrowser browser = ...;
* SimpleTimeZone timeZone = new SimpleTimeZone(browser.getTimezoneOffset(), "Fake client time zone");
* DateFormat format = DateFormat.getDateTimeInstance();
* format.setTimeZone(timeZone);
* myLabel.setValue(format.format(browser.getCurrentDate()));
* </pre>
*
* @return the current date and time of the browser.
* @see #isDSTInEffect()
* @see #getDSTSavings()
* @see #getTimezoneOffset()
*/
public Date getCurrentDate() {
return new Date(new Date().getTime() + clientServerTimeDelta);
}
/**
* @return true if the browser is detected to support touch events
*/
public boolean isTouchDevice() {
return touchDevice;
}
/**
* For internal use by VaadinServlet/VaadinPortlet only. Updates all
* properties in the class according to the given information.
*
* @param sw
* Screen width
* @param sh
* Screen height
* @param tzo
* TimeZone offset in minutes from GMT
* @param rtzo
* raw TimeZone offset in minutes from GMT (w/o DST adjustment)
* @param dstSavings
* the difference between the raw TimeZone and DST in minutes
* @param dstInEffect
* is DST currently active in the region or not?
* @param curDate
* the current date in milliseconds since the epoch
* @param touchDevice
*/
void updateClientSideDetails(String sw, String sh, String tzo, String rtzo,
String dstSavings, String dstInEffect, String curDate,
boolean touchDevice) {
if (sw != null) {
try {
screenHeight = Integer.parseInt(sh);
screenWidth = Integer.parseInt(sw);
} catch (final NumberFormatException e) {
screenHeight = screenWidth = -1;
}
}
if (tzo != null) {
try {
// browser->java conversion: min->ms, reverse sign
timezoneOffset = -Integer.parseInt(tzo) * 60 * 1000;
} catch (final NumberFormatException e) {
timezoneOffset = 0; // default gmt+0
}
}
if (rtzo != null) {
try {
// browser->java conversion: min->ms, reverse sign
rawTimezoneOffset = -Integer.parseInt(rtzo) * 60 * 1000;
} catch (final NumberFormatException e) {
rawTimezoneOffset = 0; // default gmt+0
}
}
if (dstSavings != null) {
try {
// browser->java conversion: min->ms
this.dstSavings = Integer.parseInt(dstSavings) * 60 * 1000;
} catch (final NumberFormatException e) {
this.dstSavings = 0; // default no savings
}
}
if (dstInEffect != null) {
this.dstInEffect = Boolean.parseBoolean(dstInEffect);
}
if (curDate != null) {
try {
long curTime = Long.parseLong(curDate);
clientServerTimeDelta = curTime - new Date().getTime();
} catch (final NumberFormatException e) {
clientServerTimeDelta = 0;
}
}
this.touchDevice = touchDevice;
}
/**
* For internal use by VaadinServlet/VaadinPortlet only. Updates all
* properties in the class according to the given information.
*
* @param request
* the Vaadin request to read the information from
*/
public void updateRequestDetails(VaadinRequest request) {
locale = request.getLocale();
address = request.getRemoteAddr();
secureConnection = request.isSecure();
// Headers are case insensitive according to the specifiation but are
// case sensitive in Weblogic portal...
String agent = request.getHeader("User-Agent");
if (agent != null) {
browserApplication = agent;
browserDetails = new VBrowserDetails(agent);
}
if (request.getParameter("v-sw") != null) {
updateClientSideDetails(request.getParameter("v-sw"),
request.getParameter("v-sh"), request.getParameter("v-tzo"),
request.getParameter("v-rtzo"),
request.getParameter("v-dstd"),
request.getParameter("v-dston"),
request.getParameter("v-curdate"),
request.getParameter("v-td") != null);
}
}
/**
* Checks if the browser is so old that it simply won't work with a Vaadin
* application. Can be used to redirect to an alternative page, show
* alternative content or similar.
*
* When this method returns true chances are very high that the browser
* won't work and it does not make sense to direct the user to the Vaadin
* application.
*
* @return true if the browser won't work, false if not the browser is
* supported or might work
*/
public boolean isTooOldToFunctionProperly() {
if (browserDetails == null) {
// Don't know, so assume it will work
return false;
}
return browserDetails.isTooOldToFunctionProperly();
}
/**
* Checks if the browser supports ECMAScript 6, based on the user agent.
*
* @return <code>true</code> if the browser supports ES6, <code>false</code>
* otherwise.
* @since 8.1
*/
public boolean isEs6Supported() {
if (browserDetails == null) {
// Don't know, so assume no
return false;
}
return browserDetails.isEs6Supported();
}
}