Search moodle.org's
Developer Documentation
Developer Documentation
- Bug fixes for general core bugs in 3.10.x will end 8 November 2021 (12 months).
- Bug fixes for security issues in 3.10.x will end 9 May 2022 (18 months).
- PHP version: minimum PHP 7.2.0 Note: minimum PHP version has increased since Moodle 3.8. PHP 7.3.x and 7.4.x are supported too.
/lib/classes/ -> useragent.php (source)
<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* Environment class to aid with the detection and establishment of the working environment.
*
* @package core
* @copyright 2013 Sam Hemelryk
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
/**
* The user agent class.
*
* It's important to note that we do not like browser sniffing and its use in core code is highly discouraged.
* No new uses of this API will be integrated unless there is absolutely no alternative.
*
* This API supports the few browser checks we do have in core, all of which one day will hopefully be removed.
* The API will remain to support any third party use out there, however at some point like all code it will be deprecated.
*
* Use sparingly and only with good cause!
*
* @package core
* @copyright 2013 Sam Hemelryk
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class core_useragent {
/**
* The default for devices, think of as a computer.
*/
const DEVICETYPE_DEFAULT = 'default';
/**
* Legacy devices, or at least legacy browsers. These are older devices/browsers
* that don't support standards.
*/
const DEVICETYPE_LEGACY = 'legacy';
/**
* Mobile devices like your cell phone or hand held gaming device.
*/
const DEVICETYPE_MOBILE = 'mobile';
/**
* Tables, larger than hand held, but still easily portable and smaller than a laptop.
*/
const DEVICETYPE_TABLET = 'tablet';
/**
* An instance of this class.
* @var core_useragent
*/
protected static $instance = null;
/**
* The device types we track.
* @var array
*/
public static $devicetypes = array(
self::DEVICETYPE_DEFAULT,
self::DEVICETYPE_LEGACY,
self::DEVICETYPE_MOBILE,
self::DEVICETYPE_TABLET,
);
/**
* The current requests user agent string if there was one.
* @var string|bool|null Null until initialised, false if none available, or string when available.
*/
protected $useragent = null;
/**
* The users device type, one of self::DEVICETYPE_*.
* @var string null until initialised
*/
protected $devicetype = null;
/**
< * Custom device types entered into the admin interface.
< * @var array
< */
< protected $devicetypecustoms = array();
<
< /**
* True if the user agent supports the display of svg images. False if not.
* @var bool|null Null until initialised, then true or false.
*/
protected $supportssvg = null;
/**
* Get an instance of the user agent object.
*
* @param bool $reload If set to true the user agent will be reset and all ascertations remade.
* @param string $forceuseragent The string to force as the user agent, don't use unless absolutely unavoidable.
* @return core_useragent
*/
public static function instance($reload = false, $forceuseragent = null) {
if (!self::$instance || $reload) {
self::$instance = new core_useragent($forceuseragent);
}
return self::$instance;
}
/**
* Constructs a new user agent object. Publically you must use the instance method above.
*
* @param string|null $forceuseragent Optional a user agent to force.
*/
protected function __construct($forceuseragent = null) {
< global $CFG;
< if (!empty($CFG->devicedetectregex)) {
< $this->devicetypecustoms = json_decode($CFG->devicedetectregex, true);
< }
< if ($this->devicetypecustoms === null) {
< // This shouldn't happen unless you're hardcoding the config value.
< debugging('Config devicedetectregex is not valid JSON object');
< $this->devicetypecustoms = array();
< }
if ($forceuseragent !== null) {
$this->useragent = $forceuseragent;
} else if (!empty($_SERVER['HTTP_USER_AGENT'])) {
$this->useragent = $_SERVER['HTTP_USER_AGENT'];
} else {
$this->useragent = false;
$this->devicetype = self::DEVICETYPE_DEFAULT;
}
}
/**
* Get the MoodleBot UserAgent for this site.
*
* @return string UserAgent
*/
public static function get_moodlebot_useragent() {
global $CFG;
$version = moodle_major_version(); // Only major version for security.
return "MoodleBot/$version (+{$CFG->wwwroot})";
}
/**
* Returns the user agent string.
* @return bool|string The user agent string or false if one isn't available.
*/
public static function get_user_agent_string() {
$instance = self::instance();
return $instance->useragent;
}
/**
* Returns the device type we believe is being used.
* @return string
*/
public static function get_device_type() {
$instance = self::instance();
if ($instance->devicetype === null) {
return $instance->guess_device_type();
}
return $instance->devicetype;
}
/**
* Guesses the device type the user agent is running on.
*
* @return string
*/
protected function guess_device_type() {
< global $CFG;
< if (empty($CFG->enabledevicedetection)) {
< $this->devicetype = self::DEVICETYPE_DEFAULT;
< return $this->devicetype;
< }
< foreach ($this->devicetypecustoms as $value => $regex) {
< if (preg_match($regex, $this->useragent)) {
< $this->devicetype = $value;
< return $this->devicetype;
< }
< }
if ($this->is_useragent_mobile()) {
$this->devicetype = self::DEVICETYPE_MOBILE;
} else if ($this->is_useragent_tablet()) {
$this->devicetype = self::DEVICETYPE_TABLET;
} else if (self::check_ie_version('0') && !self::check_ie_version('7.0')) {
// IE 6 and before are considered legacy.
$this->devicetype = self::DEVICETYPE_LEGACY;
} else {
$this->devicetype = self::DEVICETYPE_DEFAULT;
}
return $this->devicetype;
}
/**
* Returns true if the user appears to be on a mobile device.
* @return bool
*/
protected function is_useragent_mobile() {
// Mobile detection PHP direct copy from open source detectmobilebrowser.com.
$phonesregex = '/android .+ mobile|avantgo|blackberry|blazer|compal|elaine|fennec|hiptop|iemobile|ip(hone|od)|iris|kindle|lge |maemo|midp|mmp|opera m(ob|in)i|palm( os)?|phone|p(ixi|re)\/|plucker|pocket|psp|symbian|treo|up\.(browser|link)|vodafone|wap|windows (ce|phone)|xda|xiino/i';
$modelsregex = '/1207|6310|6590|3gso|4thp|50[1-6]i|770s|802s|a wa|abac|ac(er|oo|s\-)|ai(ko|rn)|al(av|ca|co)|amoi|an(ex|ny|yw)|aptu|ar(ch|go)|as(te|us)|attw|au(di|\-m|r |s )|avan|be(ck|ll|nq)|bi(lb|rd)|bl(ac|az)|br(e|v)w|bumb|bw\-(n|u)|c55\/|capi|ccwa|cdm\-|cell|chtm|cldc|cmd\-|co(mp|nd)|craw|da(it|ll|ng)|dbte|dc\-s|devi|dica|dmob|do(c|p)o|ds(12|\-d)|el(49|ai)|em(l2|ul)|er(ic|k0)|esl8|ez([4-7]0|os|wa|ze)|fetc|fly(\-|_)|g1 u|g560|gene|gf\-5|g\-mo|go(\.w|od)|gr(ad|un)|haie|hcit|hd\-(m|p|t)|hei\-|hi(pt|ta)|hp( i|ip)|hs\-c|ht(c(\-| |_|a|g|p|s|t)|tp)|hu(aw|tc)|i\-(20|go|ma)|i230|iac( |\-|\/)|ibro|idea|ig01|ikom|im1k|inno|ipaq|iris|ja(t|v)a|jbro|jemu|jigs|kddi|keji|kgt( |\/)|klon|kpt |kwc\-|kyo(c|k)|le(no|xi)|lg( g|\/(k|l|u)|50|54|e\-|e\/|\-[a-w])|libw|lynx|m1\-w|m3ga|m50\/|ma(te|ui|xo)|mc(01|21|ca)|m\-cr|me(di|rc|ri)|mi(o8|oa|ts)|mmef|mo(01|02|bi|de|do|t(\-| |o|v)|zz)|mt(50|p1|v )|mwbp|mywa|n10[0-2]|n20[2-3]|n30(0|2)|n50(0|2|5)|n7(0(0|1)|10)|ne((c|m)\-|on|tf|wf|wg|wt)|nok(6|i)|nzph|o2im|op(ti|wv)|oran|owg1|p800|pan(a|d|t)|pdxg|pg(13|\-([1-8]|c))|phil|pire|pl(ay|uc)|pn\-2|po(ck|rt|se)|prox|psio|pt\-g|qa\-a|qc(07|12|21|32|60|\-[2-7]|i\-)|qtek|r380|r600|raks|rim9|ro(ve|zo)|s55\/|sa(ge|ma|mm|ms|ny|va)|sc(01|h\-|oo|p\-)|sdk\/|se(c(\-|0|1)|47|mc|nd|ri)|sgh\-|shar|sie(\-|m)|sk\-0|sl(45|id)|sm(al|ar|b3|it|t5)|so(ft|ny)|sp(01|h\-|v\-|v )|sy(01|mb)|t2(18|50)|t6(00|10|18)|ta(gt|lk)|tcl\-|tdg\-|tel(i|m)|tim\-|t\-mo|to(pl|sh)|ts(70|m\-|m3|m5)|tx\-9|up(\.b|g1|si)|utst|v400|v750|veri|vi(rg|te)|vk(40|5[0-3]|\-v)|vm40|voda|vulc|vx(52|53|60|61|70|80|81|83|85|98)|w3c(\-| )|webc|whit|wi(g |nc|nw)|wmlb|wonu|x700|xda(\-|2|g)|yas\-|your|zeto|zte\-/i';
return (preg_match($phonesregex, $this->useragent) || preg_match($modelsregex, substr($this->useragent, 0, 4)));
}
/**
* Returns true if the user appears to be on a tablet.
*
* @return int
*/
protected function is_useragent_tablet() {
$tabletregex = '/Tablet browser|android|iPad|iProd|GT-P1000|GT-I9000|SHW-M180S|SGH-T849|SCH-I800|Build\/ERE27|sholest/i';
return (preg_match($tabletregex, $this->useragent));
}
/**
* Whether the user agent relates to a web crawler.
* This includes all types of web crawler.
* @return bool
*/
protected function is_useragent_web_crawler() {
$regex = '/MoodleBot|Googlebot|google\.com|Yahoo! Slurp|\[ZSEBOT\]|msnbot|bingbot|BingPreview|Yandex|AltaVista'
.'|Baiduspider|Teoma/i';
return (preg_match($regex, $this->useragent));
}
/**
* Gets a list of known device types.
*
> * @deprecated Moodle 4.3 MDL-78468 - No longer used. Please use core_useragent::devicetypes instead.
* @param bool $includecustomtypes If set to true we'll include types that have been added by the admin.
> * @todo Final deprecation on Moodle 4.7 MDL-79052
* @return array
*/
public static function get_device_type_list($includecustomtypes = true) {
> debugging(
$types = self::$devicetypes;
> __FUNCTION__ . '() is deprecated.' .
if ($includecustomtypes) {
> 'All functions associated with devicedetectregex theme setting are being removed.
$instance = self::instance();
> Please use core_useragent::devicetypes instead',
$types = array_merge($types, array_keys($instance->devicetypecustoms));
> DEBUG_DEVELOPER
}
> );
return $types;
}
/**
* Returns the theme to use for the given device type.
*
* This used to be get_selected_theme_for_device_type.
* @param null|string $devicetype The device type to find out for. Defaults to the device the user is using,
> * @deprecated since 4.3.
* @return bool
*/
public static function get_device_type_theme($devicetype = null) {
> debugging(
global $CFG;
> __FUNCTION__ . '() is deprecated.' .
if ($devicetype === null) {
> 'All functions associated with device specific themes are being removed.',
$devicetype = self::get_device_type();
> DEBUG_DEVELOPER
}
> );
$themevarname = self::get_device_type_cfg_var_name($devicetype);
if (empty($CFG->$themevarname)) {
return false;
}
return $CFG->$themevarname;
}
/**
* Returns the CFG var used to find the theme to use for the given device.
*
* Used to be get_device_cfg_var_name.
*
* @param null|string $devicetype The device type to find out for. Defaults to the device the user is using,
> * @deprecated since 4.3.
* @return string
*/
public static function get_device_type_cfg_var_name($devicetype = null) {
> debugging(
if ($devicetype == self::DEVICETYPE_DEFAULT || empty($devicetype)) {
> __FUNCTION__ . '() is deprecated.' .
return 'theme';
> 'All functions associated with device specific themes are being removed.',
}
> DEBUG_DEVELOPER
return 'theme' . $devicetype;
> );
}
/**
* Gets the device type the user is currently using.
* @return string
*/
public static function get_user_device_type() {
$device = self::get_device_type();
$switched = get_user_preferences('switchdevice'.$device, false);
if ($switched != false) {
return $switched;
}
return $device;
}
/**
* Switches the device type we think the user is using to what ever was given.
* @param string $newdevice
* @return bool
* @throws coding_exception
*/
public static function set_user_device_type($newdevice) {
$devicetype = self::get_device_type();
if ($newdevice == $devicetype) {
unset_user_preference('switchdevice'.$devicetype);
return true;
} else {
< $devicetypes = self::get_device_type_list();
> $devicetypes = self::$devicetypes;
if (in_array($newdevice, $devicetypes)) {
set_user_preference('switchdevice'.$devicetype, $newdevice);
return true;
}
}
throw new coding_exception('Invalid device type provided to set_user_device_type');
}
/**
* Returns true if the user agent matches the given brand and the version is equal to or greater than that specified.
*
* @param string $brand The branch to check for.
* @param scalar $version The version if we need to find out if it is equal to or greater than that specified.
* @return bool
*/
public static function check_browser_version($brand, $version = null) {
switch ($brand) {
case 'MSIE':
// Internet Explorer.
return self::check_ie_version($version);
case 'Edge':
// Microsoft Edge.
return self::check_edge_version($version);
case 'Firefox':
// Mozilla Firefox browsers.
return self::check_firefox_version($version);
case 'Chrome':
return self::check_chrome_version($version);
case 'Opera':
// Opera.
return self::check_opera_version($version);
case 'Safari':
// Desktop version of Apple Safari browser - no mobile or touch devices.
return self::check_safari_version($version);
case 'Safari iOS':
// Safari on iPhone, iPad and iPod touch.
return self::check_safari_ios_version($version);
case 'WebKit':
// WebKit based browser - everything derived from it (Safari, Chrome, iOS, Android and other mobiles).
return self::check_webkit_version($version);
case 'Gecko':
// Gecko based browsers.
return self::check_gecko_version($version);
case 'WebKit Android':
// WebKit browser on Android.
return self::check_webkit_android_version($version);
case 'Camino':
// OSX browser using Gecke engine.
return self::check_camino_version($version);
}
// Who knows?! doesn't pass anyway.
return false;
}
/**
* Checks the user agent is camino based and that the version is equal to or greater than that specified.
*
* Camino browser is at the end of its life, its no longer being developed or supported, just don't worry about it.
*
* @param string|int $version A version to check for, returns true if its equal to or greater than that specified.
* @return bool
*/
protected static function check_camino_version($version = null) {
// OSX browser using Gecko engine.
$useragent = self::get_user_agent_string();
if ($useragent === false) {
return false;
}
if (strpos($useragent, 'Camino') === false) {
return false;
}
if (empty($version)) {
return true; // No version specified.
}
if (preg_match("/Camino\/([0-9\.]+)/i", $useragent, $match)) {
if (version_compare($match[1], $version) >= 0) {
return true;
}
}
return false;
}
/**
* Checks the user agent is Firefox (of any version).
*
* @return bool true if firefox
*/
public static function is_firefox() {
return self::check_firefox_version();
}
/**
* Checks the user agent is Firefox based and that the version is equal to or greater than that specified.
*
* @param string|int $version A version to check for, returns true if its equal to or greater than that specified.
* @return bool
*/
public static function check_firefox_version($version = null) {
// Mozilla Firefox browsers.
$useragent = self::get_user_agent_string();
if ($useragent === false) {
return false;
}
if (strpos($useragent, 'Firefox') === false && strpos($useragent, 'Iceweasel') === false) {
return false;
}
if (empty($version)) {
return true; // No version specified..
}
if (preg_match("/(Iceweasel|Firefox)\/([0-9\.]+)/i", $useragent, $match)) {
if (version_compare($match[2], $version) >= 0) {
return true;
}
}
return false;
}
/**
* Checks the user agent is Gecko based (of any version).
*
* @return bool true if Gecko based.
*/
public static function is_gecko() {
return self::check_gecko_version();
}
/**
* Checks the user agent is Gecko based and that the version is equal to or greater than that specified.
*
* @param string|int $version A version to check for, returns true if its equal to or greater than that specified.
* @return bool
*/
public static function check_gecko_version($version = null) {
// Gecko based browsers.
// Do not look for dates any more, we expect real Firefox version here.
$useragent = self::get_user_agent_string();
if ($useragent === false) {
return false;
}
if (empty($version)) {
$version = 1;
} else if ($version > 20000000) {
// This is just a guess, it is not supposed to be 100% accurate!
if (preg_match('/^201/', $version)) {
$version = 3.6;
} else if (preg_match('/^200[7-9]/', $version)) {
$version = 3;
} else if (preg_match('/^2006/', $version)) {
$version = 2;
} else {
$version = 1.5;
}
}
if (preg_match("/(Iceweasel|Firefox)\/([0-9\.]+)/i", $useragent, $match)) {
// Use real Firefox version if specified in user agent string.
if (version_compare($match[2], $version) >= 0) {
return true;
}
} else if (preg_match("/Gecko\/([0-9\.]+)/i", $useragent, $match)) {
// Gecko might contain date or Firefox revision, let's just guess the Firefox version from the date.
$browserver = $match[1];
if ($browserver > 20000000) {
// This is just a guess, it is not supposed to be 100% accurate!
if (preg_match('/^201/', $browserver)) {
$browserver = 3.6;
} else if (preg_match('/^200[7-9]/', $browserver)) {
$browserver = 3;
} else if (preg_match('/^2006/', $version)) {
$browserver = 2;
} else {
$browserver = 1.5;
}
}
if (version_compare($browserver, $version) >= 0) {
return true;
}
}
return false;
}
/**
* Checks the user agent is Edge (of any version).
*
* @return bool true if Edge
*/
public static function is_edge() {
return self::check_edge_version();
}
/**
* Check the User Agent for the version of Edge.
*
* @param string|int $version A version to check for, returns true if its equal to or greater than that specified.
* @return bool
*/
public static function check_edge_version($version = null) {
$useragent = self::get_user_agent_string();
if ($useragent === false) {
// No User Agent found.
return false;
}
if (strpos($useragent, 'Edge/') === false) {
// Edge was not found in the UA - this is not Edge.
return false;
}
if (empty($version)) {
// No version to check.
return true;
}
// Find the version.
// Edge versions are always in the format:
// Edge/<version>.<OS build number>
preg_match('%Edge/([\d]+)\.(.*)$%', $useragent, $matches);
// Just to be safe, round the version being tested.
// Edge only uses integer versions - the second component is the OS build number.
$version = round($version);
// Check whether the version specified is >= the version found.
return version_compare($matches[1], $version, '>=');
}
/**
* Checks the user agent is IE (of any version).
*
* @return bool true if internet exporeer
*/
public static function is_ie() {
return self::check_ie_version();
}
/**
* Checks the user agent is IE and returns its main properties:
* - browser version;
* - whether running in compatibility view.
*
* @return bool|array False if not IE, otherwise an associative array of properties.
*/
public static function check_ie_properties() {
// Internet Explorer.
$useragent = self::get_user_agent_string();
if ($useragent === false) {
return false;
}
if (strpos($useragent, 'Opera') !== false) {
// Reject Opera.
return false;
}
// See: http://www.useragentstring.com/pages/Internet%20Explorer/.
if (preg_match("/MSIE ([0-9\.]+)/", $useragent, $match)) {
$browser = $match[1];
// See: http://msdn.microsoft.com/en-us/library/ie/bg182625%28v=vs.85%29.aspx for IE11+ useragent details.
} else if (preg_match("/Trident\/[0-9\.]+/", $useragent) && preg_match("/rv:([0-9\.]+)/", $useragent, $match)) {
$browser = $match[1];
} else {
return false;
}
$compatview = false;
// IE8 and later versions may pretend to be IE7 for intranet sites, use Trident version instead,
// the Trident should always describe the capabilities of IE in any emulation mode.
if ($browser === '7.0' and preg_match("/Trident\/([0-9\.]+)/", $useragent, $match)) {
$compatview = true;
$browser = $match[1] + 4; // NOTE: Hopefully this will work also for future IE versions.
}
$browser = round($browser, 1);
return array(
'version' => $browser,
'compatview' => $compatview
);
}
/**
* Checks the user agent is IE and that the version is equal to or greater than that specified.
*
* @param string|int $version A version to check for, returns true if its equal to or greater than that specified.
* @return bool
*/
public static function check_ie_version($version = null) {
// Internet Explorer.
$properties = self::check_ie_properties();
if (!is_array($properties)) {
return false;
}
// In case of IE we have to deal with BC of the version parameter.
if (is_null($version)) {
$version = 5.5; // Anything older is not considered a browser at all!
}
// IE uses simple versions, let's cast it to float to simplify the logic here.
$version = round($version, 1);
return ($properties['version'] >= $version);
}
/**
* Checks the user agent is IE and that IE is running under Compatibility View setting.
*
* @return bool true if internet explorer runs in Compatibility View mode.
*/
public static function check_ie_compatibility_view() {
// IE User Agent string when in Compatibility View:
// - IE 8: "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; Trident/4.0; ...)".
// - IE 9: "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; Trident/5.0; ...)".
// - IE 10: "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; Trident/6.0; ...)".
// - IE 11: "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.3; Trident/7.0; ...)".
// Refs:
// - http://blogs.msdn.com/b/ie/archive/2009/01/09/the-internet-explorer-8-user-agent-string-updated-edition.aspx.
// - http://blogs.msdn.com/b/ie/archive/2010/03/23/introducing-ie9-s-user-agent-string.aspx.
// - http://blogs.msdn.com/b/ie/archive/2011/04/15/the-ie10-user-agent-string.aspx.
// - http://msdn.microsoft.com/en-us/library/ie/hh869301%28v=vs.85%29.aspx.
$properties = self::check_ie_properties();
if (!is_array($properties)) {
return false;
}
return $properties['compatview'];
}
/**
* Checks the user agent is Opera (of any version).
*
* @return bool true if opera
*/
public static function is_opera() {
return self::check_opera_version();
}
/**
* Checks the user agent is Opera and that the version is equal to or greater than that specified.
*
* @param string|int $version A version to check for, returns true if its equal to or greater than that specified.
* @return bool
*/
public static function check_opera_version($version = null) {
// Opera.
$useragent = self::get_user_agent_string();
if ($useragent === false) {
return false;
}
if (strpos($useragent, 'Opera') === false) {
return false;
}
if (empty($version)) {
return true; // No version specified.
}
// Recent Opera useragents have Version/ with the actual version, e.g.:
// Opera/9.80 (Windows NT 6.1; WOW64; U; en) Presto/2.10.289 Version/12.01
// That's Opera 12.01, not 9.8.
if (preg_match("/Version\/([0-9\.]+)/i", $useragent, $match)) {
if (version_compare($match[1], $version) >= 0) {
return true;
}
} else if (preg_match("/Opera\/([0-9\.]+)/i", $useragent, $match)) {
if (version_compare($match[1], $version) >= 0) {
return true;
}
}
return false;
}
/**
* Checks the user agent is webkit based
*
* @return bool true if webkit
*/
public static function is_webkit() {
return self::check_webkit_version();
}
/**
* Checks the user agent is Webkit based and that the version is equal to or greater than that specified.
*
* @param string|int $version A version to check for, returns true if its equal to or greater than that specified.
* @return bool
*/
public static function check_webkit_version($version = null) {
// WebKit based browser - everything derived from it (Safari, Chrome, iOS, Android and other mobiles).
$useragent = self::get_user_agent_string();
if ($useragent === false) {
return false;
}
if (strpos($useragent, 'AppleWebKit') === false) {
return false;
}
if (empty($version)) {
return true; // No version specified.
}
if (preg_match("/AppleWebKit\/([0-9.]+)/i", $useragent, $match)) {
if (version_compare($match[1], $version) >= 0) {
return true;
}
}
return false;
}
/**
* Checks the user agent is Safari
*
* @return bool true if safari
*/
public static function is_safari() {
return self::check_safari_version();
}
/**
* Checks the user agent is Safari based and that the version is equal to or greater than that specified.
*
* @param string|int $version A version to check for, returns true if its equal to or greater than that specified.
* @return bool
*/
public static function check_safari_version($version = null) {
// Desktop version of Apple Safari browser - no mobile or touch devices.
$useragent = self::get_user_agent_string();
if ($useragent === false) {
return false;
}
if (strpos($useragent, 'AppleWebKit') === false) {
return false;
}
// Look for AppleWebKit, excluding strings with OmniWeb, Shiira and SymbianOS and any other mobile devices.
if (strpos($useragent, 'OmniWeb')) {
// Reject OmniWeb.
return false;
}
if (strpos($useragent, 'Shiira')) {
// Reject Shiira.
return false;
}
if (strpos($useragent, 'SymbianOS')) {
// Reject SymbianOS.
return false;
}
if (strpos($useragent, 'Android')) {
// Reject Androids too.
return false;
}
if (strpos($useragent, 'iPhone') or strpos($useragent, 'iPad') or strpos($useragent, 'iPod')) {
// No Apple mobile devices here - editor does not work, course ajax is not touch compatible, etc.
return false;
}
if (strpos($useragent, 'Chrome')) {
// Reject chrome browsers - it needs to be tested explicitly.
// This will also reject Edge, which pretends to be both Chrome, and Safari.
return false;
}
if (empty($version)) {
return true; // No version specified.
}
if (preg_match("/AppleWebKit\/([0-9.]+)/i", $useragent, $match)) {
if (version_compare($match[1], $version) >= 0) {
return true;
}
}
return false;
}
/**
* Checks the user agent is Chrome
*
* @return bool true if chrome
*/
public static function is_chrome() {
return self::check_chrome_version();
}
/**
* Checks the user agent is Chrome based and that the version is equal to or greater than that specified.
*
* @param string|int $version A version to check for, returns true if its equal to or greater than that specified.
* @return bool
*/
public static function check_chrome_version($version = null) {
// Chrome.
$useragent = self::get_user_agent_string();
if ($useragent === false) {
return false;
}
if (strpos($useragent, 'Chrome') === false) {
return false;
}
if (empty($version)) {
return true; // No version specified.
}
if (preg_match("/Chrome\/(.*)[ ]+/i", $useragent, $match)) {
if (version_compare($match[1], $version) >= 0) {
return true;
}
}
return false;
}
/**
* Checks the user agent is webkit android based.
*
* @return bool true if webkit based and on Android
*/
public static function is_webkit_android() {
return self::check_webkit_android_version();
}
/**
* Checks the user agent is Webkit based and on Android and that the version is equal to or greater than that specified.
*
* @param string|int $version A version to check for, returns true if its equal to or greater than that specified.
* @return bool
*/
public static function check_webkit_android_version($version = null) {
// WebKit browser on Android.
$useragent = self::get_user_agent_string();
if ($useragent === false) {
return false;
}
if (strpos($useragent, 'Android') === false) {
return false;
}
if (empty($version)) {
return true; // No version specified.
}
if (preg_match("/AppleWebKit\/([0-9]+)/i", $useragent, $match)) {
if (version_compare($match[1], $version) >= 0) {
return true;
}
}
return false;
}
/**
* Checks the user agent is Safari on iOS
*
* @return bool true if Safari on iOS
*/
public static function is_safari_ios() {
return self::check_safari_ios_version();
}
/**
* Checks the user agent is Safari on iOS and that the version is equal to or greater than that specified.
*
* @param string|int $version A version to check for, returns true if its equal to or greater than that specified.
* @return bool
*/
public static function check_safari_ios_version($version = null) {
// Safari on iPhone, iPad and iPod touch.
$useragent = self::get_user_agent_string();
if ($useragent === false) {
return false;
}
if (strpos($useragent, 'AppleWebKit') === false or strpos($useragent, 'Safari') === false) {
return false;
}
if (!strpos($useragent, 'iPhone') and !strpos($useragent, 'iPad') and !strpos($useragent, 'iPod')) {
return false;
}
if (empty($version)) {
return true; // No version specified.
}
if (preg_match("/AppleWebKit\/([0-9]+)/i", $useragent, $match)) {
if (version_compare($match[1], $version) >= 0) {
return true;
}
}
return false;
}
/**
* Checks if the user agent is MS Word.
* Not perfect, as older versions of Word use standard IE6/7 user agents without any identifying traits.
*
* @return bool true if user agent could be identified as MS Word.
*/
public static function is_msword() {
$useragent = self::get_user_agent_string();
if (!preg_match('/(\bWord\b|ms-office|MSOffice|Microsoft Office)/i', $useragent)) {
return false;
} else if (strpos($useragent, 'Outlook') !== false) {
return false;
} else if (strpos($useragent, 'Meridio') !== false) {
return false;
}
// It's Office, not Outlook and not Meridio - so it's probably Word, but we can't really be sure in most cases.
return true;
}
/**
* Check if the user agent matches a given brand.
*
* Known brand: 'Windows','Linux','Macintosh','SGI','SunOS','HP-UX'
*
* @param string $brand
* @return bool
*/
public static function check_browser_operating_system($brand) {
$useragent = self::get_user_agent_string();
return ($useragent !== false && preg_match("/$brand/i", $useragent));
}
/**
* Gets an array of CSS classes to represent the user agent.
* @return array
*/
public static function get_browser_version_classes() {
$classes = array();
if (self::is_edge()) {
$classes[] = 'edge';
} else if (self::is_ie()) {
$classes[] = 'ie';
for ($i = 12; $i >= 6; $i--) {
if (self::check_ie_version($i)) {
$classes[] = 'ie'.$i;
break;
}
}
} else if (self::is_firefox() || self::is_gecko() || self::check_camino_version()) {
$classes[] = 'gecko';
if (preg_match('/rv\:([1-2])\.([0-9])/', self::get_user_agent_string(), $matches)) {
$classes[] = "gecko{$matches[1]}{$matches[2]}";
}
} else if (self::is_chrome()) {
$classes[] = 'chrome';
if (self::is_webkit_android()) {
$classes[] = 'android';
}
} else if (self::is_webkit()) {
if (self::is_safari()) {
$classes[] = 'safari';
}
if (self::is_safari_ios()) {
$classes[] = 'ios';
} else if (self::is_webkit_android()) {
$classes[] = 'android'; // Old pre-Chrome android browsers.
}
} else if (self::is_opera()) {
$classes[] = 'opera';
}
return $classes;
}
/**
* Returns true if the user agent supports the display of SVG images.
*
* @return bool
*/
public static function supports_svg() {
< // IE 5 - 8 don't support SVG at all.
$instance = self::instance();
if ($instance->supportssvg === null) {
< if ($instance->useragent === false) {
< // Can't be sure, just say no.
< $instance->supportssvg = false;
< } else if (self::check_ie_version('0') and !self::check_ie_version('9')) {
< // IE < 9 doesn't support SVG. Say no.
< $instance->supportssvg = false;
< } else if (self::is_ie() and !self::check_ie_version('10') and self::check_ie_compatibility_view()) {
< // IE 9 Compatibility View doesn't support SVG. Say no.
< $instance->supportssvg = false;
< } else if (preg_match('#Android +[0-2]\.#', $instance->useragent)) {
< // Android < 3 doesn't support SVG. Say no.
< $instance->supportssvg = false;
< } else if (self::is_opera()) {
< // Opera 12 still does not support SVG well enough. Say no.
> if (preg_match('#Android +[0-2]\.#', $instance->useragent)) {
> // Android < 3 doesn't support SVG.
$instance->supportssvg = false;
} else {
< // Presumed fine.
> // With widespread SVG support in modern browsers, default to returning true (even when useragent is false).
$instance->supportssvg = true;
}
}
return $instance->supportssvg;
}
/**
* Returns true if the user agent supports the MIME media type for JSON text, as defined in RFC 4627.
*
* @return bool
*/
public static function supports_json_contenttype() {
// Modern browsers other than IE correctly supports 'application/json' media type.
if (!self::check_ie_version('0')) {
return true;
}
// IE8+ supports 'application/json' media type, when NOT in Compatibility View mode.
// Refs:
// - http://blogs.msdn.com/b/ie/archive/2008/09/10/native-json-in-ie8.aspx;
// - MDL-39810: issues when using 'text/plain' in Compatibility View for the body of an HTTP POST response.
if (self::check_ie_version(8) && !self::check_ie_compatibility_view()) {
return true;
}
// This browser does not support json.
return false;
}
/**
* Returns true if the client appears to be some kind of web crawler.
* This may include other types of crawler.
*
* @return bool
*/
public static function is_web_crawler() {
$instance = self::instance();
return (bool) $instance->is_useragent_web_crawler();
}
/**
* Returns true if the client appears to be a device using iOS (iPhone, iPad, iPod).
*
* @param scalar $version The version if we need to find out if it is equal to or greater than that specified.
* @return bool true if the client is using iOS
* @since Moodle 3.2
*/
public static function is_ios($version = null) {
$useragent = self::get_user_agent_string();
if ($useragent === false) {
return false;
}
if (strpos($useragent, 'AppleWebKit') === false) {
return false;
}
if (strpos($useragent, 'Windows')) {
// Reject Windows Safari.
return false;
}
if (strpos($useragent, 'Macintosh')) {
// Reject MacOS Safari.
return false;
}
// Look for AppleWebKit, excluding strings with OmniWeb, Shiira and SymbianOS and any other mobile devices.
if (strpos($useragent, 'OmniWeb')) {
// Reject OmniWeb.
return false;
}
if (strpos($useragent, 'Shiira')) {
// Reject Shiira.
return false;
}
if (strpos($useragent, 'SymbianOS')) {
// Reject SymbianOS.
return false;
}
if (strpos($useragent, 'Android')) {
// Reject Androids too.
return false;
}
if (strpos($useragent, 'Chrome')) {
// Reject chrome browsers - it needs to be tested explicitly.
// This will also reject Edge, which pretends to be both Chrome, and Safari.
return false;
}
if (empty($version)) {
return true; // No version specified.
}
if (preg_match("/AppleWebKit\/([0-9.]+)/i", $useragent, $match)) {
if (version_compare($match[1], $version) >= 0) {
return true;
}
}
return false;
}
/**
* Returns true if the client appears to be the Moodle app (or an app based on the Moodle app code).
*
* @return bool true if the client is the Moodle app
* @since Moodle 3.7
*/
public static function is_moodle_app() {
$useragent = self::get_user_agent_string();
// Make it case insensitive, things can change in the app or desktop app depending on the platform frameworks.
if (stripos($useragent, 'MoodleMobile') !== false) {
return true;
}
return false;
}
/**
* Checks if current browser supports files with give extension as <video> or <audio> source
*
* Note, the check here is not 100% accurate!
*
* First, we do not know which codec is used in .mp4 or .webm files. Not all browsers support
* all codecs.
*
* Also we assume that users of Firefox/Chrome/Safari do not use the ancient versions of browsers.
*
* We check the exact version for IE/Edge though. We know that there are still users of very old
* versions that are afraid to upgrade or have slow IT department.
*
* Resources:
* https://developer.mozilla.org/en-US/docs/Web/HTML/Supported_media_formats
* https://en.wikipedia.org/wiki/HTML5_video
* https://en.wikipedia.org/wiki/HTML5_Audio
*
* @param string $extension extension without leading .
* @return bool
*/
public static function supports_html5($extension) {
$extension = strtolower($extension);
$supportedvideo = array('m4v', 'webm', 'ogv', 'mp4', 'mov', 'fmp4');
$supportedaudio = array('ogg', 'oga', 'aac', 'm4a', 'mp3', 'wav', 'flac');
// Basic extension support.
if (!in_array($extension, $supportedvideo) && !in_array($extension, $supportedaudio)) {
return false;
}
// MS IE support - version 9.0 or later.
if (self::is_ie() && !self::check_ie_version('9.0')) {
return false;
}
// MS Edge support - version 12.0 for desktop and 13.0 for mobile.
if (self::is_edge()) {
if (!self::check_edge_version('12.0')) {
return false;
}
if (self::instance()->is_useragent_mobile() && !self::check_edge_version('13.0')) {
return false;
}
}
// Different exceptions.
// Webm is not supported in IE, Edge and in Safari.
if ($extension === 'webm' &&
(self::is_ie() || self::is_edge() || self::is_safari() || self::is_safari_ios())) {
return false;
}
// Ogg is not supported in IE, Edge and Safari.
$isogg = in_array($extension, ['ogg', 'oga', 'ogv']);
if ($isogg && (self::is_ie() || self::is_edge() || self::is_safari() || self::is_safari_ios())) {
return false;
}
// FLAC is not supported in IE and Edge (below 16.0).
if ($extension === 'flac' &&
(self::is_ie() || (self::is_edge() && !self::check_edge_version('16.0')))) {
return false;
}
// Wave is not supported in IE.
if ($extension === 'wav' && self::is_ie()) {
return false;
}
// Aac is not supported in IE below 11.0.
if ($extension === 'aac' && (self::is_ie() && !self::check_ie_version('11.0'))) {
return false;
}
// Mpeg is not supported in IE below 10.0.
$ismpeg = in_array($extension, ['m4a', 'mp3', 'm4v', 'mp4', 'fmp4']);
if ($ismpeg && (self::is_ie() && !self::check_ie_version('10.0'))) {
return false;
}
// Mov is not supported in IE.
if ($extension === 'mov' && self::is_ie()) {
return false;
}
return true;
}
/**
* Checks if current browser supports the HLS and MPEG-DASH media
* streaming formats. Most browsers get this from Media Source Extensions.
* Safari on iOS, doesn't support MPEG-DASH at all.
*
* Note, the check here is not 100% accurate!
*
* Also we assume that users of Firefox/Chrome/Safari do not use the ancient versions of browsers.
* We check the exact version for IE/Edge though. We know that there are still users of very old
* versions that are afraid to upgrade or have slow IT department.
*
* Resources:
* https://developer.mozilla.org/en-US/docs/Web/API/Media_Source_Extensions_API
* https://caniuse.com/#search=mpeg-dash
* https://caniuse.com/#search=hls
*
* @param string $extension
* @return bool
*/
public static function supports_media_source_extensions(string $extension) : bool {
// Not supported in IE below 11.0.
if (self::is_ie() && !self::check_ie_version('11.0')) {
return false;
}
if ($extension == '.mpd') {
// Not supported in Safari on iOS.
if (self::is_safari_ios()) {
return false;
}
}
return true;
}
}
