<?php
/**
* CodeIgniter
*
* An open source application development framework for PHP
*
* This content is released under the MIT License (MIT)
*
* Copyright (c) 2014-2019 British Columbia Institute of Technology
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
* @package CodeIgniter
* @author CodeIgniter Dev Team
* @copyright 2014-2019 British Columbia Institute of Technology (https://bcit.ca/)
* @license https://opensource.org/licenses/MIT MIT License
* @link https://codeigniter.com
* @since Version 4.0.0
* @filesource
*/
namespace CodeIgniter\HTTP;
use Config\UserAgents;
/**
* Abstraction for an HTTP user agent
*/
class UserAgent
{
/**
* Current user-agent
*
* @var string
*/
protected $agent = null;
/**
* Flag for if the user-agent belongs to a browser
*
* @var boolean
*/
protected $isBrowser = false;
/**
* Flag for if the user-agent is a robot
*
* @var boolean
*/
protected $isRobot = false;
/**
* Flag for if the user-agent is a mobile browser
*
* @var boolean
*/
protected $isMobile = false;
/**
* Holds the config file contents.
*
* @var \Config\UserAgents
*/
protected $config;
/**
* Current user-agent platform
*
* @var string
*/
protected $platform = '';
/**
* Current user-agent browser
*
* @var string
*/
protected $browser = '';
/**
* Current user-agent version
*
* @var string
*/
protected $version = '';
/**
* Current user-agent mobile name
*
* @var string
*/
protected $mobile = '';
/**
* Current user-agent robot name
*
* @var string
*/
protected $robot = '';
/**
* HTTP Referer
*
* @var mixed
*/
protected $referrer;
//--------------------------------------------------------------------
/**
* Constructor
*
* Sets the User Agent and runs the compilation routine
*
* @param null $config
*/
public function __construct($config = null)
{
if (is_null($config))
{
$this->config = new UserAgents();
}
if (isset($_SERVER['HTTP_USER_AGENT']))
{
$this->agent = trim($_SERVER['HTTP_USER_AGENT']);
$this->compileData();
}
}
//--------------------------------------------------------------------
/**
* Is Browser
*
* @param string $key
*
* @return boolean
*/
public function isBrowser(string $key = null): bool
{
if (! $this->isBrowser)
{
return false;
}
// No need to be specific, it's a browser
if ($key === null)
{
return true;
}
// Check for a specific browser
return (isset($this->config->browsers[$key]) && $this->browser === $this->config->browsers[$key]);
}
//--------------------------------------------------------------------
/**
* Is Robot
*
* @param string $key
*
* @return boolean
*/
public function isRobot(string $key = null): bool
{
if (! $this->isRobot)
{
return false;
}
// No need to be specific, it's a robot
if ($key === null)
{
return true;
}
// Check for a specific robot
return (isset($this->config->robots[$key]) && $this->robot === $this->config->robots[$key]);
}
//--------------------------------------------------------------------
/**
* Is Mobile
*
* @param string $key
*
* @return boolean
*/
public function isMobile(string $key = null): bool
{
if (! $this->isMobile)
{
return false;
}
// No need to be specific, it's a mobile
if ($key === null)
{
return true;
}
// Check for a specific robot
return (isset($this->config->mobiles[$key]) && $this->mobile === $this->config->mobiles[$key]);
}
//--------------------------------------------------------------------
/**
* Is this a referral from another site?
*
* @return boolean
*/
public function isReferral(): bool
{
if (! isset($this->referrer))
{
if (empty($_SERVER['HTTP_REFERER']))
{
$this->referrer = false;
}
else
{
$referer_host = @parse_url($_SERVER['HTTP_REFERER'], PHP_URL_HOST);
$own_host = parse_url(\base_url(), PHP_URL_HOST);
$this->referrer = ($referer_host && $referer_host !== $own_host);
}
}
return $this->referrer;
}
//--------------------------------------------------------------------
/**
* Agent String
*
* @return string
*/
public function getAgentString(): string
{
return $this->agent;
}
//--------------------------------------------------------------------
/**
* Get Platform
*
* @return string
*/
public function getPlatform(): string
{
return $this->platform;
}
//--------------------------------------------------------------------
/**
* Get Browser Name
*
* @return string
*/
public function getBrowser(): string
{
return $this->browser;
}
//--------------------------------------------------------------------
/**
* Get the Browser Version
*
* @return string
*/
public function getVersion(): string
{
return $this->version;
}
//--------------------------------------------------------------------
/**
* Get The Robot Name
*
* @return string
*/
public function getRobot(): string
{
return $this->robot;
}
//--------------------------------------------------------------------
/**
* Get the Mobile Device
*
* @return string
*/
public function getMobile(): string
{
return $this->mobile;
}
//--------------------------------------------------------------------
/**
* Get the referrer
*
* @return string
*/
public function getReferrer(): string
{
return empty($_SERVER['HTTP_REFERER']) ? '' : trim($_SERVER['HTTP_REFERER']);
}
//--------------------------------------------------------------------
/**
* Parse a custom user-agent string
*
* @param string $string
*
* @return void
*/
public function parse(string $string)
{
// Reset values
$this->isBrowser = false;
$this->isRobot = false;
$this->isMobile = false;
$this->browser = '';
$this->version = '';
$this->mobile = '';
$this->robot = '';
// Set the new user-agent string and parse it, unless empty
$this->agent = $string;
if (! empty($string))
{
$this->compileData();
}
}
//--------------------------------------------------------------------
/**
* Compile the User Agent Data
*
* @return void
*/
protected function compileData()
{
$this->setPlatform();
foreach (['setRobot', 'setBrowser', 'setMobile'] as $function)
{
if ($this->$function() === true)
{
break;
}
}
}
//--------------------------------------------------------------------
/**
* Set the Platform
*
* @return boolean
*/
protected function setPlatform(): bool
{
if (is_array($this->config->platforms) && $this->config->platforms)
{
foreach ($this->config->platforms as $key => $val)
{
if (preg_match('|' . preg_quote($key) . '|i', $this->agent))
{
$this->platform = $val;
return true;
}
}
}
$this->platform = 'Unknown Platform';
return false;
}
//--------------------------------------------------------------------
/**
* Set the Browser
*
* @return boolean
*/
protected function setBrowser(): bool
{
if (is_array($this->config->browsers) && $this->config->browsers)
{
foreach ($this->config->browsers as $key => $val)
{
if (preg_match('|' . $key . '.*?([0-9\.]+)|i', $this->agent, $match))
{
$this->isBrowser = true;
$this->version = $match[1];
$this->browser = $val;
$this->setMobile();
return true;
}
}
}
return false;
}
//--------------------------------------------------------------------
/**
* Set the Robot
*
* @return boolean
*/
protected function setRobot(): bool
{
if (is_array($this->config->robots) && $this->config->robots)
{
foreach ($this->config->robots as $key => $val)
{
if (preg_match('|' . preg_quote($key) . '|i', $this->agent))
{
$this->isRobot = true;
$this->robot = $val;
$this->setMobile();
return true;
}
}
}
return false;
}
//--------------------------------------------------------------------
/**
* Set the Mobile Device
*
* @return boolean
*/
protected function setMobile(): bool
{
if (is_array($this->config->mobiles) && $this->config->mobiles)
{
foreach ($this->config->mobiles as $key => $val)
{
if (false !== (stripos($this->agent, $key)))
{
$this->isMobile = true;
$this->mobile = $val;
return true;
}
}
}
return false;
}
//--------------------------------------------------------------------
/**
* Outputs the original Agent String when cast as a string.
*
* @return string
*/
public function __toString(): string
{
return $this->getAgentString();
}
}
Jim Parry