<?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;
/**
* Representation of an HTTP request.
*/
class Request extends Message implements RequestInterface
{
/**
* IP address of the current user.
*
* @var string
*/
protected $ipAddress = '';
/**
* Proxy IPs
*
* @var string|array
*/
protected $proxyIPs;
/**
* Request method.
*
* @var string
*/
protected $method;
/**
* Stores values we've retrieved from
* PHP globals.
*
* @var array
*/
protected $globals = [];
//--------------------------------------------------------------------
/**
* Constructor.
*
* @param object $config
*/
public function __construct($config)
{
$this->proxyIPs = $config->proxyIPs;
if (empty($this->method))
{
$this->method = $this->getServer('REQUEST_METHOD') ?? 'GET';
}
}
//--------------------------------------------------------------------
/**
* Gets the user's IP address.
*
* @return string IP address
*/
public function getIPAddress(): string
{
if (! empty($this->ipAddress))
{
return $this->ipAddress;
}
$proxy_ips = $this->proxyIPs;
if (! empty($this->proxyIPs) && ! is_array($this->proxyIPs))
{
$proxy_ips = explode(',', str_replace(' ', '', $this->proxyIPs));
}
$this->ipAddress = $this->getServer('REMOTE_ADDR');
if ($proxy_ips)
{
foreach (['HTTP_X_FORWARDED_FOR', 'HTTP_CLIENT_IP', 'HTTP_X_CLIENT_IP', 'HTTP_X_CLUSTER_CLIENT_IP'] as $header)
{
if (($spoof = $this->getServer($header)) !== null)
{
// Some proxies typically list the whole chain of IP
// addresses through which the client has reached us.
// e.g. client_ip, proxy_ip1, proxy_ip2, etc.
sscanf($spoof, '%[^,]', $spoof);
if (! $this->isValidIP($spoof))
{
$spoof = null;
}
else
{
break;
}
}
}
if ($spoof)
{
for ($i = 0, $c = count($proxy_ips); $i < $c; $i ++)
{
// Check if we have an IP address or a subnet
if (strpos($proxy_ips[$i], '/') === false)
{
// An IP address (and not a subnet) is specified.
// We can compare right away.
if ($proxy_ips[$i] === $this->ipAddress)
{
$this->ipAddress = $spoof;
break;
}
continue;
}
// We have a subnet ... now the heavy lifting begins
isset($separator) || $separator = $this->isValidIP($this->ipAddress, 'ipv6') ? ':' : '.';
// If the proxy entry doesn't match the IP protocol - skip it
if (strpos($proxy_ips[$i], $separator) === false)
{
continue;
}
// Convert the REMOTE_ADDR IP address to binary, if needed
if (! isset($ip, $sprintf))
{
if ($separator === ':')
{
// Make sure we're have the "full" IPv6 format
$ip = explode(':', str_replace('::', str_repeat(':', 9 - substr_count($this->ipAddress, ':')), $this->ipAddress
)
);
for ($j = 0; $j < 8; $j ++)
{
$ip[$j] = intval($ip[$j], 16);
}
$sprintf = '%016b%016b%016b%016b%016b%016b%016b%016b';
}
else
{
$ip = explode('.', $this->ipAddress);
$sprintf = '%08b%08b%08b%08b';
}
$ip = vsprintf($sprintf, $ip);
}
// Split the netmask length off the network address
sscanf($proxy_ips[$i], '%[^/]/%d', $netaddr, $masklen);
// Again, an IPv6 address is most likely in a compressed form
if ($separator === ':')
{
$netaddr = explode(':', str_replace('::', str_repeat(':', 9 - substr_count($netaddr, ':')), $netaddr));
for ($i = 0; $i < 8; $i ++)
{
$netaddr[$i] = intval($netaddr[$i], 16);
}
}
else
{
$netaddr = explode('.', $netaddr);
}
// Convert to binary and finally compare
if (strncmp($ip, vsprintf($sprintf, $netaddr), $masklen) === 0)
{
$this->ipAddress = $spoof;
break;
}
}
}
}
if (! $this->isValidIP($this->ipAddress))
{
return $this->ipAddress = '0.0.0.0';
}
return empty($this->ipAddress) ? '' : $this->ipAddress;
}
//--------------------------------------------------------------------
/**
* Validate an IP address
*
* @param string $ip IP Address
* @param string $which IP protocol: 'ipv4' or 'ipv6'
*
* @return boolean
*/
public function isValidIP(string $ip = null, string $which = null): bool
{
switch (strtolower($which))
{
case 'ipv4':
$which = FILTER_FLAG_IPV4;
break;
case 'ipv6':
$which = FILTER_FLAG_IPV6;
break;
default:
$which = null;
break;
}
return (bool) filter_var($ip, FILTER_VALIDATE_IP, $which);
}
//--------------------------------------------------------------------
/**
* Get the request method.
*
* @param boolean $upper Whether to return in upper or lower case.
*
* @return string
*/
public function getMethod(bool $upper = false): string
{
return ($upper) ? strtoupper($this->method) : strtolower($this->method);
}
//--------------------------------------------------------------------
/**
* Sets the request method. Used when spoofing the request.
*
* @param string $method
*
* @return Request
*/
public function setMethod(string $method)
{
$this->method = $method;
return $this;
}
//--------------------------------------------------------------------
/**
* Fetch an item from the $_SERVER array.
*
* @param string|array|null $index Index for item to be fetched from $_SERVER
* @param integer|null $filter A filter name to be applied
* @param null $flags
*
* @return mixed
*/
public function getServer($index = null, $filter = null, $flags = null)
{
return $this->fetchGlobal('server', $index, $filter, $flags);
}
//--------------------------------------------------------------------
/**
* Fetch an item from the $_ENV array.
*
* @param null $index Index for item to be fetched from $_ENV
* @param null $filter A filter name to be applied
* @param null $flags
*
* @return mixed
*/
public function getEnv($index = null, $filter = null, $flags = null)
{
return $this->fetchGlobal('env', $index, $filter, $flags);
}
//--------------------------------------------------------------------
/**
* Allows manually setting the value of PHP global, like $_GET, $_POST, etc.
*
* @param string $method
* @param $value
*
* @return $this
*/
public function setGlobal(string $method, $value)
{
$this->globals[$method] = $value;
return $this;
}
//--------------------------------------------------------------------
/**
* Fetches one or more items from a global, like cookies, get, post, etc.
* Can optionally filter the input when you retrieve it by passing in
* a filter.
*
* If $type is an array, it must conform to the input allowed by the
* filter_input_array method.
*
* http://php.net/manual/en/filter.filters.sanitize.php
*
* @param string $method Input filter constant
* @param string|array|null $index
* @param integer|null $filter Filter constant
* @param mixed $flags
*
* @return mixed
*/
public function fetchGlobal($method, $index = null, $filter = null, $flags = null)
{
$method = strtolower($method);
if (! isset($this->globals[$method]))
{
$this->populateGlobals($method);
}
// Null filters cause null values to return.
if (is_null($filter))
{
$filter = FILTER_DEFAULT;
}
// Return all values when $index is null
if (is_null($index))
{
$values = [];
foreach ($this->globals[$method] as $key => $value)
{
$values[$key] = is_array($value)
? $this->fetchGlobal($method, $key, $filter, $flags)
: filter_var($value, $filter, $flags);
}
return $values;
}
// allow fetching multiple keys at once
if (is_array($index))
{
$output = [];
foreach ($index as $key)
{
$output[$key] = $this->fetchGlobal($method, $key, $filter, $flags);
}
return $output;
}
// Does the index contain array notation?
if (($count = preg_match_all('/(?:^[^\[]+)|\[[^]]*\]/', $index, $matches)) > 1)
{
$value = $this->globals[$method];
for ($i = 0; $i < $count; $i++)
{
$key = trim($matches[0][$i], '[]');
if ($key === '') // Empty notation will return the value as array
{
break;
}
if (isset($value[$key]))
{
$value = $value[$key];
}
else
{
return null;
}
}
}
if (! isset($value))
{
$value = $this->globals[$method][$index] ?? null;
}
// Cannot filter these types of data automatically...
if (is_array($value) || is_object($value) || is_null($value))
{
return $value;
}
return filter_var($value, $filter, $flags);
}
//--------------------------------------------------------------------
/**
* Saves a copy of the current state of one of several PHP globals
* so we can retrieve them later.
*
* @param string $method
*/
protected function populateGlobals(string $method)
{
if (! isset($this->globals[$method]))
{
$this->globals[$method] = [];
}
// Don't populate ENV as it might contain
// sensitive data that we don't want to get logged.
switch($method)
{
case 'get':
$this->globals['get'] = $_GET;
break;
case 'post':
$this->globals['post'] = $_POST;
break;
case 'request':
$this->globals['request'] = $_REQUEST;
break;
case 'cookie':
$this->globals['cookie'] = $_COOKIE;
break;
case 'server':
$this->globals['server'] = $_SERVER;
break;
}
}
}
Jim Parry