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CI framework source code reading---------Input.php_PHP tutorial
CI framework source code reading---------Input.php_PHP tutorial
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/**
* CodeIgniter
*
* An open source application development framework for PHP 5.1.6 or newer
*
* @package CodeIgniter
* @author ExpressionEngine Dev Team
* @copyright Copyright (c) 2008 - 2011, EllisLab, Inc.
* @license http://codeigniter.com/user_guide/license.html
* @link http://codeigniter.com
* @since Version 1.0
* @filesource
*/
// ------------------------------------------------------------------------
/**
* Input Class
*
* Pre-processes global input data for security
*
* @package CodeIgniter
* @subpackage Libraries
* @category Input
* @author ExpressionEngine Dev Team
* @link http://codeigniter.com/user_guide/libraries/input.html
*/
class CI_Input {
/**
* IP address of the current user
* Current user’s IP address
* @var string
*/
var $ip_address = FALSE;
/**
* user agent (web browser) being used by the current user
* Current user (web browser) proxy
* @var string
*/
var $user_agent = FALSE;
/**
* If FALSE, then $_GET will be set to an empty array
* If FALSE, $_GET will be set to an empty array
* @var bool
*/
var $_allow_get_array = TRUE;
/**
* If TRUE, then newlines are standardized
* If TRUR, new lines will be normalized
*
* @var bool
*/
var $_standardize_newlines = TRUE;
/**
* Determines whether the XSS filter is always active when GET, POST or COOKIE data is encountered
* Set automatically based on config setting
* Determine whether to always perform XSS filtering in GET, POST, COOKIE data
* Configure whether to turn it on automatically in the configuration options
*
* @var bool
*/
var $_enable_xss = FALSE;
/**
* Enables a CSRF cookie token to be set.
* Set automatically based on config setting
* 允许CSRF cookie令牌
*
* @var bool
*/
var $_enable_csrf = FALSE;
/**
* List of all HTTP request headers
* List of HTTP request headers
* @var array
*/
protected $headers = array();
/**
* Constructor
* 设置是否全局允许XSS处理和是否允许使用$_GET数组
* Sets whether to globally enable the XSS processing
* and whether to allow the $_GET array
*
* @return void
*/
public function __construct()
{
log_message('debug', "Input Class Initialized");
// Get from the configuration file whether to globally allow $_GET XSS filtering and csrf protection
$this->_allow_get_array = (config_item('allow_get_array') === TRUE);
$this->_enable_xss = (config_item('global_xss_filtering') === TRUE);
$this->_enable_csrf = (config_item('csrf_protection') === TRUE);
// Clear the globals variable. When globals_register is turned on, it is equivalent to turning off this configuration.
// Open a security protection
global $SEC;
$this->security =& $SEC;
// Do we need the UTF-8 class?
if (UTF8_ENABLED === TRUE)
{
global $UNI;
$this->uni =& $UNI;
} }
// Sanitize global arrays
$this->_sanitize_globals();
}
//------------------------------------------------ -----------------------
/**
* Fetch from array
* Get the value from $array, if xss_clean is set then filter it
* This is a helper function to retrieve retrieve values from global arrays
* This is a helper function used to retrieve from the global array
*
* @access private
* @param array
* @param string
* @param bool
* @return string
*/
function _fetch_from_array(&$array, $index = '', $xss_clean = FALSE)
{
if ( ! isset($array[$index]))
{
return FALSE;
} }
if ($xss_clean === TRUE)
{
Return $ This-& GT; Security-& GT; XSS_CLEAN ($ Array [$ Index]);
} }
return $array[$index];
}
//------------------------------------------------ -----------------------
/**
* Fetch an item from the GET array
* Get the filtered GET array
* @access public
* @param string
* @param bool
* @return string
*/
function get($index = NULL, $xss_clean = FALSE)
{
// Check if a field has been provided
// Check if a field has been provided
if ($index === NULL AND ! emptyempty($_GET))
{
$get = array();
// loop through the full _GET array
// 遍历_GET数组
foreach (array_keys($_GET) as $key)
{
$get[$key] = $this->_fetch_from_array($_GET, $key, $xss_clean);
}
return $get;
}
return $this->_fetch_from_array($_GET, $index, $xss_clean);
}
// --------------------------------------------------------------------
/**
* Fetch an item from the POST array
* Get the filtered $_POST value
* @access public
* @param string
* @param bool
* @return string
*/
function post($index = NULL, $xss_clean = FALSE)
{
// Check if a field has been provided
if ($index === NULL AND ! emptyempty($_POST))
{
$post = array();
// Loop through the full _POST array and return it
foreach (array_keys($_POST) as $key)
{
$post[$key] = $this->_fetch_from_array($_POST, $key, $xss_clean);
}
return $post;
}
return $this->_fetch_from_array($_POST, $index, $xss_clean);
}
// --------------------------------------------------------------------
/**
* Fetch an item from either the GET array or the POST
* 从get和post中获取值， post优先
* @access public
* @param string The index key
* @param bool XSS cleaning
* @return string
*/
function get_post($index = '', $xss_clean = FALSE)
{
if ( ! isset($_POST[$index]) )
{
return $this->get($index, $xss_clean);
}
else
{
return $this->post($index, $xss_clean);
}
}
// --------------------------------------------------------------------
/**
* Fetch an item from the COOKIE array
* Return the filtered COOKIE value
* @access public
* @param string
* @param bool
* @return string
*/
function cookie($index = '', $xss_clean = FALSE)
{
return $this->_fetch_from_array($_COOKIE, $index, $xss_clean);
}
// ------------------------------------------------------------------------
/**
* Set cookie
*
* Accepts six parameters, or you can submit an associative
* array in the first parameter containing all the values.
* Receive 6 parameters or receive an associative array containing all values
* @access public
* @param mixed
* @param string the value of the cookie
* @param string the number of seconds until expiration
* @param string the cookie domain. Usually: .yourdomain.com
* @param string the cookie path
* @param string the cookie prefix
* @param bool true makes the cookie secure
* @return void
*/
function set_cookie($name = '', $value = '', $expire = '', $domain = '', $path = '/', $prefix = '', $secure = FALSE)
{
// If the first value is an array, assign the values in the array to the remaining parameters
if (is_array($name))
{
if (isset($name[$item]))
/**
* Fetch an item from the SERVER array
* Returns the filtered $_SERVER value
* @access public
* @param string
* @param bool
* @return string
*/
function server($index = '', $xss_clean = FALSE)
{
return $this->_fetch_from_array($_SERVER, $index, $xss_clean);
}
// --------------------------------------------------------------------
/**
* Fetch the IP Address
* Return the IP of the current user. If the IP address is invalid, return the IP of 0.0.0.0:
* @return string
*/
public function ip_address()
{
// 如果已经有了ip_address 则返回
if ($this->ip_address !== FALSE)
{
return $this->ip_address;
}
$proxy_ips = config_item('proxy_ips');
if ( ! emptyempty($proxy_ips))
{
$proxy_ips = explode(',', str_replace(' ', '', $proxy_ips));
foreach (array('HTTP_X_FORWARDED_FOR', 'HTTP_CLIENT_IP', 'HTTP_X_CLIENT_IP', 'HTTP_X_CLUSTER_CLIENT_IP') as $header)
{
if (($spoof = $this->server($header)) !== FALSE)
{
// 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.
if (strpos($spoof, ',') !== FALSE)
{
$spoof = explode(',', $spoof, 2);
$spoof = $spoof[0];
}
if ( ! $this->valid_ip($spoof))
{
$spoof = FALSE;
}
else
{
break;
}
}
}
$this->ip_address = ($spoof !== FALSE && in_array($_SERVER['REMOTE_ADDR'], $proxy_ips, TRUE))
? $spoof : $_SERVER['REMOTE_ADDR'];
}
else
{
$this->ip_address = $_SERVER['REMOTE_ADDR'];
}
if ( ! $this->valid_ip($this->ip_address))
{
$this->ip_address = '0.0.0.0';
}
return $this->ip_address;
}
// --------------------------------------------------------------------
/**
* Validate IP Address
* Test whether the entered IP address is valid and return a Boolean value TRUE or FALSE.
* Note: $this->input->ip_address() automatically tests whether the format of the entered IP address itself is valid.
* @access public
* @param string
* @param string ipv4 or ipv6
* @return bool
*/
public function valid_ip($ip, $which = '')
{
$which = strtolower($which);
// First check if filter_var is available
if (is_callable('filter_var'))
{
switch ($which) {
case 'ipv4':
$flag = FILTER_FLAG_IPV4;
break;
case 'ipv6':
$flag = FILTER_FLAG_IPV6;
break;
default:
$flag = '';
break;
}
return (bool) filter_var($ip, FILTER_VALIDATE_IP, $flag);
}
if ($which !== 'ipv6' && $which !== 'ipv4')
{
if (strpos($ip, ':') !== FALSE)
{
$which = 'ipv6';
}
elseif (strpos($ip, '.') !== FALSE)
{
$which = 'ipv4';
}
else
{
return FALSE;
}
}
$func = '_valid_'.$which;
return $this->$func($ip);
}
// --------------------------------------------------------------------
/**
* Validate IPv4 Address
* 验证ipv4地址
* Updated version suggested by Geert De Deckere
*
* @access protected
* @param string
* @return bool
*/
protected function _valid_ipv4($ip)
{
$ip_segments = explode('.', $ip);
// Always 4 segments needed
if (count($ip_segments) !== 4)
{
return FALSE;
}
// IP can not start with 0
if ($ip_segments[0][0] == '0')
{
return FALSE;
}
// Check each segment
foreach ($ip_segments as $segment)
{
// IP segments must be digits and can not be
// longer than 3 digits or greater then 255
if ($segment == '' OR preg_match("/[^0-9]/", $segment) OR $segment > 255 OR strlen($segment) > 3)
{
return FALSE;
}
}
return TRUE;
}
// --------------------------------------------------------------------
/**
* Validate IPv6 Address
* Verify ipv6 address
* @access protected
* @param string
* @return bool
*/
protected function _valid_ipv6($str)
{
// 8 groups, separated by :
// 0-ffff per group
// one set of consecutive 0 groups can be collapsed to ::
$groups = 8;
$collapsed = FALSE;
$chunks = array_filter(
preg_split('/(:{1,2})/', $str, NULL, PREG_SPLIT_DELIM_CAPTURE)
);
// Rule out easy nonsense
if (current($chunks) == ':' OR end($chunks) == ':')
{
return FALSE;
}
// PHP supports IPv4-mapped IPv6 addresses, so we'll expect those as well
if (strpos(end($chunks), '.') !== FALSE)
{
$ipv4 = array_pop($chunks);
if ( ! $this->_valid_ipv4($ipv4))
{
return FALSE;
}
$groups--;
}
while ($seg = array_pop($chunks))
{
if ($seg[0] == ':')
{
if (--$groups == 0)
{
return FALSE; // too many groups
}
if (strlen($seg) > 2)
{
return FALSE; // long separator
}
if ($seg == '::')
{
if ($collapsed)
{
return FALSE; // multiple collapsed
}
$collapsed = TRUE;
}
}
elseif (preg_match("/[^0-9a-f]/i", $seg) OR strlen($seg) > 4)
{
return FALSE; // invalid segment
}
}
return $collapsed OR $groups == 1;
}
// --------------------------------------------------------------------
/**
* User Agent
* Returns the user agent information of the browser currently used by the user. If the data cannot be obtained, return FALSE.
* Generally, when user_agent is empty, it is considered to be mobile access, or crawling by curl, or spider crawling
* @access public
* @return string
*/
function user_agent()
{
if ($this->user_agent !== FALSE)
{
return $this->user_agent;
}
$this->user_agent = ( ! isset($_SERVER['HTTP_USER_AGENT'])) ? FALSE : $_SERVER['HTTP_USER_AGENT'];
return $this->user_agent;
}
// --------------------------------------------------------------------
/**
* Sanitize Globals
* Clean up the global array
* This function does the following:
* This function does the following operations:
* Unsets $_GET data (if query strings are not enabled)
* Destroy $_GET (if query strings is not enabled)
* Unsets all globals if register_globals is enabled
* Destroy all global arrays if register_globals is turned on
*
* Standardizes newline characters to n
* Standardized newline character n
* @access private
* @return void
*/
function _sanitize_globals()
{
// It would be "wrong" to unset any of these GLOBALS.
// 销毁下面的全局数组将是错误的。
$protected = array('_SERVER', '_GET', '_POST', '_FILES', '_REQUEST',
'_Session', '_env', 'Globals', 'http_raw_post_data',
// Unset globals for securiy. In order to safely destroy the global array except the above
// This is effectively the same as register_globals = off
// This effect is the same as register_globals
// After the following processing, all non-protected global variables will be deleted
foreach (array($_GET, $_POST, $_COOKIE) as $global)
{
if ( ! is_array($global))
foreach ($global as $key => $val)
}
}
} }
// Is $_GET data allowed? If not we'll set the $_GET to an empty array
// Is $_GET data allowed? If not allowed, set $_GET to an empty array
if ($this->_allow_get_array == FALSE)
{
$_GET = array();
} }
else
{
if (is_array($_GET) AND count($_GET) > 0)
$_GET[$this->_clean_input_keys($key)] = $this->_clean_input_data($val);
}
}
} }
// Clean $_POST Data
// Filter $_POST array
if (is_array($_POST) AND count($_POST) > 0)
{
foreach ($_POST as $key => $val)
}
}
// Clean $_COOKIE Data
// 过滤$_COOKIE数组
if (is_array($_COOKIE) AND count($_COOKIE) > 0)
{
// Also get rid of specially treated cookies that might be set by a server
// or silly application, that are of no use to a CI application anyway
// but that when present will trip our 'Disallowed Key Characters' alarm
// http://www.ietf.org/rfc/rfc2109.txt
// note that the key names below are single quoted strings, and are not PHP variables
unset($_COOKIE['$Version']);
unset($_COOKIE['$Path']);
unset($_COOKIE['$Domain']);
foreach ($_COOKIE as $key => $val)
{
$_COOKIE[$this->_clean_input_keys($key)] = $this->_clean_input_data($val);
}
}
// Sanitize PHP_SELF
$_SERVER['PHP_SELF'] = strip_tags($_SERVER['PHP_SELF']);
// CSRF Protection check on HTTP requests
// ＣＳＲＦ保护检测http请求
if ($this->_enable_csrf == TRUE && ! $this->is_cli_request())
{
$this->security->csrf_verify();
}
log_message('debug', "Global POST and COOKIE data sanitized");
}
// --------------------------------------------------------------------
/**
* Clean Input Data
* 过滤input数据
* This is a helper function. It escapes data and
* standardizes newline characters to n
*
* @access private
* @param string
* @return string
*/
function _clean_input_data($str)
{
if (is_array($str))
{
$new_array = array();
foreach ($str as $key => $val)
{
$new_array[$this->_clean_input_keys($key)] = $this->_clean_input_data($val);
}
return $new_array;
}
/* We strip slashes if magic quotes is on to keep things consistent
如果小于PHP5.4版本，并且get_magic_quotes_gpc开启了，则去掉斜线。
NOTE: In PHP 5.4 get_magic_quotes_gpc() will always return 0 and
it will probably not exist in future versions at all。
注意：在PHP5.4及之后版本，get_magic_quotes_gpc()将总是返回0，
This feature may be removed in subsequent versions
*/
if ( ! is_php('5.4') && get_magic_quotes_gpc())
{
$str = stripslashes($str);
} }
// Clean UTF-8 if supported If supported, clean utf8
if (UTF8_ENABLED === TRUE)
{
$str = $this->uni->clean_string($str);
} }
// Remove control characters
$str = remove_invisible_characters($str);
// Should we filter the input data?
if ($this->_enable_xss === TRUE)
{
$str = $this->security->xss_clean($str);
} }
// Standardize newlines if needed
if ($this->_standardize_newlines == TRUE)
{
if (strpos($str, "r") !== FALSE)
{
$headers = apache_request_headers();
}
else
{
$headers['Content-Type'] = (isset($_SERVER['CONTENT_TYPE'])) ? $_SERVER['CONTENT_TYPE'] : @getenv('CONTENT_TYPE');
foreach ($_SERVER as $key => $val)
{
if (strncmp($key, 'HTTP_', 5) === 0)
{
$headers[substr($key, 5)] = $this->_fetch_from_array($_SERVER, $key, $xss_clean);
}
}
}
// take SOME_HEADER and turn it into Some-Header
foreach ($headers as $key => $val)
{
$key = str_replace('_', ' ', strtolower($key));
$key = str_replace(' ', '-', ucwords($key));
$this->headers[$key] = $val;
}
return $this->headers;
}
// --------------------------------------------------------------------
/**
* Get Request Header
* Return the value of an element in the request header array
* Returns the value of a single member of the headers class member
*
* @param string array key for $this->headers
* @param boolean XSS Clean or not
* @return mixed FALSE on failure, string on success
*/
public function get_request_header($index, $xss_clean = FALSE)
{
if (emptyempty($this->headers))
{
$this->request_headers();
}
if ( ! isset($this->headers[$index]))
{
return FALSE;
}
if ($xss_clean === TRUE)
{
return $this->security->xss_clean($this->headers[$index]);
}
return $this->headers[$index];
}
// --------------------------------------------------------------------
/**
* Is ajax Request?
* 判断是否为ajax请求
* Test to see if a request contains the HTTP_X_REQUESTED_WITH header
*
* @return boolean
*/
public function is_ajax_request()
{
return ($this->server('HTTP_X_REQUESTED_WITH') === 'XMLHttpRequest');
}
// --------------------------------------------------------------------
/**
* Is cli Request?
* Determine whether the request comes from cli
* Test to see if a request was made from the command line
*
* @return bool
*/
public function is_cli_request()
{
return (php_sapi_name() === 'cli' OR defined('STDIN'));
}
}
/* End of file Input.php */
/* Location: ./system/core/Input.php */
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