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CI framework source code reading---------Input.php_PHP tutorial

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Release： 2016-07-14 10:09:20
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[php]  

/** 
 * 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))
{
                                                                                                                                                                                                                                                               
foreach (array('value', 'expire', 'domain', 'path', 'prefix', 'secure', 'name') as $item)
                                                                 
if (isset($name[$item]))
                                                                         
$$item = $name[$item];
        }  
      }  
} }
// If a parameter is the default value but the configuration in config.php is not the default value
// Then use the configuration value in config.php
if ($prefix == '' AND config_item('cookie_prefix') != '')
{
$prefix = config_item('cookie_prefix');
} }
if ($domain == '' AND config_item('cookie_domain') != '')
{
$domain = config_item('cookie_domain');
} }
if ($path == '/' AND config_item('cookie_path') != '/')
{
$path = config_item('cookie_path');
} }
if ($secure == FALSE AND config_item('cookie_secure') != FALSE)
{
$secure = config_item('cookie_secure');
} }
if ( ! is_numeric($expire))
{
$expire = time() - 86500;
} }
else
{
$expire = ($expire > 0) ? time() + $expire : 0;
} }
setcookie($prefix.$name, $value, $expire, $path, $domain, $secure);
}
//------------------------------------------------ -----------------------
    /**
* 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))
                                                                 
                                                                                                         
                                                                         
global $$global;
$$global = NULL;
        }  
      }  
        else  
                                                                 
foreach ($global as $key => $val)
                                                                         
                                                                                                                         
                                                                                 
global $$key;
$$key = NULL;
                                                                       
        }  
      }  
} }
// 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)
                                                                 
foreach ($_GET as $key => $val)
                                                                         
$_GET[$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)
                                                                 
$_POST[$this->_clean_input_keys($key)] = $this->_clean_input_data($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)
                                                                 
                  $str = str_replace(array("rn", "r", "rnn"), PHP_EOL, $str);
      }  
} }
return $str;
}
//------------------------------------------------ -----------------------
/** 
    * Clean Keys 
    * 过滤键值  
    * This is a helper function. To prevent malicious users 
    * from trying to exploit keys we make sure that keys are 
    * only named with alpha-numeric text and a few other items. 
    * 
    * @access   private 
    * @param    string 
    * @return   string 
   */
function _clean_input_keys($str)
{
if ( ! preg_match("/^[a-z0-9:_/-]+$/i", $str))
{
exit('Disallowed Key Characters.');
} }
// Clean UTF-8 if supported
if (UTF8_ENABLED === TRUE)
{
$str = $this->uni->clean_string($str);
} }
return $str;
}
//------------------------------------------------ -----------------------
/** 
     * Request Headers 
     * 返回请求头（header）数组。 
     * In Apache, you can simply call apache_request_headers(), however for 
     * people running other webservers the function is undefined. 
     * 
     * @param   bool XSS cleaning 
     * 
     * @return array 
     */
public function request_headers($xss_clean = FALSE)
{
// Look at Apache go!
if (function_exists('apache_request_headers'))
        {  
            $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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