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PHP Input class
<?php
class Input {
/**
* Protocol (http or https)
*
* @return string
*/
static public function protocol() {
$secure = (self::server('HTTP_HOST') && self::server('HTTPS') && strtolower(self::server('HTTPS')) !== 'off') ? true : false;
return ($secure) ? 'https' : 'http';
}
/**
* Is AJAX request
*
* @return bool
*/
static public function isAjax() {
return (self::server('HTTP_X_REQUESTED_WITH') && strtolower(self::server('HTTP_X_REQUESTED_WITH')) === 'xmlhttprequest') ? true : false;
}
/**
* Request method (usually GET or POST)
*
* @param bool $upper
* @return string
*/
static public function method($upper = true) {
$method = self::server('REQUEST_METHOD');
return ($upper) ? strtoupper($method) : strtolower($method);
}
/**
* Referrer
*
* @param string $default
* @return string
*/
static public function referrer($default = null) {
// If HTTP_REFERER is not found in $_SERVER, $default will be returned
$referrer = self::server('HTTP_REFERER', $default);
// If the referrer is null, and the default value is not null, set the referrer to $default
if (is_null($referrer) && ! is_null($default)) {
$referrer = $default;
}
return $referrer;
}
/**
* Find $_SERVER value
*
* @param string $index
* @param string $default
* @return mixed
*/
static public function server($index = '', $default = null) {
return self::_findFromArray($_SERVER, $index, $default, false);
}
/**
* Find $_GET value
*
* @param string $item
* @param string $default
* @param bool $xss_clean
* @return mixed
*/
static public function get($item = null, $default = null, $xss_clean = true) {
return self::_findFromArray($_GET, $item, $default, $xss_clean);
}
/**
* Find $_POST value
*
* @param string $item
* @param string $default
* @param bool $xss_clean
* @return mixed
*/
static public function post($item = null, $default = null, $xss_clean = true) {
return self::_findFromArray($_POST, $item, $default, $xss_clean);
}
/**
* Find $_GET/$_POST value (similar to $_REQUEST except it does not include $_COOKIE)
*
* @param string $item
* @param string $default
* @param bool $xss_clean
* @return mixed
*/
static public function request($item = null, $default = null, $xss_clean = true) {
$request = array_merge($_GET, $_POST);
return self::_findFromArray($request, $item, $default, $xss_clean);
}
/**
* Find $_FILE value. If a file field was submitted without a file selected, this may still return a value. It is best to use this method along with Input::hasFile()
*
* @param string $item
* @param string $default
* @return mixed
*/
static public function file($item = null, $default = null) {
return self::_findFromArray($_FILES, $item, $default, false);
}
/**
* Is an item available in the $_GET request? Checks for existence of key, not empty value
*
* @param string $item
* @return bool
*/
static public function inGet($item = null) {
return (is_null(self::get($item, null, false))) ? false : true;
}
/**
* Is an item available in the $_POST request? Checks for existence of key, not empty value
*
* @param string $item
* @return bool
*/
static public function inPost($item = null) {
return (is_null(self::post($item, null, false))) ? false : true;
}
/**
* Is an item available in $_GET/$_POST request? Checks for existence of key, not empty value
*
* @param string $item
* @return bool
*/
static public function inRequest($item = null) {
return (is_null(self::request($item, null, false))) ? false : true;
}
/**
* Is an item available in $_FILE request? Checks for existence of key, not empty array value
*
* @param string $item
* @return bool
*/
static public function inFile($item = null) {
return (is_null(self::file($item, null))) ? false : true;
}
/**
* Check if a file field selected a file to be uploaded
*
* @param string $item
* @return bool
*/
static public function hasFile($item = null) {
$file = self::file($item, null);
return ( ! is_null($file) && strlen($file['tmp_name']) > 0) ? true : false;
}
/**
* Clean data for XSS
*
* @param string|array $str
* @return mixed
*/
static public function xssClean($str = '') {
// No data? We're done here
if (is_string($str) && trim($str) === '') {
return $str;
}
// Recursive sanitize if this is an array
if (is_array($str)) {
foreach ($str as $key => $value) {
$str[$key] = self::xssClean($value);
}
return $str;
}
$str = str_replace(array(
'&amp;',
'&lt;',
'&gt;'
), array(
'&amp;amp;',
'&amp;lt;',
'&amp;gt;'
), $str);
// Fix &entitiy\n;
$str = preg_replace('#(&\#*\w+)[\x00-\x20]+;#u', '$1;', $str);
$str = preg_replace('#(&\#x*)([0-9A-F]+);*#iu', '$1$2;', $str);
$str = html_entity_decode($str, ENT_COMPAT, 'UTF-8');
// remove any attribute starting with "on" or xmlns
$str = preg_replace('#(<[^>]+[\x00-\x20\"\'\/])(on|xmlns)[^>]*>#iUu', '$1>', $str);
// remove javascript: and vbscript: protocol
$str = preg_replace('#([a-z]*)[\x00-\x20\/]*=[\x00-\x20\/]*([\`\'\"]*)[\x00-\x20\/]*j[\x00-\x20]*a[\x00-\x20]*v[\x00-\x20]*a[\x00-\x20]*s[\x00-\x20]*c[\x00-\x20]*r[\x00-\x20]*i[\x00-\x20]*p[\x00-\x20]*t[\x00-\x20]*:#iUu', '$1=$2nojavascript...', $str);
$str = preg_replace('#([a-z]*)[\x00-\x20\/]*=[\x00-\x20\/]*([\`\'\"]*)[\x00-\x20\/]*v[\x00-\x20]*b[\x00-\x20]*s[\x00-\x20]*c[\x00-\x20]*r[\x00-\x20]*i[\x00-\x20]*p[\x00-\x20]*t[\x00-\x20]*:#iUu', '$1=$2novbscript...', $str);
$str = preg_replace('#([a-z]*)[\x00-\x20\/]*=[\x00-\x20\/]*([\`\'\"]*)[\x00-\x20\/]*-moz-binding[\x00-\x20]*:#Uu', '$1=$2nomozbinding...', $str);
$str = preg_replace('#([a-z]*)[\x00-\x20\/]*=[\x00-\x20\/]*([\`\'\"]*)[\x00-\x20\/]*data[\x00-\x20]*:#Uu', '$1=$2nodata...', $str);
// Remove any style attributes, IE allows too much stupid things in them, eg.
// <span style="width: expression( alert( 'Ping!' ));"></span>
// and in general you really don't want style declarations in your UGC
$str = preg_replace('#(<[^>]+[\x00-\x20\"\'\/])style[^>]*>#iUu', '$1>', $str);
// Remove namespaced elements (we do not need them...)
$str = preg_replace('#</*\w+:\w[^>]*>#i', '', $str);
// Remove really unwanted tags
do {
$oldstring = $str;
$str = preg_replace('#</*(applet|meta|xml|blink|link|style|script|embed|object|iframe|frame|frameset|ilayer|layer|bgsound|title|base)[^>]*>#i', '', $str);
}
while ($oldstring != $str);
return $str;
}
/**
* Find in array
*
* @param array $array
* @param string $item
* @param mixed $default
* @param bool $xss_clean
* @return mixed
*/
static private function _findFromArray($array = array(), $item = '', $default = null, $xss_clean = true) {
// If the array is empty, we are done. Return default value
if (empty($array)) {
return $default;
}
// Check if an item has been provided. If not, return the entire sanitized array
if ( ! $item) {
$arr = array();
// loop through the full array
foreach (array_keys($array) as $key) {
$arr[$key] = self::_fetchFromArray($array, $key, $default, $xss_clean);
}
return $arr;
}
// Return sanitized item
return self::_fetchFromArray($array, $item, $default, $xss_clean);
}
/**
* Fetch from array
*
* @param array $array
* @param string $item
* @param string $default
* @param bool $xss_clean
* @return mixed
*/
static private function _fetchFromArray($array, $item = '', $default = null, $xss_clean = true) {
// Not found. Return default
if ( ! isset($array[$item])) {
return $default;
}
// Found it! Now clean it
if ($xss_clean) {
return self::xssClean($array[$item]);
}
// Found it! Return uncleaned
return $array[$item];
}
}
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