/home/bonphmya/topmotoculture.store/wp-content/plugins/woo-discount-rules/v2/App/Helpers/Input.php
<?php
namespace Wdr\App\Helpers;
if (!defined('ABSPATH')) exit; // Exit if accessed directly
class Input
{
/**
* Character set
*
* Will be overridden by the constructor.
*
* @var string
*/
public $charset = 'UTF-8';
/**
* IP address of the current user
*
* @var string
*/
protected $ip_address = FALSE;
/**
* Allow GET array flag
*
* If set to FALSE, then $_GET will be set to an empty array.
*
* @var bool
*/
protected $_allow_get_array = TRUE;
/**
* Standardize new lines flag
*
* If set to TRUE, then newlines are standardized.
*
* @var bool
*/
protected $_standardize_newlines;
/**
* Enable XSS flag
*
* Determines whether the XSS filter is always active when
* GET, POST or COOKIE data is encountered.
* Set automatically based on config setting.
*
* @var bool
*/
protected $_enable_xss = TRUE;
/**
* List of all HTTP request headers
*
* @var array
*/
protected $headers = array();
/**
* Raw input stream data
*
* Holds a cache of php://input contents
*
* @var string
*/
protected $_raw_input_stream;
/**
* List of never allowed strings
*
* @var array
*/
protected $_never_allowed_str = array(
'document.cookie' => '[removed]',
'(document).cookie' => '[removed]',
'document.write' => '[removed]',
'(document).write' => '[removed]',
'.parentNode' => '[removed]',
'.innerHTML' => '[removed]',
'-moz-binding' => '[removed]',
'<!--' => '<!--',
'-->' => '-->',
'<![CDATA[' => '<![CDATA[',
'<comment>' => '<comment>',
'<%' => '<%'
);
/**
* List of never allowed regex replacements
*
* @var array
*/
protected $_never_allowed_regex = array(
'javascript\s*:',
'(\(?document\)?|\(?window\)?(\.document)?)\.(location|on\w*)',
'expression\s*(\(|&\#40;)', // CSS and IE
'vbscript\s*:', // IE, surprise!
'wscript\s*:', // IE
'jscript\s*:', // IE
'vbs\s*:', // IE
'Redirect\s+30\d',
"([\"'])?data\s*:[^\\1]*?base64[^\\1]*?,[^\\1]*?\\1?"
);
/**
* XSS Hash
*
* Random Hash for protecting URLs.
*
* @var string
*/
protected $_xss_hash;
/**
* Parsed input stream data
*
* Parsed from php://input at runtime
*
* @see CI_Input::input_stream()
* @var array
*/
protected $_input_stream;
protected $security;
protected $uni;
/**
* Input constructor.
*/
/*function __construct()
{
// Sanitize global arrays
$this->_sanitize_globals();
}*/
/**
* Sanitize Globals
*/
protected function _sanitize_globals()
{
// Is $_GET data allowed? If not we'll set the $_GET to an empty array
if ($this->_allow_get_array === FALSE) {
$_GET = array();
} elseif (is_array($_GET)) {//phpcs:ignore WordPress.Security.NonceVerification.Recommended,
foreach ($_GET as $key => $val) {//phpcs:ignore WordPress.Security.NonceVerification.Recommended
$_GET[$this->_clean_input_keys($key)] = $this->_clean_input_data($val);
}
}
// Clean $_POST Data
if (is_array($_POST)) {//phpcs:ignore WordPress.Security.NonceVerification.Missing
foreach ($_POST as $key => $val) {//phpcs:ignore WordPress.Security.NonceVerification.Missing
$_POST[$this->_clean_input_keys($key)] = $this->_clean_input_data($val);
}
}
// Clean $_COOKIE Data
if (is_array($_COOKIE)) {
// 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'],
$_COOKIE['$Path'],
$_COOKIE['$Domain']
);
foreach ($_COOKIE as $key => $val) {
if (($cookie_key = $this->_clean_input_keys($key)) !== FALSE) {
$_COOKIE[$cookie_key] = $this->_clean_input_data($val);
} else {
unset($_COOKIE[$key]);
}
}
}
// Sanitize PHP_SELF
$_SERVER['PHP_SELF'] = isset($_SERVER['PHP_SELF']) && !empty($_SERVER['PHP_SELF']) ? wp_strip_all_tags(wp_unslash($_SERVER['PHP_SELF'])) : '';
}
/**
* Clean Keys
* @param $str
* @param bool $fatal
* @return bool
*/
protected function _clean_input_keys($str, $fatal = TRUE)
{
/* Commented this as it sanitize all request values which making conflict with other plugins */
/*if (!preg_match('/^[a-z0-9:_\/|-]+$/i', $str)) {
if ($fatal === TRUE) {
return FALSE;
} else {
$this->set_status_header(503);
echo 'Disallowed Key Characters.';
exit(7); // EXIT_USER_INPUT
}
}*/
return $str;
}
/**
* Set HTTP Status Header
* @param int $code
* @param string $text
*/
function set_status_header($code = 200, $text = '')
{
if (empty($text)) {
is_int($code) OR $code = (int)$code;
$stati = array(
100 => 'Continue',
101 => 'Switching Protocols',
200 => 'OK',
201 => 'Created',
202 => 'Accepted',
203 => 'Non-Authoritative Information',
204 => 'No Content',
205 => 'Reset Content',
206 => 'Partial Content',
300 => 'Multiple Choices',
301 => 'Moved Permanently',
302 => 'Found',
303 => 'See Other',
304 => 'Not Modified',
305 => 'Use Proxy',
307 => 'Temporary Redirect',
400 => 'Bad Request',
401 => 'Unauthorized',
402 => 'Payment Required',
403 => 'Forbidden',
404 => 'Not Found',
405 => 'Method Not Allowed',
406 => 'Not Acceptable',
407 => 'Proxy Authentication Required',
408 => 'Request Timeout',
409 => 'Conflict',
410 => 'Gone',
411 => 'Length Required',
412 => 'Precondition Failed',
413 => 'Request Entity Too Large',
414 => 'Request-URI Too Long',
415 => 'Unsupported Media Type',
416 => 'Requested Range Not Satisfiable',
417 => 'Expectation Failed',
422 => 'Unprocessable Entity',
426 => 'Upgrade Required',
428 => 'Precondition Required',
429 => 'Too Many Requests',
431 => 'Request Header Fields Too Large',
500 => 'Internal Server Error',
501 => 'Not Implemented',
502 => 'Bad Gateway',
503 => 'Service Unavailable',
504 => 'Gateway Timeout',
505 => 'HTTP Version Not Supported',
511 => 'Network Authentication Required',
);
if (isset($stati[$code])) {
$text = $stati[$code];
}
}
$server_protocol = (isset($_SERVER['SERVER_PROTOCOL']) && in_array($_SERVER['SERVER_PROTOCOL'], array('HTTP/1.0', 'HTTP/1.1', 'HTTP/2'), TRUE))
? sanitize_text_field(wp_unslash($_SERVER['SERVER_PROTOCOL'])) : 'HTTP/1.1';
header($server_protocol . ' ' . $code . ' ' . $text, TRUE, $code);
}
/**
* Clean Input Data
* @param $str
* @return array|string|string[]|null
*/
protected function _clean_input_data($str)
{
//if it is an object, just return.
if(is_object($str)) {
return $str;
}
if (is_array($str)) {
$new_array = array();
foreach (array_keys($str) as $key) {
$new_array[$this->_clean_input_keys($key)] = $this->_clean_input_data($str[$key]);
}
return $new_array;
}
if(is_object($str)){
return $str;
}
// Remove control characters
$str = $this->remove_invisible_characters($str, FALSE);
// Standardize newlines if needed
if ($this->_standardize_newlines === TRUE) {
return preg_replace('/(?:\r\n|[\r\n])/', PHP_EOL, $str);
}
return $str;
}
/**
* Determines if the current version of PHP is equal to or greater than the supplied value
* @param $version
* @return mixed
*/
function is_php($version)
{
static $_is_php;
$version = (string)$version;
if (!isset($_is_php[$version])) {
$_is_php[$version] = version_compare(PHP_VERSION, $version, '>=');
}
return $_is_php[$version];
}
/**
* Remove Invisible Characters
* @param $str
* @param bool $url_encoded
* @return string|string[]|null
*/
function remove_invisible_characters($str, $url_encoded = TRUE)
{
//This we have added as In paypal return request it filters the values which blocks from updating status
return $str;
$non_displayables = array();
// every control character except newline (dec 10),
// carriage return (dec 13) and horizontal tab (dec 09)
if ($url_encoded) {
$non_displayables[] = '/%0[0-8bcef]/i'; // url encoded 00-08, 11, 12, 14, 15
$non_displayables[] = '/%1[0-9a-f]/i'; // url encoded 16-31
$non_displayables[] = '/%7f/i'; // url encoded 127
}
$non_displayables[] = '/[\x00-\x08\x0B\x0C\x0E-\x1F\x7F]+/S'; // 00-08, 11, 12, 14-31, 127
do {
$str = preg_replace($non_displayables, '', $str, -1, $count);
} while ($count);
return $str;
}
/**
* Fetch an item from POST data with fallback to GET
* @param $index
* @param null $xss_clean
* @param null $default
* @return mixed
*/
function post_get($index, $default = NULL, $xss_clean = NULL)
{
//phpcs:ignore WordPress.Security.NonceVerification.Missing
return isset($_POST[$index]) ? $this->post($index, $default, $xss_clean) : $this->get($index, $default, $xss_clean);
}
/**
* Fetch an item from the POST array
* @param null $index
* @param null $default
* @param null $xss_clean
* @return mixed
*/
function post($index = NULL, $default = NULL, $xss_clean = NULL)
{
//phpcs:ignore WordPress.Security.NonceVerification.Missing
return $this->_fetch_from_array($_POST, $index, $default, $xss_clean);
}
/**
* Fetch from array
* @param $array
* @param null $index
* @param null $default
* @param null $xss_clean
* @return array|string|null
*/
protected function _fetch_from_array(&$array, $index = NULL, $default = NULL, $xss_clean = NULL)
{
is_bool($xss_clean) OR $xss_clean = $this->_enable_xss;
// If $index is NULL, it means that the whole $array is requested
$index = (!isset($index) || is_null($index)) ? array_keys($array) : $index;
// allow fetching multiple keys at once
if (is_array($index)) {
$output = array();
foreach ($index as $key) {
$output[$key] = $this->_fetch_from_array($array, $key, $default, $xss_clean);
}
return $output;
}
if (isset($array[$index])) {
$value = $array[$index];
} elseif (($count = preg_match_all('/(?:^[^\[]+)|\[[^]]*\]/', $index, $matches)) > 1) // Does the index contain array notation
{
$value = $array;
for ($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;
}
}
} else {
return $default;
}
return ($xss_clean === TRUE) ? $this->xss_clean($value) : $value;
}
/**
* XSS Clean
* @param $str
* @param bool $is_image
* @return array|bool|string|string[]|null
*/
function xss_clean($str, $is_image = FALSE)
{
//is this an object, then return it.
if(is_object($str)) {
return $str;
}
// Is the string an array?
if (is_array($str)) {
foreach ($str as $key => &$value) {
$str[$key] = $this->xss_clean($value);
}
return $str;
}
// Remove Invisible Characters
$str = $this->remove_invisible_characters($str);
/*
* URL Decode
*
* Just in case stuff like this is submitted:
*
* <a href="http://%77%77%77%2E%67%6F%6F%67%6C%65%2E%63%6F%6D">Google</a>
*
* Note: Use rawurldecode() so it does not remove plus signs
*/
if (stripos($str, '%') !== false) {
do {
$oldstr = $str;
$str = rawurldecode($str);
$str = preg_replace_callback('#%(?:\s*[0-9a-f]){2,}#i', array($this, '_urldecodespaces'), $str);
} while ($oldstr !== $str);
unset($oldstr);
}
/*
* Convert character entities to ASCII
*
* This permits our tests below to work reliably.
* We only convert entities that are within tags since
* these are the ones that will pose security problems.
*/
$str = preg_replace_callback("/[^a-z0-9>]+[a-z0-9]+=([\'\"]).*?\\1/si", array($this, '_convert_attribute'), $str);
$str = preg_replace_callback('/<\w+.*/si', array($this, '_decode_entity'), $str);
// Remove Invisible Characters Again!
$str = $this->remove_invisible_characters($str);
/*
* Convert all tabs to spaces
*
* This prevents strings like this: ja vascript
* NOTE: we deal with spaces between characters later.
* NOTE: preg_replace was found to be amazingly slow here on
* large blocks of data, so we use str_replace.
*/
$str = str_replace("\t", ' ', $str);
// Capture converted string for later comparison
$converted_string = $str;
// Remove Strings that are never allowed
$str = $this->_do_never_allowed($str);
/*
* Makes PHP tags safe
*
* Note: XML tags are inadvertently replaced too:
*
* <?xml
*
* But it doesn't seem to pose a problem.
*/
if ($is_image === TRUE) {
// Images have a tendency to have the PHP short opening and
// closing tags every so often so we skip those and only
// do the long opening tags.
$str = preg_replace('/<\?(php)/i', '<?\\1', $str);
} else {
$str = str_replace(array('<?', '?' . '>'), array('<?', '?>'), $str);
}
/*
* Compact any exploded words
*
* This corrects words like: j a v a s c r i p t
* These words are compacted back to their correct state.
*/
$words = array(
'javascript', 'expression', 'vbscript', 'jscript', 'wscript',
'vbs', 'script', 'base64', 'applet', 'alert', 'document',
'write', 'cookie', 'window', 'confirm', 'prompt', 'eval'
);
foreach ($words as $word) {
$word = implode('\s*', str_split($word)) . '\s*';
// We only want to do this when it is followed by a non-word character
// That way valid stuff like "dealer to" does not become "dealerto"
$str = preg_replace_callback('#(' . substr($word, 0, -3) . ')(\W)#is', array($this, '_compact_exploded_words'), $str);
}
/*
* Remove disallowed Javascript in links or img tags
* We used to do some version comparisons and use of stripos(),
* but it is dog slow compared to these simplified non-capturing
* preg_match(), especially if the pattern exists in the string
*
* Note: It was reported that not only space characters, but all in
* the following pattern can be parsed as separators between a tag name
* and its attributes: [\d\s"\'`;,\/\=\(\x00\x0B\x09\x0C]
* ... however, remove_invisible_characters() above already strips the
* hex-encoded ones, so we'll skip them below.
*/
do {
$original = $str;
if (preg_match('/<a/i', $str)) {
$str = preg_replace_callback('#<a(?:rea)?[^a-z0-9>]+([^>]*?)(?:>|$)#si', array($this, '_js_link_removal'), $str);
}
if (preg_match('/<img/i', $str)) {
$str = preg_replace_callback('#<img[^a-z0-9]+([^>]*?)(?:\s?/?>|$)#si', array($this, '_js_img_removal'), $str);
}
if (preg_match('/script|xss/i', $str)) {
$str = preg_replace('#</*(?:script|xss).*?>#si', '[removed]', $str);
}
} while ($original !== $str);
unset($original);
/*
* Sanitize naughty HTML elements
*
* If a tag containing any of the words in the list
* below is found, the tag gets converted to entities.
*
* So this: <blink>
* Becomes: <blink>
*/
$pattern = '#'
. '<((?<slash>/*\s*)((?<tagName>[a-z0-9]+)(?=[^a-z0-9]|$)|.+)' // tag start and name, followed by a non-tag character
. '[^\s\042\047a-z0-9>/=]*' // a valid attribute character immediately after the tag would count as a separator
// optional attributes
. '(?<attributes>(?:[\s\042\047/=]*' // non-attribute characters, excluding > (tag close) for obvious reasons
. '[^\s\042\047>/=]+' // attribute characters
// optional attribute-value
. '(?:\s*=' // attribute-value separator
. '(?:[^\s\042\047=><`]+|\s*\042[^\042]*\042|\s*\047[^\047]*\047|\s*(?U:[^\s\042\047=><`]*))' // single, double or non-quoted value
. ')?' // end optional attribute-value group
. ')*)' // end optional attributes group
. '[^>]*)(?<closeTag>\>)?#isS';
// Note: It would be nice to optimize this for speed, BUT
// only matching the naughty elements here results in
// false positives and in turn - vulnerabilities!
do {
$old_str = $str;
$str = preg_replace_callback($pattern, array($this, '_sanitize_naughty_html'), $str);
} while ($old_str !== $str);
unset($old_str);
/*
* Sanitize naughty scripting elements
*
* Similar to above, only instead of looking for
* tags it looks for PHP and JavaScript commands
* that are disallowed. Rather than removing the
* code, it simply converts the parenthesis to entities
* rendering the code un-executable.
*
* For example: eval('some code')
* Becomes: eval('some code')
*/
$str = preg_replace(
'#(alert|prompt|confirm|cmd|passthru|eval|exec|expression|system|fopen|fsockopen|file|file_get_contents|readfile|unlink)(\s*)\((.*?)\)#si',
'\\1\\2(\\3)',
$str
);
// Same thing, but for "tag functions" (e.g. eval`some code`)
// See https://github.com/bcit-ci/CodeIgniter/issues/5420
$str = preg_replace(
'#(alert|prompt|confirm|cmd|passthru|eval|exec|expression|system|fopen|fsockopen|file|file_get_contents|readfile|unlink)(\s*)`(.*?)`#si',
'\\1\\2`\\3`',
$str
);
// Final clean up
// This adds a bit of extra precaution in case
// something got through the above filters
$str = $this->_do_never_allowed($str);
/*
* Images are Handled in a Special Way
* - Essentially, we want to know that after all of the character
* conversion is done whether any unwanted, likely XSS, code was found.
* If not, we return TRUE, as the image is clean.
* However, if the string post-conversion does not matched the
* string post-removal of XSS, then it fails, as there was unwanted XSS
* code found and removed/changed during processing.
*/
if ($is_image === TRUE) {
return ($str === $converted_string);
}
return $str;
}
/**
* Do Never Allowed
* @param $str
* @return mixed|string|string[]|null
*/
protected
function _do_never_allowed($str)
{
$str = str_replace(array_keys($this->_never_allowed_str), $this->_never_allowed_str, $str);
foreach ($this->_never_allowed_regex as $regex) {
$str = preg_replace('#' . $regex . '#is', '[removed]', $str);
}
return $str;
}
/**
* Fetch an item from the GET array
* @param null $index
* @param null $default
* @param null $xss_clean
* @return mixed
*/
function get($index = NULL, $default = NULL, $xss_clean = NULL)
{
//phpcs:ignore WordPress.Security.NonceVerification.Recommended
return $this->_fetch_from_array($_GET, $index, $default, $xss_clean);
}
/**
* Fetch an item from GET data with fallback to POST
* @param $index
* @param null $xss_clean
* @param null $default
* @return mixed
*/
function get_post($index, $default = NULL, $xss_clean = NULL)
{
//phpcs:ignore WordPress.Security.NonceVerification.Recommended
return isset($_GET[$index]) ? $this->get($index, $default, $xss_clean) : $this->post($index, $default, $xss_clean);
}
/**
* Fetch an item from the COOKIE array
* @param null $index
* @param null $default
* @param null $xss_clean
* @return mixed
*/
function cookie($index = NULL, $default = NULL, $xss_clean = NULL)
{
return $this->_fetch_from_array($_COOKIE, $index, $default, $xss_clean);
}
/**
* Fetch an item from the php://input stream
* @param null $index
* @param null $default
* @param null $xss_clean
* @return mixed
*/
function input_stream($index = NULL, $default = NULL, $xss_clean = NULL)
{
// Prior to PHP 5.6, the input stream can only be read once,
// so we'll need to check if we have already done that first.
if (!is_array($this->_input_stream)) {
// $this->raw_input_stream will trigger __get().
parse_str($this->_raw_input_stream, $this->_input_stream);
is_array($this->_input_stream) OR $this->_input_stream = array();
}
return $this->_fetch_from_array($this->_input_stream, $index, $default, $xss_clean);
}
/**
* Fetch User Agent string
* @param null $xss_clean
* @param null $default
* @return mixed
*/
function user_agent($xss_clean = NULL, $default = NULL)
{
return $this->_fetch_from_array($_SERVER, 'HTTP_USER_AGENT', $default, $xss_clean);
}
/**
* Get Request Header
* @param $index
* @param bool $xss_clean
* @return string|null
*/
function get_request_header($index, $xss_clean = FALSE)
{
static $headers;
if (!isset($headers)) {
empty($this->headers) && $this->request_headers();
foreach ($this->headers as $key => $value) {
$headers[strtolower($key)] = $value;
}
}
$index = strtolower($index);
if (!isset($headers[$index])) {
return NULL;
}
return ($xss_clean === TRUE)
? $this->xss_clean($headers[$index])
: $headers[$index];
}
/**
* Request Headers
* @param bool $xss_clean
* @return mixed
*/
function request_headers($xss_clean = FALSE)
{
// If header is already defined, return it immediately
if (!empty($this->headers)) {
return $this->_fetch_from_array($this->headers, NULL, NULL, $xss_clean);
}
// In Apache, you can simply call apache_request_headers()
if (function_exists('apache_request_headers')) {
$this->headers = apache_request_headers();
} else {
isset($_SERVER['CONTENT_TYPE']) && $this->headers['Content-Type'] = sanitize_text_field(wp_unslash($_SERVER['CONTENT_TYPE']));
foreach ($_SERVER as $key => $val) {
if (sscanf($key, 'HTTP_%s', $header) === 1) {
// take SOME_HEADER and turn it into Some-Header
$header = str_replace('_', ' ', strtolower($header));
$header = str_replace(' ', '-', ucwords($header));
$this->headers[$header] = $_SERVER[$key];//phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotValidated,WordPress.Security.ValidatedSanitizedInput.MissingUnslash,WordPress.Security.ValidatedSanitizedInput.InputNotSanitized
}
}
}
return $this->_fetch_from_array($this->headers, NULL, NULL, $xss_clean);
}
/**
* Get Request Method
* @param bool $upper
* @return string
*/
function method($upper = FALSE)
{
return ($upper)
? strtoupper($this->server('REQUEST_METHOD'))
: strtolower($this->server('REQUEST_METHOD'));
}
/**
* Fetch an item from the SERVER array
* @param $index
* @param null $xss_clean
* @param null $default
* @return mixed
*/
function server($index, $default = NULL, $xss_clean = NULL)
{
return $this->_fetch_from_array($_SERVER, $index, $default, $xss_clean);
}
/**
* Allows read access to protected properties
* @param $name
* @return false|string
*/
function __get($name)
{
if ($name === 'raw_input_stream') {
isset($this->_raw_input_stream) OR $this->_raw_input_stream = file_get_contents('php://input');
return $this->_raw_input_stream;
} elseif ($name === 'ip_address') {
return $this->ip_address;
}
}
/**
* URL-decode taking spaces into account
* @param $matches
* @return string
*/
protected
function _urldecodespaces($matches)
{
$input = $matches[0];
$nospaces = preg_replace('#\s+#', '', $input);
return ($nospaces === $input)
? $input
: rawurldecode($nospaces);
}
/**
* HTML Entity Decode Callback
* @param $match
* @return mixed
* @throws \Exception
*/
protected
function _decode_entity($match)
{
// Protect GET variables in URLs
// 901119URL5918AMP18930PROTECT8198
$match = preg_replace('|\&([a-z\_0-9\-]+)\=([a-z\_0-9\-/]+)|i', $this->xss_hash() . '\\1=\\2', $match[0]);
// Decode, then un-protect URL GET vars
return str_replace(
$this->xss_hash(),
'&',
$this->entity_decode($match, $this->charset)
);
}
/**
* Generates the XSS hash if needed and returns it.
* @return mixed|string
* @throws \Exception
*/
function xss_hash()
{
if ($this->_xss_hash === NULL) {
$rand = $this->get_random_bytes(16);
$this->_xss_hash = ($rand === FALSE)
? md5(uniqid(wp_rand(), TRUE))
: bin2hex($rand);
}
return $this->_xss_hash;
}
/**
* Get random bytes
* @param $length
* @return bool|string|void
* @throws \Exception
*/
function get_random_bytes($length)
{
global $wp_filesystem;
if (empty($wp_filesystem)) {
require_once ABSPATH . '/wp-admin/includes/file.php';
WP_Filesystem();
}
if (empty($length) OR !ctype_digit((string)$length)) {
return FALSE;
}
if (function_exists('random_bytes')) {
try {
// The cast is required to avoid TypeError
return random_bytes((int)$length);
} catch (\Exception $e) {
// If random_bytes() can't do the job, we can't either ...
// There's no point in using fallbacks.
return FALSE;
}
}
if ($wp_filesystem->exists('/dev/urandom')) {
$output = $wp_filesystem->get_contents('/dev/urandom', false, $length);
if ($output !== false) {
return $output;
}
}
if (function_exists('openssl_random_pseudo_bytes')) {
return openssl_random_pseudo_bytes($length);
}
return FALSE;
}
/**
* HTML Entities Decode
* @param $str
* @param null $charset
* @return mixed|string
*/
function entity_decode($str, $charset = NULL)
{
if (strpos($str, '&') === FALSE) {
return $str;
}
static $_entities;
isset($charset) OR $charset = $this->charset;
$flag = $this->is_php('5.4')
? ENT_COMPAT | ENT_HTML5
: ENT_COMPAT;
if (!isset($_entities)) {
$_entities = array_map('strtolower', get_html_translation_table(HTML_ENTITIES, $flag, $charset));
// If we're not on PHP 5.4+, add the possibly dangerous HTML 5
// entities to the array manually
if ($flag === ENT_COMPAT) {
$_entities[':'] = ':';
$_entities['('] = '(';
$_entities[')'] = ')';
$_entities["\n"] = '
';
$_entities["\t"] = '	';
}
}
do {
$str_compare = $str;
// Decode standard entities, avoiding false positives
if (preg_match_all('/&[a-z]{2,}(?![a-z;])/i', $str, $matches)) {
$replace = array();
$matches = array_unique(array_map('strtolower', $matches[0]));
foreach ($matches as &$match) {
if (($char = array_search($match . ';', $_entities, TRUE)) !== FALSE) {
$replace[$match] = $char;
}
}
$str = str_replace(array_keys($replace), array_values($replace), $str);
}
// Decode numeric & UTF16 two byte entities
$str = html_entity_decode(
preg_replace('/(&#(?:x0*[0-9a-f]{2,5}(?![0-9a-f;])|(?:0*\d{2,4}(?![0-9;]))))/iS', '$1;', $str),
$flag,
$charset
);
if ($flag === ENT_COMPAT) {
$str = str_replace(array_values($_entities), array_keys($_entities), $str);
}
} while ($str_compare !== $str);
return $str;
}
/**
* Compact Exploded Words
* @param $matches
* @return string
*/
protected
function _compact_exploded_words($matches)
{
return preg_replace('/\s+/s', '', $matches[1]) . $matches[2];
}
/**
* JS Link Removal
*
* Callback function for xss_clean() to sanitize links
* This limits the PCRE backtracks, making it more performance friendly
* and prevents PREG_BACKTRACK_LIMIT_ERROR from being triggered in
* PHP 5.2+ on link-heavy strings
*
* @param array
* @return string
*/
protected function _js_link_removal($match)
{
return str_replace(
$match[1],
preg_replace(
'#href=.*?(alert\(|alert&\#40;|javascript\:|livescript\:|mocha\:|charset\=|window\.|document\.|\.cookie|<script|<xss|data\s*:)#si',
'',
$this->_filter_attributes(str_replace(array('<', '>'), '', $match[1]))
),
$match[0]
);
}
/**
* JS Image Removal
*
* Callback function for xss_clean() to sanitize image tags
* This limits the PCRE backtracks, making it more performance friendly
* and prevents PREG_BACKTRACK_LIMIT_ERROR from being triggered in
* PHP 5.2+ on image tag heavy strings
*
* @param array
* @return string
*/
protected function _js_img_removal($match)
{
return str_replace(
$match[1],
preg_replace(
'#src=.*?(alert\(|alert&\#40;|javascript\:|livescript\:|mocha\:|charset\=|window\.|document\.|\.cookie|<script|<xss|base64\s*,)#si',
'',
$this->_filter_attributes(str_replace(array('<', '>'), '', $match[1]))
),
$match[0]
);
}
/**
* Filter Attributes
*
* Filters tag attributes for consistency and safety
*
* @param string
* @return string
*/
protected function _filter_attributes($str)
{
$out = '';
if (preg_match_all('#\s*[a-z\-]+\s*=\s*(\042|\047)([^\\1]*?)\\1#is', $str, $matches))
{
foreach ($matches[0] as $match)
{
$out .= preg_replace("#/\*.*?\*/#s", '', $match);
}
}
return $out;
}
/**
* Sanitize Naughty HTML
* @param $matches
* @return string
*/
protected
function _sanitize_naughty_html($matches)
{
static $naughty_tags = array(
'alert', 'area', 'prompt', 'confirm', 'applet', 'audio', 'basefont', 'base', 'behavior', 'bgsound',
'blink', 'body', 'embed', 'expression', 'form', 'frameset', 'frame', 'head', 'html', 'ilayer',
'iframe', 'input', 'button', 'select', 'isindex', 'layer', 'link', 'meta', 'keygen', 'object',
'plaintext', 'style', 'script', 'textarea', 'title', 'math', 'video', 'svg', 'xml', 'xss'
);
static $evil_attributes = array(
'on\w+', 'style', 'xmlns', 'formaction', 'form', 'xlink:href', 'FSCommand', 'seekSegmentTime'
);
// First, escape unclosed tags
if (empty($matches['closeTag'])) {
return '<' . $matches[1];
} // Is the element that we caught naughty? If so, escape it
elseif (in_array(strtolower($matches['tagName']), $naughty_tags, TRUE)) {
return '<' . $matches[1] . '>';
} // For other tags, see if their attributes are "evil" and strip those
elseif (isset($matches['attributes'])) {
// We'll store the already filtered attributes here
$attributes = array();
// Attribute-catching pattern
$attributes_pattern = '#'
. '(?<name>[^\s\042\047>/=]+)' // attribute characters
// optional attribute-value
. '(?:\s*=(?<value>[^\s\042\047=><`]+|\s*\042[^\042]*\042|\s*\047[^\047]*\047|\s*(?U:[^\s\042\047=><`]*)))' // attribute-value separator
. '#i';
// Blacklist pattern for evil attribute names
$is_evil_pattern = '#^(' . implode('|', $evil_attributes) . ')$#i';
// Each iteration filters a single attribute
do {
// Strip any non-alpha characters that may precede an attribute.
// Browsers often parse these incorrectly and that has been a
// of numerous XSS issues we've had.
$matches['attributes'] = preg_replace('#^[^a-z]+#i', '', $matches['attributes']);
if (!preg_match($attributes_pattern, $matches['attributes'], $attribute, PREG_OFFSET_CAPTURE)) {
// No (valid) attribute found? Discard everything else inside the tag
break;
}
if (
// Is it indeed an "evil" attribute?
preg_match($is_evil_pattern, $attribute['name'][0])
// Or does it have an equals sign, but no value and not quoted? Strip that too!
OR (trim($attribute['value'][0]) === '')
) {
$attributes[] = 'xss=removed';
} else {
$attributes[] = $attribute[0][0];
}
$matches['attributes'] = substr($matches['attributes'], $attribute[0][1] + strlen($attribute[0][0]));
} while ($matches['attributes'] !== '');
$attributes = empty($attributes)
? ''
: ' ' . implode(' ', $attributes);
return '<' . $matches['slash'] . $matches['tagName'] . $attributes . '>';
}
return $matches[0];
}
/**
* Attribute Conversion
* @param $match
* @return mixed
*/
protected
function _convert_attribute($match)
{
return str_replace(array('>', '<', '\\'), array('>', '<', '\\\\'), $match[0]);
}
}