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Code Editor : InputFilter.php
<?php /** * Joomla! Content Management System * * @copyright Copyright (C) 2005 - 2019 Open Source Matters, Inc. All rights reserved. * @license GNU General Public License version 2 or later; see LICENSE.txt */ namespace Joomla\CMS\Filter; defined('JPATH_PLATFORM') or die; use Joomla\Filter\InputFilter as BaseInputFilter; use Joomla\String\StringHelper; /** * InputFilter is a class for filtering input from any data source * * Forked from the php input filter library by: Daniel Morris <dan@rootcube.com> * Original Contributors: Gianpaolo Racca, Ghislain Picard, Marco Wandschneider, Chris Tobin and Andrew Eddie. * * @since 1.7.0 */ class InputFilter extends BaseInputFilter { /** * A flag for Unicode Supplementary Characters (4-byte Unicode character) stripping. * * @var integer * * @since 3.5 */ public $stripUSC = 0; /** * Constructor for inputFilter class. Only first parameter is required. * * @param array $tagsArray List of user-defined tags * @param array $attrArray List of user-defined attributes * @param integer $tagsMethod WhiteList method = 0, BlackList method = 1 * @param integer $attrMethod WhiteList method = 0, BlackList method = 1 * @param integer $xssAuto Only auto clean essentials = 0, Allow clean blacklisted tags/attr = 1 * @param integer $stripUSC Strip 4-byte unicode characters = 1, no strip = 0, ask the database driver = -1 * * @since 1.7.0 */ public function __construct($tagsArray = array(), $attrArray = array(), $tagsMethod = 0, $attrMethod = 0, $xssAuto = 1, $stripUSC = -1) { // Make sure user defined arrays are in lowercase $tagsArray = array_map('strtolower', (array) $tagsArray); $attrArray = array_map('strtolower', (array) $attrArray); // Assign member variables $this->tagsArray = $tagsArray; $this->attrArray = $attrArray; $this->tagsMethod = $tagsMethod; $this->attrMethod = $attrMethod; $this->xssAuto = $xssAuto; $this->stripUSC = $stripUSC; /** * If Unicode Supplementary Characters stripping is not set we have to check with the database driver. If the * driver does not support USCs (i.e. there is no utf8mb4 support) we will enable USC stripping. */ if ($this->stripUSC === -1) { try { // Get the database driver $db = \JFactory::getDbo(); // This trick is required to let the driver determine the utf-8 multibyte support $db->connect(); // And now we can decide if we should strip USCs $this->stripUSC = $db->hasUTF8mb4Support() ? 0 : 1; } catch (\RuntimeException $e) { // Could not connect to MySQL. Strip USC to be on the safe side. $this->stripUSC = 1; } } } /** * Returns an input filter object, only creating it if it doesn't already exist. * * @param array $tagsArray List of user-defined tags * @param array $attrArray List of user-defined attributes * @param integer $tagsMethod WhiteList method = 0, BlackList method = 1 * @param integer $attrMethod WhiteList method = 0, BlackList method = 1 * @param integer $xssAuto Only auto clean essentials = 0, Allow clean blacklisted tags/attr = 1 * @param integer $stripUSC Strip 4-byte unicode characters = 1, no strip = 0, ask the database driver = -1 * * @return InputFilter The InputFilter object. * * @since 1.7.0 */ public static function &getInstance($tagsArray = array(), $attrArray = array(), $tagsMethod = 0, $attrMethod = 0, $xssAuto = 1, $stripUSC = -1) { $sig = md5(serialize(array($tagsArray, $attrArray, $tagsMethod, $attrMethod, $xssAuto))); if (empty(self::$instances[$sig])) { self::$instances[$sig] = new InputFilter($tagsArray, $attrArray, $tagsMethod, $attrMethod, $xssAuto, $stripUSC); } return self::$instances[$sig]; } /** * Method to be called by another php script. Processes for XSS and * specified bad code. * * @param mixed $source Input string/array-of-string to be 'cleaned' * @param string $type The return type for the variable: * INT: An integer, or an array of integers, * UINT: An unsigned integer, or an array of unsigned integers, * FLOAT: A floating point number, or an array of floating point numbers, * BOOLEAN: A boolean value, * WORD: A string containing A-Z or underscores only (not case sensitive), * ALNUM: A string containing A-Z or 0-9 only (not case sensitive), * CMD: A string containing A-Z, 0-9, underscores, periods or hyphens (not case sensitive), * BASE64: A string containing A-Z, 0-9, forward slashes, plus or equals (not case sensitive), * STRING: A fully decoded and sanitised string (default), * HTML: A sanitised string, * ARRAY: An array, * PATH: A sanitised file path, or an array of sanitised file paths, * TRIM: A string trimmed from normal, non-breaking and multibyte spaces * USERNAME: Do not use (use an application specific filter), * RAW: The raw string is returned with no filtering, * unknown: An unknown filter will act like STRING. If the input is an array it will return an * array of fully decoded and sanitised strings. * * @return mixed 'Cleaned' version of input parameter * * @since 1.7.0 */ public function clean($source, $type = 'string') { // Strip Unicode Supplementary Characters when requested to do so if ($this->stripUSC) { // Alternatively: preg_replace('/[\x{10000}-\x{10FFFF}]/u', "\xE2\xAF\x91", $source) but it'd be slower. $source = $this->stripUSC($source); } // Handle the type constraint cases switch (strtoupper($type)) { case 'INT': case 'INTEGER': $pattern = '/[-+]?[0-9]+/'; if (is_array($source)) { $result = array(); // Iterate through the array foreach ($source as $eachString) { preg_match($pattern, (string) $eachString, $matches); $result[] = isset($matches[0]) ? (int) $matches[0] : 0; } } else { preg_match($pattern, (string) $source, $matches); $result = isset($matches[0]) ? (int) $matches[0] : 0; } break; case 'UINT': $pattern = '/[-+]?[0-9]+/'; if (is_array($source)) { $result = array(); // Iterate through the array foreach ($source as $eachString) { preg_match($pattern, (string) $eachString, $matches); $result[] = isset($matches[0]) ? abs((int) $matches[0]) : 0; } } else { preg_match($pattern, (string) $source, $matches); $result = isset($matches[0]) ? abs((int) $matches[0]) : 0; } break; case 'FLOAT': case 'DOUBLE': $pattern = '/[-+]?[0-9]+(\.[0-9]+)?([eE][-+]?[0-9]+)?/'; if (is_array($source)) { $result = array(); // Iterate through the array foreach ($source as $eachString) { preg_match($pattern, (string) $eachString, $matches); $result[] = isset($matches[0]) ? (float) $matches[0] : 0; } } else { preg_match($pattern, (string) $source, $matches); $result = isset($matches[0]) ? (float) $matches[0] : 0; } break; case 'BOOL': case 'BOOLEAN': if (is_array($source)) { $result = array(); // Iterate through the array foreach ($source as $eachString) { $result[] = (bool) $eachString; } } else { $result = (bool) $source; } break; case 'WORD': $pattern = '/[^A-Z_]/i'; if (is_array($source)) { $result = array(); // Iterate through the array foreach ($source as $eachString) { $result[] = (string) preg_replace($pattern, '', $eachString); } } else { $result = (string) preg_replace($pattern, '', $source); } break; case 'ALNUM': $pattern = '/[^A-Z0-9]/i'; if (is_array($source)) { $result = array(); // Iterate through the array foreach ($source as $eachString) { $result[] = (string) preg_replace($pattern, '', $eachString); } } else { $result = (string) preg_replace($pattern, '', $source); } break; case 'CMD': $pattern = '/[^A-Z0-9_\.-]/i'; if (is_array($source)) { $result = array(); // Iterate through the array foreach ($source as $eachString) { $cleaned = (string) preg_replace($pattern, '', $eachString); $result[] = ltrim($cleaned, '.'); } } else { $result = (string) preg_replace($pattern, '', $source); $result = ltrim($result, '.'); } break; case 'BASE64': $pattern = '/[^A-Z0-9\/+=]/i'; if (is_array($source)) { $result = array(); // Iterate through the array foreach ($source as $eachString) { $result[] = (string) preg_replace($pattern, '', $eachString); } } else { $result = (string) preg_replace($pattern, '', $source); } break; case 'STRING': if (is_array($source)) { $result = array(); // Iterate through the array foreach ($source as $eachString) { $result[] = (string) $this->remove($this->decode((string) $eachString)); } } else { $result = (string) $this->remove($this->decode((string) $source)); } break; case 'HTML': if (is_array($source)) { $result = array(); // Iterate through the array foreach ($source as $eachString) { $result[] = (string) $this->remove((string) $eachString); } } else { $result = (string) $this->remove((string) $source); } break; case 'ARRAY': $result = (array) $source; break; case 'PATH': $pattern = '/^[A-Za-z0-9_\/-]+[A-Za-z0-9_\.-]*([\\\\\/][A-Za-z0-9_-]+[A-Za-z0-9_\.-]*)*$/'; if (is_array($source)) { $result = array(); // Iterate through the array foreach ($source as $eachString) { preg_match($pattern, (string) $eachString, $matches); $result[] = isset($matches[0]) ? (string) $matches[0] : ''; } } else { preg_match($pattern, $source, $matches); $result = isset($matches[0]) ? (string) $matches[0] : ''; } break; case 'TRIM': if (is_array($source)) { $result = array(); // Iterate through the array foreach ($source as $eachString) { $cleaned = (string) trim($eachString); $cleaned = StringHelper::trim($cleaned, chr(0xE3) . chr(0x80) . chr(0x80)); $result[] = StringHelper::trim($cleaned, chr(0xC2) . chr(0xA0)); } } else { $result = (string) trim($source); $result = StringHelper::trim($result, chr(0xE3) . chr(0x80) . chr(0x80)); $result = StringHelper::trim($result, chr(0xC2) . chr(0xA0)); } break; case 'USERNAME': $pattern = '/[\x00-\x1F\x7F<>"\'%&]/'; if (is_array($source)) { $result = array(); // Iterate through the array foreach ($source as $eachString) { $result[] = (string) preg_replace($pattern, '', $eachString); } } else { $result = (string) preg_replace($pattern, '', $source); } break; case 'RAW': $result = $source; break; default: // Are we dealing with an array? if (is_array($source)) { foreach ($source as $key => $value) { // Filter element for XSS and other 'bad' code etc. if (is_string($value)) { $source[$key] = $this->_remove($this->_decode($value)); } } $result = $source; } else { // Or a string? if (is_string($source) && !empty($source)) { // Filter source for XSS and other 'bad' code etc. $result = $this->_remove($this->_decode($source)); } else { // Not an array or string... return the passed parameter $result = $source; } } break; } return $result; } /** * Function to punyencode utf8 mail when saving content * * @param string $text The strings to encode * * @return string The punyencoded mail * * @since 3.5 */ public function emailToPunycode($text) { $pattern = '/(("mailto:)+[\w\.\-\+]+\@[^"?]+\.+[^."?]+("|\?))/'; if (preg_match_all($pattern, $text, $matches)) { foreach ($matches[0] as $match) { $match = (string) str_replace(array('?', '"'), '', $match); $text = (string) str_replace($match, \JStringPunycode::emailToPunycode($match), $text); } } return $text; } /** * Checks an uploaded for suspicious naming and potential PHP contents which could indicate a hacking attempt. * * The options you can define are: * null_byte Prevent files with a null byte in their name (buffer overflow attack) * forbidden_extensions Do not allow these strings anywhere in the file's extension * php_tag_in_content Do not allow `<?php` tag in content * phar_stub_in_content Do not allow the `__HALT_COMPILER()` phar stub in content * shorttag_in_content Do not allow short tag `<?` in content * shorttag_extensions Which file extensions to scan for short tags in content * fobidden_ext_in_content Do not allow forbidden_extensions anywhere in content * php_ext_content_extensions Which file extensions to scan for .php in content * * This code is an adaptation and improvement of Admin Tools' UploadShield feature, * relicensed and contributed by its author. * * @param array $file An uploaded file descriptor * @param array $options The scanner options (see the code for details) * * @return boolean True of the file is safe * * @since 3.4 */ public static function isSafeFile($file, $options = array()) { $defaultOptions = array( // Null byte in file name 'null_byte' => true, // Forbidden string in extension (e.g. php matched .php, .xxx.php, .php.xxx and so on) 'forbidden_extensions' => array( 'php', 'phps', 'pht', 'phtml', 'php3', 'php4', 'php5', 'php6', 'php7', 'phar', 'inc', 'pl', 'cgi', 'fcgi', 'java', 'jar', 'py', ), // <?php tag in file contents 'php_tag_in_content' => true, // <? tag in file contents 'shorttag_in_content' => true, // __HALT_COMPILER() 'phar_stub_in_content' => true, // Which file extensions to scan for short tags 'shorttag_extensions' => array( 'inc', 'phps', 'class', 'php3', 'php4', 'php5', 'txt', 'dat', 'tpl', 'tmpl', ), // Forbidden extensions anywhere in the content 'fobidden_ext_in_content' => true, // Which file extensions to scan for .php in the content 'php_ext_content_extensions' => array('zip', 'rar', 'tar', 'gz', 'tgz', 'bz2', 'tbz', 'jpa'), ); $options = array_merge($defaultOptions, $options); // Make sure we can scan nested file descriptors $descriptors = $file; if (isset($file['name']) && isset($file['tmp_name'])) { $descriptors = self::decodeFileData( array( $file['name'], $file['type'], $file['tmp_name'], $file['error'], $file['size'], ) ); } // Handle non-nested descriptors (single files) if (isset($descriptors['name'])) { $descriptors = array($descriptors); } // Scan all descriptors detected foreach ($descriptors as $fileDescriptor) { if (!isset($fileDescriptor['name'])) { // This is a nested descriptor. We have to recurse. if (!self::isSafeFile($fileDescriptor, $options)) { return false; } continue; } $tempNames = $fileDescriptor['tmp_name']; $intendedNames = $fileDescriptor['name']; if (!is_array($tempNames)) { $tempNames = array($tempNames); } if (!is_array($intendedNames)) { $intendedNames = array($intendedNames); } $len = count($tempNames); for ($i = 0; $i < $len; $i++) { $tempName = array_shift($tempNames); $intendedName = array_shift($intendedNames); // 1. Null byte check if ($options['null_byte']) { if (strstr($intendedName, "\x00")) { return false; } } // 2. PHP-in-extension check (.php, .php.xxx[.yyy[.zzz[...]]], .xxx[.yyy[.zzz[...]]].php) if (!empty($options['forbidden_extensions'])) { $explodedName = explode('.', $intendedName); $explodedName = array_reverse($explodedName); array_pop($explodedName); $explodedName = array_map('strtolower', $explodedName); /* * DO NOT USE array_intersect HERE! array_intersect expects the two arrays to * be set, i.e. they should have unique values. */ foreach ($options['forbidden_extensions'] as $ext) { if (in_array($ext, $explodedName)) { return false; } } } // 3. File contents scanner (PHP tag in file contents) if ($options['php_tag_in_content'] || $options['shorttag_in_content'] || $options['phar_stub_in_content'] || ($options['fobidden_ext_in_content'] && !empty($options['forbidden_extensions']))) { $fp = @fopen($tempName, 'r'); if ($fp !== false) { $data = ''; while (!feof($fp)) { $data .= @fread($fp, 131072); if ($options['php_tag_in_content'] && stripos($data, '<?php') !== false) { return false; } if ($options['phar_stub_in_content'] && stripos($data, '__HALT_COMPILER()') !== false) { return false; } if ($options['shorttag_in_content']) { $suspiciousExtensions = $options['shorttag_extensions']; if (empty($suspiciousExtensions)) { $suspiciousExtensions = array( 'inc', 'phps', 'class', 'php3', 'php4', 'txt', 'dat', 'tpl', 'tmpl', ); } /* * DO NOT USE array_intersect HERE! array_intersect expects the two arrays to * be set, i.e. they should have unique values. */ $collide = false; foreach ($suspiciousExtensions as $ext) { if (in_array($ext, $explodedName)) { $collide = true; break; } } if ($collide) { // These are suspicious text files which may have the short tag (<?) in them if (strstr($data, '<?')) { return false; } } } if ($options['fobidden_ext_in_content'] && !empty($options['forbidden_extensions'])) { $suspiciousExtensions = $options['php_ext_content_extensions']; if (empty($suspiciousExtensions)) { $suspiciousExtensions = array( 'zip', 'rar', 'tar', 'gz', 'tgz', 'bz2', 'tbz', 'jpa', ); } /* * DO NOT USE array_intersect HERE! array_intersect expects the two arrays to * be set, i.e. they should have unique values. */ $collide = false; foreach ($suspiciousExtensions as $ext) { if (in_array($ext, $explodedName)) { $collide = true; break; } } if ($collide) { /* * These are suspicious text files which may have an executable * file extension in them */ foreach ($options['forbidden_extensions'] as $ext) { if (strstr($data, '.' . $ext)) { return false; } } } } /* * This makes sure that we don't accidentally skip a <?php tag if it's across * a read boundary, even on multibyte strings */ $data = substr($data, -10); } fclose($fp); } } } } return true; } /** * Method to decode a file data array. * * @param array $data The data array to decode. * * @return array * * @since 3.4 */ protected static function decodeFileData(array $data) { $result = array(); if (is_array($data[0])) { foreach ($data[0] as $k => $v) { $result[$k] = self::decodeFileData(array($data[0][$k], $data[1][$k], $data[2][$k], $data[3][$k], $data[4][$k])); } return $result; } return array('name' => $data[0], 'type' => $data[1], 'tmp_name' => $data[2], 'error' => $data[3], 'size' => $data[4]); } /** * Internal method to iteratively remove all unwanted tags and attributes * * @param string $source Input string to be 'cleaned' * * @return string 'Cleaned' version of input parameter * * @since 1.7.0 * @deprecated 4.0 Use InputFilter::remove() instead */ protected function _remove($source) { return $this->remove($source); } /** * Internal method to iteratively remove all unwanted tags and attributes * * @param string $source Input string to be 'cleaned' * * @return string 'Cleaned' version of input parameter * * @since 3.5 */ protected function remove($source) { // Check for invalid UTF-8 byte sequence if (!preg_match('//u', $source)) { // String contains invalid byte sequence, remove it $source = htmlspecialchars_decode(htmlspecialchars($source, ENT_IGNORE, 'UTF-8')); } // Iteration provides nested tag protection do { $temp = $source; $source = $this->_cleanTags($source); } while ($temp !== $source); return $source; } /** * Internal method to strip a string of certain tags * * @param string $source Input string to be 'cleaned' * * @return string 'Cleaned' version of input parameter * * @since 1.7.0 * @deprecated 4.0 Use InputFilter::cleanTags() instead */ protected function _cleanTags($source) { return $this->cleanTags($source); } /** * Internal method to strip a string of certain tags * * @param string $source Input string to be 'cleaned' * * @return string 'Cleaned' version of input parameter * * @since 3.5 */ protected function cleanTags($source) { // First, pre-process this for illegal characters inside attribute values $source = $this->_escapeAttributeValues($source); // In the beginning we don't really have a tag, so result is empty $result = ''; $offset = 0; $length = strlen($source); // Is there a tag? If so it will certainly start with a '<'. $tagOpenStartOffset = strpos($source, '<'); // Is there any close tag $tagOpenEndOffset = strpos($source, '>'); while ($offset < $length) { // Preserve '>' character which exists before related '<' if ($tagOpenEndOffset !== false && ($tagOpenStartOffset === false || $tagOpenEndOffset < $tagOpenStartOffset)) { $result .= substr($source, $offset, $tagOpenEndOffset - $offset) . '>'; $offset = $tagOpenEndOffset + 1; // Search for a new closing indicator $tagOpenEndOffset = strpos($source, '>', $offset); continue; } // Add safe text appearing before the '<' if ($tagOpenStartOffset > $offset) { $result .= substr($source, $offset, $tagOpenStartOffset - $offset); $offset = $tagOpenStartOffset; } // There is no more tags if ($tagOpenStartOffset === false && $tagOpenEndOffset === false) { $result .= substr($source, $offset, $length - $offset); $offset = $length; break; } // Remove every '<' character if '>' does not exists or we have '<>' if ($tagOpenStartOffset !== false && $tagOpenEndOffset === false || $tagOpenStartOffset + 1 == $tagOpenEndOffset) { $offset++; // Search for a new opening indicator $tagOpenStartOffset = strpos($source, '<', $offset); continue; } // Check for mal-formed tag where we have a second '<' before the '>' $nextOpenStartOffset = strpos($source, '<', $tagOpenStartOffset + 1); if ($nextOpenStartOffset !== false && $nextOpenStartOffset < $tagOpenEndOffset) { // At this point we have a mal-formed tag, skip previous '<' $offset++; // Set a new opening indicator position $tagOpenStartOffset = $nextOpenStartOffset; continue; } // Let's get some information about our tag and setup attribute pairs // Now we have something like 'span class="" style=""', '/span', 'br/', 'br /' or 'hr disabled /' $tagContent = substr($source, $offset + 1, $tagOpenEndOffset - 1 - $offset); // All ASCII whitespaces replace by 0x20 $tagNormalized = preg_replace('/\s/', ' ', $tagContent); $tagLength = strlen($tagContent); $spaceOffset = strpos($tagNormalized, ' '); // Are we an open tag or a close tag? $isClosingTag = $tagContent[0] === '/' ? 1 : 0; $isSelfClosingTag = substr($tagContent, -1) === '/' ? 1 : 0; if ($spaceOffset !== false) { $tagName = substr($tagContent, $isClosingTag, $spaceOffset - $isClosingTag); } else { $tagName = substr($tagContent, $isClosingTag, $tagLength - $isClosingTag - $isSelfClosingTag); } /* * Exclude all "non-regular" tagnames * OR no tagname * OR remove if xssauto is on and tag is blacklisted */ if (!$tagName || !preg_match("/^[a-z][a-z0-9]*$/i", $tagName) || ($this->xssAuto && in_array(strtolower($tagName), $this->tagBlacklist))) { $offset += $tagLength + 2; $tagOpenStartOffset = strpos($source, '<', $offset); $tagOpenEndOffset = strpos($source, '>', $offset); // Strip tag continue; } $attrSet = array(); /* * Time to grab any attributes from the tag... need this section in * case attributes have spaces in the values. */ while ($spaceOffset !== false && $spaceOffset + 1 < $tagLength) { $attrStartOffset = $spaceOffset + 1; // Find position of equal and open quote if (preg_match('#= *(")[^"]*(")#', $tagNormalized, $matches, PREG_OFFSET_CAPTURE, $attrStartOffset)) { $equalOffset = $matches[0][1]; $quote1Offset = $matches[1][1]; $quote2Offset = $matches[2][1]; $nextSpaceOffset = strpos($tagNormalized, ' ', $quote2Offset); } else { $equalOffset = strpos($tagNormalized, '=', $attrStartOffset); $quote1Offset = strpos($tagNormalized, '"', $attrStartOffset); $nextSpaceOffset = strpos($tagNormalized, ' ', $attrStartOffset); if ($quote1Offset !== false) { $quote2Offset = strpos($tagNormalized, '"', $quote1Offset + 1); } else { $quote2Offset = false; } } // Do we have an attribute to process? [check for equal sign] if ($tagContent[$attrStartOffset] !== '/' && ($equalOffset && $nextSpaceOffset && $nextSpaceOffset < $equalOffset || !$equalOffset)) { // Search for attribute without value, ex: 'checked/' or 'checked ' if ($nextSpaceOffset) { $attrEndOffset = $nextSpaceOffset; } else { $attrEndOffset = strpos($tagContent, '/', $attrStartOffset); if ($attrEndOffset === false) { $attrEndOffset = $tagLength; } } // If there is an ending, use this, if not, do not worry. if ($attrEndOffset > $attrStartOffset) { $attrSet[] = substr($tagContent, $attrStartOffset, $attrEndOffset - $attrStartOffset); } } elseif ($equalOffset !== false) { /* * If the attribute value is wrapped in quotes we need to grab the substring from * the closing quote, otherwise grab until the next space. */ if ($quote1Offset !== false && $quote2Offset !== false) { // Add attribute, ex: 'class="body abc"' $attrSet[] = substr($tagContent, $attrStartOffset, $quote2Offset + 1 - $attrStartOffset); } else { if ($nextSpaceOffset) { $attrEndOffset = $nextSpaceOffset; } else { $attrEndOffset = $tagLength; } // Add attribute, ex: 'class=body' $attrSet[] = substr($tagContent, $attrStartOffset, $attrEndOffset - $attrStartOffset); } } $spaceOffset = $nextSpaceOffset; } // Is our tag in the user input array? $tagFound = in_array(strtolower($tagName), $this->tagsArray); // If the tag is allowed let's append it to the output string. if ((!$tagFound && $this->tagsMethod) || ($tagFound && !$this->tagsMethod)) { // Reconstruct tag with allowed attributes if ($isClosingTag) { $result .= "</$tagName>"; } else { $attrSet = $this->_cleanAttributes($attrSet); // Open or single tag $result .= '<' . $tagName; if ($attrSet) { $result .= ' ' . implode(' ', $attrSet); } // Reformat single tags to XHTML if (strpos($source, "</$tagName>", $tagOpenStartOffset) !== false) { $result .= '>'; } else { $result .= ' />'; } } } $offset += $tagLength + 2; if ($offset < $length) { // Find next tag's start and continue iteration $tagOpenStartOffset = strpos($source, '<', $offset); $tagOpenEndOffset = strpos($source, '>', $offset); } } return $result; } /** * Internal method to strip a tag of certain attributes * * @param array $attrSet Array of attribute pairs to filter * * @return array Filtered array of attribute pairs * * @since 1.7.0 * @deprecated 4.0 Use InputFilter::cleanAttributes() instead */ protected function _cleanAttributes($attrSet) { return $this->cleanAttributes($attrSet); } /** * Escape < > and " inside attribute values * * @param string $source The source string. * * @return string Filtered string * * @since 3.5 */ protected function escapeAttributeValues($source) { $alreadyFiltered = ''; $remainder = $source; $badChars = array('<', '"', '>'); $escapedChars = array('<', '"', '>'); /* * Process each portion based on presence of =" and "<space>, "/>, or "> * See if there are any more attributes to process */ while (preg_match('#<[^>]*?=\s*?(\"|\')#s', $remainder, $matches, PREG_OFFSET_CAPTURE)) { // Get the portion before the attribute value $quotePosition = $matches[0][1]; $nextBefore = $quotePosition + strlen($matches[0][0]); /* * Figure out if we have a single or double quote and look for the matching closing quote * Closing quote should be "/>, ">, "<space>, or " at the end of the string */ $quote = substr($matches[0][0], -1); $pregMatch = ($quote == '"') ? '#(\"\s*/\s*>|\"\s*>|\"\s+|\"$)#' : "#(\'\s*/\s*>|\'\s*>|\'\s+|\'$)#"; // Get the portion after attribute value if (preg_match($pregMatch, substr($remainder, $nextBefore), $matches, PREG_OFFSET_CAPTURE)) { // We have a closing quote $nextAfter = $nextBefore + $matches[0][1]; } else { // No closing quote $nextAfter = strlen($remainder); } // Get the actual attribute value $attributeValue = substr($remainder, $nextBefore, $nextAfter - $nextBefore); // Escape bad chars $attributeValue = str_replace($badChars, $escapedChars, $attributeValue); $attributeValue = $this->_stripCSSExpressions($attributeValue); $alreadyFiltered .= substr($remainder, 0, $nextBefore) . $attributeValue . $quote; $remainder = substr($remainder, $nextAfter + 1); } // At this point, we just have to return the $alreadyFiltered and the $remainder return $alreadyFiltered . $remainder; } /** * Try to convert to plaintext * * @param string $source The source string. * * @return string Plaintext string * * @since 1.7.0 * @deprecated 4.0 Use InputFilter::decode() instead */ protected function _decode($source) { return $this->decode($source); } /** * Try to convert to plaintext * * @param string $source The source string. * * @return string Plaintext string * * @since 3.5 */ protected function decode($source) { static $ttr; if (!is_array($ttr)) { // Entity decode $trans_tbl = get_html_translation_table(HTML_ENTITIES, ENT_COMPAT, 'ISO-8859-1'); foreach ($trans_tbl as $k => $v) { $ttr[$v] = utf8_encode($k); } } $source = strtr($source, $ttr); // Convert decimal $source = preg_replace_callback('/&#(\d+);/m', function($m) { return utf8_encode(chr($m[1])); }, $source ); // Convert hex $source = preg_replace_callback('/&#x([a-f0-9]+);/mi', function($m) { return utf8_encode(chr(hexdec($m[1]))); }, $source ); return $source; } /** * Escape < > and " inside attribute values * * @param string $source The source string. * * @return string Filtered string * * @since 1.7.0 * @deprecated 4.0 Use InputFilter::escapeAttributeValues() instead */ protected function _escapeAttributeValues($source) { return $this->escapeAttributeValues($source); } /** * Remove CSS Expressions in the form of `<property>:expression(...)` * * @param string $source The source string. * * @return string Filtered string * * @since 1.7.0 * @deprecated 4.0 Use InputFilter::stripCSSExpressions() instead */ protected function _stripCSSExpressions($source) { return $this->stripCSSExpressions($source); } /** * Recursively strip Unicode Supplementary Characters from the source. Not: objects cannot be filtered. * * @param mixed $source The data to filter * * @return mixed The filtered result * * @since 3.5 */ protected function stripUSC($source) { if (is_object($source)) { return $source; } if (is_array($source)) { $filteredArray = array(); foreach ($source as $k => $v) { $filteredArray[$k] = $this->stripUSC($v); } return $filteredArray; } return preg_replace('/[\xF0-\xF7].../s', "\xE2\xAF\x91", $source); } }
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