| | |
| | | * |
| | | * SYNOPSIS: |
| | | * |
| | | * washtml::wash($html, $config, $full); |
| | | * $washer = new washtml($config); |
| | | * $washer->wash($html); |
| | | * It return a sanityzed string of the $html parameter without html and head tags. |
| | | * $html is a string containing the html code to wash. |
| | | * $config is an array containing options: |
| | |
| | | * $config['show_washed'] is a boolean to include washed out attributes as x-washed |
| | | * $config['cid_map'] is an array where cid urls index urls to replace them. |
| | | * $config['charset'] is a string containing the charset of the HTML document if it is not defined in it. |
| | | * $full is a reference to a boolean that is set to true if no remote images are removed. (FE: show remote images link) |
| | | * $washer->extlinks is a reference to a boolean that is set to true if remote images were removed. (FE: show remote images link) |
| | | * |
| | | * INTERNALS: |
| | | * |
| | | * Only tags and attributes in the globals $html_elements and $html_attributes |
| | | * Only tags and attributes in the static lists $html_elements and $html_attributes |
| | | * are kept, inline styles are also filtered: all style identifiers matching |
| | | * /[a-z\-]/i are allowed. Values matching colors, sizes, /[a-z\-]/i and safe |
| | | * urls if allowed and cid urls if mapped are kept. |
| | |
| | | |
| | | class washtml |
| | | { |
| | | /* Allowed HTML elements (default) */ |
| | | static $html_elements = array('a', 'abbr', 'acronym', 'address', 'area', 'b', 'basefont', 'bdo', 'big', 'blockquote', 'br', 'caption', 'center', 'cite', 'code', 'col', 'colgroup', 'dd', 'del', 'dfn', 'dir', 'div', 'dl', 'dt', 'em', 'fieldset', 'font', 'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'hr', 'i', 'ins', 'label', 'legend', 'li', 'map', 'menu', 'nobr', 'ol', 'p', 'pre', 'q', 's', 'samp', 'small', 'span', 'strike', 'strong', 'sub', 'sup', 'table', 'tbody', 'td', 'tfoot', 'th', 'thead', 'tr', 'tt', 'u', 'ul', 'var', 'img'); |
| | | |
| | | /* Ignore these HTML tags but process their content */ |
| | | static $ignore_elements = array('html', 'head', 'body'); |
| | | |
| | | /* Allowed HTML attributes */ |
| | | static $html_attribs = array('name', 'class', 'title', 'alt', 'width', 'height', 'align', 'nowrap', 'col', 'row', 'id', 'rowspan', 'colspan', 'cellspacing', 'cellpadding', 'valign', 'bgcolor', 'color', 'border', 'bordercolorlight', 'bordercolordark', 'face', 'marginwidth', 'marginheight', 'axis', 'border', 'abbr', 'char', 'charoff', 'clear', 'compact', 'coords', 'vspace', 'hspace', 'cellborder', 'size', 'lang', 'dir', 'background'); |
| | | |
| | | /* State for linked objects in HTML */ |
| | | public $extlinks = false; |
| | | |
| | | /* Current settings */ |
| | | private $config = array(); |
| | | |
| | | /* Registered callback functions for tags */ |
| | | private $handlers = array(); |
| | | |
| | | /* Allowed HTML elements */ |
| | | static $html_elements = array('a', 'abbr', 'acronym', 'address', 'area', 'b', 'basefont', 'bdo', 'big', 'blockquote', 'body', 'br', 'caption', 'center', 'cite', 'code', 'col', 'colgroup', 'dd', 'del', 'dfn', 'dir', 'div', 'dl', 'dt', 'em', 'fieldset', 'font', 'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'hr', 'i', 'ins', 'label', 'legend', 'li', 'map', 'menu', 'ol', 'p', 'pre', 'q', 's', 'samp', 'small', 'span', 'strike', 'strong', 'sub', 'sup', 'table', 'tbody', 'td', 'tfoot', 'th', 'thead', 'title', 'tr', 'tt', 'u', 'ul', 'var', 'img'); |
| | | private $_html_elements = array(); |
| | | |
| | | /* Ignore these HTML tags but process their content */ |
| | | private $_ignore_elements = array(); |
| | | |
| | | /* Allowed HTML attributes */ |
| | | static $html_attribs = array('name', 'class', 'title', 'alt', 'width', 'height', 'align', 'nowrap', 'col', 'row', 'id', 'rowspan', 'colspan', 'cellspacing', 'cellpadding', 'valign', 'bgcolor', 'color', 'border', 'bordercolorlight', 'bordercolordark', 'face', 'marginwidth', 'marginheight', 'axis', 'border', 'abbr', 'char', 'charoff', 'clear', 'compact', 'coords', 'vspace', 'hspace', 'cellborder', 'size', 'lang', 'dir'); |
| | | private $_html_attribs = array(); |
| | | |
| | | |
| | | /* Constructor */ |
| | | public function __construct($p = array()) { |
| | | $this->_html_elements = array_flip((array)$p['html_elements']) + array_flip(self::$html_elements) ; |
| | | $this->_html_attribs = array_flip((array)$p['html_attribs']) + array_flip(self::$html_attribs); |
| | | $this->_ignore_elements = array_flip((array)$p['ignore_elements']) + array_flip(self::$ignore_elements); |
| | | unset($p['html_elements'], $p['html_attribs'], $p['ignore_elements']); |
| | | $this->config = $p + array('show_washed'=>true, 'allow_remote'=>false, 'cid_map'=>array()); |
| | | } |
| | | |
| | | /* Register a callback function for a certain tag */ |
| | | public function add_callback($tagName, $callback) |
| | | { |
| | | $this->handlers[$tagName] = $callback; |
| | | } |
| | | |
| | | /* Check CSS style */ |
| | | static function wash_style($style, $config, &$full) { |
| | | private function wash_style($style) { |
| | | $s = ''; |
| | | |
| | | foreach(explode(';', $style) as $declaration) { |
| | |
| | | '|#[0-9a-f]{3,6}|[a-z0-9\-]+'. |
| | | ')\s*/i', $str, $match)) { |
| | | if($match[2]) { |
| | | if(preg_match('/^(http|https|ftp):.*$/i', $match[2], $url)) { |
| | | if($config['allow_remote']) |
| | | if($src = $this->config['cid_map'][$match[2]]) |
| | | $value .= ' url(\''.htmlspecialchars($src, ENT_QUOTES) . '\')'; |
| | | else if(preg_match('/^(http|https|ftp):.*$/i', $match[2], $url)) { |
| | | if($this->config['allow_remote']) |
| | | $value .= ' url(\''.htmlspecialchars($url[0], ENT_QUOTES).'\')'; |
| | | else |
| | | $full = false; |
| | | } else if(preg_match('/^cid:(.*)$/i', $match[2], $cid)) |
| | | $value .= ' url(\''.htmlspecialchars($config['cid_map']['cid:'.$cid[1]], ENT_QUOTES) . '\')'; |
| | | $this->extlinks = true; |
| | | } |
| | | } else if($match[0] != 'url' && $match[0] != 'rbg')//whitelist ? |
| | | $value .= ' ' . $match[0]; |
| | | $str = substr($str, strlen($match[0])); |
| | |
| | | } |
| | | |
| | | /* Take a node and return allowed attributes and check values */ |
| | | static function wash_attribs($node, $config, &$full) { |
| | | private function wash_attribs($node) { |
| | | $t = ''; |
| | | $washed; |
| | | |
| | | foreach($node->attributes as $key => $plop) { |
| | | $key = strtolower($key); |
| | | $value = $node->getAttribute($key); |
| | | if((in_array($key, self::$html_attribs)) || |
| | | if(isset($this->_html_attribs[$key]) || |
| | | ($key == 'href' && preg_match('/^(http|https|ftp|mailto):.*/i', $value))) |
| | | $t .= ' ' . $key . '="' . htmlspecialchars($value, ENT_QUOTES) . '"'; |
| | | else if($key == 'style' && ($style = self::wash_style($value, $config, $full))) |
| | | else if($key == 'style' && ($style = $this->wash_style($value))) |
| | | $t .= ' style="' . $style . '"'; |
| | | else if($key == 'src' && strtolower($node->tagName) == 'img') { //check tagName anyway |
| | | if(preg_match('/^(http|https|ftp):.*/i', $value)) { |
| | | if($config['allow_remote']) |
| | | if($src = $this->config['cid_map'][$value]) { |
| | | $t .= ' ' . $key . '="' . htmlspecialchars($src, ENT_QUOTES) . '"'; |
| | | } |
| | | else if(preg_match('/^(http|https|ftp):.*/i', $value)) { |
| | | if($this->config['allow_remote']) |
| | | $t .= ' ' . $key . '="' . htmlspecialchars($value, ENT_QUOTES) . '"'; |
| | | else { |
| | | $full = false; |
| | | if ($config['blocked_src']) |
| | | $t .= ' src="' . htmlspecialchars($config['blocked_src'], ENT_QUOTES) . '"'; |
| | | $this->extlinks = true; |
| | | if ($this->config['blocked_src']) |
| | | $t .= ' src="' . htmlspecialchars($this->config['blocked_src'], ENT_QUOTES) . '"'; |
| | | } |
| | | } else if(preg_match('/^cid:(.*)$/i', $value, $cid)) |
| | | $t .= ' ' . $key . '="' . htmlspecialchars($config['cid_map']['cid:'.$cid[1]], ENT_QUOTES) . '"'; |
| | | } |
| | | } else |
| | | $washed .= ($washed?' ':'') . $key; |
| | | } |
| | | return $t . ($washed && $config['show_washed']?' x-washed="'.$washed.'"':''); |
| | | return $t . ($washed && $this->config['show_washed']?' x-washed="'.$washed.'"':''); |
| | | } |
| | | |
| | | /* The main loop that recurse on a node tree. |
| | | * It output only allowed tags with allowed attributes |
| | | * and allowed inline styles */ |
| | | static function dumpHtml($node, $config, &$full) { |
| | | private function dumpHtml($node) { |
| | | if(!$node->hasChildNodes()) |
| | | return ''; |
| | | |
| | |
| | | switch($node->nodeType) { |
| | | case XML_ELEMENT_NODE: //Check element |
| | | $tagName = strtolower($node->tagName); |
| | | if(in_array($tagName, self::$html_elements)) { |
| | | $content = self::dumpHtml($node, $config, $full); |
| | | $dump .= '<' . $tagName . self::wash_attribs($node, $config, $full) . |
| | | if($callback = $this->handlers[$tagName]) { |
| | | $dump .= call_user_func($callback, $tagName, $this->wash_attribs($node), $this->dumpHtml($node)); |
| | | } else if(isset($this->_html_elements[$tagName])) { |
| | | $content = $this->dumpHtml($node); |
| | | $dump .= '<' . $tagName . $this->wash_attribs($node) . |
| | | ($content?">$content</$tagName>":' />'); |
| | | } else if($tagName == 'html' || $tagName == 'body') { |
| | | $dump .= self::dumpHtml($node, $config, $full); //Just ignored |
| | | } else if(isset($this->_ignore_elements[$tagName])) { |
| | | $dump .= '<!-- ' . htmlspecialchars($tagName, ENT_QUOTES) . ' ignored -->'; |
| | | $dump .= $this->dumpHtml($node); //Just ignored |
| | | } else |
| | | $dump .= '<!-- ' . htmlspecialchars($tagName, ENT_QUOTES) . ' not allowed -->'; |
| | | break; |
| | | case XML_CDATA_SECTION_NODE: |
| | | $dump .= $node->nodeValue; |
| | | break; |
| | | case XML_TEXT_NODE: |
| | | $dump .= htmlspecialchars($node->nodeValue); |
| | | break; |
| | | case XML_HTML_DOCUMENT_NODE: |
| | | $dump .= self::dumpHtml($node, $config, $full); |
| | | $dump .= $this->dumpHtml($node); |
| | | break; |
| | | case XML_DOCUMENT_TYPE_NODE: break; |
| | | case XML_DOCUMENT_TYPE_NODE: |
| | | break; |
| | | default: |
| | | $dump . '<!-- node type ' . $node->nodeType . ' -->'; |
| | | } |
| | | } while($node = $node->nextSibling); |
| | | |
| | |
| | | |
| | | /* Main function, give it untrusted HTML, tell it if you allow loading |
| | | * remote images and give it a map to convert "cid:" urls. */ |
| | | static function wash($html, $config=array(), &$full=true) { |
| | | $config += array('show_washed'=>true, 'allow_remote'=>false, 'cid_map'=>array()); |
| | | public function wash($html) { |
| | | //Charset seems to be ignored (probably if defined in the HTML document) |
| | | $node = new DOMDocument('1.0', $config['charset']); |
| | | $full = true; |
| | | if (function_exists('mb_convert_encoding')) |
| | | $html = mb_convert_encoding($html, 'HTML-ENTITIES', $config['charset']); |
| | | $node = new DOMDocument('1.0', $this->config['charset']); |
| | | $this->extlinks = false; |
| | | @$node->loadHTML($html); |
| | | return self::dumpHtml($node, $config, $full); |
| | | return $this->dumpHtml($node); |
| | | } |
| | | |
| | | } |