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- <?php
- class rcube_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', 'wbr', 'img',
- 'video', 'source',
- // form elements
- 'button', 'input', 'textarea', 'select', 'option', 'optgroup',
- // SVG
- 'svg', 'altglyph', 'altglyphdef', 'altglyphitem', 'animate',
- 'animatecolor', 'animatetransform', 'circle', 'clippath', 'defs', 'desc',
- 'ellipse', 'font', 'g', 'glyph', 'glyphref', 'hkern', 'image', 'line',
- 'lineargradient', 'marker', 'mask', 'mpath', 'path', 'pattern',
- 'polygon', 'polyline', 'radialgradient', 'rect', 'set', 'stop', 'switch', 'symbol',
- 'text', 'textpath', 'tref', 'tspan', 'use', 'view', 'vkern', 'filter',
- // SVG Filters
- 'feblend', 'fecolormatrix', 'fecomponenttransfer', 'fecomposite',
- 'feconvolvematrix', 'fediffuselighting', 'fedisplacementmap',
- 'feflood', 'fefunca', 'fefuncb', 'fefuncg', 'fefuncr', 'fegaussianblur',
- 'feimage', 'femerge', 'femergenode', 'femorphology', 'feoffset',
- 'fespecularlighting', 'fetile', 'feturbulence',
- // MathML
- 'math', 'menclose', 'merror', 'mfenced', 'mfrac', 'mglyph', 'mi', 'mlabeledtr',
- 'mmuliscripts', 'mn', 'mo', 'mover', 'mpadded', 'mphantom', 'mroot', 'mrow',
- 'ms', 'mspace', 'msqrt', 'mstyle', 'msub', 'msup', 'msubsup', 'mtable', 'mtd',
- 'mtext', 'mtr', 'munder', 'munderover', 'maligngroup', 'malignmark',
- 'mprescripts', 'semantics', 'annotation', 'annotation-xml', 'none',
- 'infinity', 'matrix', 'matrixrow', 'ci', 'cn', 'sep', 'apply',
- 'plus', 'minus', 'eq', 'power', 'times', 'divide', 'csymbol', 'root',
- 'bvar', 'lowlimit', 'uplimit',
- );
- /* Ignore these HTML tags and their content */
- static $ignore_elements = array('script', 'applet', 'embed', 'object', 'style');
- /* 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', 'usemap', 'shape', 'media',
- 'background', 'src', 'poster', 'href',
- // attributes of form elements
- 'type', 'rows', 'cols', 'disabled', 'readonly', 'checked', 'multiple', 'value',
- // SVG
- 'accent-height', 'accumulate', 'additive', 'alignment-baseline', 'alphabetic',
- 'ascent', 'attributename', 'attributetype', 'azimuth', 'basefrequency', 'baseprofile',
- 'baseline-shift', 'begin', 'bias', 'by', 'clip', 'clip-path', 'clip-rule',
- 'color', 'color-interpolation', 'color-interpolation-filters', 'color-profile',
- 'color-rendering', 'cx', 'cy', 'd', 'dx', 'dy', 'diffuseconstant', 'direction',
- 'display', 'divisor', 'dur', 'edgemode', 'elevation', 'end', 'fill', 'fill-opacity',
- 'fill-rule', 'filter', 'flood-color', 'flood-opacity', 'font-family', 'font-size',
- 'font-size-adjust', 'font-stretch', 'font-style', 'font-variant', 'font-weight', 'from',
- 'fx', 'fy', 'g1', 'g2', 'glyph-name', 'glyphref', 'gradientunits', 'gradienttransform',
- 'image-rendering', 'in', 'in2', 'k', 'k1', 'k2', 'k3', 'k4', 'kerning', 'keypoints',
- 'keysplines', 'keytimes', 'lengthadjust', 'letter-spacing', 'kernelmatrix',
- 'kernelunitlength', 'lighting-color', 'local', 'marker-end', 'marker-mid',
- 'marker-start', 'markerheight', 'markerunits', 'markerwidth', 'maskcontentunits',
- 'maskunits', 'max', 'mask', 'mode', 'min', 'numoctaves', 'offset', 'operator',
- 'opacity', 'order', 'orient', 'orientation', 'origin', 'overflow', 'paint-order',
- 'path', 'pathlength', 'patterncontentunits', 'patterntransform', 'patternunits',
- 'points', 'preservealpha', 'r', 'rx', 'ry', 'radius', 'refx', 'refy', 'repeatcount',
- 'repeatdur', 'restart', 'rotate', 'scale', 'seed', 'shape-rendering', 'show', 'specularconstant',
- 'specularexponent', 'spreadmethod', 'stddeviation', 'stitchtiles', 'stop-color',
- 'stop-opacity', 'stroke-dasharray', 'stroke-dashoffset', 'stroke-linecap',
- 'stroke-linejoin', 'stroke-miterlimit', 'stroke-opacity', 'stroke', 'stroke-width',
- 'surfacescale', 'targetx', 'targety', 'transform', 'text-anchor', 'text-decoration',
- 'text-rendering', 'textlength', 'to', 'u1', 'u2', 'unicode', 'values', 'viewbox',
- 'visibility', 'vert-adv-y', 'version', 'vert-origin-x', 'vert-origin-y', 'word-spacing',
- 'wrap', 'writing-mode', 'xchannelselector', 'ychannelselector', 'x', 'x1', 'x2',
- 'xmlns', 'y', 'y1', 'y2', 'z', 'zoomandpan',
- // MathML
- 'accent', 'accentunder', 'bevelled', 'close', 'columnalign', 'columnlines',
- 'columnspan', 'denomalign', 'depth', 'display', 'displaystyle', 'encoding', 'fence',
- 'frame', 'largeop', 'length', 'linethickness', 'lspace', 'lquote',
- 'mathbackground', 'mathcolor', 'mathsize', 'mathvariant', 'maxsize',
- 'minsize', 'movablelimits', 'notation', 'numalign', 'open', 'rowalign',
- 'rowlines', 'rowspacing', 'rowspan', 'rspace', 'rquote', 'scriptlevel',
- 'scriptminsize', 'scriptsizemultiplier', 'selection', 'separator',
- 'separators', 'stretchy', 'subscriptshift', 'supscriptshift', 'symmetric', 'voffset',
- 'fontsize', 'fontweight', 'fontstyle', 'fontfamily', 'groupalign', 'edge', 'side',
- );
- /* Elements which could be empty and be returned in short form (<tag />) */
- static $void_elements = array('area', 'base', 'br', 'col', 'command', 'embed', 'hr',
- 'img', 'input', 'keygen', 'link', 'meta', 'param', 'source', 'track', 'wbr',
- // MathML
- 'sep', 'infinity', 'in', 'plus', 'eq', 'power', 'times', 'divide', 'root',
- 'maligngroup', 'none', 'mprescripts',
- );
- /* 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 */
- private $_html_elements = array();
- /* Ignore these HTML tags but process their content */
- private $_ignore_elements = array();
- /* Elements which could be empty and be returned in short form (<tag />) */
- private $_void_elements = array();
- /* Allowed HTML attributes */
- private $_html_attribs = array();
- /* Max nesting level */
- private $max_nesting_level;
- private $is_xml = false;
- /**
- * Class constructor
- */
- public function __construct($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);
- $this->_void_elements = array_flip((array)$p['void_elements']) + array_flip(self::$void_elements);
- unset($p['html_elements'], $p['html_attribs'], $p['ignore_elements'], $p['void_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] = $callback;
- }
- /**
- * Check CSS style
- */
- private function wash_style($style)
- {
- $result = array();
- // Remove unwanted white-space characters so regular expressions below work better
- $style = preg_replace('/[\n\r\s\t]+/', ' ', $style);
- foreach (explode(';', $style) as $declaration) {
- if (preg_match('/^\s*([a-z\-]+)\s*:\s*(.*)\s*$/i', $declaration, $match)) {
- $cssid = $match[1];
- $str = $match[2];
- $value = '';
- foreach ($this->explode_style($str) as $val) {
- if (preg_match('/^url\(/i', $val)) {
- if (preg_match('/^url\(\s*[\'"]?([^\'"\)]*)[\'"]?\s*\)/iu', $val, $match)) {
- if ($url = $this->wash_uri($match[1])) {
- $value .= ' url(' . htmlspecialchars($url, ENT_QUOTES) . ')';
- }
- }
- }
- else if (!preg_match('/^(behavior|expression)/i', $val)) {
- // Set position:fixed to position:absolute for security (#5264)
- if (!strcasecmp($cssid, 'position') && !strcasecmp($val, 'fixed')) {
- $val = 'absolute';
- }
- // whitelist ?
- $value .= ' ' . $val;
- // #1488535: Fix size units, so width:800 would be changed to width:800px
- if (preg_match('/^(left|right|top|bottom|width|height)/i', $cssid)
- && preg_match('/^[0-9]+$/', $val)
- ) {
- $value .= 'px';
- }
- }
- }
- if (isset($value[0])) {
- $result[] = $cssid . ':' . $value;
- }
- }
- }
- return implode('; ', $result);
- }
- /**
- * Take a node and return allowed attributes and check values
- */
- private function wash_attribs($node)
- {
- $result = '';
- $washed = array();
- foreach ($node->attributes as $name => $attr) {
- $key = strtolower($name);
- $value = $attr->nodeValue;
- if ($key == 'style' && ($style = $this->wash_style($value))) {
- // replace double quotes to prevent syntax error and XSS issues (#1490227)
- $result .= ' style="' . str_replace('"', '"', $style) . '"';
- }
- else if (isset($this->_html_attribs[$key])) {
- $value = trim($value);
- $out = null;
- // in SVG to/from attribs may contain anything, including URIs
- if ($key == 'to' || $key == 'from') {
- $key = strtolower($node->getAttribute('attributeName'));
- if ($key && !isset($this->_html_attribs[$key])) {
- $key = null;
- }
- }
- if ($this->is_image_attribute($node->tagName, $key)) {
- $out = $this->wash_uri($value, true);
- }
- else if ($this->is_link_attribute($node->tagName, $key)) {
- if (!preg_match('!^(javascript|vbscript|data:text)!i', $value)
- && preg_match('!^([a-z][a-z0-9.+-]+:|//|#).+!i', $value)
- ) {
- $out = $value;
- }
- }
- else if ($this->is_funciri_attribute($node->tagName, $key)) {
- if (preg_match('/^[a-z:]*url\(/i', $val)) {
- if (preg_match('/^([a-z:]*url)\(\s*[\'"]?([^\'"\)]*)[\'"]?\s*\)/iu', $value, $match)) {
- if ($url = $this->wash_uri($match[2])) {
- $result .= ' ' . $attr->nodeName . '="' . $match[1] . '(' . htmlspecialchars($url, ENT_QUOTES) . ')'
- . substr($val, strlen($match[0])) . '"';
- continue;
- }
- }
- else {
- $out = $value;
- }
- }
- else {
- $out = $value;
- }
- }
- else if ($key) {
- $out = $value;
- }
- if ($out !== null && $out !== '') {
- $result .= ' ' . $attr->nodeName . '="' . htmlspecialchars($out, ENT_QUOTES) . '"';
- }
- else if ($value) {
- $washed[] = htmlspecialchars($attr->nodeName, ENT_QUOTES);
- }
- }
- else {
- $washed[] = htmlspecialchars($attr->nodeName, ENT_QUOTES);
- }
- }
- if (!empty($washed) && $this->config['show_washed']) {
- $result .= ' x-washed="' . implode(' ', $washed) . '"';
- }
- return $result;
- }
- /**
- * Wash URI value
- */
- private function wash_uri($uri, $blocked_source = false)
- {
- if ((isset($this->config['cid_map'][$uri]) && $src = $this->config['cid_map'][$uri])
- || (isset($this->config['cid_map'][$this->config['base_url'].$uri]) && $src = $this->config['cid_map'][$this->config['base_url'].$uri])
- ) {
- return $src;
- }
- // allow url(#id) used in SVG
- if ($uri[0] == '#') {
- return $uri;
- }
- if (preg_match('/^(http|https|ftp):.+/i', $uri)) {
- if ($this->config['allow_remote']) {
- return $uri;
- }
- $this->extlinks = true;
- if ($blocked_source && $this->config['blocked_src']) {
- return $this->config['blocked_src'];
- }
- }
- else if (preg_match('/^data:image.+/i', $uri)) { // RFC2397
- return $uri;
- }
- }
- /**
- * Check it the tag/attribute may contain an URI
- */
- private function is_link_attribute($tag, $attr)
- {
- return ($tag == 'a' || $tag == 'area') && $attr == 'href';
- }
- /**
- * Check it the tag/attribute may contain an image URI
- */
- private function is_image_attribute($tag, $attr)
- {
- return $attr == 'background'
- || $attr == 'color-profile' // SVG
- || ($attr == 'poster' && $tag == 'video')
- || ($attr == 'src' && preg_match('/^(img|source|input|video|audio)$/i', $tag))
- || ($tag == 'image' && $attr == 'href'); // SVG
- }
- /**
- * Check it the tag/attribute may contain a FUNCIRI value
- */
- private function is_funciri_attribute($tag, $attr)
- {
- return in_array($attr, array('fill', 'filter', 'stroke', 'marker-start',
- 'marker-end', 'marker-mid', 'clip-path', 'mask', 'cursor'));
- }
- /**
- * The main loop that recurse on a node tree.
- * It output only allowed tags with allowed attributes and allowed inline styles
- *
- * @param DOMNode $node HTML element
- * @param int $level Recurrence level (safe initial value found empirically)
- */
- private function dumpHtml($node, $level = 20)
- {
- if (!$node->hasChildNodes()) {
- return '';
- }
- $level++;
- if ($this->max_nesting_level > 0 && $level == $this->max_nesting_level - 1) {
- // log error message once
- if (!$this->max_nesting_level_error) {
- $this->max_nesting_level_error = true;
- var_dump("Maximum nesting level exceeded (xdebug.max_nesting_level={$this->max_nesting_level})");
- }
- return '<!-- ignored -->';
- }
- $node = $node->firstChild;
- $dump = '';
- do {
- switch ($node->nodeType) {
- case XML_ELEMENT_NODE: //Check element
- var_dump($node->tagName);
- $tagName = strtolower($node->tagName);
- if (isset($this->handlers[$tagName]) && $callback = $this->handlers[$tagName]) {
- $dump .= call_user_func($callback, $tagName,
- $this->wash_attribs($node), $this->dumpHtml($node, $level), $this);
- } else if (isset($this->_html_elements[$tagName])) {
- $content = $this->dumpHtml($node, $level);
- $dump .= '<' . $node->tagName;
- if ($tagName == 'svg') {
- $xpath = new DOMXPath($node->ownerDocument);
- foreach ($xpath->query('namespace::*') as $ns) {
- if ($ns->nodeName != 'xmlns:xml') {
- $dump .= ' ' . $ns->nodeName . '="' . $ns->nodeValue . '"';
- }
- }
- }
- else if ($tagName == 'textarea' && strpos($content, '<') !== false) {
- $content = htmlspecialchars($content, ENT_QUOTES);
- }
- $dump .= $this->wash_attribs($node);
- if ($content === '' && ($this->is_xml || isset($this->_void_elements[$tagName]))) {
- $dump .= ' />';
- }
- else {
- $dump .= '>' . $content . '</' . $node->tagName . '>';
- }
- }
- else if (isset($this->_ignore_elements[$tagName])) {
- $dump .= '<!-- ' . htmlspecialchars($node->tagName, ENT_QUOTES) . ' not allowed -->';
- }
- else {
- $dump .= '<!-- ' . htmlspecialchars($node->tagName, ENT_QUOTES) . ' ignored -->';
- $dump .= $this->dumpHtml($node, $level); // ignore tags not its content
- }
- 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 .= $this->dumpHtml($node, $level);
- break;
- }
- }
- while($node = $node->nextSibling);
- return $dump;
- }
- /**
- * Main function, give it untrusted HTML, tell it if you allow loading
- * remote images and give it a map to convert "cid:" urls.
- */
- public function wash($html)
- {
- // Charset seems to be ignored (probably if defined in the HTML document)
- $node = new DOMDocument('1.0', $this->config['charset']);
- $this->extlinks = false;
- $html = $this->cleanup($html);
- // Find base URL for images
- if (preg_match('/<base\s+href=[\'"]*([^\'"]+)/is', $html, $matches)) {
- $this->config['base_url'] = $matches[1];
- }
- else {
- $this->config['base_url'] = '';
- }
- // Detect max nesting level (for dumpHTML) (#1489110)
- $this->max_nesting_level = (int) @ini_get('xdebug.max_nesting_level');
- // SVG need to be parsed as XML
- $this->is_xml = stripos($html, '<html') === false && stripos($html, '<svg') !== false;
- $method = $this->is_xml ? 'loadXML' : 'loadHTML';
- $options = 0;
- // Use optimizations if supported
- if (PHP_VERSION_ID >= 50400) {
- $options = LIBXML_PARSEHUGE | LIBXML_COMPACT | LIBXML_NONET;
- @$node->{$method}($html, $options);
- }
- else {
- @$node->{$method}($html);
- }
- return $this->dumpHtml($node);
- }
- /**
- * Getter for config parameters
- */
- public function get_config($prop)
- {
- return $this->config[$prop];
- }
- /**
- * Clean HTML input
- */
- private function cleanup($html)
- {
- $html = trim($html);
- // special replacements (not properly handled by washtml class)
- $html_search = array(
- // space(s) between <NOBR>
- '/(<\/nobr>)(\s+)(<nobr>)/i',
- // PHP bug #32547 workaround: remove title tag
- '/<title[^>]*>[^<]*<\/title>/i',
- // remove <!doctype> before BOM (#1490291)
- '/<\!doctype[^>]+>[^<]*/im',
- // byte-order mark (only outlook?)
- '/^(\0\0\xFE\xFF|\xFF\xFE\0\0|\xFE\xFF|\xFF\xFE|\xEF\xBB\xBF)/',
- // washtml/DOMDocument cannot handle xml namespaces
- '/<html\s[^>]+>/i',
- );
- $html_replace = array(
- '\\1'.' '.'\\3',
- '',
- '',
- '',
- '<html>',
- );
- $html = preg_replace($html_search, $html_replace, trim($html));
- // Replace all of those weird MS Word quotes and other high characters
- $badwordchars = array(
- "\xe2\x80\x98", // left single quote
- "\xe2\x80\x99", // right single quote
- "\xe2\x80\x9c", // left double quote
- "\xe2\x80\x9d", // right double quote
- "\xe2\x80\x94", // em dash
- "\xe2\x80\xa6" // elipses
- );
- $fixedwordchars = array(
- "'",
- "'",
- '"',
- '"',
- '—',
- '...'
- );
- $html = str_replace($badwordchars, $fixedwordchars, $html);
- // PCRE errors handling (#1486856), should we use something like for every preg_* use?
- if ($html === null && ($preg_error = preg_last_error()) != PREG_NO_ERROR) {
- $errstr = "Could not clean up HTML message! PCRE Error: $preg_error.";
- if ($preg_error == PREG_BACKTRACK_LIMIT_ERROR) {
- $errstr .= " Consider raising pcre.backtrack_limit!";
- }
- if ($preg_error == PREG_RECURSION_LIMIT_ERROR) {
- $errstr .= " Consider raising pcre.recursion_limit!";
- }
- var_dump($errstr);
- return '';
- }
- // fix (unknown/malformed) HTML tags before "wash"
- $html = preg_replace_callback('/(<(?!\!)[\/]*)([^\s>]+)([^>]*)/', array($this, 'html_tag_callback'), $html);
- // Remove invalid HTML comments (#1487759)
- // Don't remove valid conditional comments
- // Don't remove MSOutlook (<!-->) conditional comments (#1489004)
- $html = preg_replace('/<!--[^-<>\[\n]+>/', '', $html);
- // fix broken nested lists
- self::fix_broken_lists($html);
- // turn relative into absolute urls
- $html = self::resolve_base($html);
- return $html;
- }
- /**
- * Callback function for HTML tags fixing
- */
- public static function html_tag_callback($matches)
- {
- $tagname = $matches[2];
- $tagname = preg_replace(array(
- '/:.*$/', // Microsoft's Smart Tags <st1:xxxx>
- '/[^a-z0-9_\[\]\!?-]/i', // forbidden characters
- ), '', $tagname);
- // fix invalid closing tags - remove any attributes (#1489446)
- if ($matches[1] == '</') {
- $matches[3] = '';
- }
- return $matches[1] . $tagname . $matches[3];
- }
- /**
- * Convert all relative URLs according to a <base> in HTML
- */
- public static function resolve_base($body)
- {
- // check for <base href=...>
- if (preg_match('!(<base.*href=["\']?)([hftps]{3,5}://[a-z0-9/.%-]+)!i', $body, $regs)) {
- $replacer = new rcube_base_replacer($regs[2]);
- $body = $replacer->replace($body);
- }
- return $body;
- }
- /**
- * Fix broken nested lists, they are not handled properly by DOMDocument (#1488768)
- */
- public static function fix_broken_lists(&$html)
- {
- // do two rounds, one for <ol>, one for <ul>
- foreach (array('ol', 'ul') as $tag) {
- $pos = 0;
- while (($pos = stripos($html, '<' . $tag, $pos)) !== false) {
- $pos++;
- // make sure this is an ol/ul tag
- if (!in_array($html[$pos+2], array(' ', '>'))) {
- continue;
- }
- $p = $pos;
- $in_li = false;
- $li_pos = 0;
- while (($p = strpos($html, '<', $p)) !== false) {
- $tt = strtolower(substr($html, $p, 4));
- // li open tag
- if ($tt == '<li>' || $tt == '<li ') {
- $in_li = true;
- $p += 4;
- }
- // li close tag
- else if ($tt == '</li' && in_array($html[$p+4], array(' ', '>'))) {
- $li_pos = $p;
- $p += 4;
- $in_li = false;
- }
- // ul/ol closing tag
- else if ($tt == '</' . $tag && in_array($html[$p+4], array(' ', '>'))) {
- break;
- }
- // nested ol/ul element out of li
- else if (!$in_li && $li_pos && ($tt == '<ol>' || $tt == '<ol ' || $tt == '<ul>' || $tt == '<ul ')) {
- // find closing tag of this ul/ol element
- $element = substr($tt, 1, 2);
- $cpos = $p;
- do {
- $tpos = stripos($html, '<' . $element, $cpos+1);
- $cpos = stripos($html, '</' . $element, $cpos+1);
- }
- while ($tpos !== false && $cpos !== false && $cpos > $tpos);
- // not found, this is invalid HTML, skip it
- if ($cpos === false) {
- break;
- }
- // get element content
- $end = strpos($html, '>', $cpos);
- $len = $end - $p + 1;
- $element = substr($html, $p, $len);
- // move element to the end of the last li
- $html = substr_replace($html, '', $p, $len);
- $html = substr_replace($html, $element, $li_pos, 0);
- $p = $end;
- }
- else {
- $p++;
- }
- }
- }
- }
- }
- /**
- * Explode css style value
- */
- protected function explode_style($style)
- {
- $pos = 0;
- // first remove comments
- while (($pos = strpos($style, '/*', $pos)) !== false) {
- $end = strpos($style, '*/', $pos+2);
- if ($end === false) {
- $style = substr($style, 0, $pos);
- }
- else {
- $style = substr_replace($style, '', $pos, $end - $pos + 2);
- }
- }
- $style = trim($style);
- $strlen = strlen($style);
- $result = array();
- // explode value
- $q = false;
- for ($p=$i=0; $i < $strlen; $i++) {
- if (($style[$i] == "\"" || $style[$i] == "'") && $style[$i-1] != "\\") {
- if ($q == $style[$i]) {
- $q = false;
- }
- else if (!$q) {
- $q = $style[$i];
- }
- }
- if (!$q && $style[$i] == ' ' && !preg_match('/[,\(]/', $style[$i-1])) {
- $result[] = substr($style, $p, $i - $p);
- $p = $i + 1;
- }
- }
- $result[] = (string) substr($style, $p);
- return $result;
- }
- }
- class rcube_base_replacer
- {
- private $base_url;
- /**
- * Class constructor
- *
- * @param string $base Base URL
- */
- public function __construct($base)
- {
- $this->base_url = $base;
- }
- /**
- * Replace callback
- *
- * @param array $matches Matching entries
- *
- * @return string Replaced text with absolute URL
- */
- public function callback($matches)
- {
- return $matches[1] . '="' . self::absolute_url($matches[3], $this->base_url) . '"';
- }
- /**
- * Convert base URLs to absolute ones
- *
- * @param string $body Text body
- *
- * @return string Replaced text
- */
- public function replace($body)
- {
- $regexp = array(
- '/(src|background|href)=(["\']?)([^"\'\s>]+)(\2|\s|>)/i',
- '/(url\s*\()(["\']?)([^"\'\)\s]+)(\2)\)/i',
- );
- return preg_replace_callback($regexp, array($this, 'callback'), $body);
- }
- /**
- * Convert paths like ../xxx to an absolute path using a base url
- *
- * @param string $path Relative path
- * @param string $base_url Base URL
- *
- * @return string Absolute URL
- */
- public static function absolute_url($path, $base_url)
- {
- // check if path is an absolute URL
- if (preg_match('/^[fhtps]+:\/\//', $path)) {
- return $path;
- }
- // check if path is a content-id scheme
- if (strpos($path, 'cid:') === 0) {
- return $path;
- }
- $host_url = $base_url;
- $abs_path = $path;
- // cut base_url to the last directory
- if (strrpos($base_url, '/') > 7) {
- $host_url = substr($base_url, 0, strpos($base_url, '/', 7));
- $base_url = substr($base_url, 0, strrpos($base_url, '/'));
- }
- // $path is absolute
- if ($path[0] == '/') {
- $abs_path = $host_url.$path;
- }
- else {
- // strip './' because its the same as ''
- $path = preg_replace('/^\.\//', '', $path);
- if (preg_match_all('/\.\.\//', $path, $matches, PREG_SET_ORDER)) {
- $cnt = count($matches);
- while ($cnt--) {
- if ($pos = strrpos($base_url, '/')) {
- $base_url = substr($base_url, 0, $pos);
- }
- $path = substr($path, 3);
- }
- }
- $abs_path = $base_url.'/'.$path;
- }
- return $abs_path;
- }
- }
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