2008-08-22 09:17:14 -04:00
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<?php
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/**
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* This is the HTML pseudo-parser for the Yadis library.
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*
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* PHP versions 4 and 5
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*
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* LICENSE: See the COPYING file included in this distribution.
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*
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* @package OpenID
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* @author JanRain, Inc. <openid@janrain.com>
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* @copyright 2005-2008 Janrain, Inc.
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* @license http://www.apache.org/licenses/LICENSE-2.0 Apache
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*/
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/**
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* This class is responsible for scanning an HTML string to find META
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* tags and their attributes. This is used by the Yadis discovery
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* process. This class must be instantiated to be used.
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*
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* @package OpenID
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*/
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class Auth_Yadis_ParseHTML {
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/**
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* @access private
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*/
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var $_re_flags = "si";
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/**
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* @access private
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*/
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var $_removed_re =
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"<!--.*?-->|<!\[CDATA\[.*?\]\]>|<script\b(?!:)[^>]*>.*?<\/script>";
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/**
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* @access private
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*/
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var $_tag_expr = "<%s%s(?:\s.*?)?%s>";
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/**
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* @access private
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*/
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var $_attr_find = '\b([-\w]+)=(".*?"|\'.*?\'|.+?)[\/\s>]';
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function Auth_Yadis_ParseHTML()
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{
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$this->_attr_find = sprintf("/%s/%s",
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$this->_attr_find,
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$this->_re_flags);
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$this->_removed_re = sprintf("/%s/%s",
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$this->_removed_re,
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$this->_re_flags);
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$this->_entity_replacements = array(
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'amp' => '&',
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'lt' => '<',
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'gt' => '>',
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'quot' => '"'
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);
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$this->_ent_replace =
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sprintf("&(%s);", implode("|",
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$this->_entity_replacements));
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}
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/**
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* Strip single and double quotes off of a string, if they are
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* present.
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*
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* @access private
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* @param string $str The original string
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* @return string $new_str The new string with leading and
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* trailing quotes removed
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*/
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function removeQuotes($str)
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{
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$matches = array();
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$double = '/^"(.*)"$/';
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$single = "/^\'(.*)\'$/";
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if (preg_match($double, $str, $matches)) {
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return $matches[1];
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} else if (preg_match($single, $str, $matches)) {
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return $matches[1];
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} else {
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return $str;
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}
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}
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/**
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* Create a regular expression that will match an opening
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* or closing tag from a set of names.
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*
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* @access private
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* @param mixed $tag_names Tag names to match
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* @param mixed $close false/0 = no, true/1 = yes, other = maybe
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* @param mixed $self_close false/0 = no, true/1 = yes, other = maybe
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* @return string $regex A regular expression string to be used
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* in, say, preg_match.
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*/
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function tagPattern($tag_names, $close, $self_close)
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{
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if (is_array($tag_names)) {
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$tag_names = '(?:'.implode('|',$tag_names).')';
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}
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if ($close) {
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$close = '\/' . (($close == 1)? '' : '?');
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} else {
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$close = '';
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}
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if ($self_close) {
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$self_close = '(?:\/\s*)' . (($self_close == 1)? '' : '?');
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} else {
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$self_close = '';
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}
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$expr = sprintf($this->_tag_expr, $close, $tag_names, $self_close);
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return sprintf("/%s/%s", $expr, $this->_re_flags);
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}
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/**
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* Given an HTML document string, this finds all the META tags in
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* the document, provided they are found in the
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* <HTML><HEAD>...</HEAD> section of the document. The <HTML> tag
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* may be missing.
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*
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* @access private
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* @param string $html_string An HTMl document string
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* @return array $tag_list Array of tags; each tag is an array of
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* attribute -> value.
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*/
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function getMetaTags($html_string)
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{
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$html_string = preg_replace($this->_removed_re,
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"",
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$html_string);
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$key_tags = array($this->tagPattern('html', false, false),
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$this->tagPattern('head', false, false),
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$this->tagPattern('head', true, false),
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$this->tagPattern('html', true, false),
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$this->tagPattern(array(
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'body', 'frameset', 'frame', 'p', 'div',
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'table','span','a'), 'maybe', 'maybe'));
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$key_tags_pos = array();
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foreach ($key_tags as $pat) {
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$matches = array();
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preg_match($pat, $html_string, $matches, PREG_OFFSET_CAPTURE);
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if($matches) {
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$key_tags_pos[] = $matches[0][1];
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} else {
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$key_tags_pos[] = null;
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}
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}
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// no opening head tag
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if (is_null($key_tags_pos[1])) {
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return array();
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}
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// the effective </head> is the min of the following
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if (is_null($key_tags_pos[2])) {
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$key_tags_pos[2] = strlen($html_string);
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}
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foreach (array($key_tags_pos[3], $key_tags_pos[4]) as $pos) {
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if (!is_null($pos) && $pos < $key_tags_pos[2]) {
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$key_tags_pos[2] = $pos;
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}
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}
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// closing head tag comes before opening head tag
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if ($key_tags_pos[1] > $key_tags_pos[2]) {
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return array();
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}
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// if there is an opening html tag, make sure the opening head tag
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// comes after it
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if (!is_null($key_tags_pos[0]) && $key_tags_pos[1] < $key_tags_pos[0]) {
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return array();
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}
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$html_string = substr($html_string, $key_tags_pos[1],
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($key_tags_pos[2]-$key_tags_pos[1]));
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$link_data = array();
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$link_matches = array();
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if (!preg_match_all($this->tagPattern('meta', false, 'maybe'),
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$html_string, $link_matches)) {
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return array();
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}
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foreach ($link_matches[0] as $link) {
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$attr_matches = array();
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preg_match_all($this->_attr_find, $link, $attr_matches);
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$link_attrs = array();
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foreach ($attr_matches[0] as $index => $full_match) {
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$name = $attr_matches[1][$index];
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2015-07-05 23:07:41 +02:00
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$value = html_entity_decode(
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2008-08-22 09:17:14 -04:00
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$this->removeQuotes($attr_matches[2][$index]));
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$link_attrs[strtolower($name)] = $value;
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}
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$link_data[] = $link_attrs;
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}
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return $link_data;
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}
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/**
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* Looks for a META tag with an "http-equiv" attribute whose value
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* is one of ("x-xrds-location", "x-yadis-location"), ignoring
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* case. If such a META tag is found, its "content" attribute
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* value is returned.
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*
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* @param string $html_string An HTML document in string format
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* @return mixed $content The "content" attribute value of the
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* META tag, if found, or null if no such tag was found.
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*/
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function getHTTPEquiv($html_string)
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{
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$meta_tags = $this->getMetaTags($html_string);
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if ($meta_tags) {
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foreach ($meta_tags as $tag) {
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if (array_key_exists('http-equiv', $tag) &&
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(in_array(strtolower($tag['http-equiv']),
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array('x-xrds-location', 'x-yadis-location'))) &&
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array_key_exists('content', $tag)) {
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return $tag['content'];
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}
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}
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}
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return null;
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}
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}
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