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- <?php
- namespace p3k\XRay\Formats;
-
- use HTMLPurifier, HTMLPurifier_Config;
- use DOMDocument, DOMXPath;
- use p3k\XRay\Formats;
-
- class HTML extends Format {
-
- public static function matches_host($url) { return true; }
- public static function matches($url) { return true; }
-
- public static function parse($http, $html, $url, $opts=[]) {
- $result = [
- 'data' => [
- 'type' => 'unknown',
- ],
- 'url' => $url,
- ];
-
- // attempt to parse the page as HTML
- $doc = new DOMDocument();
- @$doc->loadHTML(self::toHtmlEntities($html));
-
- if(!$doc) {
- return [
- 'error' => 'invalid_content',
- 'error_description' => 'The document could not be parsed as HTML'
- ];
- }
-
- $xpath = new DOMXPath($doc);
-
- // Check for meta http equiv and replace the status code if present
- foreach($xpath->query('//meta[translate(@http-equiv,\'STATUS\',\'status\')=\'status\']') as $el) {
- $equivStatus = ''.$el->getAttribute('content');
- if($equivStatus && is_string($equivStatus)) {
- if(preg_match('/^(\d+)/', $equivStatus, $match)) {
- $result['code'] = (int)$match[1];
- }
- }
- }
-
- // If a target parameter was provided, make sure a link to it exists on the page
- if(isset($opts['target'])) {
- $target = $opts['target'];
-
- $found = [];
- if($target) {
- self::xPathFindNodeWithAttribute($xpath, 'a', 'href', function($u) use($target, &$found){
- if($u == $target) {
- $found[$u] = null;
- }
- });
- self::xPathFindNodeWithAttribute($xpath, 'img', 'src', function($u) use($target, &$found){
- if($u == $target) {
- $found[$u] = null;
- }
- });
- self::xPathFindNodeWithAttribute($xpath, 'video', 'src', function($u) use($target, &$found){
- if($u == $target) {
- $found[$u] = null;
- }
- });
- self::xPathFindNodeWithAttribute($xpath, 'audio', 'src', function($u) use($target, &$found){
- if($u == $target) {
- $found[$u] = null;
- }
- });
- }
-
- if(!$found) {
- return [
- 'error' => 'no_link_found',
- 'error_description' => 'The source document does not have a link to the target URL',
- 'code' => isset($result['code']) ? $result['code'] : 200,
- 'url' => $url
- ];
- }
- }
-
- // If the URL has a fragment ID, find the DOM starting at that node and parse it instead
- $fragment = parse_url($url, PHP_URL_FRAGMENT);
- if($fragment) {
- $fragElement = self::xPathGetElementById($xpath, $fragment);
- if($fragElement) {
- $html = $doc->saveHTML($fragElement);
- $foundFragment = true;
- } else {
- $foundFragment = false;
- }
- }
-
- // Now start pulling in the data from the page. Start by looking for microformats2
- $mf2 = \mf2\Parse($html, $url);
-
- if($mf2 && count($mf2['items']) > 0) {
- $data = Formats\Mf2::parse($mf2, $url, $http, $opts);
- if($data) {
- $result = array_merge($result, $data);
- if($fragment) {
- $result['info'] = [
- 'found_fragment' => $foundFragment
- ];
- }
- $result['original'] = $html;
- $result['url'] = $url; // this will be the effective URL after following redirects
- }
- }
- return $result;
- }
-
- private static function toHtmlEntities($input) {
- return mb_convert_encoding($input, 'HTML-ENTITIES', mb_detect_encoding($input));
- }
-
- private static function xPathFindNodeWithAttribute($xpath, $node, $attr, $callback) {
- foreach($xpath->query('//'.$node.'[@'.$attr.']') as $el) {
- $v = $el->getAttribute($attr);
- $callback($v);
- }
- }
-
- private static function xPathGetElementById($xpath, $id) {
- $element = null;
- foreach($xpath->query("//*[@id='$id']") as $el) {
- $element = $el;
- }
- return $element;
- }
-
- }
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