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<?php
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// $Id$
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function trackback_page($node) {
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$output[] = '<?xml version="1.0" encoding="utf-8"?>';
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$output[] = '<response>';
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$trackback = trackback_receive($node);
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if (empty($trackback->error)) {
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db_query("INSERT INTO {trackback_received} (nid, created, site, name, subject, url, excerpt, status) VALUES (%d, %d, '%s', '%s', '%s', '%s', '%s', %d)", $trackback->nid, $trackback->created, $trackback->site, $trackback->name, $trackback->subject, $trackback->url, $trackback->excerpt, $trackback->status);
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$trackback->trid = db_last_insert_id('trackback_received', 'trid');
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trackback_invoke_trackback($trackback, 'insert');
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watchdog('trackback', 'Added trackback %subject.', array('%subject' => $trackback->subject), WATCHDOG_NOTICE, _trackback_path($trackback, t('view')));
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$output[] = '<error>0</error>';
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}
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else {
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$output[] = '<error>1</error>';
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$output[] = '<message>'. $trackback->error .'</message>';
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}
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$output[] = '</response>';
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header('Content-Type: text/xml');
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print implode("\n", $output) ."\n";
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}
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function trackback_receive($node) {
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$trackback = new stdClass();
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if (empty($_REQUEST['url']) || !_trackback_valid_url($_REQUEST['url'])) {
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$trackback->error = t('Missing TrackBack url.');
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}
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elseif (variable_get('trackback_reject_oneway', 0)) {
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$reply = drupal_http_request($_REQUEST['url']);
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if (!empty($reply->error)) {
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$trackback->error = t('Could not retrieve the sender page.');
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}
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elseif (stristr($reply->data, $GLOBALS['base_url'] .'/') === FALSE) {
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$trackback->error = t('The sender page does not refer to recipient site.');
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}
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}
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if (empty($trackback->error)) {
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$trackback->nid = $node->nid;
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$trackback->created = time();
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$trackback->site = ip_address();
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list($name, $subject, $excerpt) = _trackback_optional_params('blog_name', 'title', 'excerpt');
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$trackback->name = strip_tags($name ? $name : $_REQUEST['url']);
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$trackback->subject = $subject ? $subject : $_REQUEST['url'];
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$trackback->url = $_REQUEST['url'];
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$trackback->excerpt = strlen($excerpt) > 255 ? truncate_utf8($excerpt, 252) .'...' : $excerpt;
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$trackback->status = (variable_get('trackback_moderation', 0) == 0) ? 1 : 0;
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trackback_invoke_trackback($trackback, 'receive');
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}
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return $trackback;
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}
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function _trackback_optional_params() {
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$args = func_get_args();
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foreach ($args as $i) {
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$params[] = isset($_REQUEST[$i]) ? $_REQUEST[$i] : '';
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}
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if (preg_match('/;\s*charset=([^\s;]+)/i', $_SERVER['CONTENT_TYPE'], $match)) {
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$charset = $match[1];
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}
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else {
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$utf8 = '/^(?:[\s\x21-\x7F]|[\xC2-\xDF][\x80-\xBF]|[\xE0-\xEF][\x80-\xBF]{2}|[\xF0-\xF7][\x80-\xBF]{3}|[\xF8-\xFB][\x80-\xBF]{4}|[\xFC-\xFD][\x80-\xBF]{5})*$/';
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$sample = implode(' ', $params);
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if (!preg_match($utf8, $sample)) {
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global $locale;
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$defaults = array(
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'be' => 5, 'cs' => 2, 'el' => 7, 'hr' => 2, 'hu' => 2, 'pl' => 2,
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'ro' => 2, 'ru' => 5, 'sk' => 2, 'sl' => 2, 'tr' => 9, 'uk' => 5,
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'ja' => array('ISO-2022-JP', 'EUC-JP', 'SJIS'),
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'ko' => array('ISO-2022-KR', 'EUC-KR'),
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'zh-hans' => array('HZ', 'EUC-CN'),
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'zh-hant' => array('BIG-5', 'EUC-TW')
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);
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if ($charset = $defaults[$locale] and is_array($charset)) {
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if (function_exists('mb_detect_encoding')) {
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$charset = @mb_detect_encoding($sample, $charset);
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}
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else {
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foreach ($charset as $charset) {
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if (drupal_convert_to_utf8($sample, $charset) != '') break;
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$charset = NULL;
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}
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}
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}
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if (!$charset) {
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$charset = 'ISO-8859-1'; // or 'ISO-8859-15'
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}
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elseif (!is_string($charset)) {
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$charset = 'ISO-8859-'. $charset;
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}
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}
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}
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if ($charset && strcasecmp($charset, 'UTF-8') != 0) {
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foreach ($params as $i => $t) {
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if ($t != '') {
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$t = drupal_convert_to_utf8($t, $charset);
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if ($t != '') {
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$params[$i] = $t;
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}
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}
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}
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}
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return $params;
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}
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function _trackback_send($node) {
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$urls = array();
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if (!empty($node->trackback_urls)) {
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foreach (explode("\n", $node->trackback_urls) as $url) {
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if ($url = trim($url)) {
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$urls[$url] = TRUE;
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}
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}
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}
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if ($node->status && variable_get('trackback_auto_detection_enabled', 0) == 1) {
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$urls += trackback_urls_via_nodebody($node);
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}
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$retry = array();
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if (isset($node->trackback_urls_to_retry)) {
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$retry = array_diff($node->trackback_urls_to_retry, array(0));
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}
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_trackback_ping($node, $urls, $retry);
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}
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function trackback_urls_via_nodebody($node) {
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$trackback_urls = array();
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// First, grab anything that looks like a url from the body of the node.
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$node = node_build_content($node);
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$content = drupal_render($node->content);
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$pattern = '((?:http|https)://[a-z0-9;/?:@&=+#$,_.!~*()%-]+)';
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if (variable_get('trackback_link_only', 0)) {
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$content = strip_tags($content, '<a>'); // remove comment.
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$pattern = '<a\s+[^>]*href\s*=\s*(?:"|\')'. $pattern;
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}
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if (preg_match_all('`'. $pattern .'`i', $content, $parsed_urls)) {
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$parsed_urls = array_unique($parsed_urls[1]);
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foreach ($parsed_urls as $url) {
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// Now, send http HEAD requests so we can see if the content type is something that *might* contain autodetection text.
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// In other words, check if Content-Type of each URL is text based rather than digital.
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$url = html_entity_decode($url, ENT_QUOTES);
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if (_trackback_url_parsable_content($url)) {
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//Finally, download each page, scan each, and compile a list of all the trackback URLs listed in the first RDF of each scanned page.
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$reply = drupal_http_request($url);
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if (empty($reply->error)) {
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$url = preg_replace('/.*<rdf:RDF.*trackback:ping="([^"]+)".*<\/rdf:RDF>.*/s', '\1', $reply->data);
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if (_trackback_valid_url($url)) {
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$trackback_urls[$url] = FALSE;
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}
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}
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}
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}
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}
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return $trackback_urls;
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}
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// Since autodetection might encounter a link to a media file, we first want to make a
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// simple 'HEAD' HTTP request instead of an actual GET. This results in having to make
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// an extra drupal_http_request() later for an actual GET, but it is worth it considering
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// the strong likelihood that auto-detection may encounter a URL that links to a media file.
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function _trackback_url_parsable_content($url) {
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global $base_url;
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if (!strstr($url, $base_url)) {
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$http_reply = drupal_http_request($url, array(), 'HEAD');
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$content_type = $http_reply->headers['Content-Type'];
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return (substr_count($content_type, 'text/html') || substr_count($content_type, 'application/xhtml+xml') || substr_count($content_type, 'application/xml') || substr_count($content_type, 'text/xml'));
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}
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}
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function _trackback_ping($node, $urls, $force = array()) {
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if ($urls) {
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$result = db_query('SELECT url FROM {trackback_sent} WHERE nid=%d', $node->nid);
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while ($sent = db_fetch_object($result)) {
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unset($urls[$sent->url]);
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}
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}
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$urls += $force;
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if ($urls) {
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$node = node_build_content($node, TRUE);
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$node->teaser = drupal_render($node->content);
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$node->teaser = preg_replace(array('/<p\b/i', '/<div\b/i'), array("\n\$0", ' $0'), $node->teaser);
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$params = array(
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'title' => $node->title,
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'excerpt' => truncate_utf8(trim(strip_tags($node->teaser)), 255),
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'blog_name' => variable_get('site_name', ''),
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'url' => url('node/'. $node->nid, array('absolute' => TRUE))
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);
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$query = array();
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foreach ($params as $key => $value) {
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$query[] = $key .'='. urlencode($value);
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}
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$query = implode('&', $query);
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foreach ($urls as $url => $type) {
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$reply = drupal_http_request($url, array('Content-Type' => 'application/x-www-form-urlencoded; charset=utf-8'), 'POST', $query);
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$succ = 0;
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if (empty($reply->error) && preg_match('|<error>([0-9]+)</error>|', $reply->data, $match)) {
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$succ = $match[1] ? 0 : 1;
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}
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db_lock_table('trackback_sent');
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db_query("UPDATE {trackback_sent} SET successful=%d WHERE nid=%d AND url='%s'", $succ, $node->nid, $url);
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if (!db_affected_rows()) {
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db_query("INSERT INTO {trackback_sent} (nid, url, successful) VALUES (%d, '%s', %d)", $node->nid, $url, $succ);
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}
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db_unlock_tables();
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}
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}
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}
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