Wordpress 2.3.2
[autoinstalls/wordpress.git] / wp-includes / comment.php
1 <?php
2
3 function check_comment($author, $email, $url, $comment, $user_ip, $user_agent, $comment_type) {
4         global $wpdb;
5
6         if ( 1 == get_option('comment_moderation') )
7                 return false; // If moderation is set to manual
8
9         if ( preg_match_all("|(href\t*?=\t*?['\"]?)?(https?:)?//|i", $comment, $out) >= get_option('comment_max_links') )
10                 return false; // Check # of external links
11
12         $mod_keys = trim(get_option('moderation_keys'));
13         if ( !empty($mod_keys) ) {
14                 $words = explode("\n", $mod_keys );
15
16                 foreach ($words as $word) {
17                         $word = trim($word);
18
19                         // Skip empty lines
20                         if ( empty($word) )
21                                 continue;
22
23                         // Do some escaping magic so that '#' chars in the
24                         // spam words don't break things:
25                         $word = preg_quote($word, '#');
26
27                         $pattern = "#$word#i";
28                         if ( preg_match($pattern, $author) ) return false;
29                         if ( preg_match($pattern, $email) ) return false;
30                         if ( preg_match($pattern, $url) ) return false;
31                         if ( preg_match($pattern, $comment) ) return false;
32                         if ( preg_match($pattern, $user_ip) ) return false;
33                         if ( preg_match($pattern, $user_agent) ) return false;
34                 }
35         }
36
37         // Comment whitelisting:
38         if ( 1 == get_option('comment_whitelist')) {
39                 if ( 'trackback' == $comment_type || 'pingback' == $comment_type ) { // check if domain is in blogroll
40                         $uri = parse_url($url);
41                         $domain = $uri['host'];
42                         $uri = parse_url( get_option('home') );
43                         $home_domain = $uri['host'];
44                         if ( $wpdb->get_var("SELECT link_id FROM $wpdb->links WHERE link_url LIKE ('%$domain%') LIMIT 1") || $domain == $home_domain )
45                                 return true;
46                         else
47                                 return false;
48                 } elseif ( $author != '' && $email != '' ) {
49                         $ok_to_comment = $wpdb->get_var("SELECT comment_approved FROM $wpdb->comments WHERE comment_author = '$author' AND comment_author_email = '$email' and comment_approved = '1' LIMIT 1");
50                         if ( ( 1 == $ok_to_comment ) &&
51                                 ( empty($mod_keys) || false === strpos( $email, $mod_keys) ) )
52                                         return true;
53                         else
54                                 return false;
55                 } else {
56                         return false;
57                 }
58         }
59         return true;
60 }
61
62
63 function get_approved_comments($post_id) {
64         global $wpdb;
65
66         $post_id = (int) $post_id;
67         return $wpdb->get_results("SELECT * FROM $wpdb->comments WHERE comment_post_ID = '$post_id' AND comment_approved = '1' ORDER BY comment_date");
68 }
69
70
71 // Retrieves comment data given a comment ID or comment object.
72 // Handles comment caching.
73 function &get_comment(&$comment, $output = OBJECT) {
74         global $wpdb;
75
76         if ( empty($comment) ) {
77                 if ( isset($GLOBALS['comment']) )
78                         $_comment = & $GLOBALS['comment'];
79                 else
80                         $_comment = null;
81         } elseif ( is_object($comment) ) {
82                 wp_cache_add($comment->comment_ID, $comment, 'comment');
83                 $_comment = $comment;
84         } else {
85                 $comment = (int) $comment;
86                 if ( isset($GLOBALS['comment']) && ($GLOBALS['comment']->comment_ID == $comment) ) {
87                         $_comment = & $GLOBALS['comment'];
88                 } elseif ( ! $_comment = wp_cache_get($comment, 'comment') ) {
89                         $_comment = $wpdb->get_row("SELECT * FROM $wpdb->comments WHERE comment_ID = '$comment' LIMIT 1");
90                         wp_cache_add($_comment->comment_ID, $_comment, 'comment');
91                 }
92         }
93
94         $_comment = apply_filters('get_comment', $_comment);
95
96         if ( $output == OBJECT ) {
97                 return $_comment;
98         } elseif ( $output == ARRAY_A ) {
99                 return get_object_vars($_comment);
100         } elseif ( $output == ARRAY_N ) {
101                 return array_values(get_object_vars($_comment));
102         } else {
103                 return $_comment;
104         }
105 }
106
107
108 // Deprecate in favor of get_comment()?
109 function get_commentdata( $comment_ID, $no_cache = 0, $include_unapproved = false ) { // less flexible, but saves DB queries
110         global $postc, $id, $commentdata, $wpdb;
111         if ( $no_cache ) {
112                 $query = "SELECT * FROM $wpdb->comments WHERE comment_ID = '$comment_ID'";
113                 if ( false == $include_unapproved )
114                         $query .= " AND comment_approved = '1'";
115                 $myrow = $wpdb->get_row($query, ARRAY_A);
116         } else {
117                 $myrow['comment_ID']           = $postc->comment_ID;
118                 $myrow['comment_post_ID']      = $postc->comment_post_ID;
119                 $myrow['comment_author']       = $postc->comment_author;
120                 $myrow['comment_author_email'] = $postc->comment_author_email;
121                 $myrow['comment_author_url']   = $postc->comment_author_url;
122                 $myrow['comment_author_IP']    = $postc->comment_author_IP;
123                 $myrow['comment_date']         = $postc->comment_date;
124                 $myrow['comment_content']      = $postc->comment_content;
125                 $myrow['comment_karma']        = $postc->comment_karma;
126                 $myrow['comment_approved']     = $postc->comment_approved;
127                 $myrow['comment_type']         = $postc->comment_type;
128         }
129         return $myrow;
130 }
131
132
133 function get_lastcommentmodified($timezone = 'server') {
134         global $cache_lastcommentmodified, $pagenow, $wpdb;
135         $add_seconds_blog = get_option('gmt_offset') * 3600;
136         $add_seconds_server = date('Z');
137         $now = current_time('mysql', 1);
138         if ( !isset($cache_lastcommentmodified[$timezone]) ) {
139                 switch ( strtolower($timezone)) {
140                         case 'gmt':
141                                 $lastcommentmodified = $wpdb->get_var("SELECT comment_date_gmt FROM $wpdb->comments WHERE comment_date_gmt <= '$now' AND comment_approved = '1' ORDER BY comment_date_gmt DESC LIMIT 1");
142                                 break;
143                         case 'blog':
144                                 $lastcommentmodified = $wpdb->get_var("SELECT comment_date FROM $wpdb->comments WHERE comment_date_gmt <= '$now' AND comment_approved = '1' ORDER BY comment_date_gmt DESC LIMIT 1");
145                                 break;
146                         case 'server':
147                                 $lastcommentmodified = $wpdb->get_var("SELECT DATE_ADD(comment_date_gmt, INTERVAL '$add_seconds_server' SECOND) FROM $wpdb->comments WHERE comment_date_gmt <= '$now' AND comment_approved = '1' ORDER BY comment_date_gmt DESC LIMIT 1");
148                                 break;
149                 }
150                 $cache_lastcommentmodified[$timezone] = $lastcommentmodified;
151         } else {
152                 $lastcommentmodified = $cache_lastcommentmodified[$timezone];
153         }
154         return $lastcommentmodified;
155 }
156
157
158 function sanitize_comment_cookies() {
159         if ( isset($_COOKIE['comment_author_'.COOKIEHASH]) ) {
160                 $comment_author = apply_filters('pre_comment_author_name', $_COOKIE['comment_author_'.COOKIEHASH]);
161                 $comment_author = stripslashes($comment_author);
162                 $comment_author = attribute_escape($comment_author);
163                 $_COOKIE['comment_author_'.COOKIEHASH] = $comment_author;
164         }
165
166         if ( isset($_COOKIE['comment_author_email_'.COOKIEHASH]) ) {
167                 $comment_author_email = apply_filters('pre_comment_author_email', $_COOKIE['comment_author_email_'.COOKIEHASH]);
168                 $comment_author_email = stripslashes($comment_author_email);
169                 $comment_author_email = attribute_escape($comment_author_email);
170                 $_COOKIE['comment_author_email_'.COOKIEHASH] = $comment_author_email;
171         }
172
173         if ( isset($_COOKIE['comment_author_url_'.COOKIEHASH]) ) {
174                 $comment_author_url = apply_filters('pre_comment_author_url', $_COOKIE['comment_author_url_'.COOKIEHASH]);
175                 $comment_author_url = stripslashes($comment_author_url);
176                 $_COOKIE['comment_author_url_'.COOKIEHASH] = $comment_author_url;
177         }
178 }
179
180
181 function wp_allow_comment($commentdata) {
182         global $wpdb;
183         extract($commentdata, EXTR_SKIP);
184
185         // Simple duplicate check
186         $dupe = "SELECT comment_ID FROM $wpdb->comments WHERE comment_post_ID = '$comment_post_ID' AND ( comment_author = '$comment_author' ";
187         if ( $comment_author_email )
188                 $dupe .= "OR comment_author_email = '$comment_author_email' ";
189         $dupe .= ") AND comment_content = '$comment_content' LIMIT 1";
190         if ( $wpdb->get_var($dupe) )
191                 wp_die( __('Duplicate comment detected; it looks as though you\'ve already said that!') );
192
193         do_action( 'check_comment_flood', $comment_author_IP, $comment_author_email, $comment_date_gmt );
194
195         if ( $user_id ) {
196                 $userdata = get_userdata($user_id);
197                 $user = new WP_User($user_id);
198                 $post_author = $wpdb->get_var("SELECT post_author FROM $wpdb->posts WHERE ID = '$comment_post_ID' LIMIT 1");
199         }
200
201         if ( $userdata && ( $user_id == $post_author || $user->has_cap('level_9') ) ) {
202                 // The author and the admins get respect.
203                 $approved = 1;
204          } else {
205                 // Everyone else's comments will be checked.
206                 if ( check_comment($comment_author, $comment_author_email, $comment_author_url, $comment_content, $comment_author_IP, $comment_agent, $comment_type) )
207                         $approved = 1;
208                 else
209                         $approved = 0;
210                 if ( wp_blacklist_check($comment_author, $comment_author_email, $comment_author_url, $comment_content, $comment_author_IP, $comment_agent) )
211                         $approved = 'spam';
212         }
213
214         $approved = apply_filters('pre_comment_approved', $approved);
215         return $approved;
216 }
217
218 function check_comment_flood_db( $ip, $email, $date ) {
219         global $wpdb;
220         if ( $lasttime = $wpdb->get_var("SELECT comment_date_gmt FROM $wpdb->comments WHERE comment_author_IP = '$ip' OR comment_author_email = '$email' ORDER BY comment_date DESC LIMIT 1") ) {
221                 $time_lastcomment = mysql2date('U', $lasttime);
222                 $time_newcomment  = mysql2date('U', $date);
223                 $flood_die = apply_filters('comment_flood_filter', false, $time_lastcomment, $time_newcomment);
224                 if ( $flood_die ) {
225                         do_action('comment_flood_trigger', $time_lastcomment, $time_newcomment);
226                         wp_die( __('You are posting comments too quickly.  Slow down.') );
227                 }
228         }
229 }
230
231 function wp_blacklist_check($author, $email, $url, $comment, $user_ip, $user_agent) {
232         global $wpdb;
233
234         do_action('wp_blacklist_check', $author, $email, $url, $comment, $user_ip, $user_agent);
235
236         if ( preg_match_all('/&#(\d+);/', $comment . $author . $url, $chars) ) {
237                 foreach ( (array) $chars[1] as $char ) {
238                         // If it's an encoded char in the normal ASCII set, reject
239                         if ( 38 == $char )
240                                 continue; // Unless it's &
241                         if ( $char < 128 )
242                                 return true;
243                 }
244         }
245
246         $mod_keys = trim( get_option('blacklist_keys') );
247         if ( '' == $mod_keys )
248                 return false; // If moderation keys are empty
249         $words = explode("\n", $mod_keys );
250
251         foreach ( (array) $words as $word ) {
252                 $word = trim($word);
253
254                 // Skip empty lines
255                 if ( empty($word) ) { continue; }
256
257                 // Do some escaping magic so that '#' chars in the
258                 // spam words don't break things:
259                 $word = preg_quote($word, '#');
260
261                 $pattern = "#$word#i";
262                 if (
263                            preg_match($pattern, $author)
264                         || preg_match($pattern, $email)
265                         || preg_match($pattern, $url)
266                         || preg_match($pattern, $comment)
267                         || preg_match($pattern, $user_ip)
268                         || preg_match($pattern, $user_agent)
269                  )
270                         return true;
271         }
272         return false;
273 }
274
275
276 function wp_delete_comment($comment_id) {
277         global $wpdb;
278         do_action('delete_comment', $comment_id);
279
280         $comment = get_comment($comment_id);
281
282         if ( ! $wpdb->query("DELETE FROM $wpdb->comments WHERE comment_ID='$comment_id' LIMIT 1") )
283                 return false;
284
285         $post_id = $comment->comment_post_ID;
286         if ( $post_id && $comment->comment_approved == 1 )
287                 wp_update_comment_count($post_id);
288
289         clean_comment_cache($comment_id);
290
291         do_action('wp_set_comment_status', $comment_id, 'delete');
292         return true;
293 }
294
295
296 function wp_get_comment_status($comment_id) {
297         global $wpdb;
298
299         $comment = get_comment($comment_id);
300         if ( !$comment )
301                 return false;
302
303         $approved = $comment->comment_approved;
304
305         if ( $approved == NULL )
306                 return 'deleted';
307         elseif ( $approved == '1' )
308                 return 'approved';
309         elseif ( $approved == '0' )
310                 return 'unapproved';
311         elseif ( $approved == 'spam' )
312                 return 'spam';
313         else
314                 return false;
315 }
316
317
318 function wp_get_current_commenter() {
319         // Cookies should already be sanitized.
320
321         $comment_author = '';
322         if ( isset($_COOKIE['comment_author_'.COOKIEHASH]) )
323                 $comment_author = $_COOKIE['comment_author_'.COOKIEHASH];
324
325         $comment_author_email = '';
326         if ( isset($_COOKIE['comment_author_email_'.COOKIEHASH]) )
327                 $comment_author_email = $_COOKIE['comment_author_email_'.COOKIEHASH];
328
329         $comment_author_url = '';
330         if ( isset($_COOKIE['comment_author_url_'.COOKIEHASH]) )
331                 $comment_author_url = $_COOKIE['comment_author_url_'.COOKIEHASH];
332
333         return compact('comment_author', 'comment_author_email', 'comment_author_url');
334 }
335
336
337 function wp_insert_comment($commentdata) {
338         global $wpdb;
339         extract($commentdata, EXTR_SKIP);
340
341         if ( ! isset($comment_author_IP) )
342                 $comment_author_IP = preg_replace( '/[^0-9., ]/', '',$_SERVER['REMOTE_ADDR'] );
343         if ( ! isset($comment_date) )
344                 $comment_date = current_time('mysql');
345         if ( ! isset($comment_date_gmt) )
346                 $comment_date_gmt = get_gmt_from_date($comment_date);
347         if ( ! isset($comment_parent) )
348                 $comment_parent = 0;
349         if ( ! isset($comment_approved) )
350                 $comment_approved = 1;
351         if ( ! isset($user_id) )
352                 $user_id = 0;
353
354         $result = $wpdb->query("INSERT INTO $wpdb->comments
355         (comment_post_ID, comment_author, comment_author_email, comment_author_url, comment_author_IP, comment_date, comment_date_gmt, comment_content, comment_approved, comment_agent, comment_type, comment_parent, user_id)
356         VALUES
357         ('$comment_post_ID', '$comment_author', '$comment_author_email', '$comment_author_url', '$comment_author_IP', '$comment_date', '$comment_date_gmt', '$comment_content', '$comment_approved', '$comment_agent', '$comment_type', '$comment_parent', '$user_id')
358         ");
359
360         $id = (int) $wpdb->insert_id;
361
362         if ( $comment_approved == 1)
363                 wp_update_comment_count($comment_post_ID);
364
365         return $id;
366 }
367
368
369 function wp_filter_comment($commentdata) {
370         $commentdata['user_id']              = apply_filters('pre_user_id', $commentdata['user_ID']);
371         $commentdata['comment_agent']        = apply_filters('pre_comment_user_agent', $commentdata['comment_agent']);
372         $commentdata['comment_author']       = apply_filters('pre_comment_author_name', $commentdata['comment_author']);
373         $commentdata['comment_content']      = apply_filters('pre_comment_content', $commentdata['comment_content']);
374         $commentdata['comment_author_IP']    = apply_filters('pre_comment_user_ip', $commentdata['comment_author_IP']);
375         $commentdata['comment_author_url']   = apply_filters('pre_comment_author_url', $commentdata['comment_author_url']);
376         $commentdata['comment_author_email'] = apply_filters('pre_comment_author_email', $commentdata['comment_author_email']);
377         $commentdata['filtered'] = true;
378         return $commentdata;
379 }
380
381
382 function wp_throttle_comment_flood($block, $time_lastcomment, $time_newcomment) {
383         if ( $block ) // a plugin has already blocked... we'll let that decision stand
384                 return $block;
385         if ( ($time_newcomment - $time_lastcomment) < 15 )
386                 return true;
387         return false;
388 }
389
390
391 function wp_new_comment( $commentdata ) {
392         $commentdata = apply_filters('preprocess_comment', $commentdata);
393
394         $commentdata['comment_post_ID'] = (int) $commentdata['comment_post_ID'];
395         $commentdata['user_ID']         = (int) $commentdata['user_ID'];
396
397         $commentdata['comment_author_IP'] = preg_replace( '/[^0-9., ]/', '',$_SERVER['REMOTE_ADDR'] );
398         $commentdata['comment_agent']     = $_SERVER['HTTP_USER_AGENT'];
399
400         $commentdata['comment_date']     = current_time('mysql');
401         $commentdata['comment_date_gmt'] = current_time('mysql', 1);
402
403         $commentdata = wp_filter_comment($commentdata);
404
405         $commentdata['comment_approved'] = wp_allow_comment($commentdata);
406
407         $comment_ID = wp_insert_comment($commentdata);
408
409         do_action('comment_post', $comment_ID, $commentdata['comment_approved']);
410
411         if ( 'spam' !== $commentdata['comment_approved'] ) { // If it's spam save it silently for later crunching
412                 if ( '0' == $commentdata['comment_approved'] )
413                         wp_notify_moderator($comment_ID);
414
415                 $post = &get_post($commentdata['comment_post_ID']); // Don't notify if it's your own comment
416
417                 if ( get_option('comments_notify') && $commentdata['comment_approved'] && $post->post_author != $commentdata['user_ID'] )
418                         wp_notify_postauthor($comment_ID, $commentdata['comment_type']);
419         }
420
421         return $comment_ID;
422 }
423
424
425 function wp_set_comment_status($comment_id, $comment_status) {
426         global $wpdb;
427
428         switch ( $comment_status ) {
429                 case 'hold':
430                         $query = "UPDATE $wpdb->comments SET comment_approved='0' WHERE comment_ID='$comment_id' LIMIT 1";
431                         break;
432                 case 'approve':
433                         $query = "UPDATE $wpdb->comments SET comment_approved='1' WHERE comment_ID='$comment_id' LIMIT 1";
434                         break;
435                 case 'spam':
436                         $query = "UPDATE $wpdb->comments SET comment_approved='spam' WHERE comment_ID='$comment_id' LIMIT 1";
437                         break;
438                 case 'delete':
439                         return wp_delete_comment($comment_id);
440                         break;
441                 default:
442                         return false;
443         }
444
445         if ( !$wpdb->query($query) )
446                 return false;
447
448         clean_comment_cache($comment_id);
449
450         do_action('wp_set_comment_status', $comment_id, $comment_status);
451         $comment = get_comment($comment_id);
452         wp_update_comment_count($comment->comment_post_ID);
453
454         return true;
455 }
456
457
458 function wp_update_comment($commentarr) {
459         global $wpdb;
460
461         // First, get all of the original fields
462         $comment = get_comment($commentarr['comment_ID'], ARRAY_A);
463
464         // Escape data pulled from DB.
465         foreach ( (array) $comment as $key => $value )
466                 $comment[$key] = $wpdb->escape($value);
467
468         // Merge old and new fields with new fields overwriting old ones.
469         $commentarr = array_merge($comment, $commentarr);
470
471         $commentarr = wp_filter_comment( $commentarr );
472
473         // Now extract the merged array.
474         extract($commentarr, EXTR_SKIP);
475
476         $comment_content = apply_filters('comment_save_pre', $comment_content);
477
478         $comment_date_gmt = get_gmt_from_date($comment_date);
479
480         $result = $wpdb->query(
481                 "UPDATE $wpdb->comments SET
482                         comment_content      = '$comment_content',
483                         comment_author       = '$comment_author',
484                         comment_author_email = '$comment_author_email',
485                         comment_approved     = '$comment_approved',
486                         comment_author_url   = '$comment_author_url',
487                         comment_date         = '$comment_date',
488                         comment_date_gmt     = '$comment_date_gmt'
489                 WHERE comment_ID = $comment_ID" );
490
491         $rval = $wpdb->rows_affected;
492
493         clean_comment_cache($comment_ID);
494         wp_update_comment_count($comment_post_ID);
495         do_action('edit_comment', $comment_ID);
496         return $rval;
497 }
498
499
500 function wp_update_comment_count($post_id) {
501         global $wpdb, $comment_count_cache;
502         $post_id = (int) $post_id;
503         if ( !$post_id )
504                 return false;
505         if ( !$post = get_post($post_id) )
506                 return false;
507
508         $old = (int) $post->comment_count;
509         $new = (int) $wpdb->get_var("SELECT COUNT(*) FROM $wpdb->comments WHERE comment_post_ID = '$post_id' AND comment_approved = '1'");
510         $wpdb->query("UPDATE $wpdb->posts SET comment_count = '$new' WHERE ID = '$post_id'");
511         $comment_count_cache[$post_id] = $new;
512
513         if ( 'page' == $post->post_type )
514                 clean_page_cache( $post_id );
515         else
516                 clean_post_cache( $post_id );
517
518         do_action('wp_update_comment_count', $post_id, $new, $old);
519         do_action('edit_post', $post_id, $post);
520
521         return true;
522 }
523
524
525 //
526 // Ping and trackback functions.
527 //
528
529 function discover_pingback_server_uri($url, $timeout_bytes = 2048) {
530         global $wp_version;
531
532         $byte_count = 0;
533         $contents = '';
534         $headers = '';
535         $pingback_str_dquote = 'rel="pingback"';
536         $pingback_str_squote = 'rel=\'pingback\'';
537         $x_pingback_str = 'x-pingback: ';
538         $pingback_href_original_pos = 27;
539
540         extract(parse_url($url), EXTR_SKIP);
541
542         if ( !isset($host) ) // Not an URL. This should never happen.
543                 return false;
544
545         $path  = ( !isset($path) ) ? '/'          : $path;
546         $path .= ( isset($query) ) ? '?' . $query : '';
547         $port  = ( isset($port)  ) ? $port        : 80;
548
549         // Try to connect to the server at $host
550         $fp = @fsockopen($host, $port, $errno, $errstr, 2);
551         if ( !$fp ) // Couldn't open a connection to $host
552                 return false;
553
554         // Send the GET request
555         $request = "GET $path HTTP/1.1\r\nHost: $host\r\nUser-Agent: WordPress/$wp_version \r\n\r\n";
556         // ob_end_flush();
557         fputs($fp, $request);
558
559         // Let's check for an X-Pingback header first
560         while ( !feof($fp) ) {
561                 $line = fgets($fp, 512);
562                 if ( trim($line) == '' )
563                         break;
564                 $headers .= trim($line)."\n";
565                 $x_pingback_header_offset = strpos(strtolower($headers), $x_pingback_str);
566                 if ( $x_pingback_header_offset ) {
567                         // We got it!
568                         preg_match('#x-pingback: (.+)#is', $headers, $matches);
569                         $pingback_server_url = trim($matches[1]);
570                         return $pingback_server_url;
571                 }
572                 if ( strpos(strtolower($headers), 'content-type: ') ) {
573                         preg_match('#content-type: (.+)#is', $headers, $matches);
574                         $content_type = trim($matches[1]);
575                 }
576         }
577
578         if ( preg_match('#(image|audio|video|model)/#is', $content_type) ) // Not an (x)html, sgml, or xml page, no use going further
579                 return false;
580
581         while ( !feof($fp) ) {
582                 $line = fgets($fp, 1024);
583                 $contents .= trim($line);
584                 $pingback_link_offset_dquote = strpos($contents, $pingback_str_dquote);
585                 $pingback_link_offset_squote = strpos($contents, $pingback_str_squote);
586                 if ( $pingback_link_offset_dquote || $pingback_link_offset_squote ) {
587                         $quote = ($pingback_link_offset_dquote) ? '"' : '\'';
588                         $pingback_link_offset = ($quote=='"') ? $pingback_link_offset_dquote : $pingback_link_offset_squote;
589                         $pingback_href_pos = @strpos($contents, 'href=', $pingback_link_offset);
590                         $pingback_href_start = $pingback_href_pos+6;
591                         $pingback_href_end = @strpos($contents, $quote, $pingback_href_start);
592                         $pingback_server_url_len = $pingback_href_end - $pingback_href_start;
593                         $pingback_server_url = substr($contents, $pingback_href_start, $pingback_server_url_len);
594                         // We may find rel="pingback" but an incomplete pingback URL
595                         if ( $pingback_server_url_len > 0 ) // We got it!
596                                 return $pingback_server_url;
597                 }
598                 $byte_count += strlen($line);
599                 if ( $byte_count > $timeout_bytes ) {
600                         // It's no use going further, there probably isn't any pingback
601                         // server to find in this file. (Prevents loading large files.)
602                         return false;
603                 }
604         }
605
606         // We didn't find anything.
607         return false;
608 }
609
610
611 function do_all_pings() {
612         global $wpdb;
613
614         // Do pingbacks
615         while ($ping = $wpdb->get_row("SELECT * FROM {$wpdb->posts}, {$wpdb->postmeta} WHERE {$wpdb->posts}.ID = {$wpdb->postmeta}.post_id AND {$wpdb->postmeta}.meta_key = '_pingme' LIMIT 1")) {
616                 $wpdb->query("DELETE FROM {$wpdb->postmeta} WHERE post_id = {$ping->ID} AND meta_key = '_pingme';");
617                 pingback($ping->post_content, $ping->ID);
618         }
619
620         // Do Enclosures
621         while ($enclosure = $wpdb->get_row("SELECT * FROM {$wpdb->posts}, {$wpdb->postmeta} WHERE {$wpdb->posts}.ID = {$wpdb->postmeta}.post_id AND {$wpdb->postmeta}.meta_key = '_encloseme' LIMIT 1")) {
622                 $wpdb->query("DELETE FROM {$wpdb->postmeta} WHERE post_id = {$enclosure->ID} AND meta_key = '_encloseme';");
623                 do_enclose($enclosure->post_content, $enclosure->ID);
624         }
625
626         // Do Trackbacks
627         $trackbacks = $wpdb->get_results("SELECT ID FROM $wpdb->posts WHERE CHAR_LENGTH(TRIM(to_ping)) > 7 AND post_status = 'publish'");
628         if ( is_array($trackbacks) ) {
629                 foreach ( $trackbacks as $trackback )
630                         do_trackbacks($trackback->ID);
631         }
632
633         //Do Update Services/Generic Pings
634         generic_ping();
635 }
636
637 function do_trackbacks($post_id) {
638         global $wpdb;
639
640         $post = $wpdb->get_row("SELECT * FROM $wpdb->posts WHERE ID = $post_id");
641         $to_ping = get_to_ping($post_id);
642         $pinged  = get_pung($post_id);
643         if ( empty($to_ping) ) {
644                 $wpdb->query("UPDATE $wpdb->posts SET to_ping = '' WHERE ID = '$post_id'");
645                 return;
646         }
647
648         if ( empty($post->post_excerpt) )
649                 $excerpt = apply_filters('the_content', $post->post_content);
650         else
651                 $excerpt = apply_filters('the_excerpt', $post->post_excerpt);
652         $excerpt = str_replace(']]>', ']]&gt;', $excerpt);
653         $excerpt = strip_tags($excerpt);
654         if ( function_exists('mb_strcut') ) // For international trackbacks
655         $excerpt = mb_strcut($excerpt, 0, 252, get_option('blog_charset')) . '...';
656         else
657                 $excerpt = substr($excerpt, 0, 252) . '...';
658
659         $post_title = apply_filters('the_title', $post->post_title);
660         $post_title = strip_tags($post_title);
661
662         if ( $to_ping ) {
663                 foreach ( (array) $to_ping as $tb_ping ) {
664                         $tb_ping = trim($tb_ping);
665                         if ( !in_array($tb_ping, $pinged) ) {
666                                 trackback($tb_ping, $post_title, $excerpt, $post_id);
667                                 $pinged[] = $tb_ping;
668                         } else {
669                                 $wpdb->query("UPDATE $wpdb->posts SET to_ping = TRIM(REPLACE(to_ping, '$tb_ping', '')) WHERE ID = '$post_id'");
670                         }
671                 }
672         }
673 }
674
675
676 function generic_ping($post_id = 0) {
677         $services = get_option('ping_sites');
678         $services = preg_replace("|(\s)+|", '$1', $services); // Kill dupe lines
679         $services = trim($services);
680         if ( '' != $services ) {
681                 $services = explode("\n", $services);
682                 foreach ( (array) $services as $service )
683                         weblog_ping($service);
684         }
685
686         return $post_id;
687 }
688
689
690 function pingback($content, $post_ID) {
691         global $wp_version, $wpdb;
692         include_once(ABSPATH . WPINC . '/class-IXR.php');
693
694         // original code by Mort (http://mort.mine.nu:8080)
695         $post_links = array();
696
697         $pung = get_pung($post_ID);
698
699         // Variables
700         $ltrs = '\w';
701         $gunk = '/#~:.?+=&%@!\-';
702         $punc = '.:?\-';
703         $any = $ltrs . $gunk . $punc;
704
705         // Step 1
706         // Parsing the post, external links (if any) are stored in the $post_links array
707         // This regexp comes straight from phpfreaks.com
708         // http://www.phpfreaks.com/quickcode/Extract_All_URLs_on_a_Page/15.php
709         preg_match_all("{\b http : [$any] +? (?= [$punc] * [^$any] | $)}x", $content, $post_links_temp);
710
711         // Step 2.
712         // Walking thru the links array
713         // first we get rid of links pointing to sites, not to specific files
714         // Example:
715         // http://dummy-weblog.org
716         // http://dummy-weblog.org/
717         // http://dummy-weblog.org/post.php
718         // We don't wanna ping first and second types, even if they have a valid <link/>
719
720         foreach ( $post_links_temp[0] as $link_test ) :
721                 if ( !in_array($link_test, $pung) && (url_to_postid($link_test) != $post_ID) // If we haven't pung it already and it isn't a link to itself
722                                 && !is_local_attachment($link_test) ) : // Also, let's never ping local attachments.
723                         $test = parse_url($link_test);
724                         if ( isset($test['query']) )
725                                 $post_links[] = $link_test;
726                         elseif ( ($test['path'] != '/') && ($test['path'] != '') )
727                                 $post_links[] = $link_test;
728                 endif;
729         endforeach;
730
731         do_action_ref_array('pre_ping', array(&$post_links, &$pung));
732
733         foreach ( (array) $post_links as $pagelinkedto ) {
734                 $pingback_server_url = discover_pingback_server_uri($pagelinkedto, 2048);
735
736                 if ( $pingback_server_url ) {
737                         @ set_time_limit( 60 );
738                          // Now, the RPC call
739                         $pagelinkedfrom = get_permalink($post_ID);
740
741                         // using a timeout of 3 seconds should be enough to cover slow servers
742                         $client = new IXR_Client($pingback_server_url);
743                         $client->timeout = 3;
744                         $client->useragent .= ' -- WordPress/' . $wp_version;
745
746                         // when set to true, this outputs debug messages by itself
747                         $client->debug = false;
748
749                         if ( $client->query('pingback.ping', $pagelinkedfrom, $pagelinkedto) || ( isset($client->error->code) && 48 == $client->error->code ) ) // Already registered
750                                 add_ping( $post_ID, $pagelinkedto );
751                 }
752         }
753 }
754
755
756 function privacy_ping_filter($sites) {
757         if ( '0' != get_option('blog_public') )
758                 return $sites;
759         else
760                 return '';
761 }
762
763 // Send a Trackback
764 function trackback($trackback_url, $title, $excerpt, $ID) {
765         global $wpdb, $wp_version;
766
767         if ( empty($trackback_url) )
768                 return;
769
770         $title = urlencode($title);
771         $excerpt = urlencode($excerpt);
772         $blog_name = urlencode(get_option('blogname'));
773         $tb_url = $trackback_url;
774         $url = urlencode(get_permalink($ID));
775         $query_string = "title=$title&url=$url&blog_name=$blog_name&excerpt=$excerpt";
776         $trackback_url = parse_url($trackback_url);
777         $http_request = 'POST ' . $trackback_url['path'] . ($trackback_url['query'] ? '?'.$trackback_url['query'] : '') . " HTTP/1.0\r\n";
778         $http_request .= 'Host: '.$trackback_url['host']."\r\n";
779         $http_request .= 'Content-Type: application/x-www-form-urlencoded; charset='.get_option('blog_charset')."\r\n";
780         $http_request .= 'Content-Length: '.strlen($query_string)."\r\n";
781         $http_request .= "User-Agent: WordPress/" . $wp_version;
782         $http_request .= "\r\n\r\n";
783         $http_request .= $query_string;
784         if ( '' == $trackback_url['port'] )
785                 $trackback_url['port'] = 80;
786         $fs = @fsockopen($trackback_url['host'], $trackback_url['port'], $errno, $errstr, 4);
787         @fputs($fs, $http_request);
788         @fclose($fs);
789
790         $tb_url = addslashes( $tb_url );
791         $wpdb->query("UPDATE $wpdb->posts SET pinged = CONCAT(pinged, '\n', '$tb_url') WHERE ID = '$ID'");
792         return $wpdb->query("UPDATE $wpdb->posts SET to_ping = TRIM(REPLACE(to_ping, '$tb_url', '')) WHERE ID = '$ID'");
793 }
794
795
796 function weblog_ping($server = '', $path = '') {
797         global $wp_version;
798         include_once(ABSPATH . WPINC . '/class-IXR.php');
799
800         // using a timeout of 3 seconds should be enough to cover slow servers
801         $client = new IXR_Client($server, ((!strlen(trim($path)) || ('/' == $path)) ? false : $path));
802         $client->timeout = 3;
803         $client->useragent .= ' -- WordPress/'.$wp_version;
804
805         // when set to true, this outputs debug messages by itself
806         $client->debug = false;
807         $home = trailingslashit( get_option('home') );
808         if ( !$client->query('weblogUpdates.extendedPing', get_option('blogname'), $home, get_bloginfo('rss2_url') ) ) // then try a normal ping
809                 $client->query('weblogUpdates.ping', get_option('blogname'), $home);
810 }
811
812 //
813 // Cache
814 //
815
816 function clean_comment_cache($id) {
817         wp_cache_delete($id, 'comment');
818 }
819
820 function update_comment_cache($comments) {
821         foreach ( $comments as $comment )
822                 wp_cache_add($comment->comment_ID, $comment, 'comment');
823 }
824
825 ?>