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Better pingback extraction, fixes #1268 

git-svn-id: https://develop.svn.wordpress.org/trunk@2619 602fd350-edb4-49c9-b593-d223f7449a82
This commit is contained in:
Matt Mullenweg 2005-06-04 10:15:36 +00:00
parent 9cb97522f2
commit 472b800ab4
2 changed files with 42 additions and 71 deletions
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16
wp-includes/functions-formatting.php
View File

@ -591,20 +591,6 @@ function is_email($user_email) {
}
}
function strip_all_but_one_link($text, $mylink) {
$match_link = '#(<a.+?href.+?'.'>)(.+?)(</a>)#';
preg_match_all($match_link, $text, $matches);
$count = count($matches[0]);
for ($i=0; $i<$count; $i++) {
if (!strstr($matches[0][$i], $mylink)) {
$text = str_replace($matches[0][$i], $matches[2][$i], $text);
}
}
return $text;
}
// used by wp-mail to handle charsets in email subjects
function wp_iso_descrambler($string) {
/* this may only work with iso-8859-1, I'm afraid */
@ -990,4 +976,4 @@ function ent2ncr($text) {
return $text;
}
?>
?>

97
xmlrpc.php
View File

@ -1075,8 +1075,6 @@ class wp_xmlrpc_server extends IXR_Server {
/* pingback.ping gets a pingback and registers it */
function pingback_ping($args) {
// original code by Mort (http://mort.mine.nu:8080 -- site seems dead)
// refactored to return error codes and avoid deep ifififif headaches
global $wpdb, $wp_version;
$pagelinkedfrom = $args[0];
@ -1091,10 +1089,8 @@ class wp_xmlrpc_server extends IXR_Server {
// Check if the page linked to is in our site
$pos1 = strpos($pagelinkedto, str_replace('http://', '', str_replace('www.', '', get_settings('home'))));
if(!$pos1) {
return new IXR_Error(0, '');
}
if( !$pos1 )
return new IXR_Error(0, 'Is there no link to us?');
// let's find which post is linked to
// FIXME: does url_to_postid() cover all these cases already?
@ -1124,7 +1120,7 @@ class wp_xmlrpc_server extends IXR_Server {
$way = 'from the fragment (post-###)';
} elseif (is_string($urltest['fragment'])) {
// ...or a string #title, a little more complicated
$title = preg_replace('/[^a-zA-Z0-9]/', '.', $urltest['fragment']);
$title = preg_replace('/[^a-z0-9]/i', '.', $urltest['fragment']);
$sql = "SELECT ID FROM $wpdb->posts WHERE post_title RLIKE '$title'";
if (! ($post_ID = $wpdb->get_var($sql)) ) {
// returning unknown error '0' is better than die()ing
@ -1136,27 +1132,25 @@ class wp_xmlrpc_server extends IXR_Server {
// TODO: Attempt to extract a post ID from the given URL
return new IXR_Error(33, 'The specified target URI cannot be used as a target. It either doesn\'t exist, or it is not a pingback-enabled resource.');
}
$post_ID = (int) $post_ID;
logIO("O","(PB) URI='$pagelinkedto' ID='$post_ID' Found='$way'");
$sql = 'SELECT post_author FROM '.$wpdb->posts.' WHERE ID = '.$post_ID;
$result = $wpdb->get_results($sql);
$post = $wpdb->get_row("SELECT post_author FROM $wpdb->posts WHERE ID = '$post_ID'");
if (!$wpdb->num_rows) {
// Post_ID not found
if ( !$post ) // Post_ID not found
return new IXR_Error(33, 'The specified target URI cannot be used as a target. It either doesn\'t exist, or it is not a pingback-enabled resource.');
}
// Check if pings are on
if ( 'closed' == $post->ping_status )
return new IXR_Error(33, 'The specified target URI cannot be used as a target. It either doesn\'t exist, or it is not a pingback-enabled resource.');
// Let's check that the remote site didn't already pingback this entry
$result = $wpdb->get_results("SELECT * FROM $wpdb->comments WHERE comment_post_ID = '$post_ID' AND comment_author_url = '$pagelinkedfrom'");
if ($wpdb->num_rows) {
// We already have a Pingback from this URL
if ( $wpdb->num_rows ) // We already have a Pingback from this URL
return new IXR_Error(48, 'The pingback has already been registered.');
}
// very stupid, but gives time to the 'from' server to publish !
sleep(1);
@ -1167,46 +1161,42 @@ class wp_xmlrpc_server extends IXR_Server {
return new IXR_Error(16, 'The source URI does not exist.');
// Work around bug in strip_tags():
$linea = str_replace('<!DOCTYPE','<DOCTYPE',$linea);
$linea = strip_tags($linea, '<title><a>');
$linea = strip_all_but_one_link($linea, $pagelinkedto);
// I don't think we need this? -- emc3
//$linea = preg_replace('#&([^amp\;])#is', '&amp;$1', $linea);
if ( empty($matchtitle) ) {
preg_match('|<title>([^<]*?)</title>|is', $linea, $matchtitle);
}
$pos2 = strpos($linea, $pagelinkedto);
$pos3 = strpos($linea, str_replace('http://www.', 'http://', $pagelinkedto));
if (is_integer($pos2) || is_integer($pos3)) {
// The page really links to us :)
$pos4 = (is_integer($pos2)) ? $pos2 : $pos3;
$start = $pos4-100;
$context = substr($linea, $start, 250);
$context = str_replace("\n", ' ', $context);
$context = str_replace('&amp;', '&', $context);
}
$linea = str_replace('<!DOC', '<DOC', $linea);
$linea = preg_replace( '/[\s\r\n\t]+/', ' ', $linea ); // normalize spaces
$linea = preg_replace( "/ <(h1|h2|h3|h4|h5|h6|p|th|td|li|dt|dd|pre|caption|input|textarea|button|body)[^>]*>/", "\n\n", $linea );
if (empty($context)) {
// URL pattern not found
return new IXR_Error(17, 'The source URI does not contain a link to the target URI, and so cannot be used as a source.');
preg_match('|<title>([^<]*?)</title>|is', $linea, $matchtitle);
$title = $matchtitle[1];
if ( empty( $title ) )
return new IXR_Error(32, 'We cannot find a title on that page.');
$linea = strip_tags( $linea, '<a>' ); // just keep the tag we need
$p = explode( "\n\n", $linea );
$sem_regexp_pb = "/(\\/|\\\|\*|\?|\+|\.|\^|\\$|\(|\)|\[|\]|\||\{|\})/";
$sem_regexp_fix = "\\\\$1";
$link = preg_replace( $sem_regexp_pb, $sem_regexp_fix, $pagelinkedfrom );
$finished = false;
foreach ( $p as $para ) {
if ( $finished )
continue;
if ( strstr( $para, $pagelinkedto ) ) {
$context = preg_replace( "/.*<a[^>]+".$link."[^>]*>([^>]+)<\/a>.*/", "$1", $para );
$excerpt = strip_tags( $para );
$excerpt = trim( $excerpt );
$use = preg_quote( $context );
$excerpt = preg_replace("|.*?\s(.{0,100}$use.{0,100})\s|s", "$1", $excerpt);
$finished = true;
}
}
// Check if pings are on
$pingstatus = $wpdb->get_var("SELECT ping_status FROM $wpdb->posts WHERE ID = $post_ID");
if ('closed' == $pingstatus) {
return new IXR_Error(33, 'The specified target URI cannot be used as a target. It either doesn\'t exist, or it is not a pingback-enabled resource.');
}
$pagelinkedfrom = preg_replace('#&([^amp\;])#is', '&amp;$1', $pagelinkedfrom);
$title = (!strlen($matchtitle[1])) ? $pagelinkedfrom : $matchtitle[1];
$original_context = strip_tags($context);
$context = '[...] ';
$context .= wp_specialchars($original_context);
$context .= ' [...]';
$context = '[...] ' . wp_specialchars( $excerpt ) . ' [...]';
$original_pagelinkedfrom = $pagelinkedfrom;
$pagelinkedfrom = addslashes($pagelinkedfrom);
$pagelinkedfrom = addslashes( $pagelinkedfrom );
$original_title = $title;
$comment_post_ID = $post_ID;
@ -1215,11 +1205,6 @@ class wp_xmlrpc_server extends IXR_Server {
$comment_content = $context;
$comment_type = 'pingback';
$pingstatus = $wpdb->get_var("SELECT ping_status FROM $wpdb->posts WHERE ID = $post_ID");
if ('open' != $pingstatus)
die('Sorry, pingbacks are closed for this item.');
$commentdata = compact('comment_post_ID', 'comment_author', 'comment_author_url', 'comment_content', 'comment_type');
wp_new_comment($commentdata);