Ticket #3495: pingback.diff

xmlrpc.php

@@ -1176 +1176 @@
                 $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;
+
+                $preg_target = preg_quote($pagelinkedto);
+
                 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);
-                                $finished = true;
+                        if ( strpos($para, $pagelinkedto) !== false ) { // it exists, but is it a link?
+                                preg_match("|<a[^>]+?".$preg_target."[^>]*>([^>]+?)</a>|", $para, $context);
+
+                                // If the URL isn't in a link context, keep looking
+                                if ( empty($context) )
+                                        continue;
+
+                                // We're going to use this fake tag to mark the context in a bit
+                                // the marker is needed in case the link text appears more than once in the paragraph
+                                $excerpt = preg_replace('|\</?wpcontext\>|', '', $para);
+
+                                // prevent really long link text
+                                if ( strlen($context[1]) > 100 )
+                                        $context[1] = substr($context[1], 0, 100) . '...';
+
+                                $marker = '<wpcontext>'.$context[1].'</wpcontext>';    // set up our marker
+                                $excerpt= str_replace($context[0], $marker, $excerpt); // swap out the link for our marker
+                                $excerpt = strip_tags($excerpt, '<wpcontext>');        // strip all tags but our context marker
+                                $excerpt = trim($excerpt);
+                                $preg_marker = preg_quote($marker);
+                                $excerpt = preg_replace("|.*?\s(.{0,100}$preg_marker.{0,100})\s.*|s", '$1', $excerpt);
+                                $excerpt = strip_tags($excerpt); // YES, again, to remove the marker wrapper
+                                break;
                         }
                 }
 
-                if ( empty($context) ) // URL pattern not found
+                if ( empty($context) ) // Link to target 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.');
 
                 $pagelinkedfrom = preg_replace('#&([^amp\;])#is', '&amp;$1', $pagelinkedfrom);