--- NP_TrackBack.php.orig	Wed Feb 18 13:46:58 2004
+++ NP_TrackBack.php	Sat May 28 00:00:00 2005
@@ -402,6 +402,30 @@
 		if (!$blog_name)	$blog_name = $this->noblogname;
 		if (!$title)		$title = $this->notitle;
 		if (!$excerpt)		$excerpt = $this->noexcerpt;
+
+		// check for NG patterns
+		global $TRACKBACK_NG_PATTERNS;
+		if (isset($TRACKBACK_NG_PATTERNS)) {
+			$remote_addr = serverVar('REMOTE_ADDR');
+			$subject = $url . $title . $excerpt . $blog_name . $remote_addr;
+			foreach ($TRACKBACK_NG_PATTERNS as $pattern) {
+				if (preg_match($pattern, $subject)) {
+					ACTIONLOG::add(INFO, "TrackBack ping was denied from ip:$remote_addr for pattern:$pattern");
+					return 'Sorry, no trackback pings are accepted';
+				}
+			}
+		}
+
+		// check for interval
+		global $TRACKBACK_INTERVAL;
+		if (isset($TRACKBACK_INTERVAL)) {
+			$query = 'SELECT timestamp FROM ' . sql_table('plugin_tb') . " WHERE url = '" . addslashes($url) . "' AND timestamp > '" . mysqldate($b->getCorrectTime() - $TRACKBACK_INTERVAL) . "'";
+			$res = @mysql_query($query);
+			if ($res && mysql_num_rows($res)) {
+				ACTIONLOG::add(INFO, "TrackBack ping was denied from url:$url for interval:$TRACKBACK_INTERVAL seconds");
+				return 'Sorry, no trackback pings are accepted';
+			}
+		}
 		
 		// 3. save data in the DB
 		$query = 'INSERT INTO ' . sql_table('plugin_tb') . " (tb_id, url, title, excerpt, blog_name, timestamp) VALUES ('".$tb_id."','".addslashes($url)."','".addslashes($title)."','".addslashes($excerpt)."','".addslashes($blog_name)."',".mysqldate($b->getCorrectTime()).")";
@@ -433,6 +457,9 @@
 
 		}
 
+		// clear cache
+		$this->clearCache($tb_id);
+
 		return '';
 	}	
 	
@@ -441,7 +468,7 @@
 	  * Show a 'ping site' form, where a ping URL can be entered for an item
 	  */
 	function showPingForm() {
-		global $manager, $CONF, $HTTP_REFERER;
+		global $manager, $CONF;
 		
 		// get values to put in the fields
 		$ping_url = requestVar('ping_url');
@@ -475,7 +502,7 @@
 <input type="hidden" name="action" value="plugin" />
 <input type="hidden" name="name" value="TrackBack" />
 <input type="hidden" name="type" value="sendping" />
-<input type="hidden" name="redirectTo" value="<?php echo htmlspecialchars($HTTP_REFERER)?>" />
+<input type="hidden" name="redirectTo" value="<?php echo htmlspecialchars(serverVar('HTTP_REFERER'))?>" />
 <table><tr>
 	<td>URL</td>
 	<td><input type="text" value="<?php echo htmlspecialchars($url)?>" name="url" size="60" /></td>
@@ -512,7 +539,7 @@
 	  * Blogger does not support trackback)
 	  */
 	function showManualPingForm() {
-		global $manager, $CONF, $HTTP_REFERER;
+		global $manager, $CONF;
 		
 		// check if we are allowed to accept pings
 		if ($this->getOption('AcceptPing') == 'no')
@@ -542,7 +569,7 @@
 <input type="hidden" name="action" value="plugin" />
 <input type="hidden" name="name" value="TrackBack" />
 <input type="hidden" name="type" value="manualping" />
-<input type="hidden" name="redirectTo" value="<?php echo htmlspecialchars($HTTP_REFERER)?>" />
+<input type="hidden" name="redirectTo" value="<?php echo htmlspecialchars(serverVar('HTTP_REFERER'))?>" />
 <table><tr>
 	<td>Article URL</td>
 	<td><input type="text" value="" name="url" size="60" /></td>
@@ -712,8 +739,11 @@
 			
 		$query = 'DELETE FROM ' . sql_table('plugin_tb') . " WHERE tb_id='$tb_id' and url='".addslashes($url)."'";
 		mysql_query($query);
-		global $HTTP_REFERER;
-		header('Location: ' . $HTTP_REFERER);
+
+		// clear cache
+		$this->clearCache($tb_id);
+
+		header('Location: ' . serverVar('HTTP_REFERER'));
 	}
 	
 	/**
@@ -923,6 +953,9 @@
 		$res = @mysql_query($query);
 		if (!$res) 
 			return 'Could not save trackback data, possibly because of a double entry: ' . mysql_error();
+
+		// clear cache
+		$this->clearCache($tb_id);
 	}
 	
 	/**
@@ -979,8 +1012,11 @@
 			
 		$query = 'DELETE FROM ' . sql_table('plugin_tb_lc') . " WHERE tb_id='$tb_id' and from_id='$from_id'";
 		mysql_query($query);
-		global $HTTP_REFERER;
-		header('Location: ' . $HTTP_REFERER);
+
+		// clear cache
+		$this->clearCache($tb_id);
+
+		header('Location: ' . serverVar('HTTP_REFERER'));
 	}
 	
 	function jencording($text,$charset=_CHARSET){
@@ -1053,5 +1089,16 @@
 		return $res; 
 	}
 
+	function clearCache($itemid) {
+		global $manager;
+
+		// call event_PreUpdateItem of NP_Cache if exists
+		if ($manager->pluginInstalled('NP_Cache')) {
+			$plugin = $manager->getPlugin('NP_Cache');
+			if ($plugin && method_exists($plugin, 'event_PreUpdateItem')) {
+				call_user_func(array(&$plugin, 'event_PreUpdateItem'), array('itemid' => $itemid));
+			}
+		}
+	}
 }
 ?>
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