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Add some codes from 3.61. Currently files under /nucleus/libs and /nucleus/libs/sql...
[nucleus-jp/nucleus-jp-ancient.git] / utf8 / nucleus / libs / MANAGER.php
index ad14c49..4e67cda 100755 (executable)
@@ -1,7 +1,7 @@
 <?php
 /*
  * Nucleus: PHP/MySQL Weblog CMS (http://nucleuscms.org/)
- * Copyright (C) 2002-2006 The Nucleus Group
+ * Copyright (C) 2002-2010 The Nucleus Group
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
  * active at all times. The object can be requested using MANAGER::instance()
  *
  * @license http://nucleuscms.org/license.txt GNU General Public License
- * @copyright Copyright (C) 2002-2006 The Nucleus Group
- * @version $Id: MANAGER.php,v 1.6 2006-07-20 08:01:52 kimitake Exp $
- * $NucleusJP: MANAGER.php,v 1.5 2006/07/17 20:03:44 kimitake Exp $
+ * @copyright Copyright (C) 2002-2010 The Nucleus Group
+ * @version $Id$
+ * $NucleusJP: MANAGER.php,v 1.8.2.1 2007/09/05 07:00:18 kimitake Exp $
  */
 class MANAGER {
 
-       /**
-        * Cached ITEM, BLOG, PLUGIN, KARMA and MEMBER objects. When these objects are requested
-        * through the global $manager object (getItem, getBlog, ...), only the first call
-        * will create an object. Subsequent calls will return the same object.
-        *
-        * The $items, $blogs, ... arrays map an id to an object (for plugins, the name is used
-        * rather than an ID)
-        */
-       var $items;
-       var $blogs;
-       var $plugins;
-       var $karma;
-       var $templates;
-       var $members;
-
-       /**
-        * cachedInfo to avoid repeated SQL queries (see pidInstalled/pluginInstalled/getPidFromName)
-        * e.g. which plugins exists?
-        *
-        * $cachedInfo['installedPlugins'] = array($pid -> $name)
-        */
-       var $cachedInfo;
-
-       /**
-         * The plugin subscriptionlist
-         *
-         * The subcription array has the following structure
-         *             $subscriptions[$EventName] = array containing names of plugin classes to be
-         *                                                                      notified when that event happens
-         */
-       var $subscriptions;
-
-       /**
-         * Returns the only instance of this class. Creates the instance if it
-         * does not yet exists. Users should use this function as
-         * $manager =& MANAGER::instance(); to get a reference to the object
-         * instead of a copy
-         */
-       function &instance() {
-               static $instance = array();
-               if (empty($instance)) {
-                       $instance[0] =& new MANAGER();
-               }
-               return $instance[0];
-       }
-
-       /**
-         * The constructor of this class initializes the object caches
-         */
-       function MANAGER() {
-               $this->items = array();
-               $this->blogs = array();
-               $this->plugins = array();
-               $this->karma = array();
-               $this->parserPrefs = array();
-               $this->cachedInfo = array();
-       }
-
-       /**
-         * Returns the requested item object. If it is not in the cache, it will
-         * first be loaded and then placed in the cache.
-         * Intended use: $item =& $manager->getItem(1234)
-         */
-       function &getItem($itemid, $allowdraft, $allowfuture) {
-               $item =& $this->items[$itemid];
-
-               // check the draft and future rules if the item was already cached
-               if ($item) {
-                       if ((!$allowdraft) && ($item['draft']))
-                               return 0;
-
-                       $blog =& $this->getBlog(getBlogIDFromItemID($itemid));
-                       if ((!$allowfuture) && ($item['timestamp'] > $blog->getCorrectTime()))
-                               return 0;
-               }
-               if (!$item) {
-                       // load class if needed
-                       $this->loadClass('ITEM');
-                       // load item object
-                       $item = ITEM::getitem($itemid, $allowdraft, $allowfuture);
-                       $this->items[$itemid] = $item;
-               }
-               return $item;
-       }
-
-       /**
-         * Loads a class if it has not yet been loaded
-         */
-       function loadClass($name) {
-               $this->_loadClass($name, $name . '.php');
-       }
-
-       /**
-         * Checks if an item exists
-         */
-       function existsItem($id,$future,$draft) {
-               $this->_loadClass('ITEM','ITEM.php');
-               return ITEM::exists($id,$future,$draft);
-       }
-
-       /**
-         * Checks if a category exists
-         */
-       function existsCategory($id) {
-               return (quickQuery('SELECT COUNT(*) as result FROM '.sql_table('category').' WHERE catid='.intval($id)) > 0);
-       }
-
-       function &getBlog($blogid) {
-               $blog =& $this->blogs[$blogid];
-
-               if (!$blog) {
-                       // load class if needed
-                       $this->_loadClass('BLOG','BLOG.php');
-                       // load blog object
-                       $blog =& new BLOG($blogid);
-                       $this->blogs[$blogid] =& $blog;
-               }
-               return $blog;
-       }
-
-       function existsBlog($name) {
-               $this->_loadClass('BLOG','BLOG.php');
-               return BLOG::exists($name);
-       }
-
-       function existsBlogID($id) {
-               $this->_loadClass('BLOG','BLOG.php');
-               return BLOG::existsID($id);
-       }
-
-       /**
-        * Returns a previously read template
-        */
-       function &getTemplate($templateName) {
-               $template =& $this->templates[$templateName];
-
-               if (!$template) {
-                       $template = TEMPLATE::read($templateName);
-                       $this->templates[$templateName] =& $template;
-               }
-               return $template;
-       }
-
-       /**
-        * Returns a KARMA object (karma votes)
-        */
-       function &getKarma($itemid) {
-               $karma =& $this->karma[$itemid];
-
-               if (!$karma) {
-                       // load class if needed
-                       $this->_loadClass('KARMA','KARMA.php');
-                       // create KARMA object
-                       $karma =& new KARMA($itemid);
-                       $this->karma[$itemid] =& $karma;
-               }
-               return $karma;
-       }
-
-       /**
-        * Returns a MEMBER object
-        */
-       function &getMember($memberid) {
-               $mem =& $this->members[$memberid];
-
-               if (!$mem) {
-                       // load class if needed
-                       $this->_loadClass('MEMBER','MEMBER.php');
-                       // create MEMBER object
-                       $mem =& MEMBER::createFromID($memberid);
-                       $this->members[$memberid] =& $mem;
-               }
-               return $mem;
-       }
-
-       /**
-        * Global parser preferences
-        */
-       function setParserProperty($name, $value) {
-               $this->parserPrefs[$name] = $value;
-       }
-       function getParserProperty($name) {
-               return $this->parserPrefs[$name];
-       }
-
-       /**
-         * A private helper class to load classes
-         */
-       function _loadClass($name, $filename) {
-               if (!class_exists($name)) {
-                               global $DIR_LIBS;
-                               include($DIR_LIBS . $filename);
-               }
-       }
-
-       function _loadPlugin($name) {
-               if (!class_exists($name)) {
-                               global $DIR_PLUGINS;
-
-                               $fileName = $DIR_PLUGINS . $name . '.php';
-
-                               if (!file_exists($fileName))
-                               {
-                                       ACTIONLOG::add(WARNING, 'Plugin ' . $name . ' was not loaded (File not found)');
-                                       return 0;
-                               }
-
-                               // load plugin
-                               include($fileName);
-
-                               // check if class exists (avoid errors in eval'd code)
-                               if (!class_exists($name))
-                               {
-                                       ACTIONLOG::add(WARNING, 'Plugin ' . $name . ' was not loaded (Class not found in file, possible parse error)');
-                                       return 0;
-                               }
-
-                               // add to plugin array
-                               eval('$this->plugins[$name] =& new ' . $name . '();');
-
-                               // get plugid
-                               $this->plugins[$name]->plugid = $this->getPidFromName($name);
-
-                               // unload plugin if a prefix is used and the plugin cannot handle this^
-                               global $MYSQL_PREFIX;
-                               if (($MYSQL_PREFIX != '') && !$this->plugins[$name]->supportsFeature('SqlTablePrefix'))
-                               {
-                                       unset($this->plugins[$name]);
-                                       ACTIONLOG::add(WARNING, 'Plugin ' . $name . ' was not loaded (does not support SqlTablePrefix)');
-                                       return 0;
-                               }
-
-                               // call init method
-                               $this->plugins[$name]->init();
-
-               }
-       }
-
-       function &getPlugin($name) {
-               $plugin =& $this->plugins[$name];
-
-               if (!$plugin) {
-                       // load class if needed
-                       $this->_loadPlugin($name);
-                       $plugin =& $this->plugins[$name];
-               }
-               return $plugin;
-       }
-
-       /**
-         * checks if the given plugin IS installed or not
-         */
-       function pluginInstalled($name) {
-               $this->_initCacheInfo('installedPlugins');
-               return ($this->getPidFromName($name) != -1);
-       }
-       function pidInstalled($pid) {
-               $this->_initCacheInfo('installedPlugins');
-               return ($this->cachedInfo['installedPlugins'][$pid] != '');
-       }
-       function getPidFromName($name) {
-               $this->_initCacheInfo('installedPlugins');
-               foreach ($this->cachedInfo['installedPlugins'] as $pid => $pfile)
-               {
-                       if ($pfile == $name)
-                               return $pid;
-               }
-               return -1;
-       }
-       function clearCachedInfo($what) {
-               unset($this->cachedInfo[$what]);
-       }
-
-       /**
-        * Loads some info on the first call only
-        */
-       function _initCacheInfo($what)
-       {
-               if (isset($this->cachedInfo[$what]) && is_array($this->cachedInfo[$what]))
-                       return;
-               switch ($what)
-               {
-                       // 'installedPlugins' = array ($pid => $name)
-                       case 'installedPlugins':
-                               $this->cachedInfo['installedPlugins'] = array();
-                               $res = sql_query('SELECT pid, pfile FROM ' . sql_table('plugin'));
-                               while ($o = mysql_fetch_object($res))
-                               {
-                                       $this->cachedInfo['installedPlugins'][$o->pid] = $o->pfile;
-                               }
-                               break;
-               }
-       }
-
-       /**
-         * A function to notify plugins that something has happened. Only the plugins
-         * that are subscribed to the event will get notified.
-         * Upon the first call, the list of subscriptions will be fetched from the
-         * database. The plugins itsself will only get loaded when they are first needed
-         *
-         * @param $eventName
-         *             Name of the event (method to be called on plugins)
-         * @param $data
-         *             Can contain any type of data, depending on the event type. Usually this is
-         *             an itemid, blogid, ... but it can also be an array containing multiple values
-         */
-       function notify($eventName, $data) {
-               // load subscription list if needed
-               if (!is_array($this->subscriptions))
-                       $this->_loadSubscriptions();
-
-
-               // get listening objects
-               $listeners = false;
-               if (isset($this->subscriptions[$eventName])) {
-                       $listeners = $this->subscriptions[$eventName];
-               }
-
-               // notify all of them
-               if (is_array($listeners)) {
-                       foreach($listeners as $listener) {
-                               // load class if needed
-                               $this->_loadPlugin($listener);
-                               // do notify (if method exists)
-                               if (method_exists($this->plugins[$listener], 'event_' . $eventName))
-                                       call_user_func(array(&$this->plugins[$listener],'event_' . $eventName), $data);
-                       }
-               }
-
-       }
-
-       /**
-         * Loads plugin subscriptions
-         */
-       function _loadSubscriptions() {
-               // initialize as array
-               $this->subscriptions = array();
-
-               $res = sql_query('SELECT p.pfile as pfile, e.event as event FROM '.sql_table('plugin_event').' as e, '.sql_table('plugin').' as p WHERE e.pid=p.pid ORDER BY p.porder ASC');
-               while ($o = mysql_fetch_object($res)) {
-                       $pluginName = $o->pfile;
-                       $eventName = $o->event;
-                       $this->subscriptions[$eventName][] = $pluginName;
-               }
-
-       }
-
-       /*
-               Ticket functions. These are uses by the admin area to make it impossible to simulate certain GET/POST
-               requests. tickets are user specific
-       */
-
-       var $currentRequestTicket = '';
-
-       /**
-        * GET requests: Adds ticket to URL (URL should NOT be html-encoded!, ticket is added at the end)
-        */
-       function addTicketToUrl($url)
-       {
-               $ticketCode = 'ticket=' . $this->_generateTicket();
-               if (strstr($url, '?'))
-                       return $url . '&' . $ticketCode;
-               else
-                       return $url . '?' . $ticketCode;
-       }
-
-       /**
-        * POST requests: Adds ticket as hidden formvar
-        */
-       function addTicketHidden()
-       {
-               $ticket = $this->_generateTicket();
-
-               echo '<input type="hidden" name="ticket" value="', htmlspecialchars($ticket), '" />';
-       }
-
-       /**
-        * Get a new ticket
-        * (xmlHTTPRequest AutoSaveDraft uses this to refresh the ticket)
-        */
-       function getNewTicket()
-       {
-               $this->currentRequestTicket = '';
-               return $this->_generateTicket();
-       }
-
-       /**
-        * Checks the ticket that was passed along with the current request
-        */
-       function checkTicket()
-       {
-               global $member;
-
-               // get ticket from request
-               $ticket = requestVar('ticket');
-
-               // no ticket -> don't allow
-               if ($ticket == '')
-                       return false;
-
-               // remove expired tickets first
-               $this->_cleanUpExpiredTickets();
-
-               // get member id
-               if (!$member->isLoggedIn())
-                       $memberId = -1;
-               else
-                       $memberId = $member->getID();
-
-               // check if ticket is a valid one
-               $query = 'SELECT COUNT(*) as result FROM ' . sql_table('tickets') . ' WHERE member=' . intval($memberId). ' and ticket=\''.addslashes($ticket).'\'';
-               if (quickQuery($query) == 1)
-               {
-                       // [in the original implementation, the checked ticket was deleted. This would lead to invalid
-                       //  tickets when using the browsers back button and clicking another link/form
-                       //  leaving the keys in the database is not a real problem, since they're member-specific and
-                       //  only valid for a period of one hour
-                       // ]
-                       // sql_query('DELETE FROM '.sql_table('tickets').' WHERE member=' . intval($memberId). ' and ticket=\''.addslashes($ticket).'\'');
-                       return true;
-               } else {
-                       // not a valid ticket
-                       return false;
-               }
-
-       }
-
-       /**
-        * (internal method) Removes the expired tickets
-        */
-       function _cleanUpExpiredTickets()
-       {
-               // remove tickets older than 1 hour
-               $oldTime = time() - 60 * 60;
-               $query = 'DELETE FROM ' . sql_table('tickets'). ' WHERE ctime < \'' . date('Y-m-d H:i:s',$oldTime) .'\'';
-               sql_query($query);
-       }
-
-       /**
-        * (internal method) Generates/returns a ticket (one ticket per page request)
-        */
-       function _generateTicket()
-       {
-               if ($this->currentRequestTicket == '')
-               {
-                       // generate new ticket (only one ticket will be generated per page request)
-                       // and store in database
-                       global $member;
-                       // get member id
-                       if (!$member->isLoggedIn())
-                               $memberId = -1;
-                       else
-                               $memberId = $member->getID();
-
-                       $ok = false;
-                       while (!$ok)
-                       {
-                               // generate a random token
-                               srand((double)microtime()*1000000);
-                               $ticket = md5(uniqid(rand(), true));
-
-                               // add in database as non-active
-                               $query = 'INSERT INTO ' . sql_table('tickets') . ' (ticket, member, ctime) ';
-                               $query .= 'VALUES (\'' . addslashes($ticket). '\', \'' . intval($memberId). '\', \'' . date('Y-m-d H:i:s',time()) . '\')';
-                               if (sql_query($query))
-                                       $ok = true;
-                       }
-
-                       $this->currentRequestTicket = $ticket;
-               }
-               return $this->currentRequestTicket;
-       }
+    /**
+     * Cached ITEM, BLOG, PLUGIN, KARMA and MEMBER objects. When these objects are requested
+     * through the global $manager object (getItem, getBlog, ...), only the first call
+     * will create an object. Subsequent calls will return the same object.
+     *
+     * The $items, $blogs, ... arrays map an id to an object (for plugins, the name is used
+     * rather than an ID)
+     */
+    var $items;
+    var $blogs;
+    var $plugins;
+    var $karma;
+    var $templates;
+    var $members;
+
+    /**
+     * cachedInfo to avoid repeated SQL queries (see pidInstalled/pluginInstalled/getPidFromName)
+     * e.g. which plugins exists?
+     *
+     * $cachedInfo['installedPlugins'] = array($pid -> $name)
+     */
+    var $cachedInfo;
+
+    /**
+      * The plugin subscriptionlist
+      *
+      * The subcription array has the following structure
+      *     $subscriptions[$EventName] = array containing names of plugin classes to be
+      *                                  notified when that event happens
+      */
+    var $subscriptions;
+
+    /**
+      * Returns the only instance of this class. Creates the instance if it
+      * does not yet exists. Users should use this function as
+      * $manager =& MANAGER::instance(); to get a reference to the object
+      * instead of a copy
+      */
+    function &instance() {
+        static $instance = array();
+        if (empty($instance)) {
+            $instance[0] =& new MANAGER();
+        }
+        return $instance[0];
+    }
+
+    /**
+      * The constructor of this class initializes the object caches
+      */
+    function MANAGER() {
+        $this->items = array();
+        $this->blogs = array();
+        $this->plugins = array();
+        $this->karma = array();
+        $this->parserPrefs = array();
+        $this->cachedInfo = array();
+    }
+
+    /**
+      * Returns the requested item object. If it is not in the cache, it will
+      * first be loaded and then placed in the cache.
+      * Intended use: $item =& $manager->getItem(1234)
+      */
+    function &getItem($itemid, $allowdraft, $allowfuture) {
+        $item =& $this->items[$itemid];
+
+        // check the draft and future rules if the item was already cached
+        if ($item) {
+            if ((!$allowdraft) && ($item['draft']))
+                return 0;
+
+            $blog =& $this->getBlog(getBlogIDFromItemID($itemid));
+            if ((!$allowfuture) && ($item['timestamp'] > $blog->getCorrectTime()))
+                return 0;
+        }
+        if (!$item) {
+            // load class if needed
+            $this->loadClass('ITEM');
+            // load item object
+            $item = ITEM::getitem($itemid, $allowdraft, $allowfuture);
+            $this->items[$itemid] = $item;
+        }
+        return $item;
+    }
+
+    /**
+      * Loads a class if it has not yet been loaded
+      */
+    function loadClass($name) {
+        $this->_loadClass($name, $name . '.php');
+    }
+
+    /**
+      * Checks if an item exists
+      */
+    function existsItem($id,$future,$draft) {
+        $this->_loadClass('ITEM','ITEM.php');
+        return ITEM::exists($id,$future,$draft);
+    }
+
+    /**
+      * Checks if a category exists
+      */
+    function existsCategory($id) {
+        return (quickQuery('SELECT COUNT(*) as result FROM '.sql_table('category').' WHERE catid='.intval($id)) > 0);
+    }
+
+    /**
+      * Returns the blog object for a given blogid
+      */
+    function &getBlog($blogid) {
+        $blog =& $this->blogs[$blogid];
+
+        if (!$blog) {
+            // load class if needed
+            $this->_loadClass('BLOG','BLOG.php');
+            // load blog object
+            $blog =& new BLOG($blogid);
+            $this->blogs[$blogid] =& $blog;
+        }
+        return $blog;
+    }
+
+    /**
+      * Checks if a blog exists
+      */
+    function existsBlog($name) {
+        $this->_loadClass('BLOG','BLOG.php');
+        return BLOG::exists($name);
+    }
+
+    /**
+      * Checks if a blog id exists
+      */
+    function existsBlogID($id) {
+        $this->_loadClass('BLOG','BLOG.php');
+        return BLOG::existsID($id);
+    }
+
+    /**
+     * Returns a previously read template
+     */
+    function &getTemplate($templateName) {
+        $template =& $this->templates[$templateName];
+
+        if (!$template) {
+            $template = TEMPLATE::read($templateName);
+            $this->templates[$templateName] =& $template;
+        }
+        return $template;
+    }
+
+    /**
+     * Returns a KARMA object (karma votes)
+     */
+    function &getKarma($itemid) {
+        $karma =& $this->karma[$itemid];
+
+        if (!$karma) {
+            // load class if needed
+            $this->_loadClass('KARMA','KARMA.php');
+            // create KARMA object
+            $karma =& new KARMA($itemid);
+            $this->karma[$itemid] =& $karma;
+        }
+        return $karma;
+    }
+
+    /**
+     * Returns a MEMBER object
+     */
+    function &getMember($memberid) {
+        $mem =& $this->members[$memberid];
+
+        if (!$mem) {
+            // load class if needed
+            $this->_loadClass('MEMBER','MEMBER.php');
+            // create MEMBER object
+            $mem =& MEMBER::createFromID($memberid);
+            $this->members[$memberid] =& $mem;
+        }
+        return $mem;
+    }
+
+    /**
+     * Set the global parser preferences
+     */
+    function setParserProperty($name, $value) {
+        $this->parserPrefs[$name] = $value;
+    }
+
+    /**
+     * Get the global parser preferences
+     */
+    function getParserProperty($name) {
+        return $this->parserPrefs[$name];
+    }
+
+    /**
+      * A helper function to load a class
+      * 
+      * private
+      */
+    function _loadClass($name, $filename) {
+        if (!class_exists($name)) {
+                global $DIR_LIBS;
+                include($DIR_LIBS . $filename);
+        }
+    }
+
+    /**
+      * A helper function to load a plugin
+      * 
+      * private
+      */
+    function _loadPlugin($name) {
+        if (!class_exists($name)) {
+                global $DIR_PLUGINS;
+
+                $fileName = $DIR_PLUGINS . $name . '.php';
+
+                if (!file_exists($fileName))
+                {
+                    if (!defined('_MANAGER_PLUGINFILE_NOTFOUND')) {
+                        define('_MANAGER_PLUGINFILE_NOTFOUND', 'Plugin %s was not loaded (File not found)');
+                    }
+                    ACTIONLOG::add(WARNING, sprintf(_MANAGER_PLUGINFILE_NOTFOUND, $name));
+                    return 0;
+                }
+
+                // load plugin
+                include($fileName);
+
+                // check if class exists (avoid errors in eval'd code)
+                if (!class_exists($name))
+                {
+                    if (!defined('_MANAGER_PLUGINFILE_NOCLASS')) {
+                        define('_MANAGER_PLUGINFILE_NOCLASS', "Plugin %s was not loaded (Class not found in file, possible parse error)");
+                    }
+                    ACTIONLOG::add(WARNING, sprintf(_MANAGER_PLUGINFILE_NOCLASS, $name));
+                    return 0;
+                }
+
+                // add to plugin array
+                eval('$this->plugins[$name] =& new ' . $name . '();');
+
+                // get plugid
+                $this->plugins[$name]->plugid = $this->getPidFromName($name);
+
+                // unload plugin if a prefix is used and the plugin cannot handle this^
+                global $MYSQL_PREFIX;
+                if (($MYSQL_PREFIX != '') && !$this->plugins[$name]->supportsFeature('SqlTablePrefix'))
+                {
+                    unset($this->plugins[$name]);
+                    ACTIONLOG::add(WARNING, sprintf(_MANAGER_PLUGINTABLEPREFIX_NOTSUPPORT, $name));
+                    return 0;
+                }
+
+                // unload plugin if using non-mysql handler and plugin does not support it 
+                global $MYSQL_HANDLER;
+                if ((!in_array('mysql',$MYSQL_HANDLER)) && !$this->plugins[$name]->supportsFeature('SqlApi'))
+                {
+                    unset($this->plugins[$name]);
+                    ACTIONLOG::add(WARNING, sprintf(_MANAGER_PLUGINSQLAPI_NOTSUPPORT, $name));
+                    return 0;
+                }
+
+                // call init method
+                $this->plugins[$name]->init();
+
+        }
+    }
+
+    /**
+     * Returns a PLUGIN object
+     */
+    function &getPlugin($name) {
+        // retrieve the name of the plugin in the right capitalisation
+        $name = $this->getUpperCaseName ($name);
+        // get the plugin   
+        $plugin =& $this->plugins[$name];
+
+        if (!$plugin) {
+            // load class if needed
+            $this->_loadPlugin($name);
+            $plugin =& $this->plugins[$name];
+        }
+        return $plugin;
+    }
+
+    /**
+      * Checks if the given plugin IS loaded or not
+      */
+    function &pluginLoaded($name) {
+        $plugin =& $this->plugins[$name];
+        return $plugin;
+    }
+
+    function &pidLoaded($pid) {
+        $plugin=false;
+        reset($this->plugins);
+        while (list($name) = each($this->plugins)) {
+            if ($pid!=$this->plugins[$name]->getId()) continue;
+            $plugin= & $this->plugins[$name];
+            break;
+        }
+        return $plugin;
+    }
+
+    /**
+      * checks if the given plugin IS installed or not
+      */
+    function pluginInstalled($name) {
+        $this->_initCacheInfo('installedPlugins');
+        return ($this->getPidFromName($name) != -1);
+    }
+
+    function pidInstalled($pid) {
+        $this->_initCacheInfo('installedPlugins');
+        return ($this->cachedInfo['installedPlugins'][$pid] != '');
+    }
+
+    function getPidFromName($name) {
+        $this->_initCacheInfo('installedPlugins');
+        foreach ($this->cachedInfo['installedPlugins'] as $pid => $pfile)
+        {
+            if (strtolower($pfile) == strtolower($name))
+                return $pid;
+        }
+        return -1;
+    }
+
+    /**
+      * Retrieve the name of a plugin in the right capitalisation
+      */
+    function getUpperCaseName ($name) {
+        $this->_initCacheInfo('installedPlugins');
+        foreach ($this->cachedInfo['installedPlugins'] as $pid => $pfile)
+        {
+            if (strtolower($pfile) == strtolower($name))
+                return $pfile;
+        }
+        return -1;
+    }
+
+    function clearCachedInfo($what) {
+        unset($this->cachedInfo[$what]);
+    }
+
+    /**
+     * Loads some info on the first call only
+     */
+    function _initCacheInfo($what)
+    {
+        if (isset($this->cachedInfo[$what]) && is_array($this->cachedInfo[$what]))
+            return;
+        switch ($what)
+        {
+            // 'installedPlugins' = array ($pid => $name)
+            case 'installedPlugins':
+                $this->cachedInfo['installedPlugins'] = array();
+                $res = sql_query('SELECT pid, pfile FROM ' . sql_table('plugin'));
+                while ($o = sql_fetch_object($res))
+                {
+                    $this->cachedInfo['installedPlugins'][$o->pid] = $o->pfile;
+                }
+                break;
+        }
+    }
+
+    /**
+      * A function to notify plugins that something has happened. Only the plugins
+      * that are subscribed to the event will get notified.
+      * Upon the first call, the list of subscriptions will be fetched from the
+      * database. The plugins itsself will only get loaded when they are first needed
+      *
+      * @param $eventName
+      *     Name of the event (method to be called on plugins)
+      * @param $data
+      *     Can contain any type of data, depending on the event type. Usually this is
+      *     an itemid, blogid, ... but it can also be an array containing multiple values
+      */
+    function notify($eventName, $data) {
+        // load subscription list if needed
+        if (!is_array($this->subscriptions))
+            $this->_loadSubscriptions();
+
+
+        // get listening objects
+        $listeners = false;
+        if (isset($this->subscriptions[$eventName])) {
+            $listeners = $this->subscriptions[$eventName];
+        }
+
+        // notify all of them
+        if (is_array($listeners)) {
+            foreach($listeners as $listener) {
+                // load class if needed
+                $this->_loadPlugin($listener);
+                // do notify (if method exists)
+                if (isset($this->plugins[$listener]) && method_exists($this->plugins[$listener], 'event_' . $eventName))
+                    call_user_func(array(&$this->plugins[$listener],'event_' . $eventName), &$data);
+            }
+        }
+
+    }
+
+    /**
+      * Loads plugin subscriptions
+      */
+    function _loadSubscriptions() {
+        // initialize as array
+        $this->subscriptions = array();
+
+        $res = sql_query('SELECT p.pfile as pfile, e.event as event FROM '.sql_table('plugin_event').' as e, '.sql_table('plugin').' as p WHERE e.pid=p.pid ORDER BY p.porder ASC');
+        while ($o = sql_fetch_object($res)) {
+            $pluginName = $o->pfile;
+            $eventName = $o->event;
+            $this->subscriptions[$eventName][] = $pluginName;
+        }
+
+    }
+
+    /*
+        Ticket functions. These are uses by the admin area to make it impossible to simulate certain GET/POST
+        requests. tickets are user specific
+    */
+
+    var $currentRequestTicket = '';
+
+    /**
+     * GET requests: Adds ticket to URL (URL should NOT be html-encoded!, ticket is added at the end)
+     */
+    function addTicketToUrl($url)
+    {
+        $ticketCode = 'ticket=' . $this->_generateTicket();
+        if (strstr($url, '?'))
+            return $url . '&' . $ticketCode;
+        else
+            return $url . '?' . $ticketCode;
+    }
+
+    /**
+     * POST requests: Adds ticket as hidden formvar
+     */
+    function addTicketHidden()
+    {
+        $ticket = $this->_generateTicket();
+
+        echo '<input type="hidden" name="ticket" value="', htmlspecialchars($ticket), '" />';
+    }
+
+    /**
+     * Get a new ticket
+     * (xmlHTTPRequest AutoSaveDraft uses this to refresh the ticket)
+     */
+    function getNewTicket()
+    {
+        $this->currentRequestTicket = '';
+        return $this->_generateTicket();
+    }
+
+    /**
+     * Checks the ticket that was passed along with the current request
+     */
+    function checkTicket()
+    {
+        global $member;
+
+        // get ticket from request
+        $ticket = requestVar('ticket');
+
+        // no ticket -> don't allow
+        if ($ticket == '')
+            return false;
+
+        // remove expired tickets first
+        $this->_cleanUpExpiredTickets();
+
+        // get member id
+        if (!$member->isLoggedIn())
+            $memberId = -1;
+        else
+            $memberId = $member->getID();
+
+        // check if ticket is a valid one
+        $query = 'SELECT COUNT(*) as result FROM ' . sql_table('tickets') . ' WHERE member=' . intval($memberId). ' and ticket=\''.sql_real_escape_string($ticket).'\'';
+        if (quickQuery($query) == 1)
+        {
+            // [in the original implementation, the checked ticket was deleted. This would lead to invalid
+            //  tickets when using the browsers back button and clicking another link/form
+            //  leaving the keys in the database is not a real problem, since they're member-specific and
+            //  only valid for a period of one hour
+            // ]
+            // sql_query('DELETE FROM '.sql_table('tickets').' WHERE member=' . intval($memberId). ' and ticket=\''.sql_real_escape_string($ticket).'\'');
+            return true;
+        } else {
+            // not a valid ticket
+            return false;
+        }
+
+    }
+
+    /**
+     * (internal method) Removes the expired tickets
+     */
+    function _cleanUpExpiredTickets()
+    {
+        // remove tickets older than 1 hour
+        $oldTime = time() - 60 * 60;
+        $query = 'DELETE FROM ' . sql_table('tickets'). ' WHERE ctime < \'' . date('Y-m-d H:i:s',$oldTime) .'\'';
+        sql_query($query);
+    }
+
+    /**
+     * (internal method) Generates/returns a ticket (one ticket per page request)
+     */
+    function _generateTicket()
+    {
+        if ($this->currentRequestTicket == '')
+        {
+            // generate new ticket (only one ticket will be generated per page request)
+            // and store in database
+            global $member;
+            // get member id
+            if (!$member->isLoggedIn())
+                $memberId = -1;
+            else
+                $memberId = $member->getID();
+
+            $ok = false;
+            while (!$ok)
+            {
+                // generate a random token
+                srand((double)microtime()*1000000);
+                $ticket = md5(uniqid(rand(), true));
+
+                // add in database as non-active
+                $query = 'INSERT INTO ' . sql_table('tickets') . ' (ticket, member, ctime) ';
+                $query .= 'VALUES (\'' . sql_real_escape_string($ticket). '\', \'' . intval($memberId). '\', \'' . date('Y-m-d H:i:s',time()) . '\')';
+                if (sql_query($query))
+                    $ok = true;
+            }
+
+            $this->currentRequestTicket = $ticket;
+        }
+        return $this->currentRequestTicket;
+    }
 
 }
 
-?>
+?>
\ No newline at end of file