includes/plugins.php
author Dan
Thu, 06 Mar 2008 23:27:50 -0500
changeset 484 340c81fdd350
parent 464 8063eace5b67
child 507 586fd7d3202d
permissions -rw-r--r--
Fixed session validation bug in upgrade script; fixed non-object reference in template_nodb
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<?php
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/*
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 * Enano - an open-source CMS capable of wiki functions, Drupal-like sidebar blocks, and everything in between
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 * Version 1.1.2 (Caoineag alpha 2)
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 * Copyright (C) 2006-2007 Dan Fuhry
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 *
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 * This program is Free Software; you can redistribute and/or modify it under the terms of the GNU General Public License
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 * as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
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 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for details.
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 */
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/**
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 * Class used to handle and process plugin requests and loading. Singleton.
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 * @package Enano
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 * @author Dan Fuhry <dan@enanocms.org>
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 * @copyright (C) 2006-2008 Enano Project
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 * @license GNU General Public License <http://enanocms.org/Special:GNU_General_Public_License>
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 */
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class pluginLoader {
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  /**
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   * The list of hooks registered.
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   * @var array
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   * @access private
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   */
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  var $hook_list;
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  /**
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   * The list of plugins that should be loaded. Used only by common.php.
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   * @var array
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   * @access private
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   */
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  var $load_list;
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  /**
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   * The list of plugins that are loaded currently. This is only used by the loaded() method which in turn is
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   * used by template files with the <!-- IFPLUGIN --> special tag.
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   * @var array
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   * @access private
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   */
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  var $loaded_plugins;
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  /**
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   * The list of plugins that are always loaded because they're part of the Enano core. This cannot be modified
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   * by any external code because user plugins are loaded after the load_list is calculated. Can be useful in
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   * alternative administration panel frameworks that need the list of system plugins.
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   * @var array
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   */
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  var $system_plugins = Array('SpecialUserFuncs.php','SpecialUserPrefs.php','SpecialPageFuncs.php','SpecialAdmin.php','SpecialCSS.php','SpecialUpdownload.php','SpecialSearch.php','PrivateMessages.php','SpecialGroups.php', 'SpecialRecentChanges.php');
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  /**
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   * Name kept for compatibility. Effectively a constructor. Calculates the list of plugins that should be loaded
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   * and puts that list in the $load_list property. Plugin developers have absolutely no use for this whatsoever.
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   */
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  function loadAll() 
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  {
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    $dir = ENANO_ROOT.'/plugins/';
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    $this->load_list = Array();
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    $plugins = Array();
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    // Open a known directory, and proceed to read its contents
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    if (is_dir($dir))
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    {
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      if ($dh = opendir($dir))
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      {
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        while (($file = readdir($dh)) !== false)
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        {
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          if(preg_match('#^(.*?)\.php$#is', $file))
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          {
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            if(getConfig('plugin_'.$file) == '1' || in_array($file, $this->system_plugins))
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            {
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              $this->load_list[] = $dir . $file;
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              $plugid = substr($file, 0, strlen($file)-4);
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              $f = @file_get_contents($dir . $file);
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              if ( empty($f) )
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                continue;
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              $f = explode("\n", $f);
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              $f = array_slice($f, 2, 7);
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              $f[0] = substr($f[0], 13);
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              $f[1] = substr($f[1], 12);
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              $f[2] = substr($f[2], 13);
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              $f[3] = substr($f[3], 8 );
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              $f[4] = substr($f[4], 9 );
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              $f[5] = substr($f[5], 12);
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              $plugins[$plugid] = Array();
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              $plugins[$plugid]['name'] = $f[0];
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              $plugins[$plugid]['uri']  = $f[1];
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              $plugins[$plugid]['desc'] = $f[2];
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              $plugins[$plugid]['auth'] = $f[3];
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              $plugins[$plugid]['vers'] = $f[4];
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              $plugins[$plugid]['aweb'] = $f[5];
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            }
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          }
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        }
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        closedir($dh);
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      }
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    }
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    $this->loaded_plugins = $plugins;
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    //die('<pre>'.htmlspecialchars(print_r($plugins, true)).'</pre>');
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  }
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  /**
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   * Name kept for compatibility. This method is used to add a new hook into the code somewhere. Plugins are encouraged
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   * to set hooks and hook into other plugins in a fail-safe way, this encourages reuse of code. Returns an array, whose
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   * values should be eval'ed.
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   * @example <code>
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   $code = $plugins->setHook('my_hook_name');
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   foreach ( $code as $cmd )
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   {
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     eval($cmd);
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   }
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   </code>
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   * @param string The name of the hook.
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   * @param array Deprecated.
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   */
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  function setHook($name, $opts = Array()) {
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    if(isset($this->hook_list[$name]) && is_array($this->hook_list[$name]))
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    {
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      return array(implode("\n", $this->hook_list[$name]));
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    }
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    else
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    {
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      return Array();
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    }
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  }
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  /**
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   * Attaches to a hook effectively scheduling some code to be run at that point. You should try to keep hooks clean by
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   * making a function that has variables that need to be modified passed by reference.
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   * @example Simple example: <code>
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   $plugins->attachHook('render_wikiformat_pre', '$text = str_replace("Goodbye, Mr. Chips", "Hello, Mr. Carrots", $text);');
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   </code>
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   * @example More complicated example: <code>
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   $plugins->attachHook('render_wikiformat_pre', 'myplugin_parser_ext($text);');
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   // Notice that $text is passed by reference.
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   function myplugin_parser_ext(&$text)
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   {
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     $text = str_replace("Goodbye, Mr. Chips", "Hello, Mr. Carrots", $text);
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   }
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   </code>
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   */
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  function attachHook($name, $code) {
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    if(!isset($this->hook_list[$name]))
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    {
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      $this->hook_list[$name] = Array();
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    }
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    $this->hook_list[$name][] = $code;
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  }
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  /**
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   * Tell whether a plugin is loaded or not.
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   * @param string The filename of the plugin
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   * @return bool
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   */
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  function loaded($plugid)
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  {
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    return isset( $this->loaded_plugins[$plugid] );
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  }
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}
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?>