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501 lines
15 KiB
PHP
501 lines
15 KiB
PHP
<?php
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/*
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+-----------------------------------------------------------------------+
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| program/include/rcube_plugin_api.php |
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| This file is part of the Roundcube Webmail client |
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| Copyright (C) 2008-2011, The Roundcube Dev Team |
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| Licensed under the GNU General Public License version 3 or |
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| any later version with exceptions for skins & plugins. |
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| See the README file for a full license statement. |
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| PURPOSE: |
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| Plugins repository |
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+-----------------------------------------------------------------------+
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| Author: Thomas Bruederli <roundcube@gmail.com> |
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+-----------------------------------------------------------------------+
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*/
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// location where plugins are loade from
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if (!defined('RCUBE_PLUGINS_DIR'))
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define('RCUBE_PLUGINS_DIR', RCUBE_INSTALL_PATH . 'plugins/');
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/**
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* The plugin loader and global API
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*
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* @package Framework
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* @subpackage PluginAPI
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*/
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class rcube_plugin_api
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{
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static protected $instance;
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public $dir;
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public $url = 'plugins/';
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public $task = '';
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public $output;
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public $handlers = array();
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protected $plugins = array();
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protected $tasks = array();
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protected $actions = array();
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protected $actionmap = array();
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protected $objectsmap = array();
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protected $template_contents = array();
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protected $active_hook = false;
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// Deprecated names of hooks, will be removed after 0.5-stable release
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protected $deprecated_hooks = array(
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'create_user' => 'user_create',
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'kill_session' => 'session_destroy',
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'upload_attachment' => 'attachment_upload',
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'save_attachment' => 'attachment_save',
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'get_attachment' => 'attachment_get',
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'cleanup_attachments' => 'attachments_cleanup',
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'display_attachment' => 'attachment_display',
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'remove_attachment' => 'attachment_delete',
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'outgoing_message_headers' => 'message_outgoing_headers',
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'outgoing_message_body' => 'message_outgoing_body',
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'address_sources' => 'addressbooks_list',
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'get_address_book' => 'addressbook_get',
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'create_contact' => 'contact_create',
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'save_contact' => 'contact_update',
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'contact_save' => 'contact_update',
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'delete_contact' => 'contact_delete',
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'manage_folders' => 'folders_list',
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'list_mailboxes' => 'mailboxes_list',
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'save_preferences' => 'preferences_save',
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'user_preferences' => 'preferences_list',
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'list_prefs_sections' => 'preferences_sections_list',
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'list_identities' => 'identities_list',
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'create_identity' => 'identity_create',
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'delete_identity' => 'identity_delete',
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'save_identity' => 'identity_update',
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'identity_save' => 'identity_update',
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// to be removed after 0.8
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'imap_init' => 'storage_init',
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'mailboxes_list' => 'storage_folders',
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'imap_connect' => 'storage_connect',
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);
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/**
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* This implements the 'singleton' design pattern
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*
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* @return rcube_plugin_api The one and only instance if this class
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*/
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static function get_instance()
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{
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if (!self::$instance) {
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self::$instance = new rcube_plugin_api();
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}
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return self::$instance;
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}
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/**
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* Private constructor
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*/
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protected function __construct()
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{
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$this->dir = slashify(RCUBE_PLUGINS_DIR);
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}
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/**
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* Initialize plugin engine
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*
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* This has to be done after rcmail::load_gui() or rcmail::json_init()
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* was called because plugins need to have access to rcmail->output
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*
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* @param object rcube Instance of the rcube base class
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* @param string Current application task (used for conditional plugin loading)
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*/
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public function init($app, $task = '')
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{
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$this->task = $task;
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$this->output = $app->output;
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// register an internal hook
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$this->register_hook('template_container', array($this, 'template_container_hook'));
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// maybe also register a shudown function which triggers shutdown functions of all plugin objects
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}
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/**
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* Load and init all enabled plugins
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*
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* This has to be done after rcmail::load_gui() or rcmail::json_init()
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* was called because plugins need to have access to rcmail->output
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*
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* @param array List of configured plugins to load
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* @param array List of plugins required by the application
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*/
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public function load_plugins($plugins_enabled, $required_plugins = array())
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{
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foreach ($plugins_enabled as $plugin_name) {
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$this->load_plugin($plugin_name);
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}
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// check existance of all required core plugins
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foreach ($required_plugins as $plugin_name) {
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$loaded = false;
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foreach ($this->plugins as $plugin) {
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if ($plugin instanceof $plugin_name) {
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$loaded = true;
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break;
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}
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}
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// load required core plugin if no derivate was found
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if (!$loaded)
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$loaded = $this->load_plugin($plugin_name);
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// trigger fatal error if still not loaded
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if (!$loaded) {
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rcube::raise_error(array('code' => 520, 'type' => 'php',
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'file' => __FILE__, 'line' => __LINE__,
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'message' => "Requried plugin $plugin_name was not loaded"), true, true);
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}
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}
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}
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/**
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* Load the specified plugin
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*
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* @param string Plugin name
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* @return boolean True on success, false if not loaded or failure
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*/
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public function load_plugin($plugin_name)
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{
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static $plugins_dir;
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if (!$plugins_dir) {
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$dir = dir($this->dir);
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$plugins_dir = unslashify($dir->path);
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}
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// plugin already loaded
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if ($this->plugins[$plugin_name] || class_exists($plugin_name, false))
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return true;
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$fn = $plugins_dir . DIRECTORY_SEPARATOR . $plugin_name . DIRECTORY_SEPARATOR . $plugin_name . '.php';
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if (file_exists($fn)) {
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include($fn);
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// instantiate class if exists
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if (class_exists($plugin_name, false)) {
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$plugin = new $plugin_name($this);
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// check inheritance...
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if (is_subclass_of($plugin, 'rcube_plugin')) {
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// ... task, request type and framed mode
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if ((!$plugin->task || preg_match('/^('.$plugin->task.')$/i', $this->task))
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&& (!$plugin->noajax || (is_object($this->output) && $this->output->type == 'html'))
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&& (!$plugin->noframe || empty($_REQUEST['_framed']))
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) {
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$plugin->init();
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$this->plugins[$plugin_name] = $plugin;
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}
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return true;
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}
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}
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else {
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rcube::raise_error(array('code' => 520, 'type' => 'php',
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'file' => __FILE__, 'line' => __LINE__,
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'message' => "No plugin class $plugin_name found in $fn"), true, false);
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}
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}
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else {
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rcube::raise_error(array('code' => 520, 'type' => 'php',
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'file' => __FILE__, 'line' => __LINE__,
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'message' => "Failed to load plugin file $fn"), true, false);
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}
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return false;
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}
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/**
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* Allows a plugin object to register a callback for a certain hook
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*
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* @param string $hook Hook name
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* @param mixed $callback String with global function name or array($obj, 'methodname')
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*/
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public function register_hook($hook, $callback)
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{
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if (is_callable($callback)) {
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if (isset($this->deprecated_hooks[$hook])) {
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rcube::raise_error(array('code' => 522, 'type' => 'php',
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'file' => __FILE__, 'line' => __LINE__,
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'message' => "Deprecated hook name. ".$hook.' -> '.$this->deprecated_hooks[$hook]), true, false);
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$hook = $this->deprecated_hooks[$hook];
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}
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$this->handlers[$hook][] = $callback;
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}
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else
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rcube::raise_error(array('code' => 521, 'type' => 'php',
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'file' => __FILE__, 'line' => __LINE__,
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'message' => "Invalid callback function for $hook"), true, false);
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}
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/**
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* Allow a plugin object to unregister a callback.
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*
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* @param string $hook Hook name
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* @param mixed $callback String with global function name or array($obj, 'methodname')
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*/
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public function unregister_hook($hook, $callback)
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{
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$callback_id = array_search($callback, $this->handlers[$hook]);
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if ($callback_id !== false) {
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unset($this->handlers[$hook][$callback_id]);
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}
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}
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/**
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* Triggers a plugin hook.
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* This is called from the application and executes all registered handlers
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*
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* @param string $hook Hook name
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* @param array $args Named arguments (key->value pairs)
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* @return array The (probably) altered hook arguments
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*/
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public function exec_hook($hook, $args = array())
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{
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if (!is_array($args))
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$args = array('arg' => $args);
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$args += array('abort' => false);
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$this->active_hook = $hook;
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foreach ((array)$this->handlers[$hook] as $callback) {
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$ret = call_user_func($callback, $args);
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if ($ret && is_array($ret))
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$args = $ret + $args;
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if ($args['abort'])
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break;
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}
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$this->active_hook = false;
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return $args;
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}
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/**
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* Let a plugin register a handler for a specific request
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*
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* @param string $action Action name (_task=mail&_action=plugin.foo)
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* @param string $owner Plugin name that registers this action
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* @param mixed $callback Callback: string with global function name or array($obj, 'methodname')
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* @param string $task Task name registered by this plugin
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*/
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public function register_action($action, $owner, $callback, $task = null)
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{
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// check action name
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if ($task)
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$action = $task.'.'.$action;
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else if (strpos($action, 'plugin.') !== 0)
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$action = 'plugin.'.$action;
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// can register action only if it's not taken or registered by myself
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if (!isset($this->actionmap[$action]) || $this->actionmap[$action] == $owner) {
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$this->actions[$action] = $callback;
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$this->actionmap[$action] = $owner;
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}
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else {
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rcube::raise_error(array('code' => 523, 'type' => 'php',
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'file' => __FILE__, 'line' => __LINE__,
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'message' => "Cannot register action $action; already taken by another plugin"), true, false);
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}
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}
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/**
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* This method handles requests like _task=mail&_action=plugin.foo
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* It executes the callback function that was registered with the given action.
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*
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* @param string $action Action name
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*/
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public function exec_action($action)
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{
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if (isset($this->actions[$action])) {
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call_user_func($this->actions[$action]);
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}
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else if (rcube::get_instance()->action != 'refresh') {
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rcube::raise_error(array('code' => 524, 'type' => 'php',
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'file' => __FILE__, 'line' => __LINE__,
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'message' => "No handler found for action $action"), true, true);
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}
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}
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/**
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* Register a handler function for template objects
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*
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* @param string $name Object name
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* @param string $owner Plugin name that registers this action
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* @param mixed $callback Callback: string with global function name or array($obj, 'methodname')
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*/
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public function register_handler($name, $owner, $callback)
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{
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// check name
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if (strpos($name, 'plugin.') !== 0)
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$name = 'plugin.'.$name;
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// can register handler only if it's not taken or registered by myself
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if (is_object($this->output) && (!isset($this->objectsmap[$name]) || $this->objectsmap[$name] == $owner)) {
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$this->output->add_handler($name, $callback);
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$this->objectsmap[$name] = $owner;
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}
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else {
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rcube::raise_error(array('code' => 525, 'type' => 'php',
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'file' => __FILE__, 'line' => __LINE__,
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'message' => "Cannot register template handler $name; already taken by another plugin or no output object available"), true, false);
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}
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}
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/**
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* Register this plugin to be responsible for a specific task
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*
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* @param string $task Task name (only characters [a-z0-9_.-] are allowed)
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* @param string $owner Plugin name that registers this action
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*/
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public function register_task($task, $owner)
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{
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// tasks are irrelevant in framework mode
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if (!class_exists('rcmail', false))
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return true;
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if ($task != asciiwords($task)) {
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rcube::raise_error(array('code' => 526, 'type' => 'php',
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'file' => __FILE__, 'line' => __LINE__,
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'message' => "Invalid task name: $task. Only characters [a-z0-9_.-] are allowed"), true, false);
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}
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else if (in_array($task, rcmail::$main_tasks)) {
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rcube::raise_error(array('code' => 526, 'type' => 'php',
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'file' => __FILE__, 'line' => __LINE__,
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'message' => "Cannot register taks $task; already taken by another plugin or the application itself"), true, false);
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}
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else {
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$this->tasks[$task] = $owner;
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rcmail::$main_tasks[] = $task;
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return true;
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}
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return false;
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}
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/**
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* Checks whether the given task is registered by a plugin
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*
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* @param string $task Task name
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* @return boolean True if registered, otherwise false
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*/
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public function is_plugin_task($task)
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{
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return $this->tasks[$task] ? true : false;
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}
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/**
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* Check if a plugin hook is currently processing.
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* Mainly used to prevent loops and recursion.
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*
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* @param string $hook Hook to check (optional)
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* @return boolean True if any/the given hook is currently processed, otherwise false
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*/
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public function is_processing($hook = null)
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{
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return $this->active_hook && (!$hook || $this->active_hook == $hook);
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}
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/**
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* Include a plugin script file in the current HTML page
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*
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* @param string $fn Path to script
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*/
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public function include_script($fn)
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{
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if (is_object($this->output) && $this->output->type == 'html') {
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$src = $this->resource_url($fn);
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$this->output->add_header(html::tag('script', array('type' => "text/javascript", 'src' => $src)));
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}
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}
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/**
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* Include a plugin stylesheet in the current HTML page
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*
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* @param string $fn Path to stylesheet
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*/
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public function include_stylesheet($fn)
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{
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if (is_object($this->output) && $this->output->type == 'html') {
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$src = $this->resource_url($fn);
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$this->output->include_css($src);
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}
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}
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/**
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* Save the given HTML content to be added to a template container
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*
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* @param string $html HTML content
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* @param string $container Template container identifier
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*/
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public function add_content($html, $container)
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{
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$this->template_contents[$container] .= $html . "\n";
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}
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/**
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* Returns list of loaded plugins names
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*
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* @return array List of plugin names
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*/
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public function loaded_plugins()
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{
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return array_keys($this->plugins);
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}
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/**
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* Callback for template_container hooks
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*
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* @param array $attrib
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* @return array
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*/
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protected function template_container_hook($attrib)
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{
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$container = $attrib['name'];
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return array('content' => $attrib['content'] . $this->template_contents[$container]);
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}
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/**
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* Make the given file name link into the plugins directory
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*
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* @param string $fn Filename
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* @return string
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*/
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protected function resource_url($fn)
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{
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if ($fn[0] != '/' && !preg_match('|^https?://|i', $fn))
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return $this->url . $fn;
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else
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return $fn;
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}
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}
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