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rcube_plugin_api.php
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rcube_plugin_api.php
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<?php
/*
+-----------------------------------------------------------------------+
| program/include/rcube_plugin_api.php |
| |
| This file is part of the Roundcube Webmail client |
| Copyright (C) 2008-2009, Roundcube Dev. - Switzerland |
| Licensed under the GNU GPL |
| |
| PURPOSE: |
| Plugins repository |
| |
+-----------------------------------------------------------------------+
| Author: Thomas Bruederli <roundcube@gmail.com> |
+-----------------------------------------------------------------------+
$Id$
*/
/**
* The plugin loader and global API
*
* @package PluginAPI
*/
class rcube_plugin_api
{
static private $instance;
public $dir;
public $url = 'plugins/';
public $output;
public $handlers = array();
private $plugins = array();
private $tasks = array();
private $actions = array();
private $actionmap = array();
private $objectsmap = array();
private $template_contents = array();
private $required_plugins = array('filesystem_attachments');
private $active_hook = false;
// Deprecated names of hooks, will be removed after 0.5-stable release
private $deprecated_hooks = array(
'create_user' => 'user_create',
'kill_session' => 'session_destroy',
'upload_attachment' => 'attachment_upload',
'save_attachment' => 'attachment_save',
'get_attachment' => 'attachment_get',
'cleanup_attachments' => 'attachments_cleanup',
'display_attachment' => 'attachment_display',
'remove_attachment' => 'attachment_delete',
'outgoing_message_headers' => 'message_outgoing_headers',
'outgoing_message_body' => 'message_outgoing_body',
'address_sources' => 'addressbooks_list',
'get_address_book' => 'addressbook_get',
'create_contact' => 'contact_create',
'save_contact' => 'contact_update',
'contact_save' => 'contact_update',
'delete_contact' => 'contact_delete',
'manage_folders' => 'folders_list',
'list_mailboxes' => 'mailboxes_list',
'save_preferences' => 'preferences_save',
'user_preferences' => 'preferences_list',
'list_prefs_sections' => 'preferences_sections_list',
'list_identities' => 'identities_list',
'create_identity' => 'identity_create',
'delete_identity' => 'identity_delete',
'save_identity' => 'identity_update',
'identity_save' => 'identity_update',
);
/**
* This implements the 'singleton' design pattern
*
* @return object rcube_plugin_api The one and only instance if this class
*/
static function get_instance()
{
if (!self::$instance) {
self::$instance = new rcube_plugin_api();
}
return self::$instance;
}
/**
* Private constructor
*/
private function __construct()
{
$this->dir = INSTALL_PATH . $this->url;
}
/**
* Load and init all enabled plugins
*
* This has to be done after rcmail::load_gui() or rcmail::json_init()
* was called because plugins need to have access to rcmail->output
*/
public function init()
{
$rcmail = rcmail::get_instance();
$this->output = $rcmail->output;
$plugins_dir = dir($this->dir);
$plugins_dir = unslashify($plugins_dir->path);
$plugins_enabled = (array)$rcmail->config->get('plugins', array());
foreach ($plugins_enabled as $plugin_name) {
$fn = $plugins_dir . DIRECTORY_SEPARATOR . $plugin_name . DIRECTORY_SEPARATOR . $plugin_name . '.php';
if (file_exists($fn)) {
include($fn);
// instantiate class if exists
if (class_exists($plugin_name, false)) {
$plugin = new $plugin_name($this);
// check inheritance and task specification
if (is_subclass_of($plugin, 'rcube_plugin') && (!$plugin->task || preg_match('/^('.$plugin->task.')$/i', $rcmail->task))) {
$plugin->init();
$this->plugins[] = $plugin;
}
}
else {
raise_error(array('code' => 520, 'type' => 'php',
'file' => __FILE__, 'line' => __LINE__,
'message' => "No plugin class $plugin_name found in $fn"), true, false);
}
}
else {
raise_error(array('code' => 520, 'type' => 'php',
'file' => __FILE__, 'line' => __LINE__,
'message' => "Failed to load plugin file $fn"), true, false);
}
}
// check existance of all required core plugins
foreach ($this->required_plugins as $plugin_name) {
$loaded = false;
foreach ($this->plugins as $plugin) {
if ($plugin instanceof $plugin_name) {
$loaded = true;
break;
}
}
// load required core plugin if no derivate was found
if (!$loaded) {
$fn = $plugins_dir . DIRECTORY_SEPARATOR . $plugin_name . DIRECTORY_SEPARATOR . $plugin_name . '.php';
if (file_exists($fn)) {
include_once($fn);
if (class_exists($plugin_name, false)) {
$plugin = new $plugin_name($this);
// check inheritance
if (is_subclass_of($plugin, 'rcube_plugin')) {
if (!$plugin->task || preg_match('/('.$plugin->task.')/i', $rcmail->task)) {
$plugin->init();
$this->plugins[] = $plugin;
}
$loaded = true;
}
}
}
}
// trigger fatal error if still not loaded
if (!$loaded) {
raise_error(array('code' => 520, 'type' => 'php',
'file' => __FILE__, 'line' => __LINE__,
'message' => "Requried plugin $plugin_name was not loaded"), true, true);
}
}
// register an internal hook
$this->register_hook('template_container', array($this, 'template_container_hook'));
// maybe also register a shudown function which triggers shutdown functions of all plugin objects
}
/**
* Allows a plugin object to register a callback for a certain hook
*
* @param string Hook name
* @param mixed String with global function name or array($obj, 'methodname')
*/
public function register_hook($hook, $callback)
{
if (is_callable($callback)) {
if (isset($this->deprecated_hooks[$hook])) {
raise_error(array('code' => 522, 'type' => 'php',
'file' => __FILE__, 'line' => __LINE__,
'message' => "Deprecated hook name. ".$hook.' -> '.$this->deprecated_hooks[$hook]), true, false);
$hook = $this->deprecated_hooks[$hook];
}
$this->handlers[$hook][] = $callback;
}
else
raise_error(array('code' => 521, 'type' => 'php',
'file' => __FILE__, 'line' => __LINE__,
'message' => "Invalid callback function for $hook"), true, false);
}
/**
* Triggers a plugin hook.
* This is called from the application and executes all registered handlers
*
* @param string Hook name
* @param array Named arguments (key->value pairs)
* @return array The (probably) altered hook arguments
*/
public function exec_hook($hook, $args = array())
{
if (!is_array($args))
$args = array('arg' => $args);
$args += array('abort' => false);
$this->active_hook = $hook;
foreach ((array)$this->handlers[$hook] as $callback) {
$ret = call_user_func($callback, $args);
if ($ret && is_array($ret))
$args = $ret + $args;
if ($args['abort'])
break;
}
$this->active_hook = false;
return $args;
}
/**
* Let a plugin register a handler for a specific request
*
* @param string Action name (_task=mail&_action=plugin.foo)
* @param string Plugin name that registers this action
* @param mixed Callback: string with global function name or array($obj, 'methodname')
* @param string Task name registered by this plugin
*/
public function register_action($action, $owner, $callback, $task = null)
{
// check action name
if ($task)
$action = $task.'.'.$action;
else if (strpos($action, 'plugin.') !== 0)
$action = 'plugin.'.$action;
// can register action only if it's not taken or registered by myself
if (!isset($this->actionmap[$action]) || $this->actionmap[$action] == $owner) {
$this->actions[$action] = $callback;
$this->actionmap[$action] = $owner;
}
else {
raise_error(array('code' => 523, 'type' => 'php',
'file' => __FILE__, 'line' => __LINE__,
'message' => "Cannot register action $action; already taken by another plugin"), true, false);
}
}
/**
* This method handles requests like _task=mail&_action=plugin.foo
* It executes the callback function that was registered with the given action.
*
* @param string Action name
*/
public function exec_action($action)
{
if (isset($this->actions[$action])) {
call_user_func($this->actions[$action]);
}
else {
raise_error(array('code' => 524, 'type' => 'php',
'file' => __FILE__, 'line' => __LINE__,
'message' => "No handler found for action $action"), true, true);
}
}
/**
* Register a handler function for template objects
*
* @param string Object name
* @param string Plugin name that registers this action
* @param mixed Callback: string with global function name or array($obj, 'methodname')
*/
public function register_handler($name, $owner, $callback)
{
// check name
if (strpos($name, 'plugin.') !== 0)
$name = 'plugin.'.$name;
// can register handler only if it's not taken or registered by myself
if (!isset($this->objectsmap[$name]) || $this->objectsmap[$name] == $owner) {
$this->output->add_handler($name, $callback);
$this->objectsmap[$name] = $owner;
}
else {
raise_error(array('code' => 525, 'type' => 'php',
'file' => __FILE__, 'line' => __LINE__,
'message' => "Cannot register template handler $name; already taken by another plugin"), true, false);
}
}
/**
* Register this plugin to be responsible for a specific task
*
* @param string Task name (only characters [a-z0-9_.-] are allowed)
* @param string Plugin name that registers this action
*/
public function register_task($task, $owner)
{
if ($task != asciiwords($task)) {
raise_error(array('code' => 526, 'type' => 'php',
'file' => __FILE__, 'line' => __LINE__,
'message' => "Invalid task name: $task. Only characters [a-z0-9_.-] are allowed"), true, false);
}
else if (in_array($task, rcmail::$main_tasks)) {
raise_error(array('code' => 526, 'type' => 'php',
'file' => __FILE__, 'line' => __LINE__,
'message' => "Cannot register taks $task; already taken by another plugin or the application itself"), true, false);
}
else {
$this->tasks[$task] = $owner;
rcmail::$main_tasks[] = $task;
return true;
}
return false;
}
/**
* Checks whether the given task is registered by a plugin
*
* @return boolean True if registered, otherwise false
*/
public function is_plugin_task($task)
{
return $this->tasks[$task] ? true : false;
}
/**
* Check if a plugin hook is currently processing.
* Mainly used to prevent loops and recursion.
*
* @param string Hook to check (optional)
* @return boolean True if any/the given hook is currently processed, otherwise false
*/
public function is_processing($hook = null)
{
return $this->active_hook && (!$hook || $this->active_hook == $hook);
}
/**
* Include a plugin script file in the current HTML page
*/
public function include_script($fn)
{
if ($this->output->type == 'html') {
$src = $this->resource_url($fn);
$this->output->add_header(html::tag('script', array('type' => "text/javascript", 'src' => $src)));
}
}
/**
* Include a plugin stylesheet in the current HTML page
*/
public function include_stylesheet($fn)
{
if ($this->output->type == 'html') {
$src = $this->resource_url($fn);
$this->output->add_header(html::tag('link', array('rel' => "stylesheet", 'type' => "text/css", 'href' => $src)));
}
}
/**
* Save the given HTML content to be added to a template container
*/
public function add_content($html, $container)
{
$this->template_contents[$container] .= $html . "\n";
}
/**
* Callback for template_container hooks
*/
private function template_container_hook($attrib)
{
$container = $attrib['name'];
return array('content' => $attrib['content'] . $this->template_contents[$container]);
}
/**
* Make the given file name link into the plugins directory
*/
private function resource_url($fn)
{
if ($fn[0] != '/' && !preg_match('|^https?://|i', $fn))
return $this->url . $fn;
else
return $fn;
}
}

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