Viewing file:  rcube_plugin_api.php (17.19 KB) -rw-r--r--
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<?php
/*
+-----------------------------------------------------------------------+
| This file is part of the Roundcube Webmail client |
| Copyright (C) 2008-2012, The Roundcube Dev Team |
| |
| Licensed under the GNU General Public License version 3 or |
| any later version with exceptions for skins & plugins. |
| See the README file for a full license statement. |
| |
| PURPOSE: |
| Plugins repository |
+-----------------------------------------------------------------------+
| Author: Thomas Bruederli <roundcube@gmail.com> |
+-----------------------------------------------------------------------+
*/
// location where plugins are loade from
if (!defined('RCUBE_PLUGINS_DIR')) {
define('RCUBE_PLUGINS_DIR', RCUBE_INSTALL_PATH . 'plugins/');
}
/**
* The plugin loader and global API
*
* @package Framework
* @subpackage PluginAPI
*/
class rcube_plugin_api
{
static protected $instance;
public $dir;
public $url = 'plugins/';
public $task = '';
public $output;
public $handlers = array();
public $allowed_prefs = array();
public $allowed_session_prefs = array();
protected $plugins = array();
protected $tasks = array();
protected $actions = array();
protected $actionmap = array();
protected $objectsmap = array();
protected $template_contents = array();
protected $active_hook = false;
// Deprecated names of hooks, will be removed after 0.5-stable release
protected $deprecated_hooks = array(
'create_user' => 'user_create',
'kill_session' => 'session_destroy',
'upload_attachment' => 'attachment_upload',
'save_attachment' => 'attachment_save',
'get_attachment' => 'attachment_get',
'cleanup_attachments' => 'attachments_cleanup',
'display_attachment' => 'attachment_display',
'remove_attachment' => 'attachment_delete',
'outgoing_message_headers' => 'message_outgoing_headers',
'outgoing_message_body' => 'message_outgoing_body',
'address_sources' => 'addressbooks_list',
'get_address_book' => 'addressbook_get',
'create_contact' => 'contact_create',
'save_contact' => 'contact_update',
'contact_save' => 'contact_update',
'delete_contact' => 'contact_delete',
'manage_folders' => 'folders_list',
'list_mailboxes' => 'mailboxes_list',
'save_preferences' => 'preferences_save',
'user_preferences' => 'preferences_list',
'list_prefs_sections' => 'preferences_sections_list',
'list_identities' => 'identities_list',
'create_identity' => 'identity_create',
'delete_identity' => 'identity_delete',
'save_identity' => 'identity_update',
'identity_save' => 'identity_update',
// to be removed after 0.8
'imap_init' => 'storage_init',
'mailboxes_list' => 'storage_folders',
'imap_connect' => 'storage_connect',
);
/**
* This implements the 'singleton' design pattern
*
* @return rcube_plugin_api The one and only instance if this class
*/
static function get_instance()
{
if (!self::$instance) {
self::$instance = new rcube_plugin_api();
}
return self::$instance;
}
/**
* Private constructor
*/
protected function __construct()
{
$this->dir = slashify(RCUBE_PLUGINS_DIR);
}
/**
* Initialize plugin engine
*
* This has to be done after rcmail::load_gui() or rcmail::json_init()
* was called because plugins need to have access to rcmail->output
*
* @param object rcube Instance of the rcube base class
* @param string Current application task (used for conditional plugin loading)
*/
public function init($app, $task = '')
{
$this->task = $task;
$this->output = $app->output;
// 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
}
/**
* 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
*
* @param array List of configured plugins to load
* @param array List of plugins required by the application
*/
public function load_plugins($plugins_enabled, $required_plugins = array())
{
foreach ($plugins_enabled as $plugin_name) {
$this->load_plugin($plugin_name);
}
// check existance of all required core plugins
foreach ($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) {
$loaded = $this->load_plugin($plugin_name);
}
// trigger fatal error if still not loaded
if (!$loaded) {
rcube::raise_error(array(
'code' => 520, 'type' => 'php',
'file' => __FILE__, 'line' => __LINE__,
'message' => "Requried plugin $plugin_name was not loaded"), true, true);
}
}
}
/**
* Load the specified plugin
*
* @param string Plugin name
*
* @return boolean True on success, false if not loaded or failure
*/
public function load_plugin($plugin_name)
{
static $plugins_dir;
if (!$plugins_dir) {
$dir = dir($this->dir);
$plugins_dir = unslashify($dir->path);
}
// plugin already loaded
if ($this->plugins[$plugin_name] || class_exists($plugin_name, false)) {
return true;
}
$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...
if (is_subclass_of($plugin, 'rcube_plugin')) {
// ... task, request type and framed mode
if ((!$plugin->task || preg_match('/^('.$plugin->task.')$/i', $this->task))
&& (!$plugin->noajax || (is_object($this->output) && $this->output->type == 'html'))
&& (!$plugin->noframe || empty($_REQUEST['_framed']))
) {
$plugin->init();
$this->plugins[$plugin_name] = $plugin;
}
if (!empty($plugin->allowed_prefs)) {
$this->allowed_prefs = array_merge($this->allowed_prefs, $plugin->allowed_prefs);
}
return true;
}
}
else {
rcube::raise_error(array('code' => 520, 'type' => 'php',
'file' => __FILE__, 'line' => __LINE__,
'message' => "No plugin class $plugin_name found in $fn"),
true, false);
}
}
else {
rcube::raise_error(array('code' => 520, 'type' => 'php',
'file' => __FILE__, 'line' => __LINE__,
'message' => "Failed to load plugin file $fn"), true, false);
}
return false;
}
/**
* Allows a plugin object to register a callback for a certain hook
*
* @param string $hook Hook name
* @param mixed $callback String with global function name or array($obj, 'methodname')
*/
public function register_hook($hook, $callback)
{
if (is_callable($callback)) {
if (isset($this->deprecated_hooks[$hook])) {
rcube::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 {
rcube::raise_error(array('code' => 521, 'type' => 'php',
'file' => __FILE__, 'line' => __LINE__,
'message' => "Invalid callback function for $hook"), true, false);
}
}
/**
* Allow a plugin object to unregister a callback.
*
* @param string $hook Hook name
* @param mixed $callback String with global function name or array($obj, 'methodname')
*/
public function unregister_hook($hook, $callback)
{
$callback_id = array_search($callback, $this->handlers[$hook]);
if ($callback_id !== false) {
unset($this->handlers[$hook][$callback_id]);
}
}
/**
* Triggers a plugin hook.
* This is called from the application and executes all registered handlers
*
* @param string $hook Hook name
* @param array $args Named arguments (key->value pairs)
*
* @return array The (probably) altered hook arguments
*/
public function exec_hook($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 Action name (_task=mail&_action=plugin.foo)
* @param string $owner Plugin name that registers this action
* @param mixed $callback Callback: string with global function name or array($obj, 'methodname')
* @param string $task Task name registered by this plugin
*/
public function register_action($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 {
rcube::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 $action Action name
*/
public function exec_action($action)
{
if (isset($this->actions[$action])) {
call_user_func($this->actions[$action]);
}
else if (rcube::get_instance()->action != 'refresh') {
rcube::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 $name Object name
* @param string $owner Plugin name that registers this action
* @param mixed $callback Callback: string with global function name or array($obj, 'methodname')
*/
public function register_handler($name, $owner, $callback)
{
// check name
if (strpos($name, 'plugin.') !== 0) {
$name = 'plugin.' . $name;
}
// can register handler only if it's not taken or registered by myself
if (is_object($this->output)
&& (!isset($this->objectsmap[$name]) || $this->objectsmap[$name] == $owner)
) {
$this->output->add_handler($name, $callback);
$this->objectsmap[$name] = $owner;
}
else {
rcube::raise_error(array('code' => 525, 'type' => 'php',
'file' => __FILE__, 'line' => __LINE__,
'message' => "Cannot register template handler $name;"
." already taken by another plugin or no output object available"), true, false);
}
}
/**
* Register this plugin to be responsible for a specific task
*
* @param string $task Task name (only characters [a-z0-9_.-] are allowed)
* @param string $owner Plugin name that registers this action
*/
public function register_task($task, $owner)
{
// tasks are irrelevant in framework mode
if (!class_exists('rcmail', false)) {
return true;
}
if ($task != asciiwords($task)) {
rcube::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)) {
rcube::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
*
* @param string $task Task name
*
* @return boolean True if registered, otherwise false
*/
public function is_plugin_task($task)
{
return $this->tasks[$task] ? true : false;
}
/**
* Check if a plugin hook is currently processing.
* Mainly used to prevent loops and recursion.
*
* @param string $hook Hook to check (optional)
*
* @return boolean True if any/the given hook is currently processed, otherwise false
*/
public function is_processing($hook = null)
{
return $this->active_hook && (!$hook || $this->active_hook == $hook);
}
/**
* Include a plugin script file in the current HTML page
*
* @param string $fn Path to script
*/
public function include_script($fn)
{
if (is_object($this->output) && $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
*
* @param string $fn Path to stylesheet
*/
public function include_stylesheet($fn)
{
if (is_object($this->output) && $this->output->type == 'html') {
$src = $this->resource_url($fn);
$this->output->include_css($src);
}
}
/**
* Save the given HTML content to be added to a template container
*
* @param string $html HTML content
* @param string $container Template container identifier
*/
public function add_content($html, $container)
{
$this->template_contents[$container] .= $html . "\n";
}
/**
* Returns list of loaded plugins names
*
* @return array List of plugin names
*/
public function loaded_plugins()
{
return array_keys($this->plugins);
}
/**
* Callback for template_container hooks
*
* @param array $attrib
* @return array
*/
protected function template_container_hook($attrib)
{
$container = $attrib['name'];
return array('content' => $attrib['content'] . $this->template_contents[$container]);
}
/**
* Make the given file name link into the plugins directory
*
* @param string $fn Filename
* @return string
*/
protected function resource_url($fn)
{
if ($fn[0] != '/' && !preg_match('|^https?://|i', $fn))
return $this->url . $fn;
else
return $fn;
}
}
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