rcube_plugin_api.php
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rcube_plugin_api.php
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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();

	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;
	}

	/**
	* Get information about a specific plugin.
	* This is either provided my a plugin's info() method or extracted from a package.xml or a composer.json file
	*
	* @param string Plugin name
	* @return array Meta information about a plugin or False if plugin was not found
	*/
	public function get_info($plugin_name)
	{
	static $composer_lock, $license_uris = array(
	'Apache' => 'http://www.apache.org/licenses/LICENSE-2.0.html',
	'Apache-2' => 'http://www.apache.org/licenses/LICENSE-2.0.html',
	'Apache-1' => 'http://www.apache.org/licenses/LICENSE-1.0',
	'Apache-1.1' => 'http://www.apache.org/licenses/LICENSE-1.1',
	'GPL' => 'http://www.gnu.org/licenses/gpl.html',
	'GPLv2' => 'http://www.gnu.org/licenses/gpl-2.0.html',
	'GPL-2.0' => 'http://www.gnu.org/licenses/gpl-2.0.html',
	'GPLv3' => 'http://www.gnu.org/licenses/gpl-3.0.html',
	'GPL-3.0' => 'http://www.gnu.org/licenses/gpl-3.0.html',
	'GPL-3.0+' => 'http://www.gnu.org/licenses/gpl.html',
	'GPL-2.0+' => 'http://www.gnu.org/licenses/gpl.html',
	'LGPL' => 'http://www.gnu.org/licenses/lgpl.html',
	'LGPLv2' => 'http://www.gnu.org/licenses/lgpl-2.0.html',
	'LGPLv2.1' => 'http://www.gnu.org/licenses/lgpl-2.1.html',
	'LGPLv3' => 'http://www.gnu.org/licenses/lgpl.html',
	'LGPL-2.0' => 'http://www.gnu.org/licenses/lgpl-2.0.html',
	'LGPL-2.1' => 'http://www.gnu.org/licenses/lgpl-2.1.html',
	'LGPL-3.0' => 'http://www.gnu.org/licenses/lgpl.html',
	'LGPL-3.0+' => 'http://www.gnu.org/licenses/lgpl.html',
	'BSD' => 'http://opensource.org/licenses/bsd-license.html',
	'BSD-2-Clause' => 'http://opensource.org/licenses/BSD-2-Clause',
	'BSD-3-Clause' => 'http://opensource.org/licenses/BSD-3-Clause',
	'FreeBSD' => 'http://opensource.org/licenses/BSD-2-Clause',
	'MIT' => 'http://www.opensource.org/licenses/mit-license.php',
	'PHP' => 'http://opensource.org/licenses/PHP-3.0',
	'PHP-3' => 'http://www.php.net/license/3_01.txt',
	'PHP-3.0' => 'http://www.php.net/license/3_0.txt',
	'PHP-3.01' => 'http://www.php.net/license/3_01.txt',
	);

	$dir = dir($this->dir);
	$fn = unslashify($dir->path) . DIRECTORY_SEPARATOR . $plugin_name . DIRECTORY_SEPARATOR . $plugin_name . '.php';
	$info = false;

	if (!class_exists($plugin_name))
	include($fn);

	if (class_exists($plugin_name))
	$info = $plugin_name::info();

	// fall back to composer.json file
	if (!$info) {
	$composer = INSTALL_PATH . "/plugins/$plugin_name/composer.json";
	if (file_exists($composer) && ($json = @json_decode(file_get_contents($composer), true))) {
	list($info['vendor'], $info['name']) = explode('/', $json['name']);
	$info['license'] = $json['license'];
	if ($license_uri = $license_uris[$info['license']])
	$info['license_uri'] = $license_uri;
	}

	// read local composer.lock file (once)
	if (!isset($composer_lock)) {
	$composer_lock = @json_decode(@file_get_contents(INSTALL_PATH . "/composer.lock"), true);
	if ($composer_lock['packages']) {
	foreach ($composer_lock['packages'] as $i => $package) {
	$composer_lock['installed'][$package['name']] = $package;
	}
	}
	}

	// load additional information from local composer.lock file
	if ($lock = $composer_lock['installed'][$json['name']]) {
	$info['version'] = $lock['version'];
	$info['uri'] = $lock['homepage'] ? $lock['homepage'] : $lock['source']['uri'];
	$info['src_uri'] = $lock['dist']['uri'] ? $lock['dist']['uri'] : $lock['source']['uri'];
	}
	}

	// fall back to package.xml file
	if (!$info) {
	$package = INSTALL_PATH . "/plugins/$plugin_name/package.xml";
	if (file_exists($package) && ($file = file_get_contents($package))) {
	$doc = new DOMDocument();
	$doc->loadXML($file);
	$xpath = new DOMXPath($doc);
	$xpath->registerNamespace('rc', "http://pear.php.net/dtd/package-2.0");

	// XPaths of plugin metadata elements
	$metadata = array(
	'name' => 'string(//rc:package/rc:name)',
	'version' => 'string(//rc:package/rc:version/rc:release)',
	'license' => 'string(//rc:package/rc:license)',
	'license_uri' => 'string(//rc:package/rc:license/@uri)',
	'src_uri' => 'string(//rc:package/rc:srcuri)',
	'uri' => 'string(//rc:package/rc:uri)',
	);

	foreach ($metadata as $key => $path) {
	$info[$key] = $xpath->evaluate($path);
	}

	// dependent required plugins (can be used, but not included in config)
	$deps = $xpath->evaluate('//rc:package/rc:dependencies/rc:required/rc:package/rc:name');
	for ($i = 0; $i < $deps->length; $i++) {
	$dn = $deps->item($i)->nodeValue;
	$info['requires'][] = $dn;
	}
	}
	}

	return $info;
	}

	/**
	* 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, true)) {
	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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