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) 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 loaded 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;

	/** @var string */
	public $dir;
	/** @var string */
	public $url = 'plugins/';
	/** @var string */
	public $task = '';
	/** @var bool */
	public $initialized = false;

	public $output;
	public $handlers = [];
	public $allowed_prefs = [];
	public $allowed_session_prefs = [];
	public $active_plugins = [];

	protected $plugins = [];
	protected $plugins_initialized = [];
	protected $tasks = [];
	protected $actions = [];
	protected $actionmap = [];
	protected $objectsmap = [];
	protected $template_contents = [];
	protected $exec_stack = [];
	protected $deprecated_hooks = [];


	/**
	* 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 rcube $app Instance of the rcube base class
	* @param string $task Current application task (used for conditional plugin loading)
	*/
	public function init($app, $task = '')
	{
	$this->task = $task;
	$this->output = $app->output;

	// register an internal hook
	$this->register_hook('template_container', [$this, 'template_container_hook']);
	// maybe also register a shutdown function which triggers
	// shutdown functions of all plugin objects

	foreach ($this->plugins as $plugin) {
	// ... task, request type and framed mode
	if (empty($this->plugins_initialized[$plugin->ID]) && !$this->filter($plugin)) {
	$plugin->init();
	$this->plugins_initialized[$plugin->ID] = $plugin;
	}
	}

	// we have finished initializing all plugins
	$this->initialized = true;
	}

	/**
	* 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 $plugins_enabled List of configured plugins to load
	* @param array $plugins_required List of plugins required by the application
	*/
	public function load_plugins($plugins_enabled, $plugins_required = [])
	{
	foreach ($plugins_enabled as $plugin_name) {
	$this->load_plugin($plugin_name);
	}

	// check existence of all required core plugins
	foreach ($plugins_required 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([
	'code' => 520, 'file' => __FILE__, 'line' => __LINE__,
	'message' => "Required plugin $plugin_name was not loaded"
	],
	true, true
	);
	}
	}
	}

	/**
	* Load the specified plugin
	*
	* @param string $plugin_name Plugin name
	* @param bool $force Force loading of the plugin even if it doesn't match the filter
	* @param bool $require Require loading of the plugin, error if it doesn't exist
	*
	* @return bool True on success, false if not loaded or failure
	*/
	public function load_plugin($plugin_name, $force = false, $require = true)
	{
	static $plugins_dir;

	if (!$plugins_dir) {
	$dir = dir($this->dir);
	$plugins_dir = unslashify($dir->path);
	}

	// Validate the plugin name to prevent from path traversal
	if (preg_match('/[^a-zA-Z0-9_-]/', $plugin_name)) {
	rcube::raise_error([
	'code' => 520, 'file' => __FILE__, 'line' => __LINE__,
	'message' => "Invalid plugin name: $plugin_name"
	],
	true, false
	);

	return false;
	}

	// plugin already loaded?
	if (!isset($this->plugins[$plugin_name])) {
	$fn = "$plugins_dir/$plugin_name/$plugin_name.php";

	if (!is_readable($fn)) {
	if ($require) {
	rcube::raise_error([
	'code' => 520, 'file' => __FILE__, 'line' => __LINE__,
	'message' => "Failed to load plugin file $fn"
	],
	true, false
	);
	}

	return false;
	}

	if (!class_exists($plugin_name, false)) {
	include $fn;
	}

	// instantiate class if exists
	if (!class_exists($plugin_name, false)) {
	rcube::raise_error([
	'code' => 520, 'file' => __FILE__, 'line' => __LINE__,
	'message' => "No plugin class $plugin_name found in $fn"
	],
	true, false
	);

	return false;
	}

	$plugin = new $plugin_name($this);
	$this->active_plugins[] = $plugin_name;

	// check inheritance...
	if (is_subclass_of($plugin, 'rcube_plugin')) {
	// call onload method on plugin if it exists.
	// this is useful if you want to be called early in the boot process
	if (method_exists($plugin, 'onload')) {
	$plugin->onload();
	}

	if (!empty($plugin->allowed_prefs)) {
	$this->allowed_prefs = array_merge($this->allowed_prefs, $plugin->allowed_prefs);
	}

	$this->plugins[$plugin_name] = $plugin;
	}
	}

	if (!empty($this->plugins[$plugin_name])) {
	$plugin = $this->plugins[$plugin_name];

	// init a plugin only if $force is set or if we're called after initialization
	if (
	($force \|\| $this->initialized)
	&& empty($this->plugins_initialized[$plugin_name])
	&& ($force \|\| !$this->filter($plugin))
	) {
	$plugin->init();
	$this->plugins_initialized[$plugin_name] = $plugin;
	}
	}

	return true;
	}

	/**
	* Check if we should prevent this plugin from initializing
	*
	* @param rcube_plugin $plugin Plugin object
	*
	* @return bool
	*/
	private function filter($plugin)
	{
	return ($plugin->noajax && !(is_object($this->output) && $this->output->type == 'html'))
	\|\| ($plugin->task && !preg_match('/^('.$plugin->task.')$/i', $this->task))
	\|\| ($plugin->noframe && !empty($_REQUEST['_framed']));
	}

	/**
	* Get information about a specific plugin.
	* This is either provided by a plugin's info() method or extracted from a package.xml or a composer.json file
	*
	* @param string $plugin_name Plugin name
	*
	* @return array Meta information about a plugin or False if plugin was not found
	*/
	public function get_info($plugin_name)
	{
	static $composer_lock, $license_uris = [
	'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',
	'GPL-2.0' => 'http://www.gnu.org/licenses/gpl-2.0.html',
	'GPL-2.0+' => 'http://www.gnu.org/licenses/gpl.html',
	'GPL-3.0' => 'http://www.gnu.org/licenses/gpl-3.0.html',
	'GPL-3.0+' => 'http://www.gnu.org/licenses/gpl.html',
	'AGPL-3.0' => 'http://www.gnu.org/licenses/agpl.html',
	'AGPL-3.0+' => 'http://www.gnu.org/licenses/agpl.html',
	'LGPL' => '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) . "/$plugin_name/$plugin_name.php";
	$info = false;

	// Validate the plugin name to prevent from path traversal
	if (preg_match('/[^a-zA-Z0-9_-]/', $plugin_name)) {
	rcube::raise_error([
	'code' => 520, 'file' => __FILE__, 'line' => __LINE__,
	'message' => "Invalid plugin name: $plugin_name"
	],
	true, false
	);

	return false;
	}

	if (!class_exists($plugin_name, false)) {
	if (is_readable($fn)) {
	include($fn);
	}
	else {
	return false;
	}
	}

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

	// fall back to composer.json file
	if (empty($info)) {
	$info = [];
	$composer = INSTALL_PATH . "/plugins/$plugin_name/composer.json";

	if (is_readable($composer) && ($json = json_decode(file_get_contents($composer), true))) {
	// Build list of plugins required
	$require = [];
	foreach (array_keys((array) $json['require']) as $dname) {
	if (!preg_match('\|^([^/]+)/([a-zA-Z0-9_-]+)$\|', $dname, $m)) {
	continue;
	}

	$vendor = $m[1];
	$name = $m[2];

	if ($name != 'plugin-installer' && $vendor != 'pear' && $vendor != 'pear-pear') {
	$dpath = unslashify($dir->path) . "/$name/$name.php";
	if (is_readable($dpath)) {
	$require[] = $name;
	}
	}
	}

	if (!empty($json['name']) && is_string($json['name']) && strpos($json['name'], '/') !== false) {
	list($info['vendor'], $info['name']) = explode('/', $json['name'], 2);
	}

	$info['version'] = isset($json['version']) ? $json['version'] : null;
	$info['license'] = isset($json['license']) ? $json['license'] : null;
	$info['require'] = $require;

	if (!empty($json['homepage'])) {
	$info['uri'] = $json['homepage'];
	}
	}

	// 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 && !empty($composer_lock['packages'])) {
	foreach ($composer_lock['packages'] as $i => $package) {
	$composer_lock['installed'][$package['name']] = $package;
	}
	}
	}

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

	// fall back to package.xml file
	if (empty($info)) {
	$package = INSTALL_PATH . "/plugins/$plugin_name/package.xml";
	if (is_readable($package) && ($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 = [
	'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['require'][] = $dn;
	}
	}
	}

	// At least provide the name
	if (!$info && class_exists($plugin_name)) {
	$info = ['name' => $plugin_name, 'version' => '--'];
	}
	else if (!empty($info['license'])) {
	// Convert license identifier to something shorter
	if (preg_match('/^([ALGP]+)[-v]([0-9.]+)(\+\|-or-later)?/', $info['license'], $matches)) {
	$info['license'] = $matches[1] . '-' . sprintf('%.1f', $matches[2])
	. (!empty($matches[3]) ? '+' : '');
	}

	if (empty($info['license_uri']) && !empty($license_uris[$info['license']])) {
	$info['license_uri'] = $license_uris[$info['license']];
	}
	}

	return $info;
	}

	/**
	* Allows a plugin object to register a callback for a certain hook
	*
	* @param string $hook Hook name
	* @param callback $callback A callback function
	*/
	public function register_hook($hook, $callback)
	{
	if (is_callable($callback)) {
	if (isset($this->deprecated_hooks[$hook])) {
	rcube::raise_error([
	'code' => 522, '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([
	'code' => 521, '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 callback $callback A callback function
	*/
	public function unregister_hook($hook, $callback)
	{
	if (empty($this->handlers[$hook])) {
	return;
	}

	$callback_id = array_search($callback, (array) $this->handlers[$hook]);
	if ($callback_id !== false) {
	// array_splice() removes the element and re-indexes keys
	// that is required by the 'for' loop in exec_hook() below
	array_splice($this->handlers[$hook], $callback_id, 1);
	}
	}

	/**
	* 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, $args = [])
	{
	if (!is_array($args)) {
	$args = ['arg' => $args];
	}

	// TODO: avoid recursion by checking in_array($hook, $this->exec_stack) ?

	$args += ['abort' => false];
	array_push($this->exec_stack, $hook);

	// Use for loop here, so handlers added in the hook will be executed too
	if (!empty($this->handlers[$hook])) {
	for ($i = 0; $i < count($this->handlers[$hook]); $i++) {
	$ret = call_user_func($this->handlers[$hook][$i], $args);
	if ($ret && is_array($ret)) {
	$args = $ret + $args;
	}

	if (!empty($args['break'])) {
	break;
	}
	}
	}

	array_pop($this->exec_stack);
	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 callback $callback A callback function
	* @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([
	'code' => 523, '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([
	'code' => 524, '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 callback $callback A callback function
	*/
	public function register_handler($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([
	'code' => 525, '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([
	'code' => 526, '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([
	'code' => 526, 'file' => __FILE__, 'line' => __LINE__,
	'message' => "Cannot register task $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 $task Task name
	*
	* @return bool True if registered, otherwise false
	*/
	public function is_plugin_task($task)
	{
	return !empty($this->tasks[$task]);
	}

	/**
	* Check if a plugin hook is currently processing.
	* Mainly used to prevent loops and recursion.
	*
	* @param string $hook Hook to check (optional)
	*
	* @return bool True if any/the given hook is currently processed, otherwise false
	*/
	public function is_processing($hook = null)
	{
	return count($this->exec_stack) > 0 && (!$hook \|\| in_array($hook, $this->exec_stack));
	}

	/**
	* 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);
	$this->output->include_script($src, 'head_bottom', false);
	}
	}

	/**
	* 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) && $this->output->type == 'html') {
	if ($fn[0] != '/' && !preg_match('\|^https?://\|i', $fn)) {
	$rcube = rcube::get_instance();
	$devel_mode = $rcube->config->get('devel_mode');
	$assets_dir = $rcube->config->get('assets_dir');
	$path = unslashify($assets_dir ?: RCUBE_INSTALL_PATH);
	$dir = $path . (strpos($fn, "plugins/") === false ? '/plugins' : '');

	// Prefer .less files in devel_mode (assume less.js is loaded)
	if ($devel_mode) {
	$less = preg_replace('/\.css$/i', '.less', $fn);
	if ($less != $fn && is_file("$dir/$less")) {
	$fn = $less;
	}
	}
	else if (!preg_match('/\.min\.css$/', $fn)) {
	$min = preg_replace('/\.css$/i', '.min.css', $fn);
	if (is_file("$dir/$min")) {
	$fn = $min;
	}
	}

	if (!is_file("$dir/$fn")) {
	return;
	}
	}

	$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, $container)
	{
	if (!isset($this->template_contents[$container])) {
	$this->template_contents[$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);
	}

	/**
	* Returns loaded plugin
	*
	* @return rcube_plugin\|null Plugin instance
	*/
	public function get_plugin($name)
	{
	return !empty($this->plugins[$name]) ? $this->plugins[$name] : null;
	}

	/**
	* Callback for template_container hooks
	*
	* @param array $attrib Container attributes
	*
	* @return array
	*/
	protected function template_container_hook($attrib)
	{
	$container = $attrib['name'];
	$content = $attrib['content'] ?? '';

	if (isset($this->template_contents[$container])) {
	$content .= $this->template_contents[$container];
	}

	return ['content' => $content];
	}

	/**
	* Make the given file name link into the plugins directory
	*
	* @param string $fn Filename
	*
	* @return string
	*/
	protected function resource_url($fn)
	{
	// pattern "skins/" used to identify plugin resources loaded from the core skin folder
	if ($fn[0] != '/' && !preg_match('#^(https?://\|skins/)#i', $fn)) {
	return $this->url . $fn;
	}
	else {
	return $fn;
	}
	}
	}

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