diff options
Diffstat (limited to 'program/lib/Roundcube/rcube_plugin_api.php')
| -rw-r--r-- | program/lib/Roundcube/rcube_plugin_api.php | 495 |
1 files changed, 495 insertions, 0 deletions
diff --git a/program/lib/Roundcube/rcube_plugin_api.php b/program/lib/Roundcube/rcube_plugin_api.php new file mode 100644 index 000000000..51daf2797 --- /dev/null +++ b/program/lib/Roundcube/rcube_plugin_api.php @@ -0,0 +1,495 @@ +<?php + +/* + +-----------------------------------------------------------------------+ + | program/include/rcube_plugin_api.php | + | | + | This file is part of the Roundcube Webmail client | + | Copyright (C) 2008-2011, 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('RCMAIL_PLUGINS_DIR')) + define('RCMAIL_PLUGINS_DIR', 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(); + 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 $deprecated_hooks = array( + 'create_user' => 'user_create', + 'kill_session' => 'session_destroy', + 'upload_attachment' => 'attachment_upload', + 'save_attachment' => 'attachment_save', + 'get_attachment' => 'attachment_get', + 'cleanup_attachments' => 'attachments_cleanup', + 'display_attachment' => 'attachment_display', + 'remove_attachment' => 'attachment_delete', + 'outgoing_message_headers' => 'message_outgoing_headers', + 'outgoing_message_body' => 'message_outgoing_body', + 'address_sources' => 'addressbooks_list', + 'get_address_book' => 'addressbook_get', + 'create_contact' => 'contact_create', + 'save_contact' => 'contact_update', + 'contact_save' => 'contact_update', + 'delete_contact' => 'contact_delete', + 'manage_folders' => 'folders_list', + 'list_mailboxes' => 'mailboxes_list', + 'save_preferences' => 'preferences_save', + 'user_preferences' => 'preferences_list', + 'list_prefs_sections' => 'preferences_sections_list', + 'list_identities' => 'identities_list', + 'create_identity' => 'identity_create', + 'delete_identity' => 'identity_delete', + 'save_identity' => 'identity_update', + 'identity_save' => 'identity_update', + // to be removed after 0.8 + 'imap_init' => 'storage_init', + 'mailboxes_list' => 'storage_folders', + ); + + /** + * This implements the 'singleton' design pattern + * + * @return rcube_plugin_api The one and only instance if this class + */ + static function get_instance() + { + if (!self::$instance) { + self::$instance = new rcube_plugin_api(); + } + + return self::$instance; + } + + + /** + * Private constructor + */ + protected function __construct() + { + $this->dir = slashify(RCMAIL_PLUGINS_DIR); + } + + + /** + * Initialize plugin engine + * + * This has to be done after rcmail::load_gui() or rcmail::json_init() + * was called because plugins need to have access to rcmail->output + * + * @param object rcube Instance of the rcube base class + * @param string Current application task (used for conditional plugin loading) + */ + public function init($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; + } + 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, $owner) + { + if ($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; + } + +} |