<?php /** * eGroupWare API - Hooks * * @link http://www.egroupware.org * @author Dan Kuykendall <seek3r@phpgroupware.org> * @author Ralf Becker <RalfBecker-AT-outdoor-training.de> * Copyright (C) 2000, 2001 Dan Kuykendall * New method hooks and docu are written by <RalfBecker@outdoor-training.de> * @license http://opensource.org/licenses/lgpl-license.php LGPL - GNU Lesser General Public License * @package api * @version $Id$ */ /** * class which gives ability for applications to set and use hooks to communicate with each other * * Hooks need to be declared in the app's setup.inc.php file and they have to be registered * (copied into the database) by * - installing or updating the app via setup or * - running Admin >> register all hooks * As the hooks-class can get cached in the session (session-type PHP_RESTORE), you also have to log * out and in again, that your changes take effect. * * Hooks can have one of the following formats: * - static class method hooks are declared as: * $setup_info['appname']['hooks']['location'] = 'class::method'; * - method hooks, which are methods of a class. You can pass parameters to the call and * they can return values. They get declared in setup.inc.php as: * $setup_info['appname']['hooks']['location'] = 'app.class.method'; * - old type, which are included files. Values can only be passed by global values and they cant return anything. * Old declaration in setup.inc.php: * $setup_info['appname']['hooks'][] = 'location'; */ class hooks { /** * Reference to the global db object * * @var egw_db */ var $db; var $table = 'egw_hooks'; /** * Hooks by location and appname * * @var array $location => $app => $file */ var $locations; /** * constructor, reads and caches the complete hooks table * * @param egw_db $db=null database class, if null we use $GLOBALS['egw']->db */ function __construct($db=null) { $this->db = $db ? $db : $GLOBALS['egw']->db; // this is to allow setup to set the db // sort hooks by app-order foreach($this->db->select($this->table,'hook_appname,hook_location,hook_filename',false,__LINE__,__FILE__,false,'ORDER BY app_order','phpgwapi',0,'JOIN egw_applications ON hook_appname=app_name') as $row) { $this->locations[$row['hook_location']][$row['hook_appname']] = $row['hook_filename']; } //_debug_array($this->locations); } /** * php4 constructor * * @param egw_db $db * @deprecated use __construct() */ function hooks($db=null) { self::__construct($db); } /** * Executes all the hooks (the user has rights to) for a given location * * If no $order given, hooks are executed in the order of the applications! * * @param string|array $args location-name as string or array with keys location and * further data to be passed to the hook, if its a new method-hook * @param string|array $order appname(s as value), which should be executes first * @param boolean $no_permission_check if True execute all hooks, not only the ones a user has rights to * $no_permission_check should *ONLY* be used when it *HAS* to be. (jengo) * @return array with results of each hook call (with appname as key) and value: * - False if no hook exists (should no longer be the case), * - True if old hook exists and * - whatever the new method-hook returns (can be True or False too!). */ function process($args, $order = array(), $no_permission_check = False) { //echo "<p>".__METHOD__.'('.array2string($args).','.array2string($order).','.array2string($no_permission_check).")</p>\n"; $location = is_array($args) ? $args['location'] : $args; $hooks = $this->locations[$location]; if (!isset($hooks) || empty($hooks)) return array(); // not a single app implements that hook $apps = array_keys($hooks); if (!$no_permission_check) { // on install of a new egroupware both hook-apps and user apps may be empty/not set $apps = array_intersect((array)$apps,array_keys((array)$GLOBALS['egw_info']['user']['apps'])); } if ($order) { $apps = array_unique(array_merge((array)$order,$apps)); } $results = array(); foreach((array)$apps as $appname) { $results[$appname] = $this->single($args,$appname,$no_permission_check); } return $results; } /** * executes a single hook of a given location and application * * @param string|array $args location-name as string or array with keys location, appname and * further data to be passed to the hook, if its a new method-hook * @param string $appname name of the app, which's hook to execute, if empty the current app is used * @param boolean $no_permission_check if True execute all hooks, not only the ones a user has rights to * $no_permission_check should *ONLY* be used when it *HAS* to be. (jengo) * @param boolean $try_unregisterd If true, try to include old file-hook anyway (for setup) * @return mixed False if no hook exists, True if old hook exists and whatever the new method-hook returns (can be True or False too!). */ function single($args, $appname = '', $no_permission_check = False,$try_unregistered = False) { //echo "<p>hooks::single(".array2string($args).",'$appname','$no_permission_check','$try_unregistered')</p>\n"; if (!is_array($args)) $args = array('location' => $args); $location = $args['location']; if (!$appname) { $appname = is_array($args) && isset($args['appname']) ? $args['appname'] : $GLOBALS['egw_info']['flags']['currentapp']; } // excute hook only if $no_permission_check or user has run-rights for app if (!($no_permission_check || isset($GLOBALS['egw_info']['user']['apps'][$appname]))) { return false; } $SEP = filesystem_separator(); /* First include the ordered apps hook file */ if (isset($this->locations[$location][$appname]) || $try_unregistered) { $parts = explode('.',$method = $this->locations[$location][$appname]); if (strpos($method,'::') !== false || count($parts) == 3 && $parts[1] != 'inc' && $parts[2] != 'php') { // new style hook with method string or static method (eg. 'class::method') try { return ExecMethod($method,$args); } catch(egw_exception_assertion_failed $e) { if (substr($e->getMessage(),-19) == '.inc.php not found!') { return false; // fail gracefully if hook class-file does not exists (like the old hooks do, eg. if app got removed) } throw $e; } } // old style hook, with an include file if ($try_unregistered && empty($method)) { $method = 'hook_'.$location.'.inc.php'; } $f = EGW_SERVER_ROOT . $SEP . $appname . $SEP . 'inc' . $SEP . $method; if (file_exists($f) && ( $GLOBALS['egw_info']['user']['apps'][$appname] || (($no_permission_check || $location == 'config' || $appname == 'phpgwapi') && $appname)) ) { include($f); return True; } } return False; } /** * loop through the applications and count the hooks * * @param string $location location-name * @return int the number of found hooks */ function count($location) { return count($this->locations[$location]); } /** * check if a given hook for an application is registered * * @param string $location location-name * @param string $app appname * @return int the number of found hooks */ function hook_exists($location, $app) { //error_log(__METHOD__.__LINE__.array2string($this->locations[$location])); return count($this->locations[$location][$app]); } /** * check which apps implement a given hook * * @param string $location location-name * @return array of apps implementing given hook */ function hook_implemented($location) { //error_log(__METHOD__.__LINE__.array2string($this->locations[$location])); return isset($this->locations[$location]) ? array_keys($this->locations[$location]) : array(); } /** * Register and/or de-register an application's hooks * * First all existing hooks of $appname get deleted in the db and then the given ones get registered. * * @param string $appname Application 'name' * @param array $hooks=null hooks to register, eg $setup_info[$app]['hooks'] or not used for only deregister the hooks * @return boolean|int false on error, true if new hooks are supplied and registed or number of removed hooks */ function register_hooks($appname,$hooks=null) { if(!$appname) { return False; } $this->db->delete($this->table,array('hook_appname' => $appname),__LINE__,__FILE__); if (!is_array($hooks) || !count($hooks)) // only deregister { return $this->db->affected_rows(); } //echo "<p>ADDING hooks for: $appname</p>"; foreach($hooks as $key => $hook) { if (!is_numeric($key)) // new method-hook { $location = $key; $filename = $hook; } else { $location = $hook; $filename = "hook_$hook.inc.php"; } $this->db->insert($this->table,array( 'hook_filename' => $filename, ),array( 'hook_appname' => $appname, 'hook_location' => $location, ),__LINE__,__FILE__); $this->locations[$location][$appname] = $filename; } return True; } /** * Add or/update a single application hook * * setup file of app will be included and the hook required will be added/or updated * * @param string $appname Application 'name' * @param string $location is required, the hook itself * @return boolean|int false on error, true if new hooks are supplied and registed or number of removed hooks */ function register_single_app_hook($appname, $location) { if(!$appname || empty($location)) { return False; } $SEP = filesystem_separator(); // now register the rest again $f = EGW_SERVER_ROOT . $SEP . $appname . $SEP . 'setup' . $SEP . 'setup.inc.php'; $setup_info = array($appname => array()); if(@file_exists($f)) include($f); // some apps have setup_info for more then themselfs (eg. phpgwapi for groupdav) $hdata = array(); foreach($setup_info as $appname => $data) { if ($data['hooks']) { if ($hdata[$appname]) { $hdata[$appname]['hooks'] = array_merge($hdata[$appname]['hooks'],$data['hooks']); } else { $hdata[$appname]['hooks'] = $data['hooks']; } } } //error_log(__METHOD__.__LINE__.array2string($hdata)); foreach((array)$hdata as $appname => $data) { if (array_key_exists($location,$data['hooks'])) $method = $data['hooks'][$location]; } if (!empty($method)) { //echo "<p>ADDING hooks for: $appname</p>"; $this->db->insert($this->table,array( 'hook_appname' => $appname, 'hook_filename' => $method, 'hook_location' => $location, ),array( 'hook_appname' => $appname, 'hook_location' => $location, ),__LINE__,__FILE__); $this->locations[$location][$appname] = $method; return True; } return false; } /** * Register the hooks of all applications (used by admin) */ function register_all_hooks() { // deleting hooks, to get ride of no longer existing apps $this->db->delete($this->table,'1=1',__LINE__,__FILE__); // if we run in setup, we need to read installed apps first if (!$GLOBALS['egw_info']['apps']) { $applications = new applications(); $applications->read_installed_apps(); } // now register all apps using just filesystem data foreach(array_keys($GLOBALS['egw_info']['apps']) as $appname) { if ($appname[0] == '.' || !is_dir(EGW_SERVER_ROOT.'/'.$appname)) continue; $f = EGW_SERVER_ROOT . '/' . $appname . '/setup/setup.inc.php'; $setup_info = array($appname => array()); if(@file_exists($f)) include($f); // some apps have setup_info for more then themselfs (eg. phpgwapi for groupdav) $hdata = array(); foreach($setup_info as $appname => $data) { if ($data['hooks']) { if ($hdata[$appname]) { $hdata[$appname]['hooks'] = array_merge($hdata[$appname]['hooks'],$data['hooks']); } else { $hdata[$appname]['hooks'] = $data['hooks']; } } } foreach((array)$hdata as $appname => $data) { if ($data['hooks']) $this->register_hooks($appname,$data['hooks']); } } } }