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