mirror of
https://github.com/EGroupware/egroupware.git
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287 lines
9.5 KiB
PHP
287 lines
9.5 KiB
PHP
<?php
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/**************************************************************************\
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* eGroupWare API - Hooks *
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* This file written by Dan Kuykendall <seek3r@phpgroupware.org> *
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* Allows applications to "hook" into each other *
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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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* -------------------------------------------------------------------------*
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* This library is part of the eGroupWare API *
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* http://www.egroupware.org/api *
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* ------------------------------------------------------------------------ *
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* This library is free software; you can redistribute it and/or modify it *
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* under the terms of the GNU Lesser General Public License as published by *
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* the Free Software Foundation; either version 2.1 of the License, *
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* or any later version. *
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* This library is distributed in the hope that it will be useful, but *
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* WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. *
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* See the GNU Lesser General Public License for more details. *
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* You should have received a copy of the GNU Lesser General Public License *
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* along with this library; if not, write to the Free Software Foundation, *
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* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA *
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\**************************************************************************/
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/* $Id$ */
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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 either have two formats
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* - new method hooks (prefered), 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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* @author Dan Kuykendall
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* @author Ralf Becker <RalfBecker@outdoor-training.de> new method hooks
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* @license LGPL
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* @package phpgwapi
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* @access public
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*/
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class hooks
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{
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var $found_hooks = Array();
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var $db;
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var $table = 'egw_hooks';
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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 object $db=null database class, if null we use $GLOBALS['egw']->db
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*/
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function hooks($db=null)
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{
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$this->db = $db ? $db : $GLOBALS['egw']->db; // this is to allow setup to set the db
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$this->db->select($this->table,'hook_appname,hook_location,hook_filename',false,__LINE__,__FILE__);
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while( $this->db->next_record() )
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{
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$this->found_hooks[$this->db->f('hook_appname')][$this->db->f('hook_location')] = $this->db->f('hook_filename');
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}
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//echo '<pre>';
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//print_r($this->found_hooks);
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//echo '</pre>';
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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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* @param string/array $args location-name as string or array with keys location, order and
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* further data to be passed to the hook, if its a new method-hook
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* @param array $order appnames (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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* $no_permission_check should *ONLY* be used when it *HAS* to be. (jengo)
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* @return array with results of each hook call (with appname as key) and value:
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* - False if no hook exists,
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* - True if old hook exists and
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* - whatever the new method-hook returns (can be True or False too!).
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*/
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function process($args, $order = '', $no_permission_check = False)
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{
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//echo "<p>hooks::process("; print_r($args); echo ")</p>\n";
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if ($order == '')
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{
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$order = is_array($args) && isset($args['order']) ? $args['order'] :
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array($GLOBALS['egw_info']['flags']['currentapp']);
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}
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/* First include the ordered apps hook file */
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foreach($order as $appname)
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{
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$results[$appname] = $this->single($args,$appname,$no_permission_check);
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if (!isset($results[$appname])) // happens if the method hook has no return-value
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{
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$results[$appname] = False;
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}
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}
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/* Then add the rest */
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if ($no_permission_check)
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{
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$apps = $GLOBALS['egw_info']['apps'];
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}
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else
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{
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$apps = $GLOBALS['egw_info']['user']['apps'];
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}
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settype($apps,'array');
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foreach($apps as $app)
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{
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$appname = $app['name'];
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if (!isset($results[$appname]))
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{
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$results[$appname] = $this->single($args,$appname,$no_permission_check);
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}
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}
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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("; print_r($args); echo ",'$appname','$no_permission_check','$try_unregistered')</p>\n";
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if (is_array($args))
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{
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$location = $args['location'];
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}
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else
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{
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$location = $args;
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}
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if (!$appname)
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{
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$appname = is_array($args) && isset($args['appname']) ? $args['appname'] : $GLOBALS['egw_info']['flags']['currentapp'];
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}
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$SEP = filesystem_separator();
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/* First include the ordered apps hook file */
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if (isset($this->found_hooks[$appname][$location]) || $try_unregistered)
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{
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$parts = explode('.',$method = $this->found_hooks[$appname][$location]);
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if (count($parts) != 3 || ($parts[1] == 'inc' && $parts[2] == 'php'))
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{
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if ($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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else
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{
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return False;
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}
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}
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else // new style method-hook
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{
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return ExecMethod($method,$args);
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}
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}
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else
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{
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return False;
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}
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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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$count = 0;
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foreach($GLOBALS['egw_info']['user']['apps'] as $appname => $data)
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{
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if (isset($this->found_hooks[$appname][$location]))
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{
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++$count;
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}
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}
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return $count;
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}
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/**
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* @deprecated currently not being used
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*/
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function read()
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{
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//if (!is_array($this->found_hooks))
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//{
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$this->hooks();
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//}
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return $this->found_hooks;
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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 false on error, true otherwise
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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 True;
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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' => $location,
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),__LINE__,__FILE__);
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}
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return True;
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}
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/**
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* Register the hooks of all applications (used by admin)
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*/
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function register_all_hooks()
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{
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$SEP = filesystem_separator();
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foreach($GLOBALS['egw_info']['apps'] as $appname => $app)
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{
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$f = EGW_SERVER_ROOT . $SEP . $appname . $SEP . 'setup' . $SEP . 'setup.inc.php';
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if(@file_exists($f))
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{
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include($f);
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$this->register_hooks($appname,$setup_info[$appname]['hooks']);
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}
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}
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}
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}
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