egroupware/phpgwapi/inc/class.hooks.inc.php

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<?php
/**************************************************************************\
* phpGroupWare API - Hooks *
* This file written by Dan Kuykendall <seek3r@phpgroupware.org> *
* Allows applications to "hook" into each other *
* Copyright (C) 2000, 2001 Dan Kuykendall *
* -------------------------------------------------------------------------*
* This library is part of the phpGroupWare API *
* http://www.phpgroupware.org/api *
* ------------------------------------------------------------------------ *
* This library is free software; you can redistribute it and/or modify it *
* under the terms of the GNU Lesser General Public License as published by *
* the Free Software Foundation; either version 2.1 of the License, *
* or any later version. *
* This library is distributed in the hope that it will be useful, but *
* WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. *
* See the GNU Lesser General Public License for more details. *
* You should have received a copy of the GNU Lesser General Public License *
* along with this library; if not, write to the Free Software Foundation, *
* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA *
\**************************************************************************/
/* $Id$ */
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/*!
@class hooks
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@abstract class which gives ability for applications to set and use hooks to communicate with each other
@author Dan Kuykendall
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@copyright LGPL
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@package phpgwapi
@access public
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*/
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class hooks
{
var $found_hooks = Array();
var $db = '';
function hooks($db='')
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{
$this->db = $db ? $db : $GLOBALS['phpgw']->db; // this is to allow setup to set the db
$this->db->query("SELECT hook_appname, hook_location, hook_filename FROM phpgw_hooks",__LINE__,__FILE__);
while( $this->db->next_record() )
{
$this->found_hooks[$this->db->f('hook_appname')][$this->db->f('hook_location')] = $this->db->f('hook_filename');
}
//echo '<pre>';
//print_r($this->found_hooks);
//echo '</pre>';
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}
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/*!
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@function process
@abstract executes all the hooks (the user has rights to) for a given location
@syntax process($args,$order='',$no_permission_check = False)
@param $args location-name as string or array:
@param $args['location'] location-name
@param $order or $args['order'] array of appnames (as value), which should be executes first
@param $args is passed to the hook, if its a new method-hook
@param $no_permission_check if True execute all hooks, not only the ones a user has rights to
@note $no_permission_check should *ONLY* be used when it *HAS* to be. (jengo)
@returns array with results of each hook call (with appname as key): \
False if no hook exists, True if old hook exists \
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and whatever the new method-hook returns (can be True or False too!).
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*/
function process($args, $order = '', $no_permission_check = False)
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{
//echo "<p>hooks::process("; print_r($args); echo ")</p>\n";
if ($order == '')
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{
$order = is_array($args) && isset($args['order']) ? $args['order'] :
array($GLOBALS['phpgw_info']['flags']['currentapp']);
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}
/* First include the ordered apps hook file */
foreach($order as $appname)
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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
{
$results[$appname] = False;
}
}
/* Then add the rest */
if ($no_permission_check)
{
$apps = $GLOBALS['phpgw_info']['apps'];
}
else
{
$apps = $GLOBALS['phpgw_info']['user']['apps'];
}
settype($apps,'array');
foreach($apps as $app)
{
$appname = $app['name'];
if (!isset($results[$appname]))
{
$results[$appname] = $this->single($args,$appname,$no_permission_check);
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}
}
return $results;
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}
/*!
@function single
@abstract executes a single hook of a given location and application
@syntax single($args,$appname='',$no_permission_check = False)
@param $args location-name as string or array:
@param $args['location'] location-name
@param $appname or $args['appname'] name of the app, which's hook to execute, if empty the current app is used
@param $args is passed to the hook, if its a new method-hook
@param $no_permission_check if True execute all hooks, not only the ones a user has rights to
@param $try_unregisterd If true, try to include old file-hook anyway (for setup)
@note $no_permission_check should *ONLY* be used when it *HAS* to be. (jengo)
@returns False if no hook exists, True if an old hook exist and whatever the new method-hook returns
*/
function single($args, $appname = '', $no_permission_check = False,$try_unregistered = False)
{
//echo "<p>hooks::single("; print_r($args); echo ",'$appname','$no_permission_check','$try_unregistered')</p>\n";
if (is_array($args))
{
$location = $args['location'];
}
else
{
$location = $args;
}
if (!$appname)
{
$appname = is_array($args) && isset($args['appname']) ? $args['appname'] : $GLOBALS['phpgw_info']['flags']['currentapp'];
}
$SEP = filesystem_separator();
/* First include the ordered apps hook file */
if (isset($this->found_hooks[$appname][$location]) || $try_unregistered)
{
$parts = explode('.',$method = $this->found_hooks[$appname][$location]);
if (count($parts) != 3 || ($parts[1] == 'inc' && $parts[2] == 'php'))
{
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if ($try_unregistered && empty($method))
{
$method = 'hook_'.$location.'.inc.php';
}
$f = PHPGW_SERVER_ROOT . $SEP . $appname . $SEP . 'inc' . $SEP . $method;
if (file_exists($f) &&
( $GLOBALS['phpgw_info']['user']['apps'][$appname] || (($no_permission_check || $location == 'config' || $appname == 'phpgwapi') && $appname)) )
{
include($f);
return True;
}
else
{
return False;
}
}
else // new style method-hook
{
return ExecMethod($method,$args);
}
}
else
{
return False;
}
}
/*!
@function count
@abstract loop through the applications and count the hooks
*/
function count($location)
{
$count = 0;
foreach($GLOBALS['phpgw_info']['user']['apps'] as $appname => $data)
{
if (isset($this->found_hooks[$appname][$location]))
{
++$count;
}
}
return $count;
}
/*!
@function read()
@abstract currently not being used
*/
function read()
{
//if (!is_array($this->found_hooks))
//{
$this->hooks();
//}
return $this->found_hooks;
}
/*!
@function register_hooks
@abstract Register and/or de-register an application's hooks
@syntax register_hooks($appname,$hooks='')
@param $appname Application 'name'
@param $hooks array with hooks to register, eg $setup_info[$app]['hooks'] or not used for only deregister the hooks
*/
function register_hooks($appname,$hooks='')
{
if(!$appname)
{
return False;
}
$db_appname = $this->db->db_addslashes($appname);
$this->db->query("DELETE FROM phpgw_hooks WHERE hook_appname='$db_appname'",__LINE__,__FILE__);
if (!is_array($hooks)) // only deregister
{
return True;
}
//echo "<p>ADDING hooks for: $appname</p>";
foreach($hooks as $key => $hook)
{
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if (!is_numeric($key)) // new method-hook
{
$location = $key;
$filename = $hook;
}
else
{
$location = $hook;
$filename = "hook_$hook.inc.php";
}
$this->db->query("INSERT INTO phpgw_hooks (hook_appname,hook_location,hook_filename)".
" VALUES ('$appname','$location','$filename');");
}
return True;
}
/*!
@function register_all_hooks
@abstract Register the hooks of all applications (used by admin)
*/
function register_all_hooks()
{
$SEP = filesystem_separator();
foreach($GLOBALS['phpgw_info']['apps'] as $appname => $app)
{
$f = PHPGW_SERVER_ROOT . $SEP . $appname . $SEP . 'setup' . $SEP . 'setup.inc.php';
if(@file_exists($f))
{
include($f);
$this->register_hooks($appname,$setup_info[$appname]['hooks']);
}
}
}
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}
?>