chamilo-lms/main/admin/settings.php

<?php // $Id: settings.php 16878 2008-11-23 00:04:52Z herodoto $
/*
==============================================================================
	Dokeos - elearning and course management software

	Copyright (c) 2004-2008 Dokeos SPRL
	Copyright (c) 2003 Ghent University
	Copyright (c) Patrick Cool, Ghent University
	Copyright (c) Julio Montoya, Dokeos
	Copyright (c) Roan Embrechts, Vrije Universiteit Brussel
	Copyright (c) Bart Mollet, Hogeschool Gent

	For a full list of contributors, see "credits.txt".
	The full license can be read in "license.txt".

	This program is free software; you can redistribute it and/or
	modify it under the terms of the GNU General Public License
	as published by the Free Software Foundation; either version 2
	of the License, or (at your option) any later version.

	See the GNU General Public License for more details.

	Contact address: Dokeos, rue du Corbeau, 108, B-1030 Brussels, Belgium
	Mail: info@dokeos.com
==============================================================================
*/
/**
==============================================================================
* With this tool you can easily adjust non critical configuration settings.
* Non critical means that changing them will not result in a broken campus.
*
* @author Patrick Cool
* @since Dokeos 1.6
* @author Julio Montoya - Multiple URL site
* @package dokeos.admin
==============================================================================
*/

/*
==============================================================================
		INIT SECTION
==============================================================================
*/
// name of the language file that needs to be included
$language_file = 'admin';
// resetting the course id
$cidReset=true;
// including some necessary dokeos files
include_once ('../inc/global.inc.php');
require_once (api_get_path(LIBRARY_PATH).'formvalidator/FormValidator.class.php');
require_once (api_get_path(LIBRARY_PATH).'fileManage.lib.php');
require_once (api_get_path(LIBRARY_PATH).'fileUpload.lib.php');

// setting the section (for the tabs)
$this_section = SECTION_PLATFORM_ADMIN;

// Access restrictions
api_protect_admin_script();

// Submit Stylesheets
if (!empty($_POST['submit_stylesheets']))
{
	$message = store_stylesheets();
	header("Location: ".api_get_self()."?category=stylesheets");
	exit;
}

// Database Table Definitions
$table_settings_current = Database :: get_main_table(TABLE_MAIN_SETTINGS_CURRENT);

// setting breadcrumbs
$interbreadcrumb[] = array ("url" => 'index.php', "name" => get_lang('PlatformAdmin'));

// setting the name of the tool
$tool_name = get_lang('DokeosConfigSettings');

// Build the form
if (!empty($_GET['category']) and $_GET['category'] <> "Plugins" and $_GET['category'] <> "stylesheets")
{
	$form = new FormValidator('settings', 'post', 'settings.php?category='.$_GET['category']);
	$renderer = & $form->defaultRenderer();
	$renderer->setHeaderTemplate('<div class="sectiontitle">{header}</div>'."\n");
	$renderer->setElementTemplate('<div class="sectioncomment">{label}</div>'."\n".'<div class="sectionvalue">{element}</div>'."\n");
	$my_category = mysql_real_escape_string($_GET['category']);
	
	if ($_configuration['access_url']==1)
	{
		$settings = api_get_settings($my_category,'group',$_configuration['access_url']);
	}
	else
	{
		$url_info = api_get_access_url($_configuration['access_url']);
		if ($url_info['active']==1)
		{
			//the default settings of Dokeos
			$settings = api_get_settings($my_category,'group',1,0);		
			//the settings that are changeable from a particular site 
			$settings_by_access = api_get_settings($my_category,'group',$_configuration['access_url'],1);			
			//echo '<pre>';
			//print_r($settings_by_access);
			$settings_by_access_list=array();
			foreach($settings_by_access as $row)
			{
				if (empty($row['variable']))
					$row['variable']=0;
				if (empty($row['subkey']))
					$row['subkey']=0;
				if (empty($row['category']))
					$row['category']=0;
				// one more validation if is changeable
				if ($row['access_url_changeable']==1)
					$settings_by_access_list[ $row['variable'] ] [ $row['subkey'] ]	[ $row['category'] ]  = $row;
				else
					$settings_by_access_list[ $row['variable'] ] [ $row['subkey'] ]	[ $row['category'] ]  = array();
			}	
		}
	}

	//print_r($settings_by_access_list);echo '</pre>';
	//$sqlsettings = "SELECT DISTINCT * FROM $table_settings_current WHERE category='$my_category' GROUP BY variable ORDER BY id ASC";
	//$resultsettings = api_sql_query($sqlsettings, __FILE__, __LINE__);
	//while ($row = mysql_fetch_array($resultsettings))
	$default_values = array();
	foreach($settings as $row)
	{
		$form->addElement('header', null, get_lang($row['title']));
		$hideme=array();
		$hide_element=false;
		if ($_configuration['access_url']!=1)
		{
			if ($row['access_url_changeable']==0)
			{
				//we hide the element in other cases (checkbox, radiobutton) we 'freeze' the element
				$hide_element=true;
				$hideme=array('disabled');
			}
			elseif($url_info['active']==1)
			{
				// we show the elements 
				if (empty($row['variable']))
					$row['variable']=0;
				if (empty($row['subkey']))
					$row['subkey']=0;
				if (empty($row['category']))
					$row['category']=0;
					
				if (is_array ($settings_by_access_list[ $row['variable'] ] [ $row['subkey'] ]	[ $row['category'] ]))
				{
					// we are sure that the other site have a selected value 
					if ($settings_by_access_list[ $row['variable'] ] [ $row['subkey'] ]	[ $row['category'] ]['selected_value']!='')											
						$row['selected_value']	=$settings_by_access_list[$row['variable']] [$row['subkey']]	[ $row['category'] ]['selected_value'];
				}
				// there is no else because we load the default $row['selected_value'] of the main Dokeos site
			}	
		}	
				
		switch ($row['type'])
		{
			case 'textfield' :						
				$form->addElement('text', $row['variable'], get_lang($row['comment']),$hideme);
				$default_values[$row['variable']] = $row['selected_value'];
				break;
			case 'textarea' :
				$form->addElement('textarea', $row['variable'], get_lang($row['comment']),$hideme);
				$default_values[$row['variable']] = $row['selected_value'];
				break;
			case 'radio' :
				$values = get_settings_options($row['variable']);
				$group = array ();
				foreach ($values as $key => $value)
				{
					$element = & $form->createElement('radio', $row['variable'], '', get_lang($value['display_text']), $value['value']);
					if ($hide_element)
						$element->freeze();
					$group[] = $element; 
				}
				
				$form->addGroup($group, $row['variable'], get_lang($row['comment']), '<br />', false);
				$default_values[$row['variable']] = $row['selected_value'];
				break;
			case 'checkbox';
				$sql = "SELECT * FROM settings_current WHERE variable='".$row['variable']."'";
				$result = api_sql_query($sql, __FILE__, __LINE__);
				$group = array ();	
				while ($rowkeys = mysql_fetch_array($result))
				{
					$element = & $form->createElement('checkbox', $rowkeys['subkey'], '', get_lang($rowkeys['subkeytext']));
					if ($rowkeys['selected_value'] == 'true' && ! $form->isSubmitted())
					{
						$element->setChecked(true); 
					}
					if ($hide_element)
						$element->freeze();
					$group[] = $element;
				}
				$form->addGroup($group, $row['variable'], get_lang($row['comment']), '<br />'."\n");
				break;
			case "link" :
				$form->addElement('static', null, get_lang($row['comment']), get_lang('CurrentValue').' : '.$row['selected_value'],$hideme);
		}
	}
	$form->addElement('submit', null, get_lang('Ok'));
	$form->setDefaults($default_values);
	if ($form->validate())
	{
		$values = $form->exportValues();
		// the first step is to set all the variables that have type=checkbox of the category
		// to false as the checkbox that is unchecked is not in the $_POST data and can
		// therefore not be set to false.
		// This, however, also means that if the process breaks on the third of five checkboxes, the others
		// will be set to false.
		$r = api_set_settings_category($my_category,'false',$_configuration['access_url']);
		//$sql = "UPDATE $table_settings_current SET selected_value='false' WHERE category='$my_category' AND type='checkbox'";
		//$result = api_sql_query($sql, __FILE__, __LINE__);
		// Save the settings
		foreach ($values as $key => $value)
		{
			if (!is_array($value))
			{
				//$sql = "UPDATE $table_settings_current SET selected_value='".mysql_real_escape_string($value)."' WHERE variable='$key'";
				//$result = api_sql_query($sql, __FILE__, __LINE__);
				$result = api_set_setting($key,$value,null,null,$_configuration['access_url']);
			}
			else
			{
				foreach ($value as $subkey => $subvalue)
				{
					//$sql = "UPDATE $table_settings_current SET selected_value='true' WHERE variable='$key' AND subkey = '$subkey'";
					//$result = api_sql_query($sql, __FILE__, __LINE__);
					$result = api_set_setting($key,'true',$subkey,null,$_configuration['access_url']);				
				}
			}
		}
		header('Location: settings.php?action=stored&category='.$_GET['category']);
		exit;
	}
}

// including the header (banner)
Display :: display_header($tool_name);
//api_display_tool_title($tool_name);

// displaying the message that the settings have been stored
if (!empty($_GET['action']) && $_GET['action'] == "stored")
{
	Display :: display_normal_message($SettingsStored);
}

// the action images
$action_images['platform'] 		= 'dokeos.gif';
$action_images['course'] 		= 'lp_dokeos_module.gif';
$action_images['tools'] 		= 'reference.gif';
$action_images['user'] 			= 'students.gif';
$action_images['gradebook']		= 'gradebook_eval_not_empty.gif';
$action_images['ldap'] 			= 'loginmanager.gif';
$action_images['security'] 		= 'passwordprotected.gif';
$action_images['languages']		= 'forum.gif';
$action_images['tuning'] 		= 'tuning.gif';
$action_images['plugins'] 		= 'plugin.gif';
$action_images['stylesheets'] 	= 'theme.gif';


// grabbing the categories
//$selectcategories = "SELECT DISTINCT category FROM ".$table_settings_current." WHERE category NOT IN ('stylesheets','Plugins')";
//$resultcategories = api_sql_query($selectcategories, __FILE__, __LINE__);
$resultcategories = api_get_settings_categories(array('stylesheets','Plugins'));
echo "\n<div class=\"actions\">";
//while ($row = mysql_fetch_array($resultcategories))
foreach($resultcategories as $row)
{
	echo "\n\t<a href=\"".api_get_self()."?category=".$row['category']."\">".Display::return_icon($action_images[strtolower($row['category'])], ucfirst(get_lang($row['category']))).ucfirst(get_lang($row['category']))."</a>";
}
echo "\n\t<a href=\"".api_get_self()."?category=Plugins\">".Display::return_icon($action_images['plugins'], ucfirst(get_lang('Plugins'))).ucfirst(get_lang('Plugins'))."</a>";
echo "\n\t<a href=\"".api_get_self()."?category=stylesheets\">".Display::return_icon($action_images['stylesheets'], ucfirst(get_lang('Stylesheets'))).ucfirst(get_lang('Stylesheets'))."</a>";
echo "\n</div>";

if (isset ($_GET['category']))
{
	switch ($_GET['category'])
	{
		// displaying the extensions: plugins
		// this will be available to all the sites (access_urls)
		case 'Plugins' :
			handle_plugins();
			break;
			// displaying the extensions: Stylesheets
		case 'stylesheets' :
			handle_stylesheets();
			break;
		default :
			$form->display();
	}
}

/*
==============================================================================
		FOOTER
==============================================================================
*/
Display :: display_footer();



/*
==============================================================================
		FUNCTIONS
==============================================================================
*/
/**
 * The function that retrieves all the possible settings for a certain config setting
 * @author Patrick Cool <patrick.cool@UGent.be>, Ghent University
*/
function get_settings_options($var)
{
	$table_settings_options = Database :: get_main_table(TABLE_MAIN_SETTINGS_OPTIONS);
	$sql = "SELECT * FROM $table_settings_options WHERE variable='$var'";
	$result = api_sql_query($sql, __FILE__, __LINE__);
	while ($row = mysql_fetch_array($result))
	{
		$temp_array = array ('value' => $row['value'], 'display_text' => $row['display_text']);
		$settings_options_array[] = $temp_array;
	}
	return $settings_options_array;
}

/**
 * This function allows easy activating and inactivating of plugins
 * @todo: a similar function needs to be written to activate or inactivate additional tools.
 * @author Patrick Cool <patrick.cool@UGent.be>, Ghent University
*/
function handle_plugins()
{
	global $SettingsStored;
	$userplugins = array();
	$table_settings_current = Database :: get_main_table(TABLE_MAIN_SETTINGS_CURRENT);

	if (!empty($_POST['submit_plugins']))
	{
		store_plugins();
		Display :: display_normal_message($SettingsStored);
	}

	echo get_lang('AvailablePlugins')."<br/><br/>";

	/* We scan the plugin directory. Each folder is a potential plugin. */
	$pluginpath = api_get_path(SYS_PLUGIN_PATH);

	$handle = @opendir($pluginpath);
	while (false !== ($file = readdir($handle)))
	{
		if ($file <> '.' AND $file <> '..' AND is_dir(api_get_path(SYS_PLUGIN_PATH).$file))
		{
			$possibleplugins[] = $file;
		}
	}
	@closedir($handle);

	/* 	for each of the possible plugin dirs we check if a file plugin.php (that contains all the needed information about this plugin)
	 	can be found in the dir.
		this plugin.php file looks like
		$plugin_info['title']='The title of the plugin'; //
		$plugin_info['comment']="Some comment about the plugin";
		$plugin_info['location']=array("loginpage_menu", "campushomepage_menu","banner"); // the possible locations where the plugins can be used
		$plugin_info['version']='0.1 alpha'; // The version number of the plugin
		$plugin_info['author']='Patrick Cool'; // The author of the plugin
	*/
	echo '<form name="plugins" method="post" action="'.api_get_self().'?category='.$_GET['category'].'">';
	echo "<table class=\"data_table\">\n";
	echo "\t<tr>\n";
	echo "\t\t<th>\n";
	echo get_lang('Plugin');
	echo "\t\t</th>\n";
	echo "\t\t<th>\n";
	echo get_lang('LoginPageMainArea');
	echo "\t\t</th>\n";
	echo "\t\t<th>\n";
	echo get_lang('LoginPageMenu');
	echo "\t\t</th>\n";
	echo "\t\t<th>\n";
	echo get_lang('CampusHomepageMainArea');
	echo "\t\t</th>\n";
	echo "\t\t<th>\n";
	echo get_lang('CampusHomepageMenu');
	echo "\t\t</th>\n";
	echo "\t\t<th>\n";
	echo get_lang('MyCoursesMainArea');
	echo "\t\t</th>\n";
	echo "\t\t<th>\n";
	echo get_lang('MyCoursesMenu');
	echo "\t\t</th>\n";
	echo "\t\t<th>\n";
	echo get_lang('Header');
	echo "\t\t</th>\n";
	echo "\t\t<th>\n";
	echo get_lang('Footer');
	echo "\t\t</th>\n";
	echo "\t</tr>\n";

	/* We retrieve all the active plugins. */
	//$sql = "SELECT * FROM $table_settings_current WHERE category='Plugins'";
	//$result = api_sql_query($sql);
	$result = api_get_settings('Plugins');
	//while ($row = mysql_fetch_array($result))
	foreach($result as $row)
	{
		$usedplugins[$row['variable']][] = $row['selected_value'];
	}

	/* We display all the possible plugins and the checkboxes */
	foreach ($possibleplugins as $testplugin)
	{
		$plugin_info_file = api_get_path(SYS_PLUGIN_PATH).$testplugin."/plugin.php";
		if (file_exists($plugin_info_file))
		{
			$plugin_info = array();
			include ($plugin_info_file);

			echo "\t<tr>\n";
			echo "\t\t<td>\n";
			foreach ($plugin_info as $key => $value)
			{
				if ($key <> 'location')
				{
					if ($key == 'title')
					{
						$value = '<strong>'.$value.'</strong>';
					}
					echo get_lang(ucwords($key)).': '.$value.'<br />';
				}
			}
			if (file_exists(api_get_path(SYS_PLUGIN_PATH).$testplugin.'/readme.txt'))
			{
				echo "<a href='".api_get_path(WEB_PLUGIN_PATH).$testplugin."/readme.txt'>readme.txt</a>";
			}
			echo "\t\t</td>\n";

			// column: LoginPageMainArea
			if(empty($usedplugins))
			{
				$usedplugins = array();
			}
			display_plugin_cell('loginpage_main', $plugin_info, $testplugin, $usedplugins);
			display_plugin_cell('loginpage_menu', $plugin_info, $testplugin, $usedplugins);
			display_plugin_cell('campushomepage_main', $plugin_info, $testplugin, $usedplugins);
			display_plugin_cell('campushomepage_menu', $plugin_info, $testplugin, $usedplugins);
			display_plugin_cell('mycourses_main', $plugin_info, $testplugin, $usedplugins);
			display_plugin_cell('mycourses_menu', $plugin_info, $testplugin, $usedplugins);
			display_plugin_cell('header', $plugin_info, $testplugin, $usedplugins);
			display_plugin_cell('footer', $plugin_info, $testplugin, $usedplugins);
			echo "\t</tr>\n";
				}
				}
	echo '</table>';

	echo '<input type="submit" name="submit_plugins" value="'.get_lang('Ok').'" /></form>';
			}


function display_plugin_cell($location, $plugin_info, $current_plugin, $active_plugins)
{
	echo "\t\t<td align=\"center\">\n";
	if (in_array($location, $plugin_info['location']))
	{
		if (isset($active_plugins[$location]) && is_array($active_plugins[$location]) 
			&& in_array($current_plugin, $active_plugins[$location]))
		{
			$checked = "checked";
		}
		else
		{
			$checked = '';
		}
		echo '<input type="checkbox" name="'.$current_plugin.'-'.$location.'" value="true" '.$checked.'/>';
	}
	echo "\t\t</td>\n";
}

/**
 * This function allows the platform admin to choose the default stylesheet
 * @author Patrick Cool <patrick.cool@UGent.be>, Ghent University
*/
function handle_stylesheets()
{
	global $_configuration;
	// Current style
	$currentstyle = api_get_setting('stylesheets');
	$is_style_changeable=false;
	
	if ($_configuration['access_url']!=1)
	{
		$style_info = api_get_settings('stylesheets','',1,0);
		$url_info = api_get_access_url($_configuration['access_url']);	 
		if ($style_info[0]['access_url_changeable']==1 && $url_info['active']==1)
		{
			$is_style_changeable=true;			
			echo '<a href="" id="stylesheetuploadlink" onclick="document.getElementById(\'newstylesheetform\').style.display = \'block\'; document.getElementById(\'stylesheetuploadlink\').style.display = \'none\';return false; ">'.get_lang('UploadNewStylesheet').'</a>';
		} 
	}
	else
	{
		$is_style_changeable=true;
		echo '<a href="" id="stylesheetuploadlink" onclick="document.getElementById(\'newstylesheetform\').style.display = \'block\'; document.getElementById(\'stylesheetuploadlink\').style.display = \'none\';return false; ">'.get_lang('UploadNewStylesheet').'</a>';
	}	
		
	$form = new FormValidator('stylesheet_upload','post','settings.php?category=stylesheets&showuploadform=true');
	$form->addElement('text','name_stylesheet',get_lang('NameStylesheet'),array('size' => '40', 'maxlength' => '40'));	
	$form->addRule('name_stylesheet', get_lang('ThisFieldIsRequired'), 'required');
	$form->addElement('file', 'new_stylesheet', get_lang('UploadNewStylesheet'));
	$allowed_file_types = array ('css');
	$form->addRule('new_stylesheet', get_lang('InvalidExtension').' ('.implode(',', $allowed_file_types).')', 'filetype', $allowed_file_types);
	$form->addRule('new_stylesheet', get_lang('ThisFieldIsRequired'), 'required');
	$form->addElement('submit', 'stylesheet_upload', get_lang('Ok'));
	if( $form->validate() AND is_writable(api_get_path(SYS_CODE_PATH).'css/'))
	{
		$values = $form->exportValues();
		$picture_element = & $form->getElement('new_stylesheet');
		$picture = $picture_element->getValue();
		upload_stylesheet($values, $picture);
		Display::display_confirmation_message(get_lang('StylesheetAdded'));
	}
	else 
	{
		if (!is_writable(api_get_path(SYS_CODE_PATH).'css/'))
		{
			Display::display_error_message(api_get_path(SYS_CODE_PATH).'css/'.get_lang('IsNotWritable'));
		}
		else 
		{
			if ($_GET['showuploadform'] == 'true')
			{
				echo '<div id="newstylesheetform">';
			}
			else 
			{
				echo '<div id="newstylesheetform" style="display: none;">';
			}
				// uploading a new stylesheet
			if ($_configuration['access_url']==1)
			{
				$form->display();	
			}
			else
			{
				if ($is_style_changeable)
				{
					$form->display();				
				}
			}
			echo '</div>';
		}
	}

	// Preview of the stylesheet
	echo '<div><iframe src="style_preview.php" width="100%" height="300" name="preview"></iframe></div>';

	echo '<form name="stylesheets" method="post" action="'.api_get_self().'?category='.$_GET['category'].'">';
	if ($handle = @opendir(api_get_path(SYS_PATH).'main/css/'))
	{
		$counter=1;
		while (false !== ($style_dir = readdir($handle)))
		{
			if(substr($style_dir,0,1)=='.') //skip dirs starting with a '.'
			{
				continue;
			}
			$dirpath = api_get_path(SYS_PATH).'main/css/'.$style_dir;
			if (is_dir($dirpath))
			{
				if ($style_dir != '.' && $style_dir != '..')
				{
					if ($currentstyle == $style_dir OR ($style_dir == 'dokeos_classic' AND !$currentstyle))
					{
						$selected = 'checked="checked"';
					}
					else
					{
						$selected = '';
					}
					$show_name=ucwords(str_replace('_',' ', $style_dir));
					
					if ($is_style_changeable)
					{					
						echo "<input type=\"radio\" name=\"style\" value=\"".$style_dir."\" ".$selected." onClick=\"parent.preview.location='style_preview.php?style=".$style_dir."';\"/>";
						echo '<a href="style_preview.php?style='.$style_dir.'" target="preview">'.$show_name.'</a>';
					}
					else
						echo '<a href="style_preview.php?style='.$style_dir.'" target="preview">'.$show_name.'</a>';
					//echo '<div id="Layer'.$counter.'" style="position:relative; width:687px; z-index:2; visibility: hidden;">';
					//echo '<a href="#" onClick="MM_showHideLayers(\'Layer'.$counter.'\',\'\',\'hide\')">'.get_lang('Close').'</a>';
					//echo '<iframe src="style_preview.php?style='.$file.'" width="100%" style="float:right;"></iframe></div>';
					echo "<br />\n";
					$counter++;
				}
			}
		}
		@closedir($handle);
	}
	if ($is_style_changeable)
	{	
		echo '<input type="submit" name="submit_stylesheets" value="'.get_lang('Ok').'" /></form>';
	}
}

/**
 * creates the folder (if needed) and uploads the stylesheet in it
 *
 * @param array $values the values of the form
 * @param array $picture the values of the uploaded file
 * 
 * @author Patrick Cool <patrick.cool@UGent.be>, Ghent University, Belgium
 * @version May 2008
 * @since Dokeos 1.8.5
 */
function upload_stylesheet($values,$picture)
{
	// valid name for the stylesheet folder
	$style_name = ereg_replace("[^A-Za-z0-9]", "", $values['name_stylesheet'] );
	
	// create the folder if needed
	if(!is_dir(api_get_path(SYS_CODE_PATH).'css/'.$style_name.'/'))
	{
		if(mkdir(api_get_path(SYS_CODE_PATH).'css/'.$style_name.'/'))
		{
			$perm = api_get_setting('permissions_for_new_directories');
			$perm = octdec(!empty($perm)?$perm:'0770');
			chmod(api_get_path(SYS_CODE_PATH).'css/'.$style_name.'/');
		}		
	}
	
	// move the file in the folder
	move_uploaded_file($picture['tmp_name'], api_get_path(SYS_CODE_PATH).'css/'.$style_name.'/'.$picture['name']);
}

/**
 * This function allows easy activating and inactivating of plugins
 * @todo: a similar function needs to be written to activate or inactivate additional tools.
 * @author Patrick Cool <patrick.cool@UGent.be>, Ghent University
*/
function store_plugins()
{
	$table_settings_current = Database :: get_main_table(TABLE_MAIN_SETTINGS_CURRENT);
	global $_configuration;

	// Step 1 : we remove all the plugins
	//$sql = "DELETE FROM $table_settings_current WHERE category='Plugins'";
	//api_sql_query($sql, __LINE__, __FILE__);
	$r = api_delete_category_settings('Plugins',$_configuration['access_url']);

	// step 2: looping through all the post values we only store these which are really a valid plugin location.
	foreach ($_POST as $form_name => $formvalue)
	{
		$form_name_elements = explode("-", $form_name);
		if (is_valid_plugin_location($form_name_elements[1]))
		{
			//$sql = "INSERT into $table_settings_current (variable,category,selected_value) VALUES ('".$form_name_elements['1']."','Plugins','".$form_name_elements['0']."')";
			//api_sql_query($sql, __LINE__, __FILE__);
			api_add_setting($form_name_elements['0'],$form_name_elements['1'],$form_name_elements['0'],null,'Plugins',$form_name_elements['0'],null,null,null,$_configuration['access_url'],1);			
		}
	}
}

/**
 * Check if the post information is really a valid plugin location.
 * @author Patrick Cool <patrick.cool@UGent.be>, Ghent University
*/
function is_valid_plugin_location($location)
{
	$valid_locations=array('loginpage_main', 'loginpage_menu', 'campushomepage_main', 'campushomepage_menu', 'mycourses_main', 'mycourses_menu','header', 'footer');
	if (in_array($location, $valid_locations))
	{
		return true;
	}
	else
	{
		return false;
	}
}


/**
 * This function allows the platform admin to choose which should be the default stylesheet
 * @author Patrick Cool <patrick.cool@UGent.be>, Ghent University
*/
function store_stylesheets()
{
	global $_configuration;
	// Database Table Definitions
	$table_settings_current = Database :: get_main_table(TABLE_MAIN_SETTINGS_CURRENT);

	// Insert the stylesheet
	$style = Database::escape_string($_POST['style']);
	if (is_style($style))
	{
		/*
		$sql = 'UPDATE '.$table_settings_current.' SET
				selected_value = "'.$style.'"
				WHERE variable = "stylesheets"
				AND category = "stylesheets"';

		api_sql_query($sql, __LINE__, __FILE__);
		*/
		
		api_set_setting('stylesheets',$style,null,'stylesheets',$_configuration['access_url']);
	}

	return true;
}

/**
 * This function checks if the given style is a recognize style that exists in the css directory as
 * a standalone directory.
 * @param	string	Style
 * @return	bool	True if this style is recognized, false otherwise
 */
function is_style($style)
{
	$dir = api_get_path(SYS_PATH).'main/css/';
	$dirs = scandir($dir);
	$style = str_replace(array('/','\\'),array('',''),$style); //avoid slashes or backslashes
	if (in_array($style,$dirs) && is_dir($dir.$style))
	{
		return true;
	}
	return false;
}
?>