LDAPAccountManager/lam/lib/baseModule.inc

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<?php
/*
$Id$
This code is part of LDAP Account Manager (http://www.sourceforge.net/projects/lam)
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Copyright (C) 2003 - 2006 Roland Gruber
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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.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/**
* This is the parent class for all account modules.
*
* It implements the complete module interface and uses meta-data
* provided by the account modules for its functions.
*
* @package modules
* @author Roland Gruber
*/
/**
* Parent class of all account modules
*
* @package modules
*/
class baseModule {
/** includes all meta data provided by the sub class */
var $meta;
/** the account type of this module (user, group, host) */
var $scope;
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/** configuration settings of all modules */
var $moduleSettings;
/** name of parent accountContainer ($_SESSION[$base]) */
var $base;
/** contains all ldap attributes which should be written */
var $attributes;
/** contains all ldap attributes which are loaded from ldap */
var $orig;
/** contains all messages wich were triggered*/
var $triggered_messages;
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/** contains all error messages of a module */
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var $messages;
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/**
* Creates a new base module class
*
* @param string $scope the account type (user, group, host)
*/
function baseModule($scope) {
$this->scope = $scope;
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$this->load_Messages();
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$this->meta = $this->get_metaData();
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if (isset($_SESSION['config'])) $this->moduleSettings = $_SESSION['config']->get_moduleSettings();
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}
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/**
* This function fills the $messages variable with output messages from this module.
*/
function load_Messages() {
}
/**
* Initializes the module after it became part of an accountContainer
*
* @param string $base the name of the accountContainer object ($_SESSION[$base])
*/
function init($base) {
$this->base = $base;
}
/**
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* This function loads the LDAP attributes for this module.
*
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* @param array $attributes attribute list
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*/
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function load_attributes($attributes) {
$this->attributes = array();
$this->attributes = array();
// load object classes
if (isset($attributes['objectClass'])) {
$this->attributes['objectClass'] = $attributes['objectClass'];
$this->orig['objectClass'] = $attributes['objectClass'];
}
else {
$this->attributes['objectClass'] = array();
$this->orig['objectClass'] = array();
}
// add object classes if needed
$objectClasses = $this->getManagedObjectClasses();
for ($i = 0; $i < sizeof($objectClasses); $i++) {
if (!in_array($objectClasses[$i], $this->attributes['objectClass'])) $this->attributes['objectClass'][] = $objectClasses[$i];
}
// load attributes
$attributeNames = $this->getManagedAttributes();
for ($i = 0; $i < sizeof($attributeNames); $i++) {
if (isset($attributes[$attributeNames[$i]])) {
$this->attributes[$attributeNames[$i]] = $attributes[$attributeNames[$i]];
$this->orig[$attributeNames[$i]] = $attributes[$attributeNames[$i]];
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}
}
}
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/**
* Dummy function, meta data is provided by sub classes.
*
* @return array empty array
*/
function get_metaData() {
return array();
}
/**
* Returns the account type of this module (user, group, host)
*
* @return string account type
*/
function get_scope() {
return $this->scope;
}
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/**
* Returns true if this module fits for the current scope.
*
* @return boolean true if module fits
*/
function can_manage() {
if (is_array($this->meta["account_types"]) && in_array($this->scope, $this->meta["account_types"])) return true;
else return false;
}
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/**
* Returns true if this module is enough to provide a sensible account.
*
* There is no relation to the name of this class.
*
* @return boolean true if base module
*/
function is_base_module() {
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if (isset($this->meta['is_base']) && ($this->meta['is_base'] == true)) return true;
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else return false;
}
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/**
* returns an LDAP filter for the account lists
*
* @return string LDAP filter
*/
function get_ldap_filter() {
if (isset($this->meta['ldap_filter'])) return $this->meta['ldap_filter'];
else return "";
}
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/**
* Returns an alias name for the module.
*
* This alias is used in various places instead of the less descriptive class name.
* The alias also has less syntax restrictions and may contain spaces or special characters.
*
* @return string alias name
*/
function get_alias() {
if (isset($this->meta['alias'])) return $this->meta['alias'];
else return get_class($this);
}
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/**
* Returns a list of possible LDAP attributes which can be used to form the RDN.
*
* The returned elements have this form: <attribute> => <priority>
* <br> <attribute> is the name of the LDAP attribute
* <br> <priority> defines the priority of the attribute (can be "low", "normal", "high")
*
* @return array list of attributes
*/
function get_RDNAttributes() {
if (isset($this->meta['RDN'])) return $this->meta['RDN'];
else return array();
}
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/**
* This function returns a list with all depending and conflicting modules.
*
* @return array list of dependencies and conflicts
*/
function get_dependencies() {
if (isset($this->meta['dependencies'])) return $this->meta['dependencies'];
else return array('depends' => array(), 'conflicts' => array());
}
/**
* Returns a list of elements for the account profiles.
*
* @return profile elements
*/
function get_profileOptions() {
if (isset($this->meta['profile_options'])) return $this->meta['profile_options'];
else return array();
}
/**
* Checks input values of account profiles.
*
* @param array $options a hash array (name => value) containing the options
* @return array list of error messages (array(type, title, text)) to generate StatusMessages, if any
*/
function check_profileOptions($options) {
$messages = array();
if (is_array($this->meta['profile_checks'])) {
$identifiers = array_keys($this->meta['profile_checks']);
for ($i = 0; $i < sizeof($identifiers); $i++) {
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// empty input
if (($options[$identifiers[$i]][0] == '') || !isset($options[$identifiers[$i]][0])) {
// check if option is required
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if (isset($this->meta['profile_checks'][$identifiers[$i]]['required']) && $this->meta['profile_checks'][$identifiers[$i]]['required']) {
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$messages[] = $this->meta['profile_checks'][$identifiers[$i]]['required_message'];
}
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continue;
}
switch ($this->meta['profile_checks'][$identifiers[$i]]['type']) {
// check by regular expression (from account.inc)
case "ext_preg":
// ignore empty fileds
if ($options[$identifiers[$i]][0] == '') continue;
if (! get_preg($options[$identifiers[$i]][0], $this->meta['profile_checks'][$identifiers[$i]]['regex'])) {
$messages[] = $this->meta['profile_checks'][$identifiers[$i]]['error_message'];
}
break;
// check by regular expression (case insensitive)
case 'regex_i':
// ignore empty fileds
if ($options[$identifiers[$i]][0] == '') continue;
if (! eregi($this->meta['profile_checks'][$identifiers[$i]]['regex'], $options[$identifiers[$i]][0])) {
$messages[] = $this->meta['profile_checks'][$identifiers[$i]]['error_message'];
}
break;
// check by regular expression (case sensitive)
case 'regex':
// ignore empty fileds
if ($options[$identifiers[$i]][0] == '') continue;
if (! ereg($this->meta['profile_checks'][$identifiers[$i]]['regex'], $options[$identifiers[$i]][0])) {
$messages[] = $this->meta['profile_checks'][$identifiers[$i]]['error_message'];
}
break;
// check by integer comparison (greater)
case 'int_greater':
// ignore if both fields are empty
if (($options[$this->meta['profile_checks'][$identifiers[$i]]['cmp_name1']][0] == '') && ($options[$this->meta['profile_checks'][$identifiers[$i]]['cmp_name2']][0] == '')) continue;
// print error message if only one field is empty
if (($options[$this->meta['profile_checks'][$identifiers[$i]]['cmp_name1']][0] == '') || ($options[$this->meta['profile_checks'][$identifiers[$i]]['cmp_name2']][0] == '')) {
$messages[] = $this->meta['profile_checks'][$identifiers[$i]]['error_message'];
continue;
}
// compare
if (!(intval($options[$this->meta['profile_checks'][$identifiers[$i]]['cmp_name1']][0]) > intval($options[$this->meta['profile_checks'][$identifiers[$i]]['cmp_name2']][0]))) {
$messages[] = $this->meta['profile_checks'][$identifiers[$i]]['error_message'];
}
break;
// check by integer comparison (greater or equal)
case 'int_greaterOrEqual':
// ignore if both fields are empty
if (($options[$this->meta['profile_checks'][$identifiers[$i]]['cmp_name1']][0] == '') && ($options[$this->meta['profile_checks'][$identifiers[$i]]['cmp_name2']][0] == '')) continue;
// print error message if only one field is empty
if (($options[$this->meta['profile_checks'][$identifiers[$i]]['cmp_name1']][0] == '') || ($options[$this->meta['profile_checks'][$identifiers[$i]]['cmp_name2']][0] == '')) {
$messages[] = $this->meta['profile_checks'][$identifiers[$i]]['error_message'];
continue;
}
// compare
if (!(intval($options[$this->meta['profile_checks'][$identifiers[$i]]['cmp_name1']][0]) >= intval($options[$this->meta['profile_checks'][$identifiers[$i]]['cmp_name2']][0]))) {
$messages[] = $this->meta['profile_checks'][$identifiers[$i]]['error_message'];
}
break;
// print error message for invalid types
default:
StatusMessage("ERROR", "Unsupported type!", $this->meta['profile_checks'][$identifiers[$i]]['type']);
break;
}
}
}
return $messages;
}
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/**
* Loads the values of an account profile into internal variables.
*
* @param array $profile hash array with profile values (identifier => value)
*/
function load_profile($profile) {
if (isset($this->meta['profile_mappings'])) {
$identifiers = array_keys($this->meta['profile_mappings']);
for ($i = 0; $i < sizeof($identifiers); $i++) {
if (isset($profile[$identifiers[$i]])) {
$this->attributes[$this->meta['profile_mappings'][$identifiers[$i]]] = $profile[$identifiers[$i]];
}
}
}
}
/**
* Returns a list of elements for the configuration.
*
* @param array $scopes account types (user, group, host)
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* @param array $allScopes list of all modules and active scopes
* @return array configuration elements
*/
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function get_configOptions($scopes, $allScopes) {
$return = array();
for ($i = 0; $i < sizeof($scopes); $i++) {
if (isset($this->meta['config_options'][$scopes[$i]])) $return = array_merge($return, $this->meta['config_options'][$scopes[$i]]);
}
if (isset($this->meta['config_options']['all'])) $return = array_merge($return, $this->meta['config_options']['all']);
return $return;
}
/**
* Returns an array containing descriptions shown on configuration pages.
*
* The returned array has the format array('legend' => '...', descriptions => array('option1' => '...', ...)).
* <br> The "legend" value is used as text for the fieldset, the descriptions are used when the configuration is printed.
*
* @return array configuration elements
*/
function get_configDescriptions() {
$return = array('legend' => 'no description', 'descriptions' => array());
if (isset($this->meta['config_descriptions'])) $return = $this->meta['config_descriptions'];
return $return;
}
/**
* Checks input values of module settings.
*
* @param array $scopes list of account types which are used
* @param array $options hash array containing the settings (array('option' => array('value')))
* @return array list of error messages
*/
function check_configOptions($scopes, $options) {
$messages = array();
$scopes[] = 'all'; // add checks that are independent of scope
for ($s = 0; $s < sizeof($scopes); $s++) {
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if (isset($this->meta['config_checks'][$scopes[$s]]) && is_array($this->meta['config_checks'][$scopes[$s]])) {
$identifiers = array_keys($this->meta['config_checks'][$scopes[$s]]);
for ($i = 0; $i < sizeof($identifiers); $i++) {
// check if option is required
if ($this->meta['config_checks'][$scopes[$s]][$identifiers[$i]]['required'] && ($options[$identifiers[$i]][0] == '')) {
$messages[] = $this->meta['config_checks'][$scopes[$s]][$identifiers[$i]]['required_message'];
}
switch ($this->meta['config_checks'][$scopes[$s]][$identifiers[$i]]['type']) {
// check by regular expression (from account.inc)
case "ext_preg":
// ignore empty fileds
if ($options[$identifiers[$i]][0] == '') continue;
if (! get_preg($options[$identifiers[$i]][0], $this->meta['config_checks'][$scopes[$s]][$identifiers[$i]]['regex'])) {
$messages[] = $this->meta['config_checks'][$scopes[$s]][$identifiers[$i]]['error_message'];
}
break;
// check by regular expression (case insensitive)
case "regex_i":
// ignore empty fileds
if ($options[$identifiers[$i]][0] == '') continue;
if (! eregi($this->meta['config_checks'][$scopes[$s]][$identifiers[$i]]['regex'], $options[$identifiers[$i]][0])) {
$messages[] = $this->meta['config_checks'][$scopes[$s]][$identifiers[$i]]['error_message'];
}
break;
// check by regular expression (case sensitive)
case "regex":
// ignore empty fileds
if ($options[$identifiers[$i]][0] == '') continue;
if (! ereg($this->meta['config_checks'][$scopes[$s]][$identifiers[$i]]['regex'], $options[$identifiers[$i]][0])) {
$messages[] = $this->meta['config_checks'][$scopes[$s]][$identifiers[$i]]['error_message'];
}
break;
// check by integer comparison (greater)
case "int_greater":
// ignore if both fields are empty
if (($options[$this->meta['config_checks'][$scopes[$s]][$identifiers[$i]]['cmp_name1']][0] == '') && ($options[$this->meta['config_checks'][$scopes[$s]][$identifiers[$i]]['cmp_name2']][0] == '')) continue;
// print error message if only one field is empty
if (($options[$this->meta['config_checks'][$scopes[$s]][$identifiers[$i]]['cmp_name1']][0] == '') || ($options[$this->meta['config_checks'][$scopes[$s]][$identifiers[$i]]['cmp_name2']][0] == '')) {
$messages[] = $this->meta['config_checks'][$scopes[$s]][$identifiers[$i]]['error_message'];
continue;
}
// compare
if (!(intval($options[$this->meta['config_checks'][$scopes[$s]][$identifiers[$i]]['cmp_name1']][0]) > intval($options[$this->meta['config_checks'][$scopes[$s]][$identifiers[$i]]['cmp_name2']][0]))) {
$messages[] = $this->meta['config_checks'][$scopes[$s]][$identifiers[$i]]['error_message'];
}
break;
// check by integer comparison (greater or equal)
case "int_greaterOrEqual":
// ignore if both fields are empty
if (($options[$this->meta['config_checks'][$scopes[$s]][$identifiers[$i]]['cmp_name1']][0] == '') && ($options[$this->meta['config_checks'][$scopes[$s]][$identifiers[$i]]['cmp_name2']][0] == '')) continue;
// print error message if only one field is empty
if (($options[$this->meta['config_checks'][$scopes[$s]][$identifiers[$i]]['cmp_name1']][0] == '') || ($options[$this->meta['config_checks'][$scopes[$s]][$identifiers[$i]]['cmp_name2']][0] == '')) {
$messages[] = $this->meta['config_checks'][$scopes[$s]][$identifiers[$i]]['error_message'];
continue;
}
// compare
if (!(intval($options[$this->meta['config_checks'][$scopes[$s]][$identifiers[$i]]['cmp_name1']][0]) >= intval($options[$this->meta['config_checks'][$scopes[$s]][$identifiers[$i]]['cmp_name2']][0]))) {
$messages[] = $this->meta['config_checks'][$scopes[$s]][$identifiers[$i]]['error_message'];
}
break;
// print error message on undefined type
default:
StatusMessage("ERROR", "Unsupported type!", $this->meta['config_checks'][$scopes[$s]][$identifiers[$i]]['type']);
break;
}
}
}
}
return $messages;
}
/**
* Returns an array with all fields available for this account type on the PDF
* output. This method may be overwritten by subclasses or it may be used
* by using entries in the $this->meta['PDF_fields'] array of the specific sub-
* class.
*
* @param string $scope account type
* @return array list of available fields for PDF output
*/
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function get_pdfFields() {
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return ((isset($this->meta['PDF_fields'])) ? $this->meta['PDF_fields'] : array());
}
/**
* Returns a hastable with all entries that may be printed out in the PDF. The
* syntax of the hashtable is specified by the module specification and the
* corresponding DTD. This method must be overwritten in case that there
* are non static things to be returned. The $this->meta['PDF_entries'] array
* may be used when there is only static content.
*
* @param string $scope account type
* @return array hastable of entries for the PDF. Each entry is an array where
* each entry is treated as a new line in the PDF.
*/
function get_pdf_entries($scope = 'user') {
return ((isset($this->meta['PDF_entries'])) ? $this->meta['PDF_entries'] : array());
}
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/**
* Returns an array containing all input columns for the file upload.
*
* Syntax:
* <br> array(
* <br> string: name, // fixed non-translated name which is used as column name (should be of format: <module name>_<column name>)
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* <br> string: description, // short descriptive name
* <br> string: help, // help ID
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* <br> string: example, // example value
* <br> boolean: required // true, if user must set a value for this column
* <br> )
*
* @return array column list
*/
function get_uploadColumns() {
if (isset($this->meta['upload_columns'])) return $this->meta['upload_columns'];
else return array();
}
/**
* Returns a list of module names which must be processed in building the account befor this module.
*
* @return array list of module names
*/
function get_uploadPreDepends() {
if (isset($this->meta['upload_preDepends'])) return $this->meta['upload_preDepends'];
else return array();
}
/**
* In this function the LDAP account is built up.
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*
* @param array $rawAccounts list of hash arrays (name => value) from user input
* @param array $partialAccounts list of hash arrays (name => value) which are later added to LDAP
* @param array $ids list of IDs for column position (e.g. "posixAccount_uid" => 5)
* @return array list of error messages if any
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*/
function build_uploadAccounts($rawAccounts, $ids, &$partialAccounts) {
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// must be implemented in sub modules
return array();
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}
/**
* This function return the help entry array for a specific help id. Normally this->meta can be used.
*
* @param string $id The id string for the help entry needed.
* @param string $scope The scope for which the help entry should be retrieved. May be empty when
* there is now difference of the help entry depending on the actual scope.
*
* @return array The desired help entry.
*/
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function get_help($id) {
if(isset($this->meta['help'][$id])) {
return $this->meta['help'][$id];
}
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elseif(isset($this->meta['help'][$this->scope][$id])) {
return $this->meta['help'][$this->scope][$id];
}
else {
return false;
}
}
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/**
* This function is used to check if this module page can be displayed.
* It returns false if a module depends on data from other modules which was not yet entered.
*
* @return boolean true, if page can be displayed
*/
function module_ready() {
return true;
}
/**
* This functions is used to check if all settings for this module have been made.
*
* @return boolean true, if settings are complete
*/
function module_complete() {
return true;
}
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/**
* Controls if the module button the account page is visible and activated.
*
* @return string status ("enabled", "disabled", "hidden")
*/
function getButtonStatus() {
return "enabled";
}
/**
* Checks if the attribute values follow the LDAP syntax.
* Not every LDAP attribute allows UTF-8 strings. Therefore we do a syntax check here
* and change UTF-8 strings to ASCII strings if needed.
* The maximum length of the attributes is checked, too.
*
* @return mixed 0 if no errors/warnings occured, otherwise an array of status messages.
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*
* TODO: remove this function and move checks to posixAccount.inc
*/
function input_check() {
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$messages = array();
// Do a check for every ldap attribute
$attributes = array_keys($this->attributes);
for ($i=0; $i<count($attributes); $i++) {
if ($_SESSION['ldap']->attributes[$attributes[$i]]['SYNTAX']=='1.3.6.1.4.1.1466.115.121.1.36') {
// found numeric attribute
for ($j=0; $j<count($this->attributes[$attributes[$i]]); $j++)
if ($this->attributes[$attributes[$i]][$j]!=intval($this->attributes[$attributes[$i]][$j])) {
$this->attributes[$attributes[$i]][$j] = intval($this->attributes[$attributes[$i]][$j]);
$messages[$attributes[$i]] = array('WARN', _($attributes[$i]), _('Changed value %s because only numeric values are allowed.'));
}
}
else if ($_SESSION['ldap']->attributes[$attributes[$i]]['SYNTAX']=='1.3.6.1.4.1.1466.115.121.1.26' ||
$_SESSION['ldap']->attributes[$attributes[$i]]['SYNTAX']=='1.3.6.1.4.1.1466.115.121.1.44' ||
$_SESSION['ldap']->attributes[$attributes[$i]]['SYNTAX']=='1.3.6.1.4.1.1466.115.121.1.11') {
// found "7bit" ascii attribute
// convert utf8 in us-ascii
$convert = array ( 'ä' => 'ae', 'Ä' => 'Ae', 'ö' => 'Oe', 'ü' => 'ue', 'Ü' => 'Ue',
'ß' => 'ss', 'é' => 'e', 'è' => 'e', 'ô' => 'o', 'ç' => 'c'
);
$index = array_keys($convert);
for ($j=0; $j<count($this->attributes[$attributes[$i]]); $j++) {
$replaced = false;
// replace special characters
for ($k=0; $k<count($index); $k++) {
$temp = str_replace($index[$k], $convert[$index[$k]], $this->attributes[$attributes[$i]][$j]);
if ($temp!=$this->attributes[$attributes[$i]][$j]) {
$this->attributes[$attributes[$i]][$j] = $temp;
$replaced = true;
}
}
// remove remaining UTF-8 characters
for ($c = 0; $c < strlen($this->attributes[$attributes[$i]][$j]); $c++) {
if (ord($this->attributes[$attributes[$i]][$j][$c]) > 127) {
$this->attributes[$attributes[$i]][$j] = substr($this->attributes[$attributes[$i]][$j], 0, $c) .
substr($this->attributes[$attributes[$i]][$j], $c + 2);
$replaced = true;
}
}
if ($replaced) {
$messages[$attributes[$i]][] = array('WARN', _($attributes[$i]), _('Changed value because only ASCII characters are allowed.'));
}
}
}
// TODO length check
}
if (count($messages)!=0) return $messages;
else return 0;
}
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/**
* This function executes one post upload action.
*
* @param array $data array containing one account in each element
* @param array $ids array(<column_name> => <column number>)
* @param array $failed list of accounts which were not created successfully
* @param array $temp variable to store temporary data between two post actions
* @return array current status
* <br> array (
* <br> 'status' => 'finished' | 'inProgress'
* <br> 'progress' => 0..100
* <br> 'errors' => array (<array of parameters for StatusMessage>)
* <br> )
*/
function doUploadPostActions($data, $ids, $failed, &$temp) {
return array(
'status' => 'finished',
'progress' => 100,
'errors' => array()
);
}
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/**
* Returns a list of modifications which have to be made to the LDAP account.
*
* @return array list of modifications
* <br>This function returns an array with 3 entries:
* <br>array( DN1 ('add' => array($attr), 'remove' => array($attr), 'modify' => array($attr)), DN2 .... )
* <br>DN is the DN to change. It may be possible to change several DNs (e.g. create a new user and add him to some groups via attribute memberUid)
* <br>"add" are attributes which have to be added to LDAP entry
* <br>"remove" are attributes which have to be removed from LDAP entry
* <br>"modify" are attributes which have to been modified in LDAP entry
*/
function save_attributes() {
return $_SESSION[$this->base]->save_module_attributes($this->attributes, $this->orig);
}
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/**
* Dummy function for modules which use no special options on account deletion.
*
* @param $post The HTTP POST variables of the delete page
* @return List of LDAP operations, same as for save_attributes()
*/
function delete_attributes($post) {
return 0;
}
/**
* Dummy function for modules which do not print extra HTML code on account deletion.
*
* @param $post HTTP POST values
* @return meta HTML code
*/
function display_html_delete(&$post) {
return 0;
}
/**
* Returns a list of managed object classes for this module.
* This is used to fix incorrect spelled object class names.
*
* @return array list of object classes
*/
function getManagedObjectClasses() {
if (isset($this->meta['objectClasses']) && is_array($this->meta['objectClasses'])) return $this->meta['objectClasses'];
else return array();
}
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/**
* Returns a list of aliases for LDAP attributes.
* All alias attributes will be renamed to the given attribute names.
*
* @return array list of aliases (alias name => attribute name)
*/
function getLDAPAliases() {
if (isset($this->meta['LDAPaliases']) && is_array($this->meta['LDAPaliases'])) return $this->meta['LDAPaliases'];
else return array();
}
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/**
* Returns a list of LDAP attributes which are managed by this module.
* All attribute names will be renamed to match the given spelling.
*
* @return array list of attributes
*/
function getManagedAttributes() {
if (isset($this->meta['attributes']) && is_array($this->meta['attributes'])) return $this->meta['attributes'];
else return array();
}
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/**
* Returns a list of required PHP extensions.
*
* @return array extensions
*/
function getRequiredExtensions() {
if (isset($this->meta['extensions']) && is_array($this->meta['extensions'])) return $this->meta['extensions'];
else return array();
}
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}
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?>