<?php
/**
 * PHP LDAP CLASS FOR MANIPULATING ACTIVE DIRECTORY 
 * Version 4.0.4
 * 
 * PHP Version 5 with SSL and LDAP support
 * 
 * Written by Scott Barnett, Richard Hyland
 *   email: scott@wiggumworld.com, adldap@richardhyland.com
 *   http://adldap.sourceforge.net/
 * 
 * Copyright (c) 2006-2012 Scott Barnett, Richard Hyland
 * 
 * We'd appreciate any improvements or additions to be submitted back
 * to benefit the entire community :)
 * 
 * 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.
 * 
 * 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.
 * 
 * @category ToolsAndUtilities
 * @package adLDAP
 * @subpackage User
 * @author Scott Barnett, Richard Hyland
 * @copyright (c) 2006-2012 Scott Barnett, Richard Hyland
 * @license http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html LGPLv2.1
 * @revision $Revision: 97 $
 * @version 4.0.4
 * @link http://adldap.sourceforge.net/
 */
require_once(dirname(__FILE__) . '/../adLDAP.php');
require_once(dirname(__FILE__) . '/../collections/adLDAPUserCollection.php');

/**
* USER FUNCTIONS
*/
class adLDAPUsers {
    /**
    * The current adLDAP connection via dependency injection
    * 
    * @var adLDAP
    */
    protected $adldap;
    
    public function __construct(adLDAP $adldap) {
        $this->adldap = $adldap;
    }
    
    /**
    * Validate a user's login credentials
    * 
    * @param string $username A user's AD username
    * @param string $password A user's AD password
    * @param bool optional $prevent_rebind
    * @return bool
    */
    public function authenticate($username, $password, $preventRebind = false) {
        return $this->adldap->authenticate($username, $password, $preventRebind);
    }
    
    /**
    * Create a user
    * 
    * If you specify a password here, this can only be performed over SSL
    * 
    * @param array $attributes The attributes to set to the user account
    * @return bool
    */
    public function create($attributes)
    {
        // Check for compulsory fields
        if (!array_key_exists("username", $attributes)){ return "Missing compulsory field [username]"; }
        if (!array_key_exists("firstname", $attributes)){ return "Missing compulsory field [firstname]"; }
        if (!array_key_exists("surname", $attributes)){ return "Missing compulsory field [surname]"; }
        if (!array_key_exists("email", $attributes)){ return "Missing compulsory field [email]"; }
        if (!array_key_exists("container", $attributes)){ return "Missing compulsory field [container]"; }
        if (!is_array($attributes["container"])){ return "Container attribute must be an array."; }

        if (array_key_exists("password",$attributes) && (!$this->adldap->getUseSSL() && !$this->adldap->getUseTLS())){ 
            throw new adLDAPException('SSL must be configured on your webserver and enabled in the class to set passwords.');
        }

        if (!array_key_exists("display_name", $attributes)) { 
            $attributes["display_name"] = $attributes["firstname"] . " " . $attributes["surname"]; 
        }

        // Translate the schema
        $add = $this->adldap->adldap_schema($attributes);
        
        // Additional stuff only used for adding accounts
        $add["cn"][0] = $attributes["display_name"];
        $add["samaccountname"][0] = $attributes["username"];
        $add["objectclass"][0] = "top";
        $add["objectclass"][1] = "person";
        $add["objectclass"][2] = "organizationalPerson";
        $add["objectclass"][3] = "user"; //person?
        //$add["name"][0]=$attributes["firstname"]." ".$attributes["surname"];

        // Set the account control attribute
        $control_options = array("NORMAL_ACCOUNT");
        if (!$attributes["enabled"]) { 
            $control_options[] = "ACCOUNTDISABLE"; 
        }
        $add["userAccountControl"][0] = $this->accountControl($control_options);
        
        // Determine the container
        $attributes["container"] = array_reverse($attributes["container"]);
        $container = "OU=" . implode(", OU=",$attributes["container"]);

        // Add the entry
        $result = @ldap_add($this->adldap->getLdapConnection(), "CN=" . $add["cn"][0] . ", " . $container . "," . $this->adldap->getBaseDn(), $add);
        if ($result != true) { 
            return false; 
        }
        
        return true;
    }
    
    /**
    * Account control options
    *
    * @param array $options The options to convert to int 
    * @return int
    */
    protected function accountControl($options)
    {
        $val=0;

        if (is_array($options)) {
            if (in_array("SCRIPT",$options)){ $val=$val+1; }
            if (in_array("ACCOUNTDISABLE",$options)){ $val=$val+2; }
            if (in_array("HOMEDIR_REQUIRED",$options)){ $val=$val+8; }
            if (in_array("LOCKOUT",$options)){ $val=$val+16; }
            if (in_array("PASSWD_NOTREQD",$options)){ $val=$val+32; }
            //PASSWD_CANT_CHANGE Note You cannot assign this permission by directly modifying the UserAccountControl attribute.
            //For information about how to set the permission programmatically, see the "Property flag descriptions" section.
            if (in_array("ENCRYPTED_TEXT_PWD_ALLOWED",$options)){ $val=$val+128; }
            if (in_array("TEMP_DUPLICATE_ACCOUNT",$options)){ $val=$val+256; }
            if (in_array("NORMAL_ACCOUNT",$options)){ $val=$val+512; }
            if (in_array("INTERDOMAIN_TRUST_ACCOUNT",$options)){ $val=$val+2048; }
            if (in_array("WORKSTATION_TRUST_ACCOUNT",$options)){ $val=$val+4096; }
            if (in_array("SERVER_TRUST_ACCOUNT",$options)){ $val=$val+8192; }
            if (in_array("DONT_EXPIRE_PASSWORD",$options)){ $val=$val+65536; }
            if (in_array("MNS_LOGON_ACCOUNT",$options)){ $val=$val+131072; }
            if (in_array("SMARTCARD_REQUIRED",$options)){ $val=$val+262144; }
            if (in_array("TRUSTED_FOR_DELEGATION",$options)){ $val=$val+524288; }
            if (in_array("NOT_DELEGATED",$options)){ $val=$val+1048576; }
            if (in_array("USE_DES_KEY_ONLY",$options)){ $val=$val+2097152; }
            if (in_array("DONT_REQ_PREAUTH",$options)){ $val=$val+4194304; } 
            if (in_array("PASSWORD_EXPIRED",$options)){ $val=$val+8388608; }
            if (in_array("TRUSTED_TO_AUTH_FOR_DELEGATION",$options)){ $val=$val+16777216; }
        }
        return $val;
    }
    
    /**
    * Delete a user account
    * 
    * @param string $username The username to delete (please be careful here!)
    * @param bool $isGUID Is the username a GUID or a samAccountName
    * @return array
    */
    public function delete($username, $isGUID = false) 
    {      
        $userinfo = $this->info($username, array("*"), $isGUID);
        $dn = $userinfo[0]['distinguishedname'][0];
        $result = $this->adldap->folder()->delete($dn);
        if ($result != true) { 
            return false;
        }        
        return true;
    }
    
    /**
    * Groups the user is a member of
    * 
    * @param string $username The username to query
    * @param bool $recursive Recursive list of groups
    * @param bool $isGUID Is the username passed a GUID or a samAccountName
    * @return array
    */
    public function groups($username, $recursive = NULL, $isGUID = false)
    {
        if ($username === NULL) { return false; }
        if ($recursive === NULL) { $recursive = $this->adldap->getRecursiveGroups(); } // Use the default option if they haven't set it
        if (!$this->adldap->getLdapBind()) { return false; }
        
        // Search the directory for their information
        $info = @$this->info($username, array("memberof", "primarygroupid"), $isGUID);
        $groups = $this->adldap->utilities()->niceNames($info[0]["memberof"]); // Presuming the entry returned is our guy (unique usernames)

        if ($recursive === true){
            foreach ($groups as $id => $groupName){
                $extraGroups = $this->adldap->group()->recursiveGroups($groupName);
                $groups = array_merge($groups, $extraGroups);
            }
        }
        
        return $groups;
    }
    
    /**
    * Find information about the users. Returned in a raw array format from AD
    * 
    * @param string $username The username to query
    * @param array $fields Array of parameters to query
    * @param bool $isGUID Is the username passed a GUID or a samAccountName
    * @return array
    */
    public function info($username, $fields = NULL, $isGUID = false)
    {
        if ($username === NULL) { return false; }
        if (!$this->adldap->getLdapBind()) { return false; }

        if ($isGUID === true) {
            $username = $this->adldap->utilities()->strGuidToHex($username);
            $filter = "objectguid=" . $username;
        }
        else if (strstr($username, "@")) {
             $filter = "userPrincipalName=" . $username;
        }
        else {
             $filter = "samaccountname=" . $username;
        }
        $filter = "(&(objectCategory=person)({$filter}))";
        if ($fields === NULL) { 
            $fields = array("samaccountname","mail","memberof","department","displayname","telephonenumber","primarygroupid","objectsid"); 
        }
        if (!in_array("objectsid", $fields)) {
            $fields[] = "objectsid";
        }
        $sr = ldap_search($this->adldap->getLdapConnection(), $this->adldap->getBaseDn(), $filter, $fields);
        $entries = ldap_get_entries($this->adldap->getLdapConnection(), $sr);
        
        if (isset($entries[0])) {
            if ($entries[0]['count'] >= 1) {
                if (in_array("memberof", $fields)) {
                    // AD does not return the primary group in the ldap query, we may need to fudge it
                    if ($this->adldap->getRealPrimaryGroup() && isset($entries[0]["primarygroupid"][0]) && isset($entries[0]["objectsid"][0])){
                        //$entries[0]["memberof"][]=$this->group_cn($entries[0]["primarygroupid"][0]);
                        $entries[0]["memberof"][] = $this->adldap->group()->getPrimaryGroup($entries[0]["primarygroupid"][0], $entries[0]["objectsid"][0]);
                    } else {
                        $entries[0]["memberof"][] = "CN=Domain Users,CN=Users," . $this->adldap->getBaseDn();
                    }
                    if (!isset($entries[0]["memberof"]["count"])) {
                        $entries[0]["memberof"]["count"] = 0;
                    }
                    $entries[0]["memberof"]["count"]++;
                }
            }
            
            return $entries;
        }
        return false;
    }
    
    /**
    * Find information about the users. Returned in a raw array format from AD
    * 
    * @param string $username The username to query
    * @param array $fields Array of parameters to query
    * @param bool $isGUID Is the username passed a GUID or a samAccountName
    * @return mixed
    */
    public function infoCollection($username, $fields = NULL, $isGUID = false)
    {
        if ($username === NULL) { return false; }
        if (!$this->adldap->getLdapBind()) { return false; }
        
        $info = $this->info($username, $fields, $isGUID);
        
        if ($info !== false) {
            $collection = new adLDAPUserCollection($info, $this->adldap);
            return $collection;
        }
        return false;
    }
    
    /**
    * Determine if a user is in a specific group
    * 
    * @param string $username The username to query
    * @param string $group The name of the group to check against
    * @param bool $recursive Check groups recursively
    * @param bool $isGUID Is the username passed a GUID or a samAccountName
    * @return bool
    */
    public function inGroup($username, $group, $recursive = NULL, $isGUID = false)
    {
        if ($username === NULL) { return false; }
        if ($group === NULL) { return false; }
        if (!$this->adldap->getLdapBind()) { return false; }
        if ($recursive === NULL) { $recursive = $this->adldap->getRecursiveGroups(); } // Use the default option if they haven't set it
        
        // Get a list of the groups
        $groups = $this->groups($username, $recursive, $isGUID);
        
        // Return true if the specified group is in the group list
        if (in_array($group, $groups)) { 
            return true; 
        }

        return false;
    }
    
    /**
    * Determine a user's password expiry date
    * 
    * @param string $username The username to query
    * @param book $isGUID Is the username passed a GUID or a samAccountName
    * @requires bcmath http://www.php.net/manual/en/book.bc.php
    * @return array
    */
    public function passwordExpiry($username, $isGUID = false) 
    {
        if ($username === NULL) { return "Missing compulsory field [username]"; }
        if (!$this->adldap->getLdapBind()) { return false; }
        if (!function_exists('bcmod')) { throw new adLDAPException("Missing function support [bcmod] http://www.php.net/manual/en/book.bc.php"); };
        
        $userInfo = $this->info($username, array("pwdlastset", "useraccountcontrol"), $isGUID);
        $pwdLastSet = $userInfo[0]['pwdlastset'][0];
        $status = array();
        
        if ($userInfo[0]['useraccountcontrol'][0] == '66048') {
            // Password does not expire
            return "Does not expire";
        }
        if ($pwdLastSet === '0') {
            // Password has already expired
            return "Password has expired";
        }
        
         // Password expiry in AD can be calculated from TWO values:
         //   - User's own pwdLastSet attribute: stores the last time the password was changed
         //   - Domain's maxPwdAge attribute: how long passwords last in the domain
         //
         // Although Microsoft chose to use a different base and unit for time measurements.
         // This function will convert them to Unix timestamps
         $sr = ldap_read($this->adldap->getLdapConnection(), $this->adldap->getBaseDn(), 'objectclass=*', array('maxPwdAge'));
         if (!$sr) {
             return false;
         }
         $info = ldap_get_entries($this->adldap->getLdapConnection(), $sr);
         $maxPwdAge = $info[0]['maxpwdage'][0];
         

         // See MSDN: http://msdn.microsoft.com/en-us/library/ms974598.aspx
         //
         // pwdLastSet contains the number of 100 nanosecond intervals since January 1, 1601 (UTC), 
         // stored in a 64 bit integer. 
         //
         // The number of seconds between this date and Unix epoch is 11644473600.
         //
         // maxPwdAge is stored as a large integer that represents the number of 100 nanosecond
         // intervals from the time the password was set before the password expires.
         //
         // We also need to scale this to seconds but also this value is a _negative_ quantity!
         //
         // If the low 32 bits of maxPwdAge are equal to 0 passwords do not expire
         //
         // Unfortunately the maths involved are too big for PHP integers, so I've had to require
         // BCMath functions to work with arbitrary precision numbers.
         if (bcmod($maxPwdAge, 4294967296) === '0') {
            return "Domain does not expire passwords";
        }
        
        // Add maxpwdage and pwdlastset and we get password expiration time in Microsoft's
        // time units.  Because maxpwd age is negative we need to subtract it.
        $pwdExpire = bcsub($pwdLastSet, $maxPwdAge);
    
        // Convert MS's time to Unix time
        $status['expiryts'] = bcsub(bcdiv($pwdExpire, '10000000'), '11644473600');
        $status['expiryformat'] = date('Y-m-d H:i:s', bcsub(bcdiv($pwdExpire, '10000000'), '11644473600'));
        
        return $status;
    }
    
    /**
    * Modify a user
    * 
    * @param string $username The username to query
    * @param array $attributes The attributes to modify.  Note if you set the enabled attribute you must not specify any other attributes
    * @param bool $isGUID Is the username passed a GUID or a samAccountName
    * @return bool
    */
    public function modify($username, $attributes, $isGUID = false)
    {
        if ($username === NULL) { return "Missing compulsory field [username]"; }
        if (array_key_exists("password", $attributes) && !$this->adldap->getUseSSL() && !$this->adldap->getUseTLS()) { 
            throw new adLDAPException('SSL/TLS must be configured on your webserver and enabled in the class to set passwords.');
        }

        // Find the dn of the user
        $userDn = $this->dn($username, $isGUID);
        if ($userDn === false) { 
            return false; 
        }
        
        // Translate the update to the LDAP schema                
        $mod = $this->adldap->adldap_schema($attributes);
        
        // Check to see if this is an enabled status update
        if (!$mod && !array_key_exists("enabled", $attributes)){ 
            return false; 
        }
        
        // Set the account control attribute (only if specified)
        if (array_key_exists("enabled", $attributes)){
            if ($attributes["enabled"]){ 
                $controlOptions = array("NORMAL_ACCOUNT"); 
            }
            else { 
                $controlOptions = array("NORMAL_ACCOUNT", "ACCOUNTDISABLE"); 
            }
            $mod["userAccountControl"][0] = $this->accountControl($controlOptions);
        }

        // Do the update
        $result = @ldap_modify($this->adldap->getLdapConnection(), $userDn, $mod);
        if ($result == false) { 
            return false; 
        }
        
        return true;
    }
    
    /**
    * Disable a user account
    * 
    * @param string $username The username to disable
    * @param bool $isGUID Is the username passed a GUID or a samAccountName
    * @return bool
    */
    public function disable($username, $isGUID = false)
    {
        if ($username === NULL) { return "Missing compulsory field [username]"; }
        $attributes = array("enabled" => 0);
        $result = $this->modify($username, $attributes, $isGUID);
        if ($result == false) { return false; }
        
        return true;
    }
    
    /**
    * Enable a user account
    * 
    * @param string $username The username to enable
    * @param bool $isGUID Is the username passed a GUID or a samAccountName
    * @return bool
    */
    public function enable($username, $isGUID = false)
    {
        if ($username === NULL) { return "Missing compulsory field [username]"; }
        $attributes = array("enabled" => 1);
        $result = $this->modify($username, $attributes, $isGUID);
        if ($result == false) { return false; }
        
        return true;
    }
    
    /**
    * Set the password of a user - This must be performed over SSL
    * 
    * @param string $username The username to modify
    * @param string $password The new password
    * @param bool $isGUID Is the username passed a GUID or a samAccountName
    * @return bool
    */
    public function password($username, $password, $isGUID = false)
    {
        if ($username === NULL) { return false; }
        if ($password === NULL) { return false; }
        if (!$this->adldap->getLdapBind()) { return false; }
        if (!$this->adldap->getUseSSL() && !$this->adldap->getUseTLS()) { 
            throw new adLDAPException('SSL must be configured on your webserver and enabled in the class to set passwords.');
        }
        
        $userDn = $this->dn($username, $isGUID);
        if ($userDn === false) { 
            return false; 
        }
                
        $add=array();
        $add["unicodePwd"][0] = $this->encodePassword($password);
        
        $result = @ldap_mod_replace($this->adldap->getLdapConnection(), $userDn, $add);
        if ($result === false){
            $err = ldap_errno($this->adldap->getLdapConnection());
            if ($err) {
                $msg = 'Error ' . $err . ': ' . ldap_err2str($err) . '.';
                if($err == 53) {
                    $msg .= ' Your password might not match the password policy.';
                }
                throw new adLDAPException($msg);
            }
            else {
                return false;
            }
        }
        
        return true;
    }
    
    /**
    * Encode a password for transmission over LDAP
    *
    * @param string $password The password to encode
    * @return string
    */
    public function encodePassword($password)
    {
        $password="\"".$password."\"";
        $encoded="";
        for ($i=0; $i <strlen($password); $i++){ $encoded.="{$password{$i}}\000"; }
        return $encoded;
    }
     
    /**
    * Obtain the user's distinguished name based on their userid 
    * 
    * 
    * @param string $username The username
    * @param bool $isGUID Is the username passed a GUID or a samAccountName
    * @return string
    */
    public function dn($username, $isGUID=false)
    {
        $user = $this->info($username, array("cn"), $isGUID);
        if ($user[0]["dn"] === NULL) { 
            return false; 
        }
        $userDn = $user[0]["dn"];
        return $userDn;
    }
    
    /**
    * Return a list of all users in AD
    * 
    * @param bool $includeDescription Return a description of the user
    * @param string $search Search parameter
    * @param bool $sorted Sort the user accounts
    * @return array
    */
    public function all($includeDescription = false, $search = "*", $sorted = true)
    {
        if (!$this->adldap->getLdapBind()) { return false; }
        
        // Perform the search and grab all their details
        $filter = "(&(objectClass=user)(samaccounttype=" . adLDAP::ADLDAP_NORMAL_ACCOUNT .")(objectCategory=person)(cn=" . $search . "))";
        $fields = array("samaccountname","displayname");
        $sr = ldap_search($this->adldap->getLdapConnection(), $this->adldap->getBaseDn(), $filter, $fields);
        $entries = ldap_get_entries($this->adldap->getLdapConnection(), $sr);

        $usersArray = array();
        for ($i=0; $i<$entries["count"]; $i++){
            if ($includeDescription && strlen($entries[$i]["displayname"][0])>0){
                $usersArray[$entries[$i]["samaccountname"][0]] = $entries[$i]["displayname"][0];
            } elseif ($includeDescription){
                $usersArray[$entries[$i]["samaccountname"][0]] = $entries[$i]["samaccountname"][0];
            } else {
                array_push($usersArray, $entries[$i]["samaccountname"][0]);
            }
        }
        if ($sorted) { 
            asort($usersArray); 
        }
        return $usersArray;
    }
    
    /**
    * Converts a username (samAccountName) to a GUID
    * 
    * @param string $username The username to query
    * @return string
    */
    public function usernameToGuid($username) 
    {
        if (!$this->adldap->getLdapBind()){ return false; }
        if ($username === null){ return "Missing compulsory field [username]"; }
        
        $filter = "samaccountname=" . $username; 
        $fields = array("objectGUID"); 
        $sr = @ldap_search($this->adldap->getLdapConnection(), $this->adldap->getBaseDn(), $filter, $fields); 
        if (ldap_count_entries($this->adldap->getLdapConnection(), $sr) > 0) { 
            $entry = @ldap_first_entry($this->adldap->getLdapConnection(), $sr); 
            $guid = @ldap_get_values_len($this->adldap->getLdapConnection(), $entry, 'objectGUID'); 
            $strGUID = $this->adldap->utilities()->binaryToText($guid[0]);          
            return $strGUID; 
        }
        return false; 
    }
    
    /**
    * Return a list of all users in AD that have a specific value in a field
    *
    * @param bool $includeDescription Return a description of the user
    * @param string $searchField Field to search search for
    * @param string $searchFilter Value to search for in the specified field
    * @param bool $sorted Sort the user accounts
    * @return array
    */
    public function find($includeDescription = false, $searchField = false, $searchFilter = false, $sorted = true){
        if (!$this->adldap->getLdapBind()){ return false; }
          
        // Perform the search and grab all their details
        $searchParams = "";
        if ($searchField) {
            $searchParams = "(" . $searchField . "=" . $searchFilter . ")";
        }                           
        $filter = "(&(objectClass=user)(samaccounttype=" . adLDAP::ADLDAP_NORMAL_ACCOUNT .")(objectCategory=person)" . $searchParams . ")";
        $fields = array("samaccountname","displayname");
        $sr = ldap_search($this->adldap->getLdapConnection(), $this->adldap->getBaseDn(), $filter, $fields);
        $entries = ldap_get_entries($this->adldap->getLdapConnection(), $sr);

        $usersArray = array();
        for ($i=0; $i < $entries["count"]; $i++) {
            if ($includeDescription && strlen($entries[$i]["displayname"][0]) > 0) {
                $usersArray[$entries[$i]["samaccountname"][0]] = $entries[$i]["displayname"][0];
            }
            else if ($includeDescription) {
                $usersArray[$entries[$i]["samaccountname"][0]] = $entries[$i]["samaccountname"][0];
            }
            else {
                array_push($usersArray, $entries[$i]["samaccountname"][0]);
            }
        }
        if ($sorted){ 
          asort($usersArray); 
        }
        return ($usersArray);
    }
    
    /**
    * Move a user account to a different OU
    *
    * @param string $username The username to move (please be careful here!)
    * @param array $container The container or containers to move the user to (please be careful here!).
    * accepts containers in 1. parent 2. child order
    * @return array
    */
    public function move($username, $container) 
    {
        if (!$this->adldap->getLdapBind()) { return false; }
        if ($username === null) { return "Missing compulsory field [username]"; }
        if ($container === null) { return "Missing compulsory field [container]"; }
        if (!is_array($container)) { return "Container must be an array"; }
        
        $userInfo = $this->info($username, array("*"));
        $dn = $userInfo[0]['distinguishedname'][0];
        $newRDn = "cn=" . $username;
        $container = array_reverse($container);
        $newContainer = "ou=" . implode(",ou=",$container);
        $newBaseDn = strtolower($newContainer) . "," . $this->adldap->getBaseDn();
        $result = @ldap_rename($this->adldap->getLdapConnection(), $dn, $newRDn, $newBaseDn, true);
        if ($result !== true) {
            return false;
        }
        return true;
    }
    
    /**
    * Get the last logon time of any user as a Unix timestamp
    * 
    * @param string $username
    * @return long $unixTimestamp
    */
    public function getLastLogon($username) {
        if (!$this->adldap->getLdapBind()) { return false; }
        if ($username === null) { return "Missing compulsory field [username]"; }
        $userInfo = $this->info($username, array("lastLogonTimestamp"));
        $lastLogon = adLDAPUtils::convertWindowsTimeToUnixTime($userInfo[0]['lastLogonTimestamp'][0]);
        return $lastLogon;
    }
    
}
?>
