<?php
/**
 * eGgroupWare setup - test or create the ldap connection and hierarchy
 *
 * @link http://www.egroupware.org
 * @author Ralf Becker <RalfBecker-AT-outdoor-training.de>
 * @package setup
 * @copyright (c) 2007 by Ralf Becker <RalfBecker-AT-outdoor-training.de>
 * @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
 * @version $Id$ 
 */

/**
 * setup command: test or create the ldap connection and hierarchy
 */
class setup_cmd_ldap extends setup_cmd 
{
	/**
	 * Instance of ldap object
	 *
	 * @var ldap
	 */
	private $test_ldap;

	/**
	 * Constructor
	 *
	 * @param string/array $domain domain-name to customize the defaults or array with all parameters
	 * @param string $ldap_type db-type (mysql, pgsql, ...)
	 * @param string $ldap_host=null
	 * @param string $ldap_suffix=null base of the whole ldap install, default "dc=local"
	 * @param string $ldap_admin=null root-dn needed to create new entries in the suffix
	 * @param string $ldap_admin_pw=null
	 * @param string $ldap_base=null base of the instance, default "o=$domain,$suffix"
	 * @param string $ldap_root=null root-dn used for the instance, default "cn=admin,$base"
	 * @param string $ldap_root_pw=null
	 * @param string $ldap_context=null ou for accounts, default "ou=accounts,$base"
	 * @param string $ldap_search_filter=null search-filter for accounts, default "(uid=%user)"
	 * @param string $ldap_context_group=null ou for groups, default "ou=groups,$base"
	 * @param string $sub_command='create_ldap' 'create_ldap', 'test_ldap', 'test_ldap_root'
	 */
	function __construct($domain,$ldap_host=null,$ldap_suffix=null,$ldap_admin=null,$ldap_admin_pw=null,
		$ldap_base=null,$ldap_root=null,$ldap_root_pw=null,$ldap_context=null,$ldap_search_filter=null,
		$ldap_context_group=null,$sub_command='create_ldap')
	{
		if (!is_array($domain))
		{
			$data = array(
				'domain'        => $domain,
				'ldap_host'     => $ldap_host,
				'ldap_suffix'   => $ldap_suffix,
				'ldap_admin'    => $ldap_admin,
				'ldap_admin_pw' => $ldap_admin_pw,
				'ldap_base'     => $ldap_base,
				'ldap_root'     => $ldap_root,
				'ldap_root_pw'  => $ldap_root_pw,
				'ldap_context'  => $ldap_context,
				'ldap_search_filter' => $ldap_search_filter,
				'ldap_context_group' => $ldap_context_group,
				'sub_command'   => $sub_command
			);
		}
		//echo __CLASS__.'::__construct()'; _debug_array($domain);
		admin_cmd::__construct($domain);
	}

	/**
	 * test or create database
	 * 
	 * @param boolean $check_only=false only run the checks (and throw the exceptions), but not the command itself
	 * @return string serialized $GLOBALS defined in the header.inc.php
	 * @throws Exception(lang('Wrong credentials to access the header.inc.php file!'),2);
	 * @throws Exception('header.inc.php not found!');
	 */
	protected function exec($check_only=false)
	{
		if (!empty($this->domain) && !preg_match('/^([a-z0-9_-]+\.)*[a-z0-9]+/i',$this->domain))
		{
			throw new egw_exception_wrong_userinput(lang("'%1' is no valid domain name!",$this->domain));
		}
		if ($this->remote_id && $check_only) return true;	// further checks can only done locally

		$this->_merge_defaults();
		//_debug_array($this->as_array());

		try {
			switch($this->sub_command)
			{
				case 'test_ldap_root':
					$msg = $this->connect($this->ldap_admin,$this->ldap_admin_pw);
					break;
				case 'test_ldap':
					$msg = $this->connect();
					break;
				case 'create_ldap':
				default:
					$msg = $this->create();
					break;
			}
		}
		catch (Exception $e) {
			// we catch the exception to properly restore the db
		}
		$this->restore_db();
		
		if ($e)
		{
			throw $e;
		}
		return $msg;
	}
	
	/**
	 * Connect to ldap server
	 *
	 * @param string $dn=null default $this->ldap_root
	 * @param string $pw=null default $this->ldap_root_pw
	 * @throws egw_exception_wrong_userinput Can not connect to ldap ...
	 */
	private function connect($dn=null,$pw=null)
	{
		if (is_null($dn)) $dn = $this->ldap_root;
		if (is_null($pw)) $pw = $this->ldap_root_pw;
		
		if (!$pw)	// ldap::ldapConnect use the current eGW's pw otherwise
		{
			throw new egw_exception_wrong_userinput(lang('You need to specify a password!'));
		}
		$this->test_ldap = new ldap();
		
		$error_rep = error_reporting();
		//error_reporting($error_rep & ~E_WARNING);	// switch warnings of, in case they are on
		ob_start();
		$ds = $this->test_ldap->ldapConnect($this->ldap_host,$dn,$pw);
		ob_end_clean();
		error_reporting($error_rep);
		
		if (!$ds)
		{
			throw new egw_exception_wrong_userinput(lang('Can not connect to LDAP server on host %1 using DN %2!',
				$this->ldap_host,$dn).($this->test_ldap->ds ? ' ('.ldap_error($this->test_ldap->ds).')' : ''));
		}
		return lang('Successful connected to LDAP server on %1 using DN %2.',$this->ldap_host,$dn);
	}
	
	/**
	 * Check and if does not yet exist create the new database and user
	 *
	 * The check will fail if the database exists, but already contains tables
	 * 
	 * @return string with success message
	 * @throws egw_exception_wrong_userinput
	 */
	private function create()
	{
		$this->connect($this->ldap_admin,$this->ldap_admin_pw);
		
		foreach(array(
			$this->ldap_base => array(),
			$this->ldap_context => array(),
			$this->ldap_context_group => array(),
			$this->ldap_root => array('userPassword' => '{crypt}'.crypt($this->ldap_root_pw)),
		) as $dn => $extra)
		{
			if (!$this->_create_node($dn,$extra,$check_only) && $dn == $this->ldap_root)
			{
				// ldap_root already existed, lets check the pw is correct
				$this->connect();
			}
		}
		return lang('Successful connected to LDAP server on %1 and created/checked required structur %2.',
			$this->ldap_host,$this->ldap_base);
	}
	
	/**
	 * array with objectclasses for the objects we can create
	 *
	 * @var array of name => objectClass pairs (or array with multiple)
	 */
	static $requiredObjectclasses = array(
		'o' => 'organization',
		'ou' => 'organizationalUnit',
		'cn' => array('namedObject','simpleSecurityObject'),
		'dc' => array('organization','dcObject'),
	);

	/**
	 * Create a new node in the ldap tree
	 *
	 * @param string $dn dn to create, eg. "cn=admin,dc=local"
	 * @param array $extra=array() extra attributes to set
	 * @return boolean true if the node was create, false if it was already there
	 * @throws egw_exception_wrong_userinput
	 */
	private function _create_node($dn,$extra=array())
	{
		//echo "<p>_create_node($dn,".print_r($extra,true).")</p>\n";
		// check if the node already exists and return if it does
		if (@ldap_read($this->test_ldap->ds,$dn,'objectClass=*'))
		{
			return false;
		}
		list($node,$base) = explode(',',$dn,2);
		
		if (!@ldap_read($this->test_ldap->ds,$base,'objectClass=*'))
		{
			$this->_create_node($base);		// create the base if it's not already there
		}
		// now we need to create the node itself
		list($name,$value) = explode('=',$node);
		
		if (!isset(self::$requiredObjectclasses[$name]))
		{
			throw new egw_exception_wrong_userinput(lang('Can not create DN %1!',$dn).' '.
				lang('Supported node types:').implode(', ',array_keys(self::$requiredObjectclasses)));
		}
		if ($name == 'dc') $extra['o'] = $value;	// required by organisation

		if (!@ldap_add($this->test_ldap->ds,$dn,$attr = array(
			$name => $value,
			'objectClass' => self::$requiredObjectclasses[$name],
		)+$extra))
		{
			throw new egw_exception_wrong_userinput(lang('Can not create DN %1!',$dn).
				' ('.ldap_error($this->test_ldap->ds).', attributes='.print_r($attr,true).')');
		}
		return true;
	}

	/**
	 * Return default database settings for a given domain
	 *
	 * @return array
	 */
	static function defaults()
	{
		return array(
			'ldap_host'     => 'localhost',
			'ldap_suffix'   => 'dc=local',
			'ldap_admin'    => 'cn=admin,$suffix',
			'ldap_admin_pw' => '',
			'ldap_base'     => 'o=$domain,$suffix',
			'ldap_root'     => 'cn=admin,$base',
			'ldap_root_pw'  => md5(microtime(true).$domain.session_id()),
			'ldap_context'  => 'ou=accounts,$base',
			'ldap_search_filter' => '(uid=%user)',
			'ldap_context_group' => 'ou=groups,$base',
		);
	}

	/**
	 * Merges the default into the current properties, if they are empty or contain placeholders
	 */
	private function _merge_defaults()
	{
		foreach(self::defaults($this->domain) as $name => $default)
		{
			if (!$this->$name)
			{
				//echo "<p>setting $name='{$this->$name}' to it's default='$default'</p>\n";
				$this->set_defaults[$name] = $this->$name = $default;
			}
			if (strpos($this->$name,'$') !== false)
			{
				$this->$name = str_replace(array(
					'$domain',
					'$suffix',
					'$base',
				),array(
					$this->domain,
					$this->ldap_suffix,
					$this->ldap_base,
				),$this->$name);
			}
		}	
	}
}