<?php
/**
 * EGgroupware admin - Reset passwords
 *
 * @link http://www.egroupware.org
 * @author Ralf Becker <RalfBecker-AT-outdoor-training.de>
 * @package admin
 * @copyright (c) 2011-16 by Ralf Becker <RalfBecker-AT-outdoor-training.de>
 * @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
 * @version $Id$
 */

include_once(EGW_INCLUDE_ROOT.'/setup/inc/hook_config.inc.php');	// functions to return password hashes

use EGroupware\Api;
use EGroupware\Api\Framework;
use EGroupware\Api\Mail\Credentials;
use EGroupware\OpenID\Repositories\AccessTokenRepository;
use EGroupware\WebAuthn\PublicKeyCredentialSourceRepository;

/**
 * Reset passwords
 */
class admin_passwordreset
{
	/**
	 * Which methods of this class can be called as menuation
	 *
	 * @var array
	 */
	public $public_functions = array(
		'index' => true,
	);

	/**
	 * @var array
	 */
	var $replacements = array(
		'lid' => 'LoginID',
		'firstname' => 'first name',
		'lastname' => 'last name',
		'fullname' => 'full name',
		'email' => 'email',
		'password' => 'new password',
		'id' => 'nummeric account ID',
	);

	/**
	 * Constructor
	 *
	 */
	function __construct()
	{
		if($GLOBALS['egw']->acl->check('account_access',16,'admin'))
		{
			$GLOBALS['egw']->redirect_link('/index.php');
		}
	}

	/**
	 * Reset passwords
	 *
	 * @param ?array $content =null
	 * @param string $msg =''
	 */
	function index(?array $content=null, $msg='')
	{

		// Setup if opened as a dialog
		$content['dialog'] = $_GET['dialog'] ?? null;
		if($content['dialog'] && empty($content['users']) && isset($_GET['ids']))
		{
			$content['users'] = $_GET['ids'];

			$query = Api\Cache::getSession('admin', 'account_list');
			if($_GET['select_all'] == 'true')
			{
				@set_time_limit(0);            // switch off the execution time limit, as it's for big selections to small
				$query['num_rows'] = false;       // all
				$query['start'] = 0;
				$readonlys = null;
				$content['users'] = [];
				$rows = [];
				admin_ui::get_users($query, $rows);
				foreach($rows as $row)
				{
					$content['users'][] = $row['account_id'];
				}
			}
		}
		if (!($account_repository = $GLOBALS['egw_info']['server']['account_repository']) &&
			!($account_repository = $GLOBALS['egw_info']['server']['auth_type']))
		{
			$account_repository = 'sql';
		}
		if (!($current_hash = $GLOBALS['egw_info']['server'][$account_repository.'_encryption_type']))
		{
			$current_hash = 'md5';
		}
		if (is_array($content) && !isset($_GET['dialog']))
		{
			if ($content['download_csv'] && $content['changed'])
			{
				Api\Header\Content::type('changed.csv', 'text/csv');
				//echo "account_lid;account_password;account_email;account_firstname;account_lastname\n";
				foreach($content['changed'] as $account)
				{
					echo "$account[account_lid];$account[account_password];$account[account_email];$account[account_firstname];$account[account_lastname]\n";
				}
				exit;
			}
			if (!$content['users'])
			{
				$msg = lang('You need to select some users first!');
			}
			elseif (!$content['random_pw'] && !$content['hash'] && !$content['notify'] &&
				(string)$content['changepassword'] === '' && (string)$content['mustchangepassword'] === '' &&
				(string)$content['mail']['activate'] === '' && (string)$content['mail']['quota'] === '' &&
				strpos($content['mail']['domain'], '.') === false)
			{
				$msg = lang('You need to select as least one action!');
			}
			elseif(!$content['random_pw'] && $content['hash'] && $content['hash'] != $current_hash && $current_hash != 'plain')
			{
				$msg = lang('You can only change the hash, if you set a random password or currently use plaintext passwords!');
			}
			else
			{
				if ($content['hash'] && $content['hash'] != $current_hash)
				{
					Api\Config::save_value($account_repository.'_encryption_type',$content['hash'],'phpgwapi');
					$msg = lang('Changed password hash for %1 to %2.',strtoupper($account_repository),$content['hash'])."\n";
					$GLOBALS['egw_info']['server'][$account_repository.'_encryption_type'] = $content['hash'];
				}
				$change_pw = $content['random_pw'] || $content['hash'] && $content['hash'] != $current_hash;
				$changed = array();
				$emailadmin = null;
				foreach($content['users'] as $account_id)
				{
					$result = $this->resetAccount($account_id, $content, $change_pw, $current_hash, $msg, $changed);
					if($result === false)
					{
						break;
					}
				}
				if ($changed)
				{
					$msg .= lang('Passwords and/or attributes of %1 accounts changed',count($changed));
				}
			}
		}
		$content['msg'] = $msg;
		$content['account_repository'] = $account_repository;
		$content['current_hash'] = $content['hash'] ? $content['hash'] : $current_hash;
		$sel_options['hash'] = $account_repository == 'sql' ?
			sql_passwdhashes($GLOBALS['egw_info']['server'],true) :
			passwdhashes($GLOBALS['egw_info']['server'],true);
		$sel_options['activate'] = array('Deactivate','Activate');

		// Start with same message as last time
		$config = Api\Config::read('admin');
		$message = $config['password_reset_message'];
		$content['subject'] = $message['subject'];
		$content['body'] = $message['body'];

		$content['replacements'] = array();
		foreach($this->replacements as $name => $label)
		{
			$content['replacements'][] = array(
				'name'  => '$$'.$name.'$$',
				'label' => $label,
			);
		}
		$readonlys['download_csv'] = !$changed;

		$GLOBALS['egw_info']['flags']['app_header'] = lang('Bulk password reset');

		$tmpl = new Api\Etemplate('admin.passwordreset');
		$tmpl->exec('admin.admin_passwordreset.index',$content,$sel_options,$readonlys,array(
			'changed' => $changed,
			'dialog'  => $content['dialog'],
		), 2 * !empty($content['dialog']));
	}

	protected function resetAccount($account_id, $content, $change_pw, $current_hash, &$msg, &$changed)
	{
		if(($account = $GLOBALS['egw']->accounts->read($account_id)))
		{
			if($content['group'])
			{
				$GLOBALS['egw']->accounts->set_memberships(array_merge(array_keys($account['memberships']), $content['group']), $account_id);
			}
			if($content['random_pw'])
			{
				if(($minlength = $GLOBALS['egw_info']['server']['force_pwd_length']) < 8)
				{
					$minlength = 8;
				}
				$n = 0;
				do
				{
					$password = Api\Auth::randomstring($minlength,
													   $GLOBALS['egw_info']['server']['force_pwd_strength'] >= 4
					);
					error_log(__METHOD__ . "() minlength=$minlength, n=$n, password=$password");
				}
				while(++$n < 100 && Api\Auth::crackcheck($password, null, null, null, $account));
				$old_password = null;
			}
			elseif($change_pw && !preg_match('/^{plain}/i', $account['account_pwd']) &&
				($current_hash != 'plain' || $current_hash == 'plain' && $account['account_pwd'][0] == '{'))
			{
				$msg .= lang('Account "%1" has NO plaintext password!', $account['account_lid']) . "\n";
				return;
			}
			else
			{
				$old_password = $password = preg_replace('/^{plain}/i', '', $account['account_pwd']);
			}
			// change password, if requested
			try
			{
				if($change_pw && !$GLOBALS['egw']->auth->change_password($old_password, $password, $account_id))
				{
					$msg .= lang('Failed to change password for account "%1"!', $account['account_lid']) . "\n";
					return;
				}
			}
			catch (Exception $e)
			{
				$msg .= lang('Failed to change password for account "%1"!', $account['account_lid']) . ' ' . $e->getMessage() . "\n";
				return;
			}
			// force password change on next login
			if((string)$content['mustchangepassword'] !== '' && !(!$content['mustchangepassword'] && $change_pw))
			{
				// dont use password here, as the use of passwords indicates the usage of the functionality in usermode
				$GLOBALS['egw']->auth->setLastPwdChange($account_id, null, $content['mustchangepassword'] ? 0 : time());
			}
			// allow or forbid to change password, if requested
			if((string)$content['changepassword'] !== '')
			{
				if(!$content['changepassword'])
				{
					$GLOBALS['egw']->acl->add_repository('preferences', 'nopasswordchange', $account_id, 1);
				}
				else
				{
					$GLOBALS['egw']->acl->delete_repository('preferences', 'nopasswordchange', $account_id);
				}
			}
			$account['account_password'] = $password;

			if((string)$content['mail']['activate'] !== '' || (string)$content['mail']['quota'] !== '' ||
				strpos($content['mail']['domain'], '.') !== false)
			{
				if(!isset($emailadmin))
				{
					$emailadmin = Api\Mail\Account::get_default();
					if(!Api\Mail\Account::is_multiple($emailadmin))
					{
						$msg = lang('No default account found!');
						return false;
					}
				}
				if(($userData = $emailadmin->getUserData($account_id)))
				{
					if((string)$content['mail']['activate'] !== '')
					{
						$userData['accountStatus'] = $content['mail']['activate'] ? 'active' : '';
					}
					if((string)$content['mail']['quota'] !== '')
					{
						$userData['quotaLimit'] = $content['mail']['quota'];
					}
					if(strpos($content['mail']['domain'], '.') !== false)
					{
						$userData['mailLocalAddress'] = preg_replace('/@' . preg_quote($emailadmin->acc_domain) . '$/', '@' . $content['mail']['domain'], $userData['mailLocalAddress']);

						foreach($userData['mailAlternateAddress'] as &$alias)
						{
							$alias = preg_replace('/@' . preg_quote($emailadmin->acc_domain) . '$/', '@' . $content['mail']['domain'], $alias);
						}
					}
					$emailadmin->saveUserData($account_id, $userData);
				}
				else
				{
					$msg .= lang('No profile defined for user %1', '#' . $account_id . ' ' . $account['account_fullname'] . "\n");
					return;
				}
			}
			$changed[] = $account;

			if($content['notify'])
			{
				if(strpos($account['account_email'], '@') === false)
				{
					$msg .= lang('Account "%1" has no email address --> not notified!', $account['account_lid']);
					return;
				}
				$send = new Api\Mailer();
				$send->AddAddress($account['account_email'], $account['account_fullname']);
				$replacements = array();
				foreach($this->replacements as $name => $label)
				{
					$replacements['$$' . $name . '$$'] = $account['account_' . $name];
				}
				$send->addHeader('Subject', strtr($content['subject'], $replacements));
				$send->setBody(strtr($content['body'], $replacements));
				if(!empty($GLOBALS['egw_info']['user']['account_email']))
				{
					$send->addHeader('From', Api\Mailer::add_personal(
						$GLOBALS['egw_info']['user']['account_email'],
						$GLOBALS['egw_info']['user']['account_fullname']
					)
					);
				}
				try
				{
					$send->Send();
				}
				catch (Exception $e)
				{
					$msg .= lang('Notifying account "%1" %2 failed!', $account['account_lid'], $account['account_email']) .
						': ' . strip_tags(str_replace('<p>', "\n", $e->getMessage())) . "\n";
				}
			}
		}
	}

	public function ajax_clear_credentials($action_id, $account_ids, $etemplate_exec_id)
	{
		$msg = [];

		// check we have a valid etemplate_exec_id / CSRF token
		Api\Etemplate\Request::csrfCheck($etemplate_exec_id, __METHOD__, func_get_args());

		if($action_id == 'clear_mail')
		{
			$count = Api\Mail\Credentials::delete(0,$account_ids, Credentials::IMAP|Credentials::SMTP|Credentials::SMIME);
			$msg[] = lang("%1 mail credentials deleted", $count);
		}

		$action['action'] = 'delete';
		$action['selected'] = $account_ids;
		$hook_data = array();

		if($action_id == 'clear_2fa')
		{
			if (Credentials::delete(0, $account_ids, Credentials::TWOFA))
			{
				$msg[] = lang('Secret deleted, two factor authentication disabled.');
			}
			$hook_data = Api\Hooks::process(array('location' => 'preferences_security'), ['openid'], true);
		}
		foreach($hook_data as $extra_tab)
		{
			if($extra_tab['delete'])
			{
				$msg[] = call_user_func_array($extra_tab['delete'], [$account_ids]);
			}
			else
			{
				switch ($extra_tab['name'])
				{
					case 'openid.access_tokens':
						// We need to get all access tokens, no easy way to delete by account
						$token_repo = new AccessTokenRepository();
						$token_repo->revokeAccessToken(['account_id' => $action['selected']]);
						$count = $GLOBALS['egw']->db->affected_rows();
						$msg[] = ($count > 1 ? $count.' ' : '') .  lang('Access Token revoked.');
						break;
					case 'webauthn.tokens':
						$token_repo = new PublicKeyCredentialSourceRepository();
						$count = $token_repo->delete(['account_id' => $action['selected']]);
						$msg[] = ($count > 1 ? $count.' ' : '') . lang($extra_tab['label']) . ' ' . lang('deleted');
						break;
					default:
						// Each credential / security option can have its nm as a different ID
						$content['tabs'] = $extra_tab['name'];
						foreach($extra_tab['data'] as $id => $datum)
						{
							if(is_array($datum) && array_key_exists('get_rows',$datum))
							{
								$content[$id] = $action;
							}
						}
					$msg[] = call_user_func_array($extra_tab['save_callback'], [$content]);
				}
			}
		}
		Api\Json\Response::get()->message(implode("\n", $msg), 'success');
	}

	public function ajax_reset($content)
	{
		$msg = '';
		$changed = [];

		// check we have a valid etemplate_exec_id / CSRF token
		Api\Etemplate\Request::csrfCheck($content['values']['etemplate_exec_id'], __METHOD__, func_get_args());

		// Save message for next time
		if(!empty($content['values']['subject']))
		{
			Api\Config::save_value(
				'password_reset_message', [
				'subject' => $content['values']['subject'],
				'body'    => $content['values']['body']],
				'admin'
			);
		}

		if(!($account_repository = $GLOBALS['egw_info']['server']['account_repository']) &&
			!($account_repository = $GLOBALS['egw_info']['server']['auth_type']))
		{
			$account_repository = 'sql';
		}
		if(!($current_hash = $GLOBALS['egw_info']['server'][$account_repository . '_encryption_type']))
		{
			$current_hash = 'md5';
		}
		$change_pw = $content['random_pw'] || $content['hash'] && $content['hash'] != $current_hash;

		$result = $this->resetAccount($content['user'], $content['values'], $change_pw, $current_hash, $msg, $changed);

		if(count($changed) == 1)
		{
			Api\Json\Response::get()->data($msg !== "" ? $msg : $GLOBALS['egw']->accounts->id2name($content['user']));
		}
		else
		{
			Api\Json\Response::get()->error($msg);
		}

	}
}