<?php

class Account
{
	static function sync ($db, $user, $password = NULL)
	{
		$hasAccount = $db->getValue (
			'SELECT COUNT(*) > 0
				FROM account.user u
					JOIN account.account a ON u.id = a.id
				WHERE u.name = #',
			[$user]
		);
		
		if (!$hasAccount)
			return;

		$conf = $db->getRow (
			'SELECT sambaHost, homesHost, sshUser, sshPass
				FROM account.accountConfig'
		);
		$sshPass = base64_decode ($conf['sshPass']);
			
		$samba = new SshConnection ($conf['sambaHost']
			,$conf['sshUser']
			,$sshPass
		);
		$homes = new SshConnection ($conf['homesHost']
			,$conf['sshUser']
			,$sshPass
		);

		$escUser = SshConnection::escape ($user);

		// Creates the Samba user and initializes it's home directory

		$userId = $db->getValue (
			'SELECT id FROM account.user WHERE name = #', [$user]);
		$accConf = $db->getRow (
			'SELECT uidBase, domain FROM account.accountConfig');

		$escUid = SshConnection::escape ($accConf['uidBase'] + $userId);
		$escMail = SshConnection::escape ("$user@{$accConf['domain']}");

		$samba->exec (
			"/mnt/cluster/scripts/create-user.sh $escUser $escUid $escMail");
		$homes->exec (
			"/mnt/storage/scripts/create-user.sh $escUser");

		// Syncronizes the Samba password

		if (empty ($password))
			return;

		$escPassword = SshConnection::escape ($password);
		$samba->exec (
			"/mnt/cluster/scripts/set-password.sh $escUser $escPassword");

		new SshConnection ($conf['homesHost'], $user, $password);
	}
}

class SshConnection
{
	var $connection;

	/**
	 * Abrebiated method to make SSH connections.
	 **/
	function __construct ($host, $user, $password)
	{
		$this->connection = $connection = ssh2_connect ($host);

		if (!$connection)
			throw new Exception ("Can't connect to SSH server $host");
		
		$authOk = ssh2_auth_password ($connection, $user, $password);

		if (!$authOk)
			throw new Exception ("SSH authentication failed on server $host");
			
		return $connection;
	}
	
	/**
	 * Executes a command on the host.
	 **/
	function exec ($command)
	{
		return ssh2_exec ($this->connection, $command);
	}
	
	/**
	 * Escapes the double quotes from an string.
	 **/
	static function escape ($str)
	{
		return '"'. str_replace ('"', '\\"', $str) .'"';
	}
}