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<?php

/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4 foldmethod=marker: */

/**

 * Storage driver for use against PEAR MDB2

 *

 * PHP versions 4 and 5

 *

 * LICENSE: This source file is subject to version 3.01 of the PHP license

 * that is available through the world-wide-web at the following URI:

 * http://www.php.net/license/3_01.txt.  If you did not receive a copy of

 * the PHP License and are unable to obtain it through the web, please

 * send a note to license@php.net so we can mail you a copy immediately.

 *

 * @category   Authentication

 * @package    Auth

 * @author     Lorenzo Alberton <l.alberton@quipo.it>

 * @author     Adam Ashley <aashley@php.net>

 * @copyright  2001-2006 The PHP Group

 * @license    http://www.php.net/license/3_01.txt  PHP License 3.01

 * @version    CVS: $Id: MDB2.php,v 1.1 2006-12-14 15:04:28 jp_milcent Exp $

 * @link       http://pear.php.net/package/Auth

 * @since      File available since Release 1.3.0

 */

/**

 * Include Auth_Container base class

 */

require_once 'Auth/Container.php';

/**

 * Include PEAR MDB2 package

 */

require_once 'MDB2.php';

/**

 * Storage driver for fetching login data from a database

 *

 * This storage driver can use all databases which are supported

 * by the PEAR MDB2 abstraction layer to fetch login data.

 *

 * @category   Authentication

 * @package    Auth

 * @author     Lorenzo Alberton <l.alberton@quipo.it>

 * @author     Adam Ashley <aashley@php.net>

 * @copyright  2001-2006 The PHP Group

 * @license    http://www.php.net/license/3_01.txt  PHP License 3.01

 * @version    Release: 1.4.3  File: $Revision: 1.1 $

 * @link       http://pear.php.net/package/Auth

 * @since      Class available since Release 1.3.0

 */

class Auth_Container_MDB2 extends Auth_Container

{

    // {{{ properties

    /**

     * Additional options for the storage container

     * @var array

     */

    var $options = array();

    /**

     * MDB object

     * @var object

     */

    var $db = null;

    var $dsn = '';

    /**

     * User that is currently selected from the DB.

     * @var string

     */

    var $activeUser = '';

    // }}}

    // {{{ Auth_Container_MDB2() [constructor]

    /**

     * Constructor of the container class

     *

     * Initate connection to the database via PEAR::MDB2

     *

     * @param  string Connection data or MDB2 object

     * @return object Returns an error object if something went wrong

     */

    function Auth_Container_MDB2($dsn)

    {

        $this->_setDefaults();

        if (is_array($dsn)) {

            $this->_parseOptions($dsn);

            if (empty($this->options['dsn'])) {

                PEAR::raiseError('No connection parameters specified!');

            }

        } else {

            $this->options['dsn'] = $dsn;

        }

    }

    // }}}

    // {{{ _connect()

    /**

     * Connect to database by using the given DSN string

     *

     * @access private

     * @param  mixed DSN string | array | mdb object

     * @return mixed  Object on error, otherwise bool

     */

    function _connect($dsn)

    {

        if (is_string($dsn) || is_array($dsn)) {

            $this->db =& MDB2::connect($dsn, $this->options['db_options']);

        } elseif (is_subclass_of($dsn, 'MDB2_Driver_Common')) {

            $this->db = $dsn;

        } elseif (is_object($dsn) && MDB2::isError($dsn)) {

            return PEAR::raiseError($dsn->getMessage(), $dsn->code);

        } else {

            return PEAR::raiseError('The given dsn was not valid in file ' . __FILE__ . ' at line ' . __LINE__,

                                    41,

                                    PEAR_ERROR_RETURN,

                                    null,

                                    null

                                    );

        }

        if (MDB2::isError($this->db) || PEAR::isError($this->db)) {

            return PEAR::raiseError($this->db->getMessage(), $this->db->code);

        }

        if ($this->options['auto_quote']) {

            $this->options['final_table'] = $this->db->quoteIdentifier($this->options['table'], true);

            $this->options['final_usernamecol'] = $this->db->quoteIdentifier($this->options['usernamecol'], true);

            $this->options['final_passwordcol'] = $this->db->quoteIdentifier($this->options['passwordcol'], true);

        } else {

            $this->options['final_table'] = $this->options['table'];

            $this->options['final_usernamecol'] = $this->options['usernamecol'];

            $this->options['final_passwordcol'] = $this->options['passwordcol'];

        }

        return true;

    }

    // }}}

    // {{{ _prepare()

    /**

     * Prepare database connection

     *

     * This function checks if we have already opened a connection to

     * the database. If that's not the case, a new connection is opened.

     *

     * @access private

     * @return mixed True or a MDB error object.

     */

    function _prepare()

    {

        if (is_subclass_of($this->db, 'MDB2_Driver_Common')) {

            return true;

        }

        return $this->_connect($this->options['dsn']);

    }

    // }}}

    // {{{ query()

    /**

     * Prepare query to the database

     *

     * This function checks if we have already opened a connection to

     * the database. If that's not the case, a new connection is opened.

     * After that the query is passed to the database.

     *

     * @access public

     * @param  string Query string

     * @return mixed  a MDB_result object or MDB_OK on success, a MDB

     *                or PEAR error on failure

     */

    function query($query)

    {

        $err = $this->_prepare();

        if ($err !== true) {

            return $err;

        }

        return $this->db->exec($query);

    }

    // }}}

    // {{{ _setDefaults()

    /**

     * Set some default options

     *

     * @access private

     * @return void

     */

    function _setDefaults()

    {

        $this->options['table']       = 'auth';

        $this->options['usernamecol'] = 'username';

        $this->options['passwordcol'] = 'password';

        $this->options['dsn']         = '';

        $this->options['db_fields']   = '';

        $this->options['cryptType']   = 'md5';

        $this->options['db_options']  = array();

        $this->options['auto_quote']  = true;

    }

    // }}}

    // {{{ _parseOptions()

    /**

     * Parse options passed to the container class

     *

     * @access private

     * @param  array

     */

    function _parseOptions($array)

    {

        foreach ($array as $key => $value) {

            if (isset($this->options[$key])) {

                $this->options[$key] = $value;

            }

        }

    }

    // }}}

    // {{{ _quoteDBFields()

    /**

     * Quote the db_fields option to avoid the possibility of SQL injection.

     *

     * @access private

     * @return string A properly quoted string that can be concatenated into a

     * SELECT clause.

     */

    function _quoteDBFields()

    {

        if (isset($this->options['db_fields'])) {

            if (is_array($this->options['db_fields'])) {

                if ($this->options['auto_quote']) {

                    $fields = array();

                    foreach ($this->options['db_fields'] as $field) {

                        $fields[] = $this->db->quoteIdentifier($field, true);

                    }

                    return implode(', ', $fields);

                } else {

                    return implode(', ', $this->options['db_fields']);

                }

            } else {

                if (strlen($this->options['db_fields']) > 0) {

                    if ($this->options['auto_quote']) {

                        return $this->db->quoteIdentifier($this->options['db_fields'], true);

                    } else {

                        return $this->options['db_fields'];

                    }

                }

            }

        }

        return '';

    }

    // }}}

    // {{{ fetchData()

    /**

     * Get user information from database

     *

     * This function uses the given username to fetch

     * the corresponding login data from the database

     * table. If an account that matches the passed username

     * and password is found, the function returns true.

     * Otherwise it returns false.

     *

     * @param   string Username

     * @param   string Password

     * @param   boolean If true password is secured using a md5 hash

     *                  the frontend and auth are responsible for making sure the container supports

     *                  challenge response password authentication

     * @return  mixed  Error object or boolean

     */

    function fetchData($username, $password, $isChallengeResponse=false)

    {

        // Prepare for a database query

        $err = $this->_prepare();

        if ($err !== true) {

            return PEAR::raiseError($err->getMessage(), $err->getCode());

        }

        //Check if db_fields contains a *, if so assume all columns are selected

        if (is_string($this->options['db_fields'])

            && strstr($this->options['db_fields'], '*')) {

            $sql_from = '*';

        } else {

            $sql_from = $this->options['final_usernamecol'].

                ", ".$this->options['final_passwordcol'];

            if (strlen($fields = $this->_quoteDBFields()) > 0) {

                $sql_from .= ', '.$fields;

            }

        }

        $query = sprintf("SELECT %s FROM %s WHERE %s = %s",

                         $sql_from,

                         $this->options['final_table'],

                         $this->options['final_usernamecol'],

                         $this->db->quote($username, 'text')

                         );

        $res = $this->db->queryRow($query, null, MDB2_FETCHMODE_ASSOC);

        if (MDB2::isError($res) || PEAR::isError($res)) {

            return PEAR::raiseError($res->getMessage(), $res->getCode());

        }

        if (!is_array($res)) {

            $this->activeUser = '';

            return false;

        }

        // Perform trimming here before the hashing

        $password = trim($password, "\r\n");

        $res[$this->options['passwordcol']] = trim($res[$this->options['passwordcol']], "\r\n");

        // If using Challenge Response md5 the pass with the secret

        if ($isChallengeResponse) {

            $res[$this->options['passwordcol']] =

                md5($res[$this->options['passwordcol']].$this->_auth_obj->session['loginchallenege']);

            // UGLY cannot avoid without modifying verifyPassword

            if ($this->options['cryptType'] == 'md5') {

                $res[$this->options['passwordcol']] = md5($res[$this->options['passwordcol']]);

            }

        }

        if ($this->verifyPassword($password,

                                  $res[$this->options['passwordcol']],

                                  $this->options['cryptType'])) {

            // Store additional field values in the session

            foreach ($res as $key => $value) {

                if ($key == $this->options['passwordcol'] ||

                    $key == $this->options['usernamecol']) {

                    continue;

                }

                // Use reference to the auth object if exists

                // This is because the auth session variable can change so a static call to setAuthData does not make sense

                $this->_auth_obj->setAuthData($key, $value);

            }

            return true;

        }

        $this->activeUser = $res[$this->options['usernamecol']];

        return false;

    }

    // }}}

    // {{{ listUsers()

    /**

     * Returns a list of users from the container

     *

     * @return mixed array|PEAR_Error

     * @access public

     */

    function listUsers()

    {

        $err = $this->_prepare();

        if ($err !== true) {

            return PEAR::raiseError($err->getMessage(), $err->getCode());

        }

        $retVal = array();

        //Check if db_fields contains a *, if so assume all columns are selected

        if (   is_string($this->options['db_fields'])

            && strstr($this->options['db_fields'], '*')) {

            $sql_from = '*';

        } else {

            $sql_from = $this->options['final_usernamecol'].

                ", ".$this->options['final_passwordcol'];

            if (strlen($fields = $this->_quoteDBFields()) > 0) {

                $sql_from .= ', '.$fields;

            }

        }

        $query = sprintf('SELECT %s FROM %s',

                         $sql_from,

                         $this->options['final_table']

                         );

        $res = $this->db->queryAll($query, null, MDB2_FETCHMODE_ASSOC);

        if (MDB2::isError($res)) {

            return PEAR::raiseError($res->getMessage(), $res->getCode());

        } else {

            foreach ($res as $user) {

                $user['username'] = $user[$this->options['usernamecol']];

                $retVal[] = $user;

            }

        }

        return $retVal;

    }

    // }}}

    // {{{ addUser()

    /**

     * Add user to the storage container

     *

     * @access public

     * @param  string Username

     * @param  string Password

     * @param  mixed  Additional information that are stored in the DB

     *

     * @return mixed True on success, otherwise error object

     */

    function addUser($username, $password, $additional = "")

    {

        // Prepare for a database query

        $err = $this->_prepare();

        if ($err !== true) {

            return PEAR::raiseError($err->getMessage(), $err->getCode());

        }

        if (isset($this->options['cryptType']) && $this->options['cryptType'] == 'none') {

            $cryptFunction = 'strval';

        } elseif (isset($this->options['cryptType']) && function_exists($this->options['cryptType'])) {

            $cryptFunction = $this->options['cryptType'];

        } else {

            $cryptFunction = 'md5';

        }

        $password = $cryptFunction($password);

        $additional_key   = '';

        $additional_value = '';

        if (is_array($additional)) {

            foreach ($additional as $key => $value) {

                if ($this->options['auto_quote']) {

                    $additional_key   .= ', ' . $this->db->quoteIdentifier($key, true);

                } else {

                    $additional_key   .= ', ' . $key;

                }

                $additional_value .= ', ' . $this->db->quote($value, 'text');

            }

        }

        $query = sprintf("INSERT INTO %s (%s, %s%s) VALUES (%s, %s%s)",

                         $this->options['final_table'],

                         $this->options['final_usernamecol'],

                         $this->options['final_passwordcol'],

                         $additional_key,

                         $this->db->quote($username, 'text'),

                         $this->db->quote($password, 'text'),

                         $additional_value

                         );

        $res = $this->query($query);

        if (MDB2::isError($res)) {

            return PEAR::raiseError($res->getMessage(), $res->code);

        }

        return true;

    }

    // }}}

    // {{{ removeUser()

    /**

     * Remove user from the storage container

     *

     * @access public

     * @param  string Username

     *

     * @return mixed True on success, otherwise error object

     */

    function removeUser($username)

    {

        // Prepare for a database query

        $err = $this->_prepare();

        if ($err !== true) {

            return PEAR::raiseError($err->getMessage(), $err->getCode());

        }

        $query = sprintf("DELETE FROM %s WHERE %s = %s",

                         $this->options['final_table'],

                         $this->options['final_usernamecol'],

                         $this->db->quote($username, 'text')

                         );

        $res = $this->query($query);

        if (MDB2::isError($res)) {

            return PEAR::raiseError($res->getMessage(), $res->code);

        }

        return true;

    }

    // }}}

    // {{{ changePassword()

    /**

     * Change password for user in the storage container

     *

     * @param string Username

     * @param string The new password (plain text)

     */

    function changePassword($username, $password)

    {

        // Prepare for a database query

        $err = $this->_prepare();

        if ($err !== true) {

            return PEAR::raiseError($err->getMessage(), $err->getCode());

        }

        if (isset($this->options['cryptType']) && $this->options['cryptType'] == 'none') {

            $cryptFunction = 'strval';

        } elseif (isset($this->options['cryptType']) && function_exists($this->options['cryptType'])) {

            $cryptFunction = $this->options['cryptType'];

        } else {

            $cryptFunction = 'md5';

        }

        $password = $cryptFunction($password);

        $query = sprintf("UPDATE %s SET %s = %s WHERE %s = %s",

                         $this->options['final_table'],

                         $this->options['final_passwordcol'],

                         $this->db->quote($password, 'text'),

                         $this->options['final_usernamecol'],

                         $this->db->quote($username, 'text')

                         );

        $res = $this->query($query);

        if (MDB2::isError($res)) {

            return PEAR::raiseError($res->getMessage(), $res->code);

        }

        return true;

    }

    // }}}

    // {{{ supportsChallengeResponse()

    /**

     * Determine if this container supports

     * password authentication with challenge response

     *

     * @return bool

     * @access public

     */

    function supportsChallengeResponse()

    {

        return in_array($this->options['cryptType'], array('md5', 'none', ''));

    }

    // }}}

    // {{{ getCryptType()

    /**

     * Returns the selected crypt type for this container

     *

     * @return string Function used to crypt the password

     */

    function getCryptType()

    {

        return $this->options['cryptType'];

    }

    // }}}

}

?>