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<?php
//
+-----------------------------------------------------------------------+
// | Copyright (c) 2002-2003 Richard Heyes                                
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// | All rights reserved.                                                 
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// |                                                                      
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// | Redistribution and use in source and binary forms, with or without   
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// | modification, are permitted provided that the following conditions   
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// | are met:                                                             
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// |                                                                      
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// | o Redistributions of source code must retain the above copyright     
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// |   notice, this list of conditions and the following disclaimer.      
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// | o Redistributions in binary form must reproduce the above copyright  
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// |   notice, this list of conditions and the following disclaimer in the
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// |   documentation and/or other materials provided with the
distribution.|
// | o The names of the authors may not be used to endorse or promote     
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// |   products derived from this software without specific prior written 
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// |   permission.                                                        
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// |                                                                      
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// | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS  
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// | "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
BUT NOT     |
// | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// | A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 
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// | OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// | SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT     
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// | LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// | DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// | THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT  
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// | (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// | OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
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// |                                                                      
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//
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// | Author: Richard Heyes <richard@php.net>                         
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//
+-----------------------------------------------------------------------+
//
// $Id$

/**
* Client implementation of various SASL mechanisms
*
* @author  Richard Heyes <richard@php.net>
* @access  public
* @version 1.0
* @package Auth_SASL
*/

require_once('PEAR.php');

class Auth_SASL
{
    /**
    * Factory class. Returns an object of the request
    * type.
    *
    * @param string $type One of: Anonymous
    *                             Plain
    *                             CramMD5
    *                             DigestMD5
    *                             SCRAM-* (any mechanism of the SCRAM
family)
    *                     Types are not case sensitive
    */
    public static function factory($type)
    {
        switch (strtolower($type)) {
            case 'anonymous':
                $filename  = 'Auth/SASL/Anonymous.php';
                $classname = 'Auth_SASL_Anonymous';
                break;

            case 'login':
                $filename  = 'Auth/SASL/Login.php';
                $classname = 'Auth_SASL_Login';
                break;

            case 'plain':
                $filename  = 'Auth/SASL/Plain.php';
                $classname = 'Auth_SASL_Plain';
                break;

            case 'external':
                $filename  = 'Auth/SASL/External.php';
                $classname = 'Auth_SASL_External';
                break;

            case 'crammd5':
                // $msg = 'Deprecated mechanism name. Use
IANA-registered name: CRAM-MD5.';
                // trigger_error($msg, E_USER_DEPRECATED);
            case 'cram-md5':
                $filename  = 'Auth/SASL/CramMD5.php';
                $classname = 'Auth_SASL_CramMD5';
                break;

            case 'digestmd5':
                // $msg = 'Deprecated mechanism name. Use
IANA-registered name: DIGEST-MD5.';
                // trigger_error($msg, E_USER_DEPRECATED);
            case 'digest-md5':
                // $msg = 'DIGEST-MD5 is a deprecated SASL mechanism
as per RFC-6331. Using it could be a security risk.';
                // trigger_error($msg, E_USER_NOTICE);
                $filename  = 'Auth/SASL/DigestMD5.php';
                $classname = 'Auth_SASL_DigestMD5';
                break;

            default:
                $scram = '/^SCRAM-(.{1,9})$/i';
                if (preg_match($scram, $type, $matches))
                {
                    $hash = $matches[1];
                    $filename = dirname(__FILE__)
.'/SASL/SCRAM.php';
                    $classname = 'Auth_SASL_SCRAM';
                    $parameter = $hash;
                    break;
                }
                return PEAR::raiseError('Invalid SASL mechanism
type');
                break;
        }

        require_once($filename);
        if (isset($parameter))
            $obj = new $classname($parameter);
        else
            $obj = new $classname();
        return $obj;
    }
}

?>