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<?php
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/**
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 * Helper files for HTTP_Request2 unit tests. Should be accessible via HTTP.
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 *
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 * PHP version 5
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 *
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 * LICENSE:
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 *
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 * Copyright (c) 2008-2011, Alexey Borzov <avb@php.net>
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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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 *    * 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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 *    * 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.
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 *    * The names of the authors may not be used to endorse or promote products
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 *      derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 *
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 * @category   HTTP
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 * @package    HTTP_Request2
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 * @author     Alexey Borzov <avb@php.net>
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 * @license    http://opensource.org/licenses/bsd-license.php New BSD License
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 * @version    SVN: $Id: digestauth.php 308300 2011-02-13 12:24:18Z avb $
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 * @link       http://pear.php.net/package/HTTP_Request2
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 */
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/**
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 * Mostly borrowed from PHP manual and Socket Adapter implementation
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 *
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 * @link http://php.net/manual/en/features.http-auth.php
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 */
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/**
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 * Parses the Digest auth header
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 *
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 * @param string $txt
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 */
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function http_digest_parse($txt)
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{
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    $token  = '[^\x00-\x1f\x7f-\xff()<>@,;:\\\\"/\[\]?={}\s]+';
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    $quoted = '"(?:\\\\.|[^\\\\"])*"';
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    // protect against missing data
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    $needed_parts = array_flip(array('nonce', 'nc', 'cnonce', 'qop', 'username', 'uri', 'response'));
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    $data         = array();
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    preg_match_all("!({$token})\\s*=\\s*({$token}|{$quoted})!", $txt, $matches);
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    for ($i = 0; $i < count($matches[0]); $i++) {
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        // ignore unneeded parameters
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        if (isset($needed_parts[$matches[1][$i]])) {
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            unset($needed_parts[$matches[1][$i]]);
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            if ('"' == substr($matches[2][$i], 0, 1)) {
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                $data[$matches[1][$i]] = substr($matches[2][$i], 1, -1);
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            } else {
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                $data[$matches[1][$i]] = $matches[2][$i];
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            }
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        }
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    }
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    return !empty($needed_parts) ? false : $data;
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}
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$realm      = 'HTTP_Request2 tests';
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$wantedUser = isset($_GET['user']) ? $_GET['user'] : null;
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$wantedPass = isset($_GET['pass']) ? $_GET['pass'] : null;
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$validAuth  = false;
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if (!empty($_SERVER['PHP_AUTH_DIGEST'])
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    && ($data = http_digest_parse($_SERVER['PHP_AUTH_DIGEST']))
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    && $wantedUser == $data['username']
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) {
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    // generate the valid response
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    $a1       = md5($data['username'] . ':' . $realm . ':' . $wantedPass);
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    $a2       = md5($_SERVER['REQUEST_METHOD'] . ':' . $data['uri']);
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    $response = md5($a1. ':' . $data['nonce'] . ':' . $data['nc'] . ':'
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                    . $data['cnonce'] . ':' . $data['qop'] . ':' . $a2);
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    // check valid response against existing one
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    $validAuth = ($data['response'] == $response);
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}
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if (!$validAuth || empty($_SERVER['PHP_AUTH_DIGEST'])) {
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    header('WWW-Authenticate: Digest realm="' . $realm .
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           '",qop="auth",nonce="' . uniqid() . '"', true, 401);
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    echo "Login required";
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} else {
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    echo "Username={$user}";
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}
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?>