<?php/** * This is the PHP OpenID library by JanRain, Inc. * * This module contains core utility functionality used by the * library.  See Consumer.php and Server.php for the consumer and * server implementations. * * PHP versions 4 and 5 * * LICENSE: See the COPYING file included in this distribution. * * @package OpenID * @author JanRain, Inc. <openid@janrain.com> * @copyright 2005 Janrain, Inc. * @license http://www.gnu.org/copyleft/lesser.html LGPL *//** * Require the fetcher code. */require_once "Auth/Yadis/PlainHTTPFetcher.php";require_once "Auth/Yadis/ParanoidHTTPFetcher.php";require_once "Auth/OpenID/BigMath.php";/** * Status code returned by the server when the only option is to show * an error page, since we do not have enough information to redirect * back to the consumer. The associated value is an error message that * should be displayed on an HTML error page. * * @see Auth_OpenID_Server */define('Auth_OpenID_LOCAL_ERROR', 'local_error');/** * Status code returned when there is an error to return in key-value * form to the consumer. The caller should return a 400 Bad Request * response with content-type text/plain and the value as the body. * * @see Auth_OpenID_Server */define('Auth_OpenID_REMOTE_ERROR', 'remote_error');/** * Status code returned when there is a key-value form OK response to * the consumer. The value associated with this code is the * response. The caller should return a 200 OK response with * content-type text/plain and the value as the body. * * @see Auth_OpenID_Server */define('Auth_OpenID_REMOTE_OK', 'remote_ok');/** * Status code returned when there is a redirect back to the * consumer. The value is the URL to redirect back to. The caller * should return a 302 Found redirect with a Location: header * containing the URL. * * @see Auth_OpenID_Server */define('Auth_OpenID_REDIRECT', 'redirect');/** * Status code returned when the caller needs to authenticate the * user. The associated value is a {@link Auth_OpenID_ServerRequest} * object that can be used to complete the authentication. If the user * has taken some authentication action, use the retry() method of the * {@link Auth_OpenID_ServerRequest} object to complete the request. * * @see Auth_OpenID_Server */define('Auth_OpenID_DO_AUTH', 'do_auth');/** * Status code returned when there were no OpenID arguments * passed. This code indicates that the caller should return a 200 OK * response and display an HTML page that says that this is an OpenID * server endpoint. * * @see Auth_OpenID_Server */define('Auth_OpenID_DO_ABOUT', 'do_about');/** * Defines for regexes and format checking. */define('Auth_OpenID_letters',       "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ");define('Auth_OpenID_digits',       "0123456789");define('Auth_OpenID_punct',       "!\"#$%&'()*+,-./:;<=>?@[\\]^_`{|}~");if (Auth_OpenID_getMathLib() === null) {    Auth_OpenID_setNoMathSupport();}/** * The OpenID utility function class. * * @package OpenID * @access private */class Auth_OpenID {    /**     * Return true if $thing is an Auth_OpenID_FailureResponse object;     * false if not.     *     * @access private     */    function isFailure($thing)    {        return is_a($thing, 'Auth_OpenID_FailureResponse');    }    /**     * Gets the query data from the server environment based on the     * request method used.  If GET was used, this looks at     * $_SERVER['QUERY_STRING'] directly.  If POST was used, this     * fetches data from the special php://input file stream.     *     * Returns an associative array of the query arguments.     *     * Skips invalid key/value pairs (i.e. keys with no '=value'     * portion).     *     * Returns an empty array if neither GET nor POST was used, or if     * POST was used but php://input cannot be opened.     *     * @access private     */    function getQuery($query_str=null)    {        $data = array();        if ($query_str !== null) {            $data = Auth_OpenID::params_from_string($query_str);        } else if (!array_key_exists('REQUEST_METHOD', $_SERVER)) {            // Do nothing.        } else {          // XXX HACK FIXME HORRIBLE.          //          // POSTing to a URL with query parameters is acceptable, but          // we don't have a clean way to distinguish those parameters          // when we need to do things like return_to verification          // which only want to look at one kind of parameter.  We're          // going to emulate the behavior of some other environments          // by defaulting to GET and overwriting with POST if POST          // data is available.          $data = Auth_OpenID::params_from_string($_SERVER['QUERY_STRING']);          if ($_SERVER['REQUEST_METHOD'] == 'POST') {            $str = file_get_contents('php://input');            if ($str === false) {              $post = array();            } else {              $post = Auth_OpenID::params_from_string($str);            }            $data = array_merge($data, $post);          }        }        return $data;    }    function params_from_string($str)    {        $chunks = explode("&", $str);        $data = array();        foreach ($chunks as $chunk) {            $parts = explode("=", $chunk, 2);            if (count($parts) != 2) {                continue;            }            list($k, $v) = $parts;            $data[$k] = urldecode($v);        }        return $data;    }    /**     * Create dir_name as a directory if it does not exist. If it     * exists, make sure that it is, in fact, a directory.  Returns     * true if the operation succeeded; false if not.     *     * @access private     */    function ensureDir($dir_name)    {        if (is_dir($dir_name) || @mkdir($dir_name)) {            return true;        } else {            if (Auth_OpenID::ensureDir(dirname($dir_name))) {                return is_dir($dir_name) || @mkdir($dir_name);            } else {                return false;            }        }    }    /**     * Adds a string prefix to all values of an array.  Returns a new     * array containing the prefixed values.     *     * @access private     */    function addPrefix($values, $prefix)    {        $new_values = array();        foreach ($values as $s) {            $new_values[] = $prefix . $s;        }        return $new_values;    }    /**     * Convenience function for getting array values.  Given an array     * $arr and a key $key, get the corresponding value from the array     * or return $default if the key is absent.     *     * @access private     */    function arrayGet($arr, $key, $fallback = null)    {        if (is_array($arr)) {            if (array_key_exists($key, $arr)) {                return $arr[$key];            } else {                return $fallback;            }        } else {            trigger_error("Auth_OpenID::arrayGet (key = ".$key.") expected " .                          "array as first parameter, got " .                          gettype($arr), E_USER_WARNING);            return false;        }    }    /**     * Replacement for PHP's broken parse_str.     */    function parse_str($query)    {        if ($query === null) {            return null;        }        $parts = explode('&', $query);        $new_parts = array();        for ($i = 0; $i < count($parts); $i++) {            $pair = explode('=', $parts[$i]);            if (count($pair) != 2) {                continue;            }            list($key, $value) = $pair;            $new_parts[$key] = urldecode($value);        }        return $new_parts;    }    /**     * Implements the PHP 5 'http_build_query' functionality.     *     * @access private     * @param array $data Either an array key/value pairs or an array     * of arrays, each of which holding two values: a key and a value,     * sequentially.     * @return string $result The result of url-encoding the key/value     * pairs from $data into a URL query string     * (e.g. "username=bob&id=56").     */    function httpBuildQuery($data)