filestore.php

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            foreach ($matching_files as $name) {
                $full_name = $this->association_dir . DIRECTORY_SEPARATOR .
                    $name;
                $association = $this->_getAssociation($full_name);
                if ($association !== null) {
                    $matching_associations[] = array($association->issued,
                                                     $association);
                }
            }

            $issued = array();
            $assocs = array();
            foreach ($matching_associations as $key => $assoc) {
                $issued[$key] = $assoc[0];
                $assocs[$key] = $assoc[1];
            }

            array_multisort($issued, SORT_DESC, $assocs, SORT_DESC,
                            $matching_associations);

            // return the most recently issued one.
            if ($matching_associations) {
                list($issued, $assoc) = $matching_associations[0];
                return $assoc;
            } else {
                return null;
            }
        }
    }

    /**
     * @access private
     */
    function _getAssociation($filename)
    {
        if (!$this->active) {
            trigger_error("FileStore no longer active", E_USER_ERROR);
            return null;
        }

        $assoc_file = @fopen($filename, 'rb');

        if ($assoc_file === false) {
            return null;
        }

        $assoc_s = fread($assoc_file, filesize($filename));
        fclose($assoc_file);

        if (!$assoc_s) {
            return null;
        }

        $association =
            Auth_OpenID_Association::deserialize('Auth_OpenID_Association',
                                                $assoc_s);

        if (!$association) {
            Auth_OpenID_FileStore::_removeIfPresent($filename);
            return null;
        }

        if ($association->getExpiresIn() == 0) {
            Auth_OpenID_FileStore::_removeIfPresent($filename);
            return null;
        } else {
            return $association;
        }
    }

    /**
     * Remove an association if it exists. Do nothing if it does not.
     *
     * @return bool $success
     */
    function removeAssociation($server_url, $handle)
    {
        if (!$this->active) {
            trigger_error("FileStore no longer active", E_USER_ERROR);
            return null;
        }

        $assoc = $this->getAssociation($server_url, $handle);
        if ($assoc === null) {
            return false;
        } else {
            $filename = $this->getAssociationFilename($server_url, $handle);
            return Auth_OpenID_FileStore::_removeIfPresent($filename);
        }
    }

    /**
     * Mark this nonce as present.
     */
    function storeNonce($nonce)
    {
        if (!$this->active) {
            trigger_error("FileStore no longer active", E_USER_ERROR);
            return null;
        }

        $filename = $this->nonce_dir . DIRECTORY_SEPARATOR . $nonce;
        $nonce_file = fopen($filename, 'w');
        if ($nonce_file === false) {
            return false;
        }
        fclose($nonce_file);
        return true;
    }

    /**
     * Return whether this nonce is present. As a side effect, mark it
     * as no longer present.
     *
     * @return bool $present
     */
    function useNonce($nonce)
    {
        if (!$this->active) {
            trigger_error("FileStore no longer active", E_USER_ERROR);
            return null;
        }

        $filename = $this->nonce_dir . DIRECTORY_SEPARATOR . $nonce;
        $st = @stat($filename);

        if ($st === false) {
            return false;
        }

        // Either it is too old or we are using it. Either way, we
        // must remove the file.
        if (!unlink($filename)) {
            return false;
        }

        $now = time();
        $nonce_age = $now - $st[9];

        // We can us it if the age of the file is less than the
        // expiration time.
        return $nonce_age <= $this->max_nonce_age;
    }

    /**
     * Remove expired entries from the database. This is potentially
     * expensive, so only run when it is acceptable to take time.
     */
    function clean()
    {
        if (!$this->active) {
            trigger_error("FileStore no longer active", E_USER_ERROR);
            return null;
        }

        $nonces = Auth_OpenID_FileStore::_listdir($this->nonce_dir);
        $now = time();

        // Check all nonces for expiry
        foreach ($nonces as $nonce) {
            $filename = $this->nonce_dir . DIRECTORY_SEPARATOR . $nonce;
            $st = @stat($filename);

            if ($st !== false) {
                // Remove the nonce if it has expired
                $nonce_age = $now - $st[9];
                if ($nonce_age > $this->max_nonce_age) {
                    Auth_OpenID_FileStore::_removeIfPresent($filename);
                }
            }
        }

        $association_filenames =
            Auth_OpenID_FileStore::_listdir($this->association_dir);

        foreach ($association_filenames as $association_filename) {
            $association_file = fopen($association_filename, 'rb');

            if ($association_file !== false) {
                $assoc_s = fread($association_file,
                                 filesize($association_filename));
                fclose($association_file);

                // Remove expired or corrupted associations
                $association =
                  Auth_OpenID_Association::deserialize(
                         'Auth_OpenID_Association', $assoc_s);

                if ($association === null) {
                    Auth_OpenID_FileStore::_removeIfPresent(
                                                 $association_filename);
                } else {
                    if ($association->getExpiresIn() == 0) {
                        Auth_OpenID_FileStore::_removeIfPresent(
                                                 $association_filename);
                    }
                }
            }
        }
    }

    /**
     * @access private
     */
    function _rmtree($dir)
    {
        if ($dir[strlen($dir) - 1] != DIRECTORY_SEPARATOR) {
            $dir .= DIRECTORY_SEPARATOR;
        }

        if ($handle = opendir($dir)) {
            while ($item = readdir($handle)) {
                if (!in_array($item, array('.', '..'))) {
                    if (is_dir($dir . $item)) {

                        if (!Auth_OpenID_FileStore::_rmtree($dir . $item)) {
                            return false;
                        }
                    } else if (is_file($dir . $item)) {
                        if (!unlink($dir . $item)) {
                            return false;
                        }
                    }
                }
            }

            closedir($handle);

            if (!@rmdir($dir)) {
                return false;
            }

            return true;
        } else {
            // Couldn't open directory.
            return false;
        }
    }

    /**
     * @access private
     */
    function _mkstemp($dir)
    {
        foreach (range(0, 4) as $i) {
            $name = tempnam($dir, "php_openid_filestore_");

            if ($name !== false) {
                return $name;
            }
        }
        return false;
    }

    /**
     * @access private
     */
    function _mkdtemp($dir)
    {
        foreach (range(0, 4) as $i) {
            $name = $dir . strval(DIRECTORY_SEPARATOR) . strval(getmypid()) .
                "-" . strval(rand(1, time()));
            if (!mkdir($name, 0700)) {
                return false;
            } else {
                return $name;
            }
        }
        return false;
    }

    /**
     * @access private
     */
    function _listdir($dir)
    {
        $handle = opendir($dir);
        $files = array();
        while (false !== ($filename = readdir($handle))) {
            $files[] = $filename;
        }
        return $files;
    }

    /**
     * @access private
     */
    function _isFilenameSafe($char)
    {
        $_Auth_OpenID_filename_allowed = Auth_OpenID_letters .
            Auth_OpenID_digits . ".";
        return (strpos($_Auth_OpenID_filename_allowed, $char) !== false);
    }

    /**
     * @access private
     */
    function _safe64($str)
    {
        $h64 = base64_encode(Auth_OpenID_SHA1($str));
        $h64 = str_replace('+', '_', $h64);
        $h64 = str_replace('/', '.', $h64);
        $h64 = str_replace('=', '', $h64);
        return $h64;
    }

    /**
     * @access private
     */
    function _filenameEscape($str)
    {
        $filename = "";
        for ($i = 0; $i < strlen($str); $i++) {
            $c = $str[$i];
            if (Auth_OpenID_FileStore::_isFilenameSafe($c)) {
                $filename .= $c;
            } else {
                $filename .= sprintf("_%02X", ord($c));
            }
        }
        return $filename;
    }

    /**
     * Attempt to remove a file, returning whether the file existed at
     * the time of the call.
     *
     * @access private
     * @return bool $result True if the file was present, false if not.
     */
    function _removeIfPresent($filename)
    {
        return @unlink($filename);
    }
}

?>