filestore.php

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        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            trigger_error("FileStore no longer active", E_USER_ERROR);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);
        }
    }

    /**
     * Return whether this nonce is present. As a side effect, mark it
     * as no longer present.
     *
     * @return bool $present
     */
    function useNonce($server_url, $timestamp, $salt)
    {
        global $Auth_OpenID_SKEW;

        if (!$this->active) {
            trigger_error("FileStore no longer active", E_USER_ERROR);
            return null;
        }

        if ( abs($timestamp - mktime()) > $Auth_OpenID_SKEW ) {
            return False;
        }

        if ($server_url) {
            list($proto, $rest) = explode('://', $server_url, 2);
        } else {
            $proto = '';
            $rest = '';
        }

        $parts = explode('/', $rest, 2);
        $domain = $this->_filenameEscape($parts[0]);
        $url_hash = $this->_safe64($server_url);
        $salt_hash = $this->_safe64($salt);

        $filename = sprintf('%08x-%s-%s-%s-%s', $timestamp, $proto,
                            $domain, $url_hash, $salt_hash);
        $filename = $this->nonce_dir . DIRECTORY_SEPARATOR . $filename;

        $result = @fopen($filename, 'x');

        if ($result === false) {
            return false;
        } else {
            fclose($result);
            return true;
        }
    }

    /**
     * Remove expired entries from the database. This is potentially
     * expensive, so only run when it is acceptable to take time.
     *
     * @access private
     */
    function _allAssocs()
    {
        $all_associations = array();

        $association_filenames =
            Auth_OpenID_FileStore::_listdir($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) {
                        $all_associations[] = array($association_filename,
                                                    $association);
                    }
                }
            }
        }

        return $all_associations;
    }

    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 $nonce) {
            if (!Auth_OpenID_checkTimestamp($nonce, $now)) {
                $filename = $this->nonce_dir . DIRECTORY_SEPARATOR . $nonce;
                Auth_OpenID_FileStore::_removeIfPresent($filename);
            }
        }

        foreach ($this->_allAssocs() as $pair) {
            list($assoc_filename, $assoc) = $pair;
            if ($assoc->getExpiresIn() == 0) {
                Auth_OpenID_FileStore::_removeIfPresent($assoc_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($handle))) {
            if (!in_array($filename, array('.', '..'))) {
                $files[] = $dir . DIRECTORY_SEPARATOR . $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 = "";
        $b = Auth_OpenID::toBytes($str);

        for ($i = 0; $i < count($b); $i++) {
            $c = $b[$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);
    }

    function cleanupAssociations()
    {
        $removed = 0;
        foreach ($this->_allAssocs() as $pair) {
            list($assoc_filename, $assoc) = $pair;
            if ($assoc->getExpiresIn() == 0) {
                $this->_removeIfPresent($assoc_filename);
                $removed += 1;
            }
        }
        return $removed;
    }
}

?>