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File: RewriteSimpleHelper.class
<?php
/*
 * Gallery - a web based photo album viewer and editor
 * Copyright (C) 2000-2007 Bharat Mediratta
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or (at
 * your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA  02110-1301, USA.
 */

/**
 * This class provides basic URL keyword functions
 * @package Rewrite
 * @subpackage Classes
 * @author Douglas Cau <douglas@cau.se>
 * @version $Revision: 15513 $
 * @static
 */
class RewriteSimpleHelper {

    /**
     * This is an onLoad function called by RewriteUrlGenerator::init if there's a path keyword
     * that needs to be parsed to an itemId. Used by other modules that has %path%.
     *
     * @return object GalleryStatus a status code
     */
    function loadItemIdFromPath() {
	list ($path, $itemId) = GalleryUtilities::getRequestVariables('path', 'itemId');

	if (!empty($path) && empty($itemId)) {
	    if (substr($path, -5) == '.html') {
		$path = substr($path, 0, -5);
	    }

	    list ($ret, $itemId) = GalleryCoreApi::fetchItemIdByPath($path);
	    if ($ret) {
		return $ret;
	    }
	    GalleryUtilities::putRequestVariable('itemId', $itemId);
	}

	return null;
    }

    /**
     * Replace the keyword with expected value.
     *
     * @param string $url url passed by reference
     * @param array $params of url params passed by reference
     * @param object GalleryEntity $entity loaded entity with item id = $params['itemId'], or null
     * @return boolean true on success
     */
    function parsePath(&$url, &$params, &$entity) {
	global $gallery;
	$urlGenerator =& $gallery->getUrlGenerator();

	if (!isset($entity) && ($entity = $urlGenerator->loadEntity($params['itemId'])) == null
		|| !GalleryUtilities::isA($entity, 'GalleryFileSystemEntity')) {
	    return false;
	}
	list ($ret, $path) = $entity->fetchLogicalPath();
	if ($ret) {
	    return false;
	}

	/* We don't provide short URLs for the root album */
	if ($path == '/') {
	    return false;
	}

	if (substr($url, -6) != '%path%') {
	    $path = rtrim($path, '/');
	} else if (!GalleryUtilities::isA($entity, 'GalleryAlbumItem')) {
	    /* Append .html suffix on non-album paths if rule has no suffix */
	    $path .= '.html';
	}

	/* urlencode except for path separators(/) */
	$url = str_replace('%path%',
	    str_replace('%2F', '/', urlencode(substr($path, 1))), $url);
	unset($params['itemId']);
	/* If the generated url is built by old request variables unset the old path */
	unset($params['path']);
	return true;
    }

    /**
     * @see RewriteSimpleHelper::parsePath
     */
    function parsePage(&$url, &$params, &$entity) {
	$page = isset($params['page']) ? $params['page'] : '';
	$url = str_replace('%page%', $page, $url);
	unset($params['page']);
	return true;
    }

    /**
     * @see RewriteSimpleHelper::parsePath
     */
    function parseLanguage(&$url, &$params, &$entity) {
	global $gallery;
	$urlGenerator =& $gallery->getUrlGenerator();

	if (empty($urlGenerator->_language)) {
	    list ($ret, $activeLanguage) = $gallery->getActiveLanguageCode();
	    if ($ret) {
		return false;
	    }

	    $language = explode('_', $activeLanguage);

	    if (isset($language[0]) && isset($language[1])) {
		list ($defaultLanguageCode, $null) =
		    GalleryTranslator::getSupportedLanguageCode($language[0], false);
		if ($defaultLanguageCode == $activeLanguage) {
		    unset($language[1]);
		}
	    }

	    $urlGenerator->_language = join('_', $language);
	}

	$url = str_replace('%language%', $urlGenerator->_language, $url);
	return true;
    }

    /**
     * @see RewriteSimpleHelper::parsePath
     */
    function parseSerialNumber(&$url, &$params, &$entity) {
	global $gallery;
	$urlGenerator =& $gallery->getUrlGenerator();

	if (!isset($entity) && ($entity = $urlGenerator->loadEntity($params['itemId'])) == null) {
	    return false;
	}
	$url = str_replace('%serialNumber%', $entity->getSerialNumber(), $url);
	unset($params['serialNumber']);
	return true;
    }

    /**
     * @see RewriteSimpleHelper::parsePath
     */
    function parseFileName(&$url, &$params, &$entity)  {
	global $gallery;
	$urlGenerator =& $gallery->getUrlGenerator();

	if (!isset($entity) && ($entity = $urlGenerator->loadEntity($params['itemId'])) == null) {
	    return false;
	}
	list ($ret, $pseudoFileName) = GalleryUtilities::getPseudoFileName($entity);
	if ($ret) {
	    return false;
	}
	$url = str_replace('%fileName%', urlencode($pseudoFileName), $url);
	return true;
    }
}
?>