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Path: /data/applications/aps/gallery/2.2-08/standard/htdocs/modules/rss/classes/ [ Home ]
File: RssHelper.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.
 */

/*
 * Check if the comments module exists and load GalleryCommentHelper in that case, which is used to
 * retrieve comments from the database for comments rss feeds.
 * @todo Don't access GalleryCommentHelper directly
 */
if (GalleryPlatform::file_exists(dirname(__FILE__)
	    . '/../../comment/classes/GalleryCommentHelper.class')) {
    GalleryCoreApi::requireOnce('modules/comment/classes/GalleryCommentHelper.class');
}

/**
 * Helper class for the RSS module
 * @package Rss
 * @subpackage Classes
 * @author Jonatan Heyman <http://heyman.info>
 * @author Pierre-Luc Paour
 * @author Daniel Grund <http://www.photogrund.nl>
 * @version $Revision: 15513 $
 * @static
 */
class RssHelper {
    /**
     * This function takes an RssGenerator as a pass-by-reference variable and adds gallery item
     * data to it, so that an rss feed can be generated.
     *
     * @param object RssGenerator $generator object that will get the data.
     * @param int $id Id of the album from where the photoitems shall be retrieved.
     * @param array $params Additional parameters.
     * @return object GalleryStatus
     */
    function getFeed(&$generator, $id, $param) {
	global $gallery;

	/* get gallery entity by id */
	list ($ret, $entity) = GalleryCoreApi::loadEntitiesById($id);
	if ($ret) {
	    return $ret;
	}

	/* get member data for the <channel> properties */
	$memberData = (array) $entity;

	/* generate url to the album and rss feed */
	$urlGenerator =& $gallery->getUrlGenerator();
	$albumUrl = $urlGenerator->generateUrl(
	    array(
		'view' => 'core.ShowItem',
		'itemId' => $memberData['id']),
	    array(
		'forceSessionId' => false,
		'forceFullUrl' => true));

	$generator->addProperty('title', $memberData['title']);
	$generator->addProperty('description', $memberData['description']);
	$generator->addProperty('link', $albumUrl);

	if ($param['useImage']) {
	    /* retrieve gallery thumbnail */
	    list ($ret, $thumbArrayl) = GalleryCoreApi::fetchThumbnailsByItemIds(array($id));
	    if ($ret) {
		return $ret;
	    }

	    /* check if image tag should be used */
	    if (!empty($thumbArrayl)) {
		$thumb = $thumbArrayl[$id];
		$imageUrl = $urlGenerator->generateUrl(
		    array(
			'view' => 'core.DownloadItem',
			'itemId' => $thumb->getId()),
		    array(
			'forceSessionId' => false,
			'forceFullUrl' => true));

		$generator->addProperty('image', array('title' => $memberData['title'],
		    'url' => $imageUrl, 'link' => $albumUrl));
	    }
	}

	/* check if the cloud tag should be used */
	if ($param['useCloud']) {
	    $cloud = array('domain' => $param['cloudDomain'],
			   'port' => $param['cloudPort'],
			   'path' => $param['cloudPath'],
			   'registerProcedure' => $param['cloudRegisterProcedure'],
			   'protocol' => $param['cloudProtocol']);
	    $generator->addProperty('cloud', $cloud);
	}

	/* add copyright, category and generator */
	if (isset($param['copyright'])) {
	    $generator->addProperty('copyright', $param['copyright']);
	}
	if (isset($param['category'])) {
	    $generator->addProperty('category', $param['category']);
	}
	list ($ret, $version) =
	    GalleryCoreApi::getPluginParameter('module', 'rss', '_version');
	$generator->addProperty('generator', 'Gallery 2 RSS Module, version ' . $version);
	$generator->addProperty('ttl', $param['ttl']);
	$vm = $gallery->getPhpVm();
	$generator->addProperty('lastBuildDate', date('r', $vm->time()));

	/* language tag */
	$generator->addProperty('language', $param['language']);

	$items = array();
	$newOnly = ($param['feedDate'] == 'new');

	switch ($param['feedType']) {
	    case 'album':
	    case 'photosRecurse':
		/* get sub-albums or items, ordered by date */
		list ($ret, $items) = RssHelper::fetchAlbumTree(
		    $entity->getId(),
		    $param['count'],
		    $newOnly,
		    $param['feedType'] != 'album',
		    $param['feedType'] == 'photosRecurse'?$param['photosRecurseLimit']:0);
		if ($ret) {
		    return $ret;
		}

		if (!empty($items)) {
		    list ($ret, $items) = GalleryCoreApi::loadEntitiesById($items);
		    if ($ret) {
			return $ret;
		    }

		    if ($param['feedType'] == 'photosRecurse') {
			/* load parents also, so we can display the name of the parent albums */
			$parentIds = array();

			foreach ($items as $item) {
			    if (!in_array($item->getParentId(), $parentIds)) {
				$parentIds[] = $item->getParentId();
			    }
			}

			list ($ret, $parents) = GalleryCoreApi::loadEntitiesById($parentIds);
			if ($ret) {
			    return $ret;
			}

			$parentsA = array();
			foreach ($parents as $parent) {
			    $parentsA[$parent->getId()] = $parent;
			}

			$param['parents'] = $parentsA;
		    }
		}

		break;

	    case 'photos':
		list ($ret, $items) = RssHelper::getPhotoFeed($entity, $newOnly);
		if ($ret) {
		    return $ret;
		}

		break;

	    case 'commentsAlbum':
	    case 'commentsPhoto':
		list ($ret, $items) = GalleryCommentHelper::fetchComments($id,
		    $param['count'], ORDER_DESCENDING);
		if ($ret) {
		    return $ret;
		}

		break;
	    case 'commentsRecursive':
		list ($ret, $items) = GalleryCommentHelper::fetchAllComments($id,
		    $param['count'], null, ORDER_DESCENDING);
		if ($ret) {
		    return $ret;
		}

		break;
	}

	/* go through subitems array and pass data to generator */
	if (!empty($items)) {
	    foreach ($items as $item) {
		$ret = RssHelper::addItem($generator, $item, $param);

		if ($ret) {
		    return $ret;
		}
	    }
	}

	return null;
    }

    /**
     * This function retrieves photos and put them in an array.
     *
     * @param object GalleryAlbumItem $entity Album that we shall retrieve photos/comments from.
     * @return array object GalleryStatus
     *               array  creationTimeStamp => GalleryItem
     */
    function getPhotoFeed($entity, $newOnly) {
	/* retrieve subitems' ids */
	list ($ret, $subIds) = GalleryCoreApi::fetchChildItemIds($entity);
	if ($ret) {
	    return array($ret, null);
	}

	$itemsAcc = array();
	$sortParam = $newOnly ? 'creationTimestamp' : 'modificationTimestamp';

	/* go through subitems array and pass data to generator */
	if (!empty($subIds)) {
	    /* retrieve array of subitems */
	    list ($ret, $subItems) = GalleryCoreApi::loadEntitiesById($subIds);
	    if ($ret) {
		return array($ret, null);
	    }

	    foreach ($subItems as $key => $subItem) {
		/* check if the subitem is a photo */
		if (GalleryUtilities::isA($subItem, 'GalleryDataItem')) {
		    $itemData = (array) $subItem;
		    $key = $itemData[$sortParam] . '_' . $itemData['id'];
		    $itemsAcc[$key] = $subItem;
		}
	    }
	}

	krsort($itemsAcc);

	return array(null, $itemsAcc);
    }

    /**
     * This function adds an item to the feed generator
     *
     * @param object RssGenerator $generator reference to the generator
     * @param object GalleryEntity $item item to add
     * @param array $param feed parameters
     * @return object GalleryStatus
     */
    function addItem(&$generator, $item, $param) {
	if (GalleryUtilities::isA($item, 'GalleryDataItem')
		|| GalleryUtilities::isA($item, 'GalleryAlbumItem')) {
	    return RssHelper::addPhotoOrAlbum($generator, $item, $param);
	} else if (GalleryUtilities::isA($item, 'GalleryComment')) {
	    return RssHelper::addComment($generator, $item, $param);
	} else {
	    return GalleryCoreApi::error(ERROR_INVALID_OBJECT);
	}
    }

    /**
     * This function adds a photo or an album item to the feed generator
     *
     * @param object RssGenerator $generator reference to the generator
     * @param object GalleryItem $item item to add
     * @param array $param feed parameters
     * @return object GalleryStatus
     */
    function addPhotoOrAlbum(&$generator, $item, $param) {
	global $gallery;

	/* generate url to the images */
	$urlGenerator =& $gallery->getUrlGenerator();
	$url = $urlGenerator->generateUrl(
	    array('view' => 'core.ShowItem', 'itemId' => $item->getId()),
	    array('forceSessionId' => false, 'forceFullUrl' => true));

	/* generate description */
	$description = $item->getDescription();
	if (!isset($description)) {
	    $description = '';
	}

	list ($ret, $thumbnails) = GalleryCoreApi::fetchThumbnailsByItemIds(array($item->getId()));
	if ($ret) {
	    return $ret;
	}

	if (!empty($thumbnails) && !empty($thumbnails[$item->getId()])) {
	    $thumbnail = $thumbnails[$item->getId()];
	    $imageUrl = $urlGenerator->generateUrl(
		array(
		    'view' => 'core.DownloadItem',
		    'itemId' => $thumbnail->getId()),
		array(
		    'forceSessionId' => false,
		    'forceFullUrl' => true));

	    $description = '<a href="' . $url .'"><img border="0" src="' . $imageUrl .
		'" width="' . $thumbnail->getWidth() .
		'" height="' . $thumbnail->getHeight() .
		'"/></a>' . (!empty($description) ? '<br/>' . $description : $description);
	}

	if ($param['feedType'] == 'photosRecurse') {
	    /* add a link to the parent album */
	    list ($ret, $module) = GalleryCoreApi::loadPlugin('module', 'rss');
	    if ($ret) {
		return $ret;
	    }

	    $url1 = $urlGenerator->generateUrl(
		array('view' => 'core.ShowItem', 'itemId' => $item->getParentId()),
		array('forceSessionId' => false, 'forceFullUrl' => true));

	    $description .= '<br/>' . $module->translate(
		array('text' => 'In album <a href="%s">%s</a>',
		'arg1' => $url1,
		'arg2' => $param['parents'][$item->getParentId()]->getTitle()));
	}

	$title = $item->getTitle();
	if (!isset($title)) {
	    $title = $item->getPathComponent();
	}

	$itemSettings = array('title' => $title,
			      'link' => $url,
			      'description' => $description);

	if (GalleryUtilities::isA($item, 'GalleryAlbumItem')) {
	    $itemSettings['category'] = 'album';
	} else {
	    $itemSettings['category'] = 'photo';
	}

	$itemSettings['pubDate'] = date('r', $item->getModificationTimestamp());

	/* check if the enclosure tag should be used */
	if (GalleryUtilities::isA($item, 'GalleryDataItem')
		&& isset($param['useEnclosure'])
		&& $param['useEnclosure'] == '1') {
	    $imageUrl = $urlGenerator->generateUrl(
		array(
		    'view' => 'core.DownloadItem',
		    'itemId' => $item->getId()),
		array(
		    'forceSessionId' => false,
		    'forceFullUrl' => true));
	    $itemSettings['enclosure'] = array(
		'url' => $imageUrl,
		'length' => $item->getSize(),
		'type' => $item->getMimeType());
	}

	$generator->addItem($itemSettings, $item->getId());

	return null;
    }

    /**
     * This function adds a comment item to the feed generator
     *
     * @param object RssGenerator $generator reference to the generator
     * @param object GalleryComment $item item to add
     * @param array $param feed parameters
     * @return object GalleryStatus
     */
    function addComment(&$generator, $item, $param) {
	global $gallery;

	/* generate url to the images */
	$urlGenerator =& $gallery->getUrlGenerator();
	$url = $urlGenerator->generateUrl(
	    array('view' => 'comment.ShowAllComments', 'itemId' => $item->getParentId()),
	    array('forceSessionId' => false, 'forceFullUrl' => true));

	$itemSettings = array(
	    'title' => $item->getSubject(),
	    'link' => $url,
	    'description' => $item->getComment());

	/* check if we should use the category tag */
	if (isset($param['useItemCategory']) && $param['useItemCategory'] == '1') {
	    $itemSettings['category'] = 'comment';
	}

	/* check if pubDate tag should be used */
	if (isset($param['usePubDate']) && $param['usePubDate']) {
	    $itemSettings['pubDate'] = date('r', $item->getDate());
	}

	$generator->addItem($itemSettings, $item->getId());

	return null;
    }

    /**
     * This function fetches albums or items inside a root album
     *
     * @param int $itemId the root album Id
     * @param int $limit the maximum number of items to fetch from the DB
     * @param boolean $newOnly if true, only select new items (not changed)
     * @param boolean $allowPhotos if true, returns photos; if false, albums
     * @param int $perAlbumLimit the maximum number of pictures to return from a single album
     * @return array object GalleryStatus
     *               array of item Ids
     *
     * copied and modified from GalleryItemHelper_simple
     */
    function fetchAlbumTree($itemId, $limit, $newOnly, $allowPhotos, $perAlbumLimit = 0) {
	global $gallery;
	$storage =& $gallery->getStorage();
	$userId = $gallery->getActiveUserId();

	list ($ret, $aclIds) = GalleryCoreApi::fetchAccessListIds('core.view', $userId);
	if (empty($aclIds)) {
	    return array(null, array());
	}
	$aclMarkers = GalleryUtilities::makeMarkers(count($aclIds));

	list ($ret, $parentSequence) = GalleryCoreApi::fetchParentSequence($itemId);
	if ($ret) {
	    return array($ret, null);
	}

	$ret = GalleryCoreApi::assertHasItemPermission($itemId, 'core.view');
	if ($ret) {
	    return array($ret, null);
	}
	$parentSequence[] = $itemId;
	$parentSequence = implode('/', $parentSequence);

	$timestamp = $newOnly ? 'creationTimestamp' : 'modificationTimestamp';
	$table = $allowPhotos ? 'GalleryDataItem' : 'GalleryAlbumItem';

	list ($ret, $newDays) =
	    GalleryCoreApi::getPluginParameter('module', 'newitems', 'days.new');
	if ($ret || !$newDays) {
	    $newDays = 1; /* Use default on error or zero setting */
	}
	$timeCutOff = time() - 3600 * 24 * $newDays;

	$query = "
	    SELECT
	      [$table::id]";

	if ($perAlbumLimit != 0) {
	    $query .= ', [GalleryItemAttributesMap::parentSequence]';
	}

	$query .= "
	    FROM
	      [$table], [GalleryItemAttributesMap],
	      [GalleryAccessSubscriberMap], [GalleryEntity]
	    WHERE
	      [GalleryEntity::$timestamp] >= $timeCutOff
	      AND
	      [$table::id] = [GalleryItemAttributesMap::itemId]
	      AND
	      [$table::id] = [GalleryEntity::id]";

	if (!empty($parentSequence)) {
	    $query .= "
	      AND
	      [GalleryItemAttributesMap::parentSequence] LIKE '$parentSequence/%'";
	}

	$query .= "
	      AND
	      [$table::id] = [GalleryAccessSubscriberMap::itemId]
	      AND
	      [GalleryAccessSubscriberMap::accessListId] IN ($aclMarkers)
	    ORDER BY
	      [GalleryEntity::$timestamp] DESC
	    ";

	$data = $aclIds;

	$params = array();

	if (isset($limit)) {
	    $params['limit'] = array('count' => $limit);
	}

	list ($ret, $searchResults) = $gallery->search($query, $data, $params);
	if ($ret) {
	    return array($ret, null);
	}

	$list = array();
	$perAlbum = array();
	while ($result = $searchResults->nextResult()) {
	    if ($perAlbumLimit != 0) {
		/*
		 * check number of items already accepted for this album
		 * is lower than the limit
		 */
		if (isset($perAlbum[$result[1]])) {
		    $n = $perAlbum[$result[1]];

		    if ($n < $perAlbumLimit) {
			/* under the limit */
			$perAlbum[$result[1]] = $n + 1;
			$list[] = $result[0];
		    }
		} else {
		    /* first item for this album: accept */
		    $perAlbum[$result[1]] = 1;
		    $list[] = $result[0];
		}
	    } else {
		/* include all results */
		$list[] = $result[0];
	    }
	}

	return array(null, $list);
    }

    /**
     * This provides a translation of the feed type codes
     *
     * @return array object GalleryStatus
     *               array of feedType => translation
     */
    function getFeedTypeTranslation() {
	list ($ret, $module) = GalleryCoreApi::loadPlugin('module', 'rss');
	if ($ret) {
	    return array($ret, null);
	}

	return array(null, array(
		'photos' => $module->translate('Items in an album'),
		'album' => $module->translate('Sub-albums of an album'),
		'photosRecurse' => $module->translate('Items in an album and its sub-albums'),
		'commentsAlbum' => $module->translate('Comments for an album'),
		'commentsPhoto' => $module->translate('Comments for an item'),
		'commentsRecursive' =>
		    $module->translate('Comments for an album and its subalbums'),
		));
    }
}
?>