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/** * <a href="http://www.openolat.org"> * OpenOLAT - Online Learning and Training</a><br> * <p> * Licensed under the Apache License, Version 2.0 (the "License"); <br> * you may not use this file except in compliance with the License.<br> * You may obtain a copy of the License at the * <a href="http://www.apache.org/licenses/LICENSE-2.0">Apache homepage</a> * <p> * Unless required by applicable law or agreed to in writing,<br> * software distributed under the License is distributed on an "AS IS" BASIS, <br> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. <br> * See the License for the specific language governing permissions and <br> * limitations under the License. * <p> * Initial code contributed and copyrighted by<br> * frentix GmbH, http://www.frentix.com * <p> */package org.olat.modules.webFeed.manager;import java.io.BufferedInputStream;import java.io.File;import java.io.IOException;import java.io.InputStream;import java.nio.file.Files;import java.nio.file.Path;import java.util.ArrayList;import java.util.List;import org.olat.core.commons.services.image.ImageService;import org.olat.core.gui.components.form.flexible.elements.FileElement;import org.olat.core.id.OLATResourceable;import org.apache.logging.log4j.Logger;import org.olat.core.logging.Tracing;import org.olat.core.util.CodeHelper;import org.olat.core.util.FileUtils;import org.olat.core.util.Formatter;import org.olat.core.util.StringHelper;import org.olat.core.util.vfs.LocalFileImpl;import org.olat.core.util.vfs.LocalFolderImpl;import org.olat.core.util.vfs.VFSContainer;import org.olat.core.util.vfs.VFSItem;import org.olat.core.util.vfs.VFSLeaf;import org.olat.core.util.vfs.VFSManager;import org.olat.core.util.vfs.filters.VFSItemMetaFilter;import org.olat.core.util.vfs.filters.VFSSystemItemFilter;import org.olat.core.util.xml.XStreamHelper;import org.olat.fileresource.FileResourceManager;import org.olat.modules.webFeed.Enclosure;import org.olat.modules.webFeed.Feed;import org.olat.modules.webFeed.Item;import org.olat.modules.webFeed.model.EnclosureImpl;import org.olat.modules.webFeed.model.FeedImpl;import org.olat.modules.webFeed.model.ItemImpl;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Service;import com.thoughtworks.xstream.XStream;/** * This class helps to store data like images and videos in the file systems * and handles the storage of Feeds and Items as XML as well. * * The structure of the files of a feed is: * resource * feed * __feed.xml * __/items * ____/item * ______item.xml * ______/media * ________image.jpg * ____/item * ______... * * Initial date: 22.05.2017<br> * @author uhensler, [email protected], http://www.frentix.com * */@Servicepublic class FeedFileStorge { private static final Logger log = Tracing.createLoggerFor(FeedFileStorge.class); private static final String MEDIA_DIR = "media"; private static final String ITEMS_DIR = "items"; public static final String FEED_FILE_NAME = "feed.xml"; public static final String ITEM_FILE_NAME = "item.xml"; // same as in repository metadata image upload private static final int PICTUREWIDTH = 570; private FileResourceManager fileResourceManager; private final XStream xstream; @Autowired private ImageService imageHelper; public FeedFileStorge() { fileResourceManager = FileResourceManager.getInstance(); xstream = XStreamHelper.createXStreamInstance(); XStreamHelper.allowDefaultPackage(xstream); xstream.alias("feed", FeedImpl.class); xstream.aliasField("type", FeedImpl.class, "resourceableType"); xstream.omitField(FeedImpl.class, "id"); xstream.omitField(FeedImpl.class, "itemIds"); xstream.omitField(FeedImpl.class, "key"); xstream.omitField(FeedImpl.class, "wrappers"); xstream.alias("item", ItemImpl.class); xstream.omitField(ItemImpl.class, "key"); xstream.omitField(ItemImpl.class, "feed"); xstream.alias("enclosure", Enclosure.class, EnclosureImpl.class); xstream.ignoreUnknownElements(); } /** * Get the resource (root) container of the feed. * * @param ores * @return */ public LocalFolderImpl getResourceContainer(OLATResourceable ores) { return fileResourceManager.getFileResourceRootImpl(ores); } public VFSContainer getOrCreateResourceMediaContainer(OLATResourceable ores) { VFSContainer mediaContainer = null; if (ores != null) { VFSContainer resourceDir = getResourceContainer(ores); mediaContainer = (VFSContainer) resourceDir.resolve(MEDIA_DIR); if (mediaContainer == null) { mediaContainer = resourceDir.createChildContainer(MEDIA_DIR); } } return mediaContainer; } /** * Get the top most folder of a feed. * The container is created if it does not exist. * * @param ores * @return the container or null */ public VFSContainer getOrCreateFeedContainer(OLATResourceable ores) { VFSContainer feedContainer = null; if (ores != null) { VFSContainer resourceDir = getResourceContainer(ores); String feedContainerName = FeedManager.getInstance().getFeedKind(ores); feedContainer = (VFSContainer) resourceDir.resolve(feedContainerName); if (feedContainer == null) { feedContainer = resourceDir.createChildContainer(feedContainerName); } } return feedContainer; } /** * Get the media container of a feed. * The container is created if it does not exist. * * @param ores * @return the container or null */ public VFSContainer getOrCreateFeedMediaContainer(OLATResourceable ores) { VFSContainer mediaContainer = null; if (ores != null) { VFSContainer feedContainer = getOrCreateFeedContainer(ores); mediaContainer = (VFSContainer) feedContainer.resolve(MEDIA_DIR); if (mediaContainer == null) { mediaContainer = feedContainer.createChildContainer(MEDIA_DIR); } } return mediaContainer; } /** * Get the items container of a feed. * The container is created if it does not exist. * * @param ores * @return the container or null */ public VFSContainer getOrCreateFeedItemsContainer(OLATResourceable ores) { VFSContainer itemsContainer = null; if (ores != null) { VFSContainer feedContainer = getOrCreateFeedContainer(ores); itemsContainer = (VFSContainer) feedContainer.resolve(ITEMS_DIR); if (itemsContainer == null) { itemsContainer = feedContainer.createChildContainer(ITEMS_DIR); } } return itemsContainer; } /** * Get the container of an item. * The container is created if it does not exist. * * @param ores * @return the container or null */ public VFSContainer getOrCreateItemContainer(Item item) { VFSContainer itemContainer = null; if (item != null) { Feed feed = item.getFeed(); String guid = item.getGuid(); itemContainer = getOrCreateItemContainer(feed, guid); } return itemContainer; } /** * Delete the container of the item. * * @param item */ public void deleteItemContainer(Item item) { VFSContainer itemContainer = getOrCreateItemContainer(item); if (itemContainer != null) { itemContainer.delete(); } } /** * Get the container for the guid of an item. * The container is created if it does not exist. * @param feed * @param guid * @return */ public VFSContainer getOrCreateItemContainer(Feed feed, String guid) { VFSContainer itemContainer = null; if (feed != null && StringHelper.containsNonWhitespace(guid)) { VFSContainer feedContainer = getOrCreateFeedItemsContainer(feed); itemContainer = (VFSContainer) feedContainer.resolve(guid); if (itemContainer == null) { itemContainer = feedContainer.createChildContainer(guid); } } return itemContainer; } /** * Get the media container of an item. * The container is created if it does not exist. * * @param ores * @return the container or null */ public VFSContainer getOrCreateItemMediaContainer(Item item) { VFSContainer mediaContainer = null; if (item != null) { VFSContainer itemContainer = getOrCreateItemContainer(item); if (itemContainer != null) { mediaContainer = (VFSContainer) itemContainer.resolve(MEDIA_DIR); if (mediaContainer == null) { mediaContainer = itemContainer.createChildContainer(MEDIA_DIR); } } } return mediaContainer; } /** * Save the feed as XML into the feed container. * * @param feed */ public void saveFeedAsXML(Feed feed) { VFSContainer feedContainer = getOrCreateFeedContainer(feed); if (feedContainer != null) { VFSLeaf leaf = (VFSLeaf) feedContainer.resolve(FEED_FILE_NAME); if (leaf == null) { leaf = feedContainer.createChildLeaf(FEED_FILE_NAME); } XStreamHelper.writeObject(xstream, leaf, feed); } } /** * Load the XML file of the feed from the feed container and convert it to * a feed. * * @param ores * @return the feed or null */ public Feed loadFeedFromXML(OLATResourceable ores) { Feed feed = null; VFSContainer feedContainer = getOrCreateFeedContainer(ores); if (feedContainer != null) { VFSLeaf leaf = (VFSLeaf) feedContainer.resolve(FEED_FILE_NAME); if (leaf != null) { feed = (FeedImpl) XStreamHelper.readObject(xstream, leaf); shorteningFeedToLengthOfDbAttribues(feed); } } else { log.warn("Feed XML-File could not be found on file system. Feed container: " + feedContainer); } return feed; } private void shorteningFeedToLengthOfDbAttribues(Feed feed) { if (feed.getAuthor() != null && feed.getAuthor().length() > 255) { feed.setAuthor(feed.getAuthor().substring(0, 255)); } if (feed.getTitle() != null && feed.getTitle().length() > 1024) { feed.setTitle(feed.getTitle().substring(0, 1024)); } if (feed.getDescription() != null && feed.getDescription().length() > 4000) { feed.setDescription(feed.getDescription().substring(0, 4000)); } if (feed.getImageName() != null && feed.getImageName().length() > 1024) { feed.setImageName(null); } if (feed.getExternalFeedUrl() != null && feed.getExternalFeedUrl().length() > 4000) { feed.setExternalFeedUrl(null); } if (feed.getExternalImageURL() != null && feed.getExternalImageURL().length() > 4000) { feed.setExternalImageURL(null); } } /** * Load the XML file of the feed from a Path and convert it to * a feed. * * @param feedDir the directory which contains the feed file * @return the feed or null */ public Feed loadFeedFromXML(Path feedDir) { Feed feed = null; if (feedDir != null) { Path feedPath = feedDir.resolve(FeedFileStorge.FEED_FILE_NAME); try (InputStream in = Files.newInputStream(feedPath); BufferedInputStream bis = new BufferedInputStream(in, FileUtils.BSIZE)) { feed = (FeedImpl) XStreamHelper.readObject(xstream, bis); } catch (IOException e) { log.warn("Feed XML-File could not be found on file system. Feed path: " + feedPath, e); } } return feed; } /** * Delete the XML file of the feed from the feed container * * @param feed */ public void deleteFeedXML(Feed feed) { VFSContainer feedContainer = getOrCreateFeedContainer(feed); if (feedContainer != null) { VFSLeaf leaf = (VFSLeaf) feedContainer.resolve(FEED_FILE_NAME); if (leaf != null) { leaf.delete(); } } } /** * Save the item as XML into the item container. * * @param item */ public void saveItemAsXML(Item item) { VFSContainer itemContainer = getOrCreateItemContainer(item); if (itemContainer != null) { VFSLeaf leaf = (VFSLeaf) itemContainer.resolve(ITEM_FILE_NAME); if (leaf == null) { leaf = itemContainer.createChildLeaf(ITEM_FILE_NAME); } XStreamHelper.writeObject(xstream, leaf, item); } } /** * Load the XML file of the item from the item container and convert it to * an item. * * @param feed * @param guid * @return */ Item loadItemFromXML(VFSContainer itemContainer) { Item item = null; if (itemContainer != null) { VFSLeaf leaf = (VFSLeaf) itemContainer.resolve(ITEM_FILE_NAME); if (leaf != null) { try { item = (ItemImpl) XStreamHelper.readObject(xstream, leaf); } catch (Exception e) { log.warn("Item XML-File could not be read. Item container: " + leaf); } } } return item; } /** * Load the XML file of all items of a feed and convert them to items. * * @param ores * @return */ public List<Item> loadItemsFromXML(OLATResourceable ores) { List<Item> items = new ArrayList<>(); VFSContainer itemsContainer = getOrCreateFeedItemsContainer(ores); if (itemsContainer != null) { List<VFSItem> itemContainers = itemsContainer.getItems(new VFSItemMetaFilter()); if (itemContainers != null && !itemContainers.isEmpty()) { for (VFSItem itemContainer : itemContainers) { Item item = loadItemFromXML((VFSContainer) itemContainer); if (item != null) { shorteningItemToLengthOfDbAttributes(item); items.add(item); } } } } return items; } private void shorteningItemToLengthOfDbAttributes(Item item) { if (item.getAuthor() != null && item.getAuthor().length() > 255) { item.setAuthor(item.getAuthor().substring(0, 255)); } if (item.getExternalLink() != null && item.getExternalLink().length() > 4000) { item.setExternalLink(null); } if (item.getTitle() != null && item.getTitle().length() > 1024) { item.setTitle(item.getTitle().substring(0, 1024)); } } /** * Delete the XML file of the item from the item container * * @param item */ public void deleteItemXML(Item item) { VFSContainer itemContainer = getOrCreateItemContainer(item); if (itemContainer != null) { VFSLeaf leaf = (VFSLeaf) itemContainer.resolve(ITEM_FILE_NAME); if (leaf != null) { leaf.delete(); } } } /** * Save the media element of the feed. If already a file is in the media * container, that file is previously deleted. If the media is null, this * method will do nothing. It does not delete the existing media. * * @param feed * @param media * @return the file name which is save for the file system */ public String saveFeedMedia(Feed feed, FileElement media) { String saveFileName = null; if (media != null) { VFSContainer feedMediaContainer = getOrCreateFeedMediaContainer(feed); if (feedMediaContainer != null) { deleteFeedMedia(feed); VFSLeaf imageLeaf = media.moveUploadFileTo(feedMediaContainer); // Resize to same dimension box as with repo meta image VFSLeaf tmpImage = feedMediaContainer.createChildLeaf(Long.toString(CodeHelper.getRAMUniqueID())); imageHelper.scaleImage(imageLeaf, tmpImage, PICTUREWIDTH, PICTUREWIDTH, false); imageLeaf.delete(); imageLeaf = tmpImage; // Make file system save saveFileName = Formatter.makeStringFilesystemSave(media.getUploadFileName()); imageLeaf.rename(saveFileName); } } return saveFileName; } /** * Save a file as the media element of the feed. If already a file is in * the media container, that file is previously deleted. * * @param feed * @param media * @return the file name which is save for the file system */ public String saveFeedMedia(Feed feed, VFSLeaf media) { String saveFileName = null; VFSContainer feedMediaContainer = getOrCreateFeedMediaContainer(feed); if (feedMediaContainer != null) { deleteFeedMedia(feed); if (media != null) { VFSManager.copyContent(media, feedMediaContainer.createChildLeaf(media.getName()), true); saveFileName = media.getName(); } } return saveFileName; } /** * Load the the media element of the feed. * * @param feed * @return the media alement or null */ public VFSLeaf loadFeedMedia(Feed feed) { VFSLeaf mediaFile = null; if (feed != null) { String feedImage = feed.getImageName(); if (feedImage != null) { mediaFile = (VFSLeaf) getOrCreateFeedMediaContainer(feed).resolve(feedImage); } } return mediaFile; } /** * Delete the the media of the feed. * * @param feed */ public void deleteFeedMedia(Feed feed) { VFSContainer feedMediaContainer = getOrCreateFeedMediaContainer(feed); if (feedMediaContainer != null) { for (VFSItem fileItem : feedMediaContainer.getItems(new VFSSystemItemFilter())) { fileItem.delete(); } } } /** * Save a file (video/audio/image) to the media container of the item. * <p> * If the media is null, this method will do nothing. It does not delete the * existing media files. * * @param item * @param media * @return the file name which is save for the file system */ public String saveItemMedia(Item item, FileElement media) { String saveFileName = null; if (media != null) { VFSContainer itemMediaContainer = getOrCreateItemMediaContainer(item); if (itemMediaContainer != null) { media.moveUploadFileTo(itemMediaContainer); saveFileName = media.getUploadFileName(); } } return saveFileName; } /** * Load the media file of the item. * * @param item * @return */ public File loadItemMedia(Item item) { File file = null; Enclosure enclosure = item.getEnclosure(); VFSContainer mediaDir = getOrCreateItemMediaContainer(item); if (mediaDir != null && enclosure != null) { VFSLeaf mediaFile = (VFSLeaf) mediaDir.resolve(enclosure.getFileName()); if (mediaFile instanceof LocalFileImpl) { file = ((LocalFileImpl) mediaFile).getBasefile(); } } return file; } /** * Delete a file from the media container of an item. * * @param item * @param fileName */ public void deleteItemMedia(Item item, String fileName) { if (fileName != null) { VFSContainer itemContainer = getOrCreateItemMediaContainer(item); if (itemContainer != null) { VFSLeaf leaf = (VFSLeaf) itemContainer.resolve(fileName); if (leaf != null) { leaf.delete(); } } } }} |