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/*
This file is part of Subsonic.
Subsonic 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 3 of the License, or
(at your option) any later version.
Subsonic 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 Subsonic. If not, see <http://www.gnu.org/licenses/>.
Copyright 2009 (C) Sindre Mehus
*/
package net.sourceforge.subsonic.ajax;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import org.apache.commons.io.IOUtils;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.params.HttpConnectionParams;
import net.sourceforge.subsonic.Logger;
import net.sourceforge.subsonic.domain.MediaFile;
import net.sourceforge.subsonic.service.MediaFileService;
import net.sourceforge.subsonic.service.SecurityService;
import net.sourceforge.subsonic.util.StringUtil;
/**
* Provides AJAX-enabled services for changing cover art images.
* <p/>
* This class is used by the DWR framework (http://getahead.ltd.uk/dwr/).
*
* @author Sindre Mehus
*/
public class CoverArtService {
private static final Logger LOG = Logger.getLogger(CoverArtService.class);
private SecurityService securityService;
private MediaFileService mediaFileService;
/**
* Downloads and saves the cover art at the given URL.
*
* @param albumId ID of the album in question.
* @param url The image URL.
* @return The error string if something goes wrong, <code>null</code> otherwise.
*/
public String setCoverArtImage(int albumId, String url) {
try {
MediaFile mediaFile = mediaFileService.getMediaFile(albumId);
saveCoverArt(mediaFile.getPath(), url);
return null;
} catch (Exception x) {
LOG.warn("Failed to save cover art for album " + albumId, x);
return x.toString();
}
}
private void saveCoverArt(String path, String url) throws Exception {
InputStream input = null;
HttpClient client = new DefaultHttpClient();
try {
HttpConnectionParams.setConnectionTimeout(client.getParams(), 20 * 1000); // 20 seconds
HttpConnectionParams.setSoTimeout(client.getParams(), 20 * 1000); // 20 seconds
HttpGet method = new HttpGet(url);
HttpResponse response = client.execute(method);
input = response.getEntity().getContent();
// Attempt to resolve proper suffix.
String suffix = "jpg";
if (url.toLowerCase().endsWith(".gif")) {
suffix = "gif";
} else if (url.toLowerCase().endsWith(".png")) {
suffix = "png";
}
// Check permissions.
File newCoverFile = new File(path, "cover." + suffix);
if (!securityService.isWriteAllowed(newCoverFile)) {
throw new Exception("Permission denied: " + StringUtil.toHtml(newCoverFile.getPath()));
}
// If file exists, create a backup.
backup(newCoverFile, new File(path, "cover.backup." + suffix));
// Write file.
IOUtils.copy(input, new FileOutputStream(newCoverFile));
MediaFile mediaFile = mediaFileService.getMediaFile(path);
// Rename existing cover file if new cover file is not the preferred.
try {
File coverFile = mediaFileService.getCoverArt(mediaFile);
if (coverFile != null) {
if (!newCoverFile.equals(coverFile)) {
coverFile.renameTo(new File(coverFile.getCanonicalPath() + ".old"));
LOG.info("Renamed old image file " + coverFile);
}
}
} catch (Exception x) {
LOG.warn("Failed to rename existing cover file.", x);
}
mediaFileService.refreshMediaFile(mediaFile);
} finally {
IOUtils.closeQuietly(input);
client.getConnectionManager().shutdown();
}
}
private void backup(File newCoverFile, File backup) {
if (newCoverFile.exists()) {
if (backup.exists()) {
backup.delete();
}
if (newCoverFile.renameTo(backup)) {
LOG.info("Backed up old image file to " + backup);
} else {
LOG.warn("Failed to create image file backup " + backup);
}
}
}
public void setSecurityService(SecurityService securityService) {
this.securityService = securityService;
}
public void setMediaFileService(MediaFileService mediaFileService) {
this.mediaFileService = mediaFileService;
}
}
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