/*
* Copyright (c) 2009 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
* in compliance with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under the License
* is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
* or implied. See the License for the specific language governing permissions and limitations under
* the License.
*/
package com.google.ytd.youtube;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.google.gdata.data.Link;
import com.google.gdata.data.youtube.VideoEntry;
import com.google.inject.Inject;
import com.google.inject.Singleton;
import com.google.ytd.dao.UserAuthTokenDao;
import com.google.ytd.model.UserAuthToken;
import com.google.ytd.util.Util;
/**
* Servlet that retrieves the Insight download link for a video and redirects the browser there.
*
* The Insight download link is generated with a time-sensitive parameter, so it can't be cached.
* More info on Insight data is available at
* http://code.google.com/apis/youtube/2.0/developers_guide_protocol_insight.html
*/
@Singleton
public class InsightDownloadRedirect extends HttpServlet {
private static final Logger log = Logger.getLogger(InsightDownloadRedirect.class.getName());
@Inject
private Util util;
@Inject
private YouTubeApiHelper apiManager;
@Inject
private UserAuthTokenDao userAuthTokenDao;
@Override
public void doGet(HttpServletRequest req, HttpServletResponse resp) throws IOException {
try {
String id = req.getParameter("id");
if (util.isNullOrEmpty(id)) {
throw new IllegalArgumentException("'id' parameter is null or empty.");
}
String user = req.getParameter("user");
if (util.isNullOrEmpty(user)) {
throw new IllegalArgumentException("'user' parameter is null or empty.");
}
UserAuthToken userAuthToken = userAuthTokenDao.getUserAuthToken(user);
if (!util.isNullOrEmpty(userAuthToken.getAuthSubToken())) {
apiManager.setAuthSubToken(userAuthToken.getAuthSubToken());
} else if (!util.isNullOrEmpty(userAuthToken.getClientLoginToken())) {
apiManager.setClientLoginToken(userAuthToken.getClientLoginToken());
} else {
throw new IllegalArgumentException(String.format("Couldn't retrieve authentication token for user '%s'.", user));
}
VideoEntry videoEntry = apiManager.getVideoEntry(id);
if (videoEntry == null) {
throw new IllegalArgumentException(String.format("Couldn't retrieve video entry with id " + "'%s' for user '%s'.", id, user));
}
Link insightLink = videoEntry.getLink("http://gdata.youtube.com/schemas/2007#insight.views", null);
if (insightLink != null) {
String url = insightLink.getHref();
if (util.isNullOrEmpty(url)) {
throw new IllegalArgumentException(String.format("No insight download URL found for " + "video id '%s'.", id));
}
resp.sendRedirect(url);
} else {
throw new IllegalArgumentException(String.format("No insight download link found for " + "video id '%s'.", id));
}
} catch (IllegalArgumentException e) {
log.log(Level.WARNING, "", e);
resp.sendError(HttpServletResponse.SC_BAD_REQUEST, e.getMessage());
}
}
}