/*
* Copyright 2011 Google Inc. All Rights Reserved.
*
* 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.walkaround.wave.server.rpc;
import com.google.appengine.api.urlfetch.FetchOptions;
import com.google.appengine.api.urlfetch.HTTPMethod;
import com.google.appengine.api.urlfetch.HTTPRequest;
import com.google.appengine.api.urlfetch.HTTPResponse;
import com.google.common.net.UriEscapers;
import com.google.inject.Inject;
import com.google.walkaround.util.server.servlet.AbstractHandler;
import com.google.walkaround.wave.server.auth.OAuthedFetchService;
import com.google.walkaround.wave.server.util.ProxyHandler;
import com.google.walkaround.wave.shared.SharedConstants;
import java.io.IOException;
import java.net.URL;
import java.util.logging.Logger;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Handles photo requests by proxying them to the m8 feed.
*
* @author hearnden@google.com (David Hearnden)
*/
public final class PhotosHandler extends AbstractHandler {
@SuppressWarnings("unused")
private static final Logger log = Logger.getLogger(PhotosHandler.class.getName());
private final OAuthedFetchService fetch;
@Inject
public PhotosHandler(OAuthedFetchService fetch) {
this.fetch = fetch;
}
@Override
public void doGet(HttpServletRequest req, HttpServletResponse resp) throws IOException {
String photoId = requireParameter(req, "photoId");
// http://code.google.com/apis/contacts/docs/2.0/developers_guide_protocol.html#groups_feed_url
// says "You can also substitute 'default' for the user's email address,
// which tells the server to return the contact groups for the user whose
// credentials accompany the request". I didn't read the document in enough
// detail to check whether this is supposed to apply to photos as well, but
// it seems to work.
URL targetUrl = new URL("https://www.google.com/m8/feeds/photos/media/default/"
+ UriEscapers.uriQueryStringEscaper(false).escape(photoId));
HTTPResponse response = fetch.fetch(
new HTTPRequest(targetUrl, HTTPMethod.GET,
FetchOptions.Builder.withDefaults().disallowTruncate()));
if (response.getResponseCode() == 404) {
// Rather than a broken image, use the unknown avatar.
log.info("Missing image, using default");
resp.sendRedirect(SharedConstants.UNKNOWN_AVATAR_URL);
} else {
ProxyHandler.copyResponse(response, resp);
}
// TODO(hearnden): Do something to make the client cache photos sensibly.
}
}