/*
* 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.attachment;
import com.google.appengine.api.blobstore.BlobstoreService;
import com.google.gxp.base.GxpContext;
import com.google.inject.Inject;
import com.google.walkaround.util.server.servlet.AbstractHandler;
import com.google.walkaround.wave.server.Flag;
import com.google.walkaround.wave.server.FlagName;
import com.google.walkaround.wave.server.gxp.UploadForm;
import java.io.IOException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Displays an upload form suitable for inclusion in an iframe.
*
* We use iframes because the upload URL generated by the blobstore can only be
* used once, so the alternative would be to use an XHR to prepare the upload
* form's action each time, unecessary effort for now. In the future we could do
* a pre-emptive XHR to grab a few upload tokens in advance - I'm not sure how
* long it takes for them to expire though.
*
* @author danilatos@google.com (Daniel Danilatos)
*/
public class AttachmentFormHandler extends AbstractHandler {
@Inject BlobstoreService blobstoreService;
@Inject @Flag(FlagName.ANALYTICS_ACCOUNT) String analyticsAccount;
@Override
public void doGet(HttpServletRequest req, HttpServletResponse resp) throws IOException {
String formAction = blobstoreService.createUploadUrl("/upload");
if (formAction == null) {
throw new RuntimeException("Null blobstore upload url");
}
UploadForm.write(resp.getWriter(), new GxpContext(getLocale(req)),
analyticsAccount, formAction);
}
}