/*
* Copyright 2014 Jeanfrancois Arcand
*
* 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 org.atmosphere.interceptor;
import org.atmosphere.cpr.Action;
import org.atmosphere.cpr.AsyncIOInterceptorAdapter;
import org.atmosphere.cpr.AsyncIOWriter;
import org.atmosphere.cpr.AtmosphereInterceptorAdapter;
import org.atmosphere.cpr.AtmosphereInterceptorWriter;
import org.atmosphere.cpr.AtmosphereResource;
import org.atmosphere.cpr.AtmosphereResource.TRANSPORT;
import org.atmosphere.cpr.AtmosphereResourceImpl;
import org.atmosphere.cpr.AtmosphereResponse;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Fix for the Android 2.2.x bogus HTTP implementation.
*
* @author Jeanfrancois Arcand
*/
public class AndroidAtmosphereInterceptor extends AtmosphereInterceptorAdapter {
private static final Logger logger = LoggerFactory.getLogger(AndroidAtmosphereInterceptor.class);
private static final byte[] padding;
private static final String paddingText;
static {
StringBuffer whitespace = new StringBuffer();
for (int i = 0; i < 4096; i++) {
whitespace.append(" ");
}
whitespace.append("\n");
paddingText = whitespace.toString();
padding = paddingText.getBytes();
}
@Override
public Action inspect(final AtmosphereResource r) {
if (!r.transport().equals(TRANSPORT.STREAMING)) return Action.CONTINUE;
final AtmosphereResponse response = AtmosphereResourceImpl.class.cast(r).getResponse(false);
String userAgent = AtmosphereResourceImpl.class.cast(r).getRequest(false).getHeader("User-Agent");
if (userAgent != null &&
(userAgent.indexOf("Android 2.") != -1 || userAgent.indexOf("Android 3.") != -1)) {
super.inspect(r);
AsyncIOWriter writer = response.getAsyncIOWriter();
if (AtmosphereInterceptorWriter.class.isAssignableFrom(writer.getClass())) {
AtmosphereInterceptorWriter.class.cast(writer).interceptor(new AsyncIOInterceptorAdapter() {
@Override
public void prePayload(AtmosphereResponse response, byte[] data, int offset, int length) {
response.write(padding, true);
}
@Override
public void postPayload(AtmosphereResponse response, byte[] data, int offset, int length) {
response.write(padding, true);
}
});
} else {
logger.warn("Unable to apply {}. Your AsyncIOWriter must implement {}", getClass().getName(), AtmosphereInterceptorWriter.class.getName());
}
}
return Action.CONTINUE;
}
@Override
public String toString() {
return "Android Interceptor Support";
}
}