/**
* Copyright (C) 2012 Turn, 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.turn.ttorrent.common.protocol.http;
import com.turn.ttorrent.bcodec.BDecoder;
import com.turn.ttorrent.bcodec.BEValue;
import com.turn.ttorrent.bcodec.BEncoder;
import com.turn.ttorrent.bcodec.InvalidBEncodingException;
import com.turn.ttorrent.common.Torrent;
import com.turn.ttorrent.common.protocol.TrackerMessage.ErrorMessage;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.HashMap;
import java.util.Map;
/**
* An error message from an HTTP tracker.
*
* @author mpetazzoni
*/
public class HTTPTrackerErrorMessage extends HTTPTrackerMessage
implements ErrorMessage {
private final String reason;
private HTTPTrackerErrorMessage(ByteBuffer data, String reason) {
super(Type.ERROR, data);
this.reason = reason;
}
@Override
public String getReason() {
return this.reason;
}
public static HTTPTrackerErrorMessage parse(ByteBuffer data)
throws IOException, MessageValidationException {
BEValue decoded = BDecoder.bdecode(data);
if (decoded == null) {
throw new MessageValidationException(
"Could not decode tracker message (not B-encoded?)!");
}
Map<String, BEValue> params = decoded.getMap();
try {
return new HTTPTrackerErrorMessage(
data,
params.get("failure reason")
.getString(Torrent.BYTE_ENCODING));
} catch (InvalidBEncodingException ibee) {
throw new MessageValidationException("Invalid tracker error " +
"message!", ibee);
}
}
public static HTTPTrackerErrorMessage craft(
ErrorMessage.FailureReason reason) throws IOException,
MessageValidationException {
return HTTPTrackerErrorMessage.craft(reason.getMessage());
}
public static HTTPTrackerErrorMessage craft(String reason)
throws IOException, MessageValidationException {
Map<String, BEValue> params = new HashMap<String, BEValue>();
params.put("failure reason",
new BEValue(reason, Torrent.BYTE_ENCODING));
return new HTTPTrackerErrorMessage(
BEncoder.bencode(params),
reason);
}
}