/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.vysper.xmpp.server.s2s;
import java.net.InetSocketAddress;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import org.xbill.DNS.Lookup;
import org.xbill.DNS.Name;
import org.xbill.DNS.Record;
import org.xbill.DNS.SRVRecord;
import org.xbill.DNS.TextParseException;
import org.xbill.DNS.Type;
public class XmppEndpointResolver {
private static final int SERVER_PORT = 5269;
public static class ResolvedAddress {
private InetSocketAddress address;
private int priority;
public ResolvedAddress(Name name, int port, int priority) {
this(name.toString(), port, priority);
}
public ResolvedAddress(String name, int port, int priority) {
this.address = new InetSocketAddress(name, port);
this.priority = priority;
}
public InetSocketAddress getAddress() {
return address;
}
public int getPriority() {
return priority;
}
@Override
public String toString() {
return "[address=" + address + ", priority=" + priority + "]";
}
}
public List<ResolvedAddress> resolveXmppServer(String domain) {
List<ResolvedAddress> addresses = new ArrayList<ResolvedAddress>();
try {
Record[] records = new Lookup("_xmpp-server._tcp." + domain, Type.SRV).run();
if(records != null) {
for (int i = 0; i < records.length; i++) {
SRVRecord srv = (SRVRecord) records[i];
addresses.add(new ResolvedAddress(srv.getTarget(), srv.getPort(), srv.getPriority()));
}
// sort by priority
Collections.sort(addresses, new Comparator<ResolvedAddress>() {
public int compare(ResolvedAddress a1, ResolvedAddress a2) {
return a1.getPriority() - a2.getPriority();
}
});
} else {
addresses.add(new ResolvedAddress(domain, SERVER_PORT, 0));
}
} catch (TextParseException e) {
// ignore
}
return addresses;
}
}