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/*
* Jitsi, the OpenSource Java VoIP and Instant Messaging client.
*
* Copyright @ 2015 Atlassian Pty Ltd
*
* 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 net.java.sip.communicator.impl.provdisc.mdns;
import java.io.*;
import java.util.*;
import javax.jmdns.*;
import net.java.sip.communicator.service.provdisc.event.*;
import net.java.sip.communicator.util.*;
/**
* Class that will perform mDNS provisioning discovery.
*
* @author Sebastien Vincent
*/
public class MDNSProvisioningDiscover
implements Runnable
{
/**
* Logger.
*/
private final Logger logger
= Logger.getLogger(MDNSProvisioningDiscover.class);
/**
* MDNS timeout (in milliseconds).
*/
private static final int MDNS_TIMEOUT = 2000;
/**
* List of <tt>ProvisioningListener</tt> that will be notified when
* a provisioning URL is retrieved.
*/
private List<DiscoveryListener> listeners =
new ArrayList<DiscoveryListener>();
/**
* Reference to JmDNS singleton.
*/
private JmDNS jmdns = null;
/**
* Constructor.
*/
public MDNSProvisioningDiscover()
{
}
/**
* Thread entry point. It runs <tt>discoverProvisioningURL</tt> in a
* separate thread.
*/
public void run()
{
String url = discoverProvisioningURL();
if(url != null)
{
/* as we run in an asynchronous manner, notify the listener */
DiscoveryEvent evt = new DiscoveryEvent(this, url);
for(DiscoveryListener listener : listeners)
{
listener.notifyProvisioningURL(evt);
}
}
}
/**
* It sends a mDNS to retrieve provisioning URL and wait for a response.
* Thread stops after first successful answer that contains the provisioning
* URL.
*
* @return provisioning URL or null if no provisioning URL was discovered
*/
public String discoverProvisioningURL()
{
StringBuffer url = new StringBuffer();
try
{
jmdns = JmDNS.create();
}
catch(IOException e)
{
logger.info("Failed to create JmDNS", e);
return null;
}
ServiceInfo info = jmdns.getServiceInfo("_https._tcp.local",
"Provisioning URL", MDNS_TIMEOUT);
if(info == null)
{
/* try HTTP */
info = jmdns.getServiceInfo("_http._tcp.local", "Provisioning URL",
MDNS_TIMEOUT);
}
if(info != null && info.getName().equals("Provisioning URL"))
{
String protocol = info.getApplication();
url.append(info.getURL(protocol));
Enumeration<String> en = info.getPropertyNames();
if(en.hasMoreElements())
{
url.append("?");
}
/* add the parameters */
while(en.hasMoreElements())
{
String tmp = en.nextElement();
/* take all other parameters except "path" */
if(tmp.equals("path"))
{
continue;
}
url.append(tmp);
url.append("=");
url.append(info.getPropertyString(tmp));
if(en.hasMoreElements())
{
url.append("&");
}
}
}
/* close jmdns */
try
{
jmdns.close();
jmdns = null;
}
catch(Exception e)
{
logger.warn("Failed to close JmDNS", e);
}
return (url.toString().length() > 0) ? url.toString() : null;
}
/**
* Add a listener that will be notified when the
* <tt>discoverProvisioningURL</tt> has finished.
*
* @param listener <tt>ProvisioningListener</tt> to add
*/
public void addDiscoveryListener(DiscoveryListener listener)
{
if(!listeners.contains(listener))
{
listeners.add(listener);
}
}
/**
* Add a listener that will be notified when the
* <tt>discoverProvisioningURL</tt> has finished.
*
* @param listener <tt>ProvisioningListener</tt> to add
*/
public void removeDiscoveryListener(DiscoveryListener listener)
{
if(listeners.contains(listener))
{
listeners.remove(listener);
}
}
}
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