I am making my first PhoneGap app for Android and it needs mDNS resolution. As ".local" addresses are not resolved on Android (before v4.1), I have used a ZeroConf library with JmDNS.jar file. I have taken reference for plugin from this GitHub repository, you might wanna have a look.
ZeroConf.java
public PluginResult execute(String action, JSONArray args, String callbackId) {
this.callback = callbackId;
if (action.equals("watch")) {
String type = args.optString(0);
if (type != null) {
watch(type);
} else {
return new PluginResult(PluginResult.Status.ERROR, "Service type not specified");
}
} else if (action.equals("unwatch")) {
String type = args.optString(0);
if (type != null) {
unwatch(type);
} else {
return new PluginResult(PluginResult.Status.ERROR, "Service type not specified");
}
} else if (action.equals("register")) {
JSONObject obj = args.optJSONObject(0);
if (obj != null) {
String type = obj.optString("type");
String name = obj.optString("name");
int port = obj.optInt("port");
String text = obj.optString("text");
if(type == null) {
return new PluginResult(PluginResult.Status.ERROR, "Missing required service info");
}
register(type, name, port, text);
} else {
return new PluginResult(PluginResult.Status.ERROR, "Missing required service info");
}
} else if (action.equals("close")) {
if(jmdns != null) {
try {
jmdns.close();
} catch (IOException e) {
e.printStackTrace();
}
}
} else if (action.equals("unregister")) {
if(jmdns != null) {
jmdns.unregisterAllServices();
}
} else {
Log.e("ZeroConf", "Invalid action: " + action);
return new PluginResult(PluginResult.Status.INVALID_ACTION);
}
PluginResult result = new PluginResult(Status.NO_RESULT);
result.setKeepCallback(true);
return result;
}
private void watch(String type) {
if(jmdns == null) {
setupWatcher();
}
Log.d("ZeroConf", "Watch " + type);
Log.d("ZeroConf", "Name: " + jmdns.getName() + " host: " + jmdns.getHostName());
jmdns.addServiceListener(type, listener);
}
private void unwatch(String type) {
if(jmdns == null) {
return;
}
jmdns.removeServiceListener(type, listener);
}
private void register (String type, String name, int port, String text) {
if(name == null) {
name = "";
}
if(text == null) {
text = "";
}
try {
ServiceInfo service = ServiceInfo.create(type, name, port, text);
jmdns.registerService(service);
} catch (IOException e) {
e.printStackTrace();
}
}
private void setupWatcher() {
Log.d("ZeroConf", "Setup watcher");
WifiManager wifi = (WifiManager) this.cordova.getActivity().getSystemService(android.content.Context.WIFI_SERVICE);
lock = wifi.createMulticastLock("ZeroConfPluginLock");
lock.setReferenceCounted(true);
lock.acquire();
try {
jmdns = JmDNS.create();
listener = new ServiceListener() {
public void serviceResolved(ServiceEvent ev) {
Log.d("ZeroConf", "Resolved");
sendCallback("added", ev.getInfo());
}
public void serviceRemoved(ServiceEvent ev) {
Log.d("ZeroConf", "Removed");
sendCallback("removed", ev.getInfo());
}
public void serviceAdded(ServiceEvent event) {
Log.d("ZeroConf", "Added");
// Force serviceResolved to be called again
jmdns.requestServiceInfo(event.getType(), event.getName(), 1);
}
};
} catch (IOException e) {
e.printStackTrace();
return;
}
}
public void sendCallback(String action, ServiceInfo info) {
JSONObject status = new JSONObject();
try {
status.put("action", action);
status.put("service", jsonifyService(info));
Log.d("ZeroConf", "Sending result: " + status.toString());
PluginResult result = new PluginResult(PluginResult.Status.OK, status);
result.setKeepCallback(true);
this.success(result, this.callback);
} catch (JSONException e) {
e.printStackTrace();
}
}
public static JSONObject jsonifyService(ServiceInfo info) {
JSONObject obj = new JSONObject();
try {
obj.put("application", info.getApplication());
obj.put("domain", info.getDomain());
obj.put("port", info.getPort());
obj.put("name", info.getName());
obj.put("server", info.getServer());
obj.put("description", info.getNiceTextString());
obj.put("protocol", info.getProtocol());
obj.put("qualifiedname", info.getQualifiedName());
obj.put("type", info.getType());
JSONArray addresses = new JSONArray();
String[] add = info.getHostAddresses();
for(int i = 0; i < add.length; i++) {
addresses.put(add[i]);
}
obj.put("addresses", addresses);
JSONArray urls = new JSONArray();
String[] url = info.getURLs();
for(int i = 0; i < url.length; i++) {
urls.put(url[i]);
}
obj.put("urls", urls);
} catch (JSONException e) {
e.printStackTrace();
return null;
}
return obj;
}
ZeroConf.js
var ZeroConf = {
watch: function(type, callback) {
return cordova.exec(function(result) {
if(callback) {
callback(result);
}
}, ZeroConf.fail, "ZeroConf", "watch", [type]);
},
unwatch: function(type) {
return cordova.exec(null, ZeroConf.fail, "ZeroConf", "unwatch", [type]);
},
close: function() {
return cordova.exec(null, ZeroConf.fail, "ZeroConf", "close", [])
},
register: function(type, name, port, text) {
if(!type) {
console.error("'type' is a required field");
return;
}
return cordova.exec(null, ZeroConf.fail, "ZeroConf", "register", [type, name, port, text]);
}
unregister: function() {
return cordova.exec(null, ZeroConf.fail, "ZeroConf", "unregister", [])
},
fail: function (o) {
console.error("Error " + JSON.stringify(o));
}
}
config.xml
<plugins>
<plugin name="ZeroConf" value="com.triggertrap.ZeroConf"/>
</plugins>
NOW MY QUESTION:
I want to call a fixed URL, for example, http://foo.local/abc/ in index.html page and it should resolve to the local IP Address. How do I achieve this? I know it has to be done using JavaScript, but how to go about it? I have searched many many articles and reached till here. I would appreciate if you could guide me a little further.
