Detectar a presença do token

[icemagno]

Algumas vezes, é útil saber simplesmente se algum token foi inserido ou removido da USB.
Seria bom ter um listener para disparar eventos de inserção / remoção do token.

Eu tentei ler um keystore, mas ele pede senha quando tento fazer isso.

[icemagno]

Eu implementei uma classe para disparar eventos quando meu Token é conectado / desconectado da porta USB usando a biblioteca JavaDoesUSB ( https://github.com/manuelbl/JavaDoesUSB ). Funcionou para mim e eu tentei deixar de uma forma mais genérica possível, mas obviamente serão necessários mais testes.

Essa biblioteca EXIGE Java >= 21

Segue a classe que eu desenvolvi:

[icemagno]

package br.com.j1scorpii.usbdevice;

import java.util.HashMap;
import java.util.Map;

import org.json.JSONObject;

import net.codecrete.usb.Usb;
import net.codecrete.usb.UsbAlternateInterface;
import net.codecrete.usb.UsbDevice;
import net.codecrete.usb.UsbInterface;

public class DeviceManager {
	private IDeviceEventObserver observer;
	private boolean devicePresent = false;
	private Map<Integer,JSONObject> devices = new HashMap<Integer,JSONObject>();
	
	public static enum DeviceEventType{
		CONNECTED,
		DISCONNECTED
	}
	
	public boolean isDevicePresent() {
		return devicePresent;
	}
	
	public DeviceManager( IDeviceEventObserver observer ) {
		this.observer = observer;
	}

	public void monitorAll() {
		monitorClass( -1 );
	}

	
	public void monitorClass( int classCode ) {
		try {
	        for ( var device : Usb.getDevices() ) checkDevice(device, DeviceEventType.CONNECTED, classCode );
	        
	        Usb.setOnDeviceConnected( device -> {
	        	checkDevice( device, DeviceEventType.CONNECTED, classCode ); 
	        });
	        
	        Usb.setOnDeviceDisconnected( device -> {
	        	checkDevice( device, DeviceEventType.DISCONNECTED, classCode );
	        });
	        
		} catch( IllegalStateException t ) {
			// PLEASE BE QUIET !!
		}
	}
	
    private void checkDevice(UsbDevice device, DeviceEventType event, int classCodeFilter ) {
    	int vendorId = device.getVendorId(); 				// 1059H / 4185D Giesecke & Devrient GmbH
    	int productId = device.getProductId();				// 000bH /   23D StarSign Bio Token 3.0
    	String manufacturer = device.getManufacturer(); 	// Giesecke & Devrient GmbH
    	
    	String product = "";
    	try { product = device.getProduct().toUpperCase().trim().replaceAll(" ", "_"); } catch ( Exception e ) {}
    	
        UsbInterface intf = device.getInterface(0);
        UsbAlternateInterface alt = intf.getCurrentAlternate();    	
    	int classCode = alt.getClassCode();
    	
    	// 4185 23 11 Giesecke & Devrient GmbH STARSIGN_CUT
    	// System.out.println( vendorId + " " + productId + " " + classCode + " " + manufacturer + " " + product );
    	// describe( device );
    	JSONObject deviceJson = new JSONObject()
    			.put("vendorId",vendorId)
    			.put("productId",productId)
    			.put("classCode",classCode)
    			.put("manufacturer",manufacturer)
    			.put("product",product);

    	if ( event == DeviceEventType.CONNECTED ) this.devices.put(classCode, deviceJson);
    	if ( event == DeviceEventType.DISCONNECTED ) this.devices.remove(classCode, deviceJson);
    	
    	if ( classCodeFilter == -1 ) observer.notifyEvent( event, deviceJson ); 
    	else 
    	if ( classCode == classCodeFilter ) { // 11 = Chip/SmartCard
    		this.devicePresent = ( event == DeviceEventType.CONNECTED );
    		observer.notifyEvent( event, deviceJson );
    	}
        
    }
    
    public Map<Integer, JSONObject> getDevices() {
		return devices;
	}

}

[icemagno]

Para usar:

Implemente sua classe como a interface IDeviceEventObserver

public interface IDeviceEventObserver {
	void notifyEvent( DeviceEventType eventType, JSONObject deviceJson );
}

Chame o monitor de dispositivos:

   DeviceManager deviceManager = new DeviceManager( this );
   deviceManager.monitorAll();

   ou

   deviceManager.monitor(  classe  );    // Onde 11 = "Chip/SmartCard"

Resultado ( monitora a classe 11 de Token/Smartcard ):

Evt: CONNECTED Presente?: true
{
     "classCode": 11,
     "product": "",
     "productId": 23,
     "vendorId": 4185,
     "manufacturer": "Giesecke & Devrient GmbH"
}
Evt: DISCONNECTED Presente?: false
{
     "classCode": 11,
     "product": "",
     "productId": 23,
     "vendorId": 4185,
     "manufacturer": "Giesecke & Devrient GmbH"
}

[icemagno]

Monitora tudo:

Evt: CONNECTED 
{
     "classCode": 3,
     "product": "DELL_MS116_USB_OPTICAL_MOUSE",
     "productId": 12314,
     "vendorId": 16700,
     "manufacturer": "PixArt"
}
Evt: CONNECTED 
{
     "classCode": 3,
     "product": "DELL_KB216_WIRED_KEYBOARD",
     "productId": 8467,
     "vendorId": 16700,
     "manufacturer": "Љ"
}
Evt: CONNECTED 
{
     "classCode": 1,
     "product": "LOGI_USB_HEADSET",
     "productId": 2661,
     "vendorId": 1133,
     "manufacturer": "Logitech"
}