--- /dev/null
+package org.average.nfcauthcr;
+
+import android.app.Activity;
+import android.app.AlertDialog;
+import android.app.PendingIntent;
+import android.content.DialogInterface;
+import android.content.Intent;
+import android.content.IntentFilter;
+import android.nfc.NfcAdapter;
+import android.nfc.Tag;
+import android.nfc.TagLostException;
+import android.nfc.tech.IsoDep;
+import android.util.Log;
+import android.widget.Toast;
+
+import org.average.nfcauthcr.YkNeo;
+
+public class Check extends Activity {
+
+ private final String TAG = getClass().getName();
+
+ private AlertDialog swipeDialog;
+ private PendingIntent tagIntent;
+
+ @Override
+ protected void onResume() {
+ super.onResume();
+ Log.v(TAG, "Starting the work");
+
+ Intent intent = getIntent();
+ setResult(RESULT_CANCELED);
+ if (swipeDialog != null) {
+ swipeDialog.dismiss();
+ swipeDialog = null;
+ }
+ int slot = intent.getIntExtra("slot", -1);
+ if (slot > 0) {
+ swipeDialog = makeDialog();
+ swipeDialog.show();
+ enableDispatch(slot);
+ }
+ }
+
+ @Override
+ protected void onPause() {
+ super.onPause();
+ Log.v(TAG, "Finished the work");
+
+ if(swipeDialog != null) {
+ swipeDialog.dismiss();
+ swipeDialog = null;
+ }
+ disableDispatch();
+ }
+
+ public void onNewIntent(Intent intent) {
+ Log.v(TAG, "NFC Intent arrived");
+ int slot = intent.getIntExtra("slot", -1);
+ byte[] challenge = intent.getByteArrayExtra("challenge");
+ if (slot <= 0) return;
+ Tag tag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
+ if (tag == null) return;
+ IsoDep isoTag = IsoDep.get(tag);
+ byte[] response = YkNeo.doChallengeYubiKey(
+ isoTag, slot, challenge);
+ if (response != null) {
+ Intent data = getIntent();
+ data.putExtra("response", response);
+ setResult(RESULT_OK, data);
+ }
+ finish();
+ }
+
+ private AlertDialog makeDialog() {
+ AlertDialog.Builder builder = new AlertDialog.Builder(this);
+ builder.setTitle(R.string.challenging);
+ builder.setMessage(R.string.swipe);
+ builder.setOnCancelListener(
+ new DialogInterface.OnCancelListener() {
+ public void onCancel(DialogInterface dialog) {
+ finish();
+ }
+ });
+ return builder.create();
+ }
+
+ private void enableDispatch(int slot) {
+ Intent intent = getIntent();
+ intent.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
+ intent.putExtra("slot", slot);
+ tagIntent = PendingIntent.getActivity(this, 0, intent, 0);
+ IntentFilter iso =
+ new IntentFilter(NfcAdapter.ACTION_TECH_DISCOVERED);
+ NfcAdapter adapter = NfcAdapter.getDefaultAdapter(this);
+ if (adapter == null) {
+ Toast.makeText(this, R.string.no_nfc,
+ Toast.LENGTH_LONG).show();
+ finish();
+ return;
+ }
+ if (! adapter.isEnabled()) {
+ Toast.makeText(this, R.string.nfc_disabled,
+ Toast.LENGTH_LONG).show();
+ finish();
+ return;
+ }
+ adapter.enableForegroundDispatch(
+ this, tagIntent, new IntentFilter[] {iso},
+ new String[][] {new String[] {IsoDep.class.getName()}});
+ }
+
+ private void disableDispatch() {
+ if (tagIntent != null) {
+ tagIntent.cancel();
+ tagIntent = null;
+ }
+ NfcAdapter adapter = NfcAdapter.getDefaultAdapter(this);
+ if (adapter != null) {
+ adapter.disableForegroundDispatch(this);
+ }
+ }
+}