src/org/average/nfcauthcr/NFCAuthCRCheck.java

   1 package org.average.nfcauthcr;
   2
   3 import android.app.Activity;
   4 import android.app.AlertDialog;
   5 import android.app.PendingIntent;
   6 import android.content.DialogInterface;
   7 import android.content.Intent;
   8 import android.content.IntentFilter;
   9 import android.nfc.NfcAdapter;
  10 import android.nfc.Tag;
  11 import android.nfc.TagLostException;
  12 import android.nfc.tech.IsoDep;
  13 import android.util.Log;
  14 import android.widget.Toast;
  15
  16 import org.average.nfcauthcr.NFCAuthCRYubiNeo;
  17
  18 public class NFCAuthCRCheck extends Activity {
  19
  20         private final String TAG = getClass().getName();
  21
  22         private AlertDialog swipeDialog;
  23         private PendingIntent tagIntent;
  24
  25         @Override
  26         protected void onResume() {
  27                 super.onResume();
  28                 Log.v(TAG, "Starting the work");
  29
  30                 Intent intent = getIntent();
  31                 setResult(RESULT_CANCELED);
  32                 if (swipeDialog != null) {
  33                         swipeDialog.dismiss();
  34                         swipeDialog = null;
  35                 }
  36                 int slot = intent.getIntExtra("slot", -1);
  37                 if (slot > 0) {
  38                         swipeDialog = makeDialog();
  39                         swipeDialog.show();
  40                         enableDispatch(slot);
  41                 }
  42         }
  43
  44         @Override
  45         protected void onPause() {
  46                 super.onPause();
  47                 Log.v(TAG, "Finished the work");
  48
  49                 if(swipeDialog != null) {
  50                         swipeDialog.dismiss();
  51                         swipeDialog = null;
  52                 }
  53                 disableDispatch();
  54         }
  55
  56         public void onNewIntent(Intent intent) {
  57                 Log.v(TAG, "NFC Intent arrived");
  58                 int slot = intent.getIntExtra("slot", -1);
  59                 byte[] challenge = intent.getByteArrayExtra("challenge");
  60                 if (slot <= 0) return;
  61                 Tag tag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
  62                 if (tag == null) return;
  63                 IsoDep isoTag = IsoDep.get(tag);
  64                 byte[] response = NFCAuthCRYubiNeo.doChallengeYubiKey(
  65                                                 isoTag, slot, challenge);
  66                 if (response != null) {
  67                         Intent data = getIntent();
  68                         data.putExtra("response", response);
  69                         setResult(RESULT_OK, data);
  70                 }
  71                 finish();
  72         }
  73
  74         private AlertDialog makeDialog() {
  75                 AlertDialog.Builder builder = new AlertDialog.Builder(this);
  76                 builder.setTitle(R.string.challenging);
  77                 builder.setMessage(R.string.swipe);
  78                 builder.setOnCancelListener(
  79                                 new DialogInterface.OnCancelListener() {
  80                         public void onCancel(DialogInterface dialog) {
  81                                 finish();
  82                         }
  83                 });
  84                 return builder.create();
  85         }
  86
  87         private void enableDispatch(int slot) {
  88                 Intent intent = getIntent();
  89                 intent.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
  90                 intent.putExtra("slot", slot);
  91                 tagIntent = PendingIntent.getActivity(this, 0, intent, 0);
  92                 IntentFilter iso =
  93                         new IntentFilter(NfcAdapter.ACTION_TECH_DISCOVERED);
  94                 NfcAdapter adapter = NfcAdapter.getDefaultAdapter(this);
  95                 if (adapter == null) {
  96                         Toast.makeText(this, R.string.no_nfc,
  97                                                 Toast.LENGTH_LONG).show();
  98                         finish();
  99                         return;
 100                 }
 101                 if (! adapter.isEnabled()) {
 102                         Toast.makeText(this, R.string.nfc_disabled,
 103                                                 Toast.LENGTH_LONG).show();
 104                         finish();
 105                         return;
 106                 }
 107                 adapter.enableForegroundDispatch(
 108                         this, tagIntent, new IntentFilter[] {iso},
 109                         new String[][] {new String[] {IsoDep.class.getName()}});
 110         }
 111
 112         private void disableDispatch() {
 113                 if (tagIntent != null) {
 114                         tagIntent.cancel();
 115                         tagIntent = null;
 116                 }
 117                 NfcAdapter adapter = NfcAdapter.getDefaultAdapter(this);
 118                 if (adapter != null) {
 119                         adapter.disableForegroundDispatch(this);
 120                 }
 121         }
 122 }