src/org/average/nfcauthcr/Check.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.YkNeo;
  17 import org.average.nfcauthcr.CRException;
  18
  19 public class Check extends Activity {
  20
  21         private final String TAG = getClass().getName();
  22
  23         private AlertDialog swipeDialog;
  24         private PendingIntent tagIntent;
  25
  26         @Override
  27         protected void onResume() {
  28                 super.onResume();
  29                 Log.v(TAG, "Starting the work");
  30
  31                 Intent intent = getIntent();
  32                 setResult(RESULT_CANCELED);
  33                 if (swipeDialog != null) {
  34                         swipeDialog.dismiss();
  35                         swipeDialog = null;
  36                 }
  37                 int slot = intent.getIntExtra("slot", -1);
  38                 if (slot > 0) {
  39                         swipeDialog = makeDialog();
  40                         swipeDialog.show();
  41                         enableDispatch(slot);
  42                 }
  43         }
  44
  45         @Override
  46         protected void onPause() {
  47                 super.onPause();
  48                 Log.v(TAG, "Finished the work");
  49
  50                 if(swipeDialog != null) {
  51                         swipeDialog.dismiss();
  52                         swipeDialog = null;
  53                 }
  54                 disableDispatch();
  55         }
  56
  57         public void onNewIntent(Intent intent) {
  58                 Log.v(TAG, "NFC Intent arrived");
  59                 int slot = intent.getIntExtra("slot", -1);
  60                 byte[] challenge = intent.getByteArrayExtra("challenge");
  61                 if (slot <= 0) return;
  62                 Tag tag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
  63                 if (tag == null) return;
  64                 IsoDep isoTag = IsoDep.get(tag);
  65                 try {
  66                         byte[] response = YkNeo.doChallengeYubiKey(
  67                                                 isoTag, slot, challenge);
  68                         Intent data = getIntent();
  69                         data.putExtra("response", response);
  70                         setResult(RESULT_OK, data);
  71                 } catch (CRException e) {
  72                         Log.v(TAG, e.getMessage());
  73                         Toast.makeText(this, e.getMessage(),
  74                                         Toast.LENGTH_LONG).show();
  75                 }
  76                 finish();
  77         }
  78
  79         private AlertDialog makeDialog() {
  80                 AlertDialog.Builder builder = new AlertDialog.Builder(this);
  81                 builder.setTitle(R.string.challenging);
  82                 builder.setMessage(R.string.swipe);
  83                 builder.setOnCancelListener(
  84                                 new DialogInterface.OnCancelListener() {
  85                         public void onCancel(DialogInterface dialog) {
  86                                 finish();
  87                         }
  88                 });
  89                 return builder.create();
  90         }
  91
  92         private void enableDispatch(int slot) {
  93                 Intent intent = getIntent();
  94                 intent.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
  95                 intent.putExtra("slot", slot);
  96                 tagIntent = PendingIntent.getActivity(this, 0, intent, 0);
  97                 IntentFilter iso =
  98                         new IntentFilter(NfcAdapter.ACTION_TECH_DISCOVERED);
  99                 NfcAdapter adapter = NfcAdapter.getDefaultAdapter(this);
 100                 if (adapter == null) {
 101                         Toast.makeText(this, R.string.no_nfc,
 102                                                 Toast.LENGTH_LONG).show();
 103                         finish();
 104                 }
 105                 if (! adapter.isEnabled()) {
 106                         Toast.makeText(this, R.string.nfc_disabled,
 107                                                 Toast.LENGTH_LONG).show();
 108                         finish();
 109                 }
 110                 adapter.enableForegroundDispatch(
 111                         this, tagIntent, new IntentFilter[] {iso},
 112                         new String[][] {new String[] {IsoDep.class.getName()}});
 113         }
 114
 115         private void disableDispatch() {
 116                 if (tagIntent != null) {
 117                         tagIntent.cancel();
 118                         tagIntent = null;
 119                 }
 120                 NfcAdapter adapter = NfcAdapter.getDefaultAdapter(this);
 121                 if (adapter != null) {
 122                         adapter.disableForegroundDispatch(this);
 123                 }
 124         }
 125 }