src/org/average/nfcauthcr/NFCAuthCRCheck.java

   1 package org.average.nfcauthcr;
   2
   3 import java.io.IOException;
   4
   5 import android.os.Bundle;
   6 import android.app.Activity;
   7 import android.app.AlertDialog;
   8 import android.app.PendingIntent;
   9 import android.content.DialogInterface;
  10 import android.content.Intent;
  11 import android.content.IntentFilter;
  12 import android.nfc.NfcAdapter;
  13 import android.nfc.Tag;
  14 import android.nfc.TagLostException;
  15 import android.nfc.tech.IsoDep;
  16 import android.util.Log;
  17 import android.widget.Toast;
  18
  19 public class NFCAuthCRCheck extends Activity {
  20
  21         private final String TAG = getClass().getName();
  22
  23         private static final byte[] selectCommand =
  24                 {0x00, (byte) 0xA4, 0x04, 0x00, 0x07, (byte) 0xA0,
  25                  0x00, 0x00, 0x05, 0x27, 0x20, 0x01, 0x00};
  26
  27         private AlertDialog swipeDialog;
  28         private PendingIntent tagIntent;
  29
  30         @Override
  31         protected void onResume() {
  32                 super.onResume();
  33                 Log.v(TAG, "Starting the work");
  34
  35                 Intent intent = getIntent();
  36                 Bundle extras = intent.getExtras();
  37                 setResult(RESULT_CANCELED);
  38                 if(swipeDialog != null) {
  39                         swipeDialog.dismiss();
  40                         swipeDialog = null;
  41                 }
  42                 if(extras != null) {
  43                         int slot = extras.getInt("slot");
  44                         if (slot > 0) {
  45                                 swipeDialog = makeDialog();
  46                                 swipeDialog.show();
  47                                 enableDispatch(slot);
  48                         }
  49                 }
  50         }
  51
  52         @Override
  53         protected void onPause() {
  54                 super.onPause();
  55                 Log.v(TAG, "Finished the work");
  56
  57                 if(swipeDialog != null) {
  58                         swipeDialog.dismiss();
  59                         swipeDialog = null;
  60                 }
  61                 disableDispatch();
  62         }
  63
  64         public void onNewIntent(Intent intent) {
  65                 Log.v(TAG, "NFC Intent arrived");
  66                 int slot = intent.getIntExtra("slot", -1);
  67                 if (slot <= 0) return;
  68                 Tag tag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
  69                 if (tag == null) return;
  70                 IsoDep isoTag = IsoDep.get(tag);
  71                 try {
  72                         isoTag.connect();
  73                         byte[] resp = isoTag.transceive(selectCommand);
  74                         int length = resp.length;
  75                         if (resp[length - 2] == (byte)0x90 &&
  76                             resp[length - 1] == 0x00) {
  77                                 doChallengeYubiKey(isoTag, slot);
  78                         } else {
  79                                 Toast.makeText(this, R.string.tag_error,
  80                                                 Toast.LENGTH_LONG).show();
  81                         }
  82                 } catch (TagLostException e) {
  83                         Toast.makeText(this,
  84                                 R.string.tag_lost, Toast.LENGTH_LONG).show();
  85                 } catch (IOException e) {
  86                         Toast.makeText(this,
  87                                 getText(R.string.tag_error) +
  88                                 e.getMessage(),
  89                                 Toast.LENGTH_LONG).show();
  90                 }
  91                 finish();
  92         }
  93
  94         private AlertDialog makeDialog() {
  95                 AlertDialog.Builder builder = new AlertDialog.Builder(this);
  96                 builder.setTitle(R.string.challenging);
  97                 builder.setMessage(R.string.swipe);
  98                 builder.setOnCancelListener(
  99                                 new DialogInterface.OnCancelListener() {
 100                         public void onCancel(DialogInterface dialog) {
 101                                 finish();
 102                         }
 103                 });
 104                 return builder.create();
 105         }
 106
 107         private void enableDispatch(int slot) {
 108                 Intent intent = getIntent();
 109                 intent.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
 110                 intent.putExtra("slot", slot);
 111                 tagIntent = PendingIntent.getActivity(this, 0, intent, 0);
 112                 IntentFilter iso =
 113                         new IntentFilter(NfcAdapter.ACTION_TECH_DISCOVERED);
 114                 NfcAdapter adapter = NfcAdapter.getDefaultAdapter(this);
 115                 if (adapter == null) {
 116                         Toast.makeText(this, R.string.no_nfc,
 117                                                 Toast.LENGTH_LONG).show();
 118                         finish();
 119                         return;
 120                 }
 121                 if (! adapter.isEnabled()) {
 122                         Toast.makeText(this, R.string.nfc_disabled,
 123                                                 Toast.LENGTH_LONG).show();
 124                         finish();
 125                         return;
 126                 }
 127                 adapter.enableForegroundDispatch(
 128                         this, tagIntent, new IntentFilter[] {iso},
 129                         new String[][] {new String[] {IsoDep.class.getName()}});
 130         }
 131
 132         private void disableDispatch() {
 133                 if (tagIntent != null) {
 134                         tagIntent.cancel();
 135                         tagIntent = null;
 136                 }
 137                 NfcAdapter adapter = NfcAdapter.getDefaultAdapter(this);
 138                 if (adapter != null) {
 139                         adapter.disableForegroundDispatch(this);
 140                 }
 141         }
 142
 143         private void doChallengeYubiKey(IsoDep isoTag, int slot)
 144                                                 throws IOException {
 145                 Intent data = getIntent();
 146                 data.putExtra("response","<FIXME>real data here");
 147                 setResult(RESULT_OK, data);
 148         }
 149 }