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 /*
  93 <receiver android:name=".IsoDepReceiver"
  94           android:label="IsoDepReceiver">
  95      <intent-filter>
  96          <action android:name="android.nfc.action.TECH_DISCOVERED" />
  97      </intent-filter>
  98
  99      <meta-data android:name="android.nfc.action.TECH_DISCOVERED"
 100          android:resource="@xml/filter_nfc"
 101      />
 102  </receiver>
 103
 104 <resources xmlns:xliff="urn:oasis:names:tc:xliff:document:1.2">
 105      <!-- capture anything using IsoDep -->
 106      <tech-list>
 107          <tech>android.nfc.tech.IsoDep</tech>
 108      </tech-list>
 109  </resources>
 110
 111 */
 112
 113         private void enableDispatch(int slot) {
 114                 Intent intent = getIntent();
 115                 intent.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
 116                 intent.putExtra("slot", slot);
 117                 tagIntent = PendingIntent.getActivity(this, 0, intent, 0);
 118                 IntentFilter iso =
 119                         new IntentFilter(NfcAdapter.ACTION_TECH_DISCOVERED);
 120                 NfcAdapter adapter = NfcAdapter.getDefaultAdapter(this);
 121                 if (adapter == null) {
 122                         Toast.makeText(this, R.string.no_nfc,
 123                                                 Toast.LENGTH_LONG).show();
 124                         finish();
 125                 }
 126                 if (! adapter.isEnabled()) {
 127                         Toast.makeText(this, R.string.nfc_disabled,
 128                                                 Toast.LENGTH_LONG).show();
 129                         finish();
 130                 }
 131                 adapter.enableForegroundDispatch(
 132                         this, tagIntent, new IntentFilter[] {iso},
 133                         new String[][] {new String[] {IsoDep.class.getName()}});
 134         }
 135
 136         private void disableDispatch() {
 137                 if (tagIntent != null) {
 138                         tagIntent.cancel();
 139                         tagIntent = null;
 140                 }
 141                 NfcAdapter adapter = NfcAdapter.getDefaultAdapter(this);
 142                 if (adapter != null) {
 143                         adapter.disableForegroundDispatch(this);
 144                 }
 145         }
 146 }