src/org/average/nfcauthcr/Check.java

   1 package org.average.nfcauthcr;
   2
   3 import android.app.Service;
   4 import android.app.PendingIntent;
   5 import android.content.Intent;
   6 import android.content.IntentFilter;
   7 import android.content.SharedPreferences;
   8 import android.content.SharedPreferences.Editor;
   9 import android.nfc.NfcAdapter;
  10 import android.nfc.Tag;
  11 import android.nfc.TagLostException;
  12 import android.nfc.tech.IsoDep;
  13 import android.os.Binder;
  14 import android.os.IBinder;
  15 import android.preference.PreferenceManager;
  16 import android.util.Log;
  17 import android.widget.Toast;
  18
  19 import org.average.nfcauthcr.CheckConnector;
  20 import org.average.nfcauthcr.YkNeo;
  21 import org.average.nfcauthcr.CRException;
  22
  23 public class Check extends Service {
  24
  25         private final String TAG = getClass().getName();
  26
  27         private final CheckConnector checkConnector = new CheckConnector();
  28         private SharedPreferences prefs;
  29         private int startId;
  30         private PendingIntent tagIntent;
  31
  32         @Override
  33         public void onCreate() {
  34                 Log.v(TAG, "Created");
  35                 prefs = PreferenceManager.getDefaultSharedPreferences(this);
  36         }
  37
  38         @Override
  39         public int onStartCommand (Intent intent, int flags, int startId) {
  40                 Log.v(TAG, "Starting service");
  41                 this.startId = startId;
  42                 int slot = prefs.getInt("slot_number", -1);
  43                 if (slot > 0) {
  44                         enableDispatch(slot);
  45                 } else {
  46                         stopSelf(startId);
  47                 }
  48                 return START_NOT_STICKY;
  49         }
  50
  51         @Override
  52         public IBinder onBind(Intent intent) {
  53                 Log.v(TAG, "Binding");
  54                 checkConnector.setService(this);
  55                 return checkConnector;
  56         }
  57
  58         @Override
  59         public void onDestroy() {
  60                 Log.v(TAG, "Finished the run");
  61                 disableDispatch();
  62         }
  63
  64         @Override
  65         protected void onNewIntent(Intent intent) {
  66                 Log.v(TAG, "NFC Intent arrived");
  67                 int slot = intent.getIntExtra("slot", -1);
  68                 byte[] challenge = intent.getByteArrayExtra("challenge");
  69                 if (slot <= 0) return;
  70                 Tag tag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
  71                 if (tag == null) return;
  72                 IsoDep isoTag = IsoDep.get(tag);
  73                 try {
  74                         byte[] response = YkNeo.doChallengeYubiKey(
  75                                                 isoTag, slot, challenge);
  76                         Intent data = getIntent();
  77                         data.putExtra("response", response);
  78                         setResult(RESULT_OK, data);
  79                 } catch (CRException e) {
  80                         Log.v(TAG, e.getMessage());
  81                         Toast.makeText(this, e.getMessage(),
  82                                         Toast.LENGTH_LONG).show();
  83                 }
  84                 finish();
  85         }
  86
  87         private AlertDialog makeDialog() {
  88                 AlertDialog.Builder builder = new AlertDialog.Builder(this);
  89                 builder.setTitle(R.string.challenging);
  90                 builder.setMessage(R.string.swipe);
  91                 builder.setOnCancelListener(
  92                                 new DialogInterface.OnCancelListener() {
  93                         public void onCancel(DialogInterface dialog) {
  94                                 finish();
  95                         }
  96                 });
  97                 return builder.create();
  98         }
  99
 100 /*
 101 <receiver android:name=".IsoDepReceiver"
 102           android:label="IsoDepReceiver">
 103      <intent-filter>
 104          <action android:name="android.nfc.action.TECH_DISCOVERED" />
 105      </intent-filter>
 106
 107      <meta-data android:name="android.nfc.action.TECH_DISCOVERED"
 108          android:resource="@xml/filter_nfc"
 109      />
 110  </receiver>
 111
 112 <resources xmlns:xliff="urn:oasis:names:tc:xliff:document:1.2">
 113      <!-- capture anything using IsoDep -->
 114      <tech-list>
 115          <tech>android.nfc.tech.IsoDep</tech>
 116      </tech-list>
 117  </resources>
 118
 119 */
 120
 121         private void enableDispatch(int slot) {
 122                 Intent intent = getIntent();
 123                 intent.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
 124                 intent.putExtra("slot", slot);
 125                 tagIntent = PendingIntent.getActivity(this, 0, intent, 0);
 126                 IntentFilter iso =
 127                         new IntentFilter(NfcAdapter.ACTION_TECH_DISCOVERED);
 128                 NfcAdapter adapter = NfcAdapter.getDefaultAdapter(this);
 129                 if (adapter == null) {
 130                         Toast.makeText(this, R.string.no_nfc,
 131                                                 Toast.LENGTH_LONG).show();
 132                         finish();
 133                 }
 134                 if (! adapter.isEnabled()) {
 135                         Toast.makeText(this, R.string.nfc_disabled,
 136                                                 Toast.LENGTH_LONG).show();
 137                         finish();
 138                 }
 139                 adapter.enableForegroundDispatch(
 140                         this, tagIntent, new IntentFilter[] {iso},
 141                         new String[][] {new String[] {IsoDep.class.getName()}});
 142         }
 143
 144         private void disableDispatch() {
 145                 if (tagIntent != null) {
 146                         tagIntent.cancel();
 147                         tagIntent = null;
 148                 }
 149                 NfcAdapter adapter = NfcAdapter.getDefaultAdapter(this);
 150                 if (adapter != null) {
 151                         adapter.disableForegroundDispatch(this);
 152                 }
 153         }
 154 }