src/org/average/nfcauthcr/Enroll.java

   1 package org.average.nfcauthcr;
   2
   3 import java.util.Random;
   4
   5 import android.os.Bundle;
   6 import android.app.Activity;
   7 import android.app.AlertDialog;
   8 import android.content.Context;
   9 import android.content.ComponentName;
  10 import android.content.Intent;
  11 import android.content.ServiceConnection;
  12 import android.content.SharedPreferences;
  13 import android.content.SharedPreferences.Editor;
  14 import android.content.DialogInterface;
  15 import android.preference.PreferenceManager;
  16 import android.util.Log;
  17 import android.view.View;
  18 import android.widget.TextView;
  19 import android.widget.RadioButton;
  20
  21 import org.average.nfcauthcr.Check;
  22 import org.average.nfcauthcr.CheckConnector;
  23
  24 public class Enroll extends Activity {
  25
  26         private final String TAG = getClass().getName();
  27
  28         private Enroll thisActivity = this;
  29         private static boolean waitingForResult = false;
  30         private static SharedPreferences prefs;
  31         private static int slot;
  32         private AlertDialog swipeDialog;
  33         private CheckConnector checkConnector;
  34         private boolean mBound = false;
  35         private byte[] challenge = new byte[63];
  36
  37         private ServiceConnection mConnection = new ServiceConnection() {
  38                 @Override
  39                 public void onServiceConnected(ComponentName className,
  40                                                 IBinder service) {
  41                         checkConnector = (CheckConnector) service;
  42                         checkConnector.setCaller(activity);
  43                         mBound = true;
  44                 }
  45
  46                 @Override
  47                 public void onServiceDisconnected(ComponentName arg0) {
  48                         mBound = false;
  49                 }
  50         };
  51
  52         @Override
  53         protected void onCreate(Bundle savedInstanceState)
  54         {
  55                 super.onCreate(savedInstanceState);
  56                 Log.v(TAG, "Starting");
  57                 prefs = PreferenceManager.getDefaultSharedPreferences(this);
  58                 Intent intent = new Intent(this, Check.class);
  59                 bindService(intent, mConnection, Context.BIND_AUTO_CREATE);
  60         }
  61
  62         @Override
  63         protected void onResume() {
  64                 super.onResume();
  65                 setContentView(R.layout.main);
  66                 slot = prefs.getInt("slot_number", -1);
  67                 Log.v(TAG, "found saved slot value " + slot);
  68                 RadioButton btn = null;
  69                 switch (slot) {
  70                 case 1: btn = (RadioButton)findViewById(R.id.slot_1);
  71                         break;
  72                 case 2: btn = (RadioButton)findViewById(R.id.slot_2);
  73                         break;
  74                 }
  75                 if (btn != null) btn.setChecked(true);
  76         }
  77
  78         @Override
  79         protected void onPause() {
  80                 super.onPause();
  81                 Log.v(TAG, "Going inactive, try to stop");
  82                 if (!waitingForResult) {
  83                         finish();
  84                 }
  85         }
  86
  87         @Override
  88         protected void onStop() {
  89                 super.onStop();
  90                 Log.v(TAG, "Stop requested");
  91                 if (mBound) {
  92                         unbindService(mConnection);
  93                         mBound = false;
  94                 }
  95         }
  96
  97         public void onSlotSelectionClicked(View view) {
  98                 Log.v(TAG, "Radio Button selected");
  99                 if (! ((RadioButton) view).isChecked()) return;
 100                 switch(view.getId()) {
 101                 case R.id.slot_1: slot=1; break;
 102                 case R.id.slot_2: slot=2; break;
 103                 }
 104                 Editor editor = prefs.edit();
 105                 editor.putInt("slot_number", slot);
 106                 editor.commit();
 107                 Log.v(TAG, "stored slot number " + slot);
 108         }
 109
 110         public void onEnrollClicked(View view) {
 111                 Log.v(TAG, "Enroll clicked");
 112                 if (slot > 0) {
 113                         runEnrollment();
 114                 } else {
 115                         showEnrollResult(R.string.need_slot);
 116                 }
 117         }
 118
 119         public void runCallback(int rc, byte[] response) {
 120                 Log.v(TAG, "Got response");
 121                 waitingForResult = false;
 122                 if(swipeDialog != null) {
 123                         swipeDialog.dismiss();
 124                         swipeDialog = null;
 125                 }
 126                 if (rc != 0) {
 127                         Log.v(TAG, "Error result code " + rc);
 128                         return;
 129                 }
 130                 Log.v(TAG, "Challenge is \"" + hex(challenge) + "\"");
 131                 Log.v(TAG, "Response is  \"" + hex(response) + "\"");
 132                 Editor editor = prefs.edit();
 133                 editor.putString("challenge", hex(challenge));
 134                 editor.putString("response", hex(response));
 135                 editor.commit();
 136                 showEnrollResult(R.string.enroll_success);
 137                 Log.v(TAG, "stored new challenge and response");
 138         }
 139
 140         private void showEnrollResult(int messageid) {
 141                 AlertDialog.Builder builder = new AlertDialog.Builder(this);
 142                 builder.setTitle(R.string.enrollresult);
 143                 builder.setMessage(messageid);
 144                 builder.setPositiveButton(android.R.string.ok,
 145                                 new DialogInterface.OnClickListener() {
 146                         public void onClick(DialogInterface dialog, int which) {
 147                                 dialog.dismiss();
 148                                 if (!waitingForResult) { finish(); }
 149                         }
 150                 });
 151                 AlertDialog dialog = builder.create();
 152                 dialog.show();
 153         }
 154
 155         private void runEnrollment() {
 156                 Random rng = new Random();
 157                 rng.nextBytes(challenge);
 158                 Log.v(TAG, "Random challenge: " + hex(challenge));
 159                 waitingForResult = true;
 160                 checkConnector.runEnroll(slot, challenge);
 161                 if (swipeDialog != null) swipeDialog.dismiss();
 162                 swipeDialog = makeDialog();
 163                 swipeDialog.show();
 164         }
 165
 166         private AlertDialog makeDialog() {
 167                 AlertDialog.Builder builder = new AlertDialog.Builder(this);
 168                 builder.setTitle(R.string.challenging);
 169                 builder.setMessage(R.string.swipe);
 170                 builder.setOnCancelListener(
 171                                 new DialogInterface.OnCancelListener() {
 172                         public void onCancel(DialogInterface dialog) {
 173                                 Log.v(TAG, "unbind service FIXME");
 174                         }
 175                 });
 176                 return builder.create();
 177         }
 178
 179         private String hex(byte[] a) {
 180                 StringBuilder sb = new StringBuilder();
 181                 if (a == null) return "<null>";
 182                 for (byte b: a) sb.append(String.format("%02x", b&0xff));
 183                 return sb.toString();
 184         }
 185 }