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