Android Open Source - CodeGeneratorAndroidApp Enter Key Activity

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Back to project page CodeGeneratorAndroidApp.

License

The source code is released under:

Apache License

Java Source Code

package net.codemonkey.otpgeneratorapp;
//from ww w  . j  a v  a2 s .  c o m
import java.io.IOException;
import net.tushar.util.otp.Base32String;
import net.tushar.util.otp.Base32String.DecodingException;
import net.tushar.util.otp.NetworkTimeProvider;
import net.tushar.util.otp.OtpType;
import org.apache.http.impl.client.DefaultHttpClient;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.ActivityNotFoundException;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.Log;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.Toast;

public class EnterKeyActivity extends Activity implements TextWatcher {
  private static final int MIN_KEY_BYTES = 10;
  private EditText mKeyEntryField;
  private Spinner mType;

  private SharedPreferences mPrefs;

  /**
   * Called when the activity is first created
   */
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    // setPageContentView(R.layout.enter_key);
    setContentView(R.layout.enter_key);

    // getting preferences
    mPrefs = this.getSharedPreferences(this.getPackageName(),
        Context.MODE_PRIVATE);

    // Find all the views on the page
    mKeyEntryField = (EditText) findViewById(R.id.key_value);
    mKeyEntryField.setText(mPrefs.getString("secret", ""));
    mType = (Spinner) findViewById(R.id.type_choice);

    ArrayAdapter<CharSequence> types = ArrayAdapter.createFromResource(
        this, R.array.type, android.R.layout.simple_spinner_item);
    types.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    mType.setAdapter(types);

    // Set listeners
    mKeyEntryField.addTextChangedListener(this);

    mType.setSelection(mPrefs.getInt("type", 0));
  }

  /*
   * Return key entered by user, replacing visually similar characters 1 and
   * 0.
   */
  private String getEnteredKey() {
    String enteredKey = mKeyEntryField.getText().toString();
    return enteredKey.replace('1', 'I').replace('0', 'O');
  }

  /*
   * Verify that the input field contains a valid base32 string, and meets
   * minimum key requirements.
   */
  private boolean validateKeyAndUpdateStatus(boolean submitting) {
    String userEnteredKey = getEnteredKey();
    // checking if empty or null
    if (userEnteredKey.equals("") || userEnteredKey == null) {
      mKeyEntryField.setError(getString(R.string.error_empty_secret));
      return false;
    }
    // if not null or empty checks rest
    else {
      try {
        byte[] decoded = Base32String.decode(userEnteredKey);
        if (decoded.length < MIN_KEY_BYTES) {
          // If the user is trying to submit a key that's too short,
          // then display a message saying it's too short.
          mKeyEntryField
              .setError(submitting ? getString(R.string.enter_key_too_short)
                  : null);
          return false;
        } else {
          mKeyEntryField.setError(null);
          return true;
        }
      } catch (DecodingException e) {
        mKeyEntryField
            .setError(getString(R.string.enter_key_illegal_char));
        return false;
      }

    }
  }

  protected void validateEverythingAndSave(View view) {

    if (validateKeyAndUpdateStatus(true)) {
      // Save things here
      Editor editor = mPrefs.edit();
      editor.putString("secret", mKeyEntryField.getText().toString());
      editor.putInt("type", mType.getSelectedItemPosition());
      editor.commit();
      Toast.makeText(this, R.string.secret_saved, Toast.LENGTH_SHORT)
          .show();
      setResult(RESULT_OK);
      finish();
    }
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public void afterTextChanged(Editable userEnteredValue) {
    validateKeyAndUpdateStatus(false);
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public void beforeTextChanged(CharSequence arg0, int arg1, int arg2,
      int arg3) {
    // Do nothing
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public void onTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) {
    // Do nothing
  }

  public void onSaveClick(View view) throws IOException {
    validateEverythingAndSave(view);

    new AsyncTask<Void, Void, Void>() {

      @Override
      protected Void doInBackground(Void... params) {
        NetworkTimeProvider ntp = new NetworkTimeProvider(
            new DefaultHttpClient());
        long time = 0;
        int correction = 0;
        try {
          time = ntp.getNetworkTime();
          correction = ntp.getTimeCorrectionMinutes();
        } catch (IOException e) {
          e.printStackTrace();
        }

        Editor editor = mPrefs.edit();
        editor.putInt("timecorrection", correction);
        editor.commit();
        Log.i("Time", correction + " " + Long.toString(time));
        return null;
      }
    }.execute();
  }

  public void onScanQR(View view) {
    final int SCAN_REQUEST = 31337;
    Intent intentScan = new Intent("com.google.zxing.client.android.SCAN");
    intentScan.putExtra("SCAN_MODE", "QR_CODE_MODE");
    intentScan.putExtra("SAVE_HISTORY", false);
    try {
      startActivityForResult(intentScan, SCAN_REQUEST);
    } catch (ActivityNotFoundException error) {
      Dialog dialog = null;
      AlertDialog.Builder dlBuilder = new AlertDialog.Builder(this);
      dlBuilder.setTitle("Install Barcode Scanner?");
      dlBuilder
          .setMessage("To scan QR codes containing keys, you must install ZXing barcode scanner");
      dlBuilder.setIcon(android.R.drawable.ic_dialog_alert);
      dlBuilder.setPositiveButton("Install",
          new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog,
                int whichButton) {
              Intent intent = new Intent(
                  Intent.ACTION_VIEW,
                  Uri.parse("market://search?q=pname:com.google.zxing.client.android"));
              try {
                startActivity(intent);
              } catch (ActivityNotFoundException e) {
                //if no market app
                intent = new Intent(
                    Intent.ACTION_VIEW,
                    Uri.parse("https://zxing.googlecode.com/files/BarcodeScanner3.1.apk"));
                startActivity(intent);
              }
            }
          });
      dlBuilder.setNegativeButton("Cancel", null);
      dialog = dlBuilder.create();
      dialog.show();
    }

  }

  @SuppressLint("DefaultLocale")
  private void interpretScanResult(Uri scanResult) {
    final String SECRET_PARAM = "secret";
    final String OTP_SCHEME = "otpauth";
    final String scheme = scanResult.getScheme().toLowerCase();
    final String authority = scanResult.getAuthority();
    if (OTP_SCHEME.equals(scheme)) {
      String secret = scanResult.getQueryParameter(SECRET_PARAM);
      Log.i("Got Secret", secret);
      mKeyEntryField.setText(secret);
      if (OtpType.HOTP.name().toLowerCase().equals(authority)) {
        mType.setSelection(1);
      } else {
        mType.setSelection(0);
      }
    }
  }

  @Override
  protected void onActivityResult(int requestCode, int resultCode,
      Intent intent) {
    // super.onActivityResult(requestCode, resultCode, data);
    final int SCAN_REQUEST = 31337;
    if (requestCode == SCAN_REQUEST && resultCode == Activity.RESULT_OK) {
      // Grab the scan results and convert it into a URI
      String scanResult = (intent != null) ? intent
          .getStringExtra("SCAN_RESULT") : null;
      Uri uri = (scanResult != null) ? Uri.parse(scanResult) : null;
      interpretScanResult(uri);
    }
  }

  @Override
  public void onBackPressed() {
    super.onBackPressed();
    finish();
  }
}

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