Android Open Source - pswd Login Activity

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License

The source code is released under:

MIT License

Java Source Code

package com.waring.pswd;
//ww w .j  a  v a2s .  c om
import android.app.Activity;
import android.app.AlertDialog;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.os.Bundle;
import android.text.Html;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.view.inputmethod.InputMethodManager;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.EditText;
import android.widget.ScrollView;
import android.widget.TextView;
import android.widget.Toast;

/**
 * This Activity displays the Login screen where a User enters their
 * username/nickname and their master password.  It is started by the
 * {@link com.waring.pswd.MainActivity} when a user is not logged in.
 * <p />
 * If a previously generated user token is not found for the user, prompt
 * the user to generate a new token and start {@link com.waring.pswd.TokenService}.
 * <p />
 * If a previously generated user token is found for the user, return to
 * the {@link com.waring.pswd.MainActivity}.
 */
public class LoginActivity extends Activity {
  
  // UI Elements

    /** The EditText for the Username */
  private EditText ET_username;

    /** The EditText for the Master Password */
  private EditText ET_password;

    /** The CheckBox to remember the Username */
  private CheckBox CB_username;

    /** The CheckBox to remember the Master Password */
  private CheckBox CB_password;

    /** The Login Button */
  private Button BT_login;


  /** The Broadcast Receiver that receives the token generation progress */
  private BroadcastReceiver BR_TOKEN_GEN;


    /**
     * Set up the UI elements for the login form.  If there are saved credentials available,
     * fill them into the form.
     * @param savedInstanceState
     */
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    setFinishOnTouchOutside(false);
    setContentView(R.layout.login);
    
    
    // Reset Container Visibility
    ScrollView SV_formContainer = (ScrollView) findViewById(R.id.login_form_container);
    ScrollView SV_generateContainer = (ScrollView) findViewById(R.id.login_generate_container);
    
    SV_formContainer.setVisibility(View.VISIBLE);
    SV_generateContainer.setVisibility(View.GONE);
    
    
    // Set no registration message
    TextView reg = (TextView) findViewById(R.id.login_registration);
    reg.setText(Html.fromHtml("<i>No registration is necessary, just pick a user name to identify yourself and a <u>very strong</u> master password to secure your site-specifc passwords.  Just use the same user name and master password each time you generate a site password.</i>"));
    
    
    // Get form elements
    ET_username = (EditText) findViewById(R.id.login_username);
    ET_password = (EditText) findViewById(R.id.login_password);
    CB_username = (CheckBox) findViewById(R.id.login_remember_username);
    CB_password = (CheckBox) findViewById(R.id.login_remember_password);
    BT_login = (Button) findViewById(R.id.login_button);
    
    
    // Read saved user name and master password
    SharedPreferences sharedPref = this.getSharedPreferences(MainActivity.PREFS_NAME, Context.MODE_PRIVATE);
    String saved_username = PSWD.decrypt(sharedPref.getString(MainActivity.PREFS_ENC_USERNAME, ""));
    String saved_password = PSWD.decrypt(sharedPref.getString(MainActivity.PREFS_ENC_PASSWORD, ""));
    
    ET_username.setText(saved_username);
    ET_password.setText(saved_password);

        // Set remember checkboxes based on previously saved info
    if ( !saved_username.equals("") ) {
      CB_username.setChecked(true);
    }
    else {
      CB_username.setChecked(false);
    }
    
    if ( !saved_password.equals("") ) {
      CB_password.setChecked(true);
    }
    else {
      CB_password.setChecked(false);
    }
    
    // Alert remember password (let the user know this is a bad idea)
    CB_password.setOnCheckedChangeListener(new OnCheckedChangeListener() {
      @Override
      public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
        if ( isChecked ) {
          new AlertDialog.Builder(LoginActivity.this)
            .setTitle("Security Warning!")
            .setMessage("Are you really sure about this?!  The app will save your master password and anyone with access to this device will be able to generate your passwords! THIS IS NOT RECOMMENDED!")
            .setPositiveButton("Save", new DialogInterface.OnClickListener() {
              @Override
              public void onClick(DialogInterface dialog, int which) {
                CB_password.setChecked(true);
              }
            })
            .setNegativeButton("Don't Save", new DialogInterface.OnClickListener() {
              @Override
              public void onClick(DialogInterface dialog, int which) {
                CB_password.setChecked(false);
              }
            })
            .show();
        }
      }
    });


        /**
         * Process login
         * If a user token is found in the cache, return to the MainActivity
         * If a user token is not found, show the Generate User Token Screen, then start the TokenService
         */
    BT_login.setOnClickListener(new OnClickListener() {
      @Override
      public void onClick(View v) {
        final String username = ET_username.getText().toString();
        final String password = ET_password.getText().toString();
        
        SharedPreferences sharedPref = getBaseContext().getSharedPreferences(MainActivity.PREFS_NAME, Context.MODE_PRIVATE);
        final Editor edit = sharedPref.edit();
        
        
        // User name and Password Cannot be empty
        if ( username.equals("") ) {
          Toast.makeText(getBaseContext(), "Username cannot be blank", Toast.LENGTH_LONG).show();
          return;
        }
        
        if ( password.equals("") ) {
          Toast.makeText(getBaseContext(), "Master Password cannot be blank", Toast.LENGTH_LONG).show();
          return;
        }
        
        
        // Save user name, if requested
        if ( CB_username.isChecked() ) {
          edit.putString(MainActivity.PREFS_ENC_USERNAME, PSWD.encrypt(username));
        }
        else {
          edit.putString(MainActivity.PREFS_ENC_USERNAME, "");
        }
        
        // Save master password, if requested
        if ( CB_password.isChecked() ) {
          edit.putString(MainActivity.PREFS_ENC_PASSWORD, PSWD.encrypt(password));
        }
        else {
          edit.putString(MainActivity.PREFS_ENC_PASSWORD, "");
        }
        
        edit.commit();
        
        
        
        // Check for saved User Token
        boolean hasToken = PSWD.hasUserToken(LoginActivity.this, username);
        
        
        // Use Cached Token
        if ( hasToken ) {
          String usertoken = PSWD.getUserToken(LoginActivity.this, username);
          
          // Return to the Main Activity
          Intent returnIntent = new Intent();
          returnIntent.putExtra("username", username);
          returnIntent.putExtra("password", password);
          returnIntent.putExtra("token", usertoken);
          setResult(RESULT_OK, returnIntent);
          finish();
        }
        
        // Generate User Token
        else {
          
          // SHOW THE GENERATE USER TOKEN SCREEN
          final ScrollView SV_formContainer = (ScrollView) findViewById(R.id.login_form_container);
          final ScrollView SV_generateContainer = (ScrollView) findViewById(R.id.login_generate_container);
          
          SV_formContainer.setVisibility(View.GONE);
          SV_generateContainer.setVisibility(View.VISIBLE);
          
          
          // Hide Soft Keyboard
          InputMethodManager imm = (InputMethodManager)getSystemService(Context.INPUT_METHOD_SERVICE);
          imm.hideSoftInputFromWindow(ET_password.getWindowToken(), 0);
          
          
          // Verify Password Field
          final EditText ET_password_verify = (EditText) findViewById(R.id.login_password_verify);
          ET_password_verify.setEnabled(true);
          
          // Back Button
          final Button BT_back = (Button) findViewById(R.id.login_button_back);
          BT_back.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
              SV_formContainer.setVisibility(View.VISIBLE);
              SV_generateContainer.setVisibility(View.GONE);
            }
          });
          
          // Generate Button
          final Button BT_generate = (Button) findViewById(R.id.login_button_generate);
          BT_generate.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
              // Get the second password
              String password2 = ET_password_verify.getText().toString();
              
              // Make sure passwords match
              if ( !password.equals(password2) ) {
                Toast.makeText(LoginActivity.this, "Passwords don't match", Toast.LENGTH_LONG).show();
                return;
              }
              
              
              // Disable Password Field and Buttons
              ET_password_verify.setEnabled(false);
              BT_generate.setEnabled(false);
              BT_back.setEnabled(false);
              
              
              // START THE TOKEN GENERATING SERVICE
              Intent i = new Intent(getBaseContext(), TokenService.class);
              i.putExtra("username", username);
              i.putExtra("password", password);
              getBaseContext().startService(i);
              
              
              // Return to MainActivity
              Intent returnIntent = new Intent();
              returnIntent.putExtra("username", username);
              returnIntent.putExtra("password", password);
              returnIntent.putExtra("token", "loading");
              setResult(RESULT_OK, returnIntent);
              finish();
            }
          });
        }
      }
    });
    
    
    
  }


    /**
     * Register the Token Broadcast Receiver
     */
  @Override
  public void onResume() {
    super.onResume();
    
    // Register Token BR
    // Close the LoginActivity when a Token is being generated
     IntentFilter intentFilter = new IntentFilter(MainActivity.BR_INTENT);
        BR_TOKEN_GEN = new BroadcastReceiver() {
             @Override
             public void onReceive(Context context, Intent intent) {
               Intent returnIntent = new Intent();
               returnIntent.putExtra("username", intent.getStringExtra("username"));
               returnIntent.putExtra("password", intent.getStringExtra("password"));
               returnIntent.putExtra("token", "loading");
               LoginActivity.this.setResult(RESULT_OK, returnIntent);
               LoginActivity.this.finish();
             }
         };
         this.registerReceiver(BR_TOKEN_GEN, intentFilter);
  }


    /**
     * Unregister the Token Broadcast Receiver
     */
  @Override
  public void onPause() {
    super.onPause();
    
    // Unregister the DB Update Receiver
      this.unregisterReceiver(BR_TOKEN_GEN);
  }
  
  
  
  
  
  
  @Override
  public void onBackPressed() {
      moveTaskToBack(true);
  }
}

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