DefaultAppLock.java

package org.wordpress.android.lockmanager;

import java.util.Date;

import android.app.Activity;
import android.app.Application;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.preference.PreferenceManager;

import org.wordpress.android.util.StringUtils;

public class DefaultAppLock extends AbstractAppLock {

    private Application currentApp; //Keep a reference to the app that invoked the locker
    private SharedPreferences settings;
    private Date lostFocusDate;
    private static final String PASSWORD_SALT = "sadasauidhsuyeuihdahdiauhs";

    public DefaultAppLock(Application currentApp) {
        super();
        SharedPreferences settings = PreferenceManager
                .getDefaultSharedPreferences(currentApp);
        this.settings = settings;
        this.currentApp = currentApp;
    }

    public void enable() {
        if (isPasswordLocked()) {
            currentApp.unregisterActivityLifecycleCallbacks(this);
            currentApp.registerActivityLifecycleCallbacks(this);
        }
    }

    public void disable() {
        currentApp.unregisterActivityLifecycleCallbacks(this);
    }

    public void forcePasswordLock() {
        lostFocusDate = null;
    }

    public boolean verifyPassword(String password) {
        String storedPassword = settings.getString(APP_LOCK_PASSWORD_PREF_KEY,
                "");
        password = PASSWORD_SALT + password + PASSWORD_SALT;
        password = StringUtils.getMd5Hash(password);
        if (password.equalsIgnoreCase(storedPassword)) {
            lostFocusDate = new Date();
            return true;
        } else {
            return false;
        }
    }

    public boolean setPassword(String password) {
        SharedPreferences.Editor editor = settings.edit();

        if (password == null) {
            editor.remove(APP_LOCK_PASSWORD_PREF_KEY);
            editor.commit();
            this.disable();
        } else {
            password = PASSWORD_SALT + password + PASSWORD_SALT;
            editor.putString(APP_LOCK_PASSWORD_PREF_KEY,
                    StringUtils.getMd5Hash(password));
            editor.commit();
            this.enable();
        }

        return true;
    }

    public boolean isPasswordLocked() {
        //Check if we need to show the lock screen at startup
        if (settings.getString(APP_LOCK_PASSWORD_PREF_KEY, "").equals(""))
            return false;

        return true;
    }

    private boolean mustShowUnlockSceen() {

        if (isPasswordLocked() == false)
            return false;

        if (lostFocusDate == null)
            return true; //first startup or when we forced to show the password

        int currentTimeOut = lockTimeOut; //get a reference to the current password timeout and reset it to default
        lockTimeOut = DEFAULT_TIMEOUT;
        Date now = new Date();
        long now_ms = now.getTime();
        long lost_focus_ms = lostFocusDate.getTime();
        int secondsPassed = (int) (now_ms - lost_focus_ms) / (1000);
        if (secondsPassed >= currentTimeOut) {
            lostFocusDate = null;
            return true;
        }

        return false;
    }

    @Override
    public void onActivityPaused(Activity arg0) {

        if (arg0.getClass() == AppUnlockActivity.class)
            return;

        lostFocusDate = new Date();

    }

    @Override
    public void onActivityResumed(Activity arg0) {

        if (arg0.getClass() == AppUnlockActivity.class)
            return;

        if (mustShowUnlockSceen()) {
            //uhhh ohhh!
            Intent i = new Intent(arg0.getApplicationContext(),
                    AppUnlockActivity.class);
            i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            arg0.getApplication().startActivity(i);
            return;
        }

    }

    @Override
    public void onActivityCreated(Activity arg0, Bundle arg1) {
    }

    @Override
    public void onActivityDestroyed(Activity arg0) {
    }

    @Override
    public void onActivitySaveInstanceState(Activity arg0, Bundle arg1) {
    }

    @Override
    public void onActivityStarted(Activity arg0) {
    }

    @Override
    public void onActivityStopped(Activity arg0) {
    }
}