app/src/main/java/com/stoutner/privacybrowser/MainWebViewActivity.java

   1 /**
   2  * Copyright 2015-2016 Soren Stoutner <soren@stoutner.com>.
   3  *
   4  * This file is part of Privacy Browser <https://www.stoutner.com/privacy-browser>.
   5  *
   6  * Privacy Browser is free software: you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation, either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * Privacy Browser is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with Privacy Browser.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 package com.stoutner.privacybrowser;
  21
  22 import android.annotation.SuppressLint;
  23 import android.app.Activity;
  24 import android.app.DownloadManager;
  25 import android.content.Intent;
  26 import android.content.SharedPreferences;
  27 import android.content.res.Configuration;
  28 import android.graphics.Bitmap;
  29 import android.net.Uri;
  30 import android.os.Build;
  31 import android.os.Bundle;
  32 import android.preference.PreferenceManager;
  33 import android.support.design.widget.NavigationView;
  34 import android.support.design.widget.Snackbar;
  35 import android.support.v4.app.DialogFragment;
  36 import android.support.v4.view.GravityCompat;
  37 import android.support.v4.widget.DrawerLayout;
  38 import android.support.v4.widget.SwipeRefreshLayout;
  39 import android.support.v7.app.ActionBar;
  40 import android.support.v7.app.ActionBarDrawerToggle;
  41 import android.support.v7.app.AppCompatActivity;
  42 import android.support.v7.app.AppCompatDialogFragment;
  43 import android.support.v7.widget.Toolbar;
  44 import android.util.Patterns;
  45 import android.view.KeyEvent;
  46 import android.view.Menu;
  47 import android.view.MenuItem;
  48 import android.view.View;
  49 import android.view.inputmethod.InputMethodManager;
  50 import android.webkit.CookieManager;
  51 import android.webkit.DownloadListener;
  52 import android.webkit.WebChromeClient;
  53 import android.webkit.WebStorage;
  54 import android.webkit.WebView;
  55 import android.webkit.WebViewClient;
  56 import android.widget.EditText;
  57 import android.widget.FrameLayout;
  58 import android.widget.ImageView;
  59 import android.widget.ProgressBar;
  60
  61 import java.io.UnsupportedEncodingException;
  62 import java.net.MalformedURLException;
  63 import java.net.URL;
  64 import java.net.URLEncoder;
  65
  66 // We need to use AppCompatActivity from android.support.v7.app.AppCompatActivity to have access to the SupportActionBar until the minimum API is >= 21.
  67 public class MainWebViewActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener, CreateHomeScreenShortcut.CreateHomeScreenSchortcutListener {
  68     // favoriteIcon is public static so it can be accessed from CreateHomeScreenShortcut.
  69     public static Bitmap favoriteIcon;
  70     // mainWebView is public static so it can be accessed from AboutDialog.  It is also used in onCreate(), onOptionsItemSelected(), onNavigationItemSelected(), and loadUrlFromTextBox().
  71     public static WebView mainWebView;
  72
  73     // drawerToggle is used in onCreate(), onPostCreate(), onConfigurationChanged(), onNewIntent(), and onNavigationItemSelected().
  74     private ActionBarDrawerToggle drawerToggle;
  75     // drawerLayout is used in onCreate(), onNewIntent(), and onBackPressed().
  76     private DrawerLayout drawerLayout;
  77     // mainMenu is used in onCreateOptionsMenu() and onOptionsItemSelected().
  78     private Menu mainMenu;
  79     // formattedUrlString is used in onCreate(), onOptionsItemSelected(), onCreateHomeScreenShortcutCreate(), and loadUrlFromTextBox().
  80     private String formattedUrlString;
  81     // homepage is used in onCreate() and onOptionsItemSelected().
  82     private String homepage;
  83     // javaScriptEnabled is used in onCreate(), onCreateOptionsMenu(), onOptionsItemSelected(), and loadUrlFromTextBox().
  84     private boolean javaScriptEnabled;
  85     // domStorageEnabled is used in onCreate(), onCreateOptionsMenu(), and onOptionsItemSelected().
  86     private boolean domStorageEnabled;
  87
  88     /* saveFormDataEnabled does nothing until database storage is implemented.
  89     // saveFormDataEnabled is used in onCreate(), onCreateOptionsMenu(), and onOptionsItemSelected().
  90     private boolean saveFormDataEnabled;
  91     */
  92
  93     // cookieManager is used in onCreate(), onOptionsItemSelected(), and onNavigationItemSelected().
  94     private CookieManager cookieManager;
  95     // firstPartyCookiesEnabled is used in onCreate(), onCreateOptionsMenu(), onPrepareOptionsMenu(), and onOptionsItemSelected().
  96     private boolean firstPartyCookiesEnabled;
  97     // thirdPartyCookiesEnabled is uesd in onCreate(), onCreateOptionsMenu(), onPrepareOptionsMenu(), and onOptionsItemSelected().
  98     private boolean thirdPartyCookiesEnabled;
  99
 100     // urlTextBox is used in onCreate(), onOptionsItemSelected(), and loadUrlFromTextBox().
 101     private EditText urlTextBox;
 102
 103     @Override
 104     // Remove Android Studio's warning about the dangers of using SetJavaScriptEnabled.  The whole premise of Privacy Browser is built around an understanding of these dangers.
 105     @SuppressLint("SetJavaScriptEnabled")
 106     protected void onCreate(Bundle savedInstanceState) {
 107         super.onCreate(savedInstanceState);
 108         setContentView(R.layout.coordinator_layout);
 109
 110         // We need to use the SupportActionBar from android.support.v7.app.ActionBar until the minimum API is >= 21.
 111         Toolbar supportAppBar = (Toolbar) findViewById(R.id.appBar);
 112         setSupportActionBar(supportAppBar);
 113
 114         final FrameLayout fullScreenVideoFrameLayout = (FrameLayout) findViewById(R.id.fullScreenVideoFrameLayout);
 115
 116         // We need to use the SupportActionBar from android.support.v7.app.ActionBar until the minimum API is >= 21.
 117         final ActionBar appBar = getSupportActionBar();
 118
 119         // Setup AdView for the free flavor.
 120         final View adView = findViewById(R.id.adView);
 121
 122         // Implement swipe to refresh
 123         final SwipeRefreshLayout swipeToRefresh = (SwipeRefreshLayout) findViewById(R.id.swipeRefreshLayout);
 124         swipeToRefresh.setColorSchemeResources(R.color.blue);
 125         swipeToRefresh.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
 126             @Override
 127             public void onRefresh() {
 128                 mainWebView.reload();
 129             }
 130         });
 131
 132         mainWebView = (WebView) findViewById(R.id.mainWebView);
 133
 134         if (appBar != null) {
 135             // Add the custom url_bar layout, which shows the favoriteIcon, urlTextBar, and progressBar.
 136             appBar.setCustomView(R.layout.url_bar);
 137             appBar.setDisplayOptions(ActionBar.DISPLAY_SHOW_CUSTOM);
 138
 139             // Set the "go" button on the keyboard to load the URL in urlTextBox.
 140             urlTextBox = (EditText) appBar.getCustomView().findViewById(R.id.urlTextBox);
 141             urlTextBox.setOnKeyListener(new View.OnKeyListener() {
 142                 public boolean onKey(View v, int keyCode, KeyEvent event) {
 143                     // If the event is a key-down event on the "enter" button, load the URL.
 144                     if ((event.getAction() == KeyEvent.ACTION_DOWN) && (keyCode == KeyEvent.KEYCODE_ENTER)) {
 145                         // Load the URL into the mainWebView and consume the event.
 146                         try {
 147                             loadUrlFromTextBox();
 148                         } catch (UnsupportedEncodingException e) {
 149                             e.printStackTrace();
 150                         }
 151                         // If the enter key was pressed, consume the event.
 152                         return true;
 153                     } else {
 154                         // If any other key was pressed, do not consume the event.
 155                         return false;
 156                     }
 157                 }
 158             });
 159         }
 160
 161         // Create the navigation drawer.
 162         drawerLayout = (DrawerLayout) findViewById(R.id.drawerLayout);
 163         // The DrawerTitle identifies the drawer in accessibility mode.
 164         drawerLayout.setDrawerTitle(GravityCompat.START, getString(R.string.navigation_drawer));
 165
 166         // Listen for touches on the navigation menu.
 167         final NavigationView navigationView = (NavigationView) findViewById(R.id.navigationView);
 168         navigationView.setNavigationItemSelectedListener(this);
 169
 170         // drawerToggle creates the hamburger icon at the start of the AppBar.
 171         drawerToggle = new ActionBarDrawerToggle(this, drawerLayout, supportAppBar, R.string.open_navigation, R.string.close_navigation);
 172
 173         mainWebView.setWebViewClient(new WebViewClient() {
 174             // shouldOverrideUrlLoading makes this WebView the default handler for URLs inside the app, so that links are not kicked out to other apps.
 175             @Override
 176             public boolean shouldOverrideUrlLoading(WebView view, String url) {
 177                 mainWebView.loadUrl(url);
 178                 return true;
 179             }
 180
 181             // Update the URL in urlTextBox when the page starts to load.
 182             @Override
 183             public void onPageStarted(WebView view, String url, Bitmap favicon) {
 184                 urlTextBox.setText(url);
 185             }
 186
 187             // Update formattedUrlString and urlTextBox.  It is necessary to do this after the page finishes loading because the final URL can change during load.
 188             @Override
 189             public void onPageFinished(WebView view, String url) {
 190                 formattedUrlString = url;
 191
 192                 // Only update urlTextBox if the user is not typing in it.
 193                 if (!urlTextBox.hasFocus()) {
 194                     urlTextBox.setText(formattedUrlString);
 195                 }
 196             }
 197         });
 198
 199         mainWebView.setWebChromeClient(new WebChromeClient() {
 200             // Update the progress bar when a page is loading.
 201             @Override
 202             public void onProgressChanged(WebView view, int progress) {
 203                 // Make sure that appBar is not null.
 204                 if (appBar != null) {
 205                     ProgressBar progressBar = (ProgressBar) appBar.getCustomView().findViewById(R.id.progressBar);
 206                     progressBar.setProgress(progress);
 207                     if (progress < 100) {
 208                         progressBar.setVisibility(View.VISIBLE);
 209                     } else {
 210                         progressBar.setVisibility(View.GONE);
 211
 212                         //Stop the SwipeToRefresh indicator if it is running
 213                         swipeToRefresh.setRefreshing(false);
 214                     }
 215                 }
 216             }
 217
 218             // Set the favorite icon when it changes.
 219             @Override
 220             public void onReceivedIcon(WebView view, Bitmap icon) {
 221                 // Save a copy of the favorite icon for use if a shortcut is added to the home screen.
 222                 favoriteIcon = icon;
 223
 224                 // Place the favorite icon in the appBar if it is not null.
 225                 if (appBar != null) {
 226                     ImageView imageViewFavoriteIcon = (ImageView) appBar.getCustomView().findViewById(R.id.favoriteIcon);
 227                     imageViewFavoriteIcon.setImageBitmap(Bitmap.createScaledBitmap(icon, 64, 64, true));
 228                 }
 229             }
 230
 231             // Enter full screen video
 232             @Override
 233             public void onShowCustomView(View view, CustomViewCallback callback) {
 234                 if (appBar != null) {
 235                     appBar.hide();
 236                 }
 237
 238                 // Show the fullScreenVideoFrameLayout.
 239                 fullScreenVideoFrameLayout.addView(view);
 240                 fullScreenVideoFrameLayout.setVisibility(View.VISIBLE);
 241
 242                 // Hide the mainWebView.
 243                 mainWebView.setVisibility(View.GONE);
 244
 245                 // Hide the ad if this is the free flavor.
 246                 BannerAd.hideAd(adView);
 247
 248                 /* SYSTEM_UI_FLAG_HIDE_NAVIGATION hides the navigation bars on the bottom or right of the screen.
 249                 ** SYSTEM_UI_FLAG_FULLSCREEN hides the status bar across the top of the screen.
 250                 ** SYSTEM_UI_FLAG_IMMERSIVE_STICKY makes the navigation and status bars ghosted overlays and automatically rehides them.
 251                 */
 252
 253                 // Set the one flag supported by API >= 14.
 254                 view.setSystemUiVisibility(View.SYSTEM_UI_FLAG_HIDE_NAVIGATION);
 255
 256                 // Set the two flags that are supported by API >= 16.
 257                 if (Build.VERSION.SDK_INT >= 16) {
 258                     view.setSystemUiVisibility(View.SYSTEM_UI_FLAG_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_FULLSCREEN);
 259                 }
 260
 261                 // Set all three flags that are supported by API >= 19.
 262                 if (Build.VERSION.SDK_INT >= 19) {
 263                     view.setSystemUiVisibility(View.SYSTEM_UI_FLAG_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_FULLSCREEN | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
 264                 }
 265             }
 266
 267             // Exit full screen video
 268             public void onHideCustomView() {
 269                 if (appBar != null) {
 270                     appBar.show();
 271                 }
 272
 273                 // Show the mainWebView.
 274                 mainWebView.setVisibility(View.VISIBLE);
 275
 276                 // Show the ad if this is the free flavor.
 277                 BannerAd.showAd(adView);
 278
 279                 // Hide the fullScreenVideoFrameLayout.
 280                 fullScreenVideoFrameLayout.removeAllViews();
 281                 fullScreenVideoFrameLayout.setVisibility(View.GONE);
 282             }
 283         });
 284
 285         // Allow the downloading of files.
 286         mainWebView.setDownloadListener(new DownloadListener() {
 287             // Launch the Android download manager when a link leads to a download.
 288             @Override
 289             public void onDownloadStart(String url, String userAgent, String contentDisposition, String mimetype, long contentLength) {
 290                 DownloadManager downloadManager = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
 291                 DownloadManager.Request requestUri = new DownloadManager.Request(Uri.parse(url));
 292
 293                 // Add the URL as the description for the download.
 294                 requestUri.setDescription(url);
 295
 296                 // Show the download notification after the download is completed.
 297                 requestUri.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
 298
 299                 // Initiate the download and display a Snackbar.
 300                 downloadManager.enqueue(requestUri);
 301                 Snackbar.make(findViewById(R.id.mainWebView), R.string.download_started, Snackbar.LENGTH_SHORT).show();
 302             }
 303         });
 304
 305         // Allow pinch to zoom.
 306         mainWebView.getSettings().setBuiltInZoomControls(true);
 307
 308         // Hide zoom controls.
 309         mainWebView.getSettings().setDisplayZoomControls(false);
 310
 311         // Initialize the default preference values the first time the program is run.
 312         PreferenceManager.setDefaultValues(this, R.xml.preferences, false);
 313
 314         // Get the shared preference values.
 315         SharedPreferences savedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
 316
 317         // Set JavaScript initial status.
 318         javaScriptEnabled = savedPreferences.getBoolean("javascript_enabled", false);
 319         mainWebView.getSettings().setJavaScriptEnabled(javaScriptEnabled);
 320
 321         // Initialize cookieManager.
 322         cookieManager = CookieManager.getInstance();
 323
 324         // Set cookies initial status.
 325         firstPartyCookiesEnabled = savedPreferences.getBoolean("first_party_cookies_enabled", false);
 326         cookieManager.setAcceptCookie(firstPartyCookiesEnabled);
 327
 328         // Set third-party cookies initial status if API >= 21.
 329         if (Build.VERSION.SDK_INT >= 21) {
 330             thirdPartyCookiesEnabled = savedPreferences.getBoolean("third_party_cookies_enabled", false);
 331             cookieManager.setAcceptThirdPartyCookies(mainWebView, thirdPartyCookiesEnabled);
 332         }
 333
 334         // Set DOM storage initial status.
 335         domStorageEnabled = savedPreferences.getBoolean("dom_storage_enabled", false);
 336         mainWebView.getSettings().setDomStorageEnabled(domStorageEnabled);
 337
 338         // Set homepage initial status.
 339         homepage = savedPreferences.getString("homepage", "https://www.duckduckgo.com");
 340
 341         // Get the intent information that started the app.
 342         final Intent intent = getIntent();
 343
 344         if (intent.getData() != null) {
 345             // Get the intent data and convert it to a string.
 346             final Uri intentUriData = intent.getData();
 347             formattedUrlString = intentUriData.toString();
 348         }
 349
 350         // If formattedUrlString is null assign the homepage to it.
 351         if (formattedUrlString == null) {
 352             formattedUrlString = homepage;
 353         }
 354
 355         // Load the initial website.
 356         mainWebView.loadUrl(formattedUrlString);
 357
 358         // Load the ad if this is the free flavor.
 359         BannerAd.requestAd(adView);
 360     }
 361
 362     @Override
 363     protected void onNewIntent(Intent intent) {
 364         // Sets the new intent as the activity intent, so that any future getIntent()s pick up this one instead of creating a new activity.
 365         setIntent(intent);
 366
 367         if (intent.getData() != null) {
 368             // Get the intent data and convert it to a string.
 369             final Uri intentUriData = intent.getData();
 370             formattedUrlString = intentUriData.toString();
 371         }
 372
 373         // Close the navigation drawer if it is open.
 374         if (drawerLayout.isDrawerVisible(GravityCompat.START)) {
 375             drawerLayout.closeDrawer(GravityCompat.START);
 376         }
 377
 378         // Load the website.
 379         mainWebView.loadUrl(formattedUrlString);
 380
 381         // Clear the keyboard if displayed and remove the focus on the urlTextBar if it has it.
 382         mainWebView.requestFocus();
 383     }
 384
 385     @Override
 386     public boolean onCreateOptionsMenu(Menu menu) {
 387         // Inflate the menu; this adds items to the action bar if it is present.
 388         getMenuInflater().inflate(R.menu.menu_options, menu);
 389
 390         // Set mainMenu so it can be used by onOptionsItemSelected.
 391         mainMenu = menu;
 392
 393         // Get MenuItems for checkable menu items.
 394         MenuItem toggleJavaScript = menu.findItem(R.id.toggleJavaScript);
 395         MenuItem toggleFirstPartyCookies = menu.findItem(R.id.toggleFirstPartyCookies);
 396         MenuItem toggleThirdPartyCookies = menu.findItem(R.id.toggleThirdPartyCookies);
 397         MenuItem toggleDomStorage = menu.findItem(R.id.toggleDomStorage);
 398         /* toggleSaveFormData does nothing until database storage is implemented.
 399         MenuItem toggleSaveFormData = menu.findItem(R.id.toggleSaveFormData);
 400         */
 401
 402         // Set the initial icon for toggleJavaScript
 403         if (javaScriptEnabled) {
 404             toggleJavaScript.setIcon(R.drawable.javascript_enabled);
 405         } else {
 406             if (domStorageEnabled || firstPartyCookiesEnabled) {
 407                 toggleJavaScript.setIcon(R.drawable.warning);
 408             } else {
 409                 toggleJavaScript.setIcon(R.drawable.privacy_mode);
 410             }
 411         }
 412
 413         // Set the initial status of the menu item checkboxes.
 414         toggleFirstPartyCookies.setChecked(firstPartyCookiesEnabled);
 415         toggleThirdPartyCookies.setChecked(thirdPartyCookiesEnabled);
 416         toggleDomStorage.setChecked(domStorageEnabled);
 417         /* toggleSaveFormData does nothing until database storage is implemented.
 418         toggleSaveFormData.setChecked(saveFormDataEnabled);
 419         */
 420
 421         return true;
 422     }
 423
 424     @Override
 425     public boolean onPrepareOptionsMenu(Menu menu) {
 426         // Only enable Third-Party Cookies if SDK >= 21 and First-Party Cookies are enabled.
 427         MenuItem toggleThirdPartyCookies = menu.findItem(R.id.toggleThirdPartyCookies);
 428         if ((Build.VERSION.SDK_INT >= 21) && firstPartyCookiesEnabled) {
 429             toggleThirdPartyCookies.setEnabled(true);
 430         } else {
 431             toggleThirdPartyCookies.setEnabled(false);
 432         }
 433
 434         // Enable Clear Cookies if there are any.
 435         MenuItem clearCookies = menu.findItem(R.id.clearCookies);
 436         clearCookies.setEnabled(cookieManager.hasCookies());
 437
 438         // Run all the other default commands.
 439         super.onPrepareOptionsMenu(menu);
 440
 441         // return true displays the menu.
 442         return true;
 443     }
 444
 445     @Override
 446     // Remove Android Studio's warning about the dangers of using SetJavaScriptEnabled.
 447     @SuppressLint("SetJavaScriptEnabled")
 448     // removeAllCookies is deprecated, but it is required for API < 21.
 449     @SuppressWarnings("deprecation")
 450     public boolean onOptionsItemSelected(MenuItem menuItem) {
 451         int menuItemId = menuItem.getItemId();
 452
 453         // Some options need to update the drawable for toggleJavaScript.
 454         MenuItem toggleJavaScript = mainMenu.findItem(R.id.toggleJavaScript);
 455
 456         // Set the commands that relate to the menu entries.
 457         switch (menuItemId) {
 458             case R.id.toggleJavaScript:
 459                 if (javaScriptEnabled) {
 460                     javaScriptEnabled = false;
 461                     mainWebView.getSettings().setJavaScriptEnabled(false);
 462                     mainWebView.reload();
 463
 464                     // Update the toggleJavaScript icon and display a snackbar.
 465                     if (domStorageEnabled || firstPartyCookiesEnabled) {
 466                         menuItem.setIcon(R.drawable.warning);
 467                         Snackbar.make(findViewById(R.id.mainWebView), R.string.javascript_disabled, Snackbar.LENGTH_SHORT).show();
 468                     } else {
 469                         menuItem.setIcon(R.drawable.privacy_mode);
 470                         Snackbar.make(findViewById(R.id.mainWebView), R.string.privacy_mode, Snackbar.LENGTH_SHORT).show();
 471                     }
 472                 } else {
 473                     javaScriptEnabled = true;
 474                     menuItem.setIcon(R.drawable.javascript_enabled);
 475                     mainWebView.getSettings().setJavaScriptEnabled(true);
 476                     mainWebView.reload();
 477                     Snackbar.make(findViewById(R.id.mainWebView), R.string.javascript_enabled, Snackbar.LENGTH_SHORT).show();
 478                 }
 479                 return true;
 480
 481             case R.id.toggleFirstPartyCookies:
 482                 if (firstPartyCookiesEnabled) {
 483                     firstPartyCookiesEnabled = false;
 484                     menuItem.setChecked(false);
 485                     cookieManager.setAcceptCookie(false);
 486                     mainWebView.reload();
 487
 488                     // Update the toggleJavaScript icon if appropriate and display a snackbar.
 489                     if (!javaScriptEnabled) {
 490                         if (domStorageEnabled) {
 491                             toggleJavaScript.setIcon(R.drawable.warning);
 492                             Snackbar.make(findViewById(R.id.mainWebView), R.string.first_party_cookies_disabled, Snackbar.LENGTH_SHORT).show();
 493                         } else {
 494                             toggleJavaScript.setIcon(R.drawable.privacy_mode);
 495                             Snackbar.make(findViewById(R.id.mainWebView), R.string.privacy_mode, Snackbar.LENGTH_SHORT).show();
 496                         }
 497                     } else {
 498                         Snackbar.make(findViewById(R.id.mainWebView), R.string.first_party_cookies_disabled, Snackbar.LENGTH_SHORT).show();
 499                     }
 500                 } else {
 501                     firstPartyCookiesEnabled = true;
 502                     menuItem.setChecked(true);
 503                     cookieManager.setAcceptCookie(true);
 504                     mainWebView.reload();
 505
 506                     // Update the toggleJavaScript icon if appropriate.
 507                     if (!javaScriptEnabled) {
 508                         toggleJavaScript.setIcon(R.drawable.warning);
 509                     } // Else do nothing because JavaScript is enabled.
 510
 511                     Snackbar.make(findViewById(R.id.mainWebView), R.string.first_party_cookies_enabled, Snackbar.LENGTH_SHORT).show();
 512                 }
 513                 return true;
 514
 515             case R.id.toggleThirdPartyCookies:
 516                 if (Build.VERSION.SDK_INT >= 21) {
 517                     if (thirdPartyCookiesEnabled) {
 518                         thirdPartyCookiesEnabled = false;
 519                         menuItem.setChecked(false);
 520                         cookieManager.setAcceptThirdPartyCookies(mainWebView, false);
 521                         mainWebView.reload();
 522
 523                         Snackbar.make(findViewById(R.id.mainWebView), R.string.third_party_cookies_disabled, Snackbar.LENGTH_SHORT).show();
 524                     } else {
 525                         thirdPartyCookiesEnabled = true;
 526                         menuItem.setChecked(true);
 527                         cookieManager.setAcceptThirdPartyCookies(mainWebView, true);
 528                         mainWebView.reload();
 529
 530                         Snackbar.make(findViewById(R.id.mainWebView), R.string.third_party_cookies_enabled, Snackbar.LENGTH_SHORT).show();
 531                     }
 532                 } // Else do nothing because SDK < 21.
 533                 return true;
 534
 535             case R.id.toggleDomStorage:
 536                 if (domStorageEnabled) {
 537                     domStorageEnabled = false;
 538                     menuItem.setChecked(false);
 539                     mainWebView.getSettings().setDomStorageEnabled(false);
 540                     mainWebView.reload();
 541
 542                     // Update the toggleJavaScript icon if appropriate and display a snackbar.
 543                     if (!javaScriptEnabled) {
 544                         if (firstPartyCookiesEnabled) {
 545                             toggleJavaScript.setIcon(R.drawable.warning);
 546                             Snackbar.make(findViewById(R.id.mainWebView), R.string.dom_storage_disabled, Snackbar.LENGTH_SHORT).show();
 547                         } else {
 548                             toggleJavaScript.setIcon(R.drawable.privacy_mode);
 549                             Snackbar.make(findViewById(R.id.mainWebView), R.string.privacy_mode, Snackbar.LENGTH_SHORT).show();
 550                         }
 551                     }else {
 552                         Snackbar.make(findViewById(R.id.mainWebView), R.string.dom_storage_disabled, Snackbar.LENGTH_SHORT).show();
 553                     }
 554                 } else {
 555                     domStorageEnabled = true;
 556                     menuItem.setChecked(true);
 557                     mainWebView.getSettings().setDomStorageEnabled(true);
 558                     mainWebView.reload();
 559
 560                     // Update the toggleJavaScript icon if appropriate.
 561                     if (!javaScriptEnabled) {
 562                         toggleJavaScript.setIcon(R.drawable.warning);
 563                     } // Else Do nothing because JavaScript is enabled.
 564
 565                     Snackbar.make(findViewById(R.id.mainWebView), R.string.dom_storage_enabled, Snackbar.LENGTH_SHORT).show();
 566                 }
 567                 return true;
 568
 569             case R.id.clearCookies:
 570                 if (Build.VERSION.SDK_INT < 21) {
 571                     cookieManager.removeAllCookie();
 572                 } else {
 573                     cookieManager.removeAllCookies(null);
 574                 }
 575                 Snackbar.make(findViewById(R.id.mainWebView), R.string.cookies_deleted, Snackbar.LENGTH_SHORT).show();
 576                 return true;
 577
 578             case R.id.clearDomStorage:
 579                 WebStorage webStorage = WebStorage.getInstance();
 580                 webStorage.deleteAllData();
 581                 Snackbar.make(findViewById(R.id.mainWebView), R.string.dom_storage_deleted, Snackbar.LENGTH_SHORT).show();
 582                 return true;
 583
 584             case R.id.share:
 585                 Intent shareIntent = new Intent();
 586                 shareIntent.setAction(Intent.ACTION_SEND);
 587                 shareIntent.putExtra(Intent.EXTRA_TEXT, urlTextBox.getText().toString());
 588                 shareIntent.setType("text/plain");
 589                 startActivity(Intent.createChooser(shareIntent, "Share URL"));
 590                 return true;
 591
 592             case R.id.addToHomescreen:
 593                 // Show the CreateHomeScreenShortcut AlertDialog and name this instance createShortcut.
 594                 AppCompatDialogFragment shortcutDialog = new CreateHomeScreenShortcut();
 595                 shortcutDialog.show(getSupportFragmentManager(), "createShortcut");
 596
 597                 //Everything else will be handled by CreateHomeScreenShortcut and the associated listeners below.
 598                 return true;
 599
 600             default:
 601                 return super.onOptionsItemSelected(menuItem);
 602         }
 603     }
 604
 605     @Override
 606     // removeAllCookies is deprecated, but it is required for API < 21.
 607     @SuppressWarnings("deprecation")
 608     public boolean onNavigationItemSelected(MenuItem menuItem) {
 609         int menuItemId = menuItem.getItemId();
 610
 611         switch (menuItemId) {
 612             case R.id.home:
 613                 mainWebView.loadUrl(homepage);
 614                 break;
 615
 616             case R.id.back:
 617                 if (mainWebView.canGoBack()) {
 618                     mainWebView.goBack();
 619                 }
 620                 break;
 621
 622             case R.id.forward:
 623                 if (mainWebView.canGoForward()) {
 624                     mainWebView.goForward();
 625                 }
 626                 break;
 627
 628             case R.id.downloads:
 629                 // Launch the system Download Manager.
 630                 Intent downloadManagerIntent = new Intent(DownloadManager.ACTION_VIEW_DOWNLOADS);
 631
 632                 // Launch as a new task so that Download Manager and Privacy Browser show as separate windows in the recent tasks list.
 633                 downloadManagerIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
 634
 635                 startActivity(downloadManagerIntent);
 636                 break;
 637
 638             case R.id.settings:
 639                 // Launch PreferenceFragment.
 640                 Intent intent = new Intent(this, SettingsActivity.class);
 641                 startActivity(intent);
 642                 break;
 643
 644             case R.id.about:
 645                 // Show the AboutDialog AlertDialog and name this instance aboutDialog.
 646                 AppCompatDialogFragment aboutDialog = new AboutDialog();
 647                 aboutDialog.show(getSupportFragmentManager(), "aboutDialog");
 648                 break;
 649
 650             case R.id.clearAndExit:
 651                 // Clear DOM storage.
 652                 WebStorage domStorage = WebStorage.getInstance();
 653                 domStorage.deleteAllData();
 654
 655                 // Clear cookies.  The commands changed slightly in API 21.
 656                 if (Build.VERSION.SDK_INT >= 21) {
 657                     cookieManager.removeAllCookies(null);
 658                 } else {
 659                     cookieManager.removeAllCookie();
 660                 }
 661
 662                 // Destroy the internal state of the webview.
 663                 mainWebView.destroy();
 664
 665                 // Close Privacy Browser.  finishAndRemoveTask also removes Privacy Browser from the recent app list.
 666                 if (Build.VERSION.SDK_INT >= 21) {
 667                     finishAndRemoveTask();
 668                 } else {
 669                     finish();
 670                 }
 671                 break;
 672
 673             default:
 674                 break;
 675         }
 676
 677         // Close the navigation drawer.
 678         drawerLayout.closeDrawer(GravityCompat.START);
 679         return true;
 680     }
 681
 682     @Override
 683     public void onPostCreate(Bundle savedInstanceState) {
 684         super.onPostCreate(savedInstanceState);
 685
 686         // Sync the state of the DrawerToggle after onRestoreInstanceState has finished.
 687         drawerToggle.syncState();
 688     }
 689
 690     @Override
 691     public void onConfigurationChanged(Configuration newConfig) {
 692         super.onConfigurationChanged(newConfig);
 693
 694         // Update the status of the drawerToggle icon.
 695         drawerToggle.onConfigurationChanged(newConfig);
 696     }
 697
 698     @Override
 699     public void onCreateHomeScreenShortcutCancel(DialogFragment dialog) {
 700         // Do nothing because the user selected "Cancel".
 701     }
 702
 703     @Override
 704     public void onCreateHomeScreenShortcutCreate(DialogFragment dialog) {
 705         // Get shortcutNameEditText from the alert dialog.
 706         EditText shortcutNameEditText = (EditText) dialog.getDialog().findViewById(R.id.shortcutNameEditText);
 707
 708         // Create the bookmark shortcut based on formattedUrlString.
 709         Intent bookmarkShortcut = new Intent();
 710         bookmarkShortcut.setAction(Intent.ACTION_VIEW);
 711         bookmarkShortcut.setData(Uri.parse(formattedUrlString));
 712
 713         // Place the bookmark shortcut on the home screen.
 714         Intent placeBookmarkShortcut = new Intent();
 715         placeBookmarkShortcut.putExtra("android.intent.extra.shortcut.INTENT", bookmarkShortcut);
 716         placeBookmarkShortcut.putExtra("android.intent.extra.shortcut.NAME", shortcutNameEditText.getText().toString());
 717         placeBookmarkShortcut.putExtra("android.intent.extra.shortcut.ICON", favoriteIcon);
 718         placeBookmarkShortcut.setAction("com.android.launcher.action.INSTALL_SHORTCUT");
 719         sendBroadcast(placeBookmarkShortcut);
 720     }
 721
 722     // Override onBackPressed to handle the navigation drawer and mainWebView.
 723     @Override
 724     public void onBackPressed() {
 725         final WebView mainWebView = (WebView) findViewById(R.id.mainWebView);
 726
 727         // Close the navigation drawer if it is available.  GravityCompat.START is the drawer on the left on Left-to-Right layout text.
 728         if (drawerLayout.isDrawerVisible(GravityCompat.START)) {
 729             drawerLayout.closeDrawer(GravityCompat.START);
 730         } else {
 731             // Load the previous URL if available.
 732             if (mainWebView.canGoBack()) {
 733                 mainWebView.goBack();
 734             } else {
 735                 // Pass onBackPressed to the system.
 736                 super.onBackPressed();
 737             }
 738         }
 739     }
 740
 741     private void loadUrlFromTextBox() throws UnsupportedEncodingException {
 742         // Get the text from urlTextBox and convert it to a string.
 743         String unformattedUrlString = urlTextBox.getText().toString();
 744         URL unformattedUrl = null;
 745         Uri.Builder formattedUri = new Uri.Builder();
 746
 747         // Check to see if unformattedUrlString is a valid URL.  Otherwise, convert it into a Duck Duck Go search.
 748         if (Patterns.WEB_URL.matcher(unformattedUrlString).matches()) {
 749             // Add http:// at the beginning if it is missing.  Otherwise the app will segfault.
 750             if (!unformattedUrlString.startsWith("http")) {
 751                 unformattedUrlString = "http://" + unformattedUrlString;
 752             }
 753
 754             // Convert unformattedUrlString to a URL, then to a URI, and then back to a string, which sanitizes the input and adds in any missing components.
 755             try {
 756                 unformattedUrl = new URL(unformattedUrlString);
 757             } catch (MalformedURLException e) {
 758                 e.printStackTrace();
 759             }
 760
 761             // The ternary operator (? :) makes sure that a null pointer exception is not thrown, which would happen if .get was called on a null value.
 762             final String scheme = unformattedUrl != null ? unformattedUrl.getProtocol() : null;
 763             final String authority = unformattedUrl != null ? unformattedUrl.getAuthority() : null;
 764             final String path = unformattedUrl != null ? unformattedUrl.getPath() : null;
 765             final String query = unformattedUrl != null ? unformattedUrl.getQuery() : null;
 766             final String fragment = unformattedUrl != null ? unformattedUrl.getRef() : null;
 767
 768             formattedUri.scheme(scheme).authority(authority).path(path).query(query).fragment(fragment);
 769             formattedUrlString = formattedUri.build().toString();
 770         } else {
 771             // Sanitize the search input and convert it to a DuckDuckGo search.
 772             final String encodedUrlString = URLEncoder.encode(unformattedUrlString, "UTF-8");
 773
 774             // Use the correct search URL based on javaScriptEnabled.
 775             if (javaScriptEnabled) {
 776                 formattedUrlString = "https://duckduckgo.com/?q=" + encodedUrlString;
 777             } else {
 778                 formattedUrlString = "https://duckduckgo.com/html/?q=" + encodedUrlString;
 779             }
 780         }
 781
 782         mainWebView.loadUrl(formattedUrlString);
 783
 784         // Hides the keyboard so we can see the webpage.
 785         InputMethodManager inputMethodManager = (InputMethodManager) getSystemService(Activity.INPUT_METHOD_SERVICE);
 786         inputMethodManager.hideSoftInputFromWindow(mainWebView.getWindowToken(), 0);
 787     }
 788 }