Add support for guardian project panic/ripple app

app/src/main/AndroidManifest.xml

@@ -105,6 +105,11 @@
                 <data android:scheme="http"/>
                 <data android:scheme="https"/>
             </intent-filter>
+            <intent-filter>
+                <action android:name="info.guardianproject.panic.action.TRIGGER"/>
+
+                <category android:name="android.intent.category.DEFAULT"/>
+            </intent-filter>
         </activity>
         <activity
             android:name=".activity.SettingsActivity"

app/src/main/java/acr/browser/lightning/activity/BrowserActivity.java

@@ -125,6 +125,8 @@ import butterknife.ButterKnife;
 
 public abstract class BrowserActivity extends ThemableBrowserActivity implements BrowserView, UIController, OnClickListener, OnLongClickListener {
 
+    private static final String INTENT_PANIC_TRIGGER = "info.guardianproject.panic.action.TRIGGER";
+
     // Static Layout
     @Bind(R.id.drawer_layout)
     DrawerLayout mDrawerLayout;
@@ -171,12 +173,13 @@ public abstract class BrowserActivity extends ThemableBrowserActivity implements
     // Primatives
     private boolean mFullScreen;
     private boolean mDarkTheme;
-    private boolean mIsNewIntent = false;
     private boolean mIsFullScreen = false;
     private boolean mIsImmersive = false;
     private boolean mShowTabsInDrawer;
-    private int mOriginalOrientation, mBackgroundColor, mIdGenerator, mIconColor,
+    private int mOriginalOrientation;
-            mCurrentUiColor = Color.BLACK;
+    private int mBackgroundColor;
+    private int mIconColor;
+    private int mCurrentUiColor = Color.BLACK;
     private String mSearchText;
     private String mUntitledTitle;
     private String mCameraPhotoPath;
@@ -356,9 +359,30 @@ public abstract class BrowserActivity extends ThemableBrowserActivity implements
             WebIconDatabase.getInstance().open(getDir("icons", MODE_PRIVATE).getPath());
         }
 
+        if (isPanicTrigger(getIntent())) {
+            panicClean();
+        } else {
             mPresenter.setupTabs(getIntent(), isIncognito());
             mProxyUtils.checkForProxy(BrowserActivity.this);
         }
+    }
+
+    boolean isPanicTrigger(Intent intent) {
+        return intent != null && INTENT_PANIC_TRIGGER.equals(intent.getAction());
+    }
+
+    void panicClean() {
+        Log.d(Constants.TAG, "Closing browser");
+        mTabsManager.newTab(this, "", false);
+        mTabsManager.switchToTab(0);
+        mTabsManager.clearSavedState();
+        HistoryPage.deleteHistoryPage(getApplication());
+        closeBrowser();
+        // System exit needed in the case of receiving
+        // the panic intent since finish() isn't completely
+        // closing the browser
+        System.exit(1);
+    }
 
     private class SearchListenerClass implements OnKeyListener, OnEditorActionListener, OnFocusChangeListener, OnTouchListener {
 
@@ -806,8 +830,6 @@ public abstract class BrowserActivity extends ThemableBrowserActivity implements
         // Set the background color so the color mode color doesn't show through
         mBrowserFrame.setBackgroundColor(mBackgroundColor);
 
-        mIsNewIntent = false;
-
         mBrowserFrame.removeAllViews();
 
         removeViewFromParent(mCurrentView);
@@ -842,8 +864,6 @@ public abstract class BrowserActivity extends ThemableBrowserActivity implements
         // Set the background color so the color mode color doesn't show through
         mBrowserFrame.setBackgroundColor(mBackgroundColor);
 
-        mIsNewIntent = false;
-
         final float translation = mToolbarLayout.getTranslationY();
         mBrowserFrame.removeAllViews();
 

app/src/main/java/acr/browser/lightning/activity/MainActivity.java

@@ -39,9 +39,13 @@ public class MainActivity extends BrowserActivity {
 
     @Override
     protected void onNewIntent(Intent intent) {
+        if (isPanicTrigger(intent)) {
+            panicClean();
+        } else {
             handleNewIntent(intent);
             super.onNewIntent(intent);
         }
+    }
 
     @Override
     protected void onPause() {

app/src/main/java/acr/browser/lightning/activity/TabsManager.java

@@ -341,6 +341,15 @@ public class TabsManager {
         FileUtils.writeBundleToStorage(mApp, outState, BUNDLE_STORAGE);
     }
 
+    /**
+     * Use this method to clear the saved
+     * state if you do not wish it to be
+     * restored when the browser next starts.
+     */
+    public void clearSavedState() {
+        FileUtils.deleteBundleInStorage(mApp, BUNDLE_STORAGE);
+    }
+
     /**
      * Restores the previously saved tabs from the
      * bundle stored in peristent file storage.

app/src/main/java/acr/browser/lightning/constant/HistoryPage.java

@@ -106,4 +106,18 @@ public class HistoryPage extends AsyncTask<Void, Void, Void> {
         executeOnExecutor(BrowserApp.getIOThread());
     }
 
+    /**
+     * Use this method to immediately delete the history
+     * page on the current thread. This will clear the
+     * cached history page that was stored on file.
+     *
+     * @param application the application object needed to get the file.
+     */
+    public static void deleteHistoryPage(@NonNull Application application) {
+        File historyWebPage = new File(application.getFilesDir(), FILENAME);
+        if (historyWebPage.exists()) {
+            historyWebPage.delete();
+        }
+    }
+
 }

app/src/main/java/acr/browser/lightning/utils/FileUtils.java

@@ -54,6 +54,21 @@ public class FileUtils {
         });
     }
 
+    /**
+     * Use this method to delete the bundle with the specified name.
+     * This is a blocking call and should be used within a worker
+     * thread unless immediate deletion is necessary.
+     *
+     * @param app  the application object needed to get the file.
+     * @param name the name of the file.
+     */
+    public static void deleteBundleInStorage(final @NonNull Application app, final @NonNull String name) {
+        File outputFile = new File(app.getFilesDir(), name);
+        if (outputFile.exists()) {
+            outputFile.delete();
+        }
+    }
+
     /**
      * Reads a bundle from the file with the specified
      * name in the peristent storage files directory.