Add logout action

app/src/main/java/fr/free/nrw/commons/CommonsApplication.java

@@ -5,9 +5,13 @@ import android.accounts.AccountManager;
 import android.accounts.AuthenticatorException;
 import android.accounts.OperationCanceledException;
 import android.app.Application;
+import android.content.Context;
+import android.content.SharedPreferences;
 import android.content.pm.PackageManager;
+import android.database.sqlite.SQLiteDatabase;
 import android.graphics.Bitmap;
 import android.os.Build;
+import android.preference.PreferenceManager;
 import android.support.v4.util.LruCache;
 
 import com.android.volley.RequestQueue;
@@ -35,9 +39,14 @@ import org.apache.http.impl.conn.tsccm.ThreadSafeClientConnManager;
 import org.apache.http.params.BasicHttpParams;
 import org.apache.http.params.CoreProtocolPNames;
 
+import java.io.File;
 import java.io.IOException;
 
 import fr.free.nrw.commons.caching.CacheController;
+import fr.free.nrw.commons.category.Category;
+import fr.free.nrw.commons.contributions.Contribution;
+import fr.free.nrw.commons.data.DBOpenHelper;
+import fr.free.nrw.commons.modifications.ModifierSequence;
 import timber.log.Timber;
 
 // TODO: Use ProGuard to rip out reporting when publishing
@@ -217,4 +226,59 @@ public class CommonsApplication extends Application {
         return pm.hasSystemFeature(PackageManager.FEATURE_CAMERA) ||
                 pm.hasSystemFeature(PackageManager.FEATURE_CAMERA_FRONT);
     }
+
+    public void clearApplicationData(Context context) {
+        File cacheDirectory = context.getCacheDir();
+        File applicationDirectory = new File(cacheDirectory.getParent());
+        if (applicationDirectory.exists()) {
+            String[] fileNames = applicationDirectory.list();
+            for (String fileName : fileNames) {
+                if (!fileName.equals("lib")) {
+                    deleteFile(new File(applicationDirectory, fileName));
+                }
+            }
+        }
+
+        AccountManager accountManager = AccountManager.get(this);
+        Account[] allAccounts = accountManager.getAccountsByType(AccountUtil.accountType());
+        for (int index = 0; index < allAccounts.length; index++) {
+            accountManager.removeAccount(allAccounts[index], null, null);
+        }
+
+        //TODO: fix preference manager 
+        PreferenceManager.getDefaultSharedPreferences(app).edit().clear().commit();
+        SharedPreferences preferences = context.getSharedPreferences("fr.free.nrw.commons", MODE_PRIVATE);
+        preferences.edit().clear().commit();
+        context.getSharedPreferences("prefs", Context.MODE_PRIVATE).edit().clear().commit();;
+        preferences.edit().putBoolean("firstrun", false).apply();
+        updateAllDatabases(context);
+        currentAccount = null;
+    }
+
+    public void updateAllDatabases(Context context)
+    {
+        DBOpenHelper dbOpenHelper = DBOpenHelper.getInstance(context);
+        dbOpenHelper.getReadableDatabase().close();
+        SQLiteDatabase db = dbOpenHelper.getWritableDatabase();
+
+        ModifierSequence.Table.onDelete(db);
+        Category.Table.onDelete(db);
+        Contribution.Table.onDelete(db);
+    }
+
+    public static boolean deleteFile(File file) {
+        boolean deletedAll = true;
+        if (file != null) {
+            if (file.isDirectory()) {
+                String[] children = file.list();
+                for (int i = 0; i < children.length; i++) {
+                    deletedAll = deleteFile(new File(file, children[i])) && deletedAll;
+                }
+            } else {
+                deletedAll = file.delete();
+            }
+        }
+
+        return deletedAll;
+    }
 }

app/src/main/java/fr/free/nrw/commons/hamburger/NavigationBaseFragment.java

@@ -1,11 +1,13 @@
 package fr.free.nrw.commons.hamburger;
 
 import android.content.ActivityNotFoundException;
+import android.content.DialogInterface;
 import android.content.Intent;
 import android.os.Bundle;
 import android.support.v4.app.Fragment;
 import android.support.v4.widget.DrawerLayout;
 import android.support.v7.app.ActionBarDrawerToggle;
+import android.support.v7.app.AlertDialog;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -21,6 +23,7 @@ import fr.free.nrw.commons.AboutActivity;
 import fr.free.nrw.commons.BuildConfig;
 import fr.free.nrw.commons.CommonsApplication;
 import fr.free.nrw.commons.R;
+import fr.free.nrw.commons.auth.LoginActivity;
 import fr.free.nrw.commons.contributions.ContributionsActivity;
 import fr.free.nrw.commons.nearby.NearbyActivity;
 import fr.free.nrw.commons.settings.SettingsActivity;
@@ -120,6 +123,32 @@ public class NavigationBaseFragment extends Fragment {
         }
     }
 
+    @OnClick(R.id.logout_item)
+    protected void onLogoutItemClicked() {
+        AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(getActivity());
+        alertDialogBuilder.setMessage(R.string.logout_verification)
+                .setCancelable(false)
+                .setPositiveButton(R.string.yes,
+                        new DialogInterface.OnClickListener() {
+                            public void onClick(DialogInterface dialog, int id) {
+                                ((CommonsApplication)getActivity().getApplicationContext()).clearApplicationData(getContext());
+                                Intent nearbyIntent = new Intent(getActivity(), LoginActivity.class);
+                                nearbyIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
+                                nearbyIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+                                startActivity(nearbyIntent);
+                                getActivity().finish();
+                            }
+                        });
+        alertDialogBuilder.setNegativeButton(R.string.no,
+                new DialogInterface.OnClickListener() {
+                    public void onClick(DialogInterface dialog, int id) {
+                        dialog.cancel();
+                    }
+                });
+        AlertDialog alert = alertDialogBuilder.create();
+        alert.show();
+    }
+
     private void closeDrawer() {
         if (drawerLayout != null) {
             drawerLayout.closeDrawer(drawerPane);

app/src/main/res/values/strings.xml

@@ -183,6 +183,7 @@ Tap this message (or hit back) to skip this step.</string>
   <string name="maximum_limit_alert">Unable to display more than 500</string>
   <string name="set_limit">Set Recent Upload Limit</string>
   <string name="login_failed_2fa_not_supported">Two factor authentication is currently not supported.</string>
+  <string name="logout_verification">Do you really want to logout?</string>
 
   <string name="cancel">Cancel</string>
   <string name="navigation_drawer_open">Open</string>