RemoteWipeSetup activity and view model, wiper selector fragment

briar-android/src/main/java/org/briarproject/briar/android/activity/ActivityComponent.java

@@ -65,6 +65,8 @@ import org.briarproject.briar.android.privategroup.memberlist.GroupMemberModule;
 import org.briarproject.briar.android.privategroup.reveal.GroupRevealModule;
 import org.briarproject.briar.android.privategroup.reveal.RevealContactsActivity;
 import org.briarproject.briar.android.privategroup.reveal.RevealContactsFragment;
+import org.briarproject.briar.android.remotewipe.RemoteWipeSetupActivity;
+import org.briarproject.briar.android.remotewipe.WiperSelectorFragment;
 import org.briarproject.briar.android.reporting.CrashFragment;
 import org.briarproject.briar.android.reporting.CrashReportActivity;
 import org.briarproject.briar.android.reporting.ReportFormFragment;
@@ -215,6 +217,8 @@ public interface ActivityComponent {
 
     void inject(RestoreAccountActivity restoreAccountActivity);
 
+    void inject(RemoteWipeSetupActivity remoteWipeSetupActivity);
+
 	// Fragments
 
 	void inject(AuthorNameFragment fragment);
@@ -306,4 +310,6 @@ public interface ActivityComponent {
 	void inject(OwnerRecoveryModeErrorFragment ownerRecoveryModeErrorFragment);
 
 	void inject(CustodianReturnShardErrorFragment custodianReturnShardErrorFragment);
+
+	void inject(WiperSelectorFragment wiperSelectorFragment);
 }

briar-android/src/main/java/org/briarproject/briar/android/remotewipe/RemoteWipeSetupActivity.java

@@ -0,0 +1,60 @@
+package org.briarproject.briar.android.remotewipe;
+
+import android.os.Bundle;
+import android.widget.Toast;
+
+import org.briarproject.bramble.api.contact.ContactId;
+import org.briarproject.briar.R;
+import org.briarproject.briar.android.activity.ActivityComponent;
+import org.briarproject.briar.android.activity.BriarActivity;
+import org.briarproject.briar.android.contactselection.ContactSelectorListener;
+import org.briarproject.briar.android.fragment.BaseFragment;
+import org.briarproject.briar.android.socialbackup.ThresholdSelectorFragment;
+
+import java.util.Collection;
+
+import javax.inject.Inject;
+
+import androidx.lifecycle.ViewModelProvider;
+
+public class RemoteWipeSetupActivity extends BriarActivity implements
+		BaseFragment.BaseFragmentListener, ContactSelectorListener {
+
+	@Inject
+	ViewModelProvider.Factory viewModelFactory;
+	RemoteWipeSetupViewModel viewModel;
+
+	@Override
+	public void injectActivity(ActivityComponent component) {
+		component.inject(this);
+
+		viewModel = new ViewModelProvider(this, viewModelFactory)
+				.get(RemoteWipeSetupViewModel.class);
+
+//		viewModel.getState().observeEvent(this, this::onStateChanged);
+	}
+
+	@Override
+	public void onCreate(Bundle savedInstanceState) {
+		super.onCreate(savedInstanceState);
+		setContentView(R.layout.activity_distributed_backup);
+        if (viewModel.remoteWipeIsSetup()) {
+//        	showInitialFragment();
+        } else {
+	        showInitialFragment(WiperSelectorFragment.newInstance());
+        }
+	}
+
+	@Override
+	public void contactsSelected(Collection<ContactId> contacts) {
+		Toast.makeText(this,
+				String.format("Selected %d contacts", contacts.size()),
+				Toast.LENGTH_SHORT).show();
+		try {
+			viewModel.setupRemoteWipe(contacts);
+		} catch (Exception e) {
+			// Display error fragment
+		}
+	}
+
+}

briar-android/src/main/java/org/briarproject/briar/android/remotewipe/RemoteWipeSetupViewModel.java

@@ -0,0 +1,50 @@
+package org.briarproject.briar.android.remotewipe;
+
+import android.app.Application;
+import android.provider.ContactsContract;
+
+import org.briarproject.bramble.api.FormatException;
+import org.briarproject.bramble.api.contact.ContactId;
+import org.briarproject.bramble.api.db.DatabaseComponent;
+import org.briarproject.bramble.api.db.DbException;
+import org.briarproject.briar.api.remotewipe.RemoteWipeManager;
+
+import java.util.Collection;
+import java.util.List;
+
+import javax.inject.Inject;
+
+import androidx.annotation.NonNull;
+import androidx.lifecycle.AndroidViewModel;
+
+public class RemoteWipeSetupViewModel extends AndroidViewModel {
+	private final RemoteWipeManager remoteWipeManager;
+	private final DatabaseComponent db;
+
+	@Inject
+	RemoteWipeSetupViewModel(
+			@NonNull Application application,
+			RemoteWipeManager remoteWipeManager,
+			DatabaseComponent db) {
+		super(application);
+		this.remoteWipeManager = remoteWipeManager;
+		this.db = db;
+	}
+
+	public boolean remoteWipeIsSetup() {
+		try {
+			return db.transactionWithResult(true,
+					txn -> remoteWipeManager.remoteWipeIsSetup(txn));
+		} catch (DbException e) {
+			return false;
+		}
+	}
+
+	public void setupRemoteWipe(Collection<ContactId> wipers)
+			throws DbException, FormatException {
+		db.transaction(false, txn -> {
+			remoteWipeManager.setup(txn, (List<ContactId>) wipers);
+		});
+	}
+}
+

briar-android/src/main/java/org/briarproject/briar/android/remotewipe/WiperSelectorFragment.java

@@ -0,0 +1,86 @@
+package org.briarproject.briar.android.remotewipe;
+
+import android.os.Bundle;
+import android.view.MenuItem;
+import android.widget.Toast;
+
+import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
+import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
+import org.briarproject.briar.R;
+import org.briarproject.briar.android.activity.ActivityComponent;
+import org.briarproject.briar.android.contactselection.BaseContactSelectorAdapter;
+import org.briarproject.briar.android.contactselection.ContactSelectorController;
+import org.briarproject.briar.android.contactselection.ContactSelectorFragment;
+import org.briarproject.briar.android.contactselection.SelectableContactItem;
+import org.briarproject.briar.android.socialbackup.creation.CreateBackupController;
+
+import javax.inject.Inject;
+
+import androidx.annotation.Nullable;
+
+@MethodsNotNullByDefault
+@ParametersNotNullByDefault
+public class WiperSelectorFragment extends ContactSelectorFragment {
+
+	public static final String TAG = WiperSelectorFragment.class.getName();
+
+	@Inject
+	CreateBackupController controller;
+
+	public static WiperSelectorFragment newInstance() {
+		Bundle args = new Bundle();
+
+		WiperSelectorFragment
+				fragment = new WiperSelectorFragment();
+		fragment.setArguments(args);
+
+		return fragment;
+	}
+
+	@Override
+	public void injectFragment(ActivityComponent component) {
+		component.inject(this);
+	}
+
+	@Override
+	public void onCreate(@Nullable Bundle savedInstanceState) {
+		super.onCreate(savedInstanceState);
+
+		requireActivity().setTitle(R.string.title_select_wipers);
+	}
+
+	@Override
+	protected ContactSelectorController<SelectableContactItem> getController() {
+		return controller;
+	}
+
+	@Override
+	public String getUniqueTag() {
+		return TAG;
+	}
+
+	@Override
+	protected void onSelectionChanged() {
+		super.onSelectionChanged();
+		if (menu == null) return;
+		MenuItem item = menu.findItem(R.id.action_contacts_selected);
+		if (item == null) return;
+
+		BaseContactSelectorAdapter a = adapter;
+		selectedContacts = a.getSelectedContactIds();
+
+		int n = selectedContacts.size();
+		int min = 2;
+		boolean enough = n >= min;
+
+		item.setVisible(enough);
+		if (n == 0) {
+			Toast.makeText(getContext(), String.format(getString(R.string.select_at_least_n_contacts), min),
+					Toast.LENGTH_SHORT).show();
+		} else if (n < min) {
+			Toast.makeText(getContext(), String.format(getString(R.string.select_at_least_n_more_contacts), min - n),
+					Toast.LENGTH_SHORT).show();
+		}
+	}
+
+}

briar-android/src/main/res/values/strings.xml

@@ -732,6 +732,9 @@
 
 	<!-- Remote Wipe -->
 
+	<!-- titles for the app bar -->
+	<string name="title_select_wipers">Select Trusted Contacts</string>
+
 	<!-- conversation -->
 	<string name="remote_wipe_setup_received">You have been added a remote wiper.</string>
 	<string name="remote_wipe_setup_sent">You have added this contact as a remote wiper.</string>