Change Tor settings after asking for confirmation.

bramble-core/src/main/java/org/briarproject/bramble/plugin/tor/CircumventionProvider.java

@@ -17,7 +17,7 @@ public interface CircumventionProvider {
 	String[] BLOCKED = {"CN", "IR", "EG", "BY", "TR", "SY", "VE"};
 
 	/**
-	 * Countries where obfs4 bridge connection are likely to work.
+	 * Countries where obfs4 or meek bridge connections are likely to work.
 	 * Should be a subset of {@link #BLOCKED}.
 	 */
 	String[] BRIDGES = { "CN", "IR", "EG", "BY", "TR", "SY", "VE" };

briar-android/src/main/java/org/briarproject/briar/android/navdrawer/NavDrawerActivity.java

@@ -17,6 +17,7 @@ import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.lifecycle.LifecycleManager;
 import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
 import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
+import org.briarproject.bramble.api.system.LocationUtils;
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.activity.ActivityComponent;
 import org.briarproject.briar.android.activity.BriarActivity;
@@ -37,6 +38,7 @@ import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.appcompat.app.ActionBar;
 import androidx.appcompat.app.ActionBarDrawerToggle;
+import androidx.appcompat.app.AlertDialog;
 import androidx.appcompat.widget.Toolbar;
 import androidx.core.app.ActivityCompat;
 import androidx.drawerlayout.widget.DrawerLayout;
@@ -53,9 +55,13 @@ import static androidx.fragment.app.FragmentManager.POP_BACK_STACK_INCLUSIVE;
 import static java.util.Objects.requireNonNull;
 import static java.util.logging.Logger.getLogger;
 import static org.briarproject.bramble.api.lifecycle.LifecycleManager.LifecycleState.RUNNING;
+import static org.briarproject.bramble.api.plugin.TorConstants.REASON_BATTERY;
+import static org.briarproject.bramble.api.plugin.TorConstants.REASON_COUNTRY_BLOCKED;
+import static org.briarproject.bramble.api.plugin.TorConstants.REASON_MOBILE_DATA;
 import static org.briarproject.briar.android.BriarService.EXTRA_STARTUP_FAILED;
 import static org.briarproject.briar.android.activity.RequestCodes.REQUEST_PASSWORD;
 import static org.briarproject.briar.android.navdrawer.IntentRouter.handleExternalIntent;
+import static org.briarproject.briar.android.util.UiUtils.getCountryDisplayName;
 import static org.briarproject.briar.android.util.UiUtils.getDaysUntilExpiry;
 
 @MethodsNotNullByDefault
@@ -84,9 +90,13 @@ public class NavDrawerActivity extends BriarActivity implements
 
 	@Inject
 	ViewModelProvider.Factory viewModelFactory;
+
 	@Inject
 	LifecycleManager lifecycleManager;
 
+	@Inject
+	LocationUtils locationUtils;
+
 	private DrawerLayout drawerLayout;
 	private NavigationView navigation;
 
@@ -110,7 +120,10 @@ public class NavDrawerActivity extends BriarActivity implements
 		});
 
 		View drawerScrollView = findViewById(R.id.drawerScrollView);
-		new PluginViewController(drawerScrollView, this, viewModel);
+		PluginViewController pluginViewController =
+				new PluginViewController(drawerScrollView, this, viewModel);
+		pluginViewController.getReasonsTorDisabled().observeEvent(this,
+				this::showTorSettingsDialog);
 
 		Toolbar toolbar = findViewById(R.id.toolbar);
 		drawerLayout = findViewById(R.id.drawer_layout);
@@ -350,4 +363,38 @@ public class NavDrawerActivity extends BriarActivity implements
 		}
 	}
 
+	private void showTorSettingsDialog(int reasonsDisabled) {
+		boolean battery = (reasonsDisabled & REASON_BATTERY) != 0;
+		boolean mobileData = (reasonsDisabled & REASON_MOBILE_DATA) != 0;
+		boolean location = (reasonsDisabled & REASON_COUNTRY_BLOCKED) != 0;
+
+		StringBuilder s = new StringBuilder();
+		if (location) {
+			s.append("\t\u2022 ");
+			s.append(getString(R.string.tor_override_network_setting,
+					getCountryDisplayName(locationUtils.getCurrentCountry())));
+			s.append('\n');
+		}
+		if (mobileData) {
+			s.append("\t\u2022 ");
+			s.append(getString(R.string.tor_override_mobile_data_setting));
+			s.append('\n');
+		}
+		if (battery) {
+			s.append("\t\u2022 ");
+			s.append(getString(R.string.tor_only_when_charging_title));
+			s.append('\n');
+		}
+		String message =
+				getString(R.string.tor_override_settings_body, s.toString());
+
+		AlertDialog.Builder b =
+				new AlertDialog.Builder(this, R.style.BriarDialogTheme);
+		b.setMessage(message);
+		b.setPositiveButton(R.string.continue_button, (dialog, which) ->
+				viewModel.setTorEnabled(battery, mobileData, location));
+		b.setNegativeButton(R.string.cancel, (dialog, which) ->
+				dialog.dismiss());
+		b.show();
+	}
 }

briar-android/src/main/java/org/briarproject/briar/android/navdrawer/NavDrawerViewModel.java

@@ -34,7 +34,12 @@ import static java.util.concurrent.TimeUnit.DAYS;
 import static java.util.logging.Level.INFO;
 import static java.util.logging.Level.WARNING;
 import static java.util.logging.Logger.getLogger;
+import static org.briarproject.bramble.api.plugin.Plugin.PREF_PLUGIN_ENABLE;
 import static org.briarproject.bramble.api.plugin.Plugin.State.STARTING_STOPPING;
+import static org.briarproject.bramble.api.plugin.TorConstants.PREF_TOR_MOBILE;
+import static org.briarproject.bramble.api.plugin.TorConstants.PREF_TOR_NETWORK;
+import static org.briarproject.bramble.api.plugin.TorConstants.PREF_TOR_NETWORK_WITH_BRIDGES;
+import static org.briarproject.bramble.api.plugin.TorConstants.PREF_TOR_ONLY_WHEN_CHARGING;
 import static org.briarproject.bramble.util.LogUtils.logException;
 import static org.briarproject.briar.android.TestingConstants.EXPIRY_DATE;
 import static org.briarproject.briar.android.TestingConstants.IS_DEBUG_BUILD;
@@ -216,8 +221,31 @@ public class NavDrawerViewModel extends AndroidViewModel
 		return liveData;
 	}
 
+	int getReasonsDisabled(TransportId id) {
+		Plugin plugin = pluginManager.getPlugin(id);
+		return plugin == null ? 0 : plugin.getReasonsDisabled();
+	}
+
 	void setPluginEnabled(TransportId t, boolean enabled) {
 		pluginManager.setPluginEnabled(t, enabled);
 	}
 
+	void setTorEnabled(boolean battery, boolean mobileData, boolean location) {
+		Plugin plugin = pluginManager.getPlugin(TorConstants.ID);
+		if (plugin == null) return;
+
+		Settings s = new Settings();
+		s.putBoolean(PREF_PLUGIN_ENABLE, true);
+		if (battery) s.putBoolean(PREF_TOR_ONLY_WHEN_CHARGING, false);
+		if (mobileData) s.putBoolean(PREF_TOR_MOBILE, true);
+		if (location) s.putInt(PREF_TOR_NETWORK, PREF_TOR_NETWORK_WITH_BRIDGES);
+		dbExecutor.execute(() -> {
+			try {
+				settingsManager.mergeSettings(s, TorConstants.ID.getString());
+			} catch (DbException e) {
+				logException(LOG, WARNING, e);
+			}
+		});
+	}
+
 }

briar-android/src/main/java/org/briarproject/briar/android/navdrawer/PluginViewController.java

@@ -10,6 +10,8 @@ import org.briarproject.bramble.api.plugin.Plugin.State;
 import org.briarproject.bramble.api.plugin.TorConstants;
 import org.briarproject.bramble.api.plugin.TransportId;
 import org.briarproject.briar.R;
+import org.briarproject.briar.android.viewmodel.LiveEvent;
+import org.briarproject.briar.android.viewmodel.MutableLiveEvent;
 
 import androidx.appcompat.widget.AppCompatImageButton;
 import androidx.appcompat.widget.SwitchCompat;
@@ -21,6 +23,7 @@ import static android.os.Build.VERSION.SDK_INT;
 import static android.transition.TransitionManager.beginDelayedTransition;
 import static android.view.View.FOCUS_DOWN;
 import static androidx.core.content.ContextCompat.getColor;
+import static org.briarproject.bramble.api.plugin.Plugin.REASON_USER;
 import static org.briarproject.bramble.api.plugin.Plugin.State.ACTIVE;
 import static org.briarproject.bramble.api.plugin.Plugin.State.DISABLED;
 import static org.briarproject.bramble.api.plugin.Plugin.State.ENABLING;
@@ -29,16 +32,20 @@ import static org.briarproject.briar.android.navdrawer.NavDrawerViewModel.TRANSP
 
 class PluginViewController {
 
+	private final NavDrawerViewModel viewModel;
 	private final ConstraintLayout drawerContent;
 	private final ConstraintSet collapsedConstraints, expandedConstraints;
 	private final AppCompatImageButton chevronView;
 	private final ImageView torIcon, wifiIcon, btIcon;
 	private final SwitchCompat torSwitch, wifiSwitch, btSwitch;
+	private final MutableLiveEvent<Integer> reasonsTorDisabled =
+			new MutableLiveEvent<>();
 
 	private boolean expanded = false;
 
 	PluginViewController(View v, LifecycleOwner owner,
 			NavDrawerViewModel viewModel) {
+		this.viewModel = viewModel;
 		drawerContent = v.findViewById(R.id.drawerContent);
 
 		collapsedConstraints = new ConstraintSet();
@@ -75,8 +82,8 @@ class PluginViewController {
 			// a OnCheckedChangeListener would get triggered on programmatic updates
 			SwitchCompat switchCompat = getSwitch(t);
 			switchCompat.setOnClickListener(buttonView -> {
-				// TODO check reason first and change settings if needed
+				if (switchCompat.isChecked()) tryToEnablePlugin(t);
-				viewModel.setPluginEnabled(t, switchCompat.isChecked());
+				else viewModel.setPluginEnabled(t, false);
 				// Revert the switch to its previous state until the plugin
 				// changes its state
 				switchCompat.toggle();
@@ -98,6 +105,23 @@ class PluginViewController {
 		expanded = !expanded;
 	}
 
+	LiveEvent<Integer> getReasonsTorDisabled() {
+		return reasonsTorDisabled;
+	}
+
+	private void tryToEnablePlugin(TransportId id) {
+		if (id.equals(TorConstants.ID)) {
+			int reasons = viewModel.getReasonsDisabled(id);
+			if (reasons == 0 || reasons == REASON_USER) {
+				viewModel.setPluginEnabled(id, true);
+			} else {
+				reasonsTorDisabled.setEvent(reasons);
+			}
+		} else {
+			viewModel.setPluginEnabled(id, true);
+		}
+	}
+
 	private void stateUpdate(TransportId id, State state) {
 		updateIcon(getIcon(id), state);
 		updateSwitch(getSwitch(id), state);

briar-android/src/main/java/org/briarproject/briar/android/settings/SettingsFragment.java

@@ -85,6 +85,7 @@ import static org.briarproject.briar.android.BriarApplication.ENTRY_ACTIVITY;
 import static org.briarproject.briar.android.TestingConstants.IS_DEBUG_BUILD;
 import static org.briarproject.briar.android.activity.RequestCodes.REQUEST_RINGTONE;
 import static org.briarproject.briar.android.navdrawer.NavDrawerActivity.SIGN_OUT_URI;
+import static org.briarproject.briar.android.util.UiUtils.getCountryDisplayName;
 import static org.briarproject.briar.android.util.UiUtils.hasScreenLock;
 import static org.briarproject.briar.android.util.UiUtils.triggerFeedback;
 import static org.briarproject.briar.api.android.AndroidNotificationManager.BLOG_CHANNEL_ID;
@@ -316,13 +317,8 @@ public class SettingsFragment extends PreferenceFragmentCompat
 
 		// Look up country name in the user's chosen language if available
 		String country = locationUtils.getCurrentCountry();
-		String countryName = country;
+		String countryName = getCountryDisplayName(country);
-		for (Locale locale : Locale.getAvailableLocales()) {
+
-			if (locale.getCountry().equalsIgnoreCase(country)) {
-				countryName = locale.getDisplayCountry();
-				break;
-			}
-		}
 		boolean blocked =
 				circumventionProvider.isTorProbablyBlocked(country);
 		boolean useBridges = circumventionProvider.doBridgesWork(country);

briar-android/src/main/java/org/briarproject/briar/android/util/UiUtils.java

@@ -38,6 +38,8 @@ import org.briarproject.briar.R;
 import org.briarproject.briar.android.view.ArticleMovementMethod;
 import org.briarproject.briar.android.widget.LinkDialogFragment;
 
+import java.util.Locale;
+
 import androidx.annotation.AttrRes;
 import androidx.annotation.ColorInt;
 import androidx.annotation.ColorRes;
@@ -401,4 +403,14 @@ public class UiUtils {
 		return ctx.getResources().getConfiguration().getLayoutDirection() ==
 				LAYOUT_DIRECTION_RTL;
 	}
+
+	public static String getCountryDisplayName(String isoCode) {
+		for (Locale locale : Locale.getAvailableLocales()) {
+			if (locale.getCountry().equalsIgnoreCase(isoCode)) {
+				return locale.getDisplayCountry();
+			}
+		}
+		// Name is unknown
+		return isoCode;
+	}
 }

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

@@ -569,6 +569,11 @@
 	<string name="lock_is_locked">Briar is locked</string>
 	<string name="lock_tap_to_unlock">Tap to unlock</string>
 
+	<!-- Overriding Tor settings -->
+	<string name="tor_override_settings_body">Turning on Tor will change the following settings:\n\n%1$s</string>
+	<string name="tor_override_mobile_data_setting">Don\'t use mobile data</string>
+	<string name="tor_override_network_setting">Don\'t connect to Internet (Tor) in %1$s</string>
+
 	<!-- Screenshots -->
 
 	<!-- This is a name to be used in screenshots. Feel free to change it to a local name. -->