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/**
* Copyright (c) 2013 LEAP Encryption Access Project and contributers
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package se.leap.bitmaskclient.eip;
import static se.leap.bitmaskclient.base.models.Constants.FULLNESS;
import static se.leap.bitmaskclient.base.models.Constants.HOST;
import static se.leap.bitmaskclient.base.models.Constants.IP_ADDRESS;
import static se.leap.bitmaskclient.base.models.Constants.LOCATION;
import static se.leap.bitmaskclient.base.models.Constants.LOCATIONS;
import static se.leap.bitmaskclient.base.models.Constants.NAME;
import static se.leap.bitmaskclient.base.models.Constants.OPENVPN_CONFIGURATION;
import static se.leap.bitmaskclient.base.models.Constants.OVERLOAD;
import static se.leap.bitmaskclient.base.models.Constants.TIMEZONE;
import static se.leap.bitmaskclient.base.models.Constants.VERSION;
import android.content.Context;
import androidx.annotation.NonNull;
import com.google.gson.Gson;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.IOException;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Set;
import de.blinkt.openvpn.VpnProfile;
import de.blinkt.openvpn.core.ConfigParser;
import de.blinkt.openvpn.core.connection.Connection;
import se.leap.bitmaskclient.base.utils.ConfigHelper;
import se.leap.bitmaskclient.base.utils.PreferenceHelper;
/**
* Gateway provides objects defining gateways and their metadata.
* Each instance contains a VpnProfile for OpenVPN specific data and member
* variables describing capabilities and location (name)
*
* @author Sean Leonard <meanderingcode@aetherislands.net>
* @author Parménides GV <parmegv@sdf.org>
* @author cyberta
*/
public class Gateway {
public final static String TAG = Gateway.class.getSimpleName();
private JSONObject generalConfiguration;
private JSONObject secrets;
private JSONObject gateway;
private JSONObject load;
// the location of a gateway is its name
private String name;
private int timezone;
private int apiVersion;
private HashMap<Connection.TransportType, VpnProfile> vpnProfiles;
/**
* Build a gateway object from a JSON OpenVPN gateway definition in eip-service.json
* and create a VpnProfile belonging to it.
*/
public Gateway(JSONObject eipDefinition, JSONObject secrets, JSONObject gateway, Context context)
throws ConfigParser.ConfigParseError, JSONException, IOException {
this(eipDefinition, secrets, gateway, null, context);
}
public Gateway(JSONObject eipDefinition, JSONObject secrets, JSONObject gateway, JSONObject load, Context context)
throws ConfigParser.ConfigParseError, JSONException, IOException {
this.gateway = gateway;
this.secrets = secrets;
this.load = load;
generalConfiguration = getGeneralConfiguration(eipDefinition);
timezone = getTimezone(eipDefinition);
name = locationAsName(eipDefinition);
apiVersion = getApiVersion(eipDefinition);
vpnProfiles = createVPNProfiles(context);
}
public void updateLoad(JSONObject load) {
this.load = load;
}
private void addProfileInfos(Context context, HashMap<Connection.TransportType, VpnProfile> profiles) {
Set<String> excludedAppsVpn = PreferenceHelper.getExcludedApps(context);
for (VpnProfile profile : profiles.values()) {
profile.mName = name;
profile.mGatewayIp = gateway.optString(IP_ADDRESS);
if (excludedAppsVpn != null) {
profile.mAllowedAppsVpn = new HashSet<>(excludedAppsVpn);
}
}
}
private JSONObject getGeneralConfiguration(JSONObject eipDefinition) {
try {
return eipDefinition.getJSONObject(OPENVPN_CONFIGURATION);
} catch (JSONException e) {
return new JSONObject();
}
}
private int getTimezone(JSONObject eipDefinition) {
JSONObject location = getLocationInfo(eipDefinition);
return location.optInt(TIMEZONE);
}
private int getApiVersion(JSONObject eipDefinition) {
return eipDefinition.optInt(VERSION);
}
public String getRemoteIP() {
return gateway.optString(IP_ADDRESS);
}
public String getHost() {
return gateway.optString(HOST);
}
private String locationAsName(JSONObject eipDefinition) {
JSONObject location = getLocationInfo(eipDefinition);
return location.optString(NAME);
}
private JSONObject getLocationInfo(JSONObject eipDefinition) {
try {
JSONObject locations = eipDefinition.getJSONObject(LOCATIONS);
return locations.getJSONObject(gateway.getString(LOCATION));
} catch (JSONException e) {
return new JSONObject();
}
}
public boolean hasLoadInfo() {
return load != null;
}
public double getFullness() {
try {
return load.getDouble(FULLNESS);
} catch (JSONException | NullPointerException e) {
return ConfigHelper.getConnectionQualityFromTimezoneDistance(timezone);
}
}
public boolean isOverloaded() {
try {
return load.getBoolean(OVERLOAD);
} catch (JSONException | NullPointerException e) {
return false;
}
}
/**
* Create and attach the VpnProfile to our gateway object
*/
private @NonNull HashMap<Connection.TransportType, VpnProfile> createVPNProfiles(Context context)
throws ConfigParser.ConfigParseError, IOException, JSONException {
boolean preferUDP = PreferenceHelper.getPreferUDP(context);
boolean allowExperimentalTransports = PreferenceHelper.allowExperimentalTransports(context);
VpnConfigGenerator vpnConfigurationGenerator = new VpnConfigGenerator(generalConfiguration, secrets, gateway, apiVersion, preferUDP, allowExperimentalTransports);
HashMap<Connection.TransportType, VpnProfile> profiles = vpnConfigurationGenerator.generateVpnProfiles();
addProfileInfos(context, profiles);
return profiles;
}
public String getName() {
return name;
}
public HashMap<Connection.TransportType, VpnProfile> getProfiles() {
return vpnProfiles;
}
public VpnProfile getProfile(Connection.TransportType transportType) {
return vpnProfiles.get(transportType);
}
public boolean supportsTransport(Connection.TransportType transportType) {
if (transportType == Connection.TransportType.PT) {
return supportsPluggableTransports();
}
return vpnProfiles.get(transportType) != null;
}
public HashSet<Connection.TransportType> getSupportedTransports() {
return new HashSet<>(vpnProfiles.keySet());
}
public boolean supportsPluggableTransports() {
for (Connection.TransportType transportType : vpnProfiles.keySet()) {
if (transportType.isPluggableTransport() && vpnProfiles.get(transportType) != null) {
return true;
}
}
return false;
}
public int getTimezone() {
return timezone;
}
@Override
public String toString() {
return new Gson().toJson(this, Gateway.class);
}
}
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