Added custom proxy support

app/src/main/java/com/luca0n/joguitos/pluck/activities/TriviaGameActivity.java

@@ -320,7 +320,7 @@ public class TriviaGameActivity extends BaseActivity
 			String json;
 			try {
 				json = ApiUtil.GET(query[0]);
-			} catch (IOException e) {
+			} catch (Exception e) {
 				return null;
 			}
 			return json;

app/src/main/java/com/luca0n/joguitos/pluck/exceptions/MalformedProxyAddressException.java

@@ -0,0 +1,40 @@
+/*
+Pluck: an open source trivia game for Android
+
+Copyright (C) 2021 Joguitos do luca0N!
+
+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 <https://www.gnu.org/licenses/>.
+
+This game is a fork of LibreTrivia, and its source code is available at
+<https://github.com/tryton-vanmeer/LibreTrivia>.
+
+Contact us at <joguitos+pluck@luca0n.com>.
+*/
+
+package com.luca0n.joguitos.pluck.exceptions;
+
+import java.lang.Throwable;
+
+import com.luca0n.joguitos.pluck.exceptions.ProxyException;
+
+public class MalformedProxyAddressException extends ProxyException {
+	public MalformedProxyAddressException(){
+		super();
+	}
+	public MalformedProxyAddressException(String message){
+		super(message);
+	}
+	public MalformedProxyAddressException(Throwable cause){
+		super(cause);
+	}
+}

app/src/main/java/com/luca0n/joguitos/pluck/exceptions/ProxyException.java

@@ -0,0 +1,38 @@
+/*
+Pluck: an open source trivia game for Android
+
+Copyright (C) 2021 Joguitos do luca0N!
+
+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 <https://www.gnu.org/licenses/>.
+
+This game is a fork of LibreTrivia, and its source code is available at
+<https://github.com/tryton-vanmeer/LibreTrivia>.
+
+Contact us at <joguitos+pluck@luca0n.com>.
+*/
+
+package com.luca0n.joguitos.pluck.exceptions;
+
+import java.lang.Throwable;
+
+public class ProxyException extends Exception {
+	public ProxyException(){
+		super();
+	}
+	public ProxyException(String message){
+		super(message);
+	}
+	public ProxyException(Throwable cause){
+		super(cause);
+	}
+}

app/src/main/java/com/luca0n/joguitos/pluck/exceptions/UnknownProxyProtocolException.java

@@ -0,0 +1,40 @@
+/*
+Pluck: an open source trivia game for Android
+
+Copyright (C) 2021 Joguitos do luca0N!
+
+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 <https://www.gnu.org/licenses/>.
+
+This game is a fork of LibreTrivia, and its source code is available at
+<https://github.com/tryton-vanmeer/LibreTrivia>.
+
+Contact us at <joguitos+pluck@luca0n.com>.
+*/
+
+package com.luca0n.joguitos.pluck.exceptions;
+
+import java.lang.Throwable;
+
+import com.luca0n.joguitos.pluck.exceptions.ProxyException;
+
+public class UnknownProxyProtocolException extends ProxyException {
+	public UnknownProxyProtocolException(){
+		super();
+	}
+	public UnknownProxyProtocolException(String message){
+		super(message);
+	}
+	public UnknownProxyProtocolException(Throwable cause){
+		super(cause);
+	}
+}

app/src/main/java/com/luca0n/joguitos/pluck/util/ApiUtil.java

@@ -44,11 +44,15 @@ import java.net.HttpURLConnection;
 import java.net.URL;
 import java.util.ArrayList;
 import java.util.Collections;
+import java.lang.IndexOutOfBoundsException;
 
 import com.luca0n.joguitos.pluck.R;
 import com.luca0n.joguitos.pluck.PluckApplication;
 import com.luca0n.joguitos.pluck.exceptions.NoTriviaResultsException;
 import com.luca0n.joguitos.pluck.exceptions.InvalidTriviaFormatException;
+import com.luca0n.joguitos.pluck.exceptions.ProxyException;
+import com.luca0n.joguitos.pluck.exceptions.UnknownProxyProtocolException;
+import com.luca0n.joguitos.pluck.exceptions.MalformedProxyAddressException;
 import com.luca0n.joguitos.pluck.trivia.TriviaQuery;
 import com.luca0n.joguitos.pluck.trivia.TriviaQuestion;
 import com.luca0n.joguitos.pluck.trivia.TriviaCategory;
@@ -72,7 +76,7 @@ public class ApiUtil {
 		return builder.toString();
 	}
 
-	private static String GET(String query) throws IOException {
+	private static String GET(String query) throws IOException, ProxyException {
 		String response;
 
 		URL url = new URL(query);
@@ -81,17 +85,56 @@ public class ApiUtil {
 		// Check if the player wants to play the game using Tor.
 		Context c = PluckApplication.getAppContext();
 		SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(c);
-		String key = c.getResources().getString(R.string.pref_network_tor);
+		String keyTor = c.getResources().getString(R.string.pref_network_tor);
 		// Connect without Tor by default.
-		boolean useTor = sp.getBoolean(key, false);
+		boolean useTor = sp.getBoolean(keyTor, false);
 		// Default Orbot SOCKS5 address.
 		String orbotSocks5Hostname = "127.0.0.1";
 		int orbotSocks5Port = 9050;
 
+		// Check if the player wants to play the game using a custom proxy.
+		String keyProxy = c.getResources().getString(R.string.pref_network_proxy);
+		boolean useProxy = sp.getBoolean(keyProxy, false);
+		// Get the player custom proxy address.
+		String keyProxyAddress = c.getResources().getString(R.string.pref_network_proxy_address);
+		String proxyAddress = sp.getString(keyProxyAddress, null);
+
 		if (useTor)
 			connection = (HttpURLConnection) url.openConnection(
 					new Proxy(Proxy.Type.SOCKS, new InetSocketAddress(orbotSocks5Hostname, orbotSocks5Port)));
+		else if (useProxy){
+			// The provided custom proxy should be in the following format:
+			// <protocol>://<hostname>:<port>.
+
+			// Make sure the player specified the proxy address.
+			if (proxyAddress == null)
+				throw new MalformedProxyAddressException("A proxy address was expected, but was not specified.");
+
+			// We need to parse the proxy address in order to get the proxy protocol.
+			Proxy.Type protocol = null;
+			if (proxyAddress.startsWith("http:"))
+				protocol = Proxy.Type.HTTP;
+			else if (proxyAddress.startsWith("socks:")
+					|| proxyAddress.startsWith("socks5:"))
+				protocol = Proxy.Type.SOCKS;
 			else
+				// Unknown proxy type.
+				throw new UnknownProxyProtocolException("The client was unable to get the proxy type based on the specified proxy address. It should start with the proxy protocol, like \"http://\" or \"socks5\".");
+
+			// We'll need to get the hostname and the port.
+			String proxyHostname;
+			int proxyPort;
+			try {
+				proxyHostname = proxyAddress.split(":")[1].substring(2); // use substring() in order to ignore the "//".
+				proxyPort = Integer.parseInt(proxyAddress.split(":")[2]);
+			} catch (IndexOutOfBoundsException e){
+				// Throw a new MalformedProxyAddressException exception if the app can't recognize the proxy address.
+				throw new MalformedProxyAddressException();
+			}
+
+			connection = (HttpURLConnection) url.openConnection(
+					new Proxy(protocol, new InetSocketAddress(proxyHostname, proxyPort)));
+		}else
 			connection = (HttpURLConnection) url.openConnection();
 
 		try {
@@ -105,7 +148,7 @@ public class ApiUtil {
 	}
 
 	public static String GET(TriviaQuery query)
-			throws IOException {
+			throws IOException, ProxyException {
 		return GET(query.toString());
 	}
 

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

@@ -95,7 +95,7 @@ Contact us at <joguitos+pluck@luca0n.com>.
 
 	<!-- Error Strings -->
 	<string name="error">Error</string>
-	<string name="error_network"><b>Network error!</b>\n\nCould not connect to a network. Check if your custom server address is correct. If Tor is enabled in the game settings, check if Orbot is running and then try again.</string>
+	<string name="error_network"><b>Network error!</b>\n\nCould not connect to a network. Check the system network settings, the game network settings and then try again.</string>
 	<string name="error_no_trivia_results"><b>No trivia results!</b>\n\nWas not able to find trivia questions that satisfied all options.</string>
 	<string name="error_server_response_invalid"><b>Server response error!</b>\n\nCould not parse the server response. The server response may be in a unsupported version. If you are using a custom server, make sure the server address points to a valid address and then try again.</string>
 	<string name="error_unknown"><b>An unknown error occurred!</b></string>