always set charset to utf-8 when converting from bytes to string

src/main/java/com/sparrowwallet/sparrow/io/CoboVaultSinglesig.java

@@ -11,6 +11,7 @@ import com.sparrowwallet.drongo.wallet.*;
 import java.io.File;
 import java.io.InputStream;
 import java.io.InputStreamReader;
+import java.nio.charset.StandardCharsets;
 
 public class CoboVaultSinglesig implements KeystoreFileImport, WalletImport {
     @Override
@@ -32,7 +33,7 @@ public class CoboVaultSinglesig implements KeystoreFileImport, WalletImport {
     public Keystore getKeystore(ScriptType scriptType, InputStream inputStream, String password) throws ImportException {
         try {
             Gson gson = new Gson();
-            CoboVaultSinglesigKeystore coboKeystore = gson.fromJson(new InputStreamReader(inputStream), CoboVaultSinglesigKeystore.class);
+            CoboVaultSinglesigKeystore coboKeystore = gson.fromJson(new InputStreamReader(inputStream, StandardCharsets.UTF_8), CoboVaultSinglesigKeystore.class);
 
             if(coboKeystore.MasterFingerprint == null || coboKeystore.AccountKeyPath == null || coboKeystore.ExtPubKey == null) {
                 throw new ImportException("Not a valid " + getName() + " keystore export");

src/main/java/com/sparrowwallet/sparrow/io/ColdcardMultisig.java

@@ -13,6 +13,7 @@ import com.sparrowwallet.drongo.wallet.Wallet;
 import com.sparrowwallet.drongo.wallet.WalletModel;
 
 import java.io.*;
+import java.nio.charset.StandardCharsets;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Set;
@@ -30,7 +31,7 @@ public class ColdcardMultisig implements WalletImport, KeystoreFileImport, Walle
 
     @Override
     public Keystore getKeystore(ScriptType scriptType, InputStream inputStream, String password) throws ImportException {
-        InputStreamReader reader = new InputStreamReader(inputStream);
+        InputStreamReader reader = new InputStreamReader(inputStream, StandardCharsets.UTF_8);
         ColdcardKeystore cck = Storage.getGson().fromJson(reader, ColdcardKeystore.class);
 
         Keystore keystore = new Keystore("Coldcard");
@@ -94,7 +95,7 @@ public class ColdcardMultisig implements WalletImport, KeystoreFileImport, Walle
         String derivation = null;
 
         try {
-            List<String> lines = CharStreams.readLines(new InputStreamReader(inputStream));
+            List<String> lines = CharStreams.readLines(new InputStreamReader(inputStream, StandardCharsets.UTF_8));
             for (String line : lines) {
                 line = line.trim();
                 if (line.isEmpty()) {

src/main/java/com/sparrowwallet/sparrow/io/ColdcardSinglesig.java

@@ -14,6 +14,7 @@ import java.io.File;
 import java.io.InputStream;
 import java.io.InputStreamReader;
 import java.lang.reflect.Type;
+import java.nio.charset.StandardCharsets;
 import java.util.Map;
 
 public class ColdcardSinglesig implements KeystoreFileImport, WalletImport {
@@ -53,7 +54,7 @@ public class ColdcardSinglesig implements KeystoreFileImport, WalletImport {
             Gson gson = new Gson();
             Type stringStringMap = new TypeToken<Map<String, JsonElement>>() {
             }.getType();
-            Map<String, JsonElement> map = gson.fromJson(new InputStreamReader(inputStream), stringStringMap);
+            Map<String, JsonElement> map = gson.fromJson(new InputStreamReader(inputStream, StandardCharsets.UTF_8), stringStringMap);
 
             if (map.get("xfp") == null) {
                 throw new ImportException("File was not a valid Coldcard wallet export");

src/main/java/com/sparrowwallet/sparrow/io/Electrum.java

@@ -58,9 +58,9 @@ public class Electrum implements KeystoreFileImport, WalletImport, WalletExport
         Reader reader;
         if(password != null) {
             ECKey decryptionKey = Pbkdf2KeyDeriver.DEFAULT_INSTANCE.deriveECKey(password);
-            reader = new InputStreamReader(new InflaterInputStream(new ECIESInputStream(inputStream, decryptionKey)));
+            reader = new InputStreamReader(new InflaterInputStream(new ECIESInputStream(inputStream, decryptionKey)), StandardCharsets.UTF_8);
         } else {
-            reader = new InputStreamReader(inputStream);
+            reader = new InputStreamReader(inputStream, StandardCharsets.UTF_8);
         }
 
         try {

src/main/java/com/sparrowwallet/sparrow/io/IOUtils.java

@@ -1,6 +1,7 @@
 package com.sparrowwallet.sparrow.io;
 
 import java.io.*;
+import java.nio.charset.StandardCharsets;
 import java.nio.file.Files;
 
 public class IOUtils {
@@ -13,7 +14,7 @@ public class IOUtils {
                 }
 
                 if(file.exists()) {
-                    try(BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(file)))) {
+                    try(BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(file), StandardCharsets.UTF_8))) {
                         String line = br.readLine();
                         if(line.startsWith("01000000") || line.startsWith("cHNid")) {
                             return FileType.TEXT;

src/main/java/com/sparrowwallet/sparrow/io/SpecterDIY.java

@@ -12,12 +12,13 @@ import java.io.File;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
+import java.nio.charset.StandardCharsets;
 
 public class SpecterDIY implements KeystoreFileImport {
     @Override
     public Keystore getKeystore(ScriptType scriptType, InputStream inputStream, String password) throws ImportException {
         try {
-            String text = CharStreams.toString(new InputStreamReader(inputStream));
+            String text = CharStreams.toString(new InputStreamReader(inputStream, StandardCharsets.UTF_8));
             String outputDesc = "sh(" + text + ")";
             OutputDescriptor outputDescriptor = OutputDescriptor.getOutputDescriptor(outputDesc);
             Wallet wallet = outputDescriptor.toWallet();

src/main/java/com/sparrowwallet/sparrow/io/SpecterDesktop.java

@@ -51,7 +51,7 @@ public class SpecterDesktop implements WalletImport, WalletExport {
     public Wallet importWallet(InputStream inputStream, String password) throws ImportException {
         try {
             Gson gson = new Gson();
-            SpecterWallet specterWallet = gson.fromJson(new InputStreamReader(inputStream), SpecterWallet.class);
+            SpecterWallet specterWallet = gson.fromJson(new InputStreamReader(inputStream, StandardCharsets.UTF_8), SpecterWallet.class);
 
             if(specterWallet.descriptor != null) {
                 OutputDescriptor outputDescriptor = OutputDescriptor.getOutputDescriptor(specterWallet.descriptor);

src/main/java/com/sparrowwallet/sparrow/net/TcpTransport.java

@@ -12,6 +12,7 @@ import org.slf4j.LoggerFactory;
 import javax.net.SocketFactory;
 import java.io.*;
 import java.net.Socket;
+import java.nio.charset.StandardCharsets;
 import java.util.Objects;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.locks.Condition;
@@ -130,7 +131,7 @@ public class TcpTransport implements Transport, Closeable {
                 Thread.currentThread().interrupt();
             }
 
-            BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
+            BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream(), StandardCharsets.UTF_8));
 
             while(running) {
                 try {

src/main/java/com/sparrowwallet/sparrow/net/VersionCheckService.java

@@ -16,6 +16,7 @@ import javax.net.ssl.HttpsURLConnection;
 import java.io.IOException;
 import java.io.InputStreamReader;
 import java.net.URL;
+import java.nio.charset.StandardCharsets;
 import java.security.SignatureException;
 import java.util.Map;
 
@@ -45,7 +46,7 @@ public class VersionCheckService extends ScheduledService<VersionUpdatedEvent> {
         URL url = new URL(VERSION_CHECK_URL);
         HttpsURLConnection conn = (HttpsURLConnection)url.openConnection();
 
-        try(InputStreamReader reader = new InputStreamReader(conn.getInputStream())) {
+        try(InputStreamReader reader = new InputStreamReader(conn.getInputStream(), StandardCharsets.UTF_8)) {
             Gson gson = new Gson();
             return gson.fromJson(reader, VersionCheck.class);
         }