add testnet4 network support

src/main/java/com/sparrowwallet/sparrow/AppController.java

@@ -391,7 +391,7 @@ public class AppController implements Initializable {
         MenuItem homeItem = new MenuItem("Home Folder...");
         homeItem.setOnAction(this::restartInHome);
         restart.getItems().add(homeItem);
-        List<Network> networks = new ArrayList<>(List.of(Network.MAINNET, Network.TESTNET, Network.SIGNET));
+        List<Network> networks = new ArrayList<>(List.of(Network.MAINNET, Network.TESTNET, Network.TESTNET4, Network.SIGNET));
         networks.remove(Network.get());
         for(Network network : networks) {
             MenuItem networkItem = new MenuItem(network.toDisplayString());

src/main/java/com/sparrowwallet/sparrow/SparrowWallet.java

@@ -66,6 +66,11 @@ public class SparrowWallet {
             Network.set(Network.TESTNET);
         }
 
+        File testnet4Flag = new File(Storage.getSparrowHome(), "network-" + Network.TESTNET4.getName());
+        if(testnet4Flag.exists()) {
+            Network.set(Network.TESTNET4);
+        }
+
         File signetFlag = new File(Storage.getSparrowHome(), "network-" + Network.SIGNET.getName());
         if(signetFlag.exists()) {
             Network.set(Network.SIGNET);

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

@@ -107,7 +107,7 @@ public class CaravanMultisig implements WalletImport, WalletExport {
             CaravanFile cf = new CaravanFile();
             cf.name = wallet.getFullName();
             cf.addressType = wallet.getScriptType().toString().replace('-', '_');
-            cf.network = Network.get().getName();
+            cf.network = Network.getCanonical().getName();
             cf.client = new Client();
 
             Quorum quorum = new Quorum();

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

@@ -36,7 +36,7 @@ public class GordianSeedTool implements KeystoreFileImport {
 
     @Override
     public String getKeystoreImportDescription(int account) {
-        return "Select your seed and scan the QR code created by Authenticate > Derive Key > Other Key Derivations > " + Network.get().toDisplayString() + " > Master Key > Account Descriptor. Click the share icon at the bottom.";
+        return "Select your seed and scan the QR code created by Authenticate > Derive Key > Other Key Derivations > " + Network.getCanonical().getCapitalizedName() + " > Master Key > Account Descriptor. Click the share icon at the bottom.";
     }
 
     @Override

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

@@ -601,7 +601,7 @@ public class Hwi {
     private void addChainType(List<String> elements, boolean commandPresent) {
         if(Network.get() != Network.MAINNET) {
             elements.add(elements.size() - (commandPresent ? 1 : 0), "--chain");
-            elements.add(elements.size() - (commandPresent ? 1 : 0), getChainName(Network.get()));
+            elements.add(elements.size() - (commandPresent ? 1 : 0), getChainName(Network.getCanonical()));
         }
     }
 

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

@@ -19,6 +19,7 @@ import org.slf4j.LoggerFactory;
 import java.io.*;
 import java.nio.charset.StandardCharsets;
 import java.nio.file.Files;
+import java.nio.file.Path;
 import java.nio.file.attribute.PosixFilePermission;
 import java.nio.file.attribute.PosixFilePermissions;
 import java.security.cert.Certificate;
@@ -216,8 +217,8 @@ public class Storage {
     }
 
     private void checkWalletNetwork(Wallet wallet) {
-        if(wallet.getNetwork() != null && wallet.getNetwork() != Network.get()) {
-            throw new IllegalStateException("Provided " + wallet.getNetwork() + " wallet is invalid on a " + Network.get() + " network. Use a " + wallet.getNetwork() + " configuration to load this wallet.");
+        if(wallet.getNetwork() != null && wallet.getNetwork() != Network.getCanonical()) {
+            throw new IllegalStateException("Provided " + wallet.getNetwork() + " wallet is invalid on a " + Network.getCanonical() + " network. Use a " + wallet.getNetwork() + " configuration to load this wallet.");
         }
     }
 
@@ -526,8 +527,21 @@ public class Storage {
 
     public static File getSparrowDir() {
         File sparrowDir;
-        if(Network.get() != Network.MAINNET) {
-            sparrowDir = new File(getSparrowHome(), Network.get().getName());
+        Network network = Network.get();
+        if(network != Network.MAINNET) {
+            sparrowDir = new File(getSparrowHome(), network.getHome());
+            if(!network.getName().equals(network.getHome()) && !sparrowDir.exists()) {
+                File networkNameDir = new File(getSparrowHome(), network.getName());
+                if(networkNameDir.exists() && networkNameDir.isDirectory() && !Files.isSymbolicLink(networkNameDir.toPath())) {
+                    try {
+                        if(networkNameDir.renameTo(sparrowDir)) {
+                            Files.createSymbolicLink(networkNameDir.toPath(), Path.of(sparrowDir.getName()));
+                        }
+                    } catch(Exception e) {
+                        log.debug("Error creating symlink from " + networkNameDir.getAbsolutePath() + " to " + sparrowDir.getName(), e);
+                    }
+                }
+            }
         } else {
             sparrowDir = getSparrowHome();
         }
@@ -536,6 +550,23 @@ public class Storage {
             createOwnerOnlyDirectory(sparrowDir);
         }
 
+        if(!network.getName().equals(network.getHome())) {
+            try {
+                Path networkNamePath = getSparrowHome().toPath().resolve(network.getName());
+                if(Files.isSymbolicLink(networkNamePath)) {
+                    Path symlinkTarget = getSparrowHome().toPath().resolve(Files.readSymbolicLink(networkNamePath));
+                    if(!Files.isSameFile(sparrowDir.toPath(), symlinkTarget)) {
+                        Files.delete(networkNamePath);
+                        Files.createSymbolicLink(networkNamePath, Path.of(sparrowDir.getName()));
+                    }
+                } else if(!Files.exists(networkNamePath)) {
+                    Files.createSymbolicLink(networkNamePath, Path.of(sparrowDir.getName()));
+                }
+            } catch(Exception e) {
+                log.debug("Error updating symlink from " + network.getName() + " to " + sparrowDir.getName(), e);
+            }
+        }
+
         return sparrowDir;
     }
 

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

@@ -119,7 +119,7 @@ public class Bwt {
      */
     private void start(Collection<String> outputDescriptors, Collection<String> addresses, Integer rescanSince, Boolean forceRescan, Integer gapLimit, CallbackNotifier callback) {
         BwtConfig bwtConfig = new BwtConfig();
-        bwtConfig.network = Network.get() == Network.MAINNET ? "bitcoin" : Network.get().getName();
+        bwtConfig.network = Network.get() == Network.MAINNET ? "bitcoin" : Network.getCanonical().getName();
 
         if(!outputDescriptors.isEmpty()) {
             bwtConfig.descriptors = outputDescriptors;

src/main/java/com/sparrowwallet/sparrow/net/cormorant/bitcoind/BitcoindTransport.java

@@ -130,6 +130,8 @@ public class BitcoindTransport implements Transport {
     private static File getCookieDir(File bitcoindDir) {
         if(Network.get() == Network.TESTNET && Files.exists(Path.of(bitcoindDir.getAbsolutePath(), "testnet3", COOKIE_FILENAME))) {
             return new File(bitcoindDir, "testnet3");
+        } else if(Network.get() == Network.TESTNET4 && Files.exists(Path.of(bitcoindDir.getAbsolutePath(), "testnet4", COOKIE_FILENAME))) {
+            return new File(bitcoindDir, "testnet4");
         } else if(Network.get() == Network.REGTEST && Files.exists(Path.of(bitcoindDir.getAbsolutePath(), "regtest", COOKIE_FILENAME))) {
             return new File(bitcoindDir, "regtest");
         } else if(Network.get() == Network.SIGNET && Files.exists(Path.of(bitcoindDir.getAbsolutePath(), "signet", COOKIE_FILENAME))) {