use json persistence for sparrow wallet export, add sparrow wallet import to wallets dir

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

@@ -858,10 +858,6 @@ public class AppServices {
                     deviceEnumerateService = createDeviceEnumerateService();
                 }
 
-                if(deviceEnumerateService.isRunning()) {
-                    deviceEnumerateService.cancel();
-                }
-
                 if(deviceEnumerateService.getState() == Worker.State.CANCELLED) {
                     deviceEnumerateService.reset();
                 }

src/main/java/com/sparrowwallet/sparrow/control/FileWalletExportPane.java

@@ -9,10 +9,7 @@ import com.sparrowwallet.sparrow.event.StorageEvent;
 import com.sparrowwallet.sparrow.event.TimedEvent;
 import com.sparrowwallet.sparrow.event.WalletExportEvent;
 import com.sparrowwallet.sparrow.glyphfont.FontAwesome5;
-import com.sparrowwallet.sparrow.io.CoboVaultMultisig;
-import com.sparrowwallet.sparrow.io.PassportMultisig;
-import com.sparrowwallet.sparrow.io.Storage;
-import com.sparrowwallet.sparrow.io.WalletExport;
+import com.sparrowwallet.sparrow.io.*;
 import javafx.geometry.Pos;
 import javafx.scene.control.Button;
 import javafx.scene.control.Control;
@@ -83,8 +80,8 @@ public class FileWalletExportPane extends TitledDescriptionPane {
         FileChooser fileChooser = new FileChooser();
         fileChooser.setTitle("Export " + exporter.getWalletModel().toDisplayString() + " File");
         String extension = exporter.getExportFileExtension(wallet);
-        fileChooser.setInitialFileName(wallet.getName() + "-" +
-                exporter.getWalletModel().toDisplayString().toLowerCase().replace(" ", "") +
+        fileChooser.setInitialFileName(wallet.getName() +
+                (exporter instanceof Sparrow ? "" : "-" + exporter.getWalletModel().toDisplayString().toLowerCase().replace(" ", "")) +
                 (extension == null || extension.isEmpty() ? "" : "." + extension));
 
         AppServices.moveToActiveWindowScreen(window, 800, 450);
@@ -137,7 +134,7 @@ public class FileWalletExportPane extends TitledDescriptionPane {
                 QRDisplayDialog qrDisplayDialog;
                 if(exporter instanceof CoboVaultMultisig) {
                     qrDisplayDialog = new QRDisplayDialog(RegistryType.BYTES.toString(), outputStream.toByteArray(), true);
-                } else if(exporter instanceof PassportMultisig) {
+                } else if(exporter instanceof PassportMultisig || exporter instanceof KeystoneMultisig) {
                     qrDisplayDialog = new QRDisplayDialog(RegistryType.BYTES.toString(), outputStream.toByteArray(), false);
                 } else {
                     qrDisplayDialog = new QRDisplayDialog(outputStream.toString(StandardCharsets.UTF_8));

src/main/java/com/sparrowwallet/sparrow/control/WalletImportDialog.java

@@ -53,7 +53,7 @@ public class WalletImportDialog extends Dialog<Wallet> {
             importAccordion.getPanes().add(importPane);
         }
 
-        List<WalletImport> walletImporters = List.of(new ColdcardMultisig(), new CoboVaultMultisig(), new Electrum(), new KeystoneMultisig(), new SpecterDesktop(), new BlueWalletMultisig());
+        List<WalletImport> walletImporters = List.of(new ColdcardMultisig(), new CoboVaultMultisig(), new Electrum(), new KeystoneMultisig(), new SpecterDesktop(), new BlueWalletMultisig(), new Sparrow());
         for(WalletImport importer : walletImporters) {
             FileWalletImportPane importPane = new FileWalletImportPane(importer);
             importAccordion.getPanes().add(importPane);

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

@@ -1,15 +1,19 @@
 package com.sparrowwallet.sparrow.io;
 
+import com.google.common.io.Files;
 import com.sparrowwallet.drongo.wallet.Wallet;
 import com.sparrowwallet.drongo.wallet.WalletModel;
 import com.sparrowwallet.sparrow.AppServices;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import java.io.File;
+import java.io.IOException;
+import java.io.InputStream;
 import java.io.OutputStream;
-import java.nio.file.Files;
+import java.nio.file.StandardCopyOption;
 
-public class Sparrow implements WalletExport {
+public class Sparrow implements WalletImport, WalletExport {
     private static final Logger log = LoggerFactory.getLogger(Sparrow.class);
 
     @Override
@@ -26,8 +30,14 @@ public class Sparrow implements WalletExport {
     public void exportWallet(Wallet wallet, OutputStream outputStream) throws ExportException {
         try {
             Storage storage = AppServices.get().getOpenWallets().get(wallet);
-            storage.copyWallet(outputStream);
+            File tempFile = File.createTempFile(wallet.getName(), null);
+            Storage tempStorage = new Storage(PersistenceType.JSON, tempFile);
+            tempStorage.setKeyDeriver(storage.getKeyDeriver());
+            tempStorage.setEncryptionPubKey(storage.getEncryptionPubKey());
+            tempStorage.saveWallet(wallet);
+            Files.copy(tempStorage.getWalletFile(), outputStream);
             outputStream.flush();
+            tempStorage.getWalletFile().delete();
         } catch(Exception e) {
             log.error("Error exporting Sparrow wallet file", e);
             throw new ExportException("Error exporting Sparrow wallet file", e);
@@ -36,13 +46,19 @@ public class Sparrow implements WalletExport {
 
     @Override
     public String getWalletExportDescription() {
-        return "Exports a copy of your Sparrow wallet file, which can be loaded in another Sparrow instance running on any supported platform.";
+        return "Exports your Sparrow wallet file, which can be imported into another Sparrow instance running on any supported platform.";
     }
 
     @Override
     public String getExportFileExtension(Wallet wallet) {
-        Storage storage = AppServices.get().getOpenWallets().get(wallet);
-        return storage.getWalletFileExtension();
+        try {
+            Storage storage = AppServices.get().getOpenWallets().get(wallet);
+            return storage.isEncrypted() ? "" : PersistenceType.JSON.getExtension();
+        } catch(IOException e) {
+            //ignore
+        }
+
+        return "";
     }
 
     @Override
@@ -54,4 +70,41 @@ public class Sparrow implements WalletExport {
     public boolean walletExportRequiresDecryption() {
         return false;
     }
+
+    @Override
+    public boolean isEncrypted(File file) {
+        return Storage.isEncrypted(file);
+    }
+
+    @Override
+    public String getWalletImportDescription() {
+        return "Imports an exported Sparrow wallet file into Sparrow's wallets folder.";
+    }
+
+    @Override
+    public Wallet importWallet(InputStream inputStream, String password) throws ImportException {
+        File tempFile = null;
+        try {
+            tempFile = File.createTempFile("sparrow", null);
+            java.nio.file.Files.copy(inputStream, tempFile.toPath(), StandardCopyOption.REPLACE_EXISTING);
+            Storage storage = new Storage(PersistenceType.JSON, tempFile);
+            if(!isEncrypted(tempFile)) {
+                return storage.loadUnencryptedWallet().getWallet();
+            } else {
+                return storage.loadEncryptedWallet(password).getWallet();
+            }
+        } catch(IOException | StorageException e) {
+            log.error("Error importing Sparrow wallet", e);
+            throw new ImportException("Error importing Sparrow wallet", e);
+        } finally {
+            if(tempFile != null) {
+                tempFile.delete();
+            }
+        }
+    }
+
+    @Override
+    public boolean isWalletImportScannable() {
+        return false;
+    }
 }

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

@@ -37,6 +37,7 @@ public class Storage {
     public static final String WALLETS_BACKUP_DIR = "backup";
     public static final String CERTS_DIR = "certs";
     public static final String TEMP_BACKUP_PREFIX = "tmp";
+    public static final List<String> RESERVED_WALLET_NAMES = List.of("temp");
 
     private Persistence persistence;
     private File walletFile;
@@ -284,7 +285,7 @@ public class Storage {
             }
         }
 
-        return false;
+        return RESERVED_WALLET_NAMES.contains(walletName);
     }
 
     public static File getExistingWallet(String walletName) {