initial specter wallet import and export functionality

drongo

@@ -1 +1 @@
-Subproject commit 10ebfe463d504f39be2aacec41d48c2cf5ba4c56
+Subproject commit 70fdecf919ea9dcae46cc35df23e0a20ba90683f

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

@@ -8,6 +8,7 @@ import com.sparrowwallet.sparrow.EventManager;
 import com.sparrowwallet.sparrow.event.WalletExportEvent;
 import com.sparrowwallet.sparrow.io.ColdcardMultisig;
 import com.sparrowwallet.sparrow.io.Electrum;
+import com.sparrowwallet.sparrow.io.Specter;
 import com.sparrowwallet.sparrow.io.WalletExport;
 import javafx.scene.control.*;
 import javafx.scene.layout.AnchorPane;
@@ -43,9 +44,9 @@ public class WalletExportDialog extends Dialog<Wallet> {
 
         List<WalletExport> exporters;
         if(wallet.getPolicyType() == PolicyType.SINGLE) {
-            exporters = List.of(new Electrum());
+            exporters = List.of(new Electrum(), new Specter());
         } else if(wallet.getPolicyType() == PolicyType.MULTI) {
-            exporters = List.of(new ColdcardMultisig(), new Electrum());
+            exporters = List.of(new ColdcardMultisig(), new Electrum(), new Specter());
         } else {
             throw new UnsupportedOperationException("Cannot export wallet with policy type " + wallet.getPolicyType());
         }

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

@@ -31,7 +31,7 @@ public class WalletImportDialog extends Dialog<Wallet> {
         stackPane.getChildren().add(anchorPane);
 
         ScrollPane scrollPane = new ScrollPane();
-        scrollPane.setPrefHeight(320);
+        scrollPane.setPrefHeight(400);
         scrollPane.setHbarPolicy(ScrollPane.ScrollBarPolicy.NEVER);
         anchorPane.getChildren().add(scrollPane);
         scrollPane.setFitToWidth(true);
@@ -45,7 +45,7 @@ public class WalletImportDialog extends Dialog<Wallet> {
             importAccordion.getPanes().add(importPane);
         }
 
-        List<WalletImport> walletImporters = List.of(new ColdcardMultisig(), new Electrum());
+        List<WalletImport> walletImporters = List.of(new ColdcardMultisig(), new Electrum(), new Specter());
         for(WalletImport importer : walletImporters) {
             FileWalletImportPane importPane = new FileWalletImportPane(importer);
             importAccordion.getPanes().add(importPane);
@@ -55,7 +55,7 @@ public class WalletImportDialog extends Dialog<Wallet> {
         final ButtonType cancelButtonType = new javafx.scene.control.ButtonType("Cancel", ButtonBar.ButtonData.CANCEL_CLOSE);
         dialogPane.getButtonTypes().addAll(cancelButtonType);
         dialogPane.setPrefWidth(500);
-        dialogPane.setPrefHeight(400);
+        dialogPane.setPrefHeight(480);
 
         setResultConverter(dialogButton -> dialogButton != cancelButtonType ? wallet : null);
     }

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

@@ -0,0 +1,93 @@
+package com.sparrowwallet.sparrow.io;
+
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
+import com.sparrowwallet.drongo.OutputDescriptor;
+import com.sparrowwallet.drongo.wallet.Wallet;
+import com.sparrowwallet.drongo.wallet.WalletModel;
+
+import java.io.File;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.OutputStream;
+import java.nio.charset.StandardCharsets;
+
+public class Specter implements WalletImport, WalletExport {
+    @Override
+    public void exportWallet(Wallet wallet, OutputStream outputStream) throws ExportException {
+        try {
+            SpecterWallet specterWallet = new SpecterWallet();
+            specterWallet.label = wallet.getName();
+            specterWallet.blockheight = wallet.getStoredBlockHeight();
+            specterWallet.descriptor = OutputDescriptor.getOutputDescriptor(wallet).toString();
+
+            Gson gson = new GsonBuilder().setPrettyPrinting().disableHtmlEscaping().create();
+            String json = gson.toJson(specterWallet);
+            outputStream.write(json.getBytes(StandardCharsets.UTF_8));
+            outputStream.flush();
+            outputStream.close();
+        } catch(Exception e) {
+            throw new ExportException(e);
+        }
+    }
+
+    @Override
+    public String getWalletExportDescription() {
+        return "Export a Specter wallet that can be read by Specter Desktop using Add new wallet > Import from wallet software";
+    }
+
+    @Override
+    public String getExportFileExtension() {
+        return "json";
+    }
+
+    @Override
+    public String getWalletImportDescription() {
+        return "Import a Specter wallet created by using the Wallets > Settings > Export to Wallet Software in Specter Desktop";
+    }
+
+    @Override
+    public Wallet importWallet(InputStream inputStream, String password) throws ImportException {
+        try {
+            Gson gson = new Gson();
+            SpecterWallet specterWallet = gson.fromJson(new InputStreamReader(inputStream), SpecterWallet.class);
+
+            if(specterWallet.descriptor != null) {
+                OutputDescriptor outputDescriptor = OutputDescriptor.getOutputDescriptor(specterWallet.descriptor);
+                Wallet wallet = outputDescriptor.toWallet();
+                wallet.setName(specterWallet.label);
+
+                if(!wallet.isValid()) {
+                    throw new ImportException("Specter wallet file did not contain a valid wallet");
+                }
+
+                return wallet;
+            }
+        } catch(Exception e) {
+            throw new ImportException(e);
+        }
+
+        throw new ImportException("Could not import Specter wallet");
+    }
+
+    @Override
+    public boolean isEncrypted(File file) {
+        return false;
+    }
+
+    @Override
+    public String getName() {
+        return "Specter";
+    }
+
+    @Override
+    public WalletModel getWalletModel() {
+        return WalletModel.SPECTER;
+    }
+
+    public static class SpecterWallet {
+        public String label;
+        public Integer blockheight;
+        public String descriptor;
+    }
+}