add export to specter diy

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

@@ -43,7 +43,7 @@ public class WalletExportDialog extends Dialog<Wallet> {
         if(wallet.getPolicyType() == PolicyType.SINGLE) {
             exporters = List.of(new Electrum(), new SpecterDesktop(), new Sparrow());
         } else if(wallet.getPolicyType() == PolicyType.MULTI) {
-            exporters = List.of(new ColdcardMultisig(), new CoboVaultMultisig(), new Electrum(), new PassportMultisig(), new SpecterDesktop(), new BlueWalletMultisig(), new Sparrow());
+            exporters = List.of(new ColdcardMultisig(), new CoboVaultMultisig(), new Electrum(), new PassportMultisig(), new SpecterDesktop(), new BlueWalletMultisig(), new SpecterDIY(), new Sparrow());
         } else {
             throw new UnsupportedOperationException("Cannot export wallet with policy type " + wallet.getPolicyType());
         }

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

@@ -180,7 +180,7 @@ public class ColdcardMultisig implements WalletImport, KeystoreFileImport, Walle
         }
 
         try {
-            BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(outputStream));
+            BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(outputStream, StandardCharsets.UTF_8));
             writer.append("# " + getName() + " setup file (created by Sparrow)\n");
             writer.append("#\n");
             writer.append("Name: ").append(wallet.getName()).append("\n");

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

@@ -10,13 +10,10 @@ import com.sparrowwallet.drongo.wallet.WalletModel;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import java.io.File;
+import java.io.*;
-import java.io.IOException;
-import java.io.InputStream;
-import java.io.InputStreamReader;
 import java.nio.charset.StandardCharsets;
 
-public class SpecterDIY implements KeystoreFileImport {
+public class SpecterDIY implements KeystoreFileImport, WalletExport {
     private static final Logger log = LoggerFactory.getLogger(SpecterDIY.class);
 
     @Override
@@ -67,4 +64,36 @@ public class SpecterDIY implements KeystoreFileImport {
     public WalletModel getWalletModel() {
         return WalletModel.SPECTER_DIY;
     }
+
+    @Override
+    public void exportWallet(Wallet wallet, OutputStream outputStream) throws ExportException {
+        try {
+            BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(outputStream, StandardCharsets.UTF_8));
+            writer.append("addwallet ").append(wallet.getName()).append("&").append(OutputDescriptor.getOutputDescriptor(wallet).toString().replace('\'', 'h')).append("\n");
+            writer.flush();
+        } catch(Exception e) {
+            log.error("Error exporting Specter DIY wallet", e);
+            throw new ExportException("Error exporting Specter DIY wallet", e);
+        }
+    }
+
+    @Override
+    public String getWalletExportDescription() {
+        return "Export file or QR that can be read by your Specter DIY using the Wallets > Add Wallet feature.";
+    }
+
+    @Override
+    public String getExportFileExtension(Wallet wallet) {
+        return "txt";
+    }
+
+    @Override
+    public boolean isWalletExportScannable() {
+        return true;
+    }
+
+    @Override
+    public boolean walletExportRequiresDecryption() {
+        return false;
+    }
 }

src/test/java/com/sparrowwallet/sparrow/io/SpecterDIYTest.java

@@ -1,12 +1,18 @@
 package com.sparrowwallet.sparrow.io;
 
+import com.google.common.io.ByteStreams;
 import com.sparrowwallet.drongo.ExtendedKey;
 import com.sparrowwallet.drongo.Network;
+import com.sparrowwallet.drongo.OutputDescriptor;
 import com.sparrowwallet.drongo.protocol.ScriptType;
 import com.sparrowwallet.drongo.wallet.Keystore;
+import com.sparrowwallet.drongo.wallet.Wallet;
 import org.junit.Assert;
 import org.junit.Test;
 
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+
 public class SpecterDIYTest extends IoTest {
     @Test
     public void testImport() throws ImportException {
@@ -21,4 +27,20 @@ public class SpecterDIYTest extends IoTest {
         Assert.assertTrue(keystore.isValid());
         Network.set(Network.MAINNET);
     }
+
+    @Test
+    public void testExport() throws ExportException, IOException {
+        OutputDescriptor walletDescriptor = OutputDescriptor.getOutputDescriptor("wsh(sortedmulti(2,[7fd1bbf4/48h/0h/0h/2h]xpub6DnVFCXjZKhSAJw1oGzksdc1CtMxHxqG6DgNSjZHsymMSgcNEb2c3bz5N2bBMEEUFos98CeAWbh1pTMBcJrsKW63icdAQNGT6Aqv1WWrkxg,[8ff26349/48h/0h/0h/2h]xpub6ErPooPdSeBoXVZocBe8EWF9GXjFuV52kme35p4MtrP2SAFdUmgTJM1urrJzSuA44izrEuiQNNdmWEVRaBJcBDcPpnLBR8tP2Pcu2EiyeHu,[ff3305c2/48h/0h/0h/2h]xpub6Dpndp2xurqbfSGhxKVXzk3nJZgah3PdD3qD11KyPicYYBatRxfxqoN7s9tnWKXaz7zhyVqcvnJyak7BVKonW2wTXHd1zNDxJAu8jcxF59j))");
+        Wallet wallet = walletDescriptor.toWallet();
+        wallet.setName("Sparrow Multisig");
+
+        SpecterDIY specterDIY = new SpecterDIY();
+        byte[] walletBytes = ByteStreams.toByteArray(getInputStream("specter-diy-export.txt"));
+        ByteArrayOutputStream baos = new ByteArrayOutputStream();
+        specterDIY.exportWallet(wallet, baos);
+        String original = new String(walletBytes);
+        String exported = new String(baos.toByteArray());
+
+        Assert.assertEquals(original, exported);
+    }
 }

src/test/resources/com/sparrowwallet/sparrow/io/specter-diy-export.txt

@@ -0,0 +1 @@
+addwallet Sparrow Multisig&wsh(sortedmulti(2,[7fd1bbf4/48h/0h/0h/2h]xpub6DnVFCXjZKhSAJw1oGzksdc1CtMxHxqG6DgNSjZHsymMSgcNEb2c3bz5N2bBMEEUFos98CeAWbh1pTMBcJrsKW63icdAQNGT6Aqv1WWrkxg,[8ff26349/48h/0h/0h/2h]xpub6ErPooPdSeBoXVZocBe8EWF9GXjFuV52kme35p4MtrP2SAFdUmgTJM1urrJzSuA44izrEuiQNNdmWEVRaBJcBDcPpnLBR8tP2Pcu2EiyeHu,[ff3305c2/48h/0h/0h/2h]xpub6Dpndp2xurqbfSGhxKVXzk3nJZgah3PdD3qD11KyPicYYBatRxfxqoN7s9tnWKXaz7zhyVqcvnJyak7BVKonW2wTXHd1zNDxJAu8jcxF59j))