terminal - show receive address as qr code

src/main/java/com/sparrowwallet/sparrow/terminal/wallet/QRCodeDialog.java

@@ -0,0 +1,38 @@
+package com.sparrowwallet.sparrow.terminal.wallet;
+
+import com.google.zxing.BarcodeFormat;
+import com.google.zxing.EncodeHintType;
+import com.google.zxing.WriterException;
+import com.google.zxing.common.BitMatrix;
+import com.google.zxing.qrcode.QRCodeWriter;
+import com.googlecode.lanterna.gui2.*;
+import com.googlecode.lanterna.gui2.dialogs.DialogWindow;
+import com.googlecode.lanterna.input.KeyStroke;
+
+import java.util.List;
+import java.util.Map;
+
+public class QRCodeDialog extends DialogWindow {
+    public QRCodeDialog(String data) throws WriterException {
+        super(data);
+
+        setHints(List.of(Hint.CENTERED));
+
+        Panel mainPanel = new Panel(new GridLayout(1).setLeftMarginSize(1).setRightMarginSize(1).setTopMarginSize(1));
+
+        QRCodeWriter qrCodeWriter = new QRCodeWriter();
+        BitMatrix qrMatrix = qrCodeWriter.encode(data, BarcodeFormat.QR_CODE, 33, 33, Map.of(EncodeHintType.MARGIN, 0));
+
+        ImageComponent imageComponent = new ImageComponent();
+        imageComponent.setTextImage(new QRTextImage(qrMatrix));
+        mainPanel.addComponent(imageComponent);
+
+        setComponent(mainPanel);
+    }
+
+    @Override
+    public boolean handleInput(KeyStroke key) {
+        close();
+        return true;
+    }
+}

src/main/java/com/sparrowwallet/sparrow/terminal/wallet/QRTextImage.java

@@ -0,0 +1,93 @@
+package com.sparrowwallet.sparrow.terminal.wallet;
+
+import com.google.zxing.common.BitMatrix;
+import com.googlecode.lanterna.*;
+import com.googlecode.lanterna.graphics.AbstractTextGraphics;
+import com.googlecode.lanterna.graphics.TextGraphics;
+import com.googlecode.lanterna.graphics.TextImage;
+
+import java.util.EnumSet;
+
+public class QRTextImage implements TextImage {
+    private final BitMatrix bitMatrix;
+    private final TerminalSize size;
+
+    private static final TextCharacter REVERSE_CHARACTER = TextCharacter.fromString(" ", TextColor.ANSI.DEFAULT, TextColor.ANSI.DEFAULT, EnumSet.of(SGR.REVERSE))[0];
+
+    public QRTextImage(BitMatrix bitMatrix) {
+        this.bitMatrix = bitMatrix;
+        this.size = new TerminalSize(bitMatrix.getWidth() * 2, bitMatrix.getHeight());
+    }
+
+    @Override
+    public TerminalSize getSize() {
+        return size;
+    }
+
+    @Override
+    public TextCharacter getCharacterAt(TerminalPosition position) {
+        return getCharacterAt(position.getColumn(), position.getRow());
+    }
+
+    @Override
+    public TextCharacter getCharacterAt(int column, int row) {
+        boolean filled = bitMatrix.get(column / 2, row);
+        return filled ? TextCharacter.DEFAULT_CHARACTER : REVERSE_CHARACTER;
+    }
+
+    @Override
+    public void setCharacterAt(TerminalPosition position, TextCharacter character) {
+        throw new UnsupportedOperationException("Cannot set character in QR Code");
+    }
+
+    @Override
+    public void setCharacterAt(int column, int row, TextCharacter character) {
+        throw new UnsupportedOperationException("Cannot set character in QR Code");
+    }
+
+    @Override
+    public void setAll(TextCharacter character) {
+        throw new UnsupportedOperationException("Cannot set character in QR Code");
+    }
+
+    @Override
+    public TextGraphics newTextGraphics() {
+        return new AbstractTextGraphics() {
+            @Override
+            public TextGraphics setCharacter(int columnIndex, int rowIndex, TextCharacter textCharacter) {
+                QRTextImage.this.setCharacterAt(columnIndex, rowIndex, textCharacter);
+                return this;
+            }
+
+            @Override
+            public TextCharacter getCharacter(int column, int row) {
+                return QRTextImage.this.getCharacterAt(column, row);
+            }
+
+            @Override
+            public TerminalSize getSize() {
+                return size;
+            }
+        };
+    }
+
+    @Override
+    public TextImage resize(TerminalSize newSize, TextCharacter filler) {
+        throw new UnsupportedOperationException("Cannot resize QR Code");
+    }
+
+    @Override
+    public void copyTo(TextImage destination) {
+        throw new UnsupportedOperationException("Cannot copy QR Code");
+    }
+
+    @Override
+    public void copyTo(TextImage destination, int startRowIndex, int rows, int startColumnIndex, int columns, int destinationRowOffset, int destinationColumnOffset) {
+        throw new UnsupportedOperationException("Cannot copy QR Code");
+    }
+
+    @Override
+    public void scrollLines(int firstLine, int lastLine, int distance) {
+        throw new UnsupportedOperationException("Cannot scroll QR Code");
+    }
+}

src/main/java/com/sparrowwallet/sparrow/terminal/wallet/ReceiveDialog.java

@@ -1,7 +1,6 @@
 package com.sparrowwallet.sparrow.terminal.wallet;
 
 import com.google.common.eventbus.Subscribe;
-import com.googlecode.lanterna.TerminalSize;
 import com.googlecode.lanterna.gui2.*;
 import com.sparrowwallet.drongo.KeyDerivation;
 import com.sparrowwallet.drongo.KeyPurpose;
@@ -14,6 +13,8 @@ import com.sparrowwallet.sparrow.terminal.SparrowTerminal;
 import com.sparrowwallet.sparrow.wallet.Function;
 import com.sparrowwallet.sparrow.wallet.NodeEntry;
 import com.sparrowwallet.sparrow.wallet.WalletForm;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.text.DateFormat;
 import java.text.SimpleDateFormat;
@@ -21,6 +22,7 @@ import java.util.List;
 import java.util.Set;
 
 public class ReceiveDialog extends WalletDialog {
+    private static final Logger log = LoggerFactory.getLogger(ReceiveDialog.class);
     private static final DateFormat DATE_FORMAT = new SimpleDateFormat("yyyy-MM-dd HH:mm");
 
     private final Label address;
@@ -50,7 +52,7 @@ public class ReceiveDialog extends WalletDialog {
         buttonPanel.addComponent(new Button("Back", () -> onBack(Function.RECEIVE)));
         buttonPanel.addComponent(new Button("Get Fresh Address", this::refreshAddress).setLayoutData(GridLayout.createLayoutData(GridLayout.Alignment.CENTER, GridLayout.Alignment.CENTER, true, false)));
 
-        mainPanel.addComponent(new EmptySpace(TerminalSize.ONE));
+        mainPanel.addComponent(new Button("Show QR", this::showQR));
 
         buttonPanel.setLayoutData(GridLayout.createLayoutData(GridLayout.Alignment.END, GridLayout.Alignment.CENTER,false,false)).addTo(mainPanel);
         setComponent(mainPanel);
@@ -58,6 +60,20 @@ public class ReceiveDialog extends WalletDialog {
         refreshAddress();
     }
 
+    public void showQR() {
+        if(currentEntry == null) {
+            return;
+        }
+
+        try {
+            QRCodeDialog qrCodeDialog = new QRCodeDialog(currentEntry.getAddress().toString());
+            qrCodeDialog.showDialog(SparrowTerminal.get().getGui());
+        } catch(Exception e) {
+            log.error("Error creating QR", e);
+            AppServices.showErrorDialog("Error creating QR", e.getMessage());
+        }
+    }
+
     public void refreshAddress() {
         SparrowTerminal.get().getGuiThread().invokeLater(() -> {
             NodeEntry freshEntry = getWalletForm().getFreshNodeEntry(KeyPurpose.RECEIVE, currentEntry);