Show QR code into the console

example/pom.xml

@@ -25,7 +25,7 @@
     <dependency>
       <groupId>it.tdlight</groupId>
       <artifactId>tdlight-java</artifactId>
-      <version>2.7.8.3</version>
+      <version>2.7.8.6</version>
     </dependency>
 
     <!-- TDLight natives -->

src/main/java/it/tdlight/client/QrCodeTerminal.java

@@ -0,0 +1,38 @@
+package it.tdlight.client;
+
+import com.google.zxing.BarcodeFormat;
+import com.google.zxing.EncodeHintType;
+import com.google.zxing.MultiFormatWriter;
+import com.google.zxing.WriterException;
+import com.google.zxing.common.BitMatrix;
+import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
+import java.util.Hashtable;
+
+class QrCodeTerminal {
+
+	public static String getQr(String url) {
+		int width = 40;
+		int height = 40;
+		Hashtable<EncodeHintType, Object> qrParam = new Hashtable<>();
+		qrParam.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L);
+		qrParam.put(EncodeHintType.CHARACTER_SET, "utf-8");
+		try {
+			BitMatrix bitMatrix = new MultiFormatWriter().encode(url, BarcodeFormat.QR_CODE, width, height, qrParam);
+			return toAscii(bitMatrix);
+		} catch (WriterException ex) {
+			throw new IllegalStateException("Can't encode QR code", ex);
+		}
+	}
+
+	public static String toAscii(BitMatrix bitMatrix) {
+		StringBuilder sb = new StringBuilder();
+		for (int rows = 0; rows < bitMatrix.getHeight(); rows++) {
+			for (int cols = 0; cols < bitMatrix.getWidth(); cols++) {
+				boolean x = bitMatrix.get(rows, cols);
+				sb.append(x ? "  " : "██");
+			}
+			sb.append("\n");
+		}
+		return sb.toString();
+	}
+}

src/main/java/it/tdlight/client/ScannerClientInteraction.java

@@ -62,8 +62,11 @@ final class ScannerClientInteraction implements ClientInteraction {
 				System.out.println(passwordMessage);
 				break;
 			case NOTIFY_LINK:
-				System.out.println("Please confirm this login link on another device: "
-						+ ((ParameterInfoNotifyLink) parameterInfo).getLink());
+				String link = ((ParameterInfoNotifyLink) parameterInfo).getLink();
+				System.out.println("Please confirm this login link on another device: " + link);
+				System.out.println();
+				System.out.println(QrCodeTerminal.getQr(link));
+				System.out.println();
 				return "";
 			case TERMS_OF_SERVICE:
 				TermsOfService tos = ((ParameterInfoTermsOfService) parameterInfo).getTermsOfService();

src/main/java/module-info.java

@@ -3,6 +3,7 @@ module tdlight.java {
 	requires org.reactivestreams;
 	requires org.slf4j;
 	requires it.unimi.dsi.fastutil;
+	requires com.google.zxing;
 	exports it.tdlight.tdlight;
 	exports it.tdlight.tdnative;
 	exports it.tdlight.tdlib;

tdlib/pom.xml

@@ -68,6 +68,10 @@
     <dependency>
       <groupId>net.harawata</groupId>
       <artifactId>appdirs</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>com.google.zxing</groupId>
+      <artifactId>core</artifactId>
     </dependency>
 	</dependencies>
 	<dependencyManagement>
@@ -81,6 +85,11 @@
         <groupId>net.harawata</groupId>
         <artifactId>appdirs</artifactId>
         <version>1.2.1</version>
+      </dependency>
+      <dependency>
+        <groupId>com.google.zxing</groupId>
+        <artifactId>core</artifactId>
+        <version>3.4.1</version>
       </dependency>
 		</dependencies>
   </dependencyManagement>

tdlight/pom.xml

@@ -69,7 +69,11 @@
       <groupId>net.harawata</groupId>
       <artifactId>appdirs</artifactId>
     </dependency>
-	</dependencies>
+    <dependency>
+      <groupId>com.google.zxing</groupId>
+      <artifactId>core</artifactId>
+    </dependency>
+  </dependencies>
 	<dependencyManagement>
 		<dependencies>
 			<dependency>
@@ -81,6 +85,11 @@
         <groupId>net.harawata</groupId>
         <artifactId>appdirs</artifactId>
         <version>1.2.1</version>
+      </dependency>
+      <dependency>
+        <groupId>com.google.zxing</groupId>
+        <artifactId>core</artifactId>
+        <version>3.4.1</version>
       </dependency>
 		</dependencies>
 	</dependencyManagement>