Remove unused dependencies, Optional QR code feature

bom/pom.xml

@@ -49,15 +49,11 @@
 
 	<dependencyManagement>
 		<dependencies>
-			<dependency>
-				<groupId>net.harawata</groupId>
-				<artifactId>appdirs</artifactId>
-				<version>1.2.1</version>
-			</dependency>
 			<dependency>
 				<groupId>com.google.zxing</groupId>
 				<artifactId>core</artifactId>
 				<version>3.5.0</version>
+				<optional>true</optional>
 			</dependency>
 			<dependency>
 				<groupId>it.tdlight</groupId>

example/pom.xml

@@ -26,7 +26,7 @@
 			<dependency>
 				<groupId>it.tdlight</groupId>
 				<artifactId>tdlight-java-bom</artifactId>
-				<version>2.8.9.4</version>
+				<version>2.8.10.0</version>
 				<type>pom</type>
 				<scope>import</scope>
 			</dependency>

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

@@ -8,7 +8,7 @@ import com.google.zxing.common.BitMatrix;
 import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
 import java.util.Hashtable;
 
-class QrCodeTerminal {
+public class QrCodeTerminal {
 
 	public static String getQr(String url) {
 		int width = 40;
@@ -24,7 +24,7 @@ class QrCodeTerminal {
 		}
 	}
 
-	public static String toAscii(BitMatrix bitMatrix) {
+	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++) {

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

@@ -4,9 +4,13 @@ import it.tdlight.common.utils.ScannerUtils;
 import it.tdlight.jni.TdApi.TermsOfService;
 import java.util.concurrent.ExecutorService;
 import java.util.function.Consumer;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 final class ScannerClientInteraction implements ClientInteraction {
 
+	private static final Logger LOG = LoggerFactory.getLogger(ScannerClientInteraction.class);
+
 	private final ExecutorService blockingExecutor;
 	private final Authenticable authenticable;
 
@@ -83,8 +87,13 @@ final class ScannerClientInteraction implements ClientInteraction {
 						String link = ((ParameterInfoNotifyLink) parameterInfo).getLink();
 						System.out.println("Please confirm this login link on another device: " + link);
 						System.out.println();
+						try {
 							System.out.println(QrCodeTerminal.getQr(link));
 							System.out.println();
+						} catch (NoClassDefFoundError ex) {
+							LOG.warn("QR code library is missing!"
+									+ " Please add the following dependency to your project: com.google.zxing:core");
+						}
 						resultCons.accept("");
 						return;
 					case TERMS_OF_SERVICE:

src/main/java/module-info.java

@@ -2,7 +2,7 @@ module tdlight.java {
 	requires tdlight.api;
 	requires org.reactivestreams;
 	requires org.slf4j;
-	requires com.google.zxing;
+	requires static com.google.zxing;
 	exports it.tdlight.tdlight;
 	exports it.tdlight.tdnative;
 	exports it.tdlight.tdlib;

tdlib/pom.xml

@@ -60,13 +60,10 @@
 			<artifactId>reactive-streams</artifactId>
 			<version>1.0.3</version>
 		</dependency>
-		<dependency>
-			<groupId>net.harawata</groupId>
-			<artifactId>appdirs</artifactId>
-		</dependency>
 		<dependency>
 			<groupId>com.google.zxing</groupId>
 			<artifactId>core</artifactId>
+			<optional>true</optional>
 		</dependency>
 		<dependency>
 			<groupId>org.junit.jupiter</groupId>

tdlight-java-8/pom.xml

@@ -58,13 +58,10 @@
 			<artifactId>reactive-streams</artifactId>
 			<version>1.0.4</version>
 		</dependency>
-		<dependency>
-			<groupId>net.harawata</groupId>
-			<artifactId>appdirs</artifactId>
-		</dependency>
 		<dependency>
 			<groupId>com.google.zxing</groupId>
 			<artifactId>core</artifactId>
+			<optional>true</optional>
 		</dependency>
 		<dependency>
 			<groupId>org.junit.jupiter</groupId>

tdlight-java/pom.xml

@@ -58,13 +58,10 @@
 			<artifactId>reactive-streams</artifactId>
 			<version>1.0.4</version>
 		</dependency>
-		<dependency>
-			<groupId>net.harawata</groupId>
-			<artifactId>appdirs</artifactId>
-		</dependency>
 		<dependency>
 			<groupId>com.google.zxing</groupId>
 			<artifactId>core</artifactId>
+			<optional>true</optional>
 		</dependency>
 		<dependency>
 			<groupId>org.junit.jupiter</groupId>