add user agent for browsing

Author: carlosuc3m

src/main/java/io/bioimage/modelrunner/bioimageio/download/DownloadModel.java

@@ -48,6 +48,8 @@
 import io.bioimage.modelrunner.bioimageio.description.weights.WeightFormat;
 import io.bioimage.modelrunner.engine.EngineInfo;
 import io.bioimage.modelrunner.engine.installation.FileDownloader;
+import io.bioimage.modelrunner.system.PlatformDetection;
+import io.bioimage.modelrunner.utils.CommonUtils;
 import io.bioimage.modelrunner.utils.Constants;
 import io.bioimage.modelrunner.utils.ZipUtils;
 
@@ -592,6 +594,7 @@ public static long getFileSize(URL url) {
 		HttpURLConnection conn = null;
 		try {
 			conn = (HttpURLConnection) url.openConnection();
+			conn.setRequestProperty("User-Agent", CommonUtils.getJDLLUserAgent());
 			if (conn.getResponseCode() >= 300 && conn.getResponseCode() <= 308)
 				return getFileSize(redirectedURL(url));
 			if (conn.getResponseCode() != 200)
@@ -676,6 +679,7 @@ public static URL redirectedURL(URL url) throws MalformedURLException, URISyntax
 		HttpURLConnection conn;
 		try {
 			conn = (HttpURLConnection) url.openConnection();
+			conn.setRequestProperty("User-Agent", CommonUtils.getJDLLUserAgent());
 			statusCode = conn.getResponseCode();
 		} catch (IOException ex) {
 			return url;

src/main/java/io/bioimage/modelrunner/utils/CommonUtils.java

@@ -25,6 +25,7 @@
 import java.text.SimpleDateFormat;
 import java.util.Calendar;
 
+import io.bioimage.modelrunner.system.PlatformDetection;
 import net.imglib2.RandomAccessibleInterval;
 import net.imglib2.type.NativeType;
 import net.imglib2.type.numeric.RealType;
@@ -46,6 +47,8 @@
  */
 public class CommonUtils {
 
+	private static String USER_AGENT;
+	
 	public static Calendar cal;
 
 	/**
@@ -161,4 +164,23 @@ public static boolean int64Overflows(long[] arr) {
 	public static void main(String[] args) {
 		System.out.println(getTime());
 	}
+	
+	/**
+	 * Create a user agent for browsing
+	 * @return the user agent
+	 */
+	public static String getJDLLUserAgent() {
+		if (USER_AGENT != null)
+			return USER_AGENT;
+		String os = "Unknown";
+		if (PlatformDetection.isWindows()) {
+			os = "Windows";
+		} else if (PlatformDetection.isLinux()) {
+			os = "Linux";
+		} else if (PlatformDetection.isMacOS()) {
+			os = "MacOS";
+		}
+		USER_AGENT = "JDLL/0.5.0(" + os + "; Java " + PlatformDetection.getJavaVersion();
+		return USER_AGENT;
+	}
 }