Specify User Agent

Author: Lassebq

src/main/java/org/mcphackers/mcp/tools/FileUtil.java

@@ -5,6 +5,7 @@
 import java.io.IOException;
 import java.io.InputStream;
 import java.net.URL;
+import java.net.URLConnection;
 import java.nio.channels.Channels;
 import java.nio.channels.FileChannel;
 import java.nio.channels.ReadableByteChannel;
@@ -30,6 +31,8 @@
 import java.util.zip.ZipInputStream;
 import java.util.zip.ZipOutputStream;
 
+import org.mcphackers.mcp.MCP;
+
 public abstract class FileUtil {
 
 	public static void delete(Path path) throws IOException {
@@ -131,13 +134,19 @@ public static void downloadFile(String url, Path output) throws IOException {
 	}
 
 	public static void downloadFile(URL url, Path output) throws IOException {
-		ReadableByteChannel channel = Channels.newChannel(url.openStream());
+		ReadableByteChannel channel = Channels.newChannel(openURLStream(url));
 		try (FileOutputStream stream = new FileOutputStream(output.toAbsolutePath().toString())) {
 			FileChannel fileChannel = stream.getChannel();
 			fileChannel.transferFrom(channel, 0, Long.MAX_VALUE);
 		}
 	}
 
+	public static InputStream openURLStream(URL url) throws IOException {
+		URLConnection connection = url.openConnection();
+		connection.setRequestProperty("User-Agent", "RetroMCP/" + MCP.VERSION);
+		return connection.getInputStream();
+	}
+
 	public static void deleteDirectoryIfExists(Path path) throws IOException {
 		if (Files.isDirectory(path)) {
 			deleteDirectory(path);

src/main/java/org/mcphackers/mcp/tools/versions/DownloadData.java

@@ -47,7 +47,7 @@ public DownloadData(Path libraries, Path gameDir, Path client, Path server, Vers
 			Path assetIndex = gameDir.resolve("assets/indexes/" + version.assets + ".json");
 			String assetIndexString;
 			if (!Files.exists(assetIndex) || !version.assetIndex.sha1.equals(Util.getSHA1(assetIndex))) {
-				assetIndexString = new String(Util.readAllBytes(new URL(version.assetIndex.url).openStream()));
+				assetIndexString = new String(Util.readAllBytes(FileUtil.openURLStream(new URL(version.assetIndex.url))));
 				Files.write(assetIndex, assetIndexString.getBytes());
 			} else {
 				assetIndexString = new String(Files.readAllBytes(assetIndex));