feat(plugins): allow to use .zip as plugin artifact (with jars inside)

jadx-core/src/main/java/jadx/core/utils/files/FileUtils.java

@@ -27,6 +27,7 @@ import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.List;
+import java.util.function.Predicate;
 import java.util.jar.JarEntry;
 import java.util.jar.JarOutputStream;
 import java.util.stream.Collectors;
@@ -78,6 +79,22 @@ public class FileUtils {
 		}
 	}
 
+	public static List<Path> listFiles(Path dir) {
+		try (Stream<Path> files = Files.list(dir)) {
+			return files.collect(Collectors.toList());
+		} catch (IOException e) {
+			throw new JadxRuntimeException("Failed to list files in directory: " + dir, e);
+		}
+	}
+
+	public static List<Path> listFiles(Path dir, Predicate<? super Path> filter) {
+		try (Stream<Path> files = Files.list(dir)) {
+			return files.filter(filter).collect(Collectors.toList());
+		} catch (IOException e) {
+			throw new JadxRuntimeException("Failed to list files in directory: " + dir, e);
+		}
+	}
+
 	public static List<Path> expandDirs(List<Path> paths) {
 		List<Path> files = new ArrayList<>(paths.size());
 		for (Path path : paths) {
@@ -148,6 +165,10 @@ public class FileUtils {
 		return true;
 	}
 
+	public static void deleteDir(Path dir) {
+		deleteDir(dir, false);
+	}
+
 	public static void deleteDirIfExists(Path dir) {
 		if (Files.exists(dir)) {
 			try {
@@ -158,10 +179,6 @@ public class FileUtils {
 		}
 	}
 
-	private static void deleteDir(Path dir) {
-		deleteDir(dir, false);
-	}
-
 	private static void deleteDir(Path dir, boolean keepRootDir) {
 		try {
 			List<Path> files = new ArrayList<>();
@@ -424,6 +441,11 @@ public class FileUtils {
 		return fileName.substring(0, extEndIndex);
 	}
 
+	public static boolean hasExtension(Path path, String extension) {
+		String fileName = path.getFileName().toString();
+		return fileName.toLowerCase().endsWith(extension);
+	}
+
 	public static File toFile(String path) {
 		if (path == null) {
 			return null;