fix: improve resource type detection and remove deprecated method

jadx-core/src/main/java/jadx/api/ResourceType.java

@@ -1,14 +1,20 @@
 package jadx.api;
 
+import java.util.HashMap;
+import java.util.Locale;
+import java.util.Map;
+
+import jadx.core.utils.exceptions.JadxRuntimeException;
+
 public enum ResourceType {
 	CODE(".dex", ".jar", ".class"),
-	MANIFEST("AndroidManifest.xml"),
 	XML(".xml"),
 	ARSC(".arsc"),
 	FONT(".ttf", ".otf"),
 	IMG(".png", ".gif", ".jpg"),
 	MEDIA(".mp3", ".wav"),
 	LIB(".so"),
+	MANIFEST,
 	UNKNOWN;
 
 	private final String[] exts;
@@ -21,14 +27,31 @@ public enum ResourceType {
 		return exts;
 	}
 
-	public static ResourceType getFileType(String fileName) {
+	private static final Map<String, ResourceType> EXT_MAP = new HashMap<>();
+
+	static {
 		for (ResourceType type : ResourceType.values()) {
 			for (String ext : type.getExts()) {
-				if (fileName.toLowerCase().endsWith(ext)) {
-					return type;
+				ResourceType prev = EXT_MAP.put(ext, type);
+				if (prev != null) {
+					throw new JadxRuntimeException("Duplicate extension in ResourceType: " + ext);
 				}
 			}
 		}
+	}
+
+	public static ResourceType getFileType(String fileName) {
+		int dot = fileName.lastIndexOf('.');
+		if (dot != -1) {
+			String ext = fileName.substring(dot).toLowerCase(Locale.ROOT);
+			ResourceType resType = EXT_MAP.get(ext);
+			if (resType != null) {
+				if (resType == XML && fileName.equals("AndroidManifest.xml")) {
+					return MANIFEST;
+				}
+				return resType;
+			}
+		}
 		return UNKNOWN;
 	}
 }

jadx-gui/src/main/java/jadx/gui/JadxWrapper.java

@@ -143,11 +143,6 @@ public class JadxWrapper {
 		return decompiler.getResources();
 	}
 
-	@Deprecated
-	public File getOpenFile() {
-		return openPaths.get(0).toFile();
-	}
-
 	public List<Path> getOpenPaths() {
 		return openPaths;
 	}

jadx-gui/src/main/java/jadx/gui/treemodel/ApkSignature.java

@@ -15,6 +15,8 @@ import org.slf4j.LoggerFactory;
 
 import com.android.apksig.ApkVerifier;
 
+import jadx.api.ResourceFile;
+import jadx.api.ResourceType;
 import jadx.gui.JadxWrapper;
 import jadx.gui.utils.CertificateManager;
 import jadx.gui.utils.NLS;
@@ -33,11 +35,20 @@ public class ApkSignature extends JNode {
 	public static ApkSignature getApkSignature(JadxWrapper wrapper) {
 		// Only show the ApkSignature node if an AndroidManifest.xml is present.
 		// Without a manifest the Google ApkVerifier refuses to work.
-		if (wrapper.getResources().stream().noneMatch(r -> "AndroidManifest.xml".equals(r.getOriginalName()))) {
+		File apkFile = null;
+		for (ResourceFile resFile : wrapper.getResources()) {
+			if (resFile.getType() == ResourceType.MANIFEST) {
+				ResourceFile.ZipRef zipRef = resFile.getZipRef();
+				if (zipRef != null) {
+					apkFile = zipRef.getZipFile();
+					break;
+				}
+			}
+		}
+		if (apkFile == null) {
 			return null;
 		}
-		File openFile = wrapper.getOpenFile();
-		return new ApkSignature(openFile);
+		return new ApkSignature(apkFile);
 	}
 
 	public ApkSignature(File openFile) {