From 058530bd905fba39f3ead09fdb98cd730267d31e Mon Sep 17 00:00:00 2001
From: Gabriel <97042217+GabrielBRDeveloper@users.noreply.github.com>
Date: Sun, 24 Dec 2023 13:19:05 -0400
Subject: [PATCH] Resolve PathUtils.java

---
 .../pandroid/app/main/GamesFragment.java      |  5 +++
 .../panda3ds/pandroid/utils/FileUtils.java    | 41 +++++++++++++++++++
 .../panda3ds/pandroid/utils/GameUtils.java    |  2 +-
 3 files changed, 47 insertions(+), 1 deletion(-)

diff --git a/src/pandroid/app/src/main/java/com/panda3ds/pandroid/app/main/GamesFragment.java b/src/pandroid/app/src/main/java/com/panda3ds/pandroid/app/main/GamesFragment.java
index c5f1acee..e2c97a17 100644
--- a/src/pandroid/app/src/main/java/com/panda3ds/pandroid/app/main/GamesFragment.java
+++ b/src/pandroid/app/src/main/java/com/panda3ds/pandroid/app/main/GamesFragment.java
@@ -5,6 +5,7 @@ import android.os.Bundle;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
+import android.widget.Toast;
 
 import androidx.activity.result.ActivityResultCallback;
 import androidx.activity.result.ActivityResultLauncher;
@@ -50,6 +51,10 @@ public class GamesFragment extends Fragment implements ActivityResultCallback<Ur
         if (result != null) {
             String uri = result.toString();
             if (GameUtils.findByRomPath(uri) == null) {
+                if (FileUtils.obtainRealPath(uri) == null){
+                    Toast.makeText(getContext(), "Invalid file path", Toast.LENGTH_LONG).show();
+                    return;
+                }
                 FileUtils.makeUriPermanent(uri, FileUtils.MODE_READ);
                 GameMetadata game = new GameMetadata(uri, FileUtils.getName(uri).split("\\.")[0],"Unknown");
                 GameUtils.addGame(game);
diff --git a/src/pandroid/app/src/main/java/com/panda3ds/pandroid/utils/FileUtils.java b/src/pandroid/app/src/main/java/com/panda3ds/pandroid/utils/FileUtils.java
index c6902c94..edab01d8 100644
--- a/src/pandroid/app/src/main/java/com/panda3ds/pandroid/utils/FileUtils.java
+++ b/src/pandroid/app/src/main/java/com/panda3ds/pandroid/utils/FileUtils.java
@@ -3,6 +3,8 @@ package com.panda3ds.pandroid.utils;
 import android.content.Context;
 import android.content.Intent;
 import android.net.Uri;
+import android.os.ParcelFileDescriptor;
+import android.system.Os;
 import android.util.Log;
 
 import androidx.documentfile.provider.DocumentFile;
@@ -15,9 +17,11 @@ import java.io.FileNotFoundException;
 import java.io.InputStream;
 import java.io.OutputStream;
 import java.nio.charset.StandardCharsets;
+import java.util.Objects;
 
 public class FileUtils {
     public static final String MODE_READ = "r";
+    public static final int CANONICAL_SEARCH_DEEP = 8;
 
     private static DocumentFile parseFile(String path) {
         if (path.startsWith("/")) {
@@ -125,4 +129,41 @@ public class FileUtils {
 
         getContext().getContentResolver().takePersistableUriPermission(Uri.parse(uri), flags);
     }
+
+    /**
+     * When call ContentProvider.openFileDescriptor() android open a file descriptor
+     * on app process in /proc/self/fd/[file descriptor id] this is a link to real file path
+     * can use File.getCanonicalPath() for get a link origin, but in some android version
+     * need use Os.readlink(path) to get a real path.
+     */
+    public static String obtainRealPath(String uri) {
+        try {
+            ParcelFileDescriptor parcelDescriptor = getContext().getContentResolver().openFileDescriptor(Uri.parse(uri), "r");
+            int fd = parcelDescriptor.getFd();
+            File file = new File("/proc/self/fd/" + fd).getAbsoluteFile();
+            for (int i = 0; i < CANONICAL_SEARCH_DEEP; i++) {
+                try {
+                    String canonical = file.getCanonicalPath();
+                    if (!Objects.equals(canonical, file.getAbsolutePath())) {
+                        file = new File(canonical).getAbsoluteFile();
+                    }
+                } catch (Exception x) {
+                    break;
+                }
+            }
+
+            if (!file.getAbsolutePath().startsWith("/proc/self/")) {
+                parcelDescriptor.close();
+                return file.getAbsolutePath();
+            }
+            String path = Os.readlink(file.getAbsolutePath());
+            parcelDescriptor.close();
+
+            if (new File(path).exists())
+                return path;
+            return null;
+        } catch (Exception e) {
+            return null;
+        }
+    }
 }
diff --git a/src/pandroid/app/src/main/java/com/panda3ds/pandroid/utils/GameUtils.java b/src/pandroid/app/src/main/java/com/panda3ds/pandroid/utils/GameUtils.java
index cb3ebb39..b763f7b2 100644
--- a/src/pandroid/app/src/main/java/com/panda3ds/pandroid/utils/GameUtils.java
+++ b/src/pandroid/app/src/main/java/com/panda3ds/pandroid/utils/GameUtils.java
@@ -40,7 +40,7 @@ public class GameUtils {
 
     public static void launch(Context context, GameMetadata game) {
         currentGame = game;
-        String path = PathUtils.getPath(Uri.parse(game.getRomPath()));
+        String path = FileUtils.obtainRealPath(game.getRomPath());
         context.startActivity(new Intent(context, GameActivity.class).putExtra(Constants.ACTIVITY_PARAMETER_PATH, path));
     }