Fix file uploading

app/src/main/java/dev/vendicated/vencord/MainActivity.java

@@ -1,18 +1,23 @@
 package dev.vendicated.vencord;
 
-import androidx.annotation.NonNull;
-
 import android.annotation.SuppressLint;
 import android.app.Activity;
+import android.content.Intent;
+import android.net.Uri;
 import android.os.Bundle;
 import android.os.StrictMode;
+import android.view.KeyEvent;
+import android.webkit.ValueCallback;
 import android.webkit.WebView;
 
 import java.io.IOException;
 
 public class MainActivity extends Activity {
+    public static final int FILECHOOSER_RESULTCODE = 8485;
     private WebView wv;
 
+    public ValueCallback<Uri[]> filePathCallback;
+
     @SuppressLint("SetJavaScriptEnabled") // mad? watch this swag
     @Override
     protected void onCreate(Bundle savedInstanceState) {
@@ -28,7 +33,7 @@ public class MainActivity extends Activity {
         explodeAndroid();
 
         wv.setWebViewClient(new VWebviewClient());
-        wv.setWebChromeClient(new VChromeClient());
+        wv.setWebChromeClient(new VChromeClient(this));
 
         var s = wv.getSettings();
         s.setJavaScriptEnabled(true);
@@ -42,20 +47,45 @@ public class MainActivity extends Activity {
             return;
         }
 
-        if (savedInstanceState == null)
-            wv.loadUrl("https://discord.com/app");
+        wv.loadUrl("https://discord.com/app");
     }
 
     @Override
-    protected void onSaveInstanceState(@NonNull Bundle state) {
-        super.onSaveInstanceState(state);
-        wv.saveState(state);
+    public boolean onKeyDown(int keyCode, KeyEvent event) {
+        if (keyCode == KeyEvent.KEYCODE_BACK && wv != null && wv.canGoBack()) {
+            wv.goBack();
+            return true;
+        }
+        return super.onKeyDown(keyCode, event);
     }
 
     @Override
-    protected void onRestoreInstanceState(Bundle state) {
-        super.onRestoreInstanceState(state);
-        wv.restoreState(state);
+    protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
+        if (requestCode != FILECHOOSER_RESULTCODE || filePathCallback == null)
+            return;
+
+        if (resultCode != RESULT_OK || intent == null) {
+            filePathCallback.onReceiveValue(null);
+            return;
+        } else {
+            Uri[] uris;
+            try {
+                var clipData = intent.getClipData();
+                if (clipData != null) { // multiple items
+                    uris = new Uri[clipData.getItemCount()];
+                    for (int i = 0; i < clipData.getItemCount(); i++) {
+                        uris[i] = clipData.getItemAt(i).getUri();
+                    }
+                } else { // single item
+                    uris = new Uri[] { intent.getData() };
+                }
+            } catch (Exception ex) {
+                Logger.e("Error during file upload", ex);
+                uris = null;
+            }
+            filePathCallback.onReceiveValue(uris);
+        }
+        filePathCallback = null;
     }
 
     private void explodeAndroid() {

app/src/main/java/dev/vendicated/vencord/VChromeClient.java

@@ -1,11 +1,19 @@
 package dev.vendicated.vencord;
 
-import android.webkit.ConsoleMessage;
-import android.webkit.WebChromeClient;
+import android.app.Activity;
+import android.content.ActivityNotFoundException;
+import android.net.Uri;
+import android.webkit.*;
 
 import java.util.Locale;
 
 public class VChromeClient extends WebChromeClient {
+    private final MainActivity activity;
+
+    public VChromeClient(MainActivity activity) {
+        this.activity = activity;
+    }
+
     @Override
     public boolean onConsoleMessage(ConsoleMessage msg) {
         var m = String.format(Locale.ENGLISH, "[Javascript] %s @ %d: %s", msg.message(), msg.lineNumber(), msg.sourceId());
@@ -25,4 +33,22 @@ public class VChromeClient extends WebChromeClient {
         }
         return true;
     }
+
+    @Override
+    public boolean onShowFileChooser(WebView webView, ValueCallback<Uri[]> filePathCallback, FileChooserParams fileChooserParams) {
+        if (activity.filePathCallback != null)
+            activity.filePathCallback.onReceiveValue(null);
+
+        activity.filePathCallback = filePathCallback;
+
+        var i = fileChooserParams.createIntent();
+        try {
+            activity.startActivityForResult(i, MainActivity.FILECHOOSER_RESULTCODE);
+        } catch (ActivityNotFoundException ex) {
+            activity.filePathCallback = null;
+            return false;
+        }
+
+        return true;
+    }
 }