From 0c650bf14634f19673a40927e2c219d46846cfa0 Mon Sep 17 00:00:00 2001
From: huynguyennovem <huynguyennovem@gmail.com>
Date: Sun, 7 May 2023 12:38:18 +0700
Subject: [PATCH] Fixes #56: Can not host non-media files on Android 11 and
 above

Signed-off-by: huynguyennovem <huynguyennovem@gmail.com>
---
 android/app/src/main/AndroidManifest.xml |  2 ++
 lib/ui/server/server_widget.dart         | 15 +++++++++
 lib/util/utility_functions.dart          | 39 ++++++++++++++++++++++++
 3 files changed, 56 insertions(+)

diff --git a/android/app/src/main/AndroidManifest.xml b/android/app/src/main/AndroidManifest.xml
index 26ffe81..81a1316 100644
--- a/android/app/src/main/AndroidManifest.xml
+++ b/android/app/src/main/AndroidManifest.xml
@@ -7,6 +7,8 @@
     <!--flutter_downloader-->
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" android:maxSdkVersion="28" />
 
+    <uses-permission android:name="android.permission.MANAGE_EXTERNAL_STORAGE"/>
+
     <application
         android:label="NetShare"
         android:name="${applicationName}"
diff --git a/lib/ui/server/server_widget.dart b/lib/ui/server/server_widget.dart
index ee12908..84ca459 100644
--- a/lib/ui/server/server_widget.dart
+++ b/lib/ui/server/server_widget.dart
@@ -370,6 +370,21 @@ class _ServerWidgetState extends State<ServerWidget> {
       return;
     }
 
+    // Additional check for Android limitation (Android 11 and above,
+    // see: https://developer.android.com/training/data-storage/manage-all-files#all-files-access-google-play)
+    final needGrantPermission = await UtilityFunctions.isNeedAccessAllFileStoragePermission;
+    if(needGrantPermission) {
+      final isPermissionGranted = await UtilityFunctions.checkManageExternalStoragePermission(
+        onPermanentlyDenied: () => context.showOpenSettingsDialog(),
+      );
+      if (!isPermissionGranted) {
+        if (mounted) {
+          context.showSnackbar('Need storage permission to continue');
+        }
+        return;
+      }
+    }
+
     // Router instance to handler requests.
     // Use shelf_router.Router(notFoundHandler: _staticHandler(dir.path))
     // as a fallback for static handler (may use this later)
diff --git a/lib/util/utility_functions.dart b/lib/util/utility_functions.dart
index 144b68e..71b61a9 100644
--- a/lib/util/utility_functions.dart
+++ b/lib/util/utility_functions.dart
@@ -83,6 +83,37 @@ class UtilityFunctions {
     }
   }
 
+  static Future<bool> checkManageExternalStoragePermission({
+    Function? onGranted,
+    Function? onDenied,
+    Function? onPermanentlyDenied,
+  }) async {
+    final status = await Permission.manageExternalStorage.status;
+    switch (status) {
+      case PermissionStatus.granted:
+        onGranted?.call();
+        return true;
+      case PermissionStatus.permanentlyDenied:
+        onPermanentlyDenied?.call();
+        return false;
+      default:
+        {
+          final requested = await Permission.manageExternalStorage.request();
+          switch (requested) {
+            case PermissionStatus.granted:
+              onGranted?.call();
+              return true;
+            case PermissionStatus.permanentlyDenied:
+              onPermanentlyDenied?.call();
+              return false;
+            default:
+              onDenied?.call();
+              return false;
+          }
+        }
+    }
+  }
+
   static Future<int> get androidSDKVersion async {
     DeviceInfoPlugin deviceInfoPlugin = DeviceInfoPlugin();
     final androidInfo = await deviceInfoPlugin.androidInfo;
@@ -97,6 +128,14 @@ class UtilityFunctions {
     return 28 >= sdkVersion;
   }
 
+  static Future<bool> get isNeedAccessAllFileStoragePermission async {
+    if (!Platform.isAndroid) {
+      return false;
+    }
+    final sdkVersion = await androidSDKVersion;
+    return 30 <= sdkVersion;
+  }
+
   /// Parse ip (v4) address with [rawInput] which has format:
   /// ip:port (eg: 192.168.0.100:8080)
   static Tuple2<String, int> parseIPAddress(String rawInput) {