Implement hasPermissions API (#201)

* Implement hasPermissions api

* Bump minimum MacOS version to 10.15

* Apply suggestions from code review

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

lib/src/universal_ble.dart

@@ -71,6 +71,18 @@ class UniversalBle {
     );
   }
 
+  /// Check if has permissions.
+  /// [withAndroidFineLocation] is used to check fine location permission on Android 12+ (API 31+).
+  /// On Android lower than 12, this method will check location permission regardless of the [withAndroidFineLocation] value.
+  /// `Windows`, `Linux` and `Web` will always return true.
+  static Future<bool> hasPermissions({
+    bool withAndroidFineLocation = false,
+  }) async {
+    return _platform.hasPermissions(
+      withAndroidFineLocation: withAndroidFineLocation,
+    );
+  }
+
   /// Request permissions.
   /// if all permissions are already granted or granted by user, this method will succeed.
   /// it will throw exception if permissions are denied by user.

lib/src/universal_ble_linux/universal_ble_linux.dart

@@ -431,12 +431,6 @@ class UniversalBleLinux extends UniversalBlePlatform {
         .toList();
   }
 
-  @override
-  Future<void> requestPermissions(
-      {bool withAndroidFineLocation = false}) async {
-    // No permissions to request on linux
-  }
-
   AvailabilityState get _availabilityState {
     return _activeAdapter?.powered == true
         ? AvailabilityState.poweredOn

lib/src/universal_ble_pigeon/universal_ble.g.dart

@@ -592,6 +592,35 @@ class UniversalBlePlatformChannel {
     }
   }
 
+  Future<bool> hasPermissions(bool withAndroidFineLocation) async {
+    final pigeonVar_channelName =
+        'dev.flutter.pigeon.universal_ble.UniversalBlePlatformChannel.hasPermissions$pigeonVar_messageChannelSuffix';
+    final pigeonVar_channel = BasicMessageChannel<Object?>(
+      pigeonVar_channelName,
+      pigeonChannelCodec,
+      binaryMessenger: pigeonVar_binaryMessenger,
+    );
+    final Future<Object?> pigeonVar_sendFuture =
+        pigeonVar_channel.send(<Object?>[withAndroidFineLocation]);
+    final pigeonVar_replyList = await pigeonVar_sendFuture as List<Object?>?;
+    if (pigeonVar_replyList == null) {
+      throw _createConnectionError(pigeonVar_channelName);
+    } else if (pigeonVar_replyList.length > 1) {
+      throw PlatformException(
+        code: pigeonVar_replyList[0]! as String,
+        message: pigeonVar_replyList[1] as String?,
+        details: pigeonVar_replyList[2],
+      );
+    } else if (pigeonVar_replyList[0] == null) {
+      throw PlatformException(
+        code: 'null-error',
+        message: 'Host platform returned null value for non-null return value.',
+      );
+    } else {
+      return (pigeonVar_replyList[0] as bool?)!;
+    }
+  }
+
   Future<void> requestPermissions(bool withAndroidFineLocation) async {
     final pigeonVar_channelName =
         'dev.flutter.pigeon.universal_ble.UniversalBlePlatformChannel.requestPermissions$pigeonVar_messageChannelSuffix';

lib/src/universal_ble_pigeon/universal_ble_pigeon_channel.dart

@@ -145,6 +145,13 @@ class UniversalBlePigeonChannel extends UniversalBlePlatform {
   Future<void> unpair(String deviceId) =>
       _executeWithErrorHandling(() => _channel.unPair(deviceId));
 
+  @override
+  Future<bool> hasPermissions({bool withAndroidFineLocation = false}) async {
+    return await _executeWithErrorHandling(
+      () => _channel.hasPermissions(withAndroidFineLocation),
+    );
+  }
+
   @override
   Future<void> requestPermissions(
       {bool withAndroidFineLocation = false}) async {

lib/src/universal_ble_platform_interface.dart

@@ -37,7 +37,12 @@ abstract class UniversalBlePlatform {
 
   Future<bool> disableBluetooth();
 
-  Future<void> requestPermissions({bool withAndroidFineLocation = false});
+  Future<bool> hasPermissions({bool withAndroidFineLocation = false}) async {
+    return true;
+  }
+
+  Future<void> requestPermissions(
+      {bool withAndroidFineLocation = false}) async {}
 
   Future<void> startScan({
     ScanFilter? scanFilter,

lib/src/universal_ble_web/universal_ble_web.dart

@@ -275,12 +275,6 @@ class UniversalBleWeb extends UniversalBlePlatform {
   }
 
   /// `Unimplemented`
-  @override
-  Future<void> requestPermissions(
-      {bool withAndroidFineLocation = false}) async {
-    // No permissions to request on Web
-  }
-
   @override
   Future<int> requestMtu(String deviceId, int expectedMtu) {
     throw UniversalBleException(