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>

android/src/main/kotlin/com/navideck/universal_ble/PermissionHandler.kt

@@ -24,6 +24,18 @@ class PermissionHandler(
 ) {
     private var permissionRequestCallback: ((Result<Unit>) -> Unit)? = null
 
+    /**
+     * Check if we have required permissions
+     */
+    fun hasPermissions(withFineLocation: Boolean): Boolean {
+        val validationError = validateRequiredPermissions(withFineLocation)
+        if (validationError != null) {
+            throw validationError
+        }
+        val permissionsToRequest = getRequiredPermissions(withFineLocation)
+        return permissionsToRequest.isEmpty()
+    }
+
     /**
      * Requests the required Bluetooth permissions based on the manifest and Android version.
      *

android/src/main/kotlin/com/navideck/universal_ble/UniversalBle.g.kt

@@ -510,6 +510,7 @@ private open class UniversalBlePigeonCodec : StandardMessageCodec() {
  */
 interface UniversalBlePlatformChannel {
   fun getBluetoothAvailabilityState(callback: (Result<Long>) -> Unit)
+  fun hasPermissions(withAndroidFineLocation: Boolean): Boolean
   fun requestPermissions(withAndroidFineLocation: Boolean, callback: (Result<Unit>) -> Unit)
   fun enableBluetooth(callback: (Result<Boolean>) -> Unit)
   fun disableBluetooth(callback: (Result<Boolean>) -> Unit)
@@ -557,6 +558,23 @@ interface UniversalBlePlatformChannel {
           channel.setMessageHandler(null)
         }
       }
+      run {
+        val channel = BasicMessageChannel<Any?>(binaryMessenger, "dev.flutter.pigeon.universal_ble.UniversalBlePlatformChannel.hasPermissions$separatedMessageChannelSuffix", codec)
+        if (api != null) {
+          channel.setMessageHandler { message, reply ->
+            val args = message as List<Any?>
+            val withAndroidFineLocationArg = args[0] as Boolean
+            val wrapped: List<Any?> = try {
+              listOf(api.hasPermissions(withAndroidFineLocationArg))
+            } catch (exception: Throwable) {
+              UniversalBlePigeonUtils.wrapError(exception)
+            }
+            reply.reply(wrapped)
+          }
+        } else {
+          channel.setMessageHandler(null)
+        }
+      }
       run {
         val channel = BasicMessageChannel<Any?>(binaryMessenger, "dev.flutter.pigeon.universal_ble.UniversalBlePlatformChannel.requestPermissions$separatedMessageChannelSuffix", codec)
         if (api != null) {

android/src/main/kotlin/com/navideck/universal_ble/UniversalBlePlugin.kt

@@ -95,6 +95,10 @@ class UniversalBlePlugin : UniversalBlePlatformChannel, BluetoothGattCallback(),
         )
     }
 
+    override fun hasPermissions(withAndroidFineLocation: Boolean): Boolean {
+        return permissionHandler?.hasPermissions(withAndroidFineLocation) ?: false
+    }
+
     override fun requestPermissions(
         withAndroidFineLocation: Boolean,
         callback: (Result<Unit>) -> Unit,