push notification services

src/Android/Services/AndroidPushNotificationService.cs

@@ -0,0 +1,50 @@
+#if !FDROID
+using System;
+using System.Threading.Tasks;
+using Bit.App.Abstractions;
+using Bit.Core;
+using Bit.Core.Abstractions;
+using Xamarin.Forms;
+
+namespace Bit.Droid.Services
+{
+    public class AndroidPushNotificationService : IPushNotificationService
+    {
+        private readonly IStorageService _storageService;
+        private readonly IPushNotificationListenerService _pushNotificationListenerService;
+
+        public AndroidPushNotificationService(
+            IStorageService storageService,
+            IPushNotificationListenerService pushNotificationListenerService)
+        {
+            _storageService = storageService;
+            _pushNotificationListenerService = pushNotificationListenerService;
+        }
+
+        public async Task<string> GetTokenAsync()
+        {
+            return await _storageService.GetAsync<string>(Constants.PushCurrentTokenKey);
+        }
+
+        public async Task RegisterAsync()
+        {
+            var registeredToken = await _storageService.GetAsync<string>(Constants.PushRegisteredTokenKey);
+            var currentToken = await GetTokenAsync();
+            if(!string.IsNullOrWhiteSpace(registeredToken) && registeredToken != currentToken)
+            {
+                await _pushNotificationListenerService.OnRegisteredAsync(registeredToken, Device.Android);
+            }
+            else
+            {
+                await _storageService.SaveAsync(Constants.PushLastRegistrationDateKey, DateTime.UtcNow);
+            }
+        }
+
+        public Task UnregisterAsync()
+        {
+            // Do we ever need to unregister?
+            return Task.FromResult(0);
+        }
+    }
+}
+#endif