Notifications + AsyncStorage

lib/asyncStorage.ts

@@ -0,0 +1,15 @@
+import AsyncStorage from '@react-native-async-storage/async-storage';
+
+const notificationKey = (aId: string) => `assignment_notification_${aId}`;
+
+export async function SaveAssignmentNotificationId(aId: string, notificationId: string) {
+  await AsyncStorage.setItem(notificationKey(aId), notificationId);
+}
+
+export async function GetAssignmentNotificationId(aId: string) {
+  return await AsyncStorage.getItem(notificationKey(aId));
+}
+
+export async function RemoveAssignmentNotificationId(aId: string) {
+  await AsyncStorage.removeItem(notificationKey(aId));
+}

lib/notifications.ts

@@ -0,0 +1,39 @@
+import * as Notifications from 'expo-notifications';
+import { Platform } from 'react-native';
+
+Notifications.setNotificationHandler({
+  handleNotification: async () => ({
+    shouldPlaySound: true,
+    shouldSetBadge: true,
+    shouldShowBanner: true,
+    shouldShowList: true,
+  }),
+});
+
+function HandleRegistrationError(errorMessage: string) {
+  alert(errorMessage);
+  throw new Error(errorMessage);
+}
+
+export async function RegisterForLocalNotificationsAsync() {
+  if (Platform.OS === 'android') {
+    await Notifications.setNotificationChannelAsync('default', {
+      name: 'default',
+      importance: Notifications.AndroidImportance.MAX
+    });
+  }
+
+  const { status: existingStatus } = await Notifications.getPermissionsAsync();
+
+  let finalStatus = existingStatus;
+
+  if (existingStatus !== 'granted') {
+    const { status } = await Notifications.requestPermissionsAsync();
+    finalStatus = status;
+  }
+
+  if (finalStatus !== 'granted') {
+      HandleRegistrationError('Permission not granted for local notifications');
+      return;
+  }
+}