Generate push token

data-sources/firebase-data.js

@@ -216,6 +216,21 @@ export function updateProfile(user: User): Promise {
     });
 }
 
+/**
+ * Saves the push notification token to firestore.  The token is needed to 
+ * send push notifications to users.
+ * @param {string} token - the push token generated by the user's phone
+ * @param {User} user - the current user object
+ * @returns {Promise<any>} - Promise
+ */
+export function setUserPushToken(token: string, user: User) {
+    const data = deconstruct(user);
+    return db.collection('users').doc(user.uid).update({
+        pushToken: token,
+        updated: firebase.firestore.FieldValue.serverTimestamp()
+    });
+}
+
 /**
  *
  * @param {string} uid - user id

libs/pushTokens.js

@@ -0,0 +1,50 @@
+import { Notifications } from 'expo';
+import * as Permissions from 'expo-permissions';
+import {Alert} from 'react-native';
+
+const PUSH_ENDPOINT = 'https://your-server.com/users/push-token';
+
+export default async function registerForPushNotificationsAsync() {
+  const { status: existingStatus } = await Permissions.getAsync(
+    Permissions.NOTIFICATIONS
+  );
+  let finalStatus = existingStatus;
+
+  // only ask if permissions have not already been determined, because
+  // iOS won't necessarily prompt the user a second time.
+  if (existingStatus !== 'granted') {
+    // Android remote notification permissions are granted during the app
+    // install, so this will only ask on iOS
+    const { status } = await Permissions.askAsync(Permissions.NOTIFICATIONS);
+    finalStatus = status;
+  }
+
+  // Stop here if the user did not grant permissions
+  if (finalStatus !== 'granted') {
+    return;
+  }
+
+  // Get the token that uniquely identifies this device
+  let token = await Notifications.getExpoPushTokenAsync();
+
+  // lets see if we can display it as an alert...
+  Alert.alert('Push Token', token);
+
+
+  // POST the token to your backend server from where you can retrieve it to send push notifications.
+//   return fetch(PUSH_ENDPOINT, {
+//     method: 'POST',
+//     headers: {
+//       Accept: 'application/json',
+//       'Content-Type': 'application/json',
+//     },
+//     body: JSON.stringify({
+//       token: {
+//         value: token,
+//       },
+//       user: {
+//         username: 'Brent',
+//       },
+//     }),
+//   });
+}

screens/dashboard/index.js

@@ -27,6 +27,7 @@ import commonStyles from '../../styles/common';
 import MoneyMeter from '../../components/money-meter';
 import MenuCircle from '../../components/menu-circle';
 import GoalsBox from '../../components/goals-box';
+import getPushToken from '../../libs/pushTokens'
 
 import pkg from '../../package.json';
 
@@ -84,6 +85,10 @@ class Dashboard extends Component<PropsType> {
         }
     }
 
+    pushTokenAlert() {
+        getPushToken()
+    }
+
     ellipsisLogoutAlert() {
         const logoutCallback = this.props.actions.logout;
 
@@ -162,7 +167,7 @@ class Dashboard extends Component<PropsType> {
                             }}
                         >
                             <TouchableHighlight
-                                onPress={() => this.ellipsisLogoutAlert()}
+                                onPress={() => this.pushTokenAlert()}
                                 underlayColor='transparent'
                                 style={{
                                     width: 300,