Bookstore App

To learn more about this example, visit the Bookstore App page.

To start with this app you need to register your Flutter App to a Firebase project.

You can follow the respective Firebase setup guide for Android and iOS setup.

These are the Firebase Authentication methods which we have used to authenticate the user in our app:

import 'package:api_sdk/models/user.dart';
import 'package:firebase_auth/firebase_auth.dart';

class AuthService {
  final FirebaseAuth _auth = FirebaseAuth.instance;
  String errorMessage;

  //Create User Object from Firebase User
  User _userFromFirebaseUser(FirebaseUser user, token) {
    return user != null
        ? User(uid: user.uid, email: user.email, token: token)
        : null;
  }

  //Signin With email and password
  Future signInWithEmailAndPassword(String email, String password) async {
    try {
      AuthResult userCredential = await _auth.signInWithEmailAndPassword(
          email: email, password: password);
      final res = await userCredential.user.getIdToken();
      return _userFromFirebaseUser(userCredential.user, res.token);
    } catch (err) {
      //getMessageFromErrorCode is a custom function which returns error message for a particular error code.
      errorMessage = getMessageFromErrorCode(err.code);
      return Future.error(errorMessage);
    }
  }

  //Register with email and password
  Future registerWithEmailAndPassword(String email, String password) async {
    try {
      AuthResult userCredential = await _auth.createUserWithEmailAndPassword(
          email: email, password: password);
      final res = await userCredential.user.getIdToken();
      return _userFromFirebaseUser(userCredential.user, res.token);
    } catch (err) {
      //getMessageFromErrorCode is a custom function which returns error message for a particular error code.
      errorMessage = getMessageFromErrorCode(err.code);
      return Future.error(errorMessage);
    }
  }

  //Get Current User 
  Future getCurrentUser() async {
    try {
      final FirebaseUser user = await _auth.currentUser();
      final res = await user.getIdToken();
      return _userFromFirebaseUser(user, res.token);
    } catch (err) {
      return null;
    }
  }

  //Signout
  Future<void> signOut() async {
    return await _auth.signOut();
  }

}

We have used the following code for firestore collection management:

import 'package:cloud_firestore/cloud_firestore.dart';

class FirebaseApi {
  final Firestore _db = Firestore.instance;
  final String path;
  CollectionReference ref;

  FirebaseApi(this.path) {
    ref = _db.collection(path);
  }

  Future<QuerySnapshot> getDataCollection() {
    return ref.getDocuments();
  }

  Stream<QuerySnapshot> streamDataCollection() {
    return ref.snapshots();
  }

  Future<DocumentSnapshot> getDocumentById(String id) {
    return ref.document(id).get();
  }

  Future<void> removeDocument(String id) {
    return ref.document(id).delete();
  }

  Future<DocumentReference> addDocument(Map data) {
    return ref.add(data);
  }

  Future<void> updateDocument(Map data, String id) {
    return ref.document(id).updateData(data);
  }
}

The methods defined in above code snippets will be called in Shared folder.

Your app should look like this: