Angular4 Firebase authentication service using OAuth, Anonymous, and Email/Password. Designed specifically for changes introduced in AngularFire2 4.0.0

auth.service.ts

import { Injectable } from '@angular/core';
import { AngularFireDatabaseModule, AngularFireDatabase, FirebaseListObservable } from 'angularfire2/database';
import { AngularFireAuth } from 'angularfire2/auth';
import { Router } from "@angular/router";
import * as firebase from 'firebase';


@Injectable()
export class AuthService {

  authState: any = null;

  constructor(private afAuth: AngularFireAuth,
              private db: AngularFireDatabase,
              private router:Router) {

            this.afAuth.authState.subscribe((auth) => {
              this.authState = auth
            });
          }

  // Returns true if user is logged in
  get authenticated(): boolean {
    return this.authState !== null;
  }

  // Returns current user data
  get currentUser(): any {
    return this.authenticated ? this.authState : null;
  }

  // Returns
  get currentUserObservable(): any {
    return this.afAuth.authState
  }

  // Returns current user UID
  get currentUserId(): string {
    return this.authenticated ? this.authState.uid : '';
  }

  // Anonymous User
  get currentUserAnonymous(): boolean {
    return this.authenticated ? this.authState.isAnonymous : false
  }

  // Returns current user display name or Guest
  get currentUserDisplayName(): string {
    if (!this.authState) { return 'Guest' }
    else if (this.currentUserAnonymous) { return 'Anonymous' }
    else { return this.authState['displayName'] || 'User without a Name' }
  }

  //// Social Auth ////

  githubLogin() {
    const provider = new firebase.auth.GithubAuthProvider()
    return this.socialSignIn(provider);
  }

  googleLogin() {
    const provider = new firebase.auth.GoogleAuthProvider()
    return this.socialSignIn(provider);
  }

  facebookLogin() {
    const provider = new firebase.auth.FacebookAuthProvider()
    return this.socialSignIn(provider);
  }

  twitterLogin(){
    const provider = new firebase.auth.TwitterAuthProvider()
    return this.socialSignIn(provider);
  }

  private socialSignIn(provider) {
    return this.afAuth.auth.signInWithPopup(provider)
      .then((credential) =>  {
          this.authState = credential.user
          this.updateUserData()
      })
      .catch(error => console.log(error));
  }


  //// Anonymous Auth ////

  anonymousLogin() {
    return this.afAuth.auth.signInAnonymously()
    .then((user) => {
      this.authState = user
      this.updateUserData()
    })
    .catch(error => console.log(error));
  }

  //// Email/Password Auth ////

  emailSignUp(email:string, password:string) {
    return this.afAuth.auth.createUserWithEmailAndPassword(email, password)
      .then((user) => {
        this.authState = user
        this.updateUserData()
      })
      .catch(error => console.log(error));
  }

  emailLogin(email:string, password:string) {
     return this.afAuth.auth.signInWithEmailAndPassword(email, password)
       .then((user) => {
         this.authState = user
         this.updateUserData()
       })
       .catch(error => console.log(error));
  }

  // Sends email allowing user to reset password
  resetPassword(email: string) {
    var auth = firebase.auth();

    return auth.sendPasswordResetEmail(email)
      .then(() => console.log("email sent"))
      .catch((error) => console.log(error))
  }


  //// Sign Out ////

  signOut(): void {
    this.afAuth.auth.signOut();
    this.router.navigate(['/'])
  }


  //// Helpers ////

  private updateUserData(): void {
  // Writes user name and email to realtime db
  // useful if your app displays information about users or for admin features

    let path = `users/${this.currentUserId}`; // Endpoint on firebase
    let data = {
                  email: this.authState.email,
                  name: this.authState.displayName
                }

    this.db.object(path).update(data)
    .catch(error => console.log(error));

  }




}

Hi - I'm trying to adapt this code but it doesn't completely make sense - you keep referencing 'this.authenticated' but 'authenticated' is never actually declared within auth.service.ts. Using the same code in my project brings up an error:
Property 'authenticated' does not exist on type 'AuthService'.

Is there a reason for this? Is it something that has been omitted on purpose, or by design?

Just saw your comment. It is defined as a typescript getter at line 24. You should not be getting an error...

get authenticated(): boolean {
    return this.authState !== null;
  }

Hi @codediodeio,

Please help me knowing how recover Location/Home Location from 19 LOC. (this.authState = auth). I can find all the details like

• Display Name
• Email ID
• UID number
• Phone number

Is there something I need to set in the social account ( facebook, google) for this or any specific key I need to look at in the this.authState object ?

How I can bind errors to my dom?

pls, how do I store a users display name when using createUserWithEmailAndPassword? thanks in advance

Do we get a token after authentication?

currentUserToken(): any { return firebase.auth().currentUser.getIdToken(false).then(idToken => { return localStorage.setItem('userToken', idToken); }).catch(error => { return error; }) }

Hi -- Please note that 'FirebaseListObservable' throws the following error: Module "module" has no exported member 'FirebaseListObservable'

Can you make the code work beyond firebase@4.12.1? Importing the full package from the 'firebase' gets a runtime warning, but all my attempts to import from 'firebase/app' and 'firebase/auth' failed.