Update AuthSessionStore.swift

nirvana-ios/Auth/AuthSessionStore.swift

@@ -9,6 +9,7 @@ import Foundation
 import Firebase
 import Combine
 import FirebaseAuth
+import GoogleSignIn
 
 enum SessionState {
     case isAuthenticated
@@ -22,24 +23,81 @@ protocol SessionStore {
     func signInOrCreateUser()
     func logOut()
     func unbind()
+    func setupAuthListen()
 }
 
 final class AuthSessionStore: ObservableObject, SessionStore {
     @Published var user : User?
     @Published var sessionState: SessionState = SessionState.isLoggedOut
     
+    private var GIDconfig:GIDConfiguration
+    
     private var handler: AuthStateDidChangeListenerHandle?
     
     init() {
+        // create google sign in configuration object
+        let clientID = FirebaseApp.app()?.options.clientID
+        self.GIDconfig = GIDConfiguration(clientID: clientID!)
+        
         self.setupAuthListen()
     }
     
     func signInOrCreateUser() {
-        
+        if GIDSignIn.sharedInstance.currentUser == nil {
+            guard
+                let viewController = UIApplication.shared.windows.first!.rootViewController
+            else {
+                return
+            }
+            
+            GIDSignIn.sharedInstance.signIn(with: self.GIDconfig, presenting: viewController)
+                {[self] user, err in
+                    
+                    if err != nil {
+                        print(err!.localizedDescription)
+                        return
+                    }
+                    
+                    guard
+                      let authentication = user?.authentication,
+                      let idToken = authentication.idToken
+                    else {
+                      return
+                    }
+
+                    let credential = GoogleAuthProvider.credential(withIDToken: idToken,
+                                                                   accessToken: authentication.accessToken)
+                    
+                    // sign in with firebase
+                    self.firebaseAuth(withCredentials: credential)
+                }
+        }
+    }
+    
+    func firebaseAuth(withCredentials authCred: AuthCredential) {
+        Auth.auth().signIn(with: authCred) { result, error in
+            if error != nil {
+                print(error!.localizedDescription)
+            }
+            
+            guard let user = result?.user else {
+                return
+            }
+            
+            // User is signed in
+            print(user.displayName ?? "Success!")
+            print(user)
+        }
     }
     
     func logOut() {
-        try? Auth.auth().signOut()
+         let firebaseAuth = Auth.auth()
+        
+         do {
+           try firebaseAuth.signOut()
+         } catch let signOutError as NSError {
+           print("Error signing out: %@", signOutError)
+         }
     }
     
     func unbind () {
@@ -47,12 +105,12 @@ final class AuthSessionStore: ObservableObject, SessionStore {
             Auth.auth().removeStateDidChangeListener(handle)
         }
     }
-}
-
-private extension AuthSessionStore {
+    
     func setupAuthListen() {
         // monitor authentication changes using firebase
         self.handler = Auth.auth().addStateDidChangeListener { (auth, user) in
+            print("auth listener activated")
+            
             if let user = user {
                 // if we have a user, create a new user model
                 print("Got user: \(user)")
@@ -65,3 +123,16 @@ private extension AuthSessionStore {
         }
     }
 }
+
+extension UIApplication {
+  func getRootViewController() -> UIViewController {
+      guard let screen = UIApplication.shared.connectedScenes.first as? UIWindowScene else { return .init() }
+      
+      guard let root = screen.windows.first?.rootViewController else {
+          return .init()
+      }
+      
+      return root
+  }
+
+}