initial setup of google auth sign-in

Author: russellwheatley

FirebaseSwiftUI/FirebaseAuthSwiftUI/Sources/Services/AuthService.swift

@@ -3,6 +3,7 @@ import SwiftUI
 
 public protocol GoogleProviderProtocol {
   func handleUrl(_ url: URL) -> Bool
+  func signInWithGoogle(clientID: String)
 }
 
 public enum AuthenticationProvider {
@@ -100,6 +101,23 @@ public final class AuthService {
     updateAuthenticationState()
   }
 
+  public func signInWithGoogle() async throws {
+    authenticationState = .authenticating
+    do {
+      guard let clientID = auth.app?.options.clientID else { throw NSError(
+        domain: "AuthServiceErrorDomain",
+        code: 2,
+        userInfo: [
+          NSLocalizedDescriptionKey: "OAuth client ID not found. Please make sure Google Sign-In is enabled in the Firebase console. You may have to download a new GoogleService-Info.plist file after enabling Google Sign-In.",
+        ]
+      ) }
+      try safeGoogleProvider.signInWithGoogle(clientID: clientID)
+    } catch {
+      authenticationState = .unauthenticated
+      throw error
+    }
+  }
+
   func signIn(with credentials: AuthCredential) async throws {
     authenticationState = .authenticating
     do {

FirebaseSwiftUI/FirebaseAuthSwiftUI/Sources/Utils/StringUtils.swift

@@ -13,8 +13,9 @@ let kAccountDisabledError = "AccountDisabledError"
 let kEmailsDoNotMatchError = "EmailsDoNotMatchError"
 let kUnknownError = "UnknownError"
 
-class StringUtils {
-  static func localizedString(forKey key: String, configuration: AuthConfiguration) -> String {
+public class StringUtils {
+  public static func localizedString(forKey key: String,
+                                     configuration: AuthConfiguration) -> String {
     if let customStringsBundle = configuration.customStringsBundle {
       let localizedString = customStringsBundle.localizedString(
         forKey: key,
@@ -30,7 +31,8 @@ class StringUtils {
     return Bundle.module.localizedString(forKey: key, value: nil, table: nil)
   }
 
-  static func localizedErrorMessage(for error: Error, configuration: AuthConfiguration) -> String {
+  public static func localizedErrorMessage(for error: Error,
+                                           configuration: AuthConfiguration) -> String {
     let authError = error as NSError
     let errorCode = AuthErrorCode(rawValue: authError.code)
     switch errorCode {

…ces/Services/FirebaseGoogleSwiftUI.swift …urces/Services/GoogleProviderSwift.swiftFirebaseSwiftUI/FirebaseGoogleSwiftUI/Sources/Services/FirebaseGoogleSwiftUI.swift renamed to FirebaseSwiftUI/FirebaseGoogleSwiftUI/Sources/Services/GoogleProviderSwift.swift FirebaseSwiftUI/FirebaseGoogleSwiftUI/Sources/Services/FirebaseGoogleSwiftUI.swift renamed to FirebaseSwiftUI/FirebaseGoogleSwiftUI/Sources/Services/GoogleProviderSwift.swift

@@ -6,7 +6,7 @@ let kGoogleUserInfoEmailScope = "https://www.googleapis.com/auth/userinfo.email"
 let kGoogleUserInfoProfileScope = "https://www.googleapis.com/auth/userinfo.profile"
 let kDefaultScopes = [kGoogleUserInfoEmailScope, kGoogleUserInfoProfileScope]
 
-public class GoogleProviderSwift: GoogleProviderProtocol {
+public class GoogleProviderSwift: @preconcurrency GoogleProviderProtocol {
   let scopes: [String]
   let shortName = "Google"
   let providerId = "google.com"
@@ -45,7 +45,6 @@ public class GoogleProviderSwift: GoogleProviderProtocol {
       let credential = GoogleAuthProvider.credential(withIDToken: idToken,
                                                      accessToken: user.accessToken
                                                        .tokenString)
-
     }
   }
 }

FirebaseSwiftUI/FirebaseGoogleSwiftUI/Sources/Views/GoogleButtonView.swift

@@ -0,0 +1,43 @@
+import FirebaseAuthSwiftUI
+import SwiftUI
+
+@MainActor
+public struct GoogleButtonView {
+  @Environment(AuthService.self) private var authService
+  @State private var errorMessage = ""
+
+  public init() {}
+
+  private func signInWithGoogle() async {
+    do {
+      try await authService.signInWithGoogle()
+    } catch {
+      errorMessage = StringUtils.localizedErrorMessage(
+        for: error,
+        configuration: authService.configuration
+      )
+    }
+  }
+}
+
+extension GoogleButtonView: View {
+  public var body: some View {
+    Button(action: {
+      Task {
+        try await signInWithGoogle()
+      }
+    }) {
+      if authService.authenticationState != .authenticating {
+        Text(authService.authenticationFlow == .login ? "Login with Google" : "Sign-up with Google")
+          .padding(.vertical, 8)
+          .frame(maxWidth: .infinity)
+      } else {
+        ProgressView()
+          .progressViewStyle(CircularProgressViewStyle(tint: .white))
+          .padding(.vertical, 8)
+          .frame(maxWidth: .infinity)
+      }
+    }
+    Text(errorMessage)
+  }
+}

samples/swiftui/FirebaseSwiftUIExample/FirebaseSwiftUIExample/FirebaseSwiftUIExampleApp.swift

@@ -48,7 +48,7 @@ struct ContentView: View {
 
   var body: some View {
     AuthPickerView {
-      Text("GOOGLE AUTH BUTTON")
+      GoogleButtonView()
     }.environment(authService)
   }
 }