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EvolverSwiftUI/SignInWithGoogleHelper.swift

Forked from SwiftfulThinking/SignInWithGoogleHelper.swift
Created March 25, 2023 12:03
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Revisions

  1. @SwiftfulThinking SwiftfulThinking revised this gist Jan 8, 2023. No changes.
  2. @SwiftfulThinking SwiftfulThinking created this gist Jan 8, 2023.
    46 changes: 46 additions & 0 deletions SignInWithGoogleHelper.swift
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,46 @@
    import SwiftUI
    import GoogleSignIn
    import GoogleSignInSwift

    struct GoogleSignInResult {
    let idToken: String
    let accessToken: String
    }

    final class SignInWithGoogleHelper {

    @MainActor
    func signIn(viewController: UIViewController? = nil) async throws -> GoogleSignInResult {
    guard let topViewController = viewController ?? topViewController() else {
    throw URLError(.notConnectedToInternet)
    }

    let gidSignInResult = try await GIDSignIn.sharedInstance.signIn(withPresenting: topViewController)

    guard let idToken = gidSignInResult.user.idToken?.tokenString else {
    throw URLError(.badServerResponse)
    }

    let accessToken = gidSignInResult.user.accessToken.tokenString
    return GoogleSignInResult(idToken: idToken, accessToken: accessToken)
    }

    @MainActor
    func topViewController(controller: UIViewController? = nil) -> UIViewController? {
    let controller = controller ?? UIApplication.shared.keyWindow?.rootViewController

    if let navigationController = controller as? UINavigationController {
    return topViewController(controller: navigationController.visibleViewController)
    }
    if let tabController = controller as? UITabBarController {
    if let selected = tabController.selectedViewController {
    return topViewController(controller: selected)
    }
    }
    if let presented = controller?.presentedViewController {
    return topViewController(controller: presented)
    }
    return controller
    }

    }