How to authorize user with Google in OS X Cocoa application

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I am using Firebase in my OS X application. I am trying to add Google Authentication. This is an example for iOS.

Question is: How to obtain Google OAuth access token in OS X application?

firebase google-authentication macos objective-c cocoa
3 Answers

UPDATED

Updated code for recent versions of Firebase. Signing in with Google (using OAuth) to authenticate with Firebase. 

func someFunc {
    let frameworkBundle = Bundle(for: GTMOAuth2WindowController.self)
    let windowController = GTMOAuth2WindowController(scope: "https://www.googleapis.com/auth/plus.me", clientID: YOUR_CLIENT_ID, clientSecret: YOUR_CLIENT_SECRET, keychainItemName: "OAuth2 APP_NAME: Google+", resourceBundle: frameworkBundle)

    guard let window = self.view.window else { return }

    windowController?.signInSheetModal(for: window, delegate: self, finishedSelector: #selector(didFinishWithAuth(windowController:auth:error:)))
}

  @objc func didFinishWithAuth(windowController:GTMOAuth2WindowController, auth: GTMOAuth2Authentication, error: NSError?) {
    if error != nil {
      print(error?.localizedDescription ?? String())
    } else {

      let credential = OAuthProvider.credential(withProviderID: GoogleAuthProviderID, accessToken: auth.accessToken)

        Auth.auth().signIn(with: credential) { (auth, error) in
          if let error = error {
            print(error.localizedDescription)
            return
          }

          // Successful sign in
      }
    }
  }
user_137525550
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