iOS Firebase Twitter Login asks for Permission Every Time - swift

Question

I am able to create an account and login via Twitter; however, with each login attempt the user is taken to a Twitter web page where they have to login with their credentials. Given this happens every time, it negates the value of this kind of social login. I have Facebook and Google logins working without this issue on Firebase. Below is the code used to login:
private func loginWithTwitter() {
TWTRTwitter.sharedInstance().logIn { (session, error) in
guard error == nil && session != nil else {
self.spinner.dismiss()
Utilities.displayAlert(title: "Login Error", msg: error?.localizedDescription ?? "Could not login with Twitter at this time.", controller: self)
return
}
let credential = TwitterAuthProvider.credential(withToken: session!.authToken, secret: session!.authTokenSecret)
Auth.auth().signInAndRetrieveData(with: credential, completion: { (result, error) in
if let error = error {
self.spinner.dismiss()
self.present(self.sharedManager.getAlertWith(title: "Login Error", andMsg: error.localizedDescription), animated: true)
return
}
self.loadUserInfo()
})
}
}
I should also add that I do have the use for logins box checked on the Twitter Developers page.
UPDATE:
Based on the post of Pratik below and here is a modified version that does seem to work. However, I am not sure if it's the right long-term answer. I wonder about token expiration for example. Thoughts on if there is a better way than this?
private func loginWithTwitter() {
let token = TWTRTwitter.sharedInstance().sessionStore.session()?.authToken
let secret = TWTRTwitter.sharedInstance().sessionStore.session()?.authTokenSecret
guard token != nil && secret != nil else {
self.present(self.sharedManager.getAlertWith(title: "Login Error", andMsg: "Could not login with Twitter. Please try again."), animated: true)
return
}
let credential = TwitterAuthProvider.credential(withToken: token!, secret: secret!)
Auth.auth().signInAndRetrieveData(with: credential, completion: { (result, error) in
if let error = error {
self.spinner.dismiss()
self.present(self.sharedManager.getAlertWith(title: "Login Error", andMsg: error.localizedDescription), animated: true)
return
}
self.loadUserInfo()
})
}

Answer 1

I'm not sure with will help or not, but im using twitter login in my app and once i authenticate with twitter i used below function to when user open app again for validation.
func silentLoginWithTwitter()
{
let client = TWTRAPIClient.withCurrentUser()
let request = client.urlRequest(withMethod: "GET", urlString: "https://api.twitter.com/1.1/account/verify_credentials.json", parameters: ["include_email": "true", "skip_status": "true"], error: nil)
client.sendTwitterRequest(request, completion: { (response:URLResponse?, data:Data?, error:Error?) in
if error == nil
{
// Open main page of application
}else
{
print("Error: Twitter : \(String(describing: error))")
// Open Login page again
}
})
}
OR you can check session auth
if let authSession = TWTRTwitter.sharedInstance().sessionStore.session()?.authToken {
TWTRTwitter.sharedInstance().sessionStore.isValidOauthToken(authSession)
}
Hope this will help