Check if phone exists before signup/signin - Flutter Phone Authentication [duplicate] - firebase

Question

This question already exists:
Firebase Authentication using Phone number (Error: Missing Session Info)
Closed 2 years ago.
I want to check if phone exists before signing in or signing up a user. With email registration, I used the following and I was able to tell if an email exists or not.
final url =
'https://www.googleapis.com/identitytoolkit/v3/relyingparty/$verifyPassword?key={API_KEY}';
Similarly, for phone numbers, I used the following:
final url ='https://www.googleapis.com/identitytoolkit/v3/relyingparty/verifyPhoneNumber?key={API_KEY}';
final response = await http.post(
url,
body: json.encode(
{
'phoneNumber': number
},
),
);
However, I am getting the following error message:
Extracted data is {error: {code: 400, message: MISSING_SESSION_INFO, errors: [{message: MISSING_SESSION_INFO, domain: global, reason: invalid}]}}
I want to know why does it work for email but not for phone registration?
Also, is this the right way to check if a phone exists?
Here's my full code:
enum Status { Uninitialized, Authenticated, Authenticating, Unauthenticated }
class AuthProvider with ChangeNotifier {
FirebaseAuth _auth = FirebaseAuth.instance;
User _user;
Status _status = Status.Uninitialized;
TextEditingController phoneNo;
String smsOTP;
String verificationId;
String errorMessage = '';
bool logedIn = false;
bool loading = false;
Status get status => _status;
TextEditingController address = TextEditingController();
AuthProvider.initialize() {
readPrefs();
}
Future signOut() async {
_auth.signOut();
_status = Status.Unauthenticated;
notifyListeners();
return Future.delayed(Duration.zero);
}
Future<void> readPrefs() async {
await Future.delayed(Duration(seconds: 3)).then((v) async {
SharedPreferences prefs = await SharedPreferences.getInstance();
logedIn = prefs.getBool('logedIn') ?? false;
if (!logedIn) {
print('User is not logged in');
_status = Status.Unauthenticated;
} else {
print('User is logged in');
_user = _auth.currentUser;
_status = Status.Authenticated;
}
notifyListeners();
});
}
Future<void> verifyPhone(BuildContext context, String number,String password) async {
//To be used in the verifyPhone method
final PhoneCodeSent smsOTPSent = (String verId, [int forceCodeResend]) {
this.verificationId = verId;
smsOTPDialog(context, number,password).then((value) {
_status = Status.Authenticated;
});
};
try {
await _auth.verifyPhoneNumber(
phoneNumber: number.trim(),
codeAutoRetrievalTimeout: (String verId) {
//Starts the phone number verification process for the given phone number.
//Either sends an SMS with a 6 digit code to the phone number specified, or sign's the user in and [verificationCompleted] is called.
this.verificationId = verId;
},
codeSent: smsOTPSent,
// timeout: const Duration(seconds: 20),
//If user is automatically verified (without having to type the code)
verificationCompleted: (AuthCredential credential) async {
Navigator.of(context).pop();
UserCredential result =
await _auth.signInWithCredential(credential);
User user = result.user;
if (user != null) {
//TO DO:// Here you need to save the phone and password to DB
print('Adding user to DB');
final url = 'https://mobile-12.firebaseio.com/users/$number.json';
try {
await http.post(
url,
body: json.encode({
'password': password,
'phoneNumber':user.phoneNumber,
}),
);
_status = Status.Authenticated;
} catch (error) {
print(error);
}
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => HomeScreen(
)));
} else {
print("Error");
}
},
verificationFailed: (FirebaseAuthException exceptio) {
print('${exceptio.message} + something is wrong');
});
} catch (e) {
handleError(e, context,number,password);
errorMessage = e.toString();
notifyListeners();
}
notifyListeners();
}
Future<bool> smsOTPDialog(BuildContext context,String number,String password) {
return showDialog(
context: context,
barrierDismissible: false,
builder: (BuildContext context) {
return AlertDialog(
title: Text('Enter SMS Code'),
content: Container(
height: 85,
child: Column(children: [
TextField(
onChanged: (value) {
this.smsOTP = value;
},
),
(errorMessage != ''
? Text(
errorMessage,
style: TextStyle(color: Colors.red),
)
: Container())
]),
),
contentPadding: EdgeInsets.all(10),
actions: <Widget>[
FlatButton(
child: Text("Confirm"),
textColor: Colors.white,
color: Colors.blue,
onPressed: () async {
final code = this.smsOTP.trim();
AuthCredential credential = PhoneAuthProvider.credential(
verificationId: verificationId, smsCode: code);
UserCredential result =
await _auth.signInWithCredential(credential);
User user = result.user;
if (user != null) {
print('user already exist');
// //TO DO:// Save the phone number and password to DB
print('Adding user to Db in the manual OTP route');
final url = 'https://mobile-12.firebaseio.com/users/$number.json';
try {
await http.post(
url,
body: json.encode({
'password': password,
'phoneNumber':user.phoneNumber,
}),
);
} catch (error) {
print('INSIDE ERROR');
print(error);
}
SharedPreferences prefs = await SharedPreferences.getInstance();
prefs.setBool("logedIn", true);
logedIn = true;
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => HomeScreen(
)));
loading = false;
notifyListeners();
} else {
print("No OTP was added");
loading = true;
notifyListeners();
Navigator.of(context).pop();
}
},
)
],
);
});
}
//Sign-In Method checks to see if a phone exists.
signIn(BuildContext context, String number, String password,AuthMode authMode) async {
try {
//Check to see if the phone number is available
final url = 'https://www.googleapis.com/identitytoolkit/v3/relyingparty/verifyPhoneNumber?key=';
final response = await http.post(
url,
body: json.encode(
{
'phoneNumber': number
},
),
);
final extractedData = json.decode(response.body) as Map<String, dynamic>;
print('Extracted data is ' + extractedData.toString());
//Register and send OTP if new user
if (extractedData == null && authMode == AuthMode.Signup) {
print('Inside NULL no errors');
// //Verify phone
verifyPhone(context, number, password);
}
//If tries to login but phone not available
else if(extractedData == null && authMode == AuthMode.Login)
{
_showErrorDialog('Phone number does not exist. Please Sign Up', context);
}
else if (extractedData['error'] != null) {
_showErrorDialog('Something went wrong! Please try again!', context);
}
//If someone signup but their phone already exist
else if(extractedData != null && authMode == AuthMode.Signup)
{
_showErrorDialog('Your phone already exists. Please Login!', context);
}
//If available, proceed to homepage
else {
print('User found');
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => HomeScreen(
)));
}
} catch (e) {
handleError(e, context,number,password);
}
}
handleError(error, BuildContext context,String number,String password) {
errorMessage = error.toString();
print('ERROR IS ' + errorMessage);
notifyListeners();
}
Future<bool> _showErrorDialog(String message,BuildContext context) {
return showDialog(
context: context,
builder: (ctx) => AlertDialog(
title: Text('An Error Occurred!'),
content: Text(message),
actions: <Widget>[
FlatButton(
child: Text('Okay'),
onPressed: () {
Navigator.of(ctx).pop();
},
)
],
),
);
}
}