How to dynamically save token after logging to shared prefernces - flutter

Question

How to dynamically auth users and save tokens in shared pref?
I understood how to save token in sharedprefernces, but can't understand how to take it dynamically by login/password and pass token from it to sharedpref dynamically in loginWithToken(); beacuse I use this function for auth in
final httpConnectionOptions = HttpConnectionOptions(
accessTokenFactory: () => SharedPreferenceService().loginWithToken(),
and it is required only String
My code now is like that:
Here is request where I am making request to get token:
Future<String?> getToken(String password, String login) async {
String _email = "admin";
String _password = "123";
Map<String, String> headers = {
'Content-Type': 'application/json',
'accept': ' */*'
};
final body = {
'username': _email,
'password': _password,
};
var response = await http.post(
Uri.parse("http://mylink/login"),
headers: headers,
body: jsonEncode(body),
);
if (response.statusCode == 200) {
var value = jsonEncode(response.body);
return value;
}
return null;
}
here is I created logging logic:
final TextEditingController _loginController = TextEditingController();
final TextEditingController _passwordController = TextEditingController();
ElevatedButton(
onPressed: () async {
var username = _loginController.text;
var password = _passwordController.text;
var jwt = await ProviderService()
.getToken(password, username);
if (jwt != null) {
SharedPreferenceService().setToken(jwt);
Navigator.pushNamed(
context, '/mainPageAdmin');
} else {
displayDialog(context);
}
},
here is my shared pref. I can't understand how to put new token value in that string, after paaword and login was sent.
String tokens = 'dhjwhdwdwkjdhdkje';
Future<bool> getSharedPreferencesInstance() async {
_prefs = await SharedPreferences.getInstance().catchError((e) {
print("shared preferences error : $e");
return false;
});
return true;
}
Future setToken(String token) async {
await _prefs?.setString('token', token);
}
Future clearToken() async {
await _prefs?.clear();
}
Future<String> get token async => _prefs?.getString('token') ?? '';
Future<String> loginWithToken() async {
bool value = await getSharedPreferencesInstance();
if (value == true) {
setToken("Bearer $tokens");
// print(tokens);
}
return tokens;
}
Api Responce:
{
"$id": "1",
"token": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJodHRwOi8vc2NoZW1hcy54bWxzb2FwLm9yZ",
"user": {
"$id": "2"
}
}
Auth class I parsed:
Auth authFromJson(String str) => Auth.fromJson(json.decode(str));
String authToJson(Auth data) => json.encode(data.toJson());
class Auth {
Auth({
this.token,
this.user,
});
final String? token;
final User? user;
factory Auth.fromJson(Map<String, dynamic> json) => Auth(
token: json["token"],
user: User.fromJson(json["user"]),
);
Map<String, dynamic> toJson() => {
"token": token,
"user": user!.toJson(),
};
}

Answer 1

In your getToken function do this:
if (response.statusCode == 200) {
var value = jsonEncode(response.body) as Map<String, dynamic>;
await setToken(value['token']);
return value;
}